Patent application number | Description | Published |
20080225061 | ELECTRONIC DEVICE, DISPLAY DEVICE, AND SEMICONDUCTOR DEVICE AND METHOD FOR DRIVING THE SAME - A pixel having a transistor which controls a current value supplied to a load, a first storage capacitor, a second storage capacitor, and first to fourth switches is included. After the threshold voltage of the transistor is held in the second storage capacitor, a potential in accordance with a video signal is input to the pixel. Voltage obtained by adding a potential in which the potential in accordance with the video signal and the first storage capacitor are capacitively divided to the threshold voltage is held in the second storage capacitor in this manner, so that variation of a current value caused by variations in the threshold voltage of the transistor is suppressed. Thus, desired current can be supplied to the load such as a light-emitting element. In addition, a display device with little deviation from luminance specified by the video signal can be provided. | 09-18-2008 |
20080246035 | Semiconductor device and display appliance using the semiconductor device - In order to provide a semiconductor device having a circuit for operating normally even when the amplitude of a signal voltage is smaller than the amplitude of a power source voltage, a correcting circuit is provided before a digital circuit to be operated normally. As for a signal outputted from the correcting circuit, when a transistor in the objective digital circuit is required to be turned OFF, the correcting circuit outputs a corresponding signal, namely a first power source potential. At this time, the transistor is turned OFF. On the other hand, when the transistor is required to be turned ON, the correcting circuit outputs a first input potential. Consequently, the objective digital circuit is turned OFF when it is required to be in an OFF state while turned ON when it is required to be in an ON state. Thereby, the objective digital circuit can be normally operated. | 10-09-2008 |
20080246064 | Semiconductor device and electronic device using the same - To provide a semiconductor device which can detect low illuminance. A photoelectric conversion element, a diode-connected first transistor, and a second transistor are included. A gate of the first transistor is electrically connected to a gate of the second transistor. One of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor through the photoelectric conversion element. The other of the source and the drain of the first transistor is electrically connected to the other of the source and the drain of the second transistor. By using transistors which have different threshold voltages for the first transistor and the second transistor, a semiconductor device which can perform detecting of low illuminance can be obtained. | 10-09-2008 |
20080277707 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - It is an object of the invention to provide a digital circuit which can operate normally regardless of binary potentials of an input signal. A semiconductor device having a correcting unit and a logic unit wherein the correcting unit includes a capacitor, first and second switches, wherein the first electrode of the capacitor is connected to the input terminal and the second electrode of the capacitor is connected to the gate of the transistor in the logic circuit, wherein the first switch controls the connection between a gate and drain of the transistor and the second switch controls the potential to be supplied to the drain of the transistor is provided. | 11-13-2008 |
20080284312 | Semiconductor Device and Driving Method Thereof - In a light emitting device, a variation in intensity caused by varying a threshold value of a TFT for supplying a current to a light emitting element for each pixel becomes a burden to an improvement of an image quality of the light emitting device. A voltage equal to the threshold value of a TFT ( | 11-20-2008 |
20080284710 | SEMICONDUCTOR DEVICE AND DISPLAY DEVICE - A single-crystal semiconductor layer is separated from a single-crystal semiconductor substrate and is fixed to an insulating substrate to form a TFT over the insulating substrate. Then, a driver circuit is formed using the TFT. The TFT has excellent current characteristics because an active layer is almost in a single-crystal state. Accordingly, a small thin display device with low power consumption can be manufactured. Further, a controller and a shift register which is included in a source driver are operated at the same power supply voltage. Thus, power consumption can be reduced. | 11-20-2008 |
20080284768 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - In a period T | 11-20-2008 |
20080284929 | LIQUID CRYSTAL DISPLAY DEVICE - To improve viewing angle characteristics by varying voltage which is applied between liquid crystal elements. A liquid crystal display device in which one pixel is provided with three or more liquid crystal elements and the level of voltage which is applied is varied between the liquid crystal elements is varied. In order to vary the level of the voltage which is applied between the liquid crystal elements, an element which divides the applied voltage is provided. In order to vary the level of the applied voltage, a capacitor, a resistor, a transistor, or the like is used. Viewing angle characteristics can be improved by varying the level of the voltage which is applied between the liquid crystal elements. | 11-20-2008 |
20080284931 | LIQUID CRYSTAL DISPLAY DEVICE - To provide a display device in which a viewing angle characteristic is improved by providing a plurality of sub-pixels to one pixel. Alternatively, to provide a display device in which an aperture ratio is suppressed even when a plurality of sub-pixels is provided. A pixel including first sub-pixel, a second sub-pixel, and a third sub-pixel, a scanning line, a signal line, a first capacitor wiring, a second capacitor wiring and a third capacitor wiring are provided. Pixel electrodes each electrically connected to one electrode of the first to third capacitor elements, and the first to third capacitor wirings, respectively, are provided to the first to third sub-pixels electrodes, respectively. Potentials of the first capacitor wiring and the second capacitor wiring are changed and a potential of the third capacitor wiring is kept almost constant. | 11-20-2008 |
20080284934 | LIQUID CRYSTAL DISPLAY DEVICE - To reduce the number of components such as IC chips so that decrease in size and thickness of a display module and an electronic device on which the display module is mounted is achieved. Further, to reduce the number of components such as IC chips so that an inexpensive display module and an electronic device on which the display module is mounted are provided. An electronic device or a display module includes two display panels. One of the display panels (i.e., a peripheral portion of a display region of the one of the display panels) is provided with circuits which are necessary for operating the display panels or circuits which are necessary for an electronic device in which the display panels are incorporated. Then, the display panels or the electronic device in which the display panels are incorporated are/is driven by the circuits incorporated in the display panels. | 11-20-2008 |
20080291352 | DIGITAL CIRCUIT HAVING CORRECTING CIRCUIT AND ELECTRONIC APPARATUS THEREOF - Provided is a digital circuit ( | 11-27-2008 |
20080297628 | Defective pixel specifying method, defective pixel specifying system, image correcting method, and image correcting system - A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read. | 12-04-2008 |
20080297676 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 12-04-2008 |
20090002586 | LIQUID CRYSTAL DISPLAY DEVICE - The present invention has a pixel which includes a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 01-01-2009 |
20090002590 | Semiconductor device - It is an object to provide a semiconductor device which has a large size and operates at high speed. A top gate transistor which includes a semiconductor layer of single-crystal and a bottom gate transistor which includes a semiconductor layer of amorphous silicon (microcrystalline silicon) are formed over the same substrate. Then, gate electrodes of each transistor are formed with the same layer, and source and drain electrodes are also formed with the same layer. Thus, manufacturing steps are reduced. In other words, two types of transistors can be manufactured by adding only a few steps to the manufacturing process of a bottom gate transistor. | 01-01-2009 |
20090002591 | Liquid crystal display device - An object is to propose a method of manufacturing, with high mass productivity, liquid crystal display devices having thin film transistors with highly reliable electric characteristics. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 01-01-2009 |
20090009455 | LIQUID CRYSTAL DISPLAY DEVICE, DRIVING METHOD OF THE LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE EMPLOYING THE SAME DEVICE AND THE SAME METHOD - To provide a liquid crystal display device which can improve viewing angle characteristics and a driving method of the liquid crystal display device, and an electronic device including the liquid crystal display device. In a liquid crystal display device which performs display by aligning liquid crystal molecules at a tilt or radially at a tilt, one pixel is divided into a plurality of regions (sub-pixels) and a signal applied to each sub-pixel is made different every desired period. Alternatively, a signal applied to each sub-pixel is made different with respect to an adjacent pixel. To improve viewing angle characteristics by changing transmittance of the liquid crystal molecules every desired period in addition to improving the viewing angle characteristics of a viewer by making the liquid crystal molecules slanted to increase directions of alignment. | 01-08-2009 |
20090009677 | Liquid crystal display device - A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 01-08-2009 |
20090021299 | Semiconductor Device and Display Device Utilizing the Same - A source-drain voltage of one of two transistors connected in series becomes quite small in a set operation (write signal), thus the set operation is performed to the other transistor. In an output operation, two transistors operate as a multi-gate transistor, therefore, a current value can be small in the output operation. In other words, a current can be large in the set operation. Therefore, the set operation can be performed rapidly without being easily influenced by an intersection capacitance and a wiring resistance which are parasitic on a wiring and the like. Further, an influence of variations between adjacent ones can be small as one same transistor is used in the set operation and the output operation. | 01-22-2009 |
20090027083 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS HAVING THE SAME - With an offset circuit including transistors of the same conductivity type, offset of an input signal is performed. Then, the input signal after the offset is supplied to a logic circuit including transistors of the same conductivity type as that of the offset circuit, thereby H and L levels of the input signal can be shifted at the same time. Further, since the offset circuit and the logic circuit are formed using the transistors of the same conductivity type, a display device can be manufactured at a low cost. | 01-29-2009 |
20090027370 | Semiconductor Device - A shift register capable of supplying only a necessary clock signal to a necessary unit register with simple constitution. A semiconductor device is provided with a shift register in which a plurality of stages of unit registers is connected, in which the unit register comprises a flip-flop circuit, a first switch and a second switch, a first clock signal line is electrically connected to the flip-flop circuit through the first switch, a second clock signal line is electrically connected to the flip-flop circuit through the second switch, the first switch is controlled to be on/off by an output signal from the flip-flop circuit, and the second switch is controlled to be on/off by an input signal to the flip-flop circuit. | 01-29-2009 |
20090058509 | Booster Circuit, Semiconductor Device, and Electronic Apparatus - A conventional circuit requires a booster circuit for generating a voltage higher than an external power supply voltage, thus low power consumption is difficult to be achieved. In addition, a display device incorporating the aforementioned conventional switching element for booster circuit has problems in that the current load is increased and the power supply becomes unstable with a higher output current. The invention provides a booster circuit including a first transistor, a second transistor, a first capacitor element, a second capacitor element, a diode, and an inverter, wherein one electrode of the first transistor is maintained at a predetermined potential, the output of the inverter is connected to the gate electrode of the first transistor and one electrode of the second transistor through the second capacitor element, the input of the inverter is connected to the other electrode of the first transistor through the first capacitor element and connected to the gate electrode of the second transistor, and the diode is connected between the other electrode of the first transistor and the other electrode of the second transistor so as to be forwardly biased. | 03-05-2009 |
20090072907 | ELECTRIC CIRCUIT - As for a transistor, overlapped are factors such as a variation of a gate insulation film which occurs due to a difference of a manufacturing process and a substrate used and a variation of a crystalline state in a channel forming region and thereby, there occurs a variation of a threshold voltage and mobility of a transistor. | 03-19-2009 |
20090081816 | LIGHT EMITTING DEVICE AND PRODUCTION SYSTEM OF THE SAME - To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained. | 03-26-2009 |
20090134920 | Semiconductor Device - A semiconductor device in which a transistor can supply an accurate current to a load (EL pixel and signal line) without being influenced by variations is provided. | 05-28-2009 |
20090174631 | Semiconductor Device and Driving Method Thereof - A semiconductor device in which a signal current can be written quickly in a current source circuit of a current input type. A signal current is written after performing a pre-charge operation, thus the writing is performed quickly. In the pre-charge operation, a current is supplied to a plurality of circuits. The current size is set according to the number of the circuits to be supplied the current, which means the steady state can be obtained quickly. Note that a current may be supplied to a circuit other than the one to be input a signal in the pre-charge operation. | 07-09-2009 |
20090236496 | PHOTOELECTRIC CONVERSION DEVICE - Objects are to suppress reduction in current output from a photoelectric conversion device and to prevent ESD from occurring in the photoelectric conversion device without greatly increasing the number of steps for manufacturing the photoelectric conversion device. The photoelectric conversion device includes a photodiode generating current by light irradiation; an amplifier circuit including at least one MOS transistor for amplifying the current; and at least one diode which is connected in series with the photodiode in a path of the current generated in the photodiode or a path of the current amplified by at least one MOS transistor so that a bias direction of the diode is opposite to that of the photodiode. Each of the photodiode and the diode includes a stack of a plurality of semiconductor films. | 09-24-2009 |
20090283762 | SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD OF THE SAME - An object is to provide a semiconductor device with high aperture ratio or a manufacturing method thereof. Another object is to provide semiconductor device with low power consumption or a manufacturing method thereof. A light-transmitting conductive layer which functions as a gate electrode, a gate insulating film formed over the light-transmitting conductive layer, a semiconductor layer formed over the light-transmitting conductive layer which functions as the gate electrode with the gate insulating film interposed therebetween, and a light-transmitting conductive layer which is electrically connected to the semiconductor layer and functions as source and drain electrodes are included. | 11-19-2009 |
20090303213 | SIGNAL LINE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE - Variations occur in the characteristics of transistors. The present invention is a signal-line drive circuit comprising first and second current source circuits corresponding to respective plurality of signal lines, a shift register, and n (n is a natural number of one or more) video-signal constant current source s, wherein each of the first and second current source circuits has a capacitance means and a supply means. The capacitance means held in one of the first and second source circuits converts a current including a current supplied from each of the n video-signal constant current source s to voltage in response to a sampling pulse supplied from the shift register and a latch pulse supplied from the exterior; and the supply means held in the other supplies a current responsive to the converted voltage. The values of the currents supplied from the n video-signal constant current source s are set to a proportion of 2 | 12-10-2009 |
20090303219 | DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - A liquid crystal display device includes a pixel having a first to nth (n is a natural number of 2 or more) subpixels and a circuit. To the circuit N (N is a natural number of 2 or more) wirings for supplying a digital signal with N bits and first to nth wiring groups having M (M is a natural number of 2 or more) wirings for supplying M different voltages are electrically connected. The liquid crystal display device has a function of converting the digital signal into n analog signals by using the M voltages supplied to the first to nth wiring groups and inputting the n analog signals to first to nth subpixels. The first to nth subpixels each include an electrode for driving a liquid crystal element. | 12-10-2009 |
20090322382 | Semiconductor Device, Driving Method Thereof and Electronic Device - The invention provides a semiconductor device having a current input type pixel in which a signal write speed is increased and an effect of variations between adjacent transistors is reduced. When a set operation is performed (write a signal), a source-drain voltage of one of two transistors connected in series becomes quite low, thus the set operation is performed to the other transistor. In an output operation, the two transistors operate as a multi-gate transistor, therefore, a current value in the output operation can be small. In other words, a current in the set operation can be large. Therefore, an effect of intersection capacitance and wiring resistance which are parasitic on a wiring and the like do not affect much, thereby the set operation can be performed rapidly. As one transistor is used in the set operation and the output operation, an effect of variations between adjacent transistors is lessened. | 12-31-2009 |
20100039356 | Driving Method of Display Device - In a display device for displaying gray scales by dividing one frame into a plurality of subframes and using a time gray scale method, pseudo contour is generated. In the case where high-order bits are displayed, gray scales are displayed by sequentially adding the weight (light-emitting period, the frequency of light emission, and the like) of each subframe. Similarly, in the case where low-order bits are displayed, gray scales are displayed by sequentially adding the weight (light-emitting period, the frequency of light emission, and the like) of each subframe. The subframes for the high-order bits and the subframes for the low-order bits are arranged so as not to be concentrated at one portion in one frame. | 02-18-2010 |
20100053519 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPARATUS - The present invention provides a liquid crystal display device including a liquid crystal layer disposed between a first substrate and a second substrate, a pixel electrode in a reflection region and a transmission region over the first substrate, a film for adjusting a cell gap in the reflection region over the first substrate, and an opposite electrode in the reflection region and the transmission region over the second substrate. The pixel electrode in the reflection region is provided over the film and reflects light. The pixel electrode in the transmission region transmits light. The pixel electrode in the reflection region and the transmission region includes a slit. The slit is overlapped with at least a part of a step portion which is provided by the film between the reflection region and the transmission region. | 03-04-2010 |
20100066653 | DISPLAY DEVICE AND ELECTRONIC DEVICE - It is an object of the present invention to provide a display device in which images can be seen under a dark place to intense external light. In the display device, display is performed by changing the gray scale number depending on external light intensity, and display modes can be switched depending on contents displayed on the screen. An analog mode and a digital mode are switched depending on external light intensity. In an analog digital switching circuit, when a video signal is an analog value, a signal is outputted to a pixel array without any change and, when the video signal is a digital value, the signal is outputted to a circuit that performs a digital operation such as a latch circuit. Consequently, display gray scales of a pixel are changed appropriately. Accordingly, a clear image can be displayed. For example, it is possible to ensure visibility in a wide range of a dark place or under indoor florescent light to outdoor sun light. | 03-18-2010 |
20100073406 | Display Device, and Driving Method and Electronic Apparatus of the Display Device - The present invention provides a driving method of a display device for expressing gray scales with n bits (n is an integer) by dividing one frame into a plurality of subframes. By this driving method, pseudo contours which occur in displaying images by a time gray scale method can be reduced. | 03-25-2010 |
20100078643 | DISPLAY DEVICE - In view of the problem that a reduced thickness of an EL film causes a short circuit between an anode and a cathode and malfunction of a transistor, the invention provides a display device that has a light emitting element including an electrode and an electroluminescent layer, a wire electrically connected to the electrode of the light emitting element, a transistor provided with an active layer including a source, a drain and a channel forming region, and a power supply line electrically connected to one of the source and the drain of the transistor, wherein the wire is electrically connected to the other of the source and the drain of the transistor, and the width of a part of the electrode in the vicinity of a portion where the electrode is electrically connected to the wire is smaller than that of the electrode in the other portion. | 04-01-2010 |
20100079177 | SEMICONDUCTOR DEVICE - A light emitting device capable of performing signal electric current write-in operations at high speed and without dispersion in the characteristics of TFTs structuring pixels influencing the brightness of light emitting elements is provided. The gate length L of a transistor in which an electric current flows during write-in of a signal electric current is made shorter than the gate length L of a transistor in which electric current supplied to EL elements flows during light emission, and high speed write-in is thus performed by having a larger electric current flow than the electric current flowing in conventional EL elements. A converter and driver transistor ( | 04-01-2010 |
20100103089 | DISPLAY DEVICE - It is an object to improve image quality in displaying a still image and a moving image by suppressing flickers, a display malfunction, or the like of a display device. A method for controlling the light emission state of a backlight is made different between a still image portion and a moving image portion included in an image to be displayed. In specific, the amount of light emission in the still image portion is made as small as possible in a corresponding divided region of the backlight, and the amount of light emission in the moving image portion is controlled so as not to be changed as much as possible in a corresponding divided region of the backlight. | 04-29-2010 |
20100110113 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE AND ELECTRONIC APPARATUS - When a resistance load inverter is used to control lighting/non-lighting of a pixel, in accordance with characteristic variations of a transistor forming the resistance load inverter, variations occur in light emission of each pixel. As an inverter in a pixel, an N channel transistor and a P channel transistor are used to apply a CMOS inverter. Even when characteristics of the transistor forming the CMOS inverter vary and inverter transfer characteristics vary, there is little effect on controlling lighting/non-lighting of the pixel, therefore, light emission variations of each pixel can be eliminated. Further, a signal potential of a scan line is used as one power source of a potential of the inverter, therefore, an aperture ratio of the pixel can be increased. | 05-06-2010 |
20100123654 | LIQUID CRYSTAL DISPLAY DEVICE - To suppress a malfunction of a circuit due to deterioration in a transistor. In a transistor which continuously outputs signals having certain levels (e.g., L-level signals) in a pixel or a circuit, the direction of current flowing through the transistor is changed (inverted). That is, by changing the level of voltage applied to a first terminal and a second terminal (terminals serving as a source and a drain) every given period, the source and the drain are switched every given period. Specifically, in a portion which successively outputs signals having certain levels (e.g., L-level signals) in a circuit including a transistor, L-level signals having a plurality of different potentials (L-level signals whose potentials are changed every given period) are used as the signals having certain levels. | 05-20-2010 |
20100134435 | TOUCH PANEL, DISPLAY DEVICE PROVIDED WITH TOUCH PANEL AND ELECTRONIC EQUIPMENT PROVIDED WITH DISPLAY DEVICE - A touch panel using an optical sensor has a simple construction and can accurately detect an input position. An illuminating lights emitted from illuminating means are turned into lights having a high directivity in an X-axis direction and in a Y-axis direction of the prism lens sheet and thereafter enter from side faces of a light guide panel as incident lights. The incident lights advance in the inside of the light guide panel toward opposite side faces while being subjected to a total reflection and are received by the optical sensor arrays. When an input pen or a fingertip touches a surface of the light guide panel, the lights are refracted or absorbed at a touched position and hence, a quantity of received lights at the optical sensor arrays is reduced. | 06-03-2010 |
20100134708 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS HAVING THE SAME - With an offset circuit including transistors of the same conductivity type, offset of an input signal is performed. Then, the input signal after the offset is supplied to a logic circuit including transistors of the same conductivity type as that of the offset circuit, thereby H and L levels of the input signal can be shifted at the same time. Further, since the offset circuit and the logic circuit are formed using the transistors of the same conductivity type, a display device can be manufactured at a low cost. | 06-03-2010 |
20100140613 | SEMICONDUCTOR DEVICE - A semiconductor device includes an oxide semiconductor layer provided over a substrate having an insulating surface; a gate insulating film covering the oxide semiconductor layer; a first conductive layer and a second conductive layer laminated in this order over the gate insulating film; an insulating film covering the oxide semiconductor layer and a gate wiring including a gate electrode (the first and second conductive layers); and a third conductive layer and a fourth conductive layer laminated in this order over the insulating film and electrically connected to the oxide semiconductor layer. The gate electrode is formed using the first conductive layer. The gate wiring is formed using the first conductive layer and the second conductive layer. A source electrode is formed using the third conductive layer. A source wiring is formed using the third conductive layer and the fourth conductive layer. | 06-10-2010 |
20100141630 | DISPLAY DEVICE, METHOD FOR DRIVING THE SAME, AND ELECTRONIC DEVICE USING THE DISPLAY DEVICE AND THE METHOD - An object is to reduce degradation of display quality due to variation in luminance of light-emitting elements, which is caused by variation in voltage because of wiring resistance of current supply lines, and to improve the display quality. In a voltage program period, a terminal serving as a source of a transistor for driving an EL element is electrically connected to a first wiring to which a first potential is supplied. In a light-emitting period, the terminal serving as the source of the driving transistor is electrically connected to a second wiring to which a second potential is supplied. Accordingly, voltage between a gate terminal and the source terminal of the driving transistor can be held without being adversely affected by wiring resistance of the current supply lines. | 06-10-2010 |
20100141841 | DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - In a multi-window display device, the following has been merely performed: before data for plural screens is inputted to a display, video signals themselves are subjected to signal processing, and the processed video signals are inputted to the display, whereby display is performed. Therefore, a circuit for performing signal processing, for example, an IC has a complicated structure since video signals for plural screens are stored in a memory. There is provided a pixel structure in which: signal lines for plural screens are arranged; and one of the signal lines is selected to supply a video signal to a display element. For example, in the case of performing display of two screens, there is provided a pixel structure in which: two signal lines, which are inputted with respective video signals for a first screen and a second screen, are arranged; and one of the signal lines is selected to supply a video signal from the selected signal line to a display element. | 06-10-2010 |
20100149160 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A display device includes a load, a transistor for controlling a current value supplied to the load, a capacitor, a first wiring, a second wiring, and first to fourth switches. Variations in the current value caused by variations in the threshold voltage of the transistor can be suppressed through the steps of: (1) holding the threshold voltage of the transistor in the storage capacitor, (2) inputting a potential in accordance with a video signal, and (3) holding a voltage that is the sum of the threshold voltage and the potential in accordance with the video signal, in the storage capacitor. Accordingly, a desired current can be supplied to the load such as a light emitting element. | 06-17-2010 |
20100156877 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC APPLIANCE - In case the size of the transistor is enlarged, power consumption of the transistor is increased. Thus, the present invention provides a display device capable of preventing a current from flowing to a display element in signal writing operation without varying potentials of power source lines for supplying a current to the display element per row. In setting a gate-source voltage of a transistor by applying a predetermined current to the transistor, a potential of a gate terminal of the transistor is adjusted so as to prevent a current from flowing to a load connected to a source terminal of the transistor. Therefore, a potential of a wire connected to the gate terminal of the transistor is differentiated from a potential of a wire connected to a drain terminal of the transistor. | 06-24-2010 |
20100156955 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - A low-resolution image is displayed at high resolution and power consumption is reduced. Resolution is made higher by super-resolution processing. Then, display is performed with the luminance of a backlight controlled by local dimming after the super-resolution processing. By controlling the luminance of the backlight, power consumption can be reduced. Further, by performing the local dimming after the super-resolution processing, accurate display can be performed. | 06-24-2010 |
20100164599 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS USING THE SAME - The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source. | 07-01-2010 |
20100171685 | DISPLAY DEVICE - To provide a high-performance and highly reliable display device with a high aperture ratio, including light-emitting elements, and a manufacturing method thereof, and a technique for manufacturing such a display device at a low cost with high productivity. A compensating circuit, a light-emitting element, a switch, and a transistor are included, in which one terminal of the switch is electrically connected to the compensating circuit, a gate of the transistor is electrically connected to the compensating circuit, one of a source and a drain of the transistor is electrically connected to a first electrode of the light-emitting element, the other of the source and the drain of the transistor is maintained at a certain potential, and a second electrode of the light-emitting element and the other terminal of the switch are electrically connected to the same wire. | 07-08-2010 |
20100177269 | DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - In a semi-transmission liquid crystal display device, two resist masks are required to form a reflective electrode and a transparent electrode; therefore, cost is high. A transparent electrode and a reflective electrode which function as a pixel electrode are stacked. A resist pattern which includes a region having a thick film thickness and a region having a thinner film thickness than the aforementioned region is formed over the reflective electrode by using a light exposure mask which includes a semi-transmission portion. The reflective electrode and the transparent electrode are formed by using the resist pattern. Therefore, the reflective electrode and the transparent electrode can be formed by using one resist mask. | 07-15-2010 |
20100182306 | METHOD FOR DRIVING DISPLAY DEVICE - To suppress degradation of a transistor. A method for driving a liquid crystal display device has a first period and a second period. In the first period, a first transistor and a second transistor are alternately turned on and off repeatedly, and a third transistor and a fourth transistor are turned off. In the second period, the first transistor and the second transistor are turned off, and the third transistor and the fourth transistor are alternately turned on and off repeatedly. Accordingly, the time during which the transistor is on can be reduced, so that degradation of characteristics of the transistor can be suppressed. | 07-22-2010 |
20100193785 | SEMICONDUCTOR DEVICE - It is an object to provide a semiconductor device which has a large size and operates at high speed. A top gate transistor which includes a semiconductor layer of single-crystal and a bottom gate transistor which includes a semiconductor layer of amorphous silicon (microcrystalline silicon) are formed over the same substrate. Then, gate electrodes of each transistor are formed with the same layer, and source and drain electrodes are also formed with the same layer. Thus, manufacturing steps are reduced. In other words, two types of transistors can be manufactured by adding only a few steps to the manufacturing process of a bottom gate transistor. | 08-05-2010 |
20100201661 | Semiconductor Device and Display Device - If misalignment in a line width direction of an electrode (pad) of a connection terminal is caused in attachment of a substrate and an FPC, a connection area of the FPC terminal and the connection terminal becomes smaller and contact resistance is increased. In particular, an increase in contact resistance of the connection terminal to which a power supply potential serving as a power source is inputted is a cause of defective display. In view of the above, an object of the present invention is to decrease the resistance of a power supply line, to suppress a voltage drop in the power supply line, and to prevent defective display. A connection terminal portion includes a plurality of connection terminals. The plurality of connection terminals is provided with a plurality of connection pads which is part of the connection terminal. The plurality of connection pads includes a first connection pad and a second connection pad having a line width different from that of the first connection pad. Pitches between the plurality of connection pads are equal to each other. | 08-12-2010 |
20100201719 | METHOD FOR DRIVING DISPLAY DEVICE - A low-resolution image is displayed at higher resolution and afterimages are reduced. Resolution is made higher by super-resolution processing. In this case, the super-resolution processing is performed after frame interpolation processing is performed. Further, in that case, the super-resolution processing is performed using a plurality of processing systems. Therefore, even when frame frequency is made higher, the super-resolution processing can be performed at high speed. Further, since frame rate doubling is performed by the frame interpolation processing, afterimages can be reduced. | 08-12-2010 |
20100220092 | Semiconductor Device and Driving Method Thereof, and Electronic Device - A driving method of a semiconductor device for compensating variation in threshold voltage and mobility of a transistor is provided. A driving method of a semiconductor device including a transistor and a capacitor electrically connected to a gate of the transistor includes a first period where voltage corresponding to threshold voltage of the transistor is held in the capacitor, a second period where a total voltage of video signal voltage and threshold voltage is held in the capacitor holding the threshold voltage, and a third period where charge held in the capacitor in accordance with the total voltage of the video signal voltage and the threshold voltage in the second period is discharged through the transistor. | 09-02-2010 |
20100220117 | Method for Driving Semiconductor Device - To provide a method for driving a semiconductor device, by which influence of variation in threshold voltage and mobility of transistors can be reduced. The semiconductor device includes an n-channel transistor, a switch for controlling electrical connection between a gate and a first terminal of the transistor, a capacitor electrically connected between the gate and a second terminal of the transistor, and a display element. The method has a first period for holding the sum of a voltage corresponding to the threshold voltage of the transistor and an image signal voltage in the capacitor; a second period for turning on the switch so that electric charge held in the capacitor in accordance with the sum of the image signal voltage and the threshold voltage is discharged through the transistor; and a third period for supplying a current to the display element through the transistor after the second period. | 09-02-2010 |
20100224872 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a substrate having an insulating surface; a light-transmitting first electrode provided over the substrate; a light-transmitting second electrode provided over the substrate; a light-transmitting semiconductor layer provided so as to be electrically connected to the first electrode and the second electrode; a first wiring electrically connected to the first electrode; an insulating layer provided so as to cover at least the semiconductor layer; a light-transmitting third electrode provided over the insulating layer in a region overlapping with the semiconductor layer; and a second wiring electrically connected to the third electrode. | 09-09-2010 |
20100224878 | SEMICONDUCTOR DEVICE - A semiconductor device includes a semiconductor layer over a substrate; a gate insulating film covering the semiconductor layer; a gate wiring including a gate electrode, which is provided over the gate insulating film and is formed by stacking a first conductive layer and a second conductive layer; an insulating film covering the semiconductor layer and the gate wiring including the gate electrode; and a source wiring including a source electrode, which is provided over the insulating film, is electrically connected to the semiconductor layer, and is formed by stacking a third conductive layer and a fourth conductive layer. The gate electrode is formed using the first conductive layer. The gate wiring is formed using the first conductive layer and the second conductive layer. The source electrode is formed using the third conductive layer. The source wiring is formed using the third conductive layer and the fourth conductive layer. | 09-09-2010 |
20100224880 | SEMICONDUCTOR DEVICE - It is an object to provide a semiconductor device with low wiring resistance, high transmittance, or a high aperture ratio. A gate electrode, a semiconductor layer, and a source electrode and a drain electrode are formed using a material having a light-transmitting property and a wiring such as a gate wiring or a source wiring is formed using a material whose resistivity is lower than that of the material having a light-transmitting property. Alternatively, the source wiring and/or the gate wiring are/is formed by a stack of a material having a light-transmitting property and a material whose resistivity is lower than that of the material having a light-transmitting property. | 09-09-2010 |
20100224934 | DISPLAY DEVICE - The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern. | 09-09-2010 |
20100238391 | LIQUID CRYSTAL DISPLAY DEVICE - A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 09-23-2010 |
20100245307 | Liquid Crystal Display Device and Electronic Device Including the Same - A driver circuit includes a circuit | 09-30-2010 |
20100245335 | LIQUID CRYSTAL DISPLAY DEVICE, DRIVING METHOD OF THE SAME, AND ELECTRONIC DEVICE INCLUDING THE SAME - It is an object to suppress deterioration of characteristics of a transistor in a driver circuit. A first switch for controlling whether to set a potential state of an output signal by being turned on and off in accordance with the first input signal, and a second switch for controlling whether to set a potential state of an output signal by being turned on and off in accordance with the second input signal are included. A first wiring and a second wiring are brought into electrical continuity by turning on and off of the first switch or the second switch. | 09-30-2010 |
20100245749 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer. | 09-30-2010 |
20100246750 | Semiconductor Device and Electronic Device Including Semiconductor Device - It is an object to suppress deterioration in characteristics of a transistor in a driver cricuit. A driver circuit includes a first transistor, a second transistor including a gate and one of a source and a drain to which a second signal is inputted, a third transistor whose gate is electrically connected to one of a source and a drain of the first transistor and which controls whether a voltage state of an output signal is set or not by being turned on/off, and a fourth transistor whose gate is electrically connected to the other of the source and the drain of the second transistor and which controls whether a voltage state of an output signal is set or not by being turned on/off. | 09-30-2010 |
20100253670 | SIGNAL LINE DRIVER CIRCUIT, LIGHT EMITTING DEVICE AND DRIVING METHOD THEREOF - Variation occurs in transistor characteristics. The present invention relates to a signal line driver circuit comprising a plurality of current source circuits respectively corresponding to a plurality of wirings, characterized in that: the plurality of current source circuits each comprise capacitor means and supply means; and the plurality of current source circuits each convert a supplied current into a voltage in accordance with a video signal, and supply a current corresponding to the converted voltage. | 10-07-2010 |
20100253813 | DEFECTIVE PIXEL SPECIFYING METHOD, DEFECTIVE PIXEL SPECIFYING SYSTEM, IMAGE CORRECTING METHOD, AND IMAGE CORRECTING SYSTEM - A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read. | 10-07-2010 |
20100259653 | METHOD FOR DRIVING SEMICONDUCTOR DEVICE - The resolution of a low-resolution image is made high and a stereoscopic image is displayed. Resolution is made high by super-resolution processing. In this case, the super-resolution processing is performed after edge enhancement processing is performed. Accordingly, a stereoscopic image with high resolution and high quality can be displayed. Alternatively, after image analysis processing is performed, edge enhancement processing and super-resolution processing are concurrently performed. Accordingly, processing time can be shortened. | 10-14-2010 |
20100277516 | DRIVING METHOD OF DISPLAY DEVICE - It is an object to provide a driving method of a display device capable of reducing pseudo contours while increase in the number of sub-frames is suppressed as much as possible. In a driving method of a display device where one frame is divided into a plurality of sub-frames to display a gray scale, the plurality of sub-frames has a plurality of middle-order sub-frames each of which has a middle-degree weighting and is used for an overlapping time gray scale method, at least one high-order sub-frame which has a larger weighting than that of the middle-order sub-frame and is used for a binary code time gray scale method, and at least one low-order sub-frame which has a smaller weighting than that of the middle-order sub-frame and is used for a binary code time gray scale method. | 11-04-2010 |
20100277671 | Display Device - A cooling device is provided, where an LED backlight can be efficiently cooled in order to suppress display unevenness caused by heat generated from the LED backlight. In addition, a display device including the cooling device is also provided. A display device is provided, where the LED backlight can be cooled by arranging a coolant pipe on a back surface side of the LED backlight and supplying a coolant to a coolant pipe. Further, a display device is provided, where cooling efficiency of the LED backlight can be more improved by arranging a thermal conductor between the LED backlight and the cooling device. | 11-04-2010 |
20100283524 | SEMICONDUCTOR DEVICE - A shift register capable of supplying only a necessary clock signal to a necessary unit register with simple constitution. A semiconductor device is provided with a shift register in which a plurality of stages of unit registers is connected, in which the unit register comprises a flip-flop circuit, a first switch and a second switch, a first clock signal line is electrically connected to the flip-flop circuit through the first switch, a second clock signal line is electrically connected to the flip-flop circuit through the second switch, the first switch is controlled to be on/off by an output signal from the flip-flop circuit, and the second switch is controlled to be on/off by an input signal to the flip-flop circuit. | 11-11-2010 |
20100289558 | Booster Circuit, Semiconductor Device, and Electronic Apparatus - A conventional circuit requires a booster circuit for generating a voltage higher than an external power supply voltage, thus low power consumption is difficult to be achieved. In addition, a display device incorporating the aforementioned conventional switching element for booster circuit has problems in that the current load is increased and the power supply becomes unstable with a higher output current. The invention provides a booster circuit including a first transistor, a second transistor, a first capacitor element, a second capacitor element, a diode, and an inverter, wherein one electrode of the first transistor is maintained at a predetermined potential, the output of the inverter is connected to the gate electrode of the first transistor and one electrode of the second transistor through the second capacitor element, the input of the inverter is connected to the other electrode of the first transistor through the first capacitor element and connected to the gate electrode of the second transistor, and the diode is connected between the other electrode of the first transistor and the other electrode of the second transistor so as to be forwardly biased. | 11-18-2010 |
20100295838 | ELECTRONIC CIRCUIT, DISPLAY DEVICE, ELECTRONIC DEVICE, AND METHOD FOR DRIVING ELECTRONIC CIRCUIT - To control the state of an input signal and output signal of a sequential circuit in order to prevent a malfunction of an electronic circuit. An electronic circuit includes a sequential circuit and a control circuit. A first signal, a second signal, and a third signal are input to the sequential circuit as a start signal, a clock signal, and a reset signal, respectively. The sequential circuit outputs, as an output signal, a fourth signal whose state is set in accordance with the state of the inputted first signal, second signal, and third signal. The control circuit controls the state of the third signal input to the sequential circuit. | 11-25-2010 |
20100296041 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode. | 11-25-2010 |
20100309177 | Semiconductor Device, and Display Device and Electronic Device Utilizing the Same - A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor | 12-09-2010 |
20100321088 | Electric Circuit - A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor. | 12-23-2010 |
20100328288 | SEMICONDUCTOR INTEGRATED CIRCUIT AND METHOD OF DRIVING THE SAME - A transistor causes fluctuation in the threshold and mobility due to the factor such as fluctuation of the gate length, the gate width, and the gate insulating film thickness generated by the difference of the manufacturing steps and the substrate to be used. As a result, there is caused fluctuation in the current value supplied to the pixel due to the influence of the characteristic fluctuation of the transistor, resulting in generating streaks in the display image. A light emitting device is provided which reduces influence of characteristics of transistors in a current source circuit constituting a signal line driving circuit until the transistor characteristics do not affect the device and which can display a clear image with no irregularities. A signal line driving circuit of the present invention can prevent streaks in a displayed image and uneven luminance. Also, the present invention makes it possible to form elements of a pixel portion and driving circuit portion from polysilicon on the same substrate integrally. In this way, a display device with reduced size and current consumption is provided as well as electronic equipment using the display device. | 12-30-2010 |
20110007044 | Semiconductor Device, and Display Device and Electronic Device Utilizing the Same - A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor | 01-13-2011 |
20110012645 | SIGNAL LINE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE - Dispersion occurs in the characteristics of the transistors. The invention is a signal line driving circuit having a first and a second current source circuits corresponding to each of a plurality of signal lines, a shift register, and a constant current source for video signal, in which the first current source circuit is disposed in a first latch and the second current source circuit is disposed in a second latch. The first current source circuit includes capacitive means for converting the current supplied from the constant current source for video signal into a voltage, according to a sampling pulse supplied from the shift register, and supplying means for supplying the current corresponding to the converted voltage. The second current source circuit includes capacitive means for converting the current supplied from the first latch into a voltage, according to a latch pulse, and supplying means for supplying the current corresponding to the converted voltage. | 01-20-2011 |
20110012939 | Display Device and Driving Method Thereof - [Problem] In the case where variations of environmental temperature or variations with time occur depending on characteristics of a light-emitting element, variations are generated in luminance. In the invention, a display device for suppressing effects due to variations of a current value of a light-emitting element, which is caused by variations of environmental temperature and variations with time. | 01-20-2011 |
20110018592 | Electric Circuit - As for a transistor, overlapped are factors such as a variation of a gate insulation film which occurs due to a difference of a manufacturing process and a substrate used and a variation of a crystalline state in a channel forming region and thereby, there occurs a variation of a threshold voltage and mobility of a transistor. | 01-27-2011 |
20110024758 | LIQUID CRYSTAL DISPLAY DEVICE AND SEMICONDUCTOR DEVICE - By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode. | 02-03-2011 |
20110024760 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. By inputting a potential in accordance with a video signal into the pixel after the threshold voltage of the transistor is held in the storage capacitor, and holding a voltage of the sum of the threshold voltage and the potential, variations of a current value caused by variations of threshold voltage of a transistor can be suppressed. Consequently, a predetermined current can be supplied to the load such as a light-emitting element. Further, by changing the potential of a power supply line, a display device with a high duty ratio can be provided. | 02-03-2011 |
20110031498 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a pixel portion having a first thin film transistor and a driver circuit having a second thin film transistor. Each of the first thin film transistor and the second thin film transistor includes a gate electrode layer, a gate insulating layer, a semiconductor layer, a source electrode layer, and a drain electrode layer. Each of the layers of the first thin film transistor has a light-transmitting property. Materials of the gate electrode layer, the source electrode layer and the drain electrode layer of the first thin film transistor are different from those of the second transistor, and each of the resistances of the second thin film transistor is lower than that of the first thin film transistor. | 02-10-2011 |
20110031499 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - An object is to provide a semiconductor device in which characteristics of a driver circuit portion are improved while the aperture ratio of a pixel portion is increased. Alternatively, it is an object to provide a semiconductor device with low power consumption or to provide a semiconductor device in which the threshold voltage of a transistor can be controlled. The semiconductor device includes a substrate having an insulating surface, a pixel portion provided over the substrate, and at least some of driver circuits for driving the pixel portion. A transistor included in the pixel portion and a transistor included in the driver circuit are top-gate bottom-contact transistors. Electrodes and a semiconductor layer of the transistor in the pixel portion have light-transmitting properties. The resistance of electrodes in the driver circuit is lower than the electrodes included in the transistor in the pixel portion. | 02-10-2011 |
20110032435 | LIQUID CRYSTAL DISPLAY DEVICE, SEMICONDUCTOR DEVICE, AND ELECTRONIC APPLIANCE - The liquid crystal display device includes an island-shaped first semiconductor film | 02-10-2011 |
20110037917 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPLIANCE - A pixel electrode or a common electrode is a light-transmissive conductive film; therefore, it is formed of ITO conventionally. Accordingly, the number of manufacturing steps and masks, and manufacturing cost have been increased. An object of the present invention is to provide a semiconductor device, a liquid crystal display device, and an electronic appliance each having a wide viewing angle, less numbers of manufacturing steps and masks, and low manufacturing cost compared with a conventional device. A semiconductor layer of a transistor, a pixel electrode, and a common electrode of a liquid crystal element are formed in the same step. | 02-17-2011 |
20110057190 | SEMICONDUCTOR DEVICE AND DISPLAY DEVICE - A semiconductor device including a circuit which does not easily deteriorate is provided. The semiconductor device includes a first transistor, a second transistor, a first switch, a second switch, and a third switch. A first terminal of the first transistor is connected to a first wiring. A second terminal of the first transistor is connected to a second wiring. A gate and a first terminal of the second transistor are connected to the first wiring. A second terminal of the second transistor is connected to a gate of the first transistor. The first switch is connected between the second wiring and a third wiring. The second switch is connected between the second wiring and the third wiring. The third switch is connected between the gate of the first transistor and the third wiring. | 03-10-2011 |
20110057918 | DISPLAY DEVICE AND ELECTRONIC DEVICE - A display device including a pixel having a memory. The pixel includes at least a display element, a capacitor, an inverter, and a switch. The switch is controlled with a signal held in the capacitor and a signal output from the inverter so that voltage is supplied to the display element. The inverter and the switch can be constituted by transistors with the same polarity. A semiconductor layer included in the pixel may be formed using a light-transmitting material. Moreover, a gate electrode, a drain electrode, and a capacitor electrode may be formed using a light-transmitting conductive layer. The pixel is formed using a light-transmitting material in such a manner, whereby the display device can be a transmissive display device while including a pixel having a memory. | 03-10-2011 |
20110058074 | DEFECTIVE PIXEL SPECIFYING METHOD, DEFECTIVE PIXEL SPECIFYING SYSTEM, IMAGE CORRECTING METHOD, AND IMAGE CORRECTING SYSTEM - A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read. | 03-10-2011 |
20110075038 | LIGHT EMITTING DEVICE AND PRODUCTION SYSTEM OF THE SAME - To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained. | 03-31-2011 |
20110090189 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE AND ELECTRONIC DEVICE EQUIPPED WITH THE SEMICONDUCTOR DEVICE - The present invention provides a semiconductor device which can prevent a current from flowing into a display element at a signal writing operation, without increasing power consumption and without changing a potential of a power supply for supplying a current to a load in each row. When a predetermined current is supplied to a transistor to set a gate-source voltage of the transistor, a potential of a gate terminal of the transistor is adjusted so as to prevent a current from flowing into a load which is connected to a source terminal of the transistor. Thus, a potential of a wire connected to the gate terminal of the transistor is made different from that of a wire connected to a drain terminal of the transistor. At that time, an operation of a transistor is shifted so as to allow a large amount of current to flow, and influences by intersection capacitance parasitic to a wire or the like or wire resistance are hardly caused, and a set operation is conducted quickly. | 04-21-2011 |
20110090444 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE - To provide a semiconductor device, a liquid crystal display device, and an electronic device which have a wide viewing angle and in which the number of manufacturing steps, the number of masks, and manufacturing cost are reduced compared with a conventional one. The liquid crystal display device includes a first electrode formed over an entire surface of one side of a substrate; a first insulating film formed over the first electrode; a thin film transistor formed over the first insulating film; a second insulating film formed over the thin film transistor; a second electrode formed over the second insulating film and having a plurality of openings; and a liquid crystal over the second electrode. The liquid crystal is controlled by an electric field between the first electrode and the second electrode. | 04-21-2011 |
20110115758 | Semiconductor Device and Method of Driving the Semiconductor Device - Display irregularities in light emitting devices, which develop due to dispersions per pixel in the threshold value of TFTs for supplying electric current to light emitting elements, are obstacles to increasing the image quality of the light emitting devices. An electric potential in which the threshold voltage of a TFT ( | 05-19-2011 |
20110121307 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer. | 05-26-2011 |
20110122164 | Display Device and Driving Method and Electronic Apparatus of the Display Device - To reduce a pseudo contour which occurs when displaying by a time gray scale method. When gradation is expressed with an n bit, bits each of which is shown by a binary of the gray scales are divided into three bit groups, and one frame is divided into two subframe groups. Then, a (0 | 05-26-2011 |
20110133823 | Booster Circuit, Semiconductor Device, and Electronic Apparatus - A conventional circuit requires a booster circuit for generating a voltage higher than an external power supply voltage, thus low power consumption is difficult to be achieved. In addition, a display device incorporating the aforementioned conventional switching element for booster circuit has problems in that the current load is increased and the power supply becomes unstable with a higher output current. The invention provides a booster circuit including a first transistor, a second transistor, a first capacitor element, a second capacitor element, a diode, and an inverter, wherein one electrode of the first transistor is maintained at a predetermined potential, the output of the inverter is connected to the gate electrode of the first transistor and one electrode of the second transistor through the second capacitor element, the input of the inverter is connected to the other electrode of the first transistor through the first capacitor element and connected to the gate electrode of the second transistor, and the diode is connected between the other electrode of the first transistor and the other electrode of the second transistor so as to be forwardly biased. | 06-09-2011 |
20110133828 | Semiconductor Device - A semiconductor device is provided in which a transistor which supplies a current to a load (an EL pixel and a signal line) can supply an accurate current without being affected by a variation. A voltage of each terminal of a transistor is controlled by using a feedback circuit using an amplifier circuit. A current Idata is inputted from a current source circuit to a transistor and a gate-source voltage (a source potential) required for the transistor to flow the current Idata is set by using the feedback circuit. The feedback circuit is controlled to operate so that a drain potential of the transistor becomes a predetermined potential. Then, a gate voltage required to flow the current Idata is set. By using the set transistor, an accurate current can be supplied to the load (an EL element and a signal line). As a drain potential can be controlled, the kink effect can be reduced. | 06-09-2011 |
20110134142 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - An object is to reduce residual images and power consumption in a liquid crystal display device. The liquid crystal display device capable of inputting an image signal to a pixel portion selectively is provided. It is possible for the liquid crystal display device to input the image signal only to a region in which a fast-moving image is displayed. Therefore, residual images in displaying a moving image can be reduced. Further, in the liquid crystal display device, it is acceptable that the image signal is not input to a region in which a slow-moving image is displayed; accordingly, power consumption can be reduced. | 06-09-2011 |
20110134163 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - Each pixel of a display device has a current supply circuit, a switch portion, and a light emitting element. The light emitting element, the current supply circuit, and the switch portion are connected in series between a power supply reference line and a power supply line. The switch portion is switched between ON and OFF using a digital video signal. The amount of constant current flowing in the current supply circuit is determined by a control signal inputted from the outside of the pixel. When the switch portion is ON, a constant current determined by the current supply circuit flows in the light emitting element and light is emitted. As a result, a low-cost display device can be provided in which the light emitting element can emit light at a constant luminance even when the current characteristic is changed by degradation or the like, which is fast in writing signals in pixels, which can display in gray scales accurately, and which can be reduced in size with a low cost, as well as a driving method of the display device. | 06-09-2011 |
20110134345 | DISPLAY DEVICE - The time taken to write a signal to a pixel is shortened in a display device. Further, a signal is written at high speed even when high voltage is applied. The display device includes a pixel including a transistor and a liquid crystal element electrically connected to a source or a drain of the transistor. The transistor includes an intrinsic or substantially intrinsic oxide semiconductor as a semiconductor material and has an off-state current of 1×10 | 06-09-2011 |
20110134350 | DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - A low-power-consuming display device including a liquid crystal material which exhibits a blue phase is provided. A display device includes a first substrate having a pixel portion in which a pixel including a transistor is provided; a second substrate which faces the first substrate; and a liquid crystal layer between the first substrate and the second substrate; in which the liquid crystal layer includes a liquid crystal material which exhibits a blue phase; a gate of the transistor is electrically connected to a scan line, one of a source and a drain of the transistor is electrically connected to a signal line, and the other of the source and the drain of the transistor is electrically connected to an electrode; and the transistor includes an oxide semiconductor layer a hydrogen concentration of which is | 06-09-2011 |
20110134353 | Liquid Crystal Display Device - It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode. | 06-09-2011 |
20110134379 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPARATUS - The present invention provides a liquid crystal display device including a liquid crystal layer disposed between a first substrate and a second substrate, a pixel electrode in a reflection region and a transmission region over the first substrate, a film for adjusting a cell gap in the reflection region over the first substrate, and an opposite electrode in the reflection region and the transmission region over the second substrate. The pixel electrode in the reflection region is provided over the film and reflects light. The pixel electrode in the transmission region transmits light. The pixel electrode in the reflection region and the transmission region includes a slit. The slit is overlapped with at least a part of a step portion which is provided by the film between the reflection region and the transmission region. | 06-09-2011 |
20110140108 | SEMICONDUCTOR DEVICE AND ELECTRONIC DEVICE - An object is to improve the drive capability of a semiconductor device. The semiconductor device includes a first transistor and a second transistor. A first terminal of the first transistor is electrically connected to a first wiring. A second terminal of the first transistor is electrically connected to a second wiring. A gate of the second transistor is electrically connected to a third wiring. A first terminal of the second transistor is electrically connected to the third wiring. A second terminal of the second transistor is electrically connected to a gate of the first transistor. A channel region is formed using an oxide semiconductor layer in each of the first transistor and the second transistor. The off-state current of each of the first transistor and the second transistor per channel width of 1 μm is 1 aA or less. | 06-16-2011 |
20110141164 | Display Device, Electronic Device and Method of Driving Display Device - The present invention provides a display device which can display characters clearly and display images smoothly. An area gray scale method is adopted and a configuration of one pixel is changed depending on a mode, by selecting one or more display regions in each pixel. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. Thus, clear display can be conducted. When images are needed to be displayed, one pixel is configured by selecting an indented state. Thus, smooth display can be conducted. | 06-16-2011 |
20110163320 | Semiconductor Device, Driving Method Thereof and Electronic Device - The invention provides a semiconductor device having a current input type pixel in which a signal write speed is increased and an effect of variations between adjacent transistors is reduced. When a set operation is performed (write a signal), a source-drain voltage of one of two transistors connected in series becomes quite low, thus the set operation is performed to the other transistor. In an output operation, the two transistors operate as a multi-gate transistor, therefore, a current value in the output operation can be small. In other words, a current in the set operation can be large. Therefore, an effect of intersection capacitance and wiring resistance which are parasitic on a wiring and the like do not affect much, thereby the set operation can be performed rapidly. As one transistor is used in the set operation and the output operation, an effect of variations between adjacent transistors is lessened. | 07-07-2011 |
20110163793 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPLIANCE USING THE SAME - A semiconductor device with less power consumption and an electronic appliance using the same. The semiconductor device of the invention is supplied with a first potential from a high potential power source and a second potential from a low potential power source. Upon input of a first signal to an input node, an output node outputs a second signal. With the semiconductor device of the invention, a potential difference of the second signal can be controlled to be smaller than a potential difference between the first potential and the second potential, thereby power consumption required for charging/discharging wires can be reduced. | 07-07-2011 |
20110169008 | Semiconductor Device - A light emitting device capable of performing signal electric current write-in operations at high speed and without dispersion in the characteristics of TFTs structuring pixels influencing the brightness of light emitting elements is provided. The gate length L of a transistor in which an electric current flows during write-in of a signal electric current is made shorter than the gate length L of a transistor in which electric current supplied to EL elements flows during light emission, and high speed write-in is thus performed by having a larger electric current flow than the electric current flowing in conventional EL elements. A converter and driver transistor ( | 07-14-2011 |
20110169556 | ANALOG CIRCUIT AND DISPLAY DEVICE AND ELECTRONIC DEVICE - The invention provides an analog circuit that decreases an effect of variation of a transistor. By flowing a bias current in a compensation operation, a voltage between the gate and source of the transistor to be compensated is held in a capacitor. In a normal operation, the voltage stored in the compensation operation is added to a signal voltage. As the capacitor holds the voltage according to the characteristics of the transistor to be compensated, the effect of variation can be decreased by adding the voltage stored in the capacitor to the signal voltage. Further, an analog circuit which decreases the effect of variation can be provided by applying the aforementioned basis to a differential circuit, an operational amplifier and the like. | 07-14-2011 |
20110169810 | DISPLAY DEVICE - It is an object to provide a highly reliable display device. It is a feature an IC is over a substrate and a material layer having the same height is thereover. An IC is provided on one side of the substrate, and a material layer having the same height as the IC is provided on at least another side. Further, an IC is provided on one side of the substrate, and material layers having the same height as the IC are provided on the other sides. Further, an IC is provided on one side of the substrate, and a material layer having the same height as the IC is provided at a corner of the substrate. | 07-14-2011 |
20110170029 | Liquid Crystal Display Device - The present invention has a pixel which includes a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 07-14-2011 |
20110181631 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - A pixel is divided into m (m is an integer of m≧2) sub-pixels, and an area ratio of an s-th (s is an integer of 1 to m) sub-pixel is to be 2 | 07-28-2011 |
20110181786 | DISPLAY DEVICE AND ELECTRONIC APPARATUS - To provide a display device whose display can be recognized even in dark places or under the strong outside light. The display device performs display by controlling the number of gray scales in accordance with the intensity of outside light, which means a display mode can be switched in accordance with the data to be displayed on the display screen. A video signal generation circuit is controlled in each display mode in such a manner that it directly outputs an input video signal with an analog value, outputs a signal with a binary digital value, or outputs a signal with a multivalued digital value. As a result, gray scales displayed in pixels are timely changed. Accordingly, clear images can be displayed while maintaining high visibility in various environments, in the wide range from, for example, dark places or indoors (e.g., under a fluorescent lighting) to outdoors (e.g., under the sunlight). | 07-28-2011 |
20110186852 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - In the respect of an electrical characteristic of a transistor, a channel size W/L of a transistor is preferably designed small in order to decrease an effect of a variation in threshold voltage, while the channel size W/L is preferably designed large in order to widen a saturation region as an operation region of the transistor in the respect of characteristic of a light emitting element. Thus, decreasing an effect of a variation in threshold voltage and widening a saturation region in order not to reduce luminance due to a degradation of the light emitting element are in the relation of trade-off. According to the invention, a current capacity of a driving transistor is increased so as to operate in a wide saturation region. A lighting period control circuit is provided in each pixel for changing a lighting period of each pixel separately. Another configuration of the invention includes a plurality of transistors, for example a first driving transistor and a second driving transistor, and a lighting period control circuit for controlling a lighting period of the light emitting element in each pixel. | 08-04-2011 |
20110193846 | DISPLAY DEVICE - An object is to provide a display device that performs accurate display. A circuit is formed using a transistor that includes an oxide semiconductor and has a low off-state current. A precharge circuit or an inspection circuit is formed in addition to a pixel circuit. The off-state current is low because the oxide semiconductor is used. Thus, it is not likely that a signal or voltage is leaked in the precharge circuit or the inspection circuit to cause defective display. As a result, a display device that performs accurate display can be provided. | 08-11-2011 |
20110198599 | Semiconductor Device and Display Device Utilizing the Same - A source-drain voltage of one of two transistors connected in series becomes quite small in a set operation (write signal), thus the set operation is performed to the other transistor. In an output operation, two transistors operate as a multi-gate transistor, therefore, a current value can be small in the output operation. In other words, a current can be large in the set operation. Therefore, the set operation can be performed rapidly without being easily influenced by an intersection capacitance and a wiring resistance which are parasitic on a wiring and the like. Further, an influence of variations between adjacent ones can be small as one same transistor is used in the set operation and the output operation. | 08-18-2011 |
20110199365 | PULSE SIGNAL OUTPUT CIRCUIT AND SHIFT REGISTER - A transistor whose channel region includes an oxide semiconductor is used as a pull down transistor. The band gap of the oxide semiconductor is 2.0 eV or more, preferably 2.5 eV or more, more preferably 3.0 eV or more. Thus, hot carrier degradation in the transistor can be suppressed. Accordingly, the circuit size of the semiconductor device including the pull down transistor can be made small. Further, a gate of a pull up transistor is made to be in a floating state by switching of on/off of the transistor whose channel region includes an oxide semiconductor. Note that when the oxide semiconductor is highly purified, the off-state current of the transistor can be 1 aA/μm (1×10 | 08-18-2011 |
20110204928 | DISPLAY DEVICE, SEMICONDUCTOR DEVICE, AND DRIVING METHOD THEREOF - An object is to provide a semiconductor device with improved operation. The semiconductor device includes a first transistor, and a second transistor electrically connected to a gate of the first transistor. A first terminal of the first transistor is electrically connected to a first line. A second terminal of the first transistor is electrically connected to a second line. The gate of the first transistor is electrically connected to a first terminal or a second terminal of the second transistor. | 08-25-2011 |
20110205144 | Semiconductor Device and Driving Method Thereof - Brightness irregularities that develop in a light emitting device due to is persion among pixels in the threshold values of TFTs used for supplying electric current to light emitting devices become obstacles to improved image quality of the light emitting device. As an image signal input to a pixel from a source signal line, a desired electric potential is applied to a gate electrode of a TFT for supplying electric current to an EL device, through a TFT having its gate and drain connected to each other. A voltage equal to the TFT threshold value is produced between the source and the drain of the TFT | 08-25-2011 |
20110205216 | SIGNAL LINE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE - Dispersion occurs in the characteristics of the transistors. The invention is a signal line driving circuit having a first and a second current source circuits corresponding to each of a plurality of signal lines, a shift register, and a constant current source for video signal, in which the first current source circuit is disposed in a first latch and the second current source circuit is disposed in a second latch. The first current source circuit includes capacitive means for converting the current supplied from the constant current source for video signal into a voltage, according to a sampling pulse supplied from the shift register, and supplying means for supplying the current corresponding to the converted voltage. The second current source circuit includes capacitive means for converting the current supplied from the first latch into a voltage, according to a latch pulse, and supplying means for supplying the current corresponding to the converted voltage. | 08-25-2011 |
20110210950 | Semiconductor Device and Driving Method Thereof - The invention provides a semiconductor device which performs a write operation of a signal current rapidly to a current input type pixel. Before inputting a signal current, a precharge operation is performed by flowing a large current. After that, a signal current is inputted to perform the set operation. A predetermined potential can be obtained rapidly as the precharge operation is performed before the set operation. The predetermined potential is approximately equal to a potential after completing the set operation. Therefore, the set operation can be rapidly performed and a write operation of a signal current can be rapidly performed. By using two transistors, a gate width W can be long or a gate length L can be short in the precharge operation or the gate width W can be short and the gate length L can be long in the set operation. | 09-01-2011 |
20110233633 | Semiconductor Device and Electronic Apparatus Having the Same - With an offset circuit including transistors of the same conductivity type, offset of an input signal is performed. Then, the input signal after the offset is supplied to a logic circuit including transistors of the same conductivity type as that of the offset circuit, thereby H and L levels of the input signal can be shifted at the same time. Further, since the offset circuit and the logic circuit are formed using the transistors of the same conductivity type, a display device can be manufactured at a low cost. | 09-29-2011 |
20110234573 | SIGNAL LINE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE - Variations occur in the characteristics of transistors. The present invention is a signal-line drive circuit comprising first and second current source circuits corresponding to respective plurality of signal lines, a shift register, and n (n is a natural number of one or more) video-signal constant current source s, wherein each of the first and second current source circuits has a capacitance means and a supply means. The capacitance means held in one of the first and second source circuits converts a current including a current supplied from each of the n video-signal constant current source s to voltage in response to a sampling pulse supplied from the shift register and a latch pulse supplied from the exterior; and the supply means held in the other supplies a current responsive to the converted voltage. The values of the currents supplied from the n video-signal constant current source s are set to a proportion of 2 | 09-29-2011 |
20110248746 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - It is an object of the invention to provide a digital circuit which can operate normally regardless of binary potentials of an input signal. A semiconductor device having a correcting unit and a logic unit wherein the correcting unit includes a capacitor, first and second switches, wherein the first electrode of the capacitor is connected to the input terminal and the second electrode of the capacitor is connected to the gate of the transistor in the logic circuit, wherein the first switch controls the connection between a gate and drain of the transistor and the second switch controls the potential to be supplied to the drain of the transistor is provided. | 10-13-2011 |
20110254880 | SIGNAL LINE DRIVER CIRCUIT, LIGHT EMITTING DEVICE AND DRIVING METHOD THEREOF - Variation occurs in transistor characteristics. The present invention relates to a signal line driver circuit comprising a plurality of current source circuits respectively corresponding to a plurality of wirings, characterized in that: the plurality of current source circuits each comprise capacitor means and supply means; and the plurality of current source circuits each convert a supplied current into a voltage in accordance with a video signal, and supply a current corresponding to the converted voltage. | 10-20-2011 |
20110254984 | DEFECTIVE PIXEL SPECIFYING METHOD, DEFECTIVE PIXEL SPECIFYING SYSTEM, IMAGE CORRECTING METHOD, AND IMAGE CORRECTING SYSTEM - A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read. | 10-20-2011 |
20110259420 | PHOTOELECTRIC CONVERSION DEVICE AND MANUFACTURING METHOD THEREOF - It is an object to reduce the region of a photoelectric conversion element which light does not reach, to suppress deterioration of power generation efficiency, and to suppress manufacturing cost of a voltage conversion element. The present invention relates to a transmissive photoelectric conversion device which includes a photoelectric conversion element including an n-type semiconductor layer, an intrinsic semiconductor layer, and a p-type semiconductor layer; a voltage conversion element which is overlapped with the photoelectric conversion element and which includes an oxide semiconductor film for a channel formation region; and a conductive element which electrically connects the photoelectric conversion element and the voltage conversion element. The photoelectric conversion element is a solar cell. The voltage conversion element includes a transistor having a channel formation region including an oxide semiconductor film. The voltage conversion element is a DC-DC converter. | 10-27-2011 |
20110260170 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. By inputting a potential in accordance with a video signal into the pixel after the threshold voltage of the transistor is held in the storage capacitor, and holding a voltage of the sum of the threshold voltage and the potential, variations of a current value caused by variations of threshold voltage of a transistor can be suppressed. Consequently, a predetermined current can be supplied to the load such as a light-emitting element. Further, by changing the potential of a power supply line, a display device with a high duty ratio can be provided. | 10-27-2011 |
20110261293 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 10-27-2011 |
20110273021 | Photoelectric Conversion Device and Manufacturing Method Thereof - Generation of ripples and the decrease in the output voltage of a photoelectric conversion device are suppressed. The photoelectric conversion device includes a first photoelectric conversion element; a first voltage conversion element for converting the output voltage of the first photoelectric conversion element; a second photoelectric conversion element whose characteristic is different from the characteristic of the first photoelectric conversion element; a second voltage conversion element for converting the output voltage of the second photoelectric conversion element; and a control element for controlling timing of the first voltage conversion element and the second voltage conversion element. | 11-10-2011 |
20110273080 | DISPLAY DEVICE AND ELECTRONIC DEVICE - To improve color reproduction areas in a display device having light-emitting elements. A display region has a plurality of picture elements. Each picture element includes: first and second pixels each including a light-emitting element which has a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more; third and fourth pixels each including a light-emitting element which has a chromaticity whose y-coordinate in the diagram is 0.55 or more; and fifth and sixth pixels each including a light-emitting element which has a chromaticity whose x-coordinate and y-coordinate in the diagram are 0.20 or less and 0.25 or less, respectively. The light-emitting elements in the first and second pixels have different emission spectrums from each other; the light-emitting elements in the third and fourth pixels have different emission spectrums from each other; and the light-emitting elements in the fifth and sixth pixels have different emission spectrums from each other. | 11-10-2011 |
20110279441 | Display Device and Driving Method of the Same, and Electronic Apparatus - The brightness of a light emitting element varies when changes in ambient temperature or changes with time occur. In view of this, the invention provides a display device where the influence of variations in the current value of the light emitting element due to changes in ambient temperature and changes with time can be suppressed. The display device of the invention includes a monitoring element that is driven with a constant current, and a voltage applied to the monitoring element is detected and inputted to a light emitting element. In other words, the monitoring element is driven with a low current, and a voltage applied to the monitoring element is inputted to the light emitting element such that the light emitting element is driven with a constant current. | 11-17-2011 |
20110285930 | LIQUID CRYSTAL DISPLAY DEVICE - A semiconductor device or the like with low off-state current is provided. A semiconductor device or the like for displaying images accurately is provided. A display device or the like with a wide viewing angle is provided. A display device or the like in which image burn-in is suppressed is provided. In order to achieve any of the above objects, a circuit is formed using a transistor including an oxide semiconductor (OS), particularly a thin film MOS transistor including an oxide semiconductor. The oxide semiconductor is a substantially intrinsic semiconductor. Thus, the off-state current of the transistor is extremely low. | 11-24-2011 |
20110285931 | Liquid Crystal Display Device - It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer. | 11-24-2011 |
20110298082 | SEMICONDUCTOR INTEGRATED CIRCUIT AND METHOD OF DRIVING THE SAME - A transistor causes fluctuation in the threshold and mobility due to the factor such as fluctuation of the gate length, the gate width, and the gate insulating film thickness generated by the difference of the manufacturing steps and the substrate to be used. As a result, there is caused fluctuation in the current value supplied to the pixel due to the influence of the characteristic fluctuation of the transistor, resulting in generating streaks in the display image. A light emitting device is provided which reduces influence of characteristics of transistors in a current source circuit constituting a signal line driving circuit until the transistor characteristics do not affect the device and which can display a clear image with no irregularities. A signal line driving circuit of the present invention can prevent streaks in a displayed image and uneven luminance. Also, the present invention makes it possible to form elements of a pixel portion and driving circuit portion from polysilicon on the same substrate integrally. In this way, a display device with reduced size and current consumption is provided as well as electronic equipment using the display device. | 12-08-2011 |
20110309239 | Photoelectric Transducer Device - An object is to obtain a diode having a small voltage drop and to reduce the fabrication cost of a converter circuit. A photoelectric transducer device including: a photoelectric transducer element; and a converter circuit stepping up or stepping down an output of the photoelectric transducer element and including a switching element and a rectifier, in which the switching element is a first insulated gate bipolar transistor that is normally off and in which the rectifier is a second insulated gate bipolar transistor that is diode-connected and normally on. | 12-22-2011 |
20110316820 | Display Device - A method for reducing afterimages in a device for displaying images by application of an electric field to a charged substance is provided. A plurality of pixels each include a display element including a pixel electrode, a charged layer, and a counter electrode. The display device has a function of applying different potentials to pixel electrodes that are adjacent to each other in a period during which the pixels are initialized. Thus, electric fields are generated not only in a direction perpendicular to the pixel electrodes but also in a direction parallel to the pixel electrodes (the end-face direction of the pixel electrodes), so that charged substances in the charged layer stir. Accordingly, aggregation can be prevented. | 12-29-2011 |
20110317250 | Display Device - In a device for displaying images by application of an electric field to a charged substance, a structure for reducing afterimages and a method for manufacturing the structure are provided. The device is a display device which includes a plurality of pixel electrodes and a charged layer (a layer including a charged substance) provided over the pixel electrodes. An end of one of two pixel electrodes that are adjacent to each other among the plurality of pixel electrodes has a depression in an end-face direction, and an end of the other of the pixel electrodes has a projection in the end-face direction. In a state in which the depression and the projection are in a set, a gap is formed between the two pixel electrodes. | 12-29-2011 |
20120019222 | Photoelectric Transducer Device - An object is to obtain a rectifier having a small voltage drop and to reduce the fabrication cost of a converter circuit. A photoelectric transducer device including: a photoelectric transducer element; and a converter circuit stepping up or stepping down an output of the photoelectric transducer element and including a switching element and a rectifier, in which the switching element is a first oxide semiconductor transistor that is normally off and in which the rectifier is a second oxide semiconductor transistor that is diode-connected and normally on. | 01-26-2012 |
20120025876 | Current Driving Circuit and Display Device Using The Current Driving Circuit - A current drive circuit which can improve a rate for signal writing and a driving rate of an element even when a signal current is small, and a display device using the current drive circuit are provided. The current drive circuit for supplying a signal current to a node of a driven circuit through a signal line includes a precharge function for supplying a precharge voltage to the node through the signal line and the precharge function includes a supply function for supplying the precharge voltage to the node and the signal line prior to supplying the signal current. | 02-02-2012 |
20120032943 | Semiconductor Device, and Display Device and Electronic Device Utilizing the Same - A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor | 02-09-2012 |
20120056550 | DISPLAY DEVICE - The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern. | 03-08-2012 |
20120056862 | DISPLAY DEVICE AND ELECTRONIC APPARATUS - To provide a display device whose display can be recognized even in dark places or under the strong outside light. The display device performs display by controlling the number of gray scales in accordance with the intensity of outside light, which means a display mode can be switched in accordance with the data to be displayed on the display screen. A video signal generation circuit is controlled in each display mode in such a manner that it directly outputs an input video signal with an analog value, outputs a signal with a binary digital value, or outputs a signal with a multivalued digital value. As a result, gray scales displayed in pixels are timely changed. Accordingly, clear images can be displayed while maintaining high visibility in various environments, in the wide range from, for example, dark places or indoors (e.g., under a fluorescent lighting) to outdoors (e.g., under the sunlight). | 03-08-2012 |
20120062528 | SEMICONDUCTOR DEVICE - A semiconductor device where delay or distortion of a signal output to a gate signal line in a selection period is reduced is provided. The semiconductor device includes a gate signal line, a first and second gate driver circuits which output a selection signal and a non-selection signal to the gate signal line, and pixels electrically connected to the gate signal line and supplied with the two signals. In a period during which the gate signal line is selected, both the first and second gate driver circuits output the selection signal to the gate signal line. In a period during which the gate signal line is not selected, one of the first and second gate driver circuits outputs the non-selection signal to the gate signal line, and the other gate driver circuit outputs neither the selection signal nor the non-selection signal to the gate signal line. | 03-15-2012 |
20120074985 | SEMICONDUCTOR DEVICE - In the case where data is rewritten in a delay period of a signal in a flip flop and a shift register which use an inverted clock signal, current inhibiting charging may flow, whereby data cannot written quickly, so that charging is not completed, which makes operation unstable. In view of the above, a flip flop and a shift register without using an inverted clock signal, which have high stability are provided. Current inhibiting charging of a node where that current inhibiting charging flows is cut off at the time of rewriting data so that data is rewritten quickly. | 03-29-2012 |
20120086012 | LIQUID CRYSTAL DISPLAY DEVICE - A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 04-12-2012 |
20120086061 | Semiconductor Device - A semiconductor device with a transistor for supplying a current to a pixel comprising an EL element, that can supply an accurate current without the influence of variations even when a small signal current, is provided. A precharge voltage is supplied in advance for the current supply to a pixel and subsequently, the signal writing is completed quickly. The precharge voltage is outputted from a circuit for supplying voltage and current that supplies a current to a current source circuit for supplying a current to the pixel. As the precharge voltage, a gate voltage of a transistor for supplying a current to the current source circuit is supplied to the pixel. Optimum precharge voltage can be supplied in the case where W/L of a transistor in the pixel and W/L of a transistor for supplying current in the circuit for supplying voltage and current are approximately equivalent to each other. | 04-12-2012 |
20120086692 | Electric Circuit - As for a transistor, overlapped are factors such as a variation of a gate insulation film which occurs due to a difference of a manufacturing process and a substrate used and a variation of a crystalline state in a channel forming region and thereby, there occurs a variation of a threshold voltage and mobility of a transistor. | 04-12-2012 |
20120098738 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - It is an object of the present invention to provide a display device in which problems such as an increase of power consumption and increase of a load of when light is emitted are reduced by using a method for realizing pseudo impulsive driving by inserting an dark image, and a driving method thereof. A display device which displays a gray scale by dividing one frame period into a plurality of subframe periods, where one frame period is divided into at least a first subframe period and a second subframe period; and when luminance in the first subframe period to display the maximum gray scale is Lmax | 04-26-2012 |
20120100890 | DEFECTIVE PIXEL SPECIFYING METHOD, DEFECTIVE PIXEL SPECIFYING SYSTEM, IMAGE CORRECTING METHOD, AND IMAGE CORRECTING SYSTEM - A defective pixel specifying method and a defective pixel specifying system for a semiconductor device having a defective pixel are provided. Also provided are an image correcting method and an image correcting system for making a defective pixel inconspicuous on the screen when a read image is displayed. The present invention determines whether or not there is a defective pixel for each pixel and specifies the coordinate of the defective pixel using image signals obtained by reading a plurality of images. The image signal of the defective pixel is set based on the image signals of the pixels adjacent to the defective pixel to correct the image of the subject read. | 04-26-2012 |
20120120126 | LIGHT EMITTING DEVICE AND PRODUCTION SYSTEM OF THE SAME - To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained. | 05-17-2012 |
20120139440 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS USING THE SAME - The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source. | 06-07-2012 |
20120154456 | DISPLAY DEVICE, DRIVING METHOD OF DISPLAY DEVICE, AND ELECTRONIC APPLIANCE - A semiconductor device including a plurality of pixels over a substrate and a display medium including an electronic ink over the substrate, in which at least one pixel of the plurality of pixels comprises first and second subpixels each of which comprises a transistor that comprises an oxide semiconductor including indium, and in which one image of at least one of the plurality of pixels is displayed by a plurality of signals, is provided. | 06-21-2012 |
20120154726 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPARATUS - The present invention provides a liquid crystal display device including a liquid crystal layer disposed between a first substrate and a second substrate, a pixel electrode in a reflection region and a transmission region over the first substrate, a film for adjusting a cell gap in the reflection region over the first substrate, and an opposite electrode in the reflection region and the transmission region over the second substrate. The pixel electrode in the reflection region is provided over the film and reflects light. The pixel electrode in the transmission region transmits light. The pixel electrode in the reflection region and the transmission region includes a slit. The slit is overlapped with at least a part of a step portion which is provided by the film between the reflection region and the transmission region. | 06-21-2012 |
20120162561 | Liquid Crystal Display Device And Electronic Device - To provide a semiconductor device, a liquid crystal display device, and an electronic device which have a wide viewing angle and in which the number of manufacturing steps, the number of masks, and manufacturing cost are reduced compared with a conventional one. The liquid crystal display device includes a first electrode formed over an entire surface of one side of a substrate; a first insulating film formed over the first electrode; a thin film transistor formed over the first insulating film; a second insulating film formed over the thin film transistor; a second electrode formed over the second insulating film and having a plurality of openings; and a liquid crystal over the second electrode. The liquid crystal is controlled by an electric field between the first electrode and the second electrode. | 06-28-2012 |
20120170784 | DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - It is an object of the present invention to form a pixel electrode and a metal film using one resist mask in manufacturing a stacked structure by forming the metal film over the pixel electrode. A conductive film to be a pixel electrode and a metal film are stacked. A resist pattern having a thick region and a region thinner than the thick region is formed over the metal film using an exposure mask having a semi light-transmitting portion. The pixel electrode, and the metal film formed over part of the pixel electrode to be in contact therewith are formed using the resist pattern. Accordingly, a pixel electrode and a metal film can be formed using one resist mask. | 07-05-2012 |
20120175619 | DISPLAY DEVICE - A structure for preventing deteriorations of a light-emitting device and retaining sufficient capacitor elements (condenser) required by each pixel is provided. A first passivation film, a second metal layer, a flattening film, a barrier film, and a third metal layer are stacked in this order over a transistor. A side face of a first opening provided with the flattening film is covered by the barrier film, a second opening is formed inside the first opening, and a third metal layer is connected to a semiconductor via the first opening and the second opening. A capacitor element that is formed of a lamination of a semiconductor of a transistor, a gate insulating film, a gate electrode, the first passivation film, and the second metal layer is provided. | 07-12-2012 |
20120182598 | METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE - A method for manufacturing a semiconductor device includes: forming a photocatalytic layer and an organic compound layer in contact with the photocatalytic layer over a substrate having a light transmitting property; forming an element forming layer over the substrate having the light transmitting property with the photocatalytic layer and the organic compound layer in contact with the photocatalytic layer interposed therebetween; and separating the element forming layer from the substrate having the light transmitting property after the photocatalytic layer is irradiated with light through the substrate having the light transmitting property. | 07-19-2012 |
20120188466 | Semiconductor Device, Display Device, And Electronic Device - A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. By inputting a potential in accordance with a video signal into the pixel after the threshold voltage of the transistor is held in the storage capacitor, and holding a voltage of the sum of the threshold voltage and the potential, variations of a current value caused by variations of threshold voltage of a transistor can be suppressed. Consequently, a predetermined current can be supplied to the load such as a light-emitting element. Further, by changing the potential of a power supply line, a display device with a high duty ratio can be provided. | 07-26-2012 |
20120194412 | Display device, Electronic Device and Method of Driving Display Device - The present invention provides a display device which can display characters clearly and display images smoothly. An area gray scale method is adopted and a configuration of one pixel is changed depending on a mode, by selecting one or more display regions in each pixel. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. Thus, clear display can be conducted. When images are needed to be displayed, one pixel is configured by selecting an indented state. Thus, smooth display can be conducted. | 08-02-2012 |
20120194749 | DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - It is an object to provide a display device in which a problem of light leakage from a liquid crystal element in black display is reduced or overcome and the contrast is improved. It is another object to provide a pixel circuit having a function to control a lighting state of a backlight based on each pixel. These objects are achieved by turning off a light-emitting element in display of a black gray scale, and by providing a light-emitting element in each pixel and providing, in a pixel circuit, a function to individually control lighting and non-lighting of the light-emitting element depending on a gray scale to perform display. When a backlight is provided in each pixel, a light-emitting element that is a backlight is turned off when a black gray scale is displayed, whereby reduction in contrast due to light leakage from a liquid crystal element can be prevented. | 08-02-2012 |
20120194758 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode. | 08-02-2012 |
20120199831 | LIQUID CRYSTAL DISPLAY DEVICE - To provide a liquid crystal display device having high visibility and high image quality by relieving color phase irregularity. A light-shielding layer is selectively provided so as to overlap with a contact hole for electrical connection to a source region or a drain region of a thin film transistor. Alternatively, by providing an opening portion of a colored layer (color filter) with an opening so as to overlap with a contact hole, uneven alignment of liquid crystal molecules does not influence display, and a liquid crystal display having high image quality can be provided. | 08-09-2012 |
20120200612 | Driving Method of Display Device - Pseudo contours occur in a display device that expresses a gray scale by dividing one frame into a plurality of subframes and using a time gray scale method. In the case of expressing a high-order bit, a gray scale is expressed by sequentially adding the weight (light emitting period, frequency of light emission, and the like) in each subframe. On the other hand, in the case of expressing a low-order bit, a gray scale is expressed by selecting a subframe where light is emitted. Then, subframes for a high-order bit and subframes for a low-order bit are not to be unevenly distributed in a specific place in one frame. | 08-09-2012 |
20120212686 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 08-23-2012 |
20120235974 | SIGNAL LINE DRIVER CIRCUIT AND LIGHT EMITTING DEVICE AND DRIVING METHOD THEREFOR - The variation of characteristics of transistors occurs. The present invention is a signal line drive circuit having a plurality of current source circuit corresponding to a plurality of wirings, a first and a second shift registers, a latch circuit, the foregoing plurality of current source circuits have capacity means and supplying means, respectively, characterized in that the foregoing capacity means converts a supplied current into a voltage according to a sampling pulse supplied from the foregoing first shift register, the foregoing supplying means supplies a current corresponding to the foregoing converted voltage according to a video signal, and the foregoing latch circuit operates according to a sampling pulse supplied from the foregoing second shift register. | 09-20-2012 |
20120236224 | LIQUID CRYSTAL DISPLAY DEVICE - To suppress a malfunction of a circuit due to deterioration in a transistor. In a transistor which continuously outputs signals having certain levels (e.g., L-level signals) in a pixel or a circuit, the direction of current flowing through the transistor is changed (inverted). That is, by changing the level of voltage applied to a first terminal and a second terminal (terminals serving as a source and a drain) every given period, the source and the drain are switched every given period. Specifically, in a portion which successively outputs signals having certain levels (e.g., L-level signals) in a circuit including a transistor, L-level signals having a plurality of different potentials (L-level signals whose potentials are changed every given period) are used as the signals having certain levels. | 09-20-2012 |
20120242563 | DISPLAY DEVICE AND ELECTRONIC DEVICE - It is an object of the present invention to provide a display device in which a reverse current sufficient enough to insulate a short-circuited point flows and a transistor using amorphous silicon is used is applied. The display device includes a switching transistor that controls an input of a video signal, a driving transistor that controls a current flowing in a forward direction to a light emitting element, and an AC transistor that controls a current flowing in a reverse direction to the light emitting element; and a reverse bias current can be applied to the light emitting element. Furthermore, the above-described transistors are N-channel transistors. | 09-27-2012 |
20120249907 | LIQUID CRYSTAL DISPLAY DEVICE - To improve viewing angle characteristics by varying voltage which is applied between liquid crystal elements. A liquid crystal display device in which one pixel is provided with three or more liquid crystal elements and the level of voltage which is applied is varied between the liquid crystal elements is varied. In order to vary the level of the voltage which is applied between the liquid crystal elements, an element which divides the applied voltage is provided. In order to vary the level of the applied voltage, a capacitor, a resistor, a transistor, or the like is used. Viewing angle characteristics can be improved by varying the level of the voltage which is applied between the liquid crystal elements. | 10-04-2012 |
20120256896 | DISPLAY MODULE, AND CELLULAR PHONE AND ELECTRONIC DEVICE PROVIDED WITH DISPLAY MODULE - It is an object to achieve downsizing and a thin shape of a display module and an electronic device provided with the display module. The display module includes a first display panel in which a first display screen is formed on one main side; and a second display panel that is smaller than and overlapped with the first display panel, in which a second display screen is formed on an opposite side of the one main side. The display module includes, over a sealing substrate of the first display panel and/or the second display panel, at least one integrated circuit, which is connected to input terminals of the first display panel and the second display panel and controls operation of the both panels, arranged in a peripheral portion of the second display panel, which is a surface on an opposite side of a display surface of the first display panel. | 10-11-2012 |
20120273810 | Booster Circuit, Semiconductor Device, and Electronic Apparatus - The invention provides a booster circuit including a first transistor, a second transistor, a first capacitor element, a second capacitor element, a diode, and an inverter, wherein one electrode of the first transistor is maintained at a predetermined potential, the output of the inverter is connected to the gate electrode of the first transistor and one electrode of the second transistor through the second capacitor element, the input of the inverter is connected to the other electrode of the first transistor through the first capacitor element and connected to the gate electrode of the second transistor, and the diode is connected between the other electrode of the first transistor and the other electrode of the second transistor so as to be forwardly biased. | 11-01-2012 |
20120274614 | Driving Method of Display Device - In a display device in which one frame is divided into a plurality of subframes and a gray scale is expressed by a time gray scale method, there is a problem of pseudo contour. A gray scale is expressed by sequentially adding a weight of each subframe (light emission period, light emission time, and the like). Further, an erasing diode is provided in a pixel. By turning this erasing diode on, the signal stored in the pixel is erased, thereby a non-light emission period is provided. Accordingly, subframes with different light emission periods can be easily formed. | 11-01-2012 |
20120274879 | METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE - The present invention provides a manufacturing technique of a semiconductor device and a display device using a peeling process, in which a transfer process can be conducted with a good state in which a shape and property of an element before peeling are kept. Further, the present invention provides a manufacturing technique of more highly reliable semiconductor devices and display devices with high yield without complicating the apparatus and the process for manufacturing. According to the present invention, an organic compound layer including a photocatalyst substance is formed over a first substrate having a light-transmitting property, an element layer is formed over the organic compound layer including a photocatalyst substance, the organic compound layer including a photocatalyst substance is irradiated with light which has passed through the first substrate, and the element layer is peeled from the first substrate. | 11-01-2012 |
20120280238 | Semiconductor Device and Method for Manufacturing the Same - A semiconductor device includes a pixel electrode and a transistor which includes a first gate electrode, a first insulating layer over the first gate electrode, a semiconductor layer over the first insulating layer, a second insulating layer over the semiconductor layer, and a second gate electrode. The pixel electrode and the second gate electrode are provided over the second insulating layer. The first gate electrode has a region overlapping with the semiconductor layer with the first insulating layer provided therebetween. The second gate electrode has a region overlapping with the semiconductor layer with the second insulating layer provided therebetween. A first region is at least part of a region where the second gate electrode overlaps with the semiconductor layer. A second region is at least part of a region where the pixel electrode is provided. The second insulating layer is thinner in the first region than in the second region. | 11-08-2012 |
20120286697 | SEMICONDUCTOR DEVICE - A semiconductor device in which a transistor can supply an accurate current to a load (EL pixel and signal line) without being influenced by variations is provided. | 11-15-2012 |
20120299029 | DISPLAY DEVICE - It is an object to provide a highly reliable display device. It is a feature an IC is over a substrate and a material layer having the same height is thereover. An IC is provided on one side of the substrate, and a material layer having the same height as the IC is provided on at least another side. Further, an IC is provided on one side of the substrate, and material layers having the same height as the IC are provided on the other sides. Further, an IC is provided on one side of the substrate, and a material layer having the same height as the IC is provided at a corner of the substrate. | 11-29-2012 |
20120299885 | Semiconductor Device, Electronic Device Having the Same, and Driving Method of the Same - A digital circuit which can operate normally regardless of binary potentials of an input signal is provided. A semiconductor device comprising a correcting unit and one or a plurality of circuit elements, the correcting unit including a first capacitor, a second capacitor, a first switch, and a second switch, wherein the first electrode of the first capacitor is connected to an input terminal, the supply of a first potential to the second electrode of the first capacitor is controlled by the first switch, the supply of a second potential to the second electrode of the second capacitor is controlled by the second switch, and a potential of the second electrode of the first capacitor or a potential of the second electrode of the second capacitor is supplied to the one or the plurality of circuit elements. | 11-29-2012 |
20120299987 | LIGHT EMITTING DEVICE AND PRODUCTION SYSTEM OF THE SAME - To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained. | 11-29-2012 |
20120305923 | DISPLAY DEVICE - The inventors found out that in the case of performing a low gray scale display in which a very small amount of current is supplied to a light emitting element, variations in threshold voltages of driving transistors become notable since the gate-source voltage is low. In view of this, the invention provides a display device in which variations in the threshold voltages of the driving transistors are reduced even in the low gray scale display, and a driving method thereof. According to the invention, a gate-source voltage of the driving transistor is set higher in the low gray scale display than that in the high gray scale display. As one mode to achieve this, different power source lines are provided for the low gray scale display and the high gray scale display and their potentials are set to be different. | 12-06-2012 |
20120306838 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS USING THE SAME - The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source. | 12-06-2012 |
20120320296 | DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - A display device which has one memory in each pixel is disclosed and claimed. Each of the pixels further comprises three transistors and a display element and is connected with four wirings. One of the four wirings is a scanning line and others are signal lines. One electrode of the display element is connected with a first signal line and with the second signal line via the first transistor and via the second transistor, respectively, while the memory is connected with the third signal line via the third transistor. Further, the gate electrodes of the first and second transistors are connected with two terminals of the memory. | 12-20-2012 |
20120320663 | MEMORY DEVICE AND SEMICONDUCTOR DEVICE - A memory device with low power consumption is provided. A memory device includes a first logic element generating an output potential by inverting a polarity of a potential of a signal including data in accordance with a first clock signal; second and third logic elements holding the output potential generated by the first logic element; a switching element including a transistor; and a capacitor storing the data by being supplied with the output potential of the first logic element which is held by the second and third logic elements via the switching element. The second logic element generates an output potential by inverting a polarity of an output potential of the third logic element in accordance with a second clock signal different from the first clock signal, and the third logic element generates an output potential by inverting a polarity of the output potential of the second logic element. | 12-20-2012 |
20120327142 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A display device includes a load, a transistor for controlling a current value supplied to the load, a capacitor, a first wiring, a second wiring, and first to fourth switches. Variations in the current value caused by variations in the threshold voltage of the transistor can be suppressed through the steps of: (1) holding the threshold voltage of the transistor in the storage capacitor, (2) inputting a potential in accordance with a video signal, and (3) holding a voltage that is the sum of the threshold voltage and the potential in accordance with the video signal, in the storage capacitor. Accordingly, a desired current can be supplied to the load such as a light emitting element. | 12-27-2012 |
20130002125 | Display Device and Electronic Device - To improve color reproduction areas in a display device having light-emitting elements. A display region has a plurality of picture elements. Each picture element includes: first and second pixels each including a light-emitting element which has a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more; third and fourth pixels each including a light-emitting element which has a chromaticity whose y-coordinate in the diagram is 0.55 or more; and fifth and sixth pixels each including a light-emitting element which has a chromaticity whose x-coordinate and y-coordinate in the diagram are 0.20 or less and 0.25 or less, respectively. The light-emitting elements in the first and second pixels have different emission spectrums from each other; the light-emitting elements in the third and fourth pixels have different emission spectrums from each other; and the light-emitting elements in the fifth and sixth pixels have different emission spectrums from each other. | 01-03-2013 |
20130003269 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - To reduce adverse effect of variations in threshold voltage. A semiconductor device includes a transistor including a gate connected to one electrode of a capacitor and one terminal of a SW | 01-03-2013 |
20130009194 | LIGHT-EMITTING MODULE, LIGHT-EMITTING DEVICE, AND METHOD FOR MANUFACTURING THE LIGHT-EMITTING MODULE - A highly reliable light-emitting module or light-emitting device is provided. A method for manufacturing a highly reliable light-emitting module is provided. The light-emitting module includes, between a first substrate and a second substrate, a first electrode provided over the first substrate, a second electrode provided over the first electrode with a layer containing a light-emitting organic compound interposed therebetween, and a sacrifice layer formed using a liquid material provided over the second electrode. | 01-10-2013 |
20130027282 | Semiconductor Device and Display Device - An object of the present invention is to decrease the resistance of a power supply line, to suppress a voltage drop in the power supply line, and to prevent defective display. A connection terminal portion includes a plurality of connection terminals. The plurality of connection terminals is provided with a plurality of connection pads which is part of the connection terminal. The plurality of connection pads includes a first connection pad and a second connection pad having a line width different from that of the first connection pad. Pitches between the plurality of connection pads are equal to each other. | 01-31-2013 |
20130032806 | SEMICONDUCTOR DEVICE - Adverse effects of variation in threshold voltage are reduced. In a semiconductor device, electric charge is accumulated in a capacitor provided between a gate and a source of a transistor, and then, the electric charge accumulated in the capacitor is discharged; thus, the threshold voltage of the transistor is obtained. After that, current flows to a load. In the semiconductor device, the potential of one terminal of the capacitor is set higher than the potential of a source line, and the potential of the source line is set lower than the potential of a power supply line and the cathode side potential of the load. | 02-07-2013 |
20130032867 | SIGNAL LINE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE - The invention relates to a signal line driving circuit having a first and a second current source circuits, a shift register, and a constant current source for video signal, in which the first current source circuit is disposed in a first latch and the second current source circuit is disposed in a second latch. The first current source circuit includes capacitive means for converting the current supplied from the constant current source for video signal into a voltage, according to a sampling pulse supplied from the shift register, and supplying means for supplying the current corresponding to the converted voltage. | 02-07-2013 |
20130033470 | Driving Method of Semiconductor Device - The semiconductor device includes a transistor and a capacitor element which is electrically connected to a gate of the transistor. Charge held in the capacitor element according to total voltage of voltage corresponding to the threshold voltage of the transistor and image signal voltage is once discharged through the transistor, so that variation in current flowing in the transistor or mobility of the transistor can be reduced. | 02-07-2013 |
20130043911 | Semiconductor Device and Electronic Device Including Semiconductor Device - It is an object to suppress deterioration in characteristics of a transistor in a driver circuit. A driver circuit includes a first transistor, a second transistor including a gate and one of a source and a drain to which a second signal is inputted, a third transistor whose gate is electrically connected to one of a source and a drain of the first transistor and which controls whether a voltage state of an output signal is set or not by being turned on/off, and a fourth transistor whose gate is electrically connected to the other of the source and the drain of the second transistor and which controls whether a voltage state of an output signal is set or not by being turned on/off. | 02-21-2013 |
20130057345 | Analog Circuit and Display Device and Electronic Device - The invention provides an analog circuit that decreases an effect of variation of a transistor. By flowing a bias current in a compensation operation, a voltage between the gate and source of the transistor to be compensated is held in a capacitor. In a normal operation, the voltage stored in the compensation operation is added to a signal voltage. As the capacitor holds the voltage according to the characteristics of the transistor to be compensated, the effect of variation can be decreased by adding the voltage stored in the capacitor to the signal voltage. Further, an analog circuit which decreases the/effect of variation can be provided by applying the aforementioned basis to a differential circuit, an operational amplifier and the like. | 03-07-2013 |
20130057798 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPARATUS - The present invention provides a liquid crystal display device including a liquid crystal layer disposed between a first substrate and a second substrate, a pixel electrode in a reflection region and a transmission region over the first substrate, a film for adjusting a cell gap in the reflection region over the first substrate, and an opposite electrode in the reflection region and the transmission region over the second substrate. The pixel electrode in the reflection region is provided over the film and reflects light. The pixel electrode in the transmission region transmits light. The pixel electrode in the reflection region and the transmission region includes a slit. The slit is overlapped with at least a part of a step portion which is provided by the film between the reflection region and the transmission region. | 03-07-2013 |
20130063041 | SEMICONDUCTOR DEVICE - A semiconductor device includes a transistor, a light-emitting element, a first wiring, a driver circuit having a function of controlling the potential of the first wiring, a second wiring, a first switch, a second switch, a third switch, a fourth switch, a first capacitor, and a second capacitor. One of a source and a drain of the transistor is connected to the light-emitting element. With this structure, voltage applied between the source and the gate of the transistor can be corrected in anticipation of variations in threshold voltage, so that the current supplied to the light-emitting element can be corrected. | 03-14-2013 |
20130070000 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - It is an object of the present invention to provide a display device in which problems such as an increase of power consumption and increase of a load of when light is emitted are reduced by using a method for realizing pseudo impulsive driving by inserting an dark image, and a driving method thereof. A display device which displays a gray scale by dividing one frame period into a plurality of subframe periods, where one frame period is divided into at least a first subframe period and a second subframe period; and when luminance in the first subframe period to display the maximum gray scale is Lmax1 and luminance in the second subframe period to display the maximum gray scale is Lmax2, (½) Lmax203-21-2013 | |
20130070174 | Liquid Crystal Display Device and Driving Method Thereof - To provide a hold-type display device without a problem of motion blur and a driving method thereof. The length of a period for displaying a blanking image in one frame period is controlled in accordance with a control parameter showing the degree of motion blur, and the level of a signal supplied to a display element is changed in accordance with the length of the period for displaying the blanking image. Accordingly, the hold-type display device without a problem of motion blur and the driving method thereof can be provided. | 03-21-2013 |
20130077011 | LIQUID CRYSTAL DISPLAY DEVICE - A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 03-28-2013 |
20130092930 | SEMICONDUCTOR DEVICE - A semiconductor device that is less influenced by variations in characteristics between transistors or variations in a load, and is efficient even for normally-on transistors is provided. The semiconductor device includes at least a transistor, two wirings, three switches, and two capacitors. A first switch controls conduction between a first wiring and each of a first electrode of a first capacitor and a first electrode of a second capacitor. A second electrode of the first capacitor is connected to a gate of the transistor. A second switch controls conduction between the gate and a second wiring. A second electrode of the second capacitor is connected to one of a source and a drain of the transistor. A third switch controls conduction between the one of the source and the drain and each of the first electrode of the first capacitor and the first electrode of the second capacitor. | 04-18-2013 |
20130092963 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A load, a transistor which controls a current value supplied to the load, a capacitor, a power supply line, and first to third switches are provided. After a threshold voltage of the transistor is held by the capacitor, a potential in accordance with a video signal is inputted and a voltage that is the sum of the threshold voltage and the potential is held. Accordingly, variation in current value caused by variation in threshold voltage of the transistor can be suppressed. Therefore, a desired current can be supplied to a load such as a light emitting element. In addition, a display device with a high duty ratio can be provided by changing a potential of the power supply line. | 04-18-2013 |
20130092990 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE AND ELECTRONIC DEVICE - When writing a signal current from a current source to a current source circuit, noise occurs in some cases in a wiring through which a current flows, which may cause a potential of the wiring to be outside the normal range. As the potential does not turn back within the normal range easily at this time, writing to the current source circuit is delayed. According to the invention, when the potential becomes outside the normal range due to noise occurring in a wiring through which a current flows when writing a signal current from a current source to a current source circuit, a current is supplied from other than the current source, thereby the potential of the wiring can turn back within the normal range rapidly. | 04-18-2013 |
20130095588 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a pixel portion having a first thin film transistor and a driver circuit having a second thin film transistor. Each of the first thin film transistor and the second thin film transistor includes a gate electrode layer, a gate insulating layer, a semiconductor layer, a source electrode layer, and a drain electrode layer. Each of the layers of the first thin film transistor has a light-transmitting property. Materials of the gate electrode layer, the source electrode layer and the drain electrode layer of the first thin film transistor are different from those of the second transistor, and each of the resistances of the second thin film transistor is lower than that of the first thin film transistor. | 04-18-2013 |
20130099832 | Current Driving Circuit and Display Device Using The Current Driving Circuit - A current drive circuit which can improve a rate for signal writing and a driving rate of an element even when a signal current is small, and a display device using the current drive circuit are provided. The current drive circuit for supplying a signal current to a node of a driven circuit through a signal line includes a precharge function for supplying a precharge voltage to the node through the signal line and the precharge function includes a supply function for supplying the precharge voltage to the node and the signal line prior to supplying the signal current. | 04-25-2013 |
20130126879 | SEMICONDUCTOR DEVICE, DRIVING METHOD THEREOF AND ELECTRONIC DEVICE - The invention provides a semiconductor device having a current input type pixel in which a signal write speed is increased and an effect of variations between adjacent transistors is reduced. When a set operation is performed (write a signal), a source-drain voltage of one of two transistors connected in series becomes quite low, thus the set operation is performed to the other transistor. In an output operation, the two transistors operate as a multi-gate transistor, therefore, a current value in the output operation can be small. In other words, a current in the set operation can be large. Therefore, an effect of intersection capacitance and wiring resistance which are parasitic on a wiring and the like do not affect much, thereby the set operation can be performed rapidly. As one transistor is used in the set operation and the output operation, an effect of variations between adjacent transistors is lessened. | 05-23-2013 |
20130128174 | Liquid Crystal Display Device And Semiconductor Device - By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode. | 05-23-2013 |
20130135183 | Display Device, Electronic Device and Method of Driving Display Device - The present invention provides a display device which can display characters clearly and display images smoothly. An area gray scale method is adopted and a configuration of one pixel is changed depending on a mode, by selecting one or more display regions in each pixel. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. Thus, clear display can be conducted. When images are needed to be displayed, one pixel is configured by selecting an indented state. Thus, smooth display can be conducted. | 05-30-2013 |
20130135550 | Digital Circuit Having Correcting Circuit and Electronic Apparatus Thereof - Provided is a digital circuit ( | 05-30-2013 |
20130146882 | SEMICONDUCTOR DEVICE AND ELECTRONIC DEVICE - An object is to improve the drive capability of a semiconductor device. The semiconductor device includes a first transistor and a second transistor. A first terminal of the first transistor is electrically connected to a first wiring. A second terminal of the first transistor is electrically connected to a second wiring. A gate of the second transistor is electrically connected to a third wiring. A first terminal of the second transistor is electrically connected to the third wiring. A second terminal of the second transistor is electrically connected to a gate of the first transistor. A channel region is formed using an oxide semiconductor layer in each of the first transistor and the second transistor. The off-state current of each of the first transistor and the second transistor per channel width of 1 μm is 1 aA or less. | 06-13-2013 |
20130153909 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - A voltage equal to the threshold value of a TFT ( | 06-20-2013 |
20130157393 | SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD OF THE SAME - An object is to provide a semiconductor device with high aperture ratio or a manufacturing method thereof. Another object is to provide semiconductor device with low power consumption or a manufacturing method thereof. A light-transmitting conductive layer which functions as a gate electrode, a gate insulating film formed over the light-transmitting conductive layer, a semiconductor layer formed over the light-transmitting conductive layer which functions as the gate electrode with the gate insulating film interposed therebetween, and a light-transmitting conductive layer which is electrically connected to the semiconductor layer and functions as source and drain electrodes are included. | 06-20-2013 |
20130181223 | ELECTRIC CIRCUIT - A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor. | 07-18-2013 |
20130187701 | SEMICONDUCTOR DEVICE AND DRIVING METHOD OF THE SAME - In the case of reducing an effect of variations in current characteristics of transistors by inputting a signal current to a transistor in a pixel, a potential of a wiring is detected by using a precharge circuit. In the case where there is a difference between a predetermined potential and the potential of the wiring, a charge is supplied to the wiring to perform a precharge by charging rapidly. When the potential of the wiring reaches the predetermined potential, the supply of charge is stopped and a signal current only is supplied. Thus, a precharge is performed only in a period until the potential of the wiring reaches the predetermined potential, therefore, a precharge can be performed for an optimal period. | 07-25-2013 |
20130215369 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPLIANCE - A pixel electrode or a common electrode is a light-transmissive conductive film; therefore, it is formed of ITO conventionally. Accordingly, the number of manufacturing steps and masks, and manufacturing cost have been increased. An object of the present invention is to provide a semiconductor device, a liquid crystal display device, and an electronic appliance each having a wide viewing angle, less numbers of manufacturing steps and masks, and low manufacturing cost compared with a conventional device. A semiconductor layer of a transistor, a pixel electrode, and a common electrode of a liquid crystal element are formed in the same step. | 08-22-2013 |
20130249857 | SEMICONDUCTOR DEVICE AND ELECTRONIC DEVICE - A semiconductor device includes a first wiring; a first switch having a function of controlling electrical connection between the first wiring and first and second capacitors; a second wiring; a transistor electrically connected to the second wiring and the first capacitor; a second switch having a function of controlling electrical connection between a gate and a source or a drain of the transistor; a third switch having a function of controlling electrical connection between the transistor and the first and second capacitors; a fourth switch having a function of controlling electrical connection between the second capacitor and the transistor; a third wiring; and a fifth switch having a function of controlling electrical connection between the third wiring and the second capacitor so that an operation defect of the semiconductor device can be prevented. | 09-26-2013 |
20130256672 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 10-03-2013 |
20130260509 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a substrate having an insulating surface; a light-transmitting first electrode provided over the substrate; a light-transmitting second electrode provided over the substrate; a light-transmitting semiconductor layer provided so as to be electrically connected to the first electrode and the second electrode; a first wiring electrically connected to the first electrode; an insulating layer provided so as to cover at least the semiconductor layer; a light-transmitting third electrode provided over the insulating layer in a region overlapping with the semiconductor layer; and a second wiring electrically connected to the third electrode. | 10-03-2013 |
20130264574 | SEMICONDUCTOR DEVICE, AND DISPLAY DEVICE AND ELECTRONIC DEVICE USING THE SAME - A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor | 10-10-2013 |
20130265518 | LIQUID CRYSTAL DISPLAY DEVICE - A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions. | 10-10-2013 |
20130271688 | DISPLAY DEVICE - The time taken to write a signal to a pixel is shortened in a display device. Further, a signal is written at high speed even when high voltage is applied. The display device includes a pixel including a transistor and a liquid crystal element electrically connected to a source or a drain of the transistor. The transistor includes an intrinsic or substantially intrinsic oxide semiconductor as a semiconductor material and has an off-state current of 1×10 | 10-17-2013 |
20130277549 | ANALYSIS APPARATUS AND ANALYSIS METHOD - A compound contained in a sample is analyzed more accurately. Provided is an analysis method using TOF-SIMS in which first spectral data is obtained by irradiating the sample with a first primary ion, second spectral data is obtained by irradiating the sample with a second primary ion, and a surface of the sample is etched by an ion and then the surface of the sample is irradiated with the first primary ion or the second primary ion. The first primary ion is more likely to break a molecular structure of a molecule contained in the sample than the second primary ion. | 10-24-2013 |
20130280858 | SEMICONDUCTOR DEVICE - A semiconductor device includes an oxide semiconductor layer provided over a substrate having an insulating surface; a gate insulating film covering the oxide semiconductor layer; a first conductive layer and a second conductive layer laminated in this order over the gate insulating film; an insulating film covering the oxide semiconductor layer and a gate wiring including a gate electrode (the first and second conductive layers); and a third conductive layer and a fourth conductive layer laminated in this order over the insulating film and electrically connected to the oxide semiconductor layer. The gate electrode is formed using the first conductive layer. The gate wiring is formed using the first conductive layer and the second conductive layer. A source electrode is formed using the third conductive layer. A source wiring is formed using the third conductive layer and the fourth conductive layer. | 10-24-2013 |
20130293285 | Booster Circuit, Semiconductor Device and Electronic Apparatus - A conventional circuit requires a booster circuit for generating a voltage higher than an external power supply voltage, thus low power consumption is difficult to be achieved. In addition, a display device incorporating the aforementioned conventional switching element for booster circuit has problems in that the current load is increased and the power supply becomes unstable with a higher output current. The invention provides a booster circuit including a first transistor, a second transistor, a first capacitor element, a second capacitor element, a diode, and an inverter, wherein one electrode of the first transistor is maintained at a predetermined potential, the output of the inverter is connected to the gate electrode of the first transistor and one electrode of the second transistor through the second capacitor element, the input of the inverter is connected to the other electrode of the first transistor through the first capacitor element and connected to the gate electrode of the second transistor, and the diode is connected between the other electrode of the first transistor and the other electrode of the second transistor so as to be forwardly biased. | 11-07-2013 |
20130300777 | Semiconductor Device and Driving Method Thereof, and Electronic Device - A driving method of a semiconductor device for compensating variation in threshold voltage and mobility of a transistor is provided. A driving method of a semiconductor device including a transistor and a capacitor electrically connected to a gate of the transistor includes a first period where voltage corresponding to threshold voltage of the transistor is held in the capacitor, a second period where a total voltage of video signal voltage and threshold voltage is held in the capacitor holding the threshold voltage, and a third period where charge held in the capacitor in accordance with the total voltage of the video signal voltage and the threshold voltage in the second period is discharged through the transistor. | 11-14-2013 |
20130300969 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer. | 11-14-2013 |
20130314304 | SEMICONDUCTOR DEVICE AND METHOD OF DRIVING THE SEMICONDUCTOR DEVICE - Display irregularities in light emitting devices, which develop due to dispersions per pixel in the threshold value of TFTs for supplying electric current to light emitting elements, are obstacles to increasing the image quality of the light emitting devices. An electric potential in which the threshold voltage of a TFT ( | 11-28-2013 |
20130321248 | Semiconductor Device and Method for Driving Semiconductor Device - By holding a voltage that depends on a video signal in a first capacitor, holding a voltage that depends on a threshold voltage of a transistor in a second capacitor, and then applying a total voltage of the voltage held in the first capacitor and the voltage held in the second capacitor between a source and a gate of the transistor, even when the threshold voltage varies, a current corresponding to the video signal can be supplied to a load. The voltage that depends on the video signal and the voltage that depends on the threshold voltage of the transistor are separately acquired. | 12-05-2013 |
20130321249 | Semiconductor Device and Method for Driving Semiconductor Device - One electrode of SW | 12-05-2013 |
20130334535 | Semiconductor Device, Display Device, And Electronic Device - A display device includes a load, a transistor for controlling a current value supplied to the load, a capacitor, a first wiring, a second wiring, and first to fourth switches. Variations in the current value caused by variations in the threshold voltage of the transistor can be suppressed through the steps of: (1) holding the threshold voltage of the transistor in the storage capacitor, (2) inputting a potential in accordance with a video signal, and (3) holding a voltage that is the sum of the threshold voltage and the potential in accordance with the video signal, in the storage capacitor. Accordingly, a desired current can be supplied to the load such as a light emitting element. | 12-19-2013 |
20130341627 | DISPLAY DEVICE - The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern. | 12-26-2013 |
20140014949 | Display Device and Electronic Device - To improve color reproduction areas in a display device having light-emitting elements. A display region has a plurality of picture elements. Each picture element includes: first and second pixels each including a light-emitting element which has a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more; third and fourth pixels each including a light-emitting element which has a chromaticity whose y-coordinate in the diagram is 0.55 or more; and fifth and sixth pixels each including a light-emitting element which has a chromaticity whose x-coordinate and y-coordinate in the diagram are 0.20 or less and 0.25 or less, respectively. The light-emitting elements in the first and second pixels have different emission spectrums from each other; the light-emitting elements in the third and fourth pixels have different emission spectrums from each other; and the light-emitting elements in the fifth and sixth pixels have different emission spectrums from each other. | 01-16-2014 |
20140015606 | ELECTRIC CIRCUIT - A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor. | 01-16-2014 |
20140016053 | LIQUID CRYSTAL DISPLAY DEVICE - The present invention has a pixel which includes a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 01-16-2014 |
20140048810 | DISPLAY DEVICE AND ELECTRONIC DEVICE - A transistor whose channel region includes an oxide semiconductor is used as a pull down transistor. The band gap of the oxide semiconductor is 2.0 eV or more, preferably 2.5 eV or more, more preferably 3.0 eV or more. Thus, hot carrier degradation in the transistor can be suppressed. Accordingly, the circuit size of the semiconductor device including the pull down transistor can be made small. Further, a gate of a pull up transistor is made to be in a floating state by switching of on/off of the transistor whose channel region includes an oxide semiconductor. Note that when the oxide semiconductor is highly purified, the off-state current of the transistor can be 1 aA/μm (1×10 | 02-20-2014 |
20140054587 | Semiconductor Device, Display Device, And Electronic Device - A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. By inputting a potential in accordance with a video signal into the pixel after the threshold voltage of the transistor is held in the storage capacitor, and holding a voltage of the sum of the threshold voltage and the potential, variations of a current value caused by variations of threshold voltage of a transistor can be suppressed. Consequently, a predetermined current can be supplied to the load such as a light-emitting element. Further, by changing the potential of a power supply line, a display device with a high duty ratio can be provided. | 02-27-2014 |
20140063397 | Liquid Crystal Display Device And Semiconductor Device - By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode. | 03-06-2014 |
20140071032 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - A low-resolution image is displayed at high resolution and power consumption is reduced. Resolution is made higher by super-resolution processing. Then, display is performed with the luminance of a backlight controlled by local dimming after the super-resolution processing. By controlling the luminance of the backlight, power consumption can be reduced. Further, by performing the local dimming after the super-resolution processing, accurate display can be performed. | 03-13-2014 |
20140077215 | DISPLAY DEVICE, SEMICONDUCTOR DEVICE, AND DRIVING METHOD THEREOF - An object is to provide a semiconductor device with improved operation. The semiconductor device includes a first transistor, and a second transistor electrically connected to a gate of the first transistor. A first terminal of the first transistor is electrically connected to a first line. A second terminal of the first transistor is electrically connected to a second line. The gate of the first transistor is electrically connected to a first terminal or a second terminal of the second transistor. | 03-20-2014 |
20140097883 | SEMICONDUCTOR DEVICE AND DRIVING METHOD OF THE SAME - In the case of reducing an effect of variations in current characteristics of transistors by inputting a signal current to a transistor in a pixel, a potential of a wiring is detected by using a precharge circuit. In the case where there is a difference between a predetermined potential and the potential of the wiring, a charge is supplied to the wiring to perform a precharge by charging rapidly. When the potential of the wiring reaches the predetermined potential, the supply of charge is stopped and a signal current only is supplied. Thus, a precharge is performed only in a period until the potential of the wiring reaches the predetermined potential, therefore, a precharge can be performed for an optimal period. | 04-10-2014 |
20140098334 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPLIANCE - A pixel electrode or a common electrode is a light-transmissive conductive film; therefore, it is formed of ITO conventionally. Accordingly, the number of manufacturing steps and masks, and manufacturing cost have been increased. An object of the present invention is to provide a semiconductor device, a liquid crystal display device, and an electronic appliance each having a wide viewing angle, less numbers of manufacturing steps and masks, and low manufacturing cost compared with a conventional device. A semiconductor layer of a transistor, a pixel electrode, and a common electrode of a liquid crystal element are formed in the same step. | 04-10-2014 |
20140111727 | Liquid Crystal Display Device - It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode. | 04-24-2014 |
20140117365 | DISPLAY DEVICE - In view of the problem that a reduced thickness of an EL film causes a short circuit between an anode and a cathode and malfunction of a transistor, the invention provides a display device that has a light emitting element including an electrode and an electroluminescent layer, a wire electrically connected to the electrode of the light emitting element, a transistor provided with an active layer including a source, a drain and a channel forming region, and a power supply line electrically connected to one of the source and the drain of the transistor, wherein the wire is electrically connected to the other of the source and the drain of the transistor, and the width of a part of the electrode in the vicinity of a portion where the electrode is electrically connected to the wire is smaller than that of the electrode in the other portion. | 05-01-2014 |
20140118675 | DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - It is an object of the present invention to form a pixel electrode and a metal film using one resist mask in manufacturing a stacked structure by forming the metal film over the pixel electrode. A conductive film to be a pixel electrode and a metal film are stacked. A resist pattern having a thick region and a region thinner than the thick region is formed over the metal film using an exposure mask having a semi light-transmitting portion. The pixel electrode, and the metal film formed over part of the pixel electrode to be in contact therewith are formed using the resist pattern. Accordingly, a pixel electrode and a metal film can be formed using one resist mask. | 05-01-2014 |
20140132872 | DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - In a semi-transmission liquid crystal display device, two resist masks are required to form a reflective electrode and a transparent electrode; therefore, cost is high. A transparent electrode and a reflective electrode which function as a pixel electrode are stacked. A resist pattern which includes a region having a thick film thickness and a region having a thinner film thickness than the aforementioned region is formed over the reflective electrode by using a light exposure mask which includes a semi-transmission portion. The reflective electrode and the transparent electrode are formed by using the resist pattern. Therefore, the reflective electrode and the transparent electrode can be formed by using one resist mask. | 05-15-2014 |
20140139568 | Liquid Crystal Display Device and Driving Method Thereof - To provide a hold-type display device without a problem of motion blur and a driving method thereof. The length of a period for displaying a blanking image in one frame period is controlled in accordance with a control parameter showing the degree of motion blur, and the level of a signal supplied to a display element is changed in accordance with the length of the period for displaying the blanking image. Accordingly, the hold-type display device without a problem of motion blur and the driving method thereof can be provided. | 05-22-2014 |
20140145181 | DISPLAY DEVICE - To provide a novel display device with improved reliability. The display device includes an insulating layer between a first wiring and a second wiring. The insulating layer includes a first insulating layer and a second insulating layer overlapping with the first insulating layer and a region where a part of the second insulating layer is removed, and the region serves as a protection circuit. In addition, the first insulating layer and the second insulating layer are included in a region where the insulating layer overlaps with a semiconductor layer of a transistor, and a region where the first insulating layer and the second insulating layer are removed is included in a region where the first wiring and the second wiring are directly connected to each other. | 05-29-2014 |
20140145182 | DISPLAY DEVICE AND ELECTRONIC DEVICE - To provide a novel display device. The display device includes a pixel portion, a driver circuit portion that is provided outside the pixel portion, and a protection circuit that is electrically connected to one of or both the pixel portion and the driver circuit portion and includes a pair of electrodes. The pixel portion includes pixel electrodes arranged in a matrix and transistors electrically connected to the pixel electrodes. The transistor includes a first insulating layer containing nitrogen and silicon, and a second insulating layer containing oxygen, nitrogen, and silicon. The protection circuit includes the first insulating layer between the pair of electrodes. | 05-29-2014 |
20140152387 | SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS USING THE SAME - The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source. | 06-05-2014 |
20140152712 | DISPLAY DEVICE AND DRIVING METHOD OF DISPLAY DEVICE - It is an object of the present invention to reduce a cause of pseudo contour when display is performed with a time gray scale method. According to the present invention, one pixel is divided into m sub-pixels so that an area ratio of each sub-pixel becomes 2 | 06-05-2014 |
20140167056 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - A voltage equal to the threshold value of a TFT ( | 06-19-2014 |
20140184324 | ANALOG CIRCUIT AND DISPLAY DEVICE AND ELECTRONIC DEVICE - The invention provides an analog circuit that decreases an effect of variation of a transistor. By flowing a bias current in a compensation operation, a voltage between the gate and source of the transistor to be compensated is held in a capacitor. In a normal operation, the voltage stored in the compensation operation is added to a signal voltage. As the capacitor holds the voltage according to the characteristics of the transistor to be compensated, the effect of variation can be decreased by adding the voltage stored in the capacitor to the signal voltage. Further, an analog circuit which decreases the effect of variation can be provided by applying the aforementioned basis to a differential circuit, an operational amplifier and the like. | 07-03-2014 |
20140184484 | DISPLAY DEVICE - To provide a novel display device where display quality does not deteriorate. The display device includes a display portion configured to display a still image at a frame frequency of 30 Hz or lower. The display portion includes a driver circuit, a plurality of wirings, and a pixel portion. The pixel portion comprises a plurality of pixels. Each of the plurality of pixels comprises a transistor, a display element, and a capacitor. A channel is formed in an oxide semiconductor layer included in the transistor. A gate of the transistor is electrically connected to one of the plurality of wirings. The driver circuit performs scanning where the plurality of wirings in one of odd-numbered rows and even-numbered rows are sequentially selected and scanning where the plurality of wirings in the other of the odd-numbered rows and the even-numbered rows are sequentially selected. | 07-03-2014 |
20140184976 | Liquid Crystal Display Device - It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer. | 07-03-2014 |
20140192098 | Semiconductor Device and Driving Method Thereof - Brightness irregularities that develop in a light emitting device due to is persion among pixels in the threshold values of TFTs used for supplying electric current to light emitting devices become obstacles to improved image quality of the light emitting device. As an image signal input to a pixel from a source signal line, a desired electric potential is applied to a gate electrode of a TFT for supplying electric current to an EL device, through a TFT having its gate and drain connected to each other. A voltage equal to the TFT threshold value is produced between the source and the drain of the TFT | 07-10-2014 |
20140203284 | Semiconductor Device and Method for Manufacturing the Same - A semiconductor device includes a pixel electrode and a transistor which includes a first gate electrode, a first insulating layer over the first gate electrode, a semiconductor layer over the first insulating layer, a second insulating layer over the semiconductor layer, and a second gate electrode. The pixel electrode and the second gate electrode are provided over the second insulating layer. The first gate electrode has a region overlapping with the semiconductor layer with the first insulating layer provided therebetween. The second gate electrode has a region overlapping with the semiconductor layer with the second insulating layer provided therebetween. A first region is at least part of a region where the second gate electrode overlaps with the semiconductor layer. A second region is at least part of a region where the pixel electrode is provided. The second insulating layer is thinner in the first region than in the second region. | 07-24-2014 |
20140204074 | Light Emitting Device and Electronic Equipment Using the Same - A light emitting device is provided which is capable of displaying in desired colors stably by controlling a change in luminance of OLED when an organic light emitting layer is degraded or there is a change in temperature of the surroundings. A reference value for the amount of current flowing into a pixel portion is calculated from data of a video signal. Then, the pixel portion displays an image in accordance with the data of the video signal and the drive current at the time is measured for all of OLEDs in the pixel portion. The two voltage values supplied from a variable power supply to the pixel portion are corrected such that the measured drive current approaches the reference value. With the above structure, lowering of luminance which accompanies degradation of an organic light emitting layer is prevented and a clear image can be displayed as a result. | 07-24-2014 |
20140204325 | Liquid Crystal Display Device - It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode. | 07-24-2014 |
20140231807 | LIQUID CRYSTAL DISPLAY DEVICE - It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element. | 08-21-2014 |
20140231808 | DISPLAY DEVICE - The inventors found out that in the case of performing a low gray scale display in which a very small amount of current is supplied to a light emitting element, variations in threshold voltages of driving transistors become notable since the gate-source voltage is low. In view of this, the invention provides a display device in which variations in the threshold voltages of the driving transistors are reduced even in the low gray scale display, and a driving method thereof. According to the invention, a gate-source voltage of the driving transistor is set higher in the low gray scale display than that in the high gray scale display. As one mode to achieve this, different power source lines are provided for the low gray scale display and the high gray scale display and their potentials are set to be different. | 08-21-2014 |
20140232291 | Semiconductor Device - A semiconductor device includes a transistor, a light-emitting element, a first wiring, a driver circuit having a function of controlling the potential of the first wiring, a second wiring, a first switch, a second switch, a third switch, a fourth switch, a first capacitor, and a second capacitor. One of a source and a drain of the transistor is connected to the light-emitting element. With this structure, voltage applied between the source and the gate of the transistor can be corrected in anticipation of variations in threshold voltage, so that the current supplied to the light-emitting element can be corrected. | 08-21-2014 |
20140232622 | Current Source Circuit, A Signal Line Driver Circuit and a Driving Method Thereof and a Light Emitting Device - A current source circuit includes current sources that are each configured to receive an external set signal and to control an output current value based on the external set signal. A changing over circuit that is electrically connected to the current sources and a set of output lines selects one of the current sources to be electrically connected to each of the output lines. | 08-21-2014 |
20140291676 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a substrate having an insulating surface; a light-transmitting first electrode provided over the substrate; a light-transmitting second electrode provided over the substrate; a light-transmitting semiconductor layer provided so as to be electrically connected to the first electrode and the second electrode; a first wiring electrically connected to the first electrode; an insulating layer provided so as to cover at least the semiconductor layer; a light-transmitting third electrode provided over the insulating layer in a region overlapping with the semiconductor layer; and a second wiring electrically connected to the third electrode. | 10-02-2014 |
20140292741 | DISPLAY DEVICE - To reduce power consumption of a display device. A sequence of supply of video signals to a plurality of pixels included in an active matrix display device is controlled. For example, a supply sequence is controlled so that the potentials of the video signals supplied to a plurality of pixels are in ascending order or in descending order. This enables a reduction in the amount of charge and discharge of electric charge of signal lines which supply video signals to a plurality of pixels. Consequently, power consumption of the display device can be reduced. | 10-02-2014 |
20140299927 | Digital Circuit Having Correcting Circuit and Electronic Apparatus Thereof - Provided is a digital circuit ( | 10-09-2014 |
20140300783 | METHOD FOR DRIVING SEMICONDUCTOR DEVICE - The resolution of a low-resolution image is made high and a stereoscopic image is displayed. Resolution is made high by super-resolution processing. In this case, the super-resolution processing is performed after edge enhancement processing is performed. Accordingly, a stereoscopic image with high resolution and high quality can be displayed. Alternatively, after image analysis processing is performed, edge enhancement processing and super-resolution processing are concurrently performed. Accordingly, processing time can be shortened. | 10-09-2014 |
20140302622 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device includes a pixel portion having a first thin film transistor and a driver circuit having a second thin film transistor. Each of the first thin film transistor and the second thin film transistor includes a gate electrode layer, a gate insulating layer, a semiconductor layer, a source electrode layer, and a drain electrode layer. Each of the layers of the first thin film transistor has a light-transmitting property. Materials of the gate electrode layer, the source electrode layer and the drain electrode layer of the first thin film transistor are different from those of the second transistor, and each of the resistances of the second thin film transistor is lower than that of the first thin film transistor. | 10-09-2014 |
20140312347 | SEMICONDUCTOR DEVICE - Adverse effects of variation in threshold voltage are reduced. In a semiconductor device, electric charge is accumulated in a capacitor provided between a gate and a source of a transistor, and then, the electric charge accumulated in the capacitor is discharged; thus, the threshold voltage of the transistor is obtained. After that, current flows to a load. In the semiconductor device, the potential of one terminal of the capacitor is set higher than the potential of a source line, and the potential of the source line is set lower than the potential of a power supply line and the cathode side potential of the load. | 10-23-2014 |
20140313444 | LIQUID CRYSTAL DISPLAY DEVICE - To improve viewing angle characteristics by varying voltage which is applied between liquid crystal elements. A liquid crystal display device in which one pixel is provided with three or more liquid crystal elements and the level of voltage which is applied is varied between the liquid crystal elements is varied. In order to vary the level of the voltage which is applied between the liquid crystal elements, an element which divides the applied voltage is provided. In order to vary the level of the applied voltage, a capacitor, a resistor, a transistor, or the like is used. Viewing angle characteristics can be improved by varying the level of the voltage which is applied between the liquid crystal elements. | 10-23-2014 |
20140313445 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE - To provide a semiconductor device, a liquid crystal display device, and an electronic device which have a wide viewing angle and in which the number of manufacturing steps, the number of masks, and manufacturing cost are reduced compared with a conventional one. The liquid crystal display device includes a first electrode formed over an entire surface of one side of a substrate; a first insulating film formed over the first electrode; a thin film transistor formed over the first insulating film; a second insulating film formed over the thin film transistor; a second electrode formed over the second insulating film and having a plurality of openings; and a liquid crystal over the second electrode. The liquid crystal is controlled by an electric field between the first electrode and the second electrode. | 10-23-2014 |
20140319491 | DISPLAY DEVICE - The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern. | 10-30-2014 |
20140327606 | Display Device - In a device for displaying images by application of an electric field to a charged substance, a structure for reducing afterimages and a method for manufacturing the structure are provided. The device is a display device which includes a plurality of pixel electrodes and a charged layer (a layer including a charged substance) provided over the pixel electrodes. An end of one of two pixel electrodes that are adjacent to each other among the plurality of pixel electrodes has a depression in an end-face direction, and an end of the other of the pixel electrodes has a projection in the end-face direction. In a state in which the depression and the projection are in a set, a gap is formed between the two pixel electrodes. | 11-06-2014 |
20140327663 | DRIVING METHOD OF SEMICONDUCTOR DEVICE - The semiconductor device includes a transistor and a capacitor element which is electrically connected to a gate of the transistor. Charge held in the capacitor element according to total voltage of voltage corresponding to the threshold voltage of the transistor and image signal voltage is once discharged through the transistor, so that variation in current flowing in the transistor or mobility of the transistor can be reduced. | 11-06-2014 |
20140334596 | ELECTRONIC DEVICE - A single-crystal semiconductor layer is separated from a single-crystal semiconductor substrate and is fixed to an insulating substrate to form a TFT over the insulating substrate. Then, a driver circuit is formed using the TFT. The TFT has excellent current characteristics because an active layer is almost in a single-crystal state. Accordingly, a small thin display device with low power consumption can be manufactured. Further, a controller and a shift register which is included in a source driver are operated at the same power supply voltage. Thus, power consumption can be reduced. | 11-13-2014 |
20140339578 | METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE - The present invention provides a manufacturing technique of a semiconductor device and a display device using a peeling process, in which a transfer process can be conducted with a good state in which a shape and property of an element before peeling are kept. Further, the present invention provides a manufacturing technique of more highly reliable semiconductor devices and display devices with high yield without complicating the apparatus and the process for manufacturing. According to the present invention, an organic compound layer including a photocatalyst substance is formed over a first substrate having a light-transmitting property, an element layer is formed over the organic compound layer including a photocatalyst substance, the organic compound layer including a photocatalyst substance is irradiated with light which has passed through the first substrate, and the element layer is peeled from the first substrate. | 11-20-2014 |
20140346506 | ELECTRONIC DEVICE, DISPLAY DEVICE, AND SEMICONDUCTOR DEVICE AND METHOD FOR DRIVING THE SAME - A pixel having a transistor which controls a current value supplied to a load, a first storage capacitor, a second storage capacitor, and first to fourth switches is included. After the threshold voltage of the transistor is held in the second storage capacitor, a potential in accordance with a video signal is input to the pixel. Voltage obtained by adding a potential in which the potential in accordance with the video signal and the first storage capacitor are capacitively divided to the threshold voltage is held in the second storage capacitor in this manner, so that variation of a current value caused by variations in the threshold voltage of the transistor is suppressed. Thus, desired current can be supplied to the load such as a light-emitting element. In addition, a display device with little deviation from luminance specified by the video signal can be provided. | 11-27-2014 |
20140346538 | Light-Emitting Device and Electronic Device Using the Same - It is an object to provide a light-emitting device and an electronic device which can provide an image with excellent image quality. One of the present inventions is a light-emitting device including a plurality of light-emitting elements each exhibiting a different emission color. At least one of the plurality of light-emitting elements has n light-emitting layers (n is a natural number, n≧2) between a pair of electrodes. Further, at least one of the n light-emitting layers includes a substance which provides emission from a triplet excitation state. In a light-emitting device having such a structure, an image is displayed by combining emissions from the plurality of light-emitting elements. | 11-27-2014 |
20140361959 | DISPLAY DEVICE - In a display element such as an organic EL element, deterioration progresses due to light emission, and emission luminance is lowered even if the same voltage is applied to the display element. Therefore, use over time causes variations in luminance of each pixel, thereby a so-called “image burn-in” phenomenon occurs. Given this factor, the invention provides a display device which can reduce the difference in deterioration of a display element in each pixel and suppress variations in light emission of a display element in a pixel. It is prevented that only a specific pixel has a long accumulated lighting time. For that purpose, a gray scale of a display pattern is changed to prevent the difference in deterioration of display element in pixels from increasing. Alternatively, a specific display pattern is prevented from being fixedly displayed in a specific region. Further alternatively, a pixel lagging behind in deterioration is deteriorated so that the accumulated lighting time of pixels is equal to each other. | 12-11-2014 |
20140367690 | ILLUMINATION APPARATUS - A point light source is converted into a plane light source having a satisfactory uniformity. The point light source is converted into a line light source by means of a linear light guiding plate, and further into the plane light source by means of a plane-like light guiding plate. Light from the point light source is reflected at a lamp reflector to be incident on at least two side surfaces of the plane-like light guiding plate. | 12-18-2014 |
20140368273 | ELECTRIC CIRCUIT - A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor. | 12-18-2014 |
20140374803 | DRIVING METHOD OF A SEMICONDUCTOR DEVICE - A horizontal scanning period is divided into n parts (n is a natural number), so that horizontal scanning can be performed (n×y) times in one frame period. That is, n signals can be outputted from each pixel, and storage times of the n signals are different from one another. Then, since a signal suited to the intensity of light irradiated to each pixel can be selected, information of an object can be accurately read. | 12-25-2014 |
20150021601 | SEMICONDUCTOR DEVICE AND ELECTRONIC DEVICE - An object is to improve the drive capability of a semiconductor device. The semiconductor device includes a first transistor and a second transistor. A first terminal of the first transistor is electrically connected to a first wiring. A second terminal of the first transistor is electrically connected to a second wiring. A gate of the second transistor is electrically connected to a third wiring. A first terminal of the second transistor is electrically connected to the third wiring. A second terminal of the second transistor is electrically connected to a gate of the first transistor. A channel region is formed using an oxide semiconductor layer in each of the first transistor and the second transistor. The off-state current of each of the first transistor and the second transistor per channel width of 1 μm is 1 aA or less. | 01-22-2015 |
20150022561 | DATA PROCESSING DEVICE - To provide a highly browsable data processing device, provide a highly portable data processing device, provide a data processing device which consumes low power, or provide a data processing device having high display quality, the data processing device includes a display portion having flexibility, a plurality of driver circuit portions arranged in the periphery of the display portion, a sensor portion discerning an external state of the display portion, an arithmetic portion supplying image data to the driver circuit portions, and a memory portion storing a program executed by the arithmetic portion. A first mode in which the display portion is unfolded or a second mode in which the display portion is folded is sensed by the sensor. Luminance adjustment processing is carried out by the program in accordance with the first mode or the second mode. | 01-22-2015 |
20150028344 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE, AND ELECTRONIC DEVICE - A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. By inputting a potential in accordance with a video signal into the pixel after the threshold voltage of the transistor is held in the storage capacitor, and holding a voltage of the sum of the threshold voltage and the potential, variations of a current value caused by variations of threshold voltage of a transistor can be suppressed. Consequently, a predetermined current can be supplied to the load such as a light-emitting element. Further, by changing the potential of a power supply line, a display device with a high duty ratio can be provided. | 01-29-2015 |
20150034954 | SEMICONDUCTOR DEVICE - Solved is a problem of attenuation of output amplitude due to a threshold value of a TFT when manufacturing a circuit with TFTs of a single polarity. In a capacitor ( | 02-05-2015 |
20150042545 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - A pixel is divided into m (m is an integer of m≧2) sub-pixels, and an area ratio of an s-th (s is an integer of 1 to m) sub-pixel is to be 2 | 02-12-2015 |
20150042918 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - A driver circuit includes a circuit | 02-12-2015 |
20150048370 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - To reduce adverse effect of variations in threshold voltage. A semiconductor device includes a transistor including a gate connected to one electrode of a capacitor and one terminal of a SW1, a source and a drain one of which is connected to one terminal of a SW2 and one terminal of a SW3 and the other of which is connected to the other terminal of the SW1 and one terminal of a SW4; a first wiring electrically connected to the other terminal of the SW2; a second wiring electrically connected to the other terminal of the SW4; a load including electrodes one of which is connected to one electrode of the capacitor and the other terminal of the SW3; and a third wiring connected to the other electrode of the load. | 02-19-2015 |
20150048376 | Semiconductor Device, and Display Device and Electronic Device Utilizing the Same - A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor | 02-19-2015 |
20150053979 | DISPLAY DEVICE, DRIVING METHOD OF DISPLAY DEVICE, AND ELECTRONIC APPLIANCE - A semiconductor device including a plurality of pixels over a substrate and a display medium including an electronic ink over the substrate, in which at least one pixel of the plurality of pixels comprises first and second subpixels each of which comprises a transistor that comprises an oxide semiconductor including indium, and in which one image of at least one of the plurality of pixels is displayed by a plurality of signals, is provided. | 02-26-2015 |
20150060864 | SEMICONDUCTOR DEVICE, DISPLAY DEVICE AND ELECTRONIC DEVICE - When writing a signal current from a current source to a current source circuit, noise occurs in some cases in a wiring through which a current flows, which may cause a potential of the wiring to be outside the normal range. As the potential does not turn back within the normal range easily at this time, writing to the current source circuit is delayed. According to the invention, when the potential becomes outside the normal range due to noise occurring in a wiring through which a current flows when writing a signal current from a current source to a current source circuit, a current is supplied from other than the current source, thereby the potential of the wiring can turn back within the normal range rapidly. | 03-05-2015 |
20150062112 | Electronic Circuit, Display Device, Electronic Device, And Method For Driving Electronic Circuit - To control the state of an input signal and output signal of a sequential circuit in order to prevent a malfunction of an electronic circuit. An electronic circuit includes a sequential circuit and a control circuit. A first signal, a second signal, and a third signal are input to the sequential circuit as a start signal, a clock signal, and a reset signal, respectively. The sequential circuit outputs, as an output signal, a fourth signal whose state is set in accordance with the state of the inputted first signal, second signal, and third signal. The control circuit controls the state of the third signal input to the sequential circuit. | 03-05-2015 |
20150070621 | LIQUID CRYSTAL DISPLAY DEVICE AND SEMICONDUCTOR DEVICE - By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode. | 03-12-2015 |
20150076998 | SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF - The invention provides a semiconductor device which performs a write operation of a signal current rapidly to a current input type pixel. Before inputting a signal current, a precharge operation is performed by flowing a large current. After that, a signal current is inputted to perform the set operation. A predetermined potential can be obtained rapidly as the precharge operation is performed before the set operation. The predetermined potential is approximately equal to a potential after completing the set operation. Therefore, the set operation can be rapidly performed and a write operation of a signal current can be rapidly performed. By using two transistors, a gate width W can be long or a gate length L can be short in the precharge operation or the gate width W can be short and the gate length L can be long in the set operation. | 03-19-2015 |
20150077615 | LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND DRIVING METHOD THEREOF - Provided is a display device or the like which can illuminate a subject with high-luminance illumination light. Another embodiment of the present invention provides a display device which can be used as a light source for a subject, or a display device which can be used as a light source for a subject, can display images and texts, and can switch these functions. The transistor of the light-emitting device is configured to operate in a saturation region in a period during which the light-emitting device displays text or an image, and is configured to operate in a linear region in a period during which the light-emitting device emits illumination light to a subject. | 03-19-2015 |