Class / Patent application number | Description | Number of patent applications / Date published |
315169300 | Electroluminescent device | 59 |
20080197784 | Device For Improving Pixel Addressing - The invention relates to a microelectronic device for producing light radiation according to a wide luminance range which can be used, in particular for forming improved screen pixels or, for example OLED-type display pixels. | 08-21-2008 |
20080197785 | Display apparatus and electronic apparatus - A display apparatus includes a pixel unit in which pixels are arranged in a matrix pattern; and a driving circuit for driving the pixel unit. Each of the pixels includes a signal level holding capacitor; a first transistor that is turned on/off in response to a writing signal and via which one end of the signal level holding capacitor is connected to a signal line; a second transistor having one end of the signal level holding capacitor connected to a gate thereof and the other end of the signal level holding capacitor connected to a source thereof; a current-driven self-light-emitting element whose cathode is held at a cathode potential and whose anode is connected to the source of the second transistor; a third transistor that is turned on/off in response to a driving pulse signal; and a fourth transistor that is turned on/off in response to a control signal. | 08-21-2008 |
20080203931 | Organic light emitting display and method of manufacturing the same - A light emitting display includes a substrate, a semiconductor layer on the substrate, a first insulation layer on the semiconductor layer, a first electrode layer and a second electrode layer on the first insulation layer, the first electrode layer having a first length and the second electrode layer having a second length, the first electrode layer corresponding to a storage capacitor, the second electrode layer corresponding to a boosting capacitor, a second insulation layer on the first electrode layer and the second electrode layer, and a third electrode layer on the second insulation layer, wherein a length of a first portion of the third electrode layer that overlaps the first electrode layer is longer than a length of a second portion of the third electrode layer that overlaps the second electrode layer. | 08-28-2008 |
20080211414 | Light emitting device - A light emitting device is provided that includes a substrate, a light emitting unit formed on the substrate, and an encapsulation unit. The encapsulation unit may include a first region corresponding to the light emitting unit and a second region coalesced with the substrate. The encapsulation unit of the first region or a part of the encapsulation unit of the first region may have a positive curvature. | 09-04-2008 |
20080218090 | LIGHT EMITTING DEVICE - A light emitting device is disclosed. The light emitting device includes a substrate, a display unit that is positioned on the substrate and includes a plurality of subpixels, signal lines on the substrate, a pad unit positioned at either edge of the substrate, and a dummy pad unit positioned at both sides of the pad unit outside the pad unit on the signal lines. The signal lines include scan lines, power supply lines, and ground lines which are connected to the plurality of subpixels. The pad unit includes a driver supplying driving signals to the signal lines. The dummy pad unit is connected to the signal lines. | 09-11-2008 |
20080218091 | METHOD OF MANUFACTURING DISPLAY DEVICE - A method of manufacturing a display device reduces damage to pad electrodes. The method includes: forming a thin film transistor in a pixel area on a first substrate and simultaneously forming a pad electrode in a pad area on the first substrate; forming a first pixel electrode connected to the thin film transistor and simultaneously forming a pad protection layer covering the pad electrode; and exposing the pad electrode by removing the pad protection layer. | 09-11-2008 |
20080224621 | Display device - A display device includes a pixel area where a plurality of pixels are arranged in a matrix and a driving circuit for driving the pixel area. Each of the pixels includes a signal-level holding capacitor having two ends, a first transistor that is turned on and off in accordance with a write signal, a second transistor having a gate connected to the one end of the signal-level holding capacitor and a source connected to the other end of the signal-level holding capacitor, a current-driven self-luminous light-emitting element having a cathode held at a cathode potential and an anode connected to the source of the second transistor, a third transistor that is turned on and off in accordance with a driving-pulse signal, and a fourth transistor that is turned on and off in accordance with a control signal. | 09-18-2008 |
20080231199 | Driving method for organic electroluminescence light emitting section - A driving method for an organic electroluminescence light emitting section of an organic EL display apparatus which includes a scanning circuit, an image signal outputting circuit, totaling N×M organic electroluminescence elements, M scanning lines, N data lines, and a current supplying section. The driving method, includes the steps of: carrying out a preprocess; carrying out a threshold voltage cancellation process; carrying out a wiring process; and supplying current to the organic electroluminescence light emitting section to drive the organic electroluminescence light emitting section. | 09-25-2008 |
20080231200 | Driving method for organic electroluminescence light emitting section - A driving method for an organic electroluminescence light emitting section using a driving circuit, the driving circuit includes a driving transistor, an image signal writing transistor, a light emission control transistor, and a capacitor section. The driving method includes the steps of: carrying out a preprocess of applying a first node initialization voltage and applying a second node initialization voltage; carrying out a threshold voltage cancellation process; placing the light emission control transistor into an on state, a writing process of applying an image signal; and placing the image signal writing transistor into an off state so that current is supplied to the organic electroluminescence light emitting section to drive the organic electroluminescence light emitting section. | 09-25-2008 |
20080238327 | AMOLED DRIVE CIRCUIT USING TRANSIENT CURRENT FEEDBACK AND ACTIVE MATRIX DRIVING METHOD USING THE SAME - Disclosed herein is an Active Matrix Organic Light-Emitting-Diode (AMOLED) drive circuit using transient current feedback. The AMOLED drive circuit includes a current Digital-to-Analog Converter (DAC), a data line drive transistor, a constant current source, a variable current source, a differential amplifier, and a transient charging current control unit. The DAC generates current corresponding to input digital data. The data line drive transistor is configured such that the drain terminal thereof is connected to the output node of the current DAC. The constant current source is connected between the source terminal of the data line drive transistor and a ground. The variable current source is connected between both the output node of the current DAC and the drain terminal of the drive transistor, and a voltage source. The differential amplifier is configured to input the output voltage thereof to the gate terminal of the drive transistor. The transient charging current control unit is configured to increase or decrease the bias current of the variable current source depending on variation in the voltage of the output node of the current DAC. | 10-02-2008 |
20080238328 | LIGHT EMITTING PIXEL AND APPARATUS FOR DRIVING THE SAME - A light emitting pixel includes a first organic light emitting diode (OLED) and a capacitor supplying to the first OLED current generated by an electric charge corresponding to a difference between a first voltage supplied to a first electrode of the capacitor and a second voltage supplied to a second electrode of the capacitor. The light emitting pixel further include a second OLED to supply the first voltage to the first electrode. The light emitting pixel further includes a voltage supply device to supply the first voltage to the first electrode in response to the second voltage. | 10-02-2008 |
20080246407 | 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. | 10-09-2008 |
20080252223 | Organic EL Display Device - The present invention provides an organic EL display device with high detection accuracy which can enhance both of light emission efficiency and light reception efficiency. In an organic EL display device which includes organic thin film elements, a power source line is connected to the organic thin film elements via drive TFTs, a signal line is connected to a gate of the drive TFT to supply a potential corresponding to a gray scale signal, a switch is provided for connecting the signal line and the organic thin film element, and the switch is controlled to allow an electric current which is obtained by photoelectric conversion with the organic thin film element to flow in the signal line and the organic thin film element during a period in which a gray scale signal is not applied to the signal line. | 10-16-2008 |
20080265785 | ORGANIC LIGHT EMITTING DEVICE - An organic light emitting device is disclosed. The organic light emitting device includes a substrate, a display unit that is positioned on the substrate and includes a subpixel and a monitor pixel, a first line supplying a voltage to the subpixel and the monitor pixel, a second line supplying a direct current (DC) power to the monitor pixel, a third line that transfers an electrical signal used to display an image on the subpixel, and a shield layer that is positioned on or under the second line and is electrically connected to the first line. | 10-30-2008 |
20080265786 | EL display device and electronic device - An EL display device capable of producing a vivid multi-gradation color display, and an electronic device having the EL display device. An electric current supplied to an EL element | 10-30-2008 |
20080265787 | LIGHTING SYSTEMS FOR FOLDABLE ENCLOSURES AND METHODS OF USE - There is provided method and apparatus for illuminating a foldable enclosure. | 10-30-2008 |
20080265788 | EL LIGHT EMITTING TOUCH SWITCH - A touch switch is composed of an EL light emitting layer configured by stacking a fluorescent layer and an insulation layer between first electrodes and a second electrode, a judgment means for making a judgment on touch manipulation with the first electrode by an operator and an EL driving unit for driving the EL light emitting layer for light emitting, with each of a plurality of first electrodes, each of plurality of fluorescent layers and each of plurality of insulation layers being provided as a set and the second electrode being provided as a single electrode with respect to the plurality of first electrodes, wherein the judgment means makes a judgment on which of the plurality of first electrodes has been touched by an operator on the basis of a high-frequency component inputted from the second electrode through the first electrode each time the touch switch is touched by an operator. | 10-30-2008 |
20080284342 | Electroluminescent Element Driving Apparatus - The present utility model discloses an electroluminescent element driving apparatus, which mainly resolves the problems caused by insufficient supplying of an electric power to affect the service life of the apparatus in the prior art. The electroluminescent element driving apparatus disclosed by the present utility model includes a power supply, a controlling IC, an electroluminescent element driving unit, a electroluminescent cell comprised of an electroluminescent element, and a charging unit connected to the power supply. The power supply continually storage's electric power while it supplies the power to the controlling IC and the electroluminescent element driving unit, respectively, the controlling IC supplies a flash to at least one electroluminescent element driving unit, the electroluminescent element driving unit transmits a signal having the flash to the electroluminescent cell, and the electroluminescent cell displays the signal having the flash. Since the electroluminescent element driving means disclosed by the present utility model includes the charging unit, although the electroluminescent element will consumes much power, a battery may be charged by exterior when its electricity is lack, thereby it may be reused. Thus, the present utility model advantageously eliminates the problems of lack of the electric power and a shorting life when applied to a flashing equipment. | 11-20-2008 |
20080290807 | Electro-optical device, matrix substrate, and electronic apparatus - To provide a wiring layout of electric power lines, which improves the aperture ratio of the pixel while forming pixels with the same pixel pitch. An electric-optical apparatus according to the present invention comprises multiple pixels ( | 11-27-2008 |
20080297056 | LIGHT EMITTING ELEMENT CIRCUIT AND DRIVE METHOD THEREOF - The present invention provides a light emitting element circuit that includes a current mirror circuit which includes two thin film transistors, two current input terminals and two output terminals, a capacitor for holding voltage corresponding to an electric current to be input from one of the two current input terminals, and a light emitting element connected to the current mirror circuit, and that supplies an electric current in accordance with the voltage held in the capacitor to the light emitting element through the current mirror circuit, wherein the two output terminals of the current mirror circuit are connected to the light emitting element, and the two current input terminals of the current mirror circuit are connected with each other through a switch in a time period other than a time period during which an electric current is input from the one of the two current input terminals. | 12-04-2008 |
20090001895 | ORGANIC ELECTRO-LUMINESCENT DISPLAY DEVICE - An organic electro-luminescent display device includes barriers in a non-display area to protect a display area from water and oxygen. Barriers may include a permeation prevention barrier, a voltage contact portion, and a blocking layer. A permeation prevention barrier includes contact portions where a barrier layer having a lower permeability than a passivation layer penetrates through the passivation layer. A voltage contact portion penetrates the passivation layer so that a signal supply line contacts a conductive material. A blocking layer covers a wall, a planarization layer, and an inorganic insulation layer, and has a lower permeability than the planarization layer, the wall, and the inorganic insulation layer. The permeation prevention barrier, the voltage contact portion, and the blocking layer may be used in various combinations. | 01-01-2009 |
20090001896 | Light-Emitting Device and Method of Manufacturing the Same, and Method of Operating Manufacturing Apparatus - The inventors has been anticipated that there is no problem in employing electron gun deposition as a method of forming a metallic layer on the EL layer because the TFT is disposed blow the ET layer in the active matrix light-emitting device. However, since the TFT is extremely sensitive to ionized evaporated particles, the secondary electron, the reflecting electron, and so on generated by the electron gun, little damage was observed on the EL layer, but significant damages were found on the TFT when electron gun deposition is employed. The invention provides an active matrix light-emitting device having superior TFT characteristics (ON current, OFF to current, Vth, S-value, and so on), in which an organic compound layer and a metallic layer (cathode or anode) are formed by means of resistive heating having least influence to the TFT. | 01-01-2009 |
20090001897 | Display Device - In the case of applying the ABL control to a display device having electron emitters disposed in a matrix, voltage drop caused by the scan line resistance is corrected, thereby displaying a preferable image without a smear. A high voltage load current limiting section for calculating drive voltage alteration data based on a high voltage load current detection signal from a high voltage load current detection section, and a scan voltage correction section for calculating a scan voltage based on the drive voltage alteration data are provided, thus the scan voltage in accordance with the high voltage load current detection signal is output to a scan line selection circuit. Further, a voltage drop correction section is provided to subtract the drive voltage alteration data from the drive voltage data obtained from image data input thereto, and signal voltage data is calculated and is output to the signal line drive circuit | 01-01-2009 |
20090009094 | ACTIVE MATRIX TYPE ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME - Disclosed are an active matrix type organic electroluminescent display device and a manufacturing method thereof. At least two capacitors having different functions from each other are disposed in a vertically stacked structure within a unit pixel region. When a compensation circuit needing two or more capacitors having different functions from each other per pixel is applied, the two or more capacitors are vertically stacked, thereby preventing the aperture ratio from being lowered due to the increase in the number of capacitors within the pixel. | 01-08-2009 |
20090015168 | Flat Lighting Device - A flat lighting device ( | 01-15-2009 |
20090026969 | ORGANIC LIGHT EMITTING DEVICE - An organic light emitting device is disclosed. The organic light emitting device includes a display unit on a substrate, the display unit including a plurality of subpixels, a plurality of monitor pixels positioned outside the display unit, a driver that supplies a data signal to the display unit in each of a plurality of subfields, a power supply unit that supplies a power to the display unit and the monitor pixels, and a sample hold unit connected to power terminals of the monitor pixels. When most significant bit is defined as n-bit, the sample hold unit samples a current supplied to the power terminals of the monitor pixels into a voltage in any one of the subfields corresponding to bit equal to or more than (n−2)-bit among the plurality of subfields, and transmits the sampled voltage to the power supply unit. | 01-29-2009 |
20090026970 | Method of Manufacturing Thin Film Transistor - The object of the present invention is to form a low-concentration impurity region with good accuracy in a top gate type TFT. Phosphorus is added to a semiconductor layer by using a pattern made of a conductive film as a mask to form an N-type impurity region in a self-alignment manner. A positive photoresist is applied to a substrate so as to cover the pattern and then is exposed to light applied to the back of the substrate and then is developed, whereby a photoresist | 01-29-2009 |
20090033230 | LIGHT EMITTING DEVICE - It is an object of the invention to provide a light emitting device in which burden on a light emitting element having low luminous efficiency is relieved, and the deterioration of a light emitting element, the reduction in color reproduction due to the deteriorated light emitting element, and increase in electric power consumption can be suppressed. A light emitting device according to the invention has light emitting elements each of which emits one of colors corresponding to three primary colors. Further, one feature of the light emitting device according to the invention has a light emitting element which emits a neutral color. The light emitting device according to the invention has a structure in which a plurality of pixels having light emitting elements each of which emits one of colors corresponding to three primary colors, and a light emitting element which emits a neutral color as one group, are arranged. | 02-05-2009 |
20090033231 | Flat Panel Display - A high-speed flat panel display having a long lifetime. Thin film transistors in a pixel portion having a plurality of pixels are contacted differently from thin film transistors in driving circuit portions for driving the pixels, thereby enhancing luminance uniformity and reducing power consumption. The thin film transistors each have a channel region and a body contact region for applying a predetermined voltage to the channel region. At least one thin film transistor in the pixel portion is a source-body contact thin film transistor having the body contact region connected to one of source and drain electrodes so that the predetermined voltage can be provided to the channel region. Each thin film transistor in the driving circuit portion is a gate-body contact thin film transistor having the body contact region connected to the gate electrode so that a predetermined voltage can be provided to the channel region. | 02-05-2009 |
20090045752 | Display Device and Method of Manufacturing the Same - The invention provides a display device which can reduce breaking of a TFT substrate at the time of connecting a wiring member to the TFT substrate after decreasing a thickness of the TFT substrate and a manufacturing method of the display device. A TFT substrate and a counter substrate are adhered to each other to form a display panel. After connecting a wiring member to a line connection portion of the display panel, a portion of the display panel to be etched is masked. An etching protective film formed of an organic film is applied to the masked display panel by coating. Thereafter, a mask is peeled off together with the etching protective film formed on the mask and the display panel is immersed in an etchant thus polishing an exposed surface of a glass substrate to a predetermined thickness. Thereafter, a chemical polishing protective film formed on a wiring member is removed. | 02-19-2009 |
20090058309 | FIELD EMISSION DEVICE - Disclosed is a field emission device. The field emission device includes: an anode substrate including an anode electrode formed on a surface thereof and a fluorescent layer formed on the anode electrode; a cathode substrate disposed opposite to and spaced apart from the anode substrate, and including at least one cathode electrode formed toward the anode substrate and a field emitter formed on each cathode electrode; and a gate substrate having one surface in contact with the cathode substrate, wherein the gate substrate include gate insulators surrounding the field emitters and having a plurality of openings exposing the field emitters, and a plurality of gate electrodes formed on the gate insulators around the openings and electrically isolated from one another. Thus, when the trajectories of the electron beams emitted from the emitters are rapidly changed over time by a voltage difference between the gate electrodes, an electron beam-scanned area can be expanded due to residual images and the electron beam can be more uniformly emitted due to an electron beam scattering effect and a linear beam spreading effect, resulting in improved emission uniformity of the fluorescent layer. | 03-05-2009 |
20090066259 | ORGANIC LIGHT EMITTING DIODE DEVICE AND METHOD FOR MANUFACTURING THE SAME - An organic light emitting diode device and a method of manufacturing the organic light emitting diode device are disclosed. The organic light emitting diode device includes a substrate, a switch thin film transistor on a first side of the substrate to perform a switching function and a driving thin film transistor on the first side of the substrate to perform a driving function, a pixel electrode electrically connected to the driving thin film transistor, a common electrode to form an electric field together with the pixel electrode, the common electrode corresponding to the pixel electrode, an organic light emitting layer disposed between the pixel electrode and the common electrode to generate light, a color filter overlapping the pixel electrode to convert the light generated from the organic light emitting layer into a prescribed color of light, and an absorption layer formed on a second side of the substrate facing the first side to absorb cyan spectrum of light. | 03-12-2009 |
20090066260 | Driving circuit for a display panel and a display having same - There is provided a driving circuit capable of driving current flowing in cathode electrodes with high accuracy and displaying without brightness variation. For driving a cathode electrode in a display panel, a first current mirror circuit is fabricated by connecting a gate of first FET and a gate of second FET and a second current mirror circuit is fabricated by connecting a gate of a third FET connected in series to the second FET and a gate of a fourth FET. A brightness signal controls the magnitude of current flowing in the first FET, so that the current flowing to the cathode electrode via the fourth FET can be controlled with high accuracy. | 03-12-2009 |
20090072751 | Light emitting device - A light emitting device includes an optical cavity in resonance with an optical transition of a material disposed in the cavity. The device can form an exciton-polariton state. | 03-19-2009 |
20090079350 | Semiconductor Device, Display Device Having The Same and Electronic Appliance - The present invention provides a semiconductor device and its driving method in which amplitude of a data line is decreased to reduce power consumption. In a reset period, a reset transistor and a switch transistor are turned on. In the reset period, an input of a potential from the reset transistor node G is dominant in a node D, and a selection transistor is turned off when a potential of the node D gets higher than a gate potential of the selection transistor. Thus, even though a potential of the data line changes, a potential of the node G does not change. Since the potential of the data line is not directly written in a gate of a driver transistor, it is possible to separately set an on/off potential to be applied to the gate of the driver transistor and the amplitude of the data line. | 03-26-2009 |
20090079351 | ELECTROLUMINESCENCE DISPLAY PANEL AND DRIVING METHOD THEREOF - The present invention relates to an electroluminescence display panel and a method of driving the same. The electroluminescence display panel comprises a plurality of pixels arranged in a matrix, each of the pixels including a red sub-pixel, a green sub-pixel and a blue sub-pixel. The blue sub-pixel includes at least a first blue sub-sub-pixel and a second blue sub-sub-pixel. In operation, the first blue sub-sub-pixel and the second blue sub-sub-pixel are alternately driven among frames. | 03-26-2009 |
20090108763 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A pixel includes a light emitting diode, and a switching circuit that is coupled to a data line and a compensation power source line, and includes a transistor including a control terminal, a first main terminal coupled to a power source line, and a second main terminal coupled to the light emitting diode. The switching circuit generates a control signal based on at least a voltage of a data signal transmitted through the data | 04-30-2009 |
20090140661 | Organic electroluminescence display and driving method thereof - An organic electroluminescence display device is disclosed. The display comprises pixels which emit light according to data signals by controlling current from a pixel power supply through an organic light emitting diode, and to a ground power supply. In order to eliminate an initial glare, the pixel power supply is gradually provided to the pixels, and after a delay, the ground power supply is then gradually provided to the pixels. | 06-04-2009 |
20090153064 | Electronic Circuit for Driving Electroluminescent Display - An electroluminescent circuit for driving an electroluminescent display having a plurality of segment electrodes and a common electrode. The circuit comprises a DC power supply, an output terminal for each of the segments and common electrodes and at least one supply half H-bridge for connecting at least one of each of the segment electrodes and the common electrode selectively to one of the DC supply and a reference voltage. Each supply half H-bridge comprises a top switch and a bottom switch in series having a junction between them. The top switch is connected to the DC supply and the bottom switch is connected to a reference voltage. A discharge circuit is provided for selectively discharging the electroluminescent display, the discharge circuit comprising a discharge half H-bridge in which a top switch is connected to the DC supply and to a discharge path. | 06-18-2009 |
20090179572 | Light-Emitting Device - The amplitude of a potential of a signal line is decreased and a scan line driver circuit is prevented from being excessively loaded. A light-emitting device includes a light-emitting element; a first power supply line having a first potential; a second power supply line having a second potential; a first transistor for controlling a connection between the first power supply line and the light-emitting element; a second transistor, which is controlled in accordance with a video signal, whether outputting the second potential applied from the second power supply line or not; a switching element for selecting either the first potential applied from the first power supply line or the output of the second transistor; and a third transistor for selecting whether the first potential or the output of the second transistor which is selected by the switch is applied to a gate of the first transistor. | 07-16-2009 |
20090189532 | ELECTROLUMINESCENT DEVICE HAVING IMPROVED BRIGHTNESS UNIFORMITY - An electroluminescent device having an opposing EL-segment pair, including a first EL-segment that produces light in response to a first through-device current having a first transparent electrode connection and a first reflective electrode connection; a second EL-segment that produces light in response to a second through-device current, and having a second transparent electrode connection and a second reflective electrode connection and being disposed adjacent to and spaced from the first EL-segment such that the first transparent electrode connection is on the opposite edge as the second transparent electrode connection and the direction of the first transparent electrode current is parallel but opposite to the direction of the second transparent electrode current; and the first and second EL-segments are connected to a common power source such that the two EL-segments can be simultaneously forward biased. | 07-30-2009 |
20090206761 | OLED LIGHT SOURCE - Organic light emitting diode (OLED) light source includes a plurality of stacked organic light emitting diode units comprised of a removable topmost organic light emitting diode unit and one or more removable underlying organic light emitting diode units. A power source is in electrical communication with the anode and the cathode of the topmost organic light emitting diode unit, wherein the underlying organic light emitting diode units are free from contact with the power source. As such, each OLED is sequentially operated upon removal of the topmost OLED unit, thereby providing redundancy as well as extending the operating lifetime of the OLED light source. Also disclosed are processes for operating the OLED light source. | 08-20-2009 |
20090230873 | DRIVING CIRCUIT FOR LIGHT EMITTING DIODES - A driving circuit includes a DC-to-DC voltage converter, a current source, a detector and a feedback control circuit. The DC-to-DC voltage converter has a switch and generates a driving voltage on first ends of the series of light emitting diodes, in which a magnitude of the driving voltage is correlated with conduction of the switch. The current source is coupled to second ends of the series of the light emitting diodes and provides driving currents flowing through the light emitting diodes. The detector generates a feedback voltage corresponding to a sum of voltages on the second ends of the series of the light emitting diodes. The feedback control circuit generates a first control signal which controls the conduction of the switch in response to the feedback voltage. | 09-17-2009 |
20090243498 | Electroluminescent display devices - The pixels of an active matrix display device have a current-driven light emitting display element, a drive transistor for driving a current through the display element, a storage capacitor for storing a pixel drive voltage to be used for addressing the drive transistor, a light-dependent device for detecting the brightness of the display element, and driver circuitry for providing data signals to the pixel external to the pixel array. This provides a pixel with optical feedback to compensate for display element ageing. The driver circuitry has a processing means for processing the feedback brightness signals and derives from them a threshold voltage for the drive transistor of the pixel as well as information relating to the performance of the display element, for ageing compensation. | 10-01-2009 |
20090243499 | METHODS FOR DRIVING AN OLED PANEL - A method for driving an organic light emitting display (OLED) panel having a plurality of organic light emitting diodes is provided. The organic light emitting diodes are coupled to a plurality of segment lines and a plurality of common lines in a matrix structure. The organic light emitting diodes coupled to the same common lines are divided into a plurality of groups according to colors of the OLED panel. Driving currents are provided to the organic light emitting diodes of the groups according to a plurality of pulse width modulation (PWM) manners. The PWM manners generate waveforms having pulse width corresponding to grayscale in a period, wherein each PWM manner corresponds to different colors of the OLED panel. | 10-01-2009 |
20090261740 | LED DRIVER STRUCTURE - The present invention discloses an LED driver structure, which obtains input power coming from a power source to generate a constant-current power to drive a plurality of LEDs, and which comprises: a plurality of diode groups connected in parallel, a first piezoelectric conversion unit and a second piezoelectric conversion unit respectively arranged at both sides of the diode groups. The first and second piezoelectric conversion units receive the input power and opposite-phase convert the input power into driving powers to drive the diode groups. Among the plurality of diode groups, at least one diode group is formed of a plurality of LEDs. Each of the first and second piezoelectric conversion units has a piezoelectric inverter, which can easily achieve an impedance matching and a constant-current power to drive LEDs via a piezoelectric effect. Besides, the present invention also has the advantage of cost efficiency. | 10-22-2009 |
20090261741 | Cover figure-displaying device for an electronic device - A cover figure-displaying device for an electronic device includes a cover, a controller, and a light-emitting matrix. The cover has at least one figure. The controller has GPIO pins. The light-emitting matrix includes at least one light-emitting device connected with the controller. The controller controls the GPIO pins to select the lighting position, color, timing, and duration on the light-emitting matrix. | 10-22-2009 |
20090267526 | ORGANIC LIGHT-EMITTING DIODE DISPLAY DEVICE - A display device includes a display panel, a power transmitting member and a heat diffusing member. The display panel includes a base substrate, a power input part, a power signal line and a display element. The base substrate has an upper surface and a lower surface opposite the upper surface. The power input part is formed in an outer peripheral area of the upper surface. The power signal line is electrically connected to the power input part. The display element is electrically connected to the power signal line and generates light based on a power signal transmitted via the power input part. The power transmitting member is electrically connected to the power input part to transmit the power signal to the power input part. The heat diffusing member is disposed on the lower surface, and includes a guide groove into which the power transmitting member is disposed. | 10-29-2009 |
20090284158 | ORGANIC LIGHT EMITTING DEVICE BASED LIGHTING FOR LOW COST, FLEXIBLE LARGE AREA SIGNAGE - The present techniques provide light emitting assemblies that include two or more light emitting devices joined into a single multilayered structure. Each device is electrically contiguous, and includes an electroluminescent polymer layer between two electrodes. In each device, the electroluminescent polymer layer and/or at least one of the two electrodes is patterned to form an illuminated design. Each device may be separately energized to illustrate a different pattern or design. In some embodiments, a layer having a contiguous light emitting layer may be attached to the back of the multilayer structure. | 11-19-2009 |
20090309503 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel for compensating for the threshold voltage of a drive transistor and the voltage drop of a first power source is provided. The pixel includes an organic light emitting diode; a driving transistor coupled between a first power source and the organic light emitting diode for controlling the current supplied to the organic light emitting diode; an emission control transistor coupled between a first electrode of the driving transistor and the first power source and configured to be turned off when a high light emission control signal is applied; a switching transistor coupled between a gate electrode of the driving transistor and a data line and configured to be turned on when a low scan signal is applied; a first capacitor coupled between the gate electrode of the driving transistor and the first electrode of the driving transistor; and a second capacitor coupled between the first electrode of the driving transistor and the first power source. | 12-17-2009 |
20100060176 | DISPLAY APPARATUS - A display apparatus, including an active matrix substrate with an array of multiple pixel circuits, each having a light emitting element, a drive transistor connected to the light emitting element to apply a drive current to the light emitting element, a capacitor element connected between a gate terminal and the source terminal of the drive transistor, and a selection transistor connected between the gate terminal of the drive transistor and a data line through which a predetermined data signal flows, in which the drive transistor is an n-type thin film transistor having a current characteristic in which a drive current at a gate-source voltage Vgs=0V corresponds to an average drive current Idavr. | 03-11-2010 |
20110156599 | ELECTRONIC MODULE, METHODS OF MANUFACTURING AND DRIVING THE SAME, AND ELECTRONIC INSTRUMENT - An electronic module includes an EL section; a first substrate on which the EL section is formed; a second substrate attached to the first substrate; an integrated circuit chip mounted on the second substrate; a plurality of first power supply interconnects formed on the first substrate, extending through a pair of regions located on both sides of the EL section; and a plurality of second power supply interconnects formed on the second substrate, extending through a pair of regions located on both sides of the integrated circuit chip. | 06-30-2011 |
20110181192 | IMAGE DISPLAY DEVICE AND DRIVING METHOD THEREOF - An image display device includes luminescence pixels arranged in rows and columns. The image display device includes a first signal line and a second signal line, first control lines, and at least two drive blocks. Each drive block is composed of luminescence pixels in at least two of the rows. Each luminescence pixel includes a luminescence element and a current controller. Each of the luminescence pixels that belong to a k | 07-28-2011 |
20110221351 | Active matrix organic electroluminescence device and a method of manufacture - The present invention discloses an active matrix organic electroluminescence device comprising a thin-film transistor, an organic electroluminescence device, and an interlayer deposited between the thin-film transistor and the organic electroluminescence device, wherein the interlayer is made of cationic ultraviolet-curing adhesive comprising epoxy resin or modified epoxy resin, diluting agent, cationic photo initiator. The interlayer solves poor adhesiveness between the driving circuit and the organic electroluminescence device, and improves the moisture and oxygen proof ability. The preparation method is simple, effective, and able to lower the cost and difficulty, and greatly improve the yield rate. | 09-15-2011 |
20110316431 | DISPLAY DEVICE - A display device includes a display unit in which display elements provided with pixel circuits are arranged so as to have a sequence of three different colors in a row direction and the colors are shifted in a column direction by 1.5 columns. A scanning line is provided in every row of the display unit, a signal line is provided in every column of the display unit, and a column control circuit outputs a display signal for every column. The positions of the pixel circuits are displaced in the row direction with respect to the arrangement of the display elements, and are thus aligned in the column direction and also connected to the signal line only on one side of the signal line. No inversion of the pixel circuit pattern occurs and variations of the circuit characteristics in every row are suppressed. | 12-29-2011 |
20130193858 | SPONTANEOUS LIGHT EMITTING DEVICE AND DRIVING METHOD THEREOF | 08-01-2013 |
20130342114 | POWER UNIT AND ORGANIC LIGHT EMITTING DISPLAY DEVICE HAVING THE SAME - A power unit in an organic light emitting display device is disclosed. The power unit includes a first transistor that turns-on or turns-off in response to a first control signal, the first transistor being coupled between a constant high power voltage and a first output node, a second transistor that turns-on or turns-off in response to a second control signal, the second transistor being coupled between a ground voltage and the first output node, a diode of which an anode electrode is coupled to a variable high power voltage, and a third transistor that turns-on or turns-off in response to a third control signal, the third transistor being coupled between a cathode electrode of the diode and the first output node. | 12-26-2013 |
20140035470 | IMAGE DISPLAY DEVICE AND DRIVING METHOD THEREOF - An image display device includes luminescence pixels arranged in rows and columns. The image display device includes a first and second signal lines, first control lines, and at least two drive blocks. Each drive block is composed of luminescence pixels in at least two rows. Each luminescence pixel includes a luminescence element and a current controller. Each luminescence pixel that belongs to a k | 02-06-2014 |
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 |