Patent application number | Description | Published |
20080259015 | LIQUID CRYSTAL DISPLAY ELEMENT, DRIVING METHOD OF THE SAME, AND ELECTRONIC PAPER HAVING THE SAME - A method of driving a liquid crystal display element includes a first step for initializing a liquid crystal in a pixel and displaying an initial grayscale at the pixel and a second step for displaying a desired grayscale lower than the initial grayscale by making a cumulative time difference between low grayscales lower than a reference grayscale longer than a cumulative time difference between high grayscales higher than the reference grayscale, where the cumulative time differences are a difference between a cumulative voltage application time of voltage pulses cumulatively applied to display a grayscale lower than the initial grayscale and a cumulative voltage application time of the voltage pulses cumulatively applied to display a grayscale one level lower than the grayscale lower than the initial grayscale. | 10-23-2008 |
20080273023 | DISPLAY ELEMENT DRIVE METHOD, DISPLAY ELEMENT AND ELECTRONIC TERMIAL - The embodiment relates to a display element drive method performing write at a low speed for still image display and in particular, to a method for driving a display element using cholesteric liquid crystal (electronic paper). The display element includes a plurality of scan electrodes and data electrodes intersecting one another in the opposed state. The drive method executes an empty scan for the scan electrodes before performing an image write process. The scan electrodes are selected in a predetermined sequence and an image write process is performed. According to the drive method, it is possible to suppress a large inrush current generated immediately after the image write. Moreover, it is possible to use a cheap general-purpose driver, apply the method to a cell-less display device, and achieve power saving and a stable display quality. | 11-06-2008 |
20080291187 | DRIVE METHOD AND DISPLAY DEVICE OF DISPLAY ELEMENT - In a method of driving a display element, the display element has a plurality of first electrodes and a plurality of second electrodes intersecting each other in mutually opposing state, and a display medium between each of the first electrodes and each of the second electrodes. The display medium is driven by a first driver coupled with the first electrodes and a second driver coupled with the second electrodes, and one of the first and second drivers is used as a scan driver whereas the other of the first and second drivers is used as a data driver. Of the partial rewritten areas in the existing display image, the area having a smaller number of electrodes corresponding thereto is selected as the scan driver. | 11-27-2008 |
20090027326 | DISPLAY ELEMENT, METHOD OF DRIVING THE SAME, AND ELECTRONIC PAPER INCLUDING THE SAME - The present invention provides a display element capable of allowing a user to recognize the content of an image in a short time during screen rewriting, a method of driving the same, and an electronic paper including the same. At the time of image display, B and R pixels | 01-29-2009 |
20090027577 | LIQUID CRYSTAL DISPLAY ELEMENT, ELECTRONIC PAPER HAVING THE SAME, AND IMAGE PROCESSING METHOD - The liquid crystal display element includes a display unit having a liquid crystal layer forming a cholesteric phase and another liquid crystal layer formed on a display surface side of the liquid crystal layer. The element further includes a control unit for converting an input gray level value of input image data into a first display gray level value to generate first display image data to be displayed by the first liquid crystal layer and converting an input gray level value of the input image data into a second display gray level value different from the first display gray level value to generate second display image data to be displayed by the second liquid crystal layer. | 01-29-2009 |
20090058779 | LIQUID CRYSTAL DISPLAY ELEMENT, METHOD OF DRIVING THE SAME, AND ELECTRONIC PAPER INCLUDING THE SAME - The prevent invention provides a liquid crystal display element capable of displaying an image in a short time during screen rewriting, a method of driving the same, and an electronic paper including the same. A liquid crystal display element includes: B, G, and R display units that have liquid crystal layers (not shown in FIG. | 03-05-2009 |
20090066628 | LIQUID CRYSTAL DISPLAY ELEMENT, METHOD OF DRIVING THE SAME, AND ELECTRONIC PAPER USING THE SAME - A method of driving a liquid crystal display element that applies an AC pulse voltage to drive liquid crystal includes: when the temperature of the liquid crystal is higher than a reference temperature, generating the AC pulse voltage for high temperature having a pulse width that is shorter than a reference pulse width of a reference AC pulse voltage used at the reference temperature; and applying the generated AC pulse voltage to the liquid crystal in a period that is equal to the reference pulse width. | 03-12-2009 |
20090153757 | LIQUID CRYSTAL DISPLAY ELEMENT, METHOD OF DRIVING THE ELEMENT, AND ELECTRONIC PAPER HAVING THE ELEMENT - The invention relates to a liquid crystal display element for displaying an image by driving a liquid crystal and provides a liquid crystal display element capable of multi-level display of high display quality using general-purpose drivers, a method of driving the element, and electronic paper having the element. To display gray level “4”, a pulse voltage of ±32 V is applied at a first step to put a cholesteric liquid crystal in a planar state (level “7”)). Then, a pulse voltage of ±24 V is applied for 2.0 ms at a sub-step to the cholesteric liquid crystal to change the gray level to level “5” that is two steps lower. A pulse voltage of ±24 V is applied for 1.0 ms at another sub-step to cause a further transition of the cholesteric liquid crystal toward a focal conic state, thereby obtaining gray level “4” that is one step lower than level “5”. | 06-18-2009 |
20090161052 | DISPLAY ELEMENT, ELECTRONIC PAPER USING THE ELEMENT, AND ELECTRONIC TERMINAL USING THE ELEMENT - A display element comprises: a pair of substrates disposed opposite to each other; a liquid crystal enclosed between the pair of substrates; a wall structure which is formed to surround a pixel region and which is in contact with both of the pair of substrates; and an opening section which is an opening provided in a part of the wall structure to allow the liquid crustal to flow out of the pixel region. | 06-25-2009 |
20090174640 | DISPLAY ELEMENT, IMAGE REWRITING METHOD FOR THE DISPLAY ELEMENT, AND ELECTRONIC PAPER AND ELECTRONIC TERMINAL UTILIZING THE DISPLAY ELEMENT - The present invention relates to a display element, an image rewriting method for the display element, and electronic paper and an electronic terminal utilizing the display element and provides a display element having high display quality, an image rewriting method for the display element, and electronic paper and an electronic terminal utilizing the display element. Based on information on the temperatures and times at which first and second image rewrites are performed and information on the size and position of a region which is the subject of a partial rewrite, a selection is made to rewrite a display area as a whole or a region that is a part of the display area including the region under a partial rewrite when the second rewrite is performed. | 07-09-2009 |
20090174641 | METHOD OF DRIVING LIQUID CRYSTAL DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY APPARATUS - A drive circuit of a liquid crystal display device includes a driver circuit that applies a voltage pulse to a liquid crystal of the liquid crystal display device, and a control circuit that controls the driver circuit to change the liquid crystal to a initial tone and to change the initial tone to a high tone, an intermediate tone, or a low tone. The control circuit sets a tone energy difference so as to be smaller at the intermediate tone than at the high tone close to the initial tone, the tone energy difference being a difference between an application energy of the voltage pulse applied to the liquid crystal of the initial tone to display a predetermined tone and an application energy of the voltage pulse applied to display a tone different from the predetermined tone. | 07-09-2009 |
20090272942 | Liquid crystal composition, liquid crystal display element using the same, and electronic paper including the same. - The invention has an object to provide a liquid crystal composite capable of sufficiently reducing the scattering of light in a focal conic state, a liquid crystal display element excellent in improvements of a color balance and a contrast, and electronic paper using the same. The content of a chiral material is higher in a cholesteric liquid crystal LCg for G than in a cholesteric liquid crystal LCb for B, and is higher in a cholesteric liquid crystal LCr for R than in the cholesteric liquid crystal LCg for G. The cholesteric liquid crystal LCr for R is prepared by mixing about 5 wt % of a chiral material CHl1 of an L-form with a base liquid crystal of an R-form, which contains 27 wt % of CHr1 of the R-form exhibiting a liquid crystallizability for a nematic liquid crystal LCn, and 3 wt % of a chiral material CHr2 of the R-form exhibiting no crystallizability. | 11-05-2009 |
20090316091 | LIQUID CRYSTAL DISPLAY AND ELECTRONIC PAPER UTILIZING THE DISPLAY - The liquid crystal display includes a first display unit, a second display unit, a light absorbing layer disposed on a bottom surface of the first display unit so as to absorb light which has entered the first display unit through a top surface thereof and which has been transmitted by the first liquid crystal, and a control circuit section for effecting a switch between a two-surface display mode in which the second display unit is lapped over the first display unit so as to face the bottom surface thereof with the light absorbing layer interposed between them to display images independent of each other on the first display unit and the second display unit and a high image quality mode in which the second display unit is lapped over the first display unit so as to face the top surface thereof to display the same image on the first and second display units. | 12-24-2009 |
20090316103 | LIQUID CRYSTAL DISPLAY AND ELECTRONIC APPARATUS HAVING THE SAME - A liquid crystal display includes a display section performing display using a liquid crystal, a substrate disposed to face a bottom surface of the display section and having a circuit for driving the liquid crystal mounted thereon, and a heat diffusing section disposed in contact with the bottom surface of the display section and a top surface of the substrate and having thermal conductivity higher than the thermal conductivity of air. | 12-24-2009 |
20090322663 | DISPLAY DEVICE - A display device with low power consumption capable of canceling the collapse of gradation and skip of gradation in a high gradation part and a low gradation part and of displaying an even gradation in a wide range has been disclosed. The display device comprises a display element of dot matrix type having a display material with memory properties, a drive circuit that drives a pixel of the display element, and a control circuit that controls the drive circuit, wherein the control circuit executes an initialization step for applying a voltage pulse to initialize a pixel to be rewritten to bring the pixel into an initialization state and a gradation step for applying a voltage pulse to change the gradation state of a pixel, and in the gradation step, an alternating voltage pulse is formed in a pixel to be rewritten and the period and voltage of the alternating voltage pulse are varied in accordance with a gradation to be written. | 12-31-2009 |
20100013807 | DISPLAY DEVICE - A display device has a display panel having a first substrate in which a plurality of first electrodes are disposed in parallel, a second substrate in which a plurality of second electrodes crossing the first electrodes are disposed in parallel, and a material layer which is disposed between the first and second substrates and reflects, transmits or absorbs light with a predetermined wavelength according to a write state; | 01-21-2010 |
20100020055 | DISPLAY DEVICE DRIVING METHOD AND DISPLAY DEVICE - A display device includes a liquid crystal display panel having a first and second substrates with scanning electrodes and data electrodes and a liquid crystal layer; a scanning electrode driving circuit applying to the scanning electrodes scan pulse; a data electrode driving circuit applying to the data electrodes data pulses having combinations of different voltage levels according to write data; and a driving control circuit supplying to the scanning and data electrode driving circuits a pulse control signal controlling the phase of the scan pulses and data pulses. The scanning and data electrode driving circuits control the scan pulses and data pulses at voltage levels according to the pulse control signal, and the driving control circuit inverts or does not invert the phase of the pulse control signal, at each application interval of the scan pulses, according to the number of changed values and unchanged values of the write data. | 01-28-2010 |
20100073343 | LIQUID CRYSTAL DISPLAY DEVICE - A LCD device, in which a multi-grayscale level state is produced in a liquid crystal layer by applying a different voltage thereto, includes a liquid crystal display panel having the liquid crystal layer between first and second electrodes, an electrode drive circuit applying drive voltage pulses generated from multi-voltage power sources to the first and the second electrodes, and a multi-voltage power generator circuit. The LCD device further includes a multi-voltage power switch circuit supplying the first or the second multi-voltage power sources from the first or the second multi-voltage power units to the electrode drive circuit, and a control circuit, in a first drive step, setting the first multi-voltage power unit to an active state, and, in a second drive step, setting the second multi-voltage power unit to the active state. | 03-25-2010 |
20100134537 | DESIGN SUPPORT METHOD - The display apparatus includes a dot matrix type display device including a display material; a driver circuit that passively drives a plurality of pixels in the display device; and a control circuit that controls the driver circuit. The control circuit applies a voltage pulse to initialize a plurality of pixels to be rewritten and applies a voltage pulse to change a tone state of the plurality of pixels and display the tone. The voltage pulse to be applied for the tone display includes an all-selected voltage pulse to be applied to a plurality of pixels the tone state of which are changed, and a half-selected voltage pulse and a non-selected voltage pulse to be applied to a plurality of pixels the tone state of which are not changed, and a ratio of the all-selected voltage to the half-selected voltage is larger than 2 | 06-03-2010 |
20100149209 | DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - The invention provides a display device and a method of driving the same in which degradation of display quality attributable to image sticking can be prevented while maintaining a memorized state of display. The display device includes a display section displaying a memorized display image which is kept displayed without electric power, a correction data generating section generating correction data for correcting a display characteristic of the display section which has changed due to sticking of the memorized display image, a corrected image data generating section generating corrected image data by correcting image data of a next image to be displayed next on the display section using the correction data, and a control section causing the display section to display the next image according to the corrected image data. | 06-17-2010 |
20100188380 | DISPLAY DEVICE INCLUDING A DISPLAY ELEMENT OF DOT MATRIX TYPE AND A DRIVE METHOD THEREOF - A display device includes a display element of a dot matrix-type having a display material with memory properties, a drive circuit that drives a pixel of the display element and a control circuit that controls the drive circuit, the control circuit includes an initialization step for applying a voltage pulse to initialize a pixel to be rewritten to bring about an initial gradation state and a gradation step for applying a voltage pulse to change the gradation state of a pixel, and the gradation step includes a plurality of sub-steps having a plurality of execution times and in the plurality of sub-steps, an alternating-current voltage pulse is formed in a pixel to be rewritten and the period of the alternating-current voltage pulse is varied in accordance to a gradation to be written within the range of the sub-step. | 07-29-2010 |
20100194736 | DISPLAY DEVICE HAVING DISPLAY ELEMENT OF SIMPLE MATRIX TYPE, DRIVING METHOD OF THE SAME AND SIMPLE MATRIX DRIVER - A display device includes: a matrix-type display element; a row driver that drives a scan electrode of the display element; and a column driver that drives a data electrode of the display element, in which the column driver includes a matrix driver in a segment mode, the row driver includes a matrix driver being switched between the segment mode and a common mode, and the writing of image data to the display element is performed by: invalidating the output of the row driver and the column driver; setting the row driver to the segment mode; and validating the output of the row driver and the column driver after writing selected line specification data to the row driver and writing image data to the column driver, and then setting the row driver to the common driver. | 08-05-2010 |
20100194794 | DISPLAY DEVICE HAVING DISPLAY ELEMENT OF DOT MATRIX TYPE AND A DRIVE METHOD OF THE SAME - A display device includes a matrix-type display element, a drive circuit, a control circuit, and a temperature sensor, the control circuit controls the drive circuit so that an initialization pulse to initialize a pixel to be rewritten is applied to bring about an initial gradation state and then a gradation pulse is applied to the initialized pixel to bring about a gradation state, the cumulative time during which the gradation pulse is applied is related to the value of the gradation state, the control circuit fixes the pulse voltage of the initialization pulse and varies the pulse width of the initialization pulse in accordance with the temperature detected by the temperature sensor, and varies the pulse width of the gradation pulse when the temperature is low and varies the pulse voltage of the gradation pulse when the temperature detected is high. | 08-05-2010 |
20100225677 | DISPLAY APPARATUS, DRIVING METHOD AND DISPLAY DRIVING CONTROLLER OF CHOLESTERIC LIQUID CRYSTAL DISPLAY PANEL - A display apparatus includes a cholesteric liquid crystal display panel, a control circuit and a driving circuit. The control circuit classifies pixels into different gradation level groups. The driving circuit applies a first driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the first and the fourth group into a state corresponding to the highest gradation level, pixels belonging to the second group into a state corresponding to the lowest gradation level, and pixels belonging to the third group into states corresponding to gradation levels to be displayed, and applies a second driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the fourth group into states corresponding to gradation levels to be displayed. | 09-09-2010 |
20110074764 | LIQUID-CRYSTAL DRIVING METHOD AND DEVICE - A liquid-crystal driving method includes: setting a reset line, a writing line, and a non-select line in a direction parallel to a plurality of common electrodes, the plurality of the common electrodes and a plurality of segment electrodes being arranged in a matrix form; dividing a driving period into a reset period and a write period; applying a first voltage during the reset period spanning n lines before writing data into the writing line by one of the plurality segment electrodes during the write period, where n is a positive integer; applying a second voltage during the reset period spanning m lines and the write period, where m is a positive integer; and driving a liquid-crystal pixel provided at each intersection of the common electrodes and the segment electrodes. | 03-31-2011 |
20110122109 | REFLECTIVE DISPLAY DEVICE AND CONTROL CIRCUIT FOR REFLECTIVE DISPLAY DEVICE - There is provided a reflective display device that includes an illuminance detector configured to detect illuminance, a chroma corrector configured to correct chroma of image data in accordance with the illuminance detected by the illuminance detector, and a display element configured to display image data corrected by the chroma corrector. | 05-26-2011 |
20110122115 | REFLECTION-TYPE DISPLAY APPARATUS - A reflection-type display apparatus includes: scan electrodes and signal electrodes that are provided in matrix form; a setting circuit configured to set at least one of scan electrodes as one of a reset line, a writing line and a non select line, the reset line and the writing line being in a selected state, the non select line being in an unselected state; a supply circuit configured to supply image data to at least one of signal electrodes while shifting the reset line, the non select line or the writing line; an extraction circuit configured to extract a writing line corresponding to a pixel which is not changed to a certain display state based on the image data; and a control circuit to set a first scan speed to the extracted writing line, the first scan speed being different from a second scan speed set to an un-extracted writing line. | 05-26-2011 |
20110122346 | LAMINATED-TYPE DISPLAY DEVICE - There is provided a laminated type display device that includes a plurality of display elements. Each of the plurality of the display elements is configured to reflect respective colors and each of the respective colors is different from each other. Each of the plurality of the display elements includes respective transparent electrodes of which spectral characteristics are different each other. | 05-26-2011 |
20110187763 | DISPLAY AND COMPUTER READABLE MEDIUM - A display includes: an image data storage unit that stores image data; a display image data generation unit that synthesizes the image data with data of a noise pattern image with no correlation to the image data, and generates display image data; and a display unit that displays an image based on the display image data generated by the display image generation unit, and maintains a display without power supply. | 08-04-2011 |
20110210953 | LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DRIVING METHOD - A liquid crystal display device includes a segment driver, a common driver, and a voltage setting unit. The voltage setting unit derives a voltage at which a previous drive line becomes a focal conic state regardless of image data by applying a synthesized voltage of a voltage that is applied from the segment driver and a voltage that is applied from the common driver to the previous drive line. Then, the voltage setting unit sets the voltages that are applied from the segment driver and the common driver on the basis of the derived result. | 09-01-2011 |
20110261091 | DISPLAY DEVICE AND COMPUTER READABLE MEDIUM - A display device includes: a data storage unit that stores image data; a display image data generation unit that generates display image data by adding a noise pattern, of which a polarity is in accordance with a gray level value of each pixel of the image data, to the image data; and a display unit that displays an image based on the display image data generated by the display image generation unit. | 10-27-2011 |
20110261304 | LIQUID CRYSTAL DISPLAY ELEMENT - A liquid crystal layer sandwiched by a lower substrate | 10-27-2011 |
20110310068 | DISPLAY DEVICE - A display device includes a display part, an electrode that applies a pulse to a pixel of the display part, and a control part that controls the application of the pulse, the control part controls the position of the electrode that applies the pulse so as to change at irregular intervals. The control part selects the position of the electrode that applies the pulse alternately from the center toward both ends and densely at the center and sparsely at both ends, or alternately from both ends toward the center and densely at both ends and sparsely at the center and thus selects all the electrodes. | 12-22-2011 |
20120062616 | REFLECTIVE COLOR DISPLAY ELEMENT AND COLOR DISPLAY APPARATUS - A reflective color display element includes a plurality of pixels arranged in a matrix. Each of the plurality of pixels includes a first hue element, a second hue element, and a third hue element that control a light reflection state and that exhibit three different hues. Reflection spectra of the first hue element, the second hue element, and the third hue element partially overlap. | 03-15-2012 |
20120062808 | CHOLESTERIC LIQUID CRYSTAL DISPLAY DEVICE AND SIMPLE MATRIX DRIVING METHOD - A cholesteric liquid-crystal display device includes a cholesteric liquid-crystal display element having common electrodes and segment electrodes; a common driver which drives the common electrodes, outputs a selected-line voltage to a selected line of the common electrodes, and outputs an unselected-line voltage to unselected lines other than the selected line; a segment driver which drives the segment electrodes and outputs a write signal to the segment electrodes; a drive controlling circuit which controls the common driver and the segment driver to rewrite an image displayed on the cholesteric liquid-crystal display element; and a voltage correcting circuit which corrects the unselected-line voltage corresponding to the write signal during writing to the selected line. | 03-15-2012 |
20120081413 | DISPLAY APPARATUS AND METHOD FOR DRIVING DISPLAY APPARATUS - A display apparatus comprising: a display device comprising a cholesteric liquid crystal layer and electrodes sandwiching the cholesteric liquid crystal layer and applying a voltage to a pixel; a voltage driver capable of applying a first pulse and a second pulse to the electrodes, the first and second pulses having different polarities; and a directing circuit directing the voltage driver as to a position to which the first pulse is to be applied and a position to which the second pulse is to be applied in a predetermined period according to a gray level to be produced in the pixel. | 04-05-2012 |
20120092576 | LIQUID CRYSTAL DISPLAY ELEMENT AND DEVICE - A liquid crystal display element includes a first and a second liquid crystal layer stacked on each other. The first liquid crystal layer includes a first liquid crystal strip group and a second liquid crystal strip group extending in a first direction and alternately aligned. A first electrode group and a second electrode group are disposed so as to hold the first liquid crystal strip group and the second liquid crystal strip group therebetween. The second liquid crystal layer includes a third liquid crystal strip group and a fourth liquid crystal strip group extending in a second direction orthogonal to the first direction and alternately aligned. A third electrode group and a fourth electrode group are disposed so as to hold the third liquid crystal strip group and the fourth liquid crystal strip group therebetween. Each electrode group includes electrodes extending in the each direction substantially parallel to each other. | 04-19-2012 |
20120127385 | LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY APPARATUS - A liquid crystal display device includes a first liquid crystal layer where first liquid crystal regions and second liquid crystal regions are alternately arranged, and a second liquid crystal layer stacked on the first liquid crystal layer where third liquid crystal regions and fourth liquid crystal regions are alternately arranged. With respect to an area per pixel, the first liquid crystal region is larger than the second liquid crystal region, and the third liquid crystal region is larger than the fourth liquid crystal region. The first liquid crystal region overlaps part of the third liquid crystal region and the fourth liquid crystal region. The first, the second, the third and the fourth liquid crystal regions cause changes in reflectance of light at respective wavelength regions in response to applied voltage. The respective wavelength regions are different from one another. | 05-24-2012 |
20130100094 | INFORMATION DISPLAY SYSTEM, DISPLAY DEVICE, DISPLAY DEVICE DRIVE METHOD AND DISPLAY APPARATUS - A display apparatus comprises a display unit capable of continuing a display even after the power is shut off, a short range communication unit for receiving display data provided externally and a display control unit for the received data, while an information display apparatus comprises a storage unit for storing display data and a communication unit for transmitting the display data over to the display apparatus, and further the information display apparatus comprises a mechanical quick release mechanism for mounting the display apparatus onto the own apparatus for example, in order to configure a system, which is capable of detachable attachment, between the display apparatus having no power supply and the information display apparatus, such as a wireless terminal, which sends display data and power to the display apparatus. | 04-25-2013 |