Abstract: A demultiplexer applies picture information to pixels arranged in an array of a display device having columns and rows. The demultiplexer includes transistor switches each having a control terminal, an input terminal and an output terminal. A first bus couples switch control signals to the control terminals of the switches. The conductors of a first bus extend in a region containing each of the switches to form a global bus arrangement. Local buses have each conductors coupled to the input terminals of the switches associated with the individual local bus. The output terminals of the switches associated with the individual local bus are coupled to corresponding, consecutively disposed column conductors of the array. The individual local bus has a section that crosses over the first bus and a second section extending between the crossover section and the input terminals of the associated switches.

Abstract: The invention provides a method for manufacturing a display device that includes a light-transmitting substrate and, above the light-transmitting substrate, a plurality of light-emitting elements arrayed in a plane, driving elements connected to the light-emitting elements, a bank layer disposed in the boundary areas between the plurality of light-emitting elements, and wires connected to the driving elements. In this method, the wires are formed by patterning a light-shielding, conductive layer on the light-transmitting substrate so as to have a shape in plan view corresponding to the shape of the bank layer in plan view. Then, the wires, acting as a mask, are exposed from the rear surface of the substrate to form the bank layer by self-aligning above the wires. Then, the light-emitting elements are formed in the areas surrounded by the bank layer.

Abstract: An ink jet print cartridge having a compact electrical interconnect structure that includes a plurality of pairs of columnar arrays of electrical contact areas disposed on a rear wall of the print cartridge and electrically connected to ink drop generators arranged in primitive groups.

Abstract: A switching electrode connected to a switching element is provided on a first substrate. An opposing electrode, an insulation film, and a plurality of sub electrodes are provided on a second substrate. Moreover, a resistant film is provided on a first substrate. A switching electrode which is connected to the switching element and an electrode which is not connected to the switching element are provided on the resistant film. An opposing electrode which is not connected to the switching element is provided on the second substrate. Furthermore, a first electrode which is connected to a first switching element and a third electrode which is not connected to the switching element are provided on the first substrate. The first and third electrodes are opposed to the second electrode, which is connected to a second switching element, via an insulator. The opposing electrode which is not connected to the switching element is provided on the second substrate.

Abstract: A liquid crystal device using a simple matrix panel which is driven by seven level potentials including PV3, PV2, PV1, VC, MV1, MV2, and MV3 in 4-line simultaneous selection driving at a high duty n1. The bias ratio c1 at this time is (PV2−VC)/L/PV3. In 4-line simultaneous selection driving at a low duty n2, the liquid crystal device is driven by five levels including PV2, PV1, VC, MV1, and MV2 by stopping the operation of third and fourth voltage raising circuits (230) and (232). The bias ratio c2 at this time is (PV2−VC)/L/PV2. When changing the duty, the relation n1·c12=n2·c22 is satisfied. This eliminates the need for contrast adjustment each time the duty is changed. A voltage-raising multiplying factor “k” in a third voltage raising circuit (230) satisfies the relation k=PV3/PV2. Therefore, n2=n1·(c1/c2)2=n1·(1/k)2 is realized.

Abstract: A compact and inexpensive LCD is provided by improving a drive method for compensating a crosstalk using a compensating pulse added to a signal voltage so that a drive IC and a periphery of the LCD panel are reduced in size. Only one of positive and negative compensating pulses is added in accordance with a predetermined period. Alternatively, the two compensating pulses are added at different times from each other in one horizontal scanning period. The compensating pulse preferably has a waveform including low frequency components. A width or a height of the compensating pulse varies in accordance with a location of the signal electrode, display pattern or other factors.

Abstract: An active matrix electroluminescent display device comprises an array of display pixels (4) arranged in rows and columns with each row of pixels sharing a common line, and with currents through the display elements of a row of pixels passing along the common line. Error values (e) are generated to correct the drive signals (V) for each pixel in a row of pixels, to correct for the different voltages appearing on the common line. These different voltages give rise to horizontal cross talk. The error values (e) are derived from a circuit (34) representing an additional row of pixels and associated with the driver circuitry (32), and result in updated drive signals (V′).

Abstract: Method reducing cross-talk between adjacent column conductors in a field emission display (10) that has a plurality of column conductors (17A, 17B, 17C, 18A, 18B, 18C) on which electron emission structures (24) are disposed. The field emission display (10), also includes a plurality of row conductors (27, 28, 29). Cross-talk is prevented by ensuring that adjacent conductors are not in an active state at the same time.

Abstract: A method for driving a liquid crystal display device is provided.

Abstract: A first sample-and-hold circuit samples and holds an input image signal so as to output an image signal to be applied to a data line causing noise. A correction circuit produces a correcting signal according to the image signal and a pre-charging voltage. An addition circuit adds up an image signal to be applied to a data line affected by the noise and the correcting signal so as to produce a corrected image signal. Consequently, when scanning lines are selected sequentially for each of blocks, into which a plurality of data lines is grouped, in order to display an image, irregular luminance occurring in portions of the displayed image coincident with the borders of the blocks is suppressed to be indiscernible.

Abstract: A video signal input selector is subject to cross coupling between selectable video signals. The input selector comprises a video amplifier coupled to amplify a video signal selected from said selectable video signals. A controllable switch has first and second elements, the first element receives the selected video and is coupled to signal ground. The second element receives the selected video and is coupled to the amplifier. During a first condition the first element is controlled to be open circuit and the second element is controlled to be short circuit coupling the selected video signal to the video amplifier. In a second condition the first element is controlled to short circuit the selected video signal to the signal ground and the second element is controlled to be open circuit substantially inhibiting the selected video signal from coupling to the video amplifier.

Abstract: The present invention provides an energy recovery driver circuit for the AC plasma display panel having an enhanced energy recovery efficiency with a short voltage rise and fall period. The energy recovery driver circuit comprises an energy recovery part interposed between the sustain driver circuits for the X1 and X2 electrodes and the other energy recovery part interposed between the sustain driver circuits for Y1 and Y2 electrodes, wherein X1 and Y1 electrodes are respectively defined as electrodes of a first and a second type of electrodes employed in the first AC-PDP cell group, and X2 and Y2 electrodes are respectively defined as electrodes of the first and the second type of electrodes employed in the second AC-PDP cell group. Thus the energy recovery circuit of the present invention utilizes the effect of reducing the load capacitance to a half of its original value, when two (2) loads are serially connected.

Abstract: The preferred embodiment of the present invention compensates for the phosphorous glow of cathode ray tube displays which is retained from one image to the next and eliminates the ghosting effect seen when viewing 3-D images using shutter, polarized or colored stereoscopic glasses. It can additionally be used to compensate for light leaking through LCD shutter glasses. The source images for each eye are not displayed directly once modulated. The source images are modified using positive and negative ratio combinations of both eye images to be displayed to each eye. The displayed image for one eye is a percentage of the source image for that eye, minus a percentage of the source image for the other eye, plus a percentage of white. The ratio can be preset or modified in real-time by the viewer.

Abstract: A compact and inexpensive LCD is provided by improving a drive method for compensating a crosstalk using a compensating pulse added to a signal voltage so that a drive IC and a periphery of the LCD panel are reduced in size. Only one of positive and negative compensating pulses is added in accordance with a predetermined period. Alternatively, the two compensating pulses are added at different times from each other in one horizontal scanning period. The compensating pulse preferably has a waveform including low frequency components. A width or a height of the compensating pulse varies in accordance with a location of the signal electrode, display pattern or other factors.

Abstract: In a plasma addressed display apparatus, a given first pixel of a plurality of pixels belongs to one of a plurality of row groups each having a plurality of continuous rows. A signal generation supply circuit receives video data and corrects first video data to be displayed by the first pixel based on a predetermined correction function that includes as variables the first video data and second video data to be displayed by a second pixel belonging to a same row group and a same column as the first pixel and belonging to a row different from the first pixel. In certain embodiments, the first and second pixels are in the same plasma discharge channel so that the first video data is corrected based upon variables relating only to pixel(s) in the same plasma discharge channel in which the first pixel is located.

Abstract: An active matrix device has a plurality of drive signals, a plurality of select signals and an array of sub-pixels. Each of the sub-pixels has an electronic element connected to one of the drive signals and one of the select signals to display. The active matrix device also includes inversion circuitry coupled to the drive signals that has at least one Cole sequence generator. A Cole sequence generator provides a random, semi-random or pseudo-random sequence pattern. The inversion circuitry is capable of reducing the direct current bias voltage applied by the electronic element to the sub-pixel. The inversion circuitry is further capable of reducing flicker of the active matrix device.

Abstract: In an operation of an address period for addressing cells of a display device, such as a plasma display panel, comprising a plurality of cells of three kinds, red (R), green (G), blue (B), which are arranged on a plane for forming a display surface thereof, in which each of said cells comprising: a pair of transparent electrodes provided in parallel to each other; an address electrode being positioned opposing the pair of transparent electrodes; luminescence medium provided on the address electrode; and a discharge space being defined between the pair of transparent electrodes and said fluorescence medium on the address electrode, wherein the address discharge is conducted by applying an address voltage to the address electrode, and the address voltage applied is determined depending upon the each kind of the cells, R, G and B.

Abstract: On a liquid crystal device substrate 1, a capacitor 85 is provided between reset signal lines 81 and 82 for applying reset potentials to the respective data lines prior to the supply of the image signals to the data lines, and a potentiostatic line 84. The capacitor 85 is formed by making use of each of the processes for producing a TFT 50 for applying the reset potentials to the respective data lines prior to the supply of the image signals to the data lines. A liquid crystal device and a projection display device employing the liquid crystal device prevent signals from circulating from data lines via a reset signal line, thus permitting higher quality of display to be achieved.

Abstract: An active matrix electroluminescent display device comprises an array of display pixels 30 arranged in rows and columns with each row of pixels sharing a common line, and with currents through the display elements of a row of pixels passing along the common line. Error values (e) are generated to correct the drive signals (V) for each pixel in a row of pixels, to correct for the different voltages appearing on the common line. These different voltages give rise to horizontal cross talk. The error values (e) are derived by modelling a row of pixels, taking into account the drive signals applied to all pixels of the row. The error values result in updated drive signals (V′).

Abstract: A method for driving a plasma display panel which can perform a good image display even if a video signal having a jitter is supplied is provided. At least one of the execution time of a pixel data writing step in each sub-field, the execution time of a light emission sustaining step, and the number of sub-fields to be executed during a display period of one field is adjusted in accordance with the jitter of a vertical sync signal in the input video signal.

Abstract: This invention relates to an auto-improving display flicker method to eliminate all possible display flicker effects. The method includes the steps: detecting the display flicker level and producing a detection voltage; comparing the detection voltage with a predetermined voltage; automatically switching the currently used inversion technique into an alternately predetermined display flicker processing technique if the detection voltage is greater than the predetermined voltage.

Abstract: A flat panel display having a programmable gamma without incidental loss in gray scale resolution. In one embodiment, the flat panel display is a liquid crystal display (LCD). The invention includes applying and adjusting a set of gamma controlling voltages to the DC reference circuit (a.k.a. ladder voltages) of an LCD module producing a change in the gamma response (or profile) of the LCD module without incidental loss of gray scale resolution. An adjustable ladder circuit (ALC) is thereby realized. Separate ALCs can be provided for red, green and blue primaries. By adjusting, in a predetermined fashion, the reference voltages applied to the row and column drivers of an LCD display, the gamma response of the LCD can be changed to a different value. Because the input digital signals are not affected, the same color resolution and dynamic range are maintained. The DC reference circuit can be a multi-node voltage divider.

Abstract: A matrix type display apparatus includes a video signal voltage compensation circuit for suppressing distortion of a video signal produced on a video signal transmission bus mainly by the wiring resistance and a parasitic capacitance. The video signal voltage compensation circuit is connected to the input end of the video signal transmission bus to compensate waveform distortion of a video signal occurring on the video signal transmission bus while it is supplied to sample-hold circuits connected to the bus. The compensation circuit also includes a filter whose correction coefficient is varied in response to elapsed time from reception of a horizontal synchronizing signal.

Abstract: A compact and inexpensive LCD is provided by improving a drive method for compensating a crosstalk using a compensating pulse added to a signal voltage so that a drive IC and a periphery of the LCD panel are reduced in size. Only one of positive and negative compensating pulses is added in accordance with a predetermined period. Alternatively, the two compensating pulses are added at different times from each other in one horizontal scanning period. The compensating pulse preferably has a waveform including low frequency components. A width or a height of the compensating pulse varies in accordance with a location of the signal electrode, display pattern or other factors.

Abstract: A plasma-addressed liquid crystal color display device comprising a layer of liquid crystal material, data electrodes coupled to the liquid crystal layer and adapted to receive data voltages for activating pixels of the liquid crystal layer, and a plurality of ionizable-gas-filled plasma channels extending generally transverse to the data electrodes for selectively switching on said liquid crystal pixels. The plasma channels are sealed off by a thin dielectric sheet. To reduce the magnitude of the data voltages needed to activate the device, the LC layers are given compositions such that a much higher fraction of the applied data voltages appears across the liquid crystal layer thereby allowing a smaller data voltage to be used to obtain the same effect on the liquid crystal pixels.

Abstract: A liquid crystal display has a liquid crystal layer, first and second electrodes, and a third electrode. The liquid crystal layer is inserted between the first and second electrodes to define liquid crystal cells. The third electrode is capacitively coupled with one of the first and second electrodes. A correction voltage for correcting distortion of a waveform for driving one of the first and second electrodes is applied to the third electrode, to keep an effective voltage applied to the liquid crystal cells unchanged and improve the display quality of the liquid crystal display. Therefore, the liquid crystal display of the present invention can correct distortion of a common voltage and prevent crosstalk.

Abstract: The elimination of crosstalk between data lines and pixel cells in a thin film transistor/liquid crystal display is accomplished by applying a precharge voltage level for a given data signal level which also provides an equivalent to a compensation voltage for a prior scan line to a given data line for a time period less than the standard scan line period of the display, and applying the data signal to the given data line for the remainder of the scan line period.

Abstract: A display device comprising a display panel, a plasma driving circuit, a correcting circuit and a display driving circuit. The display panel has a laminated structure consisting of a display cell with signal electrodes arrayed in columns, a plasma cell with discharge channels arrayed in rows, and a dielectric sheet interposed therebetween. The plasma driving circuit sequentially drives the discharge channels to address the display cell line-sequentially via the dielectric sheet, and the correcting circuit processes picture signals through a corrective arithmetic operation. And the display driving circuit supplies the processed picture signals to the signal electrodes in synchronism with the line-sequential addressing, and then writes the picture signals in pixels prescribed at the intersections of the signal electrodes and the discharge channels. The correcting circuit executes such a process as to emphasize the difference between the picture signals supplied to mutually adjacent signal electrodes.

Abstract: A structure of a liquid crystal device cutting down the power consumption is materialized. In a liquid crystal display device comprising at least two display portions of a dot matrix portion and an icon portion in the same panel, drive is carried out such that both of the display portions are displayed in a normal operation mode and, only the icon portion is displayed in a power-saving operation mode such as when the liquid crystal display device is waiting for operation or is standby. In the power-saving operation mode, the duty ratios of all of the display portions in the power-saving operation mode are lower than those in the normal operation mode, and time shared drive waveforms using the power source voltage as it is which does not require bias voltage are applied.

Abstract: A method of driving a picture display device having an N number (N is an integer of not less than 2) of scanning electrodes and a plurality of data electrodes and being capable of optically responding to an effective value of a voltage applied to a pixel, which includes dividing the scanning electrodes into an M number of subgroups each having L rows, and applying voltages based on signals formed by expanding time-sequentially column vectors of an orthogonal matrix (A) having L rows to the scanning electrodes in each of the subgroups in order to select each of the subgroups together, changing, every time when a selection pulse is applied, the subgroups to which the selection pulse is applied, wherein L is 8 or less and N is 200 or more; the polarities of scanning voltages and data voltages are inverted with a periodicity of S times (S is a natural number) of a selection pulse width, and S is so determined that when an integer portion in the quotient of M/S is an even number, a remainder b satisfies S/b<12,

Abstract: The present invention provides a method and system for reducing flicker within an interlaced image. The method and system comprises identifying an area of the interlaced image where flicker needs to be reduced and adaptively adjusting a pattern of pixels derived from a non-interlaced spatial relationship of the interlaced image within the area based upon characteristics of the image. A flicker filter is provided which utilizes an adaptive technique whereby pixel-blending characteristics are constantly changed within the image depending on particular image attributes. It is unique in that high vertical resolution is maintained for detailed image content such as text and most graphics, while flicker is effectively reduced on image content that is flicker prone. The filter is based on psycho-visual studies and simulations performed by the company as well as numerous prior flicker filter implementations.

Abstract: Disclosed are cross-talk resistant drive circuitry for electrostatic video displays and flexible, foldable and shaped embodiments of such displays including books, fanfolds and scrolls employing flexible polymer film construction. Transitorless drive circuitry uses row and column dumping capacitors to charge electrostatic pixels in a traveling group to avoid simultaneously charging row-adjacent pixels. Also, individual pixels can be shielded each with their own Faraday cage to control charge leakage from the pixel. The pixels' have spiral rollout shutters whose time parameters can be controlled by the use of suitable bleed resistors. Low-cost film technology manufacturing methods are also described.

Abstract: A liquid crystal display is provided with: a liquid crystal panel having a liquid crystal layer that is disposed between signal electrodes and scanning electrodes, a signal-side driving circuit which applies binary voltages representative of data to be displayed on the liquid crystal panel to the signal electrodes, a scanning-side driving circuit which successively applies scanning voltages to the scanning electrodes, a control circuit which controls the signal-side driving circuit so that rounded waveforms of voltages to be respectively applied to the signal electrodes are made virtually constant, and a compensation circuit which eliminates voltage distortions that are induced with respect to non-selected scanning electrodes, when the signal-side driving circuit is controlled.

Abstract: To provide a structure and a method for driving an active matrix liquid crystal display device having low electric power consumption and high quality image. The active matrix liquid crystal display device of the present invention comprises a plurality of scanning lines and a plurality of signal lines which are disposed in matrix, and a thin film transistor (TFT) and a pixel electrode corresponding to each combination of scanning line and signal line. The scanning line corresponding to each of the pixel electrodes is located on the upper and lower sides of the pixel electrode. The TFT is formed between the scanning line corresponding to the pixel electrode and upper and/or lower portion of the scanning line. An additive capacity is formed between the pixel electrode and a scanning line other than the scanning line corresponding to the pixel electrode.

Abstract: A driver circuit for driving an active matrix liquid crystal display without producing flicker. The inversion frequency of the voltage applied to the liquid crystal panel of the display is examined, the frequency being intrinsic to the display. The difference between voltages applied to opposite sides of the liquid crystal panel is found from the transmissivity of the liquid crystal material, by making use of an image sensor. The found value is converted into digital form by an analog-to-digital converter and stored in a correcting value storage device. When the active matrix display is in use, the difference signal which is found for each pixel and stored in the storage device is added to an image signal applied to the active matrix display, thus preventing flicker intrinsic to the liquid crystal panel.

Abstract: An AC plasma panel display includes front and back panels that respectively support a first parallel electrode pattern and a second orthogonally oriented, parallel electrode pattern. The electrode patterns define a display area and both patterns are covered by dielectric layers. A dischargeable gas is positioned between the dielectric layers in the known manner. Driver circuitry is coupled to both electrode patterns for creating a spatially continuous gas discharge along at least one continuous electrode of one electrode pattern and across the entire display area. The driver circuitry scans the spatially continuous gas discharge across remaining parallel electrodes of the one electrode pattern so as to scan the entire display area. A further electrode is in DC conductive communication with the gas and is positioned outside of the display area but in contact with the spatially continuous gas discharge during its scanning action.

Abstract: The elimination of crosstalk between data lines and pixel cells in a thin film transistor/liquid crystal display is accomplished by applying a precharge voltage level for a given data signal level which also provides an equivalent to a compensation voltage for a prior scan line to a given data line for a time period less than the standard scan line period of the display, and applying the data signal to the given data line for the remainder of the scan line period.

Abstract: Thin film transistor-liquid crystal displays (TFT-LCDs) are driven to compensate for voltage drops on a common electrode, and to thereby reduce or eliminate cross-talk. The TFT-LCD includes a plurality of liquid crystal cells and a plurality of thin film transistors, a respective pair of which is serially connected between a common electrode and a plurality of drivers. A sensor senses a voltage drop on the common electrode. A compensator is responsive to the sensor, to provide at least one driver signal level to the plurality of drivers, which are a function of the sensed voltage drop on the common electrode. Distortions in the liquid crystal cells which are caused by the voltage drop on the common electrode may thereby be reduced or eliminated. Improved TFT-LCDs and driving circuits and methods are thereby provided.

Abstract: A matrix display system, comprising a display panel (10) having a row and column array of light modulating picture elements (12), for example liquid crystal picture elements, and panel illuminating means (19), is operated by driving the rows of picture elements such that the display information of successive fields of an applied video signal is written into the panel in respective panel display information address periods that are substantially less than the applied video signal field period and separated by a time interval, and such that successive periods in which display fields are presented to a viewer are separated by intervals in which substantially no display output is produced. The resulting dark intervals lead to an improvement in perceived resolution of moving images. The illumination means can be controlled so as to produce a display output during at least a part of the interval and substantially no display output during at least a part of the address period.

Abstract: In a display device of the reset type, drive asymmetries in mutually offset picture electrodes (6) occur due to capacitive crosstalk differences between these picture electrodes (6) and column electrodes, and consequently lead to artifacts.These crosstalk differences are eliminated by choosing a layout for a picture electrode (6) and the surrounding electrodes (8, 18) and switching elements (9, 19), which layout, viewed in consecutive rows, is mirror-symmetrical.

Abstract: A liquid crystal display has a liquid crystal layer, first and second electrodes, and a third electrode. The liquid crystal layer is inserted between the first and second electrodes to define liquid crystal cells. The third electrode is capacitively coupled with one of the first and second electrodes. A correction voltage for correcting distortion of a waveform for driving one of the first and second electrodes is applied to the third electrode, to keep an effective voltage applied to the liquid crystal cells unchanged and improve the display quality of the liquid crystal display. Therefore, the liquid crystal display of the present invention can correct distortion of a common voltage and prevent crosstalk.

Abstract: An active matrix display device having an array of LC picture elements (12), with associated switching means (25), addressed in row sequential fashion via sets of row and column address lines (14, 16) includes in its drive circuit a data signal adjustment circuit (40) which adjusts data signals before application to the column lines (16) so as to compensate for anticipated effects of vertical and lateral forms of cross-talk due to stray capacitive couplings in the picture element array. A correction value for a picture element data signal is derived in the adjustment circuit (40) according to the values of data signals intended over a subsequent field period for other picture elements in the same column and one or both adjacent columns, and the relevant capacitive coupling factors. The display device may be of the type using TFTs, TFDs or a plasma-addressed display device.

Abstract: The present invention improves the drop of a contrast, the occurrence of cross-talk and the drop of a response speed by bringing the drive state of an electrooptical display device to theoretical values. In a display device including a display panel having common electrode groups and segment electrode groups, a common electrode drive circuit and a segment electrode drive circuit, the quantity of the current flowing through the display panel through the segment electrode drive circuit is detected by a current detection circuit consisting of a differential amplifier 101 and a resistor Ra and by a current detection circuit consisting of a differential amplifier 102 and the resistor Ra, and the common electrode drive voltage applied to the common electrode groups through the common electrode drive circuit is controlled by a differential amplifier 103 on the basis of this current detection quantity, whereby the contrast is improve cross-talk is eliminated, and remarkable effects are obtained.

Abstract: A liquid crystal display device (LCD) includes sets of row address conductors (10) and column address conductors (11) which are coupled to liquid crystal pixels (12) arranged in a matrix of rows and columns for displaying images. A drive circuit (20-24) for such a display device generates selection voltages (Vr) to be supplied to one of the sets of address conductors (10, 11), and data voltages (Vk) to be supplied to the other set of address conductors (10, 11), the data voltages (Vk) being related to a received display information signal (VI).

Abstract: The present invention improves the drop of a contrast, the occurrence of cross-talk and the drop of a response speed by bringing the drive state of an electrooptical display device to theoretical values. In a display device including a display panel having common electrode groups and segment electrode groups, a common electrode drive circuit and a segment electrode drive circuit, the quantity of the current flowing through the display panel through the segment electrode drive circuit is detected by a current detection circuit consisting of a differential amplifier 101 and a resistor Ra and by a current detection circuit consisting of a differential amplifier 102 and the resistor Ra, and the common electrode drive voltage applied to the common electrode groups through the common electrode drive circuit is controlled by a differential amplifier 103 on the basis of this current detection quantity, whereby the contrast is improve, cross-talk is eliminated, and remarkable effects are obtained.

Abstract: A common-voltage compensation driving apparatus and method and a crosstalk-compensation driving apparatus of an AMLCD detect current flowing through a common electrode for an optional period to compensate for a common electrode voltage by using the current value as a reference and eliminate crosstalk resulting from the variation of a video data value.

Abstract: An active matrix liquid crystal display device having a row and column array of picture elements which each include a switching device and which are driven by a drive circuit via sets of row and column address conductors to which selection and data signals are applied respectively, includes a data signal adjustment circuit which adjusts a data signal intended for a picture element prior to its application to the column conductor and according to a compensation value derived from the values of data signals intended for other picture elements using the same column conductor in the period until the picture element is next addressed so as to compensate for the subsequent effects of vertical cross-talk due to capacitive coupling effects at the picture element. In determining the compensating adjustment, blanking intervals in an applied video signal and current leakage effects can also be taken into account.

Abstract: A graphics controller drives a flat-panel display and simultaneously drives an external cathode-ray-tube (CRT) display. Horizontal clock pulses continue to be applied to the flat panel during the CRT's vertical blanking or re-trace period so that the flat panel is not left in a constant state during the entire re-trace period. Leaving the flat panel in a constant state for a long period of time can cause flicker or delayed response immediately after the re-trace period ends. Running the horizontal clocks during the re-trace period can lead to D.C. buildup or rolling flicker, believed to be caused by a polarity-inversion counter in the panel assembly which is not designed to receive additional horizontal clocks beyond the number of lines on the flat panel. D.C. buildup in the flat panel is reduced by adding a high-frequency burst of horizontal clock pulses to the flat panel during the CRT's vertical re-trace period. The burst of clock pulses adjusts the count in the polarity-inversion counter.

Abstract: In a method for driving a matrix liquid crystal display (LCD), whereby the selection ratio of a scanning electrode is improved and the voltage magnitude variation is considerably reduced, the scanning electrode driving signals are made to overlap each other according to an orthogonal function to then be sequentially applied to adjacent scanning electrodes. The data electrode driving signals are made to change in their voltage level through the step of maintaining an intermediate voltage level in the overlap interval to then be applied to data electrodes in the alternative, or the scanning electrode driving signals having opposite polarity are periodically applied to adjacent scanning electrodes. Therefore, the selection ratio of scanning electrodes are improved and the generation of the waveform differential is minimized, thereby reducing the crosstalk generated in a picture.

Abstract: A drive method and a drive unit for a liquid crystal display unit which reduce the variation in the effective value of an applied voltage dependent upon the display patterns, are inexpensive, and enhance the display quality are provided. There is provided a segment-side liquid crystal drive circuit 2 which incorporates an output control section 26 where an output correction period is provided in an output of the segment-side liquid crystal drive circuit 2 at intervals of a 1-line scanning period, and during the output correction period a display voltage level of the output is set to an OFF display voltage level when the display voltage level of the output is in an ON display level and to an ON display voltage level when the display voltage level of the output is in an OFF display level.