Abstract: This invention relates to a three electrode liquid crystal display panel that is adaptive for AC-driving liquid crystal cells inclusive of three electrodes, and a driving method thereof. A three electrode liquid crystal display panel according to an embodiment of the present invention includes first and second pixel electrodes disposed on a first substrate with an insulating film therebetween; and a common electrode disposed in a second substrate which is bonded with the first substrate with a liquid crystal therebetween, and wherein the first pixel electrode selectively supplies a maximum voltage and a minimum voltage, the common electrode supplies a medium voltage between the maximum voltage and the minimum voltage as a reference voltage, and the second pixel electrode supplies a positive data voltage and a negative data voltage on the basis of the reference voltage in a range between the maximum voltage and the minimum voltage, thereby AC-driving the liquid crystal.

Abstract: A driving apparatus, and a driving method for an electron emission display, includes a controller for comparing external video data input signals, switching a polarity control signal in a predetermined period on the basis of the comparison and controlling a video data output signal in accordance with the polarity control signal, and a data driver for modulating the video data signal output from the controller. The switching of the polarity control signal may be shifted temporally when the comparison indicates the video data input signals have the same gray level.

Abstract: A liquid crystal drive device (200) is configured so that a source driver (20) or a common driver (30) performs voltage application using a power voltage VDDH prior to voltage application using a boosted voltage 2VDDH upon application of a source voltage VS and high-level transition of a common voltage VCOM.

Abstract: A display having a passive matrix display element and capable of supporting full-color display includes a passive matrix display element 10 composed of a memory display material, a row driver 26 for driving the scan electrode of the display element and a column driver 27 for driving the data electrode of the display element and further includes an output circuit for outputting only one set of control signals composed of a pulse signal XCLK indicating a clock for retrieving data, a pulse signal LP indicating a latch pulse for data confirmation and a frame signal FR indicating a pulse polarity control signal which are shared by the three primary colors. The output timing of three display driving signals supporting full-color display is set at time intervals indicated by a predetermined setting value. The time intervals can be determined with reference to the temperature-operating time characteristic of a nematic liquid crystal.

Abstract: Novel three-color and four-color subpixel arrangements and architectures for display and the like are herein disclosed. Novel techniques for subpixel rendering on the above subpixel arrangements are also herein disclosed.

Abstract: A driving circuit according to an embodiment of the invention includes: a switching unit for sequentially switching between a first operation of applying a positive gray-scale voltage to odd-numbered data lines and applying a negative gray-scale voltage to even-numbered data lines and a second operation of applying a negative gray-scale voltage to odd-numbered data lines and applying a positive gray-scale voltage to the even-numbered data lines; a plurality of short-circuit switches for short-circuiting a pair of adjacent odd-numbered data lines and a pair of adjacent even-numbered data lines to produce a plurality of pairs of short-circuited data lines in a switching period between the first operation and the second operation; and a plurality of common node-connected switches corresponding to the plurality of data line pairs and short-circuiting a corresponding one of the data line pairs to a common node.

Abstract: In a display apparatus of a hold type represented by a TFT liquid crystal display, blurring of dynamic picture when the dynamic picture is displayed is improved. One frame is divided into dark fields and light fields. A dark brightness gradation voltage approaching to display of black as near as possible is generated in the dark fields and a light brightness gradation voltage for compensating the brightness reduced by the dark fields is generated in the light fields. At this time, low gradation voltages (V0P to V20P) or high gradation voltages (V43P to V63P) in the dark or light brightness gradation voltages are set to the same potential.

Abstract: A liquid crystal display apparatus includes a liquid crystal panel having a matrix of pixels, a control circuit, and a temperature sensor. The temperature sensor directly or indirectly detects a temperature of the liquid crystal panel. The control circuit reverses a polarity of a voltage applied to each pixel at a time interval variable with the detected temperature, while keeping a field frequency constant. The time interval is a positive integer multiple of the reciprocal of a field frequency, i.e., a positive integer multiple of a field period. When the temperature of the liquid crystal layer is low, the control circuit reverses the polarity of the voltage at a longer time interval. In contrast, when the temperature of the liquid crystal layer is high, the control circuit reverses the polarity of the voltage at a shorter time interval.

Abstract: A display driver which drives a data line connected to a pixel electrode through a switching element, the pixel electrode facing a common electrode with an electro-optical substance interposed, and a voltage being supplied to the common electrode based on a polarity reversal signal. The display driver includes: a polarity reversal signal generation circuit which generates the polarity reversal signal which specifies the timing at which the polarity of a voltage applied to the electro-optical substance is reversed; and a driver section which supplies a drive voltage based on display data to the data line so that the polarity of the voltage applied to the electro-optical substance is reversed in synchronization with the polarity reversal signal.

Abstract: A liquid crystal display which may suppress image quality deterioration and enhance image contrast is provided. The liquid crystal display includes: a light source unit including a light source having divided lighting sections and a light source control section; a liquid crystal display panel including pixels and modulating light from the light source; and a display driving section performing a polarity inversion driving based on the inputted video signal. The display driving section corrects the inputted video signal, for each of divided display regions in the liquid crystal display panel corresponding to ON-state divided lighting sections, based on a light control signal from the light source control section, so that a amplitude center potential of the driving voltage with a waveform of alternately-inverting polarity substantially agrees with the common potential. The driving voltage based on a corrected video signal is then applied to the liquid crystal element.

Abstract: A driving method of a pixel array is provided. The driving method is suitable for a pixel array comprising at least one pixel set in each pixel array, wherein at least one pixel set comprises a plurality of pixels. In the driving method, a voltage having substantially same phase is used to drive the pixel electrodes of the pixels in the same pixel set. In addition, voltages with phases substantially opposite to each other are used to drive the pixel electrodes of the pixels in two adjacent pixel sets. Furthermore, a single gate line is used to drive two adjacent pixels in two different pixel sets respectively. In addition, a single gate line is used to drive a first pixel in one of the pixel set and another pixel in an adjacent column of the first pixel, wherein a phase of the voltage of a pixel electrode of the first pixel and a phase of a voltage of a pixel electrode of the other pixel are substantially different.

Abstract: A driving apparatus of a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display panel having a liquid crystal cell of a matrix shape to display a video signal; N (where N is a positive integer) number of data drive circuits that generate a polarity pattern of the video signal and supply it to the liquid crystal cell through a plurality of output channels; and a polarity controller that controls the polarity signal and supplies it to the N number of the data drive circuits on the basis of a first selection signal corresponding to the number of the output channels and a second selection signal corresponding to a repetition period of the polarity pattern.

Abstract: A display driving apparatus and a multi-line inversion driving method thereof are provided. The apparatus includes a gate driver, a source driver, a gate enabling unit and a line polarity signal unit. Every time after a plurality of scan lines is turned on, the source driver inverts the polarity of the sub pixel driving signal according to a line polarity signal output by the line polarity signal unit. Thereby, the polarity inversion operating frequency of the sub pixel driving signal is lowered to reduce the power consumption of the source driver.

Abstract: In a first aspect, a wafer loading station adapted to exchange wafer carriers with a wafer carrier transport system comprises a biasing element adapted to urge the end effector of the wafer loading station away from a moveable conveyor of the wafer carrier transport system upon the occurrence of a unscheduled event such as a power failure or an emergency shutdown. In a second aspect, an uninterruptible power supply commands a controller to cause the wafer carrier handler to retract the end effector from the wafer carrier transport system upon the occurrence of the unscheduled event, and provides the power necessary for the same. Numerous other aspects are provided.

Abstract: A driving unit for a LCD device, including: a ramp signal generating unit for dividing a ramp signal into a first ramp signal and a second ramp signal; an input register unit for sequentially storing N-bit image data; a counter unit for outputting control signals by receiving bits of image data except for the most significant bit and counting based upon the received bits; a ramp signal selecting unit for selecting the first ramp signal or the second ramp signal according to the most significant bit and outputting the selected ramp signal upon receiving the most significant bit from the input register unit; and a switching unit for sampling the first ramp signal or the second ramp signal provided from the ramp signal selecting unit by the control signals of the counter unit and outputting the sampled ramp signal to data lines.

Abstract: Two display panels constituted at least by having a plurality of scanning lines and signal lines with display pixels situated near each intersecting point of each scanning line and signal line besides a common electrode situated in common with each of the display pixels and the display panels having a predetermined numbers of the scanning lines respectively. While repeating alternately between each of the display panels in a display period within a one frame period, an operation sequentially selects a number of the scanning lines of each of these display panels corresponding to the ratio of the numbers of the scanning lines in each of these display panels at predetermined scan timing. Reversal control of the signal polarity of each common signal voltage is applied to the common electrode of each display panel so that reversal drive of each display panel is performed for every scanning line and frame period.

Abstract: A liquid crystal display has pixel electrodes, a common electrode, a liquid crystal layer provided between the pixel electrodes and the common electrode, and a back light that supplies light transmitting through the liquid crystal layer, further has a control circuit that applies a drive voltage corresponding to image data between the pixel electrodes and the common electrode such that the polarity of the drive voltage is inverted for each predetermined period. Within a frame period, the control circuit applies a drive voltage of a first polarity in a first period, applies a drive voltage of a second polarity opposite to the first polarity, which is the same voltage as the drive voltage of the first polarity, in a second period after the first period, and controls such that the back light is turned off in the first period and turned on in the second period.

Abstract: This invention relates to a method for driving a display panel (DP) having pixels (P). The display panel (DP) is driven with a sequence of image frames. The image frames are converted to a drive signal (V2) comprising refresh frames with a refresh frame period (TR) shorter than the image frame period. A pixel (P) of the display panel (DP) is driven with an adapted drive signal having a first polarity during a first group of refresh frame periods, and having a reversed polarity during a subsequent second group of refresh frame periods. The first group and the second group each comprise at least two refresh frame periods.

Abstract: The present invention provides a liquid crystal display including: a plurality of pixels each including one or more liquid crystal elements and one or more first TFT elements; a driving section performing polarity inversion driving by applying driving voltages based on an image signal to the liquid crystal element in each pixel while the driving voltages are inversely polarized; and second TFT elements controlled by the driving section. The first TFT element allows the driving voltage to be applied to the liquid crystal element in its own pixel in accordance with control by the driving section. Each of the second TFT elements allows a couple of liquid crystal elements to be electrically connected to each other. The couple of liquid crystal elements are applied with a couple of driving voltages, respectively, within a same frame period. The couple of driving voltages have inversed polarizations with each other.

Abstract: A liquid crystal display (LCD) device may include a scan line that is parallel and adjacent to a compensation signal line. A compensation signal transmitted on the compensation signal line may be the inverse of a scan signal transmitted on a scan line. Consequently, feed-through voltage may be reduced and gray levels may be more properly displayed in pixels.

Abstract: A driving scheme for a multiple-fold gate liquid crystal display (LCD), such as a double gate LCD, is disclosed. A forward driving sequence is provided to drive bank A and bank B of pixel electrodes in a number of rows. Subsequently, a reverse driving sequence is obtained to drive the bank A and the bank B in a number of neighboring rows.

Abstract: An output circuit whose outputting signals having large voltage swing by using switches with low voltage tolerance is provided. The output circuit includes: operation amplifiers, receiving positive input voltage and negative input voltages, respectively; transmission gates, passing output signals from the operation amplifiers, respectively; switch transistors, passing output signals from the transmission gates as an output signal of the output circuit, pulling up the output signal from one of the transmission gates, and pulling down the output signal from the other of the transmission gates.

Abstract: A liquid crystal display apparatus includes common voltage generator circuit (5) for supplying a common voltage to a common electrode connected in common to a plurality of liquid crystal cells which form part of liquid crystal panel (9); liquid crystal driving circuit (2) for inversely driving liquid crystal panel (9); timer (8) for measuring a time for which liquid crystal panel 9 has been used; storage unit (10) for storing characteristic data which represents the relationship between used hours of liquid crystal panel (9) and an optimal value for the common voltage; and control unit (4) for determining a time for which liquid crystal panel (9) has been used up to the present time based on a measurement result by timer (8), retrieving an optimal value for the common voltage for the determined used time with reference to the characteristic data stored in storage unit (10), and controlling such that a magnitude of the common voltage output from the common voltage generator circuit is equal to the optimal valu

Abstract: The first output buffer 22 of the driving LSI 20 outputs the first video signal voltage V and the second output buffer outputs the second video signal voltage *V with the opposite polarity from that of the first video signal voltage. The first and the second video signal voltages V, *V are fed to the drain driver 2 of the display panel 1 through a pair of signal wirings. The drain driver 2 supplies the first video signal voltage V to a pixel and the second video signal voltage with the opposite polarity to the pixel adjacent to the fist pixel through the drain line 5 and the TFT9. In this way, any pair of the adjacent pixels in horizontal and vertical direction receives the video signal voltages with opposite polarities from each other.

Abstract: An active matrix display apparatus includes an active matrix display panel comprising a plurality of pixels arranged in a matrix in a row direction and a column direction, each pixel being constituted by a plurality of subpixels; and a drive circuit for applying a voltage to each of the subpixels so that a polarity of the voltage is inverted at a predetermined period in each of a row direction and a column direction. The plurality of subpixels are arranged in the row direction at a period different from half of the predetermined period of polarity inversion of the voltage in the row direction, thus providing flicker-less color display device even when general driver ICs for dot inversion drive are used.

Abstract: A liquid crystal display (LCD) device with a driving method includes an LCD panel, a data driving circuit, a common voltage generating circuit, and a gate driving circuit. The LCD panel includes multiple data lines and multiple scanning lines intersecting with the data lines, and a common electrode. The gate driving circuit provides multiple gate-scanning signals to scan the scanning lines. The common voltage generating circuit provides a common voltage to the common electrode. The data driving circuit provides a gray level voltage signal including multiple voltage levels to the data lines. The common voltage is serial square waves having at least two non-identical frame periods. The square waves in each non-identical frame period of the common voltage in one frame have a constant period.

Abstract: Driving schemes are described in which rows (1 to m) are selected one at a time and column data voltages are inverted to provide inversion schemes for display devices comprising pixels (12) arranged in rows (1 to m) and columns (1 to n). The order in which rows are selected is such that a first group of first polarity rows is selected in a first order, a first group of second polarity rows is selected in a second order, a second group of first polarity rows is selected in the second order, and a second group of second polarity rows is selected in the first order, the first order being one of ascending or descending row number order, and the second order being the other of ascending or descending row number order.

Abstract: A semiconductor display device with which flicker, vertical striping, and horizontal striping are not easily seen, and a method of driving the semiconductor display device, are provided. Display signals inputted to a plurality of pixel electrodes have a positive or negative polarity based on the electric potential of an opposing electrode, and pixel electrodes to which display signals having a positive polarity are inputted, and pixel electrodes to which display signals having a negative polarity are inputted, differ for each frame period with the method of driving the semiconductor display device.

Abstract: A liquid crystal display and a method of driving the same are disclosed. The liquid crystal display includes a timing signal multiplying circuit multiplying a frequency of a timing signal, a timing control signal generating circuit generating a polarity control signal based on the multiplied timing signal, a polarity control signal inverting circuit that inverts the polarity control signal in response to an inverse periodic signal, that is inverted every constant time interval, to generate an inverse polarity control signal, and a data drive circuit that respectively converts digital video data and digital black data into a video data voltage and a black gray level voltage, inverts polarities of the video data voltage and the black gray level voltage in response to the inverse polarity control signal, and supplies the video data voltage and the black gray level voltage to data lines.

Abstract: A drive circuit of a liquid crystal display device performs line inversion drive based on a correction video signal V. A look-up table (12) includes two types of tables having stored therein correction values for use in overshoot drive. Based on a current-frame video signal X, a previous-frame video signal Y stored in a frame memory (11), and a polarity-reversing signal REV, a correction process portion (13) reads a correction value from the look-up table (12), and outputs the correction value being read as the correction video signal V. In such a manner, a correcting circuit (10) is used to control the degree of overshoot in accordance with the polarity-reversing signal REV. Thus, it is possible to suitably control the change in pixel brightness regardless of the polarity of the applied voltage, thereby preventing any fringes from being generated while displaying moving images.

Abstract: A driving circuit includes a scanning-line driving circuit applying an on potential to sequentially drive scanning-lines, a data-line driving circuit that, when the on potential is applied to each scanning-line, turns each data-line potential to a potential difference corresponding to a density based on a counter electrode potential and a potential corresponding to the same writing polarity among the scanning-lines, and a storage capacitor driving circuit which, when the on potential is applied to the scanning-lines and the data-line potential corresponds to positive polarity writing, shifts the other storage capacitor electrode potential in each storage capacitor to a high level after an off potential is applied to the scanning-lines, and, when the on potential is applied to the scanning-lines and the data-line potential corresponds to negative polarity writing, shifts the other storage capacitor electrode potential to a low level after the off potential is applied to the scanning-lines.

Abstract: A liquid crystal display includes a gate driver, a data driver and a pixel matrix. The gate driver is for outputting a plurality of gate signals successively. The data driver is for providing a plurality of data signals. The pixel matrix includes a number of pixels. Each pixel includes a first sub-pixel, a second sub-pixel and a voltage coupling device. The voltage coupling device is coupled between the first sub-pixel and the second sub-pixel such that pixel voltages of the first sub-pixel and the second sub-pixel are different and have relevant variation.

Abstract: A timing controller, an LCD, and a method for driving the LCD are provided. The LCD comprises an LCD panel having a plurality of gate lines and source lines, a data driver, and a scanning driver. The scanning driver supplies a m-pulse scanning signal to each of the gate lines of the LCD panel, wherein m is an integer equal to or larger than 2. The second pulse of the m-pulse scanning signal supplied to the n-th gate line is in synchronization with the first pulse of the m-pulse scanning signal supplied to the (n+1)-th gate line, wherein n is an integer equal to or larger than 1.

Abstract: A combination of a bright and dark display pattern and a polarity pattern is used to drive a liquid crystal display device. In the bright and dark display pattern, bright display picture elements and dark display picture elements alternate with each other every one picture element in horizontal and vertical directions. In the polarity pattern, positive-polarity picture elements and negative-polarity picture elements alternate with each other every two picture elements in the horizontal and vertical directions.

Abstract: An inversion method for use in a liquid crystal display having pluralities of pixels. First, at least one inversion signal is provided to determine a polarity. A data voltage is then generated according to the polarity and a data signal. Thereafter, a scan signal is provided to activate a pixel, such that the data voltage is converted to luminance. The inversion signal is a non-periodic signal. When the scan signal activates the pixel, the inversion signal provides the random alternative of a first level and a second level.

Abstract: A display device is provided including a plurality of pixels, a gate driver applying gate signals to the pixels, a data driver applying data voltages to the pixels, and a signal controller outputting a plurality of control signals for controlling the gate driver and the data driver. The polarity of a data voltage applied to a predetermined pixel is changed at least every two frames.

Abstract: The present invention discloses a driving method for a liquid crystal display. The liquid crystal display has a plurality of pixels arranged in a matrix form. The method includes the following steps. The first step is to write black data to the pixels using an over driving voltage. The second step is to select partial of the pixels or all pixels to write color data based on a color image signal. The third step is to turn on the corresponding backlight based on the color data.

Abstract: A liquid crystal display device and a method of driving the same are provided. The liquid crystal display device includes a first coupling capacitor and a second coupling capacitor, which are coupled to corresponding data lines among a plurality of data lines and are coupled to a first auxiliary data line and a second auxiliary data line, respectively. Using a plurality of the first and second coupling capacitors, the liquid crystal display device can be driven by a dot inversion driving method with reduced power consumption as a result of using a low data signal voltage.

Abstract: A display apparatus and a method for displaying an image are provided. The display apparatus includes a pixel array, a polarity (POL) signal generator, and a drive circuit. The pixel array which includes a plurality of pixels is configured to display a plurality of frames of the image. The POL signal generator is configured to generate a plurality of POL signals. The drive circuit is configured to adjust the frames of the image according to the POL signals, and output the frames to the pixel array.

Abstract: A liquid crystal display (LCD) panel with power consumption reduction and methods of driving same. In one embodiment, the LCD panel includes a pixel matrix, a plurality of scanning lines and a plurality of data lines. Each pair of two neighboring scanning lines defines a pixel row therebetween, and each pair of two neighboring data lines defines a pixel column therebetween. Each pixel has at least a first sub-pixel and a second sub-pixel. Each sub-pixel has a sub-pixel electrode and a switching element electrically coupled to the sub-pixel electrode. Each pair of two neighboring scanning lines is electrically coupled to the switching elements of the first sub-pixel and the second sub-pixel of each pixel in the pixel row, respectively.

Abstract: A liquid crystal display device which includes a first substrate, a second substrate, a liquid crystal composition sandwiched between the first substrate and the second substrate, and a plurality of pixels disposed on the first substrate. Each of the plurality of pixels is supplied with a video signal via a switching element. Each of the plurality of pixels is provided with a capacitance having two electrodes in which one is connected to a first electrode of a corresponding one of the plurality of pixels and another is supplied with a pixel-potential control signal by a pixel-potential control circuit. The pixel-potential control circuit enables selection of a first voltage level and a second voltage level.

Abstract: System and method for driving an LCD using a data-dependent, logic-level drive scheme. A preferred embodiment comprises determining a desired state of each pixel in an LCD pixel segment, deriving a drive waveform based upon the state of all pixels in the LCD pixel segment, and outputting the drive waveform to the LCD pixel segment. By using the states of all the pixels in the LCD pixel segment in the determination of the drive waveform, it is possible to increase the on and off voltage to help improve display quality.

Abstract: A signal-line driving circuit configured to supply a signal voltage having the positive or negative polarity to each of signal lines connected to display cells arranged to form a matrix as cells each to be subjected to a polarity inversion driving operation according to inversion of the polarity of the signal voltage, the signal-line driving circuit including an output buffer section, wherein the output buffer section employs a positive-polarity operating amplifier, a negative-polarity operating amplifier, a first output buffer, a second output buffer, and a switch group.

Abstract: A display device includes a plurality of gate lines, at least one data line, and a plurality of pixels connected to the plurality of gate lines and the at least one data line. The display device is configured to perform a first step of sequentially selecting N lines of the plurality of gate lines, and sequentially outputting N times display signals to the data line, and to perform a second step of selecting Z lines of the plurality of gate lines at one time, and outputting one time a blanking signal, where N and Z are natural numbers at least equal to 2. The Z lines are separate from the N lines, and the first step and the second step are repeatedly performed.

Abstract: A liquid crystal display is driven at, for example, a frame frequency of 100 Hz or higher. There are provided a base-4 frame counter 2 and a source control signal generator section controlling the polarity of the liquid crystal in pixels so as to alternately repeat, for each frame, a horizontal reversal once every m lines (m is 2 or a greater positive integer) and a horizontal reversal once every m lines after shifting the polarity of the lines in the preceding frame by n lines (n is a positive integer equal to a half or less of m). The provision achieves a liquid crystal display and a method of driving the display, addresses insufficient charging at higher frame frequencies and accomplishing higher display quality.

Abstract: It is possible to realize a driver circuit which exhibits low power consumption and high image quality in a liquid crystal display device used in miniaturized portable equipment. In a liquid crystal display device which includes a liquid crystal display element and a liquid crystal driver circuit, the liquid crystal driver circuit is mounted on one side of a liquid crystal display panel. The liquid crystal driver circuit can output counter electrode voltages of two systems and hence, the liquid crystal driver circuit can select a first mode in which the first counter voltage and the second counter voltage have the opposite polarities from each other and a second mode in which the first counter voltage and the second counter voltage have the same polarity. Due to such constitution, while driving the liquid crystal display device in the first mode, the second mode is selected depending on a video signal thus realizing power saving.

Abstract: A liquid crystal display device dividing a single frame of an image signal into m fields and driving the signal at m times speed, including (a) a circuit comparing a concerned frame's image signal with that of an immediately preceding frame for each pixel in the first field, and performing correction so the gradation becomes higher or lower than the concerned frame's image signal with an increase or decrease in the gradation, respectively, (b) a circuit generating an inversion pattern for cyclically inverting polarity of a drive voltage applied to a liquid crystal in m/2 fields including the first field, and (c) a circuit making the drive voltage applied to the liquid crystal in m/2 fields including the first field and the drive voltage applied to the liquid crystal in remaining m/2 fields opposite in polarity to each other on the basis of the pattern.

Abstract: A MVA type liquid crystal panel is slow in a response speed when a black state at a drive voltage about 1V is switched to a low brightness halftone state at the drive voltage about 2 to 3V. According to the present invention, in a liquid crystal display device for driving the MVA type liquid crystal panel, when a liquid crystal pixel at a pixel electrode is changed from a first transmittance to a second transmittance greater than the first transmittance, a drive voltage greater than a fist target drive voltage in correspondence with a second transmittance is applied to the pixel electrode in a first frame period of changing to the second transmittance, and the first target display voltage is applied from a second frame period.

Abstract: An auxiliary capacitance electrode driving circuit outputs an auxiliary capacitance electrode driving signal alternating between high potential and low potential once every horizontal scanning period. A common electrode driving circuit drives a common electrode such that it also alternates between high potential and low potential once every horizontal scanning period. In an auxiliary capacitance potential setting circuit, the anode of a diode is connected to an auxiliary capacitance electrode driving signal line and the cathode of the diode is connected to a ground conductor. A node between the anode of the diode and the auxiliary capacitance electrode driving signal line is connected via a capacitor to the auxiliary capacitance electrode driving circuit. Thus, the auxiliary capacitance potential setting circuit functions as a clamping circuit for setting an upper limit of the potential of the auxiliary capacitance electrode.

Abstract: A liquid crystal display device is formed by arranging a plurality of scanning lines 31, 32, . . . to which scanning signals are successively applied and a plurality of signal lines 41, 42, . . . to which data signals are successively applied to intersect at right angles. Mounted in the vicinity of each of the intersections of the scanning lines 31, 32, . . . and signals lines 41, 42, . . . are a TFT 5 electrically connected to both of the lines, and a pixel electrode 6 connected to the TFT 5. A common electrode is placed to face the pixel electrode 6 with liquid crystals 2 therebetween. One of electrodes of a pixel capacitance formed by the pixel electrode 6 is connected to a common line 9 for supplying a common signal to the common electrode 7. A dummy scanning line 30 for forming a capacitance is arranged outside of the scanning line 31 located at the outermost position on a scanning start side of scanning signal.