Sharp Kabushiki Kaisha Corporation

Sakai Display Products Corporation

Masae Kitayama

Fumikazu Shimoshikiryoh

Kentaro Irie

Toshihide Tsubata

Naoshi Yamada

Ikumi Itsumi

Mitsuaki Hirata

Yuki Yamashita

Akane Sugisaka

Kenichi Hyohdoh

Kentaroh Irie

Yukio Yoshida

Tsuyoshi Tokuda

Koji Matsuoka

Makoto Shiomi

Hidetoshi Nakagawa

Masanori Takeuchi

Toshinori Sugihara

Akihiro Shoraku

Akihiro Shohraku

Toshikazu Tsuchiya

Nobuyoshi Nagashima

Kenichi Hyodo

Nobuo Okano

A liquid-crystal display apparatus and a method for driving liquid-crystal display apparatus are provided. Pixels arrayed in a form of a matrix are each defined so as to include an electrode pair consisting of a pixel electrode and a counter electrode facing one another via a liquid-crystal layer, and a scan signal is applied, from a scan-signal line for each line, to a control electrode of a TFT for applying a data signal to the pixel electrode included in the pixel. A signal to be raised when the scan signal for each line falls is applied to a signal line arranged between a pixel in each line and a pixel adjacent to the pixel at one side in the line direction.

Liquid crystal display device, and drive method for liquid crystal display device with discharge capacitor connected to signal line

Each of pixels arranged in a matrix has at least first and second subpixels defined to include an electrode pair of a subpixel electrode and a counter electrode facing each other with a liquid crystal layer interposed therebetween. A scanning signal is applied from a scanning signal line of each row of the matrix to a gate electrode of a TFT for applying a data signal from a source signal line to the subpixel electrode included in each of the first and second subpixels. A discharge capacitor electrode is connected to the subpixel electrode of the second subpixel through another TFT. When the signal width of the scanning signal is within a range from M times (M is 0 or 1) the length of 1 H to (M+1) times, a discharge signal line is connected to the scanning signal line, which is scanned after N horizontal scanning periods (N is M+2, that is, 2 or 3), by a signal-to-signal connection line.

Liquid crystal display device

A liquid crystal panel according to an embodiment of the present invention comprises: a liquid crystal layer containing liquid crystal molecules; a first alignment film in contact with a front surface of the liquid crystal layer; and a second alignment film in contact with a rear surface of the liquid crystal layer, the liquid crystal panel being curved in the shape of a cylindrical surface. The first alignment film includes a plurality of first strip portions extending along a first direction and causing the liquid crystal molecules to be aligned. The second alignment film includes a plurality of second strip portions extending along a second direction and causing the liquid crystal molecules to be aligned. The first direction is a peripheral direction of the cylindrical surface. The second direction is a direction which crosses the peripheral direction.

Liquid crystal panel and liquid crystal display apparatus

Pixels P arranged in a matrix shape have at least two sub-pixels defined by including an electrode pair of a sub-pixel electrode and a counter electrode facing each other through a liquid crystal layer. Regarding at least two sub-pixels included in the pixel P, a voltage difference between voltages applied to the liquid crystal layer through the electrode pair, a brightness difference or a luminance difference varies depending on an arrangement position of the pixel P in a row direction and/or column direction.

Liquid crystal display apparatus and method for driving liquid crystal display apparatus

Provided are a liquid crystal display apparatus and a method for driving a liquid crystal display apparatus capable of effectively suppressing the deterioration in gamma characteristics even when an angle between a normal line to a display screen from a position of observation and an observer's line of sight is relatively large. Pixels P, arranged in a matrix, are defined to include a plurality of pairs of electrodes for applying a voltage to a liquid crystal layer. Each of two subpixels included in each pixel P is defined to include a pair of electrodes consisting of a subpixel electrode and a counter electrode. A pair of electrodes in each of the two subpixels included in the pixel P (including a pair of electrodes in a third subpixel which may also be included in the pixel P) applies a voltage to the crystal liquid layer. A voltage difference between any two voltages applied to the crystal liquid layer is set to vary in accordance with the arrangement position of the pixel P along the rows and/or columns of the matrix.

Liquid crystal display apparatus and method of driving liquid crystal display apparatus

A color display pixel Pin a liquid crystal display device () includes first through fourth pixels Pthrough Parrayed in two rows by two columns, and first and second signal lines () which are located in correspondence with each column of pixels and are supplied with signal voltages of polarities opposite to each other from a signal line driving circuit () in each vertical scanning period. A TFT () of one of the first and third pixel Pand Pis connected to the first signal line (), and a TFT () of the other pixel is connected to the second signal line (). A TFT () of one of the second and fourth pixel Pand Pis connected to the first signal line (), and a TFT () of the other pixel is connected to the second signal line (). The TFTs () of the first through fourth pixels Pthrough Pare controlled to be ON/OFF by a common scanning signal, and the polarities of the signal voltages supplied to the first and second signal lines () are constant during an arbitrary vertical scanning period. Owing to this, the load on the signal line driving circuit is reduced.

The present invention relates to a liquid crystal display device that can prevent shadowing, and a method for driving the device. The device comprises a plurality of switching elements. Display pixels connected to the switching elements are connected in a matrix form. Two data signal lines for writing data signals are respectively provided to display pixels in each column.

Liquid crystal display device and method for driving the liquid crystal display device whereby shadowing can be prevented

In one embodiment of the present invention, each pixel includes first and second subpixels. CS bus lines connected to the respective storage capacitors of the first and second subpixels are electrically independent of each other. A CS voltage has a waveform that inverts its polarity at least once a frame, which includes a first subframe for sequentially scanning a series of odd rows and a second SF for sequentially scanning even rows that have been skipped during the first SF. A source signal voltage varies so as to have two frames or subframes with mutually opposite polarities. A CS voltage has a waveform that has quite opposite consequences on the effective voltage of a subpixel of a pixel connected to the jscan line to be selected during the first subframe and on that of another subpixel of a pixel connected to the (j+1)scan line to be selected during the second subframe. In this manner, the deterioration in display quality, which would be caused if either a source line inversion drive or a block inversion drive is applied to a multi-pixel technology, can be minimized.

Liquid crystal display

In at least one embodiment a ripple, generated in an electric potential of data signal lines even in long-term reversal driving, is reduced and display quality is improved. In at least one example embodiment, the liquid crystal display apparatus of the present invention includes scanning signal lines and data signal lines, in which one scanning pulse is outputted to select one scanning signal line, each of the data signal lines receives data signals whose polarities are reversed per one vertical scanning period while in one horizontal scanning period, one of two data signal lines receives a data signal having a polarity and the other of the two data signal lines receives another data signal having another polarity, the two data signal lines being arranged adjacent to each other, scanning pulses are successively outputted in sets of two, and at a timing in which two scanning pulses fall, two scanning pulses rise.

Methods for reducing ripples in data signal lines, display apparatus, liquid crystal display apparatus, and television receivers including the same

A liquid crystal display device (A) according to the present invention includes a plurality of pixels () which are arranged in columns and rows to form a matrix pattern. Each of the plurality of pixels () includes first and second subpixels (), which are arranged in a column direction, one of which is a bright subpixel that exhibits a higher luminance than the other at least at a particular grayscale, and the other of which is a dark subpixel. The plurality of pixels define a plurality of color display pixels, each of which includes an even number of pixels including first, second, third and fourth pixels (Y, R, G, B) that are arranged in a row direction. In an arbitrary row of pixels, a row of subpixels including the bright subpixels includes the respective bright subpixels of all of the first, second, third and fourth pixels.

A display device includes first and second display pixels connected to a first source line, third and fourth display pixels connected to the second source line. The device further includes a receiver receiving display voltage for each display pixel, a calculator calculating first difference voltage between the display voltages of the first and second display pixels, and calculating a second difference voltage between the display voltages of the third and fourth display pixels. A parasitic capacitance is generated between the first display pixel and each source line and between the third display pixel and each source line. The display device further includes a generator correcting the first display voltage based on the first and second difference voltages and generating first write voltage for the first display pixel, and correcting the third display voltage based on the second difference voltage and generating third write voltage for the third display pixel.

Method of driving display device, program, and display device

The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the pixel areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors. The liquid crystal display device of the present invention is featured in that one of the pair of substrates includes scanning lines, signal lines, and storage capacitor lines, a thin film transistor connected to each of the scanning line and the signal line, and a pixel electrode connected to the thin film transistor, in that the other of the pair of substrates includes an opposed electrode, in that the pixel electrode is arranged for each of the picture elements, and in that the pixel electrode having a larger area among the plurality of pixel electrodes arranged in one pixel is connected to the thin film transistor having a larger channel width among the plurality of the thin film transistors arranged in the one pixel.

A liquid crystal display device () according to the present invention has a plurality of pixels that are arranged in columns and rows to form a matrix pattern and one color display pixel (P) is comprised of four or any other larger even number of pixels. The liquid crystal display device () of the present invention includes a plurality of source bus lines () which run in a column direction. The even number of pixels that form one color display pixel (P) include larger pixels with a relatively large area and smaller pixels with a relatively small area. Each set of pixels to be supplied with a signal voltage from an associated one of the plurality of source bus lines () has substantially the same total area as any other set of pixels. According to the present invention, in a liquid crystal display device in which a plurality of pixels that forms one color display pixel includes the larger and smaller pixels, generation of display unevenness that runs in the column direction can be minimized.

A liquid crystal display device of the present invention has a vertical scanning period in which the polarity of a display signal is positive and a vertical scanning period in which the polarity of a display signal is negative. When a pair of successive two vertical scanning periods is constituted by a first vertical scanning period and a second vertical scanning period, and when a target gradation level to be displayed in the first vertical scanning period is GL, and a target gradation level to be displayed in the second vertical scanning period immediately after the first vertical scanning period is GL, GLand GLbeing integers of 0 or more representing gradation levels, the liquid crystal display device includes a circuit () capable of supplying a display voltage corresponding to a gradation level to a pixel in the second vertical scanning period, the gradation level being expressed by GLwhich satisfies a condition where |GL-GL| is larger than |GL-GL|, in the case where GLis different from GL. The value of GLwhen the polarity in the first vertical scanning period is positive and the polarity in the second vertical scanning period is negative is different from the value of GLwhen the polarity in the first vertical scanning period is negative and the polarity in the second vertical scanning period is positive.

Liquid-crystal display device

An active matrix type liquid crystal display device may include a black signal insertion device to apply a voltage corresponding to a black display as a voltage for data signal lines only during a black signal insertion period that is a part of one frame period, a black insertion ratio change device to change the insertion period, and an unchanged-storage-capacitor-phase-keeping device to control the insertion period after the change. The control makes a time difference the same, before and after the change, between (i) a timing, among timings at which signal voltages of the first or second storage capacitor line rise, at which a storage capacitor voltage rises that is both prior to a start timing of the insertion period and a closest timing to the start timing of the insertion period, and (ii) the start timing of the insertion period.

Growing community of inventors

Osaka, Japan

Masae Kitayama