Sharp Kabushiki Kaisha Corporation

Sakai Display Products Corporation

Kentaroh Irie

Fumikazu Shimoshikiryoh

Masae Kawabata

Toshihide Tsubata

Masae Kitayama

Naoshi Yamada

Mitsuaki Hirata

Hidetoshi Nakagawa

Masanori Takeuchi

Nobuyoshi Nagashima

Ichiro Takada

Hiroaki Nakasu

A liquid crystal display apparatus includes: a liquid crystal display panel having a first substrate, a second substrate, and a vertical alignment type liquid crystal layer; and a control circuit configured to generate a display signal voltage. The first substrate has pixel electrodes to which the display signal voltage is applied, and a first alignment film. The second substrate has a counter electrode to which a common voltage is applied, and a second alignment film. Each pixel has liquid crystal domains having different reference alignment directions defined by the first and second alignment films. The pixel electrode has slits. The control circuit is configured to generate, as the display signal voltage, a voltage obtained by adding a predetermined offset voltage to an original voltage corresponding to a gray level. The offset voltage is substantially the same for gray levels higher than or equal to a predetermined intermediate gray level.

Liquid crystal display apparatus

A liquid crystal display device includes a liquid crystal panel having a plurality of pixels grouped into four types of type, type, type, and type; a panel driver circuit connected to the liquid crystal panel to drive the liquid crystal panel; and a display control circuit connected to the panel driver circuit, wherein said display control circuit divides each refresh cycle of the image signal into consecutive first to fourth terms and causes the panel driver circuit to drive the liquid crystal panel to perform a halftone display by changing pixel luminance during each refresh cycle composed of the first to fourth terms, and wherein said display control circuit provides timing signals and gradation data to the panel driver circuit so that, for a given halftone to be displayed in a refresh cycle, pixels belonging to respective types in the liquid crystal panel are driven such that the halftone is generated as averaged over the first to fourth terms.

Liquid crystal display device, television receiver, and display method for liquid crystal display device

In a liquid crystal display device adopting a time-division scheme to improve viewing angle characteristics, the occurrence of horizontal lines on a screen is suppressed. When first output gray scales are obtained for one-line data, the sum total of differences between 'source voltages for a horizontal scanning period immediately before a horizontal scanning period during which a processing target line is placed in a selected state' and 'source voltages determined based on the first output gray scales obtained by a gray scale value obtaining unit' for all source bus lines is determined (step S). Then, based on the amount of CS ripple corresponding to the sum total determined at step S, correction addition/subtraction values are obtained from a polarity-by-polarity background look-up table, for the respective picture elements included in the processing target line (step S). Then, second output gray scales are determined in an addition/subtraction process of the first output gray scales and the correction addition/subtraction values (step S).

Liquid crystal display device

The present invention provides a liquid crystal display device that appropriately compensates for a feed-through voltage. The liquid crystal display device is arranged such that when data of a certain gray level is to be displayed, the effective value of a pixel voltage changes in an N-frame cycle, a first pixel and a second pixel are provided that are different in the effective value during an i-th frame (1&#x2266;i&#x2266;N), the first pixel has a positive polarity during the i-th frame, whereas the second pixel has a negative polarity during an i{N/2 after}th frame, the first pixel has a polarity during a j-th frame (where 1&#x2266;j&#x2266;N and i&#x2260;j), the polarity being different from the polarity of the second pixel during a j{N/2 after}th frame, and when data of a first gray level is to be displayed, VB and VC are different from each other, where VA is a source voltage (VD) of the first pixel during the i-th frame, VB is a source voltage (VD) of the second pixel during the i{N/2 after}th frame, and VC is, in a case where data of a second gray level is to be displayed when the first pixel has a positive polarity during the j-th frame, a source voltage (VD) of the second pixel during the j{N/2 after}th frame for the case in which the source voltage (VD) of the first pixel during the first pixel is VA.

Liquid crystal display device and method for driving a liquid crystal display device

A liquid crystal display device which carries out a single tone display with a change in pixel luminance during a single cycle composed of first to mth frame periods (m is an integer of 4 or more), includes: pixels of a first type in which when a halftone is displayed, supply of two or more kinds of data voltage during at least either the first to nth frame periods (n is an integer of 2 or more to m or less) or the (n+1)th to mth frame periods causes liquid crystal layers to produce rise responses during the first to nth frame periods and produce decay responses during the (n+1)th to mth frame periods; and pixels of a second type in which when a halftone is displayed, supply of two or more kinds of data voltage during at least either the first to nth frame periods or the (n+1)th to mth frame periods causes liquid crystal layers to produce decay responses during the first to nth frame periods and produce rise responses during the (n+1)th to mth frame periods. This makes it possible to achieve both an improvement in viewing angle characteristic and a reduction in flickers.

LCD device and television receiver

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

Provided is a liquid crystal display device which displays each halftone by changing the luminance of pixels during a cycle (F-F) composed of a first term (F-F), a second term (F-F), a third term (F-F), and a fourth term (F-F). The liquid crystal display device includes: a type 1 pixel, which luminance level rises during the first term, rises or stays on hold during the second term, decays during the third term, and decays or stays on hold during the fourth term; a type 2 pixel, which luminance level decays during the first term, decays or stays on hold during the second term, rises during the third term, and rises or stays on hold during the fourth term; a type 3 pixel, which luminance level rises or stays on hold during the first term, decays during the second term, decays or stays on hold during the third term, and rises during the fourth term; a type 4 pixel, which luminance level decays or stays on hold during the first term, rises during the second term, rises or stays on hold during the third term, and decays during the fourth term to continuously display the same halftone.

Display apparatus, liquid crystal display apparatus, drive method for display apparatus, and television receiver

The present invention provides a display device which is arranged so that when an image is scrolled, a noise pattern does not easily overlap the image. The display device includes a display region that includes a region in which an arrangement pattern (U) including X i-th pixels arranged next to one another in the row direction for each data color, the arrangement pattern being repeated in the row direction, the X being represented by/2+

Display device and method for driving display device

Each picture element includes first and second sub-picture elements, each of which includes a liquid crystal capacitor and at least one storage capacitor. After a display voltage representing a certain grayscale level has been applied to the respective sub-picture element electrodes of the first and second sub-picture elements, a voltage difference &#x394;V&#x3b1; is produced between voltages to be applied to the respective liquid crystal capacitors of the first and second sub-picture elements by way of their associated storage capacitor(s). By setting the voltage difference &#x394;V&#x3b1; value of the blue and/or cyan picture element(s) to be smaller than that of the other color picture elements, shift toward the yellow range at an oblique viewing angle can be minimized.

Liquid crystal display with first and second sub-picture elements including two storage capacitors

A plurality of groups each of which includes a plurality of scanning signal lines are sequentially selected; a polarity of the data signal electric potentials in one (first group) of sequentially-selected groups is set to be different from that of the other (second group) of the two groups; two pieces of dummy scan periods are put between (i) a horizontal scan period corresponding to a last horizontal scan in the first group and (ii) a horizontal scan period corresponding to a first horizontal scan in the second group; dummy signal electric potentials are supplied to the data signal line in the dummy scan periods; and a time period from when a scanning pulse which corresponds to the last horizontal scan in the first group becomes nonactive to when the dummy scan period is started is set to be longer than a time period from when a scanning pulse corresponding to one of consecutive two horizontal scans becomes nonactive in the first group to when a horizontal scan period corresponding to the other of the consecutive two horizontal scans is started. This makes it possible to enhance display quality in a case where the data signal line is subjected to the block-reversal driving.

Liquid crystal display device, method for driving the same, and television receiver

A first sub-pixel area and a second sub-pixel area that are provided in each of pixel areas so as to sandwich a scanning signal line. A first sub-pixel is arranged to include the first sub-pixel area and a section of the counter substrate which section corresponds to the first sub-pixel, area and the second sub-pixel is arranged to include the second sub-pixel area and a section of the counter substrate which section corresponds to the second sub-pixel area. A first alignment control structure is provided in the first sub-pixel and a second alignment control structure is provided in the second sub-pixel. The first alignment control structure (Land Sto S) provided in one pixel () of two adjacent pixels has a shape obtained by rotating by 180&#xb0; the first alignment control structure (L, Sto S) provided in the other one pixel () of the two adjacent pixels. This makes it possible to suppress deterioration in viewing angle characteristics caused by disordered alignment along the scanning signal line () in a liquid crystal panel in which a plurality of alignment domains can be formed.

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Osaka, Japan

Kentaroh Irie