# US 11,443,707 B2 · Liquid crystal display device, method for driving liquid crystal display device, and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,707 B2 - Document ID: US11443707B2 - Status: Granted - Kind: B2 - Application number: 16/959,483 - Filed: 2018-12-05 - Published: 2021-10-07 - Granted: 2022-09-13 - Earliest claimed: 2018-01-12 - Assignees: Sony Semiconductor Solutions Corporation - Applicants: Sony Semiconductor Solutions Corporation - Inventors: Hiroshi Kobayashi - Web page: https://patentgrep.com/patent/US11443707B2 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3688: {suitable for active matrices only} - G09G 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages - G09G 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels - G09G 2320/0238: Improving the black level - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A liquid crystal display device includes: a pixel array unit in which pixels including a liquid crystal cell are arranged in a matrix; scan lines; common wiring; and data lines, in which each of the pixels includes a pixel transistor connecting the data line and the pixel electrode, a conductive state/a non-conductive state of the pixel transistor is controlled by a scan signal voltage applied to the scan line, a signal voltage whose polarity is inverted in regular cycles is supplied to the common wiring, and at least one of a pre-charge voltage supplied to the data line prior to writing of a video signal voltage or a scan signal voltage supplied to the scan line when no pixel is selected is supplied so as to vary in accordance with the position at which the pixels are selected row by row in the pixel array unit. ## Claims ### Claim 1 A liquid crystal display device, comprising: a pixel array unit in which pixels including a liquid crystal cell are arranged in a matrix; a plurality of scan lines that selects the pixels row by row, the plurality of scan lines extending along a row direction; common wiring that supplies a voltage to a counter electrode in the liquid crystal cell; and a plurality of data lines that supplies a voltage to a pixel electrode in the liquid crystal cell, the plurality of data lines extending along a column direction, wherein each of the pixels includes a pixel transistor connecting a data line in the plurality of data lines and the pixel electrode, and a conductive state/a non-conductive state of the pixel transistor is controlled by a scan signal voltage applied to a scan line of the plurality of scan lines, wherein a signal voltage whose polarity is inverted in regular cycles is supplied to the common wiring, and wherein a scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary between a positive voltage value and a negative voltage value, with the positive voltage value being at least twice that of the negative voltage value, in accordance with a position at which the pixels are selected row by row in the pixel array unit. ### Claim 2 (depends on 1) The liquid crystal display device according to claim 1, wherein the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary in accordance with the position at which the pixels are selected row by row. ### Claim 3 (depends on 1) The liquid crystal display device according to claim 1, wherein a plurality of groups including a plurality of adjacent pixel rows is formed in the pixel array unit, and the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary in accordance with a group of the plurality of groups in which the pixels selected row by row are located. ### Claim 4 A method for driving a liquid crystal display device comprising: a pixel array unit in which pixels including a liquid crystal cell are arranged in a matrix; a plurality of scan lines that selects the pixels row by row, the plurality of scan lines extending along a row direction; common wiring that supplies a voltage to a counter electrode in the liquid crystal cell; and a plurality of data lines that supplies a voltage to a pixel electrode in the liquid crystal cell, the plurality of data lines extending along a column direction, wherein each of the pixels includes a pixel transistor connecting a data line in the plurality of data lines and the pixel electrode, and wherein a conductive state/a non-conductive state of the pixel transistor is controlled by a scan signal voltage applied to a scan line of the plurality of scan lines, the method comprises: supplying a signal voltage whose polarity is inverted in regular cycles to the common wiring; and supplying a scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected such that the scan signal voltage varies, between a positive voltage value and a negative voltage value, with the positive voltage value being at least twice that of the negative voltage value, in accordance with a position at which the pixels are selected row by row in the pixel array unit. ### Claim 5 (depends on 4) The method for driving a liquid crystal display device according to claim 4, further comprising supplying the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected such that the scan signal voltage varies in accordance with a position at which the pixels are selected row by row. ### Claim 6 (depends on 4) The method for driving a liquid crystal display device according to claim 4, further comprising: forming a plurality of groups including a plurality of adjacent pixel rows in the pixel array unit, and supplying the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected so as to vary in accordance with a group of the plurality of groups in which the pixels selected row by row are located. ### Claim 7 An electronic apparatus, comprising: a liquid crystal display device, wherein the liquid crystal display device comprises: a pixel array unit in which pixels including a liquid crystal cell are arranged in a matrix; a plurality of scan lines that selects the pixels row by row, the plurality of scan lines extending along a row direction; common wiring that supplies a voltage to a counter electrode in the liquid crystal cell; and a plurality of data lines that supplies a voltage to a pixel electrode in the liquid crystal cell, the plurality of data lines extending along a column direction, wherein each of the pixels includes a pixel transistor connecting a data line in the plurality of data lines and the pixel electrode, and a conductive state/a non-conductive state of the pixel transistor is controlled by a scan signal voltage applied to a scan line of the plurality of scan lines, wherein a signal voltage whose polarity is inverted in regular cycles is supplied to the common wiring, and wherein a scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary, between a positive voltage value and a negative voltage value, with the positive voltage value being at least twice that of the negative voltage value, in accordance with a position at which the pixels are selected row by row in the pixel array unit. ### Claim 8 (depends on 7) The electronic apparatus according to claim 7, wherein the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary in accordance with the position at which the pixels are selected row by row. ### Claim 9 (depends on 7) The electronic apparatus according to claim 7, wherein a plurality of groups including a plurality of adjacent pixel rows is formed in the pixel array unit, and the scan signal voltage supplied to the scan line of the plurality of scan lines when no pixel is selected is supplied so as to vary in accordance with a group of the plurality of groups in which the pixels selected row by row are located.