# US 10,770,019 B2 · Method and device for driving display panel with two pulse signals for precharging pixel drive cells > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,019 B2 - Document ID: US10770019B2 - Status: Granted - Kind: B2 - Application number: 16/311,396 - Filed: 2018-10-23 - Published: 2020-03-05 - Granted: 2020-09-08 - Earliest claimed: 2018-08-31 - Assignees: Chongqing HKC Optoelectronics Co., Ltd.; Hkc Corporation Limited - Applicants: Chongqing Hkc Optoelectronics Technology Co., Ltd.; Hkc Corporation Limited - Inventors: Feilin Ji - Web page: https://patentgrep.com/patent/US10770019B2 ## CPC - G09G 3/3677: {suitable for active matrices only} - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2310/0205: Simultaneous scanning of several lines in flat panels - G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - G09G 2310/06: Details of flat display driving waveforms - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - 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 method and a device for driving a display panel are provided by embodiments of the present application. The method includes: outputting an initial scanning signal including two pulse signals; pre-charging an x-th row of pixel drive cells when the x-th row of pixel drive cells receive a first pulse signal; and charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive a second pulse signal, writing data into the x-th row of pixel drive cells, and meanwhile, pre-charging an x+4m-th row of pixel drive cells. ## Claims ### Claim 1 A method for driving a display panel, the display panel comprising: pixel display cells in array distribution, and pixel drive cells, configured to respectively drive the pixel display cells; wherein a liquid crystal polarity of liquid crystal molecules in an x-th row is the same as a liquid crystal polarity of liquid crystal molecules in an x+4m-th row, wherein x is an integer greater than or equal to 1, and m is an integer greater than or equal to 1; and wherein the method comprises: outputting an initial scanning signal, wherein the initial scanning signal comprises two pulse signals; pre-charging an x-th row of pixel drive cells when the x-th row of pixel drive cells receive a first pulse signal; and charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive a second pulse signal, writing data into the x-th row of pixel drive cells, and meanwhile, pre-charging an x+4m-th row of pixel drive cells, and wherein the first pulse signal and the second pulse signal are separated by 4n clock cycles, and n is an integer greater than or equal to 1. ### Claim 2 (depends on 1) The method of claim 1, wherein the operation of pre-charging the x+4m-th row of pixel drive cells comprises: pre-charging the x+4m-th row of pixel drive cells to a voltage level of the x-th row of pixel drive cells. ### Claim 3 (depends on 1) The method of claim 1, wherein the operation of pre-charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive the first pulse signal of the initial scanning signal particularly comprises: charging the x-th row of pixel drive cells to a first preset voltage level when the x-th row of pixel drive cells receive the first pulse signal. ### Claim 4 (depends on 1) The method of claim 1, wherein the operation of charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive the second pulse signal of the initial scanning signal comprises: charging the x-th row of pixel drive cells to a preset operating voltage level when the x-th row of pixel drive cells receive the second pulse signal of the initial scanning signal. ### Claim 5 (depends on 1) The method of claim 1, wherein the display panel comprises pixel display cells arranged in the array with 2160 rows. ### Claim 6 (depends on 1) The method of claim 1, wherein the initial scanning signal is a start signal configured to display an image frame on the display panel. ### Claim 7 (depends on 6) The method of claim 6, wherein the initial scanning signal has a frequency of 50-60 Hz. ### Claim 8 (depends on 1) The method of claim 1, wherein the liquid crystal polarity of the liquid crystal molecules is inverted once every two rows, starting from the second row. ### Claim 9 (depends on 8) The method of claim 8, wherein a respective pixel display cell is any one of a red pixel cell, a green pixel cell, and a blue pixel cell. ### Claim 10 A device for driving a display panel, the display panel comprising: pixel display cells in array distribution, and pixel drive cells, configured to respectively drive the pixel display cells; wherein a liquid crystal polarity of liquid crystal molecules in an x-th row is the same as a liquid crystal polarity of liquid crystal molecules in an x+4m-th row, wherein x is an integer greater than or equal to 1, and m is an integer greater than or equal to 1; and wherein the device comprises: a processor, and a memory storing one or more programs including instructions that, when executed by the processor, cause the device to: output an initial scanning signal, wherein the initial scanning signal comprises two pulse signals; pre-charge an x-th row of pixel drive cells when the x-th row of pixel drive cells receive a first pulse signal; and charge the x-th row of pixel drive cells when the x-th row of pixel drive cells receive a second pulse signal, writing data into the x-th row of pixel drive cells, and meanwhile, pre-charging an x+4m-th row of pixel drive cells, and wherein the first pulse signal and the second pulse signal are separated by 4n clock cycles, and n is an integer greater than or equal to 1. ### Claim 11 (depends on 10) The device of claim 10, wherein execution of the instructions causes the device to further: pre-charge the x+4m-th row of pixel drive cells to a voltage level of the x-th row of pixel drive cells. ### Claim 12 (depends on 10) The device of claim 10, wherein execution of the instructions causes the device to further: charge the x-th row of pixel drive cells to a preset operating voltage level when the x-th row of pixel drive cells receive the second pulse signal of the initial scanning signal. ### Claim 13 (depends on 10) The device of claim 10, wherein the liquid crystal polarity of the liquid crystal molecules is inverted once every two rows, starting from the second row. ### Claim 14 (depends on 10) The device of claim 10, wherein a respective pixel display cell is any one of a red pixel cell, a green pixel cell, and a blue pixel cell. ### Claim 15 (depends on 10) The device of claim 10, wherein the initial scanning signal is a start signal configured to display an image frame on the display panel. ### Claim 16 (depends on 15) The device of claim 15, wherein the initial scanning signal has a frequency of 50-60 Hz. ### Claim 17 A method for driving a display panel, the display panel comprising: pixel display cells in array distribution, and pixel drive cells, configured to respectively drive the pixel display cells; wherein a liquid crystal polarity of liquid crystal molecules in an x-th row is the same as a liquid crystal polarity of liquid crystal molecules in an x+4m-th row, the liquid crystal polarity of the liquid crystal molecules is inverted once every two rows, starting from the second row, wherein x is an integer greater than or equal to 1, and m is an integer greater than or equal to 1; and wherein the method comprises: outputting an initial scanning signal, wherein the initial scanning signal comprises two pulse signals; charging the x-th row of pixel drive cells to a first preset voltage level when the x-th row of pixel drive cells receive a first pulse signal; and charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive a second pulse signal, writing data into the x-th row of pixel drive cells, and meanwhile, pre-charging the x+4m-th row of pixel drive cells to a voltage level of the x-th row of pixel drive cells, and wherein the first pulse signal and the second pulse signal are separated by 4n clock cycles, and n is an integer greater than or equal to 1.