# US 10,770,023 B2 · Dynamic overdrive for liquid crystal displays > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,023 B2 - Document ID: US10770023B2 - Status: Granted - Kind: B2 - Application number: 16/116,862 - Filed: 2018-08-29 - Published: 2019-12-05 - Granted: 2020-09-08 - Earliest claimed: 2018-05-29 - Assignees: Synaptics Incorporated - Applicants: Synaptics Incorporated - Inventors: Stephen L. Morein - Web page: https://patentgrep.com/patent/US10770023B2 ## CPC - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3688: {suitable for active matrices only} - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0252: Improving the response speed - G09G 2320/0257: Reduction of after-image effects - G09G 2320/0285: using tables for spatial correction of display data - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - 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 apparatus for overdriving pixel elements to a desired voltage. A display device comprises a pixel array and overdrive circuitry to determine a current pixel value for a first pixel element of the pixel array and a target pixel value for the first pixel element. The overdrive circuitry is further configured to determine a first voltage to be applied to the first pixel element to cause the first pixel element to transition from the current pixel value to the target pixel value by a first instance of time. The first voltage is determined based at least in part on a position of the first pixel element in the pixel array. The display device further comprises a data driver to apply the first voltage to the first pixel element before the first instance of time and a backlight to illuminate the pixel array at the first instance of time. ## Claims ### Claim 1 A method, comprising: determining a current pixel value for a first pixel element of a pixel array; determining a target pixel value for the first pixel element; determining a target voltage which causes the first pixel element to settle at the target pixel value; selecting the target voltage or an overdrive voltage to be applied to the first pixel element to cause the first pixel element to transition from the current pixel value to the target pixel value by a first instance of time, wherein the selection is based at least in part on a position of the first pixel element in the pixel array; applying the selected voltage to the first pixel element before the first instance of time; and activating one or more light sources to illuminate the pixel array at the first instance of time. ### Claim 2 (depends on 1) The method of claim 1, wherein the position corresponds to a row position of the first pixel element in the pixel array. ### Claim 3 (depends on 2) The method of claim 2, wherein the target voltage is selected when the row position of the first pixel element is located below a threshold line number of the pixel array. ### Claim 4 (depends on 3) The method of claim 3, wherein the overdrive voltage is selected when the row position of the first pixel element is located above the threshold line number of the pixel array, wherein the overdrive voltage is different than the target voltage. ### Claim 5 (depends on 1) The method of claim 1, further comprising: determining the overdrive voltage based at least in part on a plurality of lookup tables (LUTs), wherein each of the LUTs indicates a plurality of overdrive voltages for pixel elements in a corresponding row of the pixel array. ### Claim 6 (depends on 5) The method of claim 5, wherein the determining of the overdrive voltage further comprises: selecting a first LUT of the plurality of LUTs based at least in part on the row position of the first pixel element, wherein the first LUT is associated with a row of the pixel array below the row position of the first pixel element; selecting a second LUT of the plurality LUTs based at least in part on the row position of the first pixel element, wherein the second LUT is associated with a row of the pixel array above the row position of the first pixel element; and determining the overdrive voltage based at least in part on a linear interpolation of the first LUT and the second LUT. ### Claim 7 (depends on 6) The method of claim 6, wherein the determining of the overdrive voltage further comprises: generating an interpolated LUT based on the linear interpolation of the first and second LUTs; selecting at least two rows of the interpolated LUT based on the current pixel value; selecting at least two columns of the interpolated LUT based on the target pixel value; and determining the overdrive voltage based on a bilinear interpolation of the selected rows and columns of the interpolated LUT. ### Claim 8 (depends on 6) The method of claim 6, wherein the first and second LUTs are selected based at least in part on a temperature of the pixel array. ### Claim 9 (depends on 1) The method of claim 1, further comprising: determining a first voltage to be applied to a second pixel element of the pixel array to cause the second pixel element to transition from the current pixel value to the target pixel value by the first instance of time, wherein the first voltage is different than the selected voltage for the first pixel element. ### Claim 10 (depends on 9) The method of claim 9, further comprising: applying the first voltage to the second pixel element before the first instance of time, wherein the first pixel element is located in a different row of the pixel array than the first pixel element. ### Claim 11 A display device comprising: a pixel array; overdrive circuitry configured to: determine a current pixel value for a first pixel element of the pixel array; determine a target pixel value for the first pixel element; determine a target voltage which causes the first pixel element to settle at the target pixel value; and select the target voltage or an overdrive voltage to be applied to the first pixel element to cause the first pixel element to transition from the current pixel value to the target pixel value by a first instance of time, wherein the selection is based at least in part on a position of the first pixel element in the pixel array; a data driver configured to apply the selected voltage to the first pixel element before the first instance of time; and a backlight configured to illuminate the pixel array at the first instance of time. ### Claim 12 (depends on 11) The display device of claim 11, wherein the position corresponds to a row position of the first pixel element in the pixel array. ### Claim 13 (depends on 12) The display device of claim 12, wherein the target voltage is selected when the row position of the first pixel element is located below a threshold line number of the pixel array. ### Claim 14 (depends on 13) The display device of claim 13, wherein the overdrive voltage is selected when the row position is located above the threshold line number of the pixel array, wherein the overdrive voltage is different than the target voltage. ### Claim 15 (depends on 11) The display device of claim 11, wherein the overdrive circuitry comprises: a lookup table (LUT) repository configured to store a plurality of LUTs, wherein each of the LUTs indicates a plurality of overdrive voltages for pixel elements in a corresponding row of the pixel array; and an overdrive voltage generator to determine the overdrive voltage based at least in part on the plurality of LUTs. ### Claim 16 (depends on 15) The display device of claim 15, wherein the overdrive voltage generator is further configured to: select a first LUT of the plurality of LUTs based at least in part on the row position of the first pixel element, wherein the first LUT is associated with a row of the pixel array below the row position of the first pixel element; select a second LUT of the plurality LUTs based at least in part on the row position of the first pixel element, wherein the second LUT is associated with a row of the pixel array above the row position of the first pixel element; and determine the overdrive voltage based at least in part on a linear interpolation of the first LUT and the second LUT. ### Claim 17 (depends on 16) The display device of claim 16, wherein the overdrive voltage generator comprises: an LUT generator configured to generate an interpolated LUT based on the linear interpolation of the first and second LUTs; and an overdrive voltage interpolator configured to: select at least two rows of the interpolated LUT based on the current pixel value; select at least two columns of the interpolated LUT based on the target pixel value; and determine the overdrive voltage based on a bilinear interpolation of the selected rows and columns of the interpolated LUT. ### Claim 18 (depends on 16) The display device of claim 16, wherein the overdrive voltage generator is to select the first and second LUTs based at least in part on a temperature of the display device. ### Claim 19 (depends on 11) The display device of claim 11, wherein the overdrive circuitry is further configured to: determine a first voltage to be applied to a second pixel element of the pixel array to cause the second pixel element to transition from the current pixel value to the target pixel value by the first instance of time, wherein the first voltage is different than the selected voltage for the first pixel element. ### Claim 20 (depends on 19) The display device of claim 19, wherein the data driver is further configured to: apply the first voltage to the second pixel element before the first instance of time, wherein the first pixel element is located in a different row of the pixel array than the first pixel element.