# US 12,190,774 B2 · Display device and method of driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,190,774 B2 - Document ID: US12190774B2 - Status: Granted - Kind: B2 - Application number: 18/197,434 - Filed: 2023-05-15 - Published: 2023-11-16 - Granted: 2025-01-07 - Earliest claimed: 2022-05-16 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Chang Ho Hyun - Web page: https://patentgrep.com/patent/US12190774B2 ## CPC - G09G 3/2007: {Display of intermediate tones} - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction - G09G 2320/0626: for control of overall brightness - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2340/0407: Resolution change, inclusive of the use of different resolutions for different screen areas - 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 display device includes a pixel component including a first pixel area in which pixels are disposed at a first density, and a second pixel area in which the pixels are disposed at a second density less than the first density, and a grayscale compensator which converts input grayscale values for the first pixel area to output grayscale values within a first grayscale range, and converts the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range. An upper limit of the second grayscale range is greater than an upper limit of the first grayscale range. ## Claims ### Claim 1 A display device comprising: a pixel component including: a first pixel area in which first pixels are disposed at a first density, the first density defined by a proportion of a pixel disposition area of the first pixels per unit area, and a second pixel area in which second pixels are disposed at a second density lower than the first density, the second density defined by a proportion of a pixel disposition area of the second pixels per unit area; and a grayscale compensator which converts input grayscale values for the first pixel area to output grayscale values within a first grayscale range, converts the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range, wherein an upper limit of the second grayscale range is greater than an upper limit of the first grayscale range. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the grayscale compensator comprises a gain applicator which applies a gain to the input grayscale values and generates gain-applied grayscale values lower than the input grayscale values. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the grayscale compensator further comprises an area discriminator which determines whether the gain-applied grayscale values are grayscale values corresponding to the first pixel area or grayscale values corresponding to the second pixel area. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the grayscale compensator further comprises a look-up table which defines a relationship between the output grayscale values and the gain-applied grayscale values. ### Claim 5 (depends on 4) The display device according to claim 4, wherein the grayscale compensator provides the output grayscale values identical to the gain-applied grayscale values in a case in which the gain-applied grayscale values correspond to the first pixel area, and provides the output grayscale values based on the look-up table in a case in which the gain-applied grayscale values correspond to the second pixel area. ### Claim 6 (depends on 5) The display device according to claim 5, wherein the input grayscale values include first input grayscale values for a first color, second input grayscale values for a second color, and third input grayscale values for a third color, and wherein the gain applicator applies an identical gain to the first input grayscale values, the second input grayscale values, and the third input grayscale values. ### Claim 7 (depends on 6) The display device according to claim 6, wherein the gain-applied grayscale values include first gain-applied grayscale values for the first color, second gain-applied grayscale values for the second color, and third gain-applied grayscale values for the third color, wherein the output grayscale values include first output grayscale values for the first color, second output grayscale values for the second color, and third output grayscale values for the third color, wherein the look-up table defines the first output grayscale values for the first gain-applied grayscale values, the second output grayscale values for the second gain-applied grayscale values, and the third output grayscale values for the third gain-applied grayscale values, and wherein the first output grayscale values, the second output grayscale values and the third output grayscale values are different from each other. ### Claim 8 (depends on 4) The display device according to claim 4, wherein the look-up table defines the output grayscale values only for input-defined grayscale values which are a portion of the gain-applied grayscale values, and wherein the grayscale compensator generates the output grayscale values for the gain-applied grayscale values other than the input-defined grayscale scale values by performing an interpolation operation using the look-up table. ### Claim 9 (depends on 8) The display device according to claim 8, further comprising a grayscale voltage generator which provides grayscale voltages corresponding to the output grayscale values, wherein the grayscale voltages include reference grayscale voltages for reference grayscale values, and divided grayscale voltages generated by dividing the reference grayscale voltages. ### Claim 10 (depends on 9) The display device according to claim 9, wherein the input-defined grayscale values of the look-up table correspond to the reference grayscale values. ### Claim 11 A method of driving a display device comprising a pixel component including a first pixel area in which first pixels are disposed at a first density, and a second pixel area in which second pixels are disposed at a second density lower than the first density, the method comprising: converting input grayscale values for the first pixel area to output grayscale values within a first grayscale range; and converting the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range, wherein an upper limit of the second grayscale range is greater than an upper limit of the first grayscale range, and wherein the first density is defined by a proportion of a pixel disposition area of the first pixels per unit area, and the second density is defined by a proportion of a pixel disposition area of the second pixels per unit area. ### Claim 12 (depends on 11) The method according to claim 11, further comprising generating gain-applied grayscale values lower than the input grayscale values by applying a gain to the input grayscale values. ### Claim 13 (depends on 12) The method according to claim 12, further comprising determining whether the gain-applied grayscale values are grayscale values corresponding to the first pixel area or grayscale values corresponding to the second pixel area. ### Claim 14 (depends on 13) The method according to claim 13, wherein the display device further comprises a look-up table which defines a relationship between the output grayscale values and the gain-applied grayscale values. ### Claim 15 (depends on 14) The method according to claim 14, further comprising: providing the output grayscale values identical to the gain-applied grayscale values in a case in which the gain-applied grayscale values correspond to the first pixel area; and providing the output grayscale values based on the look-up table in a case in which the gain-applied grayscale values correspond to the second pixel area. ### Claim 16 (depends on 15) The method according to claim 15, wherein the input grayscale values include first input grayscale values for a first color, second input grayscale values for a second color, and third input grayscale values for a third color, and wherein an identical gain is applied to the first input grayscale values, the second input grayscale values, and the third input grayscale values. ### Claim 17 (depends on 16) The method according to claim 16, wherein the gain-applied grayscale values include first gain-applied grayscale values for the first color, second gain-applied grayscale values for the second color, and third gain-applied grayscale values for the third color, wherein the output grayscale values include first output grayscale values for the first color, second output grayscale values for the second color, and third output grayscale values for the third color, wherein the look-up table defines the first output grayscale values for the first gain-applied grayscale values, the second output grayscale values for the second gain-applied grayscale values, and the third output grayscale values for the third gain-applied grayscale values, and wherein the first output grayscale values, the second output grayscale values and the third output grayscale values are different from each other. ### Claim 18 (depends on 14) The method according to claim 14, wherein the look-up table defines the output grayscale values only for input-defined grayscale values which are a portion of the gain-applied grayscale values, the method further comprising generating the output grayscale values for the gain-applied grayscale values other than the input-defined grayscale scale values by performing an interpolation operation using the look-up table. ### Claim 19 (depends on 18) The method according to claim 18, wherein the display device further comprises a grayscale voltage generator which provides grayscale voltages corresponding to the output grayscale values, and wherein the grayscale voltages include reference grayscale voltages for reference grayscale values, and divided grayscale voltages generated by dividing the reference grayscale voltages. ### Claim 20 (depends on 19) The method according to claim 19, wherein the input-defined grayscale values of the look-up table correspond to the reference grayscale values.