# US 11,908,433 B2 · Display device and driving method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,433 B2 - Document ID: US11908433B2 - Status: Granted - Kind: B2 - Application number: 18/134,431 - Filed: 2023-04-13 - Published: 2023-08-10 - Granted: 2024-02-20 - Earliest claimed: 2020-10-16 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Ki Hyun Pyun; Jang Mi Lee; Eun Jin Choi - Web page: https://patentgrep.com/patent/US11908433B2 ## CPC - G09G 5/10: Intensity circuits - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - 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 2320/0646: Modulation of illumination source brightness and image signal correlated to each other - G09G 2330/021: Power management, e.g. power saving - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - 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 part partitioned into blocks; a scale factor provider which calculates a first load value of input image data for the pixel part, calculates a second load value of the input image data for each block, and generates a scale factor based on the first and second load values; and a timing controller which generates image data by scaling gray values of the input image data based on the scale factor. The scale factor provider generates a first scale factor for commonly controlling the gray values for the blocks based on the first load value, when the first load value is greater than or equal to a reference load value, and generates a second scale factor for controlling gray value for each block based on the first and second load values, when the first load value is less than the reference load value. ## Claims ### Claim 1 A display device comprising: a pixel part including a plurality of pixels, wherein the pixel part is partitioned into a plurality of blocks; a scale factor provider which calculates a first load value of input image data corresponding to all of the blocks of the pixel part, calculates a second load value of the input image data for each of the blocks, and generates a scale factor based on the first load value and the second load value; and a timing controller which generates image data by scaling gray values of the input image data based on the scale factor, wherein when the first load value is less than a reference load value, a luminance of an image displayed in a reference block which has a greatest second load value among the blocks is higher than a luminance of an image displayed in a neighboring block. ### Claim 2 (depends on 1) The display device of claim 1, wherein as the first load value decreases, the scale factor generator controls the scale factor corresponding to the reference block to increase. ### Claim 3 (depends on 1) The display device of claim 1, wherein as the reference block is closer to a central portion of the pixel part, the scale factor generator controls the scale factor corresponding to the reference block to increase. ### Claim 4 (depends on 1) The display device of claim 1, wherein as a difference in the second load value between the reference block and the neighboring block increases, the scale factor generator controls the scale factor corresponding to the reference block to increase. ### Claim 5 (depends on 1) The display device of claim 1, wherein as a difference in the second load value between the reference block and the neighboring block increases, the scale factor generator controls the scale factor corresponding to the neighboring block to decrease. ### Claim 6 (depends on 1) The display device of claim 1, wherein as the neighboring block is farther away from the reference block, the scale factor generator controls the scale factor corresponding to the neighboring block to decrease. ### Claim 7 (depends on 1) The display device of claim 1, wherein when the first load value is greater than or equal to the reference load value, a luminance of an image displayed in the blocks decreases. ### Claim 8 (depends on 7) The display device of claim 7, wherein as the first load value increases, the scale factor generator controls the scale factor corresponding to the blocks to decrease. ### Claim 9 A driving method of a display device which includes a pixel part including a plurality of pixels and is partitioned into a plurality of blocks, the driving method comprising: calculating a first load value of input image data corresponding to all of the blocks of the pixel part; calculating second load values of the input image data for each of the blocks; generating a scale factor based on the first load value and the second load values; generating image data by scaling gray values of the input image data by using the scale factor, and generating a data signal corresponding to the image data to supply the data signal to the pixels, wherein when the first load value is less than a reference load value, a luminance of an image displayed in a reference block which has a greatest second load value among the blocks is higher than a luminance of an image displayed in a neighboring block. ### Claim 10 (depends on 9) The driving method of the display device of claim 9, wherein the generating the scale factor includes: controlling the scale factor corresponding to the reference block to increase as the first load value decreases. ### Claim 11 (depends on 9) The driving method of the display device of claim 9, wherein the generating the scale factor includes: controlling the scale factor corresponding to the reference block to increase as the reference block is closer to a central portion of the pixel part. ### Claim 12 (depends on 9) The driving method of the display device of claim 9, wherein the generating the scale factor includes: controlling the scale factor corresponding to the reference block to increase as a difference in the second load value between the reference block and the neighboring block increases. ### Claim 13 (depends on 9) The driving method of the display device of claim 9, wherein the generating the scale factor includes: controlling the scale factor corresponding to the neighboring block to decrease as a difference in the second load value between the reference block and the neighboring block increases. ### Claim 14 (depends on 9) The driving method of the display device of claim 9, wherein the generating the scale factor includes: controlling the scale factor corresponding to the neighboring block to decrease as the neighboring block is farther away from the reference block. ### Claim 15 (depends on 9) The driving method of the display device of claim 9, wherein when the first load value is greater than or equal to the reference load value, a luminance of an image displayed in the blocks decreases. ### Claim 16 (depends on 15) The driving method of the display device of claim 15, wherein the generating the scale factor includes: controlling the scale factor corresponding to the blocks to decrease as the first load value increases.