# US 12,008,946 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,008,946 B2 - Document ID: US12008946B2 - Status: Granted - Kind: B2 - Application number: 18/328,133 - Filed: 2023-06-02 - Published: 2024-02-22 - Granted: 2024-06-11 - Earliest claimed: 2022-08-18 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Kyu-Jin Park; Woon-Rok Jang; Tae-Seok Ha - Web page: https://patentgrep.com/patent/US12008946B2 ## CPC - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - 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 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2320/0626: for control of overall brightness - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2320/106: Determination of movement vectors or equivalent parameters within the image - G09G 2330/021: Power management, e.g. power saving - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - 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 display panel that displays an image, a panel driver that drives the display panel, and a driving controller that controls driving of the panel driver. The driving controller compensates first image data corresponding to a first area of the display panel where a still image is displayed during at least a predetermined time period, in a first compensation method to generate first compensation image data for the first area, and compensates second image data corresponding to a second area of the display panel different from the first area in a second compensation method different from the first compensation method that uses a load calculated based on previous image data. ## Claims ### Claim 1 A display device comprising: a display panel configured to display an image; a panel driver configured to drive the display panel; and a driving controller configured to control driving of the panel driver, wherein the driving controller is configured to: compensate first image data corresponding to a first area of the display panel where a still image is displayed during at least a predetermined time period, in a first compensation method to generate first compensation image data for the first area; and compensate second image data corresponding to a second area of the display panel different from the first area in a second compensation method different from the first compensation method that uses a load calculated based on previous image data to generate second compensation image data for the second area. ### Claim 2 (depends on 1) The display device of claim 1, wherein the driving controller comprises: a main current compensation logic circuit configured to calculate the load based on the previous image data, and to output the second compensation image data having a target luminance by compensating the second image data based on the load. ### Claim 3 (depends on 2) The display device of claim 2, wherein a fixed scale factor used to compensate for the first image data in the first compensation method is a constant value, which is not changed depending on the load, and wherein a scale factor used to compensate for the second image data in the second compensation method is changed depending on the load. ### Claim 4 (depends on 2) The display device of claim 2, wherein a fixed scale factor used to compensate for the first image data in the first compensation method is changed depending on the load, wherein a scale factor used to compensate for the second image data in the second compensation method is changed depending on the load, and wherein a change amount of the fixed scale factor is less than a change amount of the scale factor. ### Claim 5 (depends on 2) The display device of claim 2, wherein the driving controller comprises: an area determination logic circuit configured to receive image data during at least ‘k’ frames and to determine the first area and the second area based on the image data, wherein ‘k’ is an integer greater than or equal to 2, and wherein the area determination logic circuit determines the first area as an area where no change occurs in the image data during the ‘k’ frames, and determines the second areas as an area where a change occurs in the image data during the ‘k’ frames. ### Claim 6 (depends on 5) The display device of claim 5, wherein the area determination logic circuit generates coordinate information about at least one of the first area and the second area. ### Claim 7 (depends on 6) The display device of claim 6, wherein the driving controller further comprises: a data extraction logic circuit configured to extract the first image data and the second image data from the image data based on the coordinate information; and a sub-current compensation logic circuit configured to compensate for the first image data in the first compensation method. ### Claim 8 (depends on 5) The display device of claim 5, wherein the second area is provided as a plurality of second areas, and wherein the area determination logic circuit generates coordinate information about the plurality of second areas. ### Claim 9 (depends on 1) The display device of claim 1, wherein the driving controller comprises: a data extraction logic circuit configured to receive coordinate information about at least one of the first area and the second area and an input image signal and to extract a first input image signal for the first area and a second input image signal for the second area from the input image signal based on the coordinate information; and a data conversion logic circuit configured to convert the first input image signal into the first image data and to convert the second input image signal into the second image data. ### Claim 10 (depends on 9) The display device of claim 9, wherein the driving controller further comprises: a sub-current compensation logic circuit configured to compensate the first image data in the first compensation method; a main current compensation logic circuit configured to calculate the load based on the previous image data and to output the second compensation image data having a target luminance by compensating the second image data based on the load. ### Claim 11 (depends on 10) The display device of claim 10, wherein a fixed scale factor used to compensate the first image data in the first compensation method is a constant value, which is not changed depending on the load, and wherein a scale factor used to compensate the second image data in the second compensation method is changed depending on the load. ### Claim 12 (depends on 10) The display device of claim 10, wherein a fixed scale factor used to compensate the first image data in the first compensation method is changed depending on the load, wherein a scale factor used to compensate for the second image data in the second compensation method is changed depending on the load, and wherein a change amount of the fixed scale factor is less than a change amount of the scale factor. ### Claim 13 (depends on 10) The display device of claim 10, wherein the driving controller receives the input image signal in units of frames, and wherein each of the frames includes a data reception section during which the input image signal is received and a blank section during which the coordinate information is received. ### Claim 14 A display device comprising: a display panel configured to display an image; a panel driver configured to drive the display panel; and a driving controller configured to control driving of the panel driver, wherein the driving controller is configured to: receive image data during at least ‘k’ frames where ‘k’ is an integer greater than or equal to 2; and extract first image data, which is maintained to have a grayscale that is less than or equal to a reference grayscale during at least the ‘k’ frames, and second image data, which has a grayscale higher than the reference grayscale or which is not maintained to have a grayscale that is less than or equal to the reference grayscale during the at least ‘k’ frames, from the image data based on a predetermined reference grayscale, and wherein the driving controller compensates the first image data in a first compensation method and compensates the second image data in a second compensation method different from the first compensation method. ### Claim 15 (depends on 14) The display device of claim 14, wherein the driving controller comprises: a main current compensation logic circuit configured to generate first compensation image data by the first image data and second compensation image data by compensating the second image data; and a sub-current compensation logic circuit configured to receive the first compensation image data from the main current compensation logic circuit and to generate re-compensation data by further compensating the first compensation image data. ### Claim 16 (depends on 15) The display device of claim 15, wherein the main current compensation logic circuit is configured to: calculate a load based on previous image data; and output the first compensation image data and the second compensation image data, each of which has target luminance, by compensating the first image data and the second image data based on the load, and wherein a scale factor used to compensate the first image data and the second image data in the main current compensation logic circuit is changed depending on the load. ### Claim 17 (depends on 16) The display device of claim 16, wherein the sub-current compensation logic circuit comprises: a load change determination logic circuit configured to store a scale factor corresponding to a load of a previous frame and to output a scale factor change amount by comparing the scale factor corresponding to the load of the previous frame with a scale factor corresponding to a load of a current frame; and a gamma compensation logic circuit configured to compensate for gamma of the first compensation image data based on the scale factor change amount. ### Claim 18 (depends on 17) The display device of claim 17, wherein the gamma compensation logic circuit increases a gamma value of the first compensation image data when the scale factor change amount has a negative value, and decreases the gamma value of the first compensation image data when the scale factor change amount has a positive value. ### Claim 19 (depends on 16) The display device of claim 16, wherein the sub-current compensation logic circuit comprises: a storage device including a lookup table comprising compensation values according to a grayscale of the first compensation image data and a scale factor change amount; and a sub-compensation logic circuit configured to receive the first compensation image data and the scale factor from the main current compensation logic circuit and to output the re-compensation data by compensating the first compensation image data with reference to the lookup table. ### Claim 20 (depends on 19) The display device of claim 19, wherein, when the scale factor change amount has a negative value, the compensation values have positive values, and wherein, when the scale factor change amount has a positive value, the compensation values have negative values. ### Claim 21 A display device comprising: a display panel configured to display an image; a panel driver configured to drive the display panel; and a driving controller configured to control driving of the panel driver, wherein the driving controller is configured to: compensate first image data corresponding to a first area of the display panel during at least a predetermined time period, using a fixed scale factor independent of a load of the display panel to generate first compensation image data for the first area; and compensate second image data corresponding to a second area of the display panel using the load to generate second compensation image data for the second area. ### Claim 22 (depends on 21) The display device of claim 21, wherein the load is based on previous image data.