# US 10,121,417 B2 · Method of extracting average current and method of compensating image information including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,417 B2 - Document ID: US10121417B2 - Status: Granted - Kind: B2 - Application number: 14/927,744 - Filed: 2015-10-30 - Published: 2016-07-28 - Granted: 2018-11-06 - Earliest claimed: 2015-01-27 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jin-Woo Park; Sung-Hoon Bang - Web page: https://patentgrep.com/patent/US10121417B2 ## CPC - G09G 3/3283: in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - 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 2320/048: using evaluation of the usage time - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - 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 method for controlling a display panel includes calculating an on-pixel ratio based on gamma information corresponding to image information, providing maximum current information based on a dimming level, calculating an average current of the display panel based on the on-pixel ratio and the maximum current information, and providing pixel average current information for each of a plurality of pixels in the display panel. The on-pixel ratio is based on the turned-on pixels of the pixels in the display panel. The pixel average current information is determined based on the average current of the display panel. ## Claims ### Claim 1 A method for extracting average current, the method comprising: calculating an on-pixel ratio based on gamma information corresponding to image information, the on-pixel ratio being based on turned-on pixels of a plurality of pixels in a display panel; providing maximum current information based on a dimming level of the display panel using a max current look-up table, the maximum current information corresponding to the dimming level of the display panel being stored in the max current look-up table; calculating an average current of the display panel by multiplying the on-pixel ratio and a maximum current value corresponding to the maximum current information; and providing pixel average current information for each of the pixels, the pixel average current information being determined based on the average current of the display panel using a pixel average current look-up table. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the pixel average current information in the pixel average current look-up table is updated at a predetermined time interval. ### Claim 3 (depends on 2) The method as claimed in claim 2, wherein the predetermined time interval is a predetermined frame interval. ### Claim 4 (depends on 3) The method as claimed in claim 3, wherein, after the predetermined frame interval, the pixel average current information is not updated when a current of a corresponding one of the pixels is 0. ### Claim 5 (depends on 3) The method as claimed in claim 3, wherein after the predetermined frame interval, the pixel average current information is updated when a current of a corresponding one of the pixels is not 0. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein the maximum current value corresponding to the maximum current information increases as the dimming level of the display panel increases. ### Claim 7 (depends on 6) The method as claimed in claim 6, wherein the maximum current information corresponding to the dimming level of the display panel is stored in the maximum current look-up table before the display panel operates. ### Claim 8 (depends on 1) The method as claimed in claim 1, wherein the average current of the display panel is less than or equal to the maximum current value corresponding to the maximum current information. ### Claim 9 (depends on 8) The method as claimed in claim 8, wherein the average current of the display panel increases as the on-pixel ratio increases. ### Claim 10 (depends on 8) The method as claimed in claim 8, wherein the average current of the display panel increases as the maximum current value corresponding to the maximum current information increases. ### Claim 11 (depends on 1) The method as claimed in claim 1, further comprising: calculating a light emitting area of the display panel; and changing the pixel average current look-up table based on the light emitting area of the display panel. ### Claim 12 (depends on 11) The method as claimed in claim 11, wherein deviation among the pixel average current information for the pixels is directly proportional to the light emitting area of the display panel. ### Claim 13 An apparatus, comprising: an on-pixel calculator configured to calculate an on-pixel ratio based on gamma information corresponding to image information, the on-pixel ratio being based on turned-on pixels of a plurality of pixels in a display panel; a maximum current information provider configured to provide maximum current information based on a dimming level of the display panel using a max current look-up table, the maximum current information corresponding to the dimming level of the display panel being stored in the max current look-up table; an average current calculator configured to calculate an average current of the display panel by multiplying the on-pixel ratio and a maximum current value corresponding to the maximum current information; and a pixel information provider configured to provide pixel average current information for each of the pixels, the pixel average current information being determined based on the average current of the display panel using a pixel average current look-up table.