# US 12,223,874 B2 · Method and apparatus for adjusting brightness of display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,223,874 B2 - Document ID: US12223874B2 - Status: Granted - Kind: B2 - Application number: 17/618,554 - Filed: 2021-11-23 - Published: 2024-09-05 - Granted: 2025-02-11 - Earliest claimed: 2021-11-05 - Assignees: Huizhou China Star Optoelectronics Display Co., Ltd.; Tcl China Star Optoelectronics Technology Co., Ltd. - Applicants: Huizhou China Star Optoelectronics Display Co., Ltd.; TCL China Star Optoelectronics Technology Co., Ltd. - Inventors: Yoongu Kim; Yizhuo Zhao; Yuhua Chang - Web page: https://patentgrep.com/patent/US12223874B2 ## CPC - G09G 3/2007: {Display of intermediate tones} - 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 2320/0247: 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 2320/0626: for control of overall brightness - G09G 2320/0693: Calibration of display systems - 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 an apparatus for adjusting a brightness of a display are provided. The method includes: acquiring a gray scale number and a working frequency; determining a first gray scale compensation value of a preset calibration area using a preset gray scale compensation mapping table; determining a second gray scale compensation value of a non-preset calibration area according to the first gray scale compensation value; controlling, according to the first gray scale compensation value, the preset calibration area for displaying; and controlling, according to the second gray scale compensation value, the non-preset calibration area for displaying. ## Claims ### Claim 1 A method for adjusting a brightness of a display, comprising: dividing pixel points of a display screen into a preset calibration area and a non-preset calibration area, wherein the non-preset calibration area comprises a first type of non-preset calibration area and a second type of non-preset calibration area, the first type of non-preset calibration area is located between two preset calibration areas, and end points of the second type of non-preset calibration area are end points of four different preset calibration areas respectively; acquiring a gray scale number for displaying and a working frequency for displaying of a display screen; determining a first gray scale compensation value of the preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table, wherein gray scale numbers and gray scale compensation values of the preset calibration area at working frequency nodes in the preset gray scale compensation mapping table are in a one-to-one correspondence; determining a second gray scale compensation value of the first type of non-preset calibration area of the display screen according to first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area; determining a second gray scale compensation value of the second type of non-preset calibration area of the display screen according to first gray scale compensation values of the four different preset calibration areas sharing end points with the second type of non-preset calibration area; controlling, according to the first gray scale compensation value of the preset calibration area, the preset calibration area to reach a preset brightness for displaying; controlling, according to the second gray scale compensation value of the first type of non-preset calibration area, the first type of non-preset calibration area to reach the preset brightness for displaying; and controlling, according to the second gray scale compensation value of the second type of non-preset calibration area, the second type of non-preset calibration area to reach the preset brightness for displaying; wherein each preset calibration area is set as one pixel unit, and pixel points in one preset calibration area correspond to one first gray scale compensation value. ### Claim 2 (depends on 1) The method for adjusting a brightness of a display as claimed in claim 1, wherein the determining a first gray scale compensation value of the preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table comprises: if the working frequency is one of the working frequency nodes in the gray scale compensation mapping table, determining the first gray scale compensation value of the preset calibration area of the display screen according to the gray scale number for displaying, the working frequency, and the gray scale compensation mapping table. ### Claim 3 (depends on 1) The method for adjusting a brightness of a display as claimed in claim 1, wherein the determining a first gray scale compensation value of the preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table comprises: if the working frequency is not one of the working frequency nodes in the gray scale compensation mapping table, determining a first working frequency node and a second working frequency node in the gray scale compensation mapping table adjacent to the working frequency; acquiring a third gray scale compensation value of the preset calibration area according to the first working frequency node; acquiring a fourth gray scale compensation value of the preset calibration area of the display screen according to the second working frequency node; and determining the first gray scale compensation value of the preset calibration area according to the third gray scale compensation value and the fourth gray scale compensation value. ### Claim 4 (depends on 1) The method for adjusting a brightness of a display as claimed in claim 1, wherein the determining a second gray scale compensation value of the first type of non-preset calibration area of the display screen according to first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area comprises: determining a second gray scale compensation value of each pixel point in the first type of non-preset calibration area by interpolating according to the first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area and longitudinal coordinates of the pixel points in the first type of non-preset calibration area. ### Claim 5 (depends on 1) The method for adjusting a brightness of a display as claimed in claim 1, wherein the determining a second gray scale compensation value of the second type of non-preset calibration area of the display screen according to first gray scale compensation values of the four different preset calibration areas sharing end points with the second type of non-preset calibration area comprises: determining a second gray scale compensation value of each pixel point in the second type of non-preset calibration area by interpolating according to the first gray scale compensation values of the four different preset calibration areas sharing end points with the second type of non-preset calibration area and both longitudinal coordinates and transverse coordinates of the pixel points in the second type of non-preset calibration area respectively. ### Claim 6 A method for adjusting a brightness of a display, comprising: acquiring a gray scale number for displaying and a working frequency for displaying of a display screen; determining a first gray scale compensation value of a preset calibration area of the display screen using a preset gray scale compensation mapping table according to the to-be-displayed gray scale number and the working frequency, wherein gray scale numbers and gray scale compensation values of the preset calibration area at working frequency nodes in the preset gray scale compensation mapping table are in a one-to-one correspondence; determining a second gray scale compensation value of a first type of non-preset calibration area located between two preset calibration areas of the display screen according to first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area; determining a second gray scale compensation value of a second type of non-preset calibration area sharing end points with four different preset calibration areas of the display screen according to first gray scale compensation values of the four different preset calibration areas respectively; controlling, according to the first gray scale compensation value of the preset calibration area, the preset calibration area to reach a preset brightness for displaying; controlling, according to the second gray scale compensation value of the first type of non-preset calibration area, the first type of non-preset calibration area to reach the preset brightness for displaying; and controlling, according to the second gray scale compensation value of the second type of non-preset calibration area, the second type of non-preset calibration area to reach the preset brightness for displaying; wherein each preset calibration area is set as one pixel unit, and pixel points in one preset calibration area correspond to one first gray scale compensation value. ### Claim 7 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein the determining a first gray scale compensation value of a preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table comprises: if the working frequency is one of the working frequency nodes in the gray scale compensation mapping table, determining the first gray scale compensation value of the preset calibration area of the display screen according to the gray scale number for displaying, the working frequency, and the gray scale compensation mapping table. ### Claim 8 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein the working frequency nodes are uniformly spaced apart from each other. ### Claim 9 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein the working frequency nodes are randomly spaced apart from each other. ### Claim 10 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein the determining a first gray scale compensation value of a preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table comprises: if the working frequency is not one of the working frequency nodes in the gray scale compensation mapping table, determining a first working frequency node and a second working frequency node in the gray scale compensation mapping table adjacent to the working frequency; acquiring a third gray scale compensation value of the preset calibration area according to the first working frequency node; acquiring a fourth gray scale compensation value of the preset calibration area of the display screen according to the second working frequency node; and determining the first gray scale compensation value of the preset calibration area according to the third gray scale compensation value and the fourth gray scale compensation value. ### Claim 11 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein before the acquiring a gray scale number for displaying and a working frequency for displaying of a display screen, the method comprises: dividing pixel points of the display screen into the preset calibration area and the non-preset calibration area comprising the first type of non-preset calibration area and the second type of non-preset calibration area. ### Claim 12 (depends on 11) The method for adjusting a brightness of a display as claimed in claim 11, wherein the determining a second gray scale compensation value of the first type of non-preset calibration area of the display screen according to first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area comprises: determining a second gray scale compensation value of each pixel point in the first type of non-preset calibration area by interpolating according to the first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area and longitudinal coordinates of the pixel points in the first type of non-preset calibration area. ### Claim 13 (depends on 11) The method for adjusting a brightness of a display as claimed in claim 11, wherein the determining a second gray scale compensation value of the second type of non-preset calibration area of the display screen according to first gray scale compensation values of the four different preset calibration areas adjacent to the first type of non-preset calibration area comprises: determining a second gray scale compensation value of each pixel point in the second type of non-preset calibration area by interpolating according to the first gray scale compensation values of the four different preset calibration areas sharing end points with the second type of non-preset calibration area and both longitudinal coordinates and transverse coordinates of the pixel points in the second type of non-preset calibration area respectively. ### Claim 14 (depends on 11) The method for adjusting a brightness of a display as claimed in claim 11, wherein the first gray scale compensation value comprises a first positive polarity compensation value and a first negative polarity compensation value, the second gray scale compensation value comprises a second positive polarity compensation value and a second negative polarity compensation value, and the determining a second gray scale compensation value of a non-preset calibration area of the display screen according to the first gray scale compensation value comprises: determining the second positive polarity compensation value of the non-preset calibration area of the display screen according to the first positive polarity compensation value; and determining the second negative polarity compensation value of the non-preset calibration area of the display screen according to the first negative polarity compensation value. ### Claim 15 (depends on 14) The method for adjusting a brightness of a display as claimed in claim 14, wherein the determining the second positive polarity compensation value of the non-preset calibration area of the display screen according to the first positive polarity compensation value comprises: determining a second positive polarity compensation value of each pixel point in the first type of non-preset calibration area according to first positive polarity compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area. ### Claim 16 (depends on 14) The method for adjusting a brightness of a display as claimed in claim 14, wherein the determining the second negative polarity compensation value of the non-preset calibration area of the display screen according to the first negative polarity compensation value comprises: determining a second negative polarity compensation value of each pixel point in the second type of non-preset calibration area according to first negative polarity compensation values of a plurality of preset calibration areas sharing end points with the second type of non-preset calibration area. ### Claim 17 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein before the acquiring a gray scale number for displaying and a working frequency for displaying of a display screen, the method comprises: adjusting a brightness of the preset calibration area of the display to the preset brightness with a target gray scale number at a target frequency, to determine a gray scale compensation value in the gray scale compensation mapping table corresponding to the target frequency and the target gray scale number. ### Claim 18 (depends on 6) The method for adjusting a brightness of a display as claimed in claim 6, wherein the preset brightness is a brightness corresponding to gray scale numbers at a highest working frequency of the display screen. ### Claim 19 An apparatus for adjusting a brightness of a display, comprising: an information acquisition module configured to acquire a gray scale number for displaying and a working frequency for displaying of a display screen; a compensation value analysis module communicatively connected to the information acquisition module and configured to: determine a first gray scale compensation value of a preset calibration area of the display screen according to the gray scale number for displaying and the working frequency using a preset gray scale compensation mapping table, wherein gray scale numbers and gray scale compensation values of the preset calibration area at working frequency nodes in the preset gray scale compensation mapping table are in a one-to-one correspondence, determine a second gray scale compensation value of a first type of non-preset calibration area located between two preset calibration areas of the display screen according to first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area, and determine a second gray scale compensation value of a second type of non-preset calibration area sharing end points with four different preset calibration areas of the display screen according to first gray scale compensation values of the four different preset calibration areas respectively; and a pixel display module communicatively connected to the compensation value analysis module and configured to: control, according to the first gray scale compensation value of the preset calibration area, the preset calibration area to display, control, according to the second gray scale compensation value of the first type of non-preset calibration area, the first type of non-preset calibration area to display, and control, according to the second gray scale compensation value of the second type of non-preset calibration area, the second type of non-preset calibration area to display; wherein each preset calibration area is set as one pixel unit, and pixel points in one preset calibration area correspond to one first gray scale compensation value. ### Claim 20 (depends on 19) The apparatus as claimed in claim 19, wherein the compensation value analysis module is further configured to: divide pixel points of the display screen into the preset calibration area and the non-preset calibration area comprising the first type of non-preset calibration area and the second type of non-preset calibration area; and determine a second gray scale compensation value of each pixel point in the first type of non-preset calibration area by interpolating according to the first gray scale compensation values of the two preset calibration areas adjacent to the first type of non-preset calibration area and longitudinal coordinates of the pixel points in the first type of non-preset calibration area; and determine a second gray scale compensation value of each pixel point in the second type of non-preset calibration area by interpolating according to the first gray scale compensation values of the four different preset calibration areas sharing end points with the second type of non-preset calibration area and both longitudinal coordinates and transverse coordinates of the pixel points in the second type of non-preset calibration area respectively.