# US 10,121,402 B2 · Compensation method of Mura phenomenon of curved liquid crystal panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,402 B2 - Document ID: US10121402B2 - Status: Granted - Kind: B2 - Application number: 15/039,415 - Filed: 2016-04-13 - Published: 2018-05-03 - Granted: 2018-11-06 - Earliest claimed: 2016-03-09 - Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Inventors: Hua Zhang - Web page: https://patentgrep.com/patent/US10121402B2 ## CPC - G09G 3/2007: {Display of intermediate tones} - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - G09G 3/36: using liquid crystals - G09G 3/3611: {Control of matrices with row and column drivers} - 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 2320/0626: for control of overall brightness - G09G 2360/145: the light originating from the display screen - 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 The present invention provides a compensation method of Mura phenomenon of a curved liquid crystal panel. First, obtaining image Mura compensation data of the curved liquid crystal panel according to a collected image of a camera, and the image Mura compensation data comprises: a Mura compensation value and a compensation point location corresponded with the Mura compensation value, and the compensation point location is a location of a compensation point in the collected image of the camera, and then implementing correction to the compensation point location in the obtained image Mura compensation data to acquire a compensation point location after correction, which is employed to replace the compensation point location in the image Mura compensation data to obtain plane Mura compensation data of the curved liquid crystal panel, and finally, implementing Mura compensation to the curved liquid crystal panel according to the plane Mura compensation data. ## Claims ### Claim 1 A compensation method of Mura phenomenon of a curved liquid crystal panel, comprising steps of: step 1, providing the curved liquid crystal panel and a camera, and shooting the curved liquid crystal panel of showing an image with the camera, and obtaining image Mura compensation data of the curved liquid crystal panel according to a collected image; wherein the image Mura compensation data comprises: a Mura compensation value and a compensation point location corresponded with the Mura compensation value, and the compensation point location is a location of a compensation point in the collected image of the camera; step 2, implementing correction to the compensation point location in the image Mura compensation data obtained in the step 1 to acquire a compensation point location after correction, and the compensation point location after correction is a position of the compensation point in a plane development diagram of the curved liquid crystal panel, and the compensation point location after correction is employed to replace the compensation point location in the image Mura compensation data to obtain plane Mura compensation data of the curved liquid crystal panel; step 3, implementing Mura compensation to the curved liquid crystal panel according to the plane Mura compensation data obtained in the step 2; wherein in the step 1, the camera is in a fixed position for shooting the LCD panel; wherein in the step 1, the camera is located above a center point of the curved liquid panel for shooting, and wherein in the step 2, a formula of implementing correction to the compensation point location in the image Mura compensation data obtained in the step 1 is: z=arctan(y/x)πrR /180, wherein z is a distance from the position of the compensation point in the plane development diagram of the curved liquid crystal panel to a vertical center line in the plane development diagram, and y is a distance from the position of the compensation point in the image collected by the camera to a vertical center line of the image, and x=Rxcos{arcsin[b/(2R)]}, and R is a radius of curvature as the curved liquid crystal panel is in a curved state, and b is a length of the image collected by the camera. ### Claim 2 (depends on 1) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 1, wherein in the step 1, the image collected by the camera is a plane image. ### Claim 3 (depends on 1) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 1, wherein in the 1, the camera shoots the curved liquid crystal panel three times, and gray scales of images as shooting the curved liquid crystal panel for the three times are different, and there are three copies of the obtained image Mura compensation data. ### Claim 4 (depends on 3) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 3, wherein in the step 1, a gray scale of an image shown by the curved liquid crystal panel is selected from a gray scale range including a 0 gray scale and a maximum gray scale. ### Claim 5 (depends on 4) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 4, wherein the maximum gray scale is 255. ### Claim 6 A compensation method of Mura phenomenon of a curved liquid crystal panel, comprising steps of: step 1, providing the curved liquid crystal panel and a camera, and shooting the curved liquid crystal panel of showing an image with the camera, and obtaining image Mura compensation data of the curved liquid crystal panel according to a collected image; wherein the image Mura compensation data comprises: a Mura compensation value and a compensation point location corresponded with the Mura compensation value, and the compensation point location is a location of a compensation point in the collected image of the camera; step 2, implementing correction to the compensation point location in the image Mura compensation data obtained in the step 1 to acquire a compensation point location after correction, and the compensation point location after correction is a position of the compensation point in a plane development diagram of the curved liquid crystal panel, and the compensation point location after correction is employed to replace the compensation point location in the image Mura compensation data to obtain plane Mura compensation data of the curved liquid crystal panel; step 3, implementing Mura compensation to the curved liquid crystal panel according to the plane Mura compensation data obtained in the step 2; wherein in the step 1, the camera is in a fixed position for shooting the LCD panel; wherein in the step 1, the camera shoots the curved liquid crystal panel three times, and gray scales of images as shooting the curved liquid crystal panel for the three times are different, and there are three copies of the obtained image Mura compensation data; wherein in the step 1, the camera is in above a center point or the curved liquid panel for shooting, and wherein in the step 2, a formula of implementing correction to the compensation point location in the image Mura compensation data obtained in the step 1 is z =arctan(y/x)πrR 180, wherein z is a distance from the position of the compensation point in the plane development diagram of the curved liquid crystal panel to a vertical center line in the plane development diagram, and y is a distance from the position or the compensation point in the image collected by the camera to a vertical center line of the image, and x=Rxcos{arcsin[b/(2R)]}, and R is a radius of curvature as the curved liquid crystal panel is in a curved state, and b is a length of the image collected by the camera. ### Claim 7 (depends on 6) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 6, wherein in the step 1, the image collected by the camera is a plane image. ### Claim 8 (depends on 6) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 6, wherein n the step 1, a gray scale of an image shown by the curved liquid crystal panel is selected from a gray scale range including a 0 gray scale and a maximum gray scale. ### Claim 9 (depends on 8) The compensation method of Mura phenomenon of the curved liquid crystal panel according to claim 8, wherein the maximum gray scale is 255.