# US 10,872,544 B2 · Demura system for non-planar screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,544 B2 - Document ID: US10872544B2 - Status: Granted - Kind: B2 - Application number: 16/100,178 - Filed: 2018-08-09 - Published: 2019-12-05 - Granted: 2020-12-22 - Earliest claimed: 2018-06-04 - Assignees: Acer Incorporated - Applicants: Acer Incorporated - Inventors: Jia-Yu Lin; Chih-Chiang Chen - Web page: https://patentgrep.com/patent/US10872544B2 ## CPC - 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 3/03: {specially adapted for displays having non-planar surfaces, e.g. curved displays} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3611: {Control of matrices with row and column drivers} - G09G 2300/0809: Several active elements per pixel in active matrix panels - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2360/145: the light originating from the display screen - 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 Demura system includes a camera module, a distance detection module, a location calibration module and a processing circuit. The camera module is configured to capture images displayed on a non-planar screen during an image-capturing period. The distance detection module is configured to detect the distance between the camera module and the non-planar screen during a test period. The location calibration module is configured to carry the camera module and the distance detection module, adjust the angle of the distance detection module, adjust the angle of the camera module and adjust the location of the camera module. The processing circuit is configured to control the location calibration module according to the data acquired by the distance detection module during the test period so as to move the camera module to a predetermined location. ## Claims ### Claim 1 A Demura system, comprising: a camera module configured to capture an image displayed on a non-planar screen during an image-capturing period; a distance detection module configured to detect a distance between the camera module and the non-planar screen during a test period; a location calibration module, comprising: a first slide guide having a first track along a first direction; a second slide guide having a second track along a second direction; and a swiveling base disposed at an end of the first slide guide and configured to carry the camera module and the distance detection module, adjust an angle of the distance detection module and an angle of the camera module by rotating, and adjust a location of the camera module by moving along the first track and the second track, wherein: the first direction is perpendicular to the second direction; and the first track and the second track cross each other at least at an intersection point; and a processing circuit configured to control the location calibration module according to data acquired by the distance detection module during the test period so as to move the camera module to a predetermined location. ### Claim 2 (depends on 1) The Demura system of claim 1, wherein the location calibration module further comprises a pillar with an adjustable height, and the first track and the second track are fixed to the pillar at the intersection point. ### Claim 3 (depends on 1) The Demura system of claim 1, wherein the location calibration module further comprises: a pillar pivotally connected to the first slide guide and the second slide guide at the intersection point; and a pivot structure disposed at the intersection point for allowing the first slide guide and the second slide guide to rotate around the pillar, thereby adjusting the angle of the distance detection module and the angle of the camera module. ### Claim 4 (depends on 1) The Demura system of claim 1, wherein: the non-planar screen has a constant curvature; the distance detection module includes a proximity sensor; and the processing circuit is further configured to: instruct the location calibration module to rotate the proximity sensor with a predetermined speed and in a predetermined direction during the test period; determine whether the location of the camera module deviates from the predetermined location according to the data acquired by the proximity sensor during the test period; and instruct the location calibration module to move the camera module to the predetermined location when determining that the location of the camera module deviates from the predetermined location. ### Claim 5 (depends on 1) The Demura system of claim 1, wherein the distance detection module is disposed on the camera module. ### Claim 6 (depends on 1) The Demura system of claim 1, wherein: the non-planar screen has a constant curvature; and the processing circuit is further configured to: instruct the location calibration module to rotate the camera module with a predetermined speed and in a predetermined direction during the image-capturing period; receive a plurality of images captured by the camera module during the image-capturing period; acquire a plurality of sub-images from the plurality of images, respectively; and provide a planar image associated with the image displayed on the non-planar screen by compositing the plurality of sub-images. ### Claim 7 (depends on 6) The Demura system of claim 6, wherein the processing circuit is further configured to analyze a difference between the planar image and the image displayed on the non-planar screen, thereby compensating a Mura of the non-planar screen using an algorithm. ### Claim 8 (depends on 1) The Demura system of claim 1, wherein: the non-planar screen has a plurality of distinct curvatures; the camera module includes a zoom camera for capturing a plurality of images using a plurality of focuses at a plurality points of time during the image-capturing period, wherein a value of each focus is associated with a corresponding curvature of the non-planar screen at a corresponding point of time so that the plurality of images have a same resolution; and the processing circuit is further configured to: instruct the location calibration module to rotate the zoom camera with a predetermined speed and in a predetermined direction during the image-capturing period; receive a plurality of images captured by the camera module during the image-capturing period; acquire a plurality of sub-images from the plurality of images, respectively; and provide a planar image associated with the image displayed on the non-planar screen by compositing the plurality of sub-images. ### Claim 9 (depends on 8) The Demura system of claim 8, wherein the processing circuit is further configured to analyze a difference between the planar image and the image displayed on the non-planar screen, thereby compensating a Mura of the non-planar screen using an algorithm. ### Claim 10 (depends on 1) The Demura system of claim 1, wherein: the non-planar screen has a plurality of distinct curvatures; the camera module includes a plurality cameras for capturing a plurality of images at a plurality points of time during the image-capturing period, wherein the plurality cameras are disposed to aligned with a plurality of straight lines parallel to a side of the swiveling base so that at least one of the plurality of images has a specific resolution; and the processing circuit is further configured to: instruct the location calibration module to rotate the plurality of cameras with a predetermined speed and in a predetermined direction during the image-capturing period for capturing the plurality of images; receive the plurality of images captured by each camera; select one of the plurality of images captured at each point of time as a plurality of sub-images, wherein the plurality of sub-images have the specific resolution; and provide a planar image associated with the image displayed on the non-planar screen by compositing the plurality of sub-images. ### Claim 11 (depends on 10) The Demura system of claim 10, wherein the processing circuit is further configured to analyze a difference between the planar image and the image displayed on the non-planar screen, thereby compensating a Mura of the non-planar screen using an algorithm. ### Claim 12 A Demura system, comprising: a camera module configured to capture an image displayed on a non-planar screen having a constant curvature during an image-capturing period; a distance detection module including a proximity sensor and configured to detect a distance between the camera module and the non-planar screen during a test period; a location calibration module configured to carry the camera module and the distance detection module, adjust an angle of the distance detection module, adjust an angle of the camera module and adjust a location of the camera module; and a processing circuit configured to: instruct the location calibration module to rotate the proximity sensor with a predetermined speed and in a predetermined direction during the test period; determine whether the location of the camera module deviates from a predetermined location according to data acquired by the proximity sensor during the test period; and instruct the location calibration module to move the camera module to the predetermined location when determining that the location of the camera module deviates from the predetermined location. ### Claim 13 (depends on 12) The Demura system of claim 12, wherein the distance detection module is disposed on the camera module. ### Claim 14 A Demura system, comprising: a camera module comprising a plurality cameras for capturing a plurality of images displayed on a non-planar screen at a plurality points of time during an image-capturing period, wherein the non-planar screen has a plurality of distinct curvatures, and the plurality cameras are disposed to aligned with a plurality of straight lines parallel to a side of a swiveling base so that at least one of the plurality of images has a specific resolution; a distance detection module configured to detect a distance between the camera module and the non-planar screen during a test period; a location calibration module configured to carry the camera module and the distance detection module, adjust an angle of the distance detection module, adjust an angle of the camera module and adjust a location of the camera module; and a processing circuit configured to: instruct the location calibration module to rotate the plurality of cameras with a predetermined speed and in a predetermined direction during the image-capturing period for capturing the plurality of images; receive the plurality of images captured by each camera; select one of the plurality of images captured at each point of time as a plurality of sub-images, wherein the plurality of sub-images have the specific resolution; and provide a planar image associated with the image displayed on the non-planar screen by compositing the plurality of sub-images. ### Claim 15 (depends on 14) The Demura system of claim 14, wherein the processing circuit is further configured to analyze a difference between the planar image and the image displayed on the non-planar screen, thereby compensating a Mura of the non-planar screen using an algorithm. ### Claim 16 (depends on 14) The Demura system of claim 14, wherein the distance detection module is disposed on the camera module.