# US 2019/0318691 A1 · Structural and low-frequency non-uniformity compensation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318691 A1 - Document ID: US20190318691A1 - Status: Published application - Kind: A1 - Application number: 16/456,138 - Filed: 2019-06-28 - Published: 2019-10-17 - Earliest claimed: 2011-11-29 - Assignees: Ignis Innovation Inc. - Applicants: Ignis Innovation Inc. - Inventors: Jaimal Soni; Ricky Yik Hei Ngan; Gholamreza Chaji; Nino Zahirovic; Joseph Marcel Dionne; Baolin Tian; Allyson Giannikouris - Web page: https://patentgrep.com/patent/US20190318691A1 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - 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 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0295: by monitoring each display pixel - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2354/00: Aspects of interface with display user - G09G 2360/14: Detecting light within display terminals, e.g. using a single or a plurality of photosensors - 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 system for compensating for non-uniformities in an array of solid state devices in a display panel displays images in the panel, and extracts the outputs of a pattern based on structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities. Then the structural non-uniformities are quantified, based on the values of the extracted outputs, and input signals to the display panel are modified to compensate for the structural non-uniformities. Random non-uniformities are compensated by extracting low-frequency non-uniformities across the panel by applying patterns, and taking images of the pattern. The area and resolution of the image are adjusted to match the panel by creating values for pixels in the display, and then low-frequency non-uniformities across the panel are compensated, based on the created values. ## Claims ### Claim at position 1 1-7. (canceled) ### Claim 8 A method of compensating for display non-uniformities due to structural non-uniformities of a display panel including an array of solid state devices, said method comprising: displaying in the display panel at least one image matching one or more non-uniformity patterns due to the structural non-uniformities of the display panel; extracting values quantifying said one or more non-uniformity patterns; and modifying input signals to the display panel with use of said extracted values to compensate for the display non-uniformities due to said structural non-uniformities. ### Claim 9 (depends on 8) The method of claim 8, further comprising prior to displaying, generating said at least one image based on one or more expected non-uniformity patterns due to said structural non-uniformities, each image of the at least one image matching at least one of the one or more expected non-uniformity patterns. ### Claim 10 (depends on 8) The method of claim 8, wherein at least one of the one or more non-uniformity patterns is a spatially repeating pattern. ### Claim 11 (depends on 8) The method of claim 8, wherein at least one of the one or more non-uniformity patterns is substantially a spatial repetition of another of the one or more non-uniformity patterns. ### Claim 12 (depends on 8) The method of claim 8, in which said extracting is performed with use of image sensors in spatial association with the one or more non-uniformity patterns. ### Claim 13 (depends on 12) The method of claim 12, wherein said image sensors are optical sensors. ### Claim 14 (depends on 8) The method of claim 8, wherein black values are inserted for selected areas of said at least one image to reduce the effect of optical cross talk. ### Claim 15 A method of compensating for display non-uniformity in an array of solid state devices in a display panel, said method comprising: extracting values quantifying one or more non-uniformity patterns due to structural non-uniformities of the display panel with use of at least one image matching the one or more non-uniformity patterns due to the structural non-uniformities of the display panel; and compensating for the display non-uniformity with use of said extracted values. ### Claim 16 (depends on 15) The method of claim 15, wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is a spatially repeating pattern. ### Claim 17 (depends on 15) The method of claim 15, wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is substantially a spatial repetition of another of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel. ### Claim 18 (depends on 15) The method of claim 15, further comprising: extracting low-frequency non-uniformities across the display panel by displaying patterns matching the low-frequency non-uniformities; taking images of the displayed patterns using an array of optical sensors; adjusting the spatial area and spatial resolution of the images to match the display panel by creating values for pixels in the display; and compensating low-frequency non-uniformities across the panel based on said created values. ### Claim 19 A method of compensating for display non-uniformities in an array of solid state devices in a display panel, said method comprising: creating target points in the input-output characteristics of the panel; extracting structural non-uniformities by optical measurement of images based on one or more non-uniformity patterns due to structural non-uniformities of the display panel; and compensating for the structural non-uniformities. ### Claim 20 (depends on 19) The method of claim 19, wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is a spatially repeating pattern. ### Claim 21 (depends on 19) The method of claim 19, wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is substantially a spatial repetition of another of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel. ### Claim 22 (depends on 19) The method of claim 19, in which extracting is performed with optical sensors in spatial association with spatial patterns matching the one or more non-uniformity patterns due to the structural non-uniformities of the display. ### Claim 23 (depends on 19) The method of claim 19, further comprising: extracting low-frequency non-uniformities by displaying a flat field and extracting values quantifying the patterns matching the low-frequency non-uniformities, and compensating for the low-frequency non-uniformities.