# US 12,223,871 B2 · Display device and method of compensating for deterioration thereof, and mobile terminal including the display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,223,871 B2 - Document ID: US12223871B2 - Status: Granted - Kind: B2 - Application number: 18/208,105 - Filed: 2023-06-09 - Published: 2024-05-02 - Granted: 2025-02-11 - Earliest claimed: 2022-10-28 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Dong Gun Lee; Seung Taek Oh; Yong Kyun Choi; Jung Hoon Lee - Web page: https://patentgrep.com/patent/US12223871B2 ## CPC - G09G 3/035: {for flexible display surfaces} - 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 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G09G 2300/0439: Pixel structures - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof - G09G 2354/00: Aspects of interface with display user - 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) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract The present disclosure relates a display device and a method compensating for deterioration thereof, and a mobile terminal including the display device. The display device includes: a display panel including a first pixel area, a second pixel area, and a third pixel area; a first optical device disposed below the display panel or embedded within the display panel in a predetermined sensing area on the display panel, the first optical device facing at least a portion of the first pixel area and a portion of the second pixel area when the display panel is folded or moved; and a pixel deterioration compensation circuit configured to operate to reduce a luminance difference between the first pixel area and the second pixel area by receiving sensing data from the first optical device in a deterioration sensing mode. ## Claims ### Claim 1 A display device, comprising: a display panel including a first pixel area, a second pixel area, and a third pixel area; a first optical device disposed below the display panel, the first optical device facing at least a portion of the first pixel area and at least a portion of the second pixel area when the display panel is in a folded state; and a pixel deterioration compensation circuit configured to compensate a luminance difference between a luminance value of the first pixel area and a luminance value of the second pixel area in a deterioration sensing mode. ### Claim 2 (depends on 1) The display device of claim 1, wherein a pixel density of the second pixel area is lower than a pixel density of the first pixel area, and a maximum data voltage for being applied to pixels in the second pixel area is higher than a maximum data voltage for being applied to pixels in the first pixel area. ### Claim 3 (depends on 2) The display device of claim 2, further comprising: a second optical device disposed below the second pixel area. ### Claim 4 (depends on 1) The display device of claim 1, wherein the third pixel area of the display panel overlaps with a sensing area, at least a portion of pixels in the third pixel area emit light when a fingerprint recognition event occurs, and none of the pixels in the third pixel area emit light in the deterioration sensing mode. ### Claim 5 (depends on 1) The display device of claim 1, wherein the display panel enters the deterioration sensing mode when the display panel is in the folded state. ### Claim 6 (depends on 1) The display device of claim 1, wherein, in a display mode, pixel data of an input image is written to pixels in the first pixel area, the second pixel area, and the third pixel area so that the input image is displayed on the display panel, and wherein, in the deterioration sensing mode, the pixels in the first pixel area and the second pixel area are written with predetermined display pattern data so that the pixels of the first pixel area and the second pixel area emit light. ### Claim 7 (depends on 1) The display device of claim 1, wherein the pixel deterioration compensation circuit includes: a luminance measurement part configured to receive the luminance value of the first pixel area and the luminance value of the second pixel area from the first optical device to determine the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area; and a gamma correction part configured to derive a compensation value based on the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area, and compensate the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area by updating digital gamma data by adding the compensation value to initial gamma compensation data. ### Claim 8 (depends on 7) The display device of claim 7, wherein the gamma correction part is configured to: modulate pixel data of an input image into the digital gamma data. ### Claim 9 (depends on 8) The display device of claim 8, further comprising: a data driver configured to convert the pixel data modulated by the gamma correction part into a data voltage. ### Claim 10 A method of compensating for deterioration of a display device, the method comprising: driving pixels in a first pixel area and pixels in a second pixel area by writing display pattern data to the pixels in the first and second pixel areas while a display panel is folded; driving an optical device disposed in a sensing area opposite the first pixel area and the second pixel area to measure a luminance value of the first pixel area and a luminance value of the second pixel area to determine a luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area; deriving a compensation value based on the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area; and updating digital gamma data for pixels in at least one of the first pixel area and the second pixel area using the compensation value. ### Claim 11 A mobile terminal, comprising: a display panel including a first pixel area, a second pixel area, and a third pixel area; a first optical device overlapping the third pixel area, the first optical device facing at least a portion of the first pixel area and at least a portion of the second pixel area when the display panel is in a folded state; and a luminance difference compensation circuit configured to compensate a luminance difference between a luminance value of the first pixel area and a luminance value of the second pixel area, wherein the first optical device is configured to measure the luminance value of the first pixel area and the luminance value of the second pixel area, and transmit the luminance value of the first pixel area and the luminance value of the second pixel area. ### Claim 12 (depends on 11) The mobile terminal of claim 11, wherein the first optical device includes at least one sensor pixel of an image sensor, an infrared sensor element or an illumination sensor element, and wherein the at least one sensor pixel is disposed below the display panel. ### Claim 13 (depends on 11) The mobile terminal of claim 11, wherein a pixel density of the second pixel area is lower than a pixel density of the first pixel area. ### Claim 14 (depends on 11) The mobile terminal of claim 11, wherein a maximum data voltage for being applied to pixels in the second pixel area is higher than a maximum data voltage for being applied to pixels in the first pixel area. ### Claim 15 (depends on 11) The mobile terminal of claim 11, wherein the luminance difference compensation circuit includes: a luminance measurement part configured to receive the luminance value of the first pixel area and the luminance value of the second pixel area from the first optical device to measure the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area; and a gamma correction part configured to derive a compensation value based on the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area, and compensate the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area. ### Claim 16 (depends on 15) The mobile terminal of claim 15, wherein the gamma correction part is configured to compensate the luminance difference between the luminance value of the first pixel area and the luminance value of the second pixel area by updating digital gamma data by adding the compensation value to initial gamma compensation data. ### Claim 17 (depends on 11) The mobile terminal of claim 11, further comprising a second optical device disposed below the second pixel area. ### Claim 18 (depends on 17) The mobile terminal of claim 17, wherein the second optical device includes a camera. ### Claim 19 (depends on 11) The mobile terminal of claim 11, wherein the first optical device includes a fingerprint recognition sensor.