# US 12,217,667 B2 · Display panel, brightness compensation method and displaying device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,667 B2 - Document ID: US12217667B2 - Status: Granted - Kind: B2 - Application number: 17/509,822 - Filed: 2021-10-25 - Published: 2022-09-15 - Granted: 2025-02-04 - Earliest claimed: 2021-03-09 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Xing Fan; Chao Kong; Xiangmin Wen - Web page: https://patentgrep.com/patent/US12217667B2 ## CPC - G09G 3/3225: using an active matrix - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/13: comprising photosensors that control luminance - H10K 59/878: {comprising reflective means} - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - 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 - H10K 2102/00: Constructional details relating to the organic devices covered by this subclass - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract The disclosure provides a display panel, a compensation of brightness method and a displaying device. The display panel comprises an array substrate, a luminescent layer, a plurality of optical film layers and a photoelectric sensor, wherein the luminescent layer is located on one side of the array substrate, the array substrate is used for driving the luminescent layer to emit light, the optical film layers are located on a side, away from the array substrate, of the luminescent layer, light emitted by the luminescent layer forms optical waveguide on the array substrate and/or the optical film layers, and the photoelectric sensor is used for acquiring the optical waveguide to perform compensation of brightness on the light emitted by the luminescent layer according to data of the optical waveguide. ## Claims ### Claim 1 A display panel, comprising: an array substrate; a luminescent layer located on one side of the array substrate, wherein the array substrate is configured for driving the luminescent layer to emit light; a plurality of optical film layers located on a side, away from the array substrate, of the luminescent layer, wherein light emitted by the luminescent layer forms an optical waveguide on the array substrate and/or the optical film layers; and a photoelectric sensor, configured for acquiring the optical waveguide to perform compensation of brightness on the light emitted by the luminescent layer according to data of the optical waveguide, wherein the luminescent layer comprises a plurality of sub-luminescent layers, the plurality of sub-luminescent layers are disposed on a same layer at intervals, the array substrate comprises: a first pixel defining layer located between two adjacent said sub-luminescent layers, the photoelectric sensor is disposed corresponding to the first pixel defining layer, the luminescent layer further comprises a first reflecting layer attached to a surface of the first pixel defining layer, and the optical waveguide passes through the first pixel defining layer and is reflected by the first reflecting layer to the photoelectric sensor. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the array substrate further comprises a second pixel defining layer, the second pixel defining layer is disposed in the first pixel defining layer, a second reflecting layer is attached to a surface of the second pixel defining layer, and the optical waveguide passes through the second pixel defining layer and is reflected by the second reflecting layer to the photoelectric sensor. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein the second pixel defining layer is of an inverted trapezoid shape, and the second reflecting layer comprises a top surface and a first oblique surface; and the top surface is disposed on a side, away from the array substrate, of the second pixel defining layer, the first oblique surface is attached to an oblique edge of the second pixel defining layer and connected to the top surface, and the optical waveguide passes through the second pixel defining layer and is reflected by the top surface and the first oblique surface to the photoelectric sensor. ### Claim 4 (depends on 2) The display panel according to claim 2, wherein the second pixel defining layer is of an inverted trapezoid shape, and the second reflecting layer comprises a top surface, a first oblique surface and a second oblique surface; and the first top surface is disposed on a side, away from the array substrate, of the second pixel defining layer, the first oblique surface and the second oblique surface are symmetrically disposed on two sides of the top surface and are attached to the second pixel defining layer, and the optical waveguide passes through the second pixel defining layer to the second oblique surface and is reflected by the second oblique surface to the photoelectric sensor. ### Claim 5 (depends on 2) The display panel according to claim 2, wherein the second pixel defining layer is trapezoidal, and the second reflecting layer comprises a top surface and a first oblique surface; and the top surface is attached to a side, away from the array substrate, of the second pixel defining layer, the first oblique surface is attached to an oblique surface of the second pixel defining layer and connected to the top surface, and the optical waveguide passes through the second pixel defining layer and is reflected to the photoelectric sensor through the top surface. ### Claim 6 (depends on 2) The display panel according to claim 2, wherein the optical film layer comprises a thin film packaging layer and a light-transmitting module layer disposed in sequence, the light-transmitting module layer is disposed on a side, away from the luminescent layer, of the thin film packaging layer, and the photoelectric sensor is disposed in the light-transmitting module layer and located in a light-emitting side direction of the second pixel defining layer. ### Claim 7 (depends on 6) The display panel according to claim 6, wherein the second reflecting layer comprises a first oblique surface and a second oblique surface; and each of the second pixel defining layer is correspondingly provided with two photoelectric sensors, one photoelectric sensor corresponds to the first oblique surface of the first reflecting layer, and the other photoelectric sensor corresponds to the second oblique surface of the second reflecting layer. ### Claim 8 (depends on 4) The display panel according to claim 4, further comprising an electrochromic layer, wherein the electrochromic layer is disposed in the array substrate and is configured for controlling double-sided display of the display panel, and the electrochromic layer is in a transparent state under an equipotential or powered-off condition, and the electrochromic layer is in a light-shielding state in the presence of a voltage difference. ### Claim 9 (depends on 8) The display panel according to claim 8, wherein the display panel is of a top emission structure, and the electrochromic layer is located in the light-emitting side of the second pixel defining layer. ### Claim 10 (depends on 8) The display panel according to claim 8, wherein the display panel is of a bottom emission structure, the luminescent layer comprises a cathode metal layer which is non-transparent, and the electrochromic layer is located in the light-emitting side of the luminescent layer. ### Claim 11 (depends on 10) The display panel according to claim 10, wherein the electrochromic layer is made of any one of iridium oxide, chromium oxide or aluminum oxide. ### Claim 12 (depends on 11) The display panel according to claim 11, wherein the thickness of the electrochromic layer is 1.5 microns to 2 microns. ### Claim 13 (depends on 1) The display panel according to claim 1, wherein the first pixel defining layer is made of a transparent organic material. ### Claim 14 (depends on 1) The display panel according to claim 1, wherein the display panel further comprises a planarization layer and a source-drain layer, the planarization layer is disposed on a side, away from the luminescent layer, of the first pixel defining layer, and the planarization layer is located on the same layer with the source-drain layer and the photoelectric sensor is disposed in the planarization layer. ### Claim 15 (depends on 1) A method for compensation of brightness, wherein the method is applied to the display panel according to claim 1, and the method comprises: acquiring optical waveguide data of the photoelectric sensor; calculating a brightness difference according to the optical waveguide data; and adjusting a driving voltage output by a driving chip according to the brightness difference to perform compensation of brightness on light emitted by the corresponding luminescent layer. ### Claim 16 (depends on 1) A displaying device, comprising the display panel according to claim 1.