# US 11,908,407 B2 · Light emitting display device and compensation method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,407 B2 - Document ID: US11908407B2 - Status: Granted - Kind: B2 - Application number: 17/976,770 - Filed: 2022-10-29 - Published: 2023-07-06 - Granted: 2024-02-20 - Earliest claimed: 2021-12-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Jun Hee Han - Web page: https://patentgrep.com/patent/US11908407B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H10K 59/131: Interconnections, e.g. wiring lines or terminals - G09G 2300/0426: Layout of electrodes and connections - 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 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0257: Reduction of after-image effects - 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 2360/141: the light conveying information used for selecting or modulating the light emitting or modulating element - G09G 2360/142: the light being detected by light detection means within each pixel - H10K 59/13: comprising photosensors that control luminance - 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 A light emitting display device and a compensation method thereof, wherein an optical characteristics detection portion overlapping a signal line is provided in a subpixel, and the optical characteristics detection portion is connected to one of source voltage lines used by the subpixel, whereby optical characteristics of the subpixel can be determined without loss in effective area of an emission portion and to easily compensate for an afterimage of a display panel. ## Claims ### Claim 1 A light emitting display device comprising: a substrate having a plurality of subpixels, and each subpixel comprising an emission portion and a pixel circuit; a signal line and a first source voltage line provided in the pixel circuit, and the signal line and the first source voltage line intersecting each other; a light emitting element provided at the emission portion, and the light emitting element comprising a first electrode, an organic layer, and a second electrode; a first electrode extension portion integral with the first electrode, and the first electrode extension portion extending from the first electrode to overlap with at least a part of the signal line; a connection pattern overlapping with the first electrode extension portion along the signal line; a photovoltaic material provided between the connection pattern and the first electrode extension portion; and a detection pattern spaced apart from the photovoltaic material, wherein one side of the detection pattern is connected to the first electrode extension portion along the signal line, and another side of the detection pattern is connected to the first source voltage line. ### Claim 2 (depends on 1) The light emitting display device according to claim 1, wherein the detection pattern is made of a same material as the first electrode and is spaced apart from both the first electrode and the first electrode extension portion. ### Claim 3 (depends on 2) The light emitting display device according to claim 2, further comprising a bank having a first hole exposing the emission portion between the first electrode and the organic layer, and a second hole exposing the first electrode extension portion on the connection pattern. ### Claim 4 (depends on 1) The light emitting display device according to claim 1, wherein the organic layer contacts upper surfaces of the first electrode and the first electrode extension portion, and does not contact the detection pattern. ### Claim 5 (depends on 1) The light emitting display device according to claim 1, wherein the photovoltaic material comprises one of PTB7, PTB7-Th, PC71BM, PTDB-T, and ITIC. ### Claim 6 (depends on 1) The light emitting display device according to claim 1, wherein an optical characteristics detection portion are defined by the connection pattern and the detection pattern overlapping the signal line, and wherein the pixel circuit comprises: a scan line and a sense line extending to intersect the detection pattern; a switching transistor spaced apart from the optical characteristics detection portion, and the switching transistor overlapping with the scan line; a sensing transistor spaced apart from the optical characteristics detection portion, and the sensing transistor overlapping with the sense line; a driving transistor spaced apart from the optical characteristics detection portion, and the driving transistor comprising a gate electrode connected to the switching transistor and a source electrode connected to the first electrode or the first electrode extension portion together with the sensing transistor; and a second source voltage line supplying driving source voltage to a drain electrode of the driving transistor. ### Claim 7 (depends on 6) The light emitting display device according to claim 6, wherein the first source voltage line supplies reference source voltage and senses voltage of the detection pattern in different periods. ### Claim 8 (depends on 6) The light emitting display device according to claim 6, wherein the scan line and the sense line are located on a same layer as the connection pattern. ### Claim 9 (depends on 8) The light emitting display device according to claim 8, further comprising a passivation film provided between a layer of the connection pattern, the scan line, and the sense line, and a layer of the detection pattern, the passivation film being to protect the switching transistor, the sensing transistor, and the driving transistor. ### Claim 10 (depends on 9) The light emitting display device according to claim 9, wherein the passivation film further comprises a passivation film hole exposing a part of the photovoltaic material, and wherein the photovoltaic material contacts the first electrode extension portion via the passivation film hole. ### Claim 11 (depends on 1) The light emitting display device according to claim 1, wherein the connection pattern, the photovoltaic material, and the detection pattern are provided for each subpixel. ### Claim 12 (depends on 1) The light emitting display device according to claim 1, wherein the connection pattern, the photovoltaic material, and the detection pattern are provided for at least every two subpixels. ### Claim 13 (depends on 1) The light emitting display device according to claim 1, wherein the photovoltaic material receives light emitted from the organic layer, transmits a photovoltaic signal to the connection pattern, and transmits the photovoltaic signal to a driver outside the subpixels through the detection pattern. ### Claim 14 (depends on 1) The light emitting display device according to claim 1, wherein each of the organic layer and the second electrode integrally extends from the emission portion to the photovoltaic material of the pixel circuit. ### Claim 15 (depends on 1) The light emitting display device according to claim 1, wherein the signal line is located closer to the substrate than the connection pattern, the photovoltaic material, and the detection pattern overlapping with each other in a cross-sectional view. ### Claim 16 A compensation method of the light emitting display device comprising: operating a light emitting element of an emission portion in a subpixel to emit light and generating a photovoltaic signal from photovoltaic material of a pixel circuit in the subpixel; transmitting the photovoltaic signal from the photovoltaic material to a first source voltage line via a connection pattern and a detection pattern; and detecting optical characteristics of the subpixel from which the photovoltaic signal has been generated through a driver connected to the first source voltage line. ### Claim 17 (depends on 16) The compensation method according to claim 16, further comprising compensating for a difference between the optical characteristics of the subpixel and a reference value based on the optical characteristics of the subpixel from which the photovoltaic signal is generated and supplying a compensated signal to the first source voltage line or a signal line.