# US 12,765,173 B2 · Light emitting display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,765,173 B2 - Document ID: US12765173B2 - Status: Granted - Kind: B2 - Application number: 17/978,022 - Filed: 2022-10-31 - Published: 2023-07-06 - Granted: 2026-10-13 - Earliest claimed: 2021-12-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Seokho Shim; Yuseok Jung - Web page: https://patentgrep.com/patent/US12765173B2 ## CPC - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A light emitting display apparatus includes a base substrate, a buffer provided in the base substrate, a pixel driving circuit layer provided on the buffer, the pixel driving circuit layer including transistors, a first planarization layer surrounding the pixel driving circuit layer, a hydrogen collection layer surrounding the first planarization layer, a second planarization layer covering the hydrogen collection layer, a light emitting device provided on the second planarization layer and connected to a driving transistor of the transistors, and an encapsulation layer covering the light emitting device. ## Claims ### Claim 1 A light emitting display apparatus, comprising: a base substrate; a buffer provided on the base substrate; a pixel driving circuit layer on the buffer, the pixel driving circuit layer including a driving transistor; a first planarization layer on the pixel driving circuit layer, the first planarization layer including an upper surface and a lateral surface; a hydrogen collection layer on the upper surface and the lateral surface of the first planarization layer; a second planarization layer on the hydrogen collection layer; a light emitting device provided on the second planarization layer and connected to the driving transistor; and an encapsulation layer on the light emitting device, wherein the hydrogen collection layer is included in each of a plurality of pixels and the plurality of pixels are provided in the base substrate, a plurality of first planarization layers are apart from each other and each of the plurality of first planarization layers is included in one pixel, a plurality of hydrogen collection layers are apart from each other and each of the plurality of hydrogen collection layers is included in one pixel, the hydrogen collection layer included in a pixel surrounds a pixel driving circuit layer of the pixel, and wherein the hydrogen collection layer contacts with an upper surface and a lateral surface of the first planarization layer. ### Claim 2 (depends on 1) The light emitting display apparatus of claim 1, wherein the pixel driving circuit layer is surrounded by the buffer and the first planarization layer. ### Claim 3 (depends on 1) The light emitting display apparatus of claim 1, wherein the pixel driving circuit layer is surrounded by the hydrogen collection layer and the buffer. ### Claim 4 (depends on 1) The light emitting display apparatus of claim 1, wherein the first planarization layer includes a first contact hole, and the hydrogen collection layer is connected to the driving transistor through the first contact hole. ### Claim 5 (depends on 4) The light emitting display apparatus of claim 4, comprising a connection electrode connected to an anode electrode included in the light emitting device, wherein the second planarization layer includes a second contact hole, and the connection electrode is provided in the first contact hole and the second contact hole and is connected to the hydrogen collection layer in the first contact hole. ### Claim 6 (depends on 1) The light emitting display apparatus of claim 1, comprising a plurality of pixels on the base substrate, each of the plurality of pixels including the pixel driving circuit layer, wherein each of the plurality of pixels includes the hydrogen collection layer, and a plurality of the hydrogen collection layers respectively included in the plurality of pixels are spaced apart from one another. ### Claim 7 (depends on 1) The light emitting display apparatus of claim 1, comprising a plurality of pixels on the base substrate, each of the plurality of pixels including the pixel driving circuit layer, wherein each of the plurality of pixels includes the hydrogen collection layer, and the hydrogen collection layer included in a pixel extends across a whole area of the pixel and surrounds the pixel driving circuit layer included in the pixel. ### Claim 8 (depends on 1) The light emitting display apparatus of claim 1, comprising a plurality of pixels on the base substrate, wherein the second planarization layer is continuously provided in all of the plurality of pixels on the base substrate. ### Claim 9 (depends on 1) The light emitting display apparatus of claim 1, wherein the second planarization layer is surrounded by the base substrate and the first planarization layer. ### Claim 10 (depends on 9) The light emitting display apparatus of claim 9, wherein the first planarization layer is surrounded by the hydrogen collection layer and the base substrate. ### Claim 11 (depends on 1) The light emitting display apparatus of claim 1, wherein the pixel driving circuit layer comprises an insulation layer covering the driving transistor, and the first planarization layer is surrounded by the hydrogen collection layer and the insulation layer. ### Claim 12 A light emitting display apparatus, comprising: a substrate; a pixel driving circuit layer on the substrate, the pixel driving circuit layer including a driving transistor; a first dielectric layer on the pixel driving circuit layer and surrounding the pixel driving layer in a lateral direction; a conductive hydrogen collection layer on the first dielectric layer and surrounding the dielectric layer in the lateral direction; a first planarization layer on the conductive hydrogen collection layer; and a light emitting element on the first planarization layer, wherein the hydrogen collection layer is included in each of a plurality of pixels and the plurality of pixels are provided in the substrate, a plurality of first planarization layers are apart from each other and each of the plurality of first planarization layers is included in one pixel, a plurality of hydrogen collection layers are apart from each other and each of the plurality of hydrogen collection layers is included in one pixel, the hydrogen collection layer included in a pixel surrounds a pixel driving circuit layer of the pixel, and wherein the hydrogen collection layer contacts with an upper surface and a lateral surface of the first planarization layer. ### Claim 13 (depends on 12) The light emitting display apparatus of claim 12, wherein the first dielectric layer includes a first contact hole, wherein the conductive hydrogen collection layer extends in the first contact hole and in contact with a terminal of the driving transistor through the first contact hole. ### Claim 14 (depends on 12) The light emitting display apparatus of claim 12, wherein the first planarization layer includes a second contact hole, and a terminal of the light emitting element is connected to the conductive hydrogen collection layer through the second contact hole. ### Claim 15 (depends on 12) The light emitting display apparatus of claim 12, wherein the light emitting element include a recess portion that overlaps the second contact hole. ### Claim 16 (depends on 12) The light emitting display apparatus of claim 12, comprising a buffer vertically between the first dielectric layer and the substrate, wherein the conductive hydrogen collection layer meets the buffer vertically between the first dielectric layer and the substrate. ### Claim 17 (depends on 12) The light emitting display apparatus of claim 12, comprising a second dielectric layer on the first dielectric layer, the second dielectric layer including an upper surface and a lateral surface, wherein the conductive hydrogen collection layer includes an upper portion and a lateral portion, the upper portion on the upper surface of the second dielectric layer, and the lateral portion on the lateral surface of the second dielectric layer. ### Claim 18 A light emitting display apparatus, comprising: a substrate; a pixel driving circuit layer on the substrate, the pixel driving circuit layer including a driving transistor; a first dielectric layer on the pixel driving circuit layer, the first dielectric layer including a contact hole that reaches a terminal of the driving transistor; a conductive hydrogen collection layer on the first dielectric layer, the conductive hydrogen collection layer extending in the contact hole and in contact with the terminal of the driving transistor through the contact hole; a first planarization layer on the conductive hydrogen collection layer; and a light emitting element on the first planarization layer, wherein the hydrogen collection layer is included in each of a plurality of pixels and the plurality of pixels are provided in the substrate, a plurality of first planarization layers are apart from each other and each of the plurality of the first planarization layers is included in one pixel, a plurality of hydrogen collection layers are apart from each other and each of the plurality of hydrogen collection layers is included in one pixel, the hydrogen collection layer included in a pixel surrounds a pixel driving circuit layer of the pixel, and wherein the hydrogen collection layer contacts with an upper surface and a lateral surface of the first planarization layer. ### Claim 19 (depends on 18) The light emitting display apparatus of claim 18, wherein the conductive hydrogen collection layer including an upper portion and a lateral portion that extends from the upper portion, the lateral portion surrounding the pixel driving circuit layer from a lateral direction. ### Claim 20 (depends on 18) The light emitting display apparatus of claim 18, wherein the conductive hydrogen collection layer is in the form of an island shape.