# US 12,004,375 B2 · Pixel defining layer, organic light-emitting diode display panel, and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,375 B2 - Document ID: US12004375B2 - Status: Granted - Kind: B2 - Application number: 17/280,298 - Filed: 2020-06-05 - Published: 2022-02-03 - Granted: 2024-06-04 - Earliest claimed: 2019-06-14 - Assignees: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Biao Xu; Hungchieh Hu; Heng Yang - Web page: https://patentgrep.com/patent/US12004375B2 ## CPC - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/878: {comprising reflective means} - H10K 59/1201: {Manufacture or treatment} - H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers} - H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers} - H10K 2102/3026: {Top emission} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract Provided is a pixel defining layer of an organic light-emitting diode display panel. The pixel defining layer includes: an insulating transparent cladding layer; and a reflecting layer in the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel. Organic light-emitting diode display panels and methods for manufacturing an organic light-emitting diode display panel are also provided. ## Claims ### Claim 1 A pixel defining layer of an organic light-emitting diode display panel, comprising: an insulating transparent cladding layer; and a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel; wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel. ### Claim 2 (depends on 1) The pixel defining layer according to claim 1, wherein the thickness of the reflecting layer ranges from 0.5 μm to 1.4 μm, and the thickness of the light-emitting layer is less than 0.4 μm. ### Claim 3 (depends on 1) The pixel defining layer according to claim 1, wherein a side of the reflecting layer proximal to the light-emitting layer surrounded by the reflecting layer is inclined, and an area of a side of the reflecting layer distal from the substrate of the organic light-emitting diode display panel is less than an area of a side of the reflecting layer proximal to the substrate. ### Claim 4 (depends on 3) The pixel defining layer according to claim 3, wherein an angle between the inclined side surface of the reflecting layer and the substrate of the organic light-emitting diode display panel is greater than or equal to 15° and less than or equal to 30°. ### Claim 5 (depends on 3) The pixel defining layer according to claim 3, wherein a reflectivity of the reflecting layer is greater than 90%. ### Claim 6 (depends on 1) The pixel defining layer according to claim 1, wherein the reflecting layer is a metal layer. ### Claim 7 (depends on 6) The pixel defining layer according to claim 6, wherein a material of the metal layer is Ag or Al. ### Claim 8 (depends on 1) The pixel defining layer according to claim 1, wherein the transparent cladding layer is provided with a plurality of grooves, wherein a side of the groove proximal to the light-emitting layer surrounded by the groove is inclined, and an area of a side of the groove distal from the substrate of the organic light-emitting diode display panel is greater than an area of a side of the groove proximal to the substrate. ### Claim 9 (depends on 8) The pixel defining layer according to claim 8, wherein an angle between a side of the groove and the substrate is greater than or equal to 25° and less than or equal to 30°. ### Claim 10 (depends on 8) The pixel defining layer according to claim 8, wherein a transparency of the transparent cladding layer is greater than 90%. ### Claim 11 An organic light-emitting diode display panel, comprising: a substrate; a pixel defining layer; and a device layer in a groove defined by the pixel defining layer; wherein the pixel defining layer comprises: an insulating transparent cladding layer; and a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel; wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel. ### Claim 12 (depends on 11) The organic light-emitting diode display panel according to claim 11, wherein the device layer comprises: a reflecting electrode; a light-emitting layer on the reflecting electrode; and a transparent electrode on the light-emitting layer. ### Claim 13 (depends on 12) The organic light-emitting diode display panel according to claim 12, wherein a material of the reflecting electrode is Ag or an ITO—Ag—ITO alloy; and a material of the transparent electrode is one of Ag, Al, a Mg—Ag alloy, and a Mg—Al alloy. ### Claim 14 A method for manufacturing an organic light-emitting diode display panel, wherein the organic light-emitting diode display panel comprises: a substrate, a pixel defining layer, and a device layer in a groove defined by the pixel defining layer; wherein the pixel defining layer comprises: an insulating transparent cladding layer, and a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel; wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel, the method comprises: forming a pixel defining layer on the substrate; and forming a device layer in a groove defined by the pixel defining layer. ### Claim 15 (depends on 14) The method according to claim 14, wherein forming the device layer in the groove defined by the pixel defining layer comprises: forming, before the pixel defining layer is manufactured, a first metal layer on the substrate; forming the reflecting electrode by patterning the first metal layer; and forming the device layer by forming the light-emitting layer and the transparent electrode sequentially on the reflecting electrode. ### Claim 16 (depends on 15) The method according to claim 15, wherein forming the pixel defining layer on the substrate comprises: forming a second metal layer to cover the reflecting electrode and the substrate; forming the reflecting layer by patterning the second metal layer, wherein the reflecting layer surrounds the exposed reflecting electrode and is electrically isolated from the reflecting electrode; forming a polyimide layer to cover the reflecting layer and the reflecting electrode; and forming the transparent cladding layer by patterning the polyimide layer, wherein the pixel defining layer is formed by the transparent cladding layer and the reflecting layer, and the pixel defining layer covers the reflecting electrode and surrounds the exposed reflecting electrode. ### Claim 17 (depends on 16) The method according to claim 16, wherein after forming the reflecting electrode by patterning the first metal layer and before forming the second metal layer to cover the reflecting electrode and the substrate, the method further comprises: forming an inorganic thin film layer to cover the reflecting electrode and the exposed substrate. ### Claim 18 (depends on 17) The method according to claim 17, wherein forming the second metal layer to cover the reflecting electrode and the substrate and forming the reflecting layer by patterning the second metal layer comprises: forming the second metal layer to cover the inorganic thin film layer; and exposing the reflecting electrode by patterning the second metal layer, and forming the reflecting layer on the non-patterned inorganic thin film layer.