# US 2025/0380577 A1 · Display device and method of manufacturing display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0380577 A1 - Document ID: US20250380577A1 - Status: Published application - Kind: A1 - Application number: 19/231,716 - Filed: 2025-06-09 - Published: 2025-12-11 - Earliest claimed: 2024-06-10 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Sho YANAGISAWA; Jun HANARI; Hidekazu MIYAKE - Web page: https://patentgrep.com/patent/US20250380577A1 ## CPC - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/1201: {Manufacture or treatment} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract According to one embodiment, a display device includes first and second subpixels arrayed in a first direction, a rib layer having first and second pixel apertures, and a partition between the subpixels. The partition is split into first and second partitions by a slit extending in a second direction. The first partition includes a lower portion having first and second side surfaces and an upper portion having first and second end portions. The first end portion protrudes from the first side surface. The second end portion does not protrude from the second side surface or protrudes from the second side surface with a protrusion length shorter than a protrusion length of the first end portion from the first side surface. ## Claims ### Claim 1 A display device, comprising: a first subpixel and a second subpixel that are arrayed in a first direction; a rib layer having a first pixel aperture located in the first subpixel and a second pixel aperture located in the second subpixel; a partition located between the first subpixel and the second subpixel and provided above the rib layer, wherein the partition is split into a first partition on the first subpixel side and a second partition on the second subpixel side by a slit extending in a second direction intersecting the first direction, the first partition comprises: a lower portion having a first side surface on the first subpixel side and a second side surface on the slit side; and an upper portion having a first end portion on the first subpixel side and a second end portion on the slit side and provided on the lower portion, the first end portion protrudes from the first side surface, and the second end portion does not protrude from the second side surface or protrudes from the second side surface with a protrusion length shorter than a protrusion length of the first end portion from the first side surface. ### Claim 2 (depends on 1) The display device of claim 1, wherein the lower portion of the first partition comprises: a stem layer having the first side surface and the second side surface; and a bottom layer located between the rib layer and the stem layer and having a third end portion on the first subpixel side and a fourth end portion on the slit side, and the third end portion protrudes from the first side surface. ### Claim 3 (depends on 2) The display device of claim 2, wherein the fourth end portion dose not protrude from the second side surface. ### Claim 4 (depends on 2) The display device of claim 2, wherein the fourth end portion protrudes from the second side surface. ### Claim 5 (depends on 4) The display device of claim 4, wherein a protrusion length of the fourth end portion from the second side surface is shorter than a protrusion length of the third end portion from the first side surface. ### Claim 6 (depends on 4) The display device of claim 4, wherein the fourth end portion is thinner than the third end portion. ### Claim 7 (depends on 1) The display device of claim 1, wherein the first subpixel comprises: a first lower electrode overlapping the first pixel aperture and having a peripheral portion covered with the rib layer; a first organic layer covering the first lower electrode through the first pixel aperture and emitting light according to applied voltage; and a first upper electrode covering the first organic layer and contacting the lower portion of the first partition. ### Claim 8 (depends on 7) The display device of claim 7, further comprising: a first sealing layer formed of an inorganic insulating material and provided above the first upper electrode, and the first sealing layer covers the first side surface and the first end portion. ### Claim 9 (depends on 8) The display device of claim 8, wherein an end portion of the first sealing layer is located above the first partition. ### Claim 10 (depends on 9) The display device of claim 9, further comprising: a resin layer covering the first sealing layer, wherein the second side surface and the second end portion are covered with the resin layer. ### Claim 11 (depends on 10) The display device of claim 10, wherein the resin layer contacts the rib layer in the slit. ### Claim 12 (depends on 7) The display device of claim 7, wherein the second subpixel comprises: a second lower electrode overlapping the second pixel aperture and having a peripheral portion covered with the rib layer; a second organic layer covering the second lower electrode through the second pixel aperture and emitting light according to applied voltage; and a second upper electrode covering the second organic layer and contacting the second partition. ### Claim 13 (depends on 12) The display device of claim 12, wherein the slit does not overlap the first lower electrode and the second lower electrode. ### Claim 14 A display device manufacturing method, comprising: forming a first lower electrode and a second lower electrode respectively in a first subpixel and a second subpixel that are arrayed in a first direction; forming a rib layer covering the first lower electrode and the second lower electrode; forming a first partition on the first subpixel side and a second partition on the second subpixel side between the first subpixel and the second subpixel, the first partition and the second partition each having a lower portion provided above the rib layer and an upper portion having end portions respectively protruding from side surfaces of the lower portion and split by a slit extending in a second direction intersecting the first direction; and removing an end portion of the upper portion along the slit on at least one of the first partition and the second partition. ### Claim 15 (depends on 14) The display device manufacturing method of claim 14, wherein the lower portion of the first partition having a first side surface on the first subpixel side and a second side surface on the slit side, the upper portion of the first partition has a first end portion on the first subpixel side and a second end portion on the slit side, and the removing process includes: providing a first resist covering the first end portion and making the second end portion exposed; and removing at least part of the second end portion exposed from the first resist by a first etching. ### Claim 16 (depends on 15) The display device manufacturing method of claim 15, wherein the lower portion of the first partition comprises: a stem layer having the first side surface and the second side surface; a bottom layer located between the rib layer and the stem layer and having a third end portion protruding from the first side surface and a fourth end portion protruding from the second side surface, and the removing process includes: removing the first resist after the first etching; providing a second resist covering the third end portion and making the fourth end portion exposed, and removing at least part of the fourth end portion exposed from the second resist by a second etching. ### Claim 17 (depends on 15) The display device manufacturing method of claim 15, wherein the first resist has an aperture overlapping the first lower electrode and the second electrode, and a first pixel aperture overlapping the first lower electrode and a second pixel aperture overlapping the second lower electrode are formed by removing the rib layer exposed through the aperture by the first etching. ### Claim 18 (depends on 15) The display device manufacturing method of claim 15, wherein the rib layer covers a conductive pad provided outside a display area including the first subpixel and the second subpixel, the first resist has an aperture overlapping the pad, and the first etching forms a terminal aperture overlapping the pad in the rib layer by removing the rib layer exposed through the aperture. ### Claim 19 (depends on 14) The display device manufacturing method of claim 14, further comprising: forming a first organic layer emitting light according to applied voltage in the first subpixel; forming a first upper electrode covering the first organic layer and contacting the lower portion of the first partition; and forming a first sealing layer formed of an inorganic insulating material above the first upper electrode. ### Claim 20 (depends on 19) The display device manufacturing method of claim 19, further comprising: forming a resin layer covering the first sealing layer and contacting the rib layer in the slit.