# US 2025/0098487 A1 · Display Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0098487 A1 - Document ID: US20250098487A1 - Status: Published application - Kind: A1 - Application number: 18/767,875 - Filed: 2024-07-09 - Published: 2025-03-20 - Earliest claimed: 2023-09-18 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Yuseok Jung - Web page: https://patentgrep.com/patent/US20250098487A1 ## CPC - H10K 59/873: {Encapsulations} - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display device includes a substrate including an active area and a non-active area which extends from the active area, a light emitting diode which is disposed on the substrate and includes an anode, a light emitting layer, and a cathode, a dam disposed on the substrate in the non-active area and a step relief pattern disposed in a part of a surface of the dam. The dam includes a first insulating layer and a second insulating layer on the first insulating layer, and the step relief pattern is disposed to enclose a side surface of the first insulating layer and a lower portion of a side surface of the second insulating layer. ## Claims ### Claim 1 A display device, comprising: a substrate including an active area and a non-active area that extends from the active area; a light emitting diode on the substrate, the light emitting diode including an anode, a light emitting layer, and a cathode; a dam in the non-active area of the substrate; and a step relief pattern in a part of a surface of the dam, wherein the dam includes a first insulating layer and a second insulating layer on the first insulating layer, and the step relief pattern encloses a side surface of the first insulating layer and a lower portion of a side surface of the second insulating layer. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the second insulating layer exposes a part of a top surface of the first insulating layer. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the step relief pattern is in contact with the part of the top surface of the first insulating layer exposed by the second insulating layer. ### Claim 4 (depends on 1) The display device according to claim 1, wherein an end of the step relief pattern is on a same plane as an end of the first insulating layer. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the step relief pattern comprises a same material as the anode. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the step relief pattern comprises a different conductive material than the anode. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the step relief pattern comprises titanium. ### Claim 8 (depends on 1) The display device according to claim 1, further comprising: a bank and a spacer in the active area of the substrate, wherein the dam further includes: a third insulating layer on the second insulating layer, the third insulating layer comprising a same material as the bank, and a fourth insulating layer on the third insulating layer, the fourth insulating layer comprising a same material as the spacer. ### Claim 9 (depends on 1) The display device according to claim 1, further comprising: a metal layer between the first insulating layer and the second insulating layer. ### Claim 10 (depends on 9) The display device according to claim 9, further comprising: a connection electrode below the light emitting diode and electrically connected to the anode, wherein the metal layer is on a same layer as the connection electrode and comprises a same material as the connection electrode. ### Claim 11 (depends on 9) The display device according to claim 9, wherein the metal layer comprises titanium. ### Claim 12 (depends on 1) The display device according to claim 1, further comprising: a capping layer on the light emitting diode, wherein an end of the light emitting layer, an end of the cathode, and an end of the capping layer are on a same plane as an end of the substrate. ### Claim 13 (depends on 1) The display device according to claim 1, further comprising: a plurality of structures at an inside and an outside of the dam, wherein the plurality of structures comprise an undercut shape. ### Claim 14 (depends on 13) The display device according to claim 13, wherein each of the plurality of structures includes an upper layer and a lower layer, and wherein an area of a bottom surface of the upper layer is larger than an area of a top surface of the lower layer. ### Claim 15 (depends on 14) The display device according to claim 14, wherein the upper layer and the lower layer comprise different materials. ### Claim 16 (depends on 15) The display device according to claim 15, wherein the upper layer comprises a conductive material, and the lower layer comprises an insulating material. ### Claim 17 (depends on 13) The display device according to claim 13, wherein each of the plurality of structures includes a first layer, a second layer, and a third layer, and wherein an area of a bottom surface of the third layer is larger than an area of a top surface of the second layer. ### Claim 18 (depends on 17) The display device according to claim 17, wherein the third layer comprises a conductive material, and the first layer and the second layer comprise insulating materials. ### Claim 19 (depends on 17) The display device according to claim 17, wherein the third layer comprises a same material as the anode, and wherein the first layer and the second layer comprise insulating materials. ### Claim 20 (depends on 13) The display device according to claim 13, further comprising: a capping layer on the light emitting diode, wherein the light emitting layer, the cathode, and the capping layer are spaced apart from each other through the plurality of structures.