# US 12,604,621 B2 · Display panel and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,621 B2 - Document ID: US12604621B2 - Status: Granted - Kind: B2 - Application number: 18/032,281 - Filed: 2022-06-21 - Published: 2025-04-17 - Granted: 2026-04-14 - Earliest claimed: 2022-06-21 - Assignees: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd. - Inventors: Ning Liu; Ming Wang; Bin Zhou - Web page: https://patentgrep.com/patent/US12604621B2 ## CPC - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/00: Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - H10K 59/126: Shielding, e.g. light-blocking means over the TFTs - H10K 59/1315: {comprising structures specially adapted for lowering the resistance} - H10K 59/80516: {combined with auxiliary electrodes, e.g. ITO layer combined with metal lines} - H10K 59/80522: {combined with auxiliary electrodes} - H10K 2102/351: {Thickness} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract Provided is a display panel, including: a substrate; an auxiliary electrode on a side of the substrate; an insulating layer on a side, distal from the substrate, of the auxiliary electrode and a first via running through the insulating layer, the first via exposing the auxiliary electrode and being in an undercut shape; an anode layer on a side, distal from the substrate, of the insulating layer; a light emitting layer on a side, distal from the substrate, of the anode layer, the light emitting layer being broken at an opening in a side, distal from the substrate, of the first via into a first part and a second part; and a cathode layer on a side, distal from the substrate, of the light emitting layer, the cathode layer being coupled with the auxiliary electrode along a side wall of the first part of the light emitting layer. ## Claims ### Claim 1 A display panel, comprising: a substrate; an auxiliary electrode on a side of the substrate; an insulating layer on a side, distal from the substrate, of the auxiliary electrode and a first via running through the insulating layer, the first via exposing the auxiliary electrode and being in an undercut shape; an anode layer on a side, distal from the substrate, of the insulating layer; a light emitting layer on a side, distal from the substrate, of the anode layer, the light emitting layer being broken at an opening in a side, distal from the substrate, of the first via into a first part and a second part, the first part being outside the first via and on the side, distal from the substrate, of the insulating layer, and the second part being inside the first via and on a side, proximal to the substrate, of the insulating layer; and a cathode layer on a side, distal from the substrate, of the light emitting layer, the cathode layer being coupled with the auxiliary electrode along a side wall of the first part of the light emitting layer, and the coupled part of the cathode layer and the auxiliary electrode being on a side, proximal to the substrate, of the anode layer. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the insulating layer comprises a first insulating layer and a second insulating layer that are laminated in sequence along a direction away from the substrate; the first via in the undercut shape comprises a first sub-via running through the first insulating layer and a second sub-via running through the second insulating layer, the first sub-via and the second sub-via being communicated in sequence along the direction away from the substrate; and an orthographic projection of an opening in a side, proximal to the substrate, of the first sub-via on the substrate and an orthographic projection of an opening in a side, proximal to the substrate, of the second sub-via on the substrate are both within an orthographic projection of an opening in a side, distal from the substrate, of the first sub-via on the substrate. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein a thickness of the first insulating layer is greater than a thickness of the anode layer and less than or equal to a thickness of the second insulating layer. ### Claim 4 (depends on 3) The display panel according to claim 3, wherein the thickness of the first insulating layer is 0.5 times to 1 time the thickness of the second insulating layer. ### Claim 5 (depends on 2) The display panel according to claim 2, wherein a slope of a side wall of the first sub-via is larger than a slope of a side wall of the second sub-via. ### Claim 6 (depends on 5) The display panel according to claim 5, wherein, along a direction perpendicular to the substrate, a cross-section of the first sub-via is of an inverted trapezoid shape, and a cross-section of the second sub-via is of a rectangle shape. ### Claim 7 (depends on 2) The display panel according to claim 2, wherein the first insulating layer comprises a passivation layer, and the second insulating layer comprises a resin material layer. ### Claim 8 (depends on 1) The display panel according to claim 1, further comprising: one first via running through the insulating layer; or, a plurality of first vias running through the insulating layer, wherein a direction in which the plurality of first vias are arranged at intervals is a direction parallel to a bearing surface of the substrate. ### Claim 9 (depends on 1) The display panel according to claim 1, further comprising: a first conductive layer between the insulating layer and the light emitting layer, the cathode layer being coupled with the first conductive layer along the side wall of the first part of the light emitting layer, the first conductive layer being coupled with the auxiliary electrode along a side wall of the first via and a bottom of the first via, and the coupled part of the cathode layer and the first conductive layer being on the side, proximal to the substrate, of the anode layer. ### Claim 10 (depends on 9) The display panel according to claim 9, wherein the anode layer comprises a second conductive layer, a reflective anode layer, and a third conductive layer that are laminated in sequence along the direction away from the substrate; wherein the second conductive layer and the first conductive layer are disposed on the same layer and spaced apart from each other. ### Claim 11 (depends on 10) The display panel according to claim 10, further comprising: a transistor between the substrate and the insulating layer, the transistor being provided with an active layer, a gate insulating layer, a gate metal layer, an inter-layer dielectric layer, and a source-drain metal layer that are laminated in sequence, the source-drain metal layer and the auxiliary electrode being disposed on the same layer, and the source-drain metal layer comprising a first metal part and a second metal part that are disposed on the same layer and spaced apart from each other; a second via running through the insulating layer and exposing the second metal part, the second conductive layer in the anode layer being coupled with the second metal part by the second via; and a third via running through the inter-layer dielectric layer and exposing the active layer, the first metal part and the second metal part being both coupled with the active layer by the third via. ### Claim 12 (depends on 11) The display panel according to claim 11, wherein a width of the first via is greater than a width of the second via. ### Claim 13 (depends on 11) The display panel according to claim 11, wherein the active layer, the gate insulating layer, the gate metal layer, the inter-layer dielectric layer, and the source-drain metal layer are laminated in sequence along the direction away from the substrate; and the display panel further comprises: a light shielding layer and a buffering layer that are laminated in sequence along the direction away from the substrate between the substrate and the transistor; and a fourth via running through the inter-layer dielectric layer and the buffering layer and exposing the light shielding layer, the second metal part being coupled with the light shielding layer by the fourth via. ### Claim 14 (depends on 13) The display panel according to claim 13, wherein the display panel further comprises a pixel defining layer disposed between the insulating layer and the light emitting layer, and the substrate comprises a first region and a second region, wherein the first region and the second region are defined by the pixel defining layer, the second region at least partially surrounding the first region; the light shielding layer, the transistor, the anode layer, the pixel defining layer, the second via, the third via, and the fourth via are all disposed in the first region; the auxiliary electrode, the first conductive layer, and the first via are all disposed in the second region; the buffering layer, the inter-layer dielectric layer, the insulating layer, the light emitting layer, and the cathode layer are all disposed in the first region and the second region, and a thickness of a part of the insulating layer disposed in the first region is greater than a thickness of a part of the insulating layer disposed in the second region; and the anode layer, the light emitting layer, and the cathode layer disposed in the first region form an organic light emitting diode. ### Claim 15 A display device, comprising: a power component, and a display panel; wherein the power component is electrically connected to the display panel, and is configured to supply power to the display panel; and the display panel comprises: a substrate; an auxiliary electrode on a side of the substrate; an insulating layer on a side, distal from the substrate, of the auxiliary electrode and a first via running through the insulating layer, the first via exposing the auxiliary electrode and being in an undercut shape; an anode layer on a side, distal from the substrate, of the insulating layer; a light emitting layer on a side, distal from the substrate, of the anode layer, the light emitting layer being broken at an opening in a side, distal from the substrate, of the first via into a first part and a second part, the first part being outside the first via and on the side, distal from the substrate, of the insulating layer, and the second part being inside the first via and on a side, proximal to the substrate, of the insulating layer; and a cathode layer on a side, distal from the substrate, of the light emitting layer, the cathode layer being coupled with the auxiliary electrode along a side wall of the first part of the light emitting layer, and the coupled part of the cathode layer and the auxiliary electrode being on a side, proximal to the substrate, of the anode layer. ### Claim 16 (depends on 15) The display device according to claim 15, wherein the insulating layer comprises a first insulating layer and a second insulating layer that are laminated in sequence along a direction away from the substrate; the first via in the undercut shape comprises a first sub-via running through the first insulating layer and a second sub-via running through the second insulating layer, the first sub-via and the second sub-via being communicated in sequence along the direction away from the substrate; and an orthographic projection of an opening in a side, proximal to the substrate, of the first sub-via on the substrate and an orthographic projection of an opening in a side, proximal to the substrate, of the second sub-via on the substrate are both within an orthographic projection of an opening in a side, distal from the substrate, of the first sub-via on the substrate. ### Claim 17 (depends on 16) The display device according to claim 16, wherein a thickness of the first insulating layer is greater than a thickness of the anode layer and less than or equal to a thickness of the second insulating layer. ### Claim 18 (depends on 17) The display device according to claim 17, wherein the thickness of the first insulating layer is 0.5 times to 1 time the thickness of the second insulating layer. ### Claim 19 (depends on 16) The display device according to claim 16, wherein a slope of a side wall of the first sub-via is larger than a slope of a side wall of the second sub-via. ### Claim 20 (depends on 19) The display device according to claim 19, wherein, along a direction perpendicular to the substrate, a cross-section of the first sub-via is of an inverted trapezoid shape, and a cross-section of the second sub-via is of a rectangle shape.