# US 12,765,137 B2 · Light-emitting device and projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,765,137 B2 - Document ID: US12765137B2 - Status: Granted - Kind: B2 - Application number: 17/876,486 - Filed: 2022-07-28 - Published: 2023-02-02 - Granted: 2026-10-13 - Earliest claimed: 2021-07-29 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Masaaki Aota; Yoji Kitano - Web page: https://patentgrep.com/patent/US12765137B2 ## CPC - H10H 20/855: Optical field-shaping means, e.g. lenses - G03B 21/006: {using LCD's} - G03B 21/2033: {LED or laser light sources} - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10H 20/825: containing nitrogen, e.g. GaN - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A light-emitting device includes a substrate, a laminated structure provided at the substrate, and a conductive layer provided at the laminated structure and configured to apply an electric current to the laminated structure. The laminated structure is provided between the substrate and the conductive layer, and includes a first semiconductor layer of a first conductive type, a second semiconductor layer of a second conductive type different from the first conductive type, and a light-emitting layer provided between the first semiconductor layer and the second semiconductor layer. The conductive layer includes a plurality of wire portions extending in a direction orthogonal to a lamination direction of the laminated structure, and is configured to polarize light generated at the light-emitting layer, and an electric current is applied to the light-emitting layer via the plurality of wire portions. ## Claims ### Claim 1 A light-emitting device, comprising: a substrate; a laminated structure provided at the substrate; a conductive layer provided at the laminated structure and configured to apply an electric current to the laminated structure; an insulating layer provided at the substrate and in contact with the conductive layer; and a first electrode provided between the laminated structure and the conductive layer, wherein the laminated structure is provided between the substrate and the conductive layer, and includes: a first semiconductor layer of a first conductive type; a second semiconductor layer of a second conductive type different from the first conductive type; and a light-emitting layer provided between the first semiconductor layer and the second semiconductor layer, the conductive layer includes a plurality of wire portions extending in a direction orthogonal to a lamination direction of the laminated structure, and is configured to polarize light generated at the light-emitting layer, an electric current is applied to the light-emitting layer via the plurality of wire portions, each of the plurality of wire portions is in contact with the first electrode, and as viewed from the lamination direction, the entire insulating layer is provided in a region other than a region where the conductive layer and the laminated structure are provided. ### Claim 2 (depends on 1) The light-emitting device according to claim 1, wherein the light generated at the light-emitting layer passes through the first electrode, and is emitted, and an electric current is applied to the light-emitting layer via the first electrode. ### Claim 3 (depends on 2) The light-emitting device according to claim 2, comprising a second electrode provided at the conductive layer on a side opposite to the first electrode and coupled to the plurality of wire portions. ### Claim 4 (depends on 3) The light-emitting device according to claim 3, wherein the second electrode is a transparent electrode that is transparent with respect to the light generated at the light-emitting layer, and a resistivity of each of the plurality of wire portions is lower than a resistivity of the second electrode. ### Claim 5 (depends on 1) The light-emitting device according to claim 1, wherein the laminated structure includes a photonic crystal structure configured to confine, in a direction orthogonal to the lamination direction, the light generated at the light-emitting layer and emit the light in the lamination direction. ### Claim 6 (depends on 5) The light-emitting device according to claim 5, wherein in the light emitted from the photonic crystal structure in the lamination direction, a ratio of light having an electric field oscillating in a direction orthogonal to an extension direction of each of the plurality of wire portions is greater than a ratio of light having an electric field oscillating in the extension direction of each of the plurality of wire portions. ### Claim 7 (depends on 5) The light-emitting device according to claim 5, wherein the second semiconductor layer forms the photonic crystal structure. ### Claim 8 (depends on 5) The light-emitting device according to claim 5, wherein the laminated structure includes a plurality of column portions, the first semiconductor layer, the second semiconductor layer, and the light-emitting layer form the plurality of column portions, and the plurality of column portions form the photonic crystal structure. ### Claim 9 (depends on 8) The light-emitting device according to claim 8, wherein as viewed from the lamination direction, the plurality of column portions overlap with at least one of the plurality of wire portions. ### Claim 10 (depends on 1) The light-emitting device according to claim 1, wherein the conductive layer includes a coupling portion configured to couple adjacent wire portions of the plurality of wire portions to each other. ### Claim 11 (depends on 1) The light-emitting device according to claim 1, wherein each of the plurality of wire portions includes: a first layer; and a second layer provided between the first layer and the laminated structure, and having a higher melting point than the first layer. ### Claim 12 (depends on 1) A projector comprising the light-emitting device according to claim 1. ### Claim 13 A light-emitting device, comprising: a substrate; a laminated structure provided at the substrate; a conductive layer provided at the laminated structure and configured to apply an electric current to the laminated structure; a first electrode provided between the laminated structure and the conductive layer; and a second electrode provided at the conductive layer on a side opposite to the first electrode, wherein the first electrode has a lower resistivity and a smaller thickness than the second electrode, the laminated structure is provided between the substrate and the conductive layer, and includes: a first semiconductor layer of a first conductive type; a second semiconductor layer of a second conductive type different from the first conductive type; and a light-emitting layer provided between the first semiconductor layer and the second semiconductor layer, the conductive layer includes a plurality of wire portions extending in a direction orthogonal to a lamination direction of the laminated structure, and is configured to polarize light generated at the light-emitting layer, an electric current is applied to the light-emitting layer via the plurality of wire portions, and the second electrode is coupled to and provided over each of the plurality of wire portions.