# US 12,218,178 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,218,178 B2 - Document ID: US12218178B2 - Status: Granted - Kind: B2 - Application number: 17/481,371 - Filed: 2021-09-22 - Published: 2022-01-06 - Granted: 2025-02-04 - Earliest claimed: 2019-03-29 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Masanobu Ikeda; Hidemasa Yamaguchi - Web page: https://patentgrep.com/patent/US12218178B2 ## CPC - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - H10W 90/00: Package configurations - H10H 20/811: having quantum effect structures or superlattices, e.g. tunnel junctions - H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures - H10H 20/814: having reflecting means, e.g. semiconductor Bragg reflectors - H10H 20/818: within the light-emitting regions - H10H 20/819: characterised by their shape, e.g. curved or truncated substrates - H10H 20/855: Optical field-shaping means, e.g. lenses - H10H 20/856: Reflecting means - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies - H10H 20/821: of the light-emitting regions, e.g. non-planar junctions - H10H 20/833: Transparent materials - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A display device includes a substrate; a plurality of pixels provided on the substrate; and a plurality of inorganic light emitting elements provided on each of the pixels. The inorganic light emitting elements each include a semiconductor substrate having a first face facing the substrate and a second face provided in a convex shape on a side opposite from the first face; and a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in a direction perpendicular to the first face. ## Claims ### Claim 1 A display device comprising: a substrate; a plurality of pixels provided on the substrate; a plurality of inorganic light emitting elements provided on each of the pixels; and a reflective plate provided on the substrate, wherein the inorganic light emitting elements each includes: a semiconductor substrate having a first face facing the substrate and a second face provided in a convex shape on a side opposite from the first face; a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in a direction perpendicular to the first face; protective layers covering the respective semiconductor nanowires; and a contact layer covering the semiconductor nanowires and the protective layers provided on the first face, the contact layer is coupled onto the reflective plate, the protective layers include a transition metal oxide, lower ends of the protective layers are electrically coupled to the reflective plate, and in the contact layer, the protective layers entirely cover vertical sides and lower portions of the respective semiconductor nanowires, the lower portions facing the reflective plate. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the protective layers have a refractive index smaller than a refractive index of the semiconductor nanowires, and the contact layer has a refractive index smaller than the refractive index of the protective layers. ### Claim 3 (depends on 1) The display device according to claim 1, further comprising: an element insulating film provided between the inorganic light emitting elements; and a translucent conductive film covering the inorganic light emitting elements and the element insulating film, the translucent conductive film being electrically coupled to the semiconductor substrate. ### Claim 4 (depends on 3) The display device according to claim 3, wherein an upper face of the element insulating film has a concave shape recessed toward the substrate between the inorganic light emitting elements. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the semiconductor nanowires each have a hexagonal shape in a plan view in the direction perpendicular to the first face and are placed in a triangular grid on the first face. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the semiconductor nanowires each have a hexagonal shape in a plan view in the direction perpendicular to the first face and are placed in a matrix on the first face. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the semiconductor nanowires include a first group of semiconductor nanowires including the semiconductor nanowires provided at a central part of the first face and a second group of semiconductor nanowires including the semiconductor nanowires placed at an outer edge of the semiconductor substrate. ### Claim 8 (depends on 1) The display device according to claim 1, wherein the second face has a curved face curved in a convex shape. ### Claim 9 (depends on 1) The display device according to claim 1, wherein the semiconductor substrate has a trapezoidal shape in cross-section. ### Claim 10 (depends on 1) The display device according to claim 1, further comprising a barrier provided between the inorganic light emitting elements. ### Claim 11 (depends on 1) The display device according to claim 1, wherein the semiconductor nanowires each include an n-type semiconductor extending in the direction perpendicular to the first face; a p-type semiconductor provided at least on a side face of the n-type semiconductor; and an active layer provided between the n-type semiconductor and the p-type semiconductor. ### Claim 12 A display device comprising: a substrate; a plurality of pixels provided on the substrate; a plurality of inorganic light emitting elements provided on each of the pixels; lens members provided on the respective inorganic light emitting elements; and a reflective plate provided on the substrate, wherein the inorganic light emitting elements each includes: a semiconductor substrate having a first face facing the substrate and a second face that is a face on a side opposite from the first face and provided in a concave shape toward the first face; a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in the direction perpendicular to the first face; protective layers covering the respective semiconductor nanowires; and a contact layer covering the semiconductor nanowires and the protective layers provided on the first face, the lens members are provided on the second face, the contact layer is coupled onto the reflective plate, the protective layers include a transition metal oxide, lower ends of the protective layers are electrically coupled to the reflective plate, and in the contact layer, the protective layers entirely cover vertical sides and lower portions of the respective semiconductor nanowires, the lower portions facing the reflective plate.