# US 2026/0090232 A1 · Display device and method for producing display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0090232 A1 - Document ID: US20260090232A1 - Status: Published application - Kind: A1 - Application number: 19/111,664 - Filed: 2022-09-26 - Published: 2026-03-26 - Earliest claimed: 2022-09-26 - Assignees: Sharp Display Technology Corporation - Applicants: Sharp Display Technology Corporation - Inventors: YUSUKE SAKAKIBARA - Web page: https://patentgrep.com/patent/US20260090232A1 ## CPC - H10K 59/771: {Integrated devices comprising a common active layer} - G09F 9/30: in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) - H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources - H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces - H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} - H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers - H10K 50/00: Organic light-emitting devices (integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36) - H10K 59/00: Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 - H10K 59/1201: {Manufacture or treatment} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract The display device includes a substrate, a plurality of light-emitting elements including a quantum dot layer including a plurality of quantum dots and a first inorganic material with which spaces between the plurality of quantum dots are filled, and an inorganic layer. The inorganic layer is located between the at least two light-emitting elements. Furthermore, the inorganic layer contains a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator. ## Claims ### Claim 1 A display device comprising: a substrate; a plurality of light-emitting elements on the substrate, the plurality of light-emitting elements including a first electrode, a second electrode, and a quantum dot layer located between the first electrode and the second electrode and including a plurality of quantum dots and a first inorganic material with which spaces between the plurality of quantum dots are filled; and an inorganic layer located between at least two of the light-emitting elements and including a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator. ### Claim 2 (depends on 1) The display device according to claim 1, wherein part of the inorganic layer is located between the first electrode and the second electrode of the light-emitting element. ### Claim 3 (depends on 1) The display device according to claim 1, wherein each of the plurality of light-emitting elements further includes a charge transport layer located at least one of between the first electrode and the quantum dot layer or between the second electrode and the quantum dot layer, the inorganic layer is in contact with at least one of the charge transport layers, and a band gap of the second inorganic material is equal to or more than a band gap of the charge transport layer with which the inorganic layer is in contact. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the band gap of the second inorganic material has a difference of 0.2 eV or more from the band gap of the charge transport layer with which the inorganic layer is in contact. ### Claim 5 (depends on 3) The display device according to claim 3, wherein the charge transport layer includes a first charge transport layer located between the first electrode and the quantum dot layer, and a second charge transport layer located between the second electrode and the quantum dot layer, and at least part of the inorganic layer is located between the first charge transport layer and the second charge transport layer. ### Claim 6 (depends on 5) The display device according to claim 5, further comprising: banks partitioning the plurality of light-emitting elements, wherein at least part of the inorganic layer is located between one of the charge transport layers and the bank. ### Claim 7 (depends on 1) The display device according to claim 1, wherein at least part of the inorganic layer overlaps a periphery of the quantum dot layer in a plan view of the substrate. ### Claim 8 (depends on 1) The display device according to claim 1, wherein at least part of the inorganic layer overlaps the first electrode in a plan view of the substrate. ### Claim 9 (depends on 1) The display device according to claim 1, wherein part of the inorganic layer overlaps the quantum dot layer in a plan view of the substrate. ### Claim 10 (depends on 9) The display device according to claim 9, wherein a thickness of the inorganic layer in contact with the quantum dot layer is smaller than a thickness of the inorganic layer overlapping a periphery of the quantum dot layer in a plan view of the substrate. ### Claim 11 (depends on 1) The display device according to claim 1, wherein the inorganic layer is formed only at a position overlapping a periphery of the quantum dot layer in a plan view of the substrate. ### Claim 12 (depends on 1) The display device according to claim 1, wherein the first inorganic material and the second inorganic material include the same inorganic material. ### Claim 13 (depends on 1) The display device according to claim 1, wherein the first inorganic material and the second inorganic material include zinc sulfide or zinc magnesium sulfide. ### Claim 14 (depends on 1) The display device according to claim 1, wherein the inorganic layer includes aluminum oxide. ### Claim 15 (depends on 1) The display device according to claim 1, wherein a film thickness of the inorganic layer is 1 nm or more and 30 nm or less. ### Claim 16 (depends on 15) The display device according to claim 15, wherein the film thickness of the inorganic layer is 1 nm or more and 2 nm or less. ### Claim 17 A manufacturing method of a display device comprising: providing a substrate; forming a plurality of light-emitting elements including forming a plurality of first electrodes on the substrate, forming a plurality of quantum dot layers each including a plurality of quantum dots and a first inorganic material with which spaces between the plurality of quantum dots are filled at a position overlapping a respective one of the first electrodes in a plan view of the substrate, and forming at least one second electrode at a position overlapping a respective one of the first electrodes in a plan view of the substrate; and forming an inorganic layer located between at least two of the light-emitting elements and including a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator. ### Claim 18 (depends on 17) The manufacturing method of a display device according to claim 17, wherein the forming the inorganic layer includes a film formation of the inorganic layer including the second inorganic material at a position overlapping at least one of the plurality of first electrodes in a plan view of the substrate, and the forming the quantum dot layer includes a film formation of a quantum dot material layer including the first inorganic material and the plurality of quantum dots on the inorganic layer. ### Claim 19 (depends on 18) The manufacturing method of a display device according to claim 18, wherein the forming the plurality of light-emitting elements further includes forming a charge transport layer on at least each of the plurality of first electrodes, and the forming the inorganic layer includes a film formation of the inorganic layer on the charge transport layer. ### Claim at position 20 20-22. (canceled) ### Claim 23 A display device comprising: a substrate; a plurality of light-emitting elements on the substrate, the plurality of light-emitting elements including a first electrode, a second electrode, and a quantum dot layer located between the first electrode and the second electrode and including a plurality of quantum dots and a first inorganic material; and an inorganic layer located between at least two of the light-emitting elements and including a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator.