# US 11,908,847 B2 · Image display element and method for manufacturing image display element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,847 B2 - Document ID: US11908847B2 - Status: Granted - Kind: B2 - Application number: 17/097,554 - Filed: 2020-11-13 - Published: 2021-05-20 - Granted: 2024-02-20 - Earliest claimed: 2019-11-18 - Assignees: Sharp Fukuyama Laser Co., Ltd. - Applicants: Sharp Fukuyama Laser Co., Ltd. - Inventors: Katsuji Iguchi; Hidenori Kawanishi; Koji Takahashi; Hiroaki Onuma - Web page: https://patentgrep.com/patent/US11908847B2 ## CPC - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - H10W 90/00: Package configurations - H10H 20/01: Manufacture or treatment - H10H 20/018: {Bonding of wafers} - H10H 20/833: Transparent materials - H10H 20/835: {Reflective materials} - H10H 20/851: Wavelength conversion means - H10H 20/856: Reflecting means - H10H 20/0137: {the light-emitting regions comprising nitride materials} - H10H 20/0361: {of wavelength conversion means} - H10H 20/0363: {of optical field-shaping means} - H10H 20/825: containing nitrogen, e.g. GaN - 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 An image display element includes micro light emitting elements disposed in an array on a driving circuit substrate. An excitation light emitting element includes a main body including a compound semiconductor, a metal electrode disposed on a side of the main body located closer to the driving circuit substrate, and a transparent electrode disposed on an opposite side to the driving circuit substrate, and a light emission layer included in the main body is disposed on a side opposite to the driving circuit substrate from a center portion of the main body. ## Claims ### Claim 1 An image display element comprising: micro light emitting elements disposed in an array on a driving circuit substrate including a driving circuit configured to supply a current to the micro light emitting elements and cause the micro light emitting elements to emit light, wherein each of the micro light emitting elements emits light in a direction opposite the driving circuit substrate, each of the micro light emitting elements includes an excitation light emitting element configured to generate excitation light, a reflective wall surrounding the excitation light emitting element, and a wavelength conversion material disposed inside the reflective wall, a sidewall of the reflective wall is not in contact with a sidewall of the excitation light emitting element and is inclined to open with respect to a light emission direction of each of the micro light emitting elements, the wavelength conversion material absorbs the excitation light and emits light having a wavelength longer than a wavelength of the excitation light, the wavelength conversion material covers all surfaces of the excitation light emitting element excluding a surface of the excitation light emitting element closer to the driving circuit substrate, and the excitation light emitting element includes a main body including a compound semiconductor, a metal electrode disposed on a first side of the main body relatively closer to the driving circuit substrate, and a transparent electrode disposed on a second side of the main body relatively farther from the driving circuit substrate, wherein a light blocking material having insulation properties is disposed at a bottom portion of the reflective wall, and the light blocking material is in contact with the metal electrode and the reflective wall. ### Claim 2 (depends on 1) The image display element according to claim 1, wherein each of the micro light emitting elements further includes a light distribution control member on a light emitting surface. ### Claim 3 (depends on 1) The image display element according to claim 1, wherein the metal electrode and the reflective wall overlap each other in a plan view. ### Claim 4 (depends on 1) The image display element according to claim 1, wherein an area of a drive electrode on the driving circuit substrate to which the metal electrode is connected is less than an area of the metal electrode. ### Claim 5 (depends on 1) The image display element according to claim 1, wherein an area of a drive electrode on the driving circuit substrate to which the metal electrode is connected is greater than an area of the metal electrode. ### Claim 6 (depends on 1) The image display element according to claim 1, wherein each of the micro light emitting elements further includes a resin layer disposed on the wavelength conversion material between the reflective wall, wherein a refractive index of the resin layer is less than a refractive index of the wavelength conversion material. ### Claim 7 (depends on 1) The image display element according to claim 1, wherein an inclination angle of a side surface of the reflective wall ranges from 85 degrees to 45 degrees. ### Claim 8 (depends on 1) The image display element according to claim 1, wherein the excitation light emitting element further includes a plurality of the transparent electrodes. ### Claim 9 (depends on 1) The image display element according to claim 1, wherein an N-side layer included in the main body is disposed on the first side and a P-side layer included in the main body is disposed on the second side. ### Claim 10 An image display element comprising: micro light emitting elements disposed in an array on a driving circuit substrate including a driving circuit configured to supply a current to the micro light emitting elements and cause the micro light emitting elements to emit light, wherein each of the micro light emitting elements emits light in a direction opposite the driving circuit substrate, each of the micro light emitting elements includes an excitation light emitting element configured to generate excitation light, a reflective wall surrounding the excitation light emitting element, and a transparent portion disposed inside the reflective wall, a sidewall of the reflective wall is not in contact with a sidewall of the excitation light emitting element and is inclined to open with respect to a light emission direction of each of the micro light emitting elements, the transparent portion covers all surfaces of the excitation light emitting element excluding a surface of the excitation light emitting element located closer to the driving circuit substrate, and the excitation light emitting element includes a main body including a compound semiconductor, a metal electrode disposed on a first side of the main body relatively closer to the driving circuit substrate, and a transparent electrode disposed on a second side of the main body relatively farther from the driving circuit substrate, wherein a light blocking material having insulation properties is disposed at a bottom portion of the reflective wall, and the light blocking material is in contact with the metal electrode and the reflective wall. ### Claim 11 (depends on 10) The image display element according to claim 10, wherein the micro light emitting element further includes a light distribution control member on a light emitting surface. ### Claim 12 (depends on 10) The image display element according to claim 10, wherein the metal electrode and the reflective wall overlap each other in a plan view. ### Claim 13 (depends on 10) The image display element according to claim 10, wherein an area of a drive electrode on the driving circuit substrate to which the metal electrode is connected is less than an area of the metal electrode. ### Claim 14 (depends on 10) The image display element according to claim 10, wherein the excitation light emitting element further includes a plurality of the transparent electrodes. ### Claim 15 (depends on 10) The image display element according to claim 10, wherein an N-side layer included in the main body is disposed on the first side and a P-side layer included in the main body is disposed on the second side. ### Claim 16 (depends on 10) The image display element according to claim 10, wherein each of the micro light emitting elements further includes a resin layer disposed on the transparent portion between the reflective wall, wherein a refractive index of the resin layer is less than a refractive index of the transparent portion. ### Claim 17 An image display element comprising: micro light emitting elements disposed in an array on a driving circuit substrate including a driving circuit configured to supply a current to the micro light emitting elements and cause the micro light emitting elements to emit light, wherein each of the micro light emitting elements emits light in a direction opposite the driving circuit substrate, each of the micro light emitting elements includes an excitation light emitting element configured to generate excitation light, a reflective wall surrounding the excitation light emitting element, and a wavelength conversion material disposed inside the reflective wall, a sidewall of the reflective wall is not in contact with a sidewall of the excitation light emitting element and is inclined to open with respect to a light emission direction of each of the micro light emitting elements, the wavelength conversion material absorbs the excitation light and emits light having a wavelength longer than a wavelength of the excitation light, the wavelength conversion material covers all surfaces of the excitation light emitting element excluding a surface of the excitation light emitting element closer to the driving circuit substrate, and the excitation light emitting element includes a main body including a compound semiconductor, a metal electrode disposed on a first side of the main body relatively closer to the driving circuit substrate, and a transparent electrode disposed on a second side of the main body relatively farther from the driving circuit substrate, wherein a light emission layer included in the main body is disposed in a region of the main body close to the second side, a first drive electrode and a second drive electrode are provided on the driving circuit substrate, wherein the first drive electrode is provided between the drive circuit substrate and the metal electrode and is electrically connected to the metal electrode, and the second drive electrode is provided between the drive circuit substrate and the reflective wall and is electrically connected to the transparent electrode. ### Claim 18 An image display element comprising: micro light emitting elements disposed in an array on a driving circuit substrate including a driving circuit configured to supply a current to the micro light emitting elements and cause the micro light emitting elements to emit light, wherein each of the micro light emitting elements emits light in a direction opposite the driving circuit substrate, each of the micro light emitting elements includes an excitation light emitting element configured to generate excitation light, a reflective wall surrounding the excitation light emitting element, and a transparent portion disposed inside the reflective wall, a sidewall of the reflective wall is not in contact with a sidewall of the excitation light emitting element and is inclined to open with respect to a light emission direction of each of the micro light emitting elements, the transparent portion covers all surfaces of the excitation light emitting element excluding a surface of the excitation light emitting element located closer to the driving circuit substrate, and the excitation light emitting element includes a main body including a compound semiconductor, a metal electrode disposed on a first side of the main body relatively closer to the driving circuit substrate, and a transparent electrode disposed on a second side of the main body relatively farther from the driving circuit substrate, wherein a light emission layer included in the main body is disposed in a region of the main body close to the second side, a first drive electrode and a second drive electrode are provided on the driving circuit substrate, wherein the first drive electrode is provided between the drive circuit substrate and the metal electrode and is electrically connected to the metal electrode, and the second drive electrode is provided between the drive circuit substrate and the reflective wall and is electrically connected to the transparent electrode.