# US 12,765,162 B2 · Electro-optical device and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,765,162 B2 - Document ID: US12765162B2 - Status: Granted - Kind: B2 - Application number: 18/616,522 - Filed: 2024-03-26 - Published: 2024-10-03 - Granted: 2026-10-13 - Earliest claimed: 2023-03-27 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Yuiga Hamade - Web page: https://patentgrep.com/patent/US12765162B2 ## CPC - H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light - H10K 50/82: Cathodes - H10K 50/856: comprising reflective means - H10K 59/352: {the areas of the RGB subpixels being different} - H10K 59/8052: {Cathodes} - H10K 2101/10: Triplet emission - H10K 2101/27: {Combination of fluorescent and phosphorescent emission} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract An electro-optical device includes first light-emitting element including counter electrode, first pixel electrode, and first light-emitting layer, and emitting light in first wavelength region, second light-emitting element including the counter electrode, second pixel electrode, and second light-emitting layer, and emitting light in second wavelength region, first reflection layer, first optical adjustment layer configured to adjust a first optical distance between the first reflection layer and the counter electrode, a second reflection layer, and a second optical adjustment layer configured to adjust a second optical distance between the second reflection layer and the counter electrode, wherein the light, in the first wavelength region resonates between the first reflection layer and the counter electrode, the light, in the second wavelength region resonates between the second reflection layer and the counter electrode, and a material forming the first light-emitting layer and a material forming the second light-emitting layer are different from each other. ## Claims ### Claim 1 An electro-optical device, comprising: a first light-emitting element including a counter electrode having a semi-transmissive property, a first pixel electrode having translucency, and a first light emission function layer including a first light-emitting layer, disposed between the first pixel electrode and the counter electrode, and being in contact with the first pixel electrode and the counter electrode, and configured to emit light in a first wavelength region; a second light-emitting element including the counter electrode, a second pixel electrode having translucency, and a second light emission function layer including a second light-emitting layer, disposed between the second pixel electrode and the counter electrode, and being in contact with the second pixel electrode and the counter electrode, and configured to emit light in a second wavelength region different from the first wavelength region; a first reflection layer; a first optical adjustment layer disposed between the first reflection layer and the first light-emitting element and configured to adjust a first optical distance between the first reflection layer and the counter electrode; a second reflection layer; and a second optical adjustment layer having a thickness different from a thickness of the first optical adjustment layer, disposed between the second reflection layer and the second light-emitting element, and configured to adjust a second optical distance between the second reflection layer and the counter electrode, wherein the light, in the first wavelength region, emitted by the first light-emitting element resonates between the first reflection layer and the counter electrode, and is emitted from the counter electrode, the light, in the second wavelength region, emitted by the second light-emitting element resonates between the second reflection layer and the counter electrode, and is emitted from the counter electrode, and a material forming the first light-emitting layer and a material forming the second light-emitting layer are different from each other. ### Claim 2 (depends on 1) The electro-optical device according to claim 1, wherein the first light emission function layer and the second light emission function layer include a common electron blocking layer in contact with the first light-emitting layer and the second light-emitting layer. ### Claim 3 (depends on 2) The electro-optical device according to claim 2, wherein a thickness of the electron blocking layer is smaller than a thickness of each of the first light-emitting layer and the second light-emitting layer. ### Claim 4 (depends on 2) The electro-optical device according to claim 2, wherein a lowest triplet excited level of the electron blocking layer is equal to or greater than 2.7 eV, when the light in the first wavelength region is light in a blue wavelength region, and the first light-emitting layer emits phosphorescence. ### Claim 5 (depends on 2) The electro-optical device according to claim 2, wherein a lowest triplet excited level of the electron blocking layer is equal to or greater than 2.5 eV, when the light in the first wavelength region is light in a blue wavelength region, the light in the second wavelength region is light in a green wavelength region, and the first light-emitting layer emits fluorescence, and the second light-emitting layer emits phosphorescence. ### Claim 6 (depends on 1) The electro-optical device according to claim 1, wherein a thickness of each of the first light emission function layer and the second light emission function layer is equal to or greater than 80 nm, and equal to or less than 150 nm. ### Claim 7 (depends on 1) The electro-optical device according to claim 1, wherein the first light-emitting element includes a first light-emitting region through which the light in the first wavelength region is transmitted, the second light-emitting element includes a second light-emitting region through which the light in the second wavelength region is transmitted, and the first light-emitting layer does not overlap the second light-emitting region in plan view, and the second light-emitting layer does not overlap the first light-emitting region in plan view. ### Claim 8 (depends on 7) The electro-optical device according to claim 7, wherein a distance between the first light-emitting region and the second light-emitting region is equal to or less than 3 μm. ### Claim 9 (depends on 1) An electronic apparatus comprising: the electro-optical device according to claim 1; and a control unit configured to control operation of the electro-optical device.