# US 10,483,483 B2 · Electroluminescent device and electroluminescent display device including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,483 B2 - Document ID: US10483483B2 - Status: Granted - Kind: B2 - Application number: 15/836,732 - Filed: 2017-12-08 - Published: 2018-06-21 - Granted: 2019-11-19 - Earliest claimed: 2016-12-16 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Hak-Min Lee; Young-Jun Yu; Hee-Jin Kim; Sung-Soo Park - Web page: https://patentgrep.com/patent/US10483483B2 ## CPC - H10K 50/17: Carrier injection layers - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - H10K 59/879: {comprising refractive means, e.g. lenses} - G09G 2310/0264: Details of driving circuits - H10K 50/15: Hole transporting layers - H10K 50/82: Cathodes - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers} - H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract Provided are an electroluminescent device and an electroluminescent display device. The electroluminescent device includes an anode and a cathode facing each other, a light compensation layer located between the anode and the cathode and having a first refractive index, and an emitting material layer located between the light compensation layer and the cathode, and having a second refractive index higher than the first refractive index. ## Claims ### Claim 1 An electroluminescent device comprising: an anode and a cathode facing each other; a light compensation layer located between the anode and the cathode, the light compensation layer having a first refractive index; an emitting material layer located between the light compensation layer and the cathode, the emitting material layer having a second refractive index higher than the first refractive index; and a hole injection layer located between the emitting material layer and the light compensation layer or between the light compensation layer and the anode, wherein the hole injection layer has a third refractive index higher than the first refractive index, and wherein the light compensation layer has a thickness smaller than a thickness of the emitting material layer and a thickness of the hole injection layer. ### Claim 2 (depends on 1) The electroluminescent device of claim 1, wherein a difference between the first refractive index and the second refractive index is 0.4 or more. ### Claim 3 (depends on 1) The electroluminescent device of claim 1, wherein the emitting material layer is in contact with the cathode. ### Claim 4 (depends on 1) The electroluminescent device of claim 1, wherein the anode comprises a first transparent electrode layer. ### Claim 5 (depends on 4) The electroluminescent device of claim 4, wherein the anode further comprises: a second transparent layer facing the first transparent electrode layer; and a reflective electrode layer located between the first and second transparent electrode layers. ### Claim 6 An electroluminescent display device comprising: a substrate; an electroluminescent device located on the substrate, the device comprising: an anode and a cathode facing each other, a light compensation layer located between the anode and the cathode, the light compensation layer having a first refractive index, an emitting material layer located between the light compensation layer and the cathode, the emitting material layer having a second refractive index higher than the first refractive index, and a hole injection layer located between the emitting material layer and the light compensation layer or between the light compensation layer and the anode; and a thin-film transistor located between the substrate and the electroluminescent device, and connected to the electroluminescent device, wherein the hole injection layer has a third refractive index higher than the first refractive index, and wherein the light compensation layer has a thickness smaller than a thickness of the emitting material layer and a thickness of the hole injection layer. ### Claim 7 (depends on 6) The electroluminescent device of claim 6, wherein a difference between the first refractive index and the second refractive index is 0.4 or more. ### Claim 8 (depends on 6) The electroluminescent device of claim 6, wherein the emitting material layer is in contact with the cathode. ### Claim 9 (depends on 6) The electroluminescent device of claim 6, wherein the light compensation layer has a thickness smaller than those of the emitting material layer and the hole injection layer. ### Claim 10 (depends on 6) The electroluminescent device of claim 6, wherein the anode comprises a first transparent electrode layer. ### Claim 11 (depends on 10) The electroluminescent device of claim 10, wherein the anode further comprises: a second transparent layer facing the first transparent electrode layer; and a reflective electrode layer located between the first and second transparent electrode layers. ### Claim 12 An electroluminescent device comprising: an anode and a cathode facing each other, the anode comprising: a first transparent electrode layer, a second transparent layer facing the first transparent electrode layer, and a reflective electrode layer located between the first and second transparent electrode layers; a light compensation layer located between the anode and the cathode, the light compensation layer having a first refractive index; and an emitting material layer located between the light compensation layer and the cathode, the emitting material layer having a second refractive index higher than the first refractive index, wherein a hole injection layer has a third refractive index higher than the first refractive index.