# US 10,873,050 B2 · Organic EL display device and organic EL display device manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,050 B2 - Document ID: US10873050B2 - Status: Granted - Kind: B2 - Application number: 16/088,458 - Filed: 2017-03-22 - Published: 2020-09-24 - Granted: 2020-12-22 - Earliest claimed: 2016-03-29 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Yuto Tsukamoto; Seiichi Mitsui; Shinichi Kawato; Manabu Niboshi; Eiji Koike; Masanori Ohara; Asae Ito - Web page: https://patentgrep.com/patent/US10873050B2 ## CPC - 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 - H10K 50/131: {with spacer layers between the electroluminescent layers} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass - H10K 71/16: using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering - H10K 2102/351: {Thickness} - 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 - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract An organic EL display device with higher resolution, suppressed power consumption while being driven and low manufacturing cost, and no color mixing and color shifting between subpixels adjacent to each other is provided. In a B subpixel, a first separation layer is provided between a common blue-light-emitting layer and a common green-light-emitting layer. In a G subpixel, a second separation layer is provided between the common green-light-emitting layer and a common red-light-emitting layer. ## Claims ### Claim 1 An organic electro luminescence (EL) display device comprising: a plurality of pixels each including: a first subpixel; a second subpixel; and a third subpixel, the first, second, and third subpixels being configured to emit light with peak wavelengths different from each other, and the first, second, and third subpixels each including: a positive electrode; a negative electrode; and a light-emitting layer formed between the positive electrode and the negative electrode, wherein either of the positive electrode and the negative electrode is a reflective electrode or includes a reflective layer, and another of the positive electrode and the negative electrode is a transparent electrode or a translucent electrode configured to transmit the light with peak wavelengths different from each other, the light-emitting layer is a layered film including: a first fluorescence light-emitting layer configured to emit light with a longest peak wavelength; a second fluorescence light-emitting layer configured to emit light with a shortest peak wavelength; and a third fluorescence light-emitting layer configured to emit light with a peak wavelength between the longest peak wavelength of the first fluorescence light-emitting layer and the shortest peak wavelength of the second fluorescence light-emitting layer, the first fluorescence light-emitting layer, the second fluorescence light-emitting layer, and the third fluorescence light-emitting layer are each formed as a single common layer in the plurality of pixels, the first fluorescence light-emitting layer is arranged above or below the second fluorescence light-emitting layer and the third fluorescence light-emitting layer, in the first subpixel, a first separation layer without including a light-emitting material is provided between the second fluorescence light-emitting layer and the third fluorescence light-emitting layer, and in the second subpixel, a second separation layer without containing a light-emitting material is provided between the first fluorescence light-emitting layer and a fluorescence light-emitting layer lying adjacent to the first fluorescence light-emitting layer. ### Claim 2 (depends on 1) The organic EL display device according to claim 1, wherein the first fluorescence light-emitting layer is a light-emitting layer for red light, the second fluorescence light-emitting layer is a light-emitting layer for blue light, and the third fluorescence light-emitting layer is a light-emitting layer for green light. ### Claim 3 (depends on 1) The organic EL display device according to claim 1, wherein at least either of the first separation layer and the second separation layer is a layered film of a plurality of layers. ### Claim 4 (depends on 1) The organic EL display device according to claim 1, wherein the first separation layer has a film thickness ranging from 15 nm to 50 nm, both inclusive. ### Claim 5 (depends on 1) The organic EL display device according to claim 1, wherein the second separation layer has a film thickness ranging from 15 nm to 50 nm, both inclusive. ### Claim 6 (depends on 1) The organic EL display device according to claim 1, wherein a third fluorescence light-emitting material contained in the third fluorescence light-emitting layer contains a thermally activated delayed fluorescence material with an energy difference of less than 0.3 eV between a minimum excited singlet level and a minimum excited triplet level. ### Claim 7 (depends on 1) The organic EL display device according to claim 1, wherein a second block layer without containing a light-emitting material is formed between the second fluorescence light-emitting layer and the third fluorescence light-emitting layer as a single common layer in the plurality of pixels, and in the first subpixel, a film thickness of the first separation layer and the second block layer ranges from 15 nm to 50 nm, both inclusive. ### Claim 8 (depends on 1) The organic EL display device according to claim 1, wherein a wavelength range of a light-emitting spectrum of the second fluorescence light-emitting material contained in the second fluorescence light-emitting layer and a wavelength range of an absorption spectrum of the third fluorescence light-emitting material contained in the third fluorescence light-emitting layer overlap with each other within a predetermined wavelength range. ### Claim 9 (depends on 1) The organic EL display device according to claim 1, wherein a wavelength range of a light-emitting spectrum of the third fluorescence light-emitting material contained in the third fluorescence light-emitting layer and a wavelength range of an absorption spectrum of a first fluorescence light-emitting material contained in the first fluorescence light-emitting layer overlap with each other within a predetermined wavelength range. ### Claim 10 (depends on 1) The organic EL display device according to claim 1, wherein a wavelength range of an absorption spectrum of the first separation layer does not overlap with the wavelength range of the light-emitting spectrum of the second fluorescence light-emitting material contained in the second fluorescence light-emitting layer. ### Claim 11 (depends on 1) The organic EL display device according to claim 1, wherein a wavelength range of an absorption spectrum of the second separation layer does not overlap with the wavelength range of the light-emitting spectrum of the third fluorescence light-emitting material contained in the third fluorescence light-emitting layer. ### Claim 12 (depends on 1) The organic EL display device according to claim 1, wherein, between the positive electrode and the negative electrode, among the first fluorescence light-emitting layer, the second fluorescence light-emitting layer, and the third fluorescence light-emitting layer, the first fluorescence light-emitting layer is arranged most adjacent to the negative electrode, and the second fluorescence light-emitting layer is arranged most adjacent to the positive electrode, and electron mobility of a material contained at a combination ratio of 50% or higher in a layer formed above the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the negative electrode is higher than hole mobility. ### Claim 13 (depends on 1) The organic EL display device according to claim 1, wherein, between the positive electrode and the negative electrode, among the first fluorescence light-emitting layer, the second fluorescence light-emitting layer, and the third fluorescence light-emitting layer, the first fluorescence light-emitting layer is arranged most adjacent to the positive electrode, and the second fluorescence light-emitting layer is arranged most adjacent to the negative electrode, and hole mobility of a material contained at a combination ratio of 50% or higher in a layer formed below the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the positive electrode is higher than electron mobility. ### Claim 14 (depends on 1) The organic EL display device according to claim 1, wherein, between the positive electrode and the negative electrode, among the first fluorescence light-emitting layer, the second fluorescence light-emitting layer, and the third fluorescence light-emitting layer, the first fluorescence light-emitting layer is arranged most adjacent to the negative electrode, and the third fluorescence light-emitting layer is arranged most adjacent to the positive electrode, electron mobility of a material contained at a combination ratio of 50% or higher in a layer formed above the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the negative electrode is higher than hole mobility, and hole mobility of a material contained at a combination ratio of 50% or higher in a layer formed below the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the positive electrode is higher than electron mobility. ### Claim 15 (depends on 1) The organic EL display device according to claim 1, wherein, between the positive electrode and the negative electrode, among the first fluorescence light-emitting layer, the second fluorescence light-emitting layer, and the third fluorescence light-emitting layer, the first fluorescence light-emitting layer is arranged most adjacent to the positive electrode, and the third fluorescence light-emitting layer is arranged most adjacent to the negative electrode, electron mobility of a material contained at a combination ratio of 50% or higher in a layer formed above the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the negative electrode is higher than hole mobility, and hole mobility of a material contained at a combination ratio of 50% or higher in a layer formed below the second fluorescence light-emitting layer, and between the second fluorescence light-emitting layer and the positive electrode is higher than electron mobility. ### Claim 16 (depends on 1) The organic EL display device according to claim 1, wherein, with layers layered in the light-emitting layer, the light with peak wavelengths different from each other is emitted in a direction of increase in film thickness of the light-emitting layer. ### Claim 17 (depends on 1) The organic EL display device according to claim 1, wherein, with layers layered in the light-emitting layer, the light with peak wavelengths different from each other is emitted in a direction opposite to the direction of increase in film thickness of the light-emitting layer. ### Claim 18 An organic electro luminescence (EL) display device manufacturing method for producing an organic EL display device including a plurality of pixels each including a first subpixel, a second subpixel, and a third subpixel, the first, second, and third subpixels being configured to emit light with peak wavelengths different from each other, the organic EL display device manufacturing method comprising: forming a positive electrode; forming a negative electrode; and forming a light-emitting layer, wherein, in the forming a light-emitting layer, a first fluorescence light-emitting layer configured to emit light with a longest peak wavelength, a second fluorescence light-emitting layer configured to emit light with a shortest peak wavelength, and a third fluorescence light-emitting layer configured to emit light with a peak wavelength between the longest peak wavelength of the first fluorescence light-emitting layer and the shortest peak wavelength of the second fluorescence light-emitting layer are vapor-deposited over the plurality of pixels to allow the first fluorescence light-emitting layer to lie above or below the second fluorescence light-emitting layer and the third fluorescence light-emitting layer, between the second fluorescence light-emitting layer and the third fluorescence light-emitting layer, a first separation layer without containing a light-emitting material is separately patterning vapor deposited onto the first subpixel, and between the first fluorescence light-emitting layer and a fluorescence light-emitting layer lying adjacent to the first fluorescence light-emitting layer, a second separation layer without containing a light-emitting material is separately patterning vapor deposited onto the second subpixel.