# US 2016/0254331 A1 · Oled display device and manufacturing method thereof, and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0254331 A1 - Document ID: US20160254331A1 - Status: Published application - Kind: A1 - Application number: 14/439,915 - Filed: 2014-08-15 - Published: 2016-09-01 - Earliest claimed: 2014-04-01 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Huifeng WANG - Web page: https://patentgrep.com/patent/US20160254331A1 ## CPC - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/1201: {Manufacture or treatment} - H10K 71/135: {using ink-jet printing} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract An OLED display device and manufacturing method thereof are provided. The method comprises: forming an array comprising first electrodes on a base substrate, with an area to which the first electrodes correspond being a display area; forming pixel defining layers respectively between the first electrodes so that a width of a cross section of each pixel defining layer is relatively larger at a middle portion and reduced gradually towards an upper portion and a lower portion; forming organic light-emitting layers respectively on the first electrodes between the pixel defining layers; and at least forming a second electrode which is at least provided on the organic light-emitting layers. The OLED display device made in this method can minimize the coffee ring effect of the organic light-emitting layers, avoid the layer-broken phenomenon occurring to the second electrode, and thus improve the display quality and save the material for the second electrode. ## Claims ### Claim 1 A method for manufacturing an organic light-emitting diode (OLED) display device comprising: forming an array comprising first electrodes on a base substrate, wherein an area to which the first electrodes correspond is a display area; forming pixel defining layers respectively between the first electrodes so that a width of a cross section of each pixel defining layer is relatively larger at a middle portion and reduced gradually towards an upper portion and towards a lower portion; forming organic light-emitting layers respectively on the first electrodes between the pixel defining layers; and forming a second electrode which is at least provided on the organic light-emitting layers. ### Claim 2 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein forming the pixel defining layers respectively between the first electrodes comprises: forming a photoresist on the base substrate on which the first electrodes are formed; irradiating light, which passes through a mask plate, on the photoresist at a predetermined first incident angle with respect to a direction perpendicular to the base substrate, to perform first exposure to the photoresist; irradiating light, which passes through the mask plate, onto the photoresist at a predetermined second incident angle with respect to the direction perpendicular to the base substrate, to perform second exposure to the photoresist, developing to remove the photoresist corresponding to the display area and hence exposing the first electrodes, wherein lines in which an incident direction of the light in the first exposure is located and lines in which an incident direction of the light in the second exposure is located are respectively arranged on opposite sides of normal lines which respectively pass through centers of the first electrodes exposed, so that the width of the cross section of each pixel defining layer formed is relatively larger at the middle portion and reduced gradually towards the upper portion and towards the lower portion, and the first incident angle and the second incident angle are both larger than 0° and smaller than 90°. ### Claim 3 (depends on 2) The method for manufacturing the OLED display device according to claim 2, wherein the lines in which the incident direction of the light in the first exposure is located and the lines in which the incident direction of the light in the second exposure is located are symmetrical with respect to the normal lines which respectively pass through the centers of the first electrodes exposed, correspondingly. ### Claim 4 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein forming the pixel defining layers respectively between the first electrodes comprises: forming a photoresist on the base substrate on which the first electrodes are formed; diffracting light after the light passes through light through holes of the mask plate, and irradiating the light diffracted onto the photoresist corresponding to the display area to perform first exposure to the photoresist, so that a cross section of the photoresist unexposed has a shape of inverted trapezoids; and irradiating the photoresist, the cross section of which has a shape of inverted trapezoids, in areas corresponding to two base angles at an upper bottom of the respective inverted trapezoids, to perform second exposure to the photoresist, so that the width of the cross section of each pixel defining layer formed after development is relatively larger at the middle portion and reduced gradually towards the upper portion and towards the lower portion. ### Claim 5 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein a thickness of each of the organic light-emitting layers formed is not smaller than a height of a widest position at the middle portion of each of the pixel defining layers. ### Claim 6 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein a thickness of each of the pixel defining layers is from 0.1 μm to 100 μm. ### Claim 7 (depends on 6) The method for manufacturing the OLED display device according to claim 6, wherein the thickness of the pixel defining layer is from 1 μm to 5 μm. ### Claim 8 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein surfaces from a widest position of the middle portion of each pixel defining layer to the upper portion and the lower portion respectively are flat surfaces or curved surfaces, or of ladder shapes. ### Claim 9 (depends on 1) The method for manufacturing the OLED display device according to claim 1, wherein the cross section of each of the pixel defining layers is hexagonal or oval. ### Claim 10 An organic light-emitting diode (OLED) display device comprising an array of first electrodes, pixel defining layers, organic light-emitting layers and a second electrode, wherein the pixel defining layers are respectively arranged between the first electrodes, and the organic light-emitting layers and the second electrode are successively arranged on the array of first electrodes, and a width of a cross section of each pixel defining layer is relatively larger at a middle portion and reduced successively towards an upper portion and towards a lower portion. ### Claim 11 (depends on 10) The OLED display device according to claim 10, wherein a thickness of each of the organic light-emitting layers is not smaller than a height of a widest position of the middle portion of the pixel defining layer. ### Claim 12 (depends on 10) The OLED display device according to claim 10, wherein a thickness of the pixel defining layer is from 0.1 μm to 100 μm. ### Claim 13 (depends on 12) The OLED display device according to claim 12, wherein the thickness of the pixel defining layer is from 1 μm to 5 μm. ### Claim 14 (depends on 10) The OLED display device according to claim 10, wherein a material for the pixel defining layers comprises resin, polyimide, organic silicon, or SiO2. ### Claim 15 (depends on 10) The OLED display device according to claim 10, wherein surfaces from a widest position of the middle portion of each pixel defining layer to the upper portion and the lower portion are respectively flat surfaces, curved surfaces or of ladder shapes. ### Claim 16 (depends on 10) The OLED display device according to claim 10, wherein the cross section of the pixel defining layer is hexagonal or oval. ### Claim 17 A display apparatus comprising an OLED display device, wherein the OLED display device comprises an array of first electrodes, pixel defining layers, organic light-emitting layers and a second electrode, the pixel defining layers are respectively arranged between the first electrodes, the organic light-emitting layers and the second electrode are successively arranged on the array of first electrodes, and a width of a cross section of each pixel defining layer is relatively larger at a middle portion and reduced successively towards an upper portion and towards a lower portion. ### Claim 18 (depends on 11) The OLED display device according to claim 11, wherein a thickness of the pixel defining layer is from 0.1 μm to 100 μm. ### Claim 19 (depends on 11) The OLED display device according to claim 11, wherein a material for the pixel defining layers comprises resin, polyimide, organic silicon, or SiO2. ### Claim 20 (depends on 12) The OLED display device according to claim 12, wherein a material for the pixel defining layers comprises resin, polyimide, organic silicon, or SiO2.