# US 10,319,924 B2 · Method for manufacturing flexible substrate, flexible substrate and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,924 B2 - Document ID: US10319924B2 - Status: Granted - Kind: B2 - Application number: 15/503,994 - Filed: 2016-06-06 - Published: 2018-04-19 - Granted: 2019-06-11 - Earliest claimed: 2016-01-20 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Ming-Che Hsieh; Lu Liu; Chunyan Xie; Hejin Wang - Web page: https://patentgrep.com/patent/US10319924B2 ## CPC - B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)} - B32B 3/263: {characterised by a layer having non-uniform thickness} - B32B 7/02: Physical, chemical or physicochemical properties - B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} - B32B 27/08: of synthetic resin - B32B 27/281: {comprising polyimides} - H10K 59/121: characterised by the geometry or disposition of pixel elements - H10K 71/80: using temporary substrates - H10K 77/111: {Flexible substrates} - H10P 72/74: {using temporarily an auxiliary support} - B32B 2250/02: 2 layers - B32B 2307/7244: Oxygen barrier - B32B 2307/7265: Non-permeable - B32B 2307/732: Dimensional properties - B32B 2307/748: Releasability - B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays - H10K 2102/311: {Flexible OLED} - Y02E 10/549: Organic PV cells - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H10P: GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A method for manufacturing a flexible substrate, a flexible substrate manufactured using the method and a display device including the flexible substrate are disclosed. The method includes steps of: coating a glass carrier with a plurality of film layers, wherein each of at least one pair of adjacent film layers of the plurality of film layers is formed through steps of: S1: coating the glass carrier with a first film layer; and S2: coating the glass carrier with a second film layer over the first film layer so that the second film layer covers the first film layer, wherein the second film layer has an area greater than an area of the first film layer; and peeling off the plurality of formed film layers from the glass carrier to form a flexible substrate. ## Claims ### Claim 1 A method for manufacturing a flexible substrate, comprising steps of: coating a glass carrier with a plurality of film layers, wherein each of at least one pair of adjacent film layers of the plurality of film layers is formed through steps of: S1: coating the glass carrier with a first film layer; and S2: coating the glass carrier with a second film layer over the first film layer so that the second film layer covers the first film layer, wherein the second film layer has an area greater than an area of the first film layer; and peeling off the plurality of film layers from the glass carrier to form the flexible substrate, wherein a portion having an unstable thickness is formed at an edge of the first film layer during the step S1, the first film layer being made from polyimide, and the portion having the unstable thickness is covered by the second film layer so that the portion having the unstable thickness is only formed at an edge of the second film layer, wherein the portion having the unstable thickness is a raised portion, a height of which is 10% of a thickness of the film layers, and wherein the glass carrier is coated with the first film layer and the second film layer by means of a slit extrusion coating. ### Claim 2 (depends on 1) The method according to claim 1, wherein in step S2, an edge of the first film layer is spaced apart from an edge of the second film layer by a distance of 5 mm or more. ### Claim 3 (depends on 1) The method according to claim 1, wherein the at least one pair of adjacent film layers comprises one pair of adjacent film layers, and the first film layer is coated on the glass carrier. ### Claim 4 (depends on 1) The method according to claim 1, wherein the second film layer is a polyimide film layer. ### Claim 5 (depends on 1) A flexible substrate manufactured by the method according to claim 1. ### Claim 6 (depends on 5) The flexible substrate according to claim 5, wherein a thickness of the second film layer is greater than or equal to 10% of a thickness of the first film layer. ### Claim 7 (depends on 5) A display device, comprising the flexible substrate according to claim 5. ### Claim 8 (depends on 6) A display device, comprising the flexible substrate according to claim 6. ### Claim 9 (depends on 2) The method according to claim 2, wherein the at least one pair of adjacent film layers comprises one pair of adjacent film layers, and the first film layer is coated on the glass carrier. ### Claim 10 (depends on 2) The method according to claim 2, wherein the second film layer is a polyimide film layer. ### Claim 11 (depends on 2) A flexible substrate manufactured by the method according to claim 2. ### Claim 12 (depends on 3) A flexible substrate manufactured by the method according to claim 3. ### Claim 13 (depends on 3) The method according to claim 3, wherein the second film layer is a polymide film layer. ### Claim 14 (depends on 4) A flexible substrate manufactured by the method according to claim 4. ### Claim 15 (depends on 13) A flexible substrate manufactured by the method according to claim 13.