# US 10,481,438 B2 · Display baseplate and preparation method thereof, 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 10,481,438 B2 - Document ID: US10481438B2 - Status: Granted - Kind: B2 - Application number: 15/744,995 - Filed: 2017-09-13 - Published: 2019-01-10 - Granted: 2019-11-19 - Earliest claimed: 2017-02-16 - Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Inventors: Wei Cao - Web page: https://patentgrep.com/patent/US10481438B2 ## CPC - G02F 1/133723: {Polyimide, polyamide-imide} - C08K 3/042: {Graphene or derivatives, e.g. graphene oxides} - C08L 79/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - C09D 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - C09K 19/56: Aligning agents - G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)} - H10W 72/00: Interconnections or connectors in packages - G02F 1/1362: Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)} - G02F 2202/16: conductive - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A display baseplate and preparation method thereof, and a display device are provided, which belong to the field of display technology. The display baseplate includes a substrate and a conductive alignment film over the substrate. The conductive alignment film is of a composite material comprising graphene and polyimide. ## Claims ### Claim 1 A display baseplate, comprising: a substrate and a conductive alignment film over the substrate, wherein the conductive alignment film is of a composite material comprising graphene, polyacrylic acid, and polyimide. ### Claim 2 (depends on 1) The display baseplate according to claim 1, wherein a content of the polyimide by weight is greater than that of the graphene in the composite material. ### Claim 3 (depends on 2) The display baseplate according to claim 2, wherein the content of the polyimide by weight in the composite material is greater than 50%. ### Claim 4 (depends on 2) The display baseplate according to claim 2, wherein the content of the polyimide by weight in the composite material is greater than 80%. ### Claim 5 (depends on 1) The display baseplate according to claim 1, wherein a content of the polyimide by weight is greater than that of the polyacrylic acid in the composite material. ### Claim 6 (depends on 1) A display device, comprising the display baseplate according to claim 1. ### Claim 7 A method for preparing a display baseplate, comprising: forming a composite material comprising graphene and polyimide; and forming a conductive alignment film on a substrate of the display baseplate, wherein conductive alignment film is formed using the composite material, wherein forming of the composite material comprises: providing graphene oxide; preparing a mixture of graphene oxide and polyacrylic acid; and causing a reduction of the mixture of the graphene oxide and polyacrylic acid, thereby producing the composite material comprising graphene and polyimide. ### Claim 8 (depends on 7) The method according to claim 7, wherein preparing of the mixture of graphene oxide and polyacrylic acid comprises: dissolving the graphene oxide and a polyacrylic acid each in a solvent to form a graphene oxide solution and a polyacrylic acid solution respectively; and mixing the graphene oxide solution and the polyacrylic acid solution. ### Claim 9 (depends on 8) The method according to claim 8, wherein a ratio of the graphene oxide to the solvent is 1:100 to 1:50, and a ratio of the polyacrylic acid to the solvent is 1:100 to 1:50. ### Claim 10 (depends on 9) The method according to claim 9, wherein the ratio of the graphene oxide solution to the polyacrylic acid solution is 1:200 to 1:20. ### Claim 11 (depends on 8) The method according to claim 8, wherein the solvent comprises water or N-methyl pyrrolidone. ### Claim 12 (depends on 7) The method according to claim 7, wherein forming of the conductive alignment film comprises: dissolving the composite material in an organic solvent; coating a substrate with the dissolved composite material by a wet coating process to form a coated baseplate; and drying the coated baseplate. ### Claim 13 (depends on 12) The method according to claim 12, further comprising washing the coated baseplate with deionized water to remove impurities. ### Claim 14 (depends on 7) The method according to claim 7, wherein a content of the polyimide by weight is greater than that of the graphene in the composite material. ### Claim 15 (depends on 7) The method according to claim 7, wherein the composite material further comprises the polyacrylic acid. ### Claim 16 (depends on 15) The method according to claim 15, wherein a content of the polyimide by weight is greater than that of the polyacrylic acid in the composite material. ### Claim 17 (depends on 16) The method according to claim 16, wherein the content of the polyimide by weight in the composite material is greater than 50%. ### Claim 18 (depends on 17) The method according to claim 17, wherein the content of the polyimide by weight in the composite material is greater than 80%.