# US 9,753,331 B2 · Alignment film and fabrication method thereof, liquid crystal panel 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 9,753,331 B2 - Document ID: US9753331B2 - Status: Granted - Kind: B2 - Application number: 14/428,491 - Filed: 2014-06-30 - Published: 2016-01-14 - Granted: 2017-09-05 - Earliest claimed: 2014-01-26 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Jifeng Tan; Xinxing Wang; Jikai Yao; Jaegeon You - Web page: https://patentgrep.com/patent/US9753331B2 ## CPC - G02F 1/133711: {by organic films, e.g. polymeric films} - C09K 19/32: containing condensed ring systems, i.e. fused, bridged or spiro ring systems - C09K 19/3475: {the heterocyclic ring being a six-membered aromatic ring containing at least three nitrogen atoms} - C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition - C09K 2323/02: Alignment layer characterised by chemical composition - G02F 1/133726: {made of a mesogenic material} - G02F 1/133738: {for homogeneous alignment} - G02F 1/133742: {for homeotropic alignment} - 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 - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract An alignment film and a fabrication method thereof, a liquid crystal panel and a display device, relate to a field of liquid crystal display technology, which can avoid causing static electricity and generating dust during a rubbing process, as well as unevenness of alignment. The method comprises: dispersing discotic liquid crystal molecules containing hydrophobic branched chains in a solvent, to prepare a discotic liquid crystal molecule solution (101); and applying the discotic liquid crystal molecule solution on a substrate, and obtaining the alignment film after removing the solvent (102). ## Claims ### Claim 1 A method for fabricating an alignment film directly on a surface of a substrate, comprising: dispersing discotic liquid crystal molecules containing hydrophobic branched chains in a solvent, to prepare a discotic liquid crystal molecule solution; and applying the discotic liquid crystal molecule solution on the surface of the substrate, and removing the solvent to form the alignment film directly on a surface of a substrate by the discotic liquid crystal molecules, wherein, the discotic liquid crystal molecules include TCnAT with a chemical formula as: wherein, n in TCnAT is less than or equal to 6 or is equal to 12. ### Claim 2 (depends on 1) The fabrication method according to claim 1, wherein, the solvent in the discotic liquid crystal molecule solution includes chloroform, and a concentration of the discotic liquid crystal molecule solution is 0.001 wt % -5 wt %. ### Claim 3 (depends on 1) The fabrication method according to claim 1, wherein, a fabrication method of the hydroxylated substrate includes: performing an ultrasonic treatment with a hydrochloric acid solution on the substrate, after washing the substrate; soaking the substrate in concentrated H2SO4, after the substrate undergoing the ultrasonic treatment is washed with ultrapure water; boiling the soaked substrate in the ultrapure water, and then blow-drying the same with high purity nitrogen, to obtain the hydroxylated substrate. ### Claim 4 (depends on 1) The fabrication method according to claim 1, wherein, n in TCnAT is 2. ### Claim 5 An alignment film directly on a surface of a substrate, comprising discotic liquid crystal molecules containing hydrophobic branched chains, wherein, the discotic liquid crystal molecules include TCnAT with a chemical formula as: wherein, n in TCnAT is less than or equal to 6 or is equal to 12. ### Claim 6 (depends on 5) The alignment film according to claim 5, wherein, n in TCnAT is 2. ### Claim 7 A liquid crystal panel, comprising two display substrates and liquid crystal between the two display substrates, wherein, an alignment film is directly on a surface of a substrate, comprising discotic liquid crystal molecules containing hydrophobic branched chains, the alignment film is disposed at an inner side of at least one display substrate. ### Claim 8 (depends on 7) The liquid crystal panel according to claim 7, wherein, the alignment film disposed at the inner side of the display substrate is a homogeneous alignment film, or a homeotropic alignment film. ### Claim 9 (depends on 8) The liquid crystal panel according to claim 8, wherein, in the two display substrates, the alignment film at the inner side of one display substrate is the homogeneous alignment film, and the alignment film at the inner side of the other display substrate is the homeotropic alignment film. ### Claim 10 (depends on 9) The liquid crystal panel according to claim 9, wherein: the discotic liquid crystal molecules include TCnAT with a chemical formula as: wherein, n is a positive integer, n of TCnAT in the homogeneous alignment film is 2 or 6, and n of TCnAT in the homeotropic alignment film is 12. ### Claim 11 (depends on 1) The fabrication method according to claim 1, wherein, applying the discotic liquid crystal molecule solution on the surface of the substrate, and removing the solvent to form the alignment film directly on a surface of a substrate by the discotic liquid crystal molecules, includes: instilling a layer of the discotic liquid crystal molecule solution onto a the surface of the substrate which is hydroxylated, and removing the solvent by evaporation after spin coating, to obtain the alignment film.