# US 10,870,752 B2 · Pixel defining layer and preparation material thereof, and display substrate and preparation method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,752 B2 - Document ID: US10870752B2 - Status: Granted - Kind: B2 - Application number: 16/452,773 - Filed: 2019-06-26 - Published: 2020-02-20 - Granted: 2020-12-22 - Earliest claimed: 2018-08-17 - Assignees: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd. - Inventors: Wei Li; Jingjing Xia; Bin Zhou; Dongfang Wang; Ce Zhao; Yingbin Hu; Wei Song - Web page: https://patentgrep.com/patent/US10870752B2 ## CPC - C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate} - C08L 33/12: Homopolymers or copolymers of methyl methacrylate - C08F 220/28: containing no aromatic rings in the alcohol moiety - C08F 220/34: Esters containing nitrogen {, e.g. N,N-dimethylaminoethyl (meth)acrylate} - C08F 292/00: Macromolecular compounds obtained by polymerising monomers on to inorganic materials - C08F 293/005: {using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent} - C08K 3/22: of metals - C08K 5/07: Aldehydes; Ketones - C08K 5/08: Quinones - C08K 5/18: with aromatically bound amino groups - C08K 5/32: Compounds containing nitrogen bound to oxygen - C08L 33/16: Homopolymers or copolymers of esters containing halogen atoms - H10K 59/122: Pixel-defining structures or layers, e.g. banks - C08F 220/343: {in the form of urethane links} - C08F 2438/01: Atom Transfer Radical Polymerization [ATRP] or reverse ATRP - C08K 5/06: Ethers; Acetals; Ketals; Ortho-esters - C08K 5/13: Phenols; Phenolates - C08K 2003/2272: {Ferric oxide (Fe2O3)} - C08K 2201/005: Additives being defined by their particle size in general - C08K 2201/01: Magnetic additives - C08K 2201/011: Nanostructured additives - C08L 83/04: Polysiloxanes - C08L 2203/206: use in coating or encapsulating of electronic parts - C08L 2205/02: containing two or more polymers of the same C08L -group - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract The present disclosure provides a pixel defining layer and a preparation material thereof, and a display substrate and a preparation method thereof, and relates to the field of display technologies. The preparation material of the pixel defining layer comprises the following components in mass percentages: 5%-30% of a lyophobic film-forming polymer, 0.5%-1% of lyophilic magnetic nanoparticles, 0.5%-2% of a photoinitiator, 0.1%-1% of a reactive monomer, 0.1%-1% of an additive and the balance of a solvent. ## Claims ### Claim 1 A preparation material of a pixel defining layer, the preparation material comprising the following components in mass percentages: 5%-30% of a lyophobic film-forming polymer, 0.5%-1% of lyophilic magnetic nanoparticles, 0.5%-2% of a photoinitiator, 0.1%-1% of a reactive monomer, 0.1%-1% of an additive and a balance of solvent. ### Claim 2 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the lyophobic film-forming polymer comprises a copolymer of methyl methacrylate and dodecafluoroheptyl methacrylate. ### Claim 3 (depends on 2) The preparation material of the pixel defining layer according to claim 2, wherein in the copolymer of methyl methacrylate and dodecafluoroheptyl methacrylate, the mass percentage of methyl methacrylate is 85%-95%, and the balance is dodecafluoroheptyl methacrylate. ### Claim 4 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the photoinitiator comprises at least one of nitroaniline, anthraquinone, benzophenone, and N-acetyl-4-nitro-naphthylamine. ### Claim 5 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the reactive monomer comprises at least one of dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, urethane acrylate, and ethoxylated pentaerythritol tetraacrylate. ### Claim 6 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the additive comprises at least one of a polymerization inhibitor, a leveling agent, an antifoaming agent, and a stabilizer. ### Claim 7 (depends on 6) The preparation material of the pixel defining layer according to claim 6, wherein the polymerization inhibitor comprises any one of hydroquinone, 2-sec-butyl-4,6-dinitrophenol, p-tert-butylcatechol and 2,5-di-tert-butylhydroquinone. ### Claim 8 (depends on 6) The preparation material of the pixel defining layer according to claim 6, wherein the leveling agent comprises any one of acrylic compound, organosilicon compound and fluorocarbon compound. ### Claim 9 (depends on 6) The preparation material of the pixel defining layer according to claim 6, wherein the antifoaming agent comprises at least one of emulsifying silicon oil, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene ether, polyoxypropylene glyceryl ether, polyoxypropylene polyoxyethylene glyceryl ether, and polydimethylsiloxane. ### Claim 10 (depends on 6) The preparation material of the pixel defining layer according to claim 6, wherein the stabilizer comprises at least one of isoamyl alcohol, n-hexanol, glycerol and n-hexane. ### Claim 11 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the solvent comprises at least one of N-methylpyrrolidone, glycol ether, ethylene glycol alkyl ether acetate, diethylene glycol, propylene glycol monomethyl ether acetate, ethyl ethoxyacetate, dimethoxyacetaldehyde, propylene glycol methyl ether acetate, ethyl 3-ethoxypropionate, propylene glycol monomethyl ether PM, and ethylene glycol ethyl ether acetate. ### Claim 12 (depends on 1) The preparation material of the pixel defining layer according to claim 1, wherein the lyophilic magnetic nanoparticles comprise: magnetic nanoparticles, a coupling agent coated on the outside of the magnetic nanoparticles, and a lyophilic polymer grafted onto the surface of the coupling agent. ### Claim 13 (depends on 12) The preparation material of the pixel defining layer according to claim 12, wherein the magnetic nanoparticles comprise ferroferric oxide nanoparticles; the coupling agent comprises silicon dioxide; and the lyophilic polymer comprises poly(methyl methacrylate-ethylene glycol methyl ether methacrylate). ### Claim 14 (depends on 1) A preparation method of a pixel defining layer, the preparation method comprising: providing an underlay substrate; coating the preparation material of the pixel defining layer according to claim 1 on the underlay substrate to form a wet film; removing solvent in the wet film, and inducing the lyophilic magnetic nanoparticles in the wet film to migrate toward the side close to the underlay substrate by an external magnetic field to obtain a transition film layer; and patterning the transition film layer to obtain the pixel defining layer. ### Claim 15 (depends on 14) The preparation method of the pixel defining layer according to claim 14, wherein the external magnetic field is an electromagnet located below the underlay substrate. ### Claim 16 (depends on 14) The preparation method of the pixel defining layer according to claim 14, wherein the distribution of the lyophilic magnetic nanoparticles in the pixel defining layer is controlled by adjusting at least one of the following operating conditions: the magnetic field strength of the external magnetic field, the time of action of the external magnetic field, and the mass concentration of the lyophilic magnetic nanoparticles. ### Claim 17 (depends on 14) A pixel defining layer prepared by the preparation method according to claim 14. ### Claim 18 (depends on 17) The pixel defining layer according to claim 17, the pixel defining layer comprising: a defining layer body, and lyophilic magnetic nanoparticles doped in a lower portion of the defining layer body; wherein the defining layer body is prepared by polymerizing a lyophobic film-forming polymer and a reactive monomer in a solvent under the action of a photoinitiator, and is doped with an additive. ### Claim 19 (depends on 1) A display substrate, comprising an underlay substrate, the display substrate further comprising: a pixel defining layer disposed on the underlay substrate; wherein the pixel defining layer comprises the preparation material of claim 1; and a pixel layer disposed in a pixel region defined by the pixel defining layer; the pixel defining layer comprises: a defining layer body, and lyophilic magnetic nanoparticles doped in a lower portion of the defining layer body; wherein the defining layer body is prepared by polymerizing a lyophobic film-forming polymer and a reactive monomer in a solvent under the action of a photoinitiator, and is doped with an additive. ### Claim 20 (depends on 1) A preparation method of a display substrate, the preparation method comprising: providing an underlay substrate; forming a pixel defining layer on the underlay substrate; and wherein the pixel defining layer comprises the preparation material of claim 1; and filling a pixel layer material solution into a pixel region defined by the pixel defining layer, and drying to obtain a cured pixel layer.