Patent ID: 9122103
Filing Date: 2015-09-01
Classification: B32B,C09K,G02F

Abstract:
1. A liquid-crystal display device comprising a pair of substrates each comprising an electrode and a photoalignment film, and a liquid crystal layer interposed between the pair of substrates, wherein the photoalignment film comprises a copolymer comprising a first monomer unit including a first side chain including a photoreactive functional group and a second monomer unit including a second side chain including a repeated structure, and the repeated structure is represented by the following formula (I), wherein A represents the composition ratio of the repeated unit of the repeated structure in the second side chain, and is any value of 0 to 1; and r represents the number of the repeated structure within the brackets, and is a positive integer equal to or greater than 10; wherein the macromolecular main chain of the copolymer is polyimide, or polyamic acid; wherein the copolymer includes a chemical structure represented by the following formula (III), wherein T represents the photoreactive functional group included in the first side chain of the first monomer unit; A represents the composition ratio of the repeated unit of the repeated structure in the second side chain of the second monomer unit, and is any value of 0 to 1; m represents the composition ratio of the second monomer unit in the copolymer, and is 0.2; r represents the number of the repeated structure within the brackets, and is a positive integer equal to or greater than 10; and n represents the polymerization degree, and is a positive integer.