Patent ID: 8647724

Claim:
A liquid crystal display device comprising: a pair of substrates; and a liquid crystal layer between the substrates, wherein at least one of the substrates comprises an alignment film and a polymer layer on the alignment film, the polymer layer comprises monomer units derived from at least two species of polymerizable monomers, the at least two species of polymerizable monomers include at least a first polymerizable monomer and a second polymerizable monomer, the first polymerizable monomer is a polyfunctional monomer represented by the formula (I-1): P 1 -S 1 -A 1 -(Z 1 -A 2 ) n -S 2 -P 2 (I-1) wherein P 1 and P 2 each represent a methacrylate group; A 1 and A 2 each represent a 1,4-phenylene group; Z 1 represents a direct bond between A 1 and A 2 , or A 2 and A 2 , n is 0, 1, or 2; S 1 and S 2 , which are the same or different, each represent (CH 2 ) m (1≦m≦6), (CH 2 —CH 2 —O) m (1≦m≦6) or a direct bond between P 1 and A 1 , A 1 and P 2 , or A 2 and P 2 ; and all or part of hydrogen atoms of A 1 and A 2 may be substituted with halogens and/or methyl groups; and the second polymerizable monomer which is different from the first polymerizable monomer is a polyfunctional monomers represented by the formula (I-2): P 1 -S 1 -A 1 -(Z 1 -A 2 ) n -S 2 -P 2 (1-2) wherein P 1 and P 2 , which are the same or different, each represent an acrylate group, methacrylate group, acrylamide group, methacrylamide group, vinyl group, vinyloxy group, or epoxy group; A 1 and A 2 each represent a napthalene-2,6-diyl group, anthracene-2,6-diyl group, phenanthrene-2,6-diyl group or 1,4-phenylene group; —Z 1 represents COO, OCO, O, CO, NHCO, CONH, S, or a direct bond between A 1 and A 2 , or A 2 and A 2 , n is 0, 1, or 2: S 1 and S 2 , which are the same or different, each represent (CH 2 ) m (1≦m≦6), (CH 2 —CH 2 —O) m (1≦m≦6) or a direct bond between P 1 and A 1 , A 1 and P 2 , or A 2 and P 2 ; and all or part of hydrogen atoms of A 1 and A 2 may be substituted with halogens and/or methyl groups.