Liquid crystal display device and method for producing liquid crystal display device

A method for producing a liquid crystal display device that includes a pair of substrates and a liquid crystal layer held between the pair of substrates, at least one of the substrates including an electrode, and the liquid crystal layer having negative dielectric anisotropy, the method comprising, in sequence:

• a step of applying a silane coupling agent to a surface of each of the pair of substrates, thereby forming a silane coupling layer on the surface of each of the pair of substrates;
• a step of filling a liquid crystal composition having negative dielectric anisotropy between the pair of substrates, the liquid crystal composition containing liquid crystal molecules and at least two monomers;
• a step of annealing the pair of substrates and the liquid crystal composition;
• and
• a step of irradiating the liquid crystal composition with light, thereby polymerizing the at least two monomers to form a polymer layer on a surface of the silane coupling layer, the polymer layer being configured to vertically align adjacent liquid crystal molecules,
• wherein the at least two monomers contain a monofunctional monomer represented by the chemical formula (1):
• wherein in the formula (1), X represents an acrylate group, a methacrylate group, an ethacrylate group, a vinyl group, or an allyl group;
• m represents an integer of 0 to 4;
• a represents 0 or 1;
• b represents 0 or 1;
• and R represents an alkyl group having 1 to 20carbon atoms, and
• a bifunctional monomer represented by the chemical formula (2):
• P1-A1-(Z1-A2)n-P2 (2)
• wherein in the formula (2), P1 and P2 are the same or different and each represent an acrylate group, a methacrylate group, a vinyl group, a vinyloxy group, or an epoxy group;
• A1 and A2 each represent a phenanthrene-2,7-diyl group;
• a hydrogen group may be replaced with a halogen group, a methyl group, an ethyl group, or a propyl group, and carbon atoms of the benzene ring may be replaced to form a heterocyclic ring;
• Z1 represents COO, OCO, O, or direct bonding between A1 and A2 or between A2 and A2;
• and n represents 0, 1, or 2.