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

A liquid crystal display device, comprising

• a pair of substrates,
• a liquid crystal layer disposed between the pair of substrates,
• an alignment film arranged on at least one of the pair of substrates, and
• a polymer layer arranged on the alignment film and controlling the alignment of liquid crystal molecules which are adjacent to the polymer layer,
• wherein the polymer layer is formed by polymerization of two or more kinds of monomers added in the liquid crystal layer, and
• at least one of the two or more kinds of monomers is a first monomer, the first monomer being polymerizable upon exposure to visible light and represented by the following chemical formula (1):
• wherein A1 and A2 are each independently a benzene ring, a biphenyl ring, or a C1-C12 linear or branched alkyl or alkenyl group;
• at least one of A1 and A2 includes a -Sp1-P1 group;
• a hydrogen atom in A1 and A2 may be substituted with a -Sp1-P1 group, a halogen atom, a —CN group, a —NO2 group, a —NCO group, a —NCS group, a —OCN group, a —SCN group, a —SF5 group, or a C1-C12 alkyl, alkenyl, or aralkyl group, the alkyl or alkenyl group being linear or branched;
• two adjacent hydrogen atoms in A1 or A2 may be substituted with a C1-C12 linear or branched alkylene or alkenylene group to form a ring structure;
• a hydrogen atom in the alkyl, alkenyl, alkylene, alkenylene, or aralkyl group of A1 and A2 may be substituted with a -Sp1-P1 group;
• a —CH2— group in the alkyl, alkenyl, alkylene, alkenylene, or aralkyl group of A1 and A2 may be substituted with an —O— group, a —S— group, a —NH— group, a —CO— group, a —COO— group, a —OCO— group, a —O—COO— group, a —OCH2— group, a —CH2O— group, a —SCH2— group, a —CH2S— group, a —N(CH3)— group, a —N(C2H5)— group, a —N(C3H7)— group, a —N(C4H9)— group, a —CF2O— group, a —OCF2— group, a —CF2S— group, a —SCF2— group, a —N(CF3)— group, a —CH2CH2— group, a —CF2CH2— group, a —CH2CF2— group, a —CF2CF2— group, a —CH═CH— group, a —CF═CF— group, a —C≡C— group, a —CH═CH—COO— group, or a —OCO—CH═CH— group, provided that oxygen atoms, sulfur atoms and nitrogen atoms are mutually apart;
• P1 is a polymerizable group;
• Sp1 is a C1-C6 linear, branched, or cyclic alkylene or alkyleneoxy group, or a direct bond;
• m is 1 or 2;
• a dotted line connecting A1 and Y, and a dotted line connecting A2 and Y show an optional bond between A1 and A2 mediated by Y;
• and
• Y is a —CH2— group, a —CH2CH2— group, a —CH═CH— group, a —O— group, a —S—group, a —NH— group, a —N(CH3)— group, a —N(C2H5)— group, a —N(C3H7)— group, a —N(C4H9)— group, a —OCH2— group, a —CH2O— group, a —SCH2— group, a —CH2S— group, or a direct bond.