Patent ID: 9651828
Date: 2017-05-16
CPC Classifications: C09K,G02F

Claim:
1. A liquid crystal display device comprising a pair of substrates, a liquid crystal layer having a negative or positive dielectric constant anisotropy disposed between the pair of substrates, an alignment film formed on at least one of the pair of substrates, and a first polymer layer for controlling the alignment of liquid crystal molecules formed on the alignment film, wherein the first polymer layer is formed by polymerization of one or more species of monomers added in the liquid crystal layer, the alignment film is formed by subjecting a second polymer material to a photo-alignment treatment comprising exposure to polarized ultraviolet rays including a component with a wavelength of 300 nm or longer, the second polymer material containing a compound including a main chain that contains an imide structure and a side chain that contains a photoreactive functional group which includes at least one selected from the group consisting of a cinnamate group, a coumarin group, a chalcone group, a tolane group, and an azo benzene group, the main chain having an imidization ratio of more than 20% and less than 50%, wherein the alignment film is a vertical alignment film when the liquid crystal layer has a negative dielectric constant anisotropy, and the alignment film is a horizontal alignment film when the liquid crystal layer has a positive dielectric constant anisotropy; and the one or more species of monomers are condensed aromatic compounds represented by the following chemical formula (1): wherein P wherein a hydrogen atom in A