Patent ID: 8906474

Claim:
A liquid crystal display device comprising: a first substrate and a second substrate, at least one of which is transparent; a liquid crystal layer disposed between the first substrate and the second substrate; a group of electrodes for applying an electric field to the liquid crystal layer, which is formed on at least one of the first substrate and the second substrate; a plurality of active elements connected to the group of electrodes; and an alignment film disposed on at least one of the first substrate and the second substrate, wherein the alignment film contains a polyimide and a precursor of the polyimide, each of which is formed from a diamine and an acid anhydride, the diamine contains a first diamine having at least one acidic group and a second diamine having at least one nitrogen atom-containing basic functional group other than two amino groups, the second diamine is represented by the following chemical formula (2): H 2 N—Y—NH 2 , wherein Y is an at least divalent organic group which contains one to three nitrogen atoms, and contains a functional group selected from an amino group having a secondary amine structure (—NH—), a primary amide group (—CO—NH 2 ), and a secondary amide group (—CO—NH—) as the nitrogen atom-containing basic functional group, and in a case where the second diamine has an annulation in the molecule, the annulation is a benzene ring structure, and wherein the second diamine comprises at least one of the compounds represented by the following chemical formulae (B-7), (B-30) and (B-31): in which each n independently represents an integer of 0 to 8, and each R independently represents an alkyl group having 1 to 3 carbon atoms.