Patent ID: 8263732

Claim:
A photo-alignment film, which is formed by imidization after alignment of a polyamic acid generated using at least a diamine and a tetracarboxylic acid dianhydride as raw materials by light irradiation in a predetermined direction, wherein: the diamine comprises one or more diamines containing an unsaturated bond each represented by a general formula (1) described below as component A of the diamine; the tetracarboxylic acid dianhydride comprises one or more tetracarboxylic acid dianhydrides containing an unsaturated bond each represented by a general formula (2) described below as component A of the tetracarboxylic acid dianhydride; or the diamine comprises the one or more diamines containing unsaturated bonds as component A of the diamine, and the tetracarboxylic acid dianhydride comprises the one or two or more tetracarboxylic acid dianhydrides containing unsaturated bonds as component A of the tetracarboxylic acid dianhydride: H 2 N-A 1 -T-A 2 -NH 2 (1) where A 1 and A 2 each independently represent a divalent organic group, and T represents a divalent group comprising an unsaturated bond containing 1 to 3 carbon-carbon double bonds or 1 to 4 triple bond; where A 3 and A 4 each independently represent a trivalent organic group, and T represents a divalent group comprising an unsaturated bond containing 1 to 3 carbon-carbon double bonds or 1 to 4 triple bonds.