Photo-alignment materials for liquid crystal alignment film

摘要

Disclosed is a photo-alignment material for liquid crystal alignment film comprising a repeating unit represented by the following formula 1, or a repeating unit represented by the following formula 1 and at least one repeating unit selected from the group consisting of structures represented by the following formula 2, in which X is a hydrogen atom, fluorine atom, chlorine atom, or C1 SIMILAR 14 linear or branched alkyl group; Y is an oxygen atom or C2 SIMILAR 14 alkylene group; and R is a functional group. Liquid crystal display devices comprising such material have improved electrical and electroptical properties.