Patent ID: 8580357
Filing Date: 2013-11-12
Classification: C09K,G02F

Abstract:
1. A liquid crystal display device, comprising: a pair of substrates, at least one of which is transparent; a liquid crystal layer placed between the pair of substrates; an electrode group, formed on at least one of the pair of substrates, for applying an electric field to the liquid crystal layer; and an alignment control film placed on at least one of the pair of substrates, wherein the alignment control film is formed of polyimide and a precursor of the polyimide, each of the polyimide and the precursor of the polyimide being obtained from a cyclobutanetetracarboxylic acid dianhydride derivative represented by the following chemical formula (1) and aromatic diamine as reactants, and the alignment control film is provided with alignment capability by photo-alignment treatment: where at least one of Z 1 to Z 4 is a substituent represented by —NR 2 , —SR, —OH, —(CH 2 ) n —COOR, —CN, or —NO 2 (R's each independently represent a hydrogen atom or an alkyl group having a carbon number of 1 to 4, and n represents an integer of 0 to 2), and the others are hydrogen atoms.