Liquid crystal displays with an active matrix and polyimide orientation films based on 2,2 - to (3,4 - dicarboxylphenyl) hexa fluorine propane dianhydride and ortho - substituted diamines

摘要

A polyimide alignment film based on 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride and ortho-substituted aromatic diamines, such as 2,3,5,6-tetramethyl-p-phenylene diamine, 2,4,6-trimethyl-m-phenylene diamine and 1,5-diaminonaphthalene, providing high voltage holding ratio and high tilt angle when used in active matrix liquid crystal displays.