22-34- - Polyimide Alignment Film from 22-Bis34-Dicarboxyphenyl-Hexafluoropropane Dianhydride and Ortho-Substituted Aromatic Diamines for Active Matrix Liquid Crystal Displays

摘要

2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride, which provides a high voltage holding ratio and high tilt angle when used in an active matrix liquid crystal display, and 2,3,5,6-tetramethyl there is provided a polyimide alignment film based on an ortho-substituted aromatic diamine such as p-phenylenediamine, 2,4,6-trimethyl-m-phenylenediamine and 1,5-diaminonaphthalene.