P‐187: Pretilt angle of liquid crystal molecules induced by photo‐aligned films of Polymerized 2‐(methacrylic acid) ethyl 3,5‐diaminobenzoic acid reaction monomer polyimide for PSVA technology

• Published in: SID International Symposium Digest of technical papers Vol. 55; no. 1; pp. 2096 - 2100
• Main Authors: Li, Ji, Li, Zhifu, Chen, Jie, Zhao, Yongchao, He, Binbin, Zhao, Ting, Lu, Shuang, Wang, Guozhong
• Format: Journal Article
• Language: English
• Published: Campbell Wiley Subscription Services, Inc 01.06.2024
• Subjects: Chemical synthesis; Copolymers; Crystal structure; Diamines; Dianhydrides; Ethyl esters; Inclination; Liquid crystal displays; Methacrylic acid; Methylene dianiline; Monomers; photo‐controlled orientation; Polyimide; Polymerization; Pretilt
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1002/sdtp.18017

Orientation film is a key material in liquid crystal displays, and the technology of inducing liquid crystal molecular orientation through polyimide photoorientation film is widely studied. In this work, polyimide is a random copolymer synthesized from a mixture of cyclobutanetetracarboxylic dianhydride and pyromellitic dianhydride, 4,4' ‐ diaminodiphenylmethane, 3,3', 5,5'‐ tetramethylbenzidine, and Methanone, bis (4‐aminophenyl) ‐, homopolymer. In this study, we investigated the pre‐inclination of a series of photo‐crosslinked diamine structures for the polymerization of RM monomers by PSVA (Polymer Stabilized Vertical Alignment) technology, and mainly investigated the pre‐inclination of a series of light‐oriented films with different molar fraction reaction monomers polymerized on the backbone. The results show that the polymerization of 2‐(methacrylate)ethyl ester 3,5‐diaminobenzoic acid reaction monomer with 6.3% molar fraction of polyimide photooriented film achieves high pre‐tilt adjustment under low light accumulation conditions, and successfully achieves excellent optical & reliability performance.