LIQUID CRYSTAL ALIGNMENT FILM, METHOD FOR PRODUCING THE SAME, SUBSTRATE AND DISPLAY DEVICE
申请人:BOE TECHNOLOGY GROUP CO., LTD.
公开号:US20210207031A1
公开(公告)日:2021-07-08
The present disclosure discloses a liquid crystal alignment film, a method for producing the same, a substrate, and a display device. The liquid crystal alignment film includes a polyimide having a fluorine-containing group, wherein the polyimide is polymerized from dicarboxylic anhydride containing one or more fluorine atoms, a C
12-20
monoamine and a diamine. The introduction of the long flexible chain and the fluorine-containing group allow the pretilt angle of the polyimide synthesized by the present disclosure to reach 3° to 5°, and the introduction of fluorine element remarkably improves the transmittance of the synthesized polyimide and decreases water absorption. The modified fluorine-containing long flexible chain polyimide material prepared may be used in a liquid crystal alignment film of TFT-LCD, and enhance light transmittance, thermal stability, chemical stability, adhesion, etc. of the liquid crystal alignment film, thereby avoiding related defects caused by polyimide materials.