LIQUID CRYSTAL ALIGNING AGENT FOR PSA MODE LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL ALIGNMENT FILM FOR PSA MODE LIQUID CRYSTAL DISPLAY DEVICE, AND THE PSA MODE LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

摘要

Provided is a liquid crystal display device in a PSA mode with fast response speed capable of showing a proper pretilt angle with small optical irradiation amount and maintaining a high voltage maintenance ratio after optical irradiation. A liquid crystal alignment agent for forming a liquid crystal alignment film in the liquid crystal display device in the PSA mode comprises: a compound (A) having a structure (a) capable of performing one or more functions among a radical generation function which generates radical by the optical irradiation and an optical increase function which shows an increase action by the optical irradiation.