PHOTOALIGNMENT POLYMER, ALIGNMENT LAYER AND LIQUID CRYSTAL RETARDATION FILM COMPRISING THE SAME

摘要

The present invention relates to a photoalignment polymer which can be desirably applied to an alignment layer or the like of a stereoscopic display device because an alignment direction according to a polarization direction can be easily changed. The present invention also relates to an alignment layer and a liquid crystal retardation film comprising the photoalignment polymer. The photoalignment polymer comprises a cyclic olefin-based repeating unit substituted with one or more photoreactive functional groups. The photoalignment polymer has an absorption rate (AR) of 0.02 or higher defined by a specific formula when primary photoalignment is performed by radiating first polarized UV light having a wavelength of 280 to 315nm and a first polarization direction in the total quantity of light of 60 mJ/cm2 or less, and secondary photoalignment is performed by radiating second polarized UV light having a wavelength of 280 to 315nm and a second polarization direction which is changed by 90°from the first polarization direction in the total quantity of light of 60 mJ/cm2 or less. [Reference numerals] (AA) Liquid crystal; (BB) Alignment layer; (CC) Substrate