OPTICAL FILM, POLARIZING PLATE EQUIPPED WITH THE OPTICAL FILM, PROCESS FOR MANUFACTURE OF THE POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

Provided is an optical film which does not undergo the deterioration in front contrast or contrast fluctuations even when used in a VA-type liquid crystal display device having high front contrast or as a polarizing plate protection film. The optical film comprises a cellulose ester resin having high stretching adequacy and having an average acetyl group substitution degree of 2.0-2.6, has a phase difference (Ro) of 30-100 nm, a phase difference (Rth) of 70-400 nm and a film thickness of 15-50 mum, and is characterized by fulfilling a requirement represented by formula (I). Formula (I): 0.01