Optical compensatory sheet consisting of one cellulose acetate film

摘要

A liquid crystal display can be optically compensated by only one cellulose acetate film. The film comprises cellulose acetate and an aromatic compound having at least two aromatic rings. The cellulose acetate has an acetic acid content in the range of 59.0 to 61.5%. The aromatic compound is contained in the film in an amount of 0.01 to 20 weight parts based on 100 weight parts of the cellulose acetate. The film gives an Re retardation value of 20 to 70 nm and an Rth retardation value of 70 to 400 nm.