Patent ID: 7630031

Claim:
An optical compensation film comprising: a cellulose acylate film having a thickness of 40 to 85 μm, the cellulose acylate film comprises cellulose having a glucose unit, wherein a hydroxyl group of the glucose unit is substituted with an acyl group having at least two carbon atoms, and the cellulose acylate film satisfies relations (I) and (II): 2.0 ≦DS 2 +DS 3 +DS 6≦3.0 (I) DS 6/( DS 2 +DS 3 +DS 6)≧0.315 (II) wherein DS2 stands for a substitution degree of the hydroxyl group at 2-position of the glucose unit with the acyl group, DS3 stands for a substitution degree of the hydroxyl group at 3-position of the glucose unit with the acyl group, and DS6 stands for a substitution degree of the hydroxyl group at 6-position of the glucose unit with the acyl group; and an optically anisotropic layer comprising a liquid crystalline compound.