Patent ID: 7410679

Claim:
An optical compensation sheet comprising a cellulose acylate film having optical anisotropy and satisfying expressions (1) to (3), 2.6 ≦X+Y ≦3.0 Expression (1) 1.0 ≦X ≦1.8 Expression (1) 1.0 ≦Y ≦3.0 Expression (1) wherein X represents a substitution degree of acetyl group and Y represents a total sum of substitution degrees of propionyl, butanoyl, pentanoyl and hexanoyl groups; and an optically anisotropic layer having a slow axis orthogonal to a slow axis of the cellulose acylate film, wherein the optical compensation sheet has retardations satisfying the following relations (3) and (4); 5 <Re (749)− Re (446)>100 (3) 5 <Rth (446)− Rth (749)>100 (4) wherein Re(λ) is an in-plane retardation by nm at a wavelength of λ nm; and Rth(λ) is a thickness-direction retardation by nm at a wavelength of λ nm.