Patent ID: 8313814

Claim:
An optically-compensatory film incorporating a polarizing plate, which comprises: (A) a long polarizing film which has an absorption axis in parallel with a longitudinal direction; (B) a long second phase difference film which comprises a cellulose acylate that includes a substituent having a polarizability anisotropy Da represented by following Expression (1) of 2.5′ 10 −24 cm −3 or more that is an aromatic acyl group, and which has a retardation in a thickness-direction Rth of −300 to −40 nm and an in-plane retardation Re of 50 nm or less, wherein an optical axis is not included in an in-plane film, wherein the long second phase difference film consists of a single layer; and (C) a long first phase difference film which has a slow axis substantially orthogonal to a longitudinal direction, wherein the long first phase difference film is interposed between the long polarizing film and the long second phase difference film: Da=ax −( ay+az )/2 Expression (1) wherein, ax, ay and az are each a characteristic value obtained after diagonalization of polarizability tensor, and satisfy ax 3 ay 3 az, wherein the total substitution degree of an acyl group in the cellulose acylate film is 2.4 or more to 3.0 or less, and a substitution degree of the aromatic acyl group in the cellulose acylate film is 0.1 or more to 1.0 or less.