Patent ID: 7981489

Claim:
An optical compensation sheet, comprising a cellulose acylate film that contains 1 to 20 parts by mass of a retardation controlling agent, to 100 parts by mass of a cellulose acylate, wherein the retardation controlling agent comprises at least two compounds different in Re/Rth ratios from each other; wherein one of the at least two compounds contained in the retardation controlling agent is selected from the group consisting of formulas (I), (II) and (IV) and exhibits a Re/Rth ratio of less than 0.35, and the other is selected from the group consisting of formulas (III) and (IV) and exhibits a Re/Rth ratio of not less than 0.35; wherein in Formula (I), X 1 represents a single bond, —NR 4 —, —O—, or —S—; X 2 represents a single bond, —NR 5 —, —O—, or —S—; X 3 represents a single bond, —NR 6 —, —O—, or —S—; R 1 , R 2 and R 3 each independently represent an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group; and R 4 , R 5 and R 6 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group; Ar 1 -L 1 Ar 2 -L 2 n Ar 3 Formula (II) wherein in Formula (II), Ar 1 , Ar 2 , and Ar 3 each independently represent an aryl group or an aromatic heterocyclic group; L 1 and L 2 each independently represent a single bond or a divalent linking group; n represents an integer of 3 or more; and a plurality of the Ar 2 moieties may be the same or different, and a plurality of the L 2 moieties may be the same or different; Ar 11 -L 12 -X-L 13 -Ar 12 Formula (III) wherein in Formula (III), Ar 11 and Ar 12 each independently represent an aromatic group; L 12 and L 13 each independently represent a divalent linking group selected from the group consisting of an alkylene group, —O—, —CO—, and a combination thereof; and X represents 1,4-cyclohexylene, vinylene, or ethynylene; wherein in Formula (IV), R 4 , R 5 , R 6 , R 7 , R 8 , and R 9 each independently represent a hydrogen atom or a substituent.