Patent ID: 8896789

Claim:
An optical film comprising a transparent film having a thickness of 10 μm to 150 μm, an alignment layer which is formed on one surface of the transparent film, and a retardation layer comprising a liquid-crystalline compound, in this order, on the transparent film, and comprising at least one hard coat layer on the other side of the transparent film, wherein values of in-plain mean refractive indices thereof satisfy the formula: the retardation layer comprising a liquid-crystalline compound>the alignment layer>the transparent film; the difference in in-plane mean refractive indices between the alignment layer and the retardation layer comprising a liquid-crystalline compound and the difference in in-plane mean refractive indices between the alignment layer and the transparent film are each 0.02 or more; and the optical thickness D of the alignment layer satisfies the formula: 270 ×N− 150-75 nm≦ D≦ 270 ×N− 150+75 nm(1 ≦N≦ 8 where N is a natural number).