| 摘要 |
An optical film in which at least one layer of a cholesteric liquid crystal layer (1) and a retardation layer (2) are laminated, wherein an in-plane retardation of the retardation layer (2): (nx1-ny1)xDre is 5 nm or less, and a virtual thickness direction retardation: RZch, and a thickness direction retardation: RZre have a relationship of RZre/(-RZch)=0.05 through 0.35, can be used as a brightness enhancement film, and further that provides an excellent visibility satisfactory also when observed not only from a front direction but from an oblique direction in image viewing displays, such as liquid crystal displays.
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