| 摘要 |
An optical sheet is constituted by: a retardation film; and a transparent layer provided on one of opposite surfaces of the retardation film. The retardation film exhibits Nz=(nx-nz)/(nx-ny) in a range of from 0.4 to 0.6, both not inclusively, and (nx-ny)d in a range of from 200 to 350 nm when nx>ny in which d is the thickness of the retardation film, nz, nx and ny are a refractive index in a direction of the thickness d of the retardation film, a refractive index in a direction of the retardation film in the same plane as the direction of nx, and a refractive index in a direction of the retardation film in the same plane as the direction of nx, respectively. The transparent layer has a thickness not larger than 10 mum and exhibits refractive index anisotropy of nx≈ny>nz.
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