| 摘要 |
A transmittable display apparatus 1 comprises a liquid crystal display unit 2 and a plane light source unit 3 comprising a tubular light source 4, a light guide 5, and at least one anisotropic scattering sheet 7 disposed between the light guide and the display unit 2. An isotropic diffusing sheet, a prism sheet and an anisotropic scattering sheet may be disposed between the light guide and the display unit 2. In the light source unit 3, assuming that the axis-direction of the light source 4 is X-direction, the anisotropic scattering sheet is disposed with directing a main light-scattering direction of the sheet to Y-direction. In the display apparatus, the anisotropic scattering sheet is disposed in such a direction that a main light-scattering direction thereof is addressed to the horizontal direction of the display surface of the display unit. The anisotropic scattering sheet comprises a continuous phase (crystalline polypropylene) and a dispersed phase (noncrystalline copolyester, polystyrene) having the mean aspect ratio of more than 1, and these phases are different from each other in the refractive index. The anisotropic scattering sheet is capable of reducing the angle dependence on the luminance in a display surface of a transmittable liquid crystal display apparatus, even when the device comprises a tubular light source having anisotropy in the luminance distribution.
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