| 摘要 |
An illumination device is formed from a light-transmissive light guide member, and a light source disposed on a side of the light guide member to emit light to the light guide member. The light guide member is formed to include an anisotropic grating preferably at a boundary between an anisotropic member having a refractive index anisotropy and a substantially non-anisotropic member laminated on the anisotropic member. The anisotropic grating may be formed as a one-dimensionally arranged grating for causing selective diffraction of, e.g., an ordinary ray. As a result, the illumination device is caused to function as a planar light source emitting linearly polarized light of a uniform luminance distribution suitably used in combination with a transmission-type or reflection-type liquid crystal device to form a small-sized and thin liquid crystal apparatus.
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