| 摘要 |
A direct-type backlight device is provided with a reflecting plate, a plurality of dot-like light sources, and a light diffusing plate in this order. On a light emitting plane of the light diffusing plate, a fine uneven structure, i.e., a split image forming means, is arranged. The images (A1, B1, C1, D1) of the four dot-like light sources (A, B, C, D) among the dot-like light sources on the light emitting plane constitute a protruding rectangle which has the smallest area and the shortest circumference length. By the fine uneven structure, the images (A1, B1, C1, D1) are observed within a specific region (W) in a region surrounded by positions (A0, B0, C0, D0) where dot-like light sources (A, B, C, D) are projected on a light diffusing plate.
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