| 摘要 |
A dot pattern of a light guide plate is optimally designed for a surface light source device of side light type. A lamp 1 is disposed at the side of the light guide plate 2 and light introduced from a light incidence surface into the light guide plate 2 is emitted from a luminous surface. The dot pattern is arranged on the rear surface of the light guide plate 2 according to the following principles: (1) there is a (gradient) portion where the rate of area occupation of the dot pattern increases from a region (usually a far region) lowly exposable to light from the lamp 1; and (2) there is no sharp variation in the rate of area occupation of the dot pattern. At a corner of the light guide plate 2, a substantially triangular dot pattern is disposed for compensating any luminance drop due to the location in the vicinity of an electrode portion 1a of the lamp 1.
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