| 摘要 |
A planar light source device of the present invention includes a light guide plate and a plurality of light-emitting diodes. The light guide plate includes a plurality of plate-form light guide members whose side surfaces are formed in a serrated shape. The serrated-shaped side surfaces of adjacent light guide members are connected in a planar direction so as to be engaged with each other. The plurality of light-emitting diodes emit light toward each of the light guide members. With this configuration, it is possible to securely prevent irregularity of brightness, when changing the luminance in the display screen in unit of blocks.
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