| 摘要 |
A planar light source device has a linear light source, a light guide plate for guiding light from the linear light source through the whole plane thereof, a lamp reflector for reflecting light from the linear light source in the direction of the light guide plate, an optical sheet positioned on the light output face of the light guide plate, and a frame member for regulating the positions of the linear light source, the light guide plate, the lamp reflector and the optical sheet. The position of the optical sheet in the planar direction is regulated by the side face portion of a protruding section formed in a portion of the frame member. Consequently, it is possible to regulate a position of an optical sheet by means of a simple structure.
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