| 摘要 |
A sheet-like light source device comprising a plurality of bar-shaped light sources, a diffusing plate for diffusing light emitted from the light sources, and a reflecting plate capable of mirror reflecting the light emitted from the light sources to the diffusing plate side. The reflecting plate is provided in a position opposite to the diffusing plate with respect to the light sources. The reflecting plate has at least one convex portion formed in parallel with the light sources in a space between the two adjacent light sources. It is possible to decrease or remove shield printing which has conventionally carried out over the diffusing plate, thereby enabling manufacture of a back light having a high efficiency.
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