| 摘要 |
Provided is a backlight unit which includes a frame-shaped chassis, a light guide plate, a light source, a photodetector, and a shield plate. The light guide plate is disposed inside the chassis. The light source is disposed on one edge face of the light guide plate, and a photodetector for detecting light leaked out of the other edge face is disposed on the other edge face of the light guide plate opposed to the light source. A shield plate is disposed at the side of the back surface of the light guide plate, and both the light guide plate and the photodetector are fastened to the shield plate.
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