| 摘要 |
A backlight module includes a light guide plate, at least one point light source, and an optical film. The light guide plate has a light outputting surface and a light reflecting surface opposing to the light outputting surface. A plurality of dots are indented on the light outputting surface, and a plurality of grooves are formed parallel to each other on the light reflecting surface. The propagation directions of most of the emitting light rays of the point light source are substantially parallel to the direction of the grooves. The optical film is provided with refraction elements arranged in a direction perpendicular to the direction of the grooves.
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