| 摘要 |
A backlight module ( 3 ) includes a light source ( 31 ), a light cover ( 32 ), and a light guide plate ( 33 ). The light guide plate includes an incident surface ( 333 ), an emitting surface ( 331 ), and a bottom surface ( 335 ) opposite to the emitting surface for scattering and reflecting the light beams input by the light source. The light beams are directed by the bottom surface to the emitting surface. A plurality of stairway-shaped protrusions ( 332 ) are uniformly located on the emitting surface. The stairway-shaped protrusions can efficiently improve the modulation transfer function of the light guide plate, and increase the brightness of the backlight module.
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