| 摘要 |
An improved back light module that the special design of light guide plate can prevent from the non-uniform of illumination. The module includes a light source; a reflector below the light source to reflect back the downward light rays for increasing the illumination of the back light module; and a light guide plate above said light source that a first portion of the bottom surface of said light guide plate, which is over said light source, is a plane and a second portion of the bottom/top surface of said light guide plate, which is not over said light source, has a plurality of regular bumps/recesses for focusing the light rays to increase the illumination, wherein said first portion and said second portion are arranged alternately in order.
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