| 摘要 |
Several optical mechanism designs for making luminance of the outer portion of a back light module to become higher than luminance of the inner portion of the back light module of the direct lighting type are disclosed in accordance with the present invention. The disclosed optical mechanism designs can be cooperated with each other to enhance the optical effect of the back light module. Additionally, the back light modules of the present invention are feasible for utilization in various scanners or liquid crystal displays.
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