Design and fabrication of the concentric circle light guiding plate for LED-backlight module by MEMS technique

Generally, injection molding technique is applied to fabricate the traditional light guiding plate (LGP). MEMS and hot-embossing techniques applied to fabricate the concentric circle light guiding plate (CCLGP) in this research. The concentric circle v-groove structure and the micro-pyramid structure are constructed on the CCLGP. Therefore, the new backlight module could be simplified to use on only one integrated LGP with any optical components. The CCLGP can eliminate four optical components including the two diffusive sheets and two prism sheets in backlight module, so the space and the fabricated cost of the backlight unit are saved. From the test results, the CCLGP is demonstrated successfully of guide light function and the 82% of illuminative uniformity of the CCLGP is better than the other LGP.