Abstract
Adopting LED as the light source, LCD TV has significant advantages over adopting Cold Cathode Fluorescent Lamp (CCFL). Light guide plate (LGP) with a two-dimensional array of dots scheme is the key to the design of the LED backlight unit (BLU). A LED BLU with 1.066 8 m in diagonal and 4 mm in thickness, using incidence structure with four-side light sources is proposed in this paper. Considering the complexity and time-consuming process of the large scale LGP dot-pattern design, the method of simplified model is introduced which is the simplification of the LGP and the LEDs. The optimization result between the simplified model and the actual model can be ignored. The LGP luminance uniformity reaches up to 90% and the extraction efficiency is around 50%. Adopting the same method to a BLU with 1.422 4 m in diagonal and the thickness of 3 mm, it also achieved a good result. The luminance uniformity reaches 85% and the extraction efficiency is around 50%.
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