基于白光LED侧入式背光结构,设计了多光源四边入射、导光板厚度为4 mm、对角线为1.066 8 m 的液晶背光模组,采用导光板底面印刷网点的方法导出光线.针对大尺寸导光板网点设计复杂、计算机辅助设计中光线模拟耗时的缺点,采用简化的光源仿真模型,减少了仿真计算时间,网点在实际模型下依然有效;同时采取了网点自动优化技术,通过优化使导光板的效率和均匀度达到最理想的状态,亮度均匀度达到了90%,光能利用效率在50%左右.采用相同方式设计了对角线为1.422 4 m的液晶背光模组,亮度均匀度可达90%,光能利用率在50%左右,总耗时1h,较普通方法减少了优化时间.
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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