Design of freeform lens for uniform illumination in direct-lit LED backlight

摘要：

　　In this study,a freeform lens was designed for uniform illumination in direct-lit light emitting diode (LED) backlight with high distance-height ratio (DHR) based on the definition of illuminance.The principle and algorithms of the design method were introduced and several design examples were presented and discussed.Compared with traditional hemispherical lens,the freeform lens designed by the present method can improve the illuminance uniformity greatly,especially when the DHR is large.Monte Carlo simulations show that when the DHR is 3,the uniformity of lighting performance of the optimized freeform lens could be improved as high as 0.8788 while that of the traditional hemispherical lens is only 0.1417.

关键词： LED backlight Freeform Lens Nonimaging Optics

作者: Run Hu Huai Zheng Kai Wang Sheng Liu Xiaobing Luo

作者单位: School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074

会议类型: 国际会议

会议名称: 9th China International Forum on Solid State Lighting(第九届中国国际半导体照明论坛)

会议地点: 广州

会议语种:英文

页码: 307-311

在线出版日期: 2012-11-05（万方平台首次上网日期，不代表论文的发表时间）