Abstract
Light-emitting diode (LED) large-scale uniform rectangular illumination has a wide range of applications and is usually created by an irradiance superposition scheme. Abandoning the traditional method, we propose an approach to generate this illumination mode and enhance efficiency. With this method, an independent rectangular irradiance distribution is generated by each LED lens unit, and the large-scale illumination is obtained by arraying the irradiance distribution. Two slim direct-lit LED backlightings with a distance-height ratio of 3 were designed. An optical performance with irradiance nonuniformity less than 0.0228 and efficiency greater than 96% were obtained. Compared with the traditional methods, the efficiency is significantly enhanced and the number of the LED units is dramatically reduced by this new method.
©2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Kai Wang, Dan Wu, Zong Qin, Fei Chen, Xiaobing Luo, and Sheng Liu
Opt. Express 19(S4) A830-A840 (2011)
Peng Liu, Huihui Wang, Rengmao Wu, Yang Yang, Yaqin Zhang, Zhenrong Zheng, Haifeng Li, and Xu Liu
Appl. Opt. 52(17) 3998-4005 (2013)
Zhouping Su, Donglin Xue, and Zhicheng Ji
Opt. Express 20(S6) A843-A855 (2012)