Abstract

Using freeform lenses to construct uniform illumination systems is important in light-emitting diode (LED) devices. In this paper, the energy feedback design is used for freeform lens (EFFL) constructions by solving a set of partial differential equations that describe the mapping relationships between the source and the illumination pattern. The simulation results show that the method can overcome the illumination deviation caused by the extended light source (ELS) problem. Furthermore, a uniformity of 95.6% is obtained for chip-on-board (COB) compact LED devices. As such, prototype LEDs manufactured with the proposed freeform lenses demonstrate significant improvements in luminous efficiency and emission uniformity.

© 2016 Optical Society of America

Freeform lens design for light-emitting diode uniform illumination by using a method of source–target luminous intensity mapping

Jin-Jia Chen, Ze-Yu Huang, Te-Shu Liu, Ming-Da Tsai, and Kuang-Lung Huang
Appl. Opt. 54(28) E146-E152 (2015)

Freeform LED lens for uniform illumination

Yi Ding, Xu Liu, Zhen-rong Zheng, and Pei-fu Gu
Opt. Express 16(17) 12958-12966 (2008)

Freeform surface lens for LED uniform illumination

Zheng Zhenrong, Hao Xiang, and Liu Xu
Appl. Opt. 48(35) 6627-6634 (2009)

New freeform lenses for white LEDs with high color spatial uniformity

Shuiming Li, Kai Wang, Fei Chen, and Sheng Liu
Opt. Express 20(22) 24418-24428 (2012)

Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating

Run Hu, Xiaobing Luo, Huai Zheng, Zong Qin, Zhiqiang Gan, Bulong Wu, and Sheng Liu
Opt. Express 20(13) 13727-13737 (2012)