[1] [1] Hu Run, Luo Xiaobing, Zheng Huai, et al.. Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating[J]. Opt Express[J]. 2012, 20(13): 13727-13737.

[2] [2] Whang Allen Jong- Woei, Yiyung Chen, Yuanting Teng. Designing uniform illumination systems by surface- tailored lens and configurations of LED arrays[J]. Journal of Display Technology, 2009, 5(3): 94-103.

[3] [3] Luo Yi, Feng Zexing, Han Yauju, et al.. Design of compact and smooth free-form optical system with uniform illuminance for LED source[J]. Opt Express, 2010, 18(9): 9055-9063.

[4] [4] Ding Yi, Liu Xu, Zheng Zhenrong, et al.. Freeform LED lens for uniform illumination[J]. Opt Express, 2008, 16(7): 12958-12966.

[5] [5] R. F. Rykowski, C. B. Wooley. Source modeling for illumination design[C]. SPIE, 1997, 3130, 204-208.

[6] [6] Roland Winston, Juan C. Minano, Pablo G. Benitez, et al.. Nonimaging Optics [M]. Amsterdom: Elsevier Academic Press, 2005. 185-190.

[7] [7] Qian KeYuan, Ma Jun, Fu wei, et al.. Research on scattering properties of phosphor for high power white light emitting diode based on Mie scattering theory[J]. Acta Phys Sin, 2012, 61(20): 204201.

[8] [8] Wang Kai, Wu Dan, Chen Fei, et al.. Angular color uniformity enhancement of white light emitting diodes integrated with freeform lenses[J]. Opt Lett, 2010, 35(11): 1860-1862.

[9] [9] Liu Zhibin, Qian Keyuan, Luo Yi. Influence of phosphor layers with different shapes on white LED′s CCT uniformity in Space[J]. Semiconductor Optoelectronics, 2012, 33(5): 651-655.

[10] [10] D. R. Jenkins, H. Monch. Source imaging goniometric method of light source characterization for accurate projection system design [J]. SID Symposium Digest of Technical Papers, 2000, 31(1): 862-865.

[11] [11] Luo yi, Zhang Xianpeng, Wang Lin, et al.. Non-imaging optics and its application in solid state lighting[J]. Chinese J Lasers, 2008, 35(7):963-971.

[12] [12] Zheng Jinbo, Qian, Keyuan. Designing single LED illumination distribution for direct-type backlight[J]. Appl Opt, 2013, 52(28): 7022-7027.

[13] [13] Lai Liping, Zhuang Qiren, Liang Dejuan, et al.. Investigation of uniform illumination of the near-field on the lateral panels using LED projectors[J]. Acta Optica Sinica, 2014, 34(3): 0322002.

[14] [14] Xin Di, Liu Hua, Lu Zhenwu, et al.. Optical design of the LED illumination system with adjustable view angle[J]. Acta Optica Sinica, 2013, 33(5): 0522003.

[15] [15] Cheng Zhiming, Zeng Ping, Zhang Zhihai, et al.. Research on multi-direction collimation beam on the plane parallel with LED lighting[J]. Acta Optica Sinica, 2014, 34(10): 1008001.