[1] DING Y, LIU X, ZHENG Z R. Freeform LED lens foruniform illumination［J］. Optics Express, 2008, 16(17): 12958-12966.

[2] SU Zhou-ping, QUE Li-zhi, ZHU Zhuo-wei. Optic al system design of the compact collimator for LED source［J］. Laser & Optoelectronics Progress, 2012, 49(2): 022203.

[3] SUN C C, CHEN C Y, HE H Y. Precise optical modeling for silicate-based white LEDs［J］. Optics Express, 2008, 16: 20060.

[4] SUN C C, CHIEN W T, MORENO I. Analysis of the far-field region of LEDs［J］. Optics Express, 2009, 17(12): 13918-13922.

[5] WANG K, LIU S, CHEN F, et al. Freeform LED lens for rectangularly prescribed illumination［J］. Journal of Optics A-Pureand Applied Optics, 2009, 11(10): 105501-105505.

[6] DING Yi, GU Pei-fu. Freeform reflector for uniform illumination［J］. Acta Optica Sinica, 2007, 27(3): 540-544.

[7] DING Yi, ZHENG Zhen-rong, GU Pei-fu. Freeform lens design foe LED illumination［J］. Acta Photonica Sinica, 2009, 38(6): 1486-1490.

[8] LUO Xiao-xia, LIU Hua, LU Zhen-wu, et al. Automated optimization of free-form surface lens for LED collimation［J］. Acta Photonica Sinica, 2011, 40(9): 1351-1355.

[9] WHANG A J W, CHEN Y Y, TENG Y T. Designing uniform illuminance systems by surface-tailored lens and configurations of LED arrays［J］. Journal of Dispersion and Technology, 2009, 5: 94-103.

[10] QIN Z, WANG K, CHEN F. Analysis of condition for uniform lighting generated by array of light emitting diodes wit large view angle［J］. Optics Express, 2010, 18: 17460-17476.

[11] SU Zhou-ping, XUE Dong-lin, JI Zhi-cheng. Designing LED array for uniform illumination distribution by simulated annealing algorithm［J］. Optics Express, 2012, 20(S6): 843-855.

[12] WANG Jia-wen, SU Zhou-ping, YUAN Zhi-jun, et al. Study on uniformity of LED array illumination distribution on target plane［J］. Acta Photonica Sinica, 2014, 43(6): 919-924.

[13] ZHAO Zhi-pu, JI Ling-yan, SHEN Yan-xia, et al. Research of illumination uniformity for LED arrays based on PSO algorithm［J］. Chinese Journal of Luminescence, 2013, 34(12): 1677-1681.