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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 13 — May. 1, 2013
  • pp: 2985–2993

Integral freeform illumination lens design of LED based pico-projector

Shuang Zhao, Kai Wang, Fei Chen, Zong Qin, and Sheng Liu  »View Author Affiliations

Applied Optics, Vol. 52, Issue 13, pp. 2985-2993 (2013)

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In this paper, an illumination lens design for a LED-based pico-projector is presented. Different from the traditional illumination systems composed by lens group, the integral illumination lens consists of a total internal reflector (TIR) and a freeform surface. TIR acts as collimation lens and its top surface formed by a freeform surface reshapes the nonuniform circular light pattern generated by TIR to be rectangular and uniform. Diameter and height of the lens are 16 and 10 mm, respectively. An optimization method to deal with the problem of extended light source is also presented in detail in this paper. According to the simulation results of the final optimized lens, 77% (neglecting the effect of polarization) of the power of light source is collected on liquid crystal on silicon panel with a 16 9 ratio and illumination uniformity achieves 92% .

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(080.4298) Geometric optics : Nonimaging optics

ToC Category:
Optical Design and Fabrication

Original Manuscript: January 25, 2013
Revised Manuscript: March 23, 2013
Manuscript Accepted: March 23, 2013
Published: April 24, 2013

Shuang Zhao, Kai Wang, Fei Chen, Zong Qin, and Sheng Liu, "Integral freeform illumination lens design of LED based pico-projector," Appl. Opt. 52, 2985-2993 (2013)

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  1. X. J. Yu, Y. L. Ho, L. Tan, C. Ho, and S. Hoi, “LED-based projection systems,” J. Disp. Technol. 3, 295–303 (2007). [CrossRef]
  2. B. A. Jacobson, and R. D. Gengelbach, “Beam-shape transforming devices in high-efficiency projection systems,” Proc. SPIE 3139, 141 (1997). [CrossRef]
  3. J. W. Pan, C. M. Wang, H. C. Lan, W. S. Sun, and J. Y. Chang, “Homogenized LED-illumination using microlens arrays for a pocket-sized projector,” Opt Express 15, 10483–10491 (2007). [CrossRef]
  4. J. Bortz, B. Shatz, and D. Pitou, “Optimal design of a nonimaging projection lens for use with an LED source and a rectangular target,” Proc. SPIE 4092, 130–138 (2000). [CrossRef]
  5. L. Wang, K. Y. Qian, and Y. Luo, “Discontinuous free-form lens design for prescribed irradiance,” Appl. Opt. 46, 3716–3723 (2007). [CrossRef]
  6. Y. Ding, X. Liu, Z. R. Zheng, and P. F. Gu, “Freeform LED lens for uniform illumination,” Opt. Express 16, 12958–12966 (2008). [CrossRef]
  7. W. Z. Zhang, X. Y. Li, Q. X. Liu, and F. H. Yu, “Compact LED based LCOS optical engine for mobile projection,” Proc. SPIE 7506Y, 75061Y (2009). [CrossRef]
  8. P. Goldstein, “Radially symmetric freeform lens design for extended sources,” Proc. SPIE 8487, 84870C (2012). [CrossRef]
  9. F. R. Fournier, W. J. Cassarly, and J. P. Rolland, “Designing freeform reflectors for extended source,” Proc. SPIE 7423, 742302 (2009). [CrossRef]
  10. W. A. Parkyn, and D. G. Pelka, “New TIR lens applications for light-emitting diodes,” Proc. SPIE 3139, 135–140 (1997). [CrossRef]
  11. W. A. Parkyn, and D. G. Pelka, “TIR lenses for fluorescent lamps,” Proc. SPIE 2538, 93–103 (1995). [CrossRef]
  12. K. Wang, X. B. Luo, Z. Y. Liu, B. Zhou, Z. Y. Gan, and S. Liu, “Optical analysis of an 80 W light-emitting diode street lamp,” Opt. Eng. 47, 013002 (2008). [CrossRef]
  13. L. Piegl, and W. Tiller, The NURBS Book, 2nd ed. (Springer, 1996).
  14. K. Wang, F. Chen, Z. Y. Liu, X. B. Luo, and S. Liu, “Design of compact freeform lens for application specific light-emitting diode packaging,” Opt. Express 18, 413–424 (2010). [CrossRef]

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