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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN 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)
http://dx.doi.org/10.1364/AO.52.002985


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Abstract

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

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

Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-13-2985

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