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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S4 — Jul. 4, 2011
  • pp: A830–A840

New reversing design method for LED uniform illumination

Kai Wang, Dan Wu, Zong Qin, Fei Chen, Xiaobing Luo, and Sheng Liu  »View Author Affiliations

Optics Express, Vol. 19, Issue S4, pp. A830-A840 (2011)

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In light-emitting diode (LED) applications, it is becoming a big issue that how to optimize light intensity distribution curve (LIDC) and design corresponding optical component to achieve uniform illumination when distance-height ratio (DHR) is given. A new reversing design method is proposed to solve this problem, including design and optimization of LIDC to achieve high uniform illumination and a new algorithm of freeform lens to generate the required LIDC by LED light source. According to this method, two new LED modules integrated with freeform lenses are successfully designed for slim direct-lit LED backlighting with thickness of 10mm, and uniformities of illuminance increase from 0.446 to 0.915 and from 0.155 to 0.887 when DHRs are 2 and 3 respectively. Moreover, the number of new LED modules dramatically decreases to 1/9 of the traditional LED modules while achieving similar uniform illumination in backlighting. Therefore, this new method provides a practical and simple way for optical design of LED uniform illumination when DHR is much larger than 1.

© 2011 OSA

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(220.4298) Optical design and fabrication : Nonimaging optics

ToC Category:
Light-Emitting Diodes

Original Manuscript: April 8, 2011
Revised Manuscript: May 25, 2011
Manuscript Accepted: June 3, 2011
Published: June 13, 2011

Kai Wang, Dan Wu, Zong Qin, Fei Chen, Xiaobing Luo, and Sheng Liu, "New reversing design method for LED uniform illumination," Opt. Express 19, A830-A840 (2011)

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