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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 5, Iss. 3 — Mar. 1, 2009
  • pp: 104–108

Guiding Light From LED Array Via Tapered Light Pipe for Illumination Systems Design

Allen Jong-Woei Whang, Pei-Chun Li, Yi-Yung Chen, and Sheng-Liang Hsieh

Journal of Display Technology, Vol. 5, Issue 3, pp. 104-108 (2009)


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Abstract

In illumination systems, it is often necessary to get a structure that can have good performance on uniformity. Although light-emitting diodes (LEDs) are replacing conventional light sources in illumination systems, they have nonuniformity and a large view angle. In this paper, an LED illumination system has been designed that can use color sequential to replace the color wheel for projector and also can mix color to get the color you want. An optical element tapered light pipe is also used in this structure, and we investigate the mechanism of irradiance distribution. It assists in the design of light pipe for different applications. The efficiency is above 80% and the uniformity is better than 60%. The formation of irradiance distribution in the tapered light pipe is discussed, both analytically and numerically. The result of the simulation verifies that efficiency of this structure is well enough for the illumination of both car headlights and interior lighting. This illumination system also provides a good color-mixing effect that can replace arc lamps or fluorescent lamps.

© 2009 IEEE

Citation
Allen Jong-Woei Whang, Pei-Chun Li, Yi-Yung Chen, and Sheng-Liang Hsieh, "Guiding Light From LED Array Via Tapered Light Pipe for Illumination Systems Design," J. Display Technol. 5, 104-108 (2009)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-5-3-104


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References

  1. K. Li, S. Inatsugu, "Etendue efficient coupling of an array of LEDs for projection display," Proc. SPIE (2005) pp. 36-40.
  2. M. Keuper, G. Harbers, S. Paolini, "RGB LED illuminator for pocket-sized projectors," SID 2004 Dig. of Papers (2004) pp. 943-945.
  3. K. Li, S. Inatsugu, S. Sillyman, "Design and optimization of tapered light pipes," Proc. SPIE (2004) pp. 48-57.
  4. Y.-K. Cheng, J.-L. Chern, "Irradiance formations in hollow straight light pipes with square and circular shapes," Opti. Soc. Amer. 23, 427-434 (2006).
  5. D. B. Cross, S. Inatsugu, Off-axis application of concave spherical reflectors as condensing and collecting optics U.S. Patent 4 757 431 (1988).
  6. F. Zhao, N. Narendran, J. Van Derlofske, "Optical elements for mixing colored LEDs to create white light," Proc. SPIE 4776, 206-214 (2002).

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