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Proceedings Paper

An LED multiplexer with improved efficiency
Author(s): Joshua Cobb
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Paper Abstract

Light emitting diodes (LED) have been increasingly used as light sources for projection display. LEDs have numerous advantages as a light source for these applications especially when used with a digital micro-mirror spatial light modulator such as the device offered by Texas Instruments. LEDs create an expanded color gamut, they can be modulated at very high rates (thus, eliminating the need for a color wheel), and they last longer than other light sources. One disadvantage they have is the luminous output is lower than would be desired for most front projection applications. Smaller pocket projectors have used the LED sources successfully, but the luminous output is limited to between 25 and 100 lumens. One of the areas of light loss in the illumination system is in the multiplexer that combines the three colored LEDs into a coaxial illumination beam. In this paper, this loss is quantified and an alternate multiplexer design is proposed.

Paper Details

Date Published: 23 September 2008
PDF: 5 pages
Proc. SPIE 7103, Illumination Optics, 710308 (23 September 2008); doi: 10.1117/12.801757
Show Author Affiliations
Joshua Cobb, Corning Inc. (United States)

Published in SPIE Proceedings Vol. 7103:
Illumination Optics
Tina E. Kidger; Stuart R. David, Editor(s)

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