New collection systems for multi LED light engines

Autor: Jui-Wen Pan, Yeeu Chang Lee, Jenq Yang Chang, Sheng Han Tu, Chih Ming Wang
Rok vydání: 2009
Předmět:
Zdroj: Optical Review. 16:318-322
ISSN: 1349-9432
1340-6000
DOI: 10.1007/s10043-009-0058-8
Popis: Light emitting diodes (LEDs) have numerous advantages as light sources in projectors. LEDs are more compact, exhibit a larger color gamut, have a longer lifetime, and need a lower supply voltage. However, there is still one important disadvantage: the optical power per unit of etendue (luminance) of an LED is significantly low. As a result of the etendue limitations of LEDs, the projected flux on the screen will not be high. Despite this shortcoming, LED’s are still of great interest for low power applications because of their other superior properties. Thus we collect the available light flux optimally and combine multiple high luminance LEDs within the system. In this study we discuss three collection systems designed to collect the LED flux with high optical efficiency while retaining small device size. The best collection efficiency attained with our collection systems is 96%. The fabrication tolerance and cost of our collection systems are also analyzed.
Databáze: OpenAIRE
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