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11 September 2006 Luminance enhancement of LED light sources for etendue-limited applications
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In LED projection displays, total lumen-output equals the source-luminance multiplied by the etendue of the spatial light modulator, the latter being a bottleneck that cannot be overcome. In addition, the luminance of existing LED sources is still too low for many projection-display applications. This has spurred research into finding ways to increase their brightness without a significant loss in efficacy. Current techniques to increase LED source-luminance include: (a) a photonic lattice atop the LED, which partially collimates the exiting light though lowering the efficacy (by Luminus), (b) recycling the LED light through the chip via TIR on a flat cover rather than a dome (several LED suppliers), and (c) a light-confining box with an exit aperture smaller than the chip (GoldenEye). All the above mentioned existing approaches achieve an increase in luminance for the LEDs at the expense of a considerable drop in efficacy. In this paper we present four novel and different ways (patent pending) to considerably enhance LED luminance and offering the possibility of having relatively high efficacy.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Julio Chaves, Waqidi Falicoff, Pablo Benitez, Juan Carlos Miñano, William A. Parkyn, and Oliver Dross "Luminance enhancement of LED light sources for etendue-limited applications", Proc. SPIE 6338, Nonimaging Optics and Efficient Illumination Systems III, 63380L (11 September 2006);


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