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Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination engine

Publication date 2007
B-Phot Authors Hugo Thienpont
DOI 10.1117/1.2822392
Citation
H. Murat et al., “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination engine,” Opt. Eng., vol. 46, no. 12, pp. 1–6, 2007.
Abstract LED-based projectors have numerous advantages compared to traditional projectors. They are more compact, they exhibit a larger color gamut and a longer lifetime, the supply voltage is lower and they can even operate on batteries. LEDs can switch rapidly (possibility to pulse) and they have a high dimming ratio (contrast considerations). However, they have low optical power per etendue, although this is also improving consistently. With an efficient illumination engine design we can build an LED projector with a moderate light output and with superior properties. We present a relatively compact LED projector with two liquid crystal on silicon (LCOS) light valves (LVs). One of these LVs alternately modulates red and blue information, while the other permanently modulates green information to achieve a good color balance. Additionally, we apply some methods to increase the brightness on the screen. Our two-LCOS approach results in a compact, efficient LED projector that produces 171 Im projected D65 flux. (c) 2007 Society of Photo-Optical Instrumentation Engineers.
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