Optical Components, Detectors, and Displays

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

[+] Author Affiliations
Hüseyin Murat

Ghent University, Department of Electronics and Information Systems, TFCG Microsystems Group, Technologie Park 914, B-9052 Ghent, Belgium

Dieter Cuypers, Herbert De Smet

Ghent University, Department of Electronics and Information Systems, TFCG Microsystems Group and Interuniversity MicroElectronics Center, Information Technology Division, Technologie Park 914, B-9052 Ghent, Belgium

Youri Meuret, Bart Van Giel, Lawrence Bogaert, Hugo Thienpont

Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Pleinlaan 2, B-1050 Brussels, Belgium

Opt. Eng. 46(12), 124002 (December 18, 2007). doi:10.1117/1.2822392
History: Received March 22, 2007; Accepted June 12, 2007; Published December 18, 2007
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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 étendue, 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 171lm projected D65 flux.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Hüseyin Murat ; Dieter Cuypers ; Herbert De Smet ; Youri Meuret ; Bart Van Giel, et al.
"Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination engine", Opt. Eng. 46(12), 124002 (December 18, 2007). ; http://dx.doi.org/10.1117/1.2822392


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