Dr. Michel C.J.M. Vissenberg Profile

Dr. Michel C.J.M. Vissenberg

at Koninklijke Philips NV

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PROCEEDINGS ARTICLE | September 29, 2004

Light recycling for light-valve-projection with sparkling video

Proc. SPIE. 5529, Nonimaging Optics and Efficient Illumination Systems

KEYWORDS: Optical filters, Mirrors, Polarization, Video, Lamps, Reflectivity, LCDs, Projection systems, Optical resonators, CRTs

Read Abstract

In recent years, several architectures have been proposed for projection systems with an improved light efficiency by means of color recycling and/or polarization recycling. The recycling of light takes place in a rod integrator where light is coupled in from the lamp through a small hole in an entrance mirror. At the exit of the integrator, light of the wrong polarization state and/or wrong color is reflected back such that, after a round trip in the integrator, the light has a second chance of passing through the exit with a different polarization state or through a different color filter. Besides for recycling light of the wrong color or polarization, the integrator may also be used for recycling the unused light of pixels that are in a dark state. This allows for an increased brightness of bright parts in a dark scene, the so-called sparkling effect known from CRTs. We analyze the combined effects of color, polarization, and dark pixel recycling, extending the models previously proposed by Duelli et al. and by Zwanenburg.

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