Reflective lcd projection system using wide-angle cartesian...

G - Physics – 02 – B

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G02B 27/28 (2006.01) G02B 5/30 (2006.01) H04N 9/31 (2006.01)

Patent

CA 2387982

An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/# <= 2.5, and at least one reflective light valve. The Cartesian polarizing beam splitter (PBS) has a structural orientation defining fixed polarization axes. The use of a Cartesian PBS allows the development of systems using curved PBS that provide higher light output and/or replace or augment other optical components. By recognizing and advantageously applying properties of wide-angle Cartesian polarizers, the present invention discloses a high-efficiency optical imaging system capable of functioning at f/#'s equal to or below f/2.5 while maintaining a contrast ratio of at least 1200 to 1, or, more preferably, 150 to 1 in a projection system configuration.

L'invention concerne un système d'imagerie optique comprenant un diviseur optique de faisceau de polarisation cartésien à grand angle, un dispositif d'optique d'éclairage à modulateur de lumière ayant un f/# <= 2.5, et au moins un modulateur de lumière réflecteur. Le diviseur optique de faisceau de polarisation cartésien (PBS) a une orientation structurelle définissant des axes de polarisation fixes. L'utilisation d'un PBS cartésien permet le développement de systèmes utilisant un PBS courbé qui produisent une sortie de lumière plus importante et/ou remplacent ou augmentent d'autres composants optiques. En reconnaissant et en appliquant de manière avantageuse les propriétés de polariseurs cartésiens à grand angle, cette invention a trait à un système d'imagerie optique à haute efficacité, qui peut fonctionner à f/#'s égal ou inférieur à f/2.5, tandis qu'un taux de contraste d'au moins 100 sur 1, ou, de préférence, 150 sur 1 est maintenu dans une configuration de système de contraste.

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