The present invention relates to a light valve image projector with a disposition for improving the contrast of an optical image projected on a screen by that projector. The projector comprises at least one illumination system, at least one field lens, at least one set consisting of a polarizer, an LCD...http://www.google.es/patents/US6224215?utm_source=gb-gplus-sharePatente US6224215 - Contrast improvement in liquid crystal light valve projectors
Contrast improvement in liquid crystal light valve projectors
