Provided are an illumination optical system having superior color rendering properties while ensuring sufficient illuminance, an image display apparatus comprising the illumination optical system and a spatial modulation device illuminated by the illumination optical system, and a method of illuminating...http://www.google.es/patents/US6921176?utm_source=gb-gplus-sharePatente US6921176 - Illuminating optical system, image display unit and method of illuminating space modulation element
Illuminating optical system, image display unit and method of illuminating ...
