A high efficiency prism is provided that directs one or more color components (e.g., red, green and blue) of light through one or more different light paths to generate a color image. One or more different embodiments of the prism are shown including several in-line embodiments, several right-angle embodiments,...http://www.google.com.au/patents/US20020001135?utm_source=gb-gplus-sharePatent US20020001135 - High efficiency prism assembly for image projection
