Kernels are designed in different configurations based on design properties of an enclosure or other requirements. A prism assembly having various types of filters, waveplates, beam splitters (e.g., path length matched beam splitters) and/or other optical components are provided to selectively direct...http://www.google.com.au/patents/US7352513?utm_source=gb-gplus-sharePatent US7352513 - Prism assemblies and kernel configurations for use in projection systems
