A DMD illumination coupler, and a method of improving the wavefront quality of a transmitted illumination beam over the prior art using the invented DMD illumination coupler are disclosed. The invented DMD illumination coupler comprises an angularly selective reflective thin film. The invented DMD illumination...http://www.google.com.tw/patents/US6023365?utm_source=gb-gplus-share專利 US6023365 - DMD illumination coupler
