The laser illuminated image projection system includes a microlaser array coupled with a beam shaper to produce an exceptionally bright projection light beam. In one embodiment, the beam shaper includes a binary phase plate to modify the shape and intensity profile of the projection light beam....http://www.google.com.tw/patents/US5704700?utm_source=gb-gplus-share專利 US5704700 - Laser illuminated image projection system and method of using same
