The present invention discloses a projection display device, including a light source supplying light having a s-wave light and a p-wave light; a first polarizing beam splitter including a reflecting surface, transmitting the p-wave light and reflecting the s-wave light; a retardation film arranged between...http://www.google.ca/patents/US6582081?utm_source=gb-gplus-sharePatent US6582081 - Projection display device
