An image display system includes a light valve 14 for providing image information to light converged by a converging lens 13 and for emitting the light, a projective optical system 20 including a refractive optical lens 21 for projecting the light from the light valve 14 and a convex mirror 22 for reflecting...http://www.google.es/patents/US7237908?utm_source=gb-gplus-sharePatente US7237908 - Image display system
