A lens is arranged to form a spatially varying intensity distribution at a photoreceptor within a pixel region so as to form a charge pattern thereon. The photoreceptor is associated with a liquid crystal device such that the presence of a suitable recording voltage across the photoreceptor and...http://www.google.com.au/patents/US5729305?utm_source=gb-gplus-sharePatent US5729305 - Optical device including a spatial optical modulator and an optical element 
