Light (22) is projected from an image projector (20), in response to an image information signal (18) and is controllably refracted in response to a first control signal (26), for projecting refracted light (27) onto a screen (28). The screened light is for providing viewable images of varying size occupying...http://www.google.com/patents/US7108378?utm_source=gb-gplus-sharePatent US7108378 - Method and devices for displaying images for viewing with varying accommodation
