Patent ID: 7764425
Filing Date: 2010-07-27
Classification: G03B

Abstract:
1. A screen on which light beams are incident comprising: a first layer having viewing angle control means for enlarging viewing angle, a second layer having angular conversion means for converting angles of incidence of incident light beams into a substantially same direction, and a light diffusing material disposed in at least one of the first and second layers that diffuses the incident light beams, wherein the first layer is fixed, the second layer has a moving section for moving the second layer relative to the first layer, the first layer is a lenticular lens and the second layer is a Fresnel lens, and when one of the Fresnel lens and the lenticular lens has the diffusion capability, the Fresnel lens moves at a linear velocity V, expressed by V≧P×50 (mm/sec), where P is the lens pitch of the Fresnel lens and V is the linear velocity.