Screen and projector

A screen on which light beams are incident comprising:

• a first layer having viewing angle control means for enlarging viewing angle;
• and
• a second layer having angular conversion means for converting angles of incidence of incident light beams into a substantially same direction, 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,
• both the first and second layers diffuses the incident light beams, and
• the Fresnel lens moves at a linear velocity V, expressed by 0<V≦P×50 (mm/sec), where P is the lens pitch of the Fresnel lens and V is the linear velocity.

A screen on which light beams are incident comprising:

• a first layer having viewing angle control means for enlarging viewing angle;
• and
• a second layer having angular conversion means for converting angles of incidence of incident light beams into a substantially same direction, 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,
• at least one of the first and second layers diffuses the incident light beams, and
• in a case that an optical image formed by a light modulation device including a plurality of pixels is projected on the screen on a pixel basis, the Fresnel lens moves in such a way that a first pixel projected on the screen moves in association with the motion of the Fresnel lens within the extent formed by second pixels located adjacent to and surrounding the first pixel.