Patent ID: 7403335

Claim:
A screen onto which light is projected from an image generation source, said screen comprising: a Fresnel lens sheet including a plurality of entrance-side prisms each formed at the image generation source side, and a plurality of exit-side prisms each formed at the image-watching side; and a diffusing sheet disposed at the image-watching side of said Fresnel lens sheet, said diffusing sheet diffusing image light at least in a horizontal direction of said screen; wherein: said plurality of entrance-side prisms are each formed in the region where the light enters at an angle equal to or greater than a desired incident angle, at the image generation source side of said Fresnel lens sheet, and include an incident face at which the light enters, and a reflective face that reflects the light entering from the incident face and makes the light exit toward the image-watching side; said plurality of exit-side prisms are each formed in the range including a region of an opposite face with respect to a region in which said plurality of entrance-side prisms are not formed, at the image-watching side of said Fresnel lens sheet; and at least one of said plurality of exit-side prisms includes a first face inclining toward a central side of said Fresnel lens sheet with respect to a line orthogonal to a principal plane thereof, refracting the light and making it exit toward the image-watching side, a second face approximately parallel to the principal plane of said Fresnel lens sheet, and a third face approximately vertical to the principal plane of said Fresnel lens sheet, said second face being formed at an end of the image-watching side of said at least one of said plural exit-side prisms.