Patent ID: 7362503

Claim:
A screen onto which light is projected from an image generation source, said screen comprising: a Fresnel lens sheet including both a totally reflective prism formed at the image generation source side, and a refractive prism 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 in at least a horizontal direction of said screen: wherein said totally reflective prism is 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, said totally reflective prism including both an entrance face from which the light enters, and a totally reflective face that reflects the incident light entering from the entrance face and makes the light exit toward the image-watching side; said refractive prism is formed in the range including a region facing in an opposite direction to a region in which said totally reflective prism is not formed, at the image-watching side of said Fresnel lens sheet, said refractive prism including a refractive face that refracts the light and makes it exit toward the image-watching side; the refractive face of said refractive prism is rougher than the totally reflective face of said totally reflective prism; wherein a reflectivity of light at the totally reflective face of said totally reflective prism is higher than a reflectivity of light at the refractive face of said refractive prism.