Patent ID: 7697202
Filing Date: 2010-04-13
Classification: G03B

Abstract:
1. An image display apparatus comprising: an image generation source; optics for projecting in an enlarged form an image generated by said image generation source; and wherein said transmissive screen includes at least both a Fresnel lens sheet disposed at an image generation source side, and a diffusing sheet disposed at an image-watching side, the diffusing sheet diffusing image light in at least a horizontal direction of said screen; the Fresnel lens sheet includes both a totally reflective prism formed at the image generation source side, and a refractive prism formed at the image-watching side, the totally reflective prism not only being formed in a region where the light enters at an angle equal to or greater than a desired incident angle, at the image generation source side of the Fresnel lens sheet, but also 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; and the totally reflective face is constructed of more than at least two faces, or as a spherical face or a nonspherical face, for causing the incident light from the entrance face to go out as exit rays of exit angles with more than at least two directions.