Screen, fresnel lens sheet used for the same, and image display apparatus using the same
First Claim
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
a transmissive screen for displaying the image projected from said optics;
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.
2 Assignments
0 Petitions
Accused Products
Abstract
An image display apparatus includes an image generation source, optics for projecting in an enlarged form the image generated by the image generation source, and a transmissive screen for displaying the image projected from said optics. The transmissive screen includes a Fresnel lens sheet disposed at an image generation source side, and a diffusing sheet disposed at an image-watching side in order to diffuse image light at least in a horizontal direction of the screen. The Fresnel lens sheet has a plurality of entrance-side prisms formed at the image generation source side, and a plurality of exit-side prisms formed at the image-watching side, and the Fresnel lens sheet emits lights in a first direction and a second direction. The first direction is almost parallel to a central axis of the Fresnel lens sheet, and the second direction extends toward the central axis.
9 Citations
4 Claims
-
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 a transmissive screen for displaying the image projected from said optics; 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. - View Dependent Claims (2, 3, 4)
-
Specification