Large-screen projection-type display
First Claim
1. A large-screen projection-type display using a transmission-type screen, wherein s id transmission-type screen is formed of, at least, two sheets, or a first sheet provided on the viewer'"'"'s side, and a second sheet provided on the projection source side far from said first sheet, both of said sheets are tilted toward the viewers by about 0.04 radian or above relative to the vertical direction, said first sheet is tensioned at least in the vertical direction, said second sheet has a warp of more than about 2.4 times as large as its thickness, and said first sheet and said second sheet are kept spaced about 7 mm or below.
1 Assignment
0 Petitions
Accused Products
Abstract
The object of the invention is to provide a large-screen projection-type display using a transmission-type screen, wherein the transmission-type screen is formed of two or more sheets 4, 7, is tilted toward the viewer'"'"'s side with a small gap kept between the sheets, and is stable relative to the temperature and moisture change of the environment. The front sheet 4 provided on the viewer'"'"'s side and the Fresnel sheet 7 provided on the projection source side are tilted forward by about 7° toward the viewers. The springs 10 are extended through wires 9 to exert the tension on the front sheet 4 in the vertical direction. At the same time, the springs exert a pressure on the Fresnel sheet 7 in the vertical direction.
22 Citations
10 Claims
- 1. A large-screen projection-type display using a transmission-type screen, wherein s id transmission-type screen is formed of, at least, two sheets, or a first sheet provided on the viewer'"'"'s side, and a second sheet provided on the projection source side far from said first sheet, both of said sheets are tilted toward the viewers by about 0.04 radian or above relative to the vertical direction, said first sheet is tensioned at least in the vertical direction, said second sheet has a warp of more than about 2.4 times as large as its thickness, and said first sheet and said second sheet are kept spaced about 7 mm or below.
- 6. A large-screen projection-type display using a transmission-type screen, wherein said transmission-type screen is formed of, at least, two sheets, or a front sheet provided on the viewer'"'"'s side and a Fresnel sheet provided on the projection source side far from said front sheet, both said sheets are tilted toward the viewers by about 0.04 radian or above relative to the vertical direction, said front sheet is tensioned at least in the vertical direction, said Fresnel sheet has a warp of more than about 2.4 times as large as its thickness, and said front sheet and said Fresnel sheet are kept spaced about 7 mm or below.
Specification