Rear projection image display device
AssigneeKuraray Co., Ltd.
InventorsMasaki Ishii, Ichiro Matsuzaki, Toru Watanabe
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Abstract
A rear-projection image display device comprising a light source, a display element for visual images, a projection lens and a screen for viewing visual images projected on the screen from the rear, wherein the ratio d/a between the diameter d of the exit pupil of the projection lens and the projection distance a is 0.06 or less, said screen whereon visual images are displayed includes at least two diffusion elements, and light-diffusing fine particles are dispersed in one of the two diffusion elements which is closest to the viewer.
Claims6
A rear-projection image display device, comprising:
- a light source;
- a display element for visual images;
- a projection lens;
- and
- a screen for viewing visual images projected on the screen from a rear of the screen;
- wherein a ratio d/a between a diameter (d) of an exit pupil of the projection lens and a projection distance (a) is 0.06 or less, said screen whereon visual images are projected includes a first diffusion element arranged closer to the light source and a second diffusion element arranged closer to the viewer, and said second diffusion element containing light-diffusing particles.
A rear-projection image display device, comprising:
- a light source;
- a display element for visual images;
- a projection lens;
- and
- a screen for viewing visual images projected on the screen from the rear;
- wherein a ratio d/a between a diameter (d) of an exit pupil of the projection lens and a projection distance (a) is 0.06 or less, light-diffusing particles are dispersed in said screen for viewing visual images, and said light-diffusing particles are shaped non-spherical so that, when incident light rays are parallel, emergent light rays emitted from plural points on said light-diffusing particles can be directed in an equivalent direction.
Dependencies are inferred from the claim text.