Projection type display apparatus having an aperture stop means

Details Projection type display apparatus having an aperture stop means Projection type display apparatus having an aperture stop means

1991-11-27

1993-12-28

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 48, 359 51, 359 67, 353 34, 353 75, G02F 1133

Patent

active

052744809

ABSTRACT:
A projection type display apparatus comprises a light source optical system having an anisotropic luminance distribution, a transparent-scattering type display element for controlling light emitted from the light source optical system and a projection optical system having an aperture which projects the transmitted light, wherein the aperture of the projection optical system is an aperture having a non-circular opening which is disposed in the vicinity of the focal point of the transmitted light of the transparent-scattering type display element.

REFERENCES:
patent: 3909114 (1975-09-01), Haas et al.
patent: 4386826 (1983-06-01), Stolov
patent: 4435047 (1984-03-01), Fergason
patent: 4613207 (1986-09-01), Fergason
patent: 4693557 (1987-09-01), Fergason
patent: 4913529 (1990-04-01), Goldenberg et al.
The Mead Corporation Research Disclosure, May 1987, pp. 310-311, 27734, "Rectangular Aperture for use in Exposing A Photosensitive Media with A Liquid Crystal Cell".
Patent Abstracts of Japan, vol. 9, No. 148(P-366) [1871], Jun. 22, 1985 & JP-A-60-26317, Feb. 22, 1983.
T. Miura, et al., "Imaging Device".
The Mead Corporation Research Disclosure, Feb. 1988, pp. 62-63, 28608, "Methods for Lalc Contrast Ration Control".

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