Projection display device

Details Projection display device Projection display device

1998-08-21

2000-12-05

Dowling, William

Optics: image projectors

Unitary plural refracting surfaces

353 31, G03B 2114

Patent

active

061556866

ABSTRACT:
To provide a projection display device which can easily produce a high contrast, bright projection image, without obliquely mounting the light source. In a projection display device, a condenser lens is disposed such that its optical axis is disposed at a location parallel to an optical axis of a light source by moving the optical axis of the condenser lens with respect to the optical axis L of the light source in substantially the same direction that an optical axis of a projection lens 60 is moved with respect to the optical axis of the light source. Therefore, light can obliquely illuminate a liquid crystal light valve, and can be efficiently guided to the projection lens. Consequently, a high contrast, bright projection image can be easily provided.

REFERENCES:
patent: 4436393 (1984-03-01), Vanderwerf
patent: 4936657 (1990-06-01), Tejima et al.
patent: 5098184 (1992-03-01), Van Den Brandt et al.
patent: 5283599 (1994-02-01), Tejima et al.
patent: 5355188 (1994-10-01), Biles et al.
patent: 5865521 (1999-02-01), Hashizume et al.

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