Liquid crystal projector having improved color uniformity

Details Liquid crystal projector having improved color uniformity Liquid crystal projector having improved color uniformity

1996-09-03

1998-11-03

Dowling, William

Optics: image projectors

Polarizer or interference filter

353 31, 353 34, G03B 2114

Patent

active

058298525

ABSTRACT:
The color uniformity of a liquid crystal projector is improved by introducing phase lag plates. The light beam from a light source is first passed through a phase lag plate and only then through the liquid crystal element. In this manner, the phase lag plate introduces rotational polarization so that the S-polarized light is aligned throughout the entire beam front. Optionally, the image can be further improved by introducing a cold mirror to intercept the ultraviolet rays and a hot mirror to intercept the infrared rays.

REFERENCES:
patent: 5374968 (1994-12-01), Haven et al.
patent: 5486884 (1996-01-01), De Vaan
patent: 5541673 (1996-07-01), Shioya et al.
patent: 5575548 (1996-11-01), Lee

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