Projection system improvement

Details Projection system improvement Projection system improvement

1996-11-25

1998-11-10

Dowling, William C.

Optics: image projectors

Polarizer or interference filter

353 78, G03B 2114

Patent

active

058333398

ABSTRACT:
A back-projector projection system, which includes a projector which emits a light beam, a screen and means for directing the light beam onto the screen. The means for directing the light beam onto the screen includes a first means which circularly polarizes, in a first sense, the light beam output by the projector, at least one polarization filter which reflects light circularly polarized in a second sense opposite to the first sense, and a plane mirror. The polarization filter and the plane mirror are positioned substantially parallel to each other to make the light beam output by the first means undergo three reflections, between the polarization filter and the plane mirror, before directing the beam onto the screen.

REFERENCES:
patent: 5573324 (1996-11-01), DeVaan
SID International Symposium--Digest of Technical Papers, vol. 25, No. 26., 14-16 Jun. 1994, San Jose US, pp. 399-402, R. Maurer et al. Cholestric Reflectors With a Color Pattern.

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