Color display from a single light valve

Details Color display from a single light valve Color display from a single light valve

1984-06-29

1985-11-12

Haroian, Harry N.

Optics: image projectors

Composite projected image

Multicolor picture

353 99, 353 94, G03B 2128

Patent

active

045524416

ABSTRACT:
A color display is produced by overlaying two images from a single light valve. Filters are used to select the two primary colors used in the display. The two projection beams are folded and merged onto a dichroic mirror where they combine so that they follow an identical path to the screen. The dichroic mirror is positioned so that the two projection beams are equivalent when they strike the dichroic mirror. The dichroic mirror is an interference filter which reflects the spectral band passed by the first filter over a range of incident angles and transmits the spectral band passed by the second filter over the same range of angles.

REFERENCES:
patent: 3922080 (1975-11-01), Kodama et al.
patent: 4150396 (1979-04-01), Hareng et al.
patent: 4345258 (1982-08-01), Tsai et al.
IBM Technical Disclosure Bulletin, vol. 21, No. 3, Aug. 1978, A. G. Dewey, "Image Overlay with Single Projection Lens."

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