Projection system and method including spatial light...

Optics: image projectors – Particular condenser

Reexamination Certificate

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C353S020000, C353S084000, C348S771000, C348S345000, C348S745000, C359S015000, C359S020000, C349S030000

Reexamination Certificate

active

08047660

ABSTRACT:
A method and apparatus for a projection display system includes a spatial light modulator and a volume illumination hologram. The spatial light modulator comprises a digital micromirror device, and the projection system includes a laser light source to produce a sequence of collimated, colored, light beams for the illumination hologram. Waste light produced by the spatial light modulator is transmitted to the illumination hologram, and the illumination hologram emits waste light from at least one of its edges. Waste light emitted from an edge of the illumination hologram is absorbed by a light sensor to control the intensity of the light beams. A projection focusing element is mounted proximate a side of the illumination hologram to focus the image beam from the spatial light modulator for viewing. A projection hologram is interposed between the side of the illumination hologram and the projection focusing element to manage waste light.

REFERENCES:
patent: 5256869 (1993-10-01), Lin et al.
patent: 6407724 (2002-06-01), Waldern et al.
patent: 2003/0147112 (2003-08-01), Mukawa
patent: 2004/0130762 (2004-07-01), Thomas et al.
patent: WO 2004066037 (2004-08-01), None
Nesbitt, R.S., “Edgelit Holography: Extending Size and Color,” M.S. Thesis, Massachusetts Institute of Technology, Sep. 1999.
Sinha, A. et al., “Imaging Using Volume Holograms,” Optical Engineering, vol. 43, No. 9, Sep. 2004, pp. 1959-1972.

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