Optics: image projectors – Particular condenser
Reexamination Certificate
2010-01-13
2011-11-01
Epps, Georgia Y (Department: 2878)
Optics: image projectors
Particular condenser
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.
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Sinha, A. et al., “Imaging Using Volume Holograms,” Optical Engineering, vol. 43, No. 9, Sep. 2004, pp. 1959-1972.
Barry Ronald Allen
Dewald Duane Scott
Penn Steven Monroe
Brady III Wade J.
Brill Charles A.
Cruz Magda
Epps Georgia Y
Telecky , Jr. Frederick J.
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