Projection System and Method Including Spatial Light Modulator and Compact Diffractive Optics
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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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Citations
32 Claims
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1-21. -21. (canceled)
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22. A method of using an image projection system, comprising the steps of:
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producing a plurality of collimated, colored, light beams; illuminating an illumination hologram with the collimated colored light beams; illuminating a spatial light modulator with a beam of light from the illumination hologram to form an image beam; and focusing the image beam for viewing. - View Dependent Claims (23, 24, 25, 26)
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27. A method of operating an image projection system, comprising the steps of:
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producing a plurality of collimated, colored, light beams with a light source; directing the collimated, colored, light beams onto an illumination hologram to form light beams deflected at an angle; illuminating a spatial light modulator with the light beams deflected at an angle from the illumination hologram to form an image beam; receiving the image beam from the spatial light modulator in a projection focusing element; and focusing the image beam with the projection focusing element for viewing.
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28. A method of constructing an image projection system, comprising the steps of:
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installing a light source that can produce a plurality of collimated, colored, light beams for illuminating an illumination hologram; mounting a spatial light modulator so that it can be illuminated by light beams emanating from the illumination hologram to form an image beam; and providing a projection focusing element to focus the image beam for viewing. - View Dependent Claims (29, 30, 31, 32)
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Specification