Projection system and method including spatial light modulator and compact diffractive optics
First Claim
1. A method of using an image projection system, comprising the steps of:
- 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;
illuminating a projection hologram with the image beam and waste light produced by the spatial light modulator such that the waste light is emitted from an edge of the projection hologram; and
focusing the image beam for viewing.
0 Assignments
0 Petitions
Accused Products
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.
88 Citations
10 Claims
-
1. A method of using an image projection system, comprising the steps of:
-
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; illuminating a projection hologram with the image beam and waste light produced by the spatial light modulator such that the waste light is emitted from an edge of the projection hologram; and focusing the image beam for viewing. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of constructing an image projection system, comprising the steps of:
-
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; providing a projection hologram that can receive the image beam and waste light produced by the spatial light modulator and that can emit waste light from an edge of the projection hologram; and providing a projection focusing element to focus the image beam for viewing. - View Dependent Claims (7, 8, 9, 10)
-
Specification