Flat-panel projection display
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United States of America Patent
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-
Sep 5, 2006
Grant Date -
Dec 9, 2004
app pub date -
Sep 25, 2001
filing date -
Sep 25, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A flat-panel projection display comprises a slab waveguide having a preferably embossed diffraction grating on one face, a lens for directing light into an edge of the waveguide, and in the focal plane of the lens a liquid-crystal modulator for modulating the intensity of the light as a function of lateral position and elevational direction of travel. The light is ejected from the slab waveguide by the grating at angles corresponding to the input angles, giving a virtual display. The light from the modulator can be expanded in one dimension by passing through a magnifying waveguide, followed by scattering in the plane by a screen and projection by a lens at the other end of the waveguide. Head-up and 3-D displays can be constructed using this principle.
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