Optical system including a planar waveguide
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United States of America Patent
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Aug 19, 2003
Grant Date -
Jan 24, 2002
app pub date -
Mar 20, 2001
filing date -
Mar 20, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
An optical waveguide system includes a generally planar waveguide 1 arranged so that light can be injected by a projector 2 into one edge at a range of out-of-plane angles. The waveguide 1 is tapered so that different out-of-plane angles, after being totally internally reflected for a certain distance, leave the waveguide at different respective points along the waveguide. This expands the image in the direction of propagation along the waveguide. Meanwhile the image is expanded transversely by a parallel-sided input waveguide 3. A large-area flat-panel display is thus created, or the planar waveguide can be used as a planar collimating light source or, using layers of controllable optical index, an optical switch.
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