LED light source with field-of-view-controlling optics
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United States of America Patent
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Aug 5, 2003
Grant Date -
Feb 14, 2002
app pub date -
Mar 6, 2001
filing date -
Mar 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Pixels for a large video display which employs solid-state emitters, such as colored light emitting diodes, as light source are formed by outfitting each colored solid state emitter within the pixel with an individually tailored miniature intensity-enhancing optical system. Each of these miniature optical systems comprises a set of four wide field-of-view Lambertian reflectors 34, a pair of narrow field-of-view Lambertian reflectors 36, and a beam-shaping lens 38. The miniature intensity-enhancing optical system can be specifically designed to restrict emission in the vertical field-of-view, while providing a Lambertian intensity dependence throughout an unrestricted horizontal view. For example, the field-of-view in the vertical direction may be limited to about .+-.30.degree. while the field-of-view is about .+-.90.degree. in the horizontal direction.
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