LED LIGHT EXTRACTION BAR AND INJECTION OPTIC FOR THIN LIGHTGUIDE
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United States of America Patent
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Issued Date -
Oct 23, 2008
app pub date -
Apr 20, 2007
filing date -
Apr 20, 2007
priority date (Note) -
Abandoned
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Abstract
An optical system for back-illuminating a display has a lightguide having a confinement direction and a first plurality of light sources disposed proximate a first edge of the lightguide. Light from at least one of the light sources defines an emission axis which is approximately parallel to the confinement direction. A solid light injector is disposed to couple light from the light sources into the lightguide. A surface of the light injector may be shaped as a confinement curve for confining light from the first plurality of light sources in the confinement direction by total internal reflection. In some embodiments a portion of the illumination light from the one or more light sources enters the first light injector along a direction having a component directed away from the lightguide and is totally internally reflected within the injector.
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