Planar front illumination system having a light guide with micro lenses formed thereon and method of manufacturing the same
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United States of America Patent
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Mar 15, 2016
Grant Date -
Mar 14, 2013
app pub date -
Aug 17, 2012
filing date -
Aug 19, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A system for illuminating a reflective display or other material from a planar front device and a method of manufacture thereof. The system includes a light guide plate that conducts light from an edge light source across the face of a reflective display. Micro lenses are formed on the inner or outer surface of the light guide and direct the light conducted in the light guide toward the display. A stepped index layer is formed on the surface of light guide plate containing the micro lenses. The stepped index layer has an index of refraction lower than an index of refraction of the light guide plate to assist in the total internal reflection of light injected into the light guide plate. A top layer protective coat or touch screen can be laminated to the outside of the light guide plate.
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