Back Light Unit for Backlit Displays

Abstract: a back light unit includes a plurality of light emitting diodes positioned on a substrate and a plurality of flat lenses. a respective one of the plurality of flat lens are positioned a distance above a respective one of the plurality of light emitting diodes. each of the plurality of flat lenses includes a plurality of annular segments having a common center. each of the plurality of annular segments includes a prism shape microstructure having a first facet configured to refract the light in a desired direction and a second facet oriented in a plane that is parallel to a plane of an emitting surface of respective ones of the plurality of light emitting diode.

Inventor(s): Kenneth Lee Walker, Juhyun John Lee

CPC Classification: G02F1/133607 ({Illuminating devices})

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