Directional front illuminating device comprising a film based lightguide with high optical clarity in the light emitting region
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United States of America Patent
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May 9, 2017
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app pub date -
Mar 9, 2012
filing date -
Mar 9, 2011
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Abstract
A directional front illumination device includes a film-based lightguide, a plurality of strips of the film extended from a lightguide region of the film along one side of the film with the strips folded and stacked such that they are parallel to each other with their ends forming a light input surface, and light extraction features defining a light emitting region of the film where the light emitting region has a high optical clarity and greater than 90% of the flux is emitted in a first direction toward an object. In one embodiment, the optical clarity of the light emitting region is greater than 70%. In another embodiment, the light extraction features have a fill-factor area percentage less than 20%.
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