PRINTED LED LIGHT SHEETS WITH REDUCED VISIBILITY OF PHOSPHOR LAYER IN OFF STATE
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United States of America Patent
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app pub date -
Jan 27, 2016
filing date -
Jan 28, 2015
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Abstract
Various applications and customizations of a thin flexible LED light sheet are described. Microscopic LED dice are printed on a thin substrate, and the LEDs are sandwiched between two conductor layers to connect the LEDs in parallel. The conductor layer on the light emitting side is transparent. In one embodiment, small dots of printed blue LED dies with overlapping dots of a YAG (yellow) phosphor are formed on a substrate, with the areas between the dots being a neutral color or an anti-color (blue for a yellow phosphor).
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