ACTIVE BLUE LIGHT LEAKAGE PREVENTING LED STRUCTURES
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United States of America Patent
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May 27, 2016
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Mar 8, 2016
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Abstract
The present invention discloses active blue light leakage preventing LED structures. Each of the structure includes a circuit board, at least one blue light LED die, a photo detector and a wavelength transformation layer, wherein the electric circuit on the circuit board receives detection signal from the photo detector and turns off the said blue light LED die accordingly. With the implementation of the present invention, the active blue light leakage preventing LED structure turns off the blue light LED die when it reaches its usage life span limit thus avoiding damage to human from the massive release of blue light.
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