WHITE LIGHT EMITTING DIODE
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United States of America Patent
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Issued Date -
Apr 5, 2012
app pub date -
Oct 1, 2010
filing date -
Oct 1, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A white light emitting diode comprises a light emitting diode chip for emitting a blue light, a first wavelength conversion layer and a second wavelength conversion layer. The light emitting diode chip comprises a first lighting area and a second lighting area through which at least two currents flow, respectively. The first wavelength conversion layer is coated on the first lighting area and generates a first conversion light upon excitation by the blue light. A warm white light is generated by mixing the blue light and the first conversion light. The second wavelength conversion layer is coated on the second lighting area and generates a second conversion light upon excitation by the blue light. A cold white light is generated by mixing the blue light and the second conversion light. The amount of the currents can be controlled to modify the luminescence intensity of each light area, thus adjusting the color temperature of the white LED.
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