WHITE LED FOR LIQUID CRYSTAL DISPLAY BACKLIGHTS
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United States of America Patent
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Issued Date -
May 5, 2011
app pub date -
Apr 27, 2010
filing date -
Apr 27, 2009
priority date (Note) -
Abandoned
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Abstract
A light emitting diode (LED), method for optimizing an LED having characteristics which are tailored for a liquid crystal color filter set, and a liquid crystal display (LCD) using the LED are disclosed. The spectral response of the LED is optimized to provide the preferred optical properties when its light is transmitted through the color filter set and liquid crystal stack. Embodiments provide a diode chip which intrinsically emits light with wavelengths primarily within the blue visible spectrum (‘blue chip’). Surrounding the chip would be a first layer of phosphor that emits light with wavelengths primarily within the yellow-green region of the visible spectrum via phosphorescence with the blue light which is emitted from the diode chip (‘yellow-green phosphor’). There would also preferably be a second layer of phosphor that emits light with wavelengths primarily within the red region of the visible spectrum via phosphorescence with the blue light which is emitted from the diode chip (‘red phosphor’).
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