TUNABLE WHITE POINT LIGHT SOURCE USING A WAVELENGTH CONVERTING ELEMENT
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United States of America Patent
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app pub date -
Jan 28, 2011
filing date -
Dec 15, 2006
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Abandoned
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Abstract
A uniform high brightness light source is provided using a plurality of light emitting diode (LED) chips with slightly different pump wavelengths with a wavelength converting element that includes at least two different wavelength converting materials that convert the light to different colors of light. The intensity of the light produced by the LED chips may be varied to provide a tunable CCT white point. The wavelength converting element may be, e.g., a stack or mixture of phosphor or luminescent ceramics. Moreover, the manufacturing process of the light source is simplified because the LED chips are all manufactured using the same technology eliminating the need to manufacture different types of chips.
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