Method and apparatus for producing untainted white light using off-white light emitting diodes
First Claim
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1. A light generating apparatus comprising:
- a first light emitting diode which emits light in a first frequency band;
a second light emitting diode which emits light in a second frequency band, wherein a combination of light emanating from said first light emitting diode and said second light emitting appears substantially white to a human eye.
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Abstract
A white light emitting device by using off-white light emitting diodes (LED'"'"'s). Rather than using just pure white LEDs, the white light emitting device arranges those LEDs which exhibit off-white colors in a manner such that the combination of light emanating from these off-white LEDs produces a radiation which appears substantially pure white to the human eye.
53 Citations
27 Claims
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1. A light generating apparatus comprising:
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a first light emitting diode which emits light in a first frequency band;
a second light emitting diode which emits light in a second frequency band, wherein a combination of light emanating from said first light emitting diode and said second light emitting appears substantially white to a human eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting device, comprising:
an array of light emitting diodes arranged wherein a light emitting diode having color coordinates that lie on one side of a black body curve is placed near a light emitting diode having color coordinates that lie on the other side of the black body curve and wherein a resultant color lies along a locus of a straight line joining the color coordinates. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A light emitting device comprising an array of white light emitting diodes with color coordinates distal from a black body curve, wherein a composite light has a color coordinate less distal from the black body curve.
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23. A white light emitting device comprising:
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a substrate with electrically conductive traces;
an array comprising at least one green-blue LED and one purple-blue LED for each green-blue LED, wherein said green-blue LED and said purple-blue LED are attached to said substrate;
encapsulant containing yellow phosphor wavelength converting material, covering each LED;
a circuit for providing electric current to each LED. - View Dependent Claims (24, 25, 26, 27)
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Specification