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 purplish-white light emitting diode comprising;
a first blue light emitting diode, wherein said first blue light has a wavelength between 460 and 465 nm; and
a first layer comprising a wavelength converting material for converting said first blue light to white light;
a greenish-white light emitting diode comprising;
a second blue light emitting diode, wherein said second blue light has a wavelength between 470 and 480 nm; and
a second layer comprising said wavelength converting material,wherein a combination of light emanating from said purplish-white light emitting diode and said greenish-white light emitting diode is white to the 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.
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Citations
9 Claims
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1. A light generating apparatus comprising:
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a purplish-white light emitting diode comprising; a first blue light emitting diode, wherein said first blue light has a wavelength between 460 and 465 nm; and a first layer comprising a wavelength converting material for converting said first blue light to white light; a greenish-white light emitting diode comprising; a second blue light emitting diode, wherein said second blue light has a wavelength between 470 and 480 nm; and a second layer comprising said wavelength converting material, wherein a combination of light emanating from said purplish-white light emitting diode and said greenish-white light emitting diode is white to the human eye. - View Dependent Claims (2, 3, 4)
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5. A white light emitting device comprising:
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a substrate with electrically conductive traces; an array comprising a first blue LED having a wavelength emission range of 470–
480 nm and a second blue LED having a wavelength emission range of 460–
465 nm, wherein said first blue LED and said second blue LED are attached to said substrate;encapsulant comprising yellow phosphor wavelength converting material, covering each LED, wherein a combination of converted light from said first blue LED and said second blue LED produces pure white light; a circuit for providing electric current to each LED. - View Dependent Claims (6, 7, 8, 9)
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Specification