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US 8,801,205 B2Granted
LED illumination device with color converting surfaces
AssigneeXicato, Inc.
InventorsGerard Harbers, Serge J. A. Bierhuizen, Hong Luo
Life of this patent
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Abstract
An illumination module includes a color conversion cavity with a first interior surface having a first wavelength converting material and a second interior surface having a second wavelength converting material. A first LED is configured to receive a first current and to emit light that preferentially illuminates the first interior surface. A second LED is configured to receive a second current and emit light that preferentially illuminates the second interior surface. The first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device.
Claims14
An LED based illumination device, comprising:
- a color conversion cavity comprising a first surface area including a first wavelength converting material and a second surface area including a second wavelength converting material;
- a first LED configured to receive a first current, wherein light emitted from the first LED enters the color conversion cavity and preferentially primarily illuminates the first wavelength converting material, the first wavelength converting material is physically separated from a light emitting surface of the first LED, wherein a light emitted from the LED based illumination device based on the light emitted from the first LED has a first color temperature;
- a second LED configured to receive a second current, wherein light emitted from the second LED enters the color conversion cavity and preferentially primarily illuminates the second wavelength converting material, the second wavelength converting material is physically separated from a light emitting surface of the second LED, wherein a light emitted from the LED based illumination device based on light emission from the second LED has a second color temperature that is different than the first color temperature;
- wherein the second LED is mounted to a mounting board at an oblique angle with respect to the first LED;
- and
- wherein the first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device.
3 more elements
An LED based illumination device, comprising:
- a color conversion cavity comprising a first surface area including a first wavelength converting material and a second surface area including a second wavelength converting material;
- a first LED configured to receive a first current, wherein light emitted from the first LED enters the color conversion cavity and primarily illuminates the first wavelength converting material, the first wavelength converting material is physically separated from a light emitting surface of the first LED, wherein a light emitted from the LED based illumination device based on the light emitted from the first LED has a first color temperature;
- a second LED configured to receive a second current, wherein light emitted from the second LED enters the color conversion cavity and primarily illuminates the second wavelength converting material, the second wavelength converting material is physically separated from a light emitting surface of the second LED, wherein a light emitted from the LED based illumination device based on light emission from the second LED has a second color temperature that is different than the first color temperature;
- wherein the first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device;
- and
- an output window over an output port of the color conversion cavity, the output window comprising at least one of the first wavelength converting material and the second wavelength converting material, wherein the color conversion cavity is configured to mix a first light emitted from the first LED and converted by the first wavelength converting material with a second light emitted from the second LED and converted by the second wavelength converting material to produce a combined light that is emitted through the output window.
3 more elements
An LED based illumination device, comprising:
- a color conversion cavity comprising a first surface area including a first wavelength converting material and a second surface area including a second wavelength converting material, the color conversion cavity comprising a first transmissive element having a first surface area including the first wavelength converting material and a second surface area including the second wavelength converting material, and a second transmissive element disposed above and separated from the first transmissive element, the second transmissive element includes a third wavelength converting material;
- a first LED configured to receive a first current, wherein light emitted from the first LED enters the color conversion cavity and preferentially primarily illuminates the first wavelength converting material, the first wavelength converting material is physically separated from a light emitting surface of the first LED, wherein a light emitted from the LED based illumination device based on the light emitted from the first LED has a first color temperature;
- a second LED configured to receive a second current, wherein light emitted from the second LED enters the color conversion cavity and preferentially primarily illuminates the second wavelength converting material, the second wavelength converting material is physically separated from a light emitting surface of the second LED, wherein a light emitted from the LED based illumination device based on light emission from the second LED has a second color temperature that is different than the first color temperature;
- a third LED configured to receive a third current, wherein light emitted from the third LED enters the color conversion cavity and primarily illuminates the third wavelength converting material;
- wherein the first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device.
2 more elements
Dependencies are inferred from the claim text.