Color modulated LED-based illumination
AssigneeXicato, Inc.
InventorsGerard Harbers, Barry Mark Loveridge
Life of this patent
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Abstract
An LED based illumination device transmits information by receiving an amount of digital data and modulating a color of light emitted from the LED based illumination device based on the digital data. The luminous flux of the emitted light remains approximately constant while the color of light varies. A receiver may receive the emitted light and demodulate a signal indicative of the color of emitted light to determine the digital data. The color of the light may be modulated by varying current provided to different LEDs, where the different LEDs cause different color of light to be emitted from the LED based illumination device.
Claims22
A method of transmitting information from an LED based illumination device, comprising:
- receiving an amount of digital data;
- and
- modulating a color of light emitted from the LED based illumination device based on the digital data such that a luminous flux of the light emitted from the LED based illumination device remains approximately constant while the color of light varies, wherein the modulating the color of light emitted from the LED based illumination device involves,
- modulating a first current provided to a first LED, and
- modulating a second current provided to a second LED;
- and
- wherein the first LED preferentially illuminates a first wavelength converting material, and wherein the second LED preferentially illuminates a second wavelength converting material that is different from the first wavelength converting material.
A method of receiving information from an LED based illumination device, comprising:
- receiving an amount of light emitted from the LED based illumination device, wherein a luminous flux of the amount of light emitted from the LED based illumination device remains approximately constant while a color of light varies, wherein the color of light varies by modulating a first current provided to a first LED in the LED based illumination device, and modulating a second current provided to a second LED in the LED based illumination device;
- wherein the first LED preferentially illuminates a first wavelength converting material, and wherein the second LED preferentially illuminates a second wavelength converting material that is different from the first wavelength converting material;
- determining a signal indicative of the color of the received light;
- and
- demodulating the signal indicative of the color of the received light to determine the digital data received from the LED based illumination device.
An LED based illumination device comprising:
- a first LED configured to receive a first current, wherein light emitted from the first LED enters a color conversion cavity, and wherein a first light emitted from the LED based illumination device based on the light emitted from the first LED is a first colored light;
- a second LED configured to receive a second current, wherein light emitted from the second LED enters the color conversion cavity, and wherein a second light emitted from the LED based illumination device based on the light emitted from the second LED is a second colored light;
- and
- a modulator configured to receive an amount of digital data and modulate the first current and the second current such that a luminous flux of the light emitted from the LED based illumination device remains approximately constant and a combined color of light emitted from the LED based illumination device varies based on the digital data;
- wherein the light emitted from the first LED preferentially illuminates a first wavelength converting material that is physically separated from a light emitting surface of the first LED, and wherein the light emitted from the second LED preferentially illuminates a second wavelength converting material that is physically separated from a light emitting surface of the second LED.
Dependencies are inferred from the claim text.