Broad spectrum light source calibration systems and related methods
First Claim
1. A light source having an adjustable color point, comprising:
- a broad spectrum light emitter;
an LED with a peak emission wavelength within a spectrum of the broad spectrum light emitter; and
a controller configured to use the LED as a wavelength selective light sensor to measure a portion of the spectrum of the broad spectrum light emitter and to use the LED as a light emitter to produce illumination to adjust a color point of the light source.
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Accused Products
Abstract
Systems and methods are disclosed for light sources that use the photo-sensitivity of one or more colored LEDs to determine at least a portion of the emission spectrum of a white light source or other broad spectrum light emitter. As described herein, a white LED or other broad spectrum light emitter can be used as the light source, if desired, along with one or more additional colored LEDs, and the same colored LEDs can be used to emit light and to adjust a color point produced by the light source. Applications for the disclosed embodiments include but are not limited to general lighting, LCD backlighting, projectors, and direct emission displays such as OLEDs and digital billboards.
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Citations
32 Claims
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1. A light source having an adjustable color point, comprising:
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a broad spectrum light emitter; an LED with a peak emission wavelength within a spectrum of the broad spectrum light emitter; and a controller configured to use the LED as a wavelength selective light sensor to measure a portion of the spectrum of the broad spectrum light emitter and to use the LED as a light emitter to produce illumination to adjust a color point of the light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for adjusting a color point for a light source, comprising emitting a spectrum of light with a broad spectrum light emitter;
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using an LED, having a peak emission wavelength within the spectrum of the broad spectrum light emitter, as a wavelength selective light sensor to measure a portion of the spectrum of the broad spectrum light emitter; and using the LED as a light emitter to produce illumination to adjust a color point of the light source. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A controller for a light source having an adjustable color point, comprising:
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control circuitry configured to be coupled to a broad spectrum light emitter and an LED with a peak emission wavelength within a spectrum of the broad spectrum light emitter, the control circuitry being configured to use the LED as a wavelength selective light sensor to measure a portion of the spectrum of the broad spectrum light emitter; and output driver circuitry configured to be coupled to the broad spectrum light emitter and the LED and to use the LED as a light emitter to adjust a color point for light emitted from the broad spectrum light emitter and the LED. - View Dependent Claims (30, 31, 32)
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Specification