An illumination device and method is provided herein for calibrating individual LEDs and photodetector(s) included within the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over time as the LEDs age. Specifically, a calibration method is provided herein for characterizing each emission LED and each photodetector separately. The wavelength and intensity of the illumination produced by each emission LED is accurately characterized over a plurality of different drive currents and ambient temperatures, and at least a subset of the wavelength and intensity measurement values are stored with a storage medium of the illumination device for each emission LED. The responsivity of the photodetector is accurately characterized over emitter wavelength and photodetector junction temperature, and results of said characterization are stored with the storage medium.

Claims

25 · 3 independent · depth 7

25 granted claims

›1.independentA method for calibrating an illumination device comprising at least a first emission light emitting diode (LED) and a photodetector, the method compri…+10

›2.↳ 1The method as recited in claim 1 , wherein the intensity measurements comprise radiance measurements.d2

›3.↳ 1The method as recited in claim 1 , wherein the intensity measurements comprise luminance measurements.d2

›4.↳ 1The method as recited in claim 1 , further comprising subjecting the illumination device to a second ambient temperature, which is different from the …d2+2

›7.↳ 1The method as recited in claim 1 , further comprising: measuring a photocurrent induced on the photodetector by the illumination produced by the first…d2+4

›8.↳ 7The method as recited in claim 7 , further comprising: calculating a photodetector responsivity value for each of the different drive currents, wherei…d3+3

›12.independentAn illumination device, comprising: a plurality of emission light emitting diodes (LEDs) configured to produce illumination for the illumination devic…+11

›13.↳ 12The illumination device as recited in claim 12 , wherein for each emission LED, the table of calibration values comprises: a first plurality of wavele…d2

›14.↳ 12The illumination device as recited in claim 12 , wherein the interface is a wired interface, which is configured to communicate over an AC mains, a de…d2

›15.↳ 12The illumination device as recited in claim 12 , wherein for each emission LED, the LED driver and receiver circuit is further configured for: applyin…d2+5

›16.↳ 15The illumination device as recited in claim 15 , wherein for each emission LED, the table of calibration values comprises: a first plurality of forwar…d3+4

›20.↳ 16The illumination device as recited in claim 16 , wherein the LED driver and receiver circuit is coupled to the a photodetector and further configured …d4+3

›21.↳ 20The illumination device as recited in claim 20 , further comprising control circuitry coupled to the LED driver and receiver circuitry, wherein for ea…d5+2

›17.↳ 12The illumination device as recited in claim 12 , wherein the interface is a wireless interface configured to communicate using radio frequency (RF), i…d2+1

›19.↳ 12The illumination device as recited in claim 12 , further comprising a photodetector configured for detecting the illumination produced by each of the …d2

›24.independentA method for calibrating an illumination device comprising at least a first emission light emitting diode (LED) and a photodetector, the method compri…+1

Classifications

7 codes

IPC · International Patent Classification

Section H — Electricity

H05B45/10
H05B45/22
H05B45/14
H05B37/02
H05B33/08
H05B47/19
H05B45/20

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2.6 y

957 days filing → grant

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non-final + final

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2 RCE

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Angela M Lie

art unit 3992 · TC 3900

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