ILLUMINATION SYSTEM CALIBRATION AND OPERATION HAVING A CALIBRATION MATRIX CALCULATION BASED ON A SHIFT IN COLOR SPACE (AS AMENDED)

• US 20090127431A1
• Filed: 11/21/2007
• Published: 05/21/2009
• Est. Priority Date: 11/21/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Halvordsson, Erik, Helbing, Rene, Tan, Boon Keat
• Granted Patent: US 7,547,869 B2
• Time in Patent Office: Days
• US Class Current: 250/205
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G01J 2001/4247 for testing lamps or other light sources
• CPC Class Codes: G01J 3/50 using electric radiation detectors

Abstract

A method for calibrating an illumination system is disclosed herein. The illumination system comprises at least one light emitter and at least one color sensor. The method comprises emitting a first wavelength of light from the a light emitter and measuring the color of light emitted by the light emitter using the color sensors. A second wavelength of light is emitted from the a light emitter and the color of light emitted by the light emitter is measured using the color sensors. The shift in color space based on the measurements is calculated. At least one calibration matrix based on the shift in colors space is calculated.

Claims

1. A method for calibrating an illumination system, said illumination system comprising at least one light emitter and at least one color sensor, said method comprising:

emitting a first wavelength of light from said at least one light emitter;

measuring the color of light emitted by said at least one light emitter using said at least one color sensor;

emitting a second wavelength of light from said at least one light emitter;

measuring the color of light emitted by said at least one light emitter using said at least one color sensor;

calculating the shift in color space based on the measurements; and

calculating at least one calibration matrix based on said shift in colors space.

2. The method of claim 1, wherein said emitting a second wavelength of light comprises shifting the peak wavelength emitted by said at least one light emitter in a first direction.

3. The method of claim 2 and further comprising emitting a third wavelength of light using said at least one light emitter, wherein said emitting a third wavelength of light comprises shifting the peak wavelength emitted by said at least one light emitter in a second direction opposite said first direction, and wherein said calculating the shift includes calculating the shift in color space of said third wavelength.

4. The method of claim 1, wherein said second wavelength of light differs from said first wavelength of light by approximately one nanometer.

5. The method of claim 1, wherein said emitting a second wavelength of light comprises changing the temperature of said at least one light emitter from the temperature of said at least one light emitter during emission of said first wavelength of light.

6. The method of claim 1, wherein said emitting a second wavelength of light comprises changing the current flow through said at least one light emitter from the current flow of said at least one light emitter during emission of said first wavelength of light.

7. The method of claim 1, wherein said at least one emitter is a light emitting diode.

8. The method of claim 1, wherein said illumination comprises a plurality of light emitters, and wherein said method further comprises turning on a single light emitter.

9. A method for calibrating an illumination system, said illumination system comprising a plurality of light emitters and a plurality of color sensors, said method comprising:

emitting a first color of light having a first peak wavelength using a first of said plurality of light emitters;

measuring said first color of light using said plurality of color sensors;

emitting a second color of light having a second peak wavelength using said first light emitter;

measuring said second color of light using said color sensors;

calculating the shift in color space based on the measurements; and

calculating at least one first calibration matrix based on said shift in colors space.

10. The method of claim 9, and further comprising turning off all of said plurality of light emitters except said first light emitter.

11. The method of claim 9, and further comprising:

turning off said first light emitter;

emitting a third color of light having a first peak wavelength using a second of said plurality of light emitters;

measuring said third color of light using said plurality of color sensors;

emitting a fourth color of light having a second peak wavelength using said second light emitter;

measuring said fourth color of light using said color sensors;

calculating the shift in color space based on the measurements; and

calculating at least one second calibration matrix based on said shift in colors space.

12. The method of claim 9, wherein said emitting a second color of light comprises shifting the peak wavelength emitted by said first light emitter in a first direction.

13. The method of claim 12 and further comprising emitting a fifth color of light using said first light emitter, wherein said emitting a fifth color of light comprises shifting the peak wavelength emitted by said first light emitter in a second direction opposite said first direction, and wherein said calculating the shift includes calculating the shift in color space of said peak wavelength.

14. The method of claim 9, wherein said first color of light differs from said second color of light by approximately one nanometer.

15. The method of claim 9, wherein said emitting a second color of light comprises changing the temperature of said first light emitter from the temperature of said first light emitter during emission of said first color of light.

16. The method of claim 9, wherein said emitting a second color of light comprises changing the current flow through said first light emitter from the current flow of said first light emitter during emission of said first color of light.

17. The method of claim 9, wherein said first light emitter is a light emitting diode.

18. A method of operating an illumination system, said illumination system comprising a plurality of light emitters and color sensors, said method comprising:

calibrating said illumination system, wherein said calibrating comprises;

emitting a first color of light having a first peak wavelength using a first of said plurality of light emitters;

measuring said first color of light using said plurality of color sensors;

emitting a second color of light having a second peak wavelength using said first light emitter;

measuring said second color of light using said color sensors;

calculating the shift in color space based on the measurements; and

calculating at least one first calibration matrix based on said shift in colors space;

receiving data regarding colors that are to be emitted by said illumination system; and

controlling said plurality of light emitters to emit said colors;

monitoring light emitted by said light emitters using said plurality of color sensors;

applying said at least one calibration matrix to data representative of the monitored light; and

transmitting instructions to said light emitters based on said data having said calibration matrix applied thereto.

19. The method of claim 18, wherein said emitting a second color of light comprises shifting the peak wavelength emitted by said at least one light emitter in a first direction.

20. The method of claim 19, and further comprising emitting a third color of light using said at least one light emitter, wherein said emitting a third color of light comprises shifting the peak wavelength emitted by said at least one light emitter in a second direction opposite said first direction, and wherein said calculating the shift includes calculating the shift in color space of said third color of light.

21. The method of claim 18, wherein said second color of light differs from said first color of light by approximately one nanometer.

22. The method of claim 18, wherein said emitting a second color of light comprises changing the temperature of said at least one light emitter from the temperature of said at least one light emitter during emission of said first color of light.

23. The method of claim 18, wherein said emitting a second color of light comprises changing the current flow through said at least one light emitter from the current flow of said at least one light emitter during emission of said first color of light.

24. The method of claim 18, wherein said at least one emitter is a light emitting diode.