System and method for color creation and matching

• US 8,384,294 B2
• Filed: 10/05/2010
• Issued: 02/26/2013
• Est. Priority Date: 10/05/2010
• Status: Active Grant

• Current Assignee: Electronic Theatre Controls Incorporated
• Original Assignee: Electronic Theatre Controls Incorporated
• Inventors: Hatley, Troy Bryan, Robbins, Timothy George, Wood, Mike
• Primary Examiner(s): Le, Tung X
• Application Number:
  US12/898,127
• Publication Number:
  US 20120081010A1
• Time in Patent Office: 875 Days
• Field of Search: 315149-159, 315/291, 315/294, 315/297, 315307-309, 315/312, 345/589, 345/591, 345/597, 345/600
• US Class Current: 315/149
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

Systems and methods for controlling an output of a luminaire. The luminaire uses stored spectral information for light sources within the luminaire to determine a coordinate for each light source within a color space. A desired output color is also converted to a coordinate within the color space. The distance between the desired output color coordinate and each of the coordinates corresponding to the light sources is calculated to select initial control values for the light sources. The initial control values for each light source are individually modified by a step size value, the total output of the luminaire is calculated and converted to a coordinate within the color space, and the distance between the total luminaire output coordinate and the desired color coordinate is calculated. The control values for the light sources are iteratively modified until the luminaire output coordinate is within a threshold value of the desired color output.

Claims

1. A method of controlling the output of a light fixture that includes a light source, the method comprising:

determining a desired color location within a color space;

determining a light source location within the color space for the light source;

calculating a first separation between the desired color location and the light source location;

setting a control value for the light source based on the first separation;

modifying the control value for the light source;

calculating a light fixture output based on the modified control value for the light source;

determining a light fixture output location within the color space based on the light fixture output;

calculating a second separation between the light fixture output location and the desired color location; and

driving the light source based on the modified control value.

2. The method of claim 1, further comprising comparing the second separation to a threshold value, wherein the driving the light source is based on the comparison.

3. The method of claim 1, further comprising obtaining spectral information for the light source before determining the light source location.

4. The method of claim 1, further comprising normalizing the control value for the light source.

5. The method of claim 1, further comprising calculating a first light fixture output based on the control value for the light source.

6. The method of claim 5, further comprising determining a first light fixture output location within the color space based on the first light fixture output.

7. The method of claim 6, further comprising calculating a third separation between the first light fixture output location and the desired color location.

8. The method of claim 7, further comprising comparing the third separation to a threshold value, wherein the driving the light source is based on the comparison.

9. A method of controlling the output of a light fixture that includes a light source, the method comprising the steps of:

(1) determining a desired color location within a color space;

(2) determining a light source location within the color space for the light source;

(3) calculating a first separation between the desired color location and the light source location;

(4) setting a control value for the light source based on the first separation;

(5) modifying the control value for the light source;

(6) calculating a light fixture output based on the modified control value;

(7) determining a light fixture output location within the color space based on the calculated light fixture output;

(8) calculating a second separation between the light fixture output location and the desired color location;

(9) comparing the second separation to a threshold value;

(10) iteratively performing steps 5-9; and

(11) driving the light source based on the modified control value.

10. The method of claim 9, further comprising the step of obtaining spectral information for the light source before determining the light source location.

11. The method of claim 9, further comprising the step of normalizing the control value for the light source.

12. The method of claim 9, further comprising the step of calculating a first light fixture output based on the control value for the light source.

13. The method of claim 12, further comprising the step of determining a first light fixture output location within the color space based on the first light fixture output.

14. The method of claim 13, further comprising the step of calculating a third separation between the first light fixture output location and the desired color location.

15. The method of claim 14, further comprising the step of comparing the third separation to the threshold value, wherein the driving the light source is based on the comparison.

16. A light fixture comprising:

a light source; and

a controller configured to

determine a desired color location within a color space;

determine a light source location within the color space for the light source;

calculate a first separation between the desired color location and the light source location;

set a control value for the light source based on the first separation;

modify the control value for the light source;

calculate a light fixture output based on the modified control value;

determine a light fixture output location within the color space based on the light fixture output;

calculate a second separation between the light fixture output location and the desired color location;

compare the second separation to a threshold value; and

driving the light source based on the modified control value.

17. The light fixture of claim 16, wherein the controller is further configured to access spectral information for the light source before determining the light source location.

18. The light fixture of claim 16, wherein the controller is further configured to normalize the control value for the light source.

19. The light fixture of claim 16, wherein the light source is one of a red light emitting diode (“

LED”

), a red-orange LED, an amber LED, a green LED, a cyan LED, a blue LED, and an indigo LED.

20. The light fixture of claim 16, wherein the controller is further configured to calculate a first light fixture output based on the control value for the light source.

21. The light fixture of claim 20, wherein the controller is further configured to determine a first light fixture output location within the color space based on the calculated first light fixture output.

22. The light fixture of claim 21, wherein the controller is further configured to calculate a third separation between the first light fixture output location and the desired color location.

23. The light fixture of claim 22, wherein the controller is further configured to compare the third separation to the threshold value, wherein the driving the light source is based on the comparison.