Lighting system for color control

• US 7,652,236 B2
• Filed: 04/19/2006
• Issued: 01/26/2010
• Est. Priority Date: 04/28/2005
• Status: Expired due to Fees

• Current Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Cortenraad, Hubertus Maria Rene, Franse, Jelm, Deurenberg, Peter Hubertus Franciscus, Bergman, Anthonie Hendrik
• Primary Examiner(s): Luu; Thanh X
• Assistant Examiner(s): Legasse, Jr.; Francis M
• Application Number:
  US11/912,341
• Publication Number:
  US 20080185499A1
• Time in Patent Office: 1,378 Days
• Field of Search: 250/205, 250/226, 356/402, 356/405, 356/406, 356/407, 362/227, 362/231, 362/276, 362/230
• US Class Current: 250/205
• CPC Class Codes: F21V 23/0457 the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A lighting arrangement provides light of a desired color. The arrangement includes light sources that each emit light of a respective color that, when mixed, is perceivable as the desired color. A light detector is configured to receive light reflected by a color reference surface having a specific reference color. A controller is configured to analyzes a signal from the light detector and recognizes the color of the received light as the color of the reference surface. The controller controls the light sources such that the desired color corresponds to the color of the color reference surface.

Claims

1. A lighting arrangement configured to provide light of a desired color comprising:

a plurality of light sources, each light source configured to emit light of a respective color that, when mixed, is perceivable as the desired color,

a light detector configured to receive light reflected by a color reference surface having a specific reference color, and configured to provide a signal indicative of said received light, wherein the signal is provided in response to inserting the color reference surface into a slit, and

a controller configured to analyze the signal from the light detector and thereby being capable of recognizing the color of the received light as the color of the reference surface, and configured to control the light sources in response to the signal provided by inserting the color reference surface into a slit such that the desired color of the light provided by the lighting arrangement corresponds to the color of the color reference surface.

2. The lighting arrangement according to claim 1, further comprising a source of white light configured to illuminate the color reference surface, and where the light detector comprises a color sensor configured to detect the white light after being reflected from the color reference surface.

3. The lighting arrangement according to claim 1, where the light detector comprises a single photo detector and where the controller is configured to sequentially control the light sources to emit light for a respective duration.

4. The lighting arrangement according to claim 1, wherein the light detector is configured to also detect direct light from the light sources and where the controller is configured to control the light sources based also on the detected direct light.

5. The lighting arrangement according to claim 1, further comprising memory means for storing information regarding the control of the light sources such that a plurality of desired colors are stored and where the stored colors are selectable.

6. The lighting arrangement according to claim 1, further comprising a diffuser.

7. The lighting arrangement according to claim 1, where the light sources conform to the RGB system.

8. The lighting arrangement according to claim 1, where the light sources are light emitting diodes.

9. The lighting arrangement according to claim 1, where the light sources are color fluorescence lamps.

10. A lighting system configured to provide light of a desired color comprising a plurality of lighting arrangements according to claim 1 and wherein each lighting arrangement further comprises communication means for communicating a signal that enables the controller in each arrangement to control the light sources such that the desired color corresponds to the color of the color reference surface.

11. The lighting arrangement of claim 1, wherein the controller is configured to control the light sources in response to detection of a change in ambient light due to the color reference surface being held close to the light detector.

12. The lighting system according to claim 2, where the color sensor comprises a plurality of photo diodes arranged with color filters.

13. The lighting arrangement according to claim 2, where the color sensor is a CCD device.

14. The lighting arrangement according to 2, where the controller is configured to continuously analyze the detected light and to continuously control the light sources.

15. The lighting arrangement according to claim 2, where the controller is configured to analyze the detected light and to control the light sources as a response to a triggering signal.

16. A method for providing light of a desired color comprising the acts of:

controlling a plurality of light sources to emit light of a respective color that, when mixed, is perceivable as the desired color,

receiving light reflected by a color reference surface having a specific reference color,

providing a signal indicative of said received light in response to pointing a pointing device to the color reference surface,

analyzing the signal and thereby recognizing the color of the received light as the color of the reference surface, and

controlling the light sources such that the desired color corresponds to the color of the color reference surface as determined by the analyzing act from the signal obtained by pointing the pointing device to the color reference surface.

17. The method according to claim 16, wherein the control of the light sources is performed such that the light sources sequentially emit light for a respective duration.

18. The method according to claim 16, wherein the analysis and the control is performed continuously.

19. The method according to claim 16, wherein the analysis and the control is performed as a response to a triggering signal.

20. The method according to 16, further comprising storing information regarding the control of the light sources such that a plurality of desired colors are stored and where the stored colors are selectable.

21. The method according to claim 16, wherein light is also detected directly from the light sources and where the light sources are controlled based also on the detected direct light.

22. The method of claim 16, wherein the providing act is performed in response to detection of a change in ambient light due to the color reference surface being held close to a detector that receives the light reflected by the color reference surface.

23. A color control device for controlling a lighting arrangement to provide light of a desired color, said lighting arrangement comprising a plurality of light sources, each light source configured to emit light of a respective color that, when mixed, is perceivable as the desired color, said color control device being characterized by:

a light detector configured to receive light reflected by a color reference surface having a specific reference color, and configured to provide a signal indicative of said received light, and

a controller configured to analyze the signal from the light detector and thereby being capable of recognizing the color of the received light as the color of the reference surface, and configured to control the light sources in the lighting arrangement in response to inserting the color reference surface into a slit such that the desired color corresponds to the color of the color reference surface for providing the light of the desired color corresponding to the color of the color reference surface.

24. The color control device of claim 23, wherein the controller is configured to control the light sources in response to detection of a change in ambient light due to the color reference surface being held close to the light detector.

25. The color control device of claim 23, wherein the light detector is included in a pointing device, and the signal is provided in response to pointing the light detector to the color reference surface.