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Illumination device and method for controlling an illumination device

A technology of lighting equipment and flux, applied in the direction of lighting devices, light sources, electrical components, etc.

Inactive Publication Date: 2008-12-24
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the mixed colors are measured, a complex deconvolution circuit is required to obtain the individual color points of different colored LEDs

Method used

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  • Illumination device and method for controlling an illumination device
  • Illumination device and method for controlling an illumination device
  • Illumination device and method for controlling an illumination device

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Embodiment Construction

[0026] figure 1is a block diagram illustrating a dimmable lighting device 100 in accordance with the presently preferred embodiment of the present invention. In this exemplary embodiment, lighting device 100 includes three LED light sources: red 102 , green 103 , and blue 104 , each connected to a corresponding driver circuit 105 , 106 , 107 . More than 3 light sources of different colors can of course be used, as is known to the person skilled in the art. Also, a single light source or a string of light sources of the same color may be used.

[0027] When the lighting device 100 is powered on, the lighting control circuit 108 will obtain the desired color to be emitted by the lighting device 100 from the user interface 109, which is connected to the lighting control circuit 108 either through a wired connection or a wireless connection. User interface 109 may include user input devices, such as buttons and adjustable controls, for generating signals or voltages that may be ...

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Abstract

The present invention relates to a method for controlling an illumination device (100), the illumination device (100) comprising a flux sensing unit (101) and at least two differently colored light sources (102, 103, 104), the method comprising the steps of switching on and off each of the light sources according to a predefined pattern, acquiring measurement values by means of the flux sensing unit at predetermined intervals in accordance with the predefined pattern, calculating a color point for each of the light sources based on the measurement values, calculating a difference between the color points and corresponding reference color points, and adjusting an analog current drive level of the light sources, wherein the difference is minimized such that a desired color is obtained. The present invention provides for the possibilities to in a more accurate way correct for the color changes due to change in drive current, temperature, and aging effects. Furthermore, the control method according to the present invention does not require a factory calibration, or knowledge of batch specific binning information, for obtaining the current or temperature related characteristics of the light sources, which significantly reduces the cost normally related to factory calibration and batch specific binning information. Furthermore, the present invention relates to an illumination device (100) comprising means for performing such a method.

Description

technical field [0001] The invention relates to a method for controlling a lighting device. The invention also relates to a lighting device comprising means for carrying out such a method. Background technique [0002] Recently, there have been many advances in increasing the brightness of light emitting diodes (LEDs). As a result, light emitting diodes have become sufficiently bright and cheap to be used as light sources in, for example, lighting systems such as adjustable color lamps, direct view liquid crystal displays (LCDs) and front and rear projection displays. [0003] By mixing LEDs of different colors, any number of colors, such as white, can be produced. Color-tunable lighting systems are typically constructed using a range of primary colors, in one example, three primary colors: red, green, and blue. The color of the light produced is determined by the color of the LEDs used and the mixing ratio. In order to produce "white", all 3 LEDs must be on. [0004] T...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/22H05B45/28H05B45/20H05B45/46H05B45/37
Inventor E·J·梅杰C·马蒂尼V·舒尔茨M·温特P·阿姆布罗休森
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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