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Method for dimming a light generating system for generating light with a variable color

一种调暗、颜色的技术，应用在照明系统领域

Inactive Publication Date: 2009-04-29
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this disclosure aims to keep the color point constant, but at the expense of light intensity

Method used

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  • Method for dimming a light generating system for generating light with a variable color
  • Method for dimming a light generating system for generating light with a variable color
  • Method for dimming a light generating system for generating light with a variable color

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Embodiment Construction

[0015] figure 1 The xy chromaticity diagram is schematically represented. This diagram is well known, so its description is kept to a minimum. Points (1, 0), (0, 0) and (0, 1) represent ideal red, blue and green respectively, which are virtual colors. Curve 1 represents pure spectral colors. Wavelengths are expressed in nanometers (nm). Dashed line 2 connects the ends of curve 1. Region 3 enclosed by curve 1 and dashed line 2 contains all visible colors; in contrast to the pure spectral colors of curve 1, the colors of region 3 are mixed colors which can be obtained by mixing two or more pure spectral colors. Conversely, each visible color can be represented by a coordinate in a chromaticity diagram; a point in the chromaticity diagram will be represented as a "color point".

[0016] It should be noted that it should be clear to those skilled in the art that color representations of different graphs, such as RGB chromaticity diagrams, can also be used.

[0017] When two ...

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PUM

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Abstract

A method for dimming an illumination system (20) capable of emitting light (L) with a variable color is described. The illumination system (20) comprises three dimmable light sources (21, 22, 23) generating respective lights (L1, L2, L3) having respective, mutually different colors (C1, C2, C3). The method comprises the step of reducing the light intensities (I1, I2, I3) of the three dimmable light sources (21, 22, 23) while maintaining the color point until one of said light sources (21) reaches a lower dim limit (IMIN)- The method further comprises the step of maintaining the light intensity (I1) of said one light source (21) at its lower dim limit (IMIN) and reducing the light intensities (I2, I3) of the two other dimmable light sources (22, 23) in such a manner that the hue is maintained.

Description

technical field [0001] The present invention relates generally to a lighting system for generating light with variable colors, and more particularly to a control system for driving a lighting system including three fluorescent lamps of mutually different colors. Background technique [0002] Systems for generating light with variable colors are known. See, for example, US-5384519, which discloses a system with three independent light sources, each light source producing light of a specific color, the three specific colors being different from each other. The light produced by the system generally comprises a mix of light produced by three separate light sources, the color of the light mix being a mix of these three specific colors. In order to vary the color of the light mix, the relative light intensities of the three separate light sources can be set in a certain ratio. [0003] Each light source has a nominal output power, and each light source can be dimmed so that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/392
CPCH05B41/3921
Inventor G·W·范德维恩W·J·里特曼
Owner KONINK PHILIPS ELECTRONICS NV