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Generating light by color mixing

A technology of color mixing, shading, applied in advantageous fields of application of the device

Inactive Publication Date: 2009-08-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in an undesired change in the LED chromaticity value controlled by the amplitude modulation
Adapting the intensity of the display light source with amplitude modulation is often expected to improve the contrast and grayscale resolution of dark pictures because, for example, the grayscale resolution of a PWM-controlled display is limited by the shortest possible circuit time of the PWM

Method used

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  • Generating light by color mixing

Examples

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Embodiment Construction

[0029] figure 1 is a diagram showing the xy-color space with locus 1 showing the xy-chromaticity values ​​of a monochromatic light source with a wavelength from 380 nm to 780 nm. Also, a typical color gamut 2 for display applications is shown. However, Gamut 2 is only one example of a possible ideal gamut. figure 1 Additionally shown are two further color gamuts 3 and 4 of a typical setup for light generation with color mixing of red, green and blue LEDs for two different temperatures. Gamut 3 represents the chromaticity values ​​that can be obtained with the lighting device at a temperature of 40° C., and gamut 4 represents the chromaticity values ​​that can be obtained with an RGB arrangement of LEDs at 100° C. in the xy-color space. Depend on figure 1 It can be concluded that the color gamut 3, 4 is temperature dependent and thus as outlined above it is difficult to provide a device or method for producing light by color mixing in which a constant chromaticity value of l...

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Abstract

The present invention relates to a method of generating light with a predetermined chromaticity value of a color gamut by color mixing of the light emitted by a plurality of light sources, each of which emits light with a primary color, the light sources being capable of emitting light with at least three primary colors, wherein at least a first and a second light source are used to emit light of at least one primary color. The object to provide a simple method of generating light with a predetermined and constant chromaticity value of a color gamut by color mixing of the light emitted by a plurality of light sources, which can even be advantageously used in display applications sequentially displaying primary colors, is achieved in that said first and said second light source emit light with different peak and / or dominant wavelengths, the chromaticity of the primary color generated by color mixing of the light emitted from said first and said second light source being adjusted to a predetermined and constant chromaticity value by controlling the ratio of intensities of said first and said second light source, and said chromaticity value of said primary-color light generated by color mixing is used to generate light by color mixing with the light of other primary color light sources.

Description

technical field [0001] The invention relates to a method for producing light having predetermined chromaticity values ​​in a color gamut by color mixing light emitted by a plurality of light sources. Each of the light sources emits light having a primary color, wherein the light sources are capable of emitting light having at least three primary colors, and at least first and second light sources are configured to emit light of at least one primary color. Further, the invention relates to a device for generating and emitting light with predetermined chromaticity values ​​in a color gamut by color mixing and to advantageous applications of the device. Background technique [0002] Methods of producing light (eg, white light) with predetermined chromaticity values ​​in a color gamut by color mixing primary colors are well known in the art. In this patent application, the term "color gamut" is used for the two-dimensional area in the color space where chromaticity values ​​are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCG03B21/2033G03B21/2053G03B21/20H05B33/0866H05B33/0869H05B33/0872G03B33/12G03B21/206H05B45/24H05B45/22H05B45/20H05B45/28
Inventor C·德佩
Owner KONINK PHILIPS ELECTRONICS NV