Polar coordinate-based non-polar dimming and color modulation method

A stepless dimming and polar coordinate technology, applied in the field of dimming, can solve the problems of inability to adjust color temperature and luminosity, change of luminosity, etc., and achieve the effect of improved dimming accuracy, high precision, and uniform and smooth dimming process.

Active Publication Date: 2018-08-14
HANGZHOU DIANZI UNIV
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Problems solved by technology

This algorithm reduces the amount of calculation, but by changing the duty cycle Dw and Dc of the cold and warm light sources for color mixing to achieve color temperature adjustment, it will cause changes in the luminosity under color temperature adjustment, and the color temperature and luminosity cannot be adjusted independently

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  • Polar coordinate-based non-polar dimming and color modulation method
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  • Polar coordinate-based non-polar dimming and color modulation method

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Embodiment Construction

[0016] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0017] Color temperature is a unit of measurement that includes color costs in light, and refers to the color that an absolute black body presents after being heated from absolute zero (-273°C). According to the CIE chromaticity calculation model, the chromaticity coordinates corresponding to the target color temperature can be established, and the Tamaru team proposed the color temperature calculation formula:

[0018] T=669A 4 -779A 3 +3360A 2 -7047A+5652 (1.1)

[0019] In the formula (1.1), T is the calculated color temperature value, A is the reciprocal of the slope of the isocolor temperature line, and the calculation formula is:

[0020...

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Abstract

The invention provides a polar coordinate-based non-polar dimming and color modulation method. By combination of a Glasman color mixing principle, a chroma and luminosity parameter algorithm model ina polar coordinate is established; chroma and luminosity are converted into two paths of PWM controlled quantity, so that independent regulation of luminosity and color temperature is realized, and quick setting of luminosity and color temperature according to needs can be achieved; specific to the problems of shaking and flickering in the dimming process, a dynamic smooth dimming mechanism is proposed, and dimming experience is improved; and compared with the existing method, dimming accuracy in the invention is highly improved, the algorithm realization complexity is low, and quite high practical value is achieved.

Description

technical field [0001] The invention relates to the technical field of dimming, in particular to a polar coordinate-based stepless dimming and toning method. Background technique [0002] The International Commission on Illumination (CIE) uses the three attributes of hue, brightness and saturation to describe the comprehensive index of color - chromaticity. Different points on the chromaticity diagram represent different chromaticity. According to the relevant theory of chromaticity, the new color formed by combining any two colors in the chromaticity diagram is located on the line segment of the two colors. According to Grassmann's law of color mixing, the chromaticity of a new color depends on the proportion of each color before mixing. [0003] The color temperature of LED is determined by the light source. Different light sources have different color rendering index. According to the color temperature of the light source, it can be roughly divided into warm white ligh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10H05B45/20
Inventor 陈科明江倩孙萌杨小雨罗国清
Owner HANGZHOU DIANZI UNIV
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