CN111326641A - Method for reducing blue light harm of white light emitting diode - Google Patents

Method for reducing blue light harm of white light emitting diode Download PDF

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CN111326641A
CN111326641A CN202010127541.6A CN202010127541A CN111326641A CN 111326641 A CN111326641 A CN 111326641A CN 202010127541 A CN202010127541 A CN 202010127541A CN 111326641 A CN111326641 A CN 111326641A
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陈志忠
聂靖昕
陈怡帆
詹景麟
陈毅勇
潘祚坚
焦飞
康香宁
童玉珍
张国义
沈波
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Abstract

The invention discloses a method for reducing blue light harm of a white light-emitting diode. The invention adopts purple light and sky blue light to mix to obtain the visual effect of blue light, and simultaneously eliminates blue light components, thereby effectively reducing the blue light harm of the white light LED, reducing the damage to retina of eyes and improving the biological safety of light; possible areas of green light and red light are obtained near three vertexes on a CIE1931 chromaticity diagram, and yellow light components are added to obtain higher color rendering property of the mixed light source; by utilizing the invention, the white light source has good color rendering property while reducing the harm of blue light, and can provide better visual comfort; dynamic white light with adjustable color temperature can be obtained, so that different color temperatures correspond to different adaptive ranges; the invention has the advantages of low blue light harm, high color rendering property, adjustable color temperature and the like.

Description

Method for reducing blue light harm of white light emitting diode
Technical Field
The invention relates to the field of semiconductor illumination, in particular to a method for reducing blue light harm of a white light emitting diode.
Background
Under general conditions, there are two ways of using LED to emit white Light required for illumination, one is to use blue LED to excite phosphor powder, the Light emitted by phosphor powder is mixed with the blue Light of LED to obtain white Light, the other is to use red, green and blue LEDs to emit Light, and the white Light is obtained after mixing, therefore, the blue Light is an indispensable component in white Light LED illumination, and according to the national standard photo-biological safety standard of lamps and lamp systems (GB/T20145-2006), the short wavelength (about 415-BFor evaluation of the blue light hazard severity of the light source:
Figure BDA0002394848930000011
where S (λ) is the spectral power distribution of the light source and B (λ) is the blue-ray-hazard weighting function, as shown in FIG. 1, ηBη for reflecting the severity of blue light hazard of light source under the same light powerBThe smaller the blue light hazard of the light source, the better the photobiosafety.
Filtering the blue component of white light is a common method for reducing the blue light hazard (CN201711461926.0), but this method all results in the reduction of the color reduction degree of the blue light by the white light illumination, and reduces the color rendering property of the white light illumination. The work on reducing the blue light hazard (CN201910096408.6) uses a mixture of four primary colors of red, yellow, blue-green, and the blue light hazard is reduced by increasing the proportion of red and yellow light to reduce the blue light component, but the blue light hazard at high color temperature cannot be effectively reduced because of maintaining high color rendering property. In summary, an LED light source with adjustable color temperature, high color rendering, and low blue light hazard is still an urgent problem to be solved.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides a method for reducing blue light hazard of a white light emitting diode, which is based on the Grassmann color mixing law, and adopts purple and sky blue light to mix to obtain the visual effect of blue light, and simultaneously eliminates blue light components and reduces blue light hazard. The possible areas of green light and red light are obtained near three vertexes on the CIE1931 chromaticity diagram, and meanwhile, yellow light components are added, so that the mixed light source is high in color rendering property.
The invention discloses a method for reducing blue light harm of a white light-emitting diode, which comprises the following steps:
1) the light emitting diode LED with five colors of purple light, sky blue light, green light, yellow light and red light is adopted, and the purple light and the sky blue light are mixed to obtain the visual effect of the blue light, so that the damage of the blue light is reduced;
2) according to peak wavelength lambdaPAnd the half width of the spectrum delta lambda0.5Calculating the half-width of the spectrum Delta lambda of the monochromatic LED0.5：
Figure BDA0002394848930000021
3) Passing the peak wavelength lambda according to a monochromatic LED spectral modelPAnd the half width of the spectrum delta lambda0.5Calculating the spectrum S (lambda ) of the monochromatic LEDP，Δλ0.5)：
Figure BDA0002394848930000022
The spectra of the violet, sky-blue, green, yellow and red leds, calculated from the above formula, are denoted as SP(λ)、SA(λ)，、SG(λ)、SY(lambda) and SR(λ)；
4) Mixing five monochromatic LEDs of purple light, sky blue light, green light, yellow light and red light in proportion, and recording the spectrum of the mixed white light as SW(λ)：
SW(λ)＝rP·SP(λ)+rA·SA(λ)+rG·SG(λ)+rY·SY(λ)+rR·SR(λ)
Wherein r isP、rA、rG、rYAnd rRThe proportion of purple light, sky blue light, green light, yellow light and red light which participate in light mixing is respectively adopted;
5) setting the color temperature T of the mixed white light, and calculating the spectrum S of the black body radiation at the color temperatureB(λ，T)：
Figure BDA0002394848930000023
Wherein, α -3.743 × 108W·μm4/m2，β＝1.438×104μm·K；
6) Calculating the color coordinate (x) of the black body radiation under the color temperature according to the spectrum of the black body radiationB，T，yB，T)：
Figure BDA0002394848930000024
Wherein,
Figure BDA0002394848930000025
is the tristimulus value, Δ λ is the wavelength interval;
7) calculating the Mixed white light SW(λ) corresponding color coordinate (x)W，yW) The color coordinates of the mixed white light are equal to those of the black body radiation, namely, the color coordinates of the mixed white light fall on a black body radiation color coordinate curve, so that pure white light is obtained, and the visual comfort level is improved:
Figure BDA0002394848930000031
namely:
Figure BDA0002394848930000032
8) for mixed light ratio rP、rA、rG、rYAnd rRCalculating relative mixture ratio by five variables, fixing one variable to be equal to 1, and expressing two variables in the remaining four variables by other three variables, so that for the two linear equations of the equation set in the step 7), only two independent variables are used for optimizing the relative mixture ratio;
9) setting a limiting condition about white light color rendering, optimizing the two independent variables selected in the step 8) by adopting an enumeration method to obtain a mixed light ratio which meets the limiting condition of the color rendering and has the minimum harm of blue light, and calculating a mixed white light parameter under the mixed light ratio;
10) changing the setting of the color temperature, and repeating the steps 5) to 9) to obtain the mixed light ratio and the corresponding mixed white light parameters under different color temperatures;
11) selecting light emitting diodes with other peak wavelength combinations in the peak wavelength range shown in the step 1), and repeating the steps 2) to 10) to obtain mixed white light parameters of the light emitting diodes with different peak wavelength combinations;
12) and comprehensively considering the blue light harm and the white light color rendering property, selecting a light emitting diode with a proper peak wavelength and a corresponding mixed light ratio under the set color temperature to obtain the white light with adjustable color temperature, low blue light harm and high color rendering property.
In the step 1), the corresponding peak wavelengths of the Light Emitting Diodes (LEDs) of purple light, sky blue light, green light, yellow light and red light are 380-415 nm, 460-480 nm, 510-530 nm, 540-570 nm and 620-650 nm respectively.
In the step 5), the color temperature adjusting range of the mixed white light is 2500-7000K, and the interval of the color temperature is 300-1000K.
In step 9), the enumeration method is as follows: fixing one variable as 1, enumerating two possible independent variables in sequence, calculating the rest two variables according to two linear equations in the step 7), and calculating the mixed white light spectrum S according to a formula in the step 4)W(λ), and calculating the mixed white light parameter accordingly. The mixed white light parameters comprise blue light harm and color rendering parameters of the mixed white light; the color rendering parameters include a color rendering index CRI, a color rendering fidelity Rf, and a saturation Rg. The white light rendering property is defined as follows: CRI>85、Rf>80 and Rg>100。
The invention has the advantages that:
the invention adopts the purple light and the sky blue light to mix to obtain the visual effect of the blue light, effectively reduces the blue light harm of the white light LED, reduces the damage to the retina of human eyes, and improves the biological safety of the light; by utilizing the invention, the white light source has good color rendering property while reducing the harm of blue light, and can provide better visual comfort; dynamic white light with adjustable color temperature can be obtained, so that different color temperatures correspond to different adaptive ranges; the invention has the advantages of low blue light harm, high color rendering property, adjustable color temperature and the like.
Drawings
FIG. 1 is a graph of a blue-ray hazard weighting function B (λ);
FIG. 2 is a relative spectrum of a monochromatic LED used in one embodiment of the method for reducing blue light hazard of a white LED of the present invention;
FIG. 3 is a spectrum diagram of a mixed white light obtained by an embodiment of the method for reducing the blue light hazard of a white light LED according to the invention;
FIG. 4 is a bar graph of CRI, Rf, and Rg of a mixed white light obtained according to an embodiment of the method for reducing blue light hazard of a white light LED;
FIG. 5 shows blue light hazard radiation efficiency η of mixed white light obtained by one embodiment of the method for reducing blue light hazard of white light emitting diode according to the inventionBComparison with other common light sources.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawing.
The method for reducing the blue light hazard of the white light emitting diode comprises the following steps:
1) the light emitting diode LEDs with five colors of purple light, sky blue light, green light, yellow light and red light are adopted, and the corresponding peak wavelengths are 385 nm, 467 nm, 524 nm, 564 nm and 632nm respectively;
2) according to peak wavelength lambdaPAnd the half width of the spectrum delta lambda0.5Calculating the half-width of the spectrum Delta lambda of the monochromatic LED0.5：
Figure BDA0002394848930000041
The corresponding half widths of the spectra of the light emitting diodes LED of the five colors of violet, sky blue, green, yellow and red are 10.1, 23.0, 32.0, 44.4 and 17.4nm, respectively, as shown in fig. 2;
3) passing the peak wavelength lambda according to a monochromatic LED spectral modelPAnd the half width of the spectrum delta lambda0.5Calculating the spectrum S (lambda ) of the monochromatic LEDP，Δλ0.5)：
Figure BDA0002394848930000042
The spectra of the violet, sky-blue, green, yellow and red leds, calculated from the above formula, are denoted as SP(λ)、SA(λ)，、SG(λ)、SY(lambda) and SR(λ)；
4) Will be provided withPurple light, sky blue light, green light, yellow light and red light are mixed according to a proportion, and the spectrum of the mixed white light is marked as SW(λ)：
SW(λ)＝rP·SP(λ)+rA·SA(λ)+rG·SG(λ)+rY·SY(λ)+rR·SR(λ)
Wherein r isP、rA、rG、rYAnd rRThe proportion of purple light, sky blue light, green light, yellow light and red light which participate in light mixing is respectively adopted;
5) the color temperature can be adjusted within the range of 2500-7000K, the color temperature T of the mixed white light is set, and the spectrum S of the black body radiation under the color temperature is calculatedB(λ，T)：
Figure BDA0002394848930000051
Wherein, α -3.743 × 108W·μm4/m2，β＝1.438×104μm·K；
6) Calculating the color coordinate (x) of the black body radiation under the color temperature according to the spectrum of the black body radiationB，T，yB，T)：
Figure BDA0002394848930000052
Wherein, among others,
Figure BDA0002394848930000053
the tristimulus value is shown, and the delta lambda is the wavelength interval, and is generally 1 nm-5 nm;
7) calculating the Mixed white light SW(λ) corresponding color coordinate (x)W，yW) To be equal to the color coordinates of the black body radiation:
Figure BDA0002394848930000054
namely:
Figure BDA0002394848930000055
8) for mixed light ratio rP、rA、rG、rYAnd rRCalculating relative light mixing ratio by using five variables, and calculating rRFixed equal to 1 and rPAnd rATwo variables are represented by rG，rYAnd rRVariable expression, so that for the two linear equations of the equation set in the step 7), only two independent variables are used for optimizing the relative light mixing ratio;
9) setting a defined condition about white light color rendering, and optimizing two independent variables selected in the step 8) by adopting an enumeration method: the enumeration range is generally 0-10, because the light mixing ratio of green light and yellow light in the general mixed white light cannot exceed 10 times of the light mixing ratio of red light; the enumeration interval is generally 0.01-0.1, the smaller the interval is, the higher the calculation precision is, the more optimized the result is, but the longer the calculation time is, the mixed light ratio which meets the limited condition of white light color rendering property and has the minimum harm of blue light is obtained, and the mixed white light parameter under the mixed light ratio is calculated;
10) changing the setting of color temperature to 3000K, 4000K, 5000K, 6000K and 7000K respectively, and repeating the steps 5) to 9) to obtain the mixed light ratio and corresponding mixed white light parameters under different color temperatures;
11) selecting light emitting diodes with other peak wavelength combinations within corresponding peak wavelength ranges of 380-415 nm, 460-480 nm, 510-530 nm, 540-570 nm and 620-650 nm, and repeating the steps 2) -10) to obtain mixed white light parameters of the light emitting diodes with different peak wavelength combinations;
12) and comprehensively considering the blue light harm and the color rendering property, selecting a light emitting diode with proper peak wavelength and a corresponding mixed light ratio under the set color temperature to obtain the white light with adjustable color temperature, low blue light harm and high color rendering property.
Calculating η blue light harmful radiation efficiency of the mixed white light according to the spectrum of the mixed white lightBColor rendering index CRI, color rendering fidelity Rf, and saturation Rg. Wherein, FIG. 5 shows a method of the present inventionBlue light hazard radiation efficiency η of white light and other light sources prepared by the methodBFIG. 4 shows the color rendering parameters of the mixed white light prepared by the method of the present invention, including the color rendering index CRI, the color rendering fidelity Rf, and the saturation Rg.. As can be seen from FIG. 5, the blue light of the white light obtained in the present invention has a radiation efficiency of η which is harmful to the blue lightBFar lower than other common lighting sources, equivalent to the blue light hazard of incandescent lamps, and with a blue light hazard radiation efficiency of ηBThe increase of the color temperature is not obvious, which shows that the white light source obtained by the method of the invention has very low blue light hazard at different color temperatures. As can be seen from FIG. 4, the white light obtained in the invention always keeps good color rendering property in the process of changing the color temperature from 2500-7000K: CRI>84.9,Rf>80.4,Rg>98.1。
Blue light hazard radiation efficiency
Figure BDA0002394848930000061
Wherein S isW(λ) is the spectrum of the mixed white light, B (λ) is the blue light hazard weighting function, as shown in fig. 1, Δ λ is the wavelength interval, typically 1nm or 5 nm; method for calculating color rendering index CRI according to reference [1]](ii) a Reference is made to reference 2 for methods for calculating parameters of color rendering fidelity Rf and saturation Rg]。
In summary, the invention provides a method for reducing blue light harm of a white light emitting diode, by utilizing the method, the blue light harm of the white light emitting diode is greatly reduced, and meanwhile, good color rendering is kept, in addition, the color temperature of the obtained white light is adjustable, and the low blue light harm and the high color rendering can be kept within the adjusting range of 2500-7000K. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
Reference documents:
[1] GB/T5702-1985 light source color rendering evaluation method
[2]Illuminating Engineering Society of North America.IES TM-30-15,IESMethod for Evaluating Light Source Color Rendition[M].IlluminatingEngineering Society of North America,2015.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.

Claims (5)

1. A method for reducing the blue light hazard of a white light emitting diode, the method comprising the steps of:
1) the light emitting diode LED with five colors of purple light, sky blue light, green light, yellow light and red light is adopted, and the purple light and the sky blue light are mixed to obtain the visual effect of the blue light, so that the damage of the blue light is reduced;
2) according to peak wavelength lambdaPAnd the half width of the spectrum delta lambda0.5Calculating the half-width of the spectrum Delta lambda of the monochromatic LED0.5：
Figure FDA0002394848920000011
3) Passing the peak wavelength lambda according to a monochromatic LED spectral modelPAnd the half width of the spectrum delta lambda0.5Calculating the spectrum S (lambda ) of the monochromatic LEDP，Δλ0.5)：
Figure FDA0002394848920000012
The spectra of the violet, sky-blue, green, yellow and red leds, calculated from the above formula, are denoted as SP(λ)、SA(λ)，、SG(λ)、SY(lambda) and SR(λ)；
4) Mixing purple light, sky blue light, green light, yellow light and red light in proportion to obtain mixed white light spectrum Sw(λ) satisfies:
SW(λ)＝rP·SP(λ)+rA·SA(λ)+rG·SG(λ)+rY·SY(λ)+rR·SR(λ)
wherein r isP、rA、rG、rYAnd rRThe five monochromatic LEDs of purple light, sky blue light, green light, yellow light and red light respectively participate in the light mixing proportion to form the light mixing proportion;
5) setting the color temperature T of the mixed white light, and calculating the spectrum S of the black body radiation at the color temperatureB(λ，T)：
Figure FDA0002394848920000013
Wherein, α -3.743 × 108W·μm4/m2，β＝1.438×104μm·K；
6) Calculating the color coordinate (x) of the black body radiation under the color temperature according to the spectrum of the black body radiationB，T，yB，T)：
Figure FDA0002394848920000014
Wherein, among others,
Figure FDA0002394848920000015
is the tristimulus value, Δ λ is the wavelength interval;
7) calculating the Mixed white light SW(λ) corresponding color coordinate (x)W，yW) The color coordinates of the mixed white light are equal to those of the black body radiation, namely, the color coordinates of the mixed white light fall on a black body radiation color coordinate curve, so that pure white light is obtained, and the visual comfort level is improved:
Figure FDA0002394848920000021
namely:
Figure FDA0002394848920000022
8) for mixed light ratio rP、rA、rG、rYAnd rRCalculating relative mixture ratio by five variables, fixing one variable to be equal to 1, and expressing two variables in the remaining four variables by other three variables, so that for the two linear equations of the equation set in the step 7), only two independent variables are used for optimizing the relative mixture ratio;
9) setting a limiting condition about white light color rendering, optimizing the two independent variables selected in the step 8) by adopting an enumeration method to obtain a mixed light ratio which meets the limiting condition of the color rendering and has the minimum harm of blue light, and calculating a mixed white light parameter under the mixed light ratio;
10) changing the setting of the color temperature, and repeating the steps 5) to 9) to obtain the mixed light ratio and the corresponding mixed white light parameters under different color temperatures;
11) selecting light emitting diodes with other peak wavelength combinations, and repeating the steps 2) to 10) to obtain mixed white light parameters of the light emitting diodes with different peak wavelength combinations;
12) and comprehensively considering the blue light harm and the white light color rendering property, selecting a light emitting diode with a proper peak wavelength and a corresponding mixed light ratio under the set color temperature to obtain the white light with adjustable color temperature, low blue light harm and high color rendering property.
2. The method of claim 1, wherein in step 1), the respective peak wavelengths of the violet, sky blue, green, yellow and red Light Emitting Diodes (LEDs) are 380 to 415nm, 460 to 480nm, 510 to 530nm, 540 to 570nm and 620 to 650nm, respectively.
3. The method of claim 1, wherein in the step 5), the mixed white light has a color temperature adjusting range of 2500 to 7000K and a color temperature interval of 300 to 1000K.
4. The method of claim 1, wherein in step 9), the mixed white light parameters include blue light hazard and color rendering parameters of the mixed white light; the color rendering parameters include a color rendering index CRI, a color rendering fidelity Rf, and a saturation Rg.
5. The method according to claim 1, wherein in step 9), the white color rendering is defined by: CRI >85, Rf >80, and Rg > 100.
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CN112255785A (en) * 2020-10-16 2021-01-22 安徽阳光照明电器有限公司 White light LED color mixing design method for light health and illumination system thereof
CN112594653A (en) * 2020-12-09 2021-04-02 广州市雅江光电设备有限公司 Color temperature adjustable high color rendering white light system and imaging device
CN114333617A (en) * 2021-12-17 2022-04-12 北京大学 Wide color gamut display method for improving non-visual effect

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CN106384017B (en) * 2016-11-02 2019-11-08 广东省半导体产业技术研究院 A kind of the white light LEDs design method and lamps and lanterns of specular quality

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CN106384017B (en) * 2016-11-02 2019-11-08 广东省半导体产业技术研究院 A kind of the white light LEDs design method and lamps and lanterns of specular quality
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CN114333617A (en) * 2021-12-17 2022-04-12 北京大学 Wide color gamut display method for improving non-visual effect

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