CN112255784A - Design method of white light LED (light emitting diode) with adjustable light Duv and illumination system thereof - Google Patents
Design method of white light LED (light emitting diode) with adjustable light Duv and illumination system thereof Download PDFInfo
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Abstract
The invention discloses a design method of a healthy light Duv adjustable white light LED and an illumination system thereof, wherein the method comprises the steps of taking a plurality of color coordinate points with different Duv values on an isochromatic temperature line of a target color temperature; solving the emission spectrum energy ratios of red light, green light and blue light which meet the color coordinate point corresponding to each Duv value and the white light LED, and mixing the colors according to the ratio to obtain a white light source; calculating the rhythm effect efficiency and the melatonin suppression index of each white light source, and combining the color rendering index to obtain the curve relation among the Duv value, the emission spectrum energy ratio, the color rendering index and the rhythm effect efficiency so as to obtain the optimized emission spectrum energy ratio of each Duv value under the target color temperature and the appointed color rendering index; and then, carrying out pulse width modulation dimming on each light source to achieve the optimized emission spectrum energy ratio, carrying out color mixing according to the dimmed light source to obtain a white light LED illumination system, wherein the white light LED illumination system has high rhythm action efficiency and high melatonin suppression index under the target color temperature and the specified color rendering index aiming at each Duv value.
Description
Technical Field
The invention belongs to the technical field of semiconductor illumination, and particularly relates to a design method of a white light LED with adjustable Duv for light health and an illumination system thereof.
Background
Human life is affected by circadian rhythms. The circadian rhythm is the physiological cycle of various physiological parameters of a human body within one day, and is an adaptive characteristic stored in the process of long-term evolution of the human body. When the circadian rhythm is destroyed, people face the conditions of low physiological function, neural behavior cognitive function and sleep quality, thereby seriously affecting the health of human bodies. The circadian rhythm changes with the change of external environment (such as illumination), when the human body is illuminated, the biological clock system in the human body guides and starts the chain amplification process from the light signal to the physiological signal, thereby regulating the behavior and physiological activities of the human, see the influence of illumination on the circadian rhythm of the human proposed by grand Peng (lamp and illumination, 2005, 29(1): 31-33.). Studies on circadian rhythms show that: in mammals, light regulates the circadian rhythm by activating the hypothalamic tract of the retina of the eye, is responsible for the non-visual biological effect of the human body, is connected with the biological clock system of the human brain, regulates the melatonin secretion of the pineal body and the change of physiological parameters such as cortisol, body temperature and the like in the human body through light signal inhibition, and thus regulates the functions of the human body such as sleep, alertness, emotion, cognition, immunity and the like, namely participates in the regulation and control of the circadian rhythm, which is referred to the illumination treatment for regulating the circadian rhythm proposed by Yang Chun, Liangdeng and Zhang Qing (the report of illumination engineering, 2012, 23(5): 4-17.).
Therefore, light not only satisfies the visual needs of human but also is the most important circadian rhythm regulator. The visual effect of the light source is represented by the color coordinate point (x, y), but the color coordinate point is not very intuitive. The Lighting industry generally uses Correlated Color Temperature (CCT) to represent the Color of light sources, but Color temperature can only express one-dimensional characteristics of Color coordinates, and even if the Color temperatures of light sources are the same, the Color of light they emit is not exactly the same, and the Color quality of light is also related to the distance (Duv) from the point of the Color coordinates to the black body curve, see Rea M, freesiiier j.white Lighting for identification applications [ J ] Lighting Research & Technology,2013,45:331 344 (white Lighting for home environment applications, journal of Lighting Research and Technology) and Rea M, freesiiier j.white Lighting [ J ] Color Research and Application,2013,38(2):82-92 (white Lighting, Color Research and Application). The distance from the color coordinate point to the black body curve and the color temperature are used simultaneously, so that the light color quality of the white light can be represented more accurately. On the other hand, the mechanism of action of light on the rhythm and vision systems is not the same. Some of the foreign studies are currently using circadian rhythm action factors (CAFs) (see Oh J H, Yang S J, Do Y R. health, natural, effective and reliable lighting: four-package white LEDs for optimizing the circadian rhythm effect, color quality and visual performance. J. Light: Science & Applications,2014,3: e141. (healthy natural, highly tunable lighting: four-primary white LEDs that optimize the rhythm effect, color quality and visual performance; Light: Science and application journal) and Zukushkaskas A, Vakauskas R. Science and application journal. J. Light of the circadian rhythm action of the physiological rhythm effect-spectrum source J. Light: 35J. for modulating the circadian rhythm action factor (CAF) (see the physiological rhythm action factor J. application J. sub. J. sub. Light, III. sub. Light: 2. sub. Light), cosmetic spectral images of the biological properties of the tissues of the human eye, and the steady visibility [ J ]. PLoS One,2013,8(7): e67798. (evaluation of the effect of different artificial light source spectra on melatonin suppression, photosynthesis and star visibility, [ public science library-complex ] Journal) and Sano I, Tanito M, Okuno T, et al.evaluation of the effects of the various artificial light source spectra on melatonin suppression, photosynthesis and star visibility. J ]. Japanese patent Journal of opthalmology, 2014,58:320 [ see lens and yellow-colored intraocular lenses ] ophthalmic biodata, indicating the effect of the physiological rhythm on melanin suppression, Japanese Journal of the ocular rhythm). When the rhythm effect efficiency or melatonin suppression index of the light source is higher, the rhythm effect of the light source on the human body is more obvious, the more sober the human body is, and the learning and working efficiency is correspondingly improved. Therefore, for a light source closely related to human life, the visual effect and the non-visual biological effect of the light source must be simultaneously optimized according to the practical application requirements. For example, when people work in offices in the daytime, on one hand, the indoor light environment needs to be improved, and people feel comfortable and pleasant; on the other hand, there is a need to improve the rhythm effect efficiency of the light source to enable employees to work better and more efficiently. However, there is currently little research on the quantification of the non-visual biological effects of light sources. The white light LED with two primary colors for common illumination, namely the white light LED with the mixed color of the fluorescent powder excited by the blue light chip does not consider the index performance of light health.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light health Duv adjustable white light LED design method and a lighting system thereof, which utilize mixed color design, optimize the spectrum of an LED light source by optimizing the distance from a color coordinate point to a black body curve under the condition of keeping the same color temperature and the same color rendering index, effectively improve the light color quality, the rhythm action efficiency and the melatonin suppression index, and effectively improve the learning and working efficiency of people when the white light LED lighting system is used for indoor lighting, thereby better meeting the health requirements of human bodies.
The technical scheme adopted by the invention for solving the technical problems is as follows: a design method of a healthy light Duv adjustable white light LED is characterized by comprising the following specific steps:
step 1: setting a target color temperature required by a white light LED lighting system to be designed; then, in a CIE 1931 color gamut space, a plurality of color coordinate points with different distances from a black body curve, namely different Duv values, are taken on an isochromatic temperature line of a target color temperature;
step 2: aiming at each color coordinate point with different Duv values on an equal color temperature line of a target color temperature, solving the emission spectrum energy proportion of a three-primary-color red light LED, a green light LED and a blue light LED which meet the color coordinate point and a white light LED converted by fluorescent powder with any color temperature by using a singular value equation, wherein each color coordinate point corresponds to a plurality of different emission spectrum energy proportions; then, mixing colors of the three primary colors red light LED, the green light LED and the blue light LED which meet the color coordinate point and the white light LED converted by the fluorescent powder with any color temperature according to each emission spectrum energy ratio corresponding to each color coordinate point to obtain a white light source under each emission spectrum energy ratio corresponding to the color coordinate point; the wavelengths of the red light LED, the green light LED, the blue light LED and the white light LED converted by the fluorescent powder with any color temperature are different;
and step 3: calculating the rhythm effect efficiency, melatonin suppression index and color rendering index of the white light source under each emission spectrum energy proportion corresponding to each color coordinate point with different Duv values on the isochromatic temperature line of the target color temperature, and correspondingly marking the rhythm effect efficiency, melatonin suppression index and color rendering index of the white light source under any emission spectrum energy proportion corresponding to any color coordinate point as gammaC,vMSI and XS;
and 4, step 4: obtaining curve relations among the Duv value, the emission spectrum energy ratio, the rhythm effect efficiency, the melatonin suppression index and the color rendering index according to the corresponding Duv values of all color coordinate points with different Duv values on the isochromatic temperature line of the target color temperature, the corresponding emission spectrum energy ratio, and the rhythm effect efficiency, the melatonin suppression index and the color rendering index of the white light source under the corresponding emission spectrum energy ratio; then obtaining the optimized emission spectrum energy proportion corresponding to each Duv value when the target color temperature and the designated color rendering index have high rhythm action efficiency according to the curve relation among the Duv value, the emission spectrum energy proportion, the rhythm action efficiency, the melatonin suppression index and the color rendering index;
and 5: adopting pulse width modulation dimming for the three-primary-color red light LED, the green light LED and the blue light LED of each color coordinate point with different Duv values on the isochromatic temperature line meeting the target color temperature and the white light LED converted by the fluorescent powder with any color temperature, and changing the respective light output intensity to enable the emission spectrum energy ratio to reach the corresponding optimized emission spectrum energy ratio obtained in the step 4; and then performing color mixing design according to the dimmed red light LED, green light LED, blue light LED and white light LED of each color coordinate point, and designing to obtain a white light LED illumination system with healthy light, wherein the white light LED illumination system has high rhythm action efficiency and high melatonin suppression index under the target color temperature and the designated color rendering index.
In the step 3, the step of processing the image,
wherein, γC,vIs in the unit of W/klm, λ is a wavelength variable, Φ (λ) represents a spectral energy distribution function of the white light source at the emission spectral energy ratio, C (λ) represents a spectral optical efficiency curve of the rhythmic effect of the white light source at the emission spectral energy ratio, V (λ) represents a spectral optical efficiency function of photopic vision of the white light source at the emission spectral energy ratio, K (λ) represents a spectral optical efficiency function of photopic vision of the white light source at the emission spectral energy ratio, andma maximum value of spectral optical efficiency of photopic vision of the white light source at the emission spectral energy ratio, M (λ) represents a melatonin suppressing spectral optical efficiency curve of the white light source at the emission spectral energy ratio, Φn(lambda) represents the normalized spectral energy distribution obtained by normalizing phi (lambda),
Φn(D65)(λ) represents the spectral power distribution Φ of the D65 light sourceD65(lambda) normalized spectral energy distribution obtained after normalization processing.
The white light LED lighting system designed by the light health Duv adjustable white light LED design method is characterized in that the white light LED lighting system is formed by mixing three primary color red light LEDs, green light LEDs and blue light LEDs with different wavelengths and fluorescent powder conversion white light LEDs with any color temperature according to the optimized emission spectral energy ratio corresponding to each Duv value when the target color temperature and the appointed color rendering index have high rhythm effect efficiency, and the white light LED lighting system has high rhythm effect efficiency and high melatonin suppression index at the target color temperature and the appointed color rendering index.
The adjusting range of the target color temperature is 2000-10000K.
The value range of the Duv value is [ -0.1,0 ].
Compared with the prior art, the invention has the advantages that:
1) according to the invention, through color mixing of the white light LED, the red light LED, the green light LED and the blue light LED, and according to the emission spectrum energy ratio, the color rendering index, the rhythm effect efficiency, the melatonin suppression index and the curve relation among the Duv values of the white light LED, the red light LED, the green light LED and the blue light LED, the optimized emission spectrum energy ratio under the target color temperature and the appointed color rendering index at different Duv values is obtained, and the high rhythm effect efficiency and the high melatonin suppression index light healthy white light LED illumination system at different Duv values can be obtained by utilizing the optimized emission spectrum energy ratio at different Duv values.
2) The invention uses a singular value equation to solve the emission spectrum energy proportion of the three primary colors red light LED, green light LED and blue light LED which meet the color coordinate points corresponding to different Duv values (namely each color coordinate point taken on the isochromatic temperature line of the target color temperature) and the white light LED converted by fluorescent powder of any color temperature, and then calculates the three parameters of the rhythm action efficiency, the melatonin suppression index and the color rendering index of the white light source under each emission spectrum energy proportion, wherein the rhythm action efficiency and the melatonin suppression index are used for quantitatively representing the influence of light on the physiological rhythm and health of a human body, the calculation process is simple and practical, and the actual product can be accurately designed according to the calculation result.
3) Compared with the common white light LED with two primary colors, the white light LED lighting system with different Duv values designed by the invention has the rhythm effect efficiency improved by more than 20%.
Drawings
FIG. 1 is a schematic diagram of 5 color coordinate points with different distances to a black body curve on an isochromatic line of a target color temperature in a CIE 1931 color gamut space;
FIG. 2 is a schematic diagram of the relative spectral power distributions of selected red, green, blue and white LEDs;
FIG. 3 is a graph showing the relationship between the Duv value, the ratio of the emitted spectral energy and the rhythm effect efficiency when the Duv value given in FIG. 1 and the white LED, the red LED, the green LED and the blue LED given in FIG. 2 are mixed into a white light source;
FIG. 4 is a graph showing the relationship among the Duv value, the emission spectrum energy ratio and the melatonin suppression index when the Duv value shown in FIG. 1 and the white LED, the red LED, the green LED and the blue LED shown in FIG. 2 are mixed to form a white light source;
FIG. 5 is a schematic diagram showing the relationship among the Duv values, the emission spectrum energy ratios, the color rendering indexes, and the rhythm action efficiencies when the Duv values given in FIG. 1 and the white LED, the red LED, the green LED, and the blue LED given in FIG. 2 are mixed into a white light source;
fig. 6 is a graph showing the relative spectral power distribution at different Duv values for a light-healthy white LED lighting system designed using the method of the present invention with a target color temperature of 4000K and a Color Rendering Index (CRI) of 80 having a high rhythmic action efficiency and a high melatonin suppression index.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows:
in the design method for the white light LED with adjustable Duv and healthy light provided by the embodiment, a white light LED lighting system with high rhythm effect efficiency at a target color temperature is designed according to the distance (Duv) from a color coordinate point in a CIE 1931 color gamut space to a black body curve; the method for designing the white light LED comprises the following specific steps:
step 1: setting a target color temperature required by a white light LED lighting system to be designed; then, in a CIE 1931 color gamut space, a plurality of color coordinate points with different distances from a black body curve, namely different Duv values, are taken on an isochromatic temperature line of a target color temperature; that is, the distances from all the color coordinate points to the black body curve, i.e., the Duv value, are different.
Here, it is also allowable to arbitrarily take 1 color coordinate point on the isochromatic curve of the target color temperature, and in this embodiment, 5 color coordinate points are arbitrarily taken, and in the indoor lighting application, it is generally required that the absolute value of Duv value corresponding to the taken color coordinate point is less than or equal to 0.005. Fig. 1 shows a schematic diagram of 5 color coordinate points with different distances to a black body curve taken on an equal color temperature line of a target color temperature in a CIE 1931 color gamut space, where the respective distances from the 5 color coordinate points to the black body curve are 0, -0.005, -0.01, -0.015, -0.02, where a color coordinate point with a distance to the black body curve of 0 is a standard color coordinate point of the target color temperature, a color coordinate point with a negative distance to the black body curve is below the black body curve, and the larger the absolute value of the distance to the black body curve is, the farther the distance from the color coordinate point corresponding to the distance to the black body curve is.
Step 2: aiming at each color coordinate point with different Duv values on an equal color temperature line of a target color temperature, solving the emission spectrum energy proportion of a three-primary-color red light LED, a green light LED and a blue light LED which meet the color coordinate point and a white light LED converted by fluorescent powder with any color temperature by using a singular value equation, wherein each color coordinate point corresponds to a plurality of different emission spectrum energy proportions; then, mixing colors of the three primary colors red light LED, the green light LED and the blue light LED which meet the color coordinate point and the white light LED converted by the fluorescent powder with any color temperature according to each emission spectrum energy ratio corresponding to each color coordinate point to obtain a white light source under each emission spectrum energy ratio corresponding to the color coordinate point; the wavelengths of the red light LED, the green light LED, the blue light LED and the white light LED converted by the fluorescent powder with any color temperature are different.
Here, assuming that the target color temperature required by the white LED lighting system to be designed is 4000K, the three primary colors red LED, green LED, and blue LED satisfying the color coordinate point and the phosphor-converted white LED of any color temperature may be mixed into the white LED lighting system of 4000K color temperature, for example, the phosphor-converted white LED of 2700K or 4000K or 6500K color temperature may be mixed with the red LED, the green LED, and the blue LED.
In this embodiment, red LEDs with a peak wavelength of 634nm and a full-width half maximum of 18nm, green LEDs with a peak wavelength of 521nm and a full-width half maximum of 33nm, blue LEDs with a peak wavelength of 465nm and a full-width half maximum of 25nm, and phosphor-converted white LEDs with a color temperature of 4000K are selected, and fig. 2 shows the relative spectral power distribution of the selected red LEDs, green LEDs, blue LEDs, and white LEDs. When four LED light sources with different wavelengths are used for color mixing, the emission spectrum energy ratios corresponding to all the color coordinate points can be mixed into a white light source with a target color temperature, and the Duv values of the white light sources are respectively 5, namely 0, -0.005, -0.01, -0.015 and-0.02.
And step 3: calculating rhythm action efficiency, melatonin suppression index and color rendering index of the white light source under each emission spectrum energy proportion corresponding to each color coordinate point with different Duv values on the isochromatic temperature line of the target color temperature, wherein the two parameters of the rhythm action efficiency and the melatonin suppression index are used for quantitatively representing the influence of light on the physiological rhythm and health of a human body, and correspondingly marking the rhythm action efficiency, the melatonin suppression index and the color rendering index of the white light source under any emission spectrum energy proportion corresponding to any color coordinate point as gammaC,vMSI and XS; the way in which the color rendering index of a white light source is calculated is known from colorimetry.
ΥC,vRepresents the non-visual biological effect content in the spectrum of the white light source under the emission spectrum energy, which is equal to the rhythm effect weighted radiant power in each thousand lumens luminous flux, and the parameter can be used for quantitatively analyzing the rhythm effect efficiency of different white light sources; y at the same luminous fluxC,vThe larger the value of (A), the more significant the rhythm effect of the corresponding white light source on the human body is. The larger the value of MSI, the more awake a person is.
In this particular embodiment, in step 3,
wherein, γC,vThe unit of (A) is W/klm, λ is a wavelength variable, Φ (λ) represents a spectral energy distribution function of the white light source under the emission spectral energy proportion, Φ (λ) represents the relative luminous intensity of the white light source under the emission spectral energy proportion at different wavelengths λ, C (λ) represents a spectral light efficiency curve of the rhythm effect of the white light source under the emission spectral energy proportion, and V (λ) represents a spectral light efficiency function of photopic vision of the white light source under the emission spectral energy proportion, namely a photopic vision function, which represents the human eye to different wavelengthsRelative sensitivity of λ, KmA maximum value, K, of the spectral light efficiency of the white light source representing photopic vision at the emission spectral energy ratiomRepresents the maximum value of the visual effect of human eyes on different wavelength spectrums, is an important coefficient in radiometric and photometric conversion, and K is the maximum value in the embodimentm683lm/W, M (λ) represents the spectral optical efficiency curve of melatonin suppression for white light sources at this spectral energy fraction of emission, Φn(lambda) represents the normalized spectral energy distribution obtained by normalizing phi (lambda),
Φn(D65)(λ) represents the spectral power distribution Φ of the D65 light sourceD65(lambda) normalized spectral energy distribution, where in radiometry, integral of phi (lambda) over wavelength ^ phi (lambda) d lambda is used to obtain radiation flux of light source, which represents the physical characteristics of light source itself, and in the field of illumination, the light source is mainly sensed by human vision, so it is necessary to consider the response of human eye to different wavelengths of light, so photometric parameters are usually used to evaluate the illumination light source, where the light flux is Km∫Φ(λ)V(λ)dλ，KmV (λ) is called spectral luminous efficiency, and is the visual efficiency of human eyes to light radiation with different wavelengths.
And 4, step 4: obtaining curve relations among the Duv value, the emission spectrum energy ratio, the rhythm effect efficiency, the melatonin suppression index and the color rendering index according to the corresponding Duv values of all color coordinate points with different Duv values on the isochromatic temperature line of the target color temperature, the corresponding emission spectrum energy ratio, and the rhythm effect efficiency, the melatonin suppression index and the color rendering index of the white light source under the corresponding emission spectrum energy ratio; and then obtaining the optimized emission spectrum energy ratio corresponding to each Duv value when the target color temperature and the designated color rendering index have high rhythm action efficiency according to the curve relation among the Duv value, the emission spectrum energy ratio, the rhythm action efficiency, the melatonin suppression index and the color rendering index.
FIG. 3 shows a curve relationship between Duv values, emission spectrum energy ratios and rhythm action efficiency when the Duv values given in FIG. 1 and the white, red, green and blue LEDs given in FIG. 2 are mixed to form a white light source; fig. 4 shows the relationship between Duv values, emission spectral energy ratios and melatonin suppression indices when mixing the Duv values given in fig. 1 and the white, red, green and blue LEDs given in fig. 2 into a white light source. As can be seen from fig. 3 and 4, as the emission spectrum energy ratio increases, both the rhythm effect efficiency and the melatonin suppression index increase linearly; as the absolute value of the Duv value increases, the rhythm-action efficiency and the melatonin suppression index also increase accordingly.
FIG. 5 shows the curve relationship between the Duv value, the emission spectrum energy ratio, the color rendering index, and the rhythm action efficiency when the Duv value shown in FIG. 1 and the white LED, the red LED, the green LED, and the blue LED shown in FIG. 2 are mixed to form a white light source.
In fig. 3,4 and 5, the RGB ratio is the sum of the emission spectrum energy ratios of the three monochromatic lights, and the white light ratio is 1-RGB ratio. Fig. 3 and 4 mainly illustrate the influence of the sum of the RGB emission spectrum energy ratios on the rhythm control efficiency and the melatonin suppression index, respectively.
And 5: adopting pulse width modulation dimming for the three-primary-color red light LED, the green light LED and the blue light LED of each color coordinate point with different Duv values on the isochromatic temperature line meeting the target color temperature and the white light LED converted by the fluorescent powder with any color temperature, and changing the respective light output intensity to enable the emission spectrum energy ratio to reach the corresponding optimized emission spectrum energy ratio obtained in the step 4; and then performing color mixing design according to the dimmed red light LED, green light LED, blue light LED and white light LED of each color coordinate point, and designing to obtain a white light LED illumination system with healthy light, wherein the white light LED illumination system has high rhythm action efficiency and high melatonin suppression index under the target color temperature and the designated color rendering index.
To further illustrate the effectiveness of the method of the present invention, the method of the present invention was tested.
The LED is a red LED with a peak wavelength of 634nm and a full-width half-maximum of 18nm, a green LED with a peak wavelength of 521nm and a full-width half-maximum of 33nm, a blue LED with a peak wavelength of 465nm and a full-width half-maximum of 25nm, and a phosphor-converted white LED with a color temperature of 4000K.
The method is utilized to design the light healthy white light LED lighting system with the Duv values of 0, -0.005, -0.01, -0.015 and-0.02, the target color temperature of 4000K and the Color Rendering Index (CRI) of 80 and high rhythm effect efficiency and high melatonin suppression index. Table 1 lists the parameters of photo-biological effect at different Duv values and the optimized emission spectral energy ratios of the red LED, the green LED, the blue LED and the white LED, and the related parameters of the pure white LED for the white LED lighting system.
TABLE 1 parameters of photo-biological effect at different Duv values for a white LED lighting system with a target color temperature of 4000K and a Color Rendering Index (CRI) of 80, and optimized ratios of emitted spectral energies of the corresponding red, green, blue and white LEDs, and related parameters for pure white LEDs
Fig. 6 shows the relative spectral power distribution of a photo-healthy white LED lighting system with a high rhythm effect efficiency and a high melatonin suppression index for different Duv values for a color temperature of 4000K and a Color Rendering Index (CRI) of 80 in the above table.
Example two:
the embodiment provides a white light LED lighting system designed by the light health Duv adjustable white light LED design method, which is formed by mixing the three primary colors red light LEDs, green light LEDs and blue light LEDs with different wavelengths and the white light LEDs converted by fluorescent powder with any color temperature according to the optimized emission spectral energy ratio corresponding to each Duv value when the target color temperature and the designated color rendering index have high rhythm effect efficiency, and the white light LED lighting system has high rhythm effect efficiency and high melatonin suppression index at the target color temperature and the designated color rendering index.
In the embodiment, the adjustment range of the target color temperature is 2000-10000K, for example, the target color temperature is 4000K.
In this embodiment, the value of Duv is in the range of [ -0.1,0], such as 0, -0.005, -0.01, -0.015, -0.02.
Claims (5)
1. A design method of a healthy light Duv adjustable white light LED is characterized by comprising the following specific steps:
step 1: setting a target color temperature required by a white light LED lighting system to be designed; then, in a CIE 1931 color gamut space, a plurality of color coordinate points with different distances from a black body curve, namely different Duv values, are taken on an isochromatic temperature line of a target color temperature;
step 2: aiming at each color coordinate point with different Duv values on an equal color temperature line of a target color temperature, solving the emission spectrum energy proportion of a three-primary-color red light LED, a green light LED and a blue light LED which meet the color coordinate point and a white light LED converted by fluorescent powder with any color temperature by using a singular value equation, wherein each color coordinate point corresponds to a plurality of different emission spectrum energy proportions; then, mixing colors of the three primary colors red light LED, the green light LED and the blue light LED which meet the color coordinate point and the white light LED converted by the fluorescent powder with any color temperature according to each emission spectrum energy ratio corresponding to each color coordinate point to obtain a white light source under each emission spectrum energy ratio corresponding to the color coordinate point; the wavelengths of the red light LED, the green light LED, the blue light LED and the white light LED converted by the fluorescent powder with any color temperature are different;
and step 3: calculating the rhythm effect efficiency, melatonin suppression index and color rendering index of the white light source under each emission spectrum energy proportion corresponding to each color coordinate point with different Duv values on the isochromatic temperature line of the target color temperature, and correspondingly marking the rhythm effect efficiency, melatonin suppression index and color rendering index of the white light source under any emission spectrum energy proportion corresponding to any color coordinate point as gammaC,vMSI and XS;
and 4, step 4: obtaining curve relations among the Duv value, the emission spectrum energy ratio, the rhythm effect efficiency, the melatonin suppression index and the color rendering index according to the corresponding Duv values of all color coordinate points with different Duv values on the isochromatic temperature line of the target color temperature, the corresponding emission spectrum energy ratio, and the rhythm effect efficiency, the melatonin suppression index and the color rendering index of the white light source under the corresponding emission spectrum energy ratio; then obtaining the optimized emission spectrum energy proportion corresponding to each Duv value when the target color temperature and the designated color rendering index have high rhythm action efficiency according to the curve relation among the Duv value, the emission spectrum energy proportion, the rhythm action efficiency, the melatonin suppression index and the color rendering index;
and 5: adopting pulse width modulation dimming for the three-primary-color red light LED, the green light LED and the blue light LED of each color coordinate point with different Duv values on the isochromatic temperature line meeting the target color temperature and the white light LED converted by the fluorescent powder with any color temperature, and changing the respective light output intensity to enable the emission spectrum energy ratio to reach the corresponding optimized emission spectrum energy ratio obtained in the step 4; and then performing color mixing design according to the dimmed red light LED, green light LED, blue light LED and white light LED of each color coordinate point, and designing to obtain a white light LED illumination system with healthy light, wherein the white light LED illumination system has high rhythm action efficiency and high melatonin suppression index under the target color temperature and the designated color rendering index.
2. The method of claim 1, wherein in step 3,
wherein, γC,vIs in the unit of W/klm, λ is a wavelength variable, Φ (λ) represents a spectral energy distribution function of the white light source at the emission spectral energy ratio, C (λ) represents a spectral optical efficiency curve of the rhythmic effect of the white light source at the emission spectral energy ratio, V (λ) represents a spectral optical efficiency function of photopic vision of the white light source at the emission spectral energy ratio, K (λ) represents a spectral optical efficiency function of photopic vision of the white light source at the emission spectral energy ratio, andma maximum value of spectral optical efficiency of photopic vision of the white light source at the emission spectral energy ratio, M (λ) represents a melatonin suppressing spectral optical efficiency curve of the white light source at the emission spectral energy ratio, Φn(lambda) represents the normalized spectral energy distribution obtained by normalizing phi (lambda),
Φn(D65)(λ) represents the spectral power distribution Φ of the D65 light sourceD65(lambda) normalized spectral energy distribution obtained after normalization processing.
3. A white light LED lighting system designed by the light health Duv adjustable white light LED design method of claim 2, characterized in that the white light LED converted by the phosphor of different wavelengths of the three primary colors red LED, green LED and blue LED and any color temperature is mixed according to the optimized emission spectrum energy ratio corresponding to each Duv value when the target color temperature and the designated color rendering index have high rhythm effect efficiency, the white light LED lighting system has high rhythm effect efficiency and high melatonin suppression index at the target color temperature and the designated color rendering index.
4. The DUV-tunable white LED light system according to claim 3, wherein the target color temperature is adjusted in the range of 2000-10000K.
5. A photo-healthy Duv tunable white LED lighting system according to claim 3 or 4, characterized in that the value of Duv is in the range of [ -0.1,0 ].
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| CN114173449A (en) * | 2021-10-18 | 2022-03-11 | 佛山电器照明股份有限公司 | Modulation method of diurnal rhythm spectrum |
| CN114173448A (en) * | 2021-10-18 | 2022-03-11 | 佛山电器照明股份有限公司 | Method for modulating night rhythm spectrum |
| CN114501722A (en) * | 2022-01-06 | 2022-05-13 | 佛山电器照明股份有限公司 | Modulation method of rhythm spectrum |
| CN114630463A (en) * | 2022-03-21 | 2022-06-14 | 广州光联电子科技有限公司 | LED light source dimming method and dimming system |
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| CN118380423A (en) * | 2024-05-24 | 2024-07-23 | 东莞市立德达光电科技有限公司 | Rest state biological light spectrum LED light source and preparation method thereof |
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| CN114173449A (en) * | 2021-10-18 | 2022-03-11 | 佛山电器照明股份有限公司 | Modulation method of diurnal rhythm spectrum |
| CN114173448A (en) * | 2021-10-18 | 2022-03-11 | 佛山电器照明股份有限公司 | Method for modulating night rhythm spectrum |
| CN114501722A (en) * | 2022-01-06 | 2022-05-13 | 佛山电器照明股份有限公司 | Modulation method of rhythm spectrum |
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| CN116229884B (en) * | 2023-02-17 | 2024-05-10 | 荣耀终端有限公司 | Screen display method and related electronic equipment |
| CN118380423A (en) * | 2024-05-24 | 2024-07-23 | 东莞市立德达光电科技有限公司 | Rest state biological light spectrum LED light source and preparation method thereof |
| CN118380423B (en) * | 2024-05-24 | 2024-10-01 | 东莞市立德达光电科技有限公司 | Rest state biological light spectrum LED light source and preparation method thereof |
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