Spectrum modulation method and system for multi-color-temperature rhythm lighting device

Abstract

The invention relates to the field of lighting lamps, in particular to a spectrum modulation method and system of a multi-color-temperature rhythm lighting device. According to the method, the spectral curve formed by the light source emitted by the lighting device is obtained, the at least two color temperature nodes are selected from the spectral curve, and after the middle node of the connecting line of the two color temperature nodes is determined, the middle node is optimized according to the preset target light mixing color temperature node to obtain the middle light mixing color temperature node; calculating a difference spectrum according to the spectrum of the target mixed light color temperature node and the spectrum of the middle mixed light color temperature node, determining a combined spectrum according to the difference spectrum, and finally modulating a spectrum curve through the combined spectrum to obtain a full spectrum curve. According to the scheme, the spectrum formed by the mixed light source emitted by the lighting device is optimized to be close to the spectrum of the target color temperature node, meanwhile, the mixed color point can keep the full-spectrum characteristic, and rhythm full-spectrum lighting in a wide color temperature range is achieved.

Description

Technical Field

[0001] The present invention relates to the field of lighting fixtures, and in particular to a spectrum modulation method and system for a multi-color temperature rhythmic lighting device. Background Art

[0002] The full-spectrum concept is a promising branch of LED lighting. The idea is that the closer the emission spectrum is to natural light, the better the lighting effect on human health. The circadian concept is a new and important branch of healthy lighting. Its concept is that color temperature changes with different application scenarios to adapt to the human body's physiological rhythms.

[0003] The lighting rhythm system currently on the market does not focus on indicators such as the color rendering and spectral continuity of the synthetic spectrum. Let us take the more mainstream full-spectrum devices on the market as an example and list the 2700K-6500K dual color temperature adjustment solution, such as Figure 1 It is a spectrum diagram of 2700K, 6500K and synthetic color temperature 4000K, and its parameters are listed as follows Figure 2 From the table, it can be seen that the Ra and R9 of the synthetic color temperature of 4000K are relatively worse (parameters such as Ra and R9 are the CIE (International Commission on Illumination)'s evaluation system for color rendering).

[0004] In addition, the common high-definition image quality ignores the continuity of the spectrum and the similarity with the natural light spectrum. We introduce the IES (Illuminating Engineering Society of North America) TM-30-15 standard evaluation system to evaluate the three typical spectra mentioned above. Figure 3 Compared with the spectrum of background reference natural light, the continuity of the mixed spectrum is significantly poorer, affecting the application effect. In addition, the blue light peak of the mixed spectrum is relatively poor, which in turn leads to a weakened regulatory effect on physiological rhythms. Summary of the Invention

[0005] The present invention provides a spectrum modulation method and system for a multi-color temperature rhythmic lighting device, which effectively solves the problems of poor continuity of mixed spectra and poor blue light peak value emitted by existing lighting devices.

[0006] According to the first aspect, an embodiment provides a spectrum modulation method for a multi-color temperature rhythmic lighting device, comprising: Obtaining a spectral curve formed by a light source of the lighting device, wherein the light source includes light sources of at least two color temperatures; At least two color temperature nodes are selected from the spectrum curve, wherein the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on the daylight trajectory; Determining an intermediate node according to a line connecting the upper limit color temperature node and the lower limit color temperature node; Optimizing the intermediate node according to a preset target mixed light color temperature node to obtain an intermediate mixed light color temperature node; Calculating a difference spectrum based on the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node; determining a combined spectrum based on the difference spectrum; The spectrum curve is modulated by the combined spectrum to obtain a full spectrum curve.

[0007] In an achievable implementation, determining the intermediate node according to a connection between the upper limit color temperature node and the lower limit color temperature node includes: Determining the color coordinates of the upper limit color temperature node and the color coordinates of the lower limit color temperature node; Determining the color temperature value of the intermediate node according to the color temperature value of the upper limit color temperature node and the color temperature value of the lower limit color temperature node; The color coordinates of the intermediate node are calculated according to the color temperature value of the upper limit color temperature node, the color temperature value of the lower limit color temperature node, the color temperature value of the intermediate node, the color coordinates of the upper limit color temperature node, and the color coordinates of the lower limit color temperature node.

[0008] In an achievable embodiment, the optimizing the intermediate node according to the preset target light mixing color temperature node to obtain the intermediate light mixing color temperature node includes: Adjusting the positions of the upper limit color temperature node and the lower limit color temperature node so that the position of the intermediate node is within a preset color tolerance range of the position of the target mixed light color temperature node; Determining the color coordinates of the adjusted upper limit color temperature node and the color coordinates of the adjusted lower limit color temperature node; The color coordinates of the intermediate mixed light color temperature node are determined according to the adjusted color coordinates of the upper limit color temperature node and the adjusted color coordinates of the lower limit color temperature node.

[0009] In an achievable implementation, the calculating a difference spectrum based on the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node includes: The difference between the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node is calculated to obtain the difference spectrum.

[0010] In one feasible embodiment, determining a combined spectrum according to the spectral difference includes: determining a theoretical spectral model based on the spectral difference; According to the spectral form of the theoretical spectral model, a corresponding combined spectrum is determined; the combined spectrum is formed by mixing a plurality of lights of different colors.

[0011] In an achievable embodiment, the modulating the spectrum curve by the combined spectrum to obtain a full spectrum curve includes: Determining the mixing ratio of light of different colors in each color temperature node according to the adjusted spectrum of the color temperature node and the combined spectrum; The spectrum corresponding to each color temperature node is modulated according to the mixing ratio of light of different colors in each color temperature node to obtain a full spectrum curve.

[0012] In an achievable implementation, determining the mixing ratio of each color of light in each color temperature node based on the adjusted spectrum of the upper limit color temperature node, the adjusted spectrum of the lower limit color temperature node, and the combined spectrum includes: Establishing a relationship between the spectrum of each adjusted color temperature node and the combined spectrum; The relationship is calculated using an interpolation method to obtain the mixing ratio of light of different colors in each color temperature node.

[0013] In an achievable implementation, the relationship is calculated by interpolation to obtain the mixing ratio of light of different colors in each color temperature node, including: Constructing a finite array of proportional coefficients for each color light in all combined spectra using an interpolation method, and selecting a group of arrays with the smallest average spectrum difference for each color light in the finite array as the proportional coefficient array for the current color light; The mixing ratio of different colors of light in each color temperature node is determined according to the selected proportional coefficient array of each color light.

[0014] According to the second aspect, an embodiment provides a spectrum modulation system for a multi-color temperature rhythmic lighting device, comprising: A spectrum curve acquisition module, configured to acquire a spectrum curve formed by a light source of a full-spectrum device, wherein the light source includes light sources of at least two color temperatures; a color temperature node selection module, configured to select at least two color temperature nodes from the spectrum curve, wherein the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on a daylight trajectory; an intermediate node determination module, configured to determine an intermediate node according to a connection between the upper limit color temperature node and the lower limit color temperature node; An optimization module, configured to optimize the intermediate node according to a preset target mixed light color temperature node to obtain an intermediate mixed light color temperature node; a difference spectrum determination module, configured to calculate a difference spectrum based on the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node; a combined spectrum determining module, configured to determine a combined spectrum based on the difference spectrum; The modulation module is used to modulate the spectrum curve through the combined spectrum to obtain a full spectrum curve.

[0015] According to a third aspect, an embodiment provides a computer-readable storage medium, on which a computer program is stored. The computer program can be executed by a processor to implement the method described above.

[0016] According to the above-mentioned embodiment, a spectrum modulation method and system for a multi-color temperature rhythmic lighting device is provided. By obtaining a spectrum curve formed by the light source emitted by the lighting device, at least two color temperature nodes are selected from the spectrum curve, an intermediate node connecting the two color temperature nodes is determined, and then the intermediate node is optimized according to a preset target mixed light color temperature node to obtain an intermediate mixed light color temperature node. A difference spectrum is then calculated based on the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node. A combined spectrum is determined based on the difference spectrum, and finally, the spectrum curve is modulated using the combined spectrum to obtain a full spectrum curve. By adopting the above-mentioned scheme of the present application, the spectrum formed by the mixed light source emitted by the lighting device can be optimized to a spectrum close to the target color temperature node, while at the same time, the mixed color point can maintain the characteristics of the full spectrum, thereby achieving rhythmic full-spectrum lighting within a wide color temperature range and greatly simplifying the complexity of a rhythmic lighting control system with a quasi-full-spectrum effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The spectra of existing lighting devices are 2700K, synthetic 4000K, and 6500K respectively; Figure 2 for Figure 1 Parameter table corresponding to the spectrum; Figure 3 for Figure 1 Comparison chart of three spectra and the spectrum of IES (Illuminating Engineering Society of North America) TM-30-15 standard evaluation system; Figure 4 is a flow chart of the spectrum modulation method of this embodiment; Figure 5 The color coordinate diagram for determining the intermediate nodes of this embodiment; Figure 6 This is a flowchart of determining an intermediate node in this embodiment; Figure 7 This is a flow chart of obtaining the intermediate mixed light color temperature node of this embodiment; Figure 8 Spectra of the lighting device of this embodiment at 2100K, synthetic 4000K, and 6500K are compared with the spectrum of the IESTM-30-15 standard evaluation system; Figure 9A comparison diagram of the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node in this embodiment; Figure 10 Spectra comparison diagram of the 2100K, synthesized 4000K, and 6500K spectra after modulation in this embodiment and the IESTM-30-15 standard evaluation system; Figure 11 Spectra of the lighting device of this embodiment are compared with the spectra of synthesized 3000K, synthesized 4000K, synthesized 5000K, and synthesized 5700K and the spectrum of the IESTM-30-15 standard evaluation system; Figure 12 is a structural block diagram of the spectrum modulation system of this embodiment; Reference numerals: 10, spectrum curve acquisition module; 20, color temperature node selection module; 30, intermediate node determination module; 40, optimization module; 50, difference spectrum determination module; 60, combined spectrum determination module; 70, modulation module. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0019] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0020] Component numbers used herein, such as "first" and "second," are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0021] To discuss the continuity issue, we introduce the concept of ASD (Average Spectral Difference). ASD represents the ratio of the spectral difference area between the measured light source and the standard light source to the spectral area of ​​the standard light source. It is an indicator of spectral continuity. The smaller the better, and the minimum value is 0. The calculation formula of ASD is: ; Where A(λ) is the target spectrum and S(λ) is the natural light spectrum. Assuming λ1 = 400nm and λ2 = 700nm, the ASD value for each color temperature can be calculated using the above formula.

[0022] refer to Figure 4 This embodiment provides a spectrum modulation method for a multi-color temperature rhythmic lighting device, which specifically includes the following steps: Step 100: obtaining a spectrum curve formed by a light source of a lighting device through a spectrum curve obtaining module, where the light source includes light sources of at least two color temperatures.

[0023] Basic concepts in colorimetry indicate that the mixing node between two color points of equal energy density lies in the middle of the connecting line. However, the blackbody locus or daylight locus is a curve with nonlinear curvature, so the mixing color point will not coincide with the target monochromatic color point. Therefore, the positions of the color temperature nodes at both ends need to be optimized to bring the mixing color temperature node closer to the target monochromatic color point. According to the International Commission on Illumination (CIE), the daylight locus is based on the measured spectral distribution of daylight. It covers the spectral range of 400nm-700nm, and the ratio of red, green, and blue in the visible light portion approximates that of sunlight. This locus, represented on the CIE 1931 chromaticity diagram as a curve above the blackbody locus, reflects the relative spectral power distribution of daylight at different color temperatures.

[0024] Step 200: The color temperature node selection module selects at least two color temperature nodes from the spectrum curve, where the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on the daylight trajectory.

[0025] Specifically, this embodiment is described by taking the light source emitted by the lighting device as an example, wherein the light source has two color temperatures. The CIE coordinates of the upper limit color temperature node of the dual color temperature spectrum curve are A(X a , Y a ), the CIE coordinate of the upper limit color temperature node is B(X b , Y b ), by default, the color temperature nodes A and B are located on the daylight locus (or blackbody locus). The daylight locus is the line connecting the CIE points of sunlight at different color temperatures. This application uses the CIE 1931 color space diagram for representation.

[0026] Step 300: The intermediate node determination module determines an intermediate node according to the connection between the upper limit color temperature node and the lower limit color temperature node.

[0027] refer to Figure 6 Specifically, it is achieved through the following steps: Step 310: Determine the color coordinates of the upper limit color temperature node and the color coordinates of the lower limit color temperature node; Step 320: Determine the color temperature value of the intermediate node according to the color temperature value of the upper limit color temperature node and the color temperature value of the lower limit color temperature node; Step 330: Calculate the color coordinates of the middle node according to the color temperature value of the upper color temperature node, the color temperature value of the lower color temperature node, the color temperature value of the middle node, the color coordinates of the upper color temperature node, and the color coordinates of the lower color temperature node.

[0028] As mentioned above, the color coordinates of the upper limit color temperature node are determined to be A(X a , Y a ), determine the color coordinate of the lower limit color temperature node as B(X b , Y b ), find the color temperature value C of the middle node between the lines connecting the points AB on the daylight trajectory, and select the target mixed light color temperature node M(X m , Y m ). Generally, a certain range refers to the fluctuation range of CIE (X / Y) at the middle node, which can be ±0.01. Specifically, the color coordinates of the middle node are calculated as follows: ; ; Where A is the color temperature value of the upper limit color temperature node, B is the color temperature value of the lower limit color temperature node, M is the color temperature value of the middle node, (X a , Y a ) is the color coordinate of the upper limit color temperature node, (X b , Y b ) is the color coordinate of the lower limit color temperature node, (X c , Y c ) is the color coordinate of the middle node.

[0029] It should be noted that the above color coordinate calculation method has a small error when the color temperature range is small, but iterative correction is required for a large range.

[0030] Step 400: The optimization module optimizes the intermediate nodes according to the preset target mixed light color temperature node to obtain the intermediate mixed light color temperature node.

[0031] refer to Figure 7 Specifically, it is achieved through the following steps: Step 410: Adjust the positions of the upper limit color temperature node and the lower limit color temperature node so that the position of the intermediate node is within a preset color tolerance range of the position of the target mixed light color temperature node; Step 420: Determine the color coordinates of the adjusted upper limit color temperature node and the color coordinates of the adjusted lower limit color temperature node; Step 430 : Determine the color coordinates of the intermediate mixed light color temperature node according to the adjusted color coordinates of the upper limit color temperature node and the adjusted color coordinates of the lower limit color temperature node.

[0032] As described above, the position of the middle node C is adjusted by adjusting the color temperature nodes A (X a , Y a ) and B(X b , Y b ) to move the middle node C(X c , Y c ) color point position, making it closer to the target mixed light color temperature node M(X m , Y m ) ,like Figure 5 As shown. We make the adjusted intermediate nodes , which is the middle mixed light color temperature node , falls within the 4-step color tolerance range of the target mixed light color temperature node M, and the adjusted color temperature node and The optimization effect is better when the color tolerance of the color temperature node corresponding to the standard color stability point is smaller and the absolute value is closer. The color tolerance calculation method between the standard point and the non-standard center point is based on the European standard IEC60081 and is not further described in this embodiment.

[0033] For ease of understanding, this example uses the upper and lower color temperature nodes A and B as 6500K and 2700K, respectively, as an example, with 4000K (0.3788, 0.381) being the target mixed light color temperature node. The adjusted upper and lower color temperature nodes are 6450K (0.3124, 0.3395) and 2700K (0.465, 0.42), respectively. The calculated intermediate mixed light color temperature node is 4032K (0.3788, 0.375). This intermediate mixed light color temperature node is located 1.3 steps, 2.0 steps, and 2.1 steps away from the standard color points of 2700K (0.463, 0.42), 6500K (0.313, 0.337), and 4000K (0.38, 0.38), respectively. Therefore, we consider this color point to be a suitable intermediate mixed light color temperature node.

[0034] Step 500: The difference spectrum determination module calculates a difference spectrum according to the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node.

[0035] Specifically, the difference between the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node is calculated to obtain a difference spectrum.

[0036] To achieve the full-spectrum effect of rhythmic light, we introduce the parameter description specification of a full-spectrum device. The device has the following spectral characteristics and parameters: ASD < 20%, Rf > 90, Ra > 95 (the above is the average value of different color temperatures of the same device). Since the range of full-spectrum devices that meet these parameters is relatively wide, this embodiment only uses the more mainstream full-spectrum devices on the market as an example for illustration.

[0037] As mentioned above, the intermediate mixed light color temperature node C' and the target mixed light color temperature node M, by comparing the spectral difference between the two, we can clearly see the spectral defect of C'. Let the spectra of C' and M be C'(λ) and M(λ), and the difference spectrum between the two is: D MC´ =M(λ)-C´(λ), where D MC´ The range is between 380nm-780nm. In other words, D MC´ For the spectrum that needs to be supplemented.

[0038] Step 600: The combined spectrum determination module determines a combined spectrum according to the difference spectrum.

[0039] Specifically, a theoretical spectrum model is determined based on the spectrum difference; then, a corresponding combined spectrum is determined based on the spectrum morphology of the theoretical spectrum model; the combined spectrum is formed by mixing multiple lights of different colors.

[0040] In practical applications, the theoretical spectrum model is set to D MC´ ´, then its peak wavelength can be calculated based on D MC´ Roughly determined (take D MC´ The approximate value of the peak wavelength (±5nm)), its spectral shape can also be simplified to include more than 90% of the range of D MC´ The half-wave width can also be roughly determined based on the spectral model. Therefore, it can be determined that the phosphor solutions that can be realized by this theoretical spectrum are nitrogen oxide BaSi2O2N2:Eu 2+ 、Aluminate Lu3Al5O12:Ce 3+ , silicate Ba2SiO4:Eu 2+ or SiAlON:Eu 2+ 、Nitride Sr,CaAlSiN3:Eu 2+ The spectrum can also be realized in other ways, such as chip luminescence, etc. This embodiment does not make too many requirements for this.

[0041] Since the difference between the blue and red parts of the spectrum under different color temperatures is relatively small, the theoretical spectrum model can actually be evolved into a spectrum with a main wavelength between 480-600nm and a half-wave width that is feasible to implement. MC´ Spectral form of ´, D MC´ ´ can be simplified into the combined spectrum of cyan light Q(λ), green light G(λ), and orange light O(λ), and let D MC´ ´=Q(λ)+G(λ)+O(λ), as long as D MC´ ´ is determined, then Q(λ), G(λ), and O(λ) are known quantities.

[0042] Step 700: The modulation module modulates the spectrum curve by combining the spectrum to obtain a full spectrum curve.

[0043] Specifically, first, the mixing ratio of light of different colors in each color temperature node is determined according to the adjusted spectrum of the color temperature node and the combined spectrum.

[0044] In practical applications, a relationship between the spectrum of each adjusted color temperature node and the combined spectrum is established; then, the relationship is calculated using an interpolation method to obtain the mixing ratio of light of different colors in each color temperature node.

[0045] Specifically, a finite array of proportional coefficients for each color of light in all combined spectra is constructed using an interpolation method. The array with the smallest average spectral difference for each color of light in the finite array is selected as the proportional coefficient array for the current color of light. The proportion of light of different colors mixed into each color temperature node is then determined based on the selected proportional coefficient arrays for each color of light. After determining the proportion of light of different colors mixed into each color temperature node, the spectrum corresponding to that color temperature node is modulated based on the proportion of light of different colors mixed into each color temperature node to obtain the full spectrum curve.

[0046] Let the dual color temperature node spectra after combined spectrum modulation be and , let the modulated mixed light color temperature node be , then the full spectrum curve can be described as adding a part of D to A'(λ) and B'(λ) respectively. MC´ ´, the specific relationship is: ; ; in, , and n1, n2, m1, m2, p1, p2∈(0, 1).

[0047] Therefore, the proportion of the combined spectrum mixed in the above-mentioned color temperature nodes A and B can be represented by the series (n1, m1, p1) and the series (n2, m2, p2), respectively.

[0048] In practical applications, due to the addition of some D MC´ ´, the spectra of A´´(λ) and B´´(λ) will become oversaturated, and their corresponding parameters will become worse than the parameters corresponding to A´(λ) and B´(λ). Therefore, the core issue is to find the best balance point. Theoretically, in {n1+n2=1, m1+m2=1, p1+p2=1}, when the sum is 1, it is the highest value and also the best value. However, in reality, it cannot be guaranteed that the sum is 1, so the closer to 1, the better. In order to prevent the spectrum of the intermediate mixed light color temperature node from being too bad, we stipulate that {n1+n2≥0.9, m1+m2≥0.9, p1+p2≥0.9} is also an acceptable range. Using the interpolation method, let (n1, n2) be geometrically finite values, and the same applies to (m1, m2) and (p1, p2). From this, we can deduce {ASD A´´（λ） , ASD B´´（λ） , ASD C´´（λ） Taking the minimum value of the finite array yields the optimal solutions (n1, m1, p1) and (n2, m2, p2). In practical calculations, when the number of finite arrays is greater than 10, it is sufficiently accurate.

[0049] Take the color points of 2762K (0.4653, 0.4286) and 6361K (0.3141, 0.3398) after the lighting device is modulated, and the intermediate mixed light color point 4033K (0.3753, 0.3758) as an example. The effect of the spectrum of the lighting device before and after modulation can be seen by Figure 8 and Figure 10 The standard 4000K (0.3753, 0.3758) is used as the target mixed light color temperature node, and its comparison with the intermediate mixed light color point 4033K (0.3753, 0.3758) is shown in the figure below. Figure 9 According to the calculated difference spectrum, we added yellow, orange and red phosphor components to the formula of color points 2762K (0.4653, 0.4286) and 6361K (0.3141, 0.3398), and their proportions were [0%~5%, 0%~15%, 0%~10%] and [0%~5%, 0%~10%, 0%~5%] respectively, to form the theoretical D MC´ ´. Modulated spectrum combination reference Figure 10 By comparison, the spectrum of the mixed light color temperature node after modulation has been significantly improved. Table 1 below shows the color point and parameter set after modulation:

[0050] By comparing Table 1 and Figure 2 The parameters of the dual color temperature node have partially decreased, but the Ra and Rf parameters of the mixed color temperature node have been greatly improved. Therefore, after a relatively balanced spectrum modulation, the parameters of the entire mixed light system have been improved.

[0051] refer to Figure 11 , which is a comparison chart of the spectral curves of non-intermediate nodes (3000K, 5000K, 5700K) in the full spectrum curve, shows that the method of this application not only improves the intermediate node (4000K), but also improves the nodes in non-intermediate positions. The corresponding parameter table is as follows Table 2:

[0052] In addition, the spectrum modulation method of this embodiment is also applicable to the case where the light source emitted by the lighting device includes a light source with multiple color temperatures. Let the color point of multiple color temperatures be represented by {A1, B1 (A2), B2 (A3), B3 (A4), ..., B t-1 (A t ), B t}, where t is the number of color temperature points. t-1 and A t Obviously, the color points are overlapping, B t-1 (A t ) The adjusted color point can be simplified to 1 / 2 (B t-1 ´+ A t ´), similarly, 1 / 2 (B t-1 ´+ A t ´) modulated spectrum is 1 / 2 (B t-1 ´´(λ)+A t ´´(λ). The above is based on the assumption that the multi-color temperature nodes are CIE equidistant. If they are not equidistant, a weighted average calculation is required based on the CIE distance ratio of t-1 and t. We stipulate that A t-1 B t-1 and A t B t The CIE distance tables are and ,make , then B t-1 (A t )The adjusted color point should be simplified to u / (u+1)*(B t-1 ´+ A t ´), similarly, u / (u+1)*(B t-1 ´+ A t ´)The spectrum after modulation is u / (u+1)*(B t-1 ´´(λ)+A t´´(λ)).

[0053] Thus, a relatively simple and effective full-spectrum circadian lighting system has been designed. The solution of this application can achieve a near-full-spectrum effect for mixed light within any color temperature range. The parameter values ​​of the mixing node are determined by the selected full-spectrum device at the single color temperature node. For example, if the full-spectrum device parameters selected in this application are ASD < 20%, Rf > 90, and Ra > 95 (these are averaged across the same device at different color temperatures), the mixed light color point parameters can also achieve ASD < 20%, Rf > 90, and Ra > 95, demonstrating the universal applicability of this solution. Furthermore, this solution can simulate natural light transitions and full-color lighting effects, easily simulating the color temperature variations of sunlight throughout the day. Furthermore, because this solution is modified on single color temperature devices, it greatly simplifies the circadian lighting control system, enabling the adjustment of complex scenes at a low cost. This can rapidly promote the promotion and implementation of full-spectrum circadian lighting systems, making it an important system design approach for healthy lighting.

[0054] refer to Figure 12 The present embodiment provides a spectrum modulation system for a multi-color temperature rhythmic lighting device, including a spectrum curve acquisition module 10, a color temperature node selection module 20, an intermediate node determination module 30, an optimization module 40, a difference spectrum determination module 50, a combined spectrum determination module 60, and a modulation module 70. Specifically, the spectral curve acquisition module 10 is used to obtain the spectral curve formed by the light source of the full-spectrum device, and the light source includes at least two color temperature light sources; the color temperature node selection module 20 is used to select at least two color temperature nodes in the spectral curve, and the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on the daylight trajectory; the intermediate node determination module 30 is used to determine the intermediate node according to the connection between the upper limit color temperature node and the lower limit color temperature node; the optimization module 40 is used to optimize the intermediate node according to the preset target mixed light color temperature node to obtain the intermediate mixed light color temperature node; the difference spectrum determination module 50 is used to calculate the difference spectrum according to the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node; the combined spectrum determination module 60 is used to determine the combined spectrum according to the difference spectrum; the modulation module 70 is used to modulate the spectral curve through the combined spectrum to obtain a full spectrum curve.

[0055] The spectrum modulation system for a multi-color temperature rhythmic lighting device of this embodiment optimizes the spectrum formed by the mixed light source emitted by the lighting device to a spectrum close to the target color temperature node, while maintaining the characteristics of the mixed color point. This achieves rhythmic full-spectrum lighting over a wide color temperature range and greatly simplifies the complexity of a rhythmic lighting control system with a quasi-full-spectrum effect. Given that the functions and effects of the spectrum curve acquisition module 10, color temperature node selection module 20, intermediate node determination module 30, optimization module 40, difference spectrum determination module 50, combined spectrum determination module 60, and modulation module 70 have been described in detail in the above-mentioned spectrum modulation method embodiment, this embodiment does not elaborate on them in detail.

[0056] This embodiment provides a computer-readable storage medium having a computer program stored thereon. The computer program can be executed by a processor to implement the method described above. Given that the above embodiment has already detailed a spectral modulation method for a multi-color temperature rhythmic lighting device, this embodiment does not elaborate further here.

[0057] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer program. When all or part of the functions in the above embodiments are implemented by computer program, the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to implement the above functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above functions can be implemented. In addition, when all or part of the functions in the above embodiments are implemented by computer program, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash disk or mobile hard disk, and saved in the memory of the local device by downloading or copying, or the system of the local device is updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be implemented.

[0058] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A spectrum modulation method for a multi-color temperature rhythmic lighting device, characterized in that: include: Obtaining a spectral curve formed by a light source of the lighting device, wherein the light source includes light sources of at least two color temperatures; At least two color temperature nodes are selected from the spectrum curve, wherein the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on the daylight trajectory; Determining an intermediate node according to a line connecting the upper limit color temperature node and the lower limit color temperature node; Optimizing the intermediate node according to a preset target mixed light color temperature node to obtain an intermediate mixed light color temperature node; Calculating a difference spectrum based on the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node; determining a combined spectrum based on the difference spectrum; The spectrum curve is modulated by the combined spectrum to obtain a full spectrum curve.

2. The spectrum modulation method according to claim 1, wherein: The determining of the intermediate node according to the connection between the upper limit color temperature node and the lower limit color temperature node includes: Determining the color coordinates of the upper limit color temperature node and the color coordinates of the lower limit color temperature node; Determining the color temperature value of the intermediate node according to the color temperature value of the upper limit color temperature node and the color temperature value of the lower limit color temperature node; The color coordinates of the intermediate node are calculated according to the color temperature value of the upper limit color temperature node, the color temperature value of the lower limit color temperature node, the color temperature value of the intermediate node, the color coordinates of the upper limit color temperature node, and the color coordinates of the lower limit color temperature node.

3. The spectrum modulation method according to claim 1, wherein: The optimizing the intermediate node according to the preset target mixed light color temperature node to obtain the intermediate mixed light color temperature node includes: Adjusting the positions of the upper limit color temperature node and the lower limit color temperature node so that the position of the intermediate node is within a preset color tolerance range of the position of the target mixed light color temperature node; Determining the color coordinates of the adjusted upper limit color temperature node and the color coordinates of the adjusted lower limit color temperature node; The color coordinates of the intermediate mixed light color temperature node are determined according to the adjusted color coordinates of the upper limit color temperature node and the adjusted color coordinates of the lower limit color temperature node.

4. The spectrum modulation method according to claim 1, wherein: The calculating a difference spectrum according to the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node includes: The difference between the spectrum of the target light mixing color temperature node and the spectrum of the intermediate light mixing color temperature node is calculated to obtain the difference spectrum.

5. The spectrum modulation method according to claim 3, wherein: Determining a combined spectrum according to the spectral difference includes: determining a theoretical spectral model based on the spectral difference; According to the spectral form of the theoretical spectral model, a corresponding combined spectrum is determined; the combined spectrum is formed by mixing a plurality of lights of different colors.

6. The spectrum modulation method according to claim 5, wherein: The step of modulating the spectrum curve by using the combined spectrum to obtain a full spectrum curve includes: Determining the mixing ratio of light of different colors in each color temperature node according to the adjusted spectrum of the color temperature node and the combined spectrum; The spectrum corresponding to each color temperature node is modulated according to the mixing ratio of light of different colors in each color temperature node to obtain a full spectrum curve.

7. The spectrum modulation method according to claim 6, wherein: The determining the mixing ratio of each color of light in each color temperature node according to the adjusted spectrum of the upper limit color temperature node, the adjusted spectrum of the lower limit color temperature node, and the combined spectrum includes: Establishing a relationship between the spectrum of each adjusted color temperature node and the combined spectrum; The relationship is calculated using an interpolation method to obtain the mixing ratio of light of different colors in each color temperature node.

8. The spectrum modulation method according to claim 7, wherein: The interpolation method is used to calculate the relationship to obtain the mixing ratio of light of different colors in each color temperature node, including: Constructing a finite array of proportional coefficients for each color light in all combined spectra using an interpolation method, and selecting a group of arrays with the smallest average spectrum difference for each color light in the finite array as the proportional coefficient array for the current color light; The mixing ratio of different colors of light in each color temperature node is determined according to the selected proportional coefficient array of each color light.

9. A spectrum modulation system for a multi-color temperature rhythmic lighting device, characterized in that: include: A spectrum curve acquisition module, configured to acquire a spectrum curve formed by a light source of a full-spectrum device, wherein the light source includes light sources of at least two color temperatures; a color temperature node selection module, configured to select at least two color temperature nodes from the spectrum curve, wherein the at least two color temperature nodes include at least an upper limit color temperature node and a lower limit color temperature node; the upper limit color temperature node and the lower limit color temperature node are located on a daylight trajectory; an intermediate node determination module, configured to determine an intermediate node according to a connection between the upper limit color temperature node and the lower limit color temperature node; An optimization module, configured to optimize the intermediate node according to a preset target mixed light color temperature node to obtain an intermediate mixed light color temperature node; a difference spectrum determination module, configured to calculate a difference spectrum based on the spectrum of the target mixed light color temperature node and the spectrum of the intermediate mixed light color temperature node; a combined spectrum determining module, configured to determine a combined spectrum based on the difference spectrum; The modulation module is used to modulate the spectrum curve through the combined spectrum to obtain a full spectrum curve.

10. A computer-readable storage medium, characterized in that A computer program is stored on the medium, and the computer program can be executed by a processor to implement the method according to any one of claims 1 to 8.

Images