CN106604471B - Method for adjusting segmented color temperature by using multiple full-spectrum white light sources - Google Patents
Method for adjusting segmented color temperature by using multiple full-spectrum white light sources Download PDFInfo
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Abstract
The invention belongs to the technical field of semiconductor illumination, and particularly relates to a method for adjusting segmented color temperature by utilizing a plurality of full-spectrum white light sources. The target light source with high color rendering and high white light deviation at the required color temperature is obtained by selecting and mixing a plurality of full-spectrum white light sources in a segmented manner, the color temperature adjusting range is 2000-8000K, the color tolerance SDCM is less than or equal to 3 and is positioned below a black body curve in a CIE1931xy chromaticity diagram, the general color rendering index Ra is more than or equal to 95, the color rendering indexes R1-R8 are more than or equal to 90, and at least 5 special color rendering indexes R9-R15 are more than or equal to 90. The white light source obtained by the adjusting method for optimizing the color temperature range, the color tolerance and the color rendering index can be applied to illumination occasions with higher requirements on light quality.
Description
Technical Field
The invention belongs to the technical field of semiconductor illumination, and particularly relates to a full-spectrum white light source color temperature adjusting method.
Background
With the increasing living standard of human beings, the light quality of the lighting source is more and more emphasized. In indoor lighting occasions such as houses, markets, museums, art studios, printing factories, textile factories, clothing factories and high-grade hotels, the importance of light quality is far higher than light efficiency, and the method plays a key role in shaping the whole indoor environment. There are many studies to improve the color temperature adjustment range and the color rendering index of white light by adjusting light and color, but the color tolerance SDCM is also important to improve the preference of white light. Studies have shown that white light has a higher visual preference [ J ] for monochromatic and color rendering indices when the color tolerance SDCM is less than or equal to 3 and the color coordinates are below the black body line (Feng X F, Xu W, Han Q Y, Zhang S D].Optics Express,2016, 24 (1): 573-585.). "Yu LiWhen high-quality white light is obtained by mixing different light sources, the color temperature, the color rendering index and the color tolerance should be optimized simultaneously, which provides a new challenge for the strategy of adjusting the spectrum.
In the past, although the traditional RGB three-primary-color LED mixed white light has a high radiant luminous efficacy, the white light lacks a yellow light band, resulting in a low color rendering index, particularly the ninth special color rendering index R9, which is not suitable for general illumination purposes. The LED white light technology commonly used at present uses a blue LED (with a peak wavelength of about 440-480 nm) to excite YAG phosphor, and the phosphor absorbs blue light and then emits yellow light, which is mixed with a portion of blue light transmitted through the phosphor to generate white light. The method effectively supplements the yellow light wave band, and the color rendering index reaches over 80, but the method still has slight defects. More research has been directed to using a mixture of multiple different light sources to produce a white light source with higher light quality.
Patent WO2013140296 proposes a white light source consisting of 3 or more light sources, wherein at least one obtains greenish white light from a blue LED + phosphor, at least one obtains bluish white light from a blue LED + phosphor, and at least one is a red or amber light emitting LED. The white light thus produced has a color rendering index of 85 or more and color coordinates close to the black body line. Patent US20130207570 proposes a method of generating a predetermined light color using 4 LEDs, which includes 1 red LED, 1 green LED, 1 blue LED, and a white LED, which emits light from a blue-excited YAG phosphor. White light with preset color coordinates can be obtained by adjusting the energy weight of the 4 LEDs, and the color rendering index can reach more than 90 in some cases. However, the above methods do not satisfy three optimization criteria at the same time: high color rendering index (Ra is more than or equal to 95, color rendering indexes R1-R8 are more than or equal to 90, and at least 5 special color rendering indexes R9-R15 are more than or equal to 90), and wide-range adjustment of color temperature (2000-8000K) and low color tolerance (SDCM is less than or equal to 3 and color coordinates are below a black body line).
Therefore, it is desirable to develop a white light source adjusting method that can achieve a high color rendering index and a wide color temperature adjusting range while optimizing the color tolerance SDCM.
Disclosure of Invention
The invention aims to provide a method for adjusting segmented color temperature by utilizing a plurality of full-spectrum white light sources.
The color temperature adjusting method provided by the invention obtains a target light source with high white light preference under the required color temperature by selecting and mixing a plurality of full-spectrum white light sources in a segmented manner, wherein the color tolerance SDCM is less than or equal to 3, and the specific steps are as follows:
step 1: selecting N (N is more than or equal to 3) full-spectrum white light sources: s1，S2，S3，…，SNRespectively, the color temperature of which is T1，T2，T3，…TN，1500K ≤ T1<T2<T3<…<TNLess than or equal to 8500K, and the color coordinates are distributed along the black body curve in the CIE1931xy chromaticity diagram;
step 2: setting a desired color temperature T of a target light sourcet，2000 K<Tt<8000K, obtaining an isochromatic temperature line corresponding to the color temperature near a black body curve in a CIE1931xy chromaticity diagram, wherein the linear equation isl：y=kx+b；
And step 3: setting the color coordinate of the target light source below the black body curve and the color tolerance SDCM not more than 3, so that the color coordinate of the target light source is positioned on a segment L of the straight line L below the black body curve and the SDCM not more than 3;
and 4, step 4: selecting 3 light sources (S) from the N full-spectrum white light sources in the step 1i、Si+1And Si+2) And satisfies the following conditions: (1) the color coordinates of the 3 light sources are closer to the color coordinates of the target light source; (2) the color coordinates of the 3 light sources are at least one on the left side of the color coordinates of the target light source and at least one on the right side of the color coordinates of the target light source;
and 5: 4, the 3 light sources selected in the step 4 are used for mixing to obtain the target light source, the color coordinate connecting lines of the 3 selected light sources enclose a triangle, a part of the line segment L in the step 3 is positioned in the triangle, and the part of the line segment L is intercepted to be the line segment LtLine segment LtEach color coordinate point is a white light color coordinate selectable by a target light source and corresponds to a different color tolerance SDCM;
step 6: line segment LtAll the color coordinate points above can be obtained by mixing the 3 light sources (S) selected in step 4 at different light flux ratiosi、Si+1And Si+2) Get, for the line segment LtThe different color coordinate points (namely, the coordinate points with different color tolerance SDCM) are solved by using a singular value equation to solve the S meeting the color coordinate pointsi、Si+1And Si+2And calculating the color tolerance SDCM, the general color rendering index Ra and the special color rendering index R1-R15 at different proportions;
and 7: selecting corresponding S according to the required color tolerance SDCM, general color rendering index Ra and special color rendering index R1-R15i、Si+1And Si+2The light flux proportion of the light source is adjusted by adopting pulse width modulation to obtain the light flux required by each light source, and a product is designed to obtain a target light source meeting the requirements.
The design method has another simplified implementation mode, and the specific steps are as follows:
step 1 to step 3 are the same as the step 1 to step 3;
and 4, step 4: selecting 2 light sources (S) from the N full-spectrum white light sources in the step 1i、Si+1) And satisfies the following conditions: (1) the color coordinates of the 2 light sources are closer to the color coordinates of the target light source; (2) the color coordinates of the 2 light sources are one on the left side of the color coordinates of the target light source and the other on the right side of the color coordinates of the target light source;
and 5: 4, the 2 light sources selected in the step 4 are used for being mixed to obtain a target light source, if a color coordinate connecting line M of the 2 selected light sources is intersected with the line segment L in the step 3 at a point N, the point N is the white light color coordinate of the target light source and corresponds to a color tolerance SDCM;
step 6: the color coordinate point N can be obtained by mixing 2 light sources (S) selected in step 4 at a certain light flux ratioi、Si+1) Obtaining and solving S satisfying the color coordinate point Ni、Si+1And calculating a color tolerance SDCM, a general color rendering index Ra, and special color rendering indices R1 to R15;
and 7: and (3) adopting pulse width modulation dimming to obtain the light flux required by 2 light sources, designing a product, and obtaining a target light source meeting the requirements.
In the invention, the color temperature adjusting range of the target light source obtained by the design method is 2000-8000K.
In the target light source obtained by the design method, the color tolerance SDCM of the white light color coordinate is less than or equal to 3 and is positioned below the black body curve in the CIE1931xy chromaticity diagram, so that the target light source has better white light preference.
In the invention, the target light source obtained by mixing colors under each SDCM at each color temperature is obtained by the design method, the general color rendering index Ra is more than or equal to 95, the color rendering indexes R1-R8 are more than or equal to 90, and at least 5 special color rendering indexes R9-R15 are more than or equal to 90.
Drawings
FIG. 1 shows the relative spectral energy distribution of a 3468K full spectrum white light source of the present invention.
FIG. 2 shows the relative spectral energy distribution of a 3953K full spectrum white light source of the present invention.
FIG. 3 shows the relative spectral energy distribution of a 5042K full spectrum white light source of the present invention.
FIG. 4 shows the relative spectral energy distribution of an 5956K full spectrum white light source of the present invention.
FIG. 5 is a graph of the relative spectral energy distribution of a 6474K full spectrum white light source of the present invention.
FIG. 6 shows the relative spectral energy distribution of a 3706K (target light source) full spectrum white light source of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples. The described embodiments are only some of the embodiments of the present invention. All other embodiments based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
The target light source with high white light preference under the required color temperature is obtained by selecting and mixing a plurality of full-spectrum white light sources in a segmented manner, and the color tolerance SDCM is less than or equal to 3. The specific design method comprises the following steps:
step 1: selecting 5 full spectrum white light sources (S)1，S2，S3，S4，S5) The color temperatures are 3468K, 3953K, 5042K, 5956K and 6474K respectively, the light color parameters are shown in Table 1, and the relative spectral distribution curves are shown in FIGS. 1-5;
step 2: setting the color temperature required by the target light source to be 3700K, and obtaining an isochromatic temperature line corresponding to the color temperature near a blackbody curve in a CIE1931xy chromaticity diagram, wherein the linear equation of the isochromatic temperature line isl：y=kx+b；
And step 3: setting the color coordinate of the target light source below the blackbody curve and the color tolerance SDCM less than or equal to 3, so that the color coordinate of the target light source is located on a straight linelOn a segment L below the blackbody curve and making SDCM less than or equal to 3;
and 4, step 4: selecting 2 light sources (S) from the 5 full-spectrum white light sources in the step 11、S2) Color temperatures of the 2 light sources are 3468K and 3953K, respectively, color coordinates thereof are closer to color coordinates of the target light source, and S2To the left of the color coordinates of the target light source and S1On the right of the target source color coordinates;
and 5: 2 light sources (S) selected in step 41、S2) The color coordinate connecting lines M of the 2 selected light sources are intersected with the line segment L in the step 3 at a point N, and the point N is the white light color coordinate of the target light source and corresponds to a color tolerance SDCM;
step 6: the color coordinate point N can be obtained by mixing 2 light sources (S) selected in step 4 at a certain light flux ratio1、S2) Obtaining and solving S satisfying the color coordinate point N1、S2The light flux ratio of (1) is solved to obtain S1:S2=1:1, where the color coordinates of the target light source obtained by mixing at this time are (0.393, 0.381) below the black body curve in the CIE1931xy chromaticity diagram, the color temperature is 3706K, the color rendering index Ra is 96, the color rendering indices R1-R15 are, in order, R1=99, R2=98, R3=94, R4=94, R5=98, R6=97, R7=95, R8=92, R9=86, R10=97, R11=93, R12=95, R13=100, R14=96, R15=98, and the color tolerance SDCM is 1.58, and the relative spectral distribution curve is as shown in fig. 6;
and 7: and (3) adopting pulse width modulation dimming to obtain the light flux required by 2 light sources, designing a product, and obtaining a target light source meeting the requirements.
TABLE 1 full-spectrum white light source photochromic parameters
。
Claims (2)
1. A method for adjusting segmented color temperature by utilizing a plurality of full-spectrum white light sources is characterized by comprising the following steps: the method comprises the following steps of obtaining a target light source with high white light preference under the required color temperature by selecting and mixing a plurality of full-spectrum white light sources in a segmented manner, wherein the color tolerance SDCM is less than or equal to 3, and the method comprises the following specific steps:
step 1: selecting N full-spectrum white light sources: s1，S2，S3，…，SNRespectively, the color temperature of which is T1，T2，T3，…TN，1500 K≤ T1<T2<T3<…<TNLess than or equal to 8500K, and the color coordinates are distributed along the black body curve in the CIE1931xy chromaticity diagram; n is more than or equal to 3;
step 2: setting a desired color temperature T of a target light sourcet，2000 K<Tt<8000K, obtaining an isochromatic temperature line corresponding to the color temperature near a black body curve in a CIE1931xy chromaticity diagram, wherein the linear equation isl：y=kx+b；
And step 3: setting the color coordinate of the target light source below the black body curve and the color tolerance SDCM not more than 3, so that the color coordinate of the target light source is positioned on a segment L of the straight line L below the black body curve and the SDCM not more than 3;
two cases are distinguished as follows:
in the first case:
and 4, step 4: selecting 3 light sources S from the N full-spectrum white light sources in the step 1i、Si+1And Si+2And satisfies the following conditions: (1) the color coordinates of the 3 light sources are closer to the color coordinates of the target light source; (2) the color coordinates of the 3 light sources are at least one on the left side of the color coordinates of the target light source and at least one on the right side of the color coordinates of the target light source;
and 5: the 3 light sources selected in the step 4 are used for mixing to obtain the target lightThe color coordinate connecting lines of the source and the selected 3 light sources enclose a triangle, a part of the line segment L in the step 3 is positioned in the triangle, and the part of the line segment L is intercepted as the line segment LtLine segment LtEach color coordinate point is a white light color coordinate selectable by a target light source and corresponds to a different color tolerance SDCM;
step 6: line segment LtAll the color coordinate points above can be obtained by mixing the 3 light sources S selected in step 4 in different light flux ratiosi、Si+1And Si+2Get, for the line segment LtThe S meeting the color coordinate point is solved by using a singular value equationi、Si+1And Si+2And calculating the color tolerance SDCM, the general color rendering index Ra and the special color rendering index R1-R15 at different proportions;
and 7: selecting corresponding S according to the required color tolerance SDCM, general color rendering index Ra and special color rendering index R1-R15i、Si+1And Si+2The light flux proportion of the light source is adjusted by adopting pulse width modulation to obtain the light flux required by each light source, and a product is designed to obtain a target light source meeting the requirement;
in the second case:
and 4, step 4: selecting 2 light sources from the N full-spectrum white light sources in the step 1: siAnd Si+1And satisfies the following conditions: (1) the color coordinates of the 2 light sources are closer to the color coordinates of the target light source; (2) the color coordinates of the 2 light sources are one on the left side of the color coordinates of the target light source and the other on the right side of the color coordinates of the target light source;
and 5: 4, the 2 light sources selected in the step 4 are used for being mixed to obtain a target light source, if a color coordinate connecting line M of the 2 selected light sources is intersected with the line segment L in the step 3 at a point N, the point N is the white light color coordinate of the target light source and corresponds to a color tolerance SDCM;
step 6: the color coordinate point N can be obtained by mixing the 2 light sources S selected in step 4 at a certain light flux ratioiAnd Si+1Obtaining and solving S satisfying the color coordinate point Ni、Si+1Light flux ofProportioning, and calculating the color tolerance SDCM, the general color rendering index Ra and the special color rendering indexes R1-R15;
and 7: and (3) adopting pulse width modulation dimming to obtain the light flux required by 2 light sources, designing a product, and obtaining a target light source meeting the requirements.
2. The method of claim 1, wherein the target light source is obtained by color mixing under SDCM at each color temperature, and has a general color rendering index Ra of 95 or more, color rendering indexes R1-R8 of 90 or more, and at least 5 special color rendering indexes R9-R15 of 90 or more.
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