Light source module, lighting system and lamp

Abstract

A light source module, a lighting system and a lamp. The light source module comprises a first light-emitting unit (100), a second light-emitting unit (200), a third light-emitting unit (300) and a fourth light-emitting unit (400) that are electrically independent of each other and emit different colors of light. The light colors of light-emitting units in the light source module are optimized, such that white light obtained by means of light mixing has a wide color temperature coverage range, the coverage range being 1800-20000 K; moreover, the light source module has good color rendering performance, the color rendering index (CRI) is larger than 90 within the color temperature range of 1800-20000 K, and the CRI is larger than 95 within the color temperature range of 2100-20000 K, and thus the light source module is applicable to the field of general indoor lighting. A plurality of light-emitting units are separately controlled by means of a driving circuit, so as to form a multi-color light-mixing lighting system that can achieve both high-quality white light and colorful ambient lighting.

Description

Light source modules, lighting systems and lamps

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202311578641.0 and title “Light source module, lighting system and lamp”, and the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202323178531.3 and title “Light source module, lighting system and lamp”. The entire contents of the above applications are incorporated into this application by reference. Technical Field

[0003] The present application relates to a light source module, a lighting system and a lamp. Background Art

[0004] Among various light sources, light-emitting diodes (LEDs) are widely used in various lighting devices, such as indoor and outdoor lighting, smart lighting, plant lighting, automotive lighting, indoor and outdoor display lighting, etc., due to their low power consumption and high luminous efficiency.

[0005] Typically, when dimming and color adjustment are required, one solution is to use the three primary colors of red, green, and blue. This three-primary color mixing method uses light-emitting diodes, whose primary components are single-wavelength LED chips. In this case, due to the narrow full-width half-maximum (FWHM) of the various monochromatic spectra, it cannot ensure a sufficient color rendering index, thus limiting the realization of the desired white light.

[0006] For color temperature adjustment, dual-color temperature dimming is typically used, mixing two white lights with different color temperatures to achieve color temperature adjustment. This approach has a limited adjustable color temperature range, and because the dimming trajectory is a line connecting the two color temperature coordinates on the CIE 1931 chromaticity diagram, when adjusted to an intermediate color temperature, the light color deviates significantly from a standard light source with the same color temperature.

[0007] Furthermore, to further expand the overall color temperature range of white light, the three primary colors of red, green, and blue (RGB) are typically added to the original single- or dual-color temperature white light for dimming and color adjustment. This is known as RGBW or RGBCW multi-color mixing. In this mixing method, if the target color temperature is within the single- or dual-color temperature range, the primary color is used for mixing. If the target color temperature falls outside this range, the three primary colors are mixed or a compensating color is used to achieve the desired target color temperature. Regardless of the method used, the color rendering of the resulting white light is guaranteed only within the color temperature range covered by the existing white light. Beyond this range, the light-emitting diodes used for the three primary colors are primarily single-wavelength LED chips, and the full-width at half-maximum (FWHM) of each color is relatively narrow. This results in poor spectral continuity in the resulting white light, and the overall color rendering index cannot be guaranteed to remain high. As people's living standards improve, the demand for lighting becomes more diversified. How to provide a lighting device that can present a wide color gamut and has high light quality has become an urgent problem to be solved. Summary of the Invention

[0008] The purpose of this application is to solve the above problems and propose a multi-color light source module, lighting system and lamp that can simultaneously take into account high-quality white light and colorful light atmosphere.

[0009] In order to achieve the above functions, the technical solution adopted by the present application is to provide a light source module, including a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are electrically independent of each other; the first light-emitting unit includes a first LED chip and a first package covering the first LED chip and a first phosphor, the wavelength of the main emission peak of the spectrum of the light emitted by the first light-emitting unit is between 445-460nm, the wavelength of the secondary emission peak is between 480-500nm, and the peak energy of the secondary emission peak is 10-50% of the peak energy of the main emission peak, and its light color is blue-green light in the quadrilateral area surrounded by four points A1 (0.18, 0.22), A2 (0.22, 0.28), A3 (0.24, 0.21), and A4 (0.19, 0.18) on the 1931 CIE chromaticity diagram; the second light-emitting unit includes a second LED chip, a second package covering the second LED chip and a second phosphor, the main emission peak of the spectrum of the light emitted by the second light-emitting unit is between 445-460nm, the wavelength of the secondary emission peak is between 480-500nm, and the peak energy of the secondary emission peak is 10-50% of the peak energy of the main emission peak. The wavelength is between 530-580nm, the spectral half width is 90-130nm, and the light color is yellow-green light located in the quadrilateral area surrounded by four points B1 (0.38, 0.51), B2 (0.40, 0.58), B3 (0.45, 0.53), and B4 (0.43, 0.46) on the 1931 CIE chromaticity diagram; the third light-emitting unit includes a third LED chip, a third package covering the third LED chip, and a third phosphor, and the third The wavelength of the main emission peak of the light emitting unit is between 620-655nm, the wavelength of the secondary emission peak is between 550-580nm, and the peak energy of the secondary emission peak is 0-40% of the peak energy of the main emission peak. The light color is orange-red light located in the quadrilateral area surrounded by four points C1 (0.55, 0.40), C2 (0.56, 0.44), C3 (0.68, 0.32), and C4 (0.65, 0.31) on the 1931 CIE chromaticity diagram.

[0010] The present application also provides a lighting system, comprising: a light source and a driving circuit, wherein the light source comprises at least one light source module as described above; the driving circuit is electrically connected to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit, respectively, and supplies power thereto, and the driving circuit controls the current / voltage provided to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit, respectively.

[0011] The present application also provides a lamp, comprising the light source module or lighting system as described above.

[0012] The light source module, lighting system, and lamp provided in this application optimize the color of the monochromatic light-emitting units within the light source module, thereby achieving a wide range of white light color temperatures, from 1800K to 20000K. Furthermore, the light source module exhibits excellent color rendering, with a color rendering index (CRI) greater than 90 within the 1800-20000K color temperature range and a CRI greater than 95 within the 2100K-20000K color temperature range. This performance surpasses the light quality of existing all-in-one light sources such as RGB and RGBW, making it more suitable for general indoor lighting. Furthermore, by controlling multiple light-emitting units, it can accommodate multiple colors, forming a multi-color mixed light system that combines high-quality white light with a colorful light atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic structural diagram of a light source module according to an embodiment of the present application;

[0014] 2 is a color point distribution diagram of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit in the light source module according to an embodiment of the present application on the CIE 1931 chromaticity diagram;

[0015] 3 is a spectral energy distribution diagram of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit in the light source module according to an embodiment of the present application;

[0016] 4a, 4b, and 4c are spectral energy distribution diagrams of white light of different color temperatures generated by mixing the light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit of the light source module according to an embodiment of the present application;

[0017] 5a, 5b, and 5c are spectral energy distribution diagrams of the light source module at different color temperatures when the fourth light-emitting unit of the light source module of the embodiment of the present application is selected as 4000K white light;

[0018] 6a, 6b, and 6c are spectral energy distribution diagrams of the light source module at different color temperatures when the fourth light-emitting unit of the light source module of the embodiment of the present application is selected as 5000K white light;

[0019] Figures 7a, 7b, 7c, 7d, 7e, and 7f are schematic diagrams of packaging structures of light source modules according to other embodiments of the present application;

[0020] FIG8 is a schematic structural diagram of a lighting system according to an embodiment of the present application;

[0021] FIG9 is a schematic structural diagram of a lamp according to an embodiment of the present application;

[0022] FIG10 is a schematic structural diagram of a light source module according to another embodiment of the present application;

[0023] FIG11 is a light path diagram of a single lens in FIG10 ;

[0024] FIG. 12 is a diagram comparing the diameters of the lenses in FIG. 10 . DETAILED DESCRIPTION

[0025] The light source module, lighting system and lamp proposed in the present application are further described in detail below with reference to the accompanying drawings and some embodiments consistent with the present application.

[0026] A specific embodiment of the light source module of the present application is a mixed light LED package chip, and the packaging form can be PLCC chip packaging, ceramic chip packaging, CSP packaging, all-in-one single chip packaging or COB chip integrated packaging, which is not limited in the present application.

[0027] The structure of a specific embodiment is shown in Figure 1. The light source module 1 includes a main body 60 and a plurality of light-emitting units disposed on the main body 60 and spaced apart from each other: a first light-emitting unit 100, a second light-emitting unit 200, a third light-emitting unit 300, and a fourth light-emitting unit 400. Each light-emitting unit 100, 200, 300, 400 includes an LED chip 101, 201, 301, 401 and a package 102, 202, 302, 402 covering it. The LED chip (LED chip) can be mounted face-up or flip-up, with a single LED chip or multiple LED chips connected in series, parallel, or series-parallel. In this embodiment, to accommodate the packages 102, 202, 302, 402, the main body 60 is a plastic bracket with a plurality of accommodating grooves 61, 62, 63, 64 therein. The plastic bracket can be made of any of PPA, PCT, and EMC. Each LED chip 101, 201, 301, and 401 is disposed in a receiving groove 61, 62, 63, and 64, respectively, and each has a pair of pins 51a, 51b, 52a, 52b, 53a, 53b, 54a, and 54b. The pins 51a, 51b, 52a, 52b, 53a, 53b, 54a, and 54b are electrically isolated from each other. The package 102, 202, 302, and 402 is made of a silicone-based resin, an epoxy resin, or a combination thereof. It fills the receiving grooves 61, 62, 63, and 64, respectively, and covers the LED chips 101, 201, 301, and 401, ensuring electrical isolation between the light-emitting units 100, 200, 300, and 400.

[0028] In this embodiment, a mixed light solution of multiple light sources is adopted, wherein the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 emit blue-green light, yellow-green light, and orange-red light respectively, and the combination of these three can form white light, as follows.

[0029] The first light-emitting unit 100 includes a first LED chip 101, a first package 102, and a first phosphor. The first LED chip 101 is placed at the bottom of the first receiving groove 61 and is electrically connected to the outside through two pins 51a and 51b. The first package 102 fills the first receiving groove 61 and covers the first LED chip 101. The first LED chip 101 is a blue light LED that emits blue light with a peak wavelength in the range of 450-465nm. The first package 102 contains a first phosphor 103, which includes at least one blue-green phosphor with a peak wavelength in the range of 485-515nm and at least one yellow-green phosphor with a peak wavelength in the range of 520-580nm. In order to obtain a wider FWHM, the first phosphor 103 contains two phosphors with different peak wavelengths, blue-green and yellow-green. Of course, the blue-green phosphor and yellow-green phosphor mentioned here are not limited to only one chemical component. They can also be mixed phosphors, that is, more than one phosphor can be mixed to finally form the blue-green phosphor or yellow-green phosphor we need. The blue-green phosphor can be (Ba, Sr) Si2N2O2: Eu. The yellow-green phosphor can be (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce, or any combination thereof. After the first LED chip 101 excites the first phosphor 103, the spectral energy distribution of the light emitted by the first light-emitting unit 100 is shown as curve 100 in Figure 3. Figure 3 is a graph of relative spectral intensity. Each curve in the figure is normalized, and each point on the curve represents the energy level at a certain wavelength on the horizontal axis. The main emission peak wavelength of the light emitted by the first light-emitting unit 100 is between 445 and 460 nm, and the secondary emission peak wavelength is between 480 and 500 nm. The peak energy of the secondary emission peak is 10-50% of the peak energy of the main emission peak. The light emitted by the first light-emitting unit 100 has a blue-green color and is located within the quadrilateral area enclosed by points A1 (0.18, 0.22), A2 (0.22, 0.28), A3 (0.24, 0.21), and A4 (0.19, 0.18) on the 1931 CIE chromaticity diagram, i.e., area A in Figure 2.

[0030] The second light-emitting unit 200 includes a second LED chip 201 and a second package 202. The second LED chip 201 is placed at the bottom of the second receiving groove 62 and is electrically connected to the outside through two pins 52a and 52b. The second package 202 fills the second receiving groove 62 and covers the second LED chip 201. The second LED chip 201 is a blue LED that emits blue light with a peak wavelength in the range of 445-455nm. The second package 202 contains a second phosphor 203, which includes at least one yellow-green phosphor. The yellow-green phosphor can be selected from (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce, any one or a combination of the following. After the second LED chip 201 excites the second phosphor 203, the light emitted by the second light-emitting unit 200 has a peak wavelength of 530-580 nm and a spectral half-width (FWHM) of 90-130 nm. The spectral half-width refers to the full-width half-maximum (FWHM) of an emission peak on a spectrum graph. Its spectral energy distribution is shown as curve 200 in Figure 3. The light emitted by the second light-emitting unit 200 is yellow-green in color. On the 1931 CIE chromaticity diagram, it is located within the quadrilateral area enclosed by points B1 (0.38, 0.51), B2 (0.40, 0.58), B3 (0.45, 0.53), and B4 (0.43, 0.46), designated as area B in Figure 2. Because most of the energy emitted by the second LED chip 201 is converted into yellow-green light by the second phosphor 203, the blue light content of the light emitted by the second light-emitting unit 200 is less than 30%. The blue light content is less than 30%, which means that the energy in the blue light band of 440-480nm accounts for less than 30% of the total energy in the light emitted by the light-emitting unit.

[0031] The third light-emitting unit 300 includes a third LED chip 301 and a third package body 302. The third LED chip 301 is placed at the bottom of the third receiving groove 63 and is electrically connected to the outside through two pins 53a and 53b. The third package body 302 fills the third receiving groove 63 and covers the third LED chip 301. The third LED chip 301 is a blue light LED, emitting blue light with a peak wavelength in the range of 445-455nm. The third package body 302 contains a third phosphor 303, which includes at least one yellow-green phosphor with a peak wavelength of 520-580nm and at least one red phosphor with a peak wavelength of 620-655nm. The third phosphor 303 needs to include both yellow-green and red phosphors. Of course, these two phosphors can also be mixed phosphors. The yellow-green phosphor can be selected from (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce or any one of them or a combination of them. Red phosphor can be selected from CaAlSiN3:Eu, (Ca, Sr)AlSiN3:Eu, (Ba, Sr, Ca, Mg)2Si5N8:Eu, K2SiF6:Mn 4+ 、K2GeF 6 :Mn 4+ 、K2TiF6:Mn 4+ Any one or more combinations thereof. After the second phosphor 303 is excited by the third LED chip 301, the third light-emitting unit 300 emits light with a primary emission peak wavelength between 620-655 nm and a secondary emission peak wavelength between 550-580 nm. The peak energy of the secondary emission peak is 0-40% of the peak energy of the primary emission peak. Its spectral energy distribution is shown as curve 300 in Figure 3. The light emitted by the third light-emitting unit 300 is orange-red and, on the 1931 CIE chromaticity diagram, is located within the quadrilateral region enclosed by points C1 (0.55, 0.40), C2 (0.56, 0.44), C3 (0.68, 0.32), and C4 (0.65, 0.31), designated as region C in Figure 2. Because most of the energy emitted by the third LED chip 301 is converted into orange-red light by the second phosphor 303, the blue light content of the light emitted by the third light-emitting unit 300 is less than 10%.

[0032] In the above embodiment, it can be seen that although the first LED chip 101, the second LED chip 201, and the third LED chip 301 are all blue light chips, they are selected with different peak wavelengths. Phosphors typically have a wide distribution in terms of full-width half-maximum (FWHM), while single-color LED chips have a narrower FWHM. In this embodiment, although a cyan phosphor is selected in the first light-emitting unit 100, some blue light is not converted to maintain energy within the blue wavelength band, ensuring a uniform energy distribution across all wavelengths and good color rendering. In the blue light region, given the narrow FWHM of the LED chips, selecting chips with different peak wavelengths can create a superposition, resulting in a more uniform energy distribution across the blue light region and better color rendering. In this embodiment, two types of LED chips are selected: the first LED chip 101 is the first type, with a peak wavelength of 450-465nm, and the second LED chip 201 and the third LED chip 301 are the same type, with a peak wavelength of 445-455nm. In an optional solution, the difference in peak wavelength between the two LED chips must be greater than or equal to 5 nm. In other embodiments, the first LED chip 101, the second LED chip 201, and the third LED chip 301 can all be different, thereby achieving a wider FWHM. However, since each LED chip in the light source module 1 is independently powered and controlled, selecting too many LEDs may complicate control settings. Flexible selection can be made based on design requirements.

[0033] We all know that the three primary colors can be mixed to form white light. Previous solutions have used RGB (RGB) light mixing to create white light. In this embodiment, the existing RGB solution is optimized by selecting different light colors. The first light-emitting unit 100 emits blue-green light, the second light-emitting unit 200 emits yellow-green light, and the third light-emitting unit 300 emits orange-red light. Mixing these three light sources also creates white light. By individually dimming these three light-emitting units, white light with various color temperatures can be mixed. In this embodiment, a PWM signal is used as the control signal to independently control the three color light-emitting units through PWM dimming. Different duty cycles are applied to modulate the luminous power of each light-emitting unit to achieve a mixed light effect. Table 1 lists the duty cycles of the PWM signals used to modulate the three light-emitting units under different conditions, as well as the relative color temperature (CCT), color deviation (Duv), and color rendering index (CRI) after mixing.

[0034] Table 1

[0035] The relative spectra of white light within each column listed in the table are shown in Figures 4a, 4b, and 4c. Figure 4a corresponds to categories Tri_a1, Tri_b1, and Tri_c1; Figure 4b corresponds to categories Tri_d1, Tri_e1, and Tri_f1; and Figure 4c corresponds to categories Tri_g1, Tri_h1, and Tri_i1. As can be seen from Table 1, the white light emitted by the mixed light from the first, second, and third light-emitting units 100, 200, and 300 in this embodiment covers a wide color temperature range, from 1800 to 20,000 Kelvin. The color deviation Duv from blackbody radiation is less than 0.003, and good color rendering is achieved, with a color rendering index (CRI) greater than 90 at all color temperatures.

[0036] Table 1 shows the relationship between the relative color temperature and color rendering index of the light source module 1. The color rendering index in the intermediate color temperature range still has room for improvement. In one embodiment, the light source module 1 incorporates a fourth light-emitting unit 400 in addition to the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 to further optimize the overall light quality.

[0037] The fourth light-emitting unit 400 includes a fourth LED chip 401 and a fourth package body 402. The fourth LED chip 401 is placed at the bottom of the fourth receiving groove 64 and is electrically connected to the outside through two pins 54a and 54b. The fourth package body 402 fills the fourth receiving groove 64 and covers the fourth LED chip 401. The fourth LED chip 401 is a blue light LED, emitting blue light with a peak wavelength in the range of 445-455nm. In this embodiment, the fourth LED chip 401 is a chip of the same model as the second LED chip 201 and the third LED chip 301, and maintains a peak wavelength difference of 5nm with the first LED chip 101. In other embodiments, other models of blue light chips can also be selected, and this application does not limit this.

[0038] The fourth package 402 contains a fourth phosphor 403. The fourth light-emitting unit 400 emits white light. Therefore, the fourth phosphor 403 is a mixture of multiple phosphors, including at least one blue-green phosphor with a peak wavelength between 485 and 515 nm, at least one yellow-green phosphor with a peak wavelength between 520 and 580 nm, and at least one red-orange phosphor with a peak wavelength between 615 and 655 nm. In this embodiment, the blue-green phosphor is (Ba, Sr)Si2N2O2:Eu; the yellow-green phosphor can be (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, (Ba,Sr,Ca,Mg)SiO4:Eu, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12:Ce one or more mixtures; red-orange phosphors are CaAlSiN3:Eu, (Ca, Sr)AlSiN3:Eu, (Ba, Sr, Ca, Mg)2Si5N8:Eu, K2SiF6:Mn 4+ 、K2GeF 6 :Mn 4+ 、K2TiF6:Mn 4+ The phosphors are mixed to form a fourth phosphor 403, which is excited by the fourth LED chip 402, and the light emitted by the fourth light-emitting unit 400 is white light.

[0039] The first, second, and third light-emitting units 100, 200, and 300 already generate white light. We hoped to add additional features to the fourth light-emitting unit 400. With increasing demands for light quality, people are increasingly concerned with the relationship between lighting and circadian rhythms. Research has demonstrated a correlation between different lighting environments and melatonin secretion. Therefore, we specifically incorporated the Melanopic Daylight Efficiency Ratio (MDER) into the fourth light-emitting unit 400. By compensating for specific wavelengths in the spectrum, particularly the cyan and yellow bands, the resulting mixed white light spectrum exhibits greater spectral continuity.

[0040] MDER is the ratio of the equivalent melanopic illuminance of the calculated light source to that of daylight (D65 standard light source). It is calculated by measuring the relative intensity of each wavelength and using a specified formula to weight the melanopic and photopic illuminance ratios. The specific formula is as follows:

[0041] in:

[0042] EDI_mel(D65): melanin sensitivity illuminance equivalent to D65 standard light source;

[0043] Ev: photopic visual sensitivity illuminance;

[0044] P(λ): spectral power distribution of the light source to be measured;

[0045] V(λ): photopic luminous efficiency function;

[0046] M(λ): light sensitivity function of melanopsin photoreceptor cells (ipRGC).

[0047] The above calculation formula is based on the parameter definition and calculation method published by CIE S026.

[0048] In one solution, the fourth light-emitting unit 400 can be a white light chip with a relative color temperature of 4000 ± 250K, a color rendering index greater than 90, and an MDER greater than 0.65. Similarly, we independently control the four color light-emitting units using a PWM control signal, applying different duty cycles to modulate the luminous power of each light-emitting unit to achieve a mixed light effect. Table 2 lists the relative color temperature (CCT), color deviation (Duv), and color rendering index (CRI) achieved by mixing the light with the fourth light-emitting unit 400 and by adjusting the duty cycles of the PWM signals of the four light-emitting units.

[0049] Table 2

[0050] Figures 5a, 5b, and 5c show the relative spectra of white light in the columns listed in Table 2. Figure 5a corresponds to the categories For_a1, For_b1, and For_c1, Figure 5b corresponds to the categories For_d1, For_e1, and For_f1, and Figure 5c corresponds to the categories For_g1, For_h1, and For_i1.

[0051] In another solution, the fourth light-emitting unit 400 can be a white light chip with a relative color temperature of 5000 ± 250K, a color rendering index greater than 90, and an MDER greater than 0.75. Similarly, we independently control the four color light-emitting units using a PWM control signal, applying different duty cycles to modulate the luminous power of each light-emitting unit to achieve a mixed light effect. Table 3 lists the relative color temperature (CCT), color deviation (Duv), and color rendering index (CRI) achieved by mixing the light with the fourth light-emitting unit 400 and by adjusting the duty cycles of the PWM signals of the four light-emitting units.

[0052] Table 3

[0053] Figures 6a, 6b, and 6c show the relative spectra of white light in the columns listed in Table 3. Figure 6a corresponds to the categories For_a2, For_b2, and For_c2; Figure 6b corresponds to the categories For_d2, For_e2, and For_f2; and Figure 6c corresponds to the categories For_g2, For_h2, and For_i2.

[0054] As shown in Tables 2 and 3, the addition of the fourth light-emitting unit 400 further improves the color rendering of light source module 1 within the original white light color temperature range of 1800-20000K. For both fourth light-emitting unit 400 options, the color rendering index (CRI) reaches above 95 when the color temperature is between 2100-20000K.

[0055] In the embodiment of FIG1 , a packaging structure of the light source module 1 is shown, in which four light-emitting units are packaged as one. In other embodiments, each light-emitting unit can also be packaged independently and finally arranged on the same substrate to form the light source module 1. In addition, they can be packaged in groups of two, or the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can be packaged as one, while the fourth light-emitting unit 400 can be packaged independently. This application does not limit this. There are many packaging structures that can be used for independent packaging. We take the fourth light-emitting unit 400 as an example to illustrate some other packaging forms. The packaging structure of the embodiment of FIG7a and FIG7b also adopts a bracket structure as the embodiment of FIG1 , and a receiving groove is formed on the bracket. The figure only shows a single light-emitting unit in the light source module 1 - the fourth light-emitting unit 400, so the receiving groove is the fourth receiving groove 64. In the embodiment of FIG7a , after the fourth LED chip 401 is placed, it is electrically connected to the outside through the pins 54a and 54b. The fourth phosphor 403 is first applied to the surface of the fourth LED chip 401 by spraying or coating, and then the fourth receiving groove 64 is filled with the fourth package 402. In Figure 7b, the fourth receiving groove 64, which already contains the fourth LED chip 401, is first filled with the fourth package 402, and then the fourth phosphor 403 is applied to the upper surface of the fourth package 402 by spraying or coating. As previously mentioned, the fourth phosphor 403 of the fourth light-emitting unit 400 includes a variety of different phosphors. The difference between the package structure of Figure 7c and Figure 7b is that the different types of phosphors are applied in layers, thus forming the double-layer structure shown in the figure. Figure 7d illustrates a high-power ceramic package. A ceramic or metal substrate 94 is used. A fourth LED chip 401 is mounted on the substrate 94. A fourth phosphor 403 is applied to the surface of the fourth LED chip 401 to form a light conversion layer by spraying, laminating with a fluorescent film, or attaching a fluorescent ceramic sheet. The fourth package body 402 is then filled and filled to cover the fourth phosphor 403 and the fourth LED chip 401 by injection molding. Figure 7e illustrates a CSP package suitable for high-power chips. A ceramic or metal substrate 94 is used. After the fourth phosphor 403 and the fourth package body 402 are mixed, a light conversion layer is formed on the surface of the fourth LED chip 401 by laminating with a fluorescent film. Figure 7f has a similar structure to Figure 7e. Also using a ceramic or metal substrate 94, a fourth phosphor 403 is applied to the surface of the fourth LED chip 401 to form a light conversion layer by spraying or laminating with a fluorescent film. The fourth package body 402 is then positioned on the outer surface of the fourth phosphor. All of the above approaches can achieve the objectives of this application and are not intended to be limiting.

[0056] Another embodiment of the light source module of the present application is shown in Figure 10, which includes a light source board 6 and four light-emitting units disposed on the light source board, namely, a first light-emitting unit 100, a second light-emitting unit 200, a third light-emitting unit 300, and a fourth light-emitting unit 400, and four lenses corresponding to these light-emitting units, namely, a first lens 501, a second lens 502, a third lens 503, and a fourth lens 504. The first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 respectively cover the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400. The spectrum and light color of the four light-emitting units are the same as those in the previous embodiment and will not be repeated here.

[0057] As we know, the refractive index of light of different frequencies in the same medium varies. For the lens in this embodiment, PC material is used. Light with a wavelength of 457.7 nm has a refractive index of 1.60567 in PC, while light with a wavelength of 629.9 nm has a refractive index of 1.58071. This indicates that the longer the wavelength, the lower the refractive index. Therefore, it is necessary to design an optical lens specifically for each spectrum. Since the spectrum of white light covers the entire range from 380 nm to 780 nm, we calculated the wavelength of 555 nm for white light.

[0058] Referring to FIG4 , according to the refractive index theorem: n1*sinθ1=n2*sinθ2 and n2*sinθ3=n3*sinθ4;

[0059] Where n1=n3=1, n2 is the refractive index of different spectra.

[0060] θ1 is the incident angle formed by the light emitted from the light source on the light incident surface 5051, and θ2 is the exit angle formed by the light emitted from the light incident surface 5051 on the light incident surface 5051. The value of θ1 is determined based on the angle between the incident light of the light source and the normal of the incident surface. The curved shape of the light incident surface can be obtained by rotating any free curve or quadratic curve (such as a parabola, ellipse or circle, etc.). By differentiating the shape of the light incident surface, its tangent equation can be obtained, and thus its normal equation can be obtained. The specific value of θ1 can be obtained based on the incident light and the normal, and then θ2 = arcsin (n2 * sinθ2 / sinθ1) can be obtained based on n1*sinθ1 = n2*sinθ2. Among them, the exit light of the light incident surface 5051 is also the incident light of the light exit surface 5052. According to the geometric relationship, θ3 = f(θ2) can be calculated to obtain θ3. The outgoing light ray θ4 is the desired angle of incidence, which is set according to our needs. Given n2, θ3, n3 and θ4, the normal slope of the light-emitting surface 5052 can be calculated according to the vector form of the law of refraction. Based on the perpendicular relationship between its normal and tangent, the slope of the tangent can be obtained, thereby obtaining the light-emitting surface curve.

[0061] In this embodiment, the light entrance surface 5051 of each lens is identical, and the final light exit angle is required to be the same. According to the above calculations, the smaller the wavelength, the greater the refractive index, and the smaller the lens light exit surface size. Therefore, the lens sizes corresponding to different wavelengths are different. As shown in Figure 12, the diameter d1 of the first lens 501 is less than the diameter d2 of the second lens 502, less than the diameter d4 of the fourth lens 504, and less than the diameter d3 of the third lens 503. Therefore, the size of the third lens 503 covering red light is larger than the size of the first lens 503 covering blue light. Since white light is calculated based on wavelength 555, the size of the fourth lens 504 covering white light is between the third lens 503 and the first lens 501. Specifically, the diameter d1 of the first lens 501 is 0.90 to 0.98 times the diameter d4 of the fourth lens 504 ; the diameter d2 of the second lens 502 is 0.95 to 1.00 times the diameter d4 of the fourth lens 504 ; and the diameter d3 of the third lens 503 is 1.00 to 1.10 times the diameter d4 of the fourth lens 504 .

[0062] In this embodiment, the first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 are integrated into a light distribution module 5. The fourth lens 504 is positioned in the center, and the remaining three lenses are positioned around the fourth lens 504. The centers of the first lens 501, the second lens 502, and the third lens 503 are evenly distributed, i.e., equiangularly distributed, on a circumferential surface coaxial with the fourth lens.

[0063] Another embodiment of the present application is a lighting system as shown in FIG8 , which includes the light source module 1 and the driving circuit 2 in the above embodiment.

[0064] The driving circuit 2 includes a power conversion module 21, a control module 22 and an LED driving module 23. The power conversion module 21 is connected to an external power source and converts the external power source into the DC power required by the light source module 1. The control module 22 includes a communication module that receives dimming / color adjustment commands from the outside and generates a control signal based on this. The communication module can be a wired or wireless communication module, which is not limited in this application. The LED driving module 23 inputs the DC power output by the power conversion module 21 and the control signal from the control module 22, adjusts the DC power according to the control signal, and outputs the adjusted driving current / voltage required by each light-emitting unit to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 in the light source module 1 respectively. Therefore, the LED driving module 23 needs to be electrically connected to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 respectively. When the lighting system includes multiple light source modules 1, as shown in Figure 8, the first light emitting unit 100, the second light emitting unit 200, the third light emitting unit 300, and the fourth light emitting unit 400 in each light source module 1 are connected in series and electrically connected to the LED driving module 23.

[0065] As previously mentioned, the color temperature of the light source module 1 of the embodiment is adjustable in a range from 1800-20000K. Therefore, the control module 22 includes a storage module that stores preset control parameter values. The control parameter values ​​are the control parameter values ​​corresponding to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 when the light source module 1 generates different color temperatures. The control parameter value can be a voltage value, a current value, or a PWM signal. When the light-emitting unit does not participate in light mixing, the control parameter value of the light-emitting unit is zero. When a color temperature change request is sent from the outside, the control module 22 receives the command, reads the relevant value in the storage module, forms a control signal and sends it to the LED driver module 23, and adjusts the current / voltage output to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400, so that the light source module 1 emits the target color light or white light of the corresponding color temperature. In this embodiment, the preset control parameters are the duty cycles of the PWM signals of each light-emitting unit as shown in Tables 1, 2, and 3. Because light source module 1 selects light-emitting units of specific colors and controls them according to preset parameters, the resulting white light has a wider color temperature range than the white light obtained by mixing light using existing technologies, ranging from 1800K to 20000K, and a color deviation Duv from blackbody radiation of less than 0.003. At the same time, this light source module has excellent color rendering properties, with a color rendering index (CRI) greater than 90 in the color temperature range of 1800-20000K and a CRI greater than 95 in the color temperature range of 2100K-20000K. This surpasses the light quality of existing all-in-one light sources such as RGB and RGBW, making it more suitable for general indoor lighting. Furthermore, by controlling multiple light-emitting units, it can be compatible with colored lights. By adjusting the light output ratios to the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300, various colored ambient lights can be formed, realizing a colored lighting system.

[0066] The above-mentioned light source module and lighting system can be applied to various types of lamps. Figure 9 shows a lamp D1 according to an embodiment of the present application. The lamp D1 is a lamp panel, including the lighting system described above. In other embodiments, it can also be a chandelier, a ceiling lamp, etc., or the light source module 1 can also be used as an ordinary white light chip in various types of lamps such as table lamps, downlights, and spotlights. The lamp D1 includes a chassis 86, a surface frame 88 provided with a diffusion plate 89, a plurality of light source modules 1 arranged on the light source board 85, and a power box 87. The aforementioned drive circuit 2 is arranged in the power box 87. In the lamp, the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 in the light source module 1 are wired separately, and the same type of light-emitting units in each light source module 1 are connected in series and connected to the drive circuit 2 in the power box 87 to form the aforementioned lighting system. The lamp D1 can also be provided with a controller, a heat dissipation device, and a light distribution component according to the function and requirements of the specific lamp. The controller can be used to adjust the color and intensity of the light emitted by the light source module L1, and the light distribution component can be a lampshade, lens, diffusion element, light guide, etc. in addition to the diffusion plate in the embodiment. This application does not limit this.

[0067] The above description of the embodiments of the present application is for illustration and description, and is not intended to be exhaustive or limited to the specific forms disclosed. Obviously, many modifications and changes may be made, which may be obvious to those skilled in the art and should be included within the scope of the present application defined by the appended claims.

Claims

1. A light source module, comprising a first light emitting unit, a second light emitting unit, and a third light emitting unit which are electrically independent of each other; The first light-emitting unit includes a first LED chip, a first package covering the first LED chip, and a first phosphor. The wavelength of the main emission peak of the spectrum of light emitted by the first light-emitting unit is between 445-460nm, the wavelength of the secondary emission peak is between 480-500nm, and the peak energy of the secondary emission peak is 10-50% of the peak energy of the main emission peak. The light color is blue-green light located in a quadrilateral area surrounded by four points A1 (0.18, 0.22), A2 (0.22, 0.28), A3 (0.24, 0.21), and A4 (0.19, 0.18) on the 1931 CIE chromaticity diagram; The second light-emitting unit includes a second LED chip, a second package covering the second LED chip, and a second phosphor. The wavelength of the main emission peak of the spectrum of the light emitted by the second light-emitting unit is between 530-580nm, the half-width of the spectrum is 90-130nm, and the light color is yellow-green light located in a quadrilateral area surrounded by four points B1 (0.38, 0.51), B2 (0.40, 0.58), B3 (0.45, 0.53), and B4 (0.43, 0.46) on the 1931 CIE chromaticity diagram; The third light-emitting unit includes a third LED chip, a third package covering the third LED chip, and a third phosphor. The wavelength of the main emission peak of the spectrum of light emitted by the third light-emitting unit is between 620-655nm, the wavelength of the secondary emission peak is between 550-580nm, and the peak energy of the secondary emission peak is 0-40% of the peak energy of the main emission peak. The light color is orange-red light located in a quadrilateral area surrounded by four points C1 (0.55, 0.40), C2 (0.56, 0.44), C3 (0.68, 0.32), and C4 (0.65, 0.31) on the 1931 CIE chromaticity diagram.

2. The light source module according to claim 1, wherein: The blue light content of the second light emitting unit is less than 30%, and the blue light content of the third light emitting unit is less than 10%.

3. The light source module according to claim 1, wherein: The first LED chip, the second LED chip and the third LED chip include at least two types of LED chips, one of which has a peak wavelength of 450-465nm and the other has a peak wavelength of 445-455nm, and the difference between the peak wavelengths of the two LED chips is greater than or equal to 5nm.

4. The light source module according to claim 1, wherein: The first phosphor includes at least one blue-green phosphor with a peak wavelength of 485-515 nm and at least one yellow-green phosphor with a peak wavelength of 520-580 nm, wherein the blue-green phosphor is (Ba, Sr)Si2N2O2:Eu; the yellow-green phosphor is (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce.

5. The light source module according to claim 1, wherein: The second phosphor includes at least one yellow-green phosphor with a peak wavelength between 520 and 580 nm, and the yellow-green phosphor is (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce.

6. The light source module according to claim 1, wherein: The third phosphor includes at least one yellow-green phosphor with a peak wavelength of 520-580 nm and at least one red phosphor with a peak wavelength of 620-655 nm. The yellow-green phosphor is (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce; the red phosphor is CaAlSiN3:Eu, (Ca, Sr)AlSiN3:Eu, (Ba, Sr, Ca, Mg)2Si5N8:Eu, K2SiF6:Mn 4+ ,K2GeF 6 :Mn 4+ 、K2TiF6:Mn 4+ .

7. The light source module according to claim 1, wherein: The color temperature of white light formed by mixing the light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is adjustable within the range of 1800-20000K, and the color deviation Duv from the black body radiation is less than 0.

003.

8. The light source module according to claim 7, wherein: The color rendering index (CRI) of the white light formed by mixing the light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is greater than 90 in the color temperature range of 1800-20000K.

9. The light source module according to claim 1, wherein: The light source module also includes a fourth light-emitting unit, which includes a fourth LED chip, a fourth package covering the fourth LED chip, and a fourth phosphor. The fourth light-emitting unit emits white light, and its color temperature is 4000K±250K, the color rendering index is greater than 90, and the dark vision daylight efficiency ratio MDER is greater than 0.65; or the color temperature is 5000±250K, the color rendering index is greater than 90, and the MDER is greater than 0.

75.

10. The light source module according to claim 9, wherein: The fourth phosphor includes at least one blue-green phosphor with a peak wavelength of 485-515 nm, at least one yellow-green phosphor with a peak wavelength of 520-580 nm, and at least one red-orange phosphor with a peak wavelength of 615-655 nm. The blue-green phosphor is (Ba, Sr)Si2N2O2:Eu; the yellow-green phosphor is (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce, (Ba, Sr, Ca, Mg)SiO4:Eu; the red-orange phosphor is CaAlSiN3:Eu, (Ca, Sr)AlSiN3:Eu, (Ba, Sr, Ca, Mg)2Si5N8:Eu, K2SiF6:Mn 4+ ,K2GeF 6 :Mn 4+ 、K2TiF6:Mn 4+ .

11. The light source module according to claim 9, wherein: The light source module is a packaged chip, which includes a main body, on which are provided a first receiving groove, a second receiving groove, a third receiving groove and a fourth receiving groove; the first LED chip and the first phosphor are arranged in the first receiving groove, the second LED chip and the second phosphor are arranged in the second receiving groove, the third LED chip and the third phosphor are arranged in the third receiving groove, the fourth LED chip and the fourth phosphor are arranged in the fourth receiving groove; the first package, the second package, the third package and the fourth package fill the first receiving groove, the second receiving groove, the third receiving groove and the fourth receiving groove respectively; the first package, the second package, the third package and the fourth package cover the first LED chip, the second LED chip, the third LED chip and the fourth LED chip respectively.

12. The light source module according to claim 9, wherein: The light source module includes a light source board, the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit are arranged on the light source board, the first lens, the second lens, the third lens, and the fourth lens are distributed and cover the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit, the first lens, the second lens, the third lens, and the fourth lens are convolute lenses, and the first lens, the second lens, and the third lens are evenly distributed around the fourth lens along the circumference.

13. The light source module according to claim 9, wherein: When the color temperature of the white light emitted by the light source module is within the range of 2100-20000K, the color rendering index CRI is greater than 95.

14. A lighting system, wherein: include: Light source and driving circuit, The light source comprises at least one light source module according to any one of claims 1 to 13; The driving circuit is electrically connected to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively and supplies power thereto, and the driving circuit controls the current / voltage provided to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively.

15. A lamp, wherein: It comprises the light source module as claimed in any one of claims 1 to 13, or comprises the lighting system as claimed in claim 14.

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