Light source module, lighting system and lamp

Abstract

A light source module (1), a lighting system and a lamp (D1). The light source module (1) 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), which are electrically independent of each other, wherein light emitted by the light-emitting units is mixed to form white light. By selecting the light colors and spectral features of the light-emitting units, the color temperature coverage of white light obtained by the light source module (1) is wide, and a color deviation Duv value is less than 0.003, thereby alleviating the problem of white light color deviation. In addition, a white light spectrum of the light source module (1) simulates a target spectrum, which is a sunlight spectrum when a relative color temperature is 4000 K or more and is a black-body radiation spectrum when the relative color temperature is below 4000 K. Since the spectrum simulates the sunlight or black-body radiation spectrum, the white light spectrum obtained by the light source module (1) has a good spectral similarity and good color rendering properties, the white light color of the light source module (1) is closer to the color of sunlight, and the light quality performance is obviously superior to that of an existing dual-color-temperature mixed-light white light source; thus, the light source module (1) is more applicable to the field of general 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 202311578609.2 and titled “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 202323178546.X and titled “Light Source Module, Lighting System and Lamp”. The entire contents of the above applications are incorporated by reference into this application. Technical Field

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

[0004] In the lighting sector, light-emitting diodes (LEDs), due to their low power consumption and high luminous efficiency, are rapidly replacing traditional light sources and being applied to various lighting devices, such as indoor and outdoor lighting, smart lighting, plant lighting, automotive lighting, and indoor and outdoor display lighting. As the performance and cost of LED lighting continue to improve, market penetration has also increased. At the same time, users have higher expectations for light quality. In terms of color rendering, the color rendering index has increased from the earliest 70 to 80, 90, and even 95, 97 and above. Spectral trends are gradually moving closer to the natural light spectrum, supplementing or eliminating specific visible light bands to improve their fit with the natural light spectrum. Furthermore, dual-color temperature dimming is being added to achieve lighting scenarios with different color temperature ranges, creating dimming and color-adjusting lighting products that achieve both high light quality and high quality.

[0005] However, the adjustable color temperature range of conventional single- or dual-color-temperature white light dimming methods is limited and determined by the color temperatures of the two white light chips used. Furthermore, because the dimming trajectory is a line connecting the color coordinates of the two color temperatures on the CIE 1931 chromaticity diagram, when adjusted to an intermediate color temperature, the color point differs significantly from the blackbody trajectory, resulting in a significant deviation in light color and spectrum from a standard light source of the same color temperature. Furthermore, the color quality of the intermediate color temperature is also compromised, significantly differing from the full spectrum of a single white light source of the same color temperature, particularly in terms of color rendering indices R9 and R12. Typically, to address the large color deviation problem at intermediate color temperatures, two white light chips with a small color temperature difference can be used for dimming, or the color point specifications of the two white light chips can be adjusted to ensure that when adjusted to the intermediate color temperature, their color points fall within the target value to reduce color deviation. However, these two approaches further reduce the adjustable color temperature range of white light. Alternatively, while maintaining the color quality of the intermediate color temperature, the color effects of the highest and lowest color temperatures are sacrificed. Regardless of the white light spectrum specifications used, even if a full-spectrum white light chip is used, the aforementioned problems of limited adjustable color temperature range and large color deviation leading to reduced light quality persist.

[0006] 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 chip for dimming and color adjustment. This is known as RGBW or RGBCW multi-color mixing. In this mixing approach, when the target color temperature is within the single- or dual-color temperature range, the white light chip primarily participates in the mixing. When the target color temperature exceeds this range, the three primary colors of red, green, and blue (RGB) are mixed or a color compensation method is used to achieve the desired target color temperature. However, regardless of the method used, the color rendering performance of the resulting white light is only guaranteed within the color temperature range covered by the existing white light chip. Outside this range, because the LEDs used for the three primary colors are primarily single-wavelength LED chips, the full-width half-maximum (FWHM) of each color is relatively narrow. This results in poor spectral continuity in the resulting white light, and cannot guarantee a high color rendering index outside the color temperature range of the white light chip.

[0007] As people's living standards improve, the demand for lighting becomes more diversified. How to provide a lighting device that can completely imitate the color temperature changes of outdoor natural light and the light quality comparable to natural light has become an issue that needs to be improved urgently. 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 with adjustable white light color temperature and full spectrum white light.

[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, a third light-emitting unit, and a fourth light-emitting unit that are electrically independent of each other; the first light-emitting unit includes a first light source and a first package body and a first phosphor covering the first light source, and the light emitted by the first light-emitting unit includes at least two spectral emission peaks, the first peak wavelength is located at 445-460nm, the second peak wavelength is located at 480-520nm, and the spectral intensity at the second peak wavelength is 100-150% of the spectral intensity at the first peak wavelength, and the light color is located at A1( The blue-green light in the quadrilateral area surrounded by four points A1 (0.18, 0.39), A2 (0.22, 0.44), A3 (0.25, 0.39), and A4 (0.22, 0.35) is emitted from the second light-emitting unit. ... the blue-green light in 1CIE chromaticity diagram is located in the yellow-orange area of ​​the quadrilateral area surrounded by four points B1 (0.46, 0.47), B2 (0.48, 0.51), B3 (0.53, 0.46), and B4 (0.49, 0.44); the third light-emitting unit includes a third light source, a third package covering the third light source, and a third phosphor, and the light emitted by the third light-emitting unit includes at least two spectral emission peaks, the first peak wavelength is located at 630-680nm, the second peak wavelength is located at 550-580nm, and the spectral intensity at the second peak wavelength is 0-40% of the spectral intensity at the first peak wavelength, and the spectral half width is 70- 100nm, its light color is orange-red light located in a quadrilateral area surrounded by four points C1 (0.60, 0.36), C2 (0.63, 0.37), C3 (0.71, 0.29), and C4 (0.67, 0.29) on the 1931 CIE chromaticity diagram; the fourth light-emitting unit includes a fourth light source and a fourth package covering the fourth light source, and the light output of the fourth light-emitting unit includes at least two spectral emission peaks, the first peak wavelength is located at 430-445nm, the second peak wavelength is located at 460-480nm, and the spectral intensity at the second peak wavelength is 40-80% of the spectral intensity at the first peak wavelength.The present application also provides a lighting system, comprising: a light source and a driving circuit, wherein the light source includes at least one of the above-mentioned light source modules; the driving circuit is electrically connected to the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth 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, the third light-emitting unit, and the fourth light-emitting unit, respectively.

[0010] The present application also provides a lamp, comprising the above-mentioned light source module or the above-mentioned lighting system.

[0011] The light source module, lighting system and lamp provided by the present application, the light source module includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit and a fourth light-emitting unit that are electrically independent of each other, and the light emitted by each light-emitting unit is mixed to form white light. By selecting the light color and spectral characteristics of the light-emitting unit, the white light color temperature obtained by this light source module through mixing has a wide coverage range, ranging from 1800K to 20000K, and its corresponding white light color point distribution trajectory can completely follow the blackbody radiation line, and the color deviation Duv value is less than 0.003, thereby improving the white light color deviation problem. At the same time, the white light spectrum of the light source module simulates the target spectrum. When the relative color temperature is above 4000K, the target spectrum is the daylight spectrum; and when the relative color temperature is lower than 4000K, the target spectrum is the blackbody radiation spectrum. Because the spectrum simulates the spectrum of sunlight or blackbody radiation, the obtained white light spectrum has good spectral similarity and color rendering. The spectral similarity can reach more than 85% in the color temperature range of 2300-20000K, and more than 90% in the color temperature range of 3000-10000K. The overall color temperature range from 1800-20000K can achieve a white light color rendering index greater than 95. Among them, the white light color rendering index in the range of 2300-10000K can reach more than 97, and R1~R15 are all greater than 90. The color fidelity Rf based on the TM-30 standard is greater than 95, and the color saturation Rg is between 100±2. The white light color of this module is closer to daylight, significantly better than the light quality performance of existing dual-color temperature white light sources, and more suitable for general lighting fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of a light source module according to an embodiment of the present application;

[0013] 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;

[0014] 3 is a spectral energy 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;

[0015] FIG4 is a comparison diagram of emission spectrum curves of white light embodiment a emitted by a light source module according to an embodiment of the present application and a standard blackbody radiation light source (B27);

[0016] FIG5 is a comparison diagram of emission spectrum curves of white light embodiment b emitted by a light source module according to an embodiment of the present application and a standard blackbody radiation light source (B30);

[0017] FIG6 is a comparison diagram of emission spectrum curves of white light embodiment c emitted by a light source module according to an embodiment of the present application and a standard D40 light source;

[0018] FIG7 is a comparison diagram of emission spectrum curves of white light embodiment d emitted by a light source module according to an embodiment of the present application and a standard D50 light source;

[0019] FIG8 is a comparison diagram of emission spectrum curves of white light embodiment e emitted by a light source module according to an embodiment of the present application and a standard D57 light source;

[0020] FIG9 is a comparison diagram of emission spectrum curves of white light embodiment f emitted by a light source module according to an embodiment of the present application and a standard D64 light source;

[0021] FIG10 is a comparison diagram of emission spectrum curves of Example g of white light emitted by a light source module according to an embodiment of the present application and a standard blackbody radiation light source;

[0022] FIG11 is a comparison diagram of emission spectrum curves of white light embodiment h emitted by a light source module according to an embodiment of the present application and a standard blackbody radiation light source;

[0023] FIG12 is a comparison diagram of emission spectrum curves of white light embodiment i emitted by a light source module according to an embodiment of the present application and a standard D series light source;

[0024] FIG13 is a comparison diagram of emission spectrum curves of white light embodiment j emitted by a light source module according to an embodiment of the present application and a standard D series light source;

[0025] Figures 14a, 14b, 14c, 14d, 14e, and 14f are schematic diagrams of packaging structures of light source modules according to other embodiments of the present application;

[0026] FIG15 is a schematic structural diagram of a lighting system according to an embodiment of the present application;

[0027] FIG16 is a schematic structural diagram of a lamp according to an embodiment of the present application;

[0028] FIG17 is a schematic structural diagram of a light source module according to another embodiment of the present application. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] The structure of a specific embodiment of the present application 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 a light source 101, 201, 301, 401 and a package 102, 202, 302, 402 covering it. The light source 101, 201, 301, 401 is an LED chip (LED Chip), including either a face-up or flip-up package, 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 provided therein. The plastic bracket can be made of any of PPA, PCT, or EMC. Each light source 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. Each pin 51a, 51b, 52a, 52b, 53a, 53b, 54a, and 54b is electrically isolated from each other. The package 102, 202, 302, and 402 is made of a silicone-based resin, epoxy resin, or a combination thereof. It fills the receiving grooves 61, 62, 63, and 64, respectively, and covers each LED chip 101, 201, 301, and 401 to ensure electrical isolation between the light-emitting units 100, 200, 300, and 400.

[0032] This embodiment utilizes a mixed-light solution with multiple light sources. The first, second, third, and fourth light-emitting units 100, 200, 300, and 400 emit blue-green, yellow-orange, orange-red, and blue light, respectively. The combined light output from each unit forms white light. The first, second, and third light-emitting units 100, 200, and 300 utilize phosphor-excitation technology, where the light source excites the phosphors and then mixes them to form the light output from each unit. The fourth light-emitting unit 400 utilizes a phosphor-free design, as detailed below.

[0033] The fourth light-emitting unit 400 includes a fourth light source 401 and a fourth package 402. The fourth light source 401 is placed at the bottom of the fourth receiving groove 64 and is electrically connected to the outside world via two pins 54a and 54b. The fourth package 402 fills the fourth receiving groove 64 and covers the fourth light source 401.

[0034] The fourth light source 401 is an LED chip combination comprising two or more blue LED chips with different peak wavelengths, connected in series or parallel. The blue LED chips are those that emit blue light with a peak wavelength in the range of 430-475 nm. The reason for selecting a combination of different blue LED chips to form the fourth light source 401 is that 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 no phosphor is incorporated into the fourth light-emitting unit 400, the selection of chips with different peak wavelengths allows for a superposition of the blue light band, even with single-color LED chips having a narrow FWHM. This results in a more uniform energy distribution across the blue light region and improved color rendering. In this embodiment, the difference in peak wavelength between the two LED chips is greater than or equal to 10 nm, ensuring a wider energy distribution across the blue light region. In an alternative solution, blue LED chips with peak wavelengths between 430 and 475 nm are divided into three types: a first blue LED chip with a peak wavelength of 430-445 nm; a second blue LED chip with a peak wavelength of 445-460 nm; and a third blue LED chip with a peak wavelength of 460-475 nm. The difference between the peak wavelengths of any two of these three types is guaranteed to be greater than or equal to 10 nm. The fourth light source 401 includes at least two chips: the first blue LED chip and the third blue LED chip, or a combination of the first, second, and third blue LED chips. Furthermore, since the first, second, and third light-emitting units 100, 200, and 300 are phosphor-excited by blue LED chips, the first, second, and third light sources 101, 201, and 301 are also selected from the first, second, and third blue LED chips. When fourth light source 401 selects two of the above three types, first light source 101, second light source 201, and third light source 301 may select the remaining one. When first light source 101 selects a combination of three types, first light source 101, second light source 201, and third light source 301 may select any one of the three types. In this embodiment, first light source 101 selects a combination of the first blue LED chip and the third blue LED chip, while second light source 201 and third light source 301 select the second blue LED chip.

[0035] The spectral energy distribution of light emitted by the fourth light-emitting unit 400, formed by the blue light chip assembly, is shown as curve 400 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 specific wavelength on the horizontal axis. As can be seen in the figure, curve 400 includes at least two spectral emission peaks: the first peak wavelength P41 is located between 430 and 445 nm, and the second peak wavelength P42 is located between 460 and 480 nm. The spectral intensity at the second peak wavelength P42 is 40% to 80% of the spectral intensity at the first peak wavelength P41.

[0036] The first light-emitting unit 100 includes a first light source 101 and a first package 102. The first light source 101 is placed at the bottom of the first receiving groove 61 and is electrically connected to the outside world via two pins 51a and 51b. The first package 102 fills the first receiving groove 61 and covers the first light source 101. The first light source 101 is a blue LED, emitting blue light with a peak wavelength in the range of 445-460nm. 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 500-580nm. To achieve a wider full width at half maximum (FWHM), the first phosphor 103 contains both blue-green and yellow-green phosphors with different peak wavelengths. Of course, the blue-green and yellow-green phosphors mentioned here are not limited to consisting of only one chemical component; they can each be a mixed phosphor, meaning that more than one phosphor can be mixed to form the desired blue-green and yellow-green phosphors. For blue-green phosphor, you can choose (Ba, Sr)Si2N2O2:Eu. For yellow-green phosphor, you can choose (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 multiple.

[0037] A blue LED chip serving as the first light source 101 is disposed within the receiving groove 61. After its light 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 FIG3 . FIG3 is a relative spectral intensity graph, in which each curve is normalized, with each point on the curve representing the energy level at a particular wavelength on the horizontal axis. As shown in FIG3 , the spectral curve of the light emitted by the first light-emitting unit 100 includes at least two spectral emission peaks, with a first peak wavelength P11 located between 445 and 460 nm and a second peak wavelength P12 located between 480 and 520 nm. The spectral intensity at the second peak wavelength P12 is 100-150% of the spectral intensity at the first peak wavelength P11. The light emitted by the first light-emitting unit 100 is blue-green in color, and is located in the quadrilateral area surrounded by four points A1 (0.18, 0.39), A2 (0.22, 0.44), A3 (0.25, 0.39), and A4 (0.22, 0.35) on the 1931 CIE chromaticity diagram, that is, area A marked in Figure 2.

[0038] The second light-emitting unit 200 includes a second light source 201 and a second package body 202. The second light source 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 body 202 fills the second receiving groove 62 and covers the second light source 201. The second light source 201 is a blue light LED that emits blue light with a peak wavelength in the range of 445-460nm. The second package body 202 contains a second phosphor 203, which includes at least one yellow phosphor with a peak wavelength of 550-580nm and at least one red / orange phosphor with a peak wavelength of 580-620nm. The yellow phosphor can be selected from (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 Any combination of two or more of :Ce. Orange / red phosphors 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+After the second light source 201 excites the second phosphor 203, the light emitted by the second light-emitting unit 200 includes at least two spectral emission peaks. As shown in Figure 3, the first peak wavelength P21 is located between 585 and 620 nm, and the second peak wavelength P22 is located between 550 and 580 nm. The spectral intensity at the second peak wavelength P22 is 40-70% of the spectral intensity at the first peak wavelength P21, and the spectral half-width is 80-120 nm. Its spectral energy distribution is shown as curve 200 in Figure 3. The light emitted by the second light-emitting unit 200 has a yellow-orange color and is located within the quadrilateral area enclosed by four points B1 (0.46, 0.47), B2 (0.48, 0.51), B3 (0.53, 0.46), and B4 (0.49, 0.44) on the 1931 CIE chromaticity diagram, i.e., area B in Figure 2. Because most of the energy emitted by the second light source 201 is converted into yellow-orange light by the second phosphor 203, the blue light content of the light emitted by the second light-emitting unit 200 is less than 10%. The blue light content of less than 10% refers to the fact that the energy in the blue light band of 440-480nm accounts for less than 10% of the total energy of the light emitted by the light-emitting unit.

[0039] The third light-emitting unit 300 includes a third light source 301 and a third package body 302. The third light source 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 light source 301. The third light source 301 is a blue light LED that emits blue light with a peak wavelength in the range of 445-460nm. 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 630-680nm. 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 third phosphor 303 is excited by the third light source 301, the light emitted by the third light-emitting unit 300 includes at least two spectral emission peaks: a first peak wavelength P31 located between 630 and 680 nm, a second peak wavelength P32 located between 550 and 580 nm, and a spectral intensity at the second peak wavelength P32 that is 0-40% of the spectral intensity at the first peak wavelength P31. The spectral half-width is between 70 and 100 nm. Its spectral energy distribution is shown as curve 300 in FIG3 . The light emitted by the third light-emitting unit 300 has an orange-red color and, on the 1931 CIE chromaticity diagram, is located within the quadrilateral region enclosed by points C1 (0.60, 0.36), C2 (0.63, 0.37), C3 (0.71, 0.29), and C4 (0.67, 0.29), i.e., region C in FIG2 . Because most of the energy emitted by the third light source 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 5%. The blue light content of less than 5% refers to the fact that the energy in the blue light band of 440-480nm accounts for less than 5% of the total energy of the light emitted by the light-emitting unit.

[0040] We all know that the three primary colors can be mixed to form white light. In previous solutions, white light is formed by mixing RGB three colors. In this embodiment, the existing RGB solution is optimized and different light colors are selected. The first light-emitting unit 100 emits blue-green light, the second light-emitting unit 200 emits orange-yellow light, the third light-emitting unit 300 emits orange-red light, and the fourth light-emitting unit 400 emits blue crown. When the light emitted by these four is synthesized into white light, full-spectrum white light can be obtained. The full-spectrum white light proposed in this application is achieved by simulating the target spectrum. When the target color temperature is lower than 4000K, the spectrum of the light emitted by the light source module 1 uses the blackbody radiation spectrum as the target spectrum. When the target color temperature is above 4000K, the spectrum of the light emitted by the light source module 1 uses the simulated daylight spectrum as the target spectrum. The daylight spectrum described in this application is the relative spectral power distribution of the D series standard lighting bodies specified by the International Commission on Illumination (CIE), such as D50, D57, D65 standard light sources...etc. In addition, the blackbody radiation spectrum at different color temperatures (T) and the blackbody radiation spectrum (B) conform to the following relationship:

[0041] Where T represents color temperature, h is Planck's constant, c is the speed of light (3x108m / s), K is the Boltzmann constant, TB is the absolute temperature of the black body, and λ is the wavelength of radiation.

[0042] In order to evaluate the degree of match between the simulated white light spectrum obtained in the embodiment and the target spectrum, and since there is currently no relevant evaluation standard issued by an authoritative organization, the spectral matching degree adopted in this application, namely the spectral similarity (SS) evaluation method, is based on the average spectral deviation (ASD) value published by Bridgelux Inc. USA. The spectra of the reference light sources of different color temperatures used in the application are the same as those of the Illuminating Engineering Society of North America. The TM-30 standard is similar to the IES (International Institute of Standards and Technology) published in the United States. Specifically, when the color temperature is above 5000K, the reference spectrum is based on the D-series standard illuminant. When the color temperature is below 4000K, the reference spectrum is based on the spectrum emitted by a blackbody radiation source. For color temperatures between 4000K and 5000K, the reference spectrum is a mixed light source of a 4000K blackbody radiation source and a D50 standard illuminant. Furthermore, considering the wavelength distribution of the human eye's visual sensitivity response, the spectral deviation assessment range is limited to between 425nm and 690nm. The specific calculation method is as follows: SS=1-ASD

[0043] Where φref is the relative intensity of the reference light source, φ is the relative intensity of the light source to be evaluated, and λ is the wavelength.

[0044] By individually dimming the four 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 four 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 several specific embodiments for modulating the duty cycles of the PWM signals of the three light-emitting units under different conditions to obtain a universal white light color temperature range from 2700K to 6500K. Table 1 shows the PWM duty cycles of each light-emitting unit, as well as the actual color temperature, color deviation from blackbody radiation (Duv), spectral similarity, color rendering index (CRI), color fidelity (Rf), color saturation (Rg), and special color rendering indices R1 to R15 of the full-spectrum white light achieved by light source module 1 by modulating the PWM signals of the four light-emitting units.

[0045] Table 1

[0046] Examples a, b, c, d, e, and f in the table correspond to target color temperatures of 2700K, 3000K, 4000K, 5000K, 5700K, and 6500K, respectively. The target color temperature is the color temperature that is desired to be achieved. Due to individual product differences, the actual values ​​at the determined target color temperature may vary slightly. The color temperatures listed in the table are the measured color temperatures for each example. The spectral energy distribution of the full-spectrum white light obtained in each example and the comparison with the target spectrum are shown in Figures 4 to 9. Figure 4 is a comparison of the emission spectrum curves of Example a and a standard blackbody radiation source (B27); Figure 5 is a comparison of the emission spectrum curves of Example b and a standard blackbody radiation source (B30); Figure 6 is a comparison of the emission spectrum curves of Example c and a standard D40 light source; Figure 7 is a comparison of the emission spectrum curves of Example d and a standard D50 light source; Figure 8 is a comparison of the emission spectrum curves of Example e and a standard D57 light source; and Figure 9 is a comparison of the emission spectrum curves of Example f and a standard D65 light source.

[0047] In addition to the data of the embodiments listed in Table 1, the light source module 1 proposed in this application can obtain a white light color temperature that is wider than the universal white light color temperature range. Table 2 lists the embodiment data of the light source module 1 in the two ranges of white light color temperature from 1800K to 2700K and 6500K to 20000K, including the control duty cycle of each channel and the related light quality data.

[0048] Table 2

[0049] The spectral energy distribution of the full-spectrum white light obtained by each embodiment listed in the table and its comparison with the target spectrum are shown in Figures 10 to 13. Figure 10 is a comparison of the emission spectrum curves of embodiment g and a standard blackbody radiation source, Figure 11 is a comparison of the emission spectrum curves of embodiment h and a standard blackbody radiation source; Figure 12 is a comparison of the emission spectrum curves of embodiment i and a standard D-series light source; and Figure 13 is a comparison of the emission spectrum curves of embodiment j and a standard D-series light source.

[0050] As can be seen from Tables 1 and 2, the full-spectrum white light emitted by the mixed light of 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 this embodiment has a wide color temperature coverage range, ranging from 1800-20000K, and the color deviation Duv from the blackbody radiation is less than 0.003, ensuring that the light color of the entire light source module is purer at any color temperature. At the same time, the obtained white light spectrum has a high degree of spectral similarity to the target spectrum. When the white light color temperature emitted by the light source module is between 2300-20000K, the spectral similarity is greater than 85%, among which the spectral similarity is greater than 90% when the white light color temperature is between 3000-10000K. Basically, within the adjustable color temperature range of the light source module, its white light spectrum reaches the level of the full spectrum. Here, we list several existing LED light sources with a relative color temperature of 4000K and calculate their SS values ​​according to the above evaluation method, which are used as reference values ​​for the embodiments of this application. Among them, the spectral similarity of existing conventional Ra80 white light LEDs is 68%, the spectral similarity of conventional Ra90 white light LEDs is 78%, and the spectral similarity of conventional Ra95 white light LEDs is 81%. The spectral similarity of these existing products is significantly lower than that of the light source module 1 proposed in this application. In terms of color rendering, due to its high spectral similarity, the color rendering index CRI of the white light emitted by the light source module is greater than 95 when the color temperature of the white light is between 1800-20000K, and the color rendering index CRI is greater than 97 when the color temperature of the white light is between 2300-10000K, of which R1 to R15 are all greater than 90, and the color fidelity Rf based on the TM-30 standard is greater than 95, and the color saturation Rg is between 100±2. In summary, the light source module 1 has the advantages of a wider color temperature range, high spectral similarity, and good color rendering.

[0051] In the embodiment of FIG1 , a packaging structure of a 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, the first light-emitting unit 100 and the second light-emitting unit 200 can also be packaged independently, while the third light-emitting unit 300 and the fourth light-emitting unit can be packaged independently, which is not limited in this application. There are many packaging structures that can be used for independent packaging. Since the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 have the same structure, we take a light-emitting unit with a similar structure, the first light-emitting unit 100, as an example to illustrate other independent packaging forms. The first light-emitting unit 100 also includes a first light source 101 and a first packaging body 102 covering it, as well as a first phosphor 103. The packaging structure of the embodiments of FIG14a and FIG14b also adopts a bracket structure like the embodiment of FIG1 , and a first accommodating groove 61 is formed on the bracket. FIG14a shows a single light-emitting unit in the light source module 1. After the first light source 101 is placed, it is electrically connected to the outside through the pins 51a and 51b. The first phosphor 103 is first applied to the surface of the first light source 101 by spraying or coating, and then the first receiving groove 61 is filled with the first package 102. In FIG14b, the first receiving groove 61, which has already been placed with the first light source 101, is first filled with the first package 102, and then the first phosphor 103 is applied to the upper surface of the first package 102 by spraying or coating. As mentioned above, we already know that the first phosphor 103 of the first light-emitting unit 100 includes a variety of different phosphors. The difference between the packaging structure of FIG14c and FIG14b is that the different types of phosphors are applied in layers, thus forming a double-layer structure as shown in the figure. Figure 14 illustrates a high-power ceramic package. A ceramic or metal substrate 94 is used. A first light source 101 is mounted on the substrate 94. A first phosphor 103 is applied to the surface of the first light source 101 to form a light conversion layer by spraying, laminating with a fluorescent film, or attaching a fluorescent ceramic sheet. The first package body 102 is then filled and filled to cover the first phosphor 103 and the first light source 101 by injection molding. Figure 14e illustrates a CSP package suitable for high-power chips. A ceramic or metal substrate 94 is used. After the first phosphor 103 and the first package body 102 are mixed, a light conversion layer is formed on the surface of the first light source 101 by laminating with a fluorescent film. Figure 14f has a similar structure to Figure 14e. Also using a ceramic or metal substrate 94, a first phosphor 103 is applied to the surface of the first light source 101 to form a light conversion layer by spraying or laminating with a fluorescent film. The first package body 102 is then mounted on the outer surface of the first phosphor 103 to complete the package. All of the above methods can achieve the objectives of this application and are not intended to be limiting.

[0052] Another embodiment of the light source module of the present application is shown in FIG17 , and 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 aforementioned embodiment and will not be further described here.

[0053] 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.

[0054] Another embodiment of the present application is a lighting system as shown in FIG15 , which includes the light source module 1 and the driving circuit 2 in the above embodiment.

[0055] 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 driving current / voltage required by each light-emitting unit after adjustment 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 FIG15 , 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 .

[0056] As mentioned above, the color temperature of the light source module 1 of the embodiment is adjustable in the range of 1800-14000K, and it is necessary to simulate the target spectrum. Therefore, the control module 22 includes a storage module, which 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, and the third light-emitting unit 300 when the light source module 1 produces 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 a command, reads the relevant value in the storage module, forms a control signal and sends it to the LED driver module 23, adjusts the current / voltage output to the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300, 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 parameter is the duty cycle of the PWM signal of each light-emitting unit as shown in Table 1 and Table 2. Because light source module 1 selects light-emitting units of specific colors and controls them according to preset parameters, the resulting full-spectrum white light has a wider color temperature range than the white light obtained by mixing light using existing technologies, ranging from 1800-20000K. The color deviation Duv from blackbody radiation is less than 0.003, ensuring that the light color of the entire light source module is purer at any color temperature. Furthermore, the obtained white light spectrum has a high degree of spectral similarity to the target spectrum. When the color temperature of the white light emitted by the light source module is between 2300-20000K, the spectral similarity is greater than 85%. Specifically, the spectral similarity is greater than 90% when the color temperature of the white light is between 3000-10000K. Essentially, within the adjustable color temperature range of the light source module, its white light spectrum reaches full spectrum levels. In terms of color rendering, thanks to its high spectral similarity, the light source module emits white light with a CRI greater than 95 for temperatures between 1800 and 20,000 Kelvin (Colour Rendering Index), and greater than 97 for temperatures between 2300 and 10,000 Kelvin (Colour Rendering Index). R1 ​​through R15 are all greater than 90, and the colour fidelity Rf based on the TM-30 standard is greater than 95, with colour saturation Rg between 100 ± 2. In summary, light source module 1 offers the advantages of a wide colour temperature range, high spectral similarity, and excellent colour rendering.

[0057] The above-mentioned light source module and lighting system can be applied to various types of lamps. Figure 16 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 provided on the light source board 85, and a power box 87. The aforementioned drive circuit 2 is provided 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 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.

[0058] 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, a third light emitting unit, and a fourth light emitting unit which are electrically independent of each other; The first light-emitting unit includes a first light source, a first package covering the first light source, and a first phosphor, wherein the light emitted by the first light-emitting unit includes at least two spectral emission peaks, a first peak wavelength is located at 445-460 nm, a second peak wavelength is located at 480-520 nm, and the spectral intensity at the second peak wavelength is 100-150% of the spectral intensity at the first peak wavelength, and the light color is blue-green light located in a quadrilateral area surrounded by four points A1 (0.18, 0.39), A2 (0.22, 0.44), A3 (0.25, 0.39), and A4 (0.22, 0.35) on the 1931 CIE chromaticity diagram; The second light-emitting unit includes a second light source, a second package covering the second light source, and a second phosphor, the light emitted by the second light-emitting unit includes at least two spectral emission peaks, the first peak wavelength is located at 585-620nm, the second peak wavelength is located at 550-580nm, the spectral intensity at the second peak wavelength is 40-70% of the spectral intensity at the first peak wavelength, the spectral half width is 80-120nm, and the light color is yellow-orange light located in a quadrilateral area surrounded by four points B1 (0.46, 0.47), B2 (0.48, 0.51), B3 (0.53, 0.46), and B4 (0.49, 0.44) on the 1931 CIE chromaticity diagram; The third light-emitting unit includes a third light source, a third package covering the third light source, and a third phosphor. The light emitted by the third light-emitting unit includes at least two spectral emission peaks, a first peak wavelength is located at 630-680nm, a second peak wavelength is located at 550-580nm, and the spectral intensity at the second peak wavelength is 0-40% of the spectral intensity at the first peak wavelength. The spectral half width is 70-100nm, and the light color is orange-red light located in a quadrilateral area surrounded by four points C1 (0.60, 0.36), C2 (0.63, 0.37), C3 (0.71, 0.29), and C4 (0.67, 0.29) on the 1931 CIE chromaticity diagram; The fourth light-emitting unit includes a fourth light source and a fourth package covering the fourth light source. The light emitted by the fourth light-emitting unit includes at least two spectral emission peaks, a first peak wavelength is located at 430-445nm, a second peak wavelength is located at 460-480nm, and the spectral intensity at the second peak wavelength is 40-80% of the spectral intensity at the first peak wavelength.

2. The light source module according to claim 1, wherein: The blue light content of the second light emitting unit is less than 10%, and the blue light content of the third light emitting unit is less than 5%.

3. The light source module according to claim 1, wherein: The fourth light source is an LED chip combination, comprising two or more blue light LED chips with different peak wavelengths, the peak wavelength of the blue light LED chip is 430-475nm, and the peak wavelength difference between the two or more blue light LED chips with different peak wavelengths is greater than or equal to 10nm.

4. The light source module according to claim 3, wherein: The first blue light LED chip has a peak wavelength of 430-445nm; the second blue light LED chip has a peak wavelength of 445-460nm; the third blue light LED chip has a peak wavelength of 460-475nm, and the difference in peak wavelengths between any two of the first blue light LED chip, the second blue light LED chip, and the third blue light LED chip is greater than or equal to 10nm. The fourth light source includes the first blue light LED chip and the third blue light LED chip, and the first light source, the second light source, and the third light source are the second blue light LED chip.

5. 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 500-580 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; 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+ .

6. The light source module according to claim 1, wherein: The second phosphor includes at least one yellow phosphor with a peak wavelength of 550-580 nm and at least one red / orange phosphor with a peak wavelength of 580-620 nm. The yellow phosphor is (Lu, Yb, Tb)3(Al, Ga)5O 12 :Ce, Ga-Y3Al5O 12 :Ce、Y3(Al,Ga)5O 12 :Ce; 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+ .

7. 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 630-680 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+ .

8. The light source module according to claim 1, wherein: The color temperature of white light formed by the mixture of the light emitted by the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is adjustable within the range of 1800-20000K, and the color deviation Duv from the blackbody radiation is less than 0.003, and the color rendering index CRI is greater than 95.

9. The light source module according to claim 8, wherein: The white light formed by the mixed light of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit has a color rendering index CRI greater than 97 within the color temperature range of 2300-10000K, wherein R1 to R15 are all greater than 90, and the color fidelity Rf based on the TM-30 standard is greater than 95, and the color saturation Rg is between 100±2.

10. The light source module according to claim 8, wherein: The white light simulated target spectrum formed by the mixture of the light emitted by the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit has a similarity with the target spectrum greater than 85% within the color temperature range of 2300-20000K. When the relative color temperature is above 4000K, the target spectrum is a daylight spectrum; when the relative color temperature is lower than 4000K, the target spectrum is a blackbody radiation spectrum.

11. The light source module according to claim 10, wherein: The white light formed by mixing the light emitted by the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit simulates the target spectrum, and has a similarity of more than 90% to the target spectrum within the color temperature range of 3000-10000K.

12. The light source module according to claim 1, wherein: The light source module is a packaged chip, which includes a main body, on which a first receiving groove, a second receiving groove, a third receiving groove and a fourth receiving groove are arranged, the first light source and the first phosphor are arranged in the first receiving groove, the second light source and the second phosphor are arranged in the second receiving groove, the third light source and the third phosphor are arranged in the third receiving groove, and the fourth light source is arranged in the fourth receiving groove. The first packaging body, the second packaging body, the third packaging body and the fourth packaging body fill the first receiving groove, the second receiving groove, the third receiving groove and the fourth receiving groove respectively, and the first packaging body, the second packaging body, the third packaging body and the fourth packaging body cover the first light source, the second light source, the third light source and the fourth light source respectively.

13. The light source module according to claim 1, 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 respectively 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.

14. A lighting system comprising: 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, the third light-emitting unit, and the fourth light-emitting unit, respectively, and supplies power to them. The driving circuit controls the current / voltage provided to the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit, respectively.

15. A lamp, comprising the light source module according to any one of claims 1 to 13, or comprising the lighting system according to claim 14.

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