Light source module, lighting device and light mixing method thereof

Abstract

The application provides a light source module, a lighting device and a light mixing method thereof. The light source module comprises a first light emitting unit, a second light emitting unit and a third light emitting unit. In the CIE1931 color space, the first light emitting unit is located in a quadrilateral region surrounded by (0.665, 0.308), (0.681, 0.318), (0.578, 0.415) and (0.558, 0.386); the second light emitting unit is located in a quadrilateral region surrounded by (0.15, 0.115), (0.165, 0.125), (0.177, 0.212) and (0.15, 0.2); and the third light emitting unit is located in a quadrilateral region surrounded by (0.372, 0.57), (0.42, 0.54), (0.375, 0.45) and (0.33, 0.455). The application defines a new three-primary-color light source module, and realizes high-quality white light and dynamic spectrum with a wide color gamut.

Description

Technical Field

[0001] This invention relates to the field of LED lighting technology, specifically to a light source module, a lighting device, and a light mixing method thereof. Background Technology

[0002] An LED light is a solid-state semiconductor device that converts electrical energy into visible light. It uses a light-emitting diode as its light source, directly converting electrical energy into light energy. Different types of LEDs can emit light of various colors and wavelengths. Due to their advantages of high brightness, low energy consumption, environmental friendliness, long lifespan, impact resistance, and stable performance, LED lights have been widely used in the lighting industry.

[0003] With the development of the times and social progress, people have put forward more and higher demands for LED lighting fixtures, such as the need for healthy lighting and dimming / color adjustment. Generally, when it comes to dimming / color adjustment, there are two common solutions: one is to use the three primary colors of red, green, and blue (RGB), and the other is to use the four primary colors of red, green, blue, and white (RGBW). Although these two solutions can achieve a certain range of dimming and color adjustment, neither of them can guarantee a sufficient color rendering index. In addition, these two solutions cannot meet the needs of healthy lighting. Therefore, it is necessary to propose a new solution to achieve dimming and color adjustment with a high color rendering index while also meeting the needs of healthy lighting.

[0004] To better understand the technical solution of this invention, some optical concepts are explained below.

[0005] Melanopic Ratio (hereinafter referred to as MR)

[0006] Photopic vision refers to our ability to see objects during the day and in well-lit spaces; that is, the effect of light on vision. The Melanopic Ratio (MR, Melanopic / Photopic ratio) quantifies the effect of light on circadian rhythms: the degree to which a light source stimulates the human circadian rhythm system. The higher the MR ratio, the stronger the circadian rhythm effect of the light source, and the more it promotes alertness and wakefulness.

[0007] like Figure 1 As shown, Figure 1 These are the response curves for human photopic and melanopic vision, with the peak representing the eye's peak response to light. Visually, the human eye reacts most strongly to green or yellowish-green light; biologically, blue light elicits the strongest response, inhibiting melatonin production and promoting wakefulness.

[0008] The MR value can be calculated using the following formula:

[0009]

[0010] In the formula:

[0011] (1) P(λ) is the spectral power distribution of the light source;

[0012] (2) M(λ) is a normalized melatonin weighting function centered at 490nm;

[0013] (3) V(λ) is a normalized light-view weighting function centered at 555nm;

[0014] (4) K = 1.219 is the conversion factor between black-vision and photo-vision responses, converting irradiance into lux.

[0015] Correlated Color Temperature (CCT)

[0016] Correlated color temperature (CCT, also known as color temperature) is a numerical method for characterizing the color appearance of any white light source. Artificial white light can be composed of combinations of colors from the visible spectrum; different proportions of wavelengths result in the light appearing "cooler" (blue / cyan wavelengths) or "warmer" (yellow / orange wavelengths). The CCT of a light source is the point on the Planck locus that most closely (perceptually) matches the chromaticity coordinates of that light source. If the light source is not a blackbody radiation source, but its chromaticity coordinates are close to the Planck locus, we can use CCT to characterize its color. CCT is measured in Kelvin (K): warm light is approximately 2700K, neutral white is approximately 4000K, and cool white is approximately 5000K or higher.

[0017] Ra refers to the average color rendering index, which is the average value of 15 color samples (R1-R15). (In this article, both color rendering index and color rendering index refer to Ra).

[0018] R9, while the Color Rendering Index (CRI) measures how accurately a light source illuminates (renders) the colors of objects, with high-quality LEDs having a CRI range of 80 or higher. Although CRI is a number, it represents the average performance score of a light source when rendering a set of standardized color samples. Traditional CRI uses 8 core samples and 7 supplementary samples, each called Rx. R9, a deep red, is often referenced as a key color quality indicator in many applications. Summary of the Invention

[0019] The purpose of this invention is to provide a new three-primary-color light source module, thereby meeting the dimming and color adjustment requirements of high color rendering index and the requirements of healthy lighting.

[0020] To achieve this objective, the present invention provides a light source module comprising:

[0021] The first light-emitting unit emits red and white light with a peak wavelength between 630nm and 650nm. The red and white light is located in the quadrilateral region enclosed by (0.665, 0.308), (0.681, 0.318), (0.578, 0.415), and (0.558, 0.386) in the CIE1931 color space.

[0022] The second light-emitting unit emits sky blue light with a peak wavelength between 455nm and 465nm. In the CIE 1931 color space, the sky blue light is located in the quadrilateral region enclosed by (0.15, 0.115), (0.165, 0.125), (0.177, 0.212), and (0.15, 0.2).

[0023] The third light-emitting unit emits pale green light with a peak wavelength between 530nm and 550nm. In the CIE 1931 color space, the pale green light is located in the quadrilateral region enclosed by (0.372, 0.57), (0.42, 0.54), (0.375, 0.45), and (0.33, 0.455).

[0024] At least one of the first, second, and third light-emitting units emits light, and the light emitted by each light-emitting unit in the light source module is mixed to obtain the emitted light.

[0025] Preferably, the first light-emitting unit includes a first light-emitting element and a first phosphor. The first light-emitting element emits blue light with a peak wavelength in the range of 445nm to 465nm. The first phosphor includes at least one red phosphor. When the red phosphor is excited by the first light-emitting element, it emits red light with a peak wavelength of 600nm to 650nm and a full width at half maximum (FWHM) of 60nm to 100nm.

[0026] Preferably, the first phosphor further includes at least one yellow-green phosphor, which emits yellow-green light with a peak wavelength of 520 nm to 550 nm and a full width at half maximum (FWHM) of 90 nm to 120 nm after being excited by the first light-emitting element.

[0027] Preferably, the red and white light has a first peak in the range of 630nm to 650nm and a second peak in the range of 520nm to 550nm, and the intensity ratio of the second peak to the first peak is less than 15%.

[0028] Preferably, the spectral energy of red and white light with wavelengths between 630 nm and 650 nm accounts for 20% to 30% of the total energy.

[0029] Preferably, the second light-emitting unit includes a second light-emitting element and a second phosphor. The second light-emitting element emits blue light with a peak wavelength in the range of 445nm to 465nm. The second phosphor includes at least one cyan phosphor. When the second light-emitting element is excited, the cyan phosphor emits cyan light with a peak wavelength of 480nm to 500nm and a full width at half maximum (FWHM) of 70nm to 90nm.

[0030] Preferably, the sky-blue light has a peak wavelength of 455 nm to 465 nm, and the spectral energy in the range of 480 nm to 500 nm accounts for 15% to 30% of the total energy.

[0031] Preferably, the third light-emitting unit includes a third light-emitting element and a third phosphor. The third light-emitting element emits blue light with a peak wavelength in the range of 445nm to 465nm. The third phosphor includes at least one yellow-green phosphor. When the yellow-green phosphor is excited by the third light-emitting element, it emits yellow-green light with a peak wavelength of 520nm to 550nm and a full width at half maximum (FWHM) of 90nm to 120nm.

[0032] Preferably, the light source module includes a body, on which a first receiving cavity, a second receiving cavity, and a third receiving cavity are provided. A first light-emitting unit is disposed in the first receiving cavity, a second light-emitting unit is disposed in the second receiving cavity, and a third light-emitting unit is disposed in the third receiving cavity. Each of the first, second, and third receiving cavities is provided with an encapsulation body, and each light-emitting unit is provided with a pair of electrode structures.

[0033] The present invention also provides a lighting device, including the above-mentioned light source module and a control unit; the control unit is electrically connected to the first light-emitting unit, the second light-emitting unit and the third light-emitting unit respectively.

[0034] Preferably, the control unit includes

[0035] The power module converts external AC power into DC power.

[0036] The control module sends control signals;

[0037] The drive module receives DC power output from the power supply module and control signals sent by the control module. The drive module is electrically connected to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit, and outputs corresponding drive current to each light-emitting unit.

[0038] Preferably, the control unit further includes a data acquisition module, which detects the current signals collected by the sampling resistors of each light-emitting unit and sends the collected signals to the control module. The control module adjusts the control signals according to the signals collected by the data acquisition module.

[0039] The present invention also provides a light mixing method, which performs light mixing in a triangular region with vertices (0.5949, 0.3925), (0.1603, 0.1870), and (0.3761, 0.4774) in the CIE1931 color space.

[0040] Preferably, the emitted light is white light, and the correlated color temperature of the white light is between 1450K and 18000K, with an average color rendering index greater than 80 and a color deviation (Duv) from the blackbody radiation less than 0.002.

[0041] Preferably, the white light has an average color rendering index greater than 90 when the correlated color temperature is between 1800K and 7500K.

[0042] The present invention also provides another light mixing method, which performs light mixing in a triangular region with vertices (0.6511,0.3435), (0.1599,0.1501), and (0.3929,0.5099) in the CIE1931 color space.

[0043] Preferably, the emitted light is white light, and the correlated color temperature of the white light is between 1200K and 60000K, with an average color rendering index greater than 80 and a color deviation (Duv) from the blackbody radiation less than 0.002.

[0044] Preferably, the white light has an average color rendering index greater than 90 when the correlated color temperature is between 1800K and 30000K.

[0045] This invention defines a novel three-primary-color light source module, based on red-white light (LR) from the first light-emitting unit, sky-blue light (LB) from the second light-emitting unit, and pale green light (LG) from the third light-emitting unit, to achieve high-quality white light with a wide color gamut, a color rendering index (CRI) of over 90 in the 1800K-7500K range, and even a CRI of over 90 in the 1800K-30000K range; it truly achieves dynamic spectrum, maintaining excellent color rendering adjustment along the blackbody curve in the range of 1600K to 60000K. Attached Figure Description

[0046] Figure 1 These are the response curves for human photopic and melanopic vision.

[0047] Figure 2 This is a schematic diagram of the structure of one embodiment of the light source module of the present invention.

[0048] Figure 3 This is a color point distribution diagram of each light-emitting unit of the light source module of the present invention in the CIE1931 color space.

[0049] Figure 4 This is a spectral energy distribution diagram of an embodiment of the first light-emitting unit of the present invention.

[0050] Figure 5 This is a spectral energy distribution diagram of an embodiment of the second light-emitting unit of the present invention.

[0051] Figure 6 This is a diagram showing the color point distribution of schemes 1-3 in the CIE1931 color space.

[0052] Figure 7 This is the spectral energy distribution diagram of Scheme 1.

[0053] Figure 8 This is the spectral energy distribution diagram of Scheme 2.

[0054] Figure 9 This is a schematic diagram of the structure of one embodiment of the lighting device of the present invention.

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0056] To facilitate understanding of the present invention, a more comprehensive description will be given below in conjunction with the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0059] In this invention, unless otherwise specified, "nm" refers to the wavelength of light.

[0060] In a specific embodiment of the present invention, the light source / light source module of the present invention is a light-mixing LED packaged chip, and its packaging form can be PLCC surface mount package, ceramic surface mount package, CSP package, COB chip integrated package, etc. The packaging form is not the focus of the present invention, so this application does not specifically limit the packaging form. Those skilled in the art can choose the appropriate packaging form according to the actual situation.

[0061] Light source module embodiment

[0062] See Figure 2 , Figure 2 A schematic diagram of an embodiment of the light source module of the present invention is provided. In this embodiment, the light source module includes a first light-emitting unit 10, a second light-emitting unit 20, and a third light-emitting unit 30. The first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 are electrically independent of each other. The first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 are respectively connected to a control module (…). Figure 2 Electrical connection (not shown). At least one of the first light-emitting unit 10, the second light-emitting unit 20 and the third light-emitting unit 30 emits light, and the light emitted by each light-emitting unit (at least one of the first light-emitting unit 10, the second light-emitting unit 20 and the third light-emitting unit 30) is mixed to obtain the emitted light of the light source module 100.

[0063] In this embodiment, the light source module includes a body 100, and a first light-emitting unit 10, a second light-emitting unit 20, and a third light-emitting unit 30 are spaced apart on the body 100. The first light-emitting unit 10 includes a first light-emitting element 11 and a first phosphor. The first light-emitting element 11 is configured with a pair of electrode structures 11a and 11b. The first phosphor includes red phosphor 12 (red phosphor) and yellow-green phosphor 13 (green phosphor). The second light-emitting unit 20 includes a second light-emitting element 21 and a second phosphor 22. The second light-emitting element 21 is configured with a pair of electrode structures 21a and 21b, and the second phosphor 22 is cyan phosphor 22 (cyan phosphor). The third light-emitting unit 30 includes a third light-emitting element 31 and a third phosphor 32. The third light-emitting element 31 is configured with a pair of electrode structures 31a and 31b, and the third phosphor 32 is yellow-yellow-green phosphor 32 (yellow-green phosphor). The first light-emitting element 11, the second light-emitting element 21, and the third light-emitting element 31 are all blue LEDs, emitting blue light with a peak wavelength in the range of 445nm to 465nm. Electrode structures 11a, 11b, 21a, 21b, 31a, and 31b are insulated from each other.

[0064] The main body 100 is provided with a first receiving cavity 101, a second receiving cavity 102, and a third receiving cavity 103. A first light-emitting element 11 and a first phosphor are disposed in the first receiving cavity 101, a second light-emitting element 21 and a second phosphor 22 are disposed in the second receiving cavity 102, and a third light-emitting element 31 and a third phosphor 32 are disposed in the third receiving cavity 103. Each of the first receiving cavity 101, the second receiving cavity 102, and the third receiving cavity 103 is provided with an encapsulation body 104. The encapsulation body 104 is formed of a light-transmitting resin, which includes one or more combinations of epoxy resin, silicone resin, polyurethane, polymethyl methacrylate, and polycarbonate. The light-transmitting resin has the function of transmitting and mixing light. The encapsulation body 104 also ensures electrical isolation between the light-emitting units 10, 20, and 30.

[0065] See Figure 3 , Figure 3 The region range of each light-emitting unit of the light source module 100 in the CIE 1931 color space is shown, wherein: the first light-emitting unit is located in the LR1LR2LR3LR4 region: LR1(0.665, 0.308), LR2(0.681, 0.318), LR3(0.578, 0.415), LR4(0.558, 0.386); the second light-emitting unit is located in the LB1LB2LB3LB4 region: LB1(0.15, 0.115), LB2(0.165, 0.125), LB3(0.177, 0.212), LB4(0.15, 0.2); the third light-emitting unit is located in the LG1LG2LG3LG4 region: LG1(0.372, 0.57), LG2(0.42, 0.54), LG3(0.375, 0.45), LG4(0.33, 0.455).

[0066] See Figure 4 , Figure 4 This is a spectral energy distribution diagram of an embodiment of the first light-emitting unit of the present invention. Its spectrum has three peaks at 455nm, 540nm and 635nm, with energy ratios of 0.9%, 14.5% and 100%, respectively. The intensity ratio of the second peak to the first peak is 14.5%. The spectral energy in the wavelength range of 630nm to 650nm accounts for 20% to 30% of the total energy.

[0067] See Figure 5 , Figure 5 This is a spectral energy distribution diagram of an embodiment of the second light-emitting unit of the present invention, wherein the spectrum has a peak wavelength in the range of 455nm to 465nm, and the spectral energy in the range of 480nm to 500nm accounts for 15% to 30% of the total energy.

[0068] This invention defines a new three-primary-color mixing scheme: red-white light (LR, based on the first light-emitting unit), sky blue light (LB, based on the second light-emitting unit), and light green light (LG, based on the third light-emitting unit). The scheme of this invention can realize new functions of healthy lighting.

[0069] To investigate the effect of phosphor on light mixing, we designed several schemes, as follows.

[0070] Table 1

[0071]

[0072] Table 2

[0073]

[0074]

[0075] Table 3

[0076]

[0077] Table 4

[0078]

[0079]

[0080] Table 5

[0081]

[0082] Table 6

[0083]

[0084]

[0085] Table 7

[0086]

[0087] Table 8

[0088]

[0089] Table 9

[0090]

[0091]

[0092] By comparing the data in Tables 1, 2, and 3 (i.e., schemes 1, 11, and 12), we found the results in Table 10.

[0093] Table 10

[0094]

[0095] By comparing the data from Tables 1, 2, 3, and 10, it can be seen that the peak value of the cyan phosphor (i.e., the peak wavelength of the light emitted by the phosphor after being excited by the LED) affects the light mixing as follows:

[0096] The higher the peak value of the cyan powder, the better the performance of the Ra color index. Taking a color index of 90 as an example, a cyan powder peak value of 495nm can make the white light range reach 1800K-10000K; similarly, R9 will also perform better in the high color temperature range.

[0097] However, the higher the cyan peak value, the lower the MR performance, especially in the high color temperature range, where the MR decreases even more.

[0098] For healthy lighting, Option 1 offers a more balanced white light performance and physiological performance, meeting the requirements: a color rendering index of over 90 in the range of 1800K to 7500K, while maintaining good MR performance. Therefore, a peak cyan phosphor with a wavelength of 480 to 485nm is preferred.

[0099] If MR performance is not considered, the 495nm peak cyan powder is preferred, as it has better white light performance, achieving a CRI of over 90 from 1800K to 10000K and over 80 from 1600K to 60000K.

[0100] By comparing the data in Tables 1, 4, and 5 (i.e., schemes 1, 13, and 14), we found the results in Table 11.

[0101] Table 11

[0102]

[0103] By comparing the data from LG using Tables 1, 4, 5, and 11, the effects of the peak value of the yellow-green phosphor (yellow-green phosphor) on light mixing can be observed as follows:

[0104] Option 13: The 530nm peak yellow-green powder, when mixed, produces white light with excellent MR performance above 3500K, and the MR value below 3500K is slightly higher than the other two options; however, the white light obtained by mixing has the worst color rendering index performance, only reaching a color rendering index of 90 or above in the range of 3000K-5000K.

[0105] Option 14: The 545nm peak yellow-green phosphor produces the best color rendering index for white light obtained by mixing, reaching Ra90 or higher in the 1650-8500K range, but the MR value is relatively low.

[0106] Taking into account both the white light color rendering index performance and MR performance obtained by light mixing, the 540nm yellow-green powder is preferred.

[0107] If MR performance is not considered, yellow-green powder with a peak value of around 545nm is preferred, as it has better color rendering performance.

[0108] By comparing the data in Tables 1, 6, and 7 (i.e., schemes 1, 15, and 16), we found the results in Table 12.

[0109] Table 12

[0110]

[0111] By comparing the LR data in Tables 1, 6, 7, and 12, the influence of the peak value of the red phosphor (red phosphor) on the light mixing results are as follows:

[0112] Changes in the red powder peak value have little effect on MR.

[0113] The 645nm peak red light has poor color rendering index performance in the white light obtained by mixing, with a narrow range of color rendering index above 90, only 3500K-5700K.

[0114] From a general lighting perspective, the white light obtained by mixing red and pink light at a peak of 635nm has a more balanced color rendering index, with a color rendering index of over 90 at 1800K.

[0115] Taking all factors into account, the 635nm peak red light is superior.

[0116] By comparing the data in Tables 1, 8, and 9 (i.e., schemes 1, 2, and 3), we found the results in Table 13.

[0117] Table 13

[0118] Ra 70 and above Ra 80 and above Ra 90 and above Ra 95 and above Option 1 1450K to 60000K 1450K to 18000K 1800K to 7500K 3500K to 5000K Option 2 1100K to 60000K 1200K to 60000K 1800K to 30000K 2750K to 8000K Option 3 1050K to 60000K 1150K to 60000K 2000K to 60000K 3500K to 7500K

[0119] See the color point distribution diagrams for Schemes 1-3 in the CIE 1931 color space. Figure 6 .

[0120] Combination Figure 4 As can be seen from Table 13, if MR performance is not considered, the larger the triangular area, such as Scheme 3, the better the performance of the ultra-wide color gamut white light color rendering index, such as the range of 90.

[0121] The smaller the triangular area of ​​the solution, the better the MR of the ultra-wide color gamut white light can promote circadian rhythm health. For example, in solution 1, the MR is lower at low color temperatures (1600K-2750K) and higher at high color temperatures (3500K-60000K). From a lighting perspective, the white light performance of solution 1 is sufficient to meet the requirements, with a CRI of over 90 in the range of 1800K to 7500K.

[0122] Taking all factors into consideration, Option 1 is the preferred option, meeting the requirements for healthy lighting: the color rendering index and MR performance of ultra-wide color gamut white light are excellent.

[0123] MR performance is not a priority; Option 2 is the preferred option, offering excellent white light rendering index for an ultra-wide color gamut.

[0124] See the spectral energy distribution diagram of Scheme 1. Figure 7 See the spectral energy distribution diagram for Scheme 2. Figure 8 .

[0125] lighting fixtures

[0126] The present invention also provides a lighting device, such as... Figure 9 As shown, the lighting device includes a light source module and a control unit as described in the above embodiments. The control unit includes a power module 40, a control module 50, a drive module 60, and a data acquisition module 70.

[0127] The power module 40 converts external AC power into DC power required by the control module 50 and the drive module 60.

[0128] The control module 50 sends control signals, such as wired or wireless dimming signals, to the drive module based on the received external adjustment signals.

[0129] The drive module 60 receives the DC power output from the power supply module 40 and the control signal sent by the control module 50. The drive module 60 is electrically connected to the first light-emitting unit 10, the second light-emitting unit 20 and the third light-emitting unit 30 respectively, and outputs the corresponding drive current to each light-emitting unit 10, 20 and 30.

[0130] The acquisition module 70 detects the current signals collected by the sampling resistors of each light-emitting unit 10, 20, and 30, and sends the collected signals to the control module 50. The control module 50 adjusts the control signal according to the signals collected by the acquisition module 70.

[0131] The color temperature of the light source module embodiment of the present invention is adjustable. As mentioned above, the adjustment range is preset to 1450K-18000K. The control module 50 has a storage module that stores preset control parameters (such as color temperature range). Based on the color temperature requirements of the light source module's mixing, the control parameters correspond to the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30. Control parameters can be, for example, voltage values, current values, PWM signals, etc. If a light-emitting unit does not participate in light mixing, its control parameter is 0. When the control module 50 receives a color temperature change command, it reads the control parameters from the storage module, forms a control signal, and sends it to the drive module 60. The drive module 60 outputs corresponding currents to the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 according to the control signal, causing the light source module to emit white light of the corresponding color temperature. The acquisition module 70 detects the current signals collected by the sampling resistors of each light-emitting unit 10, 20, and 30, and feeds the collected current signals back to the control module 50. If the collected current signal is inconsistent with the current signal required by the control parameters, the control module 50 sends a control signal to the drive module 60. The drive module 60 adjusts the control parameters for the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, thereby ensuring that the current of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 meets the requirements of the mixed light color temperature.

[0132] It can be seen that the control module 50, the drive module 60, and the sampling module 70 form a closed-loop control circuit to accurately control the current of each light-emitting unit 10, 20, and 30.

[0133] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A light source module, characterized by comprises: a first light emitting unit emitting red-white light with a peak wavelength of 630-650 nm, the red-white light having a first wave peak in the range of 630-650 nm, a second wave peak in the range of 520-550 nm, an intensity ratio of the second wave peak / the first wave peak less than 15%, the red-white light having a spectral energy at a wavelength of 630-650 nm accounting for 20-30% of the total energy, and the red-white light being located in a quadrilateral region enclosed by (0.665, 0.308), (0.681, 0.318), (0.578, 0.415) and (0.558, 0.386) in a CIE1931 color space; a second light emitting unit emitting sky blue light with a peak wavelength of 455-465 nm, the sky blue light having a peak wavelength of 455-465 nm and a spectral energy in the range of 480-500 nm accounting for 15-30% of the total energy, and the sky blue light being located in a quadrilateral region enclosed by (0.15, 0.115), (0.165, 0.125), (0.177, 0.212) and (0.15, 0.2) in the CIE1931 color space; a third light emitting unit emitting light green light with a peak wavelength of 530-550 nm, and the light green light being located in a quadrilateral region enclosed by (0.372, 0.57), (0.42, 0.54), (0.375, 0.45) and (0.33, 0.455) in the CIE1931 color space; the first light emitting unit, the second light emitting unit and the third light emitting unit emit light simultaneously, and the light emitted by each light emitting unit in the light source module is mixed to obtain outgoing light.

2. The light source module according to claim 1, wherein: the first light emitting unit comprises a first light emitting element and a first phosphor, the first light emitting element emits blue light with a peak wavelength in the range of 445-465 nm, and the first phosphor comprises at least one red phosphor, the red phosphor being excited by the first light emitting element to emit red light with a peak wavelength of 600-650 nm and a full width at half maximum of 60-100 nm.

3. The light source module according to claim 2, wherein: the first phosphor further comprises at least one yellow-green phosphor, the yellow-green phosphor being excited by the first light emitting element to emit yellow-green light with a peak wavelength of 520-550 nm and a full width at half maximum of 90-120 nm.

4. The light source module according to claim 1, wherein: The second light emitting unit comprises a second light emitting element and a second phosphor, the second light emitting element emits blue light with a peak wavelength in the range of 445nm to 465nm, and the second phosphor comprises at least one cyan phosphor, the cyan phosphor emits cyan light with a peak wavelength of 480nm to 500nm and a full width at half maximum of 70nm to 90nm after being excited by the second light emitting element.

5. The light source module of claim 1, wherein: The third light emitting unit comprises a third light emitting element and a third phosphor, the third light emitting element emits blue light with a peak wavelength in the range of 445nm to 465nm, and the third phosphor comprises at least one yellowish green phosphor, the yellowish green phosphor emits yellowish green light with a peak wavelength of 520nm to 550nm and a full width at half maximum of 90nm to 120nm after being excited by the third light emitting element.

6. The light source module of any one of claims 1 to 5, wherein: The light source module comprises a body, the body is provided with a first accommodating cavity, a second accommodating cavity and a third accommodating cavity, the first light emitting unit is arranged in the first accommodating cavity, the second light emitting unit is arranged in the second accommodating cavity, and the third light emitting unit is arranged in the third accommodating cavity, and an encapsulating body is arranged in each of the first accommodating cavity, the second accommodating cavity and the third accommodating cavity, and each light emitting unit is provided with a pair of electrode structures.

7. A lighting device, comprising: The light source module of any one of claims 1 to 6 and a control unit; The control unit is electrically connected to the first light emitting unit, the second light emitting unit and the third light emitting unit respectively.

8. The lighting device of claim 7, wherein: The control unit comprises A power module for converting external alternating current into direct current; A control module for sending control signals; A driving module for receiving the direct current output by the power module and the control signals sent by the control module, and electrically connected to the first light emitting unit, the second light emitting unit and the third light emitting unit respectively and outputting corresponding driving currents to the light emitting units.

9. The illumination device of claim 8, wherein, The control unit further comprises: A collection module for detecting the current signals collected by the sampling resistors of the light emitting units and sending the collected signals to the control module, and the control module adjusts the control signals according to the signals collected by the collection module.

10. A light mixing method of the lighting device of any one of claims 7 to 9, wherein: In the CIE1931 color space, the light is mixed in a triangular region with vertices at (0.5949, 0.3925), (0.1603, 0.1870) and (0.3761, 0.4774).

11. The light mixing method of claim 10, wherein: The emitted light is white light, and when the correlated color temperature of the white light is 1450K to 18000K, the average color rendering index is greater than 80, and the color deviation Duv from black body radiation is less than 0.

002.

12. The light mixing method of claim 11, wherein: The white light has an average color rendering index greater than 90 and a correlated color temperature of 1800K to 7500K.

13. The method of claim 7 to 9, wherein the method of claim 7 to 9 is a method of mixing light of a lighting device, characterized in that: The mixing light is performed in a triangular region with vertices at (0.6511, 0.3435), (0.1599, 0.1501), and (0.3929, 0.5099) in the CIE 1931 color space.

14. The method of claim 13, wherein the method of claim 13 is a method of mixing light of a lighting device, characterized in that: The white light has an average color rendering index greater than 80, a correlated color temperature of 1200K to 60000K, and a color deviation Duv from black body radiation less than 0.

002.

15. The method of claim 14, wherein the method of claim 14 is a method of mixing light of a lighting device, characterized in that: The white light has an average color rendering index greater than 90 and a correlated color temperature of 1800K to 30000K.

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