CN114396571A

CN114396571A - Light source module, lighting system and lamp

Info

Publication number: CN114396571A
Application number: CN202111657386.XA
Authority: CN
Inventors: 朱昌荣; 马海云; 刘超博
Original assignee: Opple Lighting Co Ltd; Suzhou Op Lighting Co Ltd
Current assignee: Opple Lighting Co Ltd; Suzhou Op Lighting Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-26

Abstract

A light source module, a lighting system and a lamp are provided, wherein the light source module comprises a plurality of monochromatic light emitting units with different light colors, the light emitting intensity of the monochromatic light emitting units can be respectively and independently controlled, and full-spectrum white light can be generated after light mixing. The simulation target spectrum of the full spectrum white light is a sunlight spectrum when the relative color temperature is more than 4000K; when the relative color temperature is below 4000K, the target spectrum is a blackbody radiation spectrum. Because the spectrum simulates sunlight or a black body radiation curve, white light obtained by mixing light of the light source has good color rendering property. Meanwhile, the light source module can obtain various colored lights through light mixing, and the presented colors are richer than the colors presented by the conventional light mixing scheme.

Description

Light source module, lighting system and lamp

Technical Field

The invention relates to a light source module, an illumination system and a lamp.

Background

Among various light sources, Light Emitting Diodes (LEDs) are widely used in various light emitting devices such as indoor and outdoor lighting, smart lighting, plant lighting, vehicle lighting, indoor and outdoor display lighting, etc. because of their low power consumption and high luminous efficiency.

In general, if the requirement of dimming and color mixing is required, the adopted scheme is to mix colors with three primary colors of red, green and blue, and the light emitting diode used in the three-primary-color light mixing mode mainly comprises an LED chip with a single wavelength, in this case, because the full-width-at-half-maximum (FWHM) of each single color is narrow, when white light is realized, a sufficient color rendering index cannot be ensured, and when various colors are realized, people feel to catch the front and see the elbow, and cannot perfectly mix all colors. As the living standard of people increases, the demand for illumination becomes more diversified, and therefore, how to provide an illumination device capable of presenting more colors becomes a problem to be solved urgently.

Disclosure of Invention

The present invention is directed to solve the above problems, and provides a light source module capable of adjusting light color temperature and realizing full spectrum white light, and an illumination system and a lamp including the light source module.

In order to achieve the above-mentioned functions, the present invention provides a light source module, which includes a plurality of light emitting units electrically independent from each other:

a first blue light emitting unit emitting blue light with a peak wavelength of 430-455 nm;

the second blue light emitting unit emits blue light with the peak wavelength of 460-480 nm;

the cyan light emitting unit emits cyan light with peak wavelength of 475-;

the green light emitting unit emits green light with the peak wavelength of 515-540nm and the spectrum half width of 90-130 nm;

the yellow light emitting unit emits yellow light with peak wavelength of 560-580nm and spectrum half width of 100-150 nm;

the red light emitting unit emits red light with the peak wavelength of 625-660nm and the spectral half width of 70-100 nm;

the white light emitting unit emits white light with a relative color temperature of 5500K-7000K and a color rendering index CRI larger than 80;

each light-emitting unit is independently controlled, and the emitted light is mixed to form the light emission of the light source module.

Preferably, the light source module further includes a violet light emitting unit, which emits a violet light with a peak wavelength of 390-420nm, and the violet light emitting unit includes a violet light LED chip with a peak wavelength of 390-420 nm.

Preferably, the light color of the cyan light emitting unit is located in a quadrilateral region surrounded by four points of (0.15, 0.44), (0.13, 0.54), (0.05, 0.50) and (0.06, 0.46) as vertexes on a 1931 CIE chromaticity diagram;

the light color of the green light emitting unit is located in a quadrilateral area formed by four points (0.38, 0.49), (0.38, 0.58), (0.33, 0.63) and (0.33, 0.54) as vertexes on a 1931 CIE chromaticity diagram;

the light color of the yellow light-emitting unit is located in a quadrilateral area formed by four points (0.50, 0.45), (0.50 ), (0.43, 0.57) and (0.43, 0.52) which are vertexes on a 1931 CIE chromaticity diagram;

the light color of the red light emitting unit is located in a quadrilateral area formed by four points (0.69, 0.28), (0.69, 0.31), (0.63, 0.37) and (0.63, 0.34) which are vertexes on a 1931 CIE chromaticity diagram;

the light color of the white light emitting unit is located in a quadrilateral area formed by four points (0.34, 0.32), (0.34, 0.37), (0.30, 0.35) and (0.31, 0.28) as vertexes on a 1931 CIE chromaticity diagram.

Preferably, each of the light emitting units includes an LED chip and a package covering the LED chip, wherein:

the LED chip in the first blue light emitting unit is a first blue light LED chip with the peak wavelength of 430-;

the LED chip in the second blue light emitting unit is a second blue light LED chip with the peak wavelength of 460-480 nm;

the LED chips in the cyan light emitting unit, the green light emitting unit, the yellow light emitting unit, the red light emitting unit and the white light emitting unit are third blue light LED chips with peak wavelength of 445-460nm, and the cyan light emitting unit, the green light emitting unit, the yellow light emitting unit, the red light emitting unit and the white light emitting unit further comprise phosphors, wherein the phosphors are configured to be excited by the third blue light LED chips to convert part of light emitted by the blue light LED chips into light with longer wavelength.

Preferably, the difference between the peak wavelengths of any two of the first blue LED chip, the second blue LED chip, and the third blue LED chip is greater than or equal to 7 nm.

Preferably, the blue light content of the cyan light emitting unit, the green light emitting unit and the yellow light emitting unit is less than 10%, and the blue light content of the red light emitting unit is less than 5%.

Preferably, the phosphor in the cyan light emitting unit includes a cyan phosphor, and the cyan phosphor is (Ba, Ca) Si₂N₂O₂:Eu；

And/or the phosphor in the green light emitting unit comprises green phosphor which is (Lu, Yb, Tb)₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂At least one of Ce, beta-SiAlON and Eu or the combination thereof;

and/or the phosphor in the yellow light emitting unit comprises yellow phosphor which is Y₃(Al,Ga)₅O₁₂:Ce、(Ba,Sr,Ca,Mg)SiO₄:Eu、(Ba,Sr,Ca,Mg)₂Si₂O₂N₂At least one of Eu or their combination;

and/or the phosphor in the red light emitting unit comprises red phosphor powder which is CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination.

Preferably, the first and second electrodes are formed of a metal,the phosphor in the white light emitting unit includes white phosphor (Lu, Yb, Tb)₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂:Ce、Y₃(Al,Ga)₅O₁₂:Ce, CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃At least one of Eu or their combination.

Preferably, the light source module is a packaged chip, and includes a main body portion, the main body portion is provided with accommodating grooves equal to the number of the light emitting units, the LED chips are respectively disposed in the accommodating grooves and each have a pair of pins, the pins are electrically isolated from each other, and the package is filled with the green light emitting unit, the yellow light emitting unit, the red light emitting unit, and the white light emitting unit, and the package is mixed with the phosphor.

Preferably, the light emitted by each light-emitting unit is mixed to obtain a full-spectrum white light, and the target spectrum of the full-spectrum white light is a sunlight spectrum when the relative color temperature is above 4000K; when the relative color temperature is below 4000K, the target spectrum is a blackbody radiation spectrum.

Preferably, when the color temperature of the full-spectrum white light is 2700-.

The present invention also provides an illumination system, comprising: a light source and a driving circuit, wherein,

the light source comprises at least one light source module set as claimed in any one of claims 1 to 12;

the driving circuit is respectively connected with and supplies power to each light-emitting unit, and the driving circuit respectively controls the current/voltage supplied to each light-emitting unit.

13. The illumination system of claim 12, wherein the drive circuit comprises:

the power supply conversion module converts an external power supply into a direct-current power supply required by the light source module;

the control module generates a control signal;

and the LED driving module is used for receiving the direct-current power supply output by the power conversion module and the control signal transmitted by the control module, adjusting the direct-current power supply according to the control signal, and is respectively and electrically connected with each unit and outputs driving current/voltage required by each adjusted light-emitting unit to the LED driving module.

Preferably, the control signal is a PWM signal.

Preferably, the control module comprises a communication module for receiving dimming/toning commands from the outside and generating the control signal according to the dimming/toning commands.

Preferably, the control module includes a storage module storing preset control parameter values, where the control parameter values are control parameter values corresponding to the light emitting units when the light source module generates white light with different light colors or different color temperatures, and the control module reads the control parameters to generate the control signals.

Preferably, the light source module is controlled according to the control parameter value to obtain full-spectrum white light, wherein the target spectrum is a sunlight spectrum when the relative color temperature is above 4000K; when the relative color temperature is below 4000K, the target spectrum is a blackbody radiation spectrum.

Preferably, the light source includes more than two light source modules, and the light emitting units of different colors in each light source module are respectively connected in series with the light emitting units of the same color according to the light color and then electrically connected to the LED driving module.

The invention also provides a lamp, which is characterized by comprising the light source module according to any one of claims 1 to 12 or the lighting system according to any one of claims 12 to 19.

The light source module provided by the application comprises a plurality of monochromatic light emitting units with different light colors, wherein the light emitting units can respectively and independently control the light emitting intensity of the monochromatic light emitting units, and the light emitting units can generate full-spectrum white light after light mixing. The simulation target spectrum of the full spectrum white light is a sunlight spectrum when the relative color temperature is more than 4000K; when the relative color temperature is below 4000K, the target spectrum is a blackbody radiation spectrum. Because the spectrum simulates sunlight or a black body radiation curve, white light obtained by mixing light of the light source has good color rendering property. Meanwhile, the light source module can obtain various colored lights through light mixing, and the presented colors are richer than the colors presented by the conventional light mixing scheme.

Drawings

FIG. 1 is a schematic structural diagram of a light source module according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A' of the light source module of the embodiment shown in FIG. 1;

FIG. 3 is a diagram illustrating a spectral power distribution of each unit in the light source module according to the preferred embodiment of the present invention;

FIG. 4 is a color point distribution diagram of a portion of light emitting units in the light source module according to the preferred embodiment of the present invention on a CIE 1931 chromaticity diagram;

FIGS. 5a-5f are spectral energy distribution diagrams of full-spectrum white light obtained by mixing light from the light source module according to the preferred embodiment of the present invention without the participation of the violet light emitting unit;

FIGS. 6a-6f are spectral energy distribution diagrams of full-spectrum white light obtained by mixing light of the light source module in the presence of the violet light emitting unit at different color temperatures according to the preferred embodiment of the present invention;

FIGS. 7a to 7f are spectral energy distribution diagrams of the light source module according to the preferred embodiment of the present invention emitting white light at different color temperatures without the participation of the violet light emitting unit and the white light emitting unit;

FIG. 8a is a diagram illustrating a spectral energy distribution of a low color temperature range of white light emitted by a light source module according to a preferred embodiment of the present invention without a purple light emitting unit and a white light emitting unit;

FIG. 8b is a diagram illustrating a spectral energy distribution of the light source module in the high-temperature region when the violet light emitting unit and the white light emitting unit do not participate in the light source module according to the preferred embodiment of the present invention;

FIGS. 9a-9d are diagrams illustrating spectral power distribution of color light obtained by mixing light from each unit of a light source module according to a preferred embodiment of the present invention;

FIG. 10 is a distribution diagram of color points of color lights obtained by mixing lights of units of the light source module according to the preferred embodiment of the present invention on a CIE 1931 chromaticity diagram;

FIG. 11 is a schematic diagram of the construction of a preferred embodiment of the illumination system of the present invention;

fig. 12a, 12b, 12c and 12d are schematic views of package structures of light source modules according to other preferred embodiments of the invention;

fig. 13 is a schematic structural view of a lamp according to a preferred embodiment of the present invention.

Detailed Description

The light source module, the lighting system and the lamp according to the present invention will be described in further detail with reference to the accompanying drawings and some preferred embodiments according to the present invention.

The light source module of the present invention is a light mixing LED package chip, and the package form may be PLCC chip package, ceramic chip package, CSP package, all-in-one single chip package, or COB chip integrated package, which is not limited in this application.

As shown in fig. 1, the light source module includes a main body 60, and a plurality of light emitting units, namely a violet light emitting unit 500, a first blue light emitting unit 100, a second blue light emitting unit 600, a cyan light emitting unit 200, a green light emitting unit 700, a yellow light emitting unit 300, a red light emitting unit 800, and a white light emitting unit 400, disposed in the main body 60 and spaced apart from each other. Each light emitting unit includes an LED chip and a package covering the LED chip, and the detailed structure of the light source module is illustrated with reference to a cross-sectional view of fig. 2 taken along a direction a-a'. For the sake of clarity of showing the interior of the light emitting unit, we will use the middle position of the light emitting unit as a cross section, so that only four light emitting units on one side can be seen in the cross section of fig. 2, and it should be understood that the interior structure of the light emitting unit on the other side is similar to that of the light emitting unit.

In this embodiment, the main body 60 is a plastic frame, and a plurality of receiving

grooves

61, 62, 63, 64 are formed therein for receiving the package. The plastic bracket may be made of any one of PPA, PCT, and EMC. The first blue light emitting unit 100 is located in the leftmost accommodating groove 61, includes the first blue LED chip 101, and is attached with a pair of

leads

51a and 51b, and the accommodating groove 61 is filled with the package 102. The blue light emitting unit 200 is located in the receiving cavity 62, and includes a third blue LED chip 201 for exciting phosphor, and a pair of

leads

52a and 52b, and the package 202 is mixed with a phosphor 203, and the mixture fills the receiving cavity 62. The yellow light emitting unit 300 is located in the receiving cavity 63, and includes a third blue LED chip 301 for exciting phosphor, and a pair of

leads

53a and 53b, and a package 302 mixed with a phosphor 303 is filled in the receiving cavity 63. The white light emitting unit 400 is located in the receiving cavity 64, and includes a third blue LED chip 401 for exciting phosphor, and a pair of

leads

54a and 54b, and the package 402 is mixed with a phosphor 403, and the mixture fills the receiving cavity 64. The

leads

51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b are electrically isolated from each other. The LED Chip (LED Chip) comprises a positive mounting or a reverse mounting, and a single LED Chip or a plurality of LED chips are connected together in series, parallel or series-parallel. The

package body

102, 202, 302, 402 is made of silicon-based resin, epoxy resin, or a combination thereof to ensure electrical isolation between the light emitting

units

100, 200, 300, 400. The

phosphors

203, 303, 403 are configured to be excited by the third

blue LED chips

201, 202, 203 to convert part of the light emitted by the third

blue LED chips

201, 202, 203 into light of a specific color with a longer wavelength, such as cyan light required by the cyan light emitting unit 200 and yellow light required by the yellow light emitting unit 300, while the white light emitting unit generally converts part of the blue light into yellow-green light and mixes the blue light to obtain white light. The other sides of the violet light emitting unit 500, the second blue light emitting unit 500, the green light emitting unit 700, and the red light emitting unit 800 are similar in structure, and a description thereof will not be repeated.

The above is a package structure of a preferred embodiment of the light source module, and other package structures can be adopted in other preferred embodiments, and we take the white light emitting unit 400 as an example to describe some other preferred package forms. The package structure of the embodiment in fig. 12a and 12b also adopts a bracket structure as the embodiment in fig. 2, and the bracket is formed with a receiving groove 64, and only a partial structure of the light source module, i.e. a white light emitting unit 400, is shown in the figure. The third blue LED chip 401 is disposed in the receiving groove 64. In the embodiment of fig. 12a, after the placement of the third blue LED chip 401 is completed, the electrical connection is realized through the

pins

54a and 54b and the outside. The phosphor 403 is first spread on the surface of the third blue LED chip 401 by spraying or coating, and then the package 402 fills the receiving groove 64. In fig. 12b, the package 402 is filled into the receiving cavity 64 in which the third blue LED chip 401 is placed, and then the phosphor 403 is spread on the upper surface of the package 402 by spraying or coating. And fig. 12c is a ceramic high-power packaging manner, in which a ceramic or metal material is used as the substrate 94, the third blue LED chip 401 is disposed on the substrate 94, the phosphor 403 is sprayed, a phosphor film is pressed, or a phosphor ceramic sheet is attached on the surface of the blue LED chip 401 to form a light conversion layer, and then the package 402 is filled by a mold injection molding manner to cover the phosphor 403 and the blue LED chip 401. Fig. 12d shows a CSP package, which is suitable for high-power chip, and is implemented by mixing a ceramic or metal substrate 94, a phosphor 403 and a package 402, and then forming a light conversion layer on the surface of a blue LED chip 401 by a phosphor film lamination method. The above embodiments are all able to achieve the object of the present invention, and the present invention is not limited thereto.

The light source module includes eight light emitting units, each of which emits monochromatic light of different colors, and the light emitted from the light source module is formed by mixing the light from each of the light emitting units, and the optical characteristics of each of the light emitting units are described in detail below.

The purple light emitting unit 500 includes a purple light LED chip, which directly emits light, and emits purple light with a peak wavelength of 390-. The spectrum of which is indicated as V in fig. 3.

The first blue light emitting unit 100 includes a first blue light LED chip 101, which directly emits light and emits blue light with a peak wavelength of 430-. The spectrum of which is labeled B _1 in fig. 3.

The second blue light emitting unit 600 includes a second blue light LED chip, which directly emits light to emit blue light with peak wavelength of 460-480 nm. The spectrum of which is labeled B _2 in fig. 3.

The cyan-light emitting unit 200 is,comprises a third blue LED chip 201 and a package 202, wherein the package 202 contains a phosphor 203, the phosphor 203 comprises a cyan phosphor, and the cyan phosphor is (Ba, Ca) Si in the embodiment₂N₂O₂Eu, phosphor 203 is excited by third blue LED chip 201, converting most of the blue light into cyan light of longer wavelength. The peak wavelength of the light emitted by the cyan light emitting unit 200 is 475-505nm, the half width of the spectrum is 20-60nm, and the spectrum is marked as C in FIG. 3. The light color is cyan, and is located in a quadrilateral region surrounded by four points (0.15, 0.44), (0.13, 0.54), (0.05, 0.50) and (0.06, 0.46) as vertexes on a 1931 CIE chromaticity diagram, that is, a region D1 indicated in fig. 4, since most of the energy emitted by the third blue LED chip 201 is converted into cyan light by the phosphor 203, the blue light content in the light emitted by the cyan light emitting unit 200 is less than 10%. The blue light content is less than 10%, which means that the energy in the region of 440-480nm in the blue light band is less than 10% of the total energy in the light emitted by the light-emitting unit.

The green light emitting unit 700 comprises a third blue LED chip and a package, wherein the package contains a phosphor, and the phosphor comprises a green phosphor, and the green phosphor is (Lu, Yb, Tb) in the embodiment₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂At least one of Ce, beta-SiAlON and Eu or their combination. The phosphor is excited by the third blue LED chip to convert most of the blue light to longer wavelength green light. The peak wavelength of the light emitted by the green light-emitting unit 700 is located at 515-540nm, the half width of the spectrum is 90-130nm, and the spectrum is marked as G in FIG. 3. The light color is green, and is located in a quadrilateral region surrounded by four points of (0.38, 0.49), (0.38, 0.58), (0.33, 0.63), and (0.33, 0.54) on the 1931 CIE chromaticity diagram, i.e., the region D2 indicated in fig. 4. Since most of the energy emitted from the third blue LED chip is converted into green light by the phosphor, the blue light content in the light emitted from the green light emitting unit 700 is less than 10%.

The yellow light emitting unit 300 includes a third blue LED chip 301 and a package 302, the package 302 contains a phosphor 303, the phosphor 303 includes a yellow phosphor, and the yellow phosphor is Y in this embodiment₃(Al,Ga)₅O₁₂:Ce、(Ba,Sr,Ca,Mg)SiO₄:Eu、(Ba,Sr,Ca,Mg)₂Si₂O₂N₂Eu, the phosphor 303 is excited by the third blue LED chip 301, converting most of the blue light into yellow light of longer wavelength. The yellow light-emitting unit 300 emits light with a peak wavelength of 560-580nm and a half-width of spectrum of 100-150nm, and the spectrum is denoted as Y in FIG. 3. The light color is yellow, and is located in a quadrilateral region enclosed by four points (0.50, 0.45), (0.50 ), (0.43, 0.57) and (0.43, 0.52) as vertexes on a 1931 CIE chromaticity diagram, namely a region D3 indicated in fig. 4, because most of the energy emitted by the third blue LED chip 301 is converted into yellow light by the phosphor 303, the blue light content in the light emitted by the yellow light-emitting unit 300 is less than 10%.

The red light emitting unit 800 includes a third blue LED chip and a package, wherein the package contains a phosphor, the phosphor includes a red phosphor, and the red phosphor in this embodiment is CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination. The phosphor is excited by the third blue LED chip to convert most of the blue light to longer wavelength red light. The peak wavelength of the light emitted by the red light emitting unit 800 is 625-660nm, the half width of the spectrum is 70-100nm, and the spectrum is labeled as R in FIG. 3. The light color is red, and is located in a quadrilateral region surrounded by four points (0.69, 0.28), (0.69, 0.31), (0.63, 0.37) and (0.63, 0.34) on the 1931 CIE chromaticity diagram, i.e., the region D4 marked in fig. 4. Since most of the energy emitted from the third blue LED chip is converted into red light by the phosphor, the blue light content in the light emitted from the red light emitting unit 800 is less than 5%.

The white light emitting unit 400 includes a third blue LED chip 401 and a package 402, the package 402 contains a phosphor 403, the phosphor 403 includes a white phosphor, and the white phosphor is (Lu, Yb, Tb) in this embodiment₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂:Ce、Y₃(Al,Ga)₅O₁₂:Ce, CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃At least one of EuOr a combination thereof. The phosphor 403 is excited by the third blue LED chip 402, and converts a part of the blue light into yellow-green light and/or red-orange light with longer wavelength, and then mixes with the blue light emitted from the third blue LED chip 402 to form white light. The white light emitting unit 400 emits white light with a relative color temperature of 5500K to 7000K and a color rendering index CRI greater than 80, a spectrum of which is denoted as W in fig. 3, and a color of which is located within a quadrilateral region surrounded by four points (0.34, 0.32), (0.34, 0.37), (0.30, 0.35), (0.31, 0.28) on a 1931 CIE chromaticity diagram, that is, a region D5 denoted in fig. 4.

The first and second blue

light emitting units

100 and 600 use blue LED chips with different wavelengths, because the fluorescent powder generally has a wider distribution in the full-width half-maximum (FWHM) of the spectrum, and the FWHM of the monochromatic LED chip is narrower. The chips with different peak wavelengths can form a superposition mode in a blue light wave band, so that the overall energy distribution of the blue light region is more uniform, the color rendering of white light generated by mixing is better, and the dimming color gamut of the light source module is wider. Meanwhile, the cyan light emitting unit 200, the green light emitting unit 700, the yellow light emitting unit 300, the red light emitting unit 800, and the white light emitting unit 400 all include blue LED chips for exciting the phosphor, and in this embodiment, the same blue LED chips are used as the excitation light sources in the light emitting units, i.e., the third

blue LED chips

201, 301, 401, and the like. The peak wavelength of the third blue light LED chip is different from that of the first blue light LED chip and the second blue light LED chip at 445-plus 460nm, so that the energy distribution of the blue light wave band is more uniform. In order to ensure the superposition effect, in a preferred scheme, the peak wavelengths of the three blue LED chips are within a given range, and the difference between the peak wavelengths of any two of the three blue LED chips is greater than or equal to 7 nm. In other preferred embodiments, blue LED chips with different peak wavelengths can be selected from the light emitting units excited by the phosphor, so that the energy of the whole blue light band can be more dispersed. However, because each LED chip in the light source module is individually powered and individually controlled, the excessive selection of the LEDs may make the setting in the aspect of control more complicated, and particularly, the selection may be flexibly selected according to the design requirements.

The spectral energy distribution of each light-emitting unit is shown in fig. 3, and by performing dimming control on each light-emitting unit, the light source module in this embodiment can emit light of various colors, and can obtain full-spectrum white light when synthesizing white light. The simulation target spectrum of the full spectrum white light is a sunlight spectrum when the target color temperature is above 4000K; when the target color temperature is below 4000K, the target spectrum is a black body radiation spectrum. Because the spectrum simulates sunlight or a black body radiation curve, the white light color rendering property obtained by light mixing of the light source is better, and the CRI larger than 97 can be realized.

Another preferred embodiment of the present invention is an illumination system as shown in fig. 11, which includes the light source module 1 and the driving circuit 2 in the above embodiments.

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 supply, and converts the external power supply into a dc power supply required by the light source module 1. The control module 22 includes a communication module for receiving the dimming/toning command from the outside and generating a control signal according to the dimming/toning command. The communication module may be a wired or wireless communication module, which is not limited in the present invention. The LED driving module 23 inputs the dc power outputted by the power conversion module 21 and the control signal transmitted by the control module 22, adjusts the dc power according to the control signal, and respectively outputs the driving current/voltage required by each of the adjusted

light emitting units

100 and 800 to each of the

light emitting units

100 and 800 in the light source module 1. Therefore, the LED driving module 23 needs to be electrically connected to each of the

light emitting units

100 and 800. When the lighting system includes a plurality of light source modules 1, as shown in fig. 7, the

light emitting units

100 and 800 in each light source module 1 are respectively connected in series and then electrically connected to the LED driving module 23.

As described above, in the embodiment, the light source module 1 can mix light to generate color lights of various colors, and can obtain full spectrum white light when synthesizing white light, so the control module 22 includes a storage module storing preset control parameter values, where the control parameter values correspond to the light emitting units 100-800 when the light source module 1 generates different colors or color temperatures. The control parameter value may be a voltage value, a current value or a PWM signal. When the external device sends a change request, the control module 22 receives the command, reads the correlation value in the storage module, forms a control signal, and sends the control signal to the LED driving module 23, and adjusts the current/voltage output to each of the

light emitting units

100 and 800, so that the light source module 1 emits white light with a corresponding color or a corresponding color temperature.

In this embodiment, the control signal is a PWM signal, each of the

light emitting units

100 and 800 is independently controlled by a PWM dimming method, and different duty ratios are applied to modulate the light emitting power of each of the light emitting units to achieve the light mixing effect.

When the light source module 1 works, each of the

light emitting units

100 and 800 can emit light simultaneously, or only part of the light emitting units can be used to realize the light emitting of the light source module 1. In the white light source module of the past, adopt RGB mixed light to realize usually, but the respective spectrum half width of three monochromatic source is limited for the energy distributes unevenly in whole spectrum, and the energy of some wave bands is not enough, thereby can't realize full spectrum. The light source module 1 in this embodiment specifically selects 8 kinds of light emitting units with different colors, and obtains full spectrum white light by mixing light.

The full spectrum white light is realized by simulating a target spectrum, and when the target color temperature is lower than 4000K, the light emission spectrum takes a blackbody radiation spectrum as a target spectrum. When the target color temperature is above 4000K, the light emission spectrum takes the simulated sunlight spectrum as the target spectrum. The daylight spectrum is the relative spectral power distribution of a D-series standard illuminant specified by the International Commission on illumination (CIE), and the blackbody radiation spectrum (B) of the daylight spectrum conforms to the following relationship at different color temperatures (T) and at different blackbody radiation spectra (B):

wherein T represents the color temperature, h is the Planck constant, c is the speed of light (3x 10)⁸m/s), K is Boltzmann constant, T_BIs the black body absolute temperature and is the wavelength of radiation.

In order to evaluate the degree of matching between the spectrum of the white light obtained by the light mixing in the embodiments of the present invention and the target spectrum, the spectrum matching degree is evaluated by referring to the Average spectrum deviation value (ASD) published by the american general company (Bridgelux inc. USA), which is similar to the TM-30 standard published by the North american lighting Engineering Society of North America (IES), i.e. 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 spectrum emitted by the black body radiation light source is based on the spectrum emitted by the black body radiation light source, and the color temperature is between 4000K and 5000K, which uses the spectrum emitted by the mixed light source of the black body radiation light source and the D78 standard illuminant as the standard 89 50, in addition, considering the band distribution of the human eye visual sensitivity response, the evaluation range of the spectral deviation is limited between 425nm and 690nm, and the specific calculation mode is as follows:

wherein phi is_refPhi is the relative intensity of the light source to be evaluated, and lambda is the wavelength, for the relative intensity of the reference light source.

Several LED light sources with a relative color temperature of 4000K are listed below, and the average spectral deviation values thereof are calculated according to the above evaluation method as reference values for comparison in the examples of the present application. The conventional Ra80 white LED had an ASD value of 32%, the conventional Ra90 white LED had an ASD value of 22%, and the conventional Ra95 white LED had an ASD value of 19%.

In the existing solutions, there are also light source products that can implement full spectrum white light, but these products usually only relate to one color temperature, are monochromatic warm white light chips, and cannot implement full spectrum white light under variable color temperature. The full spectrum white light spectrum effect obtained by distributing different control signals to the light emitting units by the light source module 1 covers the interval range of 2700K to 6500K, wherein the purple light emitting unit 100 does not need to participate in light emitting. Fig. 5a to 5f are distribution diagrams showing spectral energy distribution diagrams of different color temperatures of the full spectrum white light obtained by mixing light of the light source module 1 without the involvement of the violet light emitting unit 100, and comparison with the target spectrum. Wherein FIG. 5a is a graph comparing the emission spectra curves of a standard blackbody radiation source at a target color temperature of 2700K; FIG. 5b is a graph comparing the emission spectrum curve of a standard blackbody radiation source at a target color temperature of 3000K; FIG. 5c is a graph comparing the emission spectra curves of a standard D40 light source at a target color temperature of 4000K; FIG. 5D is a graph comparing the emission spectra curves of a standard D50 light source at a target color temperature of 5000K; FIG. 5e is a graph comparing the emission spectra curves of a standard D57 light source at a target color temperature of 5700K; FIG. 5f is a graph comparing the emission spectra curves of a standard D65 light source at a target color temperature of 6500K. The actual color temperature, average spectral deviation value (ASD), color deviation from black body radiation (Duv), Color Rendering Index (CRI), color fidelity (Rf), color saturation (Rg), and R1 through R15 of the full spectrum white light realized by the light source module 1 at different target color temperatures are listed in table 1. The target color temperature described herein is a desired color temperature, and the actual values at the determined target color temperature are slightly different due to individual product, and the color temperatures listed in table 1 are all measured values corresponding to the target color temperature. This is similar in the other figures herein and will not be described further

TABLE 1

As can be seen from fig. 5a-5f, the white light produced by the mixing is already very close to the target curve, as can also be seen from the average spectral deviation ASD in table 1, with a maximum deviation of 12.6% at 2700K, less than 13%, superior to the 19% ASD value of the conventional Ra95 white LED described above. Therefore, the light source module 1 can realize the simulation of the target spectrum in the color temperature range of 2700K-6500K without the participation of the purple light luminous unit, thereby achieving good color rendering effect, the upper table shows that the color rendering indexes CRI of all the color temperatures are more than or equal to 97, the color rendering indexes (R1-R15) are more than 90, the evaluation is carried out according to the IES TM30-15 standard, the color fidelity Rf is more than 95, and the color saturation Rg is more than 99.

The full spectrum can be realized without purple light because the average spectral deviation value ASD to which we refer is limited to 425nm to 690nm in the spectral deviation evaluation range. Therefore, the addition of violet components does not affect the ultraviolet light component, but the natural light still contains the violet components, so that the violet components are added to realize the full spectrum in the visible light range. Fig. 6a to 6f show the spectral energy distribution and the comparison of the target spectrum of the full spectrum white light with the target color temperatures of 2700K, 3000K, 4000K, 5000K, 5700K, and 6500K, which is generated by the 8 light emitting units of the light source module 1 of the embodiment emitting light simultaneously under the control of the driving circuit 2. The specific parameters corresponding to the various color temperatures are as follows: actual color temperature, average spectral deviation value (ASD), color deviation from black body radiation (Duv), Color Rendering Index (CRI), color fidelity (Rf), color saturation (Rg), and R1 through R15, as shown in table 2.

TABLE 2

From the parameters in Table 2, the numerical values are similar to those in Table 1, and the color temperature color rendering indexes CRI are all more than or equal to 97, the color rendering indexes (R1-R15) are all more than 90, the color fidelity Rf is more than 95 and the color saturation Rg is more than 99 according to the IES TM30-15 standard evaluation. Which is described in detail below. The average spectral deviation value ASD is a little smaller than the result without purple light, but the difference is small, and the difference of the data is below 1%. However, from the spectrogram, it is apparent that energy is supplemented in the violet part in fig. 6a to 6f, so that the whole simulation of the target spectrum is more suitable, and the definition of full spectrum white light is more satisfied. Therefore, through the mixing of the light emitted by the 8 light-emitting units, full-spectrum white light can be generated, and a good sunlight simulation effect is realized.

Under the condition that the purple light emitting unit 100 and the white light emitting unit 400 do not participate, the other 6 light emitting units can also mix light to form white light, the spectral energy distribution of the white light with the target color temperatures of 2700K, 3000K, 4000K, 5000K, 5700K and 6500K generated by the mixing light and the comparison graph of the target spectrum are shown in FIGS. 7a to 7f, and the specific parameters are shown in Table 3

TABLE 3

As can be seen from table 3, although the color rendering property is still high, the average spectrum deviation ASD is higher than that of the case where 7 light-emitting units or 8 light-emitting units emit light simultaneously, and it can be seen from the spectrogram that the deviation from the target spectrum is large. However, in the case of 6 light emitting units, since there is no influence of the color temperature of the white light emitting unit 400 itself, a wider color temperature range can be realized. Fig. 8a shows a relative spectrum of two lower color temperatures, wherein the target color temperature 1600K is denoted as L1 and the target color temperature 2200K is denoted as L2. Fig. 8b shows a relative spectrum of three higher color temperatures, wherein the target color temperature 8000K is denoted as U1, the target color temperature 10000K is denoted as U2, the target color temperature 20000K is denoted as U3, and the relevant parameters are shown in table 4.

TABLE 4

As can be seen from table 4, although the simulation of the target spectrum cannot be achieved by 6 light emitting units, the good color rendering property is still maintained, the achievable white light spectrum has a wide color temperature coverage range, the color temperature range is from 1600K to 20000K, and the color rendering index CRI is greater than 90.

In addition to realizing the white light, another major feature of the illumination system of the present embodiment is that various color lights can be realized, some possible color generation manners are exemplarily shown in table 5, and the participation of the light emitting units in various colors and the color point coordinates (Cx, Cy) on the CIE color space are shown in the table.

TABLE 5

In table 7, the relative spectrums of two colors in the violet color system are shown in fig. 9a, the relative spectrums of three colors in the blue color system are shown in fig. 9b, the relative spectrums of two colors in the green color system are shown in fig. 9c, the relative spectrums of two colors in the red color system are shown in fig. 9d, and the color point distribution diagram of each color on the CIE 1931 chromaticity diagram is shown in fig. 10.

In summary, the light source module and the lighting system provided in the present application can realize full spectrum white light in 7 or 8 light mixing modes by preferably selecting the combination of the monochromatic light emitting units with specific spectral characteristics, and can realize white light with a wide color temperature range without the participation of the violet light and white light emitting units, and can also generate colored light with various colors, so that the application range is very wide.

The light source module and the lighting system can be applied to various lamps, and fig. 13 shows a lamp D1 according to a preferred embodiment of the present application. The lamp D1 is a lamp panel, and includes the above-mentioned lighting system, and in other preferred embodiments, it may be a ceiling lamp, or the light source module 1 may also be applied to various lamps such as a desk lamp, a down lamp, a spot lamp, etc. as a common white light chip. The lamp D1 includes a chassis 86, a face frame 88 provided with a diffusion plate 89, a plurality of light source modules 1 provided on a light source board 85, and a power supply box 87, and the drive circuit 2 is provided in the power supply box 87. In the lamp, the purple light emitting unit 500, the first blue light emitting unit 100, the second blue light emitting unit 600, the cyan light emitting unit 200, the green light emitting unit 700, the yellow light emitting unit 300, the red light emitting unit 800 and the white red light emitting unit 400 in the light source module 1 are respectively wired, and the similar light emitting units in each light source module 1 are connected in series and then connected to the driving circuit 2 in the power supply box 87, so that the lighting system is formed. The luminaire D1 may also have a controller, heat sink, light distribution components, etc. depending on the function and requirements of the particular luminaire. The controller may be used to adjust the color and intensity of the illumination light emitted by the light source module L1, and the light distribution component may be a lampshade, a lens, a diffusion element, a light guide, etc. besides the diffusion plate in the embodiment. The invention is not limited in this regard.

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form disclosed, and it will be apparent that numerous modifications and variations may be made thereto, which will be apparent to those skilled in the art, and are intended to be included within the scope of the invention as defined by the following claims.

Claims

1. A light source module is characterized by comprising a plurality of light emitting units which are electrically independent from each other:

the cyan light emitting unit emits cyan light with peak wavelength of 475-;

2. The light source module as claimed in claim 1, wherein the light source module further comprises a violet light emitting unit for emitting violet light with a peak wavelength of 390-420nm, and the violet light emitting unit comprises a violet light LED chip with a peak wavelength of 390-420 nm.

3. The light source module as claimed in claim 1, wherein the cyan light emitting unit has a color in a quadrilateral region defined by four points (0.15, 0.44), (0.13, 0.54), (0.05, 0.50) and (0.06, 0.46) on a 1931 CIE chromaticity diagram;

4. The light source module according to any one of claims 2 or 3, wherein each of the light emitting units includes an LED chip and a package covering the LED chip, wherein:

5. The light source module of claim 4, wherein a difference in peak wavelength between any two of the first blue LED chip, the second blue LED chip, and the third blue LED chip is greater than or equal to 7 nm.

6. The light source module of claim 4, wherein the blue light content of the cyan light emitting unit, the green light emitting unit and the yellow light emitting unit is less than 10%, and the blue light content of the red light emitting unit is less than 5%.

7. The light source module as claimed in claim 4, wherein the phosphor in the cyan light emitting unit comprises a cyan phosphor, and the cyan phosphor is (Ba, Ca) Si₂N₂O₂:Eu；

8. The light source module as claimed in claim 4, wherein the phosphor in the white light emitting unit comprises a white phosphor, and the white phosphor is (Lu, Yb, Tb)₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂:Ce、Y₃(Al,Ga)₅O₁₂:Ce, CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃In Eu toOne or a combination thereof.

9. The light source module of claim 4, wherein the light source module is a packaged chip, and comprises a main body portion, the main body portion is provided with a number of receiving slots equal to the number of the light emitting units, the LED chips are respectively disposed in the receiving slots and each have a pair of leads, the leads are electrically isolated from each other, the package is filled to receive and cover the LED chips, and the package is mixed with the phosphor in the cyan light emitting unit, the green light emitting unit, the yellow light emitting unit, the red light emitting unit, and the white light emitting unit.

10. The light source module as claimed in claim 2 or 3, wherein the light emitted from each of the light emitting units is mixed to obtain a full spectrum white light, and the simulated target spectrum of the full spectrum white light is a daylight spectrum when the relative color temperature is above 4000K; when the relative color temperature is below 4000K, the target spectrum is a blackbody radiation spectrum.

11. The light source module as claimed in claim 10, wherein the average spectral deviation ASD from the target spectrum is less than 13% when the color temperature of the full-spectrum white light is 2700-.

12. An illumination system, comprising: a light source and a driving circuit, wherein,

13. The illumination system of claim 12, wherein the drive circuit comprises:

the control module generates a control signal;

14. The lighting system, as set forth in claim 13, wherein the control signal is a PWM signal.

15. The lighting system of claim 13, wherein the control module comprises a communication module for receiving externally transmitted dimming/toning commands and generating the control signal accordingly.

16. The illumination system of claim 13, wherein the control module comprises a storage module storing preset control parameter values, the control parameter values are corresponding control parameter values of each of the light emitting units when the light source module generates white light with different light colors or different color temperatures, and the control module reads the control parameters to generate the control signals.

17. The illumination system of claim 16, wherein the light source module is controlled according to the control parameter values to obtain a full spectrum white light, the full spectrum white light having a simulated target spectrum, wherein the target spectrum is a daylight spectrum when the color temperature is above 4000K; when the color temperature is below 4000K, the target spectrum is a black body radiation spectrum.

18. The light source module as claimed in claim 17, wherein the average spectral deviation ASD from the target spectrum is less than 13% when the color temperature of the full-spectrum white light is 2700-.

19. The illumination system of claim 13, wherein the light source comprises more than two light source modules, and the light emitting units of different colors in each light source module are respectively connected in series with the light emitting units of the same color according to the light colors of the light source modules and then electrically connected to the LED driving module.

20. A luminaire comprising a light source module according to any one of claims 1 to 12 or comprising a lighting system according to any one of claims 12 to 19.