CN114396572A

CN114396572A - Light source module, lighting system and lamp

Info

Publication number: CN114396572A
Application number: CN202111657388.9A
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 eight single-color light-emitting units with different colors, the light-emitting intensity of the single-color light-emitting units can be independently controlled respectively, and the mixed light can be combined to form white light with different color temperatures and color light with different colors. The single-color light emitting unit with specific color is selected, the peak wavelength of the single-color light emitting unit is distributed in the whole visible light wavelength range, and the green light part utilizes the characteristic of wider FWHM of the fluorescent powder, so that the white light obtained by light mixing of the single-color light emitting unit has good color rendering property and can present colorful light.

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 with adjustable light color temperature and color adjustment, and a lighting system and a lamp including the light source module.

In order to achieve the above-mentioned functions, the present invention adopts a technical solution of providing a light source module, which is characterized by comprising 8 light emitting units electrically independent from each other, wherein each of the 8 light emitting units comprises:

a first blue light emitting unit emitting blue light with a peak wavelength of 455-475 nm;

a second blue light emitting unit emitting blue light having a peak wavelength of 445-455 nm;

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

the first green light emitting unit emits green light with the peak wavelength of 515-535nm and the spectrum half width of 90-130 nm;

the second green light emitting unit emits green light with the peak wavelength of 535-555nm and the spectrum half width of 90-130 nm;

the yellow light emitting unit emits yellow light with the peak wavelength of 555-580nm and the spectral half width of 100-150 nm;

the first red light emitting unit emits red light with peak wavelength of 615-640nm and spectrum half width of 60-100 nm;

the second red light emitting unit emits red light with the peak wavelength of 640-660nm and the spectrum half width of 60-100 nm;

the light emitting units are controlled independently, and the emitted light is mixed to form the light emitting of the light source module.

Preferably, a difference between a peak wavelength of the first blue light-emitting unit and a peak wavelength of the second blue light-emitting unit is 5nm or more;

and/or the difference between the peak wavelength of the first green light emitting unit and the peak wavelength of the second green light emitting unit is greater than or equal to 10 nm;

and/or the difference between the peak wavelength of the first red light-emitting unit and the peak wavelength of the second red light-emitting unit is greater than or equal to 15 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 first green light emitting unit is located in a quadrilateral area formed by four points (0.37, 0.50), (0.37, 0.58), (0.30, 0.65) and (0.30, 0.57) which are vertexes on a 1931 CIE chromaticity diagram;

the light color of the second green light emitting unit is located in a quadrilateral area formed by four points (0.42, 0.48), (0.42, 0.57), (0.37, 0.62) and (0.37, 0.53) which are 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 colors of the first red light emitting unit and the second red light emitting unit are located in a quadrilateral area formed by four points (0.70, 0.30), (0.64, 0.36), (0.64, 0.34) and (0.70, 0.28) as vertexes on a 1931 CIE chromaticity diagram.

Preferably, each of the light emitting units includes a blue LED chip and a package covering the blue LED chip, wherein the cyan light emitting unit, the first green light emitting unit, the second green light emitting unit, the yellow light emitting unit, the first red light emitting unit, and the second red light emitting unit further include a phosphor, and the phosphor is configured to be excited by the blue LED chip to convert a part of light emitted by the blue LED chip into light with a longer wavelength.

Preferably, the blue light content of the cyan light emitting unit and the yellow light emitting unit is lower than 10%, the blue light content of the first green light emitting unit and the second green light emitting unit is lower than 15%, and the blue light content of the first red light emitting unit and the second red light emitting unit is lower than 5%.

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

Preferably, the phosphor in the first green light emitting unit and the second green light emitting unit includes a green phosphor, and the green phosphor is (Lu, Yb, Tb)₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂At least one of Ce, beta-SiAlON and Eu or their combination.

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

Preferably, the phosphors in the first and second red light emitting units include red phosphor, and the red phosphor is CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination.

Preferably, the light source module is a package 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 blue light 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 in the first blue light emitting unit and the second blue light emitting unit, the accommodating grooves directly filled by the package body cover the blue light LED chips; the packaging body and the fluorescent body in the cyan light emitting unit, the first green light emitting unit, the second green light emitting unit, the yellow light emitting unit, the first red light emitting unit and the second red light emitting unit are mixed and then filled in the containing groove and cover the blue light LED chip.

Preferably, the light source module emits light by the first blue light emitting unit, the first green light emitting unit, the second green light emitting unit and the first red light emitting unit, and can mix white light with a color temperature ranging from 2000K to 20000K, and a color rendering index CRI in the color temperature range is greater than 90.

Preferably, the light emitting units of the light source module mix light to obtain white light, and when the color temperature of the emitted 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.

Preferably, the driving circuit includes:

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 light-emitting unit and outputs the driving current/voltage required by each adjusted light-emitting unit.

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, where preset control parameter values are stored, 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 parameter values to generate the control signal.

Preferably, the light source module is controlled according to the control parameter value, and the color rendering index CRI of the obtained white light is greater than 90 in the color temperature range of 2000-.

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 13 to 19.

The light source module provided by the invention comprises eight single-color light-emitting units with different colors, the light-emitting intensities of the single-color light-emitting units can be respectively and independently controlled, and the mixed light can be combined to form white light with different color temperatures and color lights with different colors. The single-color light emitting unit with specific color is selected, the peak wavelength of the single-color light emitting unit is distributed in the whole visible light wavelength range, and the green light part utilizes the characteristic of wider FWHM of the fluorescent powder, so that the white light obtained by light mixing of the single-color light emitting unit has good color rendering property and can present colorful light.

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-5c are spectral power distribution diagrams of white light obtained by mixing eight light-emitting units of a light source module according to a preferred embodiment of the invention at different color temperatures;

FIG. 6 is a diagram illustrating the color rendering and color temperature of white light obtained by mixing light from the light emitting units of the light source module according to the preferred embodiment of the present invention;

FIGS. 7a and 7b are spectral energy distribution diagrams of white light obtained by mixing light from a part of light emitting units of a light source module according to a preferred embodiment of the present invention at different color temperatures;

FIGS. 8a-8d are spectral energy distribution diagrams of white light with special effects obtained by mixing light from eight light-emitting units of the light source module according to the preferred embodiment of the invention;

FIGS. 9a and 9b are diagrams illustrating spectral energy 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 first blue light emitting unit 100, a second blue light emitting unit 500, a cyan light emitting unit 600, a first green light emitting unit 200, a second green light emitting unit 300, a yellow light emitting unit 700, a first red light emitting unit 400, and a second red light emitting unit 800, disposed on 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 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 first green light emitting unit 200 is located in the receiving cavity 62, and includes a 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 is filled in the receiving cavity 62. The second green light emitting unit 300 is located in the receiving cavity 63, and includes a 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 first red light emitting unit 400 is located in the receiving cavity 64, includes a blue LED chip 401 for exciting phosphor, and is attached with 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

blue LED chips

201, 202, 203 to convert part of the light emitted from the

blue LED chips

201, 202, 203 into light of a specific color having a longer wavelength, such as green light required by the first green light emitting unit 200 and the second green light emitting unit 300, and red light of the first red light emitting unit. The second blue light emitting unit 500, the cyan light emitting unit 600, the yellow light emitting unit 700, and the second red light emitting unit 800 on the other side 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 first red 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 in the embodiment in fig. 2, and the bracket is formed with a receiving groove 64, and only a part of the structure of the light source module, i.e. a first red light emitting unit 400, is shown in the figure. The blue LED chip 401 is disposed in the accommodation groove 64. In the embodiment of fig. 12a, after the placement of the blue LED chip 401 is completed, the electrical connection is made with the external through the

pins

54a, 54 b. The phosphor 403 is first spread on the surface of the 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 of the blue LED chip 401, and then the phosphor 403 is spread on the top 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 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 first blue light emitting unit 100 directly emits light from the blue light LED chip, and emits blue light with a peak wavelength of 455-475 nm. The spectrum of which is labeled B _1 in fig. 3.

The second blue light emitting unit 500 directly emits light by the blue light LED chip, and emits blue light with a peak wavelength of 445-455 nm. The spectrum of which is labeled B _2 in fig. 3.

The first and second blue

light emitting units

100 and 500 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. In order to ensure such a superposition effect, in a preferred embodiment, the peak wavelengths of the two LED chips should be within a given range, so that the difference between the two wavelengths is greater than or equal to 5 nm. Except for the first blue light emitting unit 100 and the second blue light emitting unit 500, the other light emitting units in this embodiment are all light emitters that emit light by exciting phosphors by blue light LED chips, where the blue light LED chips may be the same as any of the above two, or may select blue light LED chips with different peak wavelengths respectively, so that the energy of the whole blue light band may 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 blue light emitting unit 600 includes a blue LED chip and a package containing a phosphor including a blue phosphor, in this embodiment, cyan phosphorThe fluorescent powder is (Ba, Ca) Si₂N₂O₂Eu, the phosphor is excited by the blue LED chip, converting most of the blue light into cyan light with longer wavelength. The peak wavelength of the light emitted by the cyan light emitting unit 600 is at 475-505nm, the half width of the spectrum is 20-60nm, and the spectrum thereof 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 blue LED chip is converted into cyan light by the phosphor, the blue light content in the light emitted by the cyan light emitting unit 600 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 first green light emitting unit 200 comprises a blue LED chip 201 and a package 202, the package 202 contains a phosphor 203, the phosphor 203 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 203 is excited by the blue LED chip 201, converting most of the blue light into green light of longer wavelength. The peak wavelength of the light emitted by the first green light-emitting unit 200 is at 515-535nm, the half width of the spectrum is 90-130nm, and the spectrum is labeled as G _1 in FIG. 3. The light color is green, and is located in a quadrilateral region surrounded by four points of (0.37, 0.50), (0.37, 0.58), (0.30, 0.65), and (0.30, 0.57) on the 1931 CIE chromaticity diagram, i.e., the region D2 marked in fig. 4. Since most of the energy emitted from the blue LED chip 201 is converted into green light by the phosphor 203, the blue light content in the light emitted from the first green light-emitting unit 200 is less than 15%.

The second green light emitting unit 300 comprises a blue LED chip 301 and a package 302, 3 the package 202 contains a phosphor 203, the phosphor 203 contains a green phosphor, 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. Fluorescent lampThe light body 303 is excited by the blue LED chip 302, converting most of the blue light into green light having a longer wavelength. The peak wavelength of the light emitted by the second green light emitting unit 300 is 535-535nm, the half width of the spectrum is 90-130nm, and the spectrum is labeled as G _2 in FIG. 3. The light color is green, and is located in a quadrilateral region surrounded by four points (0.42, 0.48), (0.42, 0.57), (0.37, 0.62), (0.37, 0.53) on the 1931 CIE chromaticity diagram, i.e., the region D3 marked in fig. 4. Since most of the energy emitted from the blue LED chip 301 is converted into green light by the phosphor 303, the blue light content in the light emitted from the first green light-emitting unit 300 is less than 15%.

Although the respective half widths of the spectra of the first green light emitting unit 200 and the second green light emitting unit 300 are wider, the whole green light band range is wider, and the green light emitting units with two different peak wavelengths are adopted, so that the energy distribution in the whole area can be further uniform, and the whole color rendering property and color tunable capability of the light source module are improved. In a preferred embodiment, the peak wavelengths of the two green light-emitting units should be within a given range, so that the difference between the two wavelengths is 10nm or more.

The yellow light emitting unit 700 includes a blue LED chip and a package, the package contains a phosphor, the phosphor 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, or a combination thereof, and the phosphor is excited by the blue LED chip to convert most of the blue light into yellow light of longer wavelength. The yellow light-emitting unit 700 emits light with a peak wavelength at 555-580nm and a half-width at 100-150nm, and the spectrum is denoted as Y in FIG. 3. The light color is yellow, and is located in a quadrilateral region surrounded 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 D4 marked in fig. 4, because most of the energy emitted by the blue LED chip is converted into yellow light by the phosphor, the blue light content in the light emitted by the yellow light-emitting unit 700 is less than 10%.

A first red light emitting unit 400 including a blue LED chip 401 and a package 402, the package 402 contains a phosphor 403, the phosphor 403 includes a red phosphor, the red phosphor is CaAlSiN in this embodiment₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination. Phosphor 403 is excited by blue LED chip 402 to convert most of the blue light to longer wavelength red light. The peak wavelength of the light emitted by the first red light emitting unit 400 is 615-640nm, the half width of the spectrum is 60-100nm, and the spectrum is labeled as R _1 in FIG. 3. The light color is red, and is located in a quadrilateral region surrounded by four points of (0.70, 0.30), (0.64, 0.36), (0.64, 0.34), (0.70, 0.28) on the 1931 CIE chromaticity diagram, i.e., the region D5 marked in fig. 4. Since most of the energy emitted from the blue LED chip 401 is converted into red light by the phosphor 403, the blue light content in the light emitted from the first red light emitting unit 800 is less than 5%.

The second red light emitting unit 800 includes a blue LED chip and a package, wherein the package contains a phosphor, the phosphor includes a red phosphor, and the red phosphor is CaAlSiN in this embodiment₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination. The phosphor is excited by the blue LED chip to convert most of the blue light to longer wavelength red light. The peak wavelength of the light emitted by the second red light emitting unit 800 is located at 640-660nm, the half width of the spectrum is 60-100nm, and the spectrum is labeled as R _2 in FIG. 3. The light color is red, and is located in a quadrilateral region surrounded by four points of (0.70, 0.30), (0.64, 0.36), (0.64, 0.34), (0.70, 0.28) on the 1931 CIE chromaticity diagram, i.e., the region D5 marked in fig. 4. Since most of the energy emitted from the blue LED chip is converted into red light by the phosphor, the blue light content in the light emitted from the second red light emitting unit 800 is less than 5%.

Like the green light band, although the half widths of the respective spectra of the first red light emitting unit 400 and the second red light emitting unit 800 are wider, the range of the whole red light band is wider, and the two red light emitting units with different peak wavelengths are adopted, so that the energy distribution in the whole area is further uniform, and the whole color rendering property and color tunable capability of the light source module are improved. In a preferred embodiment, the peak wavelengths of the two red light emitting units should be within a given range, and the difference between the two wavelengths should be 15nm or more.

The spectral energy distribution of the light emitting units is shown in fig. 3, and by performing dimming control on them, the light source module in this embodiment can emit light of various colors, and the color temperature coverage range when synthesizing white light is wide, which can be from 2000K to 20000K, and the color rendering index CRI in the color temperature range is greater than 90. When the white light for daily illumination, namely the color temperature is 2700-.

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 various light colors, and the adjustable range of color temperature is from 2000-. 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 conventional white light source module, RGB three-color mixing is usually adopted, but the half-width of the spectrum of each of the three monochromatic light sources is limited, so that the energy is not uniformly distributed in the whole spectrum, and the energy of some bands is insufficient, thereby causing the problem of insufficient color rendering property.

The duty ratios of the PWM signals of the four light emitting units at different color temperatures, and the color rendering index CRI and the color deviation Duv of the correlated color temperature are listed in table 1 when only four light emitting units are used. The relative spectra of the light source module 1 at each target color temperature listed in table 1 are shown in fig. 7a and 7 b. Wherein, W1 in FIG. 7a corresponds to 1600K, W2 to 2000K, and W3 in FIG. 7b corresponds to 7000K, W4 to 20000K. The color temperature value is a target color temperature, and the actual value at the determined target color temperature has a slight deviation due to the difference of the product individuals, 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 further described below.

TABLE 1

As can be seen from table 1, compared to the existing RGB light mixing scheme, since one more green light emitting unit is used, the color rendering property is significantly improved. Except for the color rendering property of less than 90 at 1600K, the color temperatures are all at 90, and the distribution locus of the color point of the corresponding white light can completely follow the radiation line of the black body, the color deviation is small, and the color deviation Duv can be controlled within 0.001 or even lower. Fig. 6 shows a corresponding relationship between color rendering and white light at different color temperatures obtained by mixing light with only the above four light emitting units, except for the four color temperatures of the above table. It can be seen that mixing light with four light emitting units can ensure a display index CRI above 90 in a color temperature range of 2000K to 20000K.

Although the CRI is above 90, a good color rendering effect can be achieved, but the performance can be further improved in this embodiment, and the specific method is to adopt more light-emitting units to participate in light emission, so as to further balance the distribution of spectral energy of each wavelength band, thereby realizing a full spectrum. Table 2 lists the duty ratios of the PWM signals when the 8 light emitting units participate in light emission in common, and the color rendering index CRI and the color deviation Duv of mixing light to obtain white light of each color temperature. As shown in the table, the common participation in light emission does not mean that all 8 light emitting units emit light at the same time at each color temperature, and since there is participation of the cyan light emitting unit 600 and the yellow light emitting unit 700, it is not necessary that two green light emitting units emit light at the same time, and a green light emitting unit which is currently matched may be selected according to the color temperature.

TABLE 2

The relative spectra at the various color temperatures in table 2 are shown in fig. 5a, 5b, 5c, where a1, a2, A3 correspond to target color temperatures 2700K, 3000K, 3500K, respectively, in fig. 5 a; a4, a5, a6 in fig. 5b correspond to target color temperatures 4000K, 4500K, 5000K, respectively; in fig. 5c, a7 and A8 correspond to target color temperatures 5700K and 6500K, respectively. The color temperature range of the above table is between 2700-. In table 2, the CRI of each color temperature at 2700-.

The lighting system of the embodiment can control the light source module 1 to realize the white light with high color rendering, and can also realize some previous white lights with specific functions.

In utility model CN209859973U, a light source of LED white light (5000K) with high luminous efficiency, high CS value and high color rendering is proposed. The illumination product is known to have an influence on the physiological rhythm of a human body, and the influence can be evaluated through a diurnal stimulation (CS) evaluation model, namely the CS value is known in the industry, the spectrum with a high CS value can improve the concentration of people, and the illumination product is particularly suitable for people to concentrate on the attention to study and work under the same illumination. In the past, we needed to customize a special chip to realize this specific light source, and this embodiment can realize similar effects to the patent by giving specific PWM signals to 8 light emitting units, as shown in table 3.

TABLE 3

The light emitting units are controlled according to the PWM duty ratios listed in the above table, the light emitting relative color temperature of the light source module 1 is 4994K, the color point coordinates (0.3452, 0.3513) on the CIE color space, the color rendering index CRI is 96, and the diurnal stimulus CS is 0.430. The comparison of the spectrum and the target spectrum is shown in fig. 8a, where B1 is the spectrum obtained by the light source module 1 in this embodiment, and the target spectrum 1 is the spectrum disclosed in CN 209859973U.

The utility model discloses a another kind of different colour temperature, LED light source that has high light efficiency, high CS value, high color rendering of colour temperature 4000K is proposed in utility model patent CN 209496889U. Similar effects to those of the patent can be achieved by giving the PWM signals shown in table 4 to 8 light emitting units.

TABLE 4

The light emitting units are controlled according to the PWM duty ratios listed in the above table, the light emitting relative color temperature of the light source module 1 is 4028K, the color point coordinates (0.3790, 0.3750) on the CIE color space, the color rendering index CRI is 97, and the diurnal stimulus value CS is 0.350. The comparison of the spectrum and the target spectrum is shown in fig. 8B, wherein B2 is the spectrum obtained by the light source module 1 in this embodiment, and the target spectrum 2 is the spectrum disclosed in CN 209496889U.

A skin-beautifying light source capable of improving the skin color effect is proposed in utility model patent CN 206877994U. The look and feel of the skin color is greatly influenced by the illumination environment, and the unsuitable illumination environment can make the look and feel of the skin color worse, thereby reducing the personal image. The PS value is a parameter index for evaluating the skin color of the Asian female by the illuminating light source, and the higher the PS value is, the better the reduction degree and the authenticity of the skin of the Asian female by the light are. The light source provided by the patent can realize a high PS value, in the past, we need to customize a special chip to realize the special light source, and this embodiment can realize similar effects to the patent by giving a specific PWM signal to 8 light-emitting units, as shown in table 5.

TABLE 5

The light emitting units are controlled according to the PWM duty ratio listed in the table, the relative color temperature of the light emitted by the light source module 1 is 4028K, the color deviation Duv is-0.005, the color rendering index CRI is 92, and the PS value is 100. The comparison of the spectrum and the target spectrum is shown in fig. 8c, where B3 is the spectrum obtained by the light source module 1 in this example, and the target spectrum 3 is the spectrum disclosed in CN 206877994U.

In patent CN106958759B, a light source suitable for the elderly is proposed. The patent describes the relation that three visual photoreceptor cell response curves change along with the age according to technical reports CIE170-1-2006 and CIE170-2-2015 of the International Commission on illumination (CIE), so that the visual photoreceptor cell response curve of an old person aged 65 or above 65 is determined, and the spectral characteristics of a light source are determined according to the determined visual photoreceptor cell response curve of the old person, so that irradiation light emitted by the light source can be matched with the visual photoreceptor cell response curve of the old person, and further the eye color discrimination capability, the comfort level and the reading accuracy of the old person under the illumination are improved. In the past, we needed to customize a special chip to realize this specific light source, and this embodiment can realize similar effects to the patent by giving specific PWM signals to 8 light emitting units, as shown in table 6.

TABLE 6

The light emitting units are controlled according to the PWM duty ratios listed in the above table, the light source module 1 has a relative color temperature of 4971K, color point coordinates (0.3459, 0.3522) on the CIE color space, and a color rendering index CRI of 91. The comparison of the spectrum and the target spectrum is shown in fig. 8d, where B4 is the spectrum obtained by the light source module 1 in this embodiment, and the target spectrum 4 is the spectrum disclosed in CN 106958759B.

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, and some possible color generation manners are exemplarily shown in table 7, in which the PWM of the light emitting unit under various colors and the color point coordinates (Cx, Cy) on the CIE color space are shown.

TABLE 7

In table 7, the relative spectra of the three colors in the violet color system are shown in fig. 9a, the relative spectra of the three colors in the blue color system are shown in fig. 9, and the distribution of the color points of the colors on the CIE 1931 chromaticity diagram is shown in fig. 10.

In summary, the light source module and the illumination system provided in the present application can realize color matching in the maximum range by optimizing the combination of the monochromatic light emitting units with specific spectral characteristics, and mix the illumination white light with good color rendering property, the illumination output with specific functions, and the color lights 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. 12 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 first blue light emitting unit 100, the second blue light emitting unit 500, the cyan light emitting unit 600, the first green light emitting unit 200, the second green light emitting unit 300, the yellow light emitting unit 700, the first red light emitting unit 400 and the second red light emitting unit 800 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 with each other 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 8 light emitting units which are electrically independent from each other, wherein the light emitting units respectively comprise:

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

2. The light source module of claim 1, wherein a difference between a peak wavelength of the first blue light emitting unit and a peak wavelength of the second blue light emitting unit is greater than or equal to 5 nm;

3. The light source module as claimed in claim 2, 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 of claim 1, 2 or 3, wherein each of the light emitting units comprises a blue LED chip and a package covering the blue LED chip, and wherein the cyan light emitting unit, the first green light emitting unit, the second green light emitting unit, the yellow light emitting unit, the first red light emitting unit and the second red light emitting unit further comprise a phosphor configured to be excited by the blue LED chip to convert a portion of light emitted by the blue LED chip to longer-wavelength light.

5. The light source module of claim 4, wherein the blue light content of the cyan light emitting unit and the yellow light emitting unit is less than 10%, the blue light content of the first green light emitting unit and the second green light emitting unit is less than 15%, and the blue light content of the first red light emitting unit and the second red light emitting unit is less than 5%.

6. 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。

7. The light source module as claimed in claim 4, wherein the phosphors in the first green light emitting unit and the second green light emitting unit comprise green phosphor, and the green phosphor is (Lu, Yb, Tb)₃(Al, Ga)₅O₁₂:Ce、Ga-Y₃Al₅O₁₂At least one of Ce, beta-SiAlON and Eu or their combination.

8. The light source module of claim 4, wherein the phosphor in the yellow light emitting unit comprises a yellow phosphor, and the yellow phosphor is Y₃(Al,Ga)₅O₁₂:Ce、(Ba,Sr,Ca,Mg)SiO₄:Eu、(Ba,Sr,Ca,Mg)₂Si₂O₂N₂At least one of Eu or their combination.

9. The light source module as claimed in claim 4, wherein the phosphors in the first and second red light emitting units comprise red phosphor, and the red phosphor is CaAlSiN₃:Eu、(Ca,Sr)AlSiN₃:Eu、(Ba,Sr,Ca,Mg)₂Si₅N₈At least one of Eu or their combination.

10. The light source module of claim 4, wherein the light source module is a package 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 blue light LED chips are respectively disposed in the receiving slots and respectively provided with a pair of pins, the pins are electrically isolated from each other, and in the first blue light emitting unit and the second blue light emitting unit, the receiving slots directly filled by the package body cover the blue light LED chips; the packaging body and the fluorescent body in the cyan light emitting unit, the first green light emitting unit, the second green light emitting unit, the yellow light emitting unit, the first red light emitting unit and the second red light emitting unit are mixed and then filled in the containing groove and cover the blue light LED chip.

11. The light source module of claim 1, 2 or 3, wherein the light source module emits light from the first blue light emitting unit, the first green light emitting unit, the second green light emitting unit and the first red light emitting unit to mix white light with a color temperature ranging from 2000K to 20000K, and a color rendering index CRI in the color temperature range is greater than 90.

12. The light source module as claimed in claim 1, 2 or 3, wherein the light emitting units of the light source module mix light to obtain white light, and when the color temperature of the emitted white light is 2700-.

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

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

the control module generates a control signal;

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

16. The lighting system of claim 14, wherein the control module comprises a communication module for receiving externally transmitted dimming/toning commands and generating the control signal accordingly.

17. The illumination system of claim 14, wherein the control module comprises a storage module storing preset control parameter values, the control parameter values are corresponding control parameter values 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 parameter values to generate the control signals.

18. The illumination system as recited in claim 17, wherein the light source module is controlled according to the control parameter values, and a color rendering index CRI of the obtained white light is greater than 90 in the color temperature range of 2000-20000K, and greater than 95 in the color temperature range of 2700-6500K.

19. The illumination system of claim 14, 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 13 to 19.