LED mixed spectrum white light source

Abstract

An LED mixed spectrum white light source, comprising red light LED lamp beads (11), green light LED lamp beads (12), blue light LED lamp beads (13) and white light LED lamp beads (14) which are independently controlled. The peak wavelength of the red light LED lamp beads (11) is between 635 nm and 660 nm, the main peak wavelength of the blue light LED lamp beads (13) is between 445 nm and 465 nm, the peak wavelength of the white light LED lamp beads (14) is between 580 nm and 620 nm, and the peak wavelength of the green LED lamp beads (12) is between 510 nm and 530 nm or between 500 nm and 540 nm. In this way, the dimming of white light within a color temperature range of 2,000-20,000 K is realized, Ra is higher than 96 in a color temperature range of 2,500-10,000 K, and the TLCI index is higher than 93 in a color temperature range of 2,500-2,900 K, and is higher than 95 in a color temperature range of 3,000-20,000 K.

Description

LED mixed spectrum white light source

[0001] The present application claims priority to the Chinese patent application No. 202421487389.2, filed on June 26, 2024, to the Chinese patent application No. 202411187076.X, filed on August 27, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the field of lighting technology, in particular to a LED mixed spectrum white light source. BACKGROUND

[0003] LED light source is widely used in household lighting, commercial lighting, stage lighting, film and television shooting, theater studio lighting, museum lighting, medical lighting and plant growth lighting fields. With the emphasis on the comfort of the lighting environment and the display effect of white light, the requirements for the color temperature range, CRI (color rendering index) and TLCI (television lighting consistency index) of LED white light source are getting higher and higher, especially the TLCI index, which usually needs to be greater than 90 when lighting in film and television lighting. The white light emitted by the LED light source with colored beads is composed of multiple color lights, and the quality of the final combined white light is different in different color spectrum combinations. The existing spectrum combination cannot meet the increasing demand. SUMMARY

[0004] The purpose of the present application is to provide a LED mixed spectrum white light source, which aims to solve the technical problem that the quality of the combined white light produced by the existing LED white light source needs to be further improved.

[0005] The present application provides a LED mixed spectrum white light source, which comprises independently controlled red light LED beads, green light LED beads, blue light LED beads and white light LED beads, the peak wavelength of the red light LED beads is between 635nm and 660nm, the main peak wavelength of the blue light LED beads is between 445nm and 465nm, and the peak wavelength of the white light LED beads is between 580nm and 620nm.

[0006] The green light LED beads are green light chips, and the peak wavelength of the green light chips is between 510nm and 530nm; or the green light LED beads comprise first light emitting chips and first phosphor powder covering the first light emitting chips, and the peak wavelength of the first phosphor powder is between 500nm and 540nm.

[0007] In one of the embodiments, when the green LED lamp bead is the green chip, the peak wavelength of the red LED lamp bead is between 640nm and 660nm; when the green LED lamp bead comprises the first light emitting chip and the first phosphor powder, the peak wavelength of the red LED lamp bead is between 635nm and 650nm.

[0008] In one of the embodiments, when the green LED lamp bead is the green chip, the spectrum of the red LED lamp bead comprises a first wave band with a wavelength less than 630nm and a wavelength greater than 678nm, and the intensity of the first wave band is less than or equal to 80% of the intensity of the peak wavelength of the red LED lamp bead.

[0009] In one of the embodiments, when the green LED lamp bead comprises the first light emitting chip and the first phosphor powder, the spectrum of the red LED lamp bead comprises a second wave band with a wavelength less than 621nm and a wavelength greater than 663nm, and the intensity of the second wave band is less than or equal to 80% of the intensity of the peak wavelength of the red LED lamp bead.

[0010] In one of the embodiments, the light emitted by the blue LED lamp bead further comprises a secondary peak with a wavelength of 400nm to 420nm.

[0011] In one of the embodiments, when the green LED lamp bead is the green chip, the intensity of the secondary peak of the blue LED lamp bead is less than 65% of the intensity of the peak wavelength of the blue LED lamp bead.

[0012] In one of the embodiments, when the green LED lamp bead comprises the first light emitting chip and the first phosphor powder, the intensity of the secondary peak of the blue LED lamp bead is 90% to 100% of the intensity of the peak wavelength of the blue LED lamp bead.

[0013] In one of the embodiments, the blue LED lamp bead comprises a first lamp bead, a second lamp bead and a third lamp bead, the peak wavelength of the first lamp bead is 400nm to 410nm, the peak wavelength of the second lamp bead is 445nm to 455nm, and the peak wavelength of the third lamp bead is 455nm to 465nm.

[0014] In one of the embodiments, the power ratio of the first lamp bead, the second lamp bead and the third lamp bead is 4:5:3.

[0015] In one of the embodiments, the intensity of the wavelength of 550nm to 650nm of the white LED lamp bead is greater than or equal to 60% of the intensity of the peak wavelength of the white LED lamp bead.

[0016] In one of the embodiments, when the green LED lamp bead is the green chip, the luminance ratio of the red LED lamp bead, the green LED lamp bead, the blue LED lamp bead and the white LED lamp bead is 1.8-2.0:5.5-5.6:1:15-16.

[0017] In one of the embodiments, when the green LED lamp bead includes the first light emitting chip and the first phosphor, the luminance ratio of the red LED lamp bead, the green LED lamp bead, the blue LED lamp bead and the white LED lamp bead is 1.8-2.0:12-13:1:14-15.

[0018] In one of the embodiments, the red LED lamp bead includes a second light emitting chip and a second phosphor covering the second light emitting chip, and the peak wavelength of the second phosphor is between 635 nm and 660 nm.

[0019] In one of the embodiments, the white LED lamp bead includes a third light emitting chip and a third phosphor covering the third light emitting chip, and the peak wavelength of the third phosphor is between 580 nm and 620 nm.

[0020] In one of the embodiments, the third light emitting chip is the same as the second light emitting chip.

[0021] In one of the embodiments, the third phosphor includes green phosphor, orange phosphor and red phosphor.

[0022] In one of the embodiments, the color temperature of the light emitted by the white LED lamp bead ranges from 2850 K to 3250 K.

[0023] In one of the embodiments, the Duv of the light emitted by the white LED lamp bead ranges from +0.005 to +0.015.

[0024] The LED mixed spectrum white light source provided by the application has the following advantages: the red light LED lamp bead, the green light LED lamp bead, the blue light LED lamp bead and the white light LED lamp bead are independently controlled to emit light, mixed light forms white light with adjustable color temperature, and the white light is adjusted in the color temperature range of 2000K-20000K; compared with the white light synthesized by three colors, the white light synthesized by four colors has a larger color gamut range on a chromaticity diagram, the coordinate point is more flexible and accurate, and is basically consistent or completely consistent with natural white light, so that the color rendering index CRI Ra is higher than 96 in the range of 2500-10000K; compared with the white light synthesized by five colors or more than five colors, the number of lamp beads and the number of driving lines are small, which is beneficial to the miniaturization and light weight of the white light source; the peak wavelength of the red light LED lamp bead, the blue light LED lamp bead and the white light LED lamp bead is between 635nm-660nm, 445nm-465nm and 580nm-620nm respectively, the white light LED lamp bead provides white light including a part of the blue light and the green light, which is beneficial to improving the TLCI index, the peak wavelength of the green light LED lamp bead is between 510nm-530nm or 500nm-540nm, the four-color spectrum mixing design reduces color deviation and fluctuation, the TLCI index is higher than 93 in the color temperature range of 2500K-2900K, and is higher than 95 in the color temperature range of 3000K-20000K, which solves the technical problem that the quality of the synthesized white light of the existing LED white light source needs to be further improved, and simultaneously meets the high requirements of the color temperature range, the color rendering index and the TLCI index. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a first spectrum combination diagram of the LED mixed spectrum white light source provided by the embodiment of the present application;

[0027] Fig. 2 is a second spectrum combination diagram of the LED mixed spectrum white light source provided by the embodiment of the present application;

[0028] Fig. 3 is a light quality parameter diagram of the LED mixed spectrum white light source provided by the embodiment of the present application;

[0029] Fig. 4 is a light quality parameter diagram in the related art;

[0030] Fig. 5 is a structure schematic diagram of the LED mixed spectrum white light source provided by the embodiment of the present application;

[0031] Fig. 6 is another structural schematic diagram of the LED mixed spectrum white light source according to an embodiment of the present application;

[0032] Fig. 7 is a circuit schematic diagram of the LED mixed spectrum white light source according to an embodiment of the present application.

[0033] In the drawings: 1, light emitting surface; 11, red LED lamp bead; 12, green LED lamp bead; 13, blue LED lamp bead; 131, first lamp bead; 132, second lamp bead; 133, third lamp bead; 14, white LED lamp bead; 2, first substrate; 3, second substrate; 31, thermistor; 32, wiring socket; 4, control unit; 41, first driving circuit; 42, second driving circuit; 43, third driving circuit; 44, fourth driving circuit. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar notations are used to denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as limiting the present application.

[0035] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearance of the phrases "in one embodiment" or "in some embodiments" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0036] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In some lighting fields, such as photographic fill light illumination, stage lighting, theater studio lighting and the like, the TLCI index requirement of white light source is higher and higher, and is usually required to be greater than 90, even greater than 95 or more in film and television lighting fill light. At the same time, in the field of photographic fill light and stage lamp lighting, the light source and lamp are mostly rented, and need to be moved or moved frequently, so the portability of the light source is required to be higher, and therefore the volume and weight of the light source are required to be smaller.

[0040] In combination with FIGS. 1, 2, 5 and 6, the present application provides a LED mixed spectrum white light source. The LED mixed spectrum white light source comprises red light LED lamp beads 11, green light LED lamp beads 12, blue light LED lamp beads 13 and white light LED lamp beads 14 which are independently controlled respectively. The light emitted by the red light LED lamp beads 11, the green light LED lamp beads 12, the blue light LED lamp beads 13 and the white light LED lamp beads 14 is mixed to form white light with adjustable color temperature, so as to realize the dimming of white light in the color temperature range of 2000K-20000K.

[0041] In FIGS. 1 and 2, the arrow B points to the spectrum curve of the blue light LED lamp beads 13, the arrow G points to the spectrum curve of the green light LED lamp beads 12, the arrow W points to the spectrum curve of the white light LED lamp beads 14, and the arrow R points to the spectrum curve of the red light LED lamp beads 11. In the present embodiment, the peak wavelength of the red light LED lamp beads 11 is between 630nm and 660nm, the main peak wavelength of the blue light LED lamp beads 13 is between 445nm and 465nm, and the peak wavelength of the white light LED lamp beads 14 is between 580nm and 620nm.

[0042] In some embodiments, in combination with FIG. 1, the green light LED lamp beads 12 can be a green light chip directly, and the peak wavelength of the green light chip is between 510nm and 530nm. In other embodiments, in combination with FIG. 2, the green light LED lamp beads 12 comprise a first light emitting chip and a first phosphor powder covering the first light emitting chip, and the peak wavelength of the first phosphor powder is between 500nm and 540nm.

[0043] Therefore, the peak wavelength of the red LED lamp bead 11, the blue LED lamp bead 13 and the white LED lamp bead 14 is respectively between 630nm-660nm, 445nm-465nm and 580nm-620nm, and the peak wavelength of the green LED lamp bead 12 is between 510nm-530nm or 500nm-540nm. Compared with the white light synthesized by three colors, the color gamut range of the white light synthesized by four colors is larger on the chromaticity diagram, the coordinate point is more flexible and accurate, and is basically consistent or completely consistent with the natural white light. Referring to FIG. 3, the Ra of the color rendering index CRI is higher than 96 in the range of 2500K-10000K. FIG. 3 is a light quality parameter diagram of the LED mixed spectrum white light source, including the average quality parameter test results of the green LED lamp bead 12 as a green light chip and the green LED lamp bead 12 including the first light emitting chip and the first fluorescent powder. Compared with the white light synthesized by five colors or more than five colors, the light color type of the LED lamp bead in the present application is less, and the driving channel is less. Therefore, the manufacturing cost is reduced, and the LED mixed spectrum white light source is miniaturized and lightened, and the portability is improved. Referring to FIG. 3, the four-color spectrum mixing and superposition provided in the present application reduces the white light deviation and fluctuation. Meanwhile, the white light generated by the white LED lamp bead 14 includes part of the wave band of the blue light and the green light, which is beneficial to improve the TLCI index. The TLCI index is higher than 93 in the color temperature range of 2500K-2900K, and is higher than 95 in the color temperature range of 3000K-20000K. The color temperature range, the color rendering index and the TLCI index are considered, and the high requirements of the TLCI index in the photography lighting field are met.

[0044] In the art, the Ra of the color rendering index CRI is higher than 96 in the range of 2500K-10000K, and there are countless four-color spectrum combination schemes. The TLCI index is higher than 93 in the color temperature range of 2500K-2900K, and there are also countless four-color spectrum combination schemes. It is difficult to directly derive the spectrum combination that meets both indexes. In the related design, if the white LED lamp bead 14 of the LED mixed spectrum white light source provided in the present application is replaced by a yellow LED lamp bead, the peak wavelength of the yellow LED lamp bead is 570nm-590nm, and in combination with FIG. 4, the TLCI index is lower than 90 in the color temperature range of 2500K-2900K, and is lower than 95 in the color temperature range of 2900K-20000K, which cannot meet the TLCI requirement of the photography lighting. Similarly, in other schemes, replacing any one of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14, or modifying the peak wavelength of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14, it is difficult to simultaneously consider the color rendering index and the TLCI index.

[0045] In some embodiments, the first light emitting chip is a blue light chip, and the first phosphor is a green light phosphor. The blue light chip has a high light emitting efficiency, and after being combined with the green light phosphor, a high luminous flux output can be achieved, and the illumination efficiency is improved.

[0046] In some embodiments, in combination with FIG. 1 and FIG. 5, when the green light LED lamp bead 12 is a green light chip, the peak wavelength of the green light LED lamp bead 12 is between 510 nm and 530 nm, and the peak wavelength of the red light LED lamp bead 11 is between 640 nm and 660 nm. The green light LED lamp bead 12 directly emits green light by using a green light chip, and the wave band is narrow and left-biased. At this time, the peak wavelength of the red light LED lamp bead 11 is set to be between 640 nm and 660 nm, and the red light wave band is right-biased, so as to ensure that the mixed white light can more accurately restore the color of the surface of an object, has a high color rendering index, and helps to reduce the deviation and fluctuation of light in the mixing process, thereby improving the TLCI index.

[0047] In some other embodiments, in combination with FIG. 2 and FIG. 5, when the green light LED lamp bead 12 includes the first light emitting chip and the first phosphor, the peak wavelength of the green light LED lamp bead 12 is between 500 nm and 540 nm, and the peak wavelength of the red light LED lamp bead 11 is between 635 nm and 650 nm. Since the composition of the first phosphor is complex, the wavelength will be subjected to Stokes shift, thereby widening the spectrum and the peak wavelength range of the green light LED lamp bead 12, and the spectrum of the red light LED lamp bead 11 is slightly right-biased, so as to ensure that the mixed white light has a high color rendering index and TLCI index.

[0048] In some embodiments, in combination with FIG. 1 and FIG. 5, when the green light LED lamp bead 12 is a green light chip, the spectrum of the red light LED lamp bead 11 includes a first wave band with a wavelength less than 630 nm and a wavelength greater than 678 nm (see the ordinate of FIG. 1), and the intensity of the first wave band is less than or equal to 80% of the intensity of the peak wavelength of the red light LED lamp bead 11. The intensity of the non-peak wavelength of the red light is limited, the spectrum distribution is optimized, the stray light is reduced, the light is more pure and the color is more saturated, which is conducive to improving the TLCI index on the one hand and concentrating the energy on the peak wavelength and reducing the energy loss on the other hand.

[0049] In some other embodiments, in combination with FIG. 2 and FIG. 5, when the green light LED lamp bead 12 includes the first light emitting chip and the first phosphor, the spectrum of the red light LED lamp bead 11 includes a second wave band with a wavelength less than 621 nm and a wavelength greater than 663 nm (see the ordinate of FIG. 2), and the intensity of the second wave band is less than or equal to 80% of the intensity of the peak wavelength emitted by the red light LED lamp bead 11. The intensity of the non-peak wavelength of the red light is limited, the spectrum distribution is optimized, the stray light is reduced, the light is more pure and the color is more saturated, which is conducive to improving the TLCI index on the one hand and concentrating the energy on the peak wavelength and reducing the energy loss on the other hand.

[0050] In some embodiments, in combination with FIG. 1, FIG. 2 and FIG. 5, the light emitted by the blue light LED lamp bead 13 also includes a secondary peak value with a wavelength of 400nm-420nm, achieving a wider spectral coverage, so that the mixed generated white light is closer to the spectral characteristics of natural light, to improve the color rendering index and TLCI index.

[0051] In one of the embodiments, when the green light LED lamp bead 12 is a green light chip, because the green light chip produces concentrated green light energy with narrow spectrum, the intensity of the secondary peak value of the blue light LED lamp bead 13 is less than 65% of the intensity of the peak wavelength emitted by the blue light LED lamp bead 13, which can balance the narrow bandwidth spectrum of green light and maintain the improved color rendering index and color reproduction ability of the white light source.

[0052] In another embodiment, when the green light LED lamp bead 12 includes a first light emitting chip and a first phosphor, the green light LED lamp bead 12 produces green light with wide spectral bandwidth, and the intensity of the secondary peak value of the blue light LED lamp bead 13 is 90%-100% of the intensity of the peak wavelength emitted by the blue light LED lamp bead 13, which can balance the wide bandwidth spectrum of green light and maintain the improved color rendering index and color reproduction ability of the white light source.

[0053] In this embodiment, the blue light LED lamp bead 13 can be composed of one or more than one color lamp bead, that is, the blue light LED lamp bead 13 can be composed of at least one color lamp bead of blue light, purple light and ultraviolet light with different spectral bands in proportion. The at least one color lamp bead can be connected in series or in parallel, and the same driving circuit is adopted.

[0054] In some embodiments, in combination with FIG. 5 and FIG. 7, the blue light LED lamp bead 13 includes a first lamp bead 131, a second lamp bead 132 and a third lamp bead 133, the peak wavelength of the first lamp bead 131 is 400nm-410nm, the peak wavelength of the second lamp bead 132 is 445nm-455nm, and the peak wavelength of the third lamp bead 133 is 455nm-465nm.

[0055] Based on this, the blue light LED lamp bead 13 can achieve wider spectral coverage by using three different peak wavelength blue light lamp beads, thereby significantly improving the spectral similarity index (SSI) index. For example, when the target color temperature is 3200K, the SSI reaches more than 90. The combination of different peak wavelengths makes the spectral distribution of the blue light LED lamp bead 13 closer to natural light, providing a more real and natural lighting environment for photography and other applications, so that the photographic works have more real color reproduction and higher detail performance. At the same time, the spectral distribution closer to natural light can reduce eye fatigue and discomfort, and improve the visual comfort of people.

[0056] In one embodiment, the power ratio of the different wavelength lamp beads is adjusted to adjust the spectral shape and intensity distribution of the blue LED lamp bead 13. The power ratio of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 is 4:5:3. The second lamp bead 132 provides blue light closer to pure blue, and the ratio is larger, which is conducive to achieving a larger color temperature and expanding the color temperature range. The power ratio range is conducive to flexibly adjusting the color temperature, brightness and spectral distribution of the blue LED lamp bead 13, and conducive to the white light source covering a wider spectrum while maintaining similar spectral characteristics to natural light, thereby improving the spectral similarity index of the white light source, optimizing the color rendering of the light source, and enhancing visual comfort.

[0057] In one embodiment, the peak wavelengths of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 are 407 nm, 452 nm and 460 nm, respectively. Since the wavelength 452 nm is closer to the center of pure blue, it is selected as the peak wavelength of the second lamp bead 132, and the first lamp bead 131 and the third lamp bead 133 are selected to have shorter (407 nm) and longer (460 nm) wavelengths, respectively, so that the spectral distribution of the entire blue LED lamp bead 13 is more extensive and uniform.

[0058] In some embodiments, the main peak wavelength of the blue LED lamp bead 13 is 445 nm to 465 nm, and the shorter wavelength blue light (close to 445 nm) is suitable for high brightness and high contrast application scenarios, while the longer wavelength blue light (close to 465 nm) is suitable for soft light application scenarios. For example, when the blue LED lamp bead 13 includes the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133, the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 are arranged in series to achieve a peak wavelength of the blue LED lamp bead 13 of 445 nm to 465 nm.

[0059] It can be understood that in one embodiment, the blue LED lamp bead 13 only selects one of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 to reduce the type of blue LED lamp bead 13 and reduce the number of components and the cost of white light source. In another embodiment, the blue LED lamp bead 13 is composed of two of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133, and through two different peak wavelengths of blue light, the configuration of the synthesized white light can be optimized to make the white light closer to natural light, and compared to using three different peak wavelength lamp beads, the type of lamp bead is reduced, and the manufacturing cost and control cost are reduced.

[0060] In some embodiments, the number of red light LED lamp beads 11, green light LED lamp beads 12, blue light LED lamp beads 13 and white light LED lamp beads 14 is multiple, and any one color LED lamp bead in the multiple red light LED lamp beads 11, the multiple green light LED lamp beads 12, the multiple blue light LED lamp beads 13 and the multiple white light LED lamp beads 14 can be selected to be arranged in series. The series arrangement reduces the number and complexity of the circuit in the circuit, making the wiring more concise and clear, which is beneficial to reduce the manufacturing difficulty and manufacturing cost, and the series current is the same, which reduces the abnormality of uneven brightness caused by uneven distribution of current in the circuit, and simplifies the control difficulty.

[0061] Specifically, the multiple red light LED lamp beads 11 are arranged in series, the multiple green light LED lamp beads 12 are arranged in series, the multiple blue light LED lamp beads 13 are arranged in series, and the multiple white light LED lamp beads 14 are arranged in series.

[0062] In other embodiments, the number of red light LED lamp beads 11, green light LED lamp beads 12, blue light LED lamp beads 13 and white light LED lamp beads 14 is multiple, and any one color LED lamp bead in the multiple red light LED lamp beads 11, the multiple green light LED lamp beads 12, the multiple blue light LED lamp beads 13 and the multiple white light LED lamp beads 14 forms at least two branches arranged in parallel, which is beneficial to reduce the current of each branch and improve the use safety. For example, the multiple red light LED lamp beads 11 form four branches, and each branch is composed of six red light LED lamp beads 11 arranged in series.

[0063] Specifically, the power of each branch is the same, so the current of each branch is the same, and the luminous intensity of each lamp bead is consistent. At this time, the types of lamp beads on the branch can be the same or different, and the number of lamp beads can be the same or different, as long as the power is the same, which is not limited herein.

[0064] In some embodiments, in combination with FIG. 7, the multiple blue light LED lamp beads 13 form multiple branches, each branch includes at least one of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133, and the multiple branches are connected in parallel with each other. When the overall power of the blue light LED lamp beads 13 is large, the multiple branches are arranged in parallel, which is beneficial to relatively uniformly distribute the total current to each branch, reduce the current flowing through each branch, and further reduce the current of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 in each branch, thereby improving the use safety.

[0065] In one of the embodiments, the second lamp bead 132 and / or the third lamp bead 133 are connected in series between the two first lamp beads 131 on the branch, i.e. the two first lamp beads 131 are not arranged adjacent to each other, which ensures that the first lamp beads 131 are arranged dispersedly, so that the spectral distribution of the branch is more uniform and extensive.

[0066] In one of the embodiments, the first light beads 131 and / or the third light beads 133 are connected in series between two second light beads 132 on the branch, i.e., the two second light beads 132 are not arranged adjacently, so as to ensure the second light beads 132 are arranged dispersedly, and make the spectral distribution of the branch more uniform and extensive.

[0067] In one of the embodiments, the first light beads 131 and / or the second light beads 132 are connected in series between two third light beads 133 on the branch, i.e., the two third light beads 133 are not arranged adjacently, so as to ensure the third light beads 133 are arranged dispersedly, and make the spectral distribution of the branch more uniform and extensive.

[0068] Specifically, each branch includes the first light beads 131, the second light beads 132 and the third light beads 133 arranged in series. In each branch, the number ratio of the first light beads 131, the second light beads 132 and the third light beads 133 is 1:1:1. On one hand, the light beads of the branch are of the same type and the same number, and the circuit design is more simple, which is conducive to reducing the manufacturing cost and the regulation cost; on the other hand, the power and the current of each branch are ensured to be the same, so as to realize the consistent light emitting brightness of each light bead, and make the spectral distribution more uniform and extensive.

[0069] In some embodiments, in combination with FIGS. 1 and 2, the intensity of the 550nm-650nm wavelength of the white light LED light bead 14 is greater than or equal to 60% of the intensity of the peak wavelength of the white light LED light bead 14, which expands the intensity of the red light and the cyan light in the white light, and is conducive to improving the TLCI index.

[0070] In one of the embodiments, when the green light LED light bead 12 is a green light chip, the spectrum of the green light LED light bead 12 includes a third wave band with a wavelength less than 505nm and a wavelength greater than 535nm, and the intensity of the third wave band is less than or equal to 60% of the intensity of the peak wavelength of the green light LED light bead 12, so as to quickly reduce the intensity of the non-peak wavelength and reduce the stray light.

[0071] When the green light LED light bead 12 includes the first light emitting chip and the first phosphor powder, the spectrum of the green light LED light bead 12 includes a fourth wave band with a wavelength less than 492nm and a wavelength greater than 585nm, and the intensity of the fourth wave band is less than or equal to 60% of the intensity of the peak wavelength of the green light LED light bead 12, so as to widen the spectral intensity of the green light LED light bead 12, and make the green light have a higher color rendering index and TLCI index.

[0072] In some embodiments, when the green LED lamp bead 12 is a green chip, the luminance ratio of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 is 1.8-2.0:5.5-5.6:1:15-16. Based on this, the luminance of the white LED lamp bead 14 is the highest, which ensures the luminance and white light output effect of the overall light source; the luminance of the green LED lamp bead 12 is relatively high, which highlights the color rendering effect of green; and the luminance of the red LED lamp bead 11 and the blue LED lamp bead 13 is low, which balances the overall light effect. Through testing, the white light source has high power consistency at different color temperatures, which is beneficial to energy efficiency optimization and can also improve the stability and reliability of the product. Therefore, such a luminance ratio setting can improve the color rendering index (CRI) of the light source, so that the color of the illuminated object is more natural. Especially in a white light environment, different colored LED lamp beads work together to produce high-quality white light.

[0073] Among them, the required luminance ratio can be achieved by selecting lamp beads with different luminance and power characteristics. Specifically, lamp beads with different light outputs (luminous flux) can be selected to achieve the required luminance ratio directly through the luminous flux difference of the lamp beads themselves. Or select lamp beads with different power, because lamp beads with different power will produce different luminance under the same current, so the required luminance ratio can be achieved.

[0074] In some embodiments, when the green LED lamp bead 12 includes a first light emitting chip and a first phosphor, the luminance ratio of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 is 1.8-2.0:12-13:1:14-15. Compared with the direct light emitting mode of the green LED lamp bead 12 as a green chip, the green LED lamp bead 12 in this embodiment emits green light by exciting the first phosphor layer with the first light emitting chip. The luminance of the green LED lamp bead 12 used is relatively high because if the luminance of the first light emitting chip is insufficient, the amount of light absorbed by the first phosphor will not be enough to produce sufficient re-emitted light. Therefore, in order to ensure that the first phosphor layer can effectively absorb and re-emit light, the green LED lamp bead 12 needs to use a first light emitting chip with relatively high luminance to provide stable and efficient light output. Therefore, such a luminance ratio setting can improve the overall light efficiency of the light source, while providing high-quality lighting while reducing energy consumption.

[0075] In the above two groups of luminance ratios, the blue LED lamp bead 13 plays a big role in the implementation of high color temperature, and a small role in the implementation of other color temperature values. By reducing its luminance ratio and power, on the one hand, the power waste of the blue LED lamp bead 13 is avoided, and on the other hand, the power of the white light source is basically consistent at different color temperatures, which is beneficial to energy efficiency optimization.

[0076] In some embodiments, the red LED lamp bead 11 includes a second light emitting chip and a second phosphor covering the second light emitting chip, and the peak wavelength of the second phosphor is between 635 nm and 660 nm. The peak wavelength of the second phosphor is stable in this range, which helps to ensure that the red LED lamp beads 11 produced under different batches and different production conditions are highly consistent in color, meeting the requirements of TLCI for high-end applications.

[0077] Optionally, the second light emitting chip is a blue light chip, which has high light emitting efficiency and can achieve high luminous flux output, thereby improving the lighting efficiency.

[0078] In some embodiments, the white LED lamp bead 14 includes a third light emitting chip and a third phosphor covering the third light emitting chip, and the peak wavelength of the third phosphor is between 580 nm and 620 nm. The peak wavelength of the third phosphor is stable in this range, which helps to ensure that the white LED lamp beads 14 produced under different batches and different production conditions are highly consistent in color, meeting the requirements of TLCI for high-end applications

[0079] Optionally, the third light emitting chip is a blue light chip, which has high light emitting efficiency and can achieve high luminous flux output, thereby improving the lighting efficiency.

[0080] Optionally, the third light emitting chip and the second light emitting chip are the same, reducing the types of materials.

[0081] Optionally, the third phosphor includes green phosphor, orange phosphor and red phosphor. In this way, by adjusting the composition and proportion of the third phosphor, the color temperature range of the output light of the white LED lamp bead 14 can be controlled, and a larger Duv range can be achieved, thereby enhancing the color rendering index.

[0082] In some embodiments, the color temperature range of the light emitted by the white LED lamp bead 14 is 2850 K to 3250 K, which can avoid the problem that the CRI and TLCI indexes of the mixed light of multiple single light LED lamp beads are low within the color temperature range of 2850 K to 3250 K.

[0083] In some embodiments, the Duv value represents the color difference between the color of the light source and the color of the black body radiation at the same color temperature. The Duv range of the light emitted by the white LED lamp bead 14 is +0.005 to +0.015, which ensures that the light emitted by the white LED lamp bead 14 has high stability and can reduce the color difference problem caused by color temperature fluctuation, so that the power is basically the same within the color temperature range. If the Duv is lower than +0.005, the light power within the color temperature range of 2850 K to 3250 K will be too high; if the Duv is higher than +0.015, the light power of the color temperature above 3250 K will be too high.

[0084] The red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 are all light-emitting lamp beads.

[0085] In some embodiments, the LED mixed spectrum white light source further comprises a first substrate 2 having a light-emitting surface 1, and the plurality of light-emitting lamp beads are mounted in the light-emitting surface 1. The first substrate 2 can be a metal substrate or a ceramic substrate.

[0086] In one embodiment, the light-emitting lamp bead can be one or more of a flip chip, a flip CSP, or a vertical chip. For example, the flip chip can provide better heat management capability because the LED chip is directly mounted on the first substrate 2, which can more effectively conduct heat. The flip CSP technology directly encapsulates the LED chip in a very small package, greatly reducing the volume and weight of the white light source. For another example, the vertical chip makes the light emission direction of the LED chip perpendicular to the first substrate 2, which is beneficial to the beam control and reflection management in optical design.

[0087] Therefore, by using the flip chip, the flip CSP or the vertical chip as the packaging structure of the LED lamp bead, the heat management requirement, the size limitation and the optical design requirement of the specific application can be optimized to achieve higher light efficiency, better heat management and more suitable optical characteristics, thereby improving the performance and application effect of the light source module.

[0088] Specifically, the LED mixed spectrum white light source further comprises a second substrate 3, and a wiring socket 32 and a thermistor 31 arranged on the second substrate 3. The second substrate 3 can be a copper substrate, which has excellent heat conduction performance and electrical conductivity. By arranging the first substrate 2 on the second substrate 3, the heat generated during the operation of the light-emitting lamp bead can be transferred to the second substrate 3, so as to achieve better heat management. The second substrate 3 can be electrically connected to the outside through the wiring socket 32, so that the external power supply can supply power to the light source. The thermistor 31 on the second substrate 3 is used for temperature detection and heat management control.

[0089] In some embodiments, in combination with FIG. 5 and FIG. 6, the plurality of light-emitting lamp beads are arranged in a matrix, which is beneficial to saving the occupied space of the light-emitting lamp beads and facilitating the miniaturization design of the white light source.

[0090] In one embodiment, two adjacent rows of light-emitting beads are arranged with two of the red light LED beads 11, green light LED beads 12, blue light LED beads 13 and white light LED beads 14 in one row, and the other two of the red light LED beads 11, green light LED beads 12, blue light LED beads 13 and white light LED beads 14 in the other row. This arrangement ensures that each color of light-emitting beads is not concentrated in a particular area, thereby achieving color uniformity of the entire light-emitting surface 1, providing more consistent and uniform light efficiency, and producing more natural and uniform synthetic white light. Moreover, the light-emitting types in each row are two, which facilitates the use of a single-layer circuit process for the first substrate 2. It will be understood that in other embodiments, each row of light-emitting beads includes four color beads, and the first substrate 2 uses a double-sided double-layer circuit process.

[0091] For example, when arranging the light-emitting beads, a number of red light LED beads 11 and a number of green light LED beads 12 can be arranged in odd-numbered rows such as the first row and the third row, and a number of blue light LED beads 13 and a number of white light LED beads 14 can be arranged in even-numbered rows such as the second row and the fourth row.

[0092] In one embodiment, the light-emitting surface 1 is circular, so that light can be more widely scattered, thereby covering a larger area, which helps to achieve a more extensive light distribution in lighting applications and reduces the spot effect.

[0093] In one embodiment, the plurality of light-emitting beads covers the light-emitting surface 1, reducing the light blind area and making the distribution of light in space more delicate and reducing the spot phenomenon caused by sparse light-emitting beads.

[0094] In one embodiment, the plurality of light-emitting beads arranged along the circumferential direction of the light-emitting surface 1 includes red light LED beads 11, green light LED beads 12, blue light LED beads 13 and white light LED beads 14, so that the edge of the light-emitting surface 1 mixes light to synthesize uniform white light.

[0095] In one embodiment, of the four consecutive light-emitting beads arranged along the circumferential direction, at least three light-emitting beads are different from each other, thereby further improving the uniformity of light efficiency and the uniformity of color, so that the light can mix uniformly.

[0096] On the basis of the structure, when arranging the light-emitting lamp beads, the colors of the first-end light-emitting lamp beads or the tail-end light-emitting lamp beads of two adjacent odd rows or double rows can be set to be different. For example, the first-end light-emitting lamp bead of the first row of light-emitting lamp beads is set to be a red light LED lamp bead 11, and the tail-end light-emitting lamp bead is set to be a green light LED lamp bead 12. Then, the first-end light-emitting lamp bead of the third row of light-emitting lamp beads can be set to be a green light LED lamp bead 12, and the tail-end light-emitting lamp bead is set to be a red light LED lamp bead 11. Alternatively, the color of the first-end light-emitting lamp bead of the second row of light-emitting lamp beads can be the same as or different from the color of the first-end light-emitting lamp bead of the fourth row of light-emitting lamp beads. In this way, among the four light-emitting lamp beads arranged along the circumferential direction, at least three light-emitting lamp beads are different from each other.

[0097] When arranging the light-emitting lamp beads, the two types of light-emitting lamp beads in each row can be alternately arranged in the same number or different numbers. For example, in the odd rows of light-emitting lamp beads, one red light LED lamp bead 11 and two green light LED lamp beads 12 can be alternately arranged. Then, the two sides of the red light LED lamp bead 11 are both green light LED lamp beads 12, and one side of the green light LED lamp bead 12 is a red light LED lamp bead 11. Alternatively, one red light LED lamp bead 11 and one green light LED lamp bead 12 can be alternately arranged. Then, the two sides of the light-emitting lamp bead are both different color lamp beads.

[0098] In this way, it is ensured that the light-emitting lamp beads of different colors can be adjacent to each other, so that the light emitted by the light source can be more uniformly mixed, which is beneficial to produce uniform light color output. In addition, the number distribution and color combination of the light-emitting lamp beads can be adjusted according to specific lighting needs to achieve a specific lighting effect or meet different application needs.

[0099] Further, among the plurality of light-emitting lamp beads of the two adjacent rows, the plurality of light-emitting lamp beads of one row include red light LED lamp beads 11 and green light LED lamp beads 12, and the plurality of light-emitting lamp beads of the other row include blue light LED lamp beads 13 and white light LED lamp beads 14. Among them, the light emitted by the red light LED lamp bead 11 and the green light LED lamp bead 12 mixed to produce yellow light, and the light emitted by the blue light LED lamp bead 13 and the white light LED lamp bead 14 mixed to adjust the color temperature of the whole white light source. Therefore, the red light LED lamp bead 11 and the green light LED lamp bead 12 are arranged in the same row, and the blue light LED lamp bead 13 and the white light LED lamp bead 14 are arranged in another row. The arrangement mode of the light-emitting lamp beads of different colors in adjacent rows can reduce the area dominated by a single color, so that the color distribution of the light source is more uniform. In addition, the red-green combination and the blue-white combination complement each other, which can optimize the color mixing effect. By adjusting the proportion of red-green and blue-white lamp beads, more accurate color control can be achieved.

[0100] Further, the red LED lamp beads 11, the green LED lamp beads 12, the blue LED lamp beads 13 and the white LED lamp beads 14 are uniformly distributed in the light emitting surface 1, and the light emitting lamp beads of any color are symmetrically distributed in the light emitting surface 1.

[0101] Specifically, the light emitting lamp beads of any color are symmetrically distributed about the row direction X passing through the center of the light emitting surface 1, and / or about the column direction Y passing through the center of the light emitting surface 1, and / or about the center of the light emitting surface 1, which can improve the uniformity of mixed light, improve the optical utilization rate, and reduce the cost of later optical processing.

[0102] In some embodiments, in combination with FIG. 7, the LED mixed spectrum white light source includes a control unit 4 and first, second, third and fourth driving circuits 41, 42, 43 and 44 electrically connected with the control unit 4 respectively, the first driving circuit 41 is electrically connected with the red LED lamp beads 11, the second driving circuit 42 is electrically connected with the green LED lamp beads 12, the third driving circuit 43 is electrically connected with the blue LED lamp beads 13, and the fourth driving circuit 44 is electrically connected with the white LED lamp beads 14. In this embodiment, the red LED lamp beads 11, the green LED lamp beads 12, the blue LED lamp beads 13 and the white LED lamp beads 14 are independent of each other, and the control unit 4 adjusts the on-off and power of the red LED lamp beads 11, the green LED lamp beads 12, the blue LED lamp beads 13 and the white LED lamp beads 14 through the first, second, third and fourth driving circuits 41, 42, 43 and 44 respectively, to form white light with adjustable color temperature.

[0103] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A white LED mixed-spectrum light source, wherein: The LED mixed spectrum white light source includes independently controlled red LED beads (11), green LED beads (12), blue LED beads (13) and white LED beads (14). The peak wavelength of the red LED beads (11) is between 635nm and 660nm, the main peak wavelength of the blue LED beads (13) is between 445nm and 465nm, and the peak wavelength of the white LED beads (14) is between 580nm and 620nm. The green LED bead (12) is a green light chip with a peak wavelength between 510nm and 530nm; or, the green LED bead (12) includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, with the peak wavelength of the first phosphor between 500nm and 540nm.

2. The LED mixed-spectrum white light source according to claim 1, wherein: When the green LED bead (12) is the green chip, the peak wavelength of the red LED bead (11) is between 640nm and 660nm; when the green LED bead (12) includes the first light-emitting chip and the first phosphor, the peak wavelength of the red LED bead (11) is between 635nm and 650nm.

3. The LED mixed-spectrum white light source according to claim 2, wherein: When the green LED bead (12) is the green chip, the spectrum of the red LED bead (11) includes a first band with a wavelength less than 630nm and a wavelength greater than 678nm, and the intensity of the first band is less than or equal to 80% of the intensity of the peak wavelength of the red LED bead (11). When the green LED bead (12) includes the first light-emitting chip and the first phosphor, the spectrum of the red LED bead (11) includes a second band with a wavelength less than 621nm and a wavelength greater than 663nm, and the intensity of the second band is less than or equal to 80% of the intensity of the peak wavelength of the red LED bead (11).

4. The LED mixed-spectrum white light source according to claim 1, wherein: The light emitted by the blue LED bead (13) also includes a subpeak wavelength of 400nm to 420nm.

5. The LED mixed-spectrum white light source according to claim 4, wherein: When the green LED bead (12) is the green chip, the intensity of the second peak value of the blue LED bead (13) is less than 65% of the intensity of the peak wavelength of the blue LED bead (13); When the green LED bead (12) includes the first light-emitting chip and the first phosphor, the intensity of the second peak value of the blue LED bead (13) is 90% to 100% of the intensity of the peak wavelength of the blue LED bead (13).

6. The LED mixed-spectrum white light source according to claim 1, wherein: The blue LED lamp bead (13) includes a first lamp bead (131), a second lamp bead (132) and a third lamp bead (133). The peak wavelength of the first lamp bead (131) is 400nm to 410nm, the peak wavelength of the second lamp bead (132) is 445nm to 455nm, and the peak wavelength of the third lamp bead (133) is 455nm to 465nm. The power ratio of the first LED (131), the second LED (132), and the third LED (133) is 4:5:

3.

7. The LED mixed-spectrum white light source according to claim 1, wherein: The intensity of the white LED bead (14) at a wavelength of 550nm to 650nm is greater than or equal to 60% of the intensity of the peak wavelength of the white LED bead (14).

8. The LED mixed-spectrum white light source according to claim 1, wherein: When the green LED bead (12) is the green chip, the spectrum of the green LED bead (12) includes a third band with wavelengths less than 505nm and wavelengths greater than 535nm, and the intensity of the third band is less than or equal to 60% of the intensity of the peak wavelength of the green LED bead (12). Alternatively, when the spectrum of the green LED bead (12) includes the first light-emitting chip and the first phosphor, the green LED bead (12) includes a fourth band with wavelengths less than 492nm and greater than 585nm, and the intensity of the fourth band is less than or equal to 60% of the intensity of the peak wavelength of the green LED bead (12).

9. The LED mixed-spectrum white light source according to claim 1, wherein: When the green LED bead (12) is the green chip, the brightness ratio of the red LED bead (11), the green LED bead (12), the blue LED bead (13), and the white LED bead (14) is 1.8~2.0:5.5~5.6:1:15~16; When the green LED bead (12) includes the first light-emitting chip and the first phosphor, the brightness ratio of the red LED bead (11), the green LED bead (12), the blue LED bead (13) and the white LED bead (14) is 1.8~2.0:12~13:1:14~15.

10. The LED mixed-spectrum white light source according to claim 1, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

11. The LED mixed-spectrum white light source according to claim 2, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

12. The LED mixed-spectrum white light source according to claim 3, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

13. The LED mixed-spectrum white light source according to claim 4, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

14. The LED mixed-spectrum white light source according to claim 5, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

15. The LED mixed-spectrum white light source according to claim 6, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

16. The LED mixed-spectrum white light source according to claim 7, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

17. The LED mixed-spectrum white light source according to claim 8, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

18. The LED mixed-spectrum white light source according to claim 9, wherein: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm; The white LED bead (14) includes a third light-emitting chip and a third phosphor covering the third light-emitting chip. The peak wavelength of the third phosphor is between 580nm and 620nm. The third light-emitting chip is the same as the second light-emitting chip. The third phosphor includes green phosphor, orange phosphor and red phosphor. The white LED bead (14) emits light with a color temperature range of 2850K to 3250K; the white LED bead (14) emits light with a Duv range of +0.005 to +0.015.

Images