Light source module

Abstract

The utility model relates to the technical field of lighting, and provides a light source module which comprises a first substrate and a plurality of light-emitting lamp beads, the first substrate is provided with a light-emitting face, and the light-emitting lamp beads are installed in the light-emitting face and distributed in a determinant mode. The light-emitting lamp beads comprise red light LED lamp beads, green light LED lamp beads, blue light LED lamp beads and white light LED lamp beads which are independently controlled; in every two adjacent rows of light-emitting lamp beads, two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads are arranged in one row, and the other two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads are arranged in the other row. The arrangement mode of the plurality of light-emitting lamp beads ensures that the light-emitting lamp beads of each color cannot be concentrated in a certain specific area, so that the color uniformity of the whole light-emitting surface is realized, more consistent and more uniform lighting effect is provided, and more natural and more uniform synthetic white light is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, and in particular to a light source module. Background Art

[0002] Light source modules are widely used in the fields of home lighting, commercial lighting, stage lighting, film and television shooting, theater studio lighting, museum lighting, medical lighting, and plant growth lighting. The light source module includes a variety of lamp beads of different colors. The white light emitted by the light source module is composed of a combination of light rays of multiple colors, and different lamp bead arrangement combinations result in a huge difference in the final light combination quality.

[0003] With the improvement of users' requirements for lighting quality and effects, some deficiencies of traditional lamp bead arrangement methods have gradually emerged. Specifically, traditional light source modules usually adopt simple matrix arrangement or random arrangement methods, which easily lead to uneven light efficiency. Especially in large-area lighting or display applications, light spots or shadows are likely to appear, thus affecting the overall light efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a light source module, aiming to solve the technical problem of uneven light efficiency existing in the existing light source modules.

[0005] The present application provides a light source module, which includes a first substrate and a plurality of light-emitting lamp beads. The first substrate has a light-emitting surface, and the plurality of light-emitting lamp beads are installed in the light-emitting surface. The plurality of light-emitting lamp beads are arranged in a determinant distribution; the light-emitting lamp beads include red light LED lamp beads, green light LED lamp beads, blue light LED lamp beads, and white light LED lamp beads that are independently controlled; among two adjacent rows of the light-emitting lamp beads, one row arranges two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads, and the white light LED lamp beads, and the other row arranges the other two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads, and the white light LED lamp beads.

[0006] In one embodiment, the light-emitting surface is circular; the plurality of light-emitting lamp beads cover the light-emitting surface; among the plurality of light-emitting lamp beads arranged along the circumferential direction of the light-emitting surface, the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads, and the white light LED lamp beads are included.

[0007] In one embodiment, among four consecutive light-emitting lamp beads arranged along the circumferential direction, the peak wavelengths of at least three of the light-emitting lamp beads are different from each other.

[0008] In one embodiment, at least one of the red LED beads, the green LED beads, the blue LED beads, and the white LED beads is symmetrically distributed in the row direction about the center of the light-emitting surface;

[0009] and / or, at least one of the red LED beads, the green LED beads, the blue LED beads, and the white LED beads is symmetrically distributed in the column direction about the center of the light-emitting surface;

[0010] and / or, at least one of the red LED beads, the green LED beads, the blue LED beads, and the white LED beads is centrosymmetrically distributed about the center of the light-emitting surface.

[0011] In one embodiment, among the multiple light-emitting beads in adjacent rows, among the multiple light-emitting beads in one row, the red LED beads and the green LED beads are included, and among the multiple light-emitting beads in the other row, the blue LED beads and the white LED beads are included.

[0012] In one embodiment, the peak wavelength of the red LED beads is between 635 nm and 660 nm, the peak wavelength of the green LED beads is between 510 nm and 530 nm, the main peak wavelength of the blue LED beads is between 445 nm and 465 nm, and the peak wavelength of the white LED beads is between 580 nm and 620 nm.

[0013] In one embodiment, the blue LED beads include a first bead, a second bead, and a third bead, the peak wavelength of the first bead is 400 nm - 410 nm, the peak wavelength of the second bead is 445 nm - 455 nm, and the peak wavelength of the third bead is 455 nm - 465 nm.

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

[0015] In one embodiment, when the green LED beads are green chips, the ratio of the luminous fluxes of the red LED beads, the green LED beads, the blue LED beads, and the white LED beads is 1.8 - 2.0:5.5 - 5.6:1:15 - 16.

[0016] In one embodiment, when the green LED lamp bead includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous fluxes 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.

[0017] In one embodiment, 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;

[0018] 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; the third phosphor includes a green phosphor, an orange phosphor, and a red phosphor.

[0019] In one embodiment, the light source module includes a control unit and a first driving circuit, a second driving circuit, a third driving circuit, and a fourth driving circuit respectively and electrically connected to the control unit. The first driving circuit is electrically connected to the red LED lamp bead, the second driving circuit is electrically connected to the green LED lamp bead, the third driving circuit is electrically connected to the blue LED lamp bead, and the fourth driving circuit is electrically connected to the white LED lamp bead.

[0020] The beneficial effects of the light source module provided by the present utility model are as follows: The red LED lamp bead, the green LED lamp bead, the blue LED lamp bead, and the white LED lamp bead independently control light emission respectively, and mixed light forms white light with adjustable color temperature, realizing dimming of white light within the color temperature range of 2000K to 20000K; compared with the white light synthesized by three colors, the gamut range of the white light synthesized by four colors is larger on the chromaticity diagram, and its coordinate points are more flexible and precisely adjustable, being basically or completely consistent with natural white light; compared with the white light synthesized by five colors or more than five colors, the types of lamp bead colors are fewer and the number of driving circuits is fewer, which is beneficial to the miniaturization and light weight of the light source module; the arrangement mode of multiple light-emitting lamp beads ensures that the light-emitting lamp beads of each color will not be concentrated in a certain specific area, thereby realizing color uniformity of the entire light-emitting surface, providing a more consistent and uniform light effect, solving the technical problem of uneven light effect existing in the existing light source module, and generating a more natural and uniform synthesized white light. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a light source module provided by an embodiment of the present invention;

[0023] Figure 2 It is another schematic structural diagram of a light source module provided by an embodiment of the present invention;

[0024] Figure 3 It is a spectral combination diagram of the light source module when the green LED lamp bead is a green chip in this embodiment;

[0025] Figure 4 It is a spectral combination diagram of the light source module when the green LED lamp bead includes a first light-emitting chip and a first phosphor in this embodiment;

[0026] Figure 5 It is a light quality parameter diagram of the light source module provided by an embodiment of the present invention;

[0027] Figure 6 It is a light quality parameter diagram in the related art;

[0028] Figure 7 It is a circuit schematic diagram of the light source module provided by an embodiment of the present invention.

[0029] Among them, each reference numeral in the figure:

[0030] 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 drive circuit; 42, second drive circuit; 43, third drive circuit; 44, fourth drive circuit. Detailed Embodiments

[0031] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0032] Reference to "one embodiment" or "an embodiment" throughout the specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Combined Figure 1 , the present application provides a light source module. The light source module includes a first substrate 2 and a plurality of light-emitting lamp beads. The first substrate 2 has a light-emitting surface 1, and the plurality of light-emitting lamp beads are installed in the light-emitting surface 1. The plurality of light-emitting lamp beads are arranged in a row matrix, which is beneficial to saving the occupied space of the light-emitting lamp beads and facilitating the miniaturized design of the light source module.

[0037] The light-emitting lamp beads include a red LED lamp bead 11, a green LED lamp bead 12, a blue LED lamp bead 13, and a white LED lamp bead 14 that are independently controlled. 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 emit light independently, and the mixed light forms white light with adjustable color temperature, realizing dimming of white light within the color temperature range of 2000K to 20000K; compared with the white light synthesized by three colors, the white light synthesized by four colors has a larger color gamut range on the chromaticity diagram, and its coordinate points are more flexible and precisely adjustable, being basically or completely consistent with natural white light; compared with the white light synthesized by five or more than five colors, the lamp bead color types are fewer and the driving channels are fewer, which is beneficial to the miniaturization and light weight of the light source module.

[0038] Among two adjacent rows of light-emitting lamp beads, one row arranges two 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, and the other row arranges the other two 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. In this way, the arrangement of multiple light-emitting lamp beads ensures that the light-emitting lamp beads of each color will not be concentrated in a certain specific area, thereby realizing the color uniformity of the entire light-emitting surface 1, providing a more consistent and uniform light effect, solving the technical problem of uneven light effect existing in the existing light source module, and generating a more natural and uniform synthesized white light.

[0039] Specifically, the first substrate 2 can be selected as a metal substrate or a ceramic substrate.

[0040] In one embodiment, the light-emitting lamp bead can be one or several of a flip chip, a flip CSP, and a vertical chip. For example, the flip chip can provide better thermal management capabilities because the LED chip is directly mounted on the first substrate 2, which can conduct heat more effectively. The flip CSP technology directly encapsulates the LED chip in an extremely small package, greatly reducing the volume and weight of the light source module. Also, for example, the vertical chip makes the light emission direction of the LED chip perpendicular to the first substrate 2, which is beneficial to beam control and reflection management in optical design.

[0041] Therefore, by using a flip chip, a flip CSP, or a vertical chip as the packaging structure of the LED lamp bead, it can be optimized according to the thermal management requirements, size limitations, and optical design requirements of specific applications to achieve higher light efficiency, better thermal management, and more suitable optical characteristics, thereby improving the performance and application effect of the light source module.

[0042] In some embodiments, in combination with Figure 2The light source module also includes 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 thermal conductivity and electrical conductivity. The first substrate 2 is arranged on the second substrate 3, and the heat generated during the operation of the light-emitting lamp beads can be transferred to the second substrate 3 to achieve better thermal management. The second substrate 3 can be electrically connected to the outside through the wiring socket 32 so that an external power supply can supply power to the light source; the thermistor 31 on the second substrate 3 is used to achieve temperature detection and thermal management control.

[0043] In some embodiments, in combination Figure 1 , the light emitting surface 1 is circular, so that the light can be scattered more widely, thereby covering a larger area, which helps to achieve a wider light distribution and reduce the spot effect in lighting applications.

[0044] Specifically, a plurality of light-emitting lamp beads are distributed all over the light-emitting surface 1, which reduces blind areas of illumination, makes the distribution of light in space more delicate, and reduces the light spot phenomenon caused by sparse light-emitting lamp beads.

[0045] Specifically, the plurality of light-emitting lamp beads arranged along the circumferential direction of the light-emitting surface 1 include 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, so that the edge of the light-emitting surface 1 is mixed into uniform white light.

[0046] In one embodiment, in combination Figure 1 Among the four consecutive light-emitting lamp beads arranged along the circumferential direction, the peak wavelengths of at least three light-emitting lamp beads are different from each other, thereby further improving the uniformity of the light effect and the uniformity of the color, so that the light can be mixed evenly.

[0047] On the basis of this 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 or even rows can be set differently. For example, the first end light-emitting lamp beads of the first row of light-emitting lamp beads are set to red light LED lamp beads 11, and the tail end light-emitting lamp beads are set to green light LED lamp beads 12, then the first end light-emitting lamp beads of the third row of light-emitting lamp beads can be set to green light LED lamp beads 12, and the tail end light-emitting lamp beads can be set to red light LED lamp beads 11. Optionally, the color of the first end lamp beads of the second row of lamp beads can be the same as or different from the color of the first end lamp beads of the fourth row of lamp beads.

[0048] When arranging the light-emitting lamp beads, the two types of light-emitting lamp beads in each row can be alternately arranged according to the same quantity or different quantities. For example, among the light-emitting lamp beads in the odd rows, one red LED lamp bead 11 and two green LED lamp beads 12 can be alternately arranged. Then, both sides of the red LED lamp bead 11 are green LED lamp beads 12, and one side of the green LED lamp bead 12 is a red LED lamp bead 11. Or one red LED lamp bead 11 and one green LED lamp bead 12 can be alternately arranged, so that both sides of the light-emitting lamp beads are lamp beads of different colors.

[0049] Thus, it is ensured that the light-emitting lamp beads of different colors can be adjacent to each other, enabling the light emitted by the light source to be more evenly mixed, which is conducive to generating a uniform light color output. In addition, the quantity distribution and color combination of the light-emitting lamp beads can be adjusted according to specific lighting requirements to achieve a specific lighting effect or meet different application needs.

[0050] In some embodiments, in combination with Figure 1 , at least 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 is symmetrically distributed with respect to the row direction passing through the center of the light-emitting surface 1, which can improve the uniformity of light mixing, improve the optical utilization rate, and reduce the cost of subsequent optical processing.

[0051] In some embodiments, in combination with Figure 1 , at least 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 is symmetrically distributed with respect to the column direction passing through the center of the light-emitting surface 1, which can improve the uniformity of light mixing, improve the optical utilization rate, and reduce the cost of subsequent optical processing;

[0052] In some embodiments, in combination with Figure 1 , at least 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 is centrosymmetrically distributed with respect to the center of the light-emitting surface 1, which can improve the uniformity of light mixing, improve the optical utilization rate, and reduce the cost of subsequent optical processing.

[0053] In some embodiments, in combination with Figure 1, among the multiple light-emitting beads in adjacent two rows, among the multiple light-emitting beads in one row, there are a red light LED bead 11 and a green light LED bead 12, and among the multiple light-emitting beads in the other row, there are a blue light LED bead 13 and a white light LED bead 14. Among them, the light emitted by the red light LED bead 11 and the green light LED bead 12 is mixed to produce yellow light, and the light emitted by the blue light LED bead 13 and the white light LED bead 14 can adjust the overall color temperature of the light source. Therefore, the red light LED bead 11 and the green light LED bead 12 are arranged in the same row, and the blue light LED bead 13 and the white light LED bead 14 are arranged in the other row. The arrangement of the light-emitting beads of different colors in adjacent rows can reduce the area dominated by a single color of light, making the color distribution of the light source 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 ratio of the red-green and blue-white beads, more precise color control can be achieved.

[0054] Figure 3 and Figure 4 , the arrow B points to the spectral curve of the blue light LED bead 13, the arrow G points to the spectral curve of the green light LED bead 12, the arrow W points to the spectral curve of the white light LED bead 14, and the arrow R points to the spectral curve of the red light LED bead 11.

[0055] In some embodiments, in combination with Figure 3 and Figure 4 , the peak wavelength of the red light LED bead 11 is between 635 nm and 660 nm, the peak wavelength of the green light LED bead 12 is between 510 nm and 530 nm, the main peak wavelength of the blue light LED bead 13 is between 445 nm and 465 nm, and the peak wavelength of the white light LED bead 14 is between 580 nm and 620 nm. Compared with the white light synthesized by three colors, the gamut range of the white light synthesized by four colors on the chromaticity diagram is larger, and its coordinate points are more flexible and precisely adjustable, which is basically the same as or completely the same as natural white light, ensuring that the Ra of the color rendering index CRI is higher than 96 in the range of 2500K - 10000K (see Figure 5 ). Figure 5 is the light quality parameter diagram of the light source module, including the average quality parameter test results of two cases where the green light LED bead 12 is a green chip and the green light LED bead 12 includes a first light-emitting chip and a first phosphor. Compared with the white light synthesized by five colors or more than five colors, the number of light colors emitted by the LED beads is small and the number of driving circuits is small, which not only reduces the manufacturing cost, but also is more conducive to the miniaturization and light weight of the light source module, improving its mobile portability.

[0056] See Figure 5, the four-color spectrum mixing and superposition provided by this application reduces white light deviation and fluctuation, achieving a TLCI index higher than 93 in the color temperature range of 2500K - 2900K and higher than 95 in the color temperature range of 3000K - 20000K, taking into account the high requirements of the color temperature range, color rendering index, and TLCI index, and meeting the high requirement indicators of the TLCI index in the field of photographic lighting.

[0057] In this application, the spectrum of the white light LED lamp bead 14 includes a part of the wavelength bands of blue light and cyan light, which is beneficial to improving the TLCI index. Among them, 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, and it is difficult to directly deduce that both of these two indicators meet. In related designs, if the white light LED lamp bead 14 of the light source module provided by this application is replaced with a yellow light LED lamp bead, the peak wavelength of the yellow light LED lamp bead is 570nm - 590nm, combined with Figure 6 , the TLCI index is lower than 90 in the color temperature range of 2500K - 2900K and lower than 95 in the color temperature range of 2900K - 20000K, which cannot meet the TLCI requirements of photographic lighting. Similarly, in other solutions, replacing any one of the red light LED lamp bead 11, green light LED lamp bead 12, blue light LED lamp bead 13, and white light LED lamp bead 14, or modifying the peak wavelength of the red light LED lamp bead 11, green light LED lamp bead 12, blue light LED lamp bead 13, and white light LED lamp bead 14, it is difficult to simultaneously meet the high requirements of the color rendering index and the TLCI index.

[0058] In some embodiments, combined with Figure 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.

[0059] Based on this, the blue light LED lamp bead 13 can achieve a wider spectral coverage through the combination of three blue light lamp beads with different peak wavelengths, thereby significantly improving the spectral similarity index (SSI) index. For example, when the target color temperature is 3200K, the SSI reaches above 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 applications such as photographic fill light, making photographic works have more real color restoration and higher detail expressiveness. At the same time, the spectral distribution closer to natural light can reduce eye fatigue and discomfort and improve people's visual comfort.

[0060] In one embodiment, the power ratio of the first LED bead 131, the second LED bead 132, and the third LED bead 133 is 4:5:3. The second LED bead 132 provides blue light closer to pure blue, and its ratio is larger, which is conducive to achieving a larger color temperature value and expanding the color temperature range. This power ratio range is conducive to flexibly adjusting the color temperature, brightness, and spectral distribution of the blue LED bead 13, enabling the spectral coverage of the light source module to be wider, while maintaining spectral characteristics similar to natural light, thereby increasing the spectral similarity index of the light source module, optimizing the color rendering property of the light source, and enhancing visual comfort with natural light.

[0061] In this embodiment, the main peak wavelength of the light emitted by the blue LED bead 13 is between 445 nm and 465 nm. Blue light with a shorter wavelength (close to 445 nm) is suitable for high-brightness and high-contrast application scenarios, while blue light with a longer wavelength (close to 465 nm) is suitable for soft-light application scenarios. For example, when the blue LED bead 13 includes the first LED bead 131, the second LED bead 132, and the third LED bead 133, the first LED bead 131, the second LED bead 132, and the third LED bead 133 are connected in series, and the peak wavelength of the blue LED bead 13 is achieved to be 400 nm to 465 nm.

[0062] In one embodiment, the peak wavelength of the first LED bead 131 is 407 nm, the peak wavelength of the second LED bead 132 is 452 nm, and the peak wavelength of the third LED bead 133 is 460 nm. Since the wavelength 452 nm is closer to the center of pure blue, it is selected as the peak wavelength of the second LED bead 132, and the first LED bead 131 and the third LED bead 133 are respectively selected with shorter wavelength (407 nm) and longer wavelength (460 nm), making the spectral distribution of the entire blue LED bead 13 more extensive and uniform.

[0063] It can be understood that in one embodiment, only one of the first LED bead 131, the second LED bead 132, and the third LED bead 133 is selected for the blue LED bead 13 to reduce the types of blue LED beads, and reduce the number of components and stocking costs of the light source module. In another embodiment, the blue LED bead 13 is two of the first LED bead 131, the second LED bead 132, and the third LED bead 133. Through two different peak wavelength blue lights, the configuration of synthesized white light can be optimized, making the white light closer to natural light, and compared with using three different peak wavelength beads, it is conducive to reducing the types of beads, and reducing the manufacturing cost and control cost.

[0064] In some embodiments, the number of red LED beads 11, green LED beads 12, blue LED beads 13, and white LED beads 14 is multiple. Any one color of LED beads among the multiple red LED beads 11, multiple green LED beads 12, multiple blue LED beads 13, and multiple white LED beads 14 can be selected to be connected in series. The series connection reduces the number of lines and complexity in the circuit, making the wiring more concise and clear, facilitating the reduction of manufacturing difficulty and cost. Moreover, the series current is the same, reducing the abnormality of uneven brightness caused by uneven current distribution in the circuit and simplifying the regulation difficulty. Specifically, multiple red LED beads 11 are connected in series, multiple green LED beads 12 are connected in series, multiple blue LED beads 13 are connected in series, and multiple white LED beads 14 are connected in series.

[0065] In other embodiments, the number of red LED beads 11, green LED beads 12, blue LED beads 13, and white LED beads 14 is multiple. Any one color of LED beads among the multiple red LED beads 11, multiple green LED beads 12, multiple blue LED beads 13, and multiple white LED beads 14 forms at least two branches connected in parallel, which is beneficial to reducing the current in the branch and improving the use safety. For example, multiple red LED beads 11 form four branches, and each branch is composed of six red LED beads 11 connected in series.

[0066] Specifically, if the power of each branch is the same, the current of each branch is the same, achieving consistent light emission brightness of each LED bead. At this time, the types of LED beads on the branch can be the same or different, and the number of LED beads can be the same or different, as long as the power is the same, which is not uniquely limited here.

[0067] In some embodiments, in combination with Figure 7 , multiple blue LED beads 13 form multiple branches, and each branch includes at least one of the first bead 131, the second bead 132, and the third bead 133. The multiple branches are connected in parallel with each other. When the overall power of the blue LED beads 13 is relatively large, the multiple branches are connected in parallel, which is beneficial to the relatively uniform distribution of the total current to each branch, beneficial to reducing the current flowing through each branch, and further reducing the current of the first bead 131, the second bead 132, and the third bead 133 on each branch, improving the use safety.

[0068] In one of the embodiments, a second bead 132 and / or a third bead 133 are connected in series between two first beads 131 on the branch, that is, the two first beads 131 are not adjacent, ensuring the dispersed arrangement of the first beads 131 and making the spectral distribution of the branch more uniform and extensive.

[0069] In one embodiment, a first light-emitting diode (LED) 131 and / or a third LED 133 are connected in series between two second LEDs 132 on a branch, that is, the two second LEDs 132 are not arranged adjacent to each other, ensuring that the second LEDs 132 are arranged dispersedly, making the spectral distribution of the branch more uniform and extensive.

[0070] In one embodiment, a first LED 131 and / or a second LED 132 are connected in series between two third LEDs 133 on a branch, that is, the two third LEDs 133 are not arranged adjacent to each other, ensuring that the third LEDs 133 are arranged dispersedly, making the spectral distribution of the branch more uniform and extensive.

[0071] Specifically, each branch includes a first LED 131, a second LED 132, and a third LED 133 connected in series. In each branch, the quantity ratio of the first LED 131, the second LED 132, and the third LED 133 is 1:1:1. On the one hand, the types and quantities of the LEDs in the branch are the same, making the circuit design simpler and facilitating the reduction of manufacturing costs and regulation costs. On the other hand, it ensures that the power and current of each branch are the same, achieving the same luminous brightness of each LED and a more uniform and extensive spectral distribution.

[0072] In some embodiments, in combination with Figure 1 and Figure 2 , when the green LED 12 is a green chip, the ratio of the luminous fluxes of the red LED 11, the green LED 12, the blue LED 13, and the white LED 14 is 1.8 - 2.0:5.5 - 5.6:1:15 - 16. Based on this, the white LED 14 has the highest brightness, ensuring the brightness of the overall light source and the white light output effect. The green LED 12 has a relatively high brightness, highlighting the green color rendering effect, and the red LED 11 and the blue LED 13 have lower brightness, balancing the overall light efficiency.

[0073] In some embodiments, in combination with Figure 1 and Figure 2, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous fluxes 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 green LED lamp bead 12 that emits light directly from a green chip, the green LED lamp bead 12 in this embodiment emits green light by the first light-emitting chip exciting the first phosphor layer, and the brightness of the green LED lamp bead 12 adopted is relatively high. This is because if the brightness of the first light-emitting chip is insufficient, the amount of light absorbed by the first phosphor will not be enough to generate sufficient re-radiated light. Therefore, in order to ensure that the first phosphor layer can effectively absorb and re-radiate light, the green LED lamp bead 12 needs to adopt a first light-emitting chip with a relatively high luminous flux to provide stable and efficient light output. Thus, such a setting of the luminous flux ratio can improve the overall luminous efficiency of the light source, reduce energy consumption while providing high-quality lighting. The blue LED lamp bead 13 plays a major role in the realization of high color temperatures and a minor role in the realization of other color temperature values. By reducing its brightness ratio and power, on the one hand, it avoids power waste of the blue LED lamp bead 13, and on the other hand, it makes the power of the LED white light source basically consistent at different color temperatures, which is conducive to energy efficiency optimization.

[0074] Through testing, in the above two luminous flux ratios, the power consistency of the light source module is high at different color temperatures, and the luminous efficiency is high, which is conducive to energy efficiency optimization, and can also improve the stability and reliability of the product. Thus, such a setting of the luminous flux ratio can improve the color rendering index CRI of the light source, making the colors of the illuminated objects more real and natural. Especially in a white light environment, different color LED lamp beads work together to produce high-quality white light.

[0075] Among them, the required luminous flux ratio can be achieved by selecting lamp beads with different brightness and power characteristics. Specifically, lamp beads with different light outputs (luminous fluxes) can be selected, and the required luminous flux ratio can be directly achieved through the luminous flux difference of the lamp beads themselves. Or lamp beads with different powers can be selected. Since lamp beads with different powers will produce different brightnesses under the same current, the required luminous flux ratio can be achieved.

[0076] In some embodiments, the first light-emitting chip is a blue chip, and the first phosphor is a green phosphor. The blue chip has a high luminous efficiency. After combining with the green phosphor, it can achieve a high luminous flux output and improve the lighting efficiency.

[0077] Specifically, when the green LED lamp bead 12 is a green light chip, the spectrum of the green LED lamp bead 12 includes a first band with a wavelength less than 505 nm and a wavelength greater than 535 nm, and the light intensity of the first band is less than or equal to 60% of the light intensity at the peak wavelength of the green LED lamp bead 12, so as to rapidly reduce the light intensity of non-peak wavelengths and reduce stray light.

[0078] Specifically, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the spectrum of the green LED lamp bead 12 includes a second band with a wavelength less than 492 nm and a wavelength greater than 585 nm, and the light intensity of the second band is less than or equal to 60% of the light intensity at the peak wavelength of the green LED lamp bead 12, broadening the spectral intensity of the green LED lamp bead 12, so that the green light has a high color rendering index and TLCI index.

[0079] In one embodiment, 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 stabilized within this range, which helps to ensure that the red LED lamp beads 11 under different batches and different production conditions maintain a high degree of color consistency.

[0080] Optionally, the second light-emitting chip is a blue chip, which has a high luminous efficiency, can achieve a high luminous flux output, and improve the lighting efficiency.

[0081] In one embodiment, in combination with Figure 1 、 Figure 3 and Figure 4 , when the green LED lamp bead 12 is a green light chip, the spectral bandwidth of the green LED lamp bead 12 is narrow, and the spectrum of the red LED lamp bead 11 includes a third band with a wavelength less than 630 nm and a wavelength greater than 678 nm. The light intensity of the third band (see the ordinate in Figure 3 ) is less than or equal to 80% of the light intensity at the peak wavelength of the red LED lamp bead 11, restricting the light intensity of the non-peak wavelengths of the red light, optimizing the spectral distribution, reducing stray light, making the light more pure and the color more saturated. On the one hand, it is beneficial to improve the TLCI index, and on the other hand, it is beneficial to concentrate the energy at the peak wavelength and reduce the energy loss.

[0082] In some other embodiments, in combination with Figure 1 、 Figure 3 and Figure 4 , when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the spectral bandwidth of the green LED lamp bead 12 is wide, and the spectrum of the red LED lamp bead 11 includes a fourth band with a wavelength less than 621 nm and a wavelength greater than 663 nm. The light intensity of the fourth band (see Figure 4The light intensity of the light whose wavelength (ordinate) is less than or equal to 80% of the peak wavelength of the red LED chip 11 limits the light intensity of the non-peak wavelength of red light, broadens the red light band, and balances it with the broadband spectrum of green light, making the synthesized white light closer to natural white light.

[0083] In some embodiments, in combination with Figure 1 , Figure 3 and Figure 4 , the white LED chip 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 580 nm and 620 nm. The peak wavelength of the third phosphor being stable within this range helps ensure that the white LED chips 14 under different batches and different production conditions maintain high color consistency and meet the requirements for TLCI in high-end applications.

[0084] Optionally, in combination with Figure 3 and Figure 4 , the light intensity of the white LED chip 14 at a wavelength of 550 nm - 650 nm is greater than or equal to 60% of the light intensity of the peak wavelength of the white LED chip 14, broadening the light intensity of red and cyan light in the white light, which is beneficial to improving the TLCI index of the synthesized white light.

[0085] Optionally, the third light-emitting chip is a blue chip, which has a high luminous efficiency, can achieve a high luminous flux output, and improve the lighting efficiency.

[0086] Optionally, the third light-emitting chip is the same as the second light-emitting chip, reducing the types of materials to be prepared.

[0087] In one embodiment, the third phosphor includes a green phosphor, an orange phosphor, and a red phosphor. Thus, by adjusting the composition and proportion of the third phosphor, the color temperature range of the output light of the white LED chip 14 can be controlled, and a larger Duv range can be achieved, enhancing the color rendering index.

[0088] In some embodiments, the color temperature range of the light emitted by the white LED chip 14 is 2850K - 3250K. This can avoid the problem of low CRI and TLCI indices within the color temperature range of 2850K - 3250K due to the mixing of multiple single-color LED chips.

[0089] In some embodiments, the Duv value represents the color difference between the light source color and the color of blackbody radiation at the same color temperature. The Duv range of the light emitted by the white LED lamp bead 14 is from +0.005 to +0.015, ensuring that the light emitted by the white LED lamp bead 14 has relatively high stability, can reduce the color difference problem caused by color temperature fluctuations, and makes the power 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 2850K - 3250K will be too high; if the Duv is higher than +0.015, the light power at a color temperature above 3250K will be too high.

[0090] In some embodiments, in combination with Figure 1 、 Figure 3 and Figure 4 , the light emitted by the blue LED lamp bead 13 also includes a secondary peak with a wavelength of 400nm - 420nm, achieving a wider spectral coverage, making the mixed white light closer to the spectral characteristics of natural light, so as to improve the color rendering index and the TLCI index.

[0091] In one of the embodiments, when the green LED lamp bead 12 is a green light chip, since the green light energy generated by the green light chip is concentrated and the spectral bandwidth is narrow, it is defined that the light intensity of the secondary peak of the blue LED lamp bead 13 is less than 65% of the light intensity of the peak wavelength emitted by the blue LED lamp bead 13, which can be balanced with the narrow bandwidth spectrum of the green light and maintain the improvement of the color rendering index and color restoration ability of the light source module.

[0092] In another embodiment, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the green light spectrum bandwidth generated by the green LED lamp bead 12 is wide, and the light intensity of the secondary peak of the blue LED lamp bead 13 is 90% - 100% of the light intensity of the peak wavelength emitted by the blue LED lamp bead 13, which can be balanced with the wide bandwidth spectrum of the green light and maintain the improvement of the color rendering index and color restoration ability of the light source module.

[0093] In this embodiment, the blue LED lamp bead 13 can be composed of one or more than one color lamp bead, that is, the blue LED lamp bead 13 can be composed of at least one color lamp bead selected from blue, violet, and ultraviolet lamp beads with different band spectra in proportion. At least one color lamp bead can be connected in series or in parallel and uses the same drive circuit.

[0094] In one embodiment, the light source module includes a control unit 4, and a first driving circuit 41, a second driving circuit 42, a third driving circuit 43, and a fourth driving circuit 44 that are electrically connected to the control unit 4 respectively. The first driving circuit 41 is electrically connected to a red LED lamp bead 11, the second driving circuit 42 is electrically connected to a green LED lamp bead 12, the third driving circuit 43 is electrically connected to a blue LED lamp bead 13, and the fourth driving circuit 44 is electrically connected to a white LED lamp bead 14. In this embodiment, 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 independent of each other. The control unit 4 independently adjusts the on / off and current 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 through the first driving circuit 41, the second driving circuit 42, the third driving circuit 43, and the fourth driving circuit 44 respectively, so as to form white light with adjustable color temperature.

[0095] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light source module, characterized in that: The light source module includes a first substrate (2) and a plurality of light-emitting beads. The first substrate (2) has a light-emitting surface (1), and the plurality of light-emitting beads are installed in the light-emitting surface (1). The plurality of light-emitting beads are arranged in a row matrix; the light-emitting beads include a red light LED bead (11), a green light LED bead (12), a blue light LED bead (13), and a white light LED bead (14) that are independently controlled; among two adjacent rows of the light-emitting beads, one row arranges two of the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14), and the other row arranges the other two of the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14).

2. The light source module according to claim 1, wherein: The light-emitting surface (1) is circular; the plurality of light-emitting beads cover the light-emitting surface (1); among the plurality of light-emitting beads arranged along the circumferential direction of the light-emitting surface (1), there are included the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14).

3. The light source module according to claim 2, wherein: Among four consecutive light-emitting beads arranged along the circumferential direction, the peak wavelengths of at least three of the light-emitting beads are different from each other.

4. The light source module according to claim 2, wherein: At least one of the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14) is symmetrically distributed with respect to the row direction passing through the center of the light-emitting surface (1); and / or, at least one of the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14) is symmetrically distributed with respect to the column direction passing through the center of the light-emitting surface (1); and / or, at least one of the red light LED bead (11), the green light LED bead (12), the blue light LED bead (13), and the white light LED bead (14) is centrally symmetrically distributed with respect to the center of the light-emitting surface (1).

5. The light source module according to claim 1, wherein: Among the plurality of light-emitting beads in two adjacent rows, among the plurality of light-emitting beads in one row, there are included the red light LED bead (11) and the green light LED bead (12), and among the plurality of light-emitting beads in the other row, there are included the blue light LED bead (13) and the white light LED bead (14).

6. The light source module according to claim 1, wherein: The peak wavelength of the red light LED bead (11) is between 635 nm and 660 nm, the peak wavelength of the green light LED bead (12) is between 510 nm and 530 nm, the main peak wavelength of the blue light LED bead (13) is between 445 nm and 465 nm, and the peak wavelength of the white light LED bead (14) is between 580 nm and 620 nm.

7. The light source module according to claim 1, wherein: The blue LED lamp beads (13) include 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 400 nm to 410 nm, the peak wavelength of the second lamp bead (132) is 445 nm to 455 nm, and the peak wavelength of the third lamp bead (133) is 455 nm to 465 nm; The power ratio of the first lamp bead (131), the second lamp bead (132), and the third lamp bead (133) is 4:5:

3.

8. The light source module according to claim 1, wherein: When the green LED lamp bead (12) is a green light chip, the ratio of the luminous fluxes 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; Or, when the green LED lamp bead (12) includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous fluxes 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.

9. The light source module according to claim 1, wherein: 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 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 third phosphor includes a green phosphor, an orange phosphor, and a red phosphor.

10. The light source module according to any one of claims 1 to 9, characterized in that: The light source module includes a control unit (4), and a first driving circuit (41), a second driving circuit (42), a third driving circuit (43), and a fourth driving circuit (44) respectively and electrically connected to the control unit (4). The first driving circuit (41) is electrically connected to the red LED lamp bead (11), the second driving circuit (42) is electrically connected to the green LED lamp bead (12), the third driving circuit (43) is electrically connected to the blue LED lamp bead (13), and the fourth driving circuit (44) is electrically connected to the white LED lamp bead (14).

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