LED mixed spectrum white light source

Abstract

The present invention relates to the field of lighting technology, providing an LED mixed-spectrum white light source comprising independently controlled red, green, blue, and white LED lamp beads. The peak wavelength of the red LED lamp beads is between 635nm and 660nm, the main peak wavelength of the blue LED lamp beads is between 445nm and 465nm, and the peak wavelength of the white LED lamp beads is between 580nm and 620nm. The peak wavelength of the green LED lamp beads is between 510nm and 530nm or between 500nm and 540nm. This achieves white light dimming from 2000K to 20000K, with an Ra greater than 96 in the 2500-10000K color temperature range, a TLCI index greater than 93 in the 2500K-2900K color temperature range, and greater than 95 in the 3000K-20000K color temperature range.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to an LED mixed spectrum white light source. Background Art

[0002] LED light sources are widely used in home lighting, commercial lighting, stage lighting, film and television production, theater studio lighting, museum lighting, medical lighting, and plant growth lighting. With the increasing emphasis on lighting comfort and white light quality, the requirements for the color temperature range, light quality parameters such as CRI (Color Rendering Index), and TLCI (Television Lighting Consistency Index) of LED white light sources are becoming increasingly stringent. The TLCI index, in particular, is typically required to be greater than 90 for film and television fill lighting. The white light emitted by LED light sources with colored lamp beads is a combination of multiple colors. Different color spectrum combinations result in significantly different white light quality. The final parameters of white light generated by existing spectrum combinations cannot meet the growing demand. Summary of the Invention

[0003] The purpose of the present invention is to provide an LED mixed spectrum white light source, aiming to solve the technical problem that the quality of the synthetic white light generated by the existing LED white light source needs to be further improved.

[0004] The present application provides an LED mixed spectrum white light source, which includes independently controlled red LED lamp beads, green LED lamp beads, blue LED lamp beads, and white LED lamp beads. The peak wavelength of the red LED lamp beads is between 635nm and 660nm, the main peak wavelength of the blue LED lamp beads is between 445nm and 465nm, and the peak wavelength of the white LED lamp beads is between 580nm and 620nm.

[0005] The green LED lamp bead is a green light chip, and the peak wavelength of the green light chip is between 510nm and 530nm; or, the green LED lamp bead includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, and the peak wavelength of the first phosphor is between 500nm and 540nm.

[0006] In one embodiment, when the green LED lamp bead is the green light chip, the peak wavelength of the red LED lamp bead is between 640nm and 660nm; when the green LED lamp bead includes the first light-emitting chip and the first phosphor, the peak wavelength of the red LED lamp bead is between 635nm and 650nm.

[0007] In one embodiment, when the green LED lamp bead is the green light chip, the spectrum of the red LED lamp bead 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 lamp bead.

[0008] In one embodiment, when the green LED lamp bead includes the first light-emitting chip and the first phosphor, the spectrum of the red LED lamp bead 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 emitted by the red LED lamp bead.

[0009] In one embodiment, the light emitted by the blue LED lamp beads also includes a secondary peak with a wavelength of 400nm to 420nm.

[0010] In one embodiment, when the green LED lamp bead is the green chip, the sub-peak intensity of the blue LED lamp bead is less than 65% of the intensity of the peak wavelength of the blue LED lamp bead.

[0011] In one embodiment, when the green LED lamp bead includes the first light-emitting chip and the first phosphor, the sub-peak intensity of the blue LED lamp bead is 90% to 100% of the intensity of the peak wavelength of the blue LED lamp bead.

[0012] In one embodiment, the blue light LED lamp beads include a first lamp bead, a second lamp bead and a third lamp bead, the peak wavelength of the first lamp bead is 400nm~410nm, the peak wavelength of the second lamp bead is 445nm~455nm, and the peak wavelength of the third lamp bead is 455nm~465nm.

[0013] In one embodiment, the power ratio of the first lamp bead, the second lamp bead and the third lamp bead is 4:5:3.

[0014] In one embodiment, the intensity of the white light LED lamp bead at a wavelength of 550 nm to 650 nm is greater than or equal to 60% of the intensity of the white light LED lamp bead at a peak wavelength.

[0015] In one embodiment, when the green LED lamp bead is the green chip, the brightness 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.

[0016] In one embodiment, when the green LED lamp bead includes the first light-emitting chip and the first phosphor, the brightness 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.

[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 635nm and 660nm.

[0018] In one embodiment, the white light 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.

[0019] In one embodiment, the third light-emitting chip is the same as the second light-emitting chip.

[0020] In one embodiment, the third phosphor includes green phosphor, orange phosphor and red phosphor.

[0021] In one embodiment, the color temperature range of the light emitted by the white light LED lamp beads is 2850K to 3250K.

[0022] In one embodiment, the Duv range of the light emitted by the white light LED lamp bead is +0.005 to +0.015.

[0023] The beneficial effects of the LED mixed spectrum white light source provided by the present invention are as follows: the red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads are independently controlled to emit light, 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 on the chromaticity diagram, and its coordinate points are more flexible and accurately adjustable, which is basically consistent with or completely consistent with natural white light, ensuring that the color rendering index Ra of CRI is higher than 96 in the range of 2500-10000K; compared with the white light synthesized by five colors or more, the lamp beads have fewer color types and fewer driving paths, which is conducive to miniaturization and lightweighting of the white light source; the red LED lamp beads, blue LED lamp beads and white LED The peak wavelengths of the lamp beads are respectively between 635nm~660nm, 445nm~465nm and 580nm~620nm. The white light provided by the white light LED lamp beads includes part of the blue light and cyan light bands, which is conducive to improving the TLCI index. The peak wavelength of the green light LED lamp beads is between 510nm~530nm or 500nm~540nm. The four-color spectrum mixing design reduces color deviation and fluctuation, and achieves 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. This solves the technical problem that the quality of the synthetic white light generated by the existing LED white light source needs to be further improved, while taking into account the high requirements of color temperature range, color rendering index and TLCI index. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A first spectrum combination diagram of the LED mixed spectrum white light source provided by an embodiment of the present invention;

[0026] Figure 2 A second spectrum combination diagram of the LED mixed spectrum white light source provided by an embodiment of the present invention;

[0027] Figure 3 A diagram showing light quality parameters of an LED mixed spectrum white light source provided by an embodiment of the present invention;

[0028] Figure 4 is a light quality parameter diagram in the related art;

[0029] Figure 5A schematic structural diagram of an LED mixed spectrum white light source provided by an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of another structure of the LED mixed spectrum white light source provided by an embodiment of the present invention;

[0031] Figure 7 This is a circuit diagram of an LED mixed spectrum white light source provided by an embodiment of the present invention.

[0032] Among them, the reference numerals in the figures are:

[0033] 1. Luminous 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 DESCRIPTION

[0034] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0035] Reference throughout this 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 present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] In some lighting fields, such as photography fill lighting, stage lighting, and theater studio lighting, the TLCI index requirements for white light sources are becoming increasingly higher. For film and television fill lighting, a TLCI index greater than 90 or even greater than 95 is usually required. At the same time, in the fields of photography fill lighting and stage lighting, light sources and lamps are mostly rented and need to be frequently transported or moved, which places high demands on the portability of the light sources. Therefore, the smaller the size and weight, the better.

[0040] Combine Figure 1 、 Figure 2 、 Figure 5 and Figure 6 The present application provides an LED mixed-spectrum white light source. 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 light emitted by the red, green, blue, and white LED beads 11, 12, 13, and 14 is mixed to form white light with adjustable color temperature, enabling dimming of the white light within a color temperature range of 2000K to 20000K.

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

[0042] In some embodiments, combined Figure 1 , the green LED lamp bead 12 can be directly a green chip, and the peak wavelength of the green chip is between 510nm and 530nm. In other embodiments, combined with Figure 2 The green LED lamp bead 12 includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, and the peak wavelength of the first phosphor is between 500nm and 540nm.

[0043] Based on this, the peak wavelengths of the red LED lamp bead 11, the blue LED lamp bead 13, and the white LED lamp bead 14 are respectively between 630nm and 660nm, 445nm and 465nm, and 580nm and 620nm, and the peak wavelength of the green LED lamp bead 12 is between 510nm and 530nm or 500nm and 540nm. Compared with the white light synthesized by three colors, the white light synthesized by four colors has a larger color gamut on the chromaticity diagram, and its coordinate points are more flexible and accurately adjustable, which is basically consistent with or completely consistent with natural white light. Figure 3 , ensuring that the color rendering index CRI Ra is higher than 96 in the range of 2500K-10000K. Figure 3 This is a graph of the light quality parameters of a mixed-spectrum LED white light source, including the average quality parameter test results for two scenarios: the green LED lamp bead 12 is a green chip, and the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor. Compared to white light synthesized from five or more colors, the LED lamp bead of this solution emits fewer colors and requires fewer drive paths, which not only reduces manufacturing costs but also facilitates miniaturization and lightweighting of the mixed-spectrum LED white light source, improving its portability. Figure 3 The four-color spectrum mixing and superposition provided in this application reduces the deviation and fluctuation of white light. At the same time, the white light generated by the white light LED lamp bead 14 includes a part of the blue light and cyan light bands, which is conducive to improving the TLCI index. The comprehensive TLCI index is 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 color temperature range, color rendering index and TLCI index, and meeting the high requirements of TLCI index in the field of photographic lighting.

[0044] In this field, the color rendering index CRI Ra 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 of these indicators. In the related design, if the white light LED lamp bead 14 of the LED mixed spectrum white light source 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 4The TLCI index is below 90 in the 2500K-2900K color temperature range and below 95 in the 2900K-20000K color temperature range, failing to meet the TLCI requirements for photographic lighting. Similarly, in other solutions, replacing any of the red, green, blue, and white LEDs 11, 12, 13, and 14, or modifying their peak wavelengths, makes it difficult to achieve both a balanced color rendering index and a balanced 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 luminous efficiency, and when combined with the green light phosphor, it can achieve a higher luminous flux output and improve lighting efficiency.

[0046] In some embodiments, combined Figure 1 and Figure 5 When the green LED lamp bead 12 is a green chip, the peak wavelength of the green LED lamp bead 12 is between 510nm and 530nm, and the peak wavelength of the red LED lamp bead 11 is between 640nm and 660nm. The green LED lamp bead 12 uses a green chip to directly emit green light, which has a narrow wavelength band and is biased to the left. At this time, the peak wavelength of the red LED lamp bead 11 is set between 640nm and 660nm, and the red light band is biased to the right. This ensures that the white light produced by the mixing can more accurately restore the color of the object surface and has a higher color rendering index. This helps to reduce deviation and fluctuation of light during the mixing process, thereby improving the TLCI index.

[0047] In other embodiments, combined Figure 2 and Figure 5 When green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the peak wavelength of green LED lamp bead 12 is between 500nm and 540nm, while the peak wavelength of red LED lamp bead 11 is between 635nm and 650nm. Due to the complex composition of the first phosphor, the wavelength undergoes a Stokes shift, which broadens the spectrum and peak wavelength range of green LED lamp bead 12. The light emitted by red LED lamp bead 11 is slightly shifted toward longer wavelengths in the spectrum, ensuring that the resulting white light has a higher color rendering index and TLCI index.

[0048] In some embodiments, combined Figure 1 and Figure 5 When the green LED lamp bead 12 is a green chip, the spectrum of the red LED lamp bead 11 includes a first band with a wavelength less than 630nm and a wavelength greater than 678nm (see Figure 1The intensity of the first wavelength band is less than or equal to 80% of the intensity of the peak wavelength of the red LED lamp bead 11, which limits the intensity of the non-peak wavelength of the red light, optimizes the spectral distribution, reduces stray light, and makes the light purer 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 energy loss.

[0049] In other embodiments, combined Figure 2 and Figure 5 When the green LED lamp bead 12 includes a first light emitting chip and a first phosphor, the spectrum of the red LED lamp bead 11 includes a second wavelength band less than 621nm and a wavelength greater than 663nm (see Figure 2 The intensity of the second wavelength band is less than or equal to 80% of the intensity of the peak wavelength emitted by the red LED lamp bead 11, which limits the intensity of the non-peak wavelength of the red light, optimizes the spectral distribution, reduces stray light, and makes the light purer 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 energy loss.

[0050] In some embodiments, combined Figure 1 、 Figure 2 and Figure 5 The light emitted by the blue LED lamp bead 13 also includes a sub-peak with a wavelength of 400nm to 420nm, achieving a wider spectrum coverage, making the mixed white light closer to the spectral characteristics of natural light, so as to improve the color rendering index and TLCI index.

[0051] In one embodiment, when the green LED lamp bead 12 is a green light chip, the green light energy generated by the green light chip is concentrated and the spectrum is narrow, which limits the sub-peak intensity of the blue LED lamp bead 13 to less than 65% of the intensity of the peak wavelength emitted by the blue LED lamp bead 13. This can be balanced with the narrow bandwidth spectrum of the green light, maintaining the improved color rendering index and color reproduction ability of the white light source.

[0052] In another embodiment, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the green light spectrum generated by the green LED lamp bead 12 has a wide bandwidth, and the sub-peak intensity of the blue LED lamp bead 13 is 90% to 100% of the 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, maintaining the improved color rendering index and color reproduction ability of the white light source.

[0053] In this embodiment, the blue LED lamp beads 13 can be composed of one or more colored lamp beads. That is, the blue LED lamp beads 13 can be composed of at least one color lamp bead from a variety of different spectrum bands, such as blue, violet, and ultraviolet lamp beads, in a proportional combination. The at least one color lamp bead can be connected in series or in parallel and use the same drive circuit.

[0054] In some embodiments, combined Figure 5 and Figure 7 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~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 beads 13 can be combined to achieve a wider spectrum coverage by using 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 beads 13 closer to natural light, providing a more realistic and natural lighting environment for applications such as photography fill light, so that photographic works have more realistic color reproduction and higher detail expression. At the same time, a spectral distribution closer to natural light can reduce eye fatigue and discomfort, and improve people's visual comfort.

[0056] In one embodiment, the spectral shape and intensity distribution of the blue LED lamp bead 13 can be adjusted by adjusting the power ratio of lamp beads of different wavelengths. 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 that is closer to pure blue, and its ratio is larger, which is conducive to achieving a larger color temperature and expanding the color temperature range. This power ratio range is conducive to flexible adjustment of the color temperature, brightness, and spectral distribution of the blue LED lamp bead 13, which is conducive to a wider spectral coverage of the white light source while maintaining spectral characteristics similar to natural light, thereby improving the spectral similarity index of the white light source, optimizing the color rendering of the light source, and natural light can enhance visual comfort.

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

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

[0059] It is 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, thereby reducing the number of blue LED lamp bead 13 lamp beads, reducing the number of components and inventory costs of the 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. By using two blue lights with different peak wavelengths, the configuration of the synthesized white light can be optimized, making the white light closer to natural light. Compared with using lamp beads with three different peak wavelengths, this helps reduce the number of lamp beads and reduces manufacturing and control costs.

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

[0061] Specifically, a plurality of red LED lamp beads 11 are arranged in series, a plurality of green LED lamp beads 12 are arranged in series, a plurality of blue LED lamp beads 13 are arranged in series, and a plurality of white LED lamp beads 14 are arranged in series.

[0062] In other embodiments, the number of red LED lamp beads 11, green LED lamp beads 12, blue LED lamp beads 13, and white LED lamp beads 14 is multiple, and any color LED lamp beads from the multiple red LED lamp beads 11, multiple green LED lamp beads 12, multiple blue LED lamp beads 13, and multiple white LED lamp beads 14 form at least two branches arranged in parallel, which helps reduce the current in each branch and improves safety. For example, the multiple red LED lamp beads 11 form four branches, each branch consisting of six red LED lamp beads 11 connected in series.

[0063] Specifically, if the power of each branch is the same, the current of each branch is the same, so that the brightness of each lamp bead is consistent. In this case, the types of lamp beads on the branches can be the same or different, and the number of lamp beads can be the same or different. They only need to have the same power, and this is not a strict limitation.

[0064] In some embodiments, combined Figure 7 Multiple blue LED lamp beads 13 form multiple branches, each of which includes at least one of the first lamp bead 131, the second lamp bead 132, and the third lamp bead 133. The multiple branches are connected in parallel. When the overall power of the blue LED lamp beads 13 is high, the multiple branches are connected in parallel to help distribute the total current relatively evenly to each branch, thereby reducing the current flowing through each branch. This, in turn, reduces the current flowing through the first lamp bead 131, the second lamp bead 132, and the third lamp bead 133 in each branch, thereby improving safety.

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

[0066] In one embodiment, the first lamp bead 131 and / or the third lamp bead 133 are connected in series between the two second lamp beads 132 on the branch, that is, the two second lamp beads 132 are not arranged adjacent to each other, ensuring that the second lamp beads 132 are dispersed, making the spectral distribution of the branch more uniform and extensive.

[0067] In one embodiment, the first lamp bead 131 and / or the second lamp bead 132 are connected in series between the two third lamp beads 133 on the branch, that is, the two third lamp beads 133 are not arranged adjacent to each other, ensuring that the third lamp beads 133 are dispersedly arranged, making the spectral distribution of the branch more uniform and extensive.

[0068] Specifically, each branch circuit includes a first lamp bead 131, a second lamp bead 132, and a third lamp bead 133 arranged in series. In each branch circuit, the ratio of the first lamp bead 131, the second lamp bead 132, and the third lamp bead 133 is 1:1:1. On the one hand, the same type and number of lamps in each branch circuit simplify the circuit design, helping to reduce manufacturing and control costs. On the other hand, the same power and current are ensured in each branch circuit, achieving consistent brightness from each lamp bead and a more uniform and wide spectral distribution.

[0069] In some embodiments, combined Figure 1 and Figure 2The intensity of the wavelength of 550nm to 650nm of the white light LED lamp bead 14 is greater than or equal to 60% of the intensity of the peak wavelength of the white light LED lamp bead 14, which broadens 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 embodiment, when the green LED lamp bead 12 is a green light chip, the spectrum of the green LED lamp bead 12 includes a third band with a wavelength less than 505nm and a wavelength greater than 535nm. The intensity of the third band is less than or equal to 60% of the intensity of the peak wavelength of the green LED lamp bead 12, so as to quickly reduce the intensity of non-peak wavelengths and reduce stray light.

[0071] 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 fourth band with a wavelength less than 492nm and a wavelength 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 lamp bead 12, broadening the spectral intensity of the green LED lamp bead 12, so that the green light has a higher color rendering index and TLCI index.

[0072] In some embodiments, when the green LED lamp bead 12 is a green light chip, the brightness 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 brightness of the white LED lamp bead 14 is the highest, ensuring the brightness of the overall light source and the white light output effect; the brightness of the green LED lamp bead 12 is relatively high, highlighting the green color rendering effect, and the brightness of the red LED lamp bead 11 and the blue LED lamp bead 13 is lower, balancing the overall light effect. According to tests, the white light source has high power consistency at different color temperatures, which is conducive to energy efficiency optimization and can also improve the stability and reliability of the product. Therefore, such a brightness ratio setting can improve the color rendering index (CRI) of the light source, making the color of the illuminated object more real and natural. Especially in a white light environment, LED lamp beads of different colors work together to produce high-quality white light.

[0073] The desired brightness ratio can be achieved by selecting lamps with different brightness and power characteristics. Specifically, lamps with different light outputs (luminous flux) can be selected to achieve the desired brightness ratio directly through the differences in the lamps' own luminous flux. Alternatively, lamps with different powers can achieve the desired brightness ratio because they produce different brightness levels at the same current.

[0074] In some embodiments, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the brightness 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 to the green LED lamp bead 12, which directly emits light from the green chip, the green LED lamp bead 12 in this embodiment emits green light by stimulating the first phosphor layer with the first light-emitting chip. The brightness of the green LED lamp bead 12 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 produce 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 use a first light-emitting chip with relatively high brightness to provide stable and efficient light output. Therefore, such a brightness ratio setting can improve the overall luminous efficiency of the light source, while providing high-quality lighting and reducing energy consumption.

[0075] In the above two groups of brightness ratios, the blue LED lamp bead 13 plays a greater role in achieving high color temperature, but has a smaller role in achieving other color temperature values. By reducing its brightness proportion and reducing its 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 conducive 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. The second phosphor has a peak wavelength between 635 nm and 660 nm. The second phosphor's peak wavelength is stable within this range, helping to ensure high color consistency across different batches and under different production conditions for the red LED lamp bead 11, meeting the TLCI requirements for high-end applications.

[0077] Optionally, the second light-emitting chip is a blue light chip, which has higher luminous efficiency, can achieve higher luminous flux output, and improve 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 580nm and 620nm. The peak wavelength of the third phosphor is stable within this range, which helps to ensure that the white LED lamp bead 14 from different batches and under different production conditions maintains a high degree of color consistency, meeting the TLCI requirements of high-end applications.

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

[0080] Optionally, the third light-emitting chip is the same as the second light-emitting chip, thereby reducing the types of materials to be prepared.

[0081] Optionally, the third phosphor includes green phosphor, orange phosphor and red phosphor. Thus, by adjusting the composition and ratio of the third phosphor, the color temperature range of the output light of the white light 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 light LED lamp bead 14 is 2850K to 3250K, which can avoid the problem of low CRI and TLCI index in the color temperature range of 2850K to 3250K caused by mixed light of multiple single-light LED lamp beads.

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

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

[0085] In some embodiments, the LED mixed spectrum white light source further includes a first substrate 2 having a light emitting surface 1, and a plurality of light emitting lamp beads are installed 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 diodes can be one or more of a flip-chip, flip-chip CSP, or vertical chip. For example, flip-chips offer improved thermal management because the LED chip is mounted directly on the first substrate 2, enabling more efficient heat conduction. Flip-chip CSP technology directly encapsulates the LED chip in a very small package, significantly reducing the size and weight of the white light source. For another example, vertical chips enable the LED chip's light emission direction to be perpendicular to the first substrate 2, facilitating beam control and reflection management in optical design.

[0087] Therefore, the use of flip chip, flip CSP or vertical chip as the packaging structure of LED lamp beads can be optimized according to the thermal management needs, size restrictions and optical design requirements of specific applications to achieve higher luminous efficiency, better thermal management and more suitable optical properties, thereby improving the performance and application effect of the light source module.

[0088] Specifically, the LED mixed spectrum white light source also includes a second substrate 3, as well as a wiring socket 32 ​​and a thermistor 31 disposed on the second substrate 3. The second substrate 3 can be a copper substrate, which has excellent thermal and electrical conductivity. Placing the first substrate 2 on the second substrate 3 allows heat generated during operation of the light-emitting lamp beads to be transferred to the second substrate 3, thereby achieving better thermal management. The second substrate 3 can be electrically connected to the outside via the wiring socket 32, allowing an external power source to supply power to the light source. The thermistor 31 on the second substrate 3 is used for temperature detection and thermal management control.

[0089] In some embodiments, combined Figure 5 and Figure 6 , multiple light-emitting lamp beads are distributed in a matrix, which is beneficial to saving the space occupied by the light-emitting lamp beads and is conducive to the miniaturized design of the white light source.

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

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

[0092] In one embodiment, 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 in lighting applications and reduce the spot effect.

[0093] In one embodiment, a plurality of light-emitting lamp beads are distributed 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.

[0094] In one embodiment, the multiple 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 edges of the light-emitting surface 1 are mixed to synthesize uniform white light.

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

[0096] Based on 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 to different colors. For example, the first end light-emitting lamp beads of the first row of light-emitting lamp beads are set to red LED lamp beads 11, and the tail end light-emitting lamp beads are set to green 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 LED lamp beads 12, and the tail end light-emitting lamp beads can be set to red LED lamp beads 11. Optionally, the color of the first end light-emitting lamp beads of the second row can be the same as or different from the color of the first end light-emitting lamp beads of the fourth row. In this way, among the four consecutive 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 arranged alternately in the same number or different numbers. For example, in the light-emitting lamp beads in an odd row, one red LED lamp bead 11 and two green LED lamp beads 12 can be arranged alternately, so that 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 arranged alternately, so that both sides of the light-emitting lamp bead are lamp beads of different colors.

[0098] This ensures that different colored light beads can be placed adjacent to each other, allowing the light emitted by the light source to be mixed more evenly, which is conducive to producing a uniform light color output. In addition, the number and color combination of the light beads can be adjusted according to specific lighting needs to achieve a specific lighting effect or meet different application requirements.

[0099] Furthermore, among the multiple light-emitting lamp beads in two adjacent rows, the multiple light-emitting lamp beads in one row include red LED lamp beads 11 and green LED lamp beads 12, and the multiple light-emitting lamp beads in the other row include blue LED lamp beads 13 and white LED lamp beads 14. The light emitted by the red LED lamp beads 11 and green LED lamp beads 12 mix to produce yellow light, while the light emitted by the blue LED lamp beads 13 and white LED lamp beads 14 mix to adjust the overall color temperature of the white light source. Therefore, by placing the red LED lamp beads 11 and green LED lamp beads 12 in the same row and the blue LED lamp beads 13 and white LED lamp beads 14 in another row, the arrangement of the light-emitting lamp beads of different colors in adjacent rows can reduce the area where a single color dominates the 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 to optimize the color mixing effect. By adjusting the ratio of the red-green and blue-white lamp beads, more precise color control can be achieved.

[0100] Furthermore, 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 evenly 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 circle of the light-emitting surface 1, and / or about the column direction Y passing through the center of the circle of the light-emitting surface 1, and / or about the center of the circle of the light-emitting surface 1, which can improve the uniformity of mixed light, improve optical utilization, and reduce the cost of subsequent optical processing.

[0102] In some embodiments, combined Figure 7 The LED mixed spectrum white light source includes a control unit 4 and a first drive circuit 41, a second drive circuit 42, a third drive circuit 43, and a fourth drive circuit 44, which are electrically connected to the control unit 4, respectively. The first drive circuit 41 is electrically connected to the red LED lamp bead 11, the second drive circuit 42 is electrically connected to the green LED lamp bead 12, the third drive circuit 43 is electrically connected to the blue LED lamp bead 13, and the fourth drive circuit 44 is electrically connected to the 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 power 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 drive circuit 41, the second drive circuit 42, the third drive circuit 43, and the fourth drive circuit 44, respectively, to produce white light with adjustable color temperature.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An LED mixed spectrum white light source, characterized by: The LED mixed spectrum white light source comprises a red light LED lamp bead (11), a green light LED lamp bead (12), a blue light LED lamp bead (13) and a white light LED lamp bead (14) which are independently controlled. The peak wavelength of the red light LED lamp bead (11) is between 635nm and 660nm, the main peak wavelength of the blue light LED lamp bead (13) is between 445nm and 465nm, and the peak wavelength of the white light LED lamp bead (14) is between 580nm and 620nm. The green LED lamp bead (12) is a green light chip, and the peak wavelength of the green light chip is between 510nm and 530nm; or the green LED lamp bead (12) includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, and the peak wavelength of the first phosphor is between 500nm and 540nm; The red LED lamp bead (11) comprises 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 635 nm and 660 nm; The white light LED lamp bead (14) comprises a third light-emitting chip and a third phosphor covering the third light-emitting chip, wherein the peak wavelength of the third phosphor is between 580 nm and 620 nm; the third light-emitting chip is the same as the second light-emitting chip; and the third phosphor comprises green phosphor, orange phosphor and red phosphor; The color temperature range of the light emitted by the white light LED lamp bead (14) is 2850K to 3250K; the Duv range of the light emitted by the white light LED lamp bead (14) is +0.005 to +0.

015.

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

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

4. The LED mixed spectrum white light source according to claim 1, characterized in that: The light emitted by the blue LED lamp bead (13) also includes a secondary peak with a wavelength of 400nm to 420nm.

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

6. The LED mixed spectrum white light source according to claim 1, characterized in that: The blue light LED lamp bead (13) comprises a first lamp bead (131), a second lamp bead (132) and a third lamp bead (133), wherein 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 lamp bead (131), the second lamp bead (132) and the third lamp bead (133) is 4:5:

3.

7. The LED mixed spectrum white light source according to claim 1, characterized in that: The intensity of the white light LED lamp 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 light LED lamp bead (14).

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

9. The LED mixed spectrum white light source according to claim 1, characterized in that: When the green LED lamp bead (12) is the green chip, the brightness 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; When the green LED lamp bead (12) includes the first light-emitting chip and the first phosphor, the brightness 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.

10. The LED mixed spectrum white light source according to any one of claims 1 to 9, characterized in that: The 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) are distributed in a determinant manner, and the light-emitting surface (1) of the LED mixed spectrum white light source is circular.

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