LED white light source

Abstract

The application relates to the lighting technical field and provides an LED white light source which comprises independently controlled red light LED lamp beads, green light LED lamp beads, blue light LED lamp beads and white light LED lamp beads; wherein when the green light LED lamp beads are green light chips, the ratio of the luminous fluxes 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 is 1.8-2.0:5.5-5.6:1:15-16; or when the green light LED lamp beads comprise first light emitting chips and first fluorescent powder covering the first light emitting chips, the ratio of the luminous fluxes 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 is 1.8-2.0:12-13:1:14-15. Through testing, the white light source has high power consistency at different color temperatures, solves the technical problem that the existing LED white light source has to be improved in light emitting efficiency, and is thus beneficial to energy efficiency optimization.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, and in particular to an LED white light source. Background Technology

[0002] LED white light sources are widely used in home lighting, commercial lighting, stage lighting, film and television shooting, theater and studio lighting, museum lighting, medical lighting, and plant growth lighting. As people pay more attention to the comfort of the lighting environment and the display effect of white light, the requirements for the color temperature range and power stability of LED white light sources are becoming increasingly stringent.

[0003] LED white light sources consist of multiple colored LED chips, each emitting a different color of light. The white light emitted by an LED white light source is composed of a combination of multiple colors of light. However, the different combinations of luminous flux from these colored LED chips result in vastly different luminous efficiencies in order to meet the color temperature range of the white light. The existing combinations of luminous flux for white light present technical challenges that require improvement in luminous efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an LED white light source that addresses the technical problem that the luminous efficiency of existing LED white light sources needs to be improved.

[0005] This application provides an LED white light source, which includes red LED beads, green LED beads, blue LED beads and white LED beads that are controlled independently. Wherein, when the green LED bead is a green chip, the ratio of the luminous flux of the red LED bead, the green LED bead, the blue LED bead, and the white LED bead is 1.8~2.0:5.5~5.6:1:15~16; Alternatively, when the green LED bead includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous flux of the red LED bead, the green LED bead, the blue LED bead, and the white LED bead is 1.8~2.0:12~13:1:14~15.

[0006] In one embodiment, the red LED bead includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm.

[0007] In one embodiment, the white LED lamp bead includes 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 580nm and 620nm.

[0008] In one embodiment, the third light-emitting chip is the same as the second light-emitting chip; and / or, the third phosphor includes at least one of green phosphor, orange phosphor, and red phosphor.

[0009] In one embodiment, the white LED emits light with a color temperature range of 2850K to 3250K; and / or, the white LED emits light with a Duv range of +0.005 to +0.015.

[0010] In one embodiment, the blue LED lamp bead includes a first lamp bead, a second lamp bead, and a third lamp bead, wherein 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.

[0011] In one embodiment, the power ratio of the first LED, the second LED, and the third LED is 4:5:3; and / or, the peak wavelength of the first LED is 407nm, the peak wavelength of the second LED is 452nm, and the peak wavelength of the third LED is 460nm.

[0012] In one embodiment, the main peak wavelength of the light emitted by the blue LED lamp bead is between 445nm and 465nm.

[0013] In one embodiment, the spectrum of the blue LED lamp bead also includes a subpeak with a wavelength of 400nm to 420nm.

[0014] In one embodiment, when the green LED bead is the green chip, the light intensity of the second peak value of the blue LED bead is less than 65% of the light intensity of the peak wavelength of the blue LED bead.

[0015] In one embodiment, when the green LED bead includes the first light-emitting chip and the first phosphor, the light intensity of the second peak wavelength of the blue LED bead is 90% to 100% of the light intensity of the main peak wavelength of the blue LED bead.

[0016] In one embodiment, the peak wavelength of the green LED bead is between 510nm and 530nm.

[0017] In one embodiment, the white LED light source further includes a first substrate having a light-emitting surface, wherein the red LED, green LED, blue LED and white LED are all light-emitting beads, and a plurality of the light-emitting beads are mounted in the light-emitting surface.

[0018] In one embodiment, a plurality of the light-emitting LED beads are arranged in a row and column arrangement; in two adjacent rows of light-emitting LED beads, one row is arranged with two of the following: red LED beads, green LED beads, blue LED beads, and white LED beads, and the other row is arranged with the following: red LED beads, green LED beads, blue LED beads, and white LED beads.

[0019] In one embodiment, the light-emitting surface is circular; a plurality of light-emitting LED beads cover the light-emitting surface; the plurality of light-emitting LED beads arranged along the circumference of the light-emitting surface include red LED beads, green LED beads, blue LED beads, and white LED beads. In a series of four consecutive light-emitting LED beads arranged along the circumference, at least three of the light-emitting LED beads are different from each other.

[0020] The beneficial effects of the LED white light source provided by this invention are as follows: Red, green, blue, and white LEDs are independently controlled to emit light, and the mixed light forms a white light with adjustable color temperature, achieving dimming within a color temperature range of 2000K to 20000K; compared to three-color synthesized white light, four-color synthesized white light has a larger color gamut on the chromaticity diagram, and its coordinate points are more flexible, precise, and adjustable, essentially identical or completely identical to natural white light; compared to five-color or more-than-five-color synthesized white light, there are fewer LED color types and fewer driving paths, which is beneficial for the miniaturization and weight reduction of the white light source; when the green LED is a green chip... The luminous flux ratio of red, green, blue, and white LEDs is 1.8~2.0:5.5~5.6:1:15~16. When the green LED includes a first light-emitting chip and a first phosphor, the luminous flux ratio of red, green, blue, and white LEDs is 1.8~2.0:12~13:1:14~15. Tests show that the white light source has high power consistency and high luminous efficiency at different color temperatures, solving the technical problem of insufficient luminous efficiency in existing LED white light sources, thus contributing to energy efficiency optimization. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of an LED white light source provided in an embodiment of the present invention; Figure 2 This is another structural schematic diagram of an LED white light source provided in an embodiment of the present invention; Figure 3 This is a first spectral combination diagram of an LED white light source provided in an embodiment of the present invention; Figure 4 This is a second spectral combination diagram of an LED white light source provided in an embodiment of the present invention; Figure 5 A diagram showing the light quality parameters of an LED white light source provided in an embodiment of the present invention; Figure 6 This is a diagram of optical quality parameters in related technologies; Figure 7 A circuit diagram of an LED white light source provided in an embodiment of the present invention.

[0023] The following are the labeling elements in the figure: 1. Light-emitting surface; 11. Red LED bead; 12. Green LED bead; 13. Blue LED bead; 131. First LED bead; 132. Second LED bead; 133. Third LED bead; 14. White LED bead; 2. First substrate; 3. Second substrate; 31. Thermistor; 32. Wiring socket; 4. Control unit; 41. First driving circuit; 42. Second driving circuit; 43. Third driving circuit; 44. Fourth driving circuit. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0026] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Combination Figure 1 and Figure 2 This application provides an LED white light source. The LED white light source includes independently controlled red LED beads 11, green LED beads 12, blue LED beads 13, and white LED beads 14. The red LED beads 11, green LED beads 12, blue LED beads 13, and white LED beads 14 are each independently controlled to emit light, and the light is mixed to form white light with adjustable color temperature, achieving dimming of the white light within the color temperature range of 2000K~20000K. Compared with white light synthesized from three colors, white light synthesized from four colors has a larger color gamut on the chromaticity diagram, and its coordinate points are more flexible and precisely adjustable, basically consistent with or completely consistent with natural white light; compared with white light synthesized from five or more colors, there are fewer types of LED colors and fewer driving paths, which is conducive to the miniaturization and weight reduction of the white light source.

[0030] In some embodiments, when the green LED chip 12 is a green LED, the ratio of luminous flux of the red LED chip 11, green LED chip 12, blue LED chip 13, and white LED chip 14 is 1.8~2.0:5.5~5.6:1:15~16. Based on this, the white LED chip 14 has the highest brightness, ensuring the overall brightness and white light output effect of the light source. The green LED chip 12 has relatively high brightness, highlighting the green color rendering effect, while the red LED chip 11 and blue LED chip 13 have lower brightness, balancing the overall luminous efficiency.

[0031] In some embodiments, when the green LED bead 12 includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the luminous flux ratio of the red LED bead 11, green LED bead 12, blue LED bead 13, and white LED bead 14 is 1.8~2.0:12~13:1:14~15. Compared to the green LED bead 12, which emits light directly from the green chip, in this embodiment, the green LED bead 12 emits green light by exciting the first phosphor layer with the first light-emitting chip. The brightness of the green LED bead 12 used is relatively high 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 bead 12 needs to use a first light-emitting chip with a relatively high luminous flux to provide stable and efficient light output. Thus, such a luminous flux ratio setting can improve the overall luminous efficiency of the light source, reducing energy consumption while providing high-quality lighting. Blue LED beads 13 play a significant role in achieving high color temperatures, but have a smaller impact on achieving other color temperature values. By reducing their brightness proportion and power, we can avoid wasting the power of blue LED beads 13 and ensure that the power of the LED white light source remains basically consistent at different color temperatures, which is beneficial for energy efficiency optimization.

[0032] Testing revealed that, among the two luminous flux ratios mentioned above, the LED white light source exhibits high power consistency and luminous efficiency across different color temperatures, which is beneficial for energy efficiency optimization and can also improve product stability and reliability. Therefore, this luminous flux ratio setting can enhance the color rendering index (CRI) of the light source, resulting in more realistic and natural colors for illuminated objects. Especially in white light environments, the combined effect of different colored LEDs can produce high-quality white light.

[0033] The desired luminous flux ratio can be achieved by selecting LEDs with different brightness and power characteristics. Specifically, LEDs with different light outputs (luminous flux) can be selected, directly achieving the desired luminous flux ratio through the difference in luminous flux of the LEDs themselves. Alternatively, LEDs with different power can be selected; since LEDs with different power will produce different brightness under the same current, the desired luminous flux ratio can be achieved.

[0034] In some embodiments, the first light-emitting chip is a blue light-emitting chip, and the first phosphor is a green phosphor. The blue light-emitting chip has high luminous efficiency, and when combined with the green phosphor, it can achieve high luminous flux output and improve lighting efficiency.

[0035] Figure 3 and Figure 4 In the diagram, arrow B points to the spectral curve of blue LED bead 13, arrow G points to the spectral curve of green LED bead 12, arrow W points to the spectral curve of white LED bead 14, and arrow R points to the spectral curve of red LED bead 11.

[0036] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4 ,Although Figure 3 and Figure 4 The green LED beads 12 in the process have different spectral shapes, but their peak wavelengths are all between 510nm and 530nm, resulting in purer and more saturated green light. The stable peak wavelength of the green LED beads 12 within this range helps ensure high color consistency across different batches and production conditions.

[0037] Specifically, when the green LED bead 12 is a green chip, the spectrum of the green LED bead 12 includes a first band with wavelengths less than 505nm and wavelengths greater than 535nm. The light intensity of the first band is less than or equal to 60% of the light intensity of the peak wavelength of the green LED bead 12, so as to quickly reduce the light intensity of non-peak wavelengths and reduce stray light.

[0038] Specifically, when the green LED bead 12 includes a first light-emitting chip and a first phosphor, the spectrum of the green LED bead 12 includes a second band with wavelengths less than 492nm and wavelengths greater than 585nm. The light intensity of the second band is less than or equal to 60% of the light intensity of the peak wavelength of the green LED bead 12, thus broadening the spectral intensity of the green LED bead 12 and giving the green light a higher color rendering index and TLCI index.

[0039] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4 The red LED bead 11 includes a second light-emitting chip and a second phosphor covering the second light-emitting chip. The peak wavelength of the second phosphor is between 635nm and 660nm. The stable peak wavelength of the second phosphor within this range helps to ensure that the red LED bead 11 produced in different batches and under different production conditions maintains a high degree of color consistency.

[0040] Optionally, the second light-emitting chip is a blue light-emitting chip, which has high luminous efficiency and can achieve high luminous flux output, thereby improving lighting efficiency.

[0041] In one embodiment, combined Figure 1 , Figure 3 and Figure 4 When the green LED chip 12 is a green LED, its spectral bandwidth is relatively narrow. The spectrum of the red LED chip 11 includes a third band with wavelengths less than 630nm and wavelengths greater than 678nm. The light intensity of the third band (see...) Figure 3 The vertical axis of the red LED lamp bead 11 is less than or equal to 80% of the light intensity of the peak wavelength. This limits the light 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 helps to improve the TLCI index, and on the other hand, it helps to concentrate energy at the peak wavelength and reduce energy loss.

[0042] In other embodiments, combined with Figure 1 , Figure 3 and Figure 4 When the green LED bead 12 includes a first light-emitting chip and a first phosphor, the green LED bead 12 has a wider spectral bandwidth. The spectrum of the red LED bead 11 includes a fourth band with wavelengths less than 621nm and wavelengths greater than 663nm. The light intensity of the fourth band (see...) Figure 4 The vertical axis is less than or equal to 80% of the light intensity of the peak wavelength of the red LED bead 11, which limits the light intensity of the non-peak wavelength of the red light, broadens the red light band, and balances it with the wide bandwidth spectrum of the green light, so that the synthesized white light is closer to natural white light.

[0043] In some embodiments, combined 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 580nm and 620nm. The stable peak wavelength of the third phosphor within this range helps to ensure that the white LED chips 14 of different batches and under different production conditions maintain a high degree of color consistency, meeting the requirements of high-end applications for TLCI.

[0044] Optionally, combined Figure 3 and Figure 4 The light intensity of the white LED lamp bead 14 at a wavelength of 550nm~650nm is greater than or equal to 60% of the light intensity of the peak wavelength of the white LED lamp bead 14, which broadens the light intensity of red and cyan light in white light and helps to improve the TLCI index of synthesized white light.

[0045] Optionally, the third light-emitting chip is a blue light chip, which has high luminous efficiency and can achieve high luminous flux output, thereby improving lighting efficiency.

[0046] Optionally, the third light-emitting chip is the same as the second light-emitting chip, reducing the types of materials required.

[0047] Optionally, the third phosphor includes green phosphor, orange phosphor, and 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 bead 14 can be controlled, achieving a wider Duv range and enhancing the color rendering index.

[0048] In some embodiments, the white LED chip 14 emits light with a color temperature range of 2850K to 3250K. This avoids the problem of low CRI and TLCI indices within the 2850K to 3250K color temperature range caused by mixing multiple single-beam LED chips.

[0049] 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 LED chip 14 is +0.005 to +0.015, ensuring high light stability and reducing color difference problems caused by color temperature fluctuations, resulting in essentially consistent power within the color temperature range. If the Duv is below +0.005, the light power will be too high in the color temperature range of 2850K to 3250K; if the Duv is above +0.015, the light power will be too high in color temperatures above 3250K.

[0050] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4 The light emitted by the blue LED beads 13 also includes a sub-peak wavelength of 400nm~420nm, achieving a wider spectral coverage, making the white light generated by the mixture closer to the spectral characteristics of natural light, thereby improving the color rendering index and TLCI index.

[0051] In one embodiment, when the green LED bead 12 is a green light chip, the green light energy generated by the green light chip is concentrated and the spectral bandwidth is narrow. This limits the light intensity of the second peak of the blue LED bead 13 to less than 65% of the light intensity of the peak wavelength emitted by the blue LED bead 13. This can balance the narrow bandwidth spectrum of the green light and maintain the improved color rendering index and color reproduction capability of the white light source.

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

[0053] In this embodiment, the blue LED bead 13 can be composed of one or more color LED beads. That is, the blue LED bead 13 can be composed of at least one color LED bead from various blue, violet, and ultraviolet LED beads of different wavelengths, combined in a certain proportion. The at least one color LED bead can be connected in series or in parallel, using the same driving circuit.

[0054] In some embodiments, combined with 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 LED chip 13, by using three blue LED chips with different peak wavelengths, can achieve a wider spectral coverage, thereby significantly improving the Spectral Similarity Index (SSI). For example, when the target color temperature is 3200K, the SSI reaches over 90. The combination of different peak wavelengths makes the spectral distribution of the blue LED chip 13 closer to natural light, providing a more realistic and natural lighting environment for applications such as photographic fill light, resulting in more realistic color reproduction and higher detail in photographic works. At the same time, the spectral distribution closer to natural light can reduce eye fatigue and discomfort, improving visual comfort.

[0056] In one embodiment, the spectral shape and intensity distribution of the blue LED chip 13 can be adjusted by changing the power ratio of different wavelength chips. The power ratio of the first chip 131, the second chip 132, and the third chip 133 is 4:5:3. The second chip 132 provides blue light closer to pure blue, and its larger power ratio facilitates achieving a higher color temperature and expanding the color temperature range. This power ratio range allows for flexible adjustment of the color temperature, brightness, and spectral distribution of the blue LED chip 13, resulting in a wider spectral coverage of the white light source while maintaining spectral characteristics similar to natural light. This improves the spectral similarity index of the white light source, optimizes the color rendering index, and enhances visual comfort under natural light.

[0057] In this embodiment, the main peak wavelength of the emitted light from the blue LED bead 13 is between 445nm and 465nm. Shorter wavelength blue light (closer to 445nm) is suitable for applications requiring high brightness and high contrast, while longer wavelength blue light (closer to 465nm) is suitable for applications requiring softer light. For example, when the blue LED bead 13 includes a first bead 131, a second bead 132, and a third bead 133, these three beads are connected in series to achieve a peak wavelength of 400nm to 465nm for the blue LED bead 13.

[0058] In one embodiment, the peak wavelength of the first LED 131 is 407 nm, the peak wavelength of the second LED 132 is 452 nm, and the peak wavelength of the third LED 133 is 460 nm. Since the wavelength 452 nm is closer to the center of pure blue, it is chosen as the peak wavelength of the second LED 132. The first LED 131 and the third LED 133 are selected with shorter wavelengths (407 nm) and longer wavelengths (460 nm), respectively, so that the spectral distribution of the entire blue LED LED 13 is more extensive and uniform.

[0059] It is understood that, in one embodiment, only one of the first LED chip 131, the second LED chip 132, and the third LED chip 133 is selected for the blue LED chip 13, in order to reduce the types of blue LED chips 13 and reduce the number of components and inventory costs of the white light source. In another embodiment, the blue LED chip 13 is two of the first LED chip 131, the second LED chip 132, and the third LED chip 133. By using two blue light chips with different peak wavelengths, the configuration of synthesized white light can be optimized, making the white light closer to natural light. Compared with using three chips with different peak wavelengths, this reduces the types of chips and lowers manufacturing and control costs.

[0060] 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 of these LED beads can be connected in series. Series connection reduces the number and complexity of lines in the circuit, making wiring simpler and clearer, which helps reduce manufacturing difficulty and cost. Furthermore, the series current is the same, reducing abnormal brightness due to uneven current distribution in the circuit and simplifying control. Specifically, multiple red LED beads 11, multiple green LED beads 12, multiple blue LED beads 13, and multiple white LED beads 14 are connected in series.

[0061] 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. Multiple LED beads of any color among the red LED beads 11, green LED beads 12, blue LED beads 13, and white LED beads 14 form at least two branches connected in parallel, which helps reduce the current in the branches and improves safety. For example, multiple red LED beads 11 form four branches, with each branch consisting of six red LED beads 11 connected in series.

[0062] Specifically, if each branch has the same power, then the current in each branch is the same, ensuring that the brightness of each LED is consistent. In this case, the types of LEDs in the branches can be the same or different, and the number of LEDs can be the same or different, as long as the power is the same; there is no single limitation.

[0063] In some embodiments, combined with Figure 7 Multiple blue LED beads 13 form multiple branches, each branch including at least one of a first LED bead 131, a second LED bead 132, and a third LED bead 133, and the multiple branches are connected in parallel. When the overall power of the blue LED beads 13 is large, the parallel connection of multiple branches helps to distribute the total current relatively evenly to each branch, which helps to reduce the current flowing through each branch, and thus reduces the current of the first LED bead 131, the second LED bead 132, and the third LED bead 133 in each branch, thereby improving the safety of use.

[0064] In one embodiment, a second lamp 132 and / or a third lamp 133 are connected in series between two first lamps 131 on the branch, that is, the two first lamps 131 are not arranged adjacently, ensuring that the first lamps 131 are dispersed, so that the spectral distribution of the branch is more uniform and extensive.

[0065] In one embodiment, a first lamp 131 and / or a third lamp 133 are connected in series between two second lamps 132 on the branch, that is, the two second lamps 132 are not arranged adjacently, ensuring that the second lamps 132 are dispersed, so that the spectral distribution of the branch is more uniform and extensive.

[0066] In one embodiment, a first lamp 131 and / or a second lamp 132 are connected in series between two third lamps 133 on the branch, that is, the two third lamps 133 are not arranged adjacently, ensuring that the third lamps 133 are dispersed, so that the spectral distribution of the branch is more uniform and extensive.

[0067] Specifically, each branch circuit includes a first LED 131, a second LED 132, and a third LED 133 connected in series. In each branch circuit, the ratio of the first LED 131, the second LED 132, and the third LED 133 is 1:1:1. On the one hand, having the same type and number of LEDs in each branch circuit simplifies the circuit design and helps reduce manufacturing and control costs. On the other hand, it ensures that each branch circuit has the same power and current, achieving consistent brightness across all LEDs and a more uniform and wider spectral distribution.

[0068] In some embodiments, the peak wavelength of the emitted light from the red LED bead 11 is between 635nm and 655nm, the peak wavelength of the emitted light from the blue LED bead 13 is between 445nm and 465nm, the peak wavelength of the emitted light from the white LED bead 14 is between 580nm and 620nm, and the peak wavelength of the emitted light from the green LED bead 12 is between 510nm and 530nm.

[0069] Based on this, the peak wavelengths of the red LED bead 11, blue LED bead 13, white LED bead 14, and green LED bead 12 are between 630nm~660nm, 445nm~465nm, 580nm~620nm, and 510nm~530nm, respectively. Compared to white light synthesized from three colors, white light synthesized from four colors has a wider color gamut on the chromaticity diagram, and its coordinate points are more flexible and precisely adjustable, basically consistent with or completely consistent with natural white light, ensuring that the color rendering index (CRI) Ra is higher than 96 in the range of 2500K-10000K (see [reference]). Figure 5 ). Figure 5 This diagram shows the light quality parameters of an LED white light source, including average quality parameter test results for two scenarios: one where the green LED chip 12 is a green LED, and another where the green LED chip 12 includes both a first light-emitting chip and a first phosphor. Compared to white light synthesized from five or more colors, LED chips emit fewer colors and require fewer driving paths, which not only reduces manufacturing costs but also facilitates the miniaturization and weight reduction of LED white light sources, improving their portability. See also... Figure 5 The four-color spectrum mixing and superposition provided in this application reduces white light 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. It takes into account the high requirements of color temperature range, color rendering index and TLCI index, and meets the high requirements of TLCI index in the field of photographic lighting.

[0070] In this application, the white light generated by the white LED chip 14 includes a portion of the blue and cyan wavelengths, which is beneficial for improving the TLCI index. Specifically, the color rendering index (CRI) Ra is above 96 in the 2500K-10000K range, allowing for countless four-color spectral combinations; the TLCI index is above 93 in the 2500K-2900K color temperature range, also allowing for countless four-color spectral combinations. Both of these indicators meet the criteria, making direct derivation difficult. In related designs, if the white LED chip 14 of the LED white light source provided in this application is replaced with a yellow LED chip, the peak wavelength of which is 570nm~590nm, combined with... Figure 6 The TLCI index is below 90 in the 2500K-2900K color temperature range and below 95 in the 2900K-20000K color temperature range, which fails to meet the TLCI requirements for photographic lighting. Similarly, in other solutions, replacing any one of the red LED 11, green LED 12, blue LED 13, and white LED 14, or modifying the peak wavelength of the red LED 11, green LED 12, blue LED 13, and white LED 14, makes it difficult to simultaneously meet the high requirements of both color rendering index and TLCI index.

[0071] In this application, the red LED bead 11, the green LED bead 12, the blue LED bead 13, and the white LED bead 14 are all light-emitting beads.

[0072] In some embodiments, combined with Figure 1 and Figure 2 The LED white light source also includes a first substrate 2, which has a light-emitting surface 1, and multiple light-emitting beads are installed in the light-emitting surface 1.

[0073] The first substrate 2 can be a metal substrate or a ceramic substrate.

[0074] In one embodiment, the LED chip can be one or more of flip-chip, flip-chip CSP, and vertical chip technologies. For example, flip-chip technologies can provide better thermal management because the LED chip is directly mounted on the first substrate 2, enabling more efficient heat conduction. Flip-chip CSP technology directly encapsulates the LED chip in a very small package, greatly reducing the size and weight of the white light source. As another example, vertical chips ensure that the light emission direction of the LED chip is perpendicular to the first substrate 2, which is beneficial for beam control and reflection management in optical design.

[0075] Therefore, using flip-chip, flip-chip CSP, or vertical chip as the packaging structure for LED beads can be optimized according to the specific application's thermal management requirements, size limitations, and optical design requirements to achieve higher luminous efficacy, better thermal management, and more suitable optical characteristics, thereby improving the performance and application effect of the light source module.

[0076] Specifically, the LED white light source also includes a second substrate 3, and 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 conductivity and electrical conductivity. By placing the first substrate 2 on the second substrate 3, the heat generated during the operation of the light-emitting beads can be transferred to the second substrate 3 to achieve better thermal management. The second substrate 3 can be connected to an external power source through the wiring socket 32 ​​to allow an external power supply to power the light source; the thermistor 31 on the second substrate 3 is used for temperature detection and thermal management control.

[0077] In one embodiment, multiple LEDs are arranged in a row and column, which helps to save space occupied by the LEDs and facilitates the miniaturization of white light sources.

[0078] In two adjacent rows of LEDs, one row contains two types of LEDs: red LEDs 11, green LEDs 12, blue LEDs 13, and white LEDs 14. The other row contains the remaining two types of LEDs: red LEDs 11, green LEDs 12, blue LEDs 13, and white LEDs 14. This arrangement ensures that the LEDs of each color do not concentrate in a specific area, thus achieving color uniformity across the entire light-emitting surface 1, providing a more consistent and uniform light effect, and producing a more natural and uniform synthetic white light. Furthermore, since each row contains two types of LEDs, it is advantageous to use a single-layer circuit process on the first substrate 2. It can be understood that in other embodiments, each row of LEDs includes four colors of LEDs, in which case the first substrate 2 would use a double-sided, double-layer circuit process.

[0079] For example, when arranging the LED beads, several red LED beads 11 and several green LED beads 12 can be set in the first row, third row, and other odd-numbered rows, while several blue LED beads 13 and several white LED beads 14 can be set in the second row, fourth row, and other even-numbered rows.

[0080] In one embodiment, the light-emitting surface 1 is circular, which allows light to be scattered more widely, thereby covering a larger area and helping to achieve a wider light distribution in lighting applications and reduce the spotting effect.

[0081] Specifically, multiple LED beads cover the light-emitting surface 1, reducing the light blind area and making the light distribution in space more delicate, thus reducing the light spot phenomenon caused by the sparse LED beads.

[0082] Specifically, the multiple light-emitting LED beads arranged along the circumference of the light-emitting surface 1 include red LED beads 11, green LED beads 12, blue LED beads 13 and white LED beads 14, so that the edge of the light-emitting surface 1 is mixed into uniform white light.

[0083] Specifically, among the four consecutive LED beads arranged along the circumference, at least three LED beads are different from each other, which can further improve the uniformity of light effect and color uniformity, so that the light can be mixed evenly.

[0084] Based on this structure, when arranging the LEDs, the colors of the first or last LEDs in two adjacent odd-numbered or even-numbered rows can be different. For example, if the first row of LEDs has red LEDs (11) at the beginning and green LEDs (12) at the end, then the third row can have green LEDs (12) at the beginning and red LEDs (11) at the end. Optionally, the colors of the first LEDs in the second and fourth rows can be the same or different.

[0085] When arranging the LED beads, the two types of LED beads in each row can be arranged alternately in the same or different quantities. For example, in an odd-numbered row of LED beads, one red LED bead 11 and two green LED beads 12 can be arranged alternately, so that the red LED bead 11 is flanked by green LED beads 12 on both sides, and the green LED bead 12 is flanked by red LED beads 11 on one side. Alternatively, one red LED bead 11 and one green LED bead 12 can be arranged alternately, so that the LED beads on both sides are LED beads of different colors.

[0086] This ensures that LEDs of different colors can be placed adjacent to each other, allowing the light emitted by the light source to mix more evenly and producing a uniform light output. Furthermore, the number and color combination of the LEDs can be adjusted according to specific lighting needs to achieve specific lighting effects or meet different application requirements.

[0087] Furthermore, in the multiple LEDs arranged in adjacent rows, one row includes red LEDs 11 and green LEDs 12, while the other row includes blue LEDs 13 and white LEDs 14. The light emitted by the red LEDs 11 and green LEDs 12 mixes to produce yellow light, while the light emitted by the blue LEDs 13 and white LEDs 14 mixes to adjust the overall color temperature of the light source. Therefore, placing the red LEDs 11 and green LEDs 12 in one row and the blue LEDs 13 and white LEDs 14 in another row, with adjacent rows of different colored LEDs, reduces the area dominated by a single color, resulting in a more uniform color distribution of the light source. In addition, the red-green and blue-white combinations complement each other, optimizing the color mixing effect. By adjusting the ratio of red-green and blue-white LEDs, more precise color control can be achieved.

[0088] Furthermore, red LED beads 11, green LED beads 12, blue LED beads 13 and white LED beads 14 are evenly distributed in the light-emitting surface 1, and LED beads of any color are symmetrically distributed in the light-emitting surface 1.

[0089] Specifically, the symmetrical distribution of LED beads of any color about the center of the light-emitting surface 1 in the row direction X and / or the column direction Y about the center of the light-emitting surface 1 can improve the uniformity of light mixing, increase optical utilization, and reduce the cost of subsequent optical processing.

[0090] In some embodiments, combined with Figure 7 The LED white light source 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, which are electrically connected to the control unit 4. The first driving circuit 41 is electrically connected to a red LED bead 11, the second driving circuit 42 is electrically connected to a green LED bead 12, the third driving circuit 43 is electrically connected to a blue LED bead 13, and the fourth driving circuit 44 is electrically connected to a white LED bead 14. In this embodiment, the red LED bead 11, green LED bead 12, blue LED bead 13, and white LED bead 14 are independent of each other. The control unit 4 independently adjusts the on / off state and current of the red LED bead 11, green LED bead 12, blue LED bead 13, and white LED bead 14 through the first driving circuit 41, second driving circuit 42, third driving circuit 43, and fourth driving circuit 44 to form white light with adjustable color temperature.

[0091] 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 within the protection scope of the present invention.

Claims

1. A white LED light source, characterized in that: The white LED light source includes red LED beads (11), green LED beads (12), blue LED beads (13) and white LED beads (14) that are controlled independently. The green LED bead (12) includes a first light-emitting chip and a first phosphor covering the first light-emitting chip. The first light-emitting chip is a blue light chip, and the first phosphor is a green phosphor. The ratio of the luminous flux of the red LED bead (11), the green LED bead (12), the blue LED bead (13), and the white LED bead (14) is 1.8~2.0:12~13:1:14~15. 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. Multiple blue LED beads (13) form multiple branches, each branch including at least one of the first LED bead (131), the second LED bead (132) and the third LED bead (133), and the multiple branches are connected in parallel to each other; The white LED bead (14) emits light with a Duv range of +0.005 to +0.

015.

2. The LED white light source according to claim 1, characterized in that: The red LED bead (11) includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, wherein the peak wavelength of the second phosphor is between 635nm and 660nm.

3. The LED white light source according to claim 2, characterized in that: The white LED bead (14) includes 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 580nm and 620nm.

4. The LED white light source according to claim 3, characterized in that: The third light-emitting chip is the same as the second light-emitting chip; and / or, the third phosphor includes at least one of green phosphor, orange phosphor and red phosphor.

5. The LED white light source according to claim 1, characterized in that: The white LED bead (14) emits light with a color temperature range of 2850K~3250K.

6. The LED white light source according to claim 1, characterized in that: The power ratio of the first LED (131), the second LED (132), and the third LED (133) is 4:5:3; And / or, the peak wavelength of the first LED (131) is 407nm, the peak wavelength of the second LED (132) is 452nm, and the peak wavelength of the third LED (133) is 460nm.

7. The LED white light source according to claim 1, characterized in that: The main peak wavelength of the blue LED bead (13) is between 445nm and 465nm; The spectrum of the blue LED bead (13) also includes a secondary peak with a wavelength of 400nm~420nm.

8. The LED white light source according to claim 1, characterized in that: The peak wavelength of the green LED bead (12) is between 510nm and 530nm.

9. The LED white light source according to any one of claims 1 to 8, characterized in that: The white LED light source also includes a first substrate (2), which has a light-emitting surface (1). The red LED bead (11), the green LED bead (12), the blue LED bead (13), and the white LED bead (14) are all light-emitting beads, and a plurality of the light-emitting beads are installed in the light-emitting surface (1). Multiple LED beads are arranged in a row and column pattern; in two adjacent rows of LED beads, one row is arranged with two of the following: red LED beads (11), green LED beads (12), blue LED beads (13) and white LED beads (14); the other row is arranged with the other two of the following: red LED beads (11), green LED beads (12), blue LED beads (13) and white LED beads (14). The light-emitting surface (1) is circular; a plurality of light-emitting LED beads cover the light-emitting surface (1); the plurality of light-emitting LED beads arranged along the circumference of the light-emitting surface (1) include the red LED bead (11), the green LED bead (12), the blue LED bead (13) and the white LED bead (14); among the four consecutive light-emitting LED beads arranged along the circumference, at least three of the light-emitting LED beads are different from each other.

Images