LED white light source

Abstract

The invention relates to the technical field of illumination, and provides an LED white light source which comprises a red light LED lamp bead, a green light LED lamp bead, a blue light LED lamp bead and a white light LED lamp bead which are independently controlled. When the green light LED lamp beads are green light chips, the luminous flux ratio of the red light LED lamp beads to the green light LED lamp beads to the blue light LED lamp beads to 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 bead comprises a first light-emitting chip and first fluorescent powder covering the first light-emitting chip, the luminous flux ratio of the red-light LED lamp bead to the green-light LED lamp bead to the blue-light LED lamp bead to the white-light LED lamp bead is (1.8-2.0): (12-13): 1: (14-15). Tests show that the white light source is high in power consistency under different color temperatures, the technical problem that the luminous efficiency of an existing LED white light source needs to be improved is solved, and energy efficiency optimization is facilitated.

Description

Technical Field

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

[0002] LED white light sources are widely used in home lighting, commercial lighting, stage lighting, film and television shooting, theater studio lighting, museum lighting, medical lighting, plant growth lighting, etc. As people pay more attention to the comfort of 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 getting higher and higher.

[0003] LED white light sources include lamp beads of various colors, and each color lamp bead has a different light color. The white light emitted by LED white light sources is a combination of multiple colors of light, and the different luminous flux combinations of multiple color lamp beads, in order to meet the color temperature range of white light, lead to a huge difference in the final luminous efficiency. The existing white light formed by the luminous flux combination has a technical problem that the luminous efficiency needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide an LED white light source, aiming to solve the technical problem that the existing LED white light source has a need to improve the luminous efficiency.

[0005] The present application provides an LED white light source, the LED white light source comprising red light LED lamp beads, green light LED lamp beads, blue light LED lamp beads and white light LED lamp beads that are independently controlled from each other;

[0006] Wherein, when the green light LED lamp bead is a green light chip, the ratio of the luminous flux of the red light LED lamp bead, the green light LED lamp bead, the blue light LED lamp bead and the white light LED lamp bead is 1.8-2.0:5.5-5.6:1:15-16;

[0007] Alternatively, when the green LED lamp bead includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous fluxes of the red LED lamp bead, the green LED lamp bead, the blue LED lamp bead and the white LED lamp bead is 1.8-2.0:12-13:1:14-15.

[0008] In one of the embodiments, the red LED lamp bead includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, and the peak wavelength of the second phosphor is between 635nm and 660nm.

[0009] In one of the embodiments, 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 580nm and 620nm.

[0010] 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.

[0011] In one of the embodiments, the color temperature range of the light emitted by the white light LED lamp bead is 2850K to 3250K; and / or the Duv range of the light emitted by the white light LED lamp bead is +0.005 to +0.015.

[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; and / or the peak wavelength of the first lamp bead is 407nm, the peak wavelength of the second lamp bead is 452nm, and the peak wavelength of the third lamp bead is 460nm.

[0014] In one of the embodiments, the main peak wavelength of the light emitted by the blue LED lamp bead is between 445nm and 465nm.

[0015] In one of the embodiments, the spectrum of the blue light LED lamp bead also includes a secondary peak with a wavelength of 400nm to 420nm.

[0016] In one of the embodiments, when the green LED lamp bead is the green chip, the sub-peak light intensity of the blue LED lamp bead is less than 65% of the light intensity of the peak wavelength of the blue LED lamp bead.

[0017] In one of the embodiments, when the green LED lamp bead includes the first light-emitting chip and the first phosphor, the sub-peak light intensity of the blue LED lamp bead is 90% to 100% of the light intensity of the peak wavelength of the blue LED lamp bead.

[0018] In one of the embodiments, the peak wavelength of the green LED lamp bead is between 510nm and 530nm.

[0019] In one embodiment, the LED white light source also includes a first substrate having a light-emitting surface, and the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads are all light-emitting lamp beads, and a plurality of the light-emitting lamp beads are installed in the light-emitting surface.

[0020] In one embodiment, the plurality of light-emitting lamp beads are distributed in a matrix; in two adjacent rows of the light-emitting lamp beads, one row is arranged with two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads, and the other row is arranged with the other two of the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads.

[0021] In one embodiment, the light-emitting surface is circular; the plurality of light-emitting lamp beads cover the light-emitting surface; the plurality of light-emitting lamp beads arranged along the circumference of the light-emitting surface include 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. Among the four consecutive light-emitting lamp beads arranged along the circumference, at least three of the light-emitting lamp beads are different from each other.

[0022] The beneficial effects of the LED white light source provided by the present invention are as follows: the red light LED lamp beads, the green light LED lamp beads, the blue light LED lamp beads and the white light LED lamp beads are independently controlled to emit light, and the mixed light forms white light with adjustable color temperature, so that the white light can be dimmed 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, accurately adjustable, and basically consistent with or completely consistent with natural white light; 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 the miniaturization and lightweight of the white light source; when the green light LED lamp beads are green light chips , the ratio of the luminous flux of the red LED lamp beads, the green LED lamp beads, the blue LED lamp beads and the white LED lamp beads is 1.8-2.0:5.5-5.6:1:15-16; when the green LED lamp beads include the first light-emitting chip and the first phosphor, the ratio of the luminous flux of the red LED lamp beads, the green LED lamp beads, the blue LED lamp beads and the white LED lamp beads is 1.8-2.0:12-13:1:14-15; after testing, the white light source has high power consistency and high luminous efficiency at different color temperatures, which solves the technical problem that the luminous efficiency of the existing LED white light source needs to be improved, thereby facilitating energy efficiency optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0024] Figure 1A schematic diagram of the structure of an LED white light source provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of another structure of an LED white light source provided by an embodiment of the present invention;

[0026] Figure 3 A first spectrum combination diagram of the LED white light source provided by an embodiment of the present invention;

[0027] Figure 4 A second spectrum combination diagram of the LED white light source provided by an embodiment of the present invention;

[0028] Figure 5 A light quality parameter diagram of an LED white light source provided by an embodiment of the present invention;

[0029] Figure 6 is a light quality parameter diagram in the related art;

[0030] Figure 7 A circuit diagram of an LED white light source provided in an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 1. Light-emitting surface; 11. Red light LED lamp bead; 12. Green light LED lamp bead; 13. Blue light LED lamp bead; 131. First lamp bead; 132. Second lamp bead; 133. Third lamp bead; 14. White light 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

[0033] Embodiments of the present invention are described in detail below, 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 should not be construed as limiting the present invention.

[0034] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0035] 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 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 a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Combination Figure 1 and Figure 2 , the present application provides an LED white light source. The LED white light source includes a red LED lamp bead 11, a green LED lamp bead 12, a blue LED lamp bead 13 and a white LED lamp bead 14 which are independently controlled. The red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 are independently controlled to emit light, and the mixed light forms white light with adjustable color temperature, so as to achieve 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, accurately adjustable, and basically or completely consistent with natural white light; compared with the white light synthesized by five colors or more, the lamp bead has fewer color types and fewer driving paths, which is conducive to the miniaturization and lightweighting of the white light source.

[0039] In some embodiments, when the green LED lamp bead 12 is a green chip, the ratio of the luminous flux 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 relatively low, balancing the overall light effect.

[0040] In other embodiments, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous flux of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 is 1.8-2.0:12-13:1:14-15. Compared with the light-emitting mode in which the green LED lamp bead 12 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 by the first light-emitting chip, and the brightness of the green LED lamp bead 12 used 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 enough 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 a relatively high luminous flux to provide stable and efficient light output. Therefore, such a luminous flux ratio setting can improve the overall light efficiency of the light source and reduce energy consumption while providing high-quality lighting. The blue LED lamp bead 13 plays a major role in achieving high color temperature, but has a small role in achieving other color temperature values. By reducing its brightness ratio 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 LED white light source is basically consistent at different color temperatures, which is conducive to energy efficiency optimization.

[0041] After testing, in the above two luminous flux ratios, the LED white light source has high power consistency and high luminous efficiency 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 luminous flux 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.

[0042] The required luminous flux ratio can be achieved by selecting lamp beads with different brightness and power characteristics. Specifically, lamp beads with different light outputs (luminous fluxes) can be selected to achieve the required luminous flux ratio directly through the luminous flux differences of the lamp beads themselves. Alternatively, lamp beads with different powers can be selected. Since lamp beads with different powers will produce different brightness under the same current, the required luminous flux ratio can be achieved.

[0043] 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.

[0044] Figure 3 and Figure 4 In the figure, arrow B points to the spectrum curve of the blue light LED lamp bead 13, arrow G points to the spectrum curve of the green light LED lamp bead 12, arrow W points to the spectrum curve of the white light LED lamp bead 14, and arrow R points to the spectrum curve of the red light LED lamp bead 11.

[0045] In some embodiments, in combination Figure 1 , Figure 3 and Figure 4 ,Although Figure 3 and Figure 4 The spectrum shapes of the green LED lamp beads 12 are different, but the peak wavelengths of the green LED lamp beads 12 are all between 510nm and 530nm, making the green light purer and more saturated. The peak wavelength of the green LED lamp beads 12 is stable within this range, which helps to ensure that the green LED lamp beads 12 from different batches and under different production conditions remain highly consistent in color.

[0046] Specifically, when the green LED lamp bead 12 is a green light chip, the spectrum of the green LED lamp bead 12 includes a first band with a wavelength less than 505nm and a wavelength 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 lamp bead 12, so as to quickly reduce the light intensity of non-peak wavelengths and reduce stray light.

[0047] Specifically, when the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor, the spectrum of the green LED lamp bead 12 includes a second band with a wavelength less than 492nm and a wavelength greater than 585nm, and 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 lamp bead 12, thereby broadening the spectral intensity of the green LED lamp bead 12 and making the green light have a higher color rendering index and TLCI index.

[0048] In some embodiments, in combination Figure 1 , Figure 3 and Figure 4 The red LED lamp bead 11 includes a second light-emitting chip and a second phosphor covering the second light-emitting chip, and the peak wavelength of the second phosphor is between 635nm and 660nm. The peak wavelength of the second phosphor is stable within this range, which helps to ensure that the red LED lamp beads 11 of different batches and different production conditions remain highly consistent in color.

[0049] 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.

[0050] In one embodiment, in combination Figure 1 , Figure 3 and Figure 4 When the green LED lamp bead 12 is a green chip, the spectrum bandwidth of the green LED lamp bead 12 is narrow, and the spectrum of the red LED lamp bead 11 includes a third band with a wavelength less than 630nm and a wavelength greater than 678nm. The light intensity of the third band (see Figure 3 The vertical coordinate) is less than or equal to 80% of the light intensity of the peak wavelength of the red light LED lamp bead 11, which 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 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.

[0051] In other embodiments, in combination Figure 1 , Figure 3 and Figure 4 When the green LED lamp bead 12 includes the first light-emitting chip and the first phosphor, the spectrum bandwidth of the green LED lamp bead 12 is relatively wide, and the spectrum of the red LED lamp bead 11 includes a fourth band with a wavelength less than 621nm and a wavelength greater than 663nm. The light intensity of the fourth band (see Figure 4 The vertical coordinate) is less than or equal to 80% of the light intensity of the peak wavelength of the red light LED lamp bead 11, limiting the light intensity of the non-peak wavelength of the red light, broadening the red light band to balance with the wide bandwidth spectrum of the green light, so that the synthesized white light is closer to natural white light.

[0052] In some embodiments, in combination Figure 1 , Figure 3 and Figure 4 The white light 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 light LED lamp bead 14 of different batches and different production conditions maintains a high degree of consistency in color and meets the requirements of high-end applications for TLCI.

[0053] Optionally, combined Figure 3 and Figure 4 The light intensity of the 550nm to 650nm wavelength of the white light LED lamp bead 14 is greater than or equal to 60% of the light intensity of the peak wavelength of the white light LED lamp bead 14, which broadens the light intensity of the red light and the cyan light in the white light, and is beneficial to improving the TLCI index of the synthetic white light.

[0054] 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.

[0055] Optionally, the third light-emitting chip is the same as the second light-emitting chip, thereby reducing the types of materials to be prepared.

[0056] 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 light LED lamp bead 14 can be controlled, and a larger Duv range can be achieved to enhance the color rendering index.

[0057] 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 due to mixed light of multiple single light LED lamp beads.

[0058] In some embodiments, the Duv value represents the color difference between the light source color and the black body 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 within the color temperature of 2850K to 3250K will be too high; if Duv is higher than +0.015, the light power above 3250K will be too high.

[0059] In some embodiments, in combination Figure 1 , Figure 3 and Figure 4 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, so that the mixed white light is closer to the spectral characteristics of natural light, so as to improve the color rendering index and TLCI index.

[0060] In one of the embodiments, when the green light LED lamp bead 12 is a green light chip, since the green light energy generated by the green light chip is concentrated and the spectral bandwidth is narrow, the sub-peak light intensity of the blue light LED lamp bead 13 is limited to less than 65% of the light intensity of the peak wavelength emitted by the blue light LED lamp bead 13, which can be balanced with the narrow bandwidth spectrum of the green light, thereby maintaining the improved color rendering index and color reproduction ability of the white light source.

[0061] 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 light intensity of the blue LED lamp bead 13 is 90% to 100% of the light intensity of the peak wavelength emitted by the blue LED lamp bead 13, which can be balanced with the wide bandwidth spectrum of the green light, thereby maintaining the improved color rendering index and color reproduction ability of the white light source.

[0062] In this embodiment, the blue LED lamp bead 13 can be composed of one or more than one color lamp bead, that is, the blue LED lamp bead 13 can be composed of at least one color lamp bead of blue light, purple light, and ultraviolet lamp beads of multiple different wavelength bands in proportion. At least one color lamp bead can be connected in series or in parallel and use the same driving circuit.

[0063] In some embodiments, in combination Figure 7 The blue light LED lamp bead 13 includes a first lamp bead 131, a second lamp bead 132 and a third lamp bead 133. The peak wavelength of the first lamp bead 131 is 400nm~410nm, the peak wavelength of the second lamp bead 132 is 445nm~455nm, and the peak wavelength of the third lamp bead 133 is 455nm~465nm.

[0064] Based on this, the blue light LED lamp bead 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 bead 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 that is closer to natural light can reduce eye fatigue and discomfort and improve people's visual comfort.

[0065] In one of the embodiments, the spectral shape and intensity distribution of the blue LED lamp bead 13 can be adjusted by adjusting the power ratio of lamp beads with 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 spectrum 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.

[0066] In this embodiment, the main peak wavelength of the light emitted by the blue LED lamp bead 13 is between 445nm and 465nm. Blue light with a shorter wavelength (close to 445nm) is suitable for application scenarios with high brightness and high contrast, while blue light with a longer wavelength (close to 465nm) is suitable for application scenarios with soft light. 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 400nm to 465nm.

[0067] In one embodiment, the peak wavelength of the first lamp bead 131 is 407nm, the peak wavelength of the second lamp bead 132 is 452nm, and the peak wavelength of the third lamp bead 133 is 460nm. Since the wavelength 452nm is closer to the center of pure blue, it is selected as the peak wavelength of the second lamp bead 132. The first lamp bead 131 and the third lamp bead 133 respectively use a shorter wavelength (407nm) and a longer wavelength (460nm), so that the spectrum distribution of the entire blue light LED lamp bead 13 is more extensive and uniform.

[0068] It can be understood that in one embodiment, the blue LED lamp bead 13 only selects one of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 to reduce the types of blue LED lamp beads 13 and reduce the number of components and stocking costs of the white light source. In another embodiment, the blue LED lamp bead 13 is two of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133. Through 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, and compared with using three lamp beads with different peak wavelengths, it is beneficial to reduce the types of lamp beads and reduce manufacturing costs and control costs.

[0069] 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, which reduces the abnormality of uneven brightness caused by uneven current distribution in the circuit, and simplifies the difficulty of regulation. Specifically, multiple red LED lamp beads 11 are arranged in series, multiple green LED lamp beads 12 are arranged in series, multiple blue LED lamp beads 13 are arranged in series, and multiple white LED lamp beads 14 are arranged in series.

[0070] 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 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 form at least two branches arranged in parallel, which is beneficial to reduce the current of the branch and improve the safety of use. For example, multiple red LED lamp beads 11 form four branches, and each branch is composed of six red LED lamp beads 11 connected in series.

[0071] 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. At this time, 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, as long as the power is the same, which is not limited here.

[0072] In some embodiments, in combination Figure 7 , multiple blue LED lamp beads 13 form multiple branches, each branch includes at least one of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133, and the multiple branches are connected in parallel. When the overall power of the blue LED lamp bead 13 is large, multiple branches are arranged in parallel, which is conducive to relatively evenly distributing the total current to each branch, and is conducive to reducing the current flowing through each branch, thereby reducing the current of the first lamp bead 131, the second lamp bead 132 and the third lamp bead 133 on each branch, and improving the safety of use.

[0073] 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.

[0074] 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 dispersedly arranged, making the spectral distribution of the branch more uniform and extensive.

[0075] In one embodiment, the first lamp bead 131 and / or the second lamp bead 132 are connected in series between 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.

[0076] Specifically, each branch includes a first lamp bead 131, a second lamp bead 132, and a third lamp bead 133 connected in series. In each branch, the number 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 lamp beads of the branch are of the same type and quantity, and the circuit design is more concise, which is conducive to reducing the manufacturing cost and the regulation cost; on the other hand, it ensures that the power and current of each branch are the same, so that the brightness of each lamp bead is consistent, and the spectrum distribution is more uniform and extensive.

[0077] In some embodiments, the peak wavelength of the light emitted by the red LED lamp bead 11 is between 635nm and 655nm, the main peak wavelength of the light emitted by the blue LED lamp bead 13 is between 445nm and 465nm, the peak wavelength of the light emitted by the white LED lamp bead 14 is between 580nm and 620nm. The peak wavelength of the light emitted by the green LED lamp bead 12 is between 510nm and 530nm.

[0078] Based on this, the peak wavelengths of the red LED lamp bead 11, the blue LED lamp bead 13, the white LED lamp bead 14, and the green LED lamp bead 12 are between 630nm and 660nm, 445nm and 465nm, 580nm and 620nm, and 510nm and 530nm, respectively. Compared with the three-color synthesized white light, the four-color synthesized white light has a larger color gamut on the chromaticity diagram, and its coordinate points are more flexible, accurately adjustable, and basically or completely consistent with natural white light, ensuring that the Ra of the color rendering index CRI is higher than 96 in the range of 2500K-10000K (see Figure 5 ). Figure 5 The light quality parameter diagram of the LED white light source includes the average quality parameter test results of the two cases where the green LED lamp bead 12 is a green light chip and the green LED lamp bead 12 includes a first light-emitting chip and a first phosphor. Compared with the white light synthesized by five or more colors, the light emitted by the LED lamp bead has fewer color types and fewer driving paths, which not only reduces the manufacturing cost, but also facilitates the miniaturization and lightness of the LED white light source, improving its portability. Figure 5 The four-color spectrum mixing and superposition provided in this application reduces the deviation and fluctuation of white light, 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, 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.

[0079] In the present application, 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 beneficial to improve the TLCI index. Among them, 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, and these two indicators are both met, which is difficult to derive directly. In the related design, if the white light LED lamp bead 14 of the LED white light source provided in the present application is replaced with a yellow light LED lamp bead, the peak wavelength of the yellow light LED lamp bead is 570nm~590nm, combined with Figure 6 , the TLCI index is lower than 90 in the color temperature range of 2500K-2900K, and lower than 95 in the color temperature range of 2900K-20000K, which cannot meet the TLCI requirements of photographic lighting. Similarly, in other solutions, replacing any one of the red LED lamp beads 11, green LED lamp beads 12, blue LED lamp beads 13 and white LED lamp beads 14, or modifying the peak wavelength of the red LED lamp beads 11, green LED lamp beads 12, blue LED lamp beads 13 and white LED lamp beads 14, it is difficult to take into account the high requirements of the color rendering index and the TLCI index at the same time.

[0080] In the present 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.

[0081] In some embodiments, in combination Figure 1 and Figure 2 The LED white light source also includes a first substrate 2 , which has a light-emitting surface 1 , and a plurality of light-emitting lamp beads are installed in the light-emitting surface 1 .

[0082] The first substrate 2 can be a metal substrate or a ceramic substrate.

[0083] In one embodiment, the light-emitting lamp bead can be one or more of a flip chip, a flip CSP, and a vertical chip. For example, a flip chip can provide better thermal management capabilities because the LED chip is directly mounted on the first substrate 2 and can conduct heat more effectively. The flip CSP technology directly encapsulates the LED chip in a very small package, greatly reducing the volume and weight of the white light source. For another example, the vertical chip makes the light emission direction of the LED chip perpendicular to the first substrate 2, which is beneficial to beam control and reflection management in optical design.

[0084] 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 requirements, 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.

[0085] Specifically, the LED white light source also includes a second substrate 3, and a wiring socket 32 ​​and a thermistor 31 arranged on the second substrate 3. The second substrate 3 can be a copper substrate, which has excellent thermal conductivity and electrical conductivity. The first substrate 2 is arranged on the second substrate 3, and the heat generated during the operation of the light-emitting lamp beads can be transferred to the second substrate 3 to achieve better thermal management. The second substrate 3 can be electrically connected to the outside through the wiring socket 32 ​​so that an external power supply can supply power to the light source; the thermistor 31 on the second substrate 3 is used to achieve temperature detection and thermal management control.

[0086] In one of the embodiments, a plurality of light emitting lamp beads are distributed in a matrix, which helps to save the space occupied by the light emitting lamp beads and facilitates the miniaturized design of the white light source.

[0087] In 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 will not be concentrated in a specific area, thereby achieving color uniformity of the entire light-emitting surface 1, providing more consistent and uniform light effects, and producing more natural and uniform synthetic white light. In addition, there are two types of light-emitting lamp beads in each row, which is conducive to the first substrate 2 adopting a single-layer circuit process. 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.

[0088] For example, when arranging the light-emitting lamp beads, a plurality of red LED lamp beads 11 and a plurality of green LED lamp beads 12 can be arranged in the first row, the third row and other odd rows, and a plurality of blue LED lamp beads 13 and a plurality of white LED lamp beads 14 can be arranged in the second row, the fourth row and other even rows.

[0089] In one of the embodiments, 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.

[0090] Specifically, a plurality of light-emitting lamp beads are distributed all over the light-emitting surface 1, which reduces blind areas of illumination, makes the distribution of light in space more delicate, and reduces the light spot phenomenon caused by sparse light-emitting lamp beads.

[0091] Specifically, the plurality of light-emitting lamp beads arranged along the circumferential direction of the light-emitting surface 1 include red light LED lamp beads 11, green light LED lamp beads 12, blue light LED lamp beads 13 and white light LED lamp beads 14, so that the edge of the light-emitting surface 1 is mixed into uniform white light.

[0092] Specifically, 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, thereby further improving the uniformity of the light effect and the uniformity of the color, so that the light can be mixed evenly.

[0093] On the basis of this structure, when arranging the light-emitting lamp beads, the colors of the first end light-emitting lamp beads or the tail end light-emitting lamp beads of two adjacent odd or even rows can be set differently. For example, the first end light-emitting lamp beads of the first row of light-emitting lamp beads are set to red light LED lamp beads 11, and the tail end light-emitting lamp beads are set to green light LED lamp beads 12, then the first end light-emitting lamp beads of the third row of light-emitting lamp beads can be set to green light LED lamp beads 12, and the tail end light-emitting lamp beads can be set to red light LED lamp beads 11. Optionally, the color of the first end lamp beads of the second row of lamp beads can be the same as or different from the color of the first end lamp beads of the fourth row of lamp beads.

[0094] 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 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.

[0095] Thus, it is ensured that the light-emitting lamp beads of different colors can be adjacent to each other, so that the light emitted by the light source can be mixed more evenly, which is conducive to producing uniform light color output. In addition, the number distribution and color combination of the light-emitting lamp beads can be adjusted according to specific lighting needs to achieve specific lighting effects or meet different application needs.

[0096] Further, 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. Among them, the light emitted by the red LED lamp beads 11 and the green LED lamp beads 12 are mixed to produce yellow light, and the light emitted by the blue LED lamp beads 13 and the white LED lamp beads 14 are mixed to adjust the overall color temperature of the light source. Therefore, the red LED lamp beads 11 and the green LED lamp beads 12 are arranged in the same row, and the blue LED lamp beads 13 and the white LED lamp beads 14 are arranged in another row. The arrangement of the light-emitting lamp beads of different colors in adjacent rows can reduce the area dominated by a single color, so that the color distribution of the light source is more uniform. In addition, the red-green combination and the blue-white combination complement each other, which can optimize the color mixing effect. By adjusting the ratio of the red-green and blue-white lamp beads, more accurate color control can be achieved.

[0097] 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 .

[0098] 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.

[0099] In some embodiments, in combination Figure 7 The LED 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 electrically connected to the control unit 4, 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 current of the red LED lamp bead 11, the green LED lamp bead 12, the blue LED lamp bead 13 and the white LED lamp bead 14 through the first drive circuit 41, the second drive circuit 42, the third drive circuit 43 and the fourth drive circuit 44 to form white light with adjustable color temperature.

[0100] 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 protection scope of the present invention.

Claims

1. An LED white light source, characterized in that: The LED white light source comprises red light LED lamp beads (11), green light LED lamp beads (12), blue light LED lamp beads (13) and white light LED lamp beads (14) which are independently controlled from each other; Wherein, when the green light LED lamp bead (12) is a green light chip, the ratio of the luminous flux of 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) is 1.8-2.0:5.5-5.6:1:15-16; Alternatively, when the green LED lamp bead (12) comprises a first light-emitting chip and a first phosphor covering the first light-emitting chip, the ratio of the luminous fluxes of the red LED lamp bead (11), the green LED lamp bead (12), the blue LED lamp bead (13) and the white LED lamp bead (14) is 1.8-2.0:12-13:1:14-15.

2. The LED white light source according to claim 1, characterized in that: 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.

3. The LED white light source according to claim 2, characterized in that: The white light LED lamp bead (14) comprises 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.

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 color temperature range of the light emitted by the white light LED lamp bead (14) is 2850K to 3250K; and / or the Duv range of the light emitted by the white light LED lamp bead (14) is +0.005 to +0.

015.

6. The LED 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); 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.

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

8. The LED white light source according to claim 1, characterized in that: The main peak wavelength of the blue light LED lamp bead (13) is between 445nm and 465nm; The spectrum of the blue light LED lamp bead (13) also includes a secondary peak with a wavelength of 400nm to 420nm; When the green LED lamp bead (12) is the green chip, the sub-peak light intensity of the blue LED lamp bead (13) is less than 65% of the light intensity of the peak wavelength of the blue LED lamp bead (13); When the green LED lamp bead (12) comprises the first light-emitting chip and the first phosphor, the sub-peak light intensity of the blue LED lamp bead (13) is 90% to 100% of the light intensity of the peak wavelength of the blue LED lamp bead (13).

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

10. The LED white light source according to any one of claims 1 to 9, characterized in that: The LED white light source further comprises a first substrate (2), the first substrate (2) having a light-emitting surface (1), 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, and a plurality of the light-emitting lamp beads are installed in the light-emitting surface (1); The plurality of light-emitting lamp beads are arranged in a determinant pattern; in two adjacent rows of the light-emitting lamp beads, one row is arranged with two of the red light LED lamp beads (11), the green light LED lamp beads (12), the blue light LED lamp beads (13) and the white light LED lamp beads (14), and the other row is arranged with the other two of the red light LED lamp beads (11), the green light LED lamp beads (12), the blue light LED lamp beads (13) and the white light LED lamp beads (14); The light-emitting surface (1) is circular; the plurality of light-emitting lamp beads cover the entire light-emitting surface (1); the plurality of light-emitting lamp beads arranged along the circumferential direction of the light-emitting surface (1) include the red light LED lamp beads (11), the green light LED lamp beads (12), the blue light LED lamp beads (13) and the white light LED lamp beads (14); and among the four consecutive light-emitting lamp beads arranged along the circumferential direction, at least three of the light-emitting lamp beads are different from each other.

Images