Tunable circadian rhythm factor LED structure and packaging method therefor

Abstract

The present invention belongs to the technical field of LEDs, and particularly relates to a tunable circadian rhythm factor LED structure and a packaging method therefor. The tunable circadian rhythm factor LED structure comprises a support, a reflector cup, fluorescent glue and a plurality of LED chips, wherein the support has four corners, and the support is provided with a first negative electrode, a second negative electrode, a first positive electrode and a second positive electrode respectively at its four corners; the reflector cup is arranged on the periphery of the top of the support; and the LED chips are packaged at the top of the support by means of the fluorescent glue and are located in the reflector cup, and the position layout of each LED chip is configured to comprise a rest-state light source group and a working-state light source group. The tunable circadian rhythm factor LED structure of the present invention is designed to integrate both rest-state and working-state light sources. By means of adjusting different current inputs, spectral tuning of the light sources can be performed, allowing variation of a circadian rhythm factor M / P ratio parameter and adjustment of Ra (a color rendering index), thereby meeting the requirements of different application scenarios, and meeting the demands of dynamic lighting design.

Description

Rhythm factor adjustable LED structure and packaging method thereof Technical Field

[0001] The present invention belongs to the technical field of LEDs, and in particular relates to a rhythm factor adjustable LED structure and a packaging method thereof. Background Art

[0002] Since the Industrial Revolution, more and more of our daily lives have taken place indoors, including in schools, offices, retail stores, entertainment venues, factories, and homes. Artificial lighting is now ubiquitous and often replaces the natural light that once regulated our circadian rhythms. Poor lighting design can disrupt our circadian rhythms, impacting not only personal health but also broader productivity and workplace safety. Therefore, understanding how to provide appropriate lighting in homes, schools, and workplaces to better promote physical and mental health and enhance productivity is crucial.

[0003] In recent decades, new research into how light affects human alertness, mood, sleep patterns, and productivity has paralleled the development of new LED products. These new LEDs enable carefully tuned lighting solutions that provide the optimal intensity (brightness) and color (chromaticity) for a wide range of human activities. Human-centered lighting (HCL) is an emerging science that focuses on understanding how light affects us and how to design appropriate lighting solutions to support and enhance human function and health.

[0004] Humanized lighting science is helping us understand how dark vision works and how the human body responds to light of varying characteristics. A key consideration is the wavelength distribution, or spectral power distribution (SPD), of a light source. The human circadian rhythm system is triggered by the presence or absence of wavelengths in the cyan / blue range of the spectrum. These wavelengths are prevalent in daylight during the day and can increase alertness and concentration, as well as improve our mood. Summary of the Invention

[0005] The purpose of the present invention is to provide a rhythm factor adjustable LED structure and its packaging method, aiming to solve the technical problem that the LED packaging structure in the prior art cannot effectively meet the design of the rest state and working state light sources as one, and can adjust the spectrum of the light source by adjusting different current inputs.

[0006] To achieve the above objectives, an embodiment of the present invention provides a rhythm factor adjustable LED structure, comprising a bracket, a bowl, fluorescent glue, and a plurality of LED chips. The bracket has four corners, and the bracket is respectively provided with a first cathode, a second cathode, a first anode, and a second anode at the four corners. The first cathode is arranged diagonally with the first anode, and the second cathode is arranged diagonally with the second anode. The bowl is arranged on the outer periphery of the top of the bracket, and each LED chip is encapsulated on the top of the bracket by the fluorescent glue and is located within the bowl;

[0007] The plurality of LED chips include a first LED chip with a dominant wavelength of 440-445 nm, a second LED chip with a peak wavelength of 425-430 nm, a third LED chip with a peak wavelength of 365-370 nm, a fourth LED chip with a peak wavelength of 405-410 nm, a fifth LED chip with a dominant wavelength of 442-447 nm, a sixth LED chip with a dominant wavelength of 450-455 nm, a seventh LED chip with a dominant wavelength of 460-465 nm, and an eighth LED chip with a peak wavelength of 380-385 nm. The position layout of each of the LED chips is set to include a resting state light source group and an operating state light source group.

[0008] The resting-state light source group includes: four first LED chips and two second LED chips, with two first LED chips and one second LED chip respectively disposed at a pair of corners on the top of the bracket; two of the first LED chips and one of the second LED chips are connected in series to the first positive electrode through gold wire bonding technology, and the other two first LED chips and the other one of the second LED chips are connected in series to the first negative electrode, and the two second LED chips are connected in series;

[0009] The working light source group includes: one third LED chip, one fourth LED chip, one fifth LED chip, one sixth LED chip, one seventh LED chip, and one eighth LED chip. The third LED chip, the fourth LED chip, the fifth LED chip, and the sixth LED chip, the seventh LED chip, and the eighth LED chip are respectively arranged at the other pair of corners on the top of the bracket; the third LED chip, the fourth LED chip, and the fifth LED chip are connected in series to the second positive electrode through gold wire bonding technology, the sixth LED chip, the seventh LED chip, and the eighth LED chip are connected in series to the second negative electrode, and the fifth LED chip and the sixth LED chip are connected in series;

[0010] The resting light source group meets the following requirements: Ra>83 (R9>40), Rg>100, Rf>82, an S / P ratio of 87% of sunlight with the same color temperature, an M / P ratio of 82% of sunlight with the same color temperature, a color temperature of 3800-4200K, chromaticity coordinates meeting the 4-step color tolerance chromaticity standard, and an SSI coefficient of similarity to sunlight spectrum>68%.

[0011] The working light source group meets the following requirements: Ra>97 (R1-R15>95), Rg>100, Rf>95, S / P ratio and M / P ratio are equal to sunlight with the same color temperature, the color temperature meets the requirement of 3800-4200K, the chromaticity coordinates meet the 4-step color tolerance chromaticity standard, and the SSI coefficient of similarity with the sunlight spectrum is>92%.

[0012] Optionally, PIN pins are respectively provided at the four corners of the bottom of the bracket, and the area of ​​each PIN pin accounts for 3%-5% of the area of ​​the bottom of the bracket; the two PIN pins at one pair of diagonal corners form a pair of positive and negative poles, and the two PIN pins at the other pair of corners form another pair of positive and negative poles.

[0013] Optionally, the fluorescent glue is prepared in a mass ratio of glue: blue powder with an emission wavelength of 490-505nm: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm = 3: (0.12-0.14): (1.3-1.8): (0.04-0.08): (1.0-1.4), so that the light color meets the requirement of the color parameter 4000K.

[0014] Optionally, the blue powder is Lu3Al5O12:Ce 3+ The component has a peak wavelength of 500nm and a half-wave width of 80-90nm;

[0015] The green powder is Lu3Al5O12:Ce 3+ The component has a peak wavelength of 530nm and a half-wave width of 90-105nm;

[0016] The red powder is composed of CaAlSiN3:Eu, with a peak wavelength of 635nm and a half-wave width of 65-75nm;

[0017] The infrared powder is Ga4GeO8:Cr 3+ The peak wavelength is 730nm and the half-wave width is 120-130nm.

[0018] Optionally, the rhythm factor adjustable LED structure satisfies the spectral energy proportion of the packaged finished product:

[0019] The resting state light source group is: φe (350-399 nm): φe (400-499 nm): φe (500-599 nm): φe (600-699 nm): φe (700-1000 nm) = (0.0%-0.2%): (17.0%-17.5%): (33%-34%): (29%-29.5%): (19.7%-20.3%);

[0020] The working light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = (2.0%-2.5%): (17.0%-17.5%): (26.0%-26.5%): (28.3%-28.8%): (25.2%-25.7%).

[0021] Optionally, the rhythm factor adjustable LED structure satisfies the relative spectral height of the packaged finished product:

[0022] The resting state light source group is: 680-730nm≥0.4, peak wavelength is 430-450nm;

[0023] The working light source group is: 350-480nm≤0.75, 680-730nm≥0.8, and the peak wavelength is 600-650nm.

[0024] An embodiment of the present invention further provides a packaging method for an LED structure with adjustable rhythmic factor, which comprises the following steps:

[0025] S100: Each LED chip is fixed on the top of the bracket using an insulating glue or silver glue using a die bonder. After the die bond is completed, it is baked in an oven at 150-160° C. for 2 hours ± 10 minutes to ensure that each LED chip is completely fixed on the top of the bracket;

[0026] S200: After the LED chips are bonded, the LED chips are connected to each other and to the positive and negative electrodes of the corresponding brackets by gold wire bonding technology;

[0027] S300: preparing a fluorescent glue solution, wherein the fluorescent glue solution is prepared by mixing glue, blue powder with an emission wavelength of 490-505 nm, green powder with an emission wavelength of 530-540 nm, red powder with an emission wavelength of 630-640 nm, and infrared powder with an emission wavelength of 725-735 nm according to a mass ratio, and ensuring that the light color of the fluorescent glue solution meets the color parameter of 4000K;

[0028] S400: Pour the prepared fluorescent glue solution into the glue barrel of the glue dispensing machine. After the glue and bubbles are removed, dispense the fluorescent glue solution into the bowl. After dispensing, bake it in two stages: 80℃ / 0.5h+160℃ / 4h.

[0029] S500: After the LED package structure product has been glued and baked, it is degranulated and then spectroscopically tested according to the given color parameters using a spectrophotometer;

[0030] S600: Control the chromaticity width of LED package structure products within the 4-step MacAdam ellipse.

[0031] The above one or more technical solutions in the cadence factor adjustable LED structure and packaging method thereof provided by the embodiments of the present invention have at least one of the following technical effects:

[0032] 1. The S / P ratio and M / P ratio parameters of the working light source group are the same as the spectrum of sunlight with the same color temperature, which makes people feel comfortable, have clear vision, and have a soft and beautiful visual experience. The high M / P ratio parameter can inhibit the secretion of melatonin, making people excited and working more relaxed and enjoyable. The high S / P ratio parameter also provides a clearer field of vision, higher effective visual efficiency, and clearer vision.

[0033] 2. The SSI (350-830nm) of the working light source group is >92, an excellent spectral similarity parameter, which restores the color of natural light, allowing people to experience nature and enjoy the sun bathing;

[0034] 3. The relative spectral energy of the 680-720nm working light source group is greater than 0.8, which can effectively adjust the human eye axis and inhibit the formation of human eye secretions, thereby achieving the effect of eye protection;

[0035] 4. The low M / P ratio parameter of the resting light source group promotes melatonin secretion, making it easier for people to fall asleep;

[0036] 5. The cadence factor adjustable LED structure provided in the embodiment of the present invention satisfies the requirements of different application scenarios and achieves dynamic lighting design requirements by integrating the resting state and working state light sources into one design. The spectrum of the light source can be adjusted by adjusting different current inputs. The cadence factor M / P ratio parameter is variable, and the Ra (color rendering index) is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] FIG1 is a schematic diagram of a rhythm factor adjustable LED structure provided by an embodiment of the present invention.

[0039] FIG2 is a cross-sectional view of a LED structure with adjustable rhythmic factors provided by an embodiment of the present invention.

[0040] FIG3 is a diagram showing the bonding wire connections of the LED structure with adjustable rhythmic factor provided by an embodiment of the present invention.

[0041] FIG4 is a schematic diagram of the front and back of a rhythm factor adjustable LED structure provided by an embodiment of the present invention.

[0042] FIG5 is a graph showing the luminous spectrum of the finished product LED in working state of the LED structure with adjustable rhythmic factor provided by an embodiment of the present invention.

[0043] FIG6 is a graph showing the similarity calculation between the finished working LED of the circadian factor adjustable LED structure provided by an embodiment of the present invention and the 4000K sunlight SSI spectrum.

[0044] FIG7 is a test report of a finished working LED having an LED structure with adjustable rhythmic factor provided by an embodiment of the present invention.

[0045] FIG8 is a diagram showing the chromaticity landing point bin requirements of a finished product of a rhythm factor adjustable LED structure provided by an embodiment of the present invention.

[0046] FIG9 is a graph showing the luminous spectrum of a resting-state LED of a finished product of an LED structure with adjustable rhythmic factors provided by an embodiment of the present invention.

[0047] FIG10 is a graph showing the similarity calculation between the resting-state LED of the finished product with the circadian factor adjustable LED structure provided by an embodiment of the present invention and the 4000K sunlight SSI spectrum.

[0048] FIG11 is a test report of a resting-state LED having a rhythm factor adjustable LED structure provided by an embodiment of the present invention.

[0049] FIG12 is a spectrum curve diagram of the rest state and working state light sources of the rhythm factor adjustable LED structure provided by an embodiment of the present invention when different currents are passed through them.

[0050] Among them, the figure marks are: 1—first positive pole 2—second positive pole 3—first negative pole 4—second negative pole 5—first LED chip 6—second LED chip 7—third LED chip 8—fourth LED chip 9—fifth LED chip 10—sixth LED chip 11—seventh LED chip 12—eighth LED chip 13—functional area 16—bowl 17—bracket 18—fluorescent glue A—positive electrode welding foot B—positive electrode welding foot C—negative electrode welding foot D—negative electrode welding foot E—heat dissipation welding foot. DETAILED DESCRIPTION

[0051] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 Figures 1-12 are exemplary and are intended to explain the embodiments of the present invention, and are not to be construed as limiting the present invention.

[0052] In one embodiment of the present invention, as shown in Figures 1 and 2, a rhythm factor adjustable LED structure is provided, comprising a bracket 17, a bowl, fluorescent glue 18, and a plurality of LED chips, wherein the bracket 17 has four corners. It should be noted that the bracket 17 having four corners does not limit the bracket 17 to a square structure. Rather, the bracket 17 provided in this embodiment is configured to have four corners. Even if the bracket 17 is circular, it can be virtually defined as having four corners. These four corners are used for the layout of related components, such as LED chips, electrodes, and / or PIN pins.

[0053] As shown in Figures 1-2 and 4, bracket 17 is equipped with a first cathode 3, a second cathode 4, a first anode 1, and a second anode 2 at its four corners. The first cathode 3 is positioned diagonally opposite the first anode 1, and the second cathode 4 is positioned diagonally opposite the second anode 2. A cup is positioned at the top periphery of bracket 17. Each LED chip is encapsulated with fluorescent adhesive 18 on the top of bracket 17 and positioned within the cup. The central area of ​​bracket 17, where the LED chips are mounted, is the functional area 13.

[0054] Multiple LED chips include a first LED chip 5 with a main wavelength of 440-445nm, a second LED chip 6 with a peak wavelength of 425-430nm, a third LED chip 7 with a peak wavelength of 365-370nm, a fourth LED chip 8 with a peak wavelength of 405-410nm, a fifth LED chip 9 with a main wavelength of 442-447nm, a sixth LED chip 10 with a main wavelength of 450-455nm, a seventh LED chip 11 with a main wavelength of 460-465nm and an eighth LED chip 12 with a peak wavelength of 380-385nm. The position layout of each LED chip is set to include a resting state light source group and a working state light source group.

[0055] That is, the present invention forms a resting state light source group and a working state light source group through the reasonable layout of a specific first LED chip 5, a second LED chip 6, a third LED chip 7, a fourth LED chip 8, a fifth LED chip 9, a sixth LED chip 10, a seventh LED chip 11 and an eighth LED chip 12. Some LED chips constitute the resting state light source group, and the remaining LED chips constitute the working state light source group.

[0056] The parameters of each LED chip are shown in the following table:

[0057] Furthermore, the resting-state light source group includes four first LED chips 5 and two second LED chips 6. Two first LED chips 5 and one second LED chip 6 are positioned at a pair of corners at the top of the bracket 17. As shown in FIG3 , two of the first LED chips 5 and one of the second LED chips 6 are connected in series to the first anode 1 using gold wire bonding technology. Another two first LED chips 5 and another second LED chip 6 are connected in series to the first cathode 3, and the two second LED chips 6 are connected in series. This forms a resting-state light source group at the lower left and upper right corners of the LED structure in FIG3 .

[0058] Furthermore, the operating light source group includes: a third LED chip 7, a fourth LED chip 8, a fifth LED chip 9, a sixth LED chip 10, a seventh LED chip 11, and an eighth LED chip 12. A third LED chip 7, a fourth LED chip 8, a fifth LED chip 9, and a sixth LED chip 10, a seventh LED chip 11, and an eighth LED chip 12 are respectively disposed at the other pair of corners at the top of the bracket 17. As shown in FIG3 , the third LED chip 7, the fourth LED chip 8, and the fifth LED chip 9 are connected in series to the second anode 2, the sixth LED chip 10, the seventh LED chip 11, and the eighth LED chip 12 are connected in series to the second cathode 4, and the fifth LED chip 9 and the sixth LED chip 10 are connected in series. Thus, an operating light source group is formed at the lower right and upper left corners of the LED structure in FIG3 .

[0059] The design and layout of the aforementioned LED chips achieves the following: a resting light source group meeting the following criteria: Ra > 83 (R9 > 40), Rg > 100, Rf > 82, an S / P ratio of 87% and an M / P ratio of 82% of sunlight at the same color temperature; a color temperature of 3800-4200K; chromaticity coordinates meeting the four-step color tolerance standard; and an SSI coefficient of spectral similarity with sunlight of > 68%. Furthermore, a working light source group meets the following criteria: Ra > 97 (R1-R15 > 95), Rg > 100, Rf > 95, an S / P ratio and M / P ratio equivalent to sunlight at the same color temperature; a color temperature of 3800-4200K; chromaticity coordinates meeting the four-step color tolerance standard; and an SSI coefficient of spectral similarity with sunlight of > 92%.

[0060] Combined with the chromaticity landing point bin diagram requirement indicators of the finished product of the rhythm factor adjustable LED structure provided by the embodiment of the present invention in Figure 8; the luminous spectrum curve diagram of the finished product of the rhythm factor adjustable LED structure provided by the embodiment of the present invention in Figure 9; the similarity calculation diagram of the finished product of the rhythm factor adjustable LED structure in the resting state and the 4000K sunlight SSI spectrum provided by the embodiment of the present invention in Figure 10; the test report of the resting state LED of the rhythm factor adjustable LED structure provided by the embodiment of the present invention in Figure 11; the spectrum curve diagram of the resting state and working state light sources of the rhythm factor adjustable LED structure provided by the embodiment of the present invention through different currents in Figure 12. It can be seen that the rhythm factor adjustable LED structure provided by the embodiment of the present invention has at least the following technical effects:

[0061] 1. The S / P ratio and M / P ratio parameters of the working light source group are the same as the spectrum of sunlight with the same color temperature, which makes people feel comfortable, have clear vision, and have a soft and beautiful visual experience. The high M / P ratio parameter can inhibit the secretion of melatonin, making people excited and working more relaxed and enjoyable. The high S / P ratio parameter also provides a clearer field of vision, higher effective visual efficiency, and clearer vision.

[0062] 2. The SSI (350-830nm) of the working light source group is >92, an excellent spectral similarity parameter, which restores the color of natural light, allowing people to experience nature and enjoy the sun bathing;

[0063] 3. The relative spectral energy of the 680-720nm working light source group is greater than 0.8, which can effectively adjust the human eye axis and inhibit the formation of human eye secretions, thereby achieving the effect of eye protection;

[0064] 4. The low M / P ratio parameter of the resting light source group promotes melatonin secretion, making it easier for people to fall asleep;

[0065] 5. The cadence factor adjustable LED structure provided in the embodiment of the present invention satisfies the requirements of different application scenarios and achieves dynamic lighting design requirements by integrating the resting state and working state light sources into one design. The spectrum of the light source can be adjusted by adjusting different current inputs. The cadence factor M / P ratio parameter is variable, and the Ra (color rendering index) is adjustable.

[0066] For example, Figure 5 is the spectral distribution of the working LED of the rhythmic factor adjustable LED structure according to an embodiment of the present invention; Figure 6 is a calculation diagram of the similarity between the finished working LED of the rhythmic factor adjustable LED structure provided by an embodiment of the present invention and the 4000K sunlight SSI spectrum; Figure 7 is a test report of the finished working LED of the rhythmic factor adjustable LED structure provided by an embodiment of the present invention.

[0067] Among them, the following table is a spectral distribution table of the finished working state LED light emission spectrum and the solar spectrum of the rhythm factor adjustable LED structure provided by the embodiment of the present invention.

[0068] The following table is a comparison table of the S / P ratio and M / P ratio of the finished working LED of the cadence factor adjustable LED structure provided by the embodiment of the present invention and the sunlight 4000K.

[0069] The following table is a spectral distribution table of the resting-state LED emission spectrum and the solar spectrum of the finished product of the rhythmic factor adjustable LED structure provided by the embodiment of the present invention.

[0070] The following table is a comparison table of the S / P ratio and M / P ratio of the resting state LED of the product with adjustable rhythm factor LED structure provided by the embodiment of the present invention and sunlight 4000K.

[0071] The following table is a photoelectric parameter test data table of the rest state and working state light source of the rhythm factor adjustable LED structure provided by an embodiment of the present invention through 11 groups of different currents, including sub-table 1, sub-table 2 and sub-table 3 respectively.

[0072] Table 1

[0073] Table 2

[0074] Table 3

[0075] In this embodiment, as shown in Figures 1 and 4 , PIN pins are provided at the four corners of the bottom of the bracket 17. The four PIN pins are the positive electrode solder pin A, positive electrode solder pin B, negative electrode solder pin C, and negative electrode solder pin E on the bottom (i.e., back) of the bracket 17 in Figure 4 . The central area formed by the positive electrode solder pins A, positive electrode solder pin B, negative electrode solder pin C, and negative electrode solder pin D is the heat dissipation solder pin E. The area of ​​each PIN pin accounts for 3%-5% of the area of ​​the bottom of the bracket 17; the two PIN pins at a pair of diagonal corners form a pair of positive and negative electrodes (i.e., first positive electrode 1 and first negative electrode 3), and the two PIN pins at another pair of corners form another pair of positive and negative electrodes (i.e., second positive electrode 2 and second negative electrode 4).

[0076] Specifically, the first cathode 3 , the second cathode 4 , the first anode 1 , and the second anode 2 are respectively connected to one of the PIN pins.

[0077] In this embodiment, the fluorescent glue 18 is prepared in a mass ratio of 3:0.14:1.8:0.08:1.4 of glue: blue powder with an emission wavelength of 490-505nm: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm, so that the light color meets the requirement of the color parameter 4000K.

[0078] In this embodiment, the blue powder is Lu3Al5O12:Ce 3+ The composition has a peak wavelength of 500nm and a half-wave width of 80-90nm; the green powder is Lu3Al5O12:Ce 3+ The red powder is composed of CaAlSiN3:Eu, with a peak wavelength of 635nm and a half-wave width of 65-75nm; the infrared powder is composed of Ga4GeO8:Cr 3+The peak wavelength is 730 nm and the half-wave width is 120-130 nm. In this embodiment, the M / P ratio and the S / P ratio are increased, and the composite infrared phosphor effect increases the Ra color rendering index.

[0079] In this embodiment, the LED structure with adjustable rhythm factor satisfies the spectral energy proportion of the packaged finished product:

[0080] The resting state light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = 0.2%: 17.5%: 34%: 29.5%: 20.3%;

[0081] Furthermore, the working light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = 2.5%: 17.5%: 26.5%: 28.8%: 25.7%.

[0082] In this embodiment, further, the rhythm factor adjustable LED structure satisfies the relative spectral height of the packaged finished product: the resting state light source group is: 680-730nm≥0.4, the peak wavelength is 430-450nm; the working state light source group is: 350-480nm≤0.75, 680-730nm≥0.8, and the peak wavelength is 600-650nm.

[0083] Furthermore, in the rhythm factor adjustable LED structure of the embodiment of the present invention, the two first LED chips 5 and the second LED chip 6 connected in series with the first positive pole 1 are symmetrical with the third LED chip 7, the fourth LED chip 8, and the fifth LED chip 9 connected in series with the second positive pole 2; and the two first LED chips 5 and the second LED chip 6 connected in series with the first negative pole 3 are symmetrical with the sixth LED chip 10, the seventh LED chip 11, and the eighth LED chip 12 connected in series with the second negative pole 4.

[0084] Furthermore, the two first LED chips 5, the second LED chip 6 connected in series with the first positive pole 1, and the sixth LED chip 10, the seventh LED chip 11 and the eighth LED chip 12 connected in series with the second negative pole 4 are symmetrical with the third LED chip 7, the fourth LED chip 8 and the fifth LED chip 9 connected in series with the second positive pole 2, and the two first LED chips 5 and the second LED chip 6 connected in series with the first negative pole 3 are symmetrical.

[0085] Example 2.

[0086] The difference between this embodiment and the above-mentioned embodiment 1 is that the fluorescent glue 18 is prepared in a mass ratio of glue: blue powder with an emission wavelength of 490-505nm: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm = 3:0.12:1.3:0.04:1.0, so that the light color meets the requirement of the color parameter 4000K.

[0087] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0088] Example 3.

[0089] The difference between this embodiment and the above-mentioned embodiment 1 is that the fluorescent glue 18 is prepared in a mass ratio of glue: blue powder with an emission wavelength of 490-505nm: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm = 3:0.13:1.5:0.06:1.2, so that the light color meets the requirement of the color parameter 4000K.

[0090] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0091] Example 4.

[0092] The difference between this embodiment and the above-mentioned embodiment 1 is that the resting state light source group is: φe (350-399nm): φe (400-499nm): φe (500-599nm): φe (600-699nm): φe (700-1000nm) = 0.1%: 17.0%: 33%: 29%: 19.7%;

[0093] Furthermore, the working light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = 2.0%: 17.0%: 26.0%: 28.3%: 25.2%.

[0094] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0095] Example 5.

[0096] The difference between this embodiment and the above-mentioned embodiment 1 is that the resting state light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = 0.15%: 17.3%: 33.5%: 29.3%: 20%.

[0097] Furthermore, the working light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = 2.3%: 17.2%: 26.2%: 28.5%: 25.5%.

[0098] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0099] Example 6.

[0100] An embodiment of the present invention further provides a packaging method for an LED structure with adjustable rhythmic factor, which comprises the following steps:

[0101] S100: Each LED chip is fixed to the top of the bracket 17 using an insulating glue or silver glue using a die bonder. After the die bond is completed, the LED chip is baked in an oven at 150-160°C for 2 hours ± 10 minutes to ensure that each LED chip is completely fixed to the top of the bracket 17. For example, after the die bond is completed, the LED chip is baked in an oven at 150°C for 2 hours, or in an oven at 160°C for 1 hour and 50 minutes, or in an oven at 155°C for 2 hours and 10 minutes. The steps can be performed within the parameter range according to the actual situation.

[0102] S200: After the LED chips are bonded, the positive and negative electrodes of the LED chips and the corresponding brackets 17 are connected by gold wire bonding technology; specifically, see the figure for the connection of the first LED chip 5, the second LED chip 6, the third LED chip 7, the fourth LED chip 8, the fifth LED chip 9, the sixth LED chip 10, the seventh LED chip 11, the eighth LED chip 12, and the first positive electrode 1, the second positive electrode 2, the first negative electrode 3, and the second negative electrode 4;

[0103] S300: Prepare fluorescent glue solution, which is composed of glue, blue powder with an emission wavelength of 490-505nm, green powder with an emission wavelength of 530-540nm, red powder with an emission wavelength of 630-640nm, and infrared powder with an emission wavelength of 725-735nm, and is mixed in a mass ratio, and ensure that the light color of the fluorescent glue solution meets the color parameter of 4000K; Specifically, the fluorescent glue 18 is: glue: emission wavelength 490 - The mass ratio of 505nm blue powder: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm is 3:0.14:1.8:0.08:1.4 or 3:0.12:1.3:0.04:1.0 or 3:0.13:1.5:0.06:1.2, so that the light color meets the requirements of the color parameter 4000K;

[0104] S400: Pour the prepared fluorescent glue solution into the glue barrel of the glue dispensing machine. After the glue and bubbles are removed, the fluorescent glue solution is dispensed into the bowl cup 16. After dispensing, it is baked in two stages: 80℃ / 0.5h+160℃ / 4h. In this step, the first stage of baking is baking at 80℃ for 0.5h, and the second stage of baking is baking at 160℃ for 4h.

[0105] S500: After the LED package structure product has been glued and baked, it is degranulated and then spectroscopically tested according to the given color parameters using a spectrophotometer;

[0106] The following table shows the spectral parameters of the finished product of the LED structure with adjustable rhythmic factor formed by the packaging method of this embodiment.

[0107] S600: Control the chromaticity width of LED package structure products within the 4-step MacAdam ellipse.

[0108] The LED structure with adjustable rhythmic factor produced by the packaging method provided in the embodiment of the present invention has at least the following technical effects:

[0109] 1. The S / P ratio and M / P ratio parameters of the working light source group are the same as the spectrum of sunlight with the same color temperature, which makes people feel comfortable, have clear vision, and have a soft and beautiful visual experience. The high M / P ratio parameter can inhibit the secretion of melatonin, making people excited and working more relaxed and enjoyable. The high S / P ratio parameter also provides a clearer field of vision, higher effective visual efficiency, and clearer vision.

[0110] 2. The SSI (350-830nm) of the working light source group is >92, an excellent spectral similarity parameter, which restores the color of natural light, allowing people to experience nature and enjoy the sun bathing;

[0111] 3. The relative spectral energy of the 680-720nm working light source group is greater than 0.8, which can effectively adjust the human eye axis and inhibit the formation of human eye secretions, thereby achieving the effect of eye protection;

[0112] 4. The low M / P ratio parameter of the resting light source group promotes melatonin secretion, making it easier for people to fall asleep;

[0113] 5. The cadence factor adjustable LED structure provided in the embodiment of the present invention satisfies the requirements of different application scenarios and achieves dynamic lighting design requirements by integrating the resting state and working state light sources into one design. The spectrum of the light source can be adjusted by adjusting different current inputs. The cadence factor M / P ratio parameter is variable, and the Ra (color rendering index) is adjustable.

[0114] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rhythm factor adjustable LED structure, comprising a bracket, a bowl, fluorescent glue, and multiple LED chips. The bracket has four corners, each of which is provided with a first cathode, a second cathode, a first anode, and a second anode. The first cathode is disposed diagonally opposite the first anode, and the second cathode is disposed diagonally opposite the second anode. The bowl is disposed on the periphery of the top of the bracket, and each LED chip is encapsulated with the fluorescent glue on the top of the bracket and located within the bowl. Characteristic: The plurality of LED chips include a first LED chip with a dominant wavelength of 440-445 nm, a second LED chip with a peak wavelength of 425-430 nm, a third LED chip with a peak wavelength of 365-370 nm, a fourth LED chip with a peak wavelength of 405-410 nm, a fifth LED chip with a dominant wavelength of 442-447 nm, a sixth LED chip with a dominant wavelength of 450-455 nm, a seventh LED chip with a dominant wavelength of 460-465 nm, and an eighth LED chip with a peak wavelength of 380-385 nm. The position layout of each of the LED chips is set to include a resting state light source group and an operating state light source group. The resting-state light source group includes: four first LED chips and two second LED chips, with two first LED chips and one second LED chip respectively disposed at a pair of corners on the top of the bracket; two of the first LED chips and one of the second LED chips are connected in series to the first positive electrode through gold wire bonding technology, and the other two first LED chips and the other one of the second LED chips are connected in series to the first negative electrode, and the two second LED chips are connected in series; The working light source group includes: one third LED chip, one fourth LED chip, one fifth LED chip, one sixth LED chip, one seventh LED chip, and one eighth LED chip. The third LED chip, the fourth LED chip, the fifth LED chip, and the sixth LED chip, the seventh LED chip, and the eighth LED chip are respectively arranged at the other pair of corners on the top of the bracket; the third LED chip, the fourth LED chip, and the fifth LED chip are connected in series to the second positive electrode through gold wire bonding technology, the sixth LED chip, the seventh LED chip, and the eighth LED chip are connected in series to the second negative electrode, and the fifth LED chip and the sixth LED chip are connected in series; The resting light source group meets the following requirements: Ra>83, R9>40, Rg>100, Rf>82, an S / P ratio of 87% of sunlight with the same color temperature, an M / P ratio of 82% of sunlight with the same color temperature, a color temperature of 3800-4200K, chromaticity coordinates meeting the 4-step color tolerance chromaticity standard, and an SSI coefficient of similarity to the sunlight spectrum of >68%. The working light source group meets the following requirements: Ra>97, (R1-R15)>95, Rg>100, Rf>95, S / P ratio and M / P ratio are equal to sunlight with the same color temperature, the color temperature meets the requirement of 3800-4200K, the chromaticity coordinates meet the 4-step color tolerance chromaticity standard, and the SSI coefficient of similarity with the sunlight spectrum is>92%.

2. The rhythm factor adjustable LED structure according to claim 1, characterized in that: There are PIN pins at the four corners of the bottom of the bracket, and the area of ​​each PIN pin accounts for 3%-5% of the area of ​​the bottom of the bracket; the two PIN pins at one pair of diagonal corners form a pair of positive and negative poles, and the two PIN pins at the other pair of corners form another pair of positive and negative poles.

3. The LED structure with adjustable rhythmic factor according to claim 1, characterized in that: The fluorescent glue is prepared in a mass ratio of 3: (0.12-0.14): (1.3-1.8): (0.04-0.08): (1.0-1.4) of glue: blue powder with an emission wavelength of 490-505nm: green powder with an emission wavelength of 530-540nm: red powder with an emission wavelength of 630-640nm: infrared powder with an emission wavelength of 725-735nm, so that the light color meets the requirement of the color parameter 4000K.

4. The rhythm factor adjustable LED structure according to claim 3, characterized in that: The blue powder is Lu3Al5O12:Ce 3+ The component has a peak wavelength of 500nm and a half-wave width of 80-90nm; The green powder is Lu3Al5O12:Ce 3+ The component has a peak wavelength of 530nm and a half-wave width of 90-105nm; The red powder is composed of CaAlSiN3:Eu, with a peak wavelength of 635nm and a half-wave width of 65-75nm; The infrared powder is Ga4GeO8:Cr 3+ The peak wavelength is 730nm and the half-wave width is 120-130nm.

5. The rhythm factor adjustable LED structure according to claim 1, characterized in that: The LED structure with adjustable rhythm factor satisfies the spectral energy proportion of the packaged finished product: The resting state light source group is: φe (350-399 nm): φe (400-499 nm): φe (500-599 nm): φe (600-699 nm): φe (700-1000 nm) = (0.0%-0.2%): (17.0%-17.5%): (33%-34%): (29%-29.5%): (19.7%-20.3%); The working light source group is: Фe (350-399nm): Фe (400-499nm): Фe (500-599nm): Фe (600-699nm): Фe (700-1000nm) = (2.0%-2.5%): (17.0%-17.5%): (26.0%-26.5%): (28.3%-28.8%): (25.2%-25.7%).

6. The LED structure with adjustable rhythmic factor according to claim 1, characterized in that: The LED structure with adjustable rhythmic factor satisfies the relative spectral height of the packaged finished product: The resting state light source group is: 680-730nm≥0.4, peak wavelength is 430-450nm; The working light source group is: 350-480nm≤0.75, 680-730nm≥0.8, and the peak wavelength is 600-650nm.

7. A method for packaging the LED structure with adjustable rhythmicity factor according to any one of claims 1 to 6, characterized in that: The following steps are involved: S100: Each LED chip is fixed on the top of the bracket using an insulating glue or silver glue using a die bonder. After the die bond is completed, it is baked in an oven at 150-160° C. for 2 hours ± 10 minutes to ensure that each LED chip is completely fixed on the top of the bracket; S200: After the LED chips are bonded, the LED chips are connected to each other and to the positive and negative electrodes of the corresponding brackets by gold wire bonding technology; S300: preparing a fluorescent glue solution, wherein the fluorescent glue solution is prepared by mixing glue, blue powder with an emission wavelength of 490-505 nm, green powder with an emission wavelength of 530-540 nm, red powder with an emission wavelength of 630-640 nm, and infrared powder with an emission wavelength of 725-735 nm according to a mass ratio, and ensuring that the light color of the fluorescent glue solution meets the color parameter of 4000K; S400: Pour the prepared fluorescent glue solution into the glue barrel of the glue dispensing machine. After the glue and bubbles are removed, dispense the fluorescent glue solution into the bowl. After dispensing, bake it in two stages: 80℃ / 0.5h+160℃ / 4h. S500: After the LED package structure product has been glued and baked, it is degranulated and then spectroscopically tested according to the given color parameters using a spectrophotometer; S600: Control the chromaticity width of LED package structure products within the 4-step MacAdam ellipse.

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