White FCOB lamp strip and precise dotting and coating method thereof

Abstract

The invention provides a white FCOB lamp strip and a precise dotting and coating method thereof. The white FCOB lamp strip comprises a substrate, a plurality of flip blue light chips, a plurality of fluorescent glue and milky white glue. The plurality of flip blue light chips are arranged on the substrate, the plurality of fluorescent glues are respectively coated on the surfaces of the plurality of flip blue light chips, and the plurality of fluorescent glues are sealed in the milky white glue. The method has the following effects that the coating precision of the fluorescent glue can be ensured through the precise dotting technology, and the outer layer is provided with the diffusible milky white glue, so that the illumination output of each white FCOB lamp strip is more uniform; the light emitting source is protected by the double-layer colloid, so that the lamp strip is ensured not to be dead or short-circuited after being used for a long time; and the overall appearance of the lamp strip is changed from conventional yellow to milk white which is close to the color of an FPC substrate, so that the lamp strip is more friendly to international customer groups.

Description

Technical Field

[0001] The present invention relates to the technical field of decorative lighting, and particularly to a white FCOB light strip and a precise dot coating method thereof. Background Art

[0002] Existing FCOB (Full Chip On Board) light strips are widely used, especially in lighting scenarios that require high brightness and uniform light sources. However, since the surface of the FCOB chip is coated with fluorescent glue, the appearance is yellow. Some international customers consider yellow to be an "aggressive" color, and the method is not precise enough, often resulting in problems such as uneven light emission, unstable light efficiency, or inconsistent color temperature. These problems seriously affect the overall lighting effect among some international customer groups, in cabinet lighting applications, especially in the fields of display lighting and art lighting. Therefore, it is of great significance to develop a precise dot coating method with a white appearance to improve these problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a white FCOB light strip and a precise dot coating method thereof, which are used to solve the problems that the existing FCOB light strip has a yellow appearance due to the surface coating of fluorescent glue, and uneven light emission, unstable light efficiency, or inconsistent color temperature.

[0004] On the one hand, the present invention provides a white FCOB light strip, including a substrate, a plurality of flip-chip blue light chips, a plurality of fluorescent glues, and an opal glue;

[0005] The plurality of flip-chip blue light chips are arranged on the substrate, the plurality of fluorescent glues are respectively coated on the surfaces of the plurality of flip-chip blue light chips, and the plurality of fluorescent glues are sealed in the opal glue.

[0006] The opal glue is fixed on the substrate.

[0007] The opal glue includes transparent silicone, silicone-modified epoxy resin, and a diffusing agent, and the weight ratio of the silicone, silicone-modified epoxy resin, and diffusing agent is (1 - 1.5):(75 - 100):(0.1 - 0.3).

[0008] The thickness range of the fluorescent glue is 0.4 - 0.5 mm.

[0009] The fluorescent glue includes green fluorescent powder, red fluorescent powder, and far-red fluorescent powder. The range of the peak wavelength of the green fluorescent powder is 511.5 - 513.5 nm, the range of the wavelength of the red fluorescent powder is 651.5 - 653.5 nm, the range of the wavelength of the far-red fluorescent powder is 711.5 - 748.5 nm, and the weight ratio of the green fluorescent powder, red fluorescent powder, and far-red fluorescent powder is 1:(0.11 - 0.24):(0.06 - 0.14).

[0010] On the one hand, a precise dotting and coating method for a white FCOB light strip is provided, which is used for precisely dotting and coating fluorescent glue on the white FCOB light strip as described above. The precise dotting and coating method includes:

[0011] Setting a plurality of flip-chip blue light chips on a substrate;

[0012] Obtaining the position information of each flip-chip blue light chip;

[0013] Controlling a plurality of fluorescent glues to be respectively coated on the plurality of flip-chip blue light chips according to the position information of the flip-chip blue light chips;

[0014] Sealing the plurality of fluorescent glues in the milky white glue.

[0015] It further includes:

[0016] Mixing silicone, silicone-modified epoxy resin and a dispersant according to a weight ratio of (1 - 1.5):(75 - 100):(0.1 - 0.3) to generate the milky white glue;

[0017] Mixing green fluorescent powder, red fluorescent powder and far-red fluorescent powder according to a weight ratio of 1:(0.11 - 0.24):(0.06 - 0.14) to generate the fluorescent glue.

[0018] The obtaining of the position information of each flip-chip blue light chip includes:

[0019] Establishing a rectangular coordinate system with the plane where the substrate is located;

[0020] Obtaining the coordinates of each flip-chip blue light chip in the rectangular coordinate system.

[0021] The controlling of a plurality of fluorescent glues to be respectively coated on the plurality of flip-chip blue light chips according to the position information of the flip-chip blue light chips includes:

[0022] Determining the coating position of the fluorescent glue according to the position information of the flip-chip blue light chips;

[0023] Controlling the coating amount of the fluorescent glue on each flip-chip blue light chip by the valve body flow rate and the screw rod rotation time of a preset dispensing system;

[0024] Controlling the thickness of the coated fluorescent glue by the glue output amount and the pressure of the preset dispensing system.

[0025] The sealing of the plurality of fluorescent glues in the milky white glue includes:

[0026] Fixing the milky white glue on the substrate to form an accommodating space;

[0027] Sealing the plurality of fluorescent glues in the accommodating space.

[0028] As described above, a white FCOB light strip and its precise dot coating method of the present invention have the following beneficial effects:

[0029] The precise dot technology can ensure the coating accuracy of the fluorescent glue and the milky white glue with diffusion property on the outer layer, making the light output of each white FCOB light strip more uniform; the protection of the light-emitting source by the double-layer colloid ensures that the light strip does not have dead lights or short circuits during long-term use; the overall appearance of the light strip is changed from the conventional yellow to milky white, which is close to the color of the FPC substrate and is more friendly to the international customer group. Brief Description of the Drawings

[0030] Figure 1 It is an exploded view of the structure of a white FCOB light strip provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of a white FCOB light strip provided by an embodiment of the present invention. Detailed Embodiments

[0032] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0033] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0034] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0035] As Figure 1 and Figure 2 shown, Figure 1 is a schematic structural diagram of a white FCOB light strip provided by an embodiment of the present invention. Figure 2 is a schematic structural diagram of a white FCOB light strip provided by an embodiment of the present invention. The white FCOB light strip includes a substrate 1, a plurality of flip-chip blue light chips 2, a plurality of fluorescent gels 3, and an opal gel 4; the plurality of flip-chip blue light chips 2 are arranged on the substrate 1, the plurality of fluorescent gels 3 are respectively coated on the surfaces of the plurality of flip-chip blue light chips 2, and the plurality of fluorescent gels 3 are sealed in the opal gel 4. The opal gel 4 is fixed on the substrate 1.

[0036] In this embodiment, the white FCOB light strip is composed of a plurality of FCOB flip-chip blue light chips 2, and a fluorescent gel 3 is evenly coated on each FCOB chip. The coating of the fluorescent gel 3 is carried out by a precision dotting technique to ensure that the light intensity of each FCOB flip-chip blue light chip 2 is consistent and the color temperature is stable. Refer to Figure 1 - Figure 2 , the bottom of the opal gel 4 is fixedly connected to the substrate 1. After the fluorescent gel 3 encapsulates the flip-chip blue light chip 2, it is sealed in the opal gel 4. There is an accommodation space for the fluorescent gel 3 and the flip-chip blue light chip 2 between the opal gel 4 and the substrate 1. The substrate 1 is preferably an FPC (Flexible Printed Circuit) substrate 1.

[0037] The opal gel 4 includes transparent silicone, silicone-modified epoxy resin, and a diffusing agent, and the weight ratio of the silicone, silicone-modified epoxy resin, and diffusing agent is (1 - 1.5):(75 - 100):(0.1 - 0.3).

[0038] In this embodiment, the basic material of the milky white adhesive layer is one or more of transparent silicone and silicone-modified epoxy resin. The silicone and silicone-modified epoxy resin are formulated in a ratio of (1 - 1.5):(75 - 100), preferably formulated according to a weight ratio of 1:75. The silicone and silicone-modified epoxy resin include: one-component room-temperature vulcanizing silicone glass glue, one-component room-temperature vulcanizing silicone rubber, two-component condensation-type room-temperature vulcanizing silicone rubber, two-component addition-type room-temperature vulcanizing silicone rubber, high-temperature curing silicone rubber, two-component epoxy resin glue, etc. In addition, by weight, 0.1 - 0.3 parts of silicone light diffusion powder (average particle size D50 2.0) are added, preferably 0.2 parts, that is, the weight ratio of silicone, silicone-modified epoxy resin and the diffusing agent is preferably 1:75:0.2.

[0039] The thickness range of the fluorescent adhesive 3 is 0.4 - 0.5 mm.

[0040] In this embodiment, the thickness of the fluorescent adhesive 3 can be specifically adjusted according to actual light-emitting requirements to obtain an ideal light-emitting effect, and the preferred thickness is 0.45 mm.

[0041] The fluorescent adhesive 3 includes green fluorescent powder, red fluorescent powder and far-red fluorescent powder. The range of the peak wavelength of the green fluorescent powder is 511.5 - 513.5 nm, the range of the wavelength of the red fluorescent powder is 651.5 - 653.5 nm, the range of the wavelength of the far-red fluorescent powder is 711.5 - 748.5 nm, and the weight ratio of the green fluorescent powder, red fluorescent powder and far-red fluorescent powder is 1:(0.11 - 0.24):(0.06 - 0.14).

[0042] In this embodiment, when the peak wavelength of the green fluorescent powder is preferably 512 nm, the peak wavelength of the red fluorescent powder is preferably 652 nm, and the peak wavelength of the far-red fluorescent powder is preferably 735 nm, the FCOB light strip has the highest light efficiency, the best spectral continuity, and the highest yield of the color rendering index reaching above 99. The weight ratio of the green fluorescent powder, red fluorescent powder and far-red fluorescent powder is 1:(0.11 - 0.24):(0.06 - 0.14). Based on the above weight ratio, the FCOB light strip can achieve a low color temperature (2200K) to a high color temperature (7000K) range, the spectrum is close to the solar spectrum, and the color rendering index (Ra) can reach above 99. The combined use of the green fluorescent powder, red fluorescent powder and far-red fluorescent powder also plays an important role in improving spectral continuity, increasing the color rendering index Ra, color saturation Rg and color fidelity Rf.

[0043] In the process of manufacturing the white FCOB light strip, the length of the white FCOB light strip is 1 meter, and each meter contains 320 FCOB blue light flip-chip chips. The light-emitting area of each chip is precisely coated with fluorescent glue 3, and the dotting thickness is controlled between 0.5 - 0.8 mm to ensure uniform white light output. This light strip is applied to display lighting, capable of providing a uniform and stable light source, avoiding the light spots and color temperature changes in traditional lighting methods.

[0044] Based on the above white FCOB light strip, this case provides a precise dotting and coating method for the white FCOB light strip, used for precise dotting and coating of fluorescent glue 3 on the white FCOB light strip. This precise dotting and coating method includes steps S1 - S4:

[0045] S1. Set multiple flip-chip blue light chips 2 on the substrate 1.

[0046] In this embodiment, multiple flip-chip blue light chips 2 are usually fixed on the substrate 1 by welding.

[0047] S2. Obtain the position information of each flip-chip blue light chip 2; step S2 includes steps S21 - S22:

[0048] S21. Establish a rectangular coordinate system on the plane where the substrate 1 is located.

[0049] S22. Obtain the coordinates of each flip-chip blue light chip 2 within the rectangular coordinate system.

[0050] In this embodiment, a rectangular coordinate system can be established on the plane where the substrate 1 is located. Take the flip-chip blue light chip 2 set on the leftmost side of the substrate 1 as the coordinate origin, and the line connecting the coordinate origin and parallel to the bottom edge of the substrate 1 as the x-axis. In this way, by marking the coordinates of each flip-chip blue light chip 2 through the rectangular coordinate system, the position of each flip-chip blue light chip 2 can be clearly known, and the arrangement and location of each flip-chip blue light chip 2 can also be quickly restored on other software platforms.

[0051] S3. Control multiple fluorescent glues 3 to be respectively coated on multiple flip-chip blue light chips 2 according to the position information of the flip-chip blue light chips 2; step S3 includes steps S31 - S33:

[0052] S31. Determine the coating position of the fluorescent glue 3 according to the position information of the flip-chip blue light chip 2.

[0053] In this embodiment, the coating position of the fluorescent glue 3 is precisely positioned through a computer-controlled dispensing system to ensure uniform coating coverage on each FCOB chip, avoiding light spots or color differences caused by uneven coating of the fluorescent glue 3.

[0054] S32, controlling the coating amount of the fluorescent glue 3 on each flip-chip blue light chip 2 by presetting the valve body flow rate and the screw rod rotation time of the dispensing system.

[0055] In this embodiment, the coating amount of the fluorescent glue 3 on each chip is accurately controlled by adjusting the valve flow rate of the dispensing system and the rotation time of the screw rod to ensure the light emission consistency.

[0056] S33, controlling the thickness of the applied fluorescent glue 3 by presetting the glue output and pressure of the glue dispensing system.

[0057] In this embodiment, the thickness of the fluorescent glue 3 has an important influence on the color temperature and light effect of the light source. By precisely controlling the glue output and pressure of the glue dispensing equipment, the thickness of the fluorescent glue 3 coating is ensured to meet the requirements, thereby achieving the expected white light luminescence effect. Preferably, the thickness range of the fluorescent glue 3 is controlled between 0.4-0.5mm. In short, the fluorescent glue 3 is accurately coated on the light-emitting area of the FCOB chip through high-precision glue dispensing equipment. The coating position, coating amount and coating thickness of each chip are strictly controlled to ensure the uniformity and stability of the light source output.

[0058] S4, sealing the plurality of fluorescent glues 3 in the latex glue 4. Step S4 includes steps S41-S42:

[0059] S41, fixing the latex glue 4 on the substrate 1 to form a receiving space.

[0060] In this embodiment, see Figure 1 - Figure 2 The bottom of the latex glue 4 is fixedly connected to the substrate 1, and the fluorescent glue 3 encapsulates the flip-chip blue light chip 2 and is sealed in the latex glue 4. There is a accommodating space for accommodating the fluorescent glue 3 and the flip-chip blue light chip 2 between the latex glue 4 and the substrate 1.

[0061] S42, sealing the plurality of fluorescent glues 3 in the containing space.

[0062] In this embodiment, the fluorescent glue 3 selected is a special formula that can emit white light under the excitation of a blue light flip chip; and a milky white silica gel with a fixed proportion of diffusing agent added is coated on the outside, which has good thermal stability, does not fade after long-term use, and makes the fluorescent glue 3 emit light more evenly, thereby ensuring the long life and stable light color of the light strip.

[0063] Preferably, the precision dot coating method further comprises steps S5-S6:

[0064] S5. Prepare the organosilicon, organosilicon-modified epoxy resin and diffusing agent in a weight ratio of (1-1.5):(75-100):(0.1-0.3) to generate latex glue 4.

[0065] In this embodiment, the basic material of the milky white adhesive layer is one or more of transparent silicone and silicone-modified epoxy resin. The silicone and silicone-modified epoxy resin are formulated in a ratio of (1 - 1.5):(75 - 100), preferably formulated according to a weight ratio of 1:75. The silicone and silicone-modified epoxy resin include: one-component room-temperature vulcanizing silicone glass glue, one-component room-temperature vulcanizing silicone rubber, two-component condensation-type room-temperature vulcanizing silicone rubber, two-component addition-type room-temperature vulcanizing silicone rubber, high-temperature curing silicone rubber, two-component epoxy resin glue, etc. In addition, by weight, 0.1 - 0.3 parts of silicone light diffusion powder (average particle size D50 2.0) are added, preferably 0.2 parts. That is, the weight ratio of silicone, silicone-modified epoxy resin and the diffusing agent is preferably 1:75:0.2.

[0066] S6. The green phosphor, red phosphor and far-red phosphor are formulated in a weight ratio of 1:(0.11 - 0.24):(0.06 - 0.14) to generate the fluorescent glue 3.

[0067] In this embodiment, when the peak wavelength of the green phosphor is preferably 512 nm, the peak wavelength of the red phosphor is preferably 652 nm, and the peak wavelength of the far-red phosphor is preferably 735 nm, the FCOB light strip has the highest luminous efficiency, the best spectral continuity, and the highest yield with a color rendering index of over 99. The weight ratio of the green phosphor, red phosphor and far-red phosphor is 1:(0.11 - 0.24):(0.06 - 0.14). Based on the above weight ratio, the FCOB light strip can achieve a low color temperature (2200 K) to a high color temperature (7000 K) range, with a spectrum close to the solar spectrum and a color rendering index (Ra) that can reach over 99. The combined use of the green phosphor, red phosphor and far-red phosphor also plays an important role in improving spectral continuity, increasing the color rendering index Ra, color saturation Rg and color fidelity Rf.

[0068] The FCOB light strip with a white appearance is realized by the precise dot coating method. By precisely controlling the coating position and thickness of the fluorescent glue 3, the uniformity and high luminous efficiency of the light source output are ensured, meeting the high-standard lighting requirements and solving the "aggressive" yellow appearance considered by some international customers. That is, in this case, through the precise dot coating method, the problems of uneven light source distribution, unstable color temperature and higher cost in the existing FCOB light strip are solved. Its high-precision coating process and stable optical performance are suitable for application scenarios with high requirements for lighting precision, such as cabinet lighting, display lighting, art lighting and high-precision lighting, etc., and have broad market application prospects.

[0069] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A white FCOB light strip, characterized in that, It includes a substrate, multiple flip-chip blue light chips, multiple fluorescent glues, and an opal glue; The multiple flip-chip blue light chips are arranged on the substrate, the multiple fluorescent glues are respectively coated on the surfaces of the multiple flip-chip blue light chips, and the multiple fluorescent glues are sealed in the opal glue.

2. The white FCOB light strip according to claim 1, wherein The opal glue is fixed on the substrate.

3. The white FCOB light strip according to claim 1, characterized in that, The opal glue includes transparent silicone, silicone-modified epoxy resin, and a diffusing agent, and the weight ratio of the silicone, silicone-modified epoxy resin, and diffusing agent is (1 - 1.5):(75 - 100):(0.1 - 0.3).

4. The white FCOB light strip according to claim 1, characterized in that, The thickness range of the fluorescent glue is 0.4 - 0.5 mm.

5. The white FCOB light strip according to claim 1, wherein The fluorescent glue includes a green phosphor, a red phosphor, and a far-red phosphor. The range of the peak wavelength of the green phosphor is 511.5 - 513.5 nm, the range of the wavelength of the red phosphor is 651.5 - 653.5 nm, the range of the wavelength of the far-red phosphor is 711.5 - 748.5 nm, and the weight ratio of the green phosphor, red phosphor, and far-red phosphor is 1:(0.11 - 0.24):(0.06 - 0.14).

6. A precision dotting and coating method for a white FCOB light strip, which is used for precision dotting and coating of fluorescent glue on the white FCOB light strip according to any one of claims 1-5, and is characterized in that, The precise dot coating method includes: Arranging multiple flip-chip blue light chips on a substrate; Obtaining the position information of each flip-chip blue light chip; Controlling the multiple fluorescent glues to be respectively coated on the multiple flip-chip blue light chips according to the position information of the flip-chip blue light chips; Sealing the multiple fluorescent glues in the opal glue.

7. The precision dot coating method according to claim 6, wherein It also includes: Preparing the opal glue by mixing silicone, silicone-modified epoxy resin, and a diffusing agent according to the weight ratio of (1 - 1.5):(75 - 100):(0.1 - 0.3); Preparing the fluorescent glue by mixing a green phosphor, a red phosphor, and a far-red phosphor according to the weight ratio of 1:(0.11 - 0.24):(0.06 - 0.14).

8. The precision dot coating method according to claim 6, wherein The obtaining the position information of each flip-chip blue light chip includes: Establishing a rectangular coordinate system on the plane where the substrate is located; Obtaining the coordinates of each flip-chip blue light chip in the rectangular coordinate system.

9. The precision dot coating method according to claim 6, wherein The controlling the multiple fluorescent glues to be respectively coated on the multiple flip-chip blue light chips according to the position information of the flip-chip blue light chips includes: Determining the coating positions of the fluorescent glue according to the position information of the flip-chip blue light chips; Controlling the coating amount of the fluorescent glue on each flip-chip blue light chip by the valve body flow rate and the screw rod rotation time of a preset dispensing system; Controlling the thickness of the coated fluorescent glue by the glue output amount and pressure of the preset dispensing system.

10. The precision dot coating method according to claim 8, characterized in that, The sealing the multiple fluorescent glues in the opal glue includes: Fixing the opal glue on the substrate to form an accommodating space; Sealing the multiple fluorescent glues in the accommodating space.

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