Multi-channel bidirectional vertical light-emitting COB (Chip On Board) flexible lamp strip

Abstract

The utility model relates to the technical field of flexible lamp strips, in particular to a multi-channel bidirectional vertical light-emitting COB flexible lamp strip. The flexible circuit board comprises a flexible circuit board body, a red light flip chip, a green light flip chip, a blue light flip chip, a white light flip chip, a control IC chip and a signal conductive main circuit, the flexible circuit board body is divided into an upper light-emitting area, a middle area and a lower light-emitting area, and the upper light-emitting area is sequentially connected with the red light flip chip, the green light flip chip and the blue light flip chip. The lower light-emitting area is connected with a white light flip chip, the middle area is connected with a control IC chip and a signal conductive main circuit, four channels of the control IC chip are connected with and control the red light flip chip, the green light flip chip, the blue light flip chip and the white light flip chip respectively, and the signal conductive main circuit is electrically connected with the flip chips. A flexible circuit board is used as a carrier, a circuit is prefabricated, and the light source adopts a flip chip process technology, so that the LED lamp has the characteristics of high reliability, good heat dissipation, small light attenuation, long service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible light strips, in particular to a COB flexible light strip with multi-channel bidirectional vertical light emission. Background Technique

[0002] With the increasing development of the decoration industry, the demand for ambient lighting and soft light lighting in daily life has also increased sharply. There are various styles of traditional light strips on the market, and the installation methods are also very different. For indoor installation, aluminum structural profiles are used as the installation carrier of the light strip. Its main purpose is to solve functions such as heat dissipation, concealment, and beautification. Aluminum profile structures with different shapes cause the light-emitting direction of the light strip to change with the structure. Just like conventional indoor decoration, now the market is gradually popularizing main-light-free lighting, and the demand for light strips is also diversified. Regarding the demand for colors, when both lighting and atmosphere need to be achieved at the same time, multi-color light strips will be selected, such as RGB+W products. This product has multiple colors such as red, green, blue + white light. Different currents are output by the controller for the three colors of RGB to make the color change in thousands of ways. Then the color of W can be low color temperature or high color temperature. The above products are the effects that traditional special multi-color light strips can achieve. When installing, corresponding aluminum structural profiles will be selected in different areas, and the installation is relatively complicated. Moreover, traditional light strips also have problems such as low reliability, poor heat dissipation, and fast light decay. Content of the Utility Model

[0003] The utility model provides a COB flexible light strip with multi-channel bidirectional vertical light emission, aiming to solve the technical problems existing in traditional light strips.

[0004] The utility model provides a COB flexible light strip with multi-channel bidirectional vertical light emission, which includes a flexible circuit board, a red flip-chip, a green flip-chip, a blue flip-chip, a white flip-chip, a four-channel control IC chip, and a signal conductive main line. The flexible circuit board is divided into an upper light-emitting area, a middle area, and a lower light-emitting area. The upper light-emitting area is sequentially connected with a red flip-chip, a green flip-chip, and a blue flip-chip. The lower light-emitting area is connected with a white flip-chip. The middle area is connected with a control IC chip and a signal conductive main line. The four channels of the control IC chip are respectively connected to and control the red flip-chip, the green flip-chip, the blue flip-chip, and the white flip-chip. The signal conductive main line is electrically connected to the red flip-chip, the green flip-chip, the blue flip-chip, and the white flip-chip respectively.

[0005] As a further improvement of the utility model, the white flip-chip is formed by coating a blue flip-chip with phosphor for excitation.

[0006] As a further improvement of the present utility model, the main signal conduction line includes a positive electrode pad and a negative electrode pad. A plurality of positive electrode pads and negative electrode pads are provided on the front surface of the flexible printed circuit board. The conductive pins of the red light flip chip, green light flip chip, blue light flip chip, and white light flip chip are respectively connected to the positive electrode pad and the negative electrode pad.

[0007] As a further improvement of the present utility model, the main signal conduction line further includes a positive main line and a negative main line. The positive main line and the negative main line are arranged on the back surface of the flexible printed circuit board. The flexible printed circuit board is provided with conductive vias. The positive main line and the negative main line are respectively connected to the positive electrode pad and the negative electrode pad through the conductive vias.

[0008] As a further improvement of the present utility model, the conductive vias include a red light conductive via, a green light conductive via, a blue light conductive via, and a white light conductive via. The red light conductive via, green light conductive via, and blue light conductive via are located in the upper light-emitting area. The white light conductive via is located in the lower light-emitting area. The positive main line and the negative main line respectively conduct the conductive pins of the red light flip chip, green light flip chip, and blue light flip chip through the red light conductive via, green light conductive via, and blue light conductive via. The positive main line and the negative main line respectively conduct the conductive pins of the white light flip chip through the white light conductive via.

[0009] As a further improvement of the present utility model, the main signal conduction line further includes a signal input pad and a signal main line. The signal input pad is arranged on the front surface of the flexible printed circuit board. The signal main line is arranged on the back surface of the flexible printed circuit board. The flexible printed circuit board is provided with signal vias. The signal main line is connected to the signal input pad through the signal vias. The signal pin of the control IC chip is connected to the signal input pad.

[0010] As a further improvement of the present utility model, a plurality of independent copper pad areas are provided on the back surface of the flexible printed circuit board in the lower light-emitting area. Each independent copper pad area corresponds to a white light flip chip located on the front surface of the flexible printed circuit board. The independent copper pad area is connected to the main wire of the white light flip chip. The independent copper pad area covers the area of the white light flip chip.

[0011] As a further improvement of the present utility model, the multi-channel bidirectional vertical light-emitting COB flexible light strip further includes a power supply current-limiting and voltage-regulating resistor, a filter capacitor, a signal input protection current-limiting resistor, and a light-emitting current-limiting resistor. The power supply current-limiting and voltage-regulating resistor, filter capacitor, and signal input protection current-limiting resistor are respectively connected around the control IC chip. Light-emitting current-limiting resistors are respectively connected to the four-way series circuits of the red light flip chip, green light flip chip, blue light flip chip, and white light flip chip.

[0012] As a further improvement of the present utility model, the multi-channel bidirectional vertically emitting COB flexible light strip further includes a red, green, and blue light-shielding colloid and a white light-shielding colloid. One end of the red, green, and blue light-shielding colloid is connected to the flexible circuit board, and one end of the red, green, and blue light-shielding colloid extends above the upper light-emitting area. One end of the white light-shielding colloid is connected to the flexible circuit board, and one end of the white light-shielding colloid extends above the lower light-emitting area.

[0013] As a further improvement of the present utility model, the multi-channel bidirectional vertically emitting COB flexible light strip further includes a red, green, and blue diffusion protection glue and a white light diffusion protection glue. The red, green, and blue diffusion protection glue is filled in the area between the red, green, and blue light-shielding colloid and the flexible circuit board and covers the red flip-chip, green flip-chip, and blue flip-chip. The white light diffusion protection glue is filled in the area between the white light-shielding colloid and the flexible circuit board and covers the white flip-chip.

[0014] The beneficial effects of the present utility model are as follows: By using an FPCB flexible circuit board as a carrier, prefabricating the circuit, designing a special position of the light-emitting area, and reserving the position area that needs to be covered with glue, its light source adopts the flip-chip process technology, which has the characteristics of high reliability, good heat dissipation, small light decay, and long service life. Description of the Drawings

[0015] Figure 1 is the overall structure diagram of the multi-channel bidirectional vertically emitting COB flexible light strip of the present utility model;

[0016] Figure 2 is the front structure diagram of the multi-channel bidirectional vertically emitting COB flexible light strip of the present utility model;

[0017] Figure 3 is the back structure diagram of the multi-channel bidirectional vertically emitting COB flexible light strip of the present utility model;

[0018] Figure 4 is the side structure diagram of the multi-channel bidirectional vertically emitting COB flexible light strip of the present utility model. Detailed Embodiments

[0019] In order to make the purpose, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] The present utility model provides a multi-channel bidirectional vertically emitting COB flexible light strip structure. This product mainly relates to a spotless COB flexible light strip for decorative atmosphere and lighting.

[0021] Such as Figures 1 to 4As shown in the figure, a multi-channel bidirectional vertically-emitting COB flexible light strip of the present utility model includes a flexible circuit board 1, a red flip-chip 21, a green flip-chip 22, a blue flip-chip 23, a white flip-chip 24, a four-channel control IC chip 3, and a signal conductive main line 4. The flexible circuit board 1 is divided into an upper light-emitting area 11, a middle area 12, and a lower light-emitting area 13. The upper light-emitting area 11 is sequentially connected with a red flip-chip 21, a green flip-chip 22, and a blue flip-chip 23. The lower light-emitting area 13 is connected with a white flip-chip 24. The middle area 12 is connected with a control IC chip 3 and a signal conductive main line 4. The four channels of the control IC chip 3 are respectively connected to and control the red flip-chip 21, the green flip-chip 22, the blue flip-chip 23, and the white flip-chip 24. The signal conductive main line 4 is electrically connected to the red flip-chip 21, the green flip-chip 22, the blue flip-chip 23, and the white flip-chip 24 respectively.

[0022] The white flip-chip 24 is formed by coating a phosphor on the blue flip-chip 23 for excitation.

[0023] Above a long-strip FPC flexible circuit board 1, there are three areas: an upper light-emitting area 11, a middle area 12, and a lower light-emitting area 13. Among them, the upper light-emitting area 11 is an area for three flip-chips of red, green, and blue. The lower light-emitting area 13 is an area for the white flip-chip 24. Any color temperature requirement can be achieved by coating a phosphor on the blue flip-chip 23 for excitation. The middle area 12 is an area for the signal conductive main line 4 and electronic components area. There are a positive electrode, a signal input, and a negative electrode input main line. Among them, a four-channel control IC chip 3 is placed in the component area. The purpose is to respectively control the red, green, blue, and white light-emitting sequences and color mixing effects in the upper light-emitting area 11 and the lower light-emitting area 13.

[0024] The signal conductive main line 4 includes a positive electrode pad 41 and a negative electrode pad 42. A plurality of positive electrode pads 41 and negative electrode pads 42 are provided on the front surface of the flexible circuit board 1. The conductive pins of the red flip-chip 21, the green flip-chip 22, the blue flip-chip 23, and the white flip-chip 24 are respectively connected to the positive electrode pad 41 and the negative electrode pad 42.

[0025] The signal conductive main line 4 further includes a positive electrode main line 43 and a negative electrode main line 44. The positive electrode main line 43 and the negative electrode main line 44 are arranged on the back surface of the flexible circuit board 1. The flexible circuit board 1 is provided with conductive vias 5. The positive electrode main line 43 and the negative electrode main line 44 are respectively connected to the positive electrode pad 41 and the negative electrode pad 42 through the conductive vias 5.

[0026] The conductive through hole 5 includes a red light conductive through hole 51, a green light conductive through hole 52, a blue light conductive through hole 53, and a white light conductive through hole 54. The red light conductive through hole 51, the green light conductive through hole 52, and the blue light conductive through hole 53 are located in the upper light-emitting area 11, and the white light conductive through hole 54 is located in the lower light-emitting area 13. The positive main circuit 43 and the negative main circuit 44 are respectively connected to the conductive pins of the red light flip chip 21, the green light flip chip 22, and the blue light flip chip 23 through the red light conductive through hole 51, the green light conductive through hole 52, and the blue light conductive through hole 53. The positive main circuit 43 and the negative main circuit 44 are respectively connected to the conductive pins of the white light flip chip 24 through the white light conductive through hole 54.

[0027] The signal conductive main circuit 4 also includes a signal input pad 45 and a signal main circuit 46. The signal input pad 45 is arranged on the front side of the flexible circuit board 1, and the signal main circuit 46 is arranged on the back side of the flexible circuit board 1. The flexible circuit board 1 is provided with a signal via, and the signal main circuit 46 is connected to the signal input pad 45 through the signal via, and the signal pin of the control IC chip 3 is connected to the signal input pad 45.

[0028] The red, green and blue flip chips are electrically connected through the conductive through holes 5 on the front and back prefabricated circuits. The positive pad 41, the negative pad 42 and the signal input pad 45 of the front circuit are mainly designed for the placement of light-emitting diodes and electronic components. The positive main circuit 43, the negative main circuit 44 and the signal main circuit 46 of the back circuit are for conduction. The regional circuits on the front cannot be cross-designed, so it is necessary to design air-avoiding circuits on the back. Each color has an independent circuit, which is realized in a parallel-then-series manner in a single group, so that it is connected in position with the output pin of the control IC chip 3.

[0029] The flexible circuit board 1 is provided with a plurality of independent copper pad areas 14 on the back side of the lower light emitting area 13, each independent copper pad area 14 corresponds to a white light flip chip 24 located on the front side of the flexible circuit board 1, and the independent copper pad area 14 is connected to the main wire line of the white light flip chip 24, and the independent copper pad area 14 covers the area of ​​the white light flip chip 24.

[0030] The white light flip chip at position 24 operates in a single color mode. The white light circuit is simple, and only a single layer of copper foil on the front is required to achieve the circuit layout, forming an independent circuit conduction. Therefore, there is no need for a backside conduction design for the circuit. However, when multiple colors such as red, blue, and green are on the same plane, backside circuit conduction connections need to be made. A single-sided design with circuit intersections will cause short circuits and prevent the circuit from conducting. When considering conductivity, it is also taken into account that the chip placed at the edge is prone to bending and scratching. In the backside circuit, a copper pad area 14 that is 2 times larger than the chip is etched out of the copper skin, presenting an independent square shape. When bent, the disconnected part in the middle will play a role in relieving stress, and the stress during bending will not be transmitted to the LED electrode pads of the white light flip chip 24, causing solder joint failure. During the production process, reinforcement treatment needs to be carried out on the independent copper pad area 14. The reinforcement mainly increases the thickness and smoothness to provide absolute protection for the flip LED.

[0031] The multi-channel bidirectional vertical-emitting COB flexible light strip also includes a power supply current-limiting and voltage-regulating resistor 31, a filter capacitor 32, a signal input protection current-limiting resistor 33, and a light-emitting current-limiting resistor 25. The power supply current-limiting and voltage-regulating resistor 31, the filter capacitor 32, and the signal input protection current-limiting resistor 33 are respectively connected around the control IC chip 3. Light-emitting current-limiting resistors 25 are respectively connected to the four series circuits of the red light flip chip 21, the green light flip chip 22, the blue light flip chip 23, and the white light flip chip 24. The light-emitting current-limiting resistor 25 is divided into a red light current-limiting resistor 251, a green light current-limiting resistor 252, a blue light current-limiting resistor 253, and a white light current-limiting resistor, corresponding to the four series circuits of the red light flip chip 21, the green light flip chip 22, the blue light flip chip 23, and the white light flip chip 24 respectively.

[0032] The middle area 12 is coated with high-transparency or foggy transparent silicone, or it can also be black or other colored silicone. The main purpose is to protect the components, achieving effects such as dust prevention, fog prevention, and dirt prevention, making its appearance flat and smooth, and providing more options according to the customer's installation environment.

[0033] The components around the control IC chip 3 include a power supply current-limiting and voltage-regulating resistor 31, a filter capacitor 32, and a signal input protection current-limiting resistor 33. To reduce the power consumption generated by the control IC chip 3 when working and connecting the circuits of the four corresponding LEDs of the red, green, blue, and white flip chips 2, a light-emitting current-limiting resistor 25 is added to the series circuits of the four red, green, blue, and white flip chips 2 to prevent the control IC chip 3 from failing due to excessive power consumption in the case of full color mixing.

[0034] The multi-channel bidirectional vertically-emitting COB flexible light strip further includes a red-green-blue light-shielding colloid 61 and a white light-shielding colloid 62. One end of the red-green-blue light-shielding colloid 61 is connected to the flexible circuit board 1, and one end of the red-green-blue light-shielding colloid 61 extends above the upper light-emitting area 11. One end of the white light-shielding colloid 62 is connected to the flexible circuit board 1, and one end of the white light-shielding colloid 62 extends above the lower light-emitting area 13. The red-green-blue light-shielding colloid 61 and the white light-shielding colloid 62 can serve as light-guiding surfaces, so that the light emitted by the red-green-blue flip chips and the white light flip chip 24 is emitted in a specified direction.

[0035] The multi-channel bidirectional vertically-emitting COB flexible light strip further includes a red-green-blue diffusion protection glue 71 and a white light diffusion protection glue 72. The red-green-blue diffusion protection glue 71 is filled in the area between the red-green-blue light-shielding colloid 61 and the flexible circuit board 1 and covers the red light flip chip 21, the green light flip chip 22, and the blue light flip chip 23. The white light diffusion protection glue 72 is filled in the area between the white light-shielding colloid 62 and the flexible circuit board 1 and covers the white light flip chip 24.

[0036] By covering with the diffusion protection glue, the light-emitting direction of the red-green-blue flip chips is changed to vertically emit light up and down. When pasted on a flat wall, it is necessary to irradiate the ceiling atmosphere. The red-green-blue light-emitting diodes in the upper part are controlled by a controller to work, so that they are mixed to produce a variety of color differences. When lighting is required, the red-green-blue in the upper part can be turned off by the controller, and the white light in the lower part works, and various effects such as chasing and transformation can also be achieved, and the installation is extremely convenient.

[0037] The front side of the FPC flexible circuit board 1 is reserved with limit scale lines. The main purpose is to facilitate the positioning of production equipment. The path of dispensing glue is evenly coated with the set scale lines to ensure the consistency of the product appearance. Among them, the width and height of the diffusion protection glue coated above the red-green-blue-white flip chips are the same, providing a relatively flat basis when applying the secondary light-shielding colloid, so as to ensure the uniformity and smoothness of the overall appearance after complete molding.

[0038] The present utility model relates to a multi-channel bidirectional vertically-emitting COB flexible light strip and a manufacturing method of the light strip. The manufacturing method involves technologies such as changes in multiple structures and process control.

[0039] Specifically, the multi-channel bidirectional vertically-emitting COB flexible light strip of the present utility model is manufactured by the following steps:

[0040] Step 1: First, perform circuit drawing and design the circuit data of the independent functional area;

[0041] Step 2: Manufacture the flexible circuit board 1 through prefabricated circuits by means of multi-layer printing and etching to form a circuit layer, a filling layer, a reinforcing layer, a functional area, etc.; During printing, it can be printed as a whole, and finally cut into strips to prepare the material matching.

[0042] Step 3: Perform die bonding on the fabricated circuit board. First, solder the red, green, and blue flip chips on the surface of the flexible printed circuit board 1, and then use a mounter to mount the peripheral control IC chip 3. Die bonding is to fix the LED flip chip on the nodes of the circuit layer with solder paste or other colloids, so that the electrodes of the LED flip chip form an electrical connection with the circuit layer;

[0043] Step 4: Before Step 3, other current-limiting resistors can be soldered on the flexible printed circuit board 1 using production equipment, or the current-limiting resistors can be fixed on the circuit board with solder paste or other colloids simultaneously or after fixing the flip chip;

[0044] Step 5: Put the FPC flexible printed circuit board 1 after die bonding and chip mounting into a reflow oven to solder the flip chip, control IC chip 3, and current-limiting resistor in the designated area of the flexible printed circuit board 1;

[0045] Step 6: Modulate the milky paste of silica gel combined with titanium dioxide nanometer powder required. Program the dispenser according to the shape of the flexible printed circuit board 1. Align the glue outlet of the dispenser head with the reserved positioning line on the flexible printed circuit board 1. After dispensing, coat the red, green, and blue light-emitting diode areas, and coat the area below with the die bonding with phosphor added. After completion, put it into an oven for micro-curing, then prepare a light-shielding layer glue for area coverage, and perform high-temperature baking at 150 °C for complete curing after the operation is completed;

[0046] Step 7: After taking out the materials after high-temperature baking, perform pre-cutting, electrical testing, and visual inspection, and then simply package them after completion;

[0047] Step 8: Solder the board according to the required length and size of the customer to make it reach the required length of the customer. Connect the wires and power on the aging rack for normal-temperature aging. After completion, wind it on a reel, bag it, inspect it, and store it in the warehouse for business shipment.

[0048] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A multi-channel bidirectional vertical light-emitting COB flexible light strip, characterized in that: It includes a flexible circuit board, a red light flip chip, a green light flip chip, a blue light flip chip, a white light flip chip, a four-channel control IC chip, and a signal conductive main line. The flexible circuit board is divided into an upper light-emitting area, a middle area, and a lower light-emitting area. The upper light-emitting area is connected with a red light flip chip, a green light flip chip, and a blue light flip chip in sequence, the lower light-emitting area is connected with a white light flip chip, the middle area is connected with a control IC chip and a signal conductive main line, the four channels of the control IC chip are respectively connected to and control the red light flip chip, the green light flip chip, the blue light flip chip, and the white light flip chip, and the signal conductive main line is electrically connected to the red light flip chip, the green light flip chip, the blue light flip chip, and the white light flip chip, respectively.

2. According to claim 1, the multi-channel bidirectional vertical light-emitting COB flexible light strip is characterized in that: The white light flip chip is formed by coating a blue light flip chip with fluorescent powder for excitation.

3. According to claim 1, the multi-channel bidirectional vertical light-emitting COB flexible light strip is characterized in that: The signal conductive main circuit includes a positive pad and a negative pad. The front of the flexible circuit board is provided with a plurality of positive pads and negative pads. The conductive pins of the red light flip chip, the green light flip chip, the blue light flip chip and the white light flip chip are respectively connected to the positive pad and the negative pad.

4. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 3, characterized in that: The signal conductive main circuit also includes a positive main circuit and a negative main circuit. The positive main circuit and the negative main circuit are arranged on the back of the flexible circuit board. The flexible circuit board is provided with conductive through holes. The positive main circuit and the negative main circuit are respectively connected to the positive pad and the negative pad through the conductive through holes.

5. According to claim 4, the multi-channel bidirectional vertical light-emitting COB flexible light strip is characterized in that: The conductive through holes include red light conductive through holes, green light conductive through holes, blue light conductive through holes, and white light conductive through holes. The red light conductive through holes, green light conductive through holes, and blue light conductive through holes are located in the upper light emitting area, and the white light conductive through holes are located in the lower light emitting area. The positive main circuit and the negative main circuit are respectively connected to the conductive pins of the red light flip chip, the green light flip chip, and the blue light flip chip through the red light conductive through holes, the green light conductive through holes, and the blue light conductive through holes. The positive main circuit and the negative main circuit are respectively connected to the conductive pins of the white light flip chip through the white light conductive through holes.

6. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 1, characterized in that: The signal conductive main circuit also includes a signal input pad and a signal main circuit. The signal input pad is arranged on the front side of the flexible circuit board, and the signal main circuit is arranged on the back side of the flexible circuit board. The flexible circuit board is provided with a signal via hole. The signal main circuit is connected to the signal input pad through the signal via hole, and the signal pin of the control IC chip is connected to the signal input pad.

7. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 1, characterized in that: The flexible circuit board is provided with a plurality of independent copper pad areas on the back side of the lower light emitting area, each of the independent copper pad areas corresponds to a white light flip chip located on the front side of the flexible circuit board, the independent copper pad area is connected to the main wire line of the white light flip chip, and the independent copper pad area covers the area of ​​the white light flip chip.

8. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 1, characterized in that: It also includes a power supply current limiting and voltage stabilizing resistor, a filter capacitor, a signal input protection current limiting resistor, and a light emitting current limiting resistor. The power supply current limiting and voltage stabilizing resistor, the filter capacitor, and the signal input protection current limiting resistor are respectively connected around the control IC chip, and the four series circuits of the red light flip chip, the green light flip chip, the blue light flip chip, and the white light flip chip are respectively connected with the light emitting current limiting resistor.

9. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 1, characterized in that: It also includes a red, green, and blue light-shielding colloid and a white light-shielding colloid, wherein one end of the red, green, and blue light-shielding colloid is connected to the flexible circuit board, and one end of the red, green, and blue light-shielding colloid extends above the upper light-emitting area, and one end of the white light-shielding colloid is connected to the flexible circuit board, and one end of the white light-shielding colloid extends above the lower light-emitting area.

10. The multi-channel bidirectional vertically emitting COB flexible light strip according to claim 9, characterized in that: It also includes red, green and blue diffusion protective glue and white light diffusion protective glue. The red, green and blue diffusion protective glue fills the area between the red, green and blue light-shielding colloid and the flexible circuit board and covers the red light flip chip, the green light flip chip and the blue light flip chip. The white light diffusion protective glue fills the area between the white light light-shielding colloid and the flexible circuit board and covers the white light flip chip.

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