A method for transferring LED chips

Abstract

The present invention provides an LED chip transfer method, in which the LED chip is transferred to an LED arrangement board through an LED transfer device. The LED transfer device includes a fluid pool and pipes 1, 2, and 3, as well as an arrangement board that is detachably installed in the fluid pool. The LED arrangement board is provided with two or more slots. The flow direction of the fluid in pipe 2 is opposite to the flow direction of the fluid in pipe 3. The flow rate of the fluid on pipes 1, 2, and 3 is determined according to the pre-stored LED chip size and fluid density, and the driving force of the pump on pipe 1, the pump on pipe 2, and the pump on pipe 3 is determined according to the flow rate of the fluid on pipes 1, 2, and 3 to achieve the transfer of the LED chip in chamber 1 to the LED arrangement board, and the LED chips can be transferred in batches.

Description

Technical Field

[0001] The present invention relates to the technical field of LED packaging, and in particular to a method for transferring an LED chip. Background Art

[0002] The production process of Mini / Micro LED display panels is long and complex, mainly including chip preparation, chip transfer, and defect detection and repair. Among them, chip transfer is a key step in the process chain, facing the dual challenges of large transfer quantity and high precision. Taking a 4K screen as an example, the resolution is 4096×2160, that is, there are 8847360 pixels, and there are 26542080 RGB LEDs (8847360 3) According to the swing-arm operation, the production capacity is 45,000 chips per hour, and it takes nearly 590 hours to produce a 4K screen. This transfer speed greatly limits the production capacity of Mini / Micro LED display panels. To address this technical problem, Chinese patent application No. 202110254824.1, published on September 13, 2022, discloses a chip transfer system. During chip transfer, a transfer substrate carrying the chip to be transferred can be directly placed into a first chamber. A first adsorption force generated by a corresponding first adsorption device is controlled by an adsorption control device to separate the chip from the transfer substrate. Then, under the action of the first adsorption force generated by the first adsorption device and the thrust generated by the fluid flowing from the first chamber to the second chamber controlled by the fluid control device, the chip moves to a set position in the second chamber with the fluid. Then, the first adsorption force generated by the first adsorption device and the fluid are controlled to drop the chip onto the corresponding chip bonding area on the target substrate. This greatly simplifies the chip transfer process, improves its transfer efficiency, and can well meet the needs of large-scale transfer of Micro LED chips.

[0003] However, in the above method, after the chip is moved from the first chamber to the corresponding position in the second chamber, the chip needs to be calibrated by the alignment plate, and then the chip needs to be covered and fixed by the cover plate. The chip can only be transferred after being aligned with one alignment plate at a time. The operation in this process is complicated and the chip transfer efficiency is low. Summary of the Invention

[0004] The present invention aims to provide a method for transferring LED chips, which can quickly transfer LED chips according to a flow rate tested in advance, has high transfer efficiency and is simple to operate.

[0005] To achieve the above objectives, a method for transferring LED chips is provided. The method transfers the LED chips to an LED layout board using an LED transfer device. The LED transfer device includes a fluid pool and pipelines 1, 2, and 3, and a layout board that is detachably mounted within the fluid pool. The LED layout board is provided with two or more slots. The flow direction of the fluid in pipeline 2 is opposite to the flow direction of the fluid in pipeline 3. The method includes the following steps:

[0006] S0. The density of the fluid in the fluid pool of the preset LED transfer device is less than the density of the LED chip to be transferred; the flow speed of the fluid in the left and right directions and the up and down directions in chamber one is adjusted by adjusting the driving force of the pump on pipeline one, the pump on pipeline two and the pump on pipeline three on the LED transfer device, and the flow speed of the fluid in corresponding pipeline one, pipeline two and pipeline three when a preset LED chip in chamber one enters the LED layout board and the corresponding storage settings of the LED chip and the fluid density are recorded.

[0007] S2. Determine the flow rate of the fluid on pipeline one, pipeline two and pipeline three according to the pre-stored LED chip size and fluid density, and determine the driving force of the pump on pipeline one, pipeline two and pipeline three according to the flow rate of the fluid on pipeline one, pipeline two and pipeline three to transfer the LED chip in chamber one to the LED layout board.

[0008] The above arrangement, by filling the fluid pool with fluid, facilitates the better transfer of LED chips through fluid flow; realizes the flow of fluid in the upper and lower directions of the fluid pool by driving the pump on pipeline one, and realizes the flow of fluid in the left and right directions of the fluid pool by driving the pump on pipeline two and the pump on pipeline three; enables the fluid in chamber one to form a circulating flow, and adjusts the driving force of the pump on pipeline one, the pump on pipeline two and the pump on pipeline three according to the pre-tested flow rate of the fluid on pipeline one, pipeline two and pipeline three, so that when the LED chip is transferred to the LED arrangement board, it can operate at a more reliable fluid flow rate so that more LED chips can be transferred to the LED arrangement board, thereby realizing the transfer of a certain number of LED chips, and also ensuring the transfer efficiency and stability.

[0009] Furthermore, step S0 includes the following steps:

[0010] S01. After the fluid pool is filled with fluid, two or more LED chips are placed in a chamber of the fluid pool, and the pump on pipeline two, pipeline three, and pipeline one is started so that the fluid flow drives the LED chip to be transferred to the LED layout board;

[0011] S02 confirms the flow of LED chips; if the number of LED chips entering the LED arrangement board meets a preset number, proceeds to step S06; otherwise, proceeds to steps S03-S05;

[0012] S03. If the LED chip does not move downward, increase the driving force of the pump on the pipeline so that the flow rate of the fluid in pipelines two and three is less than the flow rate of the fluid in pipeline one; proceed to step S02;

[0013] S04. If the LED chips accumulate, increase the driving force of the first pump so that the flow rate of the fluid in pipes two and three is greater than the flow rate of the fluid in pipe one, and proceed to step S02;

[0014] S05. If a preset number of LED chips enter the LED arrangement board in reverse, the driving force of the pump on the pipeline three is increased, so that the LED chips entering the LED arrangement board in reverse are separated from the LED arrangement board and re-enter the chamber one, and then step S02 is entered;

[0015] S06. Record the flow rates of the fluids in pipeline 2, pipeline 3, and pipeline 1.

[0016] According to the above setting, during the test process, if the LED chip in chamber one cannot move downward, the flow rate of the fluid in pipe one in the vertical direction will be increased to achieve vertical movement. If the LED chips in chamber one are stacked together, the flow rate of the fluid in pipes two and three will be increased, thereby disrupting the LED chips in chamber one. When most of the LED chips enter the LED arrangement board in the reverse direction, the flow rate of the fluid in pipes two and three will be increased, and the LED chips entering the LED arrangement board will be sucked out into the chamber for further adjustment. This ensures that a preset proportion of LED chips can enter the LED arrangement board, so that the recorded flow rates of pipes two and three can ensure that certain LED chips can reliably enter the LED arrangement board, providing a certain degree of reliability for the subsequent actual transfer process.

[0017] Furthermore, the density of the LED chips is greater than the density of the fluid in the fluid pool, and the number of LED chips is 10 to 20 times the number of slots provided on the LED layout plate.

[0018] In the above settings, the setting of the fluid density can ensure that the LED chips can sink into the LED arrangement plate, and the setting of the number of LED chips can promote the LED chips to enter the grooves.

[0019] Furthermore, chamber one and chamber two are provided inside the fluid pool, an LED arrangement plate is arranged between chamber one and chamber two and separates chamber one from chamber two, and the LED arrangement plate is provided with grooves and through holes matching the LED chips, the grooves and through holes are connected to each other, and the two ends of pipe one are respectively connected to chamber one and chamber two.

[0020] The above arrangement can increase the power of the fluid in the fluid pool by driving the first pump pipeline, so that when the fluid flows from the first chamber through the slot and the through hole into the second chamber, it can drive the LED chip to be transferred into the slot.

[0021] Furthermore, flow detectors are provided on pipeline 1, pipeline 2 and pipeline 3;

[0022] Step S0 also includes: adjusting the driving force of the pump on pipeline 1, the pump on pipeline 2 and the pump on pipeline 3 on the LED transfer device to adjust the flow rate of the fluid in the left and right directions and the up and down directions in chamber 1, and then recording the flow rate of the fluid in pipeline 1, pipeline 2 and pipeline 3 corresponding to when a preset value of LED chip in chamber 1 enters the LED layout board through a flow detector.

[0023] With the above settings, the flow rate of the pipeline can be detected through the flow detector, and then the operation of the pump can be controlled, thereby achieving the effect of controlling the flow rate of the pipeline.

[0024] Furthermore, the cross-sectional length of the chamber one is greater than the cross-sectional length of the chamber two, and the length of the LED arrangement plate matches the cross-sectional length of the chamber one.

[0025] The above arrangement enables the LED arrangement board to be placed and fixed in chamber one.

[0026] Furthermore, there are more than two slots arranged side by side on the LED layout board, the open end of the slot is connected to the first chamber, the bottom end of the slot is connected to one end of the through hole, and the other end of the through hole is connected to the second chamber.

[0027] The above arrangement enables the fluid in the first chamber to flow through the slots and through holes in sequence and then flow into the second chamber.

[0028] Furthermore, a pump is provided on the pipeline one, one end of the pipeline one is connected to chamber one, and the other end of the pipeline one is connected to chamber two; a pump is provided on the pipeline two, one end of the pipeline two is connected to the upper end of one side of chamber one, and the other end of the pipeline two is connected to the upper end of the other side of chamber one; a pump is provided on the pipeline three, one end of the pipeline three is connected to the lower end of one side of chamber one, and the other end of the pipeline three is connected to the lower end of the other side of chamber one.

[0029] The above arrangement facilitates the pump driving the fluid in pipe one to flow into chamber one, and then the fluid in chamber one flows into chamber two through the grooves and through holes, thereby forming a circulating flow loop; this allows the fluid in the upper part of chamber one to flow into pipe two, and this allows the fluid in the lower part of chamber one to flow into pipe three.

[0030] Furthermore, the length L2 of the slot is 5% to 10% greater than the length L1 of the LED chip; the thickness of the LED chip is set to W1, and the height of the slot is set to W2. The following relationship exists between the thickness W1 of the LED chip and the height W2 of the slot:

[0031] ,

[0032] The following relationship exists between the slot height W2 and the LED chip length L1:

[0033] .

[0034] The above arrangement facilitates the fluid in the first chamber to carry the LED chip out of the groove during the circulation process when the LED chip is not in a completely consistent state with the groove.

[0035] Furthermore, filters are provided at the connection between chamber 2 and pipe 1, and at the connection between chamber 1 and pipe 2 and pipe 3.

[0036] The above arrangement can prevent the LED chip in the fluid chamber from flowing into the pipeline along with the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention.

[0038] Figure 2 Schematic diagram of fluid flow in the present invention.

[0039] Figure 3 This is a schematic diagram of the LED chip and slot structure in the present invention.

[0040] Figure 4 This is a schematic diagram of the complete transfer of LED chips to the LED layout board in the present invention.

[0041] Figure 5 Schematic diagram of incomplete transfer of LED chips to the LED layout board in the present invention.

[0042] Figure 6 This is a schematic diagram showing that the LED chip and the groove are completely consistent with each other in the present invention.

[0043] Figure 7 This is a schematic diagram showing that the LED chip and the groove do not completely match in the present invention.

[0044] Figure 8 It is the workflow diagram of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] like Figure 1-7 As shown, the present invention provides an LED transfer method, in which an LED chip is transferred to an LED arrangement board through an LED transfer device, the LED transfer device includes a fluid pool 1, an LED arrangement board 2, a pump 3 and a pipeline, the pump 3 is arranged on the pipeline, and the pipeline includes pipeline one 41, pipeline two 42 and pipeline three 43. In this embodiment, pipeline one 41, pipeline two 42 and pipeline three 43 are all provided with a pump 3, so that the fluid in the pipeline is driven by the pump 3 to achieve flow, the fluid pool 1 is provided with a chamber one 11 and a chamber two 12, the cross-sectional length of chamber one 11 is greater than the cross-sectional length of chamber two 12, the LED arrangement board 2 is arranged between chamber one 11 and chamber two 12 and separates chamber one 11 and chamber two 12, the length of the LED arrangement board 2 matches the cross-sectional length of chamber one 11, the LED arrangement board 2 is provided with two or more slots 6 that match the LED chip 5, the slots 6 are arranged side by side and spaced apart on the LED arrangement board 2, and the slots 6 are connected and communicated with the through holes 7. In this embodiment, the open end of the slot 6 is connected to the chamber 11, the bottom end of the slot 6 is connected to one end of the through hole 7, and the other end of the through hole 7 is connected to the chamber 2 12, so that the fluid in the chamber 11 flows through the slot 6 and the through hole 7 in sequence, and then flows into the chamber 2 12. One end of the pipe 1 41 is connected to the chamber 1 11, and the other end of the pipe 1 41 is connected to the chamber 2 12. The other end of the pipe 1 41, the pipe 2 42 and the pipe 3 43 are all provided with flow detectors. In this embodiment, A flow detector 1 81 is provided on pipe 1 41, a flow detector 2 82 is provided on pipe 2 42, and a flow detector 3 83 is provided on pipe 3 43. This facilitates driving the fluid in pipe 1 41 into chamber 1 1 through pump 3, and then the fluid in chamber 1 11 flows into chamber 2 12 through slot 6 and through hole 7, thereby forming a circulating flow loop. At the same time, the flow rate of the pipeline can be detected by the flow detector, and the operation of the pump can be controlled, thereby achieving the effect of controlling the flow rate of the pipeline.

[0047] like Figure 5 As shown, different numbers of LED chips 5 are transferred to the LED arrangement board 2. Since the flow rate of the fluid in the chamber 2 12 is related to the number of LED chips 5 that completely match the slots 6, the flow rate in the pipeline 1 41 can be detected by a flow detector to further determine the transfer completion rate of the LED chips 5.

[0048] In this embodiment, one end of the second pipe 42 is connected to the upper end of one side of the chamber 11, and the other end of the second pipe 42 is connected to the upper end of the other side of the chamber 11, so that the fluid in the upper part of the chamber 11 flows into the second pipe 42; one end of the third pipe 43 is connected to the lower end of one side of the chamber 11, and the other end of the third pipe 43 is connected to the lower end of the other side of the chamber 11, so that the fluid in the lower part of the chamber 11 flows into the third pipe 43. In this embodiment, the flow direction of the fluid in the second pipe 42 is opposite to the flow direction of the fluid in the third pipe 43. Figure 2 As shown, the fluid in the second pipe 42 is set to flow counterclockwise, and the fluid in the third pipe 43 is set to flow clockwise, so that the fluid in the chamber 11 can form a circular flow, as shown in FIG. Figure 7 As shown, when the LED chip 5 entering the groove is not forward, for example, the electrode of the LED chip is in contact with the bottom of the groove or the side of the LED chip is in contact with the bottom of the groove, the driving force of the pump on pipe 2 42 and the driving force of the pump on pipe 3 43 can be adjusted to increase the flow rate of the fluid in chamber 1, so that the LED chip 5 that does not completely match the groove 6 can be driven to break away from the groove 6, so that the LED chip 5 is transferred again and falls on the groove 6 with the circulation of the fluid until the LED chip 5 completely matches the groove 6.

[0049] like Figure 6 As shown, the forward entry of the LED chip 5 into the slot 6 is defined as the top of the LED chip 5 completely falling into the slot 6; in addition, the fluid in the pipe 1 41 is set to flow clockwise, so that the bottom plane of the chip is in close contact with the bottom of the slot, and no fluid on the slot flows into the pipe 1.

[0050] In this embodiment, filters (not shown in the figure) are provided at the connection between chamber 2 and pipe 1, and at the connection between chamber 1 and pipe 2 and pipe 3, so as to prevent the LED chips in the fluid chamber from flowing into the pipe along with the fluid.

[0051] like Figure 3 As shown, the length L1 of the LED chip 5, the length of the slot 6 is set to L2, the thickness of the LED chip 5 is set to W1, and the height of the slot 6 is set to W2. In this embodiment, the length L2 of the slot 6 is set to be 5% larger than the length L1 of the LED chip 5. At the same time, the thickness W1 of the LED chip 5 and the height W2 of the slot 6 have the following relationship:

[0052] ,

[0053] The height W2 of the slot 6 and the length L1 of the LED chip 5 have the following relationship:

[0054] ;

[0055] In this embodiment, the density of the LED chip 5 is greater than the density of the fluid in the fluid pool, which ensures that the LED chip 5 can sink toward the LED layout board 2. The outer wall of the fluid pool is made of transparent material to facilitate observation of the situation in the fluid pool.

[0056] like Figure 8 As shown, a LED transfer method further includes the following specific steps:

[0057] S0. The density of the fluid in the fluid pool of the preset LED transfer device is less than the density of the LED chip to be transferred; the flow speed of the fluid in the left and right directions and the up and down directions in chamber one is adjusted by adjusting the driving force of the pump on pipeline one, the pump on pipeline two and the pump on pipeline three on the LED transfer device, and the flow speed of the fluid in corresponding pipeline one, pipeline two and pipeline three when a preset LED chip in chamber one enters the LED layout board and the corresponding storage settings of the LED chip and the fluid density are recorded.

[0058] Step S0 specifically includes the following steps:

[0059] S01. After the fluid pool is filled with fluid, two or more LED chips are placed in a chamber of the fluid pool, and the pump on pipeline two, pipeline three, and pipeline one is started so that the fluid flow drives the LED chip to be transferred to the LED layout board;

[0060] S02. Confirm the flow of LED chips; if the number of LED chips entering the LED arrangement board meets a preset number, proceed to step S06; otherwise, proceed to steps S03-S05; if all the slots on the LED arrangement board have entered the LED chips, close the pumps on pipes 1, 2, and 3. In this embodiment, the flow of LED chips can be confirmed by observation by a tester, or the flow of LED chips in the current fluid pool can be obtained by a camera, and then the captured image is compared with a preset number, such as the number of LED chips falling on the LED arrangement board meeting a preset number. A preset number is, for example, the number of LED chips on the LED arrangement board is 80% of the number of slots. The flow rate of the current fluid can also be detected by a flow detector on pipe 1 to be 80% of the previous fluid flow rate. If the number of LED chips entering the LED arrangement board meets a preset number, it can be determined.

[0061] S03. If the LED chips do not move downward, increase the driving force of the pump on pipe one so that the flow rate of the fluid in pipes two and three is less than the flow rate of the fluid in pipe one; and proceed to step S02. In this embodiment, the fact that the LED chips do not move downward can be confirmed by observation by a tester, or by a camera device taking a photo to determine whether 60% of the LED chips are moving downward.

[0062] S04. If LED chips are accumulated, increase the driving force of the first pump so that the flow rate of the fluid in pipes two and three is greater than the flow rate of the fluid in pipe one, and proceed to step S02. In this embodiment, the accumulation of LED chips can be confirmed by observation by a tester, or by a camera device by taking a photo to determine whether 60% of the LED chips are in a single position.

[0063] S05. If a preset number of LED chips reversely enter the LED arrangement board, the driving force of the pump on pipeline three is increased, so that the LED chips reversely entering the LED arrangement board detach from the LED arrangement board and re-enter chamber one, and the process proceeds to step S02. In this embodiment, the reverse entry of the LED chips into the LED arrangement board can be confirmed by observation by a tester, or by a camera device taking a photo to determine whether the bottom or side of the LED chip contacts the bottom of the slot.

[0064] S06. Record the flow rate of the fluid in pipeline 2, pipeline 3, and pipeline 1. In this embodiment, the flow rate of the fluid in pipeline 2, pipeline 3, and pipeline 1 is measured by a flow detector.

[0065] S2. Determine the flow rate of the fluid on pipeline one, pipeline two and pipeline three according to the pre-stored LED chip size and fluid density, and determine the driving force of the pump on pipeline one, pipeline two and pipeline three according to the flow rate of the fluid on pipeline one, pipeline two and pipeline three to transfer the LED chip in chamber one to the LED layout board. In this embodiment, if the slots on the LED layout board have all entered the front of the LED chip, then close the pumps on pipeline one, pipeline two and pipeline three, and remove the LED layout board from the fluid pool to achieve the transfer of the LED chip.

[0066] The working principle of the present invention is as follows: by filling the fluid pool with fluid, the LED chip can be better driven to transfer through the fluid flow; the flow of fluid in the upper and lower directions of the fluid pool is realized by driving the pump on pipeline one, and the flow of fluid in the left and right directions of the fluid pool is realized by driving the pump on pipeline two and the pump on pipeline three; the fluid in chamber one can form a circulating flow, and the driving force of the pump on pipeline one, the pump on pipeline two and the pump on pipeline three can be adjusted according to the pre-tested flow rate of the fluid on pipeline one, pipeline two and pipeline three, so that when the LED chip is transferred to the LED arrangement board, it can operate at a more reliable fluid flow rate so that more LED chips can be transferred to the LED arrangement board, thereby realizing the transfer of a certain number of LED chips, and also ensuring the transfer efficiency and stability.

Claims

1. A method for transferring an LED chip to an LED layout board using an LED transfer device, characterized in that: The LED transfer device includes a fluid pool and pipe 1, pipe 2 and pipe 3, and a layout plate that can be detachably installed in the fluid pool. The LED layout plate is provided with two or more slots. The flow direction of the fluid in pipe 2 is opposite to the flow direction of the fluid in pipe 3. Chamber 1 and chamber 2 are provided inside the fluid pool. The LED layout plate is provided between chamber 1 and chamber 2 and separates chamber 1 from chamber 2. Slots and through holes matching the LED chips are provided on the LED layout plate. The slots are connected to the through holes. The two ends of pipe 1 are connected to chamber 1 and chamber 2 respectively. A pump is provided on pipe 1, one end of pipe 1 is connected to chamber 1, and the other end of pipe 1 is connected to chamber 2. A pump is provided on pipe 2, one end of pipe 2 is connected to the upper end of one side of chamber 1, and the other end of pipe 2 is connected to the upper end of the other side of chamber 1. A pump is provided on pipe 3, one end of pipe 3 is connected to the lower end of one side of chamber 1, and the other end of pipe 3 is connected to the lower end of the other side of chamber 1. The steps include: S0. The density of the fluid in the fluid pool of the LED transfer device is preset to be less than the density of the LED chip to be transferred; the flow rate of the fluid in the left-right and up-down directions within chamber 1 is adjusted by adjusting the driving force of the pumps on pipe 1, pipe 2, and pipe 3 on the LED transfer device, and the flow rate of the fluid in pipes 1, pipe 2, and pipe 3 corresponding to the LED chip and the fluid density corresponding to the LED chip in chamber 1 are recorded and stored when a preset LED chip enters the LED layout board; S2. Determine the flow rate of the fluid on pipeline one, pipeline two and pipeline three according to the pre-stored LED chip size and fluid density, and determine the driving force of the pump on pipeline one, pipeline two and pipeline three according to the flow rate of the fluid on pipeline one, pipeline two and pipeline three to transfer the LED chip in chamber one to the LED layout board.

2. The LED chip transfer method according to claim 1, wherein: Step S0 includes the following steps: S01. After the fluid pool is filled with fluid, two or more LED chips are placed in a chamber of the fluid pool, and the pump on pipeline two, pipeline three, and pipeline one is started so that the fluid flow drives the LED chip to be transferred to the LED layout board; S02 confirms the flow of LED chips; if the number of LED chips entering the LED arrangement board meets a preset number, proceeds to step S06; otherwise, proceeds to steps S03-S05; S03. If the LED chip does not move downward, increase the driving force of the pump on the pipeline so that the flow rate of the fluid in pipelines two and three is less than the flow rate of the fluid in pipeline one; proceed to step S02; S04. If the LED chips accumulate, increase the driving force of the first pump so that the flow rate of the fluid in pipes two and three is greater than the flow rate of the fluid in pipe one, and proceed to step S02; S05. If a preset number of LED chips enter the LED arrangement board in reverse, the driving force of the pump on the pipeline three is increased, so that the LED chips entering the LED arrangement board in reverse are separated from the LED arrangement board and re-enter the chamber one, and then step S02 is entered; S06. Record the flow rates of the fluids in pipeline 2, pipeline 3, and pipeline 1.

3. The LED chip transfer method according to claim 1, wherein: The density of the LED chips is greater than the density of the fluid in the fluid pool, and the number of the LED chips is 10 to 20 times the number of the slots provided on the LED layout plate.

4. The LED chip transfer method according to claim 1, wherein: Flow detectors are provided on pipeline one, pipeline two and pipeline three; step S0 also includes: adjusting the driving force of the pump on pipeline one, pipeline two and pipeline three on the LED transfer device to adjust the flow rate of the fluid in the left and right directions and the up and down directions in chamber one, and then recording the flow rate of the fluid in pipeline one, pipeline two and pipeline three corresponding to when a preset value of LED chip in chamber one enters the LED layout board through the flow detector.

5. The LED chip transfer method according to claim 1, wherein: The cross-sectional length of the chamber one is greater than the cross-sectional length of the chamber two, and the length of the LED arrangement plate matches the cross-sectional length of the chamber one.

6. The LED chip transfer method according to claim 1, wherein: There are more than two slots and they are spaced side by side on the LED arrangement board. The open end of the slot is connected to the first chamber, the bottom end of the slot is connected to one end of the through hole, and the other end of the through hole is connected to the second chamber.

7. The LED chip transfer method according to claim 1, wherein: The length L2 of the slot is 5% to 10% greater than the length L1 of the LED chip; the thickness of the LED chip is set to W1, and the height of the slot is set to W2. The following relationship exists between the thickness W1 of the LED chip and the height W2 of the slot: ， The following relationship exists between the slot height W2 and the LED chip length L1: 。 8. The LED chip transfer method according to claim 1, wherein: Filters are provided at the connection between chamber 2 and pipe 1, and at the connection between chamber 1 and pipe 2 and pipe 3.

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