LED chip transfer device

Abstract

The utility model provides an LED chip transfer device, which comprises a fluid pool, an LED arrangement plate, a pump and pipelines, the pump is arranged on the pipeline, the pipeline comprises a pipeline I, a pipeline II and a pipeline III, a cavity I and a cavity II are arranged in the fluid pool, the LED arrangement plate is arranged between the cavity I and the cavity II and separates the cavity I from the cavity II, and the pipeline III is arranged in the fluid pool. The LED arrangement plate is provided with an open groove and a through hole which are matched with LED chips, the open groove is communicated with the first cavity, the through hole is communicated with the second cavity, the open groove is communicated with the through hole, the two ends of the first pipeline are connected with the first cavity and the second cavity respectively, the first pipeline is provided with a flow detector, the two ends of the second pipeline and the two ends of the third pipeline are connected with the two sides of the first cavity respectively, and the two ends of the third pipeline are connected with the two sides of the second cavity respectively. The LED chips are transferred to the LED arrangement plate through fluid backflow, the operation is simple, and the transfer efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of LED chip packaging, in particular to an LED chip transfer device. Background Art

[0002] LED chips, especially Mini / Micro LED, are widely used in display panels due to their small size. The production process mainly includes 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). The hourly production capacity is 45,000 according to the swing arm type. It takes nearly 590 hours to make a 4K screen. Such a transfer speed greatly limits the production capacity of Mini / Micro LED display panels.

[0003] To solve this technical problem, the Chinese patent application number is 202110254824.1, and the publication date is September 13, 2022. It discloses a chip transfer system. When the chip is transferred, the transfer substrate carrying the chip to be transferred can be directly placed in the first chamber. The chip is separated from the transfer substrate by controlling the first adsorption force generated by the corresponding first adsorption device through the adsorption control device. 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 the set position of the second chamber with the fluid. Then, through the control of the first adsorption force generated by the first adsorption device and the fluid, the chip can fall onto the corresponding chip bonding area on the target substrate, which greatly simplifies the chip transfer process, improves its transfer efficiency, and can well meet the needs of massive transfer of micro LED chips.

[0004] However, the above structure uses an adsorption device to move the chip to the position of the through hole, and then moves the chip from the first chamber to the corresponding position of the second chamber. In this process, it is difficult to control the adsorption device to adsorb the chip to the position of the through hole, which can easily cause the chip to shift. At the same time, the number of chips that can be transferred is affected by the setting of the adsorption device. When chips of other sizes need to be transferred, the transfer is unreliable due to the mismatch between the size of the adsorption device and the chip. In addition, only one chip can be transferred at a time, so the transfer efficiency is low. Utility Model Content

[0005] The utility model aims to provide an LED chip transfer device, which transfers LED chips to an LED arrangement board through fluid reflux, is easy to operate and can transfer LED chips in batches.

[0006] To achieve the above-mentioned purpose, the utility model provides an LED chip transfer device, including a fluid pool, an LED layout plate, a pump and a pipeline, the pump is arranged on the pipeline, the pipeline includes pipeline one, pipeline two and pipeline three, chamber one and chamber two are arranged inside the fluid pool, the LED layout plate is arranged between chamber one and chamber two and separates chamber one from chamber two, the LED layout plate is provided with more than two grooves matching the LED chip, one end of the groove is connected to chamber one, and the other end of the groove is connected to chamber two, the two ends of the pipeline one are respectively connected to chamber one and chamber two, the two ends of pipeline two and pipeline three are respectively connected to the two sides of chamber one, the flow direction of the fluid in pipeline two is opposite to the flow direction of the fluid on pipeline three, and the LED layout plate is detachably connected to the inner wall of the fluid pool.

[0007] The above arrangement is to set an LED arrangement board between chamber one and chamber two, and to set a groove on the LED arrangement board, and to make the groove connected to chamber one and the through hole connected to chamber two, so that the pump can drive pipe one to increase the power of the fluid in the fluid pool, so that when the fluid flows from chamber one through the groove into chamber two, it can drive the LED chip to be transferred to the groove; at the same time, the pump set on pipe two and pipe three drives the fluid in pipe two and pipe three to flow in opposite directions, so that the fluid in chamber one can form a circulating flow, so that the LED chip that does not completely match the groove can be taken away from the groove, so that the LED chip can be transferred to the groove again with the circulating flow of the fluid until the LED chip is completely matched with the groove, thereby ensuring that the LED chips are transferred to the LED arrangement board in batches, and then the LED arrangement board can be taken out, which is simple to operate.

[0008] Furthermore, the LED arrangement plate is provided with two or more through holes, the bottom of each slot is connected to a through hole, the other end of the through hole is connected to a pipe, and the opening size of the through hole is smaller than the width of the slot.

[0009] The above arrangement, by providing the through hole, enables the fluid to flow from the slot into the pipe one more effectively.

[0010] Furthermore, flow detectors are provided on pipeline one, pipeline two and pipeline three respectively.

[0011] The above arrangement detects the flow rate of the fluid on the pipeline one by setting a flow detector on the pipeline one, and when the flow rate of the fluid on the pipeline one is zero, it is determined that the LED arrangement board has been positively filled with LED chips.

[0012] 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.

[0013] The above arrangement enables the LED arrangement plate to be placed and fixed in chamber one.

[0014] Furthermore, the fluid pool is made of transparent material.

[0015] The above settings can facilitate viewing of the movement of the LED chip in the fluid pool.

[0016] Furthermore, a pump is provided on the pipeline one, one end of the pipeline one is connected to the chamber one, and the other end of the pipeline one is connected to the chamber two.

[0017] The above arrangement facilitates the pump to drive the fluid in pipeline 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.

[0018] Furthermore, a pump is provided on the pipeline 2, one end of which is connected to the upper end of one side of chamber 1, and the other end of which is connected to the upper end of the other side of chamber 1; a pump is provided on the pipeline 3, one end of which is connected to the lower end of one side of chamber 1, and the other end of which is connected to the lower end of the other side of chamber 1.

[0019] The above arrangement allows the fluid in the upper part of chamber one to flow into pipe two, and the fluid in the lower part of chamber one to flow into pipe three.

[0020] Furthermore, the length L2 of the slot is 5% to 10% greater than the length L1 of the LED chip.

[0021] The above arrangement facilitates the LED chip to be transferred into the groove under the drive of the fluid.

[0022] Furthermore, the thickness of the LED chip is set to W1, the height of the slot is set to W2, and the following relationship exists between the thickness W1 of the LED chip and the height W2 of the slot:

[0023] ,

[0024] There is the following relationship between the slot height W2 and the LED chip length L1:

[0025] .

[0026] The above arrangement facilitates the fluid in chamber 1 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.

[0027] 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.

[0028] The above arrangement can prevent the LED chips in the fluid chamber from flowing into the pipeline along with the fluid, while ensuring that the LED chips can fall into the LED arrangement plate through the flow of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is a schematic diagram of fluid flow in the utility model.

[0031] Figure 3 This is a schematic diagram of the LED chip and slotted structure in the utility model.

[0032] Figure 4 It is a schematic diagram of the LED chip being completely transferred to the LED layout board in the present invention.

[0033] Figure 5 It is a schematic diagram of the incomplete transfer of the LED chip to the LED layout board in the present invention.

[0034] Figure 6 This is a schematic diagram showing that the LED chip and the slot in the present invention are completely consistent.

[0035] Figure 7 This is a schematic diagram showing that the LED chip and the slot do not completely match in the present invention. DETAILED DESCRIPTION

[0036] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 1-7 As shown, the utility model provides an LED chip transfer device, including a fluid pool 1, an LED arrangement plate 2, a pump 3 and a pipeline, wherein the pump 3 is arranged on the pipeline, and the pipeline includes a pipeline 1 41, a pipeline 2 42 and a pipeline 3 43. In the present embodiment, the pipeline 1 41, the pipeline 2 42 and the pipeline 3 43 are all provided with a pump 3, so as to facilitate the flow of the fluid in the pipeline driven by the pump 3. The fluid pool 1 is provided with a chamber 11 and a chamber 2 12, and the cross-sectional length of the chamber 1 11 is greater than the cross-sectional length of the chamber 2 12. The LED arrangement plate 2 is arranged between the chamber 1 11 and the chamber 2 12 and separates the chamber 1 11 from the chamber 2 12. The length of the LED arrangement plate 2 matches the cross-sectional length of the chamber 1 11. The LED arrangement plate 2 is provided with more than two slots 6 matching the LED chip 5. The slots 6 are arranged side by side and spaced apart on the LED arrangement plate 2, and the slots 6 are connected and communicated with the through holes 7.

[0038] 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 41 is connected to the chamber 11, and the other end of the pipe 41 is connected to the chamber 2 12, and a flow detector 8 is provided on the other end of the pipe 41, so that the fluid in the pipe 41 is driven by the pump 3 to flow into the chamber 11, and then the fluid in the chamber 11 flows into the chamber 2 12 through the slot 6 and the through hole 7, thereby forming a circulating flow loop.

[0039] 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 the flow detector 8 to further determine the transfer completion rate of the LED chips 5. If the LED arrangement board 2 is positively covered with LED chips, the flow rate of the fluid detected by the flow detector 8 on the pipeline 1 is zero.

[0040] 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 circulating flow.

[0041] 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 the pipeline 2 42 and the driving force of the pump on the pipeline 3 43 can be adjusted to increase the flow rate of the fluid in the 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.

[0042] In this embodiment, filters (not shown in the figure) are provided at the connection between chamber 2 12 and pipe 1 41, and at the connection between chamber 1 11 and pipe 2 42 and pipe 3 43. When the size of the LED chip is less than 4*8, the flow rate of the fluid in pipe 1 41 does not exceed 10 cm / s, and the flow rate of the fluid in pipe 2 42 and pipe 3 43 does not exceed 20 cm / s. This can prevent the LED chip 5 in the fluid chamber from flowing into the pipe with the fluid, while ensuring that the LED chip 5 can fall onto the LED layout board 2 through the flow of the fluid. In addition, in this embodiment, the density of the fluid is greater than the density of the LED chip.

[0043] 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% greater than the length L1 of the LED chip 5, and there is the following relationship between the thickness W1 of the LED chip 5 and the height W2 of the slot 6:

[0044] ,

[0045] There is the following relationship between the height W2 of the slot 6 and the length L1 of the LED chip 5:

[0046] .

[0047] In this embodiment, the flow rate of the fluid on Pipe 1, Pipe 2 and Pipe 3 is obtained by implementing a calibration method. For example, by testing a preset number (for example, 80%) of LED chips on the LED layout board entering the slots and then recording the density of the LED chips, the fluid and the flow rate of the fluid in Pipe 1, Pipe 2 and Pipe 3 (the specific testing process is the prior art and will not be repeated here), and then the flow rate of the fluid is used for transfer during the actual transfer process, thereby ensuring that a certain number of LED chips can be transferred.

[0048] In addition, in this embodiment, the fluid pool is made of transparent materials such as transparent glass or transparent plastic, so that it is also possible to observe whether the LED chip in the fluid pool has entered the groove head-on and then determine whether the transfer of the LED chip has been completed. Since a step portion is formed between chamber one and chamber two, the LED layout board is clamped on the step portion to achieve a detachable connection.

[0049] The working principle of the utility model is as follows: by arranging an LED arrangement plate between chamber one and chamber two, and arranging a groove on the LED arrangement plate, and making the groove connected to chamber one, and the through hole connected to chamber two, the pump can be used to drive pipeline one to increase the power of the fluid in the fluid pool, so that when the fluid flows from chamber one through the groove into chamber two, the LED chip can be driven to transfer into the groove; at the same time, the pumps arranged on pipelines two and three drive the fluids in pipelines two and three to flow in opposite directions, so that the fluid in chamber one can form a circulating flow, so that the LED chip that does not completely match the groove can be taken away from the groove, so that the LED chip can be transferred to the groove again with the circulating flow of the fluid until the LED chip completely matches the groove, thereby ensuring that the LED chips are transferred to the LED arrangement plate in batches, and then the LED arrangement plate can be taken out, and the operation is simple.

Claims

1. An LED chip transfer device, characterized in that: It includes a fluid pool, an LED arrangement plate, a pump and a pipeline, the pump is arranged on the pipeline, the pipeline includes pipeline 1, pipeline 2 and pipeline 3, chamber 1 and chamber 2 are arranged inside the fluid pool, the LED arrangement plate is arranged between chamber 1 and chamber 2 and separates chamber 1 from chamber 2, the LED arrangement plate is provided with more than two grooves matching the LED chip, one end of the groove is connected to chamber 1, and the other end of the groove is connected to chamber 2, the two ends of pipeline 1 are respectively connected to chamber 1 and chamber 2, the two ends of pipeline 2 and pipeline 3 are respectively connected to the two sides of chamber 1, the flow direction of the fluid in pipeline 2 is opposite to the flow direction of the fluid on pipeline 3, and the LED arrangement plate is detachably connected to the inner wall of the fluid pool.

2. The LED chip transfer device according to claim 1, characterized in that: The LED arrangement plate is also provided with more than two through holes, the bottom of each slot is connected to a through hole, the other end of the through hole is connected to a pipe, and the opening size of the through hole is smaller than the width of the slot.

3. The LED chip transfer device according to claim 1, characterized in that: Flow detectors are respectively provided on pipeline one, pipeline two and pipeline three.

4. The LED chip transfer device according to claim 1, characterized in that: 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.

5. The LED chip transfer device according to claim 1, characterized in that: The fluid pool is made of transparent material.

6. The LED chip transfer device according to claim 1, characterized in that: A pump is arranged on the pipeline one, one end of the pipeline one is connected to the chamber one, and the other end of the pipeline one is connected to the chamber two.

7. The LED chip transfer device according to claim 1, characterized in that: A pump is provided on the pipeline 2, one end of which is connected to the upper end of one side of chamber 1, and the other end of which is connected to the upper end of the other side of chamber 1; a pump is provided on the pipeline 3, one end of which is connected to the lower end of one side of chamber 1, and the other end of which is connected to the lower end of the other side of chamber 1.

8. The LED chip transfer device according to claim 1, characterized in that: The length L2 of the slot is 5% to 10% greater than the length L1 of the LED chip.

9. The LED chip transfer device according to claim 1, characterized in that: The thickness of the LED chip is set to W1, and the height of the slot is set to W2. The thickness W1 of the LED chip and the height W2 of the slot have the following relationship: ， There is the following relationship between the slot height W2 and the LED chip length L1: 。 10. The LED chip transfer device according to claim 1, characterized in that: Filters are provided at the connection between chamber 2 and pipeline 1, and at the connection between chamber 1 and pipeline 2 and pipeline 3.

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