Imaging system for bracket Mini-LED rubber surface defect detection

Through the bracket-like Mini-LED rubber-side defect detection imaging system, the method of combining multi-zone ring light source and backlight source is used to solve the problem of low detection accuracy in conventional detection methods, and the clear detection and high-precision detection of rubber-side defects are achieved.

CN222189139UActive Publication Date: 2024-12-17CHENGDU KOALA URAN TECH CO LTD
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Patent Information

Application Number
CN202420636526.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-29
Publication Date
2024-12-17
Estimated Expiration
2034-03-29

AI Technical Summary

Technical Problem

Among the existing Mini-LED rubber surface detection methods, conventional light source transmission rubber surface imaging detection methods have problems such as low detection accuracy and accuracy, and cannot clearly display defect characteristics such as glue surface flatness, fine droplets of glue or foreign objects and scratches.

Method used

Design a bracket-like Mini-LED rubber surface defect detection imaging system, adopting multi-zone ring light source time-sharing strobe lighting, combining backlight source and press leveling unit, obtaining normal vector information through surface reflected light imaging, and clearly displaying the rubber surface Status and surface information are provided, and detection accuracy is improved through the press leveling unit to reduce background interference.

Benefits of technology

It realizes clear detection of rubber surface defects, can detect extremely minor defects, overcomes the problems of insufficient imaging saturation and unclear boundaries, improves detection accuracy and accuracy, and is suitable for Mini-LED rubber surface detection.

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Patent Text Reader

Abstract

The utility model discloses an imaging system for bracket Mini-LED rubber surface defect detection. The imaging system comprises a detection camera, a conveying mechanism, a backlight mechanism, a multi-area annular light source, a jacking mechanism and a pressing and leveling unit, the conveying mechanism is used for conveying a to-be-tested Mini-LED board, and a conveying space is arranged in the middle of the conveying mechanism. A detection camera is arranged on the upper side or the lower side of the conveying mechanism, a multi-area annular light source is arranged on the peripheral side of the detection camera, a pressing and leveling unit is arranged between the detection camera and the conveying mechanism, and the jacking mechanism is used for lifting a to-be-detected Mini-LED plate and enabling the Mini-LED plate to be attached to the back side of the pressing and leveling unit. A detection cavity with a hollow structure is arranged in the middle of the pressing and leveling unit corresponding to a detection area of the Mini-LED board to be detected; a backlight mechanism is arranged on the back side of the to-be-tested Mini-LED board. The multi-zone annular light source time-sharing stroboscopic illumination is adopted, and the backlight mechanism and the pressing and leveling unit are combined, so that the interference of background information on rubber surface detection information is reduced or even eliminated, the texture state of the rubber surface can be fully restored, and the practicability is better.
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Description

Technical Field

[0001] The utility model belongs to the technical field of Mini-LED adhesive surface defect detection, and specifically relates to an imaging system for detecting adhesive surface defects of a bracket-type Mini-LED. Background Art

[0002] Mini-LED is a new type of LED display technology with the advantages of small size, high brightness, high contrast and fast response, and has broad application prospects in the field of electronic display. However, in the production process of Mini-LED, the glue surface defect after particle dispensing is a common and unavoidable problem, which seriously affects the display effect and quality of Mini-LED.

[0003] In the existing Mini LED visual inspection, the methods for detecting defects on the adhesive surface of Mini-LED particles mainly include manual visual inspection, microscope inspection, and the detection method of using conventional light sources to transmit the adhesive surface to form an image. However, when using the detection method of using conventional light sources to transmit the adhesive surface to form a reflected image on the bottom of the cup, the characteristics of the detected adhesive surface defects are not obvious, and the detection precision and accuracy are relatively low. In particular, the characteristics of the adhesive surface flatness, the characteristics of the high and low protrusions on the adhesive surface, and the characteristics of small drops of adhesive or foreign matter and scratches on the adhesive surface cannot be well displayed. Utility Model Content

[0004] The purpose of the utility model is to provide an imaging system for detecting defects on the adhesive surface of a bracket-type Mini-LED, aiming to solve the above-mentioned problems.

[0005] The utility model is mainly realized through the following technical solutions:

[0006] An imaging system for detecting defects on the adhesive surface of a bracket-type Mini-LED comprises a detection camera, a conveying mechanism, a backlight mechanism, a multi-zone annular light source, a lifting mechanism and a pressing and flattening unit; the conveying mechanism is used to convey a Mini-LED board to be tested, and a conveying space is provided in the middle; a detection camera is provided on the upper or lower side of the conveying mechanism, and a multi-zone annular light source is provided around the detection camera, a pressing and flattening unit is provided between the detection camera and the conveying mechanism, the lifting mechanism is used to lift the Mini-LED board to be tested and make it fit with the back side of the pressing and flattening unit, and a detection cavity with a hollow structure is provided in the middle of the pressing and flattening unit corresponding to the detection area of ​​the Mini-LED board to be tested; a backlight mechanism is provided on the back side of the Mini-LED board to be tested.

[0007] In order to better realize the utility model, further, the lifting mechanism includes a lifting mechanism and a receiving seat, the lifting mechanisms are respectively arranged on both sides of the conveying mechanism, and the receiving seats are respectively arranged on the opposite sides of adjacent lifting mechanisms, and the Mini-LED board to be tested is received between adjacent receiving seats.

[0008] In order to better realize the utility model, further, the jacking mechanism includes a lifting mechanism and a receiving platform, the receiving platform is arranged inside the conveying space, and the width of the receiving platform is smaller than the distance between adjacent conveying units, and lifting mechanisms are respectively arranged on both sides of the bottom of the receiving platform, and the middle part of the receiving platform is a hollow structure or a transparent structure.

[0009] In order to better realize the utility model, further, the conveying mechanism includes a frame and a conveying unit, a detection camera is arranged above the frame, and a pressure and flattening unit is installed on the top; a conveying space is opened in the middle of the frame, and conveying units are respectively and parallelly arranged on the frames on both sides of the conveying space, a Mini-LED board to be tested is placed between the tops of adjacent conveying units, and a receiving platform is arranged between adjacent conveying units.

[0010] In order to better realize the utility model, further, a plurality of stop blocks are arranged on the receiving platform.

[0011] In order to better realize the utility model, further, the backlight mechanism is fixedly installed inside the conveying space.

[0012] In order to better realize the utility model, further, it also includes a moving platform, a moving platform is arranged on one side of the conveying mechanism, and a backlight mechanism is arranged on the driving end of the moving platform for moving the backlight mechanism to the back side of the pressing and flattening unit.

[0013] In order to better realize the utility model, further, the pressing and flattening unit includes a frame, a detection cavity is opened in the middle of the frame, and a plurality of steel bars / steel wires are arranged inside the detection cavity along the length direction, and adjacent steel bars / steel wires are arranged at intervals.

[0014] In order to better realize the utility model, further, a plurality of holding blocks are respectively arranged on both sides of the detection cavity along the length direction, and a plurality of clamping grooves are correspondingly arranged on the side walls on both sides, steel bars / steel wires are fastened between the holding blocks and the clamping grooves, and steel bars / steel wires are arranged between adjacent holding blocks on both sides.

[0015] In order to better implement the utility model, further, a holding groove is provided at the bottom of the frame corresponding to the Mini-LED board to be tested.

[0016] The beneficial effects of the utility model are as follows:

[0017] (1) The utility model adopts multi-zone annular light source for time-sharing stroboscopic lighting, uses the light reflected from the surface to form an image, extracts gradient information from images in different light source irradiation directions and fuses the normal vector information to obtain the real information of the colloid surface, and can clearly display the state of the glue surface, the boundary between the glue surface and the glue frame, and other surface information, and fully restore various information on the surface. In addition, a backlight is added to the back of the sample to be tested, and the Mini-LED board to be tested is further flattened by a pressure-holding flattening unit to improve the flatness of each MiniLED particle on the Mini-LED board to be tested, reduce or even eliminate the interference of background information on the glue surface detection information, fully restore the texture state of the glue surface, detect extremely slight glue surface defects, and solve imaging problems such as insufficient imaging saturation, loss of glue surface information, and unclear boundaries. It can also overcome the influence of the color depth of the colloid itself on the imaging quality, and has good practicality;

[0018] (2) The utility model can avoid the lifting movement of the receiving platform through the flexible movement of the motion platform, and can flexibly adjust the area of ​​the backlight, which has good practicality;

[0019] (3) The structure of the pressing and flattening unit is convenient for disassembly and installation, and the size of the pressed hollow area can be flexibly adjusted according to the size of the detection area of ​​the Mini-LED board to be tested, which has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the back structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the connection structure between the frame and the pressing and leveling unit;

[0023] Figure 4 It is a schematic diagram of the working status of the pressing and leveling unit, the receiving platform and the backlight mechanism;

[0024] Figure 5 It is a schematic diagram of the connection structure between the backlight mechanism and the motion platform;

[0025] Figure 6 It is a structural schematic diagram of the pressing and leveling unit;

[0026] Figure 7 It is a schematic diagram of the pressing state of the pressing and flattening unit and the Mini-LED board to be tested;

[0027] Figure 8 It is a schematic diagram of the connection structure between the clamping groove and the steel bar / wire;

[0028] Fig. 9 It is a structural diagram of the motion platform.

[0029] Among them: 1-detection camera, 2-conveying mechanism, 3-backlight mechanism, 4-motion platform, 41-mounting seat, 42-linear guide rail, 5-lifting mechanism, 6-receiving platform, 7-pressing and leveling unit, 71-frame, 72-pressing block, 73-steel bar, 74-detection cavity, 75-clamping groove, 8-eight-zone ring light source, 9-frame, 10-Mini-LED board to be tested, 11-stop block. DETAILED DESCRIPTION

[0030] Embodiment 1:

[0031] An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED includes a detection camera 1, a conveying mechanism 2, a backlight mechanism 3, and a multi-zone annular light source; the conveying mechanism 2 is used to convey a Mini-LED board 10 to be tested, a conveying space is provided in the middle of the conveying mechanism 2 corresponding to the detection area of ​​the Mini-LED board 10 to be tested, and a backlight mechanism 3 is provided below the conveying space, the detection camera 1 is provided above the conveying mechanism 2 corresponding to the backlight mechanism 3, and a multi-zone annular light source is provided around the detection camera 1. Preferably, the multi-zone annular light source is an eight-zone annular light source 8.

[0032] Preferably, it also includes a lifting mechanism and a pressing and flattening unit 7. The pressing and flattening unit 7 is provided between the detection camera 1 and the conveying mechanism 2. The lifting mechanism is used to lift the Mini-LED board 10 to be tested and make it close to the pressing and flattening unit 7. The middle part of the pressing and flattening unit 7 is provided with a through detection cavity 74 corresponding to the detection area of ​​the Mini-LED board 10 to be tested. The utility model presses the Mini-LED board 10 to be tested on the back side of the pressing and flattening unit 7 through the lifting mechanism, and the detection area of ​​the Mini-LED board 10 to be tested is located in the detection cavity 74 for the detection camera 1 to shoot.

[0033] Furthermore, the lifting mechanism includes a lifting mechanism 5 and a receiving unit, one end of the lifting mechanism 5 is connected to the receiving unit, and is used to drive the receiving unit to receive the Mini-LED board 10 to be tested and make it close to the pressing and flattening unit 7. Specifically, the two sides of the conveying mechanism 2 can be respectively provided with lifting mechanisms 5, and the opposite sides of adjacent lifting mechanisms 5 are respectively provided with receiving seats for receiving the Mini-LED board 10 to be tested. The adjacent receiving seats cooperate to lift the Mini-LED board 10 to be tested to one side of the pressing and flattening unit 7, so that the conveying mechanism 2 can be used for non-stop defect detection.

[0034] Alternatively, further, the receiving platform 6 is arranged in the conveying space of the conveying mechanism 2 and is located on one side of the backlight mechanism 3. The bottom two sides of the receiving platform 6 can be respectively provided with lifting mechanisms 5, and the backlight mechanism 3 is arranged between adjacent lifting mechanisms 5. The size of the receiving platform 6 is smaller than the size of the conveying space, so that the receiving platform 6 can be driven to pass through the conveying space of the conveying mechanism 2 and receive the Mini-LED board 10 to be tested. The middle part of the receiving platform 6 is a hollow structure or a transparent structure. Further, a plurality of stop blocks 11 are arranged on one side of the receiving platform 6, which are used to receive and position the Mini-LED board 10 to be tested, so that the defect detection of the conveying mechanism 2 can be realized without stopping. Preferably, the conveying mechanism 2 can be an existing conveyor belt transmission mechanism, and the middle part of the conveyor belt can be provided with a conveying space corresponding to the detection area of ​​the Mini-LED board 10 to be tested, and the width of the conveying space is smaller than the placement width of the Mini-LED board 10 to be tested, and is larger than the width of the receiving platform 6.

[0035] Preferably, if Figure 7 and Figure 8 As shown, the interior of the detection cavity 74 is provided with a plurality of holding steel bars 73 / steel wires along the length direction, and adjacent steel bars 73 / steel wires are arranged at intervals to avoid the particles to be detected on the Mini-LED board 10 to be detected. Specifically, the holding and leveling unit 7 includes a frame 71, a holding block 72, a steel bar 73 / steel wire and a clamping groove 75. A detection cavity 74 is provided in the middle of the frame 71, and a plurality of holding blocks 72 are respectively arranged along the length direction on both sides of the detection cavity 74, and a plurality of clamping grooves 75 are correspondingly arranged on the side walls on both sides. A steel bar 73 / steel wire is fastened between the holding block 72 and the clamping groove 75, and a steel bar 73 / steel wire is arranged between adjacent holding blocks 72 on both sides. Furthermore, a holding groove is correspondingly arranged at the bottom of the frame 71.

[0036] During the use of the utility model, the conveying mechanism 2 conveys the Mini-LED board 10 to be tested to the detection position. At this time, the light of the backlight mechanism 3 shines on the back side of the Mini-LED board 10 to be tested through the conveying space of the conveying mechanism 2, and the multi-zone annular light source is used for time-sharing stroboscopic illumination. The detection camera 1 obtains the imaging scheme of the imaging pictures at multiple angles in time, and then performs image fusion to obtain the normal vector information, and then obtains the surface information of the Mini-LED particles to realize the Mini-LED glue surface defect detection. Preferably, the utility model can realize the flattening of the detection plane of the Mini-LED board 10 to be tested through the lifting mechanism and the pressure-holding flattening unit 7, improve the detection accuracy, and has good practicality.

[0037] Embodiment 2:

[0038] An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED, such as Figure 1 and Figure 2 As shown, it includes a detection camera 1, a conveying mechanism 2, a backlight mechanism 3, a motion platform 4, a material taking mechanism and a pressing and flattening unit 7; the detection camera 1 is arranged on the upper side or the lower side of the conveying mechanism 2, and a multi-zone annular light source is arranged around the detection camera 1, and a pressing and flattening unit 7 is arranged between the conveying mechanism 2 and the detection camera 1; a motion platform 4 is arranged on one side of the conveying mechanism 2, and a backlight mechanism 3 is arranged at the driving end of the motion platform 4, which is used to move the backlight mechanism 3 to the back side of the pressing and flattening unit 7; the material taking mechanism is used to take out the Mini-LED board 10 to be tested and make it fit with the back side of the pressing and flattening unit 7, and a through detection cavity 74 is arranged in the middle of the pressing and flattening unit 7 corresponding to the detection area of ​​the Mini-LED board 10 to be tested. Further, the multi-zone annular light source is an eight-zone annular light source 8.

[0039] Preferably, a plurality of steel bars 73 / steel wires are arranged inside the detection cavity 74 along the length direction, and adjacent steel bars 73 / steel wires are arranged at intervals. Further, the pressing and leveling unit 7 comprises a frame 71, a detection cavity 74 is provided in the middle of the frame 71, a plurality of pressing blocks 72 are arranged along the length direction on both sides of the detection cavity 74, and clamping grooves 75 are arranged on the side walls on both sides corresponding to the steel bars 73 / steel wires, a steel bar 73 / steel wire is arranged between the pressing block 72 and the clamping groove 75, and a steel bar 73 / steel wire is arranged between the pressing blocks 72 on both sides.

[0040] Preferably, the motion platform 4 is a linear drive mechanism, which can be a cylinder, oil cylinder, screw or other linear drive mechanism, which is the prior art and will not be described in detail. The material taking mechanism can be an existing manipulator, vacuum adsorption mechanism and lifting mechanism.

[0041] Preferably, the lifting mechanism includes a lifting mechanism 5 and a receiving unit, one end of the lifting mechanism 5 is connected to the receiving unit, and is used to drive the receiving unit to receive the Mini-LED board 10 to be tested and make it close to the pressing and flattening unit 7. Specifically, the receiving unit is a receiving seat, and the two sides of the conveying mechanism 2 can be respectively provided with lifting mechanisms 5, and the opposite sides of adjacent lifting mechanisms 5 are respectively provided with receiving seats for receiving the Mini-LED board 10 to be tested. The adjacent receiving seats cooperate to realize lifting the Mini-LED board 10 to be tested to one side of the pressing and flattening unit 7, so that the conveying mechanism 2 can be used for non-stopping defect detection.

[0042] Or, if Figure 3As shown, the receiving unit is a receiving platform 6, and the conveying mechanism 2 includes a frame 9 and a conveying unit. A conveying space is provided in the middle of the frame 9, and conveying units are provided in parallel on both sides of the frame 9. A Mini-LED board 10 to be tested is placed between the tops of adjacent conveying units. A lifting mechanism 5 is provided between adjacent conveying units, and the width of the receiving platform 6 is smaller than the distance between adjacent conveying units. A detection camera 1 is provided above the frame 9, and a pressure-holding and flattening unit 7 is installed on the top. The middle of the receiving platform 6 is a hollow structure or a transparent structure. Further, as Figure 6 As shown, a plurality of stop blocks 11 are provided on one side of the receiving platform 6 for receiving and positioning the Mini-LED board 10 to be tested, so that defect detection can be realized without stopping the conveying mechanism 2.

[0043] During use, the utility model transmits the Mini-LED board 10 to be tested through the conveying mechanism 2. When the Mini-LED board 10 to be tested moves to the test position, the material taking mechanism at the detection position moves the Mini-LED board 10 to the back side of the pressing and flattening unit 7, so that the pressing and flattening unit 7 flattens and presses the Mini-LED board 10 to be tested. Then, the motion platform 4 moves the backlight mechanism 3 to the bottom of the Mini-LED board 10 to be tested at this time, and the light of the backlight mechanism 3 is irradiated on the back side of the Mini-LED board 10 to be tested. The multi-zone annular light source is used for time-sharing stroboscopic illumination, and the detection camera 1 obtains the imaging scheme of imaging pictures at multiple angles in a time-sharing manner, and then performs image fusion to obtain normal vector information, and then obtains the surface information of the Mini-LED particles, so as to realize the Mini-LED glue surface defect detection.

[0044] Embodiment 3:

[0045] An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED, such as Figure 1-Figure 4 As shown, it includes a conveying mechanism 2, and a detection camera 1 is arranged above the conveying mechanism 2, and an eight-zone ring light source 8 is arranged around the detection camera 1. The conveying mechanism 2 includes a frame 9, and the middle part of the frame 9 is a conveying space. Conveying units are respectively and parallelly arranged on the frame 9 on both sides of the conveying space, and a Mini-LED board 10 to be tested is placed between the tops of adjacent conveying units. A transparent receiving platform 6 is arranged in the middle of the conveying space and below the Mini-LED board 10 to be tested, and lifting mechanisms 5 are respectively arranged at the two ends of the bottom of the receiving platform 6. A pressing and leveling unit 7 is arranged on the top of the frame 9 corresponding to the receiving platform 6, and the top side of the frame 9 is connected to the pressing and leveling unit 7 through a support column. As shown Figure 5As shown, a moving platform 4 is provided on one side of the frame 9, and the conveying direction of the conveying mechanism 2 is the X direction, and the driving direction of the moving platform 4 is the Y direction. A backlight mechanism 3 is provided on the moving platform 4, and the moving platform 4 is used to move the backlight mechanism 3 to the bottom of the receiving platform 6. Preferably, the receiving platform 6 is made of tempered glass.

[0046] like Figure 6-Figure 8 As shown, the pressing and leveling unit 7 includes a frame 71, a pressing block 72, a steel bar 73 / steel wire and a clamping groove 75. A detection cavity 74 is opened in the middle of the frame 71. A plurality of pressing blocks 72 are respectively arranged on both sides of the detection cavity 74 along the length direction, and a plurality of clamping grooves 75 are correspondingly arranged on the side walls on both sides. A steel bar 73 / steel wire is fastened between the pressing block 72 and the clamping groove 75, and a steel bar 73 / steel wire is arranged between the adjacent pressing blocks 72 on both sides.

[0047] like Fig. 9 As shown, the motion platform 4 includes a machine platform, a mounting seat 41, a linear guide rail 42 and a linear drive mechanism. The bottom of the mounting seat 41 is slidably connected to the machine platform through the linear guide rail 42. The linear drive mechanism is used to drive the mounting seat 41 to move linearly in the Y direction along the linear guide rail 42. The backlight mechanism 3 is installed on the top of the mounting seat 41.

[0048] During use of the utility model, the steel mesh pressure frame is fixed above the conveying space by columnar screws, and the steel mesh is used to stop and press the Mini-LED board 10 to be tested as the Z-axis detection position. Columnar lifting mechanisms 5 are fixed on both sides of the tempered glass plate. The lifting mechanisms 5 can be cylinders, and the tempered glass can be moved up and down by the cylinders. It is used to lift and press the Mini-LED board 10 to be tested to the lower surface of the steel mesh to flatten the Mini-LED board 10 to be tested. In addition, the tempered glass is used to allow the light of the backlight source to pass through, so that the light can penetrate into the hollow part of the Mini-LED board 10 to be tested. The backlight source is fixed on the mounting seat 41 of the Y-axis motion mechanism-motion platform 4. The mounting seat 41 is fixed on the sliders of two linear guide rails 42. The backlight source is moved along the Y-axis direction by the linear drive mechanism, which solves the interference problem when the Mini-LED board 10 to be tested is lifted from the conveying space to the detection position, and is used to avoid the lifting movement of the Mini-LED board 10 to be tested.

[0049] The utility model transports the Mini-LED board 10 to be tested to the bottom of the detection camera 1 through the transport units (conveyor belts or conveyor chains) on both sides of the frame 9, and then raises the receiving platform 6 through the lifting mechanism 5 to receive the Mini-LED board 10 to be tested and tightly attached to the detection cavity 74 of the pressing and flattening unit 7. At this time, the surface of the Mini-LED board 10 to be tested is limited and flattened by the steel bar 73 / steel wire. Finally, the backlight mechanism 3 is moved to the bottom of the receiving platform 6 through the motion platform 4, and the light of the backlight mechanism 3 passes through the receiving platform 6 and shines on the back side of the Mini-LED board 10 to be tested. The multi-zone annular light source is used for time-sharing strobe lighting, and the detection camera 1 obtains the imaging scheme of the imaging pictures at multiple angles in a time-sharing manner, and then performs image fusion to obtain the normal vector information, and then obtains the surface information of the Mini-LED particles, so as to realize the Mini-LED glue surface defect detection.

[0050] The utility model adopts 8-zone annular light source 8-time strobe lighting, adds a backlight source on the back of the Mini-LED board 10 to be tested, and uses a pressing and flattening unit 7 on the front to flatten the Mini-LED board 10 to be tested. The camera obtains the imaging scheme of imaging pictures under multiple angles in time, and then performs image fusion to obtain normal vector information, and then obtains the surface information of Mini-LED particles. It can highlight the various defect features of the glue surface and the flatness information of the glue surface. It has a good display of tiny glue drops, scratches, foreign matter and extremely slight excess or insufficient glue, and has good practicality.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED, characterized in that: The invention comprises a detection camera (1), a conveying mechanism (2), a backlight mechanism (3), a multi-zone annular light source, a lifting mechanism and a pressing and flattening unit (7); the conveying mechanism (2) is used to convey a Mini-LED board (10) to be tested, and a conveying space is arranged in the middle; a detection camera (1) is arranged on the upper side or the lower side of the conveying mechanism (2), and a multi-zone annular light source is arranged on the peripheral side of the detection camera (1); a pressing and flattening unit (7) is arranged between the detection camera (1) and the conveying mechanism (2); the lifting mechanism is used to lift the Mini-LED board (10) to be tested and make it fit with the back side of the pressing and flattening unit (7); a hollow detection cavity (74) is arranged in the middle of the pressing and flattening unit (7) corresponding to the detection area of ​​the Mini-LED board (10) to be tested; and a backlight mechanism (3) is arranged on the back side of the Mini-LED board (10) to be tested.

2. According to claim 1, an imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED is characterized in that: The lifting mechanism comprises a lifting mechanism (5) and a receiving seat, the lifting mechanisms (5) are respectively arranged on both sides of the conveying mechanism (2), and receiving seats are respectively arranged on opposite sides of adjacent lifting mechanisms (5), and the Mini-LED board (10) to be tested is received between adjacent receiving seats.

3. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 1, characterized in that: The lifting mechanism comprises a lifting mechanism (5) and a receiving platform (6); the receiving platform (6) is arranged inside the conveying space, and the width of the receiving platform (6) is smaller than the distance between adjacent conveying units; the lifting mechanisms (5) are respectively arranged on both sides of the bottom of the receiving platform (6); and the middle part of the receiving platform (6) is a hollow structure or a transparent structure.

4. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 3, characterized in that: The conveying mechanism (2) comprises a frame (9) and a conveying unit, wherein a detection camera (1) is arranged above the frame (9), and a pressing and flattening unit (7) is installed on the top; a conveying space is opened in the middle of the frame (9), and conveying units are arranged in parallel on the frame (9) on both sides of the conveying space, a Mini-LED board (10) to be tested is placed between the tops of adjacent conveying units, and a receiving platform (6) is arranged between adjacent conveying units.

5. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 3, characterized in that: A plurality of stop blocks (11) are arranged on the receiving platform (6).

6. An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to any one of claims 1 to 5, characterized in that: The backlight mechanism (3) is fixedly installed inside the conveying space.

7. An imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to any one of claims 1 to 5, characterized in that: It also comprises a moving platform (4), one side of the conveying mechanism (2) is provided with the moving platform (4), and the driving end of the moving platform (4) is provided with a backlight mechanism (3) for moving the backlight mechanism (3) to the back side of the pressing and flattening unit (7).

8. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 1, characterized in that: The pressing and leveling unit (7) comprises a frame (71), a detection cavity (74) is provided in the middle of the frame (71), a plurality of steel bars (73) / steel wires are arranged inside the detection cavity (74) along the length direction, and adjacent steel bars (73) / steel wires are arranged at intervals.

9. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 8, characterized in that: A plurality of holding blocks (72) are respectively arranged along the length direction on both sides of the detection cavity (74), and a plurality of clamping grooves (75) are correspondingly arranged on the side walls on both sides, a steel bar (73) / steel wire is fastened between the holding blocks (72) and the clamping grooves (75), and a steel bar (73) / steel wire is arranged between adjacent holding blocks (72) on both sides.

10. The imaging system for detecting defects on the adhesive surface of a stent-type Mini-LED according to claim 8, characterized in that: The bottom of the frame (71) is provided with a holding groove corresponding to the Mini-LED board (10) to be tested.