A flexible screen flaw detection device based on bending exposure

Abstract

The present application relates to the technical field of flexible screen detection, and specifically relates to a flexible screen flaw detection device based on bending exposure, which comprises a detection cabinet and a sliding frame, two groups of CCD camera modules for performing visual detection actions are symmetrically arranged on the sliding frame, two groups of electric clamps are connected with the inner wall of the detection cabinet through elastic extension rods, two groups of guide grooves are connected and a pressing position is formed at the connection of the two groups of guide grooves, a support roller group is arranged on both sides of the pressing position, a switching assembly is slid in the guide groove, two groups of mounting plates are arranged on the switching assembly, a plurality of groups of cylindrical rollers with different diameters are circumferentially and equidistantly arranged on each mounting plate, when the mounting plate is switched to the pressing position by the switching assembly, the cylindrical rollers can be matched with the support roller group to bend the flexible screen, and a locking assembly is connected with the mounting plate and the detection cabinet, the locking assembly can rotate the mounting plate by a predetermined angle and lock it when the sliding frame performs one reciprocating action, so that rapid and comprehensive detection is realized.

Description

Technical Field

[0001] This invention relates to the field of flexible screen inspection technology, specifically a defect detection device for flexible screens based on bending exposure. Background Technology

[0002] Flexible displays, with their bendability, lightweight, and impact resistance, have become a mainstream development direction in fields such as smartphones and wearable devices. However, the multi-layer thin-film structure of flexible screens is prone to potential defects such as microcracks, delamination, and circuit breaks during manufacturing and use. Furthermore, to achieve comprehensive quality control, both the front and back of the screen must be inspected.

[0003] Currently, existing bending exposure testing equipment typically applies controllable bending stress to flexible screens using a three-roller setup. This method achieves a preset curvature by using the relative movement of the central bending roller and the two side guide rollers. However, after image acquisition on one side of the screen, the traditional approach requires a 180° spatial rotation of the entire flexible screen to change the observation orientation of the inner and outer sides in order to inspect the other side. This rotation process is particularly problematic when dealing with longer flexible screens, as the large screen length necessitates a large safety envelope for rotational movement, resulting in a bulky overall equipment size, significant space waste, and increased costs.

[0004] To reduce equipment footprint, some improvements attempt to bring the two ends of the screen closer together after testing, relaxing the screen before rotation. While this reduces the rotation radius, the flexible screen, in its relaxed state, loses its tension constraint in the central area, resulting in uncontrollable free-falling or bending. During subsequent rotation, this uncontrollable section of the screen is highly susceptible to accidental interference and collisions with nearby bending rollers, sensor bases, or the equipment housing, causing secondary scratches on the screen surface, film creases, and even damage to internal circuitry. This not only damages the tested sample but also severely interferes with the accuracy of the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible screen defect detection device based on bending exposure, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A defect detection device for flexible screens based on bending exposure, comprising:

[0008] The testing cabinet is equipped with a sliding frame that can move laterally back and forth inside the testing cabinet, and two sets of CCD camera modules are symmetrically arranged on the sliding frame;

[0009] Two sets of electric clamps are connected to the inner wall of the testing cabinet via elastic telescopic rods;

[0010] Two sets of guide grooves are provided and formed on the sliding frame. The two sets of guide grooves are connected, and a pressure position is formed at the connection of the two sets of guide grooves.

[0011] Two sets of support rollers are provided and are located on both sides of the pressure application position;

[0012] The switching component slides within the guide groove. The switching component is equipped with two sets of mounting plates. Each set of mounting plates is circumferentially and equidistantly equipped with multiple sets of cylindrical rollers of different diameters. When the switching component drives the mounting plate to switch to the pressure position, the cylindrical rollers can cooperate with the support roller set to make the flexible screen bend.

[0013] A locking assembly connects the mounting plate and the testing cabinet. The locking assembly can rotate the mounting plate by a predetermined angle and lock it when the sliding frame performs one reciprocating motion.

[0014] The flexible screen defect detection device based on bending exposure as described above: the guide groove includes a first inclined groove and a first horizontal groove disposed on the sliding frame, the first inclined groove and the first horizontal groove being in communication;

[0015] The pressure application point is located at the end of the first inclined groove that is away from the first horizontal groove.

[0016] The flexible screen defect detection device based on bending exposure as described above: the switching component includes two sets of track members slidably installed in two sets of guide slots, and the two sets of track members are connected by a pull rod;

[0017] The inspection component is rotatably connected to the mounting plate;

[0018] The switching assembly also includes a traction structure connected to one of the sets of track inspection components.

[0019] The flexible screen defect detection device based on bending exposure as described above: the traction structure includes a first pneumatic drive structure fixedly installed on the sliding frame and a transverse component connected to the first pneumatic drive structure, the transverse component being provided with a hysteresis groove along its length direction;

[0020] The traction structure also includes a first convex shaft rotatably connected to the track inspection component, the first convex shaft being able to roll within the hysteresis groove.

[0021] The flexible screen defect detection device based on bending exposure as described above: the locking component includes:

[0022] A toothed belt connects the rotating shafts of the two sets of mounting plates;

[0023] The follower disk is coaxially and fixedly connected to the rotating shaft of the mounting plate, and the follower disk is provided with multiple sets of Y-shaped grooves;

[0024] The connecting plate is rotatably connected to the mounting plate via a rotating shaft. The connecting plate is connected to the sliding frame via a guide structure, which enables the connecting plate to remain vertical.

[0025] An elastic structure is provided on the connecting plate, and a locking wheel adapted to the Y-shaped groove is provided on one side of the elastic structure;

[0026] A triggering structure is installed inside the detection cabinet. The triggering structure cooperates with the elastic structure to enable the locking wheel to first separate from the Y-shaped groove, and then drive the mounting plate to rotate.

[0027] The flexible screen defect detection device based on bending exposure as described above: the guide structure includes a fitting shaft rotatably mounted on the connecting plate and a guide groove disposed on the sliding frame, the guide groove being parallel to the guide groove located at the upper part;

[0028] The guide groove includes a second inclined groove and a second horizontal groove.

[0029] The flexible screen defect detection device based on bending exposure as described above: the elastic structure includes a slider that can slide along the length direction of the connecting plate, the slider is slidably connected to a vertical shaft disposed on the connecting plate, a cylindrical spring is sleeved on the vertical shaft, one end of the cylindrical spring is connected to the connecting plate, and the other end is connected to the slider;

[0030] The locking wheel is rotatably mounted on the slider.

[0031] The flexible screen defect detection device based on bending exposure as described above: the triggering structure includes a side plate installed on the detection cabinet, a lifting plate slidably installed on the side plate, a parallel guide provided on the lifting plate, and the parallel guide being adapted to a second convex shaft installed on the slider;

[0032] The triggering structure also includes an abutment deflection plate rotatably connected to the side plate. A torsion spring is provided on the rotating shaft of the abutment deflection plate, and a right-angle abutment part is provided at the rotating shaft of the abutment deflection plate.

[0033] The abutting deflection plate cooperates with the cylindrical roller to drive the mounting plate to rotate.

[0034] The flexible screen defect detection device based on bending exposure as described above: the support roller group includes a second pneumatic drive structure fixedly installed on the sliding frame. The second pneumatic drive structure has two actuating ends, and two sets of support rollers are rotatably installed on each of the two actuating ends.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] First, the automatic alternation between the upper and lower mounting plates and cylindrical rollers in the pressure position and the avoidance position is realized, thereby completing the automatic conversion between the two detection states of upward bending and downward bending of the flexible screen, meeting the requirements of double-sided inspection. Second, through the staggered arrangement design, it is ensured that when performing bending detection in any direction, the non-working cylindrical rollers completely avoid the shooting field of the CCD camera module, solving the problem of roller groups obstructing the camera's field of view in traditional equipment, and ensuring the integrity of image acquisition and detection accuracy. In addition, the guide structure of the track-walking component and the inclined groove and horizontal groove, combined with the linkage transmission of the pull rod, realizes the synchronous reverse movement of the two sets of mounting plates, and the repositioning action is smooth and reliable with high positioning accuracy. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a flexible screen defect detection device based on bending exposure.

[0038] Figure 2 This is a schematic diagram of the structure after the cabinet is removed in a flexible screen defect detection device based on bending exposure.

[0039] Figure 3 This is a schematic diagram of the planar structure of the sliding frame in a flexible screen defect detection device based on bending exposure.

[0040] Figure 4 This is a schematic diagram of the switching component in a flexible screen defect detection device based on bending exposure.

[0041] Figure 5 This is a schematic diagram of the switching component at another angle in a flexible screen defect detection device based on bending exposure.

[0042] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle.

[0043] Figure 7 This is an exploded view of the locking component in a flexible screen defect detection device based on bending exposure.

[0044] Figure 8 This is a schematic diagram of the elastic structure and triggering structure in a flexible screen defect detection device based on bending exposure.

[0045] Figure 9 This is an exploded view of the trigger structure in a flexible screen defect detection device based on bending exposure.

[0046] Figure 10 This is a schematic diagram of the support roller assembly in a flexible screen defect detection device based on bending exposure.

[0047] Figure 11 This is a schematic diagram of the flexible screen bending in different directions in a flexible screen defect detection device based on bending exposure.

[0048] In the diagram: 1. Inspection cabinet; 2. Sliding frame; 201. First inclined groove; 202. First horizontal groove; 203. Second inclined groove; 204. Second horizontal groove; 3. Track inspection component; 301. First convex shaft; 4. Pull rod; 5. Mounting plate; 6. Toothed belt; 7. Columnar roller; 8. Transverse component; 9. First pneumatic drive structure; 10. Connecting plate; 11. Slider; 12. Second convex shaft; 13. Vertical shaft; 14. Columnar spring; 15. Fitting shaft; 16. Locking wheel; 17. Follower plate; 1701. Y-shaped groove; 18. Side plate; 19. Lifting plate; 20. Parallel guide component; 21. Abutment deflection plate; 2101. Right angle abutment part; 22. Support roller; 23. Second pneumatic drive structure; 24. Electric clamp; 25. Elastic telescopic rod; 26. CCD camera module. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] Please see Figures 1-11 As an embodiment of the present invention, the flexible screen defect detection equipment based on bending exposure includes: a detection cabinet 1, an electric clamp 24, a guide groove, a support roller group, a switching component and a locking component.

[0051] The testing cabinet 1 is equipped with a sliding frame 2 that can move laterally back and forth inside it. The testing cabinet 1 is also equipped with a linear drive module that can drive the sliding frame 2 to move horizontally. Two sets of CCD camera modules 26 are symmetrically arranged on the sliding frame 2. The two sets of CCD camera modules 26 work alternately during operation. When the flexible screen is bent upward, the upper CCD camera module 26 is in operation to capture images of the bending position of the flexible screen. When the flexible screen is bent downward, the lower CCD camera module 26 is in operation.

[0052] Two sets of electric clamps 24 are provided, each connected to the inner wall of the testing cabinet 1 via elastic telescopic rods 25, thereby achieving flexible support and adaptive tension adjustment at both ends of the flexible screen. Specifically, the electric clamps 24 are equipped with two sets of relatively movable clamping plates for clamping the ends of the flexible screen. In the initial state, the two sets of electric clamps 24 are positioned far apart under the elastic pull of the elastic telescopic rods 25, leaving sufficient space for placing the flexible screen. When the two ends of the flexible screen are placed between the two sets of clamping plates of the two sets of electric clamps 24, the clamping plates move closer together under electric drive and clamp the ends of the screen, completing the clamping and fixing of the flexible screen.

[0053] During the testing process, when the flexible screen is bent and folded to a specific shape, the screen tends to tighten due to the bending. At this time, the elastic telescopic rods 25 on both sides can adaptively release or absorb elastic potential energy according to the degree of bending, playing a dynamic buffering role. This ensures that the flexible screen is always maintained within the predetermined tension range, avoiding damage to the screen due to excessive tension and preventing uncontrollable deformation due to relaxation, which could lead to accidental interference and collision with nearby bending rollers, sensor bases, or equipment housings, effectively avoiding the risk of secondary damage.

[0054] Please see Figures 3-5 The guide groove is provided in two sets and is opened on the sliding frame 2. The two sets of guide grooves are connected and a pressure position is formed at the connection of the two sets of guide grooves. The guide groove includes a first inclined groove 201 and a first horizontal groove 202 provided on the sliding frame 2. The first inclined groove 201 and the first horizontal groove 202 are connected.

[0055] The pressure application position is located at the end of the first inclined groove 201 that is away from the first horizontal groove 202.

[0056] The switching component slides within the guide groove. The switching component is provided with two sets of mounting plates 5. Each set of mounting plates 5 is circumferentially and equidistantly mounted with multiple sets of cylindrical rollers 7 of different diameters. When the switching component drives the mounting plate 5 to switch to the pressure position, the cylindrical rollers 7 can cooperate with the support roller group to make the flexible screen bend.

[0057] The switching assembly includes two sets of track-following components 3 slidably installed in the two sets of guide grooves. The two sets of track-following components 3 are connected by a pull rod 4. Each track-following component 3 is provided with two sets of rollers, which can roll within the guide grooves.

[0058] The patrol component 3 is rotatably connected to the mounting plate 5;

[0059] The switching assembly also includes a traction structure connected to one of the track inspection components 3. The traction structure includes a first pneumatic drive structure 9 fixedly installed on the sliding frame 2 and a transverse component 8 connected to the first pneumatic drive structure 9. The transverse component 8 is provided with a hysteresis groove along its length.

[0060] The traction structure also includes a first convex shaft 301 rotatably connected to the track inspection component 3, the first convex shaft 301 being able to roll within the hysteresis groove.

[0061] To facilitate understanding of the technical solution of this embodiment, the following description takes the flexible screen in its initial upward bending state as an example. In this state, the mounting plate 5 located below is in the pressure position, and the cylindrical roller 7 provided on the mounting plate 5 cooperates with the support roller group to apply an upward bending force to the flexible screen (see reference). Figure 11 (Upper state diagram). Meanwhile, the upper mounting plate 5 is positioned at the end of the first horizontal groove 202 furthest from the first inclined groove 201, i.e., in a clearance position. At this time, the upper and lower mounting plates 5 are staggered. When the upper CCD camera module 26 acquires images of the flexible screen, the upper mounting plate 5 in the clearance position and its cylindrical roller 7 completely exit the camera module's field of view, ensuring unobstructed image acquisition and guaranteeing the integrity and clarity of the detected images.

[0062] When the sliding frame 2 moves to the end of its stroke along the length of the flexible screen, the control system triggers a reversing action. At this time, the first pneumatic drive structure 9 drives the transverse component 8 to move, which in turn causes the first convex shaft 301 to engage with the hysteresis groove on the track-tracing component 3. This causes the track-tracing component 3, which was originally in the pressure application position, to slide along the lower first inclined groove 201 and the first horizontal groove 202. Since the two sets of track-tracing components 3 are linked together by the pull rod 4, when one set of track-tracing components 3 moves to the end of the lower first horizontal groove 202 away from the first inclined groove 201, the other set of track-tracing components 3 and its corresponding mounting plate 5 are simultaneously pulled to the pressure application position.

[0063] After the repositioning is completed, the upper mounting plate 5, which was originally in the avoidance position, moves to the pressure position. Its cylindrical roller 7 cooperates with the support roller group, causing the flexible screen to switch to a downward bending state. At this time, the lower mounting plate 5, which was originally in the pressure position, moves to the avoidance position, forming a new staggered arrangement with the upper mounting plate 5 currently in the pressure position. This ensures that when the lower CCD camera module 26 captures images of the flexible screen, the lower mounting plate 5 and its cylindrical roller 7, which were in the avoidance position, are completely out of the shooting field of view, guaranteeing unobstructed image acquisition in the downward bending state.

[0064] Based on the above settings, firstly, the automatic alternation between the upper and lower sets of mounting plates 5 and cylindrical rollers 7 in the pressure position and the avoidance position is realized, thereby completing the automatic conversion between the two detection states of upward bending and downward bending of the flexible screen, meeting the requirements of double-sided detection; secondly, through the staggered arrangement design, it is ensured that when performing bending detection in any direction, the non-working cylindrical rollers 7 completely avoid the shooting field of the CCD camera module 26, solving the problem of roller groups obstructing the camera field of view in traditional equipment, and ensuring the integrity of image acquisition and detection accuracy; in addition, the guide structure of the track-tracing component 3 cooperating with the inclined groove and the horizontal groove, combined with the linkage transmission of the pull rod 4, realizes the synchronous reverse movement of the two sets of mounting plates 5, the switching action is smooth and reliable, and the positioning accuracy is high.

[0065] Please see Figure 2 , Figure 10 The support roller assembly is provided in two sets and is located on both sides of the pressure application position. The support roller assembly includes a second pneumatic drive structure 23 fixedly installed on the sliding frame 2. The second pneumatic drive structure 23 has two actuating ends, and two sets of support rollers 22 are rotatably installed on each of the two actuating ends.

[0066] In this embodiment, the loading process of the flexible screen is as follows: the flexible screen is passed between two sets of support rollers 22. When the upper mounting plate 5 moves downward, its cylindrical roller 7 cooperates with the two sets of support rollers 22 located at the lower part of the flexible screen, working together to bend the flexible screen downward; when the lower mounting plate 5 moves upward, its cylindrical roller 7 cooperates with the two sets of support rollers 22 located at the upper part of the flexible screen, bending the flexible screen upward. Through the alternating movement of the upper and lower sets of mounting plates 5, the bending direction of the flexible screen is switched, thereby meeting the requirements of double-sided inspection, that is, image acquisition is performed on the inner and outer surfaces of the flexible screen in the upward and downward bending states respectively, comprehensively exposing different types of potential defects.

[0067] To ensure that various defects are fully exposed during bending, the flexible screen needs to be bent at different angles during inspection. This is achieved by using cylindrical rollers 7 of different diameters in conjunction with support rollers 22: the flexible screen is wrapped around cylindrical rollers 7 of different diameters, thus obtaining different bending radii. However, with the positions of the two sets of support rollers 22 fixed, changing to cylindrical rollers 7 of different diameters will cause the wrap angle formed by the flexible screen on the cylindrical rollers 7 to change. The wrap angle mentioned here refers to the angle formed by the lines connecting the two ends of the flexible screen wrapped around the cylindrical roller 7 to the center of the cylindrical roller 7. Specifically, when switching to a cylindrical roller 7 with a smaller diameter, the wrap angle will decrease accordingly; conversely, when switching to a cylindrical roller 7 with a larger diameter, the wrap angle will increase.

[0068] Changes in the wrap angle directly affect the imaging quality of the visual inspection system. An increased wrap angle means a greater curvature of the screen surface in the camera's field of view, leading to increased image distortion. This increases the difficulty of surface flattening in image processing algorithms, potentially introducing measurement errors and reducing the reliability and consistency of the detection results. To address this issue, in this embodiment, when the flexible screen switches to a large-angle bending (i.e., using a large-diameter cylindrical roller 7 in conjunction with the support roller 22), the second pneumatic drive structure 23 synchronously drives the support rollers 22 at both ends to move away from each other. By increasing the distance between the two sets of support rollers 22, the wrapping shape of the flexible screen on the cylindrical roller 7 changes, thereby controlling the wrap angle within a preset constant range.

[0069] Based on the above settings, firstly, by adjusting the spacing of the support rollers 22, the fluctuation of the wrap angle caused by the change in the diameter of the cylindrical roller 7 is eliminated, ensuring that the detection under different bending radii is carried out under similar wrap angle conditions, thus guaranteeing the consistency of the optical path of the visual imaging system; secondly, a constant wrap angle means that the bending shape of the screen surface in the camera's field of view remains basically unchanged, keeping the image distortion model stable, and the image processing algorithm can use uniform calibration parameters for surface flattening, significantly reducing the algorithm complexity and improving the accuracy and efficiency of image processing; in addition, since the wrap angle is controlled within the optimal observation range, the CCD camera module 26 can always acquire images of the screen surface at an angle close to orthogonal, avoiding edge distortion and brightness attenuation caused by an excessively large wrap angle, thus ensuring the accuracy of defect identification.

[0070] Please see Figure 2 , Figures 6-9 The locking assembly connects the mounting plate 5 and the detection cabinet 1. The locking assembly can rotate the mounting plate 5 by a predetermined angle and lock it when the sliding frame 2 performs a reciprocating motion. The locking assembly includes: toothed belt 6, follower plate 17, connecting plate 10, elastic structure and triggering structure.

[0071] The toothed belt 6 connects the rotating shafts of the two sets of mounting plates 5. By connecting the two sets of mounting plates 5 through the toothed belt 6, the synchronous rotation of the two sets of mounting plates 5 can be achieved, so that the cylindrical rollers 7 on the two sets of mounting plates 5 that cooperate with the support roller group can be switched to the predetermined position synchronously. This allows the sliding frame 2 to bend the flexible screen to the predetermined angle when performing one reciprocating motion, making the bending angle more uniform.

[0072] The follower disk 17 is coaxially and fixedly connected to the rotating shaft of the mounting plate 5. The follower disk 17 is provided with multiple sets of Y-shaped grooves 1701. Specifically, the Y-shaped groove 1701 includes a U-shaped surface provided on the follower disk 17 and an inclined guide surface connected to the end of the U-shaped surface.

[0073] The connecting plate 10 is rotatably connected to the mounting plate 5 via a rotating shaft. The connecting plate 10 is connected to the sliding frame 2 via a guide structure, which enables the connecting plate 10 to remain in a vertical state.

[0074] The guide structure includes a fitting shaft 15 rotatably mounted on the connecting plate 10 and a guide groove provided on the sliding frame 2, the guide groove being parallel to the guide groove located at the upper part;

[0075] The guide groove includes a second inclined groove 203 and a second horizontal groove 204.

[0076] In this embodiment, the second inclined groove 203 is arranged parallel to the first inclined groove 201, and the second horizontal groove 204 is arranged parallel to the first horizontal groove 202. This ensures that when the mounting plate 5 changes position, the mating shaft 15 remains engaged with the guide groove, thus keeping the connecting plate 10 vertical during movement. The vertical orientation of the connecting plate 10 is a prerequisite for the accurate execution of subsequent locking actions. That is, only when the connecting plate 10 is in a vertical state can the elastic structure mounted on the connecting plate 10 engage with the follower plate 17 at the correct angle to achieve precise locking of the rotating shaft of the mounting plate 5.

[0077] Thanks to the constant orientation of the connecting plate 10, when the track-tracing component 3 moves along the first inclined groove 201 and the first horizontal groove 202 and changes its orientation, the rotating shaft of the mounting plate 5 remains locked and will not rotate unexpectedly. This means that no matter whether the mounting plate 5 moves to the pressure position or the avoidance position, the orientation of the cylindrical roller 7 on it relative to the support roller group remains unchanged, thereby ensuring that the cylindrical roller 7 of the corresponding diameter can accurately and stably cooperate with the support roller group to apply bending stress in a predetermined direction to the flexible screen.

[0078] Please refer to it again. Figure 2 , Figures 6-9 The elastic structure is disposed on the connecting plate 10. A locking wheel 16 adapted to the Y-shaped groove 1701 is disposed on one side of the elastic structure. The elastic structure includes a slider 11 that can slide along the length direction of the connecting plate 10. The slider 11 is slidably connected to a vertical shaft 13 disposed on the connecting plate 10. A columnar spring 14 is sleeved on the vertical shaft 13. One end of the columnar spring 14 is connected to the connecting plate 10, and the other end is connected to the slider 11.

[0079] The locking wheel 16 is rotatably mounted on the slider 11;

[0080] The triggering structure is installed inside the detection cabinet 1. The triggering structure cooperates with the elastic structure to enable the locking wheel 16 to first separate from the Y-shaped groove 1701 and then drive the mounting plate 5 to rotate.

[0081] The triggering structure includes a side plate 18 installed on the detection cabinet 1, a lifting plate 19 slidably installed on the side plate 18, a parallel guide 20 provided on the lifting plate 19, and the parallel guide 20 being adapted to the second convex shaft 12 installed on the slider 11.

[0082] The triggering structure also includes an abutment deflection plate 21 rotatably connected to the side plate 18. A torsion spring is provided on the rotating shaft of the abutment deflection plate 21, and a right-angle abutment part 2101 is provided at the rotating shaft of the abutment deflection plate 21.

[0083] The abutting deflection plate 21 cooperates with the cylindrical roller 7 to drive the mounting plate 5 to rotate.

[0084] In this embodiment, in the initial state, the locking wheel 16 is embedded inside the U-shaped surface of the follower disk 17, so that the follower disk 17 is in a locked state. In this state, when the two sets of mounting plates 5 switch positions, the cylindrical rollers 7 of the corresponding diameter on the mounting plate 5 can stably and accurately maintain the cooperation relationship with the support roller group, thereby realizing the bending detection of the flexible screen in different directions.

[0085] When the sliding frame 2 performs one reciprocating motion and returns to the end of its stroke, the second convex shaft 12 abuts against the inclined surface of the parallel guide 20 away from the side plate 18, and moves upward under the guidance of this inclined surface. This motion drives the slider 11 and the locking wheel 16 to rise synchronously, compressing the cylindrical spring 14. At the same time, the locking wheel 16 separates from the U-shaped surface, and the locking state of the rotating shaft of the mounting plate 5 is released. As the sliding frame 2 continues to move, the second convex shaft 12 slides along the upper surface of the parallel guide 20. At this time, the abutting deflection plate 21 abuts against the cylindrical roller 7 on the upper mounting plate 5, pushing the mounting plate 5 to rotate, realizing the position switching of the cylindrical roller 7. The sliding frame 2 continues to move until the second convex shaft 12 separates from the upper surface of the parallel guide 20. At this time, the locking wheel 16, under the reset action of the cylindrical spring 14, re-inserts into the corresponding Y-shaped groove 1701 on the follower plate 17, so that the rotating shaft of the mounting plate 5 is locked again. Subsequently, the sliding frame 2 moves in the opposite direction, and the second convex shaft 12 cooperates with another set of inclined surfaces on the parallel guide 20 to push the parallel guide 20 to move upward. This can prevent the locking wheel 16 from accidentally separating from the Y-shaped groove 1701 when the sliding frame 2 moves in the opposite direction, and significantly improve the stability of the mounting plate 5 after rotation locking.

[0086] During the movement of the mounting plate 5 toward the abutting deflector plate 21, the right-angle abutting portion 2101 on the abutting deflector plate 21 is in contact with the side plate 18, allowing the abutting deflector plate 21 to stably push the mounting plate 5 to rotate by acting on the cylindrical rollers 7. When the mounting plate 5 moves away from the abutting deflector plate 21, one set of cylindrical rollers 7 moves to the side of the abutting deflector plate 21 facing the side plate 18. At this time, when this set of cylindrical rollers 7 acts on the abutting deflector plate 21, it can push the abutting deflector plate 21 to rotate. After the two separate, the abutting deflector plate 21 automatically resets under the action of the torsion spring, preparing for the switching action when the sliding frame 2 resets next time.

[0087] Based on the above settings, the locking wheel 16 and the follower plate 17 work together to achieve stable locking of the mounting plate 5 in the non-switching state, ensuring the positional accuracy of the cylindrical rollers 7 of different diameters when they cooperate with the support roller group, thereby ensuring the accuracy and repeatability of the bending angle of the flexible screen. Furthermore, the second convex shaft 12 and the inclined surface of the parallel guide 20 are used to drive unlocking, combined with the automatic reset of the cylindrical spring 14, to achieve automated control of locking and unlocking, with a simple and reliable structure. Through the unidirectional drive design of the deflection plate 21, the mounting plate 5 can selectively rotate during the unidirectional movement of the sliding frame 2, and will not accidentally trigger switching during reverse movement, ensuring the accuracy of the action sequence. At the same time, the bidirectional inclined surface design of the parallel guide 20 allows the sliding frame 2 to actively avoid the locking wheel 16 when moving in the opposite direction, preventing the locking wheel 16 from accidentally coming off, and significantly improving the stability of the locking state.

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A defect detection device for flexible screens based on bending exposure, comprising: The inspection cabinet is equipped with a sliding frame that can move laterally back and forth inside it, and two sets of CCD camera modules for performing visual inspection actions are symmetrically arranged on the sliding frame. Two sets of electric clamps are connected to the inner wall of the testing cabinet via elastic telescopic rods; Its characteristic is that it further includes: Two sets of guide grooves are provided and formed on the sliding frame. The two sets of guide grooves are connected, and a pressure position is formed at the connection of the two sets of guide grooves. Two sets of support rollers are provided and are located on both sides of the pressure application position; The switching component slides within the guide groove. The switching component is equipped with two sets of mounting plates. Each set of mounting plates is circumferentially and equidistantly equipped with multiple sets of cylindrical rollers of different diameters. When the switching component drives the mounting plate to switch to the pressure position, the cylindrical rollers can cooperate with the support roller set to make the flexible screen bend. A locking assembly connects the mounting plate and the testing cabinet. The locking assembly can rotate the mounting plate by a predetermined angle and lock it when the sliding frame performs one reciprocating motion. The switching assembly includes two sets of track patrol components that are slidably installed in the two sets of guide slots, and the two sets of track patrol components are connected by a pull rod. The inspection component is rotatably connected to the mounting plate; The switching assembly also includes a traction structure connected to one of the set of track inspection components; The locking component includes: A toothed belt connects the rotating shafts of the two sets of mounting plates; The follower disk is coaxially and fixedly connected to the rotating shaft of the mounting plate, and the follower disk is provided with multiple sets of Y-shaped grooves; The connecting plate is rotatably connected to the mounting plate via a rotating shaft. The connecting plate is connected to the sliding frame via a guide structure, which enables the connecting plate to remain vertical. An elastic structure is provided on the connecting plate, and a locking wheel adapted to the Y-shaped groove is provided on one side of the elastic structure; A triggering structure is provided inside the detection cabinet. The triggering structure cooperates with the elastic structure to enable the locking wheel to first separate from the Y-shaped groove and then drive the mounting plate to rotate. The elastic structure includes a slider that can slide along the length of the connecting plate. The slider is slidably connected to a vertical shaft disposed on the connecting plate. A cylindrical spring is sleeved on the vertical shaft. One end of the cylindrical spring is connected to the connecting plate, and the other end is connected to the slider. The locking wheel is rotatably mounted on the slider; The triggering structure includes a side plate mounted on the detection cabinet, a lifting plate slidably mounted on the side plate, a parallel guide on the lifting plate, and the parallel guide being adapted to a second convex shaft mounted on the slider; The triggering structure also includes an abutment deflection plate rotatably connected to the side plate. A torsion spring is provided on the rotating shaft of the abutment deflection plate, and a right-angle abutment part is provided at the rotating shaft of the abutment deflection plate. The abutting deflection plate cooperates with the cylindrical roller to drive the mounting plate to rotate.

2. The flexible screen defect detection device based on bending exposure according to claim 1, characterized in that, The guide groove includes a first inclined groove and a first horizontal groove disposed on the sliding frame, wherein the first inclined groove and the first horizontal groove are connected. The pressure application point is located at the end of the first inclined groove that is away from the first horizontal groove.

3. The flexible screen defect detection device based on bending exposure according to claim 1, characterized in that, The traction structure includes a first pneumatic drive structure fixedly installed on the sliding frame and a transverse component connected to the first pneumatic drive structure. The transverse component is provided with a hysteresis groove along its length. The traction structure also includes a first convex shaft rotatably connected to the track inspection component, the first convex shaft being able to roll within the hysteresis groove.

4. The flexible screen defect detection device based on bending exposure according to claim 1, characterized in that, The guide structure includes a fitting shaft rotatably mounted on the connecting plate and a guide groove disposed on the sliding frame, the guide groove being parallel to the guide groove located at the upper part; The guide groove includes a second inclined groove and a second horizontal groove.

5. The flexible screen defect detection device based on bending exposure according to claim 1, characterized in that, The support roller assembly includes a second pneumatic drive structure fixedly mounted on the sliding frame. The second pneumatic drive structure has two actuating ends, and two sets of support rollers are rotatably mounted on each of the two actuating ends.

Images