OLED display screen preparation DIC surface crack defect visual detection device

Abstract

The application relates to the technical field of visual detection, in particular to a DIC surface crack defect visual detection device for OLED display screen preparation, which comprises a workbench, a supporting plate fixed on the workbench, a guide rail fixed on the supporting plate, a sliding plate radially sliding on the guide rail, a limiting assembly for limiting the display screen arranged on the sliding plate, a righting mechanism arranged in the workbench, a connecting plate connected with the righting mechanism, a vertical detection mechanism arranged on the connecting plate, a camera connected with the vertical detection mechanism, the righting mechanism can automatically adjust the deflection angle of the camera through the vertical detection mechanism according to the curvature of the display screen, a pressure balance mechanism arranged on the righting mechanism is used for adaptively adjusting the downward pressure on the connecting plate, through the cooperation of the righting mechanism and the vertical detection mechanism, the camera direction can be automatically adjusted according to the curvature change of the display screen, so that the detection accuracy is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of visual detection, in particular to a DIC surface crack defect visual detection device for OLED display screen preparation. BACKGROUND

[0002] OLED display screen is a self-luminous display technology based on organic materials, widely used in smart phones, televisions, wearable devices and other fields.

[0003] In the preparation of the display screen, it is usually necessary to use DIC (digital image correlation technology) to detect the crack defects on the surface of the display screen in a non-contact manner. DIC technology collects high-resolution images of the surface of the OLED display screen before and after the crack is formed, and analyzes the small deformation of the surface speckle pattern using image processing algorithms to identify the position, length and shape of the crack.

[0004] In the detection process, the visual detector can be controlled to move along the length direction of the display screen by the translation structure to realize the crack defect detection of the display screen. However, when the curved display screen is visually detected, the curved display screen itself has a certain curvature. If the visual detector is controlled to move in the horizontal direction, since the detection angle of the visual detector is constant, it will always be in an inclined state with the display screen, and the inclination angle will be in a state of continuous change, resulting in inaccurate detection results.

[0005] To this end, a curved track with the same curvature as the display screen can be set to guide the movement of the visual detector to ensure that the visual detector always detects the display screen in a vertical direction. However, when detecting other specifications of display screens, since different display screens have different curvatures, it is necessary to replace the curved track every time for detection, and it is impossible to ensure that the curved track is completely coincident with the curvature of the display screen. Therefore, neither the detection efficiency nor the detection accuracy can meet the detection requirements. SUMMARY

[0006] The purpose of the present application is to provide a DIC surface crack defect visual detection device for OLED display screen preparation to solve the problems raised in the background art.

[0007] To achieve the above purpose, the present application provides the following technical scheme:

[0008] The DIC surface crack defect visual detection device for OLED display screen preparation comprises:

[0009] a workbench and a support plate fixed on the workbench, the support plate is fixed with a guide rail, the guide rail slides radially with a sliding plate, and the sliding plate is provided with a limiting assembly for limiting the display screen;

[0010] Further comprising:

[0011] The aligning mechanism is arranged in the workbench, the aligning mechanism is connected with a connecting plate, a vertical detection mechanism is arranged on the connecting plate, the vertical detection mechanism is connected with a camera, and the aligning mechanism can automatically adjust the deflection angle of the camera through the vertical detection mechanism according to the curvature of the display screen.

[0012] As a further scheme of the present application, the aligning mechanism comprises a support column fixed in the workbench, and the support column is rotatably provided with symmetrically arranged deflection plates.

[0013] Further comprising a support assembly and a driven assembly arranged on the deflection plate and used for adjusting the deflection angle of the connecting plate.

[0014] As a further scheme of the present application, the support assembly comprises a support sleeve fixed at the end of the deflection plate, a support rod axially sliding in the support sleeve, and a through groove is formed in the circumferential outer wall of the support sleeve, the connecting plate is fixedly connected with the support rod and slidably connected with the through groove.

[0015] As a further scheme of the present application, the driven assembly comprises a receiving plate fixed at the end of the support rod, and the receiving plate is rotatably provided with symmetrically arranged support wheels.

[0016] As a further scheme of the present application, the vertical detection mechanism comprises a guide plate fixed at the lower side of the connecting plate, a circular arc sliding groove is formed in the guide plate, and a sliding block fixedly connected with the camera is slidingly arranged in the circular arc sliding groove.

[0017] Further comprising a sliding assembly and a translation assembly arranged on the connecting plate and used for controlling the movement of the sliding block.

[0018] As a further scheme of the present application, the sliding assembly comprises a second sliding groove formed in the connecting plate, a follower plate penetrating through the second sliding groove is fixed on the sliding block, and a clamping groove is formed in the follower plate.

[0019] As a further scheme of the present application, the translation assembly comprises a lead screw rotatably arranged on the connecting plate, a threaded sleeve is threadedly connected on the lead screw, and a protrusion slidably embedded in the clamping groove is fixed on the side wall of the threaded sleeve.

[0020] As a further scheme of the present application, further comprising a pressure balancing mechanism arranged on the aligning mechanism and used for adaptively adjusting the downward pressure on the connecting plate, the pressure balancing mechanism comprises a movable ring axially sliding along the support sleeve, a spring is sleeved on the support sleeve, and the two ends of the spring are respectively abutted with the movable ring and the connecting plate.

[0021] As a further scheme of the present application: the pressure balancing mechanism further comprises an arc-shaped plate fixed on the sliding plate, an arc-shaped slot is formed on the arc-shaped plate, and a limiting column fixed on the movable ring is slidably embedded in the arc-shaped slot.

[0022] As a further scheme of the present application: the limiting assembly comprises a first sliding groove formed on the sliding plate and symmetrically arranged, a clamping block is slidably installed in the first sliding groove, and a first air cylinder and a second air cylinder are fixed on the sliding plate and fixedly connected with the clamping block at the telescopic ends.

[0023] Compared with the prior art, the present application has the beneficial effects that: the present application can automatically adjust the yawing angle of the camera according to the curvature of the curved display screen, so that the camera is always in a perpendicular state with the display screen, thereby ensuring the accuracy of the visual detection result; the righting mechanism also drives the pressure balancing mechanism to move, and under the action of the pressure balancing mechanism, the force exerted by the righting mechanism on the display screen is always within a constant range, so as to prevent the display screen from being deformed due to the action force of the righting mechanism.

[0024] By keeping the camera in a perpendicular state with the display screen, the interference of reflected light is reduced, and at the same time, the need for additional correction of the pixel-physical size nonlinear mapping caused by tilting is avoided, and under the action of the circular arc sliding groove, when the camera detects the display screen in a tilting direction, the detection area of the camera will not be shifted, and the irradiation distance of the camera will also not be changed, so as to ensure the accuracy of the detection result.

[0025] Through passive yielding of the connecting plate and active adjustment of the position of the movable ring, it can be ensured that the interval between the movable ring and the connecting plate is always within a certain range when the supporting wheel slides along the curved surface of the display screen, thereby avoiding the continuous compression of the spring when the connecting plate moves towards the yawing plate, which in turn causes the force exerted by the supporting wheel on the display screen to be too large, resulting in deformation or other problems of the display screen caused by the supporting wheel. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Structure schematic view of the DIC surface crack defect visual detection device embodiment for OLED display screen preparation.

[0027] Figure 2 Structure schematic view of another angle in the DIC surface crack defect visual detection device embodiment for OLED display screen preparation.

[0028] Figure 3 Structure schematic view of the clamping assembly and part of the righting mechanism in the DIC surface crack defect visual detection device embodiment for OLED display screen preparation.

[0029] Figure 4 As Figure 3 Another angle of the structural schematic diagram.

[0030] Figure 5 As Figure 4 The structural enlarged schematic diagram at A in the middle.

[0031] Figure 6 As the structural schematic diagram of part of the righting mechanism and the pressure balance mechanism in the embodiment of the DIC surface crack defect visual detection device for OLED display screen preparation.

[0032] Figure 7 As the connection relationship schematic diagram of the righting mechanism, the vertical detection mechanism and part of the pressure balance mechanism in the embodiment of the DIC surface crack defect visual detection device for OLED display screen preparation.

[0033] Figure 8 As the structural schematic diagram of part of the righting mechanism and part of the pressure balance mechanism in the embodiment of the DIC surface crack defect visual detection device for OLED display screen preparation.

[0034] Figure 9 As the exploded structural schematic diagram of part of the righting mechanism and part of the pressure balance mechanism in the embodiment of the DIC surface crack defect visual detection device for OLED display screen preparation.

[0035] Figure 10 As the structural schematic diagram of the vertical detection mechanism in the embodiment of the DIC surface crack defect visual detection device for OLED display screen preparation.

[0036] In the figure: 1, workbench; 2, support plate; 3, guide rail; 4, sliding plate; 401, first sliding groove; 5, first air cylinder; 6, second air cylinder; 7, clamping block; 8, arc plate; 801, arc-shaped groove; 9, support column; 10, deflection plate; 11, support sleeve; 1101, through groove; 12, support rod; 13, receiving plate; 14, support wheel; 15, connecting plate; 1501, second sliding groove; 16, spring; 17, movable ring; 18, limiting column; 19, guide plate; 1901, circular arc sliding groove; 20, sliding block; 21, camera; 22, follow-up plate; 2201, clamping groove; 23, screw rod; 24, threaded sleeve; 25, protrusion. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] In addition, elements in the present application can be referred to as being "fixed" or "set up" on another element, which can be directly on another element or can also exist with a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can also exist with a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0039] Please refer to Figures 1-10 In the embodiment of the present application, the DIC surface crack defect visual detection device for OLED display screen preparation comprises:

[0040] A workbench 1 and a support plate 2 fixed on the workbench 1, the support plate 2 is fixed with a guide rail 3, the guide rail 3 slides radially with a sliding plate 4, the sliding plate 4 is provided with a limiting assembly for limiting the display screen;

[0041] Further comprising:

[0042] A righting mechanism is arranged in the workbench 1, the righting mechanism is connected with a connecting plate 15, the connecting plate 15 is provided with a vertical detection mechanism, the vertical detection mechanism is connected with a camera 21, the righting mechanism can automatically adjust the yaw angle of the camera 21 through the vertical detection mechanism according to the curvature of the display screen;

[0043] A pressure balance mechanism is arranged on the righting mechanism, which is used for self-adaptive adjustment of the downward pressure on the connecting plate 15.

[0044] Specifically, in order to strengthen the visual effect, whether it is a commercial display or a creative scene, etc., a convex curved screen is usually used, so when the convex curved display screen is detected, the curvature of the display screen is usually constant, but the curvature of different specifications of the display screen is different. Therefore, the detection angle of the camera 21 needs to be automatically adjusted according to the curvature of the display screen to ensure that the detection result is the most accurate. When the display screen is placed on the sliding plate 4, the four edges of the display screen are limited under the action of the limiting assembly to ensure that the position of the display screen will not change. At this time, the display screen can be controlled to move radially along the guide rail 3, and when the display screen surface is in contact with the righting mechanism, the righting mechanism can adjust the deflection angle of the connecting plate 15, and the vertical detection mechanism controls the camera 21 to always maintain a vertical detection state with the display screen, thereby ensuring that the camera 21 will not be disturbed by reflected light when performing visual detection due to a certain inclination angle with the display screen, thereby preventing the camera 21 from misjudging the crack defects on the surface of the display screen. The righting mechanism also drives the pressure balancing mechanism to move, and under the action of the pressure balancing mechanism, the force acting on the display screen by the righting mechanism is always within a constant range to prevent the display screen from deforming due to the action force of the righting mechanism.

[0045] Please refer to Figures 1-4 The limiting assembly includes first sliding grooves 401 formed on the sliding plate 4 and arranged symmetrically, clamping blocks 7 are slidably installed in the first sliding grooves 401, first air cylinders 5 and second air cylinders 6 are fixed on the sliding plate 4, and the extension ends of the first air cylinders 5 and the second air cylinders 6 are fixedly connected with the clamping blocks 7.

[0046] It should be noted that the first air cylinder 5 and the second air cylinder 6 are double-head air cylinders, the first air cylinder 5 is horizontally and longitudinally arranged, and the second air cylinder 6 is horizontally and transversely arranged. The clamping blocks 7 are provided in four, and in the initial state, the spacing between the four clamping blocks 7 is maximum under the action of the first air cylinder 5 and the second air cylinder 6, and the clamping blocks 7 are located at the stroke end on one side of the first sliding groove 401, and the sliding plate 4 is located at the stroke end on one side of the guide rail 3.

[0047] At this time, the display screen can be placed on the sliding plate 4, and the arc surface of the display screen is controlled to be located at the upper end. Under the action of the first air cylinder 5 and the second air cylinder 6, the clamping blocks 7 are controlled to slide radially along the first sliding groove 401, and the four clamping blocks 7 move towards each other until the four clamping blocks 7 are in contact with the four edges of the display screen. The display screen is centrally positioned and clamped under the action of the clamping blocks 7 to ensure that the display screen will not shake during subsequent detection of the display screen.

[0048] Please refer to Figures 3-9The correcting mechanism comprises a supporting column 9 fixed in the workbench 1, and symmetrically arranged deflection plates 10 rotatably installed on the supporting column 9; further comprises a supporting assembly and a driven assembly arranged on the deflection plates 10 and used for adjusting the deflection angle of the connecting plate 15, the supporting assembly comprises a supporting sleeve 11 fixed at the end of the deflection plate 10, a supporting rod 12 axially sliding in the supporting sleeve 11, and a through slot 1101 formed in the circumferential outer wall of the supporting sleeve 11, the connecting plate 15 is fixedly connected with the supporting rod 12 and slidably connected with the through slot 1101, and the driven assembly comprises a receiving plate 13 fixed at the end of the supporting rod 12, and symmetrically arranged supporting wheels 14 rotatably installed on the receiving plate 13.

[0049] Please refer to Figure 3 、 Figure 4 、 Figure 7 、 Figure 10 The vertical detection mechanism comprises a guide plate 19 fixed on the lower side of the connecting plate 15, a circular arc sliding groove 1901 formed on the guide plate 19, and a sliding block 20 fixedly connected with the camera 21 and slidingly installed in the circular arc sliding groove 1901; further comprises a sliding assembly and a translation assembly arranged on the connecting plate 15 and used for controlling the movement of the sliding block 20, the sliding assembly comprises a second sliding groove 1501 formed on the connecting plate 15, a follow-up plate 22 fixed on the sliding block 20 and penetrating through the second sliding groove 1501, and a clamping groove 2201 formed on the follow-up plate 22, and the translation assembly comprises a lead screw 23 rotatably installed on the connecting plate 15, and a threaded sleeve 24 threadedly connected with the lead screw 23 and fixedly provided with a protrusion 25 slidably embedded in the clamping groove 2201.

[0050] In detail, when the display screen is not placed on the sliding plate 4, in the natural state, the gravity controls the receiving plate 13 and the sliding plate 4 to be in parallel, and the supporting wheels 14 are just attached to the surface of the sliding plate 4, for this, the supporting sleeve 11 and the supporting rod 12 are perpendicular to the sliding plate 4, and the supporting rod 12 is located at the end of the stroke away from the supporting sleeve 11, so that the connecting plate 15 is parallel to the sliding plate 4, and the connecting plate 15 is located at the end of the stroke away from the deflection plate 10 on one side of the through slot 1101, at this time, the sliding block 20 is located at the middle position of the circular arc sliding groove 1901, so that the orientation of the camera 21 is perpendicular to the sliding plate 4, under the action of the arc-shaped groove 801, the spacing between the movable ring 17 and the connecting plate 15 is kept relatively balanced, and the pressure balance mechanism always provides a pushing force to the connecting plate 15 in the direction of the sliding plate 4;

[0051] The circular arc sliding groove 1901 is arranged in a circular arc shape, and the center of the circle is located at the center of the horizontal plane of the lowermost side of the two groups of support wheels 14. In this case, when the support wheels 14 slide along the curved surface of the display screen, the sliding block 20 slides along the circular arc sliding groove 1901 to adjust the position of the camera 21, and the irradiation area of the camera 21 and the axial distance between the camera 21 and the display screen in the irradiation direction are always kept unchanged;

[0052] Please refer to Figure 4 When the curved display screen is placed on the sliding plate 4 and is limited by the limiting assembly, the sliding plate 4 can be driven to slide along the radial direction of the guide rail 3, so that the display screen moves towards the direction of the support wheels 14. The support wheels 14 will slide along the curved surface of the display screen, and when the two support wheels 14 are in contact with the display screen, the support force provided by the two support wheels 14 to the display screen remains unchanged under the action of the pressure balance mechanism, and the support wheels 14 automatically swing to adapt to the swing of the swing plate 10. Therefore, the swing plate 10 is driven to rotate around the support column 9 by the support rod 12 and the support sleeve 11, until the swing plate 13 is parallel to the tangent plane of the display screen at the center of the two support wheels 14. At this time, the camera 21 is perpendicular to the tangent plane of the display screen at this position. At this time, the camera 21 can be used to detect the crack defects on the surface of the display screen.

[0053] Subsequently, the sliding plate 4 continues to move, and the support wheels 14 will gradually move towards the most protruding position of the display screen along the curved surface of the display screen. In this process, the swing plate 10 will automatically and continuously adjust the swing angle according to the position change of the support wheels 14 on the display screen, so that the camera 21 is always kept in a perpendicular position with the display screen.

[0054] Please refer to Figure 10 When the camera 21 detects the existence of crack defects in the area, in order to enhance the texture and contrast of the surface of the display screen, it is usually necessary to control the camera 21 to swing a certain angle along the vertical axis of the tangent of the display screen for detection, so as to ensure the accuracy of the detection result. For this purpose, the screw rod 23 can be controlled to rotate and drive the threaded sleeve 24 to move. Under the action of the protrusion 25 and the clamping groove 2201, the follower plate 22 is controlled to slide along the second sliding groove 1501, so as to drive the sliding block 20 to slide along the circular arc sliding groove 1901. Since the sliding block 20 and the circular arc sliding groove 1901 have a guiding effect, the threaded sleeve 24 can slide along the axial direction of the screw rod 23, and will not rotate with the screw rod 23. When the camera 21 swings to the required angle, further detection can be carried out to ensure the accuracy of the detection of the crack defects on the surface of the display screen by using the contrast of the shadow to enhance the speckle or small crack in the inclined direction.

[0055] Preferably, the support force provided to the support wheel 14 by the pressure balancing mechanism can ensure that the forces applied by the two support wheels 14 on the display screen are the same, so as to control the automatic deflection of the bearing plate 13 to be parallel to the tangent plane of the display screen at the position, so that the deflection angle of the camera 21 can be automatically adjusted during the entire detection process of the curved display screen, and the angle of the camera 21 can be automatically corrected even when detecting display screens with different curvatures, so as to ensure that the camera 21 is always perpendicular to the display screen, thereby reducing the interference of reflected light, and at the same time, without additional correction of the pixel-physical size nonlinear mapping caused by tilting, and under the action of the circular arc sliding groove 1901, the detection area of the camera 21 will not be offset when the camera 21 detects the display screen in the tilting direction, and the illumination distance of the camera 21 will also not change, so as to ensure the accuracy of the detection result.

[0056] Referring to Figures 3-9 , the pressure balancing mechanism includes a movable ring 17 sliding axially along the support sleeve 11, a spring 16 is sleeved on the support sleeve 11, and the two ends of the spring 16 are respectively abutted with the movable ring 17 and the connecting plate 15, the pressure balancing mechanism further includes an arc-shaped plate 8 fixed on the sliding plate 4, the arc-shaped plate 8 is formed with an arc-shaped groove 801, and the movable ring 17 is fixed with a limiting column 18 slidingly fitted in the arc-shaped groove 801.

[0057] Referring to Figure 6 , further, the arc-shaped groove 801 is arranged in a circular arc shape, and after the display screen is limited by the limiting assembly, the center of the arc-shaped groove 801 and the center of the display screen are located on the same vertical axis, in the initial state, the sliding plate 4 is located at the end of the stroke close to the opening side of the workbench 1, at this time, the limiting column 18 is located at the end of the stroke on one side of the arc-shaped groove 801, so that the spacing between the movable ring 17 and the sliding plate 4 is minimized, the support wheel 14 is in a state of adhesion with the sliding plate 4, and the spacing between the connecting plate 15 and the sliding plate 4 is also minimized, therefore, the spacing between the movable ring 17 and the connecting plate 15 is always in a state of mutual balance, and the elongation of the spring 16 in the natural state is greater than the maximum spacing between the movable ring 17 and the connecting plate 15, for this, the spring 16 is in a pre-compressed state, and always provides a pushing force to the connecting plate 15 in the direction close to the sliding plate 4;

[0058] When visual detection of the curved display screen is needed, the sliding plate 4 will slide along the radial direction of the guide rail 3, so that the display screen moves, and the sliding plate 4 will also drive the arc-shaped plate 8 to move, when the display screen is in adhesion with the support wheel 14, the support wheel 14 will move a certain distance away from the sliding plate 4, thereby driving the connecting plate 15 to move, under the action of the support wheel 14, the spacing between the camera 21 and the display screen is always kept unchanged, and the camera 21 is always kept perpendicular to the display screen;

[0059] The connecting plate 15 also drives the spring 16 to move, since the limiting column 18 always slides along the arc-shaped slot 801 relative to the arc-shaped plate 8 when the arc-shaped plate 8 moves, the limiting column 18 will drive the movable ring 17 to move away from the sliding plate 4, so that the interval between the movable ring 17 and the connecting plate 15 is always kept within a certain range, so as to ensure that the compression amount of the spring 16 is always within a certain range.

[0060] Preferably, through the passive displacement of the connecting plate 15 and the active adjustment of the position of the movable ring 17, it can be ensured that the interval between the movable ring 17 and the connecting plate 15 is always within a certain range when the supporting wheel 14 slides along the curved surface of the display screen, thereby avoiding the continuous compression of the spring 16 caused by the movement of the connecting plate 15 towards the direction of the deflection plate 10, and further avoiding the excessive force of the supporting wheel 14 acting on the display screen, which may cause the display screen to be deformed or other problems caused by the extrusion of the supporting wheel 14.

[0061] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0062] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A visual inspection device for DIC surface crack defects in OLED display fabrication, comprising: The worktable and the support plate fixed on the worktable, the support plate is fixed with a guide rail, the guide rail has a sliding plate that slides radially, and the sliding plate is provided with a limiting component for limiting the display screen. Its characteristic is that it further includes: A straightening mechanism is installed inside the workbench. The straightening mechanism is connected to a connecting plate. A vertical detection mechanism is installed on the connecting plate. A camera is connected to the vertical detection mechanism. The straightening mechanism can automatically adjust the tilt angle of the camera according to the curvature of the display screen through the vertical detection mechanism. The alignment mechanism includes a support column fixed inside the workbench, and symmetrically arranged deflection plates are rotatably mounted on the support column. It also includes a support assembly and a driven assembly disposed on the deflection plate for adjusting the deflection angle of the connecting plate; The support assembly includes a support sleeve fixed to the end of the deflection plate, a support rod axially sliding inside the support sleeve, a through groove formed on the outer circumferential wall of the support sleeve, and a connecting plate fixedly connected to the support rod and slidably connected to the through groove. The driven component includes a receiving plate fixed to the end of the support rod, and symmetrically arranged support wheels are rotatably mounted on the receiving plate; The vertical detection mechanism includes a guide plate fixed to the lower side of the connecting plate, and an arc groove is formed on the guide plate. A sliding block fixedly connected to the camera is slidably installed in the arc groove. It also includes a sliding component and a translation component disposed on the connecting plate for controlling the movement of the slider; The sliding assembly includes a second sliding groove formed on the connecting plate, and a follower plate that passes through the second sliding groove is fixed on the sliding block, and a slot is formed on the follower plate; The translation component includes a lead screw rotatably mounted on the connecting plate, a threaded sleeve threadedly connected to the lead screw, and a protrusion fixed to the side wall of the threaded sleeve that slides into the slot.

2. The visual inspection device for DIC surface crack defects in OLED display fabrication according to claim 1, characterized in that, It also includes a pressure balancing mechanism, which is disposed on the alignment mechanism and is used to adaptively adjust the downward pressure on the connecting plate; the pressure balancing mechanism includes a movable ring that slides along the axial direction of the support sleeve, and a spring is sleeved on the support sleeve, with the two ends of the spring abutting against the movable ring and the connecting plate respectively.

3. The visual inspection device for DIC surface crack defects in OLED display fabrication according to claim 2, characterized in that, The pressure balancing mechanism also includes an arc-shaped plate fixed on the sliding plate, an arc-shaped groove formed on the arc-shaped plate, and a limiting post fixed on the movable ring that slides and engages with the arc-shaped groove.

4. The visual inspection device for DIC surface crack defects in OLED display fabrication according to claim 1, characterized in that, The limiting component includes a first sliding groove formed on the sliding plate and symmetrically arranged, a clamping block is slidably installed in the first sliding groove, a first cylinder and a second cylinder are fixed on the sliding plate, and the telescopic ends of the first cylinder and the second cylinder are fixedly connected to the clamping block.

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