Full-automatic display screen surface defect detection device

Abstract

This invention relates to the technical field of product testing, and in particular to a fully automatic detection device for surface defects of a display screen, comprising: a frame, and a conveying and positioning module mounted on the frame for carrying and conveying the display screen to be inspected to a preset inspection station and positioning it; an image acquisition module for acquiring multi-angle images of the display screen located at the inspection station; wherein, the conveying and positioning module includes a drive unit mounted on the frame, the drive unit being connected to a vacuum adsorption fixing stage; the image acquisition module includes a mounting cover mounted on the frame, the mounting cover housing at least two sets of imaging units, at least one set of imaging units facing the front of the display screen to be inspected, and at least one set of imaging units facing the side of the display screen to be inspected, and the image acquisition module also includes a plane reflector disposed on the side of the display screen to be inspected. This invention achieves fully automatic detection of surface defects of a display screen with high precision, high efficiency, and no secondary damage.

Description

Technical Field

[0001] This invention relates to the technical field of product testing, and in particular to a fully automatic detection device for surface defects of a display screen. Background Technology

[0002] Against the backdrop of the rapid development of the current electronic information industry, displays, as core components of terminal products such as smartphones, tablets, and smart home devices, have seen their market size and production capacity continue to expand, becoming one of the pillars of the information industry. As display technology evolves towards higher resolution and higher definition, new requirements have been placed on the quality of screen appearance. This makes the detection of surface defects in displays a crucial step in ensuring product yield, maintaining brand reputation, and controlling production costs.

[0003] Traditional defect detection primarily relies on manual visual inspection. This method is inefficient, prone to missed defects due to visual fatigue, and suffers from inconsistent and traceable digital records due to varying inspection standards. Furthermore, rising wages and increased recruitment difficulties have led to escalating labor costs. To address these issues, automated optical inspection systems based on machine vision have become an inevitable choice for industry upgrades. In recent years, numerous inspection systems have emerged, most employing traditional image processing algorithms or more advanced deep learning models for defect identification and classification. These algorithmic advancements have significantly improved the accuracy and intelligence of inspection.

[0004] However, at the hardware and mechanical system structure level, existing detection devices often have a fundamental limitation, which restricts the maximization of algorithm performance and further improvement of overall detection efficiency. Common detection schemes in existing technologies, in order to acquire images of the front and multiple sides of the display screen for omnidirectional inspection, typically require the use of robotic arms to grip or a rotating stage to repeatedly move and rotate the screen. For example, in some publicly available inspection processes, the product needs to be opened to 180°, the LCD screen placed horizontally on a stage, and then images are acquired by a camera through the movement of the stage.

[0005] However, vibrations and micro-displacements are unavoidable during the gripping, flipping, and stage movement of the robotic arm. These movements can easily blur the acquired images, affecting the accuracy of subsequent image processing algorithms, especially for minute defects requiring high-resolution images for identification. Furthermore, the multiple flips and repositioning processes significantly increase the overall inspection time. For high-volume production lines, this directly limits the inspection cycle time, failing to meet the efficiency requirements of large-scale production. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a structure in which "the workpiece is stationary and the camera and reflector surround and synchronously image," which reduces the risk of image blurring, low detection efficiency, and product damage caused by workpiece movement in traditional detection methods. This invention enables a fully automated display screen surface defect detection device with high precision, high efficiency, and no secondary damage.

[0007] The above-mentioned objective of this invention is achieved through the following technical solutions:

[0008] A fully automated surface defect detection device for a display screen includes: a frame, and components mounted on the frame:

[0009] The conveying and positioning module is used to carry and convey the display screen to be inspected to the preset inspection station and perform positioning.

[0010] The image acquisition module is used to acquire images from multiple angles of the display screen located at the detection station;

[0011] The conveying and positioning module includes a drive unit mounted on the frame, and the drive unit is connected to a vacuum adsorption fixing platform.

[0012] The image acquisition module includes a mounting cover mounted on a rack. At least two sets of imaging units are installed inside the mounting cover. At least one set of imaging units faces the front of the display screen to be inspected, and at least one set of imaging units faces the side of the display screen to be inspected. The image acquisition module also includes two planar reflectors disposed on the side of the display screen to be inspected.

[0013] As a specific embodiment of the fully automatic detection device for surface defects of display screen disclosed in this invention, the conveying and positioning module further includes a pre-alignment mechanism, which is located upstream of the detection station and includes a pair of alignment blocks that can move towards or away from each other.

[0014] As a specific embodiment of the fully automatic detection device for surface defects of the display screen disclosed in this invention, the centering block is provided with an elastic flexible pad on the side facing the screen.

[0015] As a specific embodiment of the fully automatic detection device for surface defects of the display screen disclosed in this invention, the platform of the vacuum adsorption fixing stage has a partitioned structure forming multiple independent air chambers, and each of the independent air chambers is connected to a control valve that can be independently turned on and off.

[0016] As a specific embodiment of the fully automatic detection device for surface defects of the display screen disclosed in this invention, the surface of the vacuum adsorption fixing stage is covered with a removable porous flexible pad.

[0017] As a specific embodiment of the fully automatic detection device for surface defects of the display screen disclosed in this invention, the mounting cover is disposed on the conveying and positioning module, and the mounting cover has a feed port.

[0018] As a specific embodiment of the fully automatic detection device for surface defects of a display screen disclosed in this invention, the imaging unit includes:

[0019] The mounting base includes a base plate and a support plate fixedly mounted on the upper surface of the base plate;

[0020] The camera is mounted on the support plate at an adjustable angle.

[0021] As a specific embodiment of the fully automatic detection device for surface defects of a display screen disclosed in this invention, a lifting mechanism is installed on the lower end face of the imaging unit facing the front of the display screen to be inspected. The lifting mechanism includes:

[0022] An arched frame is installed on the machine frame;

[0023] The lower mounting base is fixedly connected to the upper end face of the arched frame. A lower guide rail is provided on its upper end face. A set of parallel sliding blocks are slidably connected to the lower guide rail.

[0024] The upper mounting base is located directly above the lower mounting base. Its upper end face is fixedly connected to the imaging unit facing the front of the display screen to be inspected. Its lower end face is provided with an upper guide rail. The upper guide rail is slidably connected to a set of parallel upper sliding blocks.

[0025] The sliding block and the upper sliding block are connected by at least one set of cross-arranged lifting rods. Two lifting rods in the same set are rotatably connected at the cross position, and the two ends of each lifting rod are rotatably connected to the upper sliding block and the lower sliding block, respectively.

[0026] A double-threaded rod passes through the two sliding blocks. The double-threaded rod has two opposing threads along its middle section towards both ends, and the two threads are respectively threadedly connected to the two sliding blocks.

[0027] As a specific embodiment of the fully automatic detection device for surface defects of the display screen disclosed in this invention, each of the plane mirrors is correspondingly installed on a radial linear slide, and the driving direction of each radial linear slide is directed towards the center of the detection station.

[0028] As a specific embodiment of the fully automatic detection device for surface defects of display screen disclosed in this invention, a vibration isolation base is also installed on the frame, which is used to reduce the impact of external vibration on the detection.

[0029] In summary, the present invention has at least one of the following beneficial technical effects:

[0030] 1. The present invention discloses a fully automatic detection device for surface defects of display screens. This embodiment achieves high precision, high efficiency and high stability in the detection of surface defects of display screens through integrated and collaborative overall design. The device uses a rigid frame combined with a vibration isolation base as a stable foundation to ensure that each precision module works in an interference-free environment. At the same time, it adopts an imaging layout of "workpiece stationary, camera surrounding", which avoids image blurring and potential mechanical damage caused by workpiece movement in traditional motion detection methods, thereby improving the reliability and rhythm of detection as a whole.

[0031] 2. In the conveying and positioning module, a high-precision linear motor or ball screw drive, in conjunction with a vacuum adsorption fixing table, enables precise conveying and positioning of the display screen. The fixing table adopts a zoned independent vacuum adsorption design, which can intelligently activate the corresponding adsorption zone according to the size and shape of the display screen. While providing uniform and sufficient adsorption force, it avoids warping caused by insufficient edge adsorption and significantly reduces energy consumption and the risk of dust inhalation. The replaceable flexible pad covering the table further disperses the adsorption stress and prevents indentation or scratches on the back of the display screen. Structurally, it takes into account both positioning accuracy and product safety.

[0032] 3. The image acquisition module uses a combination of multiple cameras and plane mirrors to achieve synchronous image acquisition from the front and multiple sides of the display screen. The front camera is equipped with a lifting mechanism, which can drive the cross lifting rod through a double threaded rod to achieve precise vertical focusing, ensuring that the front field of view matches the light source. A radially adjustable plane mirror is introduced into the side detection optical path. The plane mirror is driven to move radially along the center of the detection station through a radial slider, so that the side of the display screen of different thicknesses is always within the camera's optimal imaging area. This effectively solves the problem of field of view deviation caused by product thickness differences and improves the adaptability and consistency of the detection system.

[0033] 4. To meet the need for rapid production changeover of multiple display screen models, this implementation method sets up a matching structure between a universal base and a special panel on the vacuum adsorption fixing platform, and integrates an automatic panel changing mechanism. Through the collaborative operation of a rotating multi-layer panel library and a simple robotic arm, the automatic picking, placing and positioning of special panels can be completed within minutes without manual intervention. This ensures the uniformity of the positioning benchmark for different product models and greatly improves equipment utilization and production line flexibility.

[0034] 5. The vibration isolation base module adopts a combination of airbag support and active control system, which provides excellent vibration resistance for the whole device. The airbag passively isolates low-frequency vibrations from the ground, while the displacement or tilt sensor monitors the platform status and adjusts the corresponding airbag pressure in real time, which can actively counteract the self-excited vibrations generated by the internal movement of the equipment. This ensures the platform remains stable during dynamic operation and provides a crucial environmental guarantee for high-precision imaging and positioning. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a fully automatic detection device for surface defects of a display screen disclosed in this invention;

[0036] Figure 2 This is a top view of the conveying and positioning module of an embodiment of a fully automatic detection device for surface defects of a display screen disclosed in this invention;

[0037] Figure 3 yes Figure 2 A magnified view of part A in the middle;

[0038] Figure 4 This is a front view of the image acquisition module of an embodiment of a fully automatic detection device for surface defects of a display screen disclosed in this invention;

[0039] Figure 5 yes Figure 4 A sectional view of section BB;

[0040] Figure 6 yes Figure 5 A magnified view of part C in the middle;

[0041] Figure 7 This is a schematic diagram of the imaging unit of an embodiment of a fully automatic detection device for surface defects of a display screen disclosed in this invention.

[0042] Figure label:

[0043] 1. Rack;

[0044] 2. Conveying and positioning module; 21. Drive unit; 22. Vacuum adsorption fixing stage; 23. Pre-alignment mechanism; 231. Alignment block;

[0045] 3. Image acquisition module; 31. Mounting cover; 32. Shooting unit; 321. Mounting base; 3211. Base plate; 3212. Support plate; 3213. Inclination knob; 322. Camera; 33. Plane reflector; 331. Radial linear slide; 3311. Guide table; 3312. Adjustment knob; 3313. Radial slider; 3314. Damping ball; 34. Lifting mechanism; 341. Arch frame; 342. Lower mounting base; 3421. Lower guide rail; 3422. Sliding block; 343. Upper mounting base; 3431. Upper guide rail; 3432. Upper sliding block; 344. Lifting rod; 345. Double threaded rod; 35. Panel replacement mechanism; 351. Multi-layer panel library; 352. Adsorption plate;

[0046] 4. Vibration isolation base. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings.

[0048] Please see Figure 1-7 This invention discloses a fully automatic surface defect detection device for a display screen. The main structure of the device is based on a rigid frame 1, which is typically constructed of welded steel or high-strength aluminum alloy profiles. Internal reinforcing ribs are provided to ensure overall stability, providing a solid foundation for all precision motion modules. The frame 1 can be covered with a sheet metal shell, forming a relatively enclosed clean chamber. The shell is equipped with a viewing window and an easy-to-maintain inspection door.

[0049] The inspection device disclosed in this invention includes a conveying and positioning module 2, an image acquisition module 3, and a vibration isolation base 4. The conveying and positioning module 2 is responsible for receiving the display screen to be inspected from the previous station. The previous station typically uses mechanical clamps to move the display screen to the conveying and positioning module 2. This module transports and fixes the display screen to the inspection station, creating the prerequisite for high-quality image acquisition. The image acquisition module 3 is responsible for simultaneously acquiring high-definition surface images from the front and multiple side angles of the display screen after it is fixed. This inspection method differs from traditional workpiece movement modes, significantly avoiding image blurring and potential damage caused by movement. The vibration isolation base 4, as part of the entire device, effectively reduces external vibrations from the ground and internal micro-vibrations generated by the moving parts of the equipment itself, providing crucial environmental protection for high-precision imaging and stable operation.

[0050] First, the conveying and positioning module 2 is described in detail. The conveying and positioning module 2 uses a high-precision linear motor module or a high-precision ball screw slide driven by a servo motor as the drive unit 21. The drive unit 21 directly drives a vacuum adsorption fixing stage 22, which carries the display screen to be tested, to reciprocate along a linear guide rail. The linear guide rail can be heavy-duty or precision type, and can also be equipped with a pre-tightened slider to eliminate backlash. The start-up, stop, and speed curve of the vacuum adsorption fixing stage 22 are precisely controlled by the servo system, reducing accumulated errors and random deviations during the conveying process. Before the vacuum adsorption fixing stage 22 enters the final image acquisition station, a pre-alignment mechanism 23 is set up. The pre-alignment mechanism 23 typically consists of a pair of alignment blocks 231 driven by a small servo motor or stepper motor, symmetrically arranged on both sides of the conveying path. When the display screen enters the pre-alignment area with the moving platform, the alignment blocks 231 on both sides move synchronously towards each other under control, contacting the two edges of the display screen and correcting the display screen to the ideal position of the conveying center line. This process is flexible, the contact force can be precisely controlled, reducing rigid impacts. After pre-alignment, the mobile platform accurately delivers the display screen to the inspection station.

[0051] The vacuum adsorption stage 22 is constructed from a high-precision ground metal plate with through holes drilled in a specific matrix. These through holes are not directly connected to a common vacuum chamber; instead, the vacuum adsorption stage 22 is divided into several independent adsorption zones. These zones can be divided into grids such as 2x2 or 4x4, with each zone corresponding to an independent gas chamber and connected to the vacuum generator via an independent solenoid valve. When the display screen is positioned above the stage and then lowered, the control system, based on the current screen size, only opens the solenoid valves corresponding to the adsorption zones completely or primarily covered by the display screen, while keeping the valves closed for zones outside the display screen or uncovered. This design serves multiple purposes: First, it ensures that the adsorption force is concentrated on the support area of ​​the display screen, providing the most effective fixation and preventing positional shifts caused by airflow disturbances or micro-vibrations during shooting. Second, it avoids unnecessary exposure of the vacuum adsorption area, reducing energy consumption and the risk of dust being sucked into the system. Third, for smaller displays, this design prevents warping or displacement due to insufficient edge adsorption force. For irregularly shaped displays or those with protruding structures, specific areas can be programmed to shield, achieving precise avoidance adsorption. To reduce potential indentations, scratches, or contamination of the delicate coating on the back of the display screen caused by vacuum adsorption, a replaceable porous flexible pad is laid on the metal surface of the vacuum adsorption mounting platform 22. This flexible pad is typically made of open-cell silicone, polyurethane, or other porous materials with appropriate elasticity and abrasion resistance. On one hand, it acts as a buffer protective film, evenly dispersing the concentrated stress from vacuum adsorption; on the other hand, its numerous micropores ensure that the vacuum adsorption force is transmitted to the back of the display screen without attenuation, achieving a stable grip. The flexible pad is fixed to the table surface by means of peripheral slots or magnetic strips, making it easy for operators to quickly remove it for cleaning or replacement during routine maintenance, thus maintaining good adsorption performance and product protection capabilities over the long term.

[0052] The image acquisition module 3 is the core execution component for realizing the detection function. Traditional devices typically require a robotic arm or a flip table to hold the display screen for multiple flips and repeated positioning to detect the front and four sides of the screen. This process is time-consuming and prone to collision risks. This invention adopts a layout where the workpiece is stationary and the cameras 322 surround it. Specifically, a mounting cover 31 is installed on the frame 1, covering the top and sides of the inspection station. Multiple imaging units 32 are integrated on this frame, with at least one set facing the front of the display screen to be inspected and at least one set facing the sides of the display screen. Here, the front direction refers to the direction of movement of the display screen, and the side direction should be understood as being located on both sides of the display screen and perpendicular to the front direction. A plane reflector 33 is also provided on the side of the display screen to be inspected, cooperating with the imaging units 32.

[0053] In one specific embodiment of the detection device disclosed in this invention, the imaging unit 32 includes a mounting base 321 and a camera 322 for imaging. The mounting base 321 includes a base plate 3211 and a support plate 3212 fixedly mounted on the upper surface of the base plate 3211. The camera 322 is angle-adjustably mounted on the support plate 3212. Specifically, the camera 322 is fixedly mounted via a rotatable tilt knob 3213 relative to the support plate 3212. The tilt knob 3213 can be fixed by bolts or other means. This allows the angle of the camera 322 to be adjustable within a certain range to adapt to different displays to be inspected.

[0054] Furthermore, a lifting mechanism 34 is installed on the lower end face of the imaging unit 32 facing the front of the display screen to be inspected. The lifting mechanism 34 includes an arched frame 341, a lower mounting base 342, an upper mounting base 343, a lifting rod 344, and a double threaded rod 345. The arched frame 341 is mounted on the frame 1. The lower mounting base 342 is fixedly connected to the upper end face of the arched frame 341. The upper end face of the lower mounting base 342 is provided with a lower guide rail 3421. A set of parallel sliding blocks 3422 are slidably connected to the lower guide rail 3421. The upper mounting base 343 is located directly above the lower mounting base 342. Its upper end face is fixedly connected to the imaging unit 32 facing the front of the display screen to be inspected. Its lower end face is provided with an upper guide rail 3431. A set of parallel upper sliding blocks 3432 are slidably connected to the upper guide rail 3431. The lower sliding block 3422 and the upper sliding block 3432 are connected by at least one set of cross-arranged lifting rods 344. The two lifting rods 344 in the same set are rotatably connected at the cross position. The two ends of each lifting rod 344 are rotatably connected to the upper sliding block 3432 and the lower sliding block 3422, respectively. The double-threaded rod 345 passes through the two upper sliding blocks 3432. The double-threaded rod 345 has two reverse threads along its middle section towards both ends. The two threads are respectively threaded to the two upper sliding blocks 3432.

[0055] When the double-threaded rod 345 rotates, the two upper sliding blocks 3432 move away from or closer to each other, which in turn drives the lifting rod 344 to rotate relative to each other. The rotation of the lifting rod 344 causes the upper mounting base 343 and the lower mounting base 342 to move closer and further apart, thereby moving the camera 322 vertically. It should be understood that, to ensure uniform illumination and defect visibility, a coaxial light source or a large-area annular surface light source is typically used to eliminate reflections and illuminate the surface microstructure.

[0056] For side inspection of a display screen, the traditional approach is to tilt the camera 322 directly towards the side, but this occupies a lot of space and is prone to interference with other mechanisms. This invention introduces a plane mirror 33 as an optical path deflection element. Each side-mounted imaging unit 32 is paired with a plane mirror 33. The plane mirror 33 is tilted relative to the side of the display screen, with its mirror surface facing the corresponding side of the screen. Thus, the image from the side of the display screen, after being reflected by the plane mirror 33, enters precisely the field of view of the camera 322 of its corresponding side imaging unit 32. This layout reduces the space required for side imaging, significantly compressing the overall size of the device, and allowing all cameras 322 and light sources to be arranged more compactly on the mounting cover 31. Simultaneously, all sides undergo true synchronous image acquisition; with a single trigger, all cameras 322 expose simultaneously, capturing the state of each side of the display screen at the same instant. This is crucial for detecting defects that may change due to stress release or capturing transient phenomena, and reduces the inspection cycle to a fraction of that of traditional flip-type methods.

[0057] However, the fixed-angle plane mirror 33 may have different radial positions due to variations in the thickness of different display screen models. If the plane mirror 33 is fixed in position, for thinner display screens, its side may be located at the far end of the field of view of the camera 322, resulting in an excessively large field of view and insufficient detail resolution; for thicker display screens, its side may be too close to the plane mirror 33 or even beyond the field of view, leading to incomplete imaging. Therefore, in this invention, the plane mirror 33 of each side-mounted imaging unit 32 is mounted on a radial linear slide 331 for adjusting the radial position of the plane mirror 33. The radial linear slide 331 comprises a guide table 3311 mounted on the frame 1, an adjustment knob 3312 threadedly connected to the guide table 3311, and a radial slider 3313 rotatably connected to the adjustment knob 3312. The plane mirror 33 and its mounting base 321 are fixed to the moving part of the slide, and the drive axis of the slide is strictly aligned with the center of the inspection station. When the device switches between displays of different thicknesses, rotating the adjustment knob 3312 drives the radial slider 3313 to slide, which in turn moves the plane mirror 33 radially in sync. This ensures that regardless of the display thickness, its sides remain within the optimal depth of field and center of view formed by each camera 322 via the plane mirror 33. It should be understood that the mounting base 321 of the plane mirror 33 is connected to the radial slider 3313 via a damping ball 3314, allowing the plane mirror 33 itself to have micro-adjustment capabilities in the pitch and yaw directions. This is used to precisely calibrate the optical path during initial installation or periodic calibration, ensuring accurate spatial correspondence between the side views and the front view.

[0058] It should be understood that the present invention is adaptable to various displays to be inspected. By rotating the double helical rod 345, the two upper sliding blocks 3432 can be moved closer or further apart. When the double helical rod 345 rotates, the two upper sliding blocks 3432 move further apart or closer together, causing the camera 322 to move vertically. The height of the camera 322 is adjusted to be aligned with the imaging unit 32 of the display to be inspected. Then, by rotating the tilt knob 3213, the shooting angle of the camera 322 can be adjusted. Combined with the angle of the plane reflector 33 and the horizontal distance, it can be adjusted to adapt to different specifications of displays to be inspected.

[0059] As a specific embodiment of the testing device disclosed in this invention, the positioning reference and product support surface of the testing station may also need to change according to the product. A universal base can be fixed on the vacuum adsorption fixing stage 22, which has precision positioning pin holes and standard interfaces; a special panel designed according to each specific model of display screen. The special panel is machined with corresponding contour support surface, clearance groove and positioning pin according to the outline and back structure of the display screen of that model. When changing models, it is the special panel that needs to be replaced, not the entire fixture. In order to automate the replacement of the special panel, a panel replacement mechanism 35 can be integrated on the side of the equipment. The panel replacement mechanism 35 is usually a vertical or horizontally placed rotating multi-layer panel library 351, shaped like a turret. Each layer can store a special panel of a certain model. The panel library is driven by a servo motor to rotate in an indexing manner. At the same time, a simple multi-degree-of-freedom robot is provided, and all the movements of the robot can be driven by cylinders. When a changeover is required, the control system rotates the multi-layer panel holder 351 to the layer containing the target panel. The robotic arm moves to this position, grasps the panel using the suction plate 352, and transports it to the inspection station. It is then precisely placed on the positioning pins of the universal base and secured using a pneumatic or mechanical locking mechanism. Simultaneously, the used panel is removed from the station and returned to an empty slot in the panel holder. The entire process requires no manual intervention, can be completed within minutes, and boasts extremely high repeatability, ensuring consistency in inspection standards across different batches of products.

[0060] The vibration isolation base module 4 is mounted on the frame 1, located below the aforementioned structure, providing a stable working platform for all the precision mechanical structures. Vibrations from industrial production workshop floors, the operation of nearby large equipment, and the starting and stopping of the device's own high-speed moving parts can all generate harmful vibrations, ranging from blurred images to affecting positioning accuracy and mechanical lifespan. Multiple high-performance airbags are evenly distributed beneath the vibration isolation base 4. Compressed air is continuously injected into these airbags via a pressure regulating valve, causing them to expand and lift the entire device, forming a low-stiffness, high-damping air cushion support. This effectively isolates low-frequency ground vibrations.

[0061] Passive air-floating platforms have limited ability to suppress dynamic disturbances generated by internal moving parts, which may lead to slight swaying or tilting of the platform. This self-excited vibration is also harmful. Therefore, this invention installs highly sensitive displacement or tilt sensors at multiple locations on the platform base to monitor minute displacements or attitude changes of the platform in real time. When a sensor detects platform instability caused by internal movement, the signal is immediately transmitted to a fast-response control system. This system then adjusts a precision high-speed pressure regulating valve near the corresponding airbag, instantaneously increasing or decreasing the air pressure inside the airbag to generate a corrective force or torque, thereby actively and dynamically canceling out the interference and allowing the platform to quickly return to a horizontal and stable state. Each sensor corresponds to a numerical range; when the value detected by the sensor is higher or lower than this preset range, the air pressure inside the detected airbag is increased or decreased according to preset instructions.

[0062] In summary, the fully automatic surface defect detection device for display screens described in this invention achieves non-destructive, high-precision conveying and fixing of workpieces through the conveying and positioning module 2, achieves multi-angle, high-efficiency, and non-secondary-damage synchronous image acquisition through the image acquisition module 3, and provides top-level stability assurance for the entire process through the vibration isolation base module 4.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fully automatic detection device for surface defects of a display screen, characterized in that, include: The frame (1), and the components mounted on the frame (1): The conveying and positioning module (2) is used to carry and convey the display screen to be inspected to the preset inspection station and perform positioning. Image acquisition module (3) is used to acquire multi-angle images of the display screen to be inspected located at the inspection station; The conveying and positioning module (2) includes a drive unit (21) mounted on the frame (1), and the drive unit (21) is connected to a vacuum adsorption fixing table (22). The image acquisition module (3) includes a mounting cover (31) mounted on a frame (1). At least two sets of shooting units (32) are installed inside the mounting cover (31). At least one set of shooting units (32) faces the front of the display screen to be inspected, and at least one set of shooting units (32) faces the side of the display screen to be inspected. The image acquisition module (3) also includes two planar reflectors (33) disposed on the side of the display screen to be inspected.

2. The fully automatic display screen surface defect detection device according to claim 1, characterized in that, The conveying and positioning module (2) also includes a pre-alignment mechanism (23), which is located upstream of the detection station and includes a pair of alignment blocks (231) that can move toward or away from each other.

3. The fully automatic display screen surface defect detection device according to claim 2, characterized in that, The centering block (231) has an elastic flexible pad on the side facing the screen.

4. The fully automatic display screen surface defect detection device according to claim 1, characterized in that, The vacuum adsorption fixing platform (22) has a partitioned structure forming multiple independent air chambers, and each independent air chamber is connected to a control valve that can be independently turned on and off.

5. The fully automatic display screen surface defect detection device according to claim 4, characterized in that, The surface of the vacuum adsorption fixing stage (22) is covered with a removable porous flexible pad.

6. The fully automatic surface defect detection device for a display screen according to claim 1, characterized in that, The mounting cover (31) is placed on the conveying and positioning module (2), and the mounting cover (31) has a feed inlet (311).

7. The fully automatic display screen surface defect detection device according to claim 1, characterized in that, The shooting unit (32) includes; Mounting base (321) includes a base plate (3211) and a support plate (3212) fixedly mounted on the upper surface of the base plate (3211). The camera (322) is mounted at an adjustable angle on the support plate (3212).

8. The fully automatic display screen surface defect detection device according to claim 7, characterized in that, A lifting mechanism (34) is installed on the lower end face of the imaging unit (32) facing the front of the display screen to be inspected. The lifting mechanism (34) includes: An arched frame (341) is installed on the frame (1). The lower mounting base (342) is fixedly connected to the upper end face of the arched frame (341), and a lower guide rail (3421) is provided on its upper end face. A set of parallel sliding blocks (3422) are slidably connected to the lower guide rail (3421). The upper mounting base (343) is located directly above the lower mounting base (342). Its upper end face is fixedly connected to the imaging unit (32) facing the front of the display screen to be inspected. Its lower end face is provided with an upper guide rail (3431). The upper guide rail (3431) is slidably connected to a set of parallel upper sliding blocks (3432). The lower sliding block (3422) and the upper sliding block (3432) are connected by at least one set of cross-arranged lifting rods (344). The two lifting rods (344) in the same set are rotatably connected at the cross position, and the two ends of each lifting rod (344) are rotatably connected to the upper sliding block (3432) and the lower sliding block (3422) respectively. A double-threaded rod (345) is horizontally arranged and passes through the two upper sliding blocks (3432). The double-threaded rod (345) has two reverse threads along its middle section towards both ends. The two threads are respectively threaded to the two upper sliding blocks (3432) so that the two upper sliding blocks (3432) can move closer to each other or further away from each other.

9. The fully automatic display screen surface defect detection device according to claim 8, characterized in that, Each of the planar reflectors (33) is mounted on a radial linear slide (331), and the driving direction of each radial linear slide is directed toward the center of the detection station.

10. The fully automatic display screen surface defect detection device according to any one of claims 1-9, characterized in that, The frame (1) is also equipped with a vibration isolation base (4) to reduce the impact of external vibration on the detection.

Images