A screen surface area defect detection device with identification function

Abstract

The utility model relates to a kind of screen surface area defect detection devices with identification function, including rack, screen conveying mechanism, defect marking mechanism, detection camera and controller;Screen conveying mechanism, defect marking mechanism, detection camera are all installed on rack, screen conveying mechanism has the screen conveying section moving along x-axis direction;Defect marking mechanism includes identification component and the power drive mechanism that identification component can be driven along y-axis direction movement and along z-axis direction lift;Detection camera, identification component are set in the directly above of screen conveying section one before and one after, and the camera head of detection camera is towards screen conveying section;Screen conveying mechanism, detection camera, power drive mechanism are respectively with the output end electric connection of corresponding controller.This screen surface area defect detection device can identify the defect after detecting the surface defect of the screen to be detected, facilitate quality inspection personnel to carry out quick verification and recheck to detection result, significantly reduce the loss caused by misjudgment.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, specifically to a screen surface area defect detection device with marking function. Background Technology

[0002] With the rapid development of display technology, liquid crystal displays (LCDs), organic light-emitting diode displays (OLEDs), and various touch screens have been widely used in consumer electronics, industrial control, medical equipment, and other fields. Consumers have increasingly higher requirements for the display quality of screens, and any minor surface defects, such as scratches, dirt, spots, or cracks, can affect the user's visual experience and product yield.

[0003] Traditional inspection methods heavily rely on the visual inspection and experience of quality inspectors, resulting in low efficiency, high labor intensity, susceptibility to subjective factors, and inconsistent inspection standards. Currently, the inspection of screen surface defects is gradually transitioning from traditional manual inspection to automated and intelligent machine vision inspection. Screen surface defect inspection (e.g., detecting dirt and other defects on the surface of displays and touchscreens) is generally performed using inspection devices with image recognition capabilities. However, these devices can only determine whether a screen has a defect and remove it from the production line; they do not have the function of identifying the defect for human judgment (including product assessment and accuracy assessment). When the equipment determines that a screen has a defect and removes it, quality inspectors cannot intuitively and quickly understand what kind of defect the device has identified and where it is located. This makes it difficult for quality inspectors to determine whether the inspection accurately identified a real defect or resulted in a false positive. False positives during the inspection process can easily lead to the scrapping of a large number of good products, causing significant economic losses. Utility Model Content

[0004] The technical problem this invention aims to solve is to provide a screen surface defect detection device with marking function. This device can mark the surface defects of the screen under inspection after detection, facilitating rapid verification and review of the test results by quality inspectors and significantly reducing losses caused by false detections. The technical solution adopted is as follows: A screen surface defect detection device with marking function is characterized by comprising a frame, a screen conveying mechanism, a defect marking mechanism, a detection camera, and a controller; the screen conveying mechanism, the defect marking mechanism, and the detection camera are all mounted on the frame; the screen conveying mechanism has a screen conveying section that moves along the x-axis; the defect marking mechanism includes a marking component and a power drive mechanism capable of driving the marking component to move along the y-axis and to rise and fall along the z-axis; the detection camera and the marking component are positioned one in front of the other directly above the screen conveying section, with the camera lens of the detection camera facing the screen conveying section; the screen conveying mechanism, the detection camera, and the power drive mechanism are electrically connected to the corresponding output terminals of the controller.

[0005] During operation, the screen to be inspected is placed on the screen conveying section of the screen conveying mechanism. The controller controls the screen conveying section to move the screen to be inspected along the x-axis. During the movement of the screen to be inspected, the controller scans the surface of the screen to be inspected using the camera of the detection camera to synthesize an image, and then identifies the defects on the surface of the screen through the image, and gives the coordinates of the nth defect (hereinafter referred to as defect n) as (x... n y n Since the camera of the inspection camera and the defect marking mechanism share the same screen conveying mechanism, and the two have a definite relative position (the defect marking mechanism is located in a fixed position behind the inspection camera, differing from it only by a distance x in the front-back direction), the inspection camera's camera is used for inspection. L Therefore, a common reference coordinate system can be used. For example, under this reference coordinate system, the camera of the detection camera identifies the coordinates (x, y, y) of the defect n. n y n After that, the controller can directly obtain the coordinate position (x, y) of the defect n in the marking system through a simple coordinate transformation. n +x L y n The entire process eliminates the need for positioning the object to be inspected, removing positioning components and simplifying the equipment structure; subsequently, the controller determines the location of the defect n based on its coordinates (x, y, y). n +x L y n The control panel conveying mechanism moves the panel to be inspected along the x-axis until the x-coordinate of the defect n is aligned with the marking component. Then, the control power drive mechanism moves the marking component along the y-axis until it is positioned above and to one side of the defect n. n From the position of -w / 2), move down along the z-axis until it contacts the surface of the screen to be inspected, and then move along the y-axis to (y n At position +w / 2), use the marking component to draw a marking line of length w on the surface of the screen to be inspected to mark the position of the defect n.

[0006] As a preferred embodiment of this utility model, the screen conveying mechanism includes multiple conveying rollers arranged from front to back and rotating in the same direction. Specifically, the multiple conveying rollers can rotate synchronously in the forward or reverse direction under the drive of a conveying drive mechanism (the drive mechanism can be composed of a drive motor and multiple transmission belt mechanisms), driving the screen to be inspected on it to move along the x-axis direction.

[0007] To accommodate the movement of the screen under inspection, as a preferred embodiment of this invention, the inspection camera is a line scan camera. Specifically, the field of view of the line scan camera is a line extending along the y-axis. During the movement of the screen under inspection, the line scan camera scans the surface of the screen under inspection to create a composite image.

[0008] As a preferred embodiment of this utility model, the marking component includes two marking pens arranged side by side along the x-axis, with the pen tips facing downwards. Thus, after detecting a surface defect in the screen to be inspected, the pen tips of the two marking pens can be used to draw a double line of length w on the surface of the screen, so that the defect n is located between the double lines and is thus marked.

[0009] As a further preferred embodiment of this utility model, the distance between the tips of the two marking pens is 0.3 to 1 cm.

[0010] As a further preferred embodiment of this utility model, the marking pen is an oil-based pen or a paint pen.

[0011] In a preferred embodiment of this invention, the power drive mechanism includes a multi-axis high-precision electrically controlled displacement stage and a clamp. The multi-axis high-precision electrically controlled displacement stage is mounted on the frame, and the clamp is mounted on the displacement platform of the multi-axis high-precision electrically controlled displacement stage. The marking component is held and fixed by the clamp. During operation, the multi-axis high-precision electrically controlled displacement stage drives the clamp and the marking component (such as two marking pens) thereon to move along the y-axis and move up and down along the z-axis.

[0012] In another preferred embodiment of this utility model, the power drive mechanism includes a clamp, a Y-axis translation mechanism, and a Z-axis lifting mechanism. The Y-axis translation mechanism is mounted on the frame, the Z-axis lifting mechanism is mounted on the power output end of the Y-axis translation mechanism, and the clamp is mounted on the power output end of the Z-axis lifting mechanism. The marking component is clamped and fixed by the clamp. The Y-axis translation mechanism and the Z-axis lifting mechanism are electrically connected to the corresponding output ends of the controller. With this structure, the clamp can be used to clamp and fix the marking component (such as two marking pens). The controller can drive the Z-axis lifting mechanism and the marking component to translate along the Y-axis direction via the Y-axis translation mechanism, and can drive the marking component to move along the Z-axis direction via the Z-axis lifting mechanism.

[0013] As a further preferred embodiment of this utility model, the y-axis translation mechanism includes a first rodless cylinder and a translation seat. The cylinder body of the first rodless cylinder is mounted on the frame and arranged along the y-axis direction, and the translation seat is mounted on the slider of the first rodless cylinder. The z-axis lifting mechanism includes a second rodless cylinder. The cylinder body of the second rodless cylinder is mounted on the translation seat and arranged along the z-axis direction, and the clamp is mounted on the slider of the second rodless cylinder. During operation, the translation seat, the second rodless cylinder, the clamp, and the marking component can be driven to translate along the y-axis direction by the first rodless cylinder, and the clamp and the marking component can be driven to move along the z-axis direction by the second rodless cylinder.

[0014] Compared with the prior art, this utility model has the following advantages: (1) This screen surface defect detection device, through the cooperation between the screen conveying mechanism, the defect marking mechanism, the detection camera and the controller, can mark the surface defects of the screen to be inspected after detection, so that quality inspectors can quickly verify and review the test results, and significantly reduce the losses caused by false detection. (2) This screen surface defect detection device can set the defect marking mechanism and the detection camera one after the other directly above the screen conveying mechanism. Moreover, the entire process does not require positioning of the screen to be inspected, eliminating the need for positioning components. The structure is simple and compact, which can effectively reduce the space occupied by the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the screen surface area defect detection device according to a preferred embodiment of the present invention.

[0016] Figure 2 yes Figure 1 The diagram shows the structure of the defect marking mechanism in the screen surface area defect detection device. Detailed Implementation

[0017] like Figures 1-2 As shown, this screen surface defect detection device with marking function includes a frame (not shown in the figure), a screen conveying mechanism 1, a defect marking mechanism 2, a line scan camera 3, and a controller (not shown in the figure). The screen conveying mechanism 1, the defect marking mechanism 2, and the line scan camera 3 are all mounted on the frame. The screen conveying mechanism 1 has a screen conveying section that moves along the x-axis direction 10. The defect marking mechanism 2 includes a marking component 21 and a power drive mechanism 22 that can drive the marking component 21 to move along the y-axis direction 20 and to rise and fall along the z-axis direction 30. The line scan camera 3 and the marking component 21 are positioned one in front of the other directly above the screen conveying section, and the camera of the line scan camera 3 faces the screen conveying section. The screen conveying mechanism 1, the line scan camera 3, and the power drive mechanism 22 are electrically connected to the corresponding output terminals of the controller.

[0018] In this embodiment, the screen conveying mechanism 1 includes a plurality of conveying rollers 11 arranged from front to back and rotating in the same direction. Specifically, the plurality of conveying rollers 11 can rotate synchronously in the forward or reverse direction under the drive of a conveying drive mechanism (the conveying drive mechanism can be composed of a drive motor and a plurality of transmission belt mechanisms), driving the screen 50 to be inspected on it to move along the x-axis direction 10.

[0019] In this embodiment, the marking component 21 includes two marking pens 211 arranged side by side along the x-axis 10, with the pen tips of the marking pens 211 facing downwards; the distance between the pen tips of the two marking pens 211 is 0.3 to 1 cm. Specifically, the marking pens 211 can be oil-based pens or paint pens.

[0020] In this embodiment, the power drive mechanism 22 includes a multi-axis high-precision electronically controlled displacement stage 221 and a clamp 222. The clamp 222 is mounted on the displacement stage of the multi-axis high-precision electronically controlled displacement stage 221. Both marking pens 211 are clamped and fixed by the clamp 222. The multi-axis high-precision electronically controlled displacement stage 221 is used to drive the clamp 222 and the two marking pens 211 on it to move along the y-axis direction 20 and move up and down along the z-axis direction 30.

[0021] The working principle of this screen surface area defect detection device is briefly described below: During operation, the screen to be inspected 50 is placed on the screen conveying section of the screen conveying mechanism 1. The controller controls the screen conveying section to move the screen to be inspected 50 along the x-axis direction 10. During the movement of the screen to be inspected 50, the controller scans the surface of the screen to be inspected 50 to form a composite image through the camera of the line scan camera 3 (the field of view of the camera of the line scan camera 3 is a line extending along the y-axis). Then, the defects on the surface of the screen are identified through the image, and the coordinates of the nth defect (hereinafter referred to as defect n) are given as (x... n y n Since the camera of the line scan camera 3 and the defect marking mechanism 2 share the same screen conveying mechanism 1, and the two have a definite relative position (the defect marking mechanism 2 is located at a fixed position behind the line scan camera 3, differing only by a distance x in the front-to-back direction), L Therefore, a common reference coordinate system can be used. For example, under this reference coordinate system, the camera of the line scan camera 3 identifies the coordinates (x, y, y) of the defect n. n y n After that, the controller can directly obtain the coordinate position (x, y) of the defect n in the marking system through a simple coordinate transformation. n +x L y n The entire process eliminates the need for positioning the inspection screen 50, removing positioning components and simplifying the equipment structure; subsequently, the controller determines the location of the defect n based on its coordinates (x, y, y). n +xL y n The control panel conveying mechanism 1 moves the panel 50 to be inspected along the x-axis direction 10, aligning the x-coordinate of the defect n with the two marking pens 211. Then, the control power drive mechanism 22 drives the two marking pens 211 to move along the y-axis direction 20, moving them above the defect n on one side (y...). n At position -w / 2), move down along the z-axis until it contacts the surface of the screen body 50 to be inspected, and then move along the y-axis to (y n At position +w / 2), use two marking pens 211 to draw marking lines 210 of length w on the surface of the screen body 50 to be inspected, so that the defect n is located between the two lines and is marked.

[0022] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles of this utility model patent are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, they should all fall within the protection scope of this utility model.

Claims

1. A device for detecting surface area defects of a screen with marking function, characterized in that: The system includes a frame, a screen conveying mechanism, a defect marking mechanism, an inspection camera, and a controller. The screen conveying mechanism, defect marking mechanism, and inspection camera are all mounted on the frame. The screen conveying mechanism has a screen conveying section that moves along the x-axis. The defect marking mechanism includes a marking component and a power drive mechanism that can drive the marking component to move along the y-axis and move up and down along the z-axis. The inspection camera and marking component are positioned one in front of the other directly above the screen conveying section, with the camera lens of the inspection camera facing the screen conveying section. The screen conveying mechanism, inspection camera, and power drive mechanism are electrically connected to the corresponding output terminals of the controller.

2. The screen surface area defect detection device with marking function according to claim 1, characterized in that: The screen conveying mechanism includes multiple conveying rollers arranged from front to back and rotating in the same direction.

3. The screen surface area defect detection device with marking function according to claim 1, characterized in that: The detection camera is a line scan camera.

4. The screen surface area defect detection device with marking function according to claim 1, characterized in that: The marking component includes two marking pens arranged side by side along the x-axis, with the pen tips facing downwards.

5. The screen surface area defect detection device with marking function according to claim 4, characterized in that: The distance between the tips of the two marking pens is 0.3 to 1 cm.

6. The screen surface area defect detection device with marking function according to claim 4, characterized in that: The marking pen used is an oil-based pen or a paint pen.

7. A screen surface area defect detection device with marking function according to any one of claims 1-6, characterized in that: The power drive mechanism includes a multi-axis high-precision electrically controlled displacement stage and a clamp. The multi-axis high-precision electrically controlled displacement stage is mounted on the frame, and the clamp is mounted on the displacement stage of the multi-axis high-precision electrically controlled displacement stage. The marking component is clamped and fixed by the clamp.

8. A screen surface area defect detection device with marking function according to any one of claims 1-6, characterized in that: The power drive mechanism includes a clamp, a Y-axis translation mechanism, and a Z-axis lifting mechanism. The Y-axis translation mechanism is mounted on the frame, the Z-axis lifting mechanism is mounted on the power output end of the Y-axis translation mechanism, and the clamp is mounted on the power output end of the Z-axis lifting mechanism. The marking component is clamped and fixed by the clamp. The Y-axis translation mechanism and the Z-axis lifting mechanism are electrically connected to the corresponding output ends of the controller.

9. A screen surface area defect detection device with marking function according to claim 8, characterized in that: The y-axis translation mechanism includes a first rodless cylinder and a translation seat. The cylinder body of the first rodless cylinder is mounted on the frame and is arranged along the y-axis direction. The translation seat is mounted on the slider of the first rodless cylinder. The z-axis lifting mechanism includes a second rodless cylinder. The cylinder body of the second rodless cylinder is mounted on the translation seat and is arranged along the z-axis direction. The clamp is mounted on the slider of the second rodless cylinder.

Images