Auxiliary edge inspection device and edge inspection method for polarizing plate automatic optical inspection machine

Abstract

The present invention discloses an auxiliary edge patrol device for an automated optical inspection machine for polarizing plates. The device comprises an image processing module, two movable robots, a U-shaped bracket, an edge patrol camera, an LED light source for edge patrol, and a limit sensor. The U-shaped brackets, located on either side of the polarizing plate reel, are connected to the axis arms of the movable robots and move synchronously with them. The edge patrol camera and the LED light source are fixed to either side of the U-shaped bracket, with the line connecting the camera and the LED light source perpendicular to the central axis of the U-shaped bracket. The limit sensor is mounted on the U-shaped bracket and located on the same side as the edge patrol camera. As an auxiliary mechanism of the automated optical inspection machine, the edge patrol device avoids width errors caused by abnormal waveforms in the automated optical inspection machine's cameras as the machine opens and closes, resulting in higher stability.

Description

Technical Field

[0001] The invention relates to an auxiliary edge inspection device and an edge inspection method for an automatic optical inspection machine for polarizing plates, and belongs to the technical field of optical inspection of polarizing plates. Background Art

[0002] Polarizing plates are mainly composed of a layer of polyvinyl alcohol film (PVA film or polarizer), two layers of triacetyl cellulose film (TAC film) and a protective film, which are then coated with a pressure-sensitive adhesive with a release film. Due to the different polarizer widths required by the polarizing plate production process for different product structures, when laminating the polarizer and the two layers of triacetyl cellulose film, there may be different edge combination lamination methods, that is, the embossed edge of the triacetyl cellulose film is attached to the outside of the polarizer, such as Figure 1a As shown, or a triacetate cellulose film embossed edge is attached to the inside of the polarizer, as shown Figure 1b As shown in the figure, the warping and quality of the white edge of the polarizing plate will be affected to a certain extent after the three-layer film is attached with the release film and the protective film.

[0003] Most polarizing plate manufacturers use automatic optical inspection machines to monitor the defect status of the pre-process roll materials and inkjet mark the defective dots. However, different combinations of polarizers and triacetate cellulose film will affect the edge inspection method of the automatic optical inspection machine, thereby affecting the average defect count and inkjet rate of the roll materials, causing the roll materials that are actually good to be judged as defective. More importantly, different edge inspection methods will cause the actual detected amplitude to be inconsistent with the actual width. When the edge needs to be flashed due to poor dot defect conditions, it may result in the defect being unable to be flashed, causing the entire roll of polarizing plate to be scrapped.

[0004] At present, automatic optical inspection machines generally use three methods to patrol edges: (1) The edge point is found by the grayscale signal difference between the polarizer and the embossed edge through the defect detection camera of the automatic optical inspection machine; (2) The black polarizer and the white embossed edge are detected by a light-transmitting sensor, and the position of the mobile robot is determined by the different light transmittance values ​​of the polarizer and the embossed edge, thereby confirming the edge of the polarizer; (3) An external fixed patrol camera is used to detect polarizers. Due to the limitations of the commonly used width and the field of view of the camera and the light source, the fixed patrol camera is generally far away from the film surface.

[0005] When using a camera for edge inspection, if the camera edge signal is abnormal, it may cause the entire detection width to be incorrect. At the same time, since the polarized light and the thick embossed edge may have slightly different signals under the background grayscale, it may cause edge inspection abnormalities. When using a light-transmitting sensor for detection, the polarized light and the white edge must be detected simultaneously. If the white edge is warped, the sensor detection value is incorrect, which will also cause edge inspection abnormalities. At the same time, if the product without white edges after striping is coated, the automatic optical inspection machine cannot be turned on. Using a fixed camera for edge inspection is more stable, but because the distance between the camera and the film surface is long, it can only detect the edge of the polarized light and cannot identify the situation where the embossed edge of the triacetate cellulose film is attached to the polarized light, which will cause the automatic optical inspection machine to detect an excessive number of defects. Therefore, although the current automatic optical inspection machine uses the above three methods for edge serpentine, the internal settings mostly use a fixed edge inspection method, directly blocking 10~20mm of the effective polarizing plate width on the left and right edges. This will inevitably cause edge defects to be blocked as well. Summary of the Invention

[0006] Purpose: In order to overcome the shortcomings of the existing edge inspection technology, the present invention provides an auxiliary edge inspection device and an edge inspection method for an automatic optical inspection machine for polarizing plates, which can accurately determine the effective edge and width of the polarizing plates, avoid the average defect count explosion or insufficient inkjet rate due to poor edge conditions, and thus affect the quality of the polarizing plates.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An auxiliary edge inspection device for an automatic optical inspection machine for polarizing plates, comprising an image processing module and two movable robots, a U-shaped bracket, an edge inspection camera, an edge inspection LED light source, and a limit sensor;

[0009] The U-shaped bracket is connected to the shaft arm of the movable robot and moves synchronously with the movable robot; two U-shaped brackets are located on both sides of the polarizing plate reel;

[0010] The border patrol camera and the border patrol LED light source are respectively fixed on both sides of the U-shaped bracket, and the line connecting the border patrol camera and the border patrol LED light source is perpendicular to the central axis of the U-shaped bracket; the limit sensor is installed on the U-shaped bracket and is located on the same side as the border patrol camera;

[0011] The edge patrol camera is connected to the image processing module, and the movable robot, the image processing module, the limit sensor and the processing system of the automatic optical inspection machine are connected.

[0012] Furthermore, the edge patrol camera and the edge patrol LED light source are located on both sides of the white edge of the polarizing plate.

[0013] Furthermore, the auxiliary edge patrol device is arranged in front of the automatic optical inspection machine, with the moving direction of the polarizing film as the forward direction.

[0014] Furthermore, the mechanical origin of the U-shaped bracket is the same as the mechanical origin of the automatic optical inspection machine.

[0015] A method for edge inspection of an auxiliary edge inspection device of an automatic optical inspection machine for polarizing plates, comprising the following steps:

[0016] After the automatic optical inspection machine is started, the U-shaped bracket, driven by a mobile robot, moves to the inside of the polarizing plate to inspect the edge. After 1 to 3 inward movements to detect and confirm the approximate edge position, the image processing module obtains the exact edge position and sends the polarizing plate edge coordinates on both sides to the processing system of the automatic optical inspection machine.

[0017] The automatic optical inspection machine performs edge patrol according to the received polarizing plate edge coordinates and outputs them to the automatic optical inspection machine detection interface to ensure the width accuracy of the polarizing plate.

[0018] Furthermore, the edge position is determined based on the position of the polarizer in the polarizing plate and the embossed edge of the triacetylcellulose film, and the process is as follows:

[0019] The orthogonal plate in the edge patrol camera and the polarized photons of the polarizer form an orthogonal dark state. The edge patrol threshold is set to 10~40gv. The junction of light and dark is the position of the polarized photons, which is displayed vertically in a certain color on the display interface of the image processing module.

[0020] Furthermore, the process of confirming the position of the embossed edge of the triacetyl cellulose film is as follows:

[0021] The embossed edge image threshold obtained by the edge patrol camera is used, and different expansion thresholds are set to perform point filtering and stretching to form a linear embossed edge boundary, which is displayed vertically in a certain color on the display interface of the image processing module.

[0022] Furthermore, the embossing image threshold is 10-60 gv, and the expansion threshold is 60-200 gv.

[0023] Furthermore, according to the comparison of the transverse coordinate positions of the embossed edges of the polarizer and the triacetyl cellulose film, the inner one is the edge of the polarizer.

[0024] Furthermore, the image processing module saves a side image at intervals to record edge detection and abnormal conditions of the polarizer.

[0025] Beneficial effects: The auxiliary edge patrol device of the polarizing plate automatic optical inspection machine provided by the present invention can simultaneously process polarized light and the embossed edge image of the triacetyl cellulose film, more accurately record the effective width of the polarizing plate, and effectively detect the edge of the polarizing film in different states by adjusting the threshold parameters or the LED light source; as the automatic optical inspection machine is turned on and off, the device will not cause width errors due to abnormal waveforms of the automatic optical inspection machine camera, and has higher stability; the device can record the side image of the polarizing plate to query abnormal conditions of the side.

[0026] The edge inspection method of the present invention reduces the distance between the camera and the light source and the polarizing plate film surface to capture a high-resolution edge image. The polarizing plate edge is processed by an image algorithm to find the exact position of the embossed edge of the triacetyl cellulose film and the polarized edge. The lateral position of the polarizing plate edges on both sides is confirmed by coordinate comparison and fed back to the automatic optical inspection machine for edge inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1a Schematic diagram of the embossed edge of triacetyl cellulose film attached to the outside of the polarizer;

[0028] Figure 1b Schematic diagram of the lace edge of triacetate cellulose film attached to the inner side of the polarizer;

[0029] Figure 2 Schematic diagram of the structure and installation of the auxiliary border patrol device of the present invention;

[0030] Figure 2 Chinese symbols: 1. Camera and light source of the automatic optical inspection machine, 2. Processing system of the automatic optical inspection machine, 3. Mobile robot, 4. U-shaped bracket, 5. Edge patrol camera, 6. Edge patrol LED light source, 7. Limit sensor, 8. Image processing module, 9. Polarizing plate roll, 10. Unwinding roller, 11. Roller 1, 12. Roller 2, 13. Rewinding roller.

[0031] Figures 3a-3d Schematic diagram of the edge inspection principle of embossing triacetate cellulose film:

[0032] Figure 3a It is the original embossed form of the edge of the triacetyl cellulose film;

[0033] Figure 3b The edge of the triacetate cellulose film is embossed and stretched against a gray background;

[0034] Figure 3c The edges of the triacetate cellulose film are embossed and stretched longitudinally into short lines;

[0035] Figure 3d The edge embossing of the triacetate cellulose film is done by expanding and stretching the short lines into long line segments;

[0036] Figure 4 This is a schematic diagram of the automatic optical inspection machine's patrol snake. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 2 As shown, an auxiliary edge inspection device for an automated optical inspection machine for polarizers primarily includes the following equipment and materials: an automated optical inspection machine camera and light source 1, an automated optical inspection machine processing system 2, a mobile robot 3, a U-shaped bracket 4, an edge inspection camera 5, an edge inspection LED light source 6, a limit sensor 7, and an image processing module 8. This device can be used in PVA stations, PSA stations, RK stations, and other stations where automated optical inspection machines are required to detect polarizer defects.

[0039] The polarizing plate roll 9 is produced in a roll-to-roll manner at each station, starting from the unwinding roller 10, passing through roller 11 and roller 2 12, and ending at the rewinding roller 13. The production speed is 10-40 m / min. The polarizing plate is in the state of polarizing film plus two layers of triacetyl cellulose film, or polarizing film plus two layers of triacetyl cellulose film plus a release film, or polarizing film plus two layers of triacetyl cellulose film plus a release film and a protective film. The embossed edge of the triacetyl cellulose film has a longitudinal multi-row diamond-shaped dot embossing pattern, such as Figure 3a To ensure smooth detection of the polarizing plate edge, the distance between roller 11 and roller 2 12 is between 300 and 1000 mm; the auxiliary edge patrol device is provided on both sides of the polarizing plate between roller 11 and roller 2 12.

[0040] The movable coverage range of the movable robot 3 of the device is 1330~2500mm, the border patrol camera 5 and the border patrol LED light source are fixed on the U-shaped bracket 4, the border patrol camera 5 has a resolution of 4K or 8K, and the border patrol LED light source 6 is a brightness-adjustable LED lamp with a brightness adjustment range of 150,000~35,000 lumens; the limit sensor 7 is triggered by a through-type light-transmitting sensor to prevent the U-shaped bracket of the auxiliary border patrol device from moving inward and colliding with the polarizing plate; the image processing module 8 is used to perform signal analysis processing on the grayscale image obtained from the border patrol camera 5, and save the edge coordinate position and the side detection image to obtain the effective width of the polarizing plate.

[0041] The film materials at different stations, as well as the warping conditions of the film materials and the different transmittance of the film materials to the light source, will lead to different software and hardware settings of the auxiliary edge patrol device of the automatic optical inspection machine, which will in turn affect the image clarity and edge patrol position accuracy of the auxiliary edge patrol device. The following is an explanation with a specific embodiment.

[0042] Example 1

[0043] During production at the front-end extension station, when the polarizer is located on the inner side of the embossed edge of the triacetate film, the specific edge inspection process is as follows, taking the side edge inspection device as an example:

[0044] Step 1: Before polarizing coil production begins, the mobile robot is positioned at its mechanical origin, aligned with the origin of the automated optical inspection machine. When polarizing coil production begins, the automated optical inspection machine is turned on, and the arm of the mobile robot 3 begins to move, driving the U-shaped bracket 4. Once it confirms that the polarizer can be detected, it continues to move toward the inside of the polarizer, waiting for the limit sensor 7 to trigger before returning to the origin. After 1-3 trial moves, the approximate position of the polarizer edge is confirmed. Based on this approximate position, the robot is repositioned to the polarizer position and photographed.

[0045] Step 2: The image processing module 8 obtains the edge grayscale image from the edge patrol camera 5. By adjusting the edge patrol threshold of the polarizer, it is generally set to 10~40gv. In the orthogonal state, when the grayscale difference between the embossed edge of the triacetyl cellulose film in the bright state on the outside and the polarizer in the dark state is greater than a certain grayscale value, it can accurately detect the polarizer image. The grayscale difference is usually set at 30~80gv. After the image processing module 8 recognizes the side of the polarizer, it will be identified by a vertical line of a certain color. The vertical line color is green, red or blue. The horizontal coordinates of the vertical line position will be output to the display interface of the image processing module 8, and the button will light up to indicate that the edge of the polarizer has been detected. At the same time, the image processing module 8 starts to save the edge image for subsequent query, and saves an edge image every 1~10m.

[0046] Step 3: After the image processing module 8 confirms that the auxiliary edge patrol device has detected the polarizer, it searches for the image of the embossed edge of the triacetyl cellulose film in the frame inside the polarizer. The position of the inner frame will move with the position of the polarizer. The frame size range is adjustable and is generally set to 200×80mm. If the embossed edge pattern cannot be detected within the frame, the system defaults the horizontal coordinate of the embossed edge to 0. The image processing module 8 compares the horizontal coordinates of the embossed edge of the triacetyl cellulose film and the polarizer edge, and selects the larger value to be output to the processing system 2 of the automatic optical inspection machine for edge patrol.

[0047] Step 4: The image processing module 8 transmits the lateral coordinates of the polarized photons on both sides to the processing system 2 of the automatic optical inspection machine. When the polarized plate runs the distance from the edge inspection camera 5 to the automatic optical inspection machine, it automatically performs serpentine edge inspection. The edge inspection status is as follows: Figure 4As shown in the figure, the width of polarizing plates constantly changes during production. The actual width displayed by the AOC is the value initially detected. To obtain the exact width, the AOC's processing system 2 obtains the stored batch image from the image processing module 8, amplifies the image, and autonomously calculates the width based on the coordinates.

[0048] Example 2

[0049] During production at the front-end extension station, when the polarizer is located outside the embossed edge of the triacetate film, the specific edge inspection process is as follows, taking the side edge inspection device as an example:

[0050] Step 1: As in Example 1, after confirming that the edge patrol device has detected polarized light, the image processing module 8 searches for an image of the embossed edge of triacetylcellulose film within the block diagram inside the polarized light. Typically, the embossed edge of triacetylcellulose film is embossed with multiple rows of diamond or dot patterns. When the edge patrol camera 5 detects the embossed edge pattern, the image processing module 8 extracts the embossed edge black dots using a set embossing threshold, typically between 20 and 60 gv.

[0051] Step 2: When the embossed pattern is detected, Figure 3a The original embossed edge dot image shown is filtered, and the dot-shaped embossed edge of the triacetate cellulose film is converted into a dot-shaped embossed edge under a background of 50~80gv to filter edge impurities and appropriately stretch the dot pattern. The expansion threshold of the dot embossing is generally set to 60~120gv. The stretching effect is as follows Figure 3b shown.

[0052] Step 3: After obtaining the properly stretched dot embossed pattern, it is subjected to linear filtering using 1 to 3 times of Gaussian filtering algorithm, continuous smoothing, and contrast enhancement, and the dot pattern is longitudinally stretched into short lines, such as Figure 3c shown.

[0053] Step 4: After obtaining the short lines, expand them into long lines through the expansion algorithm. The innermost long line position is the embossing edge position. Figure 3d As shown in the figure, once the image processing module 8 identifies the embossed edge, it will be identified by a vertical line of a certain color, such as green, red, or blue. The horizontal coordinates of the vertical line's position are output on the image processing module 8 display interface, and a lighted button indicates that the embossed edge of the triacetate cellulose film has been detected. At the same time, the image processing module 8 begins saving edge images at intervals of 1 to 10 meters for subsequent query.

[0054] Step 5: After obtaining the transverse coordinates of the embossed edge of the triacetylcellulose film, the image processing module 8 compares the transverse coordinates of the embossed edge of the triacetylcellulose film and the polarized edge, and selects the larger value to be output to the processing system 2 of the automatic optical inspection machine for edge inspection.

[0055] Step 6: The image processing module 8 transmits the horizontal coordinates of the embossed edges on both sides to the processing system 2 of the automatic optical inspection machine. When the polarizing plate runs the distance from the edge inspection camera 5 to the automatic optical inspection machine, it automatically performs serpentine edge inspection. The edge inspection status is as follows: Figure 4 shown.

[0056] Example 3

[0057] During production at the front-end process extension station, when there are indentations or uneven coating on the inner side of the polarizer, the specific inspection process is as follows, taking the side edge inspection device as an example:

[0058] Step 1: As in Example 1, after confirming that the edge patrol device has detected polarized light, the image processing module 8 searches for an image of the embossed edge of the triacetyl cellulose film in the frame diagram with the polarized light i on the inner side. If a longitudinal continuous embossing mark or poor coating image appears in the image processing frame diagram, the image will be misidentified as the embossed edge of the triacetyl cellulose film.

[0059] Step 2: When the image processing module 8 identifies an erroneously detected embossed edge, it will be identified by a vertical line of a certain color, such as green, red, or blue. The horizontal coordinates of the vertical line's position are displayed on the image processing module 8's display interface, and a lighted button indicates that the embossed edge of the triacetate cellulose film has been detected. Simultaneously, the image processing module 8 begins saving edge images at intervals of 1 to 10 meters for subsequent query.

[0060] Step 3. After the processing system 2 of the automatic optical inspection machine obtains the position coordinates of the indentation or uneven coating, it will compare the displayed width with the set minimum detection width. The minimum detection width is the minimum width value set by the automatic optical inspection machine to avoid edge inspection errors and prevent the effective area from not being detected. It is generally the width required for the final cutting into sheets; if the width of the indentation or uneven coating is smaller than the set minimum detection width, the automatic optical inspection machine will pop up an error message to indicate the width error and remind personnel to handle it.

[0061] Step 4. If the width of the indentation or uneven coating is greater than the set minimum detection width, the automatic optical inspection machine will perform a serpentine inspection along the edge of the indentation or uneven coating. At this time, the width of the polarizing plate being inspected is smaller than the actual width, but because the side defects are shielded, the actual effective width of the polarizing plate is obtained.

[0062] Example 4

[0063] During production at the front-end coating station or protective film replacement station, the state of the original reverse-attached release film and protective film will also be encountered, which will also have a certain impact on edge detection. When the polarizing film state is the original reverse-attached release film or the original reverse-attached release film followed by the protective film, taking the operation of the side edge patrol device as an example, the specific edge patrol process is as follows:

[0064] 4.1 The polarizer is located on the inner side of the embossed edge of the triacetate cellulose film;

[0065] As in Example 1, since one or two layers of film material are added to the original reflection, the edge grayscale image obtained by the image processing module 8 from the edge patrol camera 5 will become darker. At this time, the edge patrol threshold of the polarized photon needs to be appropriately reduced, generally set to 10~25gv, or the detection of the polarized photon edge can be enhanced by increasing the brightness of the edge patrol LED light source 6.

[0066] 4.2 The polarizer is located outside the embossed edge of the triacetate cellulose film;

[0067] As in Example 2, due to the addition of one or two layers of film material, the edge grayscale image obtained by the image processing module 8 from the edge patrol camera 5 will become darker. At this time, the edge patrol threshold of the embossed edge of the triacetate cellulose film needs to be appropriately reduced, generally set to 10~25gv, or the detection of the embossed edge of the triacetate cellulose film can be enhanced by increasing the brightness of the edge patrol LED light source 6; the point embossed edge obtained from the edge grayscale will become smaller. At this time, the tensile expansion threshold of the point embossed edge of the triacetate cellulose film needs to be appropriately increased, generally set to 100~200gv.

[0068] 4.3 The edge image of the longitudinal continuous release film or protective film is mistakenly identified as the embossed edge of triacetate cellulose film;

[0069] As in Example 3, since one or two layers of film material are added to the original, the release film or protective film may be offset, and a longitudinal continuous release film or protective film edge image will appear in the image processing frame diagram, and the image will be mistakenly judged as a triacetate cellulose film embossed edge; if an oblique continuous release film or protective film edge image appears in the image processing frame diagram, the image will not be judged as an embossed edge, but the automatic optical inspection machine will show a number of side defects to remind personnel to handle it.

[0070] After the processing system 2 of the automatic optical inspection machine obtains the position coordinates of the edge of the longitudinal continuous release film or protective film, it will compare the displayed width with the set minimum detection width. If the edge width of the release film or protective film is less than the set minimum detection width, the automatic optical inspection machine will pop up an error message to indicate the width error and remind personnel to handle it.

[0071] If the width of the edge of the release film or protective film is greater than the set minimum detection width, the automatic optical inspection machine will perform a serpentine inspection along the edge of the release film or protective film. At this time, the width of the polarizing plate is smaller than the actual width, but because the side defects are shielded, the actual effective width of the polarizing plate is obtained.

[0072] In this invention, the polarizer and triacetyl cellulose film embossing process are photographed and image processed. By comparing relative coordinates and saving the corresponding polarizer edge image, the accurate polarizer edge position is obtained and output to an automated optical inspection machine. The automated optical inspection machine records each width change based on the film's serpentine shape and defect distribution image, thus ensuring traceability of the polarizer's true width.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary edge inspection device for an automatic optical inspection machine for polarizing plates, characterized in that: It includes an image processing module and two movable robots, a U-shaped bracket, a patrol camera, a patrol LED light source, and a limit sensor. The U-shaped bracket is connected to the shaft arm of the movable robot and moves synchronously with the movable robot; two U-shaped brackets are located on both sides of the polarizing plate reel; The border patrol camera and the border patrol LED light source are respectively fixed on both sides of the U-shaped bracket, and the line connecting the border patrol camera and the border patrol LED light source is perpendicular to the central axis of the U-shaped bracket; the limit sensor is installed on the U-shaped bracket and is located on the same side as the border patrol camera; The edge patrol camera is connected to the image processing module, and the movable robot, the image processing module, the limit sensor and the processing system of the automatic optical inspection machine are connected; The method for performing edge inspection using the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine includes the following steps: After the automatic optical inspection machine is started, the U-shaped bracket, driven by a mobile robot, moves to the inside of the polarizing plate to inspect the edge. After 1 to 3 inward movements to detect and confirm the approximate edge position, the image processing module obtains the exact edge position and sends the polarizing plate edge coordinates on both sides to the processing system of the automatic optical inspection machine. The automatic optical inspection machine performs edge inspection according to the received polarizing plate edge coordinates and outputs them to the detection interface of the automatic optical inspection machine to ensure the width accuracy of the polarizing plate; The edge position is determined based on the position of the polarizer in the polarizing plate and the embossed edge of the triacetylcellulose film. The process is as follows: The orthogonal plate in the edge patrol camera and the polarized photons of the polarizer form an orthogonal dark state. The edge patrol threshold is set to 10~40gv. The junction of light and dark is the position of the polarized photons, which is displayed vertically in a certain color on the display interface of the image processing module.

2. The auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 1, characterized in that: The edge patrol camera and the edge patrol LED light source are located on both sides of the white edge of the polarizing plate.

3. The auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 1, characterized in that: The auxiliary edge patrol device is arranged in front of the automatic optical inspection machine, with the moving direction of the polarizing film as the forward direction.

4. The auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 1, characterized in that: The mechanical origin of the U-shaped bracket is the same as the mechanical origin of the automatic optical inspection machine.

5. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to any one of claims 1 to 4, characterized in that: The process includes the following: After the automatic optical inspection machine is started, the U-shaped bracket, driven by a mobile robot, moves to the inside of the polarizing plate to inspect the edge. After 1 to 3 inward movements to detect and confirm the approximate edge position, the image processing module obtains the exact edge position and sends the polarizing plate edge coordinates on both sides to the processing system of the automatic optical inspection machine. The automatic optical inspection machine performs edge patrol according to the received polarizing plate edge coordinates and outputs them to the automatic optical inspection machine detection interface to ensure the width accuracy of the polarizing plate.

6. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 5, characterized in that: The edge position is determined based on the position of the polarizer in the polarizing plate and the embossed edge of the triacetylcellulose film. The process is as follows: The orthogonal plate in the edge patrol camera and the polarized photons of the polarizer form an orthogonal dark state. The edge patrol threshold is set to 10~40gv. The junction of light and dark is the position of the polarized photons, which is displayed vertically in a certain color on the display interface of the image processing module.

7. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 6, characterized in that: The process of confirming the embossed edge position of triacetate cellulose film is as follows: The embossed edge image threshold obtained by the edge patrol camera is used, and different expansion thresholds are set to perform point filtering and stretching to form a linear embossed edge boundary, which is displayed vertically in a certain color on the display interface of the image processing module.

8. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 7, characterized in that: The embossing image threshold is 10-60 gv, and the expansion threshold is 60-200 gv.

9. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 6, characterized in that: According to the comparison of the transverse coordinate positions of the embossed edges of the polarizer and the triacetate cellulose film, the inner one is the edge of the polarizer.

10. The edge inspection method of the auxiliary edge inspection device of the polarizing plate automatic optical inspection machine according to claim 5, characterized in that: The image processing module saves a side image at intervals to record the edge detection and abnormal conditions of the polarizer.

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