Liquid crystal panel hole area defect detection mechanism

Abstract

The utility model discloses a liquid crystal panel hole area defect detection mechanism, and belongs to the field of AOI (automatic optical inspection). The device comprises a rack and an image acquisition device installed on the rack, a point light source is arranged in the image acquisition device, the light emitting direction of the point light source is the same as the light emitting direction of the image acquisition device, a ring light source is arranged on the peripheral side of the image acquisition device, and the ring light source is arranged on the periphery of the image acquisition device. And the light emitting direction of the ring light source is the same as that of the image acquisition device. The detection accuracy and the detection efficiency can be effectively improved, the defect detection rate is guaranteed, and a guarantee is provided for functional testing of the liquid crystal panel.

Description

Technical Field

[0001] This application relates to the field of AOI automatic optical inspection, and particularly to a defect detection mechanism for the hole area of a liquid crystal panel. Background Art

[0002] With the continuous development of science and technology, mobile phones have become not only a necessity for people, but also people's requirements for the diversity of mobile phone functions are getting higher and higher. In terms of cameras, it has evolved from single cameras to dual cameras and now to triple cameras. Cameras also come in black and white and color, with wide-angle and telephoto combinations to achieve different performances of mobile phone cameras. Among them, black-and-white lenses can obtain better texture; in low-light or poor-light conditions, black-and-white lenses can help color lenses increase the light intake, making photos clearer; the inclusion of telephoto lenses can achieve better depth of field and bokeh effects; wide-angle lenses have a wide field of view and can capture wider scenes in cramped spaces. Thus, cameras have become an indispensable part of mobile phones to achieve diverse functions, and the detection of cameras has also become a topic that remains popular on mobile phone forums.

[0003] Among them, the hole area of the liquid crystal panel refers to the camera area. When detecting the hole area, it is necessary to detect defects such as cracks and rainbow patterns in the hole area of the liquid crystal panel to ensure the quality of the liquid crystal panel.

[0004] In existing detection methods, there are manual detection methods and equipment detection methods. Manual detection methods have problems such as being time-consuming, laborious, having low efficiency, a cumbersome process, strong subjectivity, being affected by factors such as personnel emotions, eyesight, environmental light, and inconsistent judgment criteria among different people's eyes. The equipment in equipment detection methods mainly uses line array cameras for scanning or the latest TDI cameras. Using the high resolution of the cameras, complex optical components (where the lens is far from the surface of the object to be measured and is designed to gather reflected light) or structural designs close to the object to be detected to detect surface defects, and the scanning must be completed through the relative movement between the lens and the object to be detected. However, these devices are not yet mature in technology, specifically manifested as poor detection versatility, especially low accuracy and efficiency, and a complex overall structure. Utility Model Content

[0005] In order to improve the detection accuracy and detection efficiency and ensure the defect detection rate, this application provides a defect detection mechanism for the hole area of a liquid crystal panel.

[0006] A defect detection mechanism for the hole area of a liquid crystal panel provided by this application adopts the following technical solutions:

[0007] A defect detection mechanism for a liquid crystal panel hole area, including a frame and an image acquisition device installed on the frame. A point light source is arranged inside the image acquisition device, and the light emitting direction of the point light source is the same as the light emitting direction of the image acquisition device. A ring light source is arranged on the periphery of the image acquisition device, and the light emitting direction of the ring light source is the same as the light emitting direction of the image acquisition device.

[0008] By adopting the above technical solution, combining the point light source and the ring light source, this design can highlight various defects in the liquid crystal panel hole area, such as cracks, rainbow patterns, etc., thereby improving the accuracy and efficiency of detection. And the solution of this application has a simple structure and strong versatility, and can effectively reduce the detection cost.

[0009] Optionally, the frame includes an equipment installation bracket and a ring light source installation bracket. The image acquisition device is installed at the center of the equipment installation bracket, the ring light source installation bracket is arranged on the periphery of the equipment installation bracket, the ring light source is installed on the ring light source installation bracket, and the position of the ring light source installation bracket can be adjusted along the light emitting direction of the image acquisition device.

[0010] By adopting the above technical solution, this design enables the position of the ring light source to be adjusted according to actual detection requirements, adjusting the irradiation area size and irradiation brightness size of the ring light source on the liquid crystal panel, so as to meet the defect detection requirements of the liquid crystal panel.

[0011] Optionally, the detection mechanism further includes a Z-axis movement module, and the frame is installed at the output end of the Z-axis movement module for driving the frame to vertically approach or vertically move away from the liquid crystal panel.

[0012] By adopting the above technical solution, through the Z-axis movement module, the distance between the image acquisition device and the liquid crystal panel can be conveniently adjusted to enable the image acquisition device to focus better and improve the detection accuracy.

[0013] Optionally, a rangefinder is installed on the side of the frame, the light emitting direction of the rangefinder is the same as the light emitting direction of the image acquisition device, and the rangefinder is electrically connected to the Z-axis movement module.

[0014] By adopting the above technical solution, during the detection process, the distance between the image acquisition device and different liquid crystal panels of the same type is generally the same. However, due to processing and other reasons, there will be a certain tolerance between different liquid crystal panels of the same type. At this time, the rangefinder can effectively control the distance between the image acquisition device and the liquid crystal panel to ensure that the distance between the two is equal, guaranteeing the clarity of the image and the detection rate of defects such as cracks and rainbow patterns.

[0015] Optionally, a rangefinder mounting bracket is installed on the frame, the rangefinder is installed on the rangefinder mounting bracket, and the position of the rangefinder mounting bracket can be adjusted along the light-emitting direction of the image acquisition device.

[0016] By adopting the above technical solution, by adjusting the position of the rangefinder mounting bracket, the position of the rangefinder can be further optimized, and the measurement accuracy can be improved.

[0017] Optionally, the detection mechanism further includes an X-axis movement module and a Y-axis movement module. The X-axis movement module is installed at the output end of the Y-axis movement module, and the Z-axis movement module is installed at the output end of the X-axis movement module.

[0018] By adopting the above technical solution, through the X-axis movement module and the Y-axis movement module, the precise movement of the image acquisition device on the horizontal plane can be realized to meet the detection requirements for liquid crystal panels at different positions.

[0019] Optionally, a hinge seat is installed at the bottom of the frame, and a spare point light source is installed on the hinge seat. The spare point light source can rotate on the hinge seat to adjust the angle between the light-emitting direction of the spare point light source and the light-emitting direction of the image acquisition device.

[0020] By adopting the above technical solution, the spare point light source can further improve the detection accuracy of a certain area of the liquid crystal panel.

[0021] Optionally, an adjustment hole is provided on the frame, the adjustment hole extends along the normal direction of the image acquisition device, and the hinge seat is installed on the frame through the adjustment hole.

[0022] By adopting the above technical solution, the design of the adjustment hole enables the position and angle of the spare point light source to be flexibly adjusted to meet different lighting requirements.

[0023] Optionally, a plurality of spare point light sources are arranged at equal intervals around the circumferential direction of the image acquisition device.

[0024] By adopting the above technical solution, the arrangement of multiple spare point light sources can provide a more uniform lighting effect and further improve the detection accuracy.

[0025] Optionally, the frame is a sheet metal part.

[0026] By adopting the above technical solution, the sheet metal part has high strength and stability, which can ensure long-term use and extend the service life.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Due to the illumination method combining a point light source and a ring light source, cracks, rainbow patterns and other defects in the hole area of the liquid crystal panel can be highlighted, thus improving the accuracy and efficiency of detection.

[0029] 2. The frame is ingeniously designed, including an equipment installation bracket and a ring light source installation bracket, and the position of the ring light source installation bracket is adjustable, enabling the ring light source to be adjusted according to actual needs, further enhancing the flexibility of detection.

[0030] 3. By adding high-precision components such as a Z-axis movement module, a rangefinder, and X-axis and Y-axis movement modules, the three-dimensional precise movement and positioning function of the detection mechanism is realized, greatly improving the convenience and accuracy of detection.

[0031] 4. The design of the spare point light source and the adjustment hole takes into account the stability and adaptability of the equipment during use, providing a strong guarantee for long-term stable detection work. Description of the Drawings

[0032] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0033] Figure 2 is a bottom view of the overall structure of an embodiment of the present application.

[0034] Description of the Reference Numerals:

[0035] 10, frame; 101, adjustment hole; 11, equipment installation bracket; 12, ring light source installation bracket; 121, waist-shaped hole; 13, rangefinder installation bracket; 20, image acquisition device; 30, point light source; 40, ring light source; 50, X-axis movement module; 51, Y-axis movement module; 52, Z-axis movement module; 60, rangefinder; 70, hinge seat; 71, spare point light source. Detailed Description of the Embodiment

[0036] The following will Figure 1-2 further describe the present application in detail with reference to the attached

[0037] A liquid crystal panel hole area defect detection mechanism provided by an embodiment of the present application, as Figure 1 shown, includes a frame 10 and an image acquisition device 20 installed on the frame 10. Preferably, the frame 10 is a sheet metal part. The image acquisition device 20 is used to capture images of the hole area of the liquid crystal panel for subsequent defect detection. Optionally, the image acquisition device 20 is a vision detection camera.

[0038] A point light source 30 is arranged in the image acquisition device 20, and the light emitting direction of the point light source 30 is the same as that of the image acquisition device 20. The point light source 30 can provide concentrated light, making the details in the hole area of the liquid crystal panel clearer and facilitating the capture and identification of defects.

[0039] Referring to Figure 1 and Figure 2 , at the same time, a ring light source 40 is provided on the periphery of the image acquisition device 20, and the light emitting direction of the ring light source 40 is the same as that of the image acquisition device 20. The ring light source 40 can provide uniform illumination, making the overall image of the liquid crystal panel hole area brighter and further improving the visibility of defects. By combining the point light source 30 and the ring light source 40, this design can highlight defects such as cracks and rainbow patterns in the liquid crystal panel hole area, thereby improving the accuracy and efficiency of detection.

[0040] The liquid crystal panel hole area defect detection mechanism provided by the embodiment of the present application further includes an X-axis moving module 50, a Y-axis moving module 51 and a Z-axis moving module 52. The X-axis moving module 50 is installed at the output end of the Y-axis moving module 51, and the Z-axis moving module 52 is installed at the output end of the X-axis moving module 50, and the frame 10 is installed at the output end of the Z-axis moving module 52. Optionally, the maximum moving speed of the X-axis moving module 50 and the Y-axis moving module 51 can reach 1500 mm / s, and the moving speed can be changed according to the actual operation of the X-axis moving module 50 and the Y-axis moving module 51. Through such a design, the X-axis moving module 50, the Y-axis moving module 51 and the Z-axis moving module 52 are combined to form a three-axis moving system. The three-axis moving system is a prior art and will not be elaborated here. The three-axis moving system is used to drive the frame 10 to move, and then drive the image acquisition device 20 to move, so that the image acquisition device 20 can accurately focus on the liquid crystal panel, ensuring the accuracy of the liquid crystal panel defect detection.

[0041] In this embodiment, the frame 10 includes an equipment installation bracket 11 and a ring light source installation bracket 12. The image acquisition device 20 is installed at the center of the equipment installation bracket 11 to ensure the stability and shooting quality of the image acquisition device 20. The ring light source installation bracket 12 is arranged on the periphery of the equipment installation bracket 11, and the ring light source 40 is installed on the bottom side of the ring light source installation bracket 12. Moreover, the position of the ring light source installation bracket 12 can be adjusted along the light emitting direction of the image acquisition device 20, which enables the position of the ring light source 40 to be flexibly adjusted according to actual detection needs. Specifically, the ring light source installation bracket 12 is provided with a waist-shaped hole 121 extending along the light emitting direction, and the ring light source installation bracket 12 can be fixed to the equipment installation bracket 11 through fasteners in the waist-shaped hole 121.

[0042] At the same time, a rangefinder mounting bracket 13 is mounted on the side of the equipment mounting bracket 11, and a rangefinder 60 is mounted on the rangefinder mounting bracket 13, and the light emitting direction of the rangefinder 60 is the same as the light emitting direction of the image acquisition device 20. The rangefinder 60 is electrically connected to the Z-axis moving module 52, and can measure the distance between the image acquisition device 20 and the liquid crystal panel in real time to ensure that the distance between the two is equal, thereby ensuring the clarity of the image and the detection rate of defects such as cracks and rainbow lines.

[0043] The position of the rangefinder mounting bracket 13 can also be adjusted along the light emitting direction of the image acquisition device 20. Specifically, the rangefinder mounting bracket 13 is also provided with a waist-shaped hole 121 extending along the light emitting direction, and the rangefinder mounting bracket 13 can be fixed to the device mounting bracket 11 through a fastener in the waist-shaped hole 121.

[0044] In addition, the frame 10 is provided with an adjustment hole 101, which extends along the normal direction of the image acquisition device 20. A hinge seat 70 can be fixed in the adjustment hole 101 by a fastener, and a spare point light source 71 is installed on the hinge seat 70. The spare point light source 71 can rotate on the hinge seat 70 to adjust the angle between the light emitting direction of the spare point light source 71 and the light emitting direction of the image acquisition device 20. The spare point light source 71 can reflect more light to the image acquisition device 20, thereby increasing the image brightness.

[0045] Furthermore, a plurality of spare point light sources 71 may be arranged at equal intervals around the circumference of the image acquisition device 20 to provide a more uniform lighting effect, thereby further improving the accuracy of detection. In this embodiment, four spare point light sources 71 are arranged.

[0046] The implementation principle of this embodiment is as follows: the image acquisition device 20 moves with the three-axis moving system to the top of the liquid crystal panel, and the liquid crystal panel enters the field of view of the image acquisition device 20. The ring light source 40 and the point light source 30 are controlled to be in a stroboscopic state through the logic control of the light source controller, that is, after the light source controller receives the trigger signal from the PLC, it lights the light source, wherein the ring light source 40 is in a dark field and the point light source 30 is in a bright field. In the logic control of the light source controller, channel 1 controls the lighting of the ring light source 40. After the ring light source 40 is lit, the point light source 30 of channel 2 is also lit. A delay is set in the light source controller, and then the image acquisition device 20 receives the trigger signal to complete the image acquisition.

[0047] The image detection part mainly refers to collecting a large number of defect images according to the morphology of defects such as cracks and rainbow patterns in the hole area, and using deep learning to train the defects to ensure the detection of defects. The algorithm training is based on the different image morphologies reflected by the defects. By collecting a large number of defect samples, the sample library is enriched. The more types of defect samples there are, the higher the defect detection rate.

[0048] In summary, through ingenious design and high-precision component combination, the present application realizes efficient and accurate detection of the hole area of the liquid crystal panel, providing strong support for the quality control of liquid crystal panels of devices such as mobile phones.

[0049] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A liquid crystal panel hole area defect detection mechanism, characterized in that, It includes a frame (10) and an image acquisition device (20) mounted on the frame (10). A point light source (30) is arranged inside the image acquisition device (20). The light-emitting direction of the point light source (30) is the same as that of the image acquisition device (20). A ring light source (40) is arranged on the periphery of the image acquisition device (20). The light-emitting direction of the ring light source (40) is the same as that of the image acquisition device (20).

2. The liquid crystal panel hole area defect detection mechanism according to claim 1, characterized in that: The frame (10) includes an equipment installation bracket (11) and a ring light source installation bracket (12). The image acquisition device (20) is installed at the center of the equipment installation bracket (11). The ring light source installation bracket (12) is arranged on the periphery of the equipment installation bracket (11). The ring light source (40) is installed on the ring light source installation bracket (12). The position of the ring light source installation bracket (12) can be adjusted along the light-emitting direction of the image acquisition device (20).

3. A liquid crystal panel hole area defect detection mechanism according to claim 1, characterized in that: The detection mechanism further includes a Z-axis movement module (52). The frame (10) is installed at the output end of the Z-axis movement module (52) to drive the frame (10) to vertically approach or vertically move away from the liquid crystal panel.

4. The defect detection mechanism for the hole area of a liquid crystal panel according to claim 3, characterized in that: A rangefinder (60) is installed on the side of the frame (10). The light-emitting direction of the rangefinder (60) is the same as that of the image acquisition device (20). The rangefinder (60) is electrically connected to the Z-axis movement module (52).

5. The defect detection mechanism for the hole area of a liquid crystal panel according to claim 4, characterized in that: A rangefinder installation bracket (13) is installed on the frame (10). The rangefinder (60) is installed on the rangefinder installation bracket (13). The position of the rangefinder installation bracket (13) can be adjusted along the light-emitting direction of the image acquisition device (20).

6. The defect detection mechanism for the hole area of a liquid crystal panel according to claim 3, characterized in that: The detection mechanism further includes an X-axis movement module (50) and a Y-axis movement module (51). The X-axis movement module (50) is installed at the output end of the Y-axis movement module (51). The Z-axis movement module (52) is installed at the output end of the X-axis movement module (50).

7. A liquid crystal panel hole area defect detection mechanism according to any one of claims 1-6, characterized in that: A hinge seat (70) is installed at the bottom of the frame (10). A spare point light source (71) is installed on the hinge seat (70). The spare point light source (71) can rotate on the hinge seat (70) to adjust the angle between the light-emitting direction of the spare point light source (71) and the light-emitting direction of the image acquisition device (20).

8. A liquid crystal panel hole area defect detection mechanism according to claim 7, characterized in that: An adjustment hole (101) is formed on the frame (10). The adjustment hole (101) extends along the normal direction of the image acquisition device (20). The hinge seat (70) is installed on the frame (10) through the adjustment hole (101).

9. The liquid crystal panel hole area defect detection mechanism according to claim 7, characterized in that: A plurality of the spare point light sources (71) are arranged at equal intervals around the circumference of the image acquisition device (20).

10. A liquid crystal panel hole area defect detection mechanism according to claim 1, characterized in that: The frame (10) is a sheet metal part.

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