Method for online detection of stripes of liquid crystal glass substrate

Abstract

The invention relates to the technical field of glass substrate processing, in particular to a liquid crystal glass substrate stripe online detection method which comprises the following steps: clamping and conveying a liquid crystal glass substrate to be detected to a curtain position, and rotating the liquid crystal glass substrate to enable an angle between the liquid crystal glass substrate and the curtain to be equal to a preset value; the light source system outputs illumination light rays consistent with the preset brightness, so that the stripe condition of the liquid crystal glass substrate is projected to the curtain; the image acquisition device acquires stripe conditions on the curtain and uploads the stripe conditions to the image processing system for analysis and processing; compared with the prior art, through the method, full inspection of the liquid crystal glass substrate can be achieved, product loss caused by manual sampling inspection is avoided, meanwhile, the risk of missing inspection is reduced, compared with manual inspection, the picture processing system can accurately analyze information such as the specific position, the shape and the number of strip pictures of the abnormal product, and the accuracy of detection is improved. And synchronously uploading and feeding back to the corresponding process, so that the corresponding process is subjected to process adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of glass substrate processing, and particularly to a method for on-line detection of stripes on a liquid crystal glass substrate. Background Art

[0002] The liquid crystal glass substrate is an important raw material for TFT-LCD and an important component affecting the quality of the display screen. Stripes are one of the common defects in the production of liquid crystal glass substrates and are also abnormal inclusions existing in the glass body, called glassy inclusions (stripes). Since the stripe defects affect the optical properties inside the glass substrate and also have a great impact on the display effect of the optoelectronic display, affecting the overall brightness, clarity, color, etc. of the picture, it is necessary to prevent the products with stripe defects from flowing into users during the production of the glass substrate.

[0003] The traditional stripe detection method is relatively single. Manually taking the board to the corresponding equipment for detection not only affects the yield of the production line but also is time-consuming and laborious. If defective products are detected, they can only be scrapped in batches, which may result in waste of good products. At the same time, manual judgment is subjective and cannot accurately describe the stripe angle and shape, which is not conducive to the countermeasure adjustment of the corresponding process and urgently needs to be improved. Summary of the Invention

[0004] To solve the technical problems existing in the above background art, the present invention proposes a method for on-line detection of stripes on a liquid crystal glass substrate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for on-line detection of stripes on a liquid crystal glass substrate, characterized by comprising:

[0007] Clamping and conveying the liquid crystal glass substrate to be detected to the position of the curtain, and rotating the liquid crystal glass substrate so that the angle between it and the curtain is equal to a preset value;

[0008] The light source system outputs illumination light with the same brightness as the preset brightness, so that the stripe situation of the liquid crystal glass substrate is projected onto the curtain;

[0009] The image acquisition device acquires the stripe situation on the curtain and uploads it to the image processing system for analysis and processing.

[0010] Preferably, when the stripe quality of the liquid crystal glass substrate after analysis and processing is qualified, the liquid crystal glass substrate is conveyed to the good product station for packing. When the stripe quality of the liquid crystal glass substrate after analysis and processing is unqualified, the liquid crystal glass substrate is conveyed to the waste product station for scrapping.

[0011] Preferably, before the liquid crystal glass substrate is moved to the curtain position and rotated, the plane of the liquid crystal glass substrate is parallel to the plane of the curtain, and before the liquid crystal glass substrate is rotated, the direction of the light emitted by the light source system is directly opposite to the geometric center of the plane of the liquid crystal glass substrate and perpendicular to the plane of the liquid crystal glass substrate.

[0012] Preferably, the rotation angle range of the liquid crystal glass substrate to be detected is 0° - 60°.

[0013] Preferably, in the direction of the emitted light, the light source system, the liquid crystal glass substrate, and the curtain are arranged in sequence.

[0014] Preferably, the illumination light source of the light source system is a xenon lamp.

[0015] Preferably, the device for clamping the liquid crystal glass substrate to be detected is a conveying device, and the conveying device can be adjusted accordingly according to the different sizes of the liquid crystal glass substrate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] Compared with the prior art, through this method, full inspection of the liquid crystal glass substrate can be achieved, avoiding product losses caused by manual sampling inspection, reducing the risk of missed inspection at the same time. Moreover, compared with manual inspection, the image processing system can accurately analyze information such as the specific position, shape, and number of stripes of abnormal product stripe images, and synchronously upload and feedback to the corresponding processes for process adjustment, avoiding data errors caused by manual visual judgment, ensuring stable control of the stripe quality of the liquid crystal glass production line. At the same time, it can automatically perform good product packing or waste product scrapping to complete automatic determination of stripe quality. And through the conveying device, glass substrates of different sizes can be clamped and conveyed to meet the size requirements of different liquid crystal glass substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a module schematic diagram of the method for online detection of stripes on a liquid crystal glass substrate proposed by the present invention;

[0019] Figure 2 It is a position structure schematic diagram of the method for online detection of stripes on a liquid crystal glass substrate proposed by the present invention;

[0020] Figure 3 It is a flowchart of the method for online detection of stripes on a liquid crystal glass substrate proposed by the present invention.

[0021] In the figure: 110 - control system, 120 - laser detector, 121 - conveying device, 122 - conveyor belt, 130 - rotating device, 140 - light source system, 141 - camera, 142 - curtain, 150 - image processing system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] As Figures 1 - 3 shown, this embodiment provides a method for on-line detection of stripes on a liquid crystal glass substrate, including:

[0024] Clamp and convey the liquid crystal glass substrate to be detected to the position of the curtain 142, and rotate the liquid crystal glass substrate so that the angle between it and the curtain 142 is equal to the preset value;

[0025] The light source system 140 outputs illumination light consistent with the preset brightness, so that the stripe condition of the liquid crystal glass substrate is projected onto the curtain 142;

[0026] The image acquisition device acquires the stripe condition on the curtain 142 and uploads it to the image processing system 150 for analysis and processing.

[0027] Overall, the control system 110 sends the position information of the liquid crystal glass substrate to be detected to the conveying device 121 and controls the conveying device 121 to move to the position of the liquid crystal glass substrate to be detected. The machine clamp on the conveying device 121 clamps the top of the glass substrate, and then controls the moving block on the conveying device 121 to move along the path of the conveyor belt 122. When the laser detector 120 on the conveyor belt 122 detects the conveying device 121, the control system 110 controls the conveying device 121 to stop moving. At this time, the liquid crystal glass substrate is located directly in front of the curtain 142. After moving the liquid crystal glass substrate to the position to be detected, the control system 110 controls the rotating device 130 to drive the liquid crystal glass substrate to rotate to the angle set by the image processing system 150. Then, the control system 110 controls the light source system 140 to emit illumination light consistent with the preset brightness, so that the stripe condition of the liquid crystal glass substrate can be projected onto the curtain 142. Subsequently, the image acquisition device collects the projection on the curtain 142 and uploads the collected image to the image processing system 150 for analysis and processing, and determines whether the quality of the liquid crystal glass substrate is qualified based on the result of the analysis and processing.

[0028] Specifically, the laser detector 120 is composed of a laser detection probe, a controller, and a fixing device. The laser detection probe is connected to the conveyor belt 122 through the fixing device. The controller is internally provided with a main control board, an information transmitter, a network adapter, and a power controller. The information transmitter is connected to the control system 110 through the network and is used to detect whether a conveying device passes through.

[0029] Specifically, the image acquisition device can select the camera 141 for shooting, and the image processing system 150 includes image processing software and feedback processing software. The image processing system 150 can accurately analyze information such as the specific position, shape, and number of stripes of the abnormal product stripe image, and synchronously upload and feedback it to the corresponding process, so that the corresponding process can adjust the process, which can avoid data errors caused by manual visual judgment and ensure the stable control of the stripe quality of the liquid crystal glass production line.

[0030] As Figure 1 shown, in this embodiment, the control system 110 includes a main control board, an information transmitter, a network adapter, a power controller, and a display, and is used to connect and control the laser detector 120, the conveying device 121, the rotating device 130, the light source system 140, the camera 141, and the image processing system 150.

[0031] As Figures 2 - 3 shown, in this embodiment, when the stripe quality of the liquid crystal glass substrate after analysis and processing is qualified, the liquid crystal glass substrate is conveyed to the good product station for packing. When the stripe quality of the liquid crystal glass substrate after analysis and processing is unqualified, the liquid crystal glass substrate is conveyed to the waste product station for scrapping.

[0032] Specifically, conveying the liquid crystal glass substrate to the good product station for packing or conveying it to the waste product station for scrapping is all carried out through the conveying device 121. The conveying device 121 is provided with a top machine clamp, a moving block, and a controller. The controller internally is provided with a main control board, a network adapter, and a power controller. The information transmitter is connected to the control system 110 through the network to control the top machine clamp to clamp the liquid crystal glass substrate. When the liquid crystal glass substrate analyzed and processed by the image processing system 150 is a qualified product, the control system 110 controls the conveying device 121 to convey the liquid crystal glass substrate to the good product station for packing. When the liquid crystal glass substrate analyzed and processed by the image processing system 150 is an unqualified product, the control system 110 controls the conveying device 121 to convey the liquid crystal glass substrate to the waste product station for scrapping.

[0033] As Figures 1 - 2 shown, in this embodiment, when the liquid crystal glass substrate moves to the position of the curtain 142 and before rotation, the plane of the liquid crystal glass substrate is parallel to the plane of the curtain 142, and before the liquid crystal glass substrate rotates, the direction of the light emitted by the light source system 140 is directly opposite to the geometric center of the plane of the liquid crystal glass substrate and perpendicular to the plane of the liquid crystal glass substrate.

[0034] Specifically, when the liquid crystal glass substrate is conveyed to the front of the curtain 142 along the path of the conveyor belt 122 by the conveying device 121 and has not been rotationally adjusted, the plane of the liquid crystal glass substrate is parallel to the plane of the curtain 142, and the direction of the light emitted by the light source system 140 is directly opposite to the geometric center of the plane of the liquid crystal glass substrate. During the subsequent rotation of the liquid crystal glass substrate, the propagation path of the light in the liquid crystal glass substrate can be relatively symmetric, enabling more accurate capture of stripe information, avoiding the influence of optical path changes, refraction, or reflection caused by the stripes, and improving the detection accuracy.

[0035] As Figures 1 - 2 shown, in this embodiment, the rotation angle range of the liquid crystal glass substrate to be detected is 0° - 60°.

[0036] Specifically, the rotating device 130 is provided with a rotating gear and a controller. The controller internally is provided with a main control board, a network adapter, and a power controller. The information transmitter is connected to the control system 110 through the network to make the rotation angle of the liquid crystal glass substrate consistent with the preset value.

[0037] The stripe situation of the liquid crystal glass substrate may vary due to reasons such as the drawing direction, uneven cooling, or uneven internal stress release during the forming process. By rotating the liquid crystal glass substrate and then detecting its stripe situation, the accuracy and reliability of defect detection of the liquid crystal glass substrate can be improved. Controlling the angle between 0° - 60° is more conducive to establishing a unified quality evaluation standard, avoiding unnecessary data redundancy, and compared with the symmetry of the glass, the stripe situations detected when the glass rotates 30° and 150° may be similar, but compared with rotating 30°, it takes less time.

[0038] As Figure 2 shown, in this embodiment, in the direction of the emitted light, the light source system 140, the liquid crystal glass substrate, and the curtain 142 are arranged in sequence.

[0039] Specifically, in the direction of the emitted light, the light source system 140, the liquid crystal glass substrate, and the curtain 142 are arranged in sequence, which can ensure that the stripe situation of the liquid crystal glass substrate is projected onto the curtain 142, facilitating subsequent image acquisition and analysis processing.

[0040] As Figure 2 shown, in this embodiment, the illumination light source of the light source system 140 is a xenon lamp.

[0041] Specifically, the light source system 140 includes a xenon lamp and a controller. The light source system 140 is provided with a xenon lamp and a controller. Inside the controller, there are a main control board, a network adapter, and a power controller. The information transmitter is connected to the control system 110 through the network and is used to control the illumination brightness of the xenon lamp. Due to the high luminous intensity of the xenon lamp, it can ensure that strong enough light shines on the liquid crystal glass substrate, making the stripes projected onto the screen 142 more clearly and achieving the effect of improving the detection accuracy.

[0042] As Figure 2 shown, in this embodiment, the device for clamping the liquid crystal glass substrate to be detected is the conveying device 121, and the conveying device 121 can be adjusted accordingly according to the different sizes of the liquid crystal glass substrate.

[0043] Specifically, the conveying device 121 clamps the liquid crystal glass substrate to be detected, and the conveying device 121 can be adjusted accordingly according to the different sizes of the liquid crystal glass substrate to be detected, which can meet the requirements of different liquid crystal glass substrate sizes.

[0044] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A method for online detection of liquid crystal glass substrate stripes, characterized in that: include: Clamping a liquid crystal glass substrate to be inspected and conveying it to the position of a screen (142), and rotating the liquid crystal glass substrate so that the angle between the substrate and the screen (142) is equal to a preset value; The light source system (140) outputs illumination light consistent with a preset brightness, so that the stripes of the liquid crystal glass substrate are projected onto the screen (142); The image acquisition device acquires the stripes on the screen (142) and uploads them to the image processing system (150) for analysis and processing.

2. The method for online detection of liquid crystal glass substrate stripes according to claim 1, characterized in that: When the stripe quality of the liquid crystal glass substrate after analysis and processing is qualified, the liquid crystal glass substrate is transported to the good product station for packaging. When the stripe quality of the liquid crystal glass substrate after analysis and processing is unqualified, the liquid crystal glass substrate is transported to the waste station for scrapping.

3. The method for online detection of liquid crystal glass substrate stripes according to claim 1, characterized in that: When the liquid crystal glass substrate moves to the position of the screen (142) and before it rotates, the plane of the liquid crystal glass substrate is parallel to the plane of the screen (142), and before the liquid crystal glass substrate rotates, the direction of the light emitted by the light source system (140) is directly opposite to the geometric center of the plane of the liquid crystal glass substrate and is perpendicular to the plane of the liquid crystal glass substrate.

4. The method for online detection of liquid crystal glass substrate stripes according to claim 1, characterized in that: The rotation angle range of the liquid crystal glass substrate to be detected is 0°-60°.

5. The method for online detection of liquid crystal glass substrate stripes according to claim 1, characterized in that: In the direction of the emitted light, the light source system (140), the liquid crystal glass substrate and the screen (142) are arranged in sequence.

6. The method for online detection of liquid crystal glass substrate stripes according to claim 6, characterized in that: The illumination light source of the light source system (140) is a xenon lamp.

7. The method for online detection of liquid crystal glass substrate stripes according to claim 1, characterized in that: The device for clamping the liquid crystal glass substrate to be inspected is a conveying device (121), and the conveying device (121) can be adjusted accordingly according to different sizes of the liquid crystal glass substrate.

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