Warping detection device for liquid crystal glass substrate

Abstract

A liquid crystal glass substrate warping detection device disclosed by the present invention comprises a platform, a grid plate, a camera shooting unit, an image processing unit and a display unit, the grid plate is arranged right above the platform, a plurality of grids which are distributed in a matrix and are the same in shape are carved on the horizontal bottom surface of the grid plate, the camera shooting unit comprises a camera, and the camera shooting unit is arranged on the platform. The camera can capture reflection images of all grids on the grid plate on the glass substrate, the image processing unit can receive reflection image information transmitted by the camera shooting unit and calculate the area of the reflection images, and meanwhile the length and the width of the glass substrate are used as horizontal coordinates and vertical coordinates respectively, and the area value of the reflection images is used as vertical coordinates. The image processing unit can generate a glass substrate warping deformation image, the display unit can receive and display the glass substrate warping deformation image transmitted by the image processing unit, and the glass substrate is flatly placed on the platform, so that deformation of the glass substrate caused by the detection device is avoided, and detection personnel can quickly judge the warping condition of the glass substrate through the glass substrate warping image.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a warping detection device for a liquid crystal glass substrate. Background Art

[0002] In the production process of liquid crystal glass substrates, warpage is an important indicator for evaluating glass substrates. The quality of warpage directly reflects whether the production process is stable and reliable, and also has a great impact on the customer's process technology.

[0003] In practical applications, the glass substrate is often placed on a trolley at an angle or suspended for warpage detection. However, deformation of the glass substrate caused by the pad at the bottom of the glass substrate during tilt measurement and deformation of the glass substrate caused by the clip at the top of the glass substrate during suspension measurement will seriously affect the judgment of the quality of the glass substrate, which may lead to misjudgment of the product and waste of the product. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides a warping detection device for a liquid crystal glass substrate (6).

[0005] The invention discloses a device for detecting the warping of a liquid crystal glass substrate, comprising: a platform, a grid plate, a camera unit, an image processing unit, and a display unit. The top surface of the platform is a horizontal surface for placing a glass substrate. The grid plate is arranged directly above the platform. A plurality of grids of the same shape distributed in a matrix are engraved on the horizontal bottom surface of the grid plate. The grid area on the grid plate should be able to completely cover the horizontal projection of the glass substrate placed on the platform. The camera unit comprises a camera, which is installed and fixed on the center of the bottom surface of the grid plate. The camera can capture the reflection image of each grid on the grid plate on the glass substrate. The image processing unit is connected to the camera unit for communication. The image processing unit can receive the reflection image information transmitted by the camera unit and calculate the area of ​​the reflection image. At the same time, the length and width of the glass substrate are respectively the first horizontal coordinate and the first vertical coordinate, and the area value of the reflection image is used as the vertical coordinate to generate a glass substrate warping deformation image. The display unit is connected to the image processing unit for communication. The display unit can receive the glass substrate warping image transmitted by the image processing unit and display it.

[0006] Preferably, the top surface of the platform has a groove for placing the glass substrate, the bottom surface of the groove is a horizontal plane, an inflection point of the top surface of the groove is the reference zero point of the warping deformation image of the glass substrate, the glass substrate should be placed close to the reference zero point, and the top of the glass substrate should be exposed in the groove.

[0007] Preferably, a second abscissa and a second ordinate are drawn on the bottom surface of the groove of the platform with the reference zero point as the coordinate starting point, the second abscissa is located directly below the long side of the glass substrate placed in the groove, the second ordinate is located directly below the wide side of the glass substrate placed in the groove, and the first quadrant area of ​​the second abscissa and the second ordinate is drawn with the same grid pattern as that on the grid plate directly above it.

[0008] Preferably, the image processing unit may generate a columnar image based on the area value of the reflected image, and the height value of the columnar image is the area value of the reflected image.

[0009] Preferably, the image processing unit may divide the area value of the reflection image into different value intervals, and set a mark on the columnar image in each value interval that is different from other value intervals.

[0010] Preferably, the shape of the grid on the horizontal bottom surface of the grid plate is a square.

[0011] Preferably, the platform is made of marble.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Since the glass substrate is placed flat on the platform, deformation of the glass substrate caused by the detection device and the detection method is avoided, thereby avoiding the influence on the warping detection result. The warping condition of the glass substrate corresponding to the grid on the grid plate can be intuitively judged according to the area of ​​the reflection image of the grid on the grid plate on the glass substrate. After the reflection image captured by the camera is processed by the image processing unit and the display unit, the detection personnel can directly observe the warping deformation image of the glass substrate generated with the length and width of the glass substrate as the vertical coordinate and the area value of the reflection image as the vertical coordinate, so as to quickly and directly judge the warping condition of the glass substrate.

[0014] The image processing unit can generate a columnar image from the area value of the reflected image. The height value of the columnar image is the area value of the reflected image, which allows the inspection personnel to conveniently and intuitively observe the area size and overall distribution of the reflected image of the grid at each coordinate of the glass substrate, thereby more quickly determining the warping condition of the glass substrate.

[0015] The image processing unit can divide the area value of the reflected image into different numerical intervals, and set marks on the columnar image in each numerical interval that are different from those in other numerical intervals, so that the inspection personnel can more intuitively observe the warping condition of the glass substrate, and quickly locate the coordinates of the glass substrate where the difference between the area value of the reflected image and the standard value is large, and focus on the analysis here. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the main viewing direction of the warping detection device for the liquid crystal glass substrate proposed by the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the warping detection device for the liquid crystal glass substrate proposed by the present invention when viewed from above.

[0018] Figure 3 A top view of the platform.

[0019] Figure 4 The image of the glass substrate warping deformation displayed by the display unit. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1 to 3 The warpage detection device for a liquid crystal glass substrate 6 comprises: a platform 1, a grid plate 2, a camera unit 3, an image processing unit 4, and a display unit 5. The top surface of the platform 1 is a horizontal surface for placing the glass substrate 6. The grid plate 2 is arranged directly above the platform 1. A plurality of grids of the same shape distributed in a matrix are engraved on the horizontal bottom surface of the grid plate 2. In practical applications, the grid plate 2 can adopt a plate body with a white background, and a grid with a black border is drawn on the bottom surface of the plate body. The grid area on the grid plate 2 should be able to completely cover the horizontal projection of the glass substrate 6 placed on the platform 1. The camera unit 3 comprises a camera 31, and the camera 31 is fixedly installed. At the center of the bottom surface of the grid plate 2, the camera 31 can capture the reflection image of each grid on the grid plate 2 on the glass substrate 6. The image processing unit 4 is connected to the camera unit 3 for communication. The image processing unit 4 can receive the reflection image information transmitted by the camera unit 3 and calculate the area of ​​the reflection image. At the same time, the length and width of the glass substrate 6 are respectively the first horizontal coordinate 71 and the first vertical coordinate 72, and the area value of the reflection image is used as the vertical coordinate to generate a warping deformation image of the glass substrate 6. The display unit 5 is connected to the image processing unit 4 for communication. The display unit 5 can receive the warping image of the glass substrate 6 transmitted by the image processing unit 4 and display it.

[0022] Since the glass substrate 6 is placed flat on the platform 1, deformation of the glass substrate caused by the detection device and the detection method is avoided, thereby avoiding the influence on the warping detection result. The warping condition of the corresponding part of the grid on the glass substrate 6 is intuitively judged according to the area of ​​the reflection image of the grid on the grid plate 2 on the glass substrate 6, that is, the larger the difference between the area of ​​the reflection image of the grid and its standard area on the horizontal plane, the greater the degree of warping of the glass substrate 6 at this place, and the smaller the difference between the area of ​​the reflection image of the grid and its area on the horizontal plane, the better the horizontality of the glass substrate 6 at this place. After being processed by the image processing unit 4 and the display unit 5, the detection personnel can directly observe the warping deformation image of the glass substrate 6 generated with the length and width of the glass substrate 6 as the vertical coordinate and the area of ​​the reflection image as the vertical coordinate, and quickly and directly judge the warping condition of the glass substrate 6.

[0023] Reference Figure 1 The top surface of the platform 1 has a groove 11 for placing the glass substrate 6. The bottom surface of the groove 11 is a horizontal plane. An inflection point 111 on the top surface of the groove 11 is the reference zero point of the warping deformation image of the glass substrate 6. The glass substrate 6 should be placed close to the reference zero point, and the top of the glass substrate 6 should be exposed in the groove 11. On the one hand, the groove 11 can place the glass substrate 6 more reliably on the platform 1 to prevent the inspection personnel from accidentally touching the glass substrate 6 and causing the glass substrate 6 to slide off the platform 1. On the other hand, the reference zero point on the groove 11 makes it easier for the image processing unit 4 to establish a coordinate system for the warping deformation image of the glass substrate 6.

[0024] Reference Figure 3 The bottom surface of the groove 11 of the platform 1 is drawn with a second horizontal coordinate 12 and a second vertical coordinate 13 with the reference zero point as the coordinate starting point. The second horizontal coordinate 12 is located directly below the long side of the glass substrate 6 placed in the groove 11, and the second vertical coordinate 13 is located directly below the wide side of the glass substrate 6 placed in the groove 11. The first quadrant area of ​​the second horizontal coordinate 12 and the second vertical coordinate 13 is drawn with a grid pattern 14 that is the same as the grid plate 2 directly above them. When the inspection personnel determine the position on the glass substrate 6 with larger warping according to the warping deformation image of the glass substrate 6, they can quickly locate this position with the help of the second horizontal coordinate 12, the second vertical coordinate 13 and the grid pattern 14, and can make a mark at this position to facilitate subsequent repair and other work.

[0025] Reference Figure 4 The image processing unit 4 can generate a columnar image 74 based on the area value of the reflected image. The height value of the columnar image 74 is the area value of the reflected image, so that the inspection personnel can conveniently and intuitively observe the area size and overall distribution of the reflected image of the grid at each coordinate of the glass substrate 6, thereby determining the warping condition of the glass substrate 6 more quickly.

[0026] The image processing unit 4 can divide the area value of the reflection image into different value intervals, and set a mark on the columnar image 74 in each value interval that is different from other value intervals. In this embodiment, refer to Figure 3 Different colors are used to mark the columnar images 74 of different value intervals. For example, green can be used to mark the columnar images 74 within the qualified value interval, and red can be used to mark the columnar images 74 of the value interval that differs greatly from the standard value. The colors from green to red are used to mark the columnar images 74 that differ increasingly from the standard value from light to dark, so that the inspection personnel can more intuitively observe the area size and distribution of the reflection image of the grid, thereby more quickly determining the warping condition of the glass substrate 6, and can focus on the analysis of the coordinates of the glass substrate 6 corresponding to the red columnar graph.

[0027] Reference Figure 2 The grid shape on the horizontal bottom surface of the grid plate 2 is a square, so that the image processing unit 4 can better process the reflected image captured by the camera 31.

[0028] In order to ensure the levelness of the top surface of the platform 1, the platform 1 is made of marble that is not easily deformed.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting the warpage of a liquid crystal glass substrate, characterized in that: The invention comprises: a platform (1), a grid plate (2), a camera unit (3), an image processing unit (4), and a display unit (5); the top surface of the platform (1) is a horizontal surface on which a glass substrate (6) is placed; the grid plate (2) is arranged directly above the platform (1); a plurality of grids of the same shape distributed in a matrix are engraved on the horizontal bottom surface of the grid plate (2); the grid area on the grid plate (2) should be able to completely cover the horizontal projection of the glass substrate (6) placed on the platform (1); the camera unit (3) comprises a camera (31); the camera (31) is mounted and fixed on the central part of the bottom surface of the grid plate (2); the camera (31) can capture the grid plate (6) 2) on the glass substrate (6), the image processing unit (4) is connected in communication with the camera unit (3), the image processing unit (4) can receive the reflection image information transmitted by the camera unit (3) and calculate the area of ​​the reflection image, and at the same time, the length and width of the glass substrate (6) are respectively used as the first horizontal coordinate (71) and the first vertical coordinate (72), and the area value of the reflection image is used as the vertical coordinate (73), to generate a warping deformation image of the glass substrate (6), and the display unit (5) is connected in communication with the image processing unit (4), and the display unit (5) can receive the warping image of the glass substrate (6) transmitted by the image processing unit (4) and display it.

2. The device for detecting warpage of a liquid crystal glass substrate according to claim 1, wherein: The top surface of the platform (1) has a groove (11) for placing the glass substrate (6); the bottom surface of the groove (11) is a horizontal surface; an inflection point (111) on the top surface of the groove (11) is a reference zero point of a warping deformation image of the glass substrate (6); the glass substrate (6) should be placed close to the reference zero point, and the top of the glass substrate (6) should be exposed from the groove (11).

3. The device for detecting warpage of a liquid crystal glass substrate according to claim 2, wherein: A second horizontal coordinate (12) and a second vertical coordinate (13) are drawn on the bottom surface of the groove (11) of the platform (1) with the reference zero point as the coordinate starting point, the second horizontal coordinate (12) is located directly below the long side of the glass substrate (6) placed in the groove (11), the second vertical coordinate (13) is located directly below the wide side of the glass substrate (6) placed in the groove (11), and the first quadrant area of ​​the second horizontal coordinate (12) and the second vertical coordinate (13) is drawn with a grid pattern (14) identical to that on the grid plate (2) directly above them.

4. The device for detecting warpage of a liquid crystal glass substrate according to claim 1, wherein: The image processing unit (4) can generate a columnar image (74) based on the area value of the reflected image, and the height value of the columnar image (74) is the area value of the reflected image.

5. The device for detecting warpage of a liquid crystal glass substrate according to claim 4, characterized in that: The image processing unit (4) can divide the area value of the reflection image into different value intervals, and set a mark on the columnar image (74) in each value interval that is different from other value intervals.

6. The device for detecting warpage of a liquid crystal glass substrate according to claim 1, wherein: The grid shape on the horizontal bottom surface of the grid plate (2) is a square.

7. The device for detecting warpage of a liquid crystal glass substrate according to claim 1, wherein: The platform (1) is made of marble.

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