A detection tool for liquid crystal display production

Abstract

The utility model relates to liquid crystal display screen detection technical field discloses a kind of detection tool for liquid crystal display screen production, including support frame body, the top of the support frame body is provided with fixed frame, the top of the fixed frame is installed with flying point scanner, the front and rear sides of the top of the support frame body are fixed with fixed block, one of the fixed block is installed with servo motor, the top of the support frame body and between the position of two fixed blocks is also provided with two limit plates driven by servo motor;The top of one of the limit plates is installed with three groups of marking components, when flying point scanner detects that display screen exists flatness defect, the height of marker pen is used to make mark on the frame of display screen with defect, to facilitate subsequent staff to distinguish, effectively avoid that display screen with defect is mixed into display screen without detecting problem.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display screen testing technology, specifically a testing fixture for liquid crystal display screen production. Background Technology

[0002] A liquid crystal display (LCD) is a device that uses liquid crystal control technology to display colors. Its core component is liquid crystal, a special substance that possesses both the fluidity of a liquid and the optical anisotropy of a crystal. After production, LCD displays often require testing to ensure their quality.

[0003] A search revealed a patent publication with publication number CN222048939U, which discloses a display screen flatness detection device. Specifically, it includes: "a conveyor belt; connecting arms symmetrically fixedly installed on both sides of the conveyor belt, the bottom end of each connecting arm being fixedly connected to the upper surface of a mounting plate; a motor fixedly installed at the center of the upper surface of the mounting plate; and a rotating rod fixedly installed at the output end of the motor through the side wall of the mounting plate. This invention uses a sliding rod to drive limiting components to move in opposite directions. As the limiting components move synchronously in opposite directions, they can push the display screen positioned below the flying point scanning device. The limiting components at the four corners can cooperate to confine the display screen between them. The space between the four limiting components is directly below the flying point scanning device, which increases the accuracy of the device's display screen detection, facilitates display screen detection, and further increases the detection speed."

[0004] Through a search of the above technical solutions, we found that they still have certain defects by simulating their use. Since the flatness of the display screen is difficult to detect with the naked eye, it needs to be detected by a flying point scanner. However, problematic display screens often cannot be marked in time. Since the conveyor belt is continuously transporting the display screens, if the detected problematic display screens are not distinguished in time, they are easily mixed with undetected display screens and flow into the subsequent process, which will increase the rework cost and quality risk of the display screens. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a testing fixture for LCD screen production, comprising a support frame, a fixed frame at the top of the support frame, a flying spot scanner mounted on the top of the fixed frame, fixed blocks fixed on both the front and rear sides of the top of the support frame, a servo motor mounted on one of the fixed blocks, and two limiting plates driven by the servo motor at the top of the support frame and between the two fixed blocks; three marking components are mounted on the top of one of the limiting plates, the marking components including a fixed seat fixed on the limiting plate, an electric telescopic rod installed inside the fixed seat, a movable seat fixed to the power output shaft of the electric telescopic rod, a support plate fixed to the top front of the movable seat, and a marking pen inserted into the support plate; a PLC controller is also mounted on the top of the fixed frame.

[0007] As a further embodiment of this utility model: the PLC controller is connected to the flying point scanner via wires, and the PLC controller is also connected to the three electric telescopic rods via wires respectively.

[0008] As a further embodiment of this utility model: the top of the support plate is provided with a through hole for easy insertion of a marker pen, and a fastening screw is threadedly connected to the front of the support plate. One end of the fastening screw passes through the through hole, and a film is fixed to the end of the fastening screw that passes through the through hole. The film is in close contact with the marker pen.

[0009] As a further embodiment of this utility model: all three marker pens are erasable whiteboard markers, one of which is a red whiteboard marker, another is a yellow whiteboard marker, and the remaining marker is a green whiteboard marker.

[0010] As a further embodiment of this utility model: both the front and rear sides of the top of the support frame are fixed with fixing plates, and each fixing plate has two mutually spaced limiting rods penetrating its side. One end of each limiting rod movably penetrates the fixing plate and is fixed to the limiting plate.

[0011] As a further embodiment of this utility model: the power output shaft of the servo motor movably passes through the fixed block connected thereto and is connected to a bidirectional lead screw, the end of the bidirectional lead screw away from the servo motor being rotatably connected to another fixed plate.

[0012] As a further embodiment of this utility model: a movable block is fixed at the top center of each limiting plate, and the two movable blocks are respectively threaded onto the two opposite threads of the bidirectional lead screw. The left and right sides of the two limiting plates are designed as inclined structures.

[0013] As a further embodiment of this utility model, it also includes a liquid crystal display screen that is conveyed by a conveyor belt, wherein the edge position of the liquid crystal display screen corresponds to the position of the marker pen.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In this application, the designed limiting plate can be used to conveniently limit the transport of the display screen to be inspected, ensuring its stability during the inspection process. Through the cooperation between the flying point scanner, PLC controller, and electric telescopic rod, when the flying point scanner detects a flatness defect in the display screen, the height of the marking pen is lowered to mark the defective display screen frame, which facilitates subsequent differentiation by the staff and effectively prevents defective display screens from being mixed with display screens that have not been detected. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the liquid crystal display screen of this utility model when it is marked by a marker pen;

[0018] Figure 3 This is a three-dimensional structural diagram of the marking component of this utility model;

[0019] Figure 4 This is a schematic diagram of the workflow of this utility model.

[0020] The reference numerals and names in the figure are as follows:

[0021] 1. Support frame; 2. Conveyor belt; 3. Fixing plate; 4. Fixing bracket; 5. Flying spot scanner; 6. PLC controller; 7. Fixing block; 8. Servo motor; 801. Bidirectional lead screw; 9. Limiting plate; 901. Movable block; 10. Marking assembly; 1001. Fixing seat; 1002. Electric telescopic rod; 1003. Movable seat; 1004. Support plate; 1005. Marking pen; 11. Limiting rod; 12. Fastening screw; 13. LCD display screen. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4A testing fixture for LCD screen production includes a support frame 1. A fixed frame 4 is mounted on the top of the support frame 1. A flying-spot scanner 5 is mounted on the top of the fixed frame 4, positioned centrally at the top of the fixed frame 4, with its detection end positioned centrally at the bottom of the fixed frame 4. The working principle of the flying-spot scanner 5 is a well-known technology; its specific model and specifications can be selected based on the device and actual conditions, and therefore will not be described in detail. Fixed blocks 7 are fixed on both the front and rear sides of the top of the support frame 1, with a servo motor 8 mounted on one of the fixed blocks 7. At the top and between the two fixed blocks 7, there are two limiting plates 9 driven by a servo motor 8; one of the limiting plates 9 has three sets of marking components 10 installed on its top. The marking components 10 include a fixed seat 1001 fixed on the limiting plate 9, an electric telescopic rod 1002 installed inside the fixed seat 1001, a movable seat 1003 fixed to the power output shaft of the electric telescopic rod 1002, a support plate 1004 fixed to the top front of the movable seat 1003, and a marking pen 1005 inserted into the support plate 1004; a PLC controller 6 is also installed on the top of the fixing frame 4.

[0024] Please see Figure 1 , Figure 2 and Figure 3 In this embodiment, the PLC controller 6 is connected to the flying point scanner 5 via wires. The PLC controller 6 is also connected to the three electric telescopic rods 1002 via wires. The three marker pens 1005 are erasable whiteboard markers, one of which is a red whiteboard marker, another is a yellow whiteboard marker, and the last one is a green whiteboard marker.

[0025] Specifically, the three marker pens 1005 represent different levels of defect. The red marker pen 1005 represents a severe defect, the yellow marker pen 1005 represents a medium defect, and the green marker pen 1005 represents a minor defect. After the LCD screen 13 is scanned by the flying dot scanner 5, the information is transmitted to the PLC controller 6. The PLC controller 6 determines the degree of defect and activates the corresponding electric telescopic rod 1002, thereby making different colored marks according to the degree of defect on the display screen. This is more conducive to the subsequent judgment and differentiation by the staff. All three marker pens 1005 are erasable whiteboard markers, which can be easily erased after the defect is removed.

[0026] Please see Figure 3In this embodiment, the top of the support plate 1004 is provided with a through hole for easy insertion of the marker pen 1005. The front of the support plate 1004 is threaded with a fastening screw 12. One end of the fastening screw 12 passes through the through hole, and a film is fixed on the end of the fastening screw 12 that passes through the through hole. The film is in close contact with the marker pen 1005.

[0027] Specifically, the marker pen 1005 is inserted into the support plate 1004 and fixed by tightening the fastening screw 12, which makes it easy to replace the marker pen 1005 or adjust its height.

[0028] Please see Figure 1 and Figure 2 In this embodiment, fixing plates 3 are fixed on both the front and rear sides of the top of the support frame 1. Two mutually spaced limiting rods 11 are passed through the side of each fixing plate 3. One end of the limiting rod 11 passes through the fixing plate 3 and is fixed on the limiting plate 9.

[0029] Specifically, by fixing a limiting rod 11 to the limiting plate 9, the limiting rod 11 can move through the fixing plate 3, thereby improving the stability of the limiting plate 9 during movement and enhancing its limiting effect.

[0030] Please see Figure 1 and Figure 2 In this embodiment, the power output shaft of the servo motor 8 passes through the fixed block 7 connected thereto and is connected to a bidirectional lead screw 801. The end of the bidirectional lead screw 801 away from the servo motor 8 is rotatably connected to another fixed plate 3. A movable block 901 is fixed at the top center of each limiting plate 9. The two movable blocks 901 are respectively threaded onto the two opposite threads of the bidirectional lead screw 801. The left and right sides of the two limiting plates 9 are designed as inclined structures.

[0031] Specifically, after the servo motor 8 starts, it drives the bidirectional lead screw 801 to rotate forward or backward, thereby causing the two movable blocks 901 to move closer or further apart, which in turn causes the two limiting plates 9 to move closer or further apart, thus adjusting the distance between the two limiting plates 9 to facilitate the limiting of LCD screens 13 of different widths. The inner side of the limiting plate 9 has an inclined structure to facilitate the sliding of the LCD screen 13.

[0032] Please see Figure 1 and Figure 2 In this embodiment, a liquid crystal display screen 13 is also included, which is conveyed by a conveyor belt 2. The edge position of the liquid crystal display screen 13 corresponds to the position of the marker pen 1005.

[0033] Specifically, the LCD screen 13 is conveyed by the conveyor belt 2, and the edge of the LCD screen 13 corresponds to the position of the marker pen 1005, which makes it easy for the marker pen 1005 to contact the edge after descending the height, thereby leaving a mark.

[0034] In use, the LCD screen 13 to be inspected is placed on the conveyor belt 2. The conveyor belt 2 transports the LCD screen 13 from right to left. When the LCD screen 13 reaches below the mounting bracket 4, it is scanned and inspected by the flying spot scanner 5, and the results are fed back to the PLC controller 6. If the LCD screen 13 is free of defects, the conveyor belt 2 continues to transport the LCD screen 13. If the LCD screen 13 is defective, the PLC controller 6 makes an unevenness judgment and, based on the unevenness level (defect level), activates a corresponding electric telescopic rod 1002. The power output shaft of the electric telescopic rod 1002 retracts, thereby driving the movable seat 1003 to descend, which in turn drives the marking pen 1005 to descend. Since the LCD screen 13 is continuously transported by the conveyor belt 2, when a defective LCD screen 13 approaches the corresponding marking pen 1005, the marking pen 1005 will draw a mark on the edge of the LCD screen 13 (e.g., ...). Figure 2 As shown), defective LCD screens 13 can be easily marked, making it easier for subsequent staff to distinguish them. After marking, the PLC controller 6 controls the power output shaft of the electric telescopic rod 1002 to extend, driving the marking pen 1005 to rise again.

[0035] In the above manner, multiple LCD screens 13 that need to be inspected can be placed on the conveyor belt 2 at intervals, and transported sequentially to the bottom of the fixed frame 4 for defect inspection by the conveyor belt 2. When there is a defect, it is marked with a marker pen 1005. When there is no defect, the PLC controller 6 does not give instructions to the electric telescopic rod 1002, that is, it does not mark on the LCD screen 13.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A testing fixture for liquid crystal display production, comprising a support frame (1), a fixing frame (4) being provided on the top of the support frame (1), and a flying spot scanner (5) being mounted on the top of the fixing frame (4), characterized in that, The front and rear sides of the top of the support frame (1) are fixed with fixing blocks (7), one of the fixing blocks (7) is equipped with a servo motor (8), and two limiting plates (9) driven by the servo motor (8) are also provided at the top of the support frame (1) and between the two fixing blocks (7). One of the limiting plates (9) has three sets of marking components (10) installed on its top. The marking components (10) include a fixed seat (1001) fixed on the limiting plate (9), an electric telescopic rod (1002) installed inside the fixed seat (1001), a movable seat (1003) fixed to the power output shaft of the electric telescopic rod (1002), a support plate (1004) fixed on the top front of the movable seat (1003), and a marking pen (1005) inserted into the support plate (1004). A PLC controller (6) is also installed on the top of the mounting bracket (4).

2. The testing fixture for liquid crystal display production according to claim 1, characterized in that, The PLC controller (6) is connected to the flying point scanner (5) via wires, and the PLC controller (6) is also connected to the three electric telescopic rods (1002) via wires respectively.

3. The testing fixture for liquid crystal display production according to claim 1, characterized in that, The top of the support plate (1004) has a through hole for easy insertion of a marker pen (1005). The front of the support plate (1004) is threaded with a fastening screw (12). One end of the fastening screw (12) passes through the through hole. A film is fixed to the end of the fastening screw (12) that passes through the through hole. The film is in close contact with the marker pen (1005).

4. The testing fixture for liquid crystal display production according to claim 1, characterized in that, All three markers (1005) are erasable whiteboard markers, one of which is a red whiteboard marker, another is a yellow whiteboard marker, and the last one is a green whiteboard marker.

5. The testing fixture for liquid crystal display production according to claim 1, characterized in that, The front and rear sides of the top of the support frame (1) are fixed with fixing plates (3). Each fixing plate (3) has two mutually spaced limiting rods (11) running through its side. One end of the limiting rod (11) runs through the fixing plate (3) and is fixed to the limiting plate (9).

6. The testing fixture for liquid crystal display production according to claim 1, characterized in that, The power output shaft of the servo motor (8) moves through the fixed block (7) connected to it and is connected to a bidirectional lead screw (801). The end of the bidirectional lead screw (801) away from the servo motor (8) is rotatably connected to another fixed plate (3).

7. The testing fixture for liquid crystal display production according to claim 6, characterized in that, Each of the limiting plates (9) has a movable block (901) fixed at the top center. The two movable blocks (901) are respectively threaded onto the two opposite threads of the bidirectional lead screw (801). The left and right sides of the two limiting plates (9) are designed as inclined structures.

8. The testing fixture for liquid crystal display production according to claim 1, characterized in that, It also includes a liquid crystal display screen (13) that is conveyed by a conveyor belt (2), the border of which corresponds to the position of the marker pen (1005).

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