A large size screen detection device

Abstract

The utility model relates to a kind of large-size screen detection device, comprising: docking mechanism, it includes: base, first drive component, movable frame, second drive component and locating block, the first drive component is set to base and output end is connected with movable frame to drive movable frame and move along first direction, the movable frame is opened with the locating space for accommodating screen to be measured, the movable frame is set with multiple second drive components in the circumferential side of locating space, the locating block is connected in the output end of second drive component and can abut on the circumferential side of screen to be measured;Detection mechanism is set to the side of movable frame along first direction, it includes: fixed frame, probe component and polarizing component.The utility model is set above, positioning accuracy is significantly improved, forms multidirectional positioning constraint, can adapt to the morphological characteristics of large-size screen, effectively prevent screen from deviating or shaking in detection process.

Description

Technical Field

[0001] This utility model relates to the field of detection device technology, and in particular to a large-size screen detection device. Background Technology

[0002] With the rapid development of display technology, large-size screens such as LCD displays are increasingly widely used in smart TVs, commercial displays, and outdoor screens. During the production of large-size screens, rigorous testing of their electrical and optical performance is required to ensure product quality.

[0003] Existing technologies for large-size screen testing devices suffer from the following shortcomings: First, insufficient positioning accuracy. Traditional devices often employ manual-assisted positioning or unidirectional mechanical positioning, which is ill-suited to the low rigidity and susceptibility to deformation of large-size screens. Screen misalignment during positioning can lead to poor contact at the testing points, affecting testing accuracy. Second, low testing efficiency. Electrical and optical performance testing often requires completion on different equipment, necessitating multiple screen transfers. This not only increases operational steps but also increases the risk of screen damage due to impacts during transfer. Third, low automation. Some devices rely on manual adjustment of the testing component positions, making it difficult to adapt to the testing needs of screens of different sizes. Furthermore, the inconsistency of manual operation leads to significant fluctuations in testing results. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems of insufficient positioning accuracy, low detection efficiency and low degree of automation of the detection devices for large screens in the prior art, thereby providing a detection device for large screens.

[0005] To solve the above-mentioned technical problems, this utility model provides a large-size screen detection device, comprising:

[0006] The docking mechanism includes: a base, a first driving component, a movable frame, a second driving component, and a positioning block. The first driving component is disposed on the base and its output end is connected to the movable frame to drive the movable frame to move in a first direction. The movable frame has a positioning space for accommodating the screen to be tested. Multiple second driving components are disposed on the periphery of the positioning space. The positioning block is connected to the output end of the second driving component and can abut against the periphery of the screen to be tested.

[0007] The testing mechanism is located on one side of the movable frame along a first direction and includes: a fixed frame, a probe assembly, and a polarizing assembly. The fixed frame is located on the movement path of the movable frame, the probe assembly is located on the periphery of the fixed frame and corresponds to the screen to be tested, and the polarizing assembly is located on the side of the probe assembly away from the screen to be tested.

[0008] In one embodiment of the present invention, the first driving component includes: a driving motor, a driving screw connected to the output end of the driving motor, and a screw sleeve adapted to the driving screw and fixedly connected to the movable frame.

[0009] In one embodiment of the present invention, the movable frame is provided with a heat dissipation assembly, which includes: a heat dissipation shell disposed on the side of the movable frame away from the screen to be tested, and a plurality of fans disposed on the heat dissipation shell.

[0010] In one embodiment of the present invention, the base is provided with a first sliding pair extending along a first direction, and the movable frame is movably connected to the base through the first sliding pair.

[0011] In one embodiment of the present invention, the second driving component includes: a driving cylinder and a clamping block connected to the end of the driving cylinder, the positioning block being configured as a roller and rotatably connected to the clamping block, and the movable frame having an avoidance groove adapted to the clamping block.

[0012] In one embodiment of the present invention, the probe assembly is detachably mounted on a fixing frame, and the probe assembly includes a pressure plate and a probe mounted on the pressure plate.

[0013] In one embodiment of the present invention, the polarizing assembly includes: a bracket, a second sliding pair disposed on the bracket along a second direction, a polarizing frame connected to the second sliding pair, and a polarizing element mounted on the polarizing frame.

[0014] In one embodiment of this utility model, the size of the polarizing element is not smaller than the screen to be tested.

[0015] In one embodiment of the present invention, the second sliding pair is configured as a damping sliding pair, the second direction is the height direction, the polarizing frame is connected to a pull rope, the top of the bracket is rotatably connected to a pulley, and the pull rope is wound around the pulley and connected to a counterweight.

[0016] In one embodiment of the present invention, bearing seats are respectively provided on both sides of the base along the first direction, and the two ends of the drive screw are rotatably connected to the base through the bearing seats.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0018] The large-size screen inspection device described in this utility model has the following advantages: 1. Significantly improved positioning accuracy. In the docking mechanism, multiple second driving components drive the positioning blocks to cooperate in contacting the screen from the periphery, forming a multi-directional positioning constraint. This adapts to the shape characteristics of large-size screens and effectively prevents the screen from shifting or shaking during inspection. The first driving component drives the movable frame to move precisely along the first direction, ensuring that the screen can stably reach the inspection position. This solves the problem of insufficient accuracy in traditional positioning methods and provides a reliable position benchmark for subsequent inspections. 2. Simultaneously improved inspection comprehensiveness and efficiency. The inspection mechanism integrates a probe component and a polarizing component, enabling simultaneous inspection of electrical and optical performance at the same workstation. The probe component contacts the screen inspection point to collect electrical performance parameters, while the polarizing component provides polarized light to complete optical performance evaluation. Multi-dimensional inspection can be completed without transferring the screen, reducing operation steps, shortening the inspection cycle, and avoiding screen damage that may be caused by multiple transfers. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of the detection device of this utility model;

[0021] Figure 2 This is a schematic diagram of the docking mechanism of this utility model;

[0022] Figure 3 This is a structural schematic diagram of the docking mechanism of this utility model from another angle;

[0023] Figure 4 This is a schematic diagram of the structure of the testing mechanism of this utility model;

[0024] Figure 5 This is a schematic diagram of the backlight assembly of this utility model;

[0025] Figure 6 This is a utility model Figure 3 Enlarged view of point A in the middle;

[0026] Figure 7 This is a utility model Figure 5 Enlarged view of point B in the middle;

[0027] Figure 8 This is a structural schematic diagram of the fan of this utility model.

[0028] Explanation of reference numerals in the accompanying drawings: 1. Base; 2. Movable frame; 3. Second drive assembly; 31. Drive cylinder; 32. Clamping block; 33. Positioning block; 34. Clearance groove; 4. Fixing frame; 5. Polarizing assembly; 51. Bracket; 52. Second sliding pair; 53. Polarizing frame; 54. Polarizing element; 55. Pull rope; 56. Counterweight; 57. Pulley; 6. First drive assembly; 61. Drive motor; 62. Lead screw sleeve; 63. Drive lead screw; 64. Bearing seat; 7. Heat sink; 8. Fan; 9. First sliding pair; 10. Pressure plate; 11. Probe. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0030] Example

[0031] In this embodiment, the first direction is the front-to-back direction, and the second direction is the height direction or an approximate height direction.

[0032] Reference Figures 1-8 As shown, the present invention provides a large-size screen detection device, comprising:

[0033] The docking mechanism includes: a base 1, a first driving component 6, a movable frame 2, a second driving component 3, and a positioning block 33. The first driving component 6 is disposed on the base 1 and its output end is connected to the movable frame 2 to drive the movable frame 2 to move in a first direction. The movable frame 2 has a positioning space for accommodating the screen to be tested. Multiple second driving components 3 are disposed around the positioning space of the movable frame 2. The positioning block 33 is connected to the output end of the second driving component 3 and can abut against the periphery of the screen to be tested.

[0034] The testing mechanism is located on one side of the movable frame 2 along the first direction. It includes a fixed frame 4, a probe assembly, and a polarizing assembly 5. The fixed frame 4 is located on the movement path of the movable frame 2. The probe assembly is located on the periphery of the fixed frame 4 and corresponds to the screen to be tested. The polarizing assembly 5 is located on the side of the probe assembly away from the screen to be tested.

[0035] The large-size screen testing device of this utility model has a base 1 that provides basic support for the entire docking mechanism. Made of rigid material, it ensures that the screen will not deform due to external forces or vibrations during testing, providing a stable installation reference for other components. A first drive component 6 is fixed to the base 1, and its output end is connected to a movable frame 2, driving the movable frame 2 to reciprocate along a preset first direction, thereby adjusting the position of the screen under test on the testing path. A positioning space is provided on the movable frame 2, the size of which is adapted to the screen under test, allowing the screen to be placed stably within it. Multiple second drive components 3 are evenly distributed and symmetrically arranged on the periphery of the positioning space on the movable frame 2, which can apply positioning forces from different directions to accommodate large-size screens. A positioning block 33 is connected to the output end of the second drive component 3. When the second drive component 3 is activated, the positioning block 33 moves closer to the screen under test and abuts against its periphery. Through the synergistic effect of multi-directional forces, the screen under test is fixed in a preset position, preventing displacement during testing.

[0036] The testing mechanism is positioned on one side of the movable frame 2 along the first direction to perform performance testing on the screen. The fixed frame 4 is fixed along the movement path of the movable frame 2, providing a stable mounting base for the probe assembly and polarizing assembly 5, preventing deformation from affecting testing accuracy. The probe assembly is installed around the perimeter of the fixed frame 4, its position corresponding one-to-one with the testing points of the screen under test, ensuring precise contact. When the movable frame 2 moves the screen to the testing position, the probe assembly contacts the screen's testing points, enabling the testing of electrical performance parameters. The polarizing assembly 5 is positioned on the side of the probe assembly furthest from the screen, generating specifically polarized light to cooperate with the probe assembly in performing optical performance testing, such as evaluating parameters like display uniformity and brightness. The fixed frame 4 is fixedly installed on the base 1 or mounted on the ground via an external frame.

[0037] First, the screen to be tested is placed in the positioning space of the movable frame 2. The second drive component 3 drives the positioning block 33 to abut against the periphery of the screen to complete the positioning. Then, the first drive component 6 drives the movable frame 2 to move along the first direction to the detection mechanism. The probe component contacts the screen, and the polarizing component 5 provides transmitted polarized light, that is, light in a single direction, which is convenient for personnel to observe with the naked eye. After the test is completed, the first drive component 6 drives the movable frame 2 to reset, and the second drive component 3 drives the positioning block 33 to release and remove the screen to complete one test.

[0038] The multi-directional positioning design improves the accuracy and stability of screen positioning and avoids human positioning errors; the probe assembly and polarizing assembly 5 work together to achieve simultaneous detection of electrical and optical performance, improving detection efficiency; the precise movement of the movable frame 2 ensures that the screen reaches the preset detection position every time, guaranteeing detection consistency; automated operation reduces manual intervention, lowers labor intensity and screen damage risk, and is suitable for batch detection scenarios of large-size screens.

[0039] Reference Figures 2-3 As shown, the first drive assembly 6 includes: a drive motor 61, a drive screw 63 connected to the output end of the drive motor 61, and a screw sleeve 62 adapted to the drive screw 63 and fixedly connected to the movable frame 2. The drive motor 61 serves as a power source and is fixed to the base 1 via a bracket 51. The connection part adopts a rigid design to prevent vibration displacement during motor operation. The output end of the drive motor 61 is connected to the drive screw 63 via a coupling made of elastic material, which can buffer the torque impact during motor start-up and stop, protecting the drive screw 63 and the motor shaft. The drive screw 63 adopts a high-precision thread structure, and its surface is precision ground to ensure thread accuracy and straightness, reducing errors during transmission. The screw sleeve 62 is adapted to the drive screw 63, with its internal thread tightly engaging with the external thread of the screw. Simultaneously, the screw sleeve 62 is fixedly connected to the movable frame 2 via bolts, and the connection part is reinforced to ensure that the screw sleeve 62 can stably drive the movable frame 2 to move synchronously.

[0040] After the drive motor 61 starts, its rotational motion is transmitted to the drive screw 63 through the coupling, causing the screw to rotate around its own axis. Due to the self-locking nature of the threaded engagement between the screw sleeve 62 and the screw, the rotational motion of the screw is converted into the linear motion of the screw sleeve 62, which in turn drives the movable frame 2 to move along the first direction. By controlling the forward and reverse rotation of the drive motor 61, the reciprocating motion of the movable frame 2 can be realized. By controlling the rotation angle and speed of the motor, the moving distance and speed of the movable frame 2 can be precisely controlled, ensuring that it accurately stops at the preset position.

[0041] Reference Figure 2 , Figure 8 As shown, the movable frame 2 is equipped with a heat dissipation assembly, which includes a heat dissipation shell 7 disposed on the side of the movable frame 2 away from the screen under test, and multiple fans 8 disposed on the heat dissipation shell 7. The heat dissipation shell 7 is disposed on the side of the movable frame 2 away from the screen under test, and its shape is adapted to the structure of the movable frame 2, covering most of the area of ​​the movable frame 2 to form a relatively enclosed heat dissipation space. The heat dissipation shell 7 is made of materials with excellent thermal conductivity, such as aluminum alloy, which can quickly absorb the heat transferred from the movable frame 2 and the screen under test. Its surface is designed with heat dissipation fins to increase the contact area with air and improve heat dissipation efficiency. Multiple fans 8 are evenly distributed on the heat dissipation shell 7, forming an effective airflow for cooling. The fans 8 are low-noise, high-pressure models, ensuring heat dissipation while minimizing interference with the testing environment. When the screen under test generates heat during the testing process, the heat is transferred to the heat sink 7 through the movable frame 2. After the heat sink 7 absorbs the heat, the fan 8 starts and generates airflow. The airflow flows through the heat sink 7 and is discharged, forming a continuous air circulation, which dissipates the heat to the external environment, thereby reducing the temperature of the movable frame 2 and the screen under test.

[0042] Reference Figure 2 , Figure 3 As shown, the base 1 is provided with a first sliding pair 9 extending along a first direction, and the movable frame 2 is movably connected to the base 1 through the first sliding pair 9. The first sliding pair 9 extends along the first direction and consists of a slide rail and a slider. The slide rail is a high-precision linear guide rail, which is fixed to the base 1 with bolts to reduce frictional resistance during movement. The slider is fixedly connected to the movable frame 2, and the slider and the slide rail form a rolling friction fit with a small coefficient of friction, making the movement of the movable frame 2 smoother. The fit clearance between the slider and the slide rail is precisely controlled to ensure that the slider can slide freely while restricting the displacement of the movable frame 2 in the direction perpendicular to the first direction, preventing wobbling. The working principle of the first sliding pair 9 is as follows: when the first drive component 6 drives the movable frame 2 to move, the movable frame 2 drives the slider to move along the slide rail. The slide rail constrains the movement trajectory of the slider through its own straightness, so that the movable frame 2 can only move in a straight line along the first direction, avoiding deviation of the movable frame 2 due to transmission error of the drive component or external force. The presence of the rolling element converts the sliding friction between the slider and the slide rail into rolling friction, greatly reducing the movement resistance and making the movement of the movable frame 2 more stable.

[0043] Reference Figure 6 As shown, the second driving assembly 3 includes a driving cylinder 31 and a clamping block 32 connected to the end of the driving cylinder 31. The positioning block 33 is configured as a roller and rotatably connected to the clamping block 32. The movable frame 2 has a clearance groove 34 adapted to the clamping block 32. The driving cylinder 31 is fixedly installed on the periphery of the movable frame 2, and its cylinder body is rigidly connected to the movable frame 2 through a bracket 51. The end of the piston rod is connected to the clamping block 32, which can drive the clamping block 32 to reciprocate in the direction of approaching or moving away from the screen to be tested. The shape of the clamping block 32 is adapted to the clearance groove 34 opened on the movable frame 2. When the clamping block 32 moves, it can move freely in the clearance groove 34 to avoid interference with the movable frame 2, making the structure more compact. The positioning block 33 adopts a roller structure and is rotatably connected to the clamping block 32 through a rotating shaft. The outer ring of the roller is made of a soft and wear-resistant material such as rubber, which can produce elastic deformation when in contact with the periphery of the screen to be tested, reducing contact stress. The working principle of the second driving component 3 is as follows: When it is necessary to position the screen to be tested, the piston rod of the driving cylinder 31 extends and pushes the clamping block 32 to move towards the screen along the clearance groove 34. The clamping block 32 drives the roller to approach synchronously until the roller contacts the periphery of the screen. Since the roller can rotate around the axis, when there is a slight displacement of the screen, the roller rotates with the screen, converting sliding friction into rolling friction and reducing wear on the screen surface. After positioning is completed, the piston rod of the driving cylinder 31 retracts, driving the clamping block 32 and the roller to reset and release the constraint on the screen.

[0044] The probe assembly is detachably mounted on the mounting frame 4. The probe assembly includes a pressure plate 10 and probes 11 mounted on the pressure plate 10. The probe assembly is detachably mounted on the mounting frame 4, such as by bolts or snap-fit ​​connections. The connection structure is simple and reliable, facilitating quick disassembly and installation. The pressure plate 10 is made of a rigid material, possessing good flatness and structural stability, providing a uniform mounting reference for the probes 11 and ensuring that all probes 11 are at the same height. The probes 11 are evenly distributed on the pressure plate 10, and their number and distribution position are determined according to the detection point layout of the screen under test. The probe body of the probe 11 is made of a material with excellent conductivity, such as copper alloy, and the ends are passivated to ensure good contact with the screen detection points while avoiding scratching the screen.

[0045] When the screen under test reaches the detection position, the probe 11 on the pressure plate 10 makes precise contact with the detection points on the screen surface. The detection signal is transmitted to the detection system through the probe 11, realizing the detection of the screen's electrical performance parameters, such as conductivity and signal transmission strength. When detecting different types of screens, the connection structure can be loosened, the current probe assembly can be removed from the mounting bracket 4, replaced with a probe assembly that matches the detection point layout of the new screen, and then re-fixed. The probe 11 is electrically connected to the detection system, which is existing technology and will not be described in detail.

[0046] Reference Figure 5 As shown, the polarizing assembly 5 includes: a bracket 51, a second sliding pair 52 disposed on the bracket 51 along a second direction, a polarizing frame 53 connected to the second sliding pair 52, and a polarizing element 54 mounted on the polarizing frame 53. The second sliding pair 52 is fixed to the bracket 51 along the second direction, and its structure is similar to that of the first sliding pair 9, including a slide rail and a slider. The slide rail is connected to the bracket 51 by bolts, and the slider can slide freely along the slide rail. The polarizing frame 53 is fixedly connected to the slider and moves along the second direction with the slider. The frame structure of the polarizing frame 53 is adapted to the size of the polarizing element 54, providing a stable installation position for the polarizing element 54 and preventing the polarizing element 54 from shaking during movement. The polarizing element 54 uses a high-precision polarizer, which can generate polarized light in a specific direction. Its installation angle can be finely adjusted according to the detection requirements to ensure accurate polarization direction. The working principle of the polarizing component 5 is as follows: according to the optical testing requirements of the screen under test, the polarizing frame 53 is pushed to drive the slider to move along the slide rail of the second sliding pair 52, and the position of the polarizing element 54 in the second direction is adjusted; when the polarizing element 54 reaches the preset position, the friction between the slider and the slide rail can keep the polarizing frame 53 stationary, and the polarizing element 54 generates polarized light at this position, which penetrates the probe component and acts on the screen under test, and completes the optical performance test in conjunction with the probe component; if adjustment is required, the position can be changed by simply applying external force to push the polarizing frame 53.

[0047] The size of the polarizer 54 is not smaller than that of the screen under test. As the core functional component of the polarizing assembly 5, the size design of the polarizer 54 must match the maximum size of the screen under test. Specifically, the length and width of the polarizer 54 are not less than the corresponding dimensions of the screen under test, or its area is not less than the display area of ​​the screen under test. The shape of the polarizer 54 is usually consistent with that of the screen under test. If the screen under test is rectangular, the polarizer 54 also adopts a rectangular design, and the length of each side is slightly larger than the corresponding side length of the screen under test. If the screen under test has a special shape, the polarizer 54 is adapted according to its outline to ensure that the edge part can still cover the edge area of ​​the screen. This size setting of the polarizer 54 ensures that after it is installed on the polarizing frame 53, no matter how the position of the polarizing frame 53 is adjusted along the second direction, as long as the polarizer 54 remains relatively parallel to the screen under test, it can completely cover the display area of ​​the screen, and there is no part that is not transmitted by polarized light.

[0048] Reference Figure 7 As shown, the second sliding pair 52 is configured as a damped sliding pair, with the second direction being the height direction. The polarizer 53 is connected to a pull rope 55, and a pulley 57 is rotatably connected to the top of the support 51. The pull rope 55 is wound around the pulley 57 and connected to a counterweight 56. The second sliding pair 52 is a damped sliding pair, with a damping layer between its slide rail and the slider. When the slider moves along the slide rail, the damping layer generates frictional resistance, allowing the slider to remain stationary at any position without displacement due to its own weight or slight external forces. The second direction is the height direction, and the polarizer 53 can move vertically to adjust the height of the polarizer 54. A pull rope 55 is connected to one side of the polarizer 53, and the other end of the pull rope 55 passes around the pulley 57 fixed to the top of the support 51 and is connected to the counterweight 56. The weight of the counterweight 56 ​​matches the total weight of the polarizer 53 and the polarizer 54, forming a force balance. The working principle of this structure is as follows: When the height of the polarizer 54 needs to be adjusted, the operator applies external force to push the polarizer frame 53. The polarizer frame 53 drives the slider to move along the slide rail of the damping sliding pair in the height direction. At the same time, the pull rope 55 pulls the counterweight 56 ​​up or down. Due to the damping effect, the polarizer frame 53 can stop and stabilize at the current position at any time during the movement. The weight of the counterweight 56 ​​is transmitted to the polarizer frame 53 through the pull rope 55 and the pulley 57, which counteracts the weight of the polarizer frame 53 and the polarizer 54, so that the operator only needs to overcome the damping force to push the polarizer frame 53, which greatly reduces the operating force.

[0049] The base 1 has bearing seats 64 on both sides along the first direction. The two ends of the drive screw 63 are rotatably connected to the base 1 through the bearing seats 64. The bearing seats 64 are made of rigid materials such as cast iron, and have high strength and good resistance to deformation. The two bearing seats 64 are fixed to the two sides of the base 1 along the first direction by bolts, and are symmetrically distributed. Their installation positions are precisely calibrated to ensure that their axis lines coincide and are parallel to the first direction. The two ends of the drive screw 63 pass through the two bearing seats 64 respectively and are connected to the bearing seats 64 through deep groove ball bearings. The inner ring of the bearing is interference-fitted with the screw, and the outer ring is transition-fitted with the bearing seat 64, which ensures that the screw can rotate flexibly, while limiting the radial runout and axial movement of the screw. The working principle of this structure is as follows: when the drive motor 61 drives the drive screw 63 to rotate, the two ends of the screw rotate within the bearing housing 64 through the bearings. The bearing housing 64 provides radial support for the screw, preventing the screw from bending or shifting during rotation and ensuring that the axis of the screw is always parallel to the first direction. At the same time, the bearing housing 64 restricts the axial displacement of the screw, ensuring that the screw can only rotate around its own axis, and avoiding the impact of axial movement on the linear motion accuracy of the screw sleeve 62.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A large-size screen detection device, characterized in that, include: The docking mechanism includes: a base, a first driving component, a movable frame, a second driving component, and a positioning block. The first driving component is disposed on the base and its output end is connected to the movable frame to drive the movable frame to move in a first direction. The movable frame has a positioning space for accommodating the screen to be tested. Multiple second driving components are disposed on the periphery of the positioning space. The positioning block is connected to the output end of the second driving component and can abut against the periphery of the screen to be tested. The testing mechanism is located on one side of the movable frame along a first direction and includes: a fixed frame, a probe assembly, and a polarizing assembly. The fixed frame is located on the movement path of the movable frame, the probe assembly is located on the periphery of the fixed frame and corresponds to the screen to be tested, and the polarizing assembly is located on the side of the probe assembly away from the screen to be tested.

2. The large-size screen detection device according to claim 1, characterized in that: The first drive assembly includes: a drive motor, a drive screw connected to the output end of the drive motor, and a screw sleeve adapted to the drive screw and fixedly connected to the movable frame.

3. The large-size screen detection device according to claim 1, characterized in that: The movable frame is equipped with a heat dissipation assembly, which includes a heat dissipation shell disposed on the side of the movable frame away from the screen to be tested, and a plurality of fans disposed on the heat dissipation shell.

4. The large-size screen detection device according to claim 1, characterized in that: The base is provided with a first sliding pair extending in a first direction, and the movable frame is movably connected to the base through the first sliding pair.

5. The large-size screen detection device according to claim 1, characterized in that: The second drive assembly includes: a drive cylinder and a clamping block connected to the end of the drive cylinder. The positioning block is configured as a roller and rotatably connected to the clamping block. The movable frame has a clearance groove adapted to the clamping block.

6. The large-size screen detection device according to claim 1, characterized in that: The probe assembly is detachably mounted on the mounting bracket, and the probe assembly includes a pressure plate and a probe mounted on the pressure plate.

7. The large-size screen detection device according to claim 1, characterized in that: The polarizing assembly includes: a bracket, a second sliding pair disposed on the bracket along a second direction, a polarizing frame connected to the second sliding pair, and a polarizing element mounted on the polarizing frame.

8. The large-size screen detection device according to claim 7, characterized in that: The size of the polarizing element is not smaller than the screen to be tested.

9. A large-size screen detection device according to claim 7, characterized in that: The second sliding pair is configured as a damping sliding pair, the second direction is the height direction, the polarizing frame is connected to a pull rope, the top of the bracket is rotatably connected to a pulley, and the pull rope is wound around the pulley and connected to a counterweight.

10. A large-size screen detection device according to claim 2, characterized in that: The base is provided with bearing seats on both sides along the first direction, and the two ends of the drive screw are rotatably connected to the base through the bearing seats.

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