Testing device of LED display screen

Abstract

The invention discloses a testing device for an LED display screen, and relates to the technical field of display screen testing, the testing device comprises a testing box, a temperature control tube and a testing block, an overall pressing block moves downwards to apply uniform and comprehensive pressure to the LED display screen, the overall pressure resistance of the LED display screen is tested, and the testing efficiency is improved. When the LED display screen is subjected to overall compression resistance test through the overall pressing block, the electric valve installed on the inner wall of a certain conical air channel is opened, air enters the rectangular sliding groove in an accelerated mode through the conical air channel at the moment, the local pressing block is pushed to move downwards, and the situation that the local position is subjected to extra pressure when the LED display screen is subjected to overall pressure is tested. By opening the electric valve on the inner wall of a certain conical air duct, cold air and hot air enter the rectangular sliding groove in an accelerated mode through the conical air duct, the local pressing block is pushed to move downwards, local impact force is applied to the edge or a specific area of the LED display screen, the local pressure resistance performance is tested, and the mechanical performance of the LED display screen under different pressure conditions can be tested at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen testing, and more specifically, to a testing device for an LED display screen. Background Art

[0002] An LED display screen is a flat panel display that uses light-emitting diodes as pixels to display images, videos, and other visual content. The testing device for an LED display screen is an important tool for ensuring the quality and performance of the LED display screen. The design purpose of such a testing device is to detect and evaluate the performance of the LED display screen under different conditions, ensure that it meets the expected technical specifications and quality standards, ensure product quality, apply a long-term workload or repetitive operations (such as power on and off) to the display screen, and verify its service life and stability.

[0003] With the wide application of LED display screens in various fields, from indoor conference rooms, shopping mall billboards to outdoor large sports stadium screens, traffic signs, etc., the performance requirements are becoming increasingly strict. In addition to the basic display effects (such as brightness, color reproduction), the structural strength and durability have become important indicators for evaluating the quality of LED display screens, ensuring that the product can operate stably in various complex environments for a long time. This is not only because users have higher and higher requirements for visual experience, but also because the environmental conditions faced by the display screen in actual applications are becoming more and more complex and changeable.

[0004] In the actual use process of the prior art, since the current testing of LED display screens mainly focuses on electrical performance and display effects, less attention is paid to mechanical strength. In most cases, only a simple physical impact test is used to evaluate the durability of the product, and various stress conditions in actual applications cannot be simulated, lacking a comprehensive impact resistance test, and it is difficult to comprehensively reflect the performance of the product in the real working environment. Therefore, in view of the above technical problems, it is necessary to provide a testing device for an LED display screen. Summary of the Invention

[0005] The purpose of the present invention is to provide a testing device for an LED display screen to solve the above problems.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows: A testing device for an LED display screen, comprising a testing box, a temperature control pipe and a testing block. Two electric push rods are symmetrically and fixedly connected to the top of the inner cavity of the testing box, and a moving air frame is fixedly connected to the lower ends of the electric push rods; The temperature control pipe includes a hose connected to the middle of the upper surface of the moving air frame. The upper end of the hose is respectively connected to a cold air pipe and a hot air pipe through a three-way pipe. A plurality of input pipes are symmetrically connected to both sides of the moving air frame. Two guide air plates are symmetrically and fixedly connected to the lower part of the inner cavity of the testing box. A heat-conducting bottom plate is fixedly connected to the bottom of the inner cavity of the testing box. Four L-shaped positioning plates are symmetrically and fixedly connected to the upper surface of the heat-conducting bottom plate; The testing block includes an integral pressing block fixedly connected to the middle of the lower surface of the moving air frame. A plurality of rectangular sliding grooves are symmetrically arranged on the lower surface of the integral pressing block. A partial pressing block is installed in the inner cavity of the rectangular sliding groove. A plurality of conical air ducts are evenly arranged in the inner cavity of the integral pressing block. The conical air ducts communicate the moving air frame with the rectangular sliding groove. Electric valves are installed on the inner walls of the conical air ducts. Two friction blocks are symmetrically installed in the inner cavity of the lower surface of the partial pressing block. Two electromagnets are symmetrically inlaid and fixed above the inner cavity of the partial pressing block. A magnetic block is inlaid and fixed in the inner cavity of the friction block.

[0007] As a further improvement of the present invention, a plurality of support legs are evenly and fixedly connected to the lower surface of the testing box. Anti-slip pads are fixedly connected to the lower ends of the support legs. An airtight box door is installed on the front surface of the testing box.

[0008] As a further improvement of the present invention, the moving air frame is a rectangular block with a hollow interior. The inner cavity of the testing box is fixedly connected to the outer surface of the three-way pipe at the upper end of the hose. The guide air plates are arranged obliquely downward.

[0009] As a further improvement of the present invention, the heat-conducting bottom plate is made of a heat-conducting material. The LED display screen to be tested is placed in the inner cavity of the L-shaped positioning plate.

[0010] As a further improvement of the present invention, rectangular grooves are symmetrically arranged on both sides of the inner cavity of the rectangular sliding groove. Rectangular blocks are symmetrically arranged on both sides of the partial pressing block. The partial pressing block is slidably connected to the rectangular sliding groove through the cooperation of the rectangular blocks and the rectangular grooves.

[0011] As a further improvement of the present invention, two limiting rods are symmetrically and fixedly connected to one side of the friction block. Four limiting grooves are symmetrically arranged on both sides of the partial pressing block. The limiting rods are slidably connected to the limiting grooves.

[0012] As a further improvement of the present invention, the friction block includes a moving block movably connected to the lower inner cavity of the partial pressing block. A low-friction coefficient film, a medium-friction coefficient film and a high-friction coefficient film are respectively inlaid and fixed in the inner cavity of the lower surface of the moving block.

[0013] As a further improvement of the present invention, a smooth control surface is provided between the low-friction coefficient diaphragm and the medium-friction coefficient diaphragm, and a smooth control surface is also provided between the medium-friction coefficient diaphragm and the high-friction coefficient diaphragm.

[0014] As a further improvement of the present invention, the two electromagnets are respectively located above the sides of the two magnetic blocks close to each other, and the electromagnets are magnetically connected to the magnetic blocks.

[0015] As a further improvement of the present invention, magnetic isolation plates are installed on the outer surfaces of the two electromagnets, and the magnetic isolation plates are L-shaped and fixedly connected to the upper surface and the inner side surface of the electromagnets respectively.

[0016] Compared with the prior art, the advantages of the present invention are as follows: (1) In this solution, cold and hot airflows are delivered into the test chamber through cold air ducts and hot air ducts, enter the interior of the movable air frame, and then enter the test chamber through multiple input pipes. Under the action of the inclined air guide plate, the vertically downward airflow is guided to blow onto the surface of the LED display screen and evenly distributed inside the chamber. The heat-conducting bottom plate comes into contact with the hot air and quickly conducts the heat to the bottom of the LED display screen, assisting in evenly conducting cold and heat to the LED display screen, simulating high-temperature and low-temperature environments in the natural environment. The enclosed environment can prevent external interference and protect the consistency of the test environment, enabling the measurement results of the LED display screen to be tested simultaneously in complex environments such as high temperature / low temperature. (2) In this solution, the overall block moves downward to exert uniform and comprehensive pressure on the LED display screen to test the overall impact resistance of the LED display screen. While the LED display screen is undergoing an overall compressive test through the overall block, an electric valve installed on the inner wall of a certain conical air duct is opened. At this time, cold and hot air accelerate into the rectangular chute through the conical air duct, pushing the local block downward to test the situation where the local position of the LED display screen is subjected to additional pressure when the whole is under pressure. And by opening an electric valve installed on the inner wall of a certain conical air duct when the LED display screen is placed flat normally, cold and hot air accelerate into the rectangular chute through the conical air duct, pushing the local block downward to apply local pressure to the edge or specific area of the LED display screen to test the local pressure resistance performance, enabling the mechanical performance of the LED display screen to be tested simultaneously under different pressure conditions. (3) In this solution, the electromagnet is activated to emit an inclined downward magnetic force on the side close to the magnetic block, repelling the magnetic block to move outward. While the magnetic block is moving outward, it will also receive a downward repulsive force, enabling it to maintain a certain pressure on the surface of the LED display screen. The repulsive force that causes the magnetic block to move outward is greater than the downward repulsive force, ensuring that the movement of the magnetic block is not restricted. A magnetic isolation plate is installed on the adjacent side of the two magnetic blocks to prevent interference between magnetic forces. The friction block is fixed with diaphragms with different friction coefficients through rectangular blocks, namely a low-friction coefficient diaphragm, a medium-friction coefficient diaphragm, and a high-friction coefficient diaphragm. The low-friction coefficient diaphragm simulates the sliding of soft objects such as fingers and fabrics on the display screen surface to test the friction impact during touch operations or daily cleaning; the medium-friction coefficient diaphragm simulates the contact of ordinary tools with the screen to evaluate the wear resistance of the display screen; the high-friction coefficient diaphragm simulates the scratching or long-term friction of hard objects to test the scratch resistance and durability of the display screen, meeting the test requirements for different usage environments. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the partial structural schematic diagram of the present invention; Figure 3 is the overall structural sectional schematic diagram of the present invention; Figure 4Schematic diagram of the moving air frame structure of the present invention; Figure 5 Schematic cross-sectional view of the test block structure of the present invention; Figure 6 Schematic diagram of the electromagnet structure of the present invention; Figure 7 Schematic diagram of the local pressing block structure of the present invention; Figure 8 Schematic diagram of the split pressing block structure of the present invention; Figure 9 Schematic diagram of the friction block structure of the present invention.

[0018] Explanation of the reference numerals in the figure: 1. Test box; 101. Support legs; 102. Sealed box door; 2. Electric push rod; 3. Moving air frame; 4. Temperature control pipe; 401. Hose; 402. Cold air pipe; 403. Hot air pipe; 404. Input pipe; 405. Air guide plate; 406. Heat conducting bottom plate; 407. L-shaped positioning plate; 5. Test block; 501. Integral pressing block; 502. Rectangular sliding groove; 503. Local pressing block; 504. Conical air duct; 505. Electric valve; 506. Limit groove; 507. Limit rod; 508. Friction block; 5081. Moving block; 5082. Low friction coefficient diaphragm; 5083. Medium friction coefficient diaphragm; 5084. High friction coefficient diaphragm; 5085. Smooth reference surface; 509. Magnetic block; 510. Electromagnet; 511. Magnetic isolation plate. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; 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. Embodiment

[0020] Please refer to Figures 1-3 , a test device for an LED display screen, including a test box 1, a temperature control pipe 4 and a test block 5. Two electric push rods 2 are symmetrically and fixedly connected to the top of the inner cavity of the test box 1, and the lower ends of the electric push rods 2 are fixedly connected to a moving air frame 3.

[0021] Specifically, a plurality of support legs 101 are uniformly and fixedly connected to the lower surface of the test box 1. Anti-slip pads are fixedly connected to the lower ends of the support legs 101. A sealed box door 102 is installed on the front surface of the test box 1. The moving air frame 3 is a rectangular block with a hollow interior.

[0022] Further, the operator first places the test chamber 1 on a designated workplace through the support legs 101. The test chamber 1 provides a closed test environment to prevent external interference. It is made of stainless steel, with good corrosion resistance and stability. The support legs 101 support the entire device and adjust the horizontal height. They are made of aluminum alloy, which is lightweight and strong. The airtight chamber door 102 ensures the airtightness of the test environment and avoids the influence of external factors on the test results. It is made of silicone rubber sealing strips and a stainless steel frame.

[0023] The electric push rod 2 drives the movable air frame 3 to move up and down to apply pressure to the LED display screen. It is composed of high-strength carbon steel and stainless steel. The inside of the movable air frame 3 is designed with a hollow structure to allow air flow. It is made of aluminum alloy, which is both lightweight and durable. Embodiment

[0024] Please refer to Figures 1-4 , a test device for an LED display screen, further comprising a temperature control tube 4, including a hose 401 connected to the middle of the upper surface of the movable air frame 3. The upper end of the hose 401 is respectively connected to a cold air duct 402 and a hot air duct 403 through a tee pipe. A plurality of input pipes 404 are symmetrically connected to both sides of the movable air frame 3. Two guide wind plates 405 are symmetrically and fixedly connected to the lower part of the inner cavity of the test chamber 1. A heat-conducting bottom plate 406 is fixedly connected to the bottom of the inner cavity of the test chamber 1. Four L-shaped positioning plates 407 are symmetrically and fixedly connected to the upper surface of the heat-conducting bottom plate 406.

[0025] Specifically, the outer surface of the tee pipe at the upper end of the hose 401 is fixedly connected to the inner cavity of the test chamber 1. The guide wind plates 405 are arranged obliquely downward. The heat-conducting bottom plate 406 is made of heat-conducting material. The inner cavity of the L-shaped positioning plate 407 places the LED display screen to be tested.

[0026] Further, during the test, first place the LED display screen to be tested on the heat-conducting bottom plate 406, and limit the positions of the four corners of the LED display screen through the four L-shaped positioning plates 407 to ensure stability during the test. Then close the airtight chamber door 102, connect the cold air duct 402 and the hot air duct 403 to an external cold air source and hot air source respectively, and convey cold and hot air flows into the test chamber 1 through the cold air duct 402 and the hot air duct 403 and enter the inside of the movable air frame 3.

[0027] Then enter the test chamber 1 through a plurality of input pipes 404. Under the action of the obliquely arranged guide wind plates 405, the vertically downward air flow is guided to blow onto the surface of the LED display screen and evenly distributed in the box. The heat-conducting bottom plate 406 contacts the hot air and quickly conducts the heat to the bottom of the LED display screen, assisting in evenly conducting cold and heat to the LED display screen, simulating high and low temperature environments in the natural environment. The airtight environment can prevent external interference and protect the consistency of the test environment, and can simultaneously test the measurement results of the LED display screen in complex environments such as high temperature / low temperature.

[0028] The hose 401 is made of silica gel, resistant to high and low temperatures, and is connected to the cold / hot air ducts. It can move up and down in cooperation with the movable air frame 3. The cold air duct 402 and the hot air duct 403 are made of copper pipes (with fast heat conduction) + stainless steel outer layers (anti-freezing / high temperature resistance), and are connected to the external cold air source and hot air source. The lower end of the input pipe 404 is vertically downward, facing the upper side of the inclined air deflector 405. The air is guided by the air deflector 405 to blow inward on the surface of the LED display screen. The heat conduction bottom plate 406 is made of heat-conducting material, and the L-shaped positioning plate 407 is used to fix the position of the LED display screen. Embodiment

[0029] Please refer to Figures 1-9 , a test device for an LED display screen, further comprising a test block 5, including an integral pressing block 501 fixedly connected to the middle of the lower surface of the movable air frame 3. A plurality of rectangular chutes 502 are symmetrically opened on the lower surface of the integral pressing block 501. A partial pressing block 503 is installed in the inner cavity of the rectangular chute 502. A plurality of tapered air ducts 504 are evenly opened in the inner cavity of the integral pressing block 501. The tapered air ducts 504 communicate the movable air frame 3 with the rectangular chute 502. Electric valves 505 are installed on the inner walls of the tapered air ducts 504. Two friction blocks 508 are symmetrically installed in the inner cavity of the lower surface of the partial pressing block 503. Two electromagnets 510 are symmetrically embedded and fixed above the inner cavity of the partial pressing block 503. A magnetic block 509 is embedded and fixed in the inner cavity of the friction block 508.

[0030] Specifically, rectangular grooves are symmetrically opened on both sides of the inner cavity of the rectangular chute 502. Rectangular blocks are symmetrically arranged on both sides of the partial pressing block 503. The partial pressing block 503 is slidably connected to the rectangular chute 502 through the cooperation of the rectangular blocks and the rectangular grooves. Two limiting rods 507 are symmetrically fixedly connected to one side of the friction block 508. Four limiting grooves 506 are symmetrically opened on both sides of the partial pressing block 503. The limiting rods 507 are slidably connected to the limiting grooves 506. The friction block 508 includes a rectangular block 5081 movably connected to the lower inner cavity of the partial pressing block 503. A low friction coefficient film 5082, a medium friction coefficient film 5083, and a high friction coefficient film 5084 are respectively embedded and fixed in the inner cavity of the lower surface of the rectangular block 5081. A smooth comparison surface 5085 is provided between the low friction coefficient film 5082 and the medium friction coefficient film 5083. A smooth comparison surface 5085 is also provided between the medium friction coefficient film 5083 and the high friction coefficient film 5084. The two electromagnets 510 are respectively located above the mutually approaching sides of the two magnetic blocks 509. The electromagnets 510 are magnetically connected to the magnetic blocks 509. L-shaped magnetic isolation plates 511 are installed on the outer surfaces of the two electromagnets 510. The magnetic isolation plates 511 are L-shaped and are respectively fixedly connected to the upper surface and the inner side surface of the electromagnets 510.

[0031] Further, start the electric push rod 2 to drive the moving air frame 3 to move downward. The hose 401 can move synchronously with the moving air frame 3. When the moving air frame 3 moves downward, it drives the test block 5 to move downward to perform a compressive strength test on the LED display screen.

[0032] Test 1: Apply uniform and comprehensive pressure to the LED display screen by moving the integral pressing block 501 downward to test the overall compressive strength of the LED display screen and simulate the long-term load-bearing or external pressure on the display screen; Test 2: While the LED display screen is undergoing an overall impact resistance test through the integral pressing block 501, open the electric valve 505 installed on the inner wall of a certain conical air duct 504. At this time, cold and hot air accelerate into the rectangular chute 502 through the conical air duct 504, pushing the local pressing block 503 downward. Test the situation where the LED display screen is under overall pressure and additional pressure is applied to local positions, simulating the situation where the LED display screen located in the external environment is under the pressure of strong wind on a windy day, and at the same time, the strong wind carries objects such as stones or branches that additionally impact the LED display screen. A sealing plug is installed on the upper surface of the local pressing block 503 to ensure airtightness and prevent cold and hot air from leaking through the gaps. The local pressing block 503 ensures a smooth moving path through the cooperation of the slider and the chute; Test 3: When the LED display screen is placed flat normally, open the electric valve 505 installed on the inner wall of a certain conical air duct 504. At this time, cold and hot air accelerate into the rectangular chute 502 through the conical air duct 504, pushing the local pressing block 503 downward to apply local pressure to the edge or specific area of the LED display screen and test the local pressure resistance performance, simulating the situation where the local position of the LED display screen is under pressure impact during use and testing the mechanical properties of the LED display screen under different pressure conditions.

[0033] When the local pressing block 503 abuts against the surface of the LED display screen, start the electromagnet 510 at this time, so that it emits an inclined downward magnetic force close to the side of the magnetic block 509, repelling the magnetic block 509 to move outward. Since the range of the inclined downward magnetic force emitted by the electromagnet 510 is between 15° and 45°, when the magnetic block 509 moves outward, it will also receive a downward repulsive force, enabling it to maintain a certain pressure on the surface of the LED display screen while moving outward. The repulsive force that causes the magnetic block 509 to move outward is greater than the downward repulsive force, ensuring that the movement of the magnetic block 509 is not restricted. A magnetic separator 511 is installed on the adjacent side of the two magnetic blocks 509 to prevent interference between magnetic forces.

[0034] The friction block 508 is fixed with diaphragms of different friction coefficients through the rectangular block 5081, including the low-friction coefficient diaphragm 5082, the medium-friction coefficient diaphragm 5083, and the high-friction coefficient diaphragm 5084. It simulates the situation when objects with different roughness slide on the surface of the LED display screen. The low-friction coefficient diaphragm 5082 simulates the sliding of soft objects such as fingers and fabrics on the display screen surface to test the friction impact during touch operations or daily cleaning; the medium-friction coefficient diaphragm 5083 simulates the contact of ordinary tools such as cleaning tools and slight scratching objects with the screen to evaluate the wear resistance of the display screen; the high-friction coefficient diaphragm 5084 simulates the scratching or long-term friction of hard objects such as keys and metal sheets to test the scratch resistance and durability of the display screen, meeting the test requirements of different usage environments. Through the three friction coefficient diaphragms and the control surface, it can simulate the full scenario from "low friction" to "high friction", covering extreme situations such as users' daily use and accidental scratches. Smooth control surfaces 5085 are installed at the adjacent interval positions of the low-friction coefficient diaphragm 5082, the medium-friction coefficient diaphragm 5083, and the high-friction coefficient diaphragm 5084 as a frictionless benchmark to compare and test the differences. The friction block 508 ensures a smooth movement path through the cooperation of the limit groove 506 and the limit rod 507.

[0035] After the test is completed, use a high-resolution digital camera or microscope to take detailed pictures of the screen surface, especially the areas after the friction test. This method can help identify whether there are obvious scratches, abrasions, or other physical damages on the surface, and use professional image processing software to analyze the taken pictures to evaluate the color consistency and brightness change of the screen. Any color deviation or brightness decrease problems caused by friction can be found by comparing the pictures before and after the test.

[0036] Working principle: During the use of the device, the operator first places the test box 1 on the designated workplace through the support legs 101. During the test, first place the LED display screen to be tested on the heat-conducting bottom plate 406, and limit the positions of the four corners of the LED display screen through the four L-shaped positioning plates 407 to ensure stability during the test. Then close the airtight box door 102, connect the cold air pipe 402 and the hot air pipe 403 to the external cold air source and hot air source respectively, and convey cold and hot airflows into the test box 1 through the cold air pipe 402 and the hot air pipe 403. The airflows enter the inside of the movable air frame 3 and then enter the test box 1 through multiple input pipes 404. Under the action of the inclined air guide plate 405, the vertically downward airflows are guided to blow on the surface of the LED display screen and are evenly distributed in the box. The heat-conducting bottom plate 406 contacts the hot air and quickly conducts the heat to the bottom of the LED display screen, assisting in evenly conducting cold and heat to the LED display screen, simulating high and low temperature environments in the natural environment. The airtight environment can prevent external interference and protect the consistency of the test environment, and can simultaneously test the measurement results of the LED display screen in complex environments such as high temperature / low temperature.

[0037] Then start the electric push rod 2 to drive the moving air frame 3 to move downward. The hose 401 can move synchronously with the moving air frame 3. When the moving air frame 3 moves downward, it drives the test block 5 to move downward to perform a compressive strength test on the LED display screen; Test 1: Move the overall pressing block 501 downward to apply uniform and comprehensive pressure to the LED display screen to test the overall compressive capacity of the LED display screen, simulating the situation where the display screen bears weight for a long time or is subjected to external pressure; Test 2: While the LED display screen is undergoing an overall compressive test through the overall pressing block 501, open the electric valve 505 installed on the inner wall of a certain conical air duct 504. At this time, cold and hot air accelerate into the rectangular chute 502 through the conical air duct 504, pushing the local pressing block 503 downward to test the situation where the LED display screen is subjected to additional pressure at local positions while being under overall pressure, simulating the situation where the LED display screen located in the external environment on a windy day is under the pressure of strong wind, and at the same time, the strong wind carries objects such as stones or branches that additionally impact the LED display screen. A sealing plug is installed on the upper surface of the local pressing block 503 to ensure airtightness and prevent cold and hot air from leaking out through the gaps. The local pressing block 503 ensures a smooth moving path through the cooperation of the slider and the chute; Test 3: When the LED display screen is placed flat normally, open the electric valve 505 installed on the inner wall of a certain conical air duct 504. At this time, cold and hot air accelerate into the rectangular chute 502 through the conical air duct 504, pushing the local pressing block 503 downward to apply local pressure to the edge or specific area of the LED display screen to test the local pressure resistance performance, simulating the situation where the LED display screen is subjected to external impact at local positions during use.

[0038] When the local pressing block 503 abuts against the surface of the LED display screen, start the electromagnet 510 at this time, so that it emits an inclined downward magnetic force on the side close to the magnetic block 509, repelling the magnetic block 509 to move outward. Since the range of the inclined downward magnetic force emitted by the electromagnet 510 is between 15° and 45°, when the magnetic block 509 moves outward, it will also receive a downward repulsive force, enabling it to maintain a certain pressure on the surface of the LED display screen while moving outward. The repulsive force that causes the magnetic block 509 to move outward is greater than the downward repulsive force, ensuring that the movement of the magnetic block 509 is not restricted. A magnetic isolation plate 511 is installed on the adjacent surface of the two magnetic blocks 509 to prevent interference between magnetic forces.

[0039] The friction block 508 is fixed with diaphragms having different friction coefficients through the rectangular block 5081, including the low-friction coefficient diaphragm 5082, the medium-friction coefficient diaphragm 5083, and the high-friction coefficient diaphragm 5084, to simulate the situation when objects with different roughness slide on the surface of the LED display screen. The low-friction coefficient diaphragm 5082 simulates the sliding of soft objects such as fingers and fabrics on the display screen surface to test the friction impact during touch operations or daily cleaning; the medium-friction coefficient diaphragm 5083 simulates the contact of ordinary tools such as cleaning tools and slight scratching objects with the screen to evaluate the wear resistance of the display screen; the high-friction coefficient diaphragm 5084 simulates the scratching or long-term friction of hard objects such as keys and metal sheets to test the scratch resistance and durability of the display screen, meeting the test requirements of different usage environments. Through the three friction coefficient diaphragms and the reference surface, the full scenario from "low friction" to "high friction" can be simulated, covering extreme situations such as users' daily use and accidental scratches.

[0040] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention 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.

[0041] 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 implementation manners that can be understood by those skilled in the art.

Claims

1. A testing device for an LED display screen, characterized in that: Comprising: A test chamber (1), at the top of the inner cavity of the test chamber (1), two electric push rods (2) are symmetrically and fixedly connected, and at the lower end of the electric push rods (2), a movable air frame (3) is fixedly connected; A temperature control pipe (4), including a flexible pipe (401) connected to the middle of the upper surface of the movable air frame (3), the upper end of the flexible pipe (401) is respectively connected to a cold air pipe (402) and a hot air pipe (403) through a three-way pipe, a plurality of input pipes (404) are symmetrically connected to both sides of the movable air frame (3), two air guide plates (405) are symmetrically and fixedly connected to the lower part of the inner cavity of the test chamber (1), a heat-conducting bottom plate (406) is fixedly connected to the bottom of the inner cavity of the test chamber (1), and four L-shaped positioning plates (407) are symmetrically and fixedly connected to the upper surface of the heat-conducting bottom plate (406); A test block (5), including an integral pressing block (501) fixedly connected to the middle of the lower surface of the movable air frame (3), a plurality of rectangular sliding grooves (502) are symmetrically arranged on the lower surface of the integral pressing block (501), a partial pressing block (503) is installed in the inner cavity of the rectangular sliding groove (502), a plurality of tapered air ducts (504) are evenly arranged in the inner cavity of the integral pressing block (501), the tapered air ducts (504) communicate the movable air frame (3) with the rectangular sliding groove (502), an electric valve (505) is installed on the inner wall of the tapered air duct (504), two friction blocks (508) are symmetrically installed in the inner cavity of the lower surface of the partial pressing block (503), two electromagnets (510) are symmetrically inlaid and fixed above the inner cavity of the partial pressing block (503), and a magnetic block (509) is inlaid and fixed in the inner cavity of the friction block (508).

2. The testing device for an LED display screen according to claim 1, wherein: A plurality of support legs (101) are evenly fixedly connected to the lower surface of the test chamber (1), an anti-slip pad is fixedly connected to the lower end of the support legs (101), and an airtight box door (102) is installed on the front surface of the test chamber (1).

3. The testing device for an LED display screen according to claim 1, wherein: The movable air frame (3) is a rectangular block with a hollow interior, the outer surface of the three-way pipe at the upper end of the flexible pipe (401) is fixedly connected to the inner cavity of the test chamber (1), and the air guide plate (405) is arranged obliquely downward.

4. The test device for an LED display screen according to claim 1, characterized in that: The heat-conducting bottom plate (406) is made of a heat-conducting material, and an LED display screen to be tested is placed in the inner cavity of the L-shaped positioning plate (407).

5. The testing device for an LED display screen according to claim 1, characterized in that: Rectangular grooves are symmetrically arranged on both sides of the inner cavity of the rectangular sliding groove (502), rectangular blocks are symmetrically arranged on both sides of the partial pressing block (503), and the partial pressing block (503) is slidably connected to the rectangular sliding groove (502) through the cooperation of the rectangular blocks and the rectangular grooves.

6. The test device for an LED display screen according to claim 1, characterized in that: Two limiting rods (507) are symmetrically fixedly connected to one side of the friction block (508), four limiting grooves (506) are symmetrically arranged on both sides of the partial pressing block (503), and the limiting rods (507) are slidably connected to the limiting grooves (506).

7. The test device for an LED display screen according to claim 1, characterized in that: The friction block (508) includes a moving block (5081) movably connected to the lower inner cavity of the partial pressing block (503), a low friction coefficient film (5082), a medium friction coefficient film (5083) and a high friction coefficient film (5084) are respectively inlaid and fixed in the lower inner cavity of the moving block (5081).

8. The testing device for an LED display screen according to claim 7, wherein: A smooth comparison surface (5085) is provided between the low friction coefficient diaphragm (5082) and the medium friction coefficient diaphragm (5083), and a smooth comparison surface (5085) is also provided between the medium friction coefficient diaphragm (5083) and the high friction coefficient diaphragm (5084).

9. The test device for an LED display screen according to claim 1, characterized in that: The two electromagnets (510) are respectively located above the sides of the two magnetic blocks (509) close to each other, and the electromagnets (510) are magnetically connected to the magnetic blocks (509).

10. The testing device for an LED display screen according to claim 9, characterized in that: Magnetic shielding plates (511) are installed on the outer surfaces of the two electromagnets (510). The magnetic shielding plates (511) are L-shaped and are fixedly connected to the upper surfaces and inner sides of the electromagnets (510) respectively.

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