EMC (Electro Magnetic Compatibility) testing device for display

Abstract

The utility model discloses an EMC (Electro Magnetic Compatibility) testing device for a display, which comprises a shielding chamber capable of shielding external interference signals, a test board fixed on the ground of the shielding chamber, close to the middle of the shielding chamber and used for stably placing the display to be detected, an interference signal transmitting assembly, a signal receiving assembly and a signal processing assembly, comprising a ground rail, a mobile platform and an interference signal transmitter, the ground rail is mounted on the ground of the shielding room and continuously surrounds the periphery of the test board; the interference signal transmitter is arranged above the mobile platform, and the mobile platform can move along the ground rail. According to the technical scheme of the utility model, by arranging the interference signal transmitting assembly, the test bench and the shielding chamber, the reliability of the EMC test result of the display is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic interference testing, in particular to an EMC testing device for a display. Background Art

[0002] Electromagnetic compatibility (EMC) testing is the process of evaluating the interference resistance of electronic devices in electromagnetic environments. By testing a device's interference resistance in electromagnetic fields of varying frequency bands and intensities, its performance in real-world applications can be assessed. Existing EMC testing of displays uses a traditional test chamber. During testing, the test bench on which the display is mounted rotates continuously, making it difficult for existing testing equipment to accurately simulate the display's actual usage scenario, leading to biased test results. Utility Model Content

[0003] The purpose of the utility model is to provide an EMC testing device for a display, so as to improve the reliability of the EMC test results of the display.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] An EMC test device for a display, comprising:

[0006] Shielded room, which can shield external interference signals:

[0007] The test bench is fixed to the floor of the shielded room and close to the middle of the shielded room, and is used to stably place the display to be tested:

[0008] The interference signal transmitting component includes a ground rail, a mobile platform and an interference signal transmitter; the ground rail is installed on the floor of the shielding room and continuously surrounds the circumference of the test bench; the interference signal transmitter is arranged above the mobile platform, and the mobile platform can move along the ground rail.

[0009] In one embodiment, the interference signal transmitter includes a signal transmitting antenna, a first driving member and a second driving member; the first driving member is used to drive the signal transmitting antenna to rotate; the second driving member is installed on the mobile platform, and the second driving member drives the signal transmitting antenna to move up and down through the first driving member.

[0010] In one embodiment, a camera device is further included, wherein the camera device includes a camera formed of a metal shell, and the camera is installed on the inner wall of the shielding room and faces the display to be tested on the test bench.

[0011] In one embodiment, the camera device also includes a mounting base and a first connecting rod; the mounting base is fixed to the inner wall of the shielding room; one end of the first connecting rod is connected to the mounting base and can rotate relative to the mounting base; the other end of the first connecting rod is connected to the camera and can also rotate relative to the camera.

[0012] In one embodiment, the camera device further includes an extension rod, one end of which is connected to the first connecting rod and can rotate relative to the first connecting rod; the other end of the extension rod is connected to the camera and can also rotate relative to the camera.

[0013] In one embodiment, a first rotary drive member is provided at the connection between the mounting base and the first connecting rod; a second rotary drive member is provided at the connection between the first connecting rod and the extension rod; a third rotary drive member is provided at the connection between the extension rod and the camera; and the rotating axes of the first rotary drive member, the second rotary drive member and the third rotary drive member are parallel to each other.

[0014] In one embodiment, both the inner wall and the ceiling of the shielding room are provided with wave absorbing structures.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The technical solution of the present utility model improves the reliability of the EMC test results of the display by setting an interference signal transmitting component, a test bench and a shielding room. Specifically, the interference signal transmitting component includes: a ground rail, a mobile platform and an interference signal transmitter. The ground rail is installed on the floor of the shielding room and continuously surrounds the circumference of the test bench; the interference signal transmitter is set above the mobile platform, and the mobile platform can move along the ground rail; so that the mobile platform drives the interference signal transmitter to move in front of, behind, and to the left and right sides of the display to be tested, so as to meet the all-round testing requirements of the display. During the test process, the test bench is fixed and the display to be tested is placed above the test bench, simulating the actual use scenario of the display, avoiding errors caused by unstable connection of the display output signal interface; and avoiding the risk of the display falling from the test bench, thereby improving the overall stability of the EMC test device and the reliability of the test data of the display's anti-interference performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0019] Figure 1 1 is a schematic structural diagram of an embodiment of an EMC testing device for a display;

[0020] Figure 2 is a side view of an embodiment of an EMC testing device for a display;

[0021] Figure 3 for Figure 2 A magnified view of part A in FIG;

[0022] Illustrations: 100, EMC test device for display; 110, shielding room; 111, absorbing structure; 120, test bench; 130, interference signal transmitting component; 131, ground rail; 132, mobile platform; 133, interference signal transmitter; 1331, signal transmitting antenna; 1332, first driving member; 1333, second driving member; 140, camera device; 141, camera; 142, mounting base; 143, first connecting rod; 144, extension rod; 145, first rotating driving member; 146, the second rotating driving member; 147, the third rotating driving member; 20, display. DETAILED DESCRIPTION

[0023] In order to make the technical objectives, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] An embodiment of the present invention provides an EMC testing device 100 for a display.

[0027] See also Figure 1 、 Figure 2 and Figure 3 In one embodiment of the present invention, the EMC testing device 100 for a display includes:

[0028] Shielding room 110, the shielding room 110 can shield external interference signals:

[0029] The test bench 120 is fixed to the floor of the shielding room 110 and close to the middle of the shielding room 110 , and is used to stably place the display 20 to be tested:

[0030] The interference signal transmitting component 130 includes a ground rail 131, a mobile platform 132 and an interference signal transmitter 133; the ground rail 131 is installed on the floor of the shielding room 110 and continuously surrounds the circumference of the test bench 120; the interference signal transmitter 133 is arranged above the mobile platform 132, and the mobile platform 132 can move along the ground rail 131.

[0031] It is understandable that the technical solution of the present invention improves the reliability of the EMC test results of the display 20 by setting up an interference signal emission component 130, a test bench 120 and a shielding room 110. Specifically, the interference signal emission component 130 includes: a ground rail 131, a mobile platform 132 and an interference signal transmitter 133. The ground rail 131 is installed on the ground of the shielding room 110 and continuously surrounds the circumference of the test bench 120; the interference signal transmitter 133 is set above the mobile platform 132, and the mobile platform 132 can move along the ground rail 131; thereby, the mobile platform 132 drives the interference signal transmitter 133 to move in front of, behind, and to the left and right sides of the display 20 to be tested, so as to meet the all-round detection requirements of the display. During the test process, the test bench 120 is fixed and the display 20 to be tested is placed above the test bench 120, simulating the actual usage scenario of the display 20 and avoiding errors caused by unstable connection of the output signal interface of the display 20; and avoiding the risk of the display 20 falling from the test bench 120, thereby improving the overall stability of the EMC test device and the reliability of the test data of the anti-interference performance of the display 20.

[0032] It should be noted that in the above-mentioned technical solution, a spectrum analyzer is typically used to analyze the display signal input to the display 20. Specifically, a physical line signal connection is established between the display signal line input to the display 20 and the spectrum analyzer. The anti-interference performance of the display 20 is then observed and analyzed at the control display terminal of the spectrum analyzer.

[0033] It should also be noted that the mobile platform 132 can be a rail trolley. When the mobile platform 132 is a rail trolley, the ground rail 131 is a double track. In addition, to ensure safety and discharge static electricity, the connection between the rail trolley and the ground rail 131 is equivalent to grounding.

[0034] It should also be noted that in order to reduce the electromagnetic interference signals of high intensity retained in the shielding room 110, reduce the electromagnetic noise in the environment, simulate the electromagnetic environment of natural space, improve measurement accuracy and reduce radiation to the human body; the inner wall and ceiling of the shielding room 110 are provided with an absorbing structure 111.

[0035] Specifically, the absorbing structure 111 may absorb electromagnetic energy by converting it into heat energy, such as graphene, graphite, carbon black, etc. In this case, the absorbing structure 111 may be in the shape of a flat plate.

[0036] Optionally, the absorbing structure 111 can be made of polyurethane foam or non-woven flame-retardant materials to absorb low-frequency waves. When the absorbing structure 111 is made of polyurethane foam or non-woven flame-retardant materials, the absorbing structure 111 can be a pyramidal structure or a wedge-shaped structure to improve the absorption efficiency of low-frequency waves.

[0037] Optionally, the test bench 120 may also be used to place a signal output device of the display 20 , such as a computer host, and common configurations related to the display 20 , such as a printer.

[0038] It should also be understood that the EMC testing device 100 for a display can also be used to test display devices with larger areas, such as televisions, conference machines, LED displays, etc.; or to test electronic products not related to displays.

[0039] See also Figure 1 、 Figure 2 and Figure 3 In a specific embodiment of the present invention, the interference signal transmitter 133 includes a signal transmitting antenna 1331, a first driving member 1332 and a second driving member 1333; the first driving member 1332 is used to drive the signal transmitting antenna 1331 to rotate; the second driving member 1333 is installed on the mobile platform 132, and the second driving member 1333 drives the signal transmitting antenna 1331 to move up and down through the first driving member 1332.

[0040] Specifically, to provide multiple test variables and simulate electromagnetic interference in free space, the first driving member 1332 is used to rotate the signal transmitting antenna 1331. Optionally, the first driving member 1332 is a rotary cylinder, a stepper motor, or a servo motor. To reduce the impact of electromagnetic interference on the operating performance of the first driving member 1332, the first driving member 1332 is a rotary cylinder.

[0041] The second driving member 1333 drives the signal transmitting antenna 1331 to move up and down through the first driving member 1332. Optionally, the second driving member 1333 is a screw motor module or a linear motor module. To improve transmission efficiency and avoid the influence of electromagnetic interference, the second driving member 1333 is optionally a ball screw motor module.

[0042] Furthermore, in order to receive the interference signal for testing, the signal transmitting antenna 1331 is provided on a side of the second driving member 1333 close to the test bench 120 .

[0043] Please continue reading Figure 1 、 Figure 2 and Figure 3 In a preferred embodiment of the present invention, the EMC testing device 100 for a display further includes a camera device 140, wherein the camera device 140 includes a camera 141 composed of a metal shell, and the camera 141 is installed on the inner wall of the shielding room 110 and faces the display 20 to be tested on the test bench 120.

[0044] It should be noted that conventional EMC performance testing of the display 20 relies solely on analysis of data obtained from a spectrum analyzer. This method cannot directly analyze the image signals input to the display 20, resulting in a lack of reference for the results. Therefore, a camera 141 is installed within the shielded room 110 to capture and record video data of the display screen's image display effects. This data, combined with the data obtained from the spectrum analyzer, forms a reference set, thereby ensuring more accurate and reliable results for the EMC performance testing of the display 20.

[0045] Specifically, the camera 141 formed of a metal shell also has a high anti-electromagnetic interference performance, thereby improving the stability of data transmission of the camera 141.

[0046] like Figure 3 As shown, further, the camera device 140 also includes a mounting base 142 and a first connecting rod 143; the mounting base 142 is fixed to the inner wall of the shielding room 110; one end of the first connecting rod 143 is connected to the mounting base 142 and can rotate relative to the mounting base 142; the other end of the first connecting rod 143 is connected to the camera 141 and can also rotate relative to the camera 141.

[0047] It is understandable that the provision of the first connecting rod 143 can extend the distance between the camera 141 and the display 20 , and the rotational connection between the first connecting rod 143 and the camera 141 can adjust the shooting angle of the camera 141 relative to the display 20 .

[0048] Please continue reading Figure 3 Furthermore, the camera device 140 further includes an extension rod 144, one end of which is connected to the first connecting rod 143 and is rotatable relative to the first connecting rod 143; the other end of the extension rod 144 is connected to the camera 141 and is also rotatable relative to the camera 141. It is understood that the provision of the extension rod 144 not only extends the distance between the camera 141 and the display 20, but also expands the adjustable distance range of the camera 141 relative to the display 20. Therefore, the specific position of the camera 141 can be adjusted according to the size and height of the display 20 to obtain better and more valuable video data.

[0049] In one embodiment, a first rotary drive member 145 is provided at the connection between the mounting base 142 and the first connecting rod 143; a second rotary drive member is provided at the connection between the first connecting rod 143 and the extension rod 144; and a third rotary drive member is provided at the connection between the extension rod 144 and the camera 141. The rotation axes of the first rotary drive member 145, the second rotary drive member 146, and the third rotary drive member 147 are parallel to each other. It is understood that when performing EMC testing on the display 20, the position of the display 20 relative to the test bench 120 is relatively fixed to set fixed parameters. Therefore, the parallel rotation axes of the first rotary drive member 145, the second rotary drive member 146, and the third rotary drive member 147 can limit the shooting plane of the camera 141, facilitate the capture of valuable reference video data, and enable testers to observe the actual interference effects on the display 20, thereby improving the accuracy and reliability of the test data.

[0050] Optionally, the first rotary drive member 145, the second rotary drive member 146, and the third rotary drive member 147 can be manually rotated and adjusted to adjust the specific position of the camera 141 to an optimal photographic angle. Optionally, the first rotary drive member 145, the second rotary drive member 146, and the third rotary drive member 147 are servo motors to facilitate an operator to adjust the position of the camera 141 at the control terminal. It is also understood that the interference signal transmitting assembly 130 generally does not operate when the position and angle of the camera 141 are being adjusted.

[0051] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An EMC test device for a display, characterized in that: include: Shielded room, which can shield external interference signals: The test bench is fixed to the floor of the shielded room and close to the middle of the shielded room, and is used to stably place the display to be tested: The interference signal transmitting component includes a ground rail, a mobile platform and an interference signal transmitter; the ground rail is installed on the floor of the shielding room and continuously surrounds the circumference of the test bench; the interference signal transmitter is arranged above the mobile platform, and the mobile platform can move along the ground rail.

2. The EMC testing device for a display according to claim 1, characterized in that: The interference signal transmitter includes a signal transmitting antenna, a first driving member and a second driving member; the first driving member is used to drive the signal transmitting antenna to rotate; the second driving member is installed on the mobile platform, and the second driving member drives the signal transmitting antenna to move up and down through the first driving member.

3. The EMC testing device for a display according to claim 1, wherein: The device further comprises a camera, which comprises a camera formed by a metal shell. The camera is installed on the inner wall of the shielding room and faces the display to be tested on the test bench.

4. The EMC testing device for a display according to claim 3, wherein: The camera device also includes a mounting base and a first connecting rod; the mounting base is fixed to the inner wall of the shielding room; one end of the first connecting rod is connected to the mounting base and can rotate relative to the mounting base; the other end of the first connecting rod is connected to the camera and can also rotate relative to the camera.

5. The EMC testing device for a display according to claim 4, characterized in that: The camera device further comprises an extension rod, one end of which is connected to the first connecting rod and can rotate relative to the first connecting rod; the other end of the extension rod is connected to the camera and can also rotate relative to the camera.

6. The EMC testing device for a display according to claim 5, characterized in that: A first rotating drive member is provided at the connection between the mounting base and the first connecting rod; a second rotating drive member is provided at the connection between the first connecting rod and the extension rod; a third rotating drive member is provided at the connection between the extension rod and the camera; the rotating axes of the first rotating drive member, the second rotating drive member and the third rotating drive member are parallel to each other.

7. The EMC testing device for a display according to claim 1, characterized in that: The inner wall and ceiling of the shielding room are both provided with wave absorbing structures.

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