Common signal interference factors and solutions for LED display screens

As a terminal device display system, LED displays have attracted much attention in the sales market. With the improvement of assembly technology, the main uses of LED displays continue to expand. At present, they have already crossed every field such as gaming and entertainment, government departments, exhibition halls, transportation, power and energy, finance, broadcasting and television networks, etc. The shadow of LED displays can often be seen in people's daily affairs and life.

When LED displays are subjected to signal interference, displaying information on the display interface can cause significant harm. For example, when subjected to electrostatic interference, the large screen display interface usually exhibits multiple wireframe wavy lines; When there are several horizontal bars with the same spacing on the interface of the display, it is generally a common fault condition caused by the mismatch of the characteristic impedance of the network lines.

According to many years of experience exchange among technical engineers, the reasons for the impact are generally as follows:

1. The quality of the video network cable is not very good;

2. There are strong interference signals near the system software;

3. Short circuit faults and common faults caused by short circuits in copper core cables of video network cables;

4. Common faults caused by mismatched characteristic impedances of network cables;

5. The impact of indoor space radiation sources imported through network cables.

6. Common faults caused by switching power supplies in power supply and distribution systems.

Here is a brief analysis of the solutions for signal interference caused by the mentioned elements

1. Product quality issues with video network cables. The resistor of this type of surveillance video cable is too large, which causes a significant attenuation coefficient in the data signal and exacerbates common faults. In addition, the characteristic impedance of such monitoring video lines exceeding the requirements is also one of the reasons for common faults.

2. The interference signal around the system software is too strong. Solution to grounding devices for video network cable pipelines.

3. Short circuit fault of copper core cable in video network cable. When such common faults occur, LED displays are usually not easily affected by various data signals of the entire system software, but only appear in the areas of these network cable crystal heads. If you carefully inspect these connectors one by one, you can solve them.

4. Common faults caused by mismatched characteristic impedances of network cables. In such situations, it is recommended to buy Class 5 or Class 6 Ethernet cables from well-known brands, which are often of lower quality.

5. The impact of indoor space radiation sources imported through network cables. The solution to such situations is to have a certain understanding of the surrounding environment when creating the system software, and try to find ways to avoid or eliminate radioactive substances as much as possible. Separate the network cable from the power plug and string a separate rubber hose.

6. The problem of switch mode power supply in power supply and distribution system. Adding electromagnetic interference to all normal switching power supplies, in such situations, if a purified power supply or online UPS power supply system is selected for all system software of the LED display, most of it can be processed.