As a terminal device display system, LED display has attracted much attention in the sales market. With the improvement of patchwork technology, the main uses of LED display continue to expand. At this stage, it has already crossed every field, such as game and entertainment, government departments, exhibition halls, transportation, electric energy, financial industry, radio and television network, in our daily affairs We can often see the shadow of LED display in our daily life.
When the LED display is subjected to signal interference, it will cause significant harm to the display information on the display interface. For example, when it is subjected to electrostatic interference, the large screen display interface usually has multi wireframe wavy lines; When there are several horizontal bars with the same interval on the interface of the display, it is generally a common fault condition caused by the mismatch of the characteristic impedance of the network line.
According to the experience exchange of technical engineers for many years, the general reasons for the impact are as follows:
1. The quality of video network cable is not very good;
2. There is strong interference signal near the system software;
3. Short circuit fault of copper core cable of video network cable and common fault caused by short circuit;
4. Common faults caused by mismatched characteristic impedance of network lines;
5. The influence of indoor space radiation source introduced by network line.
6. Common faults caused by switching power supply of power supply and distribution system.
Here, a simple analysis is made on the solution when the above elements cause signal interference
1. Product quality problems of video network line. The line resistor of this kind of monitoring video line is too large, resulting in large attenuation coefficient of data signal, which is also the reason to aggravate common faults. In addition, the main parameters of characteristic impedance of this kind of monitoring video line exceed the requirements, which is also one of the reasons for common faults.
2. The interference signal around the system software is too strong. The pipeline of video network line shall be grounded and solved by the grounding device.
3. Short circuit fault and short circuit fault of copper core cable of video network cable. When this kind of common fault occurs, the LED display is usually not easy to be a problem with the data signals of all sectors of the system software, but only in the area of these network cable crystal heads. If you carefully check this connector one by one, you can deal with it.
4. Common faults caused by mismatched characteristic impedance of network lines. In this kind of situation, I propose to buy class 5 or class 6 network cables of well-known brands, which are more inferior to the quality of network cables.
5. The influence of indoor space radiation source introduced by network line. The solution to this kind of situation is to have a certain grasp of the surrounding environment when the system software is created, and try to bypass or eliminate radioactive substances as much as possible. The network cable is separated from the power plug, and a separate string of rubber hose is used.
6. Switching power supply problems in power supply and distribution systems. Electromagnetic interference is superimposed on all normal switching power supplies. In case of such situations, most of them can be handled if purified power supply or online UPS power supply system is selected for all system software of LED display.
