Common Interference Factors And Solutions For LCD Splicing Screen Images

When the LCD splicing screen is interfered with, we may see phenomena such as water ripples, vertical lines, wood grain patterns, and multiple line wave patterns on the screen. Below, the LCD splicing screen manufacturer analyzes the common factors causing interference on the LCD splicing display screen and the solutions:

1.  It is caused by the power supply system.

Interference signals are superimposed on the normal power supply, which mostly come from devices using thyristors in the same power grid. The solution to this problem is relatively simple; just purify the power supply for the entire LCD splicing screen system or use an online UPS for power supply, and the problem can be basically solved.

2. It is caused by the mismatch of characteristic impedance of the transmission line.

This phenomenon manifests as several equally spaced vertical bars of interference on the screen of the splicing screen, and the frequency of the interference signal is basically an integer multiple of the line frequency. The general solution is to use "series resistor at the beginning" or "parallel resistor at the end" methods.

3. There is a strong source of interference near the system.

This can be judged through investigation and understanding. If it belongs to this reason, the solution is to strengthen the shielding of the camera and ground the pipeline of the video cable.

4. It is spatial radiation interference introduced by the transmission line.

The occurrence of this kind of interference phenomenon is mostly because there are strong and high-frequency spatial radiation sources near the transmission system, the front end of the system, or the central control room. One solution to this situation is to understand the surrounding environment when establishing the system and try to avoid or stay away from radiation sources as much as possible.

5. The quality of the video transmission line is poor.

Especially the shielding performance is poor (the shielding net is not a copper wire net of good quality, or the shielding net is too sparse to play a shielding role); at the same time, the line resistance of this kind of video line is too large, thus causing greater signal attenuation is also a reason for aggravating faults. In addition, if the characteristic impedance of this kind of video line is not 75Ω and the parameters exceed the regulations, it is also one of the reasons for the fault.