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Talking about the Causes of Disturbance Caused by LCD Panels
LCD splicing screen is widely used in the display rooms of enterprises and institutions, Pingan City Command Center, railway (subway), port, dock monitoring system, intelligent traffic management monitoring center, national defense or military surveillance system, power dispatch monitoring system, large-scale factory and mine monitoring system , financial management monitoring systems, television or large studios to monitor the curtain wall, large venues for performance background walls, video conferencing, and bars, airports, schools, terminals, banks and telecommunications business halls, etc.. In the daily use of the splicing screen users often meet Various phenomena can not be properly displayed and mistakenly believe that the LCD splicing screen is damaged.
When the LCD splicing screen is disturbed, we will see the appearance of water ripple, vertical stripes, wood grain, and multi-line ripples on the splicing screen. The following common factors causing the LCD splicing to interfere with:
(1) Due to the power supply of the power supply system. The interference signal is superimposed on the normal power supply, and the interference signal on this power supply is mostly from the equipment using thyristors in the power grid. The solution to this situation is relatively simple, as long as the entire system of the LCD splicing screen can be solved by using a clean power supply or on-line UPS power supply.
(2) Spatial radiation interference introduced by transmission lines. This interference phenomenon is mostly caused by strong, high-frequency spatial radiation sources near the transmission system, the system front-end, or the central control room. One of the solutions to this situation is to understand the surrounding environment when the system is established, and try to avoid or stay away from the radiation source.
(3) There is a strong source of interference near the system. This can be judged through investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera and to ground the pipeline of the video cable.
(4) The failure phenomenon due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. The solution to this problem is usually solved by means of "connected resistors at the beginning" or "connected resistors at the terminals."
(5) The quality of the video transmission line is not good, especially the shielding performance is poor (the shielding network is not a good quality copper network, or the shielding network is too thin to be shielded); at the same time, the line of this kind of video line The resistance is too large, thus causing a large attenuation of the signal is also aggravating the cause of the fault. In addition, the characteristic impedance of such a video line is not 75 Ω and one of the causes of the malfunction is that the parameter is out of specification.