As a mainstream display device, the application field of LCD splicing wall system is becoming more and more extensive. Although the LCD splicing screen is powerful enough to scan into different industries, any product is not perfect and will be used more or less in the process. The problem is that this is also the reason for the continuous advancement of technology. LCD splicing screens have always followed the market not having the best, only better, as it is today. Volino today gave an important introduction to the two most likely interferences when using LCD splicing screens:
1. Reflection interference: Generally, the chroma, height and saturation of the video signal will be attenuated during transmission. When the impedance of the coaxial network that transmits the video does not match, the video signal will be transmitted to the terminal with partial chroma, brightness and saturation. A micro-reflection is generated, and the reflected signal will be transmitted back to form a re-reflection, which is superimposed with the video signal and reaches the terminal through delay and loss. In particular, the reflected signals between multiple LCD splicing screens will cause inter-symbol interference (ISI) at the receiving end. ISI will cause the LCD splicing screen to receive the wrong input signal amplitude and phase and display it, which will make the transmitted image look clear and the image is covered with a blurred image phenomenon, which is a ghosting phenomenon.
2. Electrostatic interference: Especially in power plants, coal mines and industrial enterprises, there are high voltage (above 1000V) output, severe mechanical friction and high electromagnetic environment ground potential difference between 400VP-P~1500VP-P. The phenomenon of the potential difference between the ground and the ground is an electrostatic phenomenon. When there is static electricity, the ground terminal (including cold ground and hot ground) and the ground wire are equivalent to capacitors with positive and negative charges. According to the working principle of the capacitor, it is known that the charging capacity will be discharged when it reaches a certain level. Then, when the electrostatic discharge is performed, a potential difference is formed between the different ground terminals, so that the shielding layer on the transmission line of the LCD splicing screen forms a ground current, so that the interference signal is coupled to the video signal and sent to the monitoring equipment. The interference of static electricity on video transmission depends on the magnitude of the static voltage difference. In severe cases, the interface chip may be damaged or damaged, so the image may be textured or noisy, and sometimes not.
