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When a monitor is used as a monitor terminal of a matrix control system, why is it that the matrix controller switches the image for a period of time when there is no synchronization?
In the monitoring system, if there is a phase difference between the field sync signals in the image signals output from each front-end device (such as a camera), the monitor will display a period of non-synchronization when the matrix controller switches the image signals of each channel. The larger the phase difference, the longer the time that is not synchronized. Therefore, when constructing a monitoring system, it is recommended that the front-end device with GEN-LOOK input should be used as far as possible for the liquid crystal splicing, and all the front-end devices use the external synchronizing mode. That is, the synchronization of the image signals of each channel is subject to the same synchronizing signal. Controls, causing the monitor screen to display synchronization.
When using the monitor to observe the image, why does the image distortion, distortion, line and field synchronization, or even failure of the input signal occur?
1. The monitor's industry standard specifies that the input amplitude of a professional monitor is 1Vp-P±3dB (approximately 0.7Vp-P-1.4Vp-p) and the input impedance is 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
2. Due to the wide range of video frequency, DLP video wall video signals are more susceptible to interference (including 50Hz power interference, electromagnetic interference, etc.) in the transmission process, thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
In recent years, LCD has attracted users' attention with its advantages such as high definition, wide viewing angle, high brightness, and long lifespan. However, some common problems of DLP splicing have gradually surfaced.