Three reasons to distinguish between monitors and TVs
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First, image clarity: Since the traditional TV receives the RF signal transmitted by the TV station, the video image bandwidth corresponding to this signal is usually less than 6M, so the resolution of the TV is usually greater than 400 lines, requiring the monitor to have a higher The image clarity, so the professional monitor should have a bandwidth compensation and boost circuit on the channel circuit compared to the traditional TV set, which makes the passband wider and the image clarity higher.
The second is the degree of color reproduction. If the definition is mainly determined by the amplitude-frequency characteristics of the video channel, the degree of reduction mainly consists of the chromaticity of the three primary colors of red (R), green (G), and blue (B) in the monitor. The phase of the signal and luminance signal is determined. Since the monitor usually observes a static image, the color reproduction degree of the monitor is higher than that of the TV. Therefore, the viewing channel of the professional monitor should have the brightness, chromaticity processing, and R, G, and B processing. Precise compensation circuit and delay circuit to ensure the phase synchronization of the bright/color signal and the R, G, and B signals.
The third is the stability of the whole machine: when the monitor constitutes a closed-circuit monitoring system, it usually needs 24 hours a day, 365 days a year for continuous uninterrupted power-on (the TV usually only works for a few hours a day), and some monitor applications The environment may be harsh, which requires higher reliability and stability of the monitor. Compared with TV sets, the monitor's current, power consumption, temperature and resistance to electrical interference, electric shock capability and margin, and average trouble-free operation time are much larger than TV sets, and monitors must also The use of a fully shielded metal casing ensures electromagnetic compatibility and interference performance; in the selection of components, the components used in the monitor have higher voltage, current, temperature, humidity and other characteristics than the components used in the TV; In the installation, debugging, especially the process requirements of components and aging, the requirements of the monitor are also higher. When the TV is manufactured, the aging of the whole machine is usually about 8 hours at room temperature on the assembly line, and the whole machine of the monitor For aging, it is necessary to electrify and aging for more than 24 hours in the aging line of high temperature and high humidity sealed environment to ensure the stability of the whole machine.
It can be seen from the above analysis that if a television set is used as the terminal monitor of the monitoring system, the components used in the television are not suitable for use except that the image may be blurred (lower definition and poor color reproduction). Requirements for intermittent use. If you force the use of a TV as a monitor. Light is prone to malfunctions, and in severe cases, accidents may occur due to excessive operating temperature of the TV.