A, sharp contrast
The unit of calculation of the sharpness is the "line", which is generally referred to as the number of lines the television can discriminate in the horizontal direction. Since the traditional TV receives the RF signal emitted by the TV station, the bandwidth of the video image corresponding to this signal is usually less than 6M. Therefore, the CRT TV resolution of the old-fashioned CRT TV is usually only about 400 lines. Imagine that we purchased The HD 540 line or even the 600 line analogue surveillance camera thought that it could be more clear, but if it is used with a TV, it can only reach the level of 400 lines. We have to know that often 540 lines of cameras can buy 2 420 lines of products. It is not a waste, but the monitor can easily do this, generally have a higher image clarity, are 600 lines to start, so the professional monitor in the channel circuit than the traditional TV should have Bandwidth compensation and boost circuits allow for wider pass bands and higher image resolution, with some slightly better products reaching the 1250 line standard.
Second, the color contrast
If the definition is mainly determined by the amplitude characteristics of the video channel, then the color reproduction is mainly determined by the phase signals of the chrominance signals and luminance signals of the three primary colors in the monitor. The components of the monitor and the civilian TV are basically the same as the three major components (phosphors, tubes, and color circuit matrix). However, this seemingly the same three major items caused the essential difference between the monitor and the TV. The TV uses P22 phosphor. The color gamut of this type of phosphor is not completely defined at all, so based on this kind of phosphor The colors represented by the TVs are changed by different manufacturers; the phosphors used in the monitors are phosphors that strictly comply with the EBU standard defined by the color gamut, and their color blocks composed of three primary colors are all strictly enforced. The division and definition, so it can accurately reproduce the true color. Since the monitor usually observes static images, the requirement for the color reproduction of the monitor is higher than that of the television. Therefore, the viewing channel of the professional monitor should have precise compensation circuits and delay in terms of brightness and color processing. The circuit, to ensure that the phase of the light/color signal and the three primary color signals are in phase synchronization, the monitor has to faithfully reproduce the original signal. The minor errors can be seen on the monitor and the monitor must be accurate.
Third, stability and contrast
When a monitor forms a closed-circuit monitoring system, it usually requires 24 hours a day and 365 days of continuous power-on work every year (while televisions usually only work a few hours per day), and the application environment of some monitors may be poor. It requires more reliability and stability of the monitor. Compared with televisions, in terms of design, the monitor's current, power consumption, temperature and resistance to electrical interference, the ability and margin of electrical shock, and the average time between failures are far greater than those of televisions. At the same time, the monitor must also use a fully shielded metal enclosure to ensure electromagnetic compatibility and interference performance. In the selection of components, the characteristics of the components used in the monitor, such as voltage resistance, current, temperature, and humidity, are higher than those used by the television. In the installation and debugging, especially the aging of the components and the whole process requirements, the monitor's requirements are also higher. When a television is manufactured, the aging of the whole machine is usually about 8 hours at the normal temperature on the assembly line. The aging of the whole monitor needs to be electrified for more than 24 hours in the aging line of a high-temperature, high-humidity confined environment to ensure the entire machine. stability.
to sum up
From the above analysis, if you use a TV as a terminal monitor of a monitoring system, it is not a wise choice. It wastes the clarity of the camera itself. It may also result in blurred images, low definition, and poor color reproduction. And so on, in addition the components used in the TV are not suitable for continuous use without interruptions. In severe cases, accidents may occur due to the high operating temperature of the TV.
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