The difference between monitor and TV

2021-01-05 12:23:33 hongling

The difference between monitor and TV


 


The function of the TV is simpler than that of the TV, but in terms of performance, the requirements are higher than that of the TV. The main difference is reflected in the three "degrees".




Image clarity






Since traditional TV sets receive the radio frequency signal emitted by the TV station, the video image bandwidth corresponding to this signal is usually less than 6M, so the definition of the TV is usually greater than 400 lines, and the monitor is required to have higher image definition. Compared with traditional TV sets, professional monitors should have bandwidth compensation and boost circuits on the channel circuit to make the passband wider and the image clearer.




Color reproduction




If the definition is mainly determined by the amplitude-frequency characteristics of the video channel, the degree of reproduction is mainly determined by the phase of the chrominance signal and the luminance signal of the three primary colors of red (R), green (G), and blue (B) in the monitor. Decided. Since what the monitor observes is usually a static image, the requirements for the color reproduction of the monitor are higher than that of the TV. Therefore, the video channel of the professional monitor should have the brightness, chroma processing and R, G, B processing Precise compensation circuit and delay circuit to ensure the phase synchronization of bright/color signal and R, G, B signal.




The color of LCD monitors has always attracted attention. Many manufacturers have proposed the two standards of 16.2M and 16.7M. These two standards can intuitively reflect the color reproduction ability of LCD monitors. If the color requirements of the LCD monitor are stricter, a product with 16.7M is the best choice.




Overall stability




Monitor




When the monitor constitutes a closed-circuit monitoring system, it usually needs to be continuously powered on 24 hours a day, 365 days a year (while TV sets usually only work for a few hours a day), and the application environment of some monitors may be harsh, which requires The reliability and stability of the monitor is higher. Compared with TV sets, in terms of design, the monitor’s current, power consumption, temperature, resistance to electrical interference, electrical shock capability and margin, and mean time between failures are much greater than TV sets. At the same time, the monitor must Use a fully shielded metal shell to ensure electromagnetic compatibility and interference performance; in the selection of components, the withstand voltage, current, temperature, humidity and other characteristics of the components used by the monitor are higher than those used by the TV; In the process of installation and debugging, especially the components and the aging of the whole machine, the requirements of the monitor are also higher. When the TV is manufactured, the whole machine is usually energized for about 8 hours at room temperature on the assembly line. Aging needs to be energized and aged for more than 24 hours on the aging assembly line in a closed environment with high temperature and high humidity to ensure the stability of the whole machine.




From the above analysis, it can be seen that if a TV is used as the terminal monitor of the monitoring system, in addition to the fuzzy image (lower definition and poor color reproduction), the components used in the TV are not suitable for Requirements for intermittent continuous use. If forcibly use the TV as a monitor. In the slightest, it is prone to malfunction, and in the severe case, it may cause accidents due to the high operating temperature of the TV.