The three major differences between TV sets and monitors

The three major differences between TV sets and monitors are the basic knowledge that everyone should understand. Everyone knows that in life, many people have a doubt after seeing the monitor. The long one is similar to the TV set. What is a monitor? Why are the two not interchangeable?

In fact, the monitor is simpler in function than the TV but in performance, it requires higher requirements than the TV. The main difference is reflected in the three "degrees".

The three major differences between TV and monitor are image clarity: since the traditional TV receiver 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 The 400 line requires a high image clarity of the monitor. Therefore, the professional monitor should have a bandwidth compensation and boost circuit on the channel circuit than the conventional TV set, so that the passband is wider and the image definition is higher.

The three major differences between TV sets and monitors are 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 red (R) and green (G) in the monitor. The blue (B) three primary colors are determined by the chrominance signal and the phase of the luminance signal. 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 three major differences between TV sets and monitors are 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 the application environment of some monitors may be harsh, which requires the reliability and stability of the monitor to be higher. 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, degree, 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.

What is the difference in performance between CRT monitors and LCD monitors? Will CRT monitors be replaced by LCD monitors? A color monitor using a cathode ray tube (CRT) and a color monitor using a liquid crystal display (LCD) differ in the principle of image reproduction. The former uses a magnetic deflection drive to implement a field scan method (also called an analog drive). The latter, while the latter uses a dot matrix drive (also known as digital drive). Thus the former often uses television lines to define its sharpness, while the latter defines its resolution by the number of pixels. The sharpness of a CRT monitor is mainly determined by the channel bandwidth of the monitor and the dot pitch and convergence error of the picture tube, while the latter is determined by the number of pixels of the LCD screen used. CRT monitors have the advantages of low price, high brightness, wide viewing angle and high service life, while LCD monitors have the advantages of small size (flat shape), light weight, no flickering and no radiation of images, but LCD monitors. The main disadvantages are high cost and narrow viewing angle (the image becomes dark when viewed from the side, the color drifts even if it appears), and the service life is short (usually the brightness of the LCD screen drops below 60% of normal brightness after 5000 hours of burning, but CRT The average life expectancy can reach 30,000 hours or more. It should be affirmed that price, viewing angle and service life are the three major bottlenecks affecting the popularity of LCD monitors. Of course, LCD, as one of the most mature front-end products of flat panel display devices, has been paid more and more attention by domestic and foreign manufacturers, and its technology is constantly improving. At present, the LCD screen of the new film body (TFT) process using in-plane switching technology has a horizontal viewing angle of 160° and a vertical viewing angle of 140°. At the same time, the price of the LCD screen will gradually increase with the product. And the gradual increase in output and gradually decline; LCD's service life will also increase with the continuous improvement of LCD backlight and liquid crystal material technology. So it is undoubted that after a few years (may be 5 or 10 years later) LCD monitors are entirely possible to replace CRT monitors as the mainstream product in the monitor market.

Through the above understanding, I believe that everyone has a certain understanding of the characteristics of the monitor and TV and performance, it will be very clear in the future.