The difference between LCD monitor and CRT monitor

The difference between LCD monitor and CRT monitor

Color monitors using cathode ray ray tubes (CRTs) and color monitors using liquid crystal displays (LCDs) are distinguished by the principle of image reproduction. The former uses magnetic deflection drives to implement line-field scanning (also called analog driving). Mode), while the latter uses a dot-matrix drive (also called a digital drive). Therefore, the former often uses television lines to define its sharpness, while the latter defines its resolution by the number of pixels.

The clarity 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. The CRT monitor has the advantages of low cost, high brightness, wide viewing angle, and long service life, while the LCD monitor has the advantages of small size (flat plate shape), light weight, no flashing, and no radiation of the image, but the LCD monitor The main disadvantages are high manufacturing cost, narrow viewing angle (darkened image when viewed from the side, reversed color when viewed from the side), and short service life (usually the LCD screen brightness drops below 60% of normal brightness after 5,000 hours of burning, but The CRT has an average life expectancy of more than 30,000 hours) and other shortcomings. It should be affirmed that price, perspective, and service life are the three bottlenecks that affect the popularity of LCD monitors. Of course, LCD is one of the most mature leading-edge products of flat panel display devices, and it has been increasingly concerned by manufacturers at home and abroad, and its technology is continuously improving.

At present, the horizontal viewing angle of a new thin film product (TFT) process using an in-plane switching technology can reach 160°, and the vertical viewing angle can reach 140°; at the same time, the price of LCD screens will gradually spread with the products. And the gradual increase in production and gradually decline; LCD's life will also be with LCD backlight and liquid crystal material technology continues to improve. Therefore, there is no doubt that after several years (perhaps 5 or 10 years later), LCD monitors are likely to replace CRT monitors as the mainstream of the monitor market.

As the technology matures, LCDs are gradually replacing the original CRT monitors with their unique advantages such as high brightness, high contrast, elegant appearance design, and environmental protection features. Compared with the CRT monitor, the LCD monitor has features such as power saving, low radiation, and space saving, which makes it impossible to match the low-cost CRT monitor. The market is rapidly shrinking, leaving only markets such as Central and South America and China. No matter what kind of screen content, LCD monitor can bring accurate and exciting screen effects, making it the best choice for video surveillance.