Accessories such as control ICs, filters, and orientation films used in LCD manufacturing are related to the contrast of the panel. For the average user, a contrast ratio of 350:1 is sufficient, but in the professional field, such contrast does not satisfy the user. Demand. Compared to CRT monitors that easily achieve a contrast ratio of 500:1 or higher, only high-end LCD monitors can achieve this level. Samsung, Asus, LG and other first-line brands in the market today can achieve a 1000:1 contrast ratio, but because the contrast is difficult to measure accurately through the instrument, it is still necessary to look at it yourself.
LCD is a kind of substance between solid and liquid. It can't emit light by itself. It needs extra light source. Therefore, the number of lamps is related to the brightness of the liquid crystal display. The earliest liquid crystal display has only two lamps, the lowest is four lights, and the high-end is six lights. The four-lamp design is divided into three types: one is that there is one tube on each of the four sides, but the disadvantage is that there will be black shadows in the middle. The solution is to arrange the four tubes from top to bottom. The last type is the "U" type of display, which is actually two lamps produced by two lamps in disguise. The six-tube design actually uses three lamps. The manufacturer bends the three tubes into a "U" shape and then places them in parallel to achieve the effect of six lamps.
The viewing angle of the LCD is a headache. When the backlight passes through the polarizer, the liquid crystal, and the alignment layer, the output light is directional. That is to say, most of the light is emitted vertically from the screen, so when you look at the LCD monitor from a large angle, you can't see the original color, or even see all white or all black.
(1) Since the CRT display controls the electron beam by the electromagnetic field generated by the deflection yoke, since the electron beam cannot be absolutely positioned on the screen, the CRT display tends to have different degrees of geometric distortion and linear distortion. The LCD does not have any geometric distortion or linear distortion due to its principle problem, which is also a big advantage.
(2) Compared with the traditional CRT, the liquid crystal also performs well in environmental protection. This is because there is no high-voltage component like the CRT inside the LCD, so it does not have the x-ray exceeding the standard caused by the high voltage, so the radiation The indicators are generally lower than the CRT.
(3) The biggest advantage of LCD compared with traditional CRT is power consumption and volume. For traditional 17-inch CRT, its power consumption is almost 80W or more, while the power consumption of 17-inch LCD is mostly above 40W. In this way, LCD can be said to have obvious advantages in terms of energy saving.