1. Contrast
The control ICs, filters and directional films used in the manufacture of LCD screens are related to the contrast ratio of the panel. For ordinary users, a contrast ratio of 350:1 is sufficient, but in the professional field, such contrast ratios are not sufficient. meet the needs of users. Compared with CRT monitors, which can easily achieve a contrast ratio of 500:1 or even higher, only high-end LCD monitors can achieve such a level. The LCD monitors of first-tier brands such as Samsung, ASUS, and LG in the market can reach the level of 1000:1 contrast ratio. However, because the contrast ratio is difficult to accurately measure by instruments, you have to see it yourself when choosing.
Contrast is very important. It can be said that it is a more important indicator for selecting liquid crystals than bright spots. When you know that your customers buy liquid crystals for entertainment and watching video discs, you can emphasize that contrast is more important than no dead pixels. We are looking at When streaming media, the brightness of the general film source is not large, but to see the light and dark contrast of the character scene, and the texture change from gray to black, it depends on the level of contrast. In the 256-level grayscale test in the test software When you look up, you can see more small gray grids clearly, which means that the contrast is good!
2. Brightness
The LCD screen is a substance between solid state and liquid state. It cannot emit light by itself, and it needs an additional light source. Therefore, the number of lamps is related to the brightness of the liquid crystal display. The earliest liquid crystal displays only had two upper and lower lamps, the lowest of the popular type was four lamps, and the high-end ones were six lamps. The four-lamp design is divided into three placement forms: one is that there is one lamp 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 lamps horizontally from top to bottom. The last one is the "U" shape, which is actually two lamps produced by two lamps in disguise. The six-lamp design actually uses three lamps. The manufacturer bends the three lamps into a "U" shape and then places them in parallel to achieve the effect of six lamps.
Brightness is also a more important indicator. The brighter the LCD is, it will stand out from a row of LCD walls when viewed from a distance. The highlighting technology we often see in CRTs is to increase the current of the shadow tube. Bombard the phosphor to produce a brighter effect. Such technology is generally traded at the expense of image quality and the life of the display. All products using this technology are bright by default. Always press Press a button to play the game; press it again to turn it into a 5X brightness to watch a video disc. If you look closely, it will become blurred. To see the text, you have to return to the normal text mode honestly. This design is actually to let Don't use highlighting. The principle of LCD display brightness is different from that of CRT. They are realized by the brightness of the backlight tube behind the panel. Therefore, the lamp should be designed more, and the light will be uniform. But all high-brightness panels will have a fatal injury, and the screen will leak light. Light leakage means that under a completely black screen, the liquid crystal is not black, but white and gray. Therefore, a good LCD should not blindly emphasize the brightness, but should emphasize the contrast more.
