What are the two common technical parameters of the LCD display?

- Nov 02, 2018 -

What are the two common technical parameters of the LCD display?

First, the contrast

The control IC, filter and orientation film and other accessories used in the manufacture of LCD screens 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 cannot be achieved. Meet the needs of users. 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 since the contrast is difficult to measure accurately through the instrument, it is still necessary to look at it yourself.

Contrast is very important. It can be said that it is a more important indicator to select LCD. When you know that your customer buys LCD for entertainment, you can emphasize that contrast is more important than no bad point. We are watching When streaming media, the brightness of the film source is not large, but to see the contrast between the scenes of the characters, the gray to black texture changes, it depends on the contrast level, in the 256-level gray test in the test software. In the flat view, you can see more small gray grids, that is, the contrast is good!

Second, the brightness

The LCD screen is a kind of substance between the solid and the liquid. 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 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 in a flat manner. The last type is the "U" type of display, which is actually two lamps produced by the 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 tubes.

Brightness is also an important indicator. The brighter the LCD gives a far-sighted look, it stands out from a row of LCD walls. The highlight technology we often see in CRT is to increase the current of the shadow tube. Bombardment of phosphors, producing a brighter effect, such technology is generally in exchange for sacrificing image quality, and the life of the display, all products using such technology are bright by default, always press You can use the button to play the game. Click on the 3X to play the game. Press it to turn it into 5X to watch the video. If you look at it, you will change it. If you want to see the text, you have to go back to the normal text mode. This design is actually Don't use highlights. 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 even. But all the bright panels will have a fatal injury, the screen will leak light, light leakage means that under the black screen, the LCD is not black, but white and gray. Therefore, a good LCD does not emphasize brightness, but emphasizes contrast.

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