What are the two common technical parameters of LCD displays?

1. Contrast

The control IC used in the manufacture of LCD screens、Accessories such as filters and orientation films,It is related to the contrast of the panel,For general users, A contrast ratio of 350:1 is enough,However, such contrast in the professional field cannot meet the needs of users. Compared with CRT monitors easily reaching 500:1 or even higher contrast ratio, Only high-end LCD monitors can achieve this level. The LCD monitors of first-tier brands such as Samsung, Asus, LG, etc. on the market can reach the level of 1000:1 contrast ratio. But because the contrast is difficult to accurately measure with the instrument,So when you choose, you still have to see it yourself.

  Contrast is very important, It can be said that the selection of an indicator of liquid crystal is more important than the bright spot, When you learn that your customers buy LCDs for entertainment and watching movies, You can emphasize that contrast is more important than no dead pixels, When we are watching streaming,Generally, the brightness of the film source is not large,But to see the contrast of light and dark in the character scene, Hair texture changes from gray to black, It depends on the contrast level. In the 256-level gray scale test in the test software, more small gray grids can be seen clearly when looking up, that is, the contrast is good!

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2.Brightness

LCD liquid crystal screen is a substance between solid and liquid.Can’t emit light by itself,An additional light source is needed.therefore,The number of lamps is related to the brightness of the LCD. The earliest liquid crystal displays had only two upper and lower lamps,The lowest of the popular type is four lights. The high-end is six lights. The four-lamp design is divided into three types of placement: One is a tube on each of the four sides, But the disadvantage is that there will be dark shadows in the middle, The solution is to arrange the four light tubes horizontally from top to bottom. The last one is the “U”-shaped display, In fact, they are two tubes produced by two lamps in disguise. The six-lamp design actually uses three lamps, The manufacturer bent all three light tubes into a “U” shape, and then placed them in To achieve the effect of six tubes.

  Brightness is also a more important indicator, The brighter the LCD shows people far away,Stand out from a row of LCD walls,The highlight technology we often see in CRTs is to increase the current of the shadow mask tube.Bombard the phosphor, Produces a brighter effect,Such technology, Generally at the expense of image quality, In exchange for the life of the monitor, All products adopting this kind of technology are general bright by default, Always press a button to execute, Click 3X to play the game; Press again to change to 5X brightness to watch the DVD, When I look closely, it becomes blurred. To see the text, you have to return to the normal text mode. This design actually prevents everyone from using highlighting. The principle of LCD display brightness is different from CRT. They are achieved by the brightness of the backlight tube behind the panel. So there are a lot of lamp designs, The light will be uniform. But all the bright panels will have a fatal injury,  The screen will leak light, Light leakage refers to under the completely black screen, The LCD is not black, It is whitish and gray. Therefore, a good LCD should not blindly emphasize brightness, Instead, emphasize the contrast more.

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Post time: Jan-23-2021