Dynamic contrast is the ratio of black to white, that is, the gradual change from black to white. The greater the ratio, the more layers from black to white, and the richer the color performance. Contrast plays an important role in visual effect. Generally speaking, the greater the contrast, the clearer and more striking the image, the brighter and more gorgeous the color. And the contrast is small, which will make the whole picture gloomy.

60000: 1 refers to the ratio of all-white picture to all-black picture. For example, a display with an all-white picture brightness of 200cd/m2, if the all-black picture brightness is 0. 1cd/m2, its dynamic contrast is 2000: 1.

High contrast is very helpful for image clarity, detail expression and gray scale expression. High-contrast products have advantages in black-and-white contrast, clarity and completeness in some aspects such as text display, CAD display and black-and-white photo display. Relatively speaking, at the color level, the influence of high contrast on the image is not obvious.

Contrast has a great influence on the display effect of dynamic video. Because the faster the transition between light and dark in dynamic images and the higher the contrast, the easier it is for human eyes to distinguish such a transition process. High-contrast products have more obvious advantages in detail, clarity and high-speed moving objects in some dark scenes.

Extended data:

In fact, the introduction of dynamic contrast is to make up for the deficiency of liquid crystal display mechanism, because both CRT and plasma have the display ability of local peak brightness, and DLP devices also have high real contrast. If liquid crystals want to achieve the same peak brightness, they have to improve the backlight brightness, so as to display bright scenes with better performance.

However, after the backlight brightness is improved, it is impossible to ensure enough darkness in the black scene. Dynamic backlight control solves this problem well. When the scene is black, reduce the backlight brightness appropriately to make the black scene black enough. But it still can't solve the contradiction between the dark area and the bright area on the same picture, and it can't fully take care of the bright lights at night and the shadows in the sun.

Therefore, the introduction of dynamic backlight system and the identification of dynamic contrast are really helpful to improve the display effect of LCD. But there is always a limit to everything. Things that are too dark are not clear to the human eye. If the brightness of the dark scene is greatly reduced simply to improve the number of dynamic contrast, it is easy to make the picture black and unrecognizable by human eyes.

Baidu Encyclopedia-Dynamic Comparison