Contrast is a measure of the different brightness levels between the brightest white and the darkest black in an image. The larger the difference range, the greater the contrast. The smaller the difference range, the smaller the contrast. The good contrast ratio of 120: 1 can easily display vivid and rich colors. When the contrast ratio is as high as 300: 1, all levels of colors can be supported. However, contrast and brightness face the same dilemma. At present, there is no effective and fair standard to measure contrast, so the best way to identify it depends on the eyes of users.

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The influence of contrast on visual effect is very critical. 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. 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.

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