What is the dynamic contrast?

ByBernadina Kempton 2020-01-04 3440

Dynamic contrast refers to the contrast value measured by LCD in some specific cases, such as testing each area of the screen one by one and taking the contrast value of the area with the largest contrast as the contrast parameter of the product. Different manufacturers may have different methods of measuring dynamic contrast, but its essence remains the same. Dynamic contrast and real contrast are two different concepts. Generally speaking, the dynamic contrast of the same LCD is 5 times of the actual contrast. Therefore, dynamic contrast is nothing more than a digital game played by manufacturers and has no practical significance.

To put it simply, the dynamic contrast is the same as the full on / off contrast, which is also the ratio of the brightness displayed by the display when it receives the all-white signal to the brightness of the all-black signal display. Unlike full on / off contrast, the display adjusts the brightness of the backlight tube so that the brightness of the all-white signal is higher, and the brightness of the all-black signal display is lower, and then to a larger value.

For example, if the brightness of an all-white picture is 200cd/m2, if the brightness of the all-black picture is 0.1cd/m2, its dynamic contrast will be 2000 0.1cd/m2; if the brightness of the all-black picture is reduced to 0.01cdUniqm2, its dynamic contrast will reach 20000 . If the manufacturer turns off the backlight completely for the all-black screen in the control circuit, then the brightness is 0cdmax m2, and the dynamic contrast will be & amp;ldquo; infinity "! For example, Asustek's newly released MS series LED LCD refreshes the dynamic contrast of the panel to a height of 10 million: 1. Moreover, according to Asustek's technical engineers, 10 million: 1 will become the new standard for dynamic contrast of LED liquid crystal displays.

Through the above analysis, we can find that the dynamic contrast is mainly to ensure the brightness of the bright scene, and dark enough when the scene is dark. Therefore, dynamic contrast has obvious practical significance for those applications that need to switch frequently between bright scenes and dark scenes. For computer applications, text processing, surfing the Internet, office, and programming all have basically no great changes in light and shade; the brightness of most games is within a fixed range, and the switching between bright and dim pictures is not at all, but it is rare. All in all, only film and television need to switch between light and dark scenes frequently in computer applications, so only film and television is the application with the greatest dynamic contrast.

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