What is the typical contrast of a liquid crystal display?

The contrast of a liquid crystal display is actually the ratio of brightness, which is defined as: In a darkroom, the brightness under the white screen (brightest) divided by the brightness of the black screen (the darkest time). To be more precise, contrast is to subtract the white signal from the saturation of 100% and 0% and divide it by using lux (illuminance, i.e. lux, lumen per square metre) to measure the white value of 0% (0% of the white signal is actually black) and the resulting value. The contrast is the division value of the darkest and most white luminance units. So the brighter the white, the darker the black, the higher the contrast. Contrast is an important parameter of liquid crystal display, the higher the contrast is, the richer the color level can be displayed in the reasonable brightness value.

There are two types of contrast parameters that are marked on the leaflet by the manufacturer. One is a typical value, that is, the contrast in the same screen, the other is the maximum, the overall display in brightness is not necessarily the state of the maximum, the minimum brightness ratio of the contrast, such as a liquid crystal maximum contrast is 550:1, and the typical value is 500:1. Then the maximum value is not a reference, the typical value is the real contrast, the largest contrast is actually the number of players to play the game.

In addition, some manufacturers have labeled the contrast is called "dynamic contrast." Dynamic contrast refers to the contrast values measured by a liquid crystal display under certain conditions, such as each area of the screen, and the contrast value of the region with the largest contrast as the contrast parameter of the product. The measurement methods of dynamic contrast of different manufacturers may vary, but their nature is same. Dynamic contrast and real contrast is two different concepts, generally the same liquid crystal display dynamic contrast is 3-5 times the actual contrast degree. Therefore, dynamic contrast is just the number of players playing the game, and there is no practical significance.

At present, the contrast of the mainstream LCD is mostly concentrated in the level of 400:1 to 600:1, while the Canadian company Brightside introduced the LED backlight technology dr-37p ultra-high dynamic range of liquid crystal display is claimed to have 200,000:1 of the ultra-high contrast, It's a bit of a shock.