Contrast Ratio static and dynamic


When we speak of monitors, screens, televisions, … We tend to refer to his as a contrast ratio of the technical specifications. One can assume that as this is bigger contrast ratio provide better image quality, but what is the contrast ratio? And what’s more, why are there so many differences between different models?
We began by explaining the concept of contrast ratio, which is the ratio between the luminosity produced by the color brighter and produced by the less brilliant, ie the brightness of the white divided between the luminosity of the color black cast on the screen.

This implies that as bigger the difference between the brightness of both the better the image quality. There is no point in the target to be very bright if it is black, as they do not get a good quality in dark scenes. The same is true in reverse.

But since we are talking about moving images also enters into the equation the variable time, which gives us two measures other than the contrast ratio: the ratio contrast static and dynamic contrast ratio.

The contrast ratio is static, basically what we have explained, the division of luminosity at a given time. Instead, the dynamic contrast ratio takes into consideration the time and is calculated as the ratio luminosities at different points in time.

It was very clear, right? Let’s take an example. If a monitor displays a static image with half of the screen in white and half black in color, the division of the luminosities of the two sides will be the contrast ratio static.

But current technology allows varying the brightness of the screen in different scenes, so if we are in a dark scene is possible reducing brightness, while we can increase if the scene is very clear. This means that the range of luminosities is bigger but only at different times, which makes it possible to calculate the dynamic contrast ratio.


Therefore, we should not be confused with each other when comparing different models. Often manufacturers offer us only the dynamic, because it is higher, and we know that in this world of consumer electronics large numbers always win, but we must not be misled.

Today it is normal to find static contrast ratios between 1000:1 and 5000:1 (some even 10000:1) in monitors and televisions for the home, while in contrast dynamic enter until 25000:1 or more, which, I repeat not to be confused when choosing among different models.

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