It is also common to market only the dynamic contrast ratio capability of a display (when it is better than its static contrast ratio), which should not be directly compared to the static contrast ratio. A plasma display with a static 5000:1 contrast ratio will show superior contrast to an LCD with 5000:1 dynamic and 1000:1 static contrast ratio when the input signal contains a full range of brightnesses from 0 to 100% simultaneously.
One reviewer is giving up:
There was a time when I used to lambast the meaninglessness of dynamic contrast ratio figures quoted in the latest TVs and monitors, but now I just give up...
Samsung has launched the 'XL2370', a 23in 16:9 LED backlit monitor which it claims has a 5,000,000:1 dynamic contrast ratio. Let me say that again: 5,000,000:1. To put this in perspective, the eighth generation Pioneer Kuro - a set which revolutionised the HDTV landscape (as is still only bettered by its successor) - has a 16,000:1 contrast ratio. Sigh.