Dynamic Contrast Ratio is more or less marketing hype. I actually do not like dynamic contrast and I switch it off.
Basically the monitor adjusts the brightness and contrast of the monitor based on what is being displayed. Bright scenes dynamically decreases brightness and contrast while dark scenes dynamically increase brightness and contrast (both within a certain range). I find this very annoying which is why I switch off dynamic contrast and rely solely on static contrast ratio (typically 1000:1) which is the true measure of contrast on a monitor.
hmm i thought it was just the opposite, so bright scenes would be even brighter and dark scenes darker, thus getting higher ratio between the brightest and darkest possible state...
but yes, highly annoying and utterly useless nevertheless
both are led backlit...