The highest contrast ratio of the Acer S231HL is 100000000:1. That's over five times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1.
A 100000000:1 dynamic contrast ratio is in fact the best contrast ratio amongst all medium monitors that have been available for more than two years.
The worst contrast ratio amongst similar types of LCD screen is Mega Contrast.
We compared this flatpanel monitor to all the other PC screens that have a 100000000:1 dynamic contrast ratio and we think the V236HL ($86.99), the B236HL ($457.13), and the B243 ($428.92) all from Acer which has a better Rating is also worth considering.