The Acer 226WL has a maximum contrast ratio of 100000000:1. That's over five times the contrast ratio of a 20000000:1 PC display, which is the most frequently found contrast ratio.
A 100000000:1 dynamic contrast ratio is in fact the best contrast ratio amongst all PC displays of a comparable age and spec to the 226WL.
A Mega Contrast dynamic contrast ratio is the worst contrast ratio amongst comparable types of LCD screen.
It may also be worth considering one of the alternative PC monitors that have a 100000000:1 dynamic contrast ratio currently available including the Acer B236HL ($457.13) which has a better Rating; or the Acer V236HL ($86.99) which is cheaper.