The Acer 222HQL has a maximum contrast ratio of 100000000:1. That's over five times the contrast ratio of a 20000000:1 PC monitor, which is the most common contrast ratio.
This PC monitor's contrast ratio (100000000:1) is actually the best contrast ratio amongst all flatpanel monitors of a similar age and type to the 222HQL.
The worst contrast ratio across similar types of PC monitor is Mega Contrast.
It may also be worth also looking at one of the other PC screens that have a 100000000:1 dynamic contrast ratio currently available including because of it's better review score, the V226 ($125.99), or the 226HQ both from Acer.