The Acer 226HQ has a maximum contrast ratio of 100000000:1. That's over five times the contrast ratio of a 20000000:1 LCD screen, which is the most frequently found contrast ratio.
This PC screen's contrast ratio (100000000:1) is actually the best contrast ratio amongst all PC monitors of this type and age.
A Mega Contrast dynamic contrast ratio is the worst contrast ratio across similar types of PC screen.
There are a number of other PC monitors that have a 100000000:1 dynamic contrast ratio currently available which you might want to look at including the G246H ($98.99), or the V226 ($125.99) both from Acer which is cheaper.