The Acer G277H has a maximum contrast ratio of 100000000:1. That's over twenty times the contrast ratio of a 5000000:1 PC screen, which is the most common contrast ratio.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio across all comparable spec PC screens that came out around the same time as the G277H.
The worst contrast ratio amongst similar types of PC monitor is Mega Contrast.
Other PC screens that have a 100000000:1 dynamic contrast ratio currently available which you might want to look at include the Acer H277HU which has a better Rating.