The Acer G247HL has a maximum contrast ratio of 100000000:1. That's over twenty times the contrast ratio of the most frequently found dynamic contrast ratio of 5000000:1.
This PC display's contrast ratio (100000000:1) is in fact the best contrast ratio across all comparable spec flatpanel monitors that came out more than a year ago.
Across comparable types of PC display the worst contrast ratio is Mega Contrast.
There are a number of alternative PC screens that have a 100000000:1 dynamic contrast ratio currently available that you might want to consider including the Acer K242HQL (£108.72) which has a better Rating; or the Acer 12HQLB (£88.74) which is cheaper.