The Acer H277H 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 flatpanel monitor's contrast ratio (100000000:1) is in fact the best contrast ratio across all PC displays of this age and spec.
Across similar types of flatpanel monitor the worst contrast ratio is Mega Contrast.
There are a number of alternative PC monitors that have a 100000000:1 dynamic contrast ratio currently available that you might want to look at including cheaper flatpanel monitors such as the G246HY ($98.99), or the K242HQK both from Acer.