The Gateway KX2153 has a maximum contrast ratio of 100000000:1. That's over five times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1.
This PC monitor's contrast ratio (100000000:1) is actually the best contrast ratio across all PC displays of a comparable age and spec to the KX2153.
The worst contrast ratio across comparable types of PC monitor is Mega Contrast.
There are a number of other PC displays that have a 100000000:1 dynamic contrast ratio currently available which you might want to consider including because of it's better review score, the H276HL, or the 276HUL both from Acer.