The AOC E2276 has a maximum contrast ratio of 50000000:1. That's over ten times the contrast ratio of a 5000000:1 PC monitor, which is the most frequently found contrast ratio. The contrast ratio of all flatpanel monitors of a similar age and spec to the E2276 ranges from Mega Contrast to 100000000:1.
It may also be worth considering one of the other PC monitors that have a 50000000:1 dynamic contrast ratio currently available including because of it's better review score, the Viewsonic VX2263SMHL (£104.38), or the AOC E2476 (£104.99).
If the contrast ratio of this flatpanel monitor is not high enough for you then you might want to look at the Asus VX239H (£114.97) (80000000:1 and higher rated).