The highest contrast ratio of the Viewsonic VX2770 is 30000000:1. That's 50% more contrast ratio than the most frequently found dynamic contrast ratio of 20000000:1. The best contrast ratio of all flatpanel monitors that have been around for more than two years is 100000000:1 and the worst is Mega Contrast.
Other PC screens that have a 30000000:1 dynamic contrast ratio currently available which you might also want to look at include because of it's better review score, the Hannspree HL229DPB, or the V7 L27000WHS-9E.
If the contrast ratio of this LCD screen is not high enough for you then you might also want to consider the HE225DPB (40000000:1), or the HE247DPB (40000000:1) both from Hanns.G which is also higher rated.