The highest contrast ratio of the AOC P2460 is 50000000:1. That's over two times the contrast ratio of a 20000000:1 flatpanel monitor, which is the most common contrast ratio. Across all PC monitors that came out more than two years ago the contrast ratio ranges from Mega Contrast to 100000000:1.
There are a number of other LCD screens that have a 50000000:1 dynamic contrast ratio currently available that you might want to look at including the VX2263 (£114.25), or the VX2363 (£126.70) both from Viewsonic or the AOC E2462 which has a better Rating.
PC displays with a higher contrast ratio that might also be worth considering include the VX238 (£134.53) (80000000:1), or the MX239H (£166.37) (80000000:1) both from Asus or the AOC G2460 (£189.56) (80000000:1) which also has a higher rating.