The Asus VN289 has a maximum contrast ratio of 80000000:1. That's over four times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1. The contrast ratio of all LCD screens of this age and type ranges from Mega Contrast to 100000000:1.
There are a number of other PC screens that have an 80000000:1 dynamic contrast ratio currently available which you might also want to consider including the AOC U2868 (£349.24), the Hanns.G HS271 (£139.98), or the Hannspree HS271HPB (£153.97) which has a better Rating.
If the contrast ratio of this PC screen is too low for you then you might want to consider the B236HL (£150.06) (100000000:1), or the B243 (100000000:1) both from Acer or the Packard Bell Viseo 273Db (100000000:1) which also has a higher Rating.