The highest contrast ratio of the LG 19EN33 is 50000000:1. That's over two times the contrast ratio of a 20000000:1 PC display, which is the most common contrast ratio. The contrast ratio of all LCD screens that were launched more than two years ago ranges from Mega Contrast (worst) to 100000000:1 (best).
It may also be worth also looking at one of the other LCD screens that have a 50000000:1 dynamic contrast ratio currently available including the VS208 (£97.04), or the VE198 (£64.98) both from Asus or the Hanns.G HP195 (£75.87) 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 VK207 (£124.99) (80000000:1), or the VS207 (£79.32) (80000000:1) both from Asus or the Hanns.G HX194 (£92.96) (80000000:1) which also has a higher rating.