The Packard Bell Viseo 193DX has a maximum contrast ratio of 100000000:1. That's over five times the contrast ratio of a 20000000:1 LCD screen, which is the most frequently found contrast ratio.
This PC monitor's contrast ratio (100000000:1) is actually the best contrast ratio across all small monitors that have been around for a similar time to the Viseo 193DX.
Across similar types of PC monitor the worst contrast ratio is Mega Contrast.
Other LCD screens that have a 100000000:1 dynamic contrast ratio currently available which you might want to consider include the Acer 196L (£97.62) which has a better Rating; or the Acer 193HQLHb which is cheaper.