The highest contrast ratio of the Packard Bell Viseo 243D is 100000000:1. That's over five times the contrast ratio of the most common dynamic contrast ratio of 20000000:1.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio across all LCD screens of a comparable spec and age to the Viseo 243D.
A Mega Contrast dynamic contrast ratio is the worst contrast ratio across similar types of PC monitor.
There are a number of alternative PC displays that have a 100000000:1 dynamic contrast ratio currently available that you might want to consider including the G237HL (£101.98), or the V236HL (£124.74) both from Acer which has a better Rating; or the Acer V225HQL which is cheaper.