The highest contrast ratio of the LF19TOWHBFM is 1000:1. That's 100% less contrast ratio than a 20000000:1 LCD screen, which is the most common contrast ratio. The contrast ratio of all PC displays of this age and spec ranges from Mega Contrast (worst) to 100000000:1 (best).
There are a number of alternative PC displays that have a 1000:1 dynamic contrast ratio currently available which you might also want to look at including cheaper flatpanel monitors such as the Samsung TC241W (£433.42).
If you are looking for an LCD screen with a higher contrast ratio then you might want to look at the NEC MultiSync EA244 (£306.00) (25000:1), or the Viewsonic VP2772 (£487.08) (2000000:1) which also has a higher Rating.