The Edge10 ET190a has a maximum contrast ratio of 10000:1. That's 100% less contrast ratio than a 20000000:1 flatpanel monitor, which is the most frequently found contrast ratio. Across all PC displays that came out around the same time as the ET190a the best contrast ratio is 100000000:1 and the worst is Mega Contrast.
Other flatpanel monitors that have a 10000:1 dynamic contrast ratio currently available that you might want to consider include the ES195c (£78.72), the ET185a, or the ES220D Slim (£78.55) all from Edge10 which is cheaper.
If the contrast ratio of this small monitor is not high enough for you then you might want to consider the 17S1AB (25000:1), or the 191EL1SB (1000000:1) both from Philips or the HP x20LED (1000000:1).