The LS24C570 has a maximum contrast ratio of 1000:1. That's 100% less contrast ratio than the most frequently found dynamic contrast ratio of 20000000:1. The worst contrast ratio of all PC displays of a comparable type and age to the LS24C570 is Mega Contrast and the best is 100000000:1.
Other PC monitors that have a 1000:1 dynamic contrast ratio currently available that you might want to consider include cheaper PC displays such as the Samsung LS23C65 (£170.70).
If the contrast ratio of this PC screen is too low for you then you might want to consider the Samsung C24A650X (3000:1 and cheaper); or the Benq BL2410 (£172.11) (3000:1 and higher rated), or the iiyama X2485WS (£220.36) (3000:1 and higher rated).