The HP Compaq LA2405 has a maximum contrast ratio of 3000:1. That's 100% less contrast ratio than a 20000000:1 PC screen, which is the most frequently found contrast ratio. Across all LCD screens that have been on the market for around the same time as the Compaq LA2405 the worst contrast ratio is Mega Contrast and the best is 100000000:1.
We compared all the other LCD screens that have a 3000:1 dynamic contrast ratio to this PC display and we think a cheaper PC screen such as the iiyama X2485WS or you might consider a higher scoring PC screen such as the Benq BL2410 are also worth considering.
If you want a PC screen with a higher contrast ratio then you might want to look at the EA224WMi ($172.99) (25000:1), or the MultiSync EA274 ($749.00) (25000:1) both from NEC which is also higher rated.