Conclusion: The Dell U2312HM was pretty much everything we have come to expect from a Dell UltraSharp screen. It was pleasing to see Dell have stuck with an e-IPS panel and the decent feature and function set of the older model (U2311H) has been retained. The major technology change here is the move away from CCFL and towards a W-LED backlighting unit. In practical terms this only really offers the end user a slightly thinner profile and a slightly lower power consumption compared with the older screen. There are environmental advantages as well and it's a big trend at the moment so you can see why its been done with this model and others in their range.
From a performance point of view I was impressed in a couple of areas particularly. The input lag was incredibly low and basically this screen had no lag at all. Panel uniformity from our retail stock sample was also very good which was a positive sign considering there have been mixed reports and issues in the past with lower cost e-IPS screens. Let's hope other experiences are the same. Default colour setup was good as well, and responsiveness was very good, making it one of the faster 23" IPS models we have tested for sure. On the other hand I was a little disappointed by the quite low contrast ratio of 710:1 once calibrated. This was moderate for an IPS panel and not what we had hoped for considering what we had seen on other recent IPS screens, including the 24" U2412M.