It's a H-IPS panel made by LG which is cheaper. Some monitor specific sites which I trust say (not presume) that it's H-IPS and they didn't fail me so far, by giving false informations. Even when a manufacture (like Samsung - for example) switched with a different type of panel, that information was available - regarding two type of panels for same model. It's true that so far we have 3 different informations if you check google (IPS,S-IPS and H-IPS), but the sites I trust say it's H-IPS (http://www.tftcentral.co.uk/ for example).
HP ZR22w - 8ms G2G 21.5" WS LG.Display H-IPS (LM215WF2)
HP ZR24w - 5ms G2G 24" WS LG.Display H-IPS
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