Technically, the AU Optronics "IPS" screen is not really IPS. [http://www.tftcentral.co.uk/articles/panel_technologies.htm]
We had a true IPS screen on a Lenovo x220 and also ordered the 1980x1020 Au Optronics 'FHD' (AHVA) screen on the Lenovo T440s. I could tell IMMEDIATELY that the latter...