The Lumia 920's screen packs a lot of new technology from Nokia; they even wrote their own white paper on what's going on behind that sliver of curved glass:
http://i.nokia.com/blob/view/-/1824216/data/2/-/PuremotionHD.pdf
http://i.nokia.com/blob/view/-/1824216/data/2/-/PuremotionHD.pdf