I was curious about the difference between Han's technology, and the iPhone's. In Han's words, his device is pressure based: http://www.youtube.com/watch?v=DZv1nBM8zsI (he also believes that the scale of the devices puts them into completely different categories.) I read up a little on the differences between pressure and capacitive devices, and one that stands out is that capacitive surfaces can emit more light, because less layers are required beneath the glass.

(Edit: I meant to post this as a reply to the grandparent comment, not the parent post about FingerWorks. Whoops.)