Comment by goosedragons

The ThinkPad R50p had a QXGA screen (2048x1536) option back in 2003. Granted Windows had zilch support for it which is probably why it died. Even the base model was a 1600x1200 screen. And there was plenty of phones with 200+ ppi before the iPhone 4. I think it has more to do with higher PPI screens getting cheaper and Apple could just get more supply first...