If you've heard anything about the new iPhone 4, you've probably heard all about the fact that it can now (finally!) multitask - that is, run more than one app at a time -as well as store apps in folders, show a desktop wallpaper, all stuff that computers have been able to do for decades. One of the truly innovative components of the iPhone 4, however, may or may not have graced your synapses as of yet.
The screen on the iPhone 4, dubbed the "retina display" by Apple brass, is the highest resolution display ever mass-produced on a phone. This doesn't mean that it has the most pixels of any display ever made (even for a phone), however it does mean that the screen has the most pixels per square inch of any other portable consumer display in history (Apple).
