Researchers create pixels eight times smaller than the Retina Display
Researchers at the University of Michigan have created a display with nanometer-thin sheets of metal (called nanoresonators) that use slits to create pixels eight times smaller than the pixels currently on the iPhone 4. To show off their work, the University of Michigan researchers created their school's logo on a display only 9 microns tall (a strand of human hair is about 100 microns wide).
Crazy. You have to wonder what an iPhone-sized display would look like with a resolution like that (or if we'd even tell the difference, given that our eyes have a limit on the amount of detail they can discern). Obviously, such display would probably cost a lot more than the iPhone 4 actually does.