PhD candidates Ryan White and Bryan Gauntt of Penn State University sent Engadget some interesting comparison images of a Retina Display under the microscope together with a 3G screen.
“According to their measurements, the iPhone 3G’s pixels measure 13 x 40 microns, while the iPhone 4’s measure 6.5 x 20 microns, which adds up to exactly four times as many pixels.”
We know it’s impressive, but if you want scientific confirmation - just check out the images after the break.