One of the most obvious and important physical changes rumored for the new iPhone is a bigger, 4-inch display with a taller, 16:9 aspect ratio that uses thinner in-cell technology. While the 2010 iPhone 4 saw Apple double the pixel density of the iPhone display from 320x480 to 640x960, the physical size and 3:2 aspect ratio stayed the same. If the iPhone 5 is introduced on September 12 with a bigger 640x1136 screen, as we believe it will, for the first time that Apple will have changed the physical size and aspect ratio of an iPhone display.