One of the main features of the iPhone 4 handset is its innovative Retina Display, shown in action at WWDC 2010. It’s based on the IPS technology and uses much smaller pixels than the average screen, fact proved by the DSLR camera photo taken recently and published on 9to5mac. Here they are:
The Retina Display relies on a backlit LCD, that features a pixel density of 326 pixels per inch, which makes the iPhone 4 the smartphone with the highest resolution ever: 960 x 640 pixels. For such performances to be reached, the Apple engineers created incredibly small pixels, only 78 micrometers across, that can be distinguished by the human eye.