Orustech Japan has teamed with Casio and Toppan Printing to develop the world’s smallest 1080p display. It measures 4.8 inches diagonally and has a native resolution of 1920x1080 at an extremely high density of 458 pixels-per-inch (ppi). This is a much more densely packed display than the iPhone 4’s vaunted 3.5-inch Retina display, which has a 960x640 resolution at 326ppi.
In order to deliver a display of this level of resolution in such a small area, Orustech has developed a new display technology it refers to as Hyper Amorphous Silicon TFT, or HAST. It also has a wide viewing angle of 160-degrees and has support for 16 million colors.
Source: Electronista