Palette has a multitouch screen that extends to the surfaces at the top and bottom of the main display. In other words, the surfaces at the top and bottom of the phone are also mini touch screens.
The device then has three independent displays. The display of the top provides quick access to the Internet, including email and social networks while the lower one shows the basic tasks and menus. Kunihiko Nakata explains that these tactile surfaces at the ends of the device releases a little more the main display. Thus, the touch controls do not clutter the screen. For convenience, the two surfaces at the top and bottom are not flat but slightly tilted.
Palette is currently a concept. It is unclear whether phone manufacturers will be interested in any case the idea is pretty good and obviously practice.