There is not a ton of information about the KDDI R&D Laboratories Inc. “Portable Viewer System” but what has been revealed is exciting. It’s A4 and can wirelessly receive images from devices like a mobile phone. The screen can display up to 4,096 colors and refresh in 12 seconds. I’m not sure whether e-paper means it’s a derivative of eink or some other screen technology.
Strangely the device is nearly completely controlled by the handset. It doesn’t seem a very practical interface, but it is a prototype.