The Register found a video of a new concept phone from Samsung that features a large (5"?) foldable OLED display:
Initially, the phone - which it’s thought was recently seen on a Samsung stand at a display tech trade show in Japan - looks more like a portable media player because of its large - 5in or so – display.
But suddenly the phone automatically folds itself in half, revealing a secondary – yet much smaller – screen on the opposite side. After a few seconds the device then opens itself up again.
When closed, a Samsung emblem can clearly be seen underneath the smaller screen. A menu of icons can be seen on the smaller screen, suggesting the front panel is touch-sensitive. What appear to be the usual call make and break buttons are also built into the unit’s front.