Samsung Mobile Phone Prototype With A Foldable OLED Display
In FPD 2008 samsung introduced a prototype of mobile phone, which had a foldable screen, it looks like a clamshell when closes, but when you open it you can enjoy big screen video.
Here is the video showing the samsung concept.
Amazing Technology 
That is what people waiting for, wide scree video experience on their mobile phones, and it seems samsung is going pretty fast in that way.
[Via:oled-info]
A better video about the smartphone prototype with two AMOLED displays tiled together seamless enabled by thin film encapsulation here:
http://www.oled-display.net/better-video-about-samsungs-folding-amoled-display-in-a-smartphone