Motorola Rizr rollable smartphone concept

The Motorola Rizr rollable concept smartphone features a rollable display that extends when you need more display real estate.

So for example, when you want to watch a video, the screen will roll out and expand to provide a wider screen for video watching. Likewise, if you start drafting a Gmail, the phone will extend its display vertically so you'll have more display real estate available when using your keyboard.