Here’s an interesting concept that’s really a play on something we’ve seen before. What if you took a small touchscreen about the size of the iPhone and added another with a folding hinge between the two? That’s the design idea behind the Plica concept. Need some basic information? Just look it up on one screen. Want to expand your viewable area? Unfold and tap, tap, tap.
The idea is interesting and would offer more display real estate when using an on-screen keyboard. Of course, mobile tech is all about compromises, so any manufacturer going this route would contend with device thickness issues. Tough call, but still interesting.