When you go to tap something on a touchscreen, you immediately lose sight of that area of the screen. It's usually not a big deal, but it can be a mild annoyance during games or text selection. Touchscreens aren't going away any time soon, so how do we solve this problem? Well, a group of researchers at the National Taiwan University have developed a solution, and they call it NailDisplay -- an OLED display that is mounted to your thumbnail.