A smartwatch prototype LumiWatch made by Carnegie Mellon university can project image on the arm of user that can be swapped and tapped and turns user’s arm in to a touch screen. It has image projection of 5 times of a smartwatch screen.
LumiWatch has 15-lumen projector powered by quad-core Spanpdragon CPU with 768 MB of RAM and has 740mAH battery. It supports Wi-Fi and bluetooth connectivity and running on Android 5.1. The watch will cost around $600 and will have dimension smilar to Apple watch series 3.