Chris Harrison from the Carnegie Mellon Uni in Pittsburg developed a touch display which can differentiate between different kind of touches: touch with nails, fingertip and finger joints, respectively. Additionally the display also recognizes pencils. This additional functionality can be used e.g. to activate the left and right mouse key and to open menus and sub menus.
A first prototype was already developed utilizing a Galaxy S3 which was extended by a small vibration sensor and an appropriate software which which contains the real intelligence. Harrison already founded an own company Qeexo which shall be the link to bring the research results to the market.