A user input system (40) in which an output from a cross-capacitance object sensing system (30) (also known as an electric field object sensing s system) is combined with an output from a touchscreen device (15). An output from the user input system (40) may comprise position information derived from...http://www.google.es/patents/US20080266271?utm_source=gb-gplus-sharePatente US20080266271 - Input System
