CAPACITIVE TOUCH SCREEN SENSING AND ELECTRIC FIELD SENSING FOR MOBILE DEVICES AND OTHER DEVICES

摘要

A system includes a touch screen having multiple electrodes. The system also includes a processing unit configured to use the electrodes to (i) detect an object contacting the touch screen or within a first distance from the touch screen in a first mode and (ii) detect the object within a second distance from the touch screen in a second mode. The second distance is larger than the fist distance. The processing unit can be configured to use the multiple electrodes in the first mode to perform capacitive touch screen sensing. The processing unit can also be configured to use the multiple electrodes in the second mode to perform electric field sensing.