Detection of intended key activation on a mobile device

Details Detection of intended key activation on a mobile device Detection of intended key activation on a mobile device

H - Electricity

04

W

H04W 88/02 (2009.01) H01H 13/705 (2006.01) G01R 27/26 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2720551

A method and device are provided for preventing unintended activation of one or more hard keys on a mobile device. A capacitive sensor senses a capacitance level at a location on the keyboard, to detect whether a hard key is being actuated by a human hand or human skin. If the sensed capacitance level exceeds a key activation capacitance threshold, a key circuit connection is identified as being associated with an intended hard key activation. If the measured capacitance level is within an uncertainty tolerance below the key activation capacitance threshold, a secondary capacitance level is measured at a non-keyboard location. The key circuit connection is identified as being associated with an intended hard key activation when the measured secondary capacitance level exceeds a key activation confirmation threshold. Additional secondary indicators can be obtained based on size and shape capacitance pattern, timing information, and an active application or device state.

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