Patent ID: 8258986

Claim:
A method, comprising: detecting a presence of a conductive object on a touch-sensor device having a plurality of capacitive keys at respective locations on the touch-sensor device, wherein each of the plurality of capacitive keys comprises a unique combination of three or more sensor elements from three or more separate groups of one or more sensor elements; and detecting activation of a first capacitive key of the plurality of capacitive keys when the presence of the conductive object is detected on the unique combination of three or more sensor elements corresponding to the first capacitive key, wherein the first capacitive key comprises: a first ring-shaped segment of a first group of the three or more separate groups, a second ring-shaped segment of a second group of the three or more separate groups disposed within the ring of the first ring-shaped segment; and a third ring-shaped segment of a third group of the three or more separate groups disposed within the ring of the second ring-shaped segment.