Patent ID: 7737953
Filing Date: 2010-06-15
Classification: G06F

Abstract:
1. A capacitive sensing device comprising: a first sensing element having varying depth relative to a capacitive sensing reference surface, said varying depth comprising a waveform; a second sensing element substantially parallel to said first sensing element, and having varying depth relative to said capacitive sensing reference surface, said varying depth of said second sensing element comprising a waveform that is phase shifted by a value with respect to said waveform of said first sensing element; and a third sensing element substantially parallel to said first sensing element, and having varying depth relative to said capacitive sensing reference surface, said varying depth of said third sensing element comprising a waveform that is phase shifted by a second value with respect to said waveform of said first sensing element such that said first sensing element, said second sensing element, and said third sensing element comprise waveforms of three differing phases, wherein said first sensing element, second sensing element, and third sensing element are configured to provide information corresponding to a position of an object proximate to said capacitive sensing reference surface along a first axis of said capacitive sensing reference surface.