Variably dimensioned capacitance sensor elements

A capacitance sensing apparatus for sensing an object proximate to a capacitance sensing surface, said apparatus comprising:

• a first capacitance sensor element;
• and
• a second capacitance sensor element, wherein said first capacitance sensor element has a size that is different from that of said second capacitance sensor element;
• wherein dimensions of said first and second capacitance sensor elements are selected such that a first background capacitance, if measured by said first capacitance sensor element in the absence of said object, and a second background capacitance, if measured by said second capacitance sensor element in the absence of said object, are substantially equal.

A capacitance sensing apparatus comprising:

• a reference sensing surface;
• a first capacitance sensor element traversed by said sensing surface, said first capacitance sensor element configured to sense a capacitance induced when an object is proximate to said sensing surface;
• and
• a layer of material disposed between said sensing surface and said first capacitance sensor element, wherein an attribute of said layer of material is non-uniform across said layer such that said layer of material has an uneven effect on capacitance;
• wherein if said object is at a first position on said sensing surface, a first capacitance is induced, and if said object is at a second position on said sensing surface, a second capacitance is induced;
• and wherein said first capacitance sensor element is dimensioned to compensate for said effect such that said first and second capacitances are substantially equal.