Capacitive sensing apparatus designs

A system comprising:

• a plurality of electrically conductive sensing elements that have widths that vary according to a periodic waveform and lengths that traverse a sensing region, said sensing elements comprising a first sensing element, a second sensing element and a third sensing element, wherein said third sensing element comprises a first variable-width portion disposed adjacent a first edge of said sensing region and a second variable-width portion disposed adjacent a second edge of said sensing region opposite said first edge;
• and
• sensing circuitry coupled to said plurality of sensing elements, said sensing circuitry operable for receiving a first sensor signal from said first sensing element and a second sensor signal from said second sensing element, said sensing circuitry also operable for receiving a third sensor signal comprising a sensor signal from said first portion combined with a sensor signal from said second portion.

A capacitive sensing apparatus comprising:

• means for sensing comprising a first means, a second means and a third means that each have widths that vary according to a periodic waveform and lengths that traverse a sensing region, wherein said third means comprises a first variable-width portion disposed adjacent a first edge of said sensing region and a second variable-width portion disposed adjacent a second edge of said sensing region opposite said first edge;
• wherein a first sensor signal is output from said first means and a second sensor signal is output from said second means, and wherein a sensor signal output from said first portion and a sensor signal output from said second portion are combined to provide a third sensor signal.