Freescale Semiconductor,inc.

Tak Kwan Vincent Ko

Bryce T Osoinach

The electrical equivalent of a relatively large area proximity detection capability is provided in a space limited electronic device () with many individual input electrodes () by dynamically coupling parallel groups of the individual electrodes () and applying a proximity and/or contact test thereto. The parallel grouped electrodes act like a single large electrode and permit proximity detection at greater distances and with greater sensitivity. A multiplexer () automatically couples individual input electrodes () and then parallel grouped electrodes to the proximity (or contact) sensor(s) (), so that they are scanned and sensed individually and collectively in a time less than human reaction time, whereby the proximity sense function appears as if provided by a separate large area electrode. Proximity spatial detection accuracy is increased by using some of the electrodes () as driven shields to remove positional ambiguity.

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Hong Kong, China

Tak Kwan Vincent Ko