Patent ID: 9489559
Filing Date: 2016-11-08
CPC Classification: G06K

Claim Text:
1. An electronic device comprising: a fingerprint sensing system including a plurality of sensing elements, each being configured to capacitively couple to a finger arranged adjacent to said sensing element and to provide a sensing signal indicative of a response to a time-varying finger excitation signal provided to said finger; an electrically conducting housing at least partly enclosing an interior of said electronic device; and housing connection circuitry connected to said electrically conducting housing, and arranged and configured to at least intermittently allow a potential of said electrically conducting housing to follow said finger excitation signal, and to at least intermittently keep the potential of said electrically conducing housing at a reference potential for said electronic device, wherein said housing connection circuitry comprises active circuitry, said active circuitry being controllable to switch said housing connection circuitry between a signal following state in which the potential of said electrically conducting housing is allowed to follow said finger excitation signal and a reference potential state in which the potential of said electrically conducting housing is kept at the reference potential for said electronic device.