Capacitive sensing array device including electrostatic damage prevention means
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Sep 25, 2000
filing date -
Sep 24, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitive sensing array device, particularly a fingerprint sensing array device, includes an array of sense electrodes covered by a dielectric layer defining a sensing surface over which, for example, a person's finger is placed in use. Each sense electrode is associated with an overlying, electrically isolated, second electrode on the sensing surface. One or more adjacent conductor lines at a predetermined potential are also carried on the sensing surface, e.g. in the form of a grid surrounding and spaced from the second electrodes and the second electrode and/or its adjacent conductor line is shaped at a part thereof so as to encourage electrical flash-over at a reduced potential level at that part and prevent damage being caused by electrostatic charges carried by a person's finger.
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