Resistive finger detection for fingerprint sensor
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United States of America Patent
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Dec 16, 2003
Grant Date -
N/A
app pub date -
Aug 28, 2000
filing date -
Aug 28, 2000
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Within a capacitive fingerprint detection device, finger detection is provided by a plurality of resistive grids overlying the fingerprint sensor electrodes to measure the resistance of the finger placed on the sensor surface. A finger placed on the sensor surface connects the resistive rids and allows the skin resistivity to be measured. The measured resistance is compared to a reference resistance or range of resistances to determine whether the measured resistance matches the expected bio-characteristics of living skin tissue. The finger detection thus provides anti-spoofing protection for the fingerprint detection device.
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