Capacitance detection device, fingerprint sensor, biometric authentication device, and method for searching capacitance detection condition
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United States of America Patent
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Feb 3, 2009
Grant Date -
Aug 18, 2005
app pub date -
Jan 25, 2005
filing date -
Feb 17, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Aspects of the invention can provide a fingerprint sensor for searching for a detection condition in a short period of time in order to read information of ridges and valleys of a fingerprint as changes in capacitance. The fingerprint sensor of the invention can include a plurality of capacitance detection circuits that output a detection signal having ridge/valley information of a fingerprint based on capacitance formed between the sensor and a fingertip surface, a fingerprint detection part in which the plurality of capacitance detection circuits are arranged to intersect with one another in a row direction and a column direction, a plurality of scanning lines, a scanning line driver for driving the scanning line, a plurality of data lines, a data line driver for driving the data line, and search device for searching for a detection condition of ridge/valley information by changing detection conditions of the ridge/valley information in a state that the plurality of capacitance detection circuits arranged along any one of the plurality of scanning lines are being selected.
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