Detection method and apparatus for reduced cross-talk and asic area of a fingerprint sensor
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United States of America Patent
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Apr 18, 2017
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app pub date -
Oct 10, 2014
filing date -
Oct 28, 2013
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Abstract
A method and apparatus for electrical detection of a finger print has a reduced number of interconnect signals between a sensor area and a substrate and an electronic circuit for excitation and detection of the finger print compared to a single-chip finger print sensor. The individual signals are connected internally at the sensor substrate in such a way that the response from the individual sensor elements can be separated from each other. Cross-talk is reduced by keeping the sensor outputs at a constant potential, thus eliminating the effect of capacitive coupling between different sensor outputs and also between sensor outputs and a ground or reference potential.
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