Fingerprint sensor element
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United States of America Patent
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Jan 4, 2011
Issued Date -
N/A
app pub date -
Jun 18, 2004
filing date -
Jun 18, 2004
priority date (Note) -
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Abstract
The present invention relates to a fingerprint sensor element, comprising a sensor electrode formed in an upper conducting layer, a lower electrode formed in a lower conducting layer and at least one insulating layer between the upper conducting layer and the lower conducting layer. It further comprises a charge amplifier having a negative and a positive input terminal and an output terminal. An upper side of the fingerprint sensor electrode is arranged for facing a finger and a lower side is arranged for facing the lower electrode, and the fingerprint sensor electrode and the lower electrode are arranged in such a way that a capacitance is formed between them. The sensor electrode is arranged for being connected to the negative input terminal of the charge amplifier, and the lower electrode is arranged for being connected to the output terminal of the charge amplifier.
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