Fingerprint Sensor Equipment
First Claim
1. A fingerprint sensor element, comprising a fingerprint sensor electrode formed in an upper conducting layer, a lower electrode formed in a lower conducting layer, at least one insulating layer between the upper conducting layer and the lower conducting layer, a charge amplifier having a negative input terminal and a positive input terminal and an output terminal, wherein an upper side of the fingerprint sensor electrode is arranged for facing a finger, and wherein a lower side of the fingerprint sensor electrode is arranged for facing the lower electrode, where the fingerprint sensor electrode and the lower electrode are arranged in such a way that a capacitance is formed between them, wherein the sensor electrode is arranged for being connected to the negative input terminal of the charge amplifier, wherein the lower electrode is arranged for being connected to the output terminal of the charge amplifier.
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Accused Products
Abstract
The present invention relates to a fingerprint sensor element, comprising a sensor electrode (11) formed in an upper conducting layer (M3), a lower electrode (17, 32) formed in a lower conducting layer (M2, P2) and at least one insulating layer (8, 9, 10, 22) between the upper conducting layer (M3) and the lower conducting layer (M2, P2). It further comprises a charge amplifier (13) having a negative (12) and a positive (14) input terminal and an output terminal (18). An upper side (11a) of the fingerprint sensor electrode (11) is arranged for facing a finger (5) and a lower side (11b) is arranged for facing the lower electrode (17), and the fingerprint sensor electrode (11) and the lower electrode (17) are arranged in such a way that a capacitance (Cref) is formed between them. The sensor electrode (11) is arranged for being connected to the negative input terminal (12) of the charge amplifier (13), and the lower electrode (17) is arranged for being connected to the output terminal (18) of the charge amplifier (13).
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Citations
21 Claims
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1. A fingerprint sensor element, comprising
a fingerprint sensor electrode formed in an upper conducting layer, a lower electrode formed in a lower conducting layer, at least one insulating layer between the upper conducting layer and the lower conducting layer, a charge amplifier having a negative input terminal and a positive input terminal and an output terminal, wherein an upper side of the fingerprint sensor electrode is arranged for facing a finger, and wherein a lower side of the fingerprint sensor electrode is arranged for facing the lower electrode, where the fingerprint sensor electrode and the lower electrode are arranged in such a way that a capacitance is formed between them, wherein the sensor electrode is arranged for being connected to the negative input terminal of the charge amplifier, wherein the lower electrode is arranged for being connected to the output terminal of the charge amplifier.
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3. A fingerprint sensor element according to, wherein the sensor electrode is directly connected to the negative input terminal of the charge amplifier and wherein the lower electrode is directly connected to the output terminal of the charge amplifier.
Specification