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CAPACITIVE FINGERPRINT SENSING DEVICE WITH DEMODULATION CIRCUITRY IN SENSING ELEMENT
专利权人:
发明人:
RIEDIJK FRANK
申请号:
IN201727013345
公开号:
IN201727013345A
申请日:
2017.04.13
申请国别(地区):
IN
年份:
2017
代理人:
摘要:
The present invention relates to a capacitive fingerprint sensing system comprising excitation signal providing circuitry and a plurality of sensing elements. Each sensing element includes a protective dielectric top layer an electrically conductive sensing structure coupled to the excitation signal for providing a sensing signal indicative of a change of a charge carried by the sensing structure resulting from a change in potential difference between the finger and the sensing structure and demodulation circuitry connected to the sensing circuitry for combining the sensing signal and a demodulation signal being timing related to the excitation signal to provide a combined signal including a DC signal component indicating the change of the charge carried by the sensing structure. The fingerprint sensing system further comprises readout circuitry connected to each of the sensing elements for providing a representation of the fingerprint pattern based on the DC signal component from each of the sensing elements.
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