Invention Grant
US09449212B2 Capacitive fingerprint sensor with sensing elements comprising timing circuitry 有权
具有包含定时电路的感测元件的电容式指纹传感器

Capacitive fingerprint sensor with sensing elements comprising timing circuitry
Abstract:
The present invention relates to a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensor comprising a plurality of sensing elements, each including: a protective dielectric top layer to be touched by the finger; an electrically conductive sensing structure arranged underneath the top layer; charge measuring circuitry connected to the sensing structure for sequentially transitioning between at least a first measurement state and a second measurement state to perform a measurement sequence resulting in an output signal from the charge measuring circuitry being indicative of a change of a charge carried by the sensing structure resulting from a change in a potential difference between the finger and the sensing structure; and timing circuitry connected to the charge measuring circuitry for controlling a timing of at least one of the measurement states.
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