Capacitive fingerprint sensor with sensing elements comprising timing circuitry
US9449212B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2015 |
| Grant date | Sep 20, 2016 |
| Priority date | — |
| Expiry date | Jul 29, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0214
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.