Fingerprint identification system and electronic device
US10474865B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2017 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Jan 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04107
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provided is a fingerprint identification system, comprising: a plurality of first pixel circuits; a first sensing circuit for sensing a contact capacitance and outputting a first output signal, where the first output signal contains a big signal component and a small signal component, and the small signal component correlates with a change amount of the contact capacitance; at least one second pixel circuit; a second sensing circuit for outputting a second output signal, where the second output signal is equal to the big signal component; and a differential amplifying circuit for amplifying a difference value between the first output signal and the second output signal so as to generate an amplifying output signal, where the amplifying output signal correlates with the small signal component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.