Capacitive fingerprint sensor
US8766651B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2012 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Sep 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/9622
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The capacitive fingerprint sensor according to the exemplary embodiments of the present invention includes: a fingerprint sensing electrode Cfp for sensing a human fingerprint; a first transistor T1 in which the amount of currents flowing therethrough changes depending on an output voltage of the fingerprint sensing electrode Cfp; a second transistor T2 in which the amount of currents flowing therethrough changes due to a difference between the currents flowing through the first transistor T1; and a third transistor T3 which resets a gate electrode of the first transistor T1 and provides capacitive coupling with the gate electrode of the first transistor T1 via a pulse signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.