Capacitive fingerprint sensor and the panel thereof
US7688082B2 · kind B2 · utility
0Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2008 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Jul 12, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitive fingerprint sensor comprises a first transistor, a second transistor, a fingerprint capacitor and a third transistor. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The first transistor is configured to precharge the fingerprint capacitor. The second transistor is configured to discharge the fingerprint capacitor toward a bias voltage VB. The third transistor is configured to output the voltage of the fingerprint capacitor after discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.