Sensing method of fingerprint sensor and related sensing circuit
US9721140B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2016 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Feb 19, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1329
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A sensing method of a fingerprint sensor includes the following steps: (a) applying a first voltage, a second voltage and a third voltage to a first node connected to an electrode plate to be measured, a second node disconnected from the first node, and a conductor adjacent to the electrode plate to be measured, respectively; (b) providing a first finger drive voltage for a finger; (c) stopping applying the first, second and third voltages to the first node, the second node and the conductor, respectively; (d) after step (c), applying a fourth voltage to the conductor, and connecting the first node to the second node; (e) after steps (b) and (c), providing a second finger drive voltage for the finger; and (f) after steps (d) and (e), obtaining a measurement result of the electrode plate to be measured according to a signal on the second node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.