Capacitive sensing array having electrical isolation
US10628654B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2019 |
| Grant date | Apr 21, 2020 |
| Priority date | — |
| Expiry date | May 14, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitive fingerprint sensor that may be formed of an array of sensing elements. Each capacitive sensing element of the array may register a voltage that varies with the capacitance of a capacitive coupling. A finger may capacitively couple to the individual capacitive sensing elements of the sensor, such that the sensor may sense a capacitance between each capacitive sensing element and the flesh of the fingerprint. The capacitance signal may be detected by sensing the change in voltage on the capacitive sensing element as the relative voltage between the finger and the sensing chip is changed. Alternately, the capacitance signal may be detected by sensing the change in charge received by the capacitive sensing elements as the relative voltage between the finger and the sensing chip is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.