Enhanced fingerprint detection
US6512381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Dec 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An enhanced fingerprint sensing circuit in which a voltage change is applied to the body during sensing. When the person's fingerprint is being sensed, the person's body is in contact with an electrical terminal. When the sensing occurs, the voltage on the electrical terminal changes, which changes the voltage on the person's body. The pattern of the fingerprint performs two functions in the sensing circuit. In addition to being a plate of a capacitor whose distance is being sensed, it is now a source of input charge as well. The electrical effect on the cell of a voltage change on a person's finger is different at a ridge than at a valley in the fingerprint sensing circuit. Thus, the input capacitance to the sensing circuit is variable, depending upon whether a ridge or a valley is present. The sensing circuit also detects a change in its own capacitance based on the presence of a ridge or a valley. In summary, the person's body acts as the input capacitor to provide a variable charge transfer for the input capacitance and at the same time performs the function of being a variable sensing capacitor value for the capacitive sensor. The fingerprint sensor is thus very sensitive and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.