Finger detection device and method of fingerprint recognition integrated circuit
US9395801B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2014 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Mar 6, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A finger detection device and method of a fingerprint recognition IC is disclosed. The device comprises sensing electrodes, a capacitive sensing layer, a signal processing circuit, a multiplexer module and a signal register. The sensing electrodes are defined as a fingerprint sensing zone. The capacitive sensing layer covers the sensing electrodes. The signal processing circuit is arranged below and electrically connected with the sensing electrodes. The multiplexer module defines a finger detection zone. The finger detection zone includes at least one of the sensing electrodes. The signal register is electrically connected with the signal processing circuit, receiving a detection signal generated by the finger detection zone and comparing the detection signal with a preset value. The finger detection device uses only a portion of the sensing electrodes to detect a finger approaching/contacting it to determine triggering or sleeping of the fingerprint recognition IC and thus reduces power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.