Optical fingerprint sensor and fingerprint identification method thereof
US10984217B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 26, 2019 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Oct 1, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/041
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical fingerprint sensor and a fingerprint identification method are provided. The optical fingerprint sensor includes a photosensitive element and a signal processing circuit. The signal processing circuit includes a logic unit, a variable/programmable gain amplifier and a processing unit. The logic unit is electrically coupled to the photosensitive element. The variable/programmable gain amplifier is electrically coupled to the logic unit. The processing unit is electrically coupled to the variable/programmable gain amplifier and the logic unit. The variable/programmable gain amplifier adaptively switches a gain between a first gain value and a second gain value, wherein the second gain value is larger than the first gain value. After the signals inputted into the variable/programmable gain amplifier are properly processed according to the first gain value or the second gain value, the optical fingerprint sensor acquires a sharp sensing image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.