Optical fingerprint sensing system with common mode compensation
US11847854B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2021 |
| Grant date | Dec 19, 2023 |
| Priority date | — |
| Expiry date | Jun 10, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fingerprint sensing system for sensing a finger surface of a finger, comprising: a plurality of pixel elements, each pixel element in the plurality of pixel elements comprising: a photo-sensitive element configured to provide a current including a fingerprint signal current component and a common-mode signal current component; and an integrating capacitor including a first electrode coupled to the photo-sensitive element for receiving the current provided by the photo-sensitive element, and a second electrode; and a current source arrangement coupled to the first electrode of the integrating capacitor of each pixel element in the plurality of pixel elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.