Fingerprint sensor with controllable resolution
US9971926B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2017 |
| Grant date | May 15, 2018 |
| Priority date | — |
| Expiry date | Apr 11, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1329
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
There is provided a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensor comprising: a protective dielectric top layer to be touched by the finger; a two-dimensional array of electrically conductive sensing structures arranged underneath the top layer; readout circuitry coupled to each of the electrically conductive sensing structures to receive a sensing signal indicative of a distance between the finger and the sensing structure, the readout circuitry comprising a plurality of signal amplifiers arranged underneath the array of electrically conductive sensing structures, wherein a number of signal amplifiers is lower than a number of sensing structures; and selection circuitry coupling each of the sensing structures to at least one signal amplifier and configured to select a sensing structure to be coupled to a corresponding signal amplifier. There is also provided a method for controlling a fingerprint sensing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.