Active matrix capacitive fingerprint sensor with 1-TFT pixel architecture for display integration
US9958993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2015 |
| Grant date | May 1, 2018 |
| Priority date | — |
| Expiry date | Aug 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Embodiments described herein include a method for operating an input device by applying a charge voltage to a sense element through a first transistor that is between the sense element and a column output line and a first switch that is between the column output line and a drive voltage. The method also includes storing an electric charge on the sense element, wherein the electric charge comprises a magnitude corresponding to a feature of an input object. The method also includes driving a gate terminal of the first transistor low and disconnecting the charge voltage via the first switch. The method further includes transferring the electric charge to a feedback capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.