Method of and system for compensating for injection gradient in a capacitive sensing circuit array
US6819784B1 · kind B1 · utility
6Cited by
10References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2000 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Apr 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fingerprint sensor includes an array comprising a plurality of capacitive pixel cells. Each of the capacitive pixel cells includes a pair of metal plates and a reset transistor. The reset transistor includes a gate, a source connected to one of the metal plates and a drain connected to the other of the metal plates. A reset buffer generates a reset signal. A regenerator is associated with each reset transistor of each capacitive pixel cell. The regenerator regenerates the reset signal received from the reset buffer to eliminate injection gradient over the array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.