Surface capacitance sensor system using buried stimulus electrode
US7259573B2 · kind B2 · utility
7Cited by
96References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 22, 2002 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | May 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A surface capacitance sensor system is implemented as an array of sensor electrodes near the surface of the integrated circuit and an array of stimulus electrodes below the sensor electrodes. Rows of stimulus electrodes are driven by sources while the voltages at the respective sensor electrodes are measured. Voltage measurements at each sensor electrode allow the surface capacitance at each sensor electrode location to be determined. The capacitance data is used to determine the positions of target electrodes above the array surface as required in the location fingerprint artifacts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.