Electrostatic capacitance detection device and smart card
US7327596B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2005 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Apr 11, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electrostatic capacitance detection device, for detecting electrostatic capacitance that changes in accordance with a distance from a target object to read surface contours of the target object, can sense electrostatic capacitance highly accurately even with using thin-film semiconductor devices. The electrostatic capacitance detection device includes electrostatic capacitance detection elements arranged in M rows and N columns, a power supply line that supplies power to the electrostatic capacitance detection elements, an output line that outputs a signal from the electrostatic capacitance detection elements, M row lines that select the electrostatic capacitance detection elements disposed on a specific row, and N column lines that select the electrostatic capacitance detection elements disposed on a specific column. Further, the electrostatic capacitance detection elements each include a signal detection element, a row selection element, a column selection element, and a signal amplification element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.