Sensing circuit for use with capacitive touch panel
US8681110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2010 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Oct 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A sensing circuit of a capacitive touch panel includes an operation amplifier, a first switch, a second switch, first and second feedback capacitors, a third switch, a fourth switch, a fifth switch and a sixth switch. The operation amplifier includes a positive input terminal, a negative input terminal and an output terminal. A reference voltage is inputted into the positive input terminal. The first switch is connected between a receiving electrode and the negative input terminal. The second switch is connected between the negative input terminal and the output terminal. The third switch is connected to the negative input terminal and the first feedback capacitor. The fourth switch is connected to the first feedback capacitor and the output terminal. The fifth switch is connected to the negative input terminal and the second feedback capacitor. The sixth switch is connected to the second feedback capacitor and the output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.