Touch panel sensing circuit
US8259087B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2010 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | May 11, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a capacitance sensing analog circuit of a touch panel sensing circuit, by raising a magnitude of a current flowing through a sensing capacitor to form an amplified sensing capacitance, while sensing the amplified sensing capacitance with the aid of pulse width modulation signals, higher resolution of the original sensing capacitance may thus be achieved. Besides, by using a self-calibrating capacitance sensing circuit on the touch panel sensing circuit, linear errors and DC errors of an output signal of the capacitance sensing analog circuit may be filtered off, and thereby resolution of a capacitance amplifying ratio may be effectively raised so as to relieve errors within the capacitance amplifying ratio caused by noises.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.