Sensing method and circuit for a capacitive touch panel
US8378987B2 · kind B2 · utility
1Cited by
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8Claims
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Key dates
| Filing date | Jul 14, 2010 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Sep 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960775
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sensing method for a capacitive touch panel includes charging a measure capacitor, setting the voltage across a mutual capacitor at the intersection of two traces of the capacitive touch panel, and then injecting partial charges of the measure capacitor into the mutual capacitor. When the intersection is touched, the capacitance value of the mutual capacitor is changed, and consequently the amount of charges injected into the mutual capacitor is changed. Hence, the voltage of the measure capacitor could be detected to determine whether or not the intersection is touched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.