Capacitive touch sensor system
US8502801B2 · kind B2 · utility
2Cited by
2References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 23, 2009 |
| Grant date | Aug 6, 2013 |
| Priority date | — |
| Expiry date | Nov 22, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of matrix sensing using delay-based capacitance sensing, including using X-axis lines as active lines for capacitance measurements and using Y-axis lines as a disturbance to identify the location of a touch in a key matrix is disclosed. A sensing signal is applied to the X-axis lines, and a disturbance signal is applied to the Y-axis lines. If a location is touched, cross-capacitance is reduced, which is measured by sweeping data along the X-axis lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.