Multitouch touch-sensitive device with multifrequency capacitive detection
US9092100B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2012 |
| Grant date | Jul 28, 2015 |
| Priority date | — |
| Expiry date | Feb 5, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a matrix-form touch pad comprising conductive rows and columns, said pad being linked to control means and electronic reception and analysis means. The control means generate, for each conductive row and column, a first periodic emission voltage emitted at a first working frequency and a second periodic emission voltage emitted at a second discrimination frequency, different from the first frequency. The electronic reception and analysis means are arranged so as to determine, for each row and for each column, the impedance of a first reception voltage at the working frequency and the impedance of a second reception voltage at the discrimination frequency. According to predetermined values, the values of the two impedances are representative of a touch on the touch pad and its location on the row or on the column concerned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.