Compact touch screen controller having multiplexed sense lines
US10152161B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 2015 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | Jun 11, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04111
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch screen controller is for a drive line emitting a periodic signal and capacitively intersecting sense lines. A selection circuit, for each of a number of portions of the periodic signal equal to a number of the sense lines, couples a first subset of the sense lines to a first output path, and couples a second subset of the sense lines to a second output path, the second subset being sense lines not included in the first subset. Processing circuitry, for each portion of the periodic signal, measures a capacitance of the first output path, measures a capacitance of the second output path, and sums the capacitance of the first output path and the capacitance of the second output path. The processing circuitry determines a capacitance between each sense line of the first and second subsets and the drive line as a function of the sums.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.