Touch panel testing using mutual capacitor measurements
US9122361B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2012 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Dec 26, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/047
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitive touch panel is tested for the presence or absence of short and open circuits in drive and sense lines without the use of a tool that touches the surface of the panel. During a first stage of testing, drive lines of the touch panel are sequentially driven while the remaining drive lines are floated. Sense lines are read to indicate whether a driven drive line is shorted to an adjacent drive line, an open circuit, or coupled to a sense line that is an open circuit. During a second stage of testing, drive lines are driven while alternate sense lines are floated or enabled. The signals on the enabled sense lines are acquired to indicate whether the enabled sense lines are shorted to adjacent sense lines. This second stage can be repeated, switching the roles of the sense lines, to determine the locations of short and/or open circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.