Touch detection for a digitizer
US7372455B2 · kind B2 · utility
204Cited by
43References
42Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2004 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Apr 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04106
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A detector for detecting touches by fingers or like body parts on a sensor comprises at least one sensing conductor, typically a grid of such conductors, extending into the sensor, a source of oscillating electrical energy at a predetermined frequency, and detection circuitry for detecting a capacitive influence on the sensing conductor when said oscillating electrical energy is applied, the capacitive influence being interpreted as a touch. The detector is advantageous in that the same sensing conductors can be used both for touch sensing and for detection of an electromagnetic stylus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.