Method of and apparatus for sensing the location, such as coordinates, of designated points on an electrically sensitive touch-screen surface
US4806709A · kind A · utility
234Cited by
8References
36Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for determining the location of a designated point on an electrically sensitive touch-screen surface while minimizing aberrations introduced by non-uniformity in the field applied to the surface, by attaching a plurality of field-producing discrete point electrodes to widely spaced points on the surface in a predetermined geometric pattern and by measuring the currents drawn from the point electrodes upon the capacitive touching of a designated location on the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.