Method and apparatus for operating a capacitive tactile keyboard
US5525980A · kind A · utility
32Cited by
4References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1993 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Apr 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for determining a valid selection of a capacitance tactile keyboard as a function of a selection state and validation state of the keyboard. The selection state is determined from measured capacitive values of each key by during a first phase of a cycle. The validation state is determined from measured pressure on the keyboard, for certain key selection states only, during a second phase of the cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.