Multi-function key input device
US4885580A · kind A · utility
81Cited by
22References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1988 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Mar 15, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/916
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multi-function key input device having a touch panel serving as a key input means, which is operated separately according to different operational modes to display different symbols or matters with the aid of a central processing section, a memory section, a digital shift register and LCD drivers operating a liquid crystal device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.