Electric apparatus for displaying a plurality of key symbols on a single passive display
US4313108A · kind A · utility
90Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Dec 4, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2231/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric apparatus is adapted to display a plurality of key symbols on a single passive display. A keyboard includes a plurality of input keys for selectively inputting at least numeral data and function data and input keys operated to selectively display key symbols representing numerals, functions, etc. A single passive liquid crystal display is arranged below the keyboard. A plurality of electrodes are arranged on the predetermined areas of the single passive display and the key symbols corresponding to the functions are selectively displayed, by a key operation, on the electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.