Stable brightness vacuum fluorescent display
US4859912A · kind A · utility
23Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1985 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Aug 26, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To avoid non uniform brightness or flickering of a vacuum fluorescent display especially at low brightness levels anodes energizing pulses sent to each end of the display are coordinated with the AC filament current so that successive pulses or group of pulses are initiated at opposite phases of the filament current at sufficiently high rates to time average the light variations of a critical flicker fusion period to obtain uniform perceived display brightness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.