Lighting method for vacuum fluorescent display with reduced flickering
US4791337A · kind A · utility
7Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1986 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | May 8, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A lighting method for vacuum fluorescent display which is lighted dynamically with frequency f.sub.1 includes applying a time-varying voltage with approximate frequency of (n+1/2)f.sub.1 to the cathode of the vacuum fluorescent display, where n is a predetermined natural number. By the method described, flickering in the display is suppressed even when, in the dynamical lighting of the vacuum fluorescent display, the cathode of the vacuum fluorescent display is heated with a time-varying voltage and the lighting duty ratio is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.