Energizing arrangement for controlling the luminous intensity of at least one discharge lamp and use of such arrangement
US4649322A · kind A · utility
7Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Jan 23, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3927
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The arrangement of the invention enables control of a light emitting element comprising at least one discharge tube. Firing of the tube is effected by a generator which provides voltage pulses at predetermined periodic intervals (T.sub.r). The luminous intensity of the tube is controlled by a D.C. source which enables application of a discharge maintenance current to the tube, the duration of application (T.sub.c) of which depends on an instruction signal. A circuit is provided to assure synchronism between the application of the voltage pulse and the maintenance current. The arrangement may be applied in matrix displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.