Kinescope with compensated conduction characteristic
US4631591A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Feb 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video monitor includes an image displaying kinescope which exhibits a temperature dependent conduction characteristic that results in declining light output and image brightness during an initial warm-up period, from a time soon after the system is initially energized to a time several minutes later when steady-state operation is reached. To counteract the declining kinescope light output during the warm-up interval, a compensation circuit having a time constant characteristic which approximates the kinescope conduction characteristic during the warm-up interval causes the kinescope to exhibit increasing light output and image brightness during the warm-up interval. Thus substantially uniform light output is produced over the warm-up interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.