Method and apparatus for increasing the cathode efficiency in a cathode ray tube
US5130606A · kind A · utility
3Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 1990 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | May 9, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A CRT display system is described wherein a measure of the beam current generated within the CRT is derived and the voltage across the cathode heater modified as a function of this measure. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimizing the CRT's working lifetime.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.