Method and apparatus for correcting image errors caused by residual magnetism in a picture tube
US6107743A · kind A · utility
0Cited by
12References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1998 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Nov 20, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/29
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and apparatus for correcting image errors caused by residual magnetism in monitors and other such display devices based on picture tubes. The method according to the invention is based on the removal of residual magnetism by means of an alternating damped magnetic field. In the method, the internal and external structures in the neck part (11) of a picture tube (10) are subjected to an alternating damped magnetic field produced by means of a coil (45).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.