Degaussing system for cathode ray tube which prevents display of visual distortion
US5742127A · kind A · utility
4Cited by
5References
10Claims
0Family size
Inventor
Key dates
| Filing date | Jan 4, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Jan 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/29
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for degaussing a cathode ray tube (CRT) which avoids displaying a distorted picture to the user when a magnetic field is degaussed while the CRT is on. The system of the present invention recognizes when a user has pressed a button to initiate the manual degaussing operation, controls the brightness and contrast of the CRT so that the displayed picture becomes black, degausses the CRT while the picture appears black, and controls the brightness and contrast of the CRT to levels present before degaussing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.