Degaussing apparatus and method for rotatable video display apparatus
US6556412B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/29
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sequential driving type degaussing circuit includes a rotation direction and angle detector for generating each pulse by using a pair of photo sensors and slits to detect a rotation angle and a rotation direction of a television set when it is rotated manually by a viewer; a microcomputer for judging the direction and the angle of the television as rotated manually on the basis of an output pulse of the rotation direction and angle detector, judging the rotation direction and angle of the television when it is rotated automatically by a motor, and outputting a control signal to sequentially drive the degaussing circuit if it is judged that the television set was rotated more than a predetermined angle; and a degaussing circuit unit for sequentially driving one by one a plurality of degaussing circuits under the control of the microcomputer and performing a degaussing function of a CRT. According to a degaussing apparatus and method for a rotatable video display apparatus, the television set is rotatable a maximum of 360° for a viewer's convenience, maintaining screen purity without causing color contamination on the screen caused due to variations in the earth magnetic field …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.