Circuit and method for compensating horizontal centering in video display apparatus
US6414694B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Oct 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/227
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for compensating a horizontal centering in a video display apparatus includes a control circuit, a horizontal centering compensation circuit, and a horizontal deflection output circuit. The circuit functions such that even when the video display mode of a multi-mode monitor is shifted, any biasing of the picture can be automatically minimized or prevented. The control unit counts the frequency of externally input video synchronizing signals to output a first switching control signal or a second switching control signal based on the counted result of the frequency of the video synchronizing signals. The horizontal centering compensation circuit provides a first power and a second power, the first and second powers having voltage levels and directions different from each other, to output the first power or the second power in response to the first switching control signal or the second switching control signal of the control unit. The horizontal deflection output circuit receives a driving power, to generate a magnetic field for deflecting electron beams in response to externally input horizontal driving signals, so as to variably adjust a horizontal center position of a pi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.