Synchronous raster scan apparatus for display device
US4196431A · kind A · utility
7Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1977 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Feb 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display device includes improved raster scan apparatus which provides for the video display of information in timed synchronization with cycles of AC power. The raster scan apparatus includes a circuit which monitors the periodicity of the AC input power to the display device. This circuit is operative to initialize certain raster scan logic which thereafter authorizes the next raster scan sweep. In this manner, each raster scan is synchronized with respect to the cyclical AC power. This synchronization eliminates visible distortion on the video output of the display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.