Bi-directional scan circuit
US5341072A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1993 |
| Grant date | Aug 23, 1994 |
| Priority date | — |
| Expiry date | Jun 18, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/227
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
At a horizontal deflecting circuit of bi-directional deflection, timings of deflection of forward scan path and backward scan path are respectively controlled. The timing of deflection of forward path or backward path is controlled at the first timing control circuit 22 so that it is synchronized with the horizontal synchronizing signal HD and timing of deflection of backward path or forward path is controlled at the second timing control circuit 24 so that deflection cycles of forward path and backward path are equalized. Further, timings of deflection of forward scan path and backward scan path are controlled respectively at first and second phase comparison circuits 22 and 24 so that the relation in phase between the image signal and the deflection takes a constant value on the basis of the horizontal synchronizing signal, to previously prevent occurrence of steady phase error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.