Video display apparatus with scan conversion and reversion and a video display method using scan conversion and reversion
US6429899B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Jul 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0229
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal of an interlaced scanning system having 525 scanning lines and a vertical scanning frequency of 60 Hz is converted to a video signal having 1050 scanning lines and a vertical scanning frequency of 120 Hz, for displaying an image by bidirectional scanning. A vertical synchronizing signal is subjected to offset processing by a ¼ horizontal scanning period when an odd field is started, thereby keeping interlaced relation between odd and even fields. The vertical synchronizing signal is subjected to offset processing by a ½ horizontal scanning period every frame, so that the scanning direction for each scanning line is reversed every frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.