Video signal processing circuit and method for converting number of scan lines and image display device using the same
US6927800B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2002 |
| Grant date | Aug 9, 2005 |
| Priority date | — |
| Expiry date | Nov 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A double-rate signal achieved by subjecting a video signal to double-rate conversion is supplied to a scan line number converter, wherein the portion of the effective scan lines of the double-rate signal is written into a frame memory based on a signal achieved by multiplying horizontal and vertical synchronous signals of the double-rate signal. In the effective scan line section of an HDTV signal, the video signal written in the frame memory is read out based on horizontal and vertical reference signals of the HDTV signal. Out of the effective scan line section of the HDTV signal, a pedestal level signal written in a memory is read out based on the horizontal and vertical reference signals of the HDTV signal, thereby achieving an HDTV signal whose vertical scan line number is equal to 1125 lines. Accordingly, the HDTV signal suffers no degradation because the video signal in the section of 960 effective scan lines of the double-rate signal is not interpolated
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.