Ground detection circuit for video signal driver to prevent large clamp transistor current
US7903384B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 28, 2008 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Jun 6, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A large current flowing out from video signal line driver is prevented whenever the video signal line is being grounded. The system includes a video signal line driver circuit transmitting video signal at pre-determined DC level, a large current prevention circuit detecting video signal line being shorted to ground and cut-off excessive current source out from video signal line driver circuit into video signal line, a start-up time enhancement circuit improving start-up time of ground detection circuit so that system start-up time is not limited by large current prevention circuit, and a switching threshold control circuit setting the switching threshold of large current prevention circuit and start-up time enhancement circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.