Ground detection circuit for video signal driver to prevent...

Details Ground detection circuit for video signal driver to prevent... Ground detection circuit for video signal driver to prevent...

2011-03-08

2011-03-08

Nguyen, Danny (Department: 2836)

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

C361S056000

Reexamination Certificate

active

07903384

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.

REFERENCES:
patent: 4412253 (1983-10-01), Oguino
patent: 4825294 (1989-04-01), Johnson
patent: 5216335 (1993-06-01), Lee
patent: 2004/0021796 (2004-02-01), Fang et al.
patent: 2004/0169980 (2004-09-01), Amano et al.
patent: 2005/0275756 (2005-12-01), Miura
patent: 2009/0080134 (2009-03-01), Kang

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