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How do I keep my LCD monitor 'alive'

P

Pussels

Jan 1, 1970
0
I just bought an expensive 10.4" daylight readable LCD monitor for a
project.

The problem is that the monitor is designed to blank to no image (black) if
no video signal is present.

My video source can be a little noisy, ie dropped frame every now and again
because the video camera is on a small mobile vehicle tramsmitting video
over a video sender and occasionaly you get a droped frame or two.

If I connect the video input to a another monitor without this blanking
circuit, the video is much more constant, but with some of the frames seen
with noise etc (which cause the other monitor to blank to no picture for
about a second).

Can anybody suggest a way to 'fool' the monitor into thinking that is always
has a 'solid' video signal, but display the signal with dropped frames
and/or noise.

Any help would be very greatly appreciated. The manufacturer said this
blanking circuit cannot be disabled.

Brian
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Pussels <[email protected]>
Any help would be very greatly appreciated. The manufacturer said this
blanking circuit cannot be disabled.

If the blanking detects absence of sync pulses, you might win with a
sync regenerator, but it could be a brute-force solution.
 
M

martin griffith

Jan 1, 1970
0
I just bought an expensive 10.4" daylight readable LCD monitor for a
project.

The problem is that the monitor is designed to blank to no image (black) if
no video signal is present.

My video source can be a little noisy, ie dropped frame every now and again
because the video camera is on a small mobile vehicle tramsmitting video
over a video sender and occasionaly you get a droped frame or two.

If I connect the video input to a another monitor without this blanking
circuit, the video is much more constant, but with some of the frames seen
with noise etc (which cause the other monitor to blank to no picture for
about a second).

Can anybody suggest a way to 'fool' the monitor into thinking that is always
has a 'solid' video signal, but display the signal with dropped frames
and/or noise.

Any help would be very greatly appreciated. The manufacturer said this
blanking circuit cannot be disabled.

Brian
This is a bit of a kludge, but look at the Intersil sync separators
EL1883 /EL4583etc(there are quite a few to choose from).
http://www.intersil.com/cgi-bin2/Ms..._ON=Y&ALLCATS=X&EN=X&NO_DL=X&QUERY=video sync

You use the sync generator which is locked to the incoming video feed
to supply syncs to the monitor when the incoming video is bad. You
detect the bad video by looking at the RSSI signal strength pin on the
Rx and use a video switch, (Maxim etc) to toggle between the real
video and th locally generated.

You will probably need to provide hystersys so that when the RSSI "is
on the edge" it doesnt keep flipping too often

I dont think this is a one chip solution. It might be quicker to get a
different LCD


martin


Opinions are like assholes -- everyone has one
 
P

Pussels

Jan 1, 1970
0
thanks fellas, I will give those ideas a try.

Brian
 
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