How do I keep my LCD monitor 'alive'

P

Pussels

Guest
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
 
I read in sci.electronics.design that Pussels <gocat@iprimus.com.au>
wrote (in <423d3c2f_1@news.iprimus.com.au>) about 'How do I keep my LCD
monitor 'alive'', on Sun, 20 Mar 2005:

Any help would be very greatly appreciated. The manufacturer said this
blanking circuit cannot be disabled.
Click to expand...
If the blanking detects absence of sync pulses, you might win with a
sync regenerator, but it could be a brute-force solution.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sun, 20 Mar 2005 19:32:36 +1030, in sci.electronics.design
"Pussels" <gocat@iprimus.com.au> wrote:

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
Click to expand...
EL1883 /EL4583etc(there are quite a few to choose from).
http://www.intersil.com/cgi-bin2/MsmFind.exe?CFGNAME=MssFind.cfg&AND_ON=Y&ALLCATS=X&EN=X&NO_DL=X&QUERY=video%20sync

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
 
On Sun, 20 Mar 2005 11:48:56 +0100, in sci.electronics.design martin
griffith <martingriffithX@Xyahoo.co.uk> wrote:

EL4585 is the one
http://www.intersil.com/cda/deviceinfo/0,1477,EL4584,00.html#data




martin


Opinions are like assholes -- everyone has one
 
On Sun, 20 Mar 2005 13:23:42 +0100, in sci.electronics.design martin
griffith <martingriffithX@Xyahoo.co.uk> wrote:

On Sun, 20 Mar 2005 11:48:56 +0100, in sci.electronics.design martin
griffith <martingriffithX@Xyahoo.co.uk> wrote:

EL4585 is the one
http://www.intersil.com/cda/deviceinfo/0,1477,EL4584,00.html#data


or if you are recording onto a DVcam, look through the monitor out,
Click to expand...
this will **possibly** have the syncs regenerated

sorry for the sloppy thinking, should have thought of this before



martin


Opinions are like assholes -- everyone has one
 
thanks fellas, I will give those ideas a try.

Brian


"martin griffith" <martingriffithX@Xyahoo.co.uk> wrote in message
news:ditq31t60baub8end9472us7galk666e10@4ax.com...
On Sun, 20 Mar 2005 13:23:42 +0100, in sci.electronics.design martin
griffith <martingriffithX@Xyahoo.co.uk> wrote:

On Sun, 20 Mar 2005 11:48:56 +0100, in sci.electronics.design martin
griffith <martingriffithX@Xyahoo.co.uk> wrote:

EL4585 is the one
http://www.intersil.com/cda/deviceinfo/0,1477,EL4584,00.html#data


or if you are recording onto a DVcam, look through the monitor out,
this will **possibly** have the syncs regenerated

sorry for the sloppy thinking, should have thought of this before



martin


Opinions are like assholes -- everyone has one
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top