toxadi
Joined: 08 Mar 2002
Posts: 24
Location: Greece
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 21 Jul 2002 16:37 |
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Sailor_EDA
It looks like that you will have a lot of work to do, expensive materials to use and plenty of time to waste... Personally I would not even dare start it.
LCD pannels are quite difficult to drive using your own driver. I do not know if there are any LCD drivers available for such big pannels but if you want to drive them yourself you should have some things in mind.
LCD screens work by scanning a big two dimentional matrix of pixels. You have X axis and Y axis. One of those two, lets say X is driven by a clock and is common for all pixels in the same row. Each row is scanned at a time. There are two kinds of LCD pannels, those who lit "in phase" and those that lit "out of phase". This means that in order to "lit" a pixel at y=5, if the clock at X is low then you must provide low for "in phase" pannels and high for the "out of phase" kind in the fifth y pin. That means that you must always provide power and oscillation at all pixels even if you want them "off".
X _________----------_______----------_______--
y5 ------------_______------------------------------_
inph....tr..........tr............tr..........ref.........tr
outph..ref........ref.........ref..........tr..........ref
where "tr" is for transparrent and "ref" for reflective (lit) pixel.
In fact it is quite more complex but, sorry, I cannot explaint it 
You should use many many pieces of very high frequency amplifiers and a "huge" controller to decode svga signal into that matrix.
An other idea yould be to use LCD controllers that can do smaller pieces of the pannel and somehow enable them one at a time disconnecting the others from the same line.
The only sane sollution would be to use its own controller and try to find the way this controller works.
br
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