11 Aug
2006
11 Aug
'06
5:50 p.m.
LCD panels have two connections: A data cable (20 to 60 pins), and the
backlight.
The data cables are totally non-standard and unique, unless you got a panel
that takes VGA or video inputs (this is extremely rare and not the norm).
Almost every single panel is different from almost every other panel, and
the connectors are impossible to get in small quantities.
The backlight is just the two ends of a cold-cathode Fluorescent lamp tube 6
to 16 inches long, depending on the size of the LCD panel. It goes to a
high voltage inverter mounted in the lid of the laptop with the LCD panel
which produces 400 to 2,000 volts to start and run the lamp. [some larger
LCD panels have multiple lamps].
The chances of being able to successfully use an LCD panel from a laptop for
any other purpose are near zero.
11 Aug
11 Aug
9:22 p.m.
On 8/11/2006 at 8:50 PM Barry Watzman wrote:
The backlight is just the two ends of a cold-cathode
Fluorescent lamp tube
6to 16 inches long, depending on the size of the LCD panel.
Some of the older/smaller LCD displays use EL backlighting. Still need an
inverter to drive the thing, though.
Cheers,
Chuck
12 Aug
12 Aug
10:58 a.m.
On Saturday 12 August 2006 12:22 am, Chuck Guzis wrote:
On 8/11/2006 at 8:50 PM Barry Watzman wrote:
This one is definitely older/smaller than what he was talking about (not a
laptop panel by any means!), and I'm thinking that's what's in there, based
largely on the two wires being the same color (both red).
What I'm wondering is whether or not there's any way to test the stuff
connected to that point to find out what the heck it is...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
The backlight is just the two ends of a
cold-cathode Fluorescent lamp tube
6to 16 inches long, depending on the size of the LCD panel.
Some of the older/smaller LCD displays use EL backlighting. Still need an
inverter to drive the thing, though.
11:39 a.m.
On 8/12/2006 at 1:58 PM Roy J. Tellason wrote:
What I'm wondering is whether or not there's
any way to test the stuff
connected to that point to find out what the heck it is...
Well, if I were to take a guess at it, I'd first make sure that neither
lead had any sort of continuity to ground or any other power or signal
lead. If it's an EL panel, there's basically no resistive characteristic
to it; it's purely capacitive. If a few tests bear that out (curve
tracer?), I'd go ahead and try applying a moderate (~90 v) AC voltage to
it ballasted through about a megohm and see if anything lights up.
Cheers,
Chuck
11:54 a.m.
On Saturday 12 August 2006 02:39 pm, Chuck Guzis wrote:
On 8/12/2006 at 1:58 PM Roy J. Tellason wrote:
Sounds like a plan to me...
90VAC? They take that much? Hm.
The other option I've got is to remove the metal bit that's on the front of
the display, which has just some twist-tabs holding it in place. I'm
reluctant to do so, though, because of having had some bad experiences in
the past with those "zebra" connectors shifting and never quite working right
after that.
I'll figure something out.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
What I'm wondering is whether or not
there's any way to test the stuff
connected to that point to find out what the heck it is...
Well, if I were to take a guess at it, I'd first make sure that neither
lead had any sort of continuity to ground or any other power or signal
lead. If it's an EL panel, there's basically no resistive characteristic
to it; it's purely capacitive. If a few tests bear that out (curve
tracer?), I'd go ahead and try applying a moderate (~90 v) AC voltage to
it ballasted through about a megohm and see if anything lights up.
12:38 p.m.
On 8/12/2006 at 2:54 PM Roy J. Tellason wrote:
90VAC? They take that much? Hm.
Yes--there was an inverter for it somewhere. EL typically doesn't draw
much current, so an inverter from one of those "neon wire" kits should do
fine, if you don't want to wire up your own. Frequency isn't very critical
either.
Cheers,
Chuck
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