Making a hole in a flat panel display (literally)

[William R. Walsh]

Hi!

Does anyone know what class of nastyness the LC belongs to?

Nope, but I'd sure like to! I probably need to be Googling this now, but I'm
curious where the term "liquid crystal" did originate from...

William

 

[Bob Myers]

"Don Bruder" <dakidd@sonic.net> wrote in message
news:XYDPb.9992$XF6.204950@typhoon.sonic.net...

That's another consideration: LCD displays of ANY type are strongly
polarized - Unless I've completely misunderstood everythign I've ever
learned about them, it's the basic principle of how they work, in fact.
When not energized, the "crystal"'s polarization is "twisted" 90 degrees
to the light source's polarization, blocking transmission. When
energized, it's "untwisted" to match the polarization of the light
source, allowing the light to pass through. This is hinted at in the
name of the old "Supertwist" displays, which used a liquid crystal
compound that, if memory serves correctly, had a *MUCH* wider range of
"twist" available - Something like triple the "range" of normal LCD
material.

That's not quite correct on a couple of points - not ALL types of
LCDs rely on polarization (some work via a switchable light-scattering
effect, for instance), and the way the standard twisted-nematic (TN)
or "supertwist" (STN) types operate isn't quite as described above.
But it's certainly close enough with respect to the vast majority of color
displays that might be used in this application, with regard to the fact
that they DO pretty much all output polarized light. (Using an LCD
display with polarized sunglasses can be interesting, to say the
least...)

Better to go with a plasma panel, if it MUST be a "this flat screen" -
or what's wrong with the good ol' color CRT?

Bob M.

 

[James Sweet]

"William R. Walsh" <newsgroups1@idontwantjunqueemail.walshcomptech.com>
wrote in message news:KeEPb.118113$xy6.376284@attbi_s02...

Hi!

Does anyone know what class of nastyness the LC belongs to?

Nope, but I'd sure like to! I probably need to be Googling this now, but
I'm
curious where the term "liquid crystal" did originate from...

William

IIRC there's a fairly good explaination about the history on
www.howstuffworks.com

 

[YD]

On Wed, 21 Jan 2004 23:00:19 +0800, "DIAMOND Mark R." <dot@dot.dot>
wrote:

I also didn't think it was naive. But then it might be naive not to think
so. I guessed that all pixels immediately below and to the right of the
"hole" would stop working, but I wasn't sure of just how the internal
circuitry is organized. The part that never occurred to me was that the
liquid of the LCD is continuous across all pixels and would leak. I still
actually don't see how the liquid can be a continuous layer AND allow
independent driving of the pixels.

Never mind me, my intention was mainly to set up Fred once again to
show the world what an asshole he is.

Your question was a bit naive in the way that you might have done some
previous research on how displays work before posting up.

- YD.

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[YD]

On Wed, 21 Jan 2004 22:56:22 +0800, "DIAMOND Mark R." <dot@dot.dot>
wrote:

No ... it's not a secret. ... studies on insect vision. Question is how to
construct a display of an experimental stimulus (artificial flower is a good
analogy, even if the stimulus is nothing like a flower) that also provides a
honey bee with a sugar reward. That is the reason for wanting to have a
display surrounding a tube. Typically, a feeder tube comes through a
stimulus pattern drawn on paper, but having a dynamic display, rather than
paper, would be much more useful.

The person who commented on those funny joke flowers which squirt
unsuspecting people in the face was not that far off the mark!

A backlit display will do nicely in this case.

- YD.

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[Fred Bloggs]

YD wrote:

Or were you just setting yourself up
to walk all over a beginner for kicks?

Standard troll propaganda- appeal to losers like yourself with a big
inferiority complex- when in fact your real motive is to disrupt the NG
with your anti-American trash. You have nothing to contribute- you are a
loud mouthed ignoramus- check your posting history-under both Yellow
Dogmanure and ChaosMaster- there is absolutely nothing there besides
superficial garbage and off topic trolling.

Inquiring minds want to know.

- YD.

Well that would not be you then , would it, Yellow Dogmanure.

 

[Mjolinor]

Consequently, their resistor colour code includes two extra colours
that
we can't see. They need them, because they count in twelves, of course.

Shouldn't that be "they count in Bs" , that would be base 11 not 12

Only the very old ones have 5 and a half legs.

There is other evidence that they count in "Beanary", they fart about all
day in the garden and in large numbers can have a similar effect to beans on
the human bowels. I will stick with denary 11 in the abscense of any
stronger evidence to the contrary.

 

[YD]

On Thu, 22 Jan 2004 04:02:30 GMT, Fred Bloggs <nospam@nospam.com>
wrote:

YD wrote:
Or were you just setting yourself up
to walk all over a beginner for kicks?

Standard troll propaganda- appeal to losers like yourself with a big
inferiority complex- when in fact your real motive is to disrupt the NG
with your anti-American trash. You have nothing to contribute- you are a

Huh, where did you see anything anti-American in this?

loud mouthed ignoramus- check your posting history-under both Yellow
Dogmanure and ChaosMaster- there is absolutely nothing there besides

So you finally found something derogatory, took a long time about it
too. Besides, I have no relation to CM. Lay off that bottle for a
while, OK?

superficial garbage and off topic trolling.

Proportionally I have been more on-topic than you. Not very prolific
at either, but hey, I'm busy. As for loud mouthed white trash, check
your own history, not very flattering is it?

Inquiring minds want to know.

- YD.


Well that would not be <*SLAP*

PKB, sweetie.

- YD.
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[Fred Bloggs]

YD wrote:

On Thu, 22 Jan 2004 04:02:30 GMT, Fred Bloggs <nospam@nospam.com
wrote:



YD wrote:

Or were you just setting yourself up
to walk all over a beginner for kicks?

Standard troll propaganda- appeal to losers like yourself with a big
inferiority complex- when in fact your real motive is to disrupt the NG
with your anti-American trash. You have nothing to contribute- you are a


Huh, where did you see anything anti-American in this?

Read it again, stupid. Nobody will be mislead by paying attention to any
particular statement in any particular post. You have made your
intentions clear with hundreds of off-topic and off-charter anti-war and
anti-American posts.

loud mouthed ignoramus- check your posting history-under both Yellow
Dogmanure and ChaosMaster- there is absolutely nothing there besides


So you finally found something derogatory, took a long time about it
too. Besides, I have no relation to CM. Lay off that bottle for a
while, OK?

You are a liar- Yellow Dogmanure Liar- YDL.

superficial garbage and off topic trolling.


Proportionally I have been more on-topic than you.

That is a lie, Yellow Dogmanure Liar-YDL.

Not very prolific
at either, but hey, I'm busy.

You are not prolific at all- the word does not apply to polluters- you
are not a prolific polluter, Yellow Dogmanure.

As for loud mouthed white trash, check
your own history, not very flattering is it?

Thaz' your opinion, Yellow Dogmanure, but then you have demonstrated
that you are all about being a liar, isn't that right, Yellow Dogmanure
Liar, the Liar from Brazil, the Yellow Dogmanure Liar from Brazil...

 

[YD]

On Fri, 23 Jan 2004 05:07:10 GMT, Sewer Mouth Bloggs
<nospam@nospam.com> wrote:

YD wrote:
On Thu, 22 Jan 2004 04:02:30 GMT, Fred Bloggs <nospam@nospam.com
wrote:



YD wrote:

Or were you just setting yourself up
to walk all over a beginner for kicks?

Standard troll propaganda- appeal to losers like yourself with a big
inferiority complex- when in fact your real motive is to disrupt the NG
with your anti-American trash. You have nothing to contribute- you are a


Huh, where did you see anything anti-American in this?

Read it again, stupid. Nobody will be mislead by paying attention to any
particular statement in any particular post. You have made your
intentions clear with hundreds of off-topic and off-charter anti-war and
anti-American posts.

So you've counted them all. How many does it take to fill the Albert
Hall? So I'm anti-stupid, where did you get the rest from?

Speaking of off-topic and off-charter, have a look in the mirror,
baby-face.

loud mouthed ignoramus- check your posting history-under both Yellow
Dogmanure and ChaosMaster- there is absolutely nothing there besides


So you finally found something derogatory, took a long time about it
too. Besides, I have no relation to CM. Lay off that bottle for a
while, OK?

You are my hero.

*SHRUG*

superficial garbage and off topic trolling.


Proportionally I have been more on-topic than you.

That is a<*SLAM*

PPOSTFU. Hey, are you being paid for being stupid or is it just a
hobby of yours?

Not very prolific
at either, but hey, I'm busy.

You are not prolific at all- the word does not apply to polluters- you
are not a prolific polluter, Yellow Dogmanure.

But you more than make up for it, stupid. Prolific newsgroup polluter,
thy name is Motor Mouth Bloggs.

As for loud mouthed white trash, check
your own history, not very flattering is it?

Thaz' your opinion, Yellow Dogmanure, but then you have demonstrated
that you are all about being a liar, isn't that ri<*SMACK*

You have a real talent for showing the world just how stupid you are,
Freddy boy. Where have I lied? You're just sore I'm pointing out all
of your failings, makes you feel a bit suicidal, doesn't it?

- YD.
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[Wim Lewis]

In article <c133d118.0401191514.15a39a2d@posting.google.com>,
Alex Bird <alex@redbeastie.fsnet.co.uk> wrote:

I don't know how much this is legal boiler-plate, but service manuals
for laptops and the like are very clear about not getting the liquid
crystal on you if damage makes it leak out.
Another good reason not to drill holes in it!

Does anyone know what class of nastyness the LC belongs to?

This made me curious also, so I did some web searching. I didn't find much.
It's hard to winnow the search results down to just displays ... "liquid
crystal" polymers are apparently used in all sorts of things, such as
coatings, injection-molded polymers, and of course pressure- and
temperature-sensitive paints. And a lot of the chemicals used are
considered trade-secret. The most nearly informative thing I found
was this OCR of a conference summary:

http://www.jlcs.jp/main/ekisho/ekisho-4_4e.html#N-Kawanishi

By completely failing to mention the liquid crystal itself, it suggests
that it's not terribly toxic or dangerous. But who knows.

--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1

 

[Bob Myers]

"Wim Lewis" <wiml@underhill.hhhh.org> wrote in message
news:buumk6$s2e$0@216.39.137.58...

By completely failing to mention the liquid crystal itself, it suggests
that it's not terribly toxic or dangerous. But who knows.

It's not terribly toxic or dangerous, and there is VERY little of
this material in any given LC display (the thickness of the LC layer
itself is on the order of a few microns). There are literally thousands
of different materials used in LCDs, but they're pretty much all
organic compounds of moderate complexity. You'd have to pick
out one specific compound to find out much about its properties.

It's still not something you'd want to be drinking, of course...

Bob M.

 

[Daniel Rudy]

And somewhere around the time of 01/20/2004 23:37, the world stopped and
listened as Quack contributed the following to humanity:

Out of curiousity, why do you want a rod sticking out of the display???
That's the part I can't figure out...


probably to mount a camera, like this;
http://hehe.org.free.fr/mirror/

interesting for video conferencing to have the camera 'in' the screen
so you can make eye-contact.

8mm sounds about a CCD chip..

Alex.

If that's the case, then why not just put it ON the screen?

--
Daniel Rudy

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