RE: TI-H: EL thoughts

To: "'ti-hardware@lists.ticalc.org'" <ti-hardware@lists.ticalc.org>
Subject: RE: TI-H: EL thoughts
From: Josh Collins <phroge@mindspring.com>
Date: Sun, 12 Oct 1997 15:36:47 -0400
Reply-To: ti-hardware@lists.ticalc.org
has anyone successfully made an EL panel that works?

"If I could be one thing in the world, I would be a tear born in your eye, living on your cheek, and dying on your lips" - Josh Collins

-----Original Message-----
From:	Christopher Lambert [SMTP:clambert@sparcy.geneva.edu]
Sent:	Saturday, October 11, 1997 5:49 PM
To:	ti-hardware@lists.ticalc.org
Subject:	RE: TI-H: EL thoughts



Sorry this is a bit late, I have not been on the list in several days...

On Sun, 5 Oct 1997, Jan Zumwalt wrote:

> While well meaning, I believe your friend is a bit incorrect. A 
> LCD works by reflecting most of the time. When you see a letter, 
> the crystal molecules are twisted by a charge in such a manner 
> as the light is ABSORBED BY A DARK BACKGROUND.

The background IS reflective, not dark.  When there is no charce in the 
liquid crystal, then it twists the light.  When there is a charge, then 
the light is not twisted.

---------------------   <-----  vertical polarized filter
888888888888888888888   <-----	Liquid crystal
---------------------   <-----	horizontal polarized filter
+++++++++++++++++++++	<-----	reflective surface

If the reflectife surface is removed, then you would be able to see
through the display (a clear LCD, cool...).  All charactes and numbers
could be seen fine.  A EL panel could be placed here with no problem. 
 
> On Sunday, October 05, 1997 2:47 PM, xenocide@erols.com 
> [SMTP:xenocide@erols.com] wrote:
> > I was recently talking to a friend at Denny's about 
> Backlitting
> > a TI,
> > and he suggested that an EL panel or LED array could
> > theoreticly be
> > placed behind the LCD display, due to the fact that LCD
> > displays are
> > just clear glass or plastic over a transparent liquid cristal
> > layer. the
> > only problem is to remove or at least pull the backing of the
> > LCD pannel
> > away far enough to place the EL panel or LED aray behind the
> > liquid
> > cristal layer.
> 
> 

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