TI-H: Backlight

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TI-H: Backlight

Your e-mail has reached it's quota??? I couldn't send it, so I'm sending 
it to the list.

Larry, Hope you get this.

Hi!

I want to post it, but time and work have prevented me from even 
updating the battery expander page. I took a Sharp LM64P something 
backlit monochrome LCD apart. It is 640x480 pixsels, and the 
diffratction panel is really good. Lights the whole screen if cut right! 
I don't guarantee your screen will work WELL with it, but I do guarantee 
it will light it up. The screen lights fine. The problem comes in with 
some newer screens (maybe it's newer screens, but I'm not sure). The 
problem is that to properly install the backlight, you need to cut the 
rubber that holds the screen off and then peel the mirror off. You put 
the mirror on the back (rough) side of the difractor and put a diffuser 
on top, then the LCD. The problem is that some screens use the mirror 
and polarizer at a different angle, and it isn't compatible with the 
diffuser. It dimms the pixels and darkens the background. It isn't bad 
on some calcs, but it gets fairly annoying on others. Austin butler had 
a "dim" calc, but he got it and said it took a while to get used to, but 
that it wasn't too bad. All I can say is you can try. The problem is it 
it is a dim one and you decide not to do it, it is nearly impossible to 
put the mirror back on without looking VERY strange. It will have air 
bubles and dust, no mater how you replace it. If you like you can try 
with just the corner, but my experience shows that if the mirror is a 
piece of thick plastic and the one that doesn't work as well (It works, 
just dimmer pixels when the light is off) is a very flexible piece of 
plastic foil. You'll know by pulling the corner off. If it is thick, go 
for it. if it is thin, you may want to think about it. Try it if you get 
a panel. I charge $40 for the whole job (it has to cover the cost of the 
LCD panel I took apart). I got it from ALL electronics, but they 
nolonger sell it, so it is kindof my last priority. I have enough for 4 
calcs, and will need 2 or three for myself, so you, austin, and I could 
end up being the only person with these backlights unless someone had 
the misfortune of ordering the wrong LCD or thinking they could use it, 
but couldn't. I was on an LCD list before, so maybe I can purchase some. 
It would be best to find a black ON white backlit screen. It would look 
better, but I havn't found one yet.

If you want it done, I can do it for you. I could send the piece (fit it 
to my 82 first) but It is difficult and requires patience. I have taken 
over half an hour just cutting the screen off, cause you obviously can't 
crack it, and you can't cut those plastic ribbon wires. Tell me what you 
want to do. I'll do my TI-82 before I do your TI-82, just to see if it 
works well!

Respond soon!

Richard Piotter

E-Mail:
richfiles1@hotmail.com
richfiles@usa.net

The Richfiles:
<A 
HREF="http://www.geocities.com/SiliconValley/Lakes/5081/Richfiles.html">The 
Richfiles TI Page</A>
<A HREF="http://www.geocities.com/Area51/Lair/8510/Richfiles.html">The 
Richfiles Model Building Page</A>

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