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'[OT]: LCD's at high temperature'
2001\07\19@185143 by Mike Mansheim

I'll check with an LCD manufacturer tomorrow, but I thought I would ask
as long as I'm sitting here now.
We are using an LCD that is rated up to 60 deg C operating temp.  As
it happens, our application is causing those displays to occasionally
get up to that temp, and they do act up a bit - the segments get darker,
which makes the display hard to read.  We can probably live with this
if the displays are not being damaged when this occurs.
So my question is:  are the LCD's always ok when they cool down, or does
this stress them so that they won't last as long?  The 'storage temp'
rating - 85 deg C - is not exceeded.  In fact, they don't seem to get
much above 60 so far.
Thanks for any help.

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2001\07\20@004509 by M. Adam Davis

The LCDs are fine as long as you keep them within the operating
temperature range.  Adjusting the contrast will keep them from darkening
(ie, the contrast for good display at a high temp. is different thatn
the contrast at room and low temperatures.)

Some manufacturers use thermisters or put the contrast under uC control
and change the contrast according to temperature (such as in gas pumps).


Mike Mansheim wrote:

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2001\07\20@014814 by Simon-Thijs=20de=20Feber?=


This is not entirely true Adam.
I have done extensive reliability tests on LCD.
It is quite normal that the BACKGROUND turns darker.
By adjusting the contrast voltage you can achieve a
little or worsen it more.

Normal LCD's are tested within their operating
temperature by the manufacturer on sample basis.
In 3 weeks they change all environmental settings.
for example : In Cycles of 20 minutes they go from -25
to +85 with humidity of 50%.

It is not in your mail wat kind of LCD's you have, but
LCD with the LCD driver on the glass will suffer more.

Normal LCD suffer also. When the condictive material
is not isolated and will therefor oxidate.

Do not be alarmed with tha above.
In this environment I would choose an other type of



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