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).


-Adam

Mike Mansheim wrote:

>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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