On Sun, 11 Aug 2002, Pic Dude wrote:

>There was a post yesterday about "leaking" LCD's, and I just
>remembered this...  Had a Sony CD walkman many years
>ago (one of the first very slim units) that had an LCD display.
>
>Left it on the car dash once and when I came back, the unit
>was really hot, and the display was completely black.  I tried
>some buttons, etc and nothing.  Thought it was hosed, but it
>came back after it cooled off.  And this happened many times
>since that, but it never did any permanent damage to the
>LCD.

The malfunction and the blackness are different items. The blackness is
caused by the LC material being pushed beyond the temperature where it can
be a 'crystal'. This will turn on all segments and more (if the liquid is
not constrained in cavities). The heat can make normal circuits refuse to
work.

Peter

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