Re: LCD Screens and freezing weather

On Dec 3, 12:17 pm, Richard Owlett <rowl...@xxxxxxxxxxxxx> wrote:
m...@xxxxxxxxx wrote:
On Dec 3, 10:18 am, "Fred Hiltz" <n...@xxxxxxx> wrote:

George wrote:

Can I safely keep my LCD touch screen GPS in my car in freezing
weather? I mean, after all, the "L" stands for liquid.

It is more a paste than a liquid. Of course everything freezes at
some temperature. Google "LCD storage temperature" will find you
typical ranges of -40 to +70 degrees C. Check your owner's manual.

My GPSmap 60CS specifies no storage range, but an operating range
of -15 to +70 C. I have used it as low as -25, but the screen has
almost no contrast and of course the batteries do not last long. I
keep it in an inside pocket and use an external antenna now.
--
Fred Hiltz, fhiltz at yahoo dot com

Generally when you design "personal" electronics, you design for an
environment that can be tolerated by a person. Hence the LCD getting
finicky in cold weather.
[snip a case history]

Pay attention that like humans "can survive" extremes at which the "can
not operate". Consider skater falling thru ice whose body temperature is
drastically reduced. He does not "function" at that temperature. BUT, if
carefully warmed may resume normal function.

*CAVEAT LECTOR* _ALL_ adjectives significant ;/

Consumer grade or even industrial grade electronics will degrade
specifications for items that interface with humans. Chips can easily
work at 125 deg C, but nobody designs displays to be read at those
temperatures.

The LCDs used in outdoor electronics have heaters. Even then, I doubt
they are designed to work at the lower limits of the chips (-55 deg C)

I've designed display driver chips, so I'm not pulling this stuff out
of the ether.
.

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