LCD Problems (Was In praise of SMA) [RE-wrenches]

[jberdner at sma-america.com]

John:

Yes, temperature extremes are still an issue for LCD's.
We use displays with wide temp specs and play some games to make them
less sensitive by adjusting the contrast ratio based on inverter
temperature.
This could be the issue (direct sun and high temperatures) but the issue
seems to go away after the display is replaced so it is still somewhat
of a mystery.
Thanks much for the input it is appreciated. 

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
12438 Loma Rica Drive, Unit C
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax) 


-----Original Message-----
From: John Raynes [mailto:john at raynes.com] 
Sent: Wednesday, January 22, 2003 4:54 PM
To: RE-wrenches at topica.com
Subject: LCD Problems (Was In praise of SMA) [RE-wrenches]

Over the years I've observed that a lot of LCD displays seem to "die" at

hot or cold temperature extremes, or in direct sunlight, only to return
to 
normal once the extreme condition was removed.

I don't know if some LCD's are rated for better performance over wider 
temperature ranges than the others, but I bet that's the case.  The
problem 
case I remember the best was with an old Keithley 130 handheld
multimeter, 
vintage 1980.  Everytime I took that sucker out in direct sun, I'd lose
the 
display in a matter of minutes.  Don't recall myself (or any other 
wrenches) complaining about DMM displays that fritz, so I guess you can
do 
better these days.

Just an observation..

John Raynes
RE Solar
Logan, UT

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