> I'm working on a simple project, a 3 input temp readout with a 21/2 digit=
 LCD
> output, for HVAC work.Pretty simple with 3 multiplexed 7 segment LED's. H=
owever I
> want to use the LCD so it can be battery powered. The data sheet says the=
 LCD needs
> AC input. The more I read about this the more confused I become. Do I sim=
ply reverse
> the polarity to the LCD periodically? Can I use the same multiplexed setu=
p as for
> the LED? I can't seem to find a definitive answer to this problem. It can=
't be all
> that complicated. Can it?

Microchip make several micros for driving LCD segments directly, and handle=
 all the AC drive requirements.

Check out the page at http://www.microchip.com/pagehandler/en-us/technology=
/lcd/ and click on the 'products' tab just above the picture.

I haven't checked, but suspect there will be some application notes as well=
, that would explain the principles.


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