Hey guys,

I have a 5 volt DC circuit, with a PIC chip and want to run a small numeric LCD display. The LCD display needs 5 volts AC.

This is what I am wanting to use :: http://lumex.com/products/detail/1362

Would a simple PWM at 30 or 60 Hz work?

I have googled it and came up with nothing.

Anyone have a schematic of a circuit that I can use?

Also, does anyone have any idea what king of amperage these LCDs pull? I know it isn't very much.

Thanks!

 

These need an AC drive with a DC component of zero. You can make this in any micro by using pins to make 50% square waves.

There is one (or more) common planes, and a segment for each display element. Drives these in phase for off, out of phase for dark,

50% means 50.00000%. 49.9/50.1% will eventually destroy the liquid.

They draw minute bits of power. Ignore it. That's why cheap watches use LCD's.

 

Great info. Thanks, Ernie!