Dear Joe,

The Vo (wiper) pin is an input.  This DC Voltage that is applied to the
IC Chip, then converts to a voltage waveform to drive the LCD Glass.
This is technically the voltage  that controls the contrast on an LCD. 

Best Regards, 
Bill Spinney
__________________________ 

Bill Spinney 
Regional Sales Engineer 
Densitron Corporation 
Tel: (562) 941-5000 xx244 
Fax: (562) 941-5757

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