Rolf wrote :

> Basically, the contrast voltage is "guaranteed" to be 
> between the Vss and Vdd, and so is Vref, so can I use the resistor 
> ladder in the PIC to set the Vref (and allow it to be changed 
> dynamically when the LCD is in sub-zero temps for e.g. ....).

Doesn't "extended temp range" LCDs normaly have a
neg voltage contrast adj. ?


Jan-Erik.



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