I am trying to set up my new LCD display, that has a HD44780 driver. I was looking at the liquid crystal tutorial code on Arduino and came across a question. Do I have to have the potentiometer or can I just use a resistor? My understanding is that the 10k Pot is simply for adjusting the contrast of the display. I have ordered pots, but they won't be here for about a week. In the meantime can I simply use a resistor or do I even need a resistor to have the screen work?