Do typical 44780 lcd modules have wildly varying contrast, given the same bias setting, or did i just pick a crappy
supplier ?

i have 100 20x4 LCDs, and, on the 2 or 3 samples i got, grounding the BIAS pin (3) got me about the contrast i
wanted.

i ordered 100 of them, and, on this run, i'm ending up with too much contrast.  they also have a version of this
board that anouther one of their customers uses thas a 5k resistor on board that limits contrast, but that seems to
limit it too much for my application (can hardly see the chars that way)

anyway, i just want to know if, given a static BIAs volts (say, ground) on a run of 100 LCD's, should i *expect* to
have wildy varying contrast over the 100 boards ?

thanks,

david dunn

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