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You can diy your lcd as you have started. There is no difference between
large and small lcd driving except the small ones often require less
voltage. If you push the voltage too high then the device will get extra
strongly polarised and take too long to depolarise. If you put in even
more voltage they will start electrolyzing the electrodes and self
destruct within weeks even without dc potential. A rule of thumb would be
to use the lowest voltage that gives maximum contrast (without exceeding
manufacturer limits). F.ex.  lcds used in wristwatches and cheap
calculators are saturated at Vcell ~= 1 volt and running them off 5Vpkpk
will cause the effect that you see. You can reduce the supply voltage or
use a capacitive divider on the backplane drive.

Peter

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