> Am I missing something here? Please tell me when and if there ever is a
> need to adjust the VEE line voltage.

I use a _graphics_ display with VEE bias voltage. My experience is that for stil
l
images, there is no need to provide a negative bias.  When graphics changes, the
old image fades away slowly for the new one to settle.

In my project I have fancy graphic effects like scrollers and animations on the
screen, which look very smeary and blurred when no negative VEE bias is provided
.
Therefore I had to add the negative voltage. The visual quality of the moving
graphics is a lot better now.  However, it still varies quite a bit with viewing
angle and temperature. Actually I plan to twiddle the VEE voltage a little after
2 minutes of ontime to roughly compensate for the higher temperature.