Hi "Darkness"

Any Real-Name ?

Darkness wrote:
> > I often connect the pot between -12V and +5 and the center tap to
> > "Contrast in" (Vee ?? -  I dont remember the right name at the moment )
> >
>
> are the power rails for extended temp  range lcds at 0 and 5v or 0 and a
> negative voltage?
>
> But it is not an extended temperature display, (not meant to be anyway),

Hmmm...  may also apply to extended viewing angle.

Normal supply:  VCC = +5V , GND = 0V (also with ext. temp range )
Negative supply approx -7.5 V referenced to GND
                               __
                               /
              +5V o----RRRRRRR/RRRRRRR-----o -7.5V
                             /
                             |
                             o
                  adjustable out ( +5 .. -7,5V )
                  to Contrast in.

(AFAIK):
Regarding differences between ext. temp-range and normal display the
Supply
Voltage is normaly always Vcc = +5V and GND = 0V, the only thing
what differs the voltage, required for adjusting the contrast .