The schematic used is determined by the software, not the display. The most common schematic is shown below. Please determine which software you are going to use, then see what schematic it recommends.
Both of these use this common schematic, less Rlimit:
We do not recommend using a potentiometer alone for the backlight. It is too easy to ruin the backlight by turning the pot too far. You should calculate the limiting resistor as described in this post to limit the maximum current (and set the maximum brightness) and then put that in series with a pot if you want to dim the backlight.