scottyhazzard I took a glance at the manual for that display. The tricky bit is that it wants two fairly different supply voltages. The good news is that it has an internal (boost) PSU for the higher voltage. The bad news is that the overlap between supply voltages is still very minimal, even taking advantage of that boost PSU. I think it’s possible that a simple 3.3v regulator such as the MIC5235 Microa mentions here could power the whole thing. It is a small component and requires one capacitor. The display itself requires 6 capacitors and 1 resistor when powered in this way. All in all I think it’s possible to add this stuff to a very small PCB or even onto an existing driver if there is a little bit of space. Any application that can accommodate a display of this size certainly has enough space. Even if running both VDDB and VDD off of 3.3v doesn’t cut it we could easily drive VDDB on one 3.5-4.0v MIC5235 and VDD on a nice comfortable 2.8v MIC4235. That’s still only 2 small components and 2 small capacitors. Bottom line is that there is no need for a bulky BEC (and the other bottom line is that needing 2 input voltages makes the BEC a less desirable route anyway).
EDIT: the display has a ribbon cable that requires soldering directly to a PCB. Rather than waste space why not just make that the PSU board and driver PCB as well?