[sdflhasjd]

This is how I've done it with some of my eink projects.

The downside is that powering down loses the display buffer needed to correctly do partial updates, do you have to refresh the display every time - which is actually very distracting if it's sitting on your desk.

[OJFord]

Is that built in to the display unit? It can't be loaded (from your own non-volatile(/battery or cap backed) memory) prior to triggering display update? (I've never used one.)