One thing that needs to be considered with something like this is what it’s going to be doing at night. The display can’t stay on all night on full brightness for people who can’t sleep in a lit room. There’s also the fact that it wastes electricity.
I wanted to do PWM control of the display, but because of how the addressing system works this isn’t easy. You can, however, do PWM when there’s only one column on.
When the display is in its standby state, it will show the time, vertically, on one of the middle columns. The rotary encoder controls the brightness of the display. Pressing the rotary encoder could perhaps temporarily enable the screen so you can see all the details for as long as its pressed down.