OLED displays are known for turning off black pixels completely, thus the more black on them the less power they use. Are there any similar tricks that can be applied to the transflective "always-on" displays that Garmin uses? Do black, white or color pixels draw the same amount of power? Does a monochromatic watch face use less power than one with a bunch of colors on it?
I've never seen or heard of a case where color choice makes any difference on battery with this type of display. A difference that does come into play is how much you are displaying but that has more to do with the code being executed when generating the data for display. Bear in mind that at most times, the display only updates every minute. And with layouts, the screen is always cleared as paty of View.onUpdate().
An area where you want to be caseful is with 1hz and using the proper clip region when using onPartialUpdate(), as you have a power budget for that (a max of an avg of 30ms per call over a minute), but that has to do with the correct clip region (or multiple regions and how they relate) and not colors.
