Earlier quoted context omitted.
Reflective LCDs are useless in the dark.
Are they ? I tried to find some information on scotopic visual acuity, but nothing solid... Otherwise, transflective LCDs with red backlight (rods aren't sensitive to red light).
For information more detailed than can be delivered by ambient channels, of course, you need to get it some other way. But audio will often be better than needing to focus on a little display, even if with red backlight.