Curiously, it seems to be the backlight that's the cue for me. Anything, a phone, a laptop, a desk screen, can bring me into a distracted state very quickly. I really hope e-ink devices will give me a bit of a relief once they become affordable (which is delayed due to expensive patents, as I understand it).

I experience this when trying to read lenghty text on e-ink devices vs. a computer screen or phone. On the other hand, a kindle or remarkable don't give me as many options to distract myself so a more versatile device might still distract me even with e-ink.

Time will tell but for now it subjectively feels like the light emission (any color) has a very adverse effect on me, unless distraction is what I'm looking for :(