>However, for outdoors use the only contrast that matters is relation to the real world, aka physical reality.
For you perhaps. I, for one, use screens to get information encoded in symbols and graphs, if all these symbols and graphs had no contrast with background I would not be able to distinguish them from the background. You seem to only care to compare the screen's brightness to the real world, perhaps losing your screen and then finding it in the real world, aka reality, is the main usage mode for you?
> But even so, eInk and paper has better contrast in real life outdoors use
You need to give a citation for this which would be pretty hard since we are already discussing a 12:1 device as shown by the spec sheet I've posted earlier. Or are you using "contrast" do describe brightness? In this case I agree - eInk's "black" is just a darker shade of gray so it reflects more light i.e. contributes to higher albedo. It's not great when you are trying to read from that screen but if you are just looking for the lost screen in the wilderness it won't hurt I guess.
You seem to be unfamiliar with bike computers but appear to be using your imagination instead of looking it up so I will state for the record - bike computers are affixed to bikes, a rider checks the computer during the ride and it's always in the same position, bike computers are not thrown into the wilderness to be searched for afterwards so locating one in the real world is rarely a problem facing a bike computer user. If one is detached in a crash, they always have radio and often speakers for more reliable mode of finding than the light reflected from the screen.
For you perhaps. I, for one, use screens to get information encoded in symbols and graphs, if all these symbols and graphs had no contrast with background I would not be able to distinguish them from the background. You seem to only care to compare the screen's brightness to the real world, perhaps losing your screen and then finding it in the real world, aka reality, is the main usage mode for you?
> But even so, eInk and paper has better contrast in real life outdoors use
You need to give a citation for this which would be pretty hard since we are already discussing a 12:1 device as shown by the spec sheet I've posted earlier. Or are you using "contrast" do describe brightness? In this case I agree - eInk's "black" is just a darker shade of gray so it reflects more light i.e. contributes to higher albedo. It's not great when you are trying to read from that screen but if you are just looking for the lost screen in the wilderness it won't hurt I guess.
You seem to be unfamiliar with bike computers but appear to be using your imagination instead of looking it up so I will state for the record - bike computers are affixed to bikes, a rider checks the computer during the ride and it's always in the same position, bike computers are not thrown into the wilderness to be searched for afterwards so locating one in the real world is rarely a problem facing a bike computer user. If one is detached in a crash, they always have radio and often speakers for more reliable mode of finding than the light reflected from the screen.