You can't compare the contrast of an emissive (backlit LCD/OLED) and a reflective (eInk) display.
Put your OLED display in direct sunlight on a bright summer day and you will get effectively get no contrast at all, the screen will reflect so much sunlight that your puny LEDs won't do much of a difference. Backlit LCDs will get some weak contrast because the backpanel is a bit reflective, but eInk displays will always be 10:1 because they use ambiant light instead of competing with it.
These ridiculously high contrast ratios of OLED displays only take into account emitted light and only make sense in a dark room, or VR headset.
10:1 is nevertheless quite low. Black is really dark grey, and white is light grey. Having bad eyesight, I find e-ink displays too straining to use in most lighting conditions.
It’s certainly not, not even close. Try this: set your brightness to maximum, put it in the direction of the sun and use another device to take a photo of them both.
