>Phones - at least the mainstream smartphones - are shining light directly at you every time you look at them. There is light coming directly from the book int

>Phones - at least the mainstream smartphones - are shining light directly at you every time you look at them. There is light coming directly from the book into your eyes when you read a paper book, too. Since human vision is complicated and I'm not an expert on all the complications, I'm not going to say there are no visual advantages to an e-ink display, but "in a smartphone, the light shines directly at you" is emphatically not a satisfactory technical explanation of why an e-ink display is easier on your eyes. Also I own an early model of the Kindle Paperwhite, which of course has an e-ink display, and I don't notice any visual advantages. Also: my Paperwhite's backlight cannot be turned off while the user is using it to read, and it has a "diffuser" to spread the light evenly around the screen just like a backlit LCD display does. I.e., it is shining light directly in my eyes whenever I am using it using exactly the same components that a smartphone with an LCD display does, namely LED lights positioned at the edges of a diffuser. Is the product described by the OP actually different in this regard? I'm not sure, but the OP does discuss the product's backlight. Sorry if this comment sounds a little angry, but this non-explanatory explanation you've made and that I've quoted has been repeated many times over the years on this site.