I have an old kobo e-reader that's been in flight mode since day 1. It's amazing the difference I feel between reading on a tablet and an ereader. The ereader doesn't really feel like a "device," more like a book. On a tablet, I'm googling (Can you really ride from Winterfell to Kings Landing in a week? How fast do ravens fly? Lets see what the internet thinks.). They might be related to the book. They might not. Ema…
I noticed that reading on a tablet with reverse colors (black background) has some of the same effect as e-ink. Since I started doing this I feel it is much easier to concentrate on the book. It is probably the fact that you're less exposed to light, even though you never get a completely black screen on a tablet.
An OLED screen would be a truer black, since the pixels are turned on/off individually, with no backlight. The new Dell "world's thinnest" 8" tablet with 350 PPI OLED for $399 looks promising, http://www.androidcentral.com/dell-venue-8-7840-qhd-display-...