Read on your tab with minimal eye-strain
As mentioned in the article alongside, tablets can be notoriously harsh on your eyes. A trick that works best with AMOLED (Walton Primo X1, Samsung Galaxy S and Note Series) displays is to turn down the brightness to its lowest, the background black and the text a dark shade of grey. Make sure that the font is legible enough for you, don't push the shade of grey too far. Now with grey text on a black background, it'll be much easier to read books as opposed to the harsh glare of black on white.