You have probably experienced bad home LED-lights. Those with a blueish cold eye straining color. Therefor I wonder if you can add optimized LED back light that would produce a text on screen experience that is pleasant to look at. The back light does not need to produce light that shows the correct colors. Here the important thing is not put strain on the eyes when reading so maybe it can be a shade of a single color or a warm light. The idea is then to toggle to this mode if you are planning to read a longer period of time on your tablet or feel a strain on your the eyes.