I already have very cheap 0.5 mm think foil i put on the living room door on which i write household schedules, chores etc for that week. Good enough and makes me less dependent on technology. Having such a display always on would take lots of electricity and would be distracting, the white foil doesn't have these problems and is infinately smaller and cheaper - it just doesn't have the intelligence (you probably won't need for this particular purpose)