"Typically, the energy required for a full switch on an E Ink display is about 4mJ/cm2. The corresponding number for the Rdot display is about 1mJ/cm2 with the addition of 0,25mJ/cm2 every 15 minutes. LCD continuously consumes about 6µW/cm2."<p>This is some interesting numbers. So, for a 1 cm^2 screen, LCD consumes 6mJ for every 1000 seconds - i.e. just over 15 minutes. But to redraw the screen on eInk takes 4mJ. So if you do something that would cause the screen to fully redraw more than twice every 15 minutes, then eInk actually consumes more power? But wouldn't that generally be the case while reading?