Most e ink doesn't use a true backlight, but an array of lights along the inside of the bezel that light up the screen reflectively. It's still very good for ba

Most e ink doesn't use a true backlight, but an array of lights along the inside of the bezel that light up the screen reflectively. It's still very good for battery life. Both the kindle Paperwhite and the onyx tablets have this feature. Onyx even let's you tune the warmth of the light.