Electronic Ink Promises To Save A Tree

“E Ink’s displays feature a layer of electrophoretic liquid sandwiched between a pair of flexible electrodes. Millions of microcapsules, containing a mixture of dye and pigment, are suspended in the liquid. Driven by a thin-film transistor (TFT) array, the light or dark appearance of each pixel can be switched by altering the polarity of the electrode. Electronic paper gets high resolution.

Source: Optics.org

An electronic book would have to be easy to read and at 160 pixels per inch, this technology should be a better experience than reading from a 72 pixel per inch monitor?