Sony tipped to be considering an "all e-ink" smartwatch

Smartwatches might be useful, at least to some, but their battery lives are nothing to write home about, given the available space you can cram a battery into. Some smartwatch makes, most notably Pebble, have opted to stay with the colorless but more power-efficient e-ink types of display. Based on an insider source, Sony might be eying something similar too, …