There's a new concept mobile phone called 'second-life' that uses a 'double-display' which is an OLED display on top of an E Ink display, and both are transparent. You can switch between the displays: so when power is low, you can use the E Ink to conserve battery. A nice touch is that if you're using the E Ink display, the degree of transparency of the display shows how much battery is remaining. The more transparent the display, the less battery remaining.
We're not sure if it's possible to create a transparent E Ink... but this concept design is nice in any case...
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Posted: Nov 18,2010 by Ron Mertens
