I am surprised no one has mentioned E Ink phones. My daily driver is an E Ink Hisense A5 phone that is modified to run Google Play. It can run all Android apps without any major issues.
The E Ink display has two advantages over LCD: it consumes very little power and it looks great under bright sunshine. I also get less eyestrain reading eBooks and RSS on the matte E Ink display.
I love E Ink so much I doubt I am ever going back to LCD, but the E Ink display is not perfect: it is black and white (there is a color version but it is very grainy), and the E Ink display is also less responsive than an LCD.
The E Ink display has two advantages over LCD: it consumes very little power and it looks great under bright sunshine. I also get less eyestrain reading eBooks and RSS on the matte E Ink display.
I love E Ink so much I doubt I am ever going back to LCD, but the E Ink display is not perfect: it is black and white (there is a color version but it is very grainy), and the E Ink display is also less responsive than an LCD.