e ink

backside of mobile phone and/or tablet could have color e ink display 
so that the user could use the oled front display for normal use
and the user could flip the device and watch the backside 
to read e books and news without straining it's eyes 

backside of laptop could have color e ink display 
so that the user could use the oled front screen 
to update what's shown on the e ink back screen 
while the user is in a café, library or office 

and for social reasons 
the user could change what's shown on the e ink back screen 

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