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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