What do cell phones look like in the year 2144?
Obviously they won't have a screen anymore. They'll be pop-up displays. So if you're sitting on a train and your romantic partner sends you a steamy selfie...guess who has an audience?
Has this annoyed anyone else?
If they're tactical screens, that makes sense. But I still don't think transparent displays on personal devices will be a thing in the future.
It's far more likely it's displayed directly into your brain.
I mean, we're talking about 121 years from now - enough time to go from the telegraph to VR multiplayer games played by people from 5 continents over a worldwide network: it kinda seems logical that some kind of direct brain interface tech (for which there are already some very early stage things) will have been developed by them.