The Motorola rizr is a new prototype for a possible future Android smartphone that has a display that can roll up from the back and bottom to extend the phone's vertical screen size.
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Rollable phone RSS
TCL's latest concept seems to take a bit of everything of what we've seen from transforming displays and put it all in one package. However, it's still unclear when or if it will make such a device.
LG is planning to release its first phone with a rolling screen at some point this year. The company briefly teased the device during its CES presentation this year, and it seems to be real.