Vivo's 'Apex' concept phone has a 'half-screen' fingerprint scanner and a retracting selfie camera

One of the biggest stories out of this year’s CES, and the recipient of our Best in Show award, was a prototype phone from Vivo that showed off the world’s first in-display fingerprint scanner. This is a method of biometric authentication that could prove to be the best of all worlds — no need for bulky screen bezels, awkward rear-mounted sensors, or complex arrays of face-detection tech. That prototype later shipped in China as the X20 Plus UD, and now Vivo has brought a conc