Vivo phone shows off first in-screen fingerprint scanner

The tech was rumored to go in the iPhone and Samsung phones, so it's kind of a big deal.

Jessica Dolcourt Senior Director, Commerce & Content Operations
Jessica Dolcourt is a passionate content strategist and veteran leader of CNET coverage. As Senior Director of Commerce & Content Operations, she leads a number of teams, including Commerce, How-To and Performance Optimization. Her CNET career began in 2006, testing desktop and mobile software for Download.com and CNET, including the first iPhone and Android apps and operating systems. She continued to review, report on and write a wide range of commentary and analysis on all things phones, with an emphasis on iPhone and Samsung. Jessica was one of the first people in the world to test, review and report on foldable phones and 5G wireless speeds. Jessica began leading CNET's How-To section for tips and FAQs in 2019, guiding coverage of topics ranging from personal finance to phones and home. She holds an MA with Distinction from the University of Warwick (UK).
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Jessica Dolcourt
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Using the world's first phone with a fingerprint scanner built into the display was as awesome as I hoped it would be.

There's no home button breaking up your screen space, and no fumbling for a reader on the phone's back. I simply pressed my index finger on the phone screen in the place where the home button would be. The screen registered my digit, then spun up a spiderweb of blue light in a pattern that instantly brings computer circuits to mind. I was in.

Such a simple, elegant harbinger of things to come: a home button that appears only when you need it and then gets out of the way. I would bet several Bitcoins that in-display fingerprint sensors become one of 2018's biggest phone trends, starting with high-end devices like the rumored Samsung Galaxy S9

This Vivo phone could launch a smartphone trend

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But the phone I held in my hands was not the Galaxy S9, which doesn't exist yet. It's a pre-production model by Chinese phonemaker Vivo, and it's still without an official name, price and sale date.

For phone enthusiasts, the real news is that this technology -- which was rumored for the Galaxy S8 and beyond, and also for the iPhone X -- isn't just a bunch of hot air. It's real, and it works.

How in-display fingerprint readers work

In fact, the fingerprint sensor -- made by sensor company Synaptics -- lives beneath the 6-inch OLED display. That's the "screen" you're actually looking at beneath the cover glass. You can see it in our photos here.


This is the sensor that makes it all possible.

John Kim/CNET

When your fingertip hits the target, the sensor array turns on the display to light your finger, and only your finger. The image of your print makes its way to an optical image sensor beneath the display. 

It's then run through an AI processor that's trained to recognize 300 different characteristics of your digit, like how close the ridges of your fingers are. It's a different kind of technology than what most readers use in today's phones. 

Synaptics, which demoed the Vivo phone in a crowded booth at the back of an interminable hallway, says that the fingerprint reader won't suck up much more battery by illuminating your finger, promising that its power management is equal to industry standards.

All the new phones at CES 2018

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Because the new technology costs more to make, it'll hit premium phones first before eventually making its way down the spectrum as the parts become more plentiful and cheaper to make.

Vivo's phone is the first one we've gotten to see with the tech in real life, but it's clear this is just the beginning. 

Watch this: See the first in-screen fingerprint scanner in action

Robots, Google Daydream and a lot of rain: Everything you need to know from Day 1 of CES.

CES 2018: CNET's complete coverage of tech's biggest show.