How does Fingerprint Under Display work?? – OnePlus 6T
Linus Tech Tips
·Linus Tech Tips
·2019-05-06
·
955 words · ~4 min read
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display notches love them or hate them we can all agree
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that the quest to eliminate bezels and push ever closer to that mythical 100
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screen to body ratio in a smartphone is in fact stimulating a lot of innovation
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from hidden cameras that pop up when you're using them to using vibrating
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glass as your speaker but the one feature that we have in our
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hands today that seems to me at least less like a gimmick and more like the
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new paradigm moving forward is fod or
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fingerprint on display with the latest example of this technology right here on
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the 6t from oneplus so they reached out to sponsor a video
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all about this new fingerprint scanning technology and how exactly it works so
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let's unlock its secrets
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oh no that's just we're just unlocking the phone there's no secrets
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sorry wait just hold on a sec
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okay first things first definitions ever since the first fod prototypes showed up
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at ces 2018 people have erroneously been
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calling them in-screen fingerprint readers but technically speaking these
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implementations are actually under screen fingerprint readers so with an
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under screen scanner like the one in the oneplus 6t there's the glass
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then the amoled display panel then the
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fingerprint reader an in-screen reader would be a technology we don't actually
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have yet where the scanner would actually be integrated within the
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display panel which would presumably allow large areas of the screen or even
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the entire screen to read your fingerprint enabling ideas like
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multi-finger authentication or even continuous authentication where the
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device never stops reading your fingerprint throughout an entire session
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or transaction that's really fun to think about but let's bring it back to
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the present day because even this would have seemed pretty sci-fi a few short
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years ago something that's especially mind-boggling considering that oneplus
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themselves have been experimenting with this technology in their Labs since back
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in 2017 when they had actually intended
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to include it in the oneplus 5t as for
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why that never happened oneplus says the tech just wasn't ready yet the hardware
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was larger taking up precious space inside the phone and that module
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actually had to be bonded onto the screen increasing the cost and the
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complexity of repairs more importantly for the user though
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they felt that the first gen scanner just wasn't fast enough or consistent
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enough to ship with a oneplus logo attached now two phone generations later
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the 6t uses a newer smaller fingerprint
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module from goodix that oneplus says is the fastest in the industry unlocking
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the phone in just .36 seconds unlike the
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capacitive fingerprint scanners that most of us are used to the 6t uses an
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optical scanner so the phone's display is actually used to shine a light at
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your finger apparently they got the best results with green light and then the
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reflected light that reaches the fingerprint sensor creates an image of
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your fingerprints minutiae the distinctive ridges valleys and forks
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that comprise your unique fingerprint the scanned image is then compared to
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the fingerprint that was stored in your snapdragon CPU's trust zone which is
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analogous to an iphone secure enclave back when you first trained your
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fingerprint model self-learning algorithms help compare your minutia to
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the saved image more quickly and if there's a match the phone unlocks
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lickety-split and now for some rapid fire q a from
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some guy is it durable yeah it's rated for 300
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000 unlocks is that a lot though that's about like unlocking your phone
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150 times a day for five years
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what if i have a screen protector then that will not affect it at all
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okay smart guy what if i have a bunch of scratches or even a crack on my screen
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okay now we're getting into your mileage may vary territory if you have a small
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crack then it probably won't affect it
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if you have a bigger crack then it's probably a good idea to train the model
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with the crack already there and if you have a really big crack well
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then you should go to the gym well see you later
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so in summary this is something that i've been
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particularly amped about because even way back when the first phone started
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showing up with fingerprint scanners on the back i've been looking at that going wow
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i hate this i hate everything about it because i use my phone sitting on the
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desk in front of me an awful lot whether it's to browse through notifications
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swipe them away or whatever the case may be and having a fingerprint scanner on
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the front allows me to pick up my phone less which i don't know about you guys
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but for me is definitely a quality of life improvement so being able to just
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go like this go yes that's important no it's not type of dtap and be done
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huge improvement absolutely love it so thanks for watching guys thanks to
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oneplus for sponsoring this video if you guys disliked it you can hit that button
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but if you liked it hit like get subscribed or maybe consider checking out where to buy the stuff we featured
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at the link in the video description also down there is our merch store which
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has cool shirts like the one i'm wearing and our community forum which you should
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totally join did i train this finger oh i did yeah okay okay okay
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thanks some guys