I had two Samsung flagship phones, one (S20FE) had an optical fingerprint reader and the other (S22) had an ultrasonic one. Both of them somewhat regularly failed to read my finger, were slower than a fingerprint reader on the power button and are more expensive/complex to build. They won’t work with cheap 3rd party screen replacements and some screen protectors as well.

Meanwhile my $90 Android phone has a fingerprint reader on the power button. It never fails and I never have to perfectly place my finger on the sensor area to get it to work. It just seems like the perfect place to put a fingerprint sensor, so why do phone manufacturers keep using in-display fingerprint readers over the cheaper alternative?

  • Voltage@sh.itjust.works
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    3 hours ago

    Optimal fingerprint reader placement is on the back of the phone. You can just pick it up slide your finger on it and boom on to the home screen. Just want to see the time? Just press the power button and see the lockscreen.

    • SolOrion@sh.itjust.works
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      21 minutes ago

      Agreed completely. I have an S23 rn, but my previous phone was a mid-tier android with a fingerprint reader on the back. My natural resting grip on my phone would just unlock the thing. It was amazing. My current phone is a clear upgrade in every way except the fingerprint reader. My new one has it in the screen and I fuckin hate it.

    • davidagain@lemmy.world
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      2 hours ago

      I deduce that your phone never randomly locks while you’re using it as a satnav. Lucky you.

  • Blackmist@feddit.uk
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    3 hours ago

    My Pixel 7 has the fingerprint reader behind the screen and it’s awful. Unless you’ve got the greasiest fingers of anyone who ever lived, it fails to log you in.

    Instead the face recognition kicks in, and then fails when you try to make a payment, asking for your fingerprint again.

    It’s fucking aggravating.

    My crappy old Huawei thing has a separate panel for fingerprints and it never failed to work.

    • yeehaw@lemmy.ca
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      2 hours ago

      They said the same about the 6 but honestly it works pretty well for me most of the time.

      Sorry, I have God fingers I guess. blessed by the finger maiden.

  • potentiallynotfelix
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    7 hours ago

    I don’t know but I prefer fp sensors on the back of the phone because my fingerprint is also up there naturally.

    • eronth@lemmy.world
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      4 hours ago

      Yes! I’m so sad they’ve moved away from this. I could pull out my phone AND unlock it in the same grab.

    • corroded@lemmy.world
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      4 hours ago

      I can’t find a decent screen protector for my Galaxy S23, no matter how I try, and it’s all due to the damned in-display fingerprint reader. Any adhesive-style screen protector has an open area for the fingerprint reader, and it’s either a different material or a different thickness; they all look like shit. I’ve tried the screen protectors that use a UV-cured adhesive, and they’re messy, difficult to apply properly, and generally a pain in the ass.

      I’ve relegated myself to not using a screen protector at all, but considering my pocket lint scratches my screen, it sucks.

  • Stoposto@lemmy.world
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    4 hours ago

    I don’t understand why “FaceID” isn’t more of a stardard on Android. I remember people online complaining when Apple got rid of TouchID on their phones, yet anyone who use FaceID quickly forget that fingerprint skanners are a thing. It works so fast and you don’t have to complain about where a sensor might be on a device, if you can see the screen the screen the device is unlocked.

    • xigoi@lemmy.sdf.org
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      2 hours ago

      The unlocking flow is slower. With the fingerprnt scannerb I just put my finger on the screen and go. With face recognition, I have to turn on the screen, wait for it to pick me up, then swipe to unlock.

    • jbk@discuss.tchncs.de
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      2 hours ago

      Large iPhone notches are kinda ugly compared to the simpler notches in most other Android phones. Also, maybe there’s tons of patents by Apple. Could be why I don’t think I’ve ever heard of an Android phone that does more than a simple 2D facial scan with the normal camera

    • cynar@lemmy.world
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      2 hours ago

      It became a big thing on android just before covid happened. Unfortunately, masks completely confused it.

      I currently have both active on my phone, it’s about 50/50 which unlocks it first. I tend to unlock my phone as I bring it out of my pocket via fingerprint. If that fails, then face ID kicks in.

    • billybong@lemmynsfw.com
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      3 hours ago

      Not quite, you have to have the camera angled at your face. If the phone is flat on your desk it won’t unlock unless you lean right over it.

  • pycorax@lemmy.world
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    8 hours ago

    The fingerprint sensor on the power button isn’t the main reason why I got my Fold 6 but it’s such a small thing that sweetens the deal a lot. I absolutely detest screen based fingerprint readers.

  • 🧟‍♂️ Cadaver@lemmy.world
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    12 hours ago

    I think the answer might be ‘because of marketing’.

    For me, I dislike both the power button AND the screen fingerprint reader. The power button because I like to access my lockscreen and not to be catapulted in the last app I was using ; the screen reader because it’s messy and oftentimes doesn’t work correctly. My newborn has been able to unlock my phone, multiple times…

    What I really miss was the fingerprint reader on the back of the device. It was convenient, fast, precise and let me access the lock screen.

    • Nightsoul@lemmy.world
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      3 hours ago

      Why not just tap the screen of your phone to see just the lock screen? It’s especially convenient my phone is sitting on my desk, just double tap

    • Red_October@lemmy.world
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      6 hours ago

      For my part, I don’t have all of my fingers scanned into the reader (Which is on the power button), so it’s easy to just use a different finger in the event that I want to access my lock screen specifically.

      • XeroxCool@lemmy.world
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        10 hours ago

        I had a 3a and thought I loved the rear reader, but apparently I have my phone flat on a desk or in a stand often enough that I really do prefer the front reader

        • DontTreadOnBigfoot@lemmy.world
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          9 hours ago

          I can never get my 6 to read my print unless I hold it in my hand exactly right (and even then it’s hit or miss), so the stand or desk thing is irrelevant in my case.

          • RogueBanana@lemmy.zip
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            3 hours ago

            Although the pixels specifically seems to be exceptionally bad compared to others. I absolutely hate it on my pixel 7 but my mom’s nothing phone seems to be much better but still not as fast/reliable as the dedicated sensor on the back or side.

  • m-p{3}@lemmy.ca
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    12 hours ago

    I had a power button fingerprint reader in the past (Moto G7 Plus) and it wasn’t great as I’m left-handed. My thumb ends up on the opposite side of the screen, so I had to use my index which isn’t ideal.

  • TheAlbatross@lemmy.blahaj.zone
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    15 hours ago

    I miss when it was on the back, right around where you put your finger when you pick up the phone.

    The underscreen one is a major downgrade and I gotta fumble with it a few times to get it to work, usually.

    • RisingSwell@lemmy.dbzer0.com
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      8 hours ago

      My underscreen one is excellent and works 99% of the time. That still leaves it significantly worse than rear fingerprint sensor. RIP the best unlock method.

    • MeatsOfRage@lemmy.world
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      10 hours ago

      Biggest thing I miss about the old Pixels was this because you could swipe it to pull the notifications bar down. It worked system wide so you could during a game or video just pop it down to check time or settings and just flick it away without moving your hand to the top of the phone.

    • Thavron@lemmy.ca
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      14 hours ago

      Yessss. I had a Nexus 6P and the back fingerprint reader was amazing. Still probably the best phone I’ve had.

    • WR5@lemmy.world
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      13 hours ago

      I have a Google Pixel 5 and it’s in a great location for me. It’s right where my thumb generally rests.

    • Sir_Kevin@lemmy.dbzer0.com
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      15 hours ago

      This so much! And it’s eragonomic no matter which hand you use. My new phone has it on the power button and it’s just ok. I miss having a rear touch sensor.

  • foggy@lemmy.world
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    16 hours ago

    The S9 had the fingerprint reader centered on the back. It was awesome.

      • wreckedcarzz@lemmy.world
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        3 hours ago

        Nexus 6P / 5X all the way to Pixel 5 had it.

        While I miss the rear scanner, I have had no issues with the under-display type in the 6/7/8. I see people online every time this topic comes up, screaming that it’s awful, but… cannot reproduce, ticket closed.

  • SatyrSack@lemmy.one
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    14 hours ago

    Wow, that is the opposite of my experience. I have only had problems with the power button fingerprint readers. My last three phones have used in-display readers, and that has been so much more reliable for me.

    I do still use my Pixel Tablet, which uses a power button fingerprint reader for some reason, and I am constantly fighting with it.

  • xmunk@sh.itjust.works
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    17 hours ago

    Power buttons are often covered by cases and, since they’re usually a weak spot for water proofing, it’s more effective to have a case that fully covers the button. In-screen readers (like what I have on my Samsung A71) tend to be good enough most of the time.

    • sushibowl@feddit.nl
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      15 hours ago

      It really depends on the sensor tech. The fingerprint reader in my pixel 7 pro is absolute dogshit. I’ve heard the pixel 9 line improves things though.

      • halcyoncmdr@lemmy.world
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        13 hours ago

        My Pixel 6 never could read my right thumb, maybe 2% of the time. You know, the one used 99% of the time by a right handed person.

        My Pixel 9 Pro Fold with the sensor in the power button has worked 99% of the time so far with all registered fingers in all manner of grips. Almost too good honestly, since it unlocks sometimes accidentally when picking it up.

        That said, the rear sensor was still the best placement.

      • lemmyng@lemmy.ca
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        15 hours ago

        Pixel 8 user here - the in-display fingerprint reader is fine, as long as my finger isn’t super dry (which happens regularly). So I’m regularly licking my finger to unlock the device like some boomer that’s used to doing it from turning pages in a book.

      • Dave@lemmy.nz
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        14 hours ago

        I have a Pixel 7 Pro and have never had an issue. I don’t have a screen protector on, if that makes a difference.

          • Dave@lemmy.nz
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            11 hours ago

            When I got the phone I also got one of the glass screen protectors, which was advertised as being extra thin for good touch sensitivity.

            I shattered it trying to peel the plastic backing off, and never got around to getting a new one.

            That one you linked looks like it would suit someone like me a bit better.

  • makyo@lemmy.world
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    17 hours ago

    Not an expert but I’d suppose it’s nothing more than marketing getting in the way and insisting on an over engineered solution because it’s flashy

  • FurtiveFugitive@lemm.ee
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    16 hours ago

    For a while, there was a patent on it, at least in he US. I remember having to root a Sony phone to enable the fingerprint reader on the power button about 10 years ago.

    • Letme@lemmy.world
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      16 hours ago

      I have a T-Mobile Revvel as a backup, it has it on the power button. Actually a decent freebe 5G phone, no complaints