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?

  • pycorax@lemmy.world
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    14 days 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.

  • Voltage@sh.itjust.works
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    14 days 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.

    • Maalus@lemmy.world
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      14 days ago

      My under the screen fingerprint sensor allows me to take out my phone from my pocket already unlocked. No button presses, no fiddling with finger placement on the back, it just works and is fastest.

      • ikidd@lemmy.world
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        13 days ago

        IDK how you manage that since there’s no tactile feedback to know when your finger is in the right spot on the screen. I have to be very precise with mine so I have to look at it every time.

        • Maalus@lemmy.world
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          13 days ago

          I don’t. I just pull it out of my pocket roughly in the middle by pinching with my pointing finger and thumb. Get an unlocked phone each time I get it out.

          • ikidd@lemmy.world
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            13 days ago

            Must be a much better reader than on my Pixel6. Not very fucking impressed with that one.

    • SolOrion@sh.itjust.works
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      14 days 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.

    • thermal_shock@lemmy.world
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      14 days ago

      I’m mixed on this. I have had the S9 for 6ish years, since launch. I love that it’s on the back. except having to pick it up to unlock it lol. so 80% of the time it’s amazing, which I guess is good enough.

      also, pro tip, add multiple finger prints, both thumbs, and index, etc. so you can unlock it in multiple grips and don’t need a single finger available to get in.

  • xmunk@sh.itjust.works
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    14 days 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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      14 days 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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        14 days 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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        14 days 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 days 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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            14 days 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.

  • SatyrSack@lemmy.one
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    14 days 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.

  • Blackmist@feddit.uk
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    14 days 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.

    • Pasta Dental@sh.itjust.works
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      13 days ago

      The pixels from 6 to 8 use an optical fingerprint scanner, and optical scanners almost universally suck, because they use a tiny camera to see your finger through the display on your phone. Most phones including the pixel 9’s include an ultrasonic fingerprint scanner, which is more reliable, faster, doesn’t flashbang you in the dark, and has the potential to be much bigger (think lower half of the phone is the fingerprint scanner).

      I haven’t had trouble with under display fingerprint scanners since I had my S23 (ultrasonjc), but my previous has an optical one and it was the worst thing I’d used.

      • Blackmist@feddit.uk
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        13 days ago

        I’ve used standalone optical readers before, and the ones that worked well had a slightly tacky rubbery-plastic layer on them, that I think helps with making the fingerprint stand out. Obviously can’t do that on a screen, because it’d be weird.

    • yeehaw@lemmy.ca
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      14 days 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.

  • 🧟‍♂️ Cadaver@lemmy.world
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    14 days ago

    I think tht answer might be because of marketing.

    For me, I dislike both the ower 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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      14 days 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

      • XeroxCool@lemmy.world
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        14 days 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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          14 days 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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            14 days 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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    14 days 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.

  • Stoposto@lemmy.world
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    14 days 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.

    • BaroqueInMind@lemmy.one
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      13 days ago

      Because you could unlock anyone’s phone without their consent with just a photograph of their face and some easy to do depth trickery

    • billybong@lemmynsfw.com
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      14 days 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.

      • Stoposto@lemmy.world
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        14 days ago

        I don’t usually use my phone while it’s flat on a table, but I can say FaceID does work at an angle, because I just tap the screen and it reads my face and shows me notifications (I don’t have always on turned on and have hidden notifikation content behind the login as well)

    • cynar@lemmy.world
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      14 days 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.

      • Stoposto@lemmy.world
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        14 days ago

        Apple quickly implemented a Mask FaceID scan so you could unlock with mask, I used that or just swiped my watch for payments etc. I did see quite a few android friends go back to fingerprint I remember

        • paperplane@lemmy.world
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          13 days ago

          It took them a few years, if I remember right, though they did add the unlock-with-watch pretty early.

          • Stoposto@lemmy.world
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            13 days ago

            I looked it up and you are totally right, it was in 2022 which wouldn’t have been as fast as I remembered/wrote before!

    • xigoi@lemmy.sdf.org
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      14 days 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.

      • Stoposto@lemmy.world
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        14 days ago

        That might be an android flow, not ios. On my iPhone I pick up th phone and it turns on screens by itself and unlock instantly

    • jbk@discuss.tchncs.de
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      14 days 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

      • Stoposto@lemmy.world
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        14 days ago

        My friend got an nudged android and it seems very bad implemented where it covers content in many apps and it had no functionality like it does on iPhone. On iPhone it’s part of the notification system showing you info from other apps, for an example the timer app shows the time while cooking in nudge while I am on lemmy. Yes on a side by side screenshot it seems alot worse than using my old Motorola next to my IPhone, the “dead pixel” nudge on Android seem to annoy people alot more

    • eronth@lemmy.world
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      14 days 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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      14 days 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.

  • makyo@lemmy.world
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    14 days 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

  • not_woody_shaw@lemmy.world
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    14 days ago

    Foldables have it on the side/power button but are priced as if they had 100 ultrasonic fingerprint readers under each screen.

    • Letme@lemmy.world
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      14 days 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

      • wreckedcarzz@lemmy.world
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        14 days 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.