If they can't put it in the display I'm all for it on the back like the pixel and likely the S8. But put it in the top corner opposite the camera. That is a more natural spot to reach than the middle.
They CAN put it on the display. That is precisely the point.
I called this months ago when the first rumors of a chinless iPhone appeared.
The tech is that you send an ultrasonic wave across the glass screen and see how it is scattered by the finger; the scattering encodes the fingerprint.
The different companies/issues being referenced all refer to different parts of this solution. You need ultrasonic signal generator and detector, you need an algorithm for extracting the fingerprint info from the scattering data, and you need an implementation of that algorithm in silicon.
BTW QC has similar technology which is implemented in some shipping Snapdragons today. However I am aware of no phone that actually uses it. I'm not sure why this should be --- maybe the details of how to integrate the ultrasonics into the display (which presumably QC has no control over) are non-trivial and no Android manufacturer has so far been willing to spend the NRE to get that suitable for manufacturing?
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Nice to see the Veblen good experiment works
Rather than being so snooty, perhaps you can enlighten us as to why APPLE manages to create a stream of (according to you) Veblen goods [iPod, then iPhone, then iPad, then aWatch, soon AirPods] while other companies (Samsung phones, Google phones, Microsoft phones then Surface pad+book+studio) seem unable to do so...
Slapping a label on something (regardless of whether that label is accurate or not) does not EXPLAIN anything. I do not understand how opium works on being told that it possesses dormitive properties. Moliere understood this 350 years ago; I expect Veblen would likewise have understood it.