Vanillalite
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https://9to5mac.com/2017/05/26/iphone-8-touch-id-in-screen/amp/
A new report from Economic Daily News, via Digitimes, indicates that the iPhone 8 will use a new optical fingerprint sensor technology to enable users to place their fingers directly on the OLED display and have the phone scan the print, as an elegant replacement for the existing Touch ID home button.
The screen ratio will change from 16:9 on iPhone 7 to 18.5:9 (corroborating many other sources) and invisible Infrared sensors will unlock enhanced camera and augmented reality features. Apparently, TSMC discussed these upcoming flagship iPhone features at a Taipei symposium.
This latest report from Economic Daily News suggests that the most elegant solution is what Apple is going with. With a virtual home button drawn on the display, users would simply place their fingers on the screen and the optical scanner would authenticate the fingerprint.