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KGI: iPhone 8 may supplant Touch ID with optical fingerprint & facial recognition sensors
iPhone 8 is widely expected to become Apple's first full-face handset as the company is rumored to have devised ways of integrating Touch ID into the display assembly. A research note by KGI Securities analyst Ming-Chi Kuo, a copy of which was obtained by MacRumors, claims iPhone 8 may sport a new biometric identification technology that would supplant the good ol' Touch ID system and make possible iPhone 8's rumored zero-bezel design.
As Kuo explains, because Touch ID uses a capacitive sensor located under the Home button's sapphire-coated cover glass a new solution is required to realize a bezel-less iPhone appearance. And while Apple supplier LG Innotek showed off a fingerprint sensor embedded beneath a smartphone display, engineering an edge-to-edge iPhone would require putting a Touch ID-like system underneath the display panel.
The problem is, Touch ID's capacitive sensor does not work through the display's cover glass. Hence, the need arises for a new solution that uses an optical sensor which doesn't require physical contact with a user's finger.
Here's an excerpt from Kuo's note: