Apple INVENTS Under-Display Touch ID System.
Apple’s patent covers optical sensing, and more precisely, under-displaying optical sensing.
If an optical sensor is located under a light-emitting monitor, there is no need to reserve a portion of the monitor surface of the device for the optical sensor, and the display size of the device can be increased.
The sensor(s) may include a heat sensor, a location sensor, a light or optical sensor, an accelerometer, a pressure transducer, a gyroscope, a magnetometer, and so on.
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Content retrieved from: https://www.patentlyapple.com/patently-apple/2020/07/apple-invents-under-display-sensors-that-could-one-day-eliminate-the-iphone-notch.html.