What is Touch ID and how does Touch ID work?
The Touch ID technology found in the iPhone 5s combines an integrated image scanner with the Home Button. Although it’s not quite a camera, it does scan an image of your finger or thumb.
“The technology within Touch ID is some of the most advanced hardware and software we've put in any device.” says Apple, “To fit within the Home button, the Touch ID sensor is only 170 microns thin, not much thicker than a human hair. This high-resolution 500 ppi sensor can read extremely fine details of your fingerprint. The button itself is made from sapphire crystal - one of the clearest, hardest materials available. This protects the sensor and acts as a lens to precisely focus it on your finger.”
The result of all this technology is a Home Button that is capable of reading your finger in any orientation, and uses that degree of image recognition to unlock your phone.
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