Face ID and TrueDepth

WHEN APPLE DESIGNED the iPhone X to be ‘all screen’, it created a couple of conundrums. There had to be somewhere to put the front–facing camera, so the notch was born. (Apple is one of several companies that have applied for patents on ways for cameras to shoot through or between pixels, so a truly all–screen phone should be possible one day.)

Meanwhile, the Home button had to be sacrificed, and with it Touch ID. Apple could simply have put the fingerprint sensor somewhere else, but instead it switched to a new method of biometric authentication using a sensor