What's the little black dot next to the iPhone camera?

The black dot next to Apple's iPhone camera is a black sensor.

It is only used to detect whether the display screen should be automatically turned off when the user answers the phone, not to detect darkness. In fact, the function of automatic dimming is the responsibility of the special chip in the front lens of iPhone, so some people have the illusion that the front lens is responsible.

IPod touch5 has no automatic dimming function because it has no iPhone sensor. Because there is no sensor, people often mistakenly think that sensors are used to control darkness.