Always On Display demo on the Samsung Galaxy S7 and Galaxy S7 edge

On the outside, the Samsung Galaxy S7 and Galaxy S7 edge look familiar. The two aren't very different from last year's Galaxy S6 and Galaxy S6 edge+, at least not when it comes to design. But under the hood, you get a ton of new goodies, including a faster processor and a better camera. And on the software side of things, the S7 and S7 edge have gained a few neat abilities. One of them is called Always On Display.
Now, you're probably thinking that having the screen lit at all times will drain the Galaxy S7 battery faster. And while you won't be wrong to say that, we must point out that an AMOLED screen's pixels draw power only if they're not showing black. That's why Always On Display uses black backgrounds, thus consuming minimum amounts of power. As a matter of fact, the feature could improve battery life, as you won't have to turn on the whole display anymore just to see the time. But you may disable Always On Display if you really want to.
UPDATE: To clarify, widgets and images shown by the Always On Display have their location changed every once in a while. This is to avoid screen burn-in – a degradation of the screen caused by displaying a static image for long periods of time.