This app was mentioned in 9 comments, with an average of 2.11 upvotes
It's an issue with AMOLED screens, especially those like ours with onscreen buttons, because like you said... those pixels pretty much never change. Calling it burn-in is kind of a misnomer because it's really the exact opposite. Those pixels, as pure black, are just completely unused compared to the rest of the screen.
A utility I've started to use recently is Immersive Full Screen Mode. It's not a great solution to keep always-on because by hiding the nav bar, it also stops the keyboard from working, but otherwise it works fine and doesn't need root. Also, since my Moto X effectively functions as my car GPS, I can turn on Immersive Mode while in Waze (it freaks out with Google Maps) and thereby have both the nav bar and status bar disappear and the Waze Maps in full screen for hours at a time. I'm hoping this will even out the pixel damage.
I have a Moto Z Play Droid and I adore it. I had a Galaxy S6 before this so the first thing I did was find a way to disable the navigation bar.
I use Fingerprint Quick Action and Immersive Full-Screen Mode to accomplish this. The first lets me use the fingerprint scanner to issue back and home commands and the second hides the navigation bar. I use Immersive Full-Screen Mode instead of a free alternative because it temporarily disables immersive mode when it detects the back command as a workaround for a security feature where the back command won't work with an (immersive mode) overlay open.
It took me a while to find the perfect apps for my average use so I hope this helps someone. You still need to exit immersive mode when using the keyboard unfortunately.
I probably copied something wrong. Here it goes again:
https://play.google.com/store/apps/details?id=be.ppareit.immersivemode
Edit: the first link is OK, not sure what is going on. Maybe not available in the US? Try searching for it directly.
Funny you just posted this, as I've been wondering the same thing for a long time. To my amazement, I think I've found the answer:
Immersive Full Screen Mode (https://play.google.com/store/apps/details?id=be.ppareit.immersivemode)
It seems like it'd be like any other app that gives you an immersion toggle, but to my absolute shock, my Pie Control back button works with it! I can be in immersion mode, hit the Pie Control back button, and I seem to be taken out of immersion mode automatically for a moment, go back, and then put back into immersion mode automatically. So I don't have to disable/re-enable immersion mode to get back to work.
Another nice benefit: you can make some apps automatically not be in immersion mode - handy for when you know you'll need the keyboard, like for texting.
I can't believe this works - try it and see how it works for you. I have a Nexus 5x with Marshmallow, no root, in case that matters. And just to be clear, I have no affiliation with the app developer.
As you might expect, this app doesn't play nice with other immersion toggles. So I removed the Power Toggles immersion mode button I was using, for example.
Any phone with an OLED screen is vulnerable to burn-in. "Burn-in" is caused by uneven use of the screen's pixels. For instance, most people get "burn-in" on the nav and notification bars, because those are consistently visible, but, because they're black, they aren't using the those pixels. Over time, the more used pixels fade more quickly than the less used pixels (in the nav and status bars), so, then, when you're using the whole screen, say, to watch a video, you may begin to notice a luminance discrepancy where the nav and status bars would normally be.
The way to avoid this is to limit uneven screen usage; namely, to use Immersive Mode when you can and avoid themes/UIs that brightly illuminate one part of the screen, but remain very dim, or black, on other parts over prolonged periods.
For example, I use Press for reading my RSS feeds, which, outside of just being a great app, offers the option for Immersive Mode. This means there are no static elements (ahem, status and nav bars), sitting there, "burning in" to my screen while I'm sitting there reading.
On other apps that I spend a lot of time on, like Reddit News and Instagram, which DON'T offer a native, Immersive Mode, I use this Immersive Mode app, which forces Immersive Mode on apps where the developer has not provided the option natively. It's not a perfect solution, as it can make the keyboard finicky, and any constantly updating notifications (e.g. downloads) will make your app dip in and out of Immersive Mode (if you have it enabled), which is annoying, but since I mostly just browse those apps and rarely run into constantly-updating notifications while using them, I find it to be a worthwhile trade-off. I also use it on games that don't have Immersive Mode, but most games these days do.
Additionally, I try to avoid leaving my screen on when running Navigation in the car, unless I don't want to listen to voice directions or there's a series of turns coming up.
Oh, and keeping your screen brightness down will go a long way too. I keep mine on auto-brightness.
So far, these tactics seem to have staved off severe screen burn-in (I've had the Moto X since October 2013). That isn't to say it isn't there. It is, but it's not noticeable unless you look for it, and it really only shows up on bright solids.
Have you tried this? https://play.google.com/store/apps/details?id=be.ppareit.immersivemode&hl=en
Check out "Immersive Full-Screen Mode"
https://play.google.com/store/apps/details?id=be.ppareit.immersivemode