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How does OLED burn-in truly happen and why doesn't my phone show any signs of it? (sh.itjust.works)

submitted 4 months ago by [email protected] to c/[email protected]

37 comments fedilink hide all child comments

Title almost says it all. OLED monitors are getting more and more affordable, but it's almost out of the picture when buying a monitor because of toolbars and HUD elements. I don't understand why monitors "burn-in", when I shine my LED flashlight or some LED xmas lights they won't simply start emitting the same light even when I turn them off. I know it's a dumb comparison, but still, what happens?

The other thing that I don't understand is the fact that I've never seen any signs of burn-in on anyone's phone. Alright, technically that's a lie, I did see some on a work phone (or two), that only had some chat app open, seemingly since ages, and the namebar was a bit burned-in, or something like that, as you'd guess I also didn't interact with that phone a lot. As as said above "but still," I've had my phone for a while now, so does my family and friends, some of us even doomscroll, and I've never seen any signs of burn-in on any (actually used) phone.

so, I can watch my background all day, but I should open my browser every like 3 hours press f11 twice and I'm safe? Ff I'm away just let the screensaver save my screen? In that case why would anyone ever worry about burn it, you almost have to do it intentionally. But if it's really dangerous, like I immerse myself into a youtube video, but it has the youtuber's pfp on the bottom right (does youtube still do that?), and it was hbomberguy's, am I just done, toasted, burnt-in?

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[–] [email protected] 5 points 4 months ago* (last edited 4 months ago) (1 children)

It's only marginally more detailed on the chemistry, but conventional semiconductors (inorganic) are roughly like metal. Silicon is literally a shiny, meltable element, although it's more brittle than a true metal. Like metal, unless they react with something like in rusting, they're probably going to stay the same kind of metal. There's exceptions if you really abuse a piece of metal, but a laymen probably hasn't thought much about tempering and differences in crystal structure

Organic semiconducters are organic compounds, like a dye. Just as a dye can bleach or change over time, they can chemically change with a lot less outside help. This makes them prone to not working the same way after prolonged use. Blue and violet are the most energetic colours, so it makes sense the components emitting it would break down first. UV OLEDs would be even worse.

The reason we don't use arrays of inorganic LEDs as screens (yet) is that they're really picking hard and exacting to grow. The standard way to do it is grow a wafer which is about screen size, and then cut it up into tiny sections, only some of which will work, and each of which is worth something significant on it's own. OLED can be grown in less crazy conditions, more like just printing with ink, and Micro LED gets around the wafer problem by using a precise robot arm to handle, test and connect each sub-pixel individually.

[–] [email protected] 3 points 4 months ago* (last edited 4 months ago)

Cool video i saw a few days ago about the challenges of making true microLED displays. These would become the unchallenged king of displays if it became economical to make them and wouldnt have any of these issues.

https://www.youtube.com/watch?v=8_2KcB8JkfE