I’ve had my phone for some years and in the beginning I’d noticed something called screenburn where some elements of the screen always vaguely showed especially when I had my light settings all the way up and no blue filter mode on. With the blue filter and lower settings it doesn’t happen. But how do these screenburns even happen in the first place?
In: Technology
Every pixel in Organic Light Emitting Device (OLED) screens in phones and TVs produces its own light. This is in contrast to LED screens where each pixel has filters to cut out light from a uniform backlight.
Each pixel in an OLED has to produce its one light and their max brightness decreases if they are on for too long. Therefore, if you have parts of your screen always on, for example clocks, TV channel logos, or even interfaces from video games, those illuminated pixels will lose brightness if they are on for long periods of time. You want to cycle the pixels to show different things prevent this effect.
Now, if you display a full bright image on the entire screen, those worn out pixels will be dimmer and stand out. This causes the screenburn that you notice. The brightness difference is not as noticeable when displaying dimmer things.
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