The new OLEDs have tons of techniques for reducing burn in. Like lowering brightness just for static images, pixel refreshes, screensaver etc. For example when there is no motion on my screen for a while the picture gets darker. Even though I'm using it mostly as a desktop I do not expect any burn in anytime soon. And if it has noticeable burn in in 4 years it's time to get a new TV anyway. By then we'll have affordable micro LEDs.
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