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But OLEDs' light output decreases with usage. So if you leave them on indefinitely they become dimmer, and that's where the misnamed "burn-in" phenomenon comes from (it's really a "burn-out", and utterly unrelated to the burn-in that plasma displays suffer from): the LEDs producing the brightest parts of a static pattern eventually become dimmer, resulting in a negative impression when displaying a uniform colour. I've seen this on display phones, though never on a phone that has been used normally.I've never had burn in with a Samsung Super AMOLED display. In fact, pure OLED screens cannot burn in. Organic LEDs create their own light and require no LED backplane. So they can switch on and off (or stay on indefinitely) with no harm done.