Here’s a dramatic recreation to make it obvious (and so you can see what it looks like without needing an OLED).

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This usually means some part of the image looks like it lags when scrolling or animating. This GIF will show the effect if viewed on an OLED display. It’s reasonably subtle, but easy to spot once you know what it looks like.

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The same technique can be used with lots of different shapes. Here’s a rope-circle thing.

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The gist of how it works: There’s two images. A colour image, and a greyscale image that determines animation timing (lighter parts of the image are shown earlier). Here’s the timing map.

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What does OLED black smearing look like? In this example, the dark grey square seems to be lagging behind the light grey square, but they’re locked together. (Needs to be viewed on an OLED screen.)

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