Black line or edge flows like a liquid

Focus on that black edge that i marked in screenshot,
I recorded two videos.
One from another phones camera.
Another from screen recorder.
From another phone camera.
From screen recorder.
I hope you are seeing that the black edge is being curved while i move it down.
Means it flows from black to white side.
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Is it a problem or amoled display works like this??
It is the behavior of AMOLED panels.
We see the same behavior on black contrasts in other devices with AMOLED displays.
Thnks