True AMOLED display ? Is my device defective ?

Hi. I don’t have any way to show this but my unit has what I think is backlight bleed when displaying a fully black (#000000) picture.
This bleeding is somehow especially visible at 35% (don’t ask me why) and 100% brightness.
Now, it’s only really visible when in the dark and when my eyes are used to it so it’s not a big deal for daily use. However, this screen is supposed to be AMOLED which presumably works on the same principle of OLED displays.

My OnePlus 3T, with the same picture of a…

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Source: XDA