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The "blooming" in TVs i know is a "process where the image size increases slightly when a brighter overall picture is displayed due to the increased electron beam current causing the CRT anode voltage to drop."
It relates to the subject of https://en.wikipedia.org/wiki/Overscan and screen safe areas. From what i know, blooming is applicable only to vacuum-tube (CRT) TVs and not to flat-screen TVs.