The smaller is the junction area, the more current goes through it. If you want to produce more photons with smaller area, you will inevitably run into that.
Those LED displays you can get in retail are nowhere close in die size to what microled is. Those conventional 1080P led displays with <1mm pitch already demonstrate very visible burnins. There is one in a hotel nearby that is only 4 moths old, and I can already distinguish an imprint from the brand logo, they seem to have unknowingly ran it on maximum brightness though.
Do you mean the LCD displays with LED backlights; that's what I've seen in retail, marketed as "LED TV"? Are you seeing burnin of the LEDs, or image retention on the LCD? LED burn in might look more like noticeably different white levels across the different local dimming areas, especially if it gets worse over time related to static brightness differences in the displayed image.
Those LED displays you can get in retail are nowhere close in die size to what microled is. Those conventional 1080P led displays with <1mm pitch already demonstrate very visible burnins. There is one in a hotel nearby that is only 4 moths old, and I can already distinguish an imprint from the brand logo, they seem to have unknowingly ran it on maximum brightness though.