> This is not something current LED displays are prone to,
I will disappoint you. LED displays have burn ins too! And with pixel sizes approaching that of OLED, burn ins will start sooner, and be more visible.
Samsung will not go for microled for consumer market until it gets "led on the backplane" going. That eliminates the transfer process, and most of cost associated with it.
The unsolved issue is current transfer. If you grow LED in-situ, you have to somehow put power supply there too, and preferably do it in the same manufacturing process.
If you have to transfer LEDs mechanically, it makes little cost difference to put LED driver ICs there mechanically too.
You're right that LED isn't immune from burn-in, however, it is much more resistant to it, and isn't necessarily permanent either. Leaving an LED display off for a few days, often less, can be enough to bring it back to normal.
Another artifact OLED displays have is their PenTile subpixel arrangement to compensate for the red, blue, and green organic compounds degrading at different rates. Hopefully micro LED brings us OLED quality with LCD reliability.
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.
I will disappoint you. LED displays have burn ins too! And with pixel sizes approaching that of OLED, burn ins will start sooner, and be more visible.
Samsung will not go for microled for consumer market until it gets "led on the backplane" going. That eliminates the transfer process, and most of cost associated with it.
The unsolved issue is current transfer. If you grow LED in-situ, you have to somehow put power supply there too, and preferably do it in the same manufacturing process.
If you have to transfer LEDs mechanically, it makes little cost difference to put LED driver ICs there mechanically too.