MicroLED
It is an emerging display technology. It consists displays consist of arrays of microscopic LEDs forming the individual pixel elements.
MicroLED displays offer better resolution, contrast, response times, and energy efficiency.



COB (Chip-on-board)
It is another technology. With full-flip chip design, it eliminates the need of soldering wires between LED chips & the PCB substrate. 
The screen is coated which allows it to feel smooth rather than pixeated, and is an ideal solution where it needs some protection from moisture, and scratch. 
It can also stand the impact to a certian degrees. Seewall is developing COB panels in pixel pitch 0.9mm & 1.2mm.