It began at CES 2018, when Samsung revealed a wall-sized TV it calls "The Wall." Using a technology called 'MicroLED', it was the first brand-new display technology to be commercialized in more than a decade.
As a successor of OLED, MicroLED uses a similar technology but different implementation.
Going back to display history, TFTs and then LCDs were once desirable. But in the modern days, the technologies are regarded as old. This design creates a bulkier appearance which can also cause uneven brightness, color challenges and other problems.