In LCD or OLED displays, most of the display area emits light. There are black lines between the pixels, but they are thin, so it's hard to hide a seam in one.

In LCD or OLED displays, most of the display area emits light. There are black lines between the pixels, but they are thin, so it's hard to hide a seam in one. In contrast, the micro LEDs on this display are very small relative to the distance between them, "micrometer scale" vs. almost a millimeter. Most of the display area is actually a blank black surface, where a seam can be hidden. Making smaller displays this way will be a challenge as the pixels will have to get closer together.