A rotation base has a base circular structure. A display backing has a backing circular structure. The backing circular structure is rotatably attached to the base circular structure to permit the display backing to rotate between landscape and portrait orientations relative to the rotation base. One of the base and backing circular structures defines a slot. The other of the base and backing circular structures defines a tab rotatably disposed within the slot.

A support device includes a support structure and a carrier assembly. The support structure includes a connection groove. The carrier assembly is configured to support a host system and/or a display device and includes a first connector. At least a part of the first connector is located in the connection groove and sliding in the connection groove. An angle between the host system and/or the display device and the support structure is adjusted in a first direction and/or a second direction by sliding the first connector in the connection groove.