Samsung patents modular screens that link together to form one display

1. A display device of a modular display device comprising a plurality of display devices, the display device comprising: a plurality of communication interfaces respectively provided at four directions based on a front surface of the display device and configured to communicate with a plurality of other display devices arranged at different sides of the display device; and at least one processor configured to: identify, based on a first signal transmitted by a main control box being received through a first communication interface from among the plurality of communication interfaces, the first communication interface as having received the first signal along a main connection path, based on receiving the first signal through the first communication interface, control a plurality of remaining communication interfaces among the plurality of communication interfaces, other than the first communication interface, to output the first signal to the plurality of other display devices, respectively, based on controlling the plurality of remaining communication interfaces to output the first signal to the plurality of other display devices, identify, among the plurality of remaining communication interfaces, a second communication interface as having transmitted the first signal along the main connection path based on a feedback signal indicating a receipt of the first signal being received through the second communication interface, and identify, based on a second signal transmitted by a sub control box being received through the second communication interface from among the plurality of communication interfaces, the second communication interface as having received the second signal along a sub connection path, wherein the main connection path is for sequentially transmitting the first signal transmitted by the main control box to the plurality of display devices, respectively, and wherein the sub connection path is for sequentially transmitting the second signal transmitted by the sub control box to the respective display devices in a reverse order than the main connection path.