Display device arbitrarily attachable to and detachable from other display devices

A display device for displaying data comprising:

• data acquiring means for acquiring data;
• display means for displaying the data acquired by said data acquiring means;
• operation means for operating said display device;
• control means for controlling said display device;
• infrared communication means for communicating with another display device;
• side surface coupling means for structurally coupling a side surface of said display device to a side surface of said another display device with which communication is made by said infrared communication means;
• and,
• wherein said side surface coupling means comprises a hinge structure located on one edge of said side surfaces and said infrared communication means are located in said side surfaces adjacent the hinge structure;
• wherein said infrared communication means comprises a pair of infrared communication modules respectively located in mutually opposing recesses of said side surfaces and having optical axes substantially aligned in a first positional arrangement of said display devices and substantially misaligned in a second positional arrangement of said display devices.