Led display device and led module connection method

An LED display device comprising:

• an array of a plurality of LED modules, wherein each of the plurality of LED modules comprises:
• a display unit including a plurality of LED elements;
• a signal processing unit configured to cause the display unit to display an image based on an image signal supplied from an external device;
• and
• a power supply unit configured to supply, to at least the signal processing unit, power that has been supplied from the outside,
• wherein the plurality of LED modules comprises a first LED module, and a second LED module connected to the first LED module,
• wherein the first LED module includes a first signal processing unit and a first power supply unit,
• wherein the second LED module includes a second signal processing unit, and a second power supply unit,
• wherein the LED display device further comprises:
• a first path configured to connect the first signal processing unit and the second signal processing unit, the first path being configured to supply signals including an image signal;
• a second path configured to connect the first signal processing unit and the second power supply unit, to supply a first power supply control signal which is to supply power from the second power supply unit of the second LED module to the second signal processing unit of the second LED module;
• and
• a third path configured to connect the first power supply unit and the second power supply unit, to supply, to the second power supply unit of the second LED module, power that has been supplied from outside to the first LED module.