Display device having connection pads at multiple edges and composite display device

A display device comprising:

• a substrate including a first side and a second side adjoining the first side;
• a plurality of light emitters located on the substrate;
• a plurality of emission control signal lines located on the substrate to control an emission state or a non-emission state of the plurality of light emitters;
• and
• a plurality of connection pads located at an edge adjacent to the first side of the substrate and at an edge adjacent to the second side of the substrate, the plurality of connection pads being connected to the plurality of emission control signal lines, wherein
• the plurality of connection pads includes
• a plurality of first connection pads located along the first side of the substrate at the edge adjacent to the first side, the plurality of first connection pads being connected to a first emission control signal line of the plurality of emission control signal lines to control an emission state or a non-emission state of light emitters in a first group of the plurality of light emitters,
• a second connection pad located at the edge adjacent to the second side of the substrate, the second connection pad being connected to a second emission control signal line of the plurality of emission control signal lines to control an emission state or a non-emission state of light emitters in a second group of the plurality of light emitters,
• the substrate includes a third side adjoining the first side and located opposite to the second side, and
• the display device further comprises a third connection pad located at an edge adjacent to the third side of the substrate, and the third connection pad is connected to a third emission control signal line of the plurality of emission control signal lines to control an emission state or a non-emission state of light emitters in a third group of the plurality of light emitters.