Display device

A display device comprising:

• a substrate including:
• a display area in which a plurality of sub-pixels is arranged;
• and
• a non-display area disposed around the display area;
• a demux circuit portion disposed in the non-display area on the substrate and including:
• a first switching transistor including a part of a first lower gate pattern;
• a second switching transistor including a part of a second lower gate pattern;
• a first control line which is connected to the first lower gate pattern and supplies a first lighting test control signal or a first demux control signal;
• and
• a second control line which is connected to the second lower gate pattern and supplies a second lighting test control signal or a second demux control signal;
• and
• a lighting circuit portion electrically connected to the demux circuit portion and including:
• a third switching transistor which includes another part of the first lower gate pattern and receives the first lighting test control signal or the first demux control signal through the first control line;
• and
• a fourth switching transistor which includes another part of the second lower gate pattern and receives the second lighting test control signal or the second demux control signal through the second control line.