Display device

A display device comprising:

• a substrate comprising a display area in which a display element is arranged;
• a first thin-film transistor (TFT) arranged in the display area and comprising a first semiconductor layer including silicon semiconductor and a first gate electrode insulated from the first semiconductor layer;
• a first interlayer insulating layer covering the first gate electrode;
• a second TFT arranged on the first interlayer insulating layer and comprising a second semiconductor layer including oxide semiconductor and a second gate electrode insulated from the second semiconductor layer;
• a second interlayer insulating layer covering the second gate electrode;
• a first power supply voltage line arranged on the second interlayer insulating layer;
• a first planarization layer covering the first power supply voltage line;
• and
• a data line arranged on the first planarization layer and at least partially overlapping the first power supply voltage line.