Thin film transistor substrate and display apparatus comprising the same

A display apparatus comprising:

• a substrate;
• a first thin film transistor on the substrate, the first thin film transistor including a first active layer and a first gate electrode;
• a second thin film transistor on the substrate and including a second active layer and a second gate electrode, the second active layer electrically connected to the first active layer and farther from the substrate than the first active layer and the second gate electrode farther from the substrate than the first gate electrode;
• a first insulating layer between the first gate electrode and the second active layer;
• a second insulating layer between the second active layer and the second gate electrode;
• a first connection electrode connecting together the first active layer and the second active layer;
• and
• one or more pixels on the substrate, the one or more pixels configured to emit light,
• wherein a top of the first connection electrode is under the second insulating layer,
• wherein the first connection electrode comprises a second source electrode of the second thin film transistor or the second active layer of the second thin film transistor.