Thin Film Transistor Substrate and Display Apparatus Comprising the Same

A thin film transistor substrate comprising:

• a first thin film transistor on a base substrate;
• a second thin film transistor on the first thin film transistor;
• and
• a first protective pattern between the first thin film transistor and the second thin film transistor,
• wherein the first thin film transistor includes:
• a first active layer on the base substrate;
• and
• a first gate electrode spaced apart from the first active layer, the first active layer including a first channel portion that overlaps the first gate electrode,
• wherein the second thin film transistor includes:
• a second active layer on the base substrate;
• and
• a second gate electrode spaced apart from the second active layer,
• wherein the second active layer includes:
• a second channel portion that overlaps the second gate electrode;
• a second source connection portion connected to one side of the second channel portion;
• and
• a second drain connection portion connected to another side of the second channel portion, the first protective pattern overlapping the second channel portion and covers an entire second channel portion on a plane.