US Patent 11769834 Thin film transistor and display substrate having the same

A display substrate including a base substrate, a first thin film transistor disposed on the base substrate and including a first gate electrode and a first semiconductor active layer; a second thin film transistor electrically connected to the first thin film transistor, the second thin film transistor including a second gate electrode and a second semiconductor active layer; and an organic light emitting device electrically connected to the second thin film transistor. The first semiconductor active layer includes a first material and the second semiconductor active layer includes a second material different from the first material.