A thin film transistor substrate, a display including the same and a manufacturing method for the thin film transistor substrate

A thin film transistor substrate, a display including the same and a manufacturing method for the thin film transistor substrate are disclosed. The thin film transistor substrate is used for an organic light emitting diode display having two types of thin film transistors on a same substrate. The organic light emitting diode display is provided and includes a pixel zone disposed on the substrate; a first thin film transistor including an oxide semiconductor layer, a first gate electrode on the oxide semiconductor layer, a first source electrode and a first drain electrode; a second thin film transistor including a second gate electrode, a polycrystalline semiconductor layer on the second gate electrode, a second source electrode and a second drain electrode; a first gate insulating layer disposed under the first gate electrode and the second gate electrode and covering the oxide semiconductor layer; a second gate insulating layer disposed under the polycrystalline semiconductor layer and covering the first ga