Hybrid Thin Film Transistor And Organic Light Emitting Display Using The Same

The present invention relates to a hybrid type thin film transistor in which different types of thin film transistors are arranged on the same flexible substrate and an organic light emitting display using the same. The organic light emitting display according to the present invention includes a flexible substrate having a display region and a non-display region, a first buffer layer disposed over the entire surface of the flexible substrate, a polycrystalline silicon (LTPS) layer disposed on the buffer layer in the display region, A driving transistor including a gate electrode, a first source electrode and a first drain electrode, and a capacitor electrode located above a first source electrode of the driving transistor and constituting a storage capacitor together with the first source electrode. Further, the organic light emitting display device is disposed on the display region with a gap therebetween, the switching transistor including an oxide semiconductor layer, a second gate electrode, a second source electrode, and a second drain electrode, And the dummy electrode is the third gate electrode of the switching transistor. According to another aspect of the present invention, an organic light emitting display includes a flexible substrate having a display region and a non-display region, a driving transistor located in a display region and a polycrystalline silicon (LTPS) layer being an active layer, And a switching transistor disposed apart from the driving transistor. The switching transistor includes a first gate electrode, an oxide semiconductor layer overlapping the gate electrode, a source electrode in contact with one side of the oxide semiconductor layer, a drain electrode in contact with the other side of the oxide semiconductor layer, and a first gate electrode And a second gate electrode.