Display device

1. A TFT array substrate comprising:

a substrate; and

a plurality of pixels arranged in the substrate;

wherein

each of the plurality of pixels includes a light emitting element, a first transistor, a second transistor, a first insulation layer, a third insulation layer, and a fourth insulation layer;

the first transistor includes a first semiconductor layer,

the second transistor includes a second semiconductor layer, a gate insulation layer, and a gate electrode,

the first insulation layer is arranged across the plurality of pixels between the first semiconductor layer and the second semiconductor layer,

the second semiconductor layer is in contact with the first insulation layer,

the gate insulation layer is stacked to cover the second semiconductor layer,

the gate electrode is arranged over the gate insulation layer,

the fourth insulation layer is stacked to cover the gate electrode and the second semiconductor layer,

the third insulation layer is stacked to cover the fourth insulation layer,

the first semiconductor layer is arranged on the substrate side sandwiching the first insulation layer with respect to the second semiconductor layer,

wherein the first insulation layer includes a silicon oxide layer and the fourth insulation layer includes an aluminum oxide layer, and

the aluminum oxide layer overlaps with the second semiconductor layer and does not overlap with the first semiconductor layer in a plan view.

2. The TFT array substrate according to claim 1 , wherein the first semiconductor layer is a polycrystal silicon layer and the second semiconductor layer is a semiconductor oxide layer.

3. The TFT array substrate according to claim 1 , wherein the first transistor is a drive transistor and the second transistor is a selection transistor.

4. The TFT array substrate according to claim 1 , wherein the second transistor has a top-gate structure.