A thin film transistor array substrate and an electronic device including the thin film transistor array are disclosed. The thin film transistor comprises a substrate, a first active layer on the substrate, a gate electrode on the first active layer, a second active layer on the gate electrode such that the gate electrode is between the first active layer and the second active layer. The gate electrode is configured to drive the first active layer and the second active layer. Thereby, it is possible to provide the thin film transistor array substrate including one or more thin film transistors having high current characteristics in a small area, and the electronic device including the thin film transistor array substrate.