Patent ID: 8872173

Claim:
A thin film transistor structure, comprising: a first gate and a second gate on a substrate; a gate insulating layer covering the first gate and the second gate; a first active layer and a second active layer disposed on the gate insulating layer and respectively over the first gate and the second gate, wherein a material of the first active layer and the second active layer is a metal oxide semiconductor; a first source and a first drain respectively located on two sides of the first gate and connecting the first active layer, wherein the first gate, the gate insulating layer, the first active layer, the first source and the first drain constitute a first transistor; a second source and a second drain respectively located on two sides of the second gate and connecting the second active layer, wherein the second gate, the gate insulating layer, the second active layer, the second source and the second drain constitute a second transistor; a first protection layer located on the first active layer; and a second protection layer located on and in contact with the second active layer, wherein materials of the first protection layer and the second protection layer are SiO x and SiO y , respectively, and x>y.