Patent ID: 8183064

Claim:
A system for displaying images, comprising: a thin film transistor device, comprising: a substrate having a first region and a second region; a first gate layer disposed on the first region of the substrate; a first insulating layer covering the first gate layer; a first polysilicon active layer disposed on the first insulating layer; a second polysilicon active layer disposed on the second region of the substrate; a second insulating layer covering the first and second polysilicon active layers; a second gate layer disposed on the second insulating layer above the first polysilicon active layer; and a third gate layer disposed on the second insulating layer above the second polysilicon active layer, wherein a first thin film transistor is constituted by the first polysilicon active layer, the first and second gate layers, and the first and second insulating layers in the first region, and a second thin film transistor is constituted by the second polysilicon active layer, the third gate layer, and the first and second insulating layers in the second region.