Patent ID: 8158985
Filing Date: 2012-04-17
Classification: H01L

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