Patent ID: 7696029
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. A method for forming a thin film device for a flat panel display, comprising: providing a substrate comprising a driving circuit region and a pixel region; forming a first polysilicon pattern layer on the driving circuit region of the substrate and simultaneously forming a second polysilicon pattern layer on the pixel region of the substrate; forming a masking layer over the driving circuit region of the substrate to cover the first polysilicon pattern layer and expose the second polysilicon layer; performing a first ion implantation on the exposed second polysilicon pattern layer using the masking layer as an implant mask, such that the first polysilicon pattern layer has an impurity concentration different from the second polysilicon pattern layer; removing the masking layer; forming a gate dielectric layer and an overlying gate on the first and second polysilicon pattern layers, respectively; and performing a second ion implantation on the first and second polysilicon pattern layers using each gate as an implant mask, to respectively form a source/drain region therein and respectively define a channel region, wherein dopants used in the first ion implantation have the same conductivity type as that used in the second ion implantation.