Patent ID: 8980663
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A method of fabricating an organic light emitting diode (OLED) display device, comprising: providing a substrate having first and second regions; forming a first gate electrode over the first region of the substrate; forming a first gate insulating layer over the first gate electrode; forming a polycrystalline silicon (poly-Si) layer over the first gate insulating layer; forming a conductive material layer over the poly-Si layer; etching the poly-Si layer and the conductive material layer, and forming a first semiconductor layer, a first source electrode and a first drain electrode in the first region, and a second semiconductor layer, a second source electrode and a second drain electrode in the second region, wherein the first and second semiconductor layers are formed of the same material from the same processing; forming a second gate insulating layer over the first and second source and drain electrodes; forming a second gate electrode over the second region of the second gate insulating layer; forming a protective layer on the second gate electrode; etching the protective layer and the second gate insulating layer, and forming a via hole exposing one of the second source and drain electrodes; and forming an OLED including a lower electrode electrically connected with the second source and drain electrodes through the via hole on the protective layer forming the first and second etch stop layers over and contacting at least a partial regions of the first and second semiconductor layers.