Patent ID: 6847414
Filing Date: 2005-01-25
Classification: G02F

Abstract:
1. A method for manufacturing a liquid crystal display including a pixel portion having a pixel TFT as well as a drive circuit portion having a first conductivity type TFT and a second conductivity type TFT, said method comprising the steps of: sequentially forming an un-doped silicon layer, a first conductivity type silicon layer and a metal layer over a substrate; patterning said metal layer and said first conductivity type silicon layer to form source and drain electrodes for said first conductivity type TFT at said drive circuit portion, source and drain electrodes for said pixel TFT and a bottom electrode of a storage capacitor at said pixel portion; sequentially forming a gate oxide layer and a gate metal layer on the overall surface over said substrate after being patterned; patterning said gate metal layer and said gate oxide layer to form a gate electrode for said first conductivity type TFT, a gate electrode for said second conductivity type TFT and a power electrode at said drive circuit portion as well as a gate electrode for said pixel TFT and said storage capacitor at said pixel portion; forming a first photo resist pattern on the surface over said substrate after being patterned, wherein said first photo resist pattern bares a predetermined region for said second conductivity type TFT; implanting second conductivity type impurities using said first photo resist pattern and said gate electrode for said second conductivity type TFT as masks such that source and drain electrodes for said second conductivity type TFT contain only said second conductivity type impurities; removing said first photo resist pattern; forming a passivation layer over the overall surface of said pixel portion and of said drive circuit portion; patterning said passivation layer to form contact holes to bare said power electrode, said source and drain electrodes for said first conductivity type TFT, said source and drain electrodes for said second conductivity type TFT, said source and drain electrodes for said pixel TFT as well as a top electrode of said storage capacitor; forming a transparent conductive oxide layer over both said pixel portion and said drive circuit portion, wherein said contact holes are filled up and said passivation layer is covered; and patterning said transparent conductive oxide layer on said passivation layer to form connections of said first conductivity type TFT, said second conductivity type TFT, said pixel TFT and said storage capacitor.