Patent ID: 7115431

Claim:
A method for manufacturing a reflective liquid crystal display including a pixel portion having a pixel TFT, a driving circuit portion having a first conductive type TFT and a second conductive type TFT, and a storage capacitor portion, said method comprising the steps of: forming a metal layer over the substrate; forming a first conductive type silicon layer over said metal layer; patterning said metal layer and said first conductive type silicon layer to form predefined portions for source and drain electrodes of said first conductive type TFT and source electrode of said second conductive type TFT at said driving circuit portion as well as for source and drain electrodes of said pixel TFT at said pixel portion and for the storage capacitor; forming successively an active layer and a gate oxide layer on all areas; patterning said gate oxide layer and said active layer to form a first preserved region overlaying a portion of the source electrode as well as the drain electrode of the first conductive type TFT and in between, a second preserved region overlaying a portion of the source electrode of the first conductive type TFT as well as the drain electrode of the second conductive type TFT and in between, a third preserved region overlying a portion of the source electrode as well as the drain electrode of the pixel TFT and in between; forming an insulator layer on all areas; patterning said insulator layer to form a plurality of bumps over said pixel TFT portion; forming a gate metal layer on all areas; patterning said gate metal layer to form a reference electrode, a gate electrode for said first conductive type TFT, a gate electrode for said second conductive type TFT, a top electrode for said storage capacitor, and a reflective metal layer overlying said bumps thereby connecting the drain electrode of said pixel TFT with the top electrode of said storage capacitor; doping impurities of said first conductive type into source and drain electrodes of said first conductive type TFT and of said pixel TFT by adopting LDD implantation and using all of said gate electrodes as masks; forming a photoresist pattern on all areas except said second preserved region; doping impurities of said second conductive type into source and drain electrodes of said second conductive type TFT by adopting LDD implantation and using said photoresist pattern and the gate electrode of said second conductive type TFT as masks, removing said photoresist pattern; forming a passivation layer on all areas; and patterning said passivation layer to expose said reflective metal layer and to form contact holes at the edge of said driving circuit portion and said pixel portion.