Patent ID: 7518667

Claim:
A method of manufacturing a liquid crystal display device, said method comprising: providing a first transparent insulation substrate; forming a first conductive film on said first transparent insulation substrate; patterning said first conductive film to form a plurality of lower-layer scanning lines, making up a lower portion of a scanning line serving as a gate electrode of a thin film transistor, and a plurality of lower-layer common electrode wiring lines, making up a lower portion of a common electrode wiring line; forming a second conductive film on said first transparent insulation substrate; patterning said second conductive film to form a plurality of upper-layer scanning lines, making up an upper portion of said scanning line, and a plurality of common electrodes electrically connected to said common electrode wiring line; forming an inter-layer insulation film on said first transparent insulation substrate; forming a plurality of regions of a semiconductor layer on said inter-layer insulation film; forming a third conductive film on said semiconductor layer; patterning said third conductive film to form a plurality of lower-layer data lines, making up a lower portion of a data line, a plurality of lower-layer drain electrodes, making up a lower portion of a drain electrode, and a plurality of lower-layer source electrodes, making up a lower portion of a source electrode; forming a fourth conductive film on said first transparent insulation substrate; patterning said fourth conductive film to form a plurality of upper-layer data lines, making up an upper portion of said data lines, a plurality of picture element electrodes, a plurality of upper-layer drain electrodes, making up an upper portion of said drain electrodes, and a plurality of upper-layer source electrodes, making up an upper portion of said source electrodes; forming a protecting insulation film on said first transparent insulation substrate; and performing rubbing processing to form a first oriented film on said protecting insulation film, said picture element electrodes and said common electrodes thereby respectively comprising a thin single layer of conductive film in a pixel area whereas said scanning lines and said data lines respectively comprise a thicker double layer of conductive material in a periphery of said pixel area.