Structure of in-plane switching mode LCD with improved aperture ratio of pixel region and process for producing same

A process for forming an in-plane switching mode liquid crystal display (IPS-LCD), comprising steps of:

• providing a substrate made of an insulating material;
• forming a first conductive layer on a first side of said substrate, and defining a gate conductive structure, and a bus portion of a common electrode;
• forming a tri-layer structure consisting of a gate insulation layer, a semiconductor layer, and an etch stopper layer;
• defining an etch stopper structure with a portion of said semiconductor layer exposed;
• forming a highly doped semiconductor layer, and defining a contact via for interconnection to said bus portion of said common electrode;
• forming a second conductive layer made of a material selected from a group consisting of indium tin oxide, indium zinc oxide and indium lead oxide, and defining source/drain regions, a data line, a pixel portion of a data electrode, and a pixel portion of said common electrode with said etch stopper structure and said gate insulation layer as a stopper, wherein said pixel portion of said common electrode is interconnected to said bus portion of said common electrode through said contact via;
• and
• forming a passivation layer, and defining a pixel region for exposing said pixel portions of said data and common electrodes.