Patent ID: 7599034
Filing Date: 2009-10-06
Classification: G02F,H01L

Abstract:
1. A thin film transistor substrate of a horizontal electric field type LCD, comprising: a substrate; a gate line and a common line disposed on the substrate and arranged parallel with each other; a data line disposed on the substrate intersecting with the gate line and the common line, the data line insulated from the gate line and the common line by a gate insulating film therebetween, a pixel area being defined by the intersection of the data line with the gate line; a thin film transistor disposed at the intersection of the data line and the gate line, and connected to the gate line and the data line; a common electrode disposed having a portion extended into the pixel area and connected the common line; a pixel electrode disposed having a portion extended into the pixel area and connected to the thin film transistor, wherein a horizontal electric field is formed by the pixel electrode and the common electrode; a protective film disposed over the common electrode, pixel electrode, data line, gate line, common line, and the thin film transistor; at least one pad structure including a gate pad, a common pad, and a data pad, wherein each of the pads includes a lower pad electrode and an upper pad electrode, wherein the lower pad electrode is connected to a respective one of the gate line, common line, and data line the upper pad electrode is disposed within a respective one of first to contact third holes defined through the protective film to contact the lower pad electrode such that the upper pad electrode is absent from the upper surface of the protective film; and a fourth contact hole defined through the protective film for the gate pad, pixel electrode, and a portion of a drain electrode, wherein a contact electrode disposed within the contact holes to contact a portion of the pixel electrode and the portion of the drain electrode such that the contact electrode is absent from the upper surface of the protective film.