A thin film transistor substrate comprises a gate line disposed on a substrate, a data line that crosses the gate line with a gate insulating film therebetween to define a pixel area, and a thin film transistor connected to the gate line and the data line. The thin film transistor substrate of a horizontal electric field applying type further comprises a pixel electrode plate connected to the thin film transistor, a protective film disposed to cover the data line, the thin film transistor and the pixel electrode plate on the gate insulating film, and a common electrode disposed at an array area provided with the thin film transistor array and disposed in a mesh shape on the protective film.
