Patent ID: 7619710

Claim:
An in-plane switching mode active matrix type liquid crystal display device comprising: a first substrate; a second substrate located opposing said first substrate; and a liquid crystal layer sandwiched between said first and second substrates, wherein said first substrate includes: a thin film transistor having a gate electrode, a drain electrode and a source electrode; a pixel electrode each associated to a pixel to be driven; a common electrode to which a reference voltage is applied; data lines; a scanning line; and common electrode lines, said gate electrode is electrically connected to said scanning line, said drain electrode is electrically connected to said data lines, said source electrode is electrically connected to said pixel electrode, and said common electrode is electrically connected to said common electrode lines, molecular axes of liquid crystal in said liquid crystal layer are rotated in a plane parallel with said first substrate by an electric field substantially parallel with a plane of said first substrate and to be applied between said pixel electrode and said common electrode, to thereby display certain images, said common electrode is composed of transparent material, and are formed on a layer located closer to said liquid crystal layer than said data lines, said common electrode entirely overlaps said data lines with an insulating layer being sandwiched therebetween except an area where said data lines are located in the vicinity of said scanning line, said in-plane switching mode active matrix type liquid crystal display device further includes a light-impermeable layer in an area where said common electrode entirely overlaps the data lines, said light-impermeable layer is formed on said second substrate or on said first substrate such that said light-impermeable layer and said liquid crystal layer are located at the same side with respect to said data lines and that said light-impermeable layer faces said data lines, said light-impermeable layer is comprised of a black matrix layer or multi-layered color layers, said black matrix layer or said multi-layered color layers has a width smaller than a width of said common electrode overlapping said data lines.