Patent ID: 7675594

Claim:
An in-plane switching mode liquid crystal display device, comprising: a first and second substrates attached to face each other, the first substrate having gate lines, data lines, thin film transistors, common electrodes and pixel electrodes thereon, and the second substrate having a black matrix layer and color filter layers; a liquid crystal layer between the first and second substrates, the liquid crystal layer having a birefringence such that a refractive index for a longer axis direction of a liquid crystal molecule is different from that of a shorter axis direction of liquid crystal molecule; a first polarization film and a second polarization film on the first substrate and the second substrate, respectively, each of the first and second polarization films simultaneously performing an A-plate compensation film function and a polarization function, the first and second polarization films preventing light leakage in a horizontal direction, wherein the first and second polarization films are formed by adding dichroic dye to a liquid crystal, wherein a polarization axis of the second polarization film is set to a direction perpendicular to an alignment direction of the liquid crystal layer, and a polarization axis of the first polarization film is set to a direction parallel with the alignment direction of the liquid crystal layer; and a C-plate compensation film positioned between the second substrate and the liquid crystal layer, the C-plate compensation film preventing light leakage in a vertical direction.