Patent ID: 7283189

Claim:
An in-plane switching liquid crystal display comprising a first polarizer, a horizontally aligned liquid crystal cell filled with liquid crystals having positive dielectric anisotropy (Δε>0) or negative dielectric anisotropy (Δε<0), and a second polarizer, the optical axis of the liquid crystals in the liquid crystal cell lying in a plane parallel to the polarizers, in which the absorption axis of the first polarizer is perpendicular to the absorption axis of the second polarizer, the optical axis of the liquid crystals in the liquid crystal cell is parallel to the absorption axis of the adjacent first polarizer, and at least one negative biaxial retardation film (n x >n y >n z wherein n x and n y represent in-plane refractive indexes, and n z represents the thickness-direction refractive index of the film) and at least one positive C-plate (n x =n y <n z ) are arranged between the polarizers and the liquid crystal cell, in which the optical axis of the negative biaxial retardation film is arranged perpendicularly to either (a) the absorption axis of the polarizer just adjacent to the negative biaxial retardation film, or (b) the absorption axis of the polarizer adjacent to the liquid crystal cell if the negative biaxial retardation film is adjacent to the liquid crystal cell, the negative biaxial retardation film having negative thickness-direction retardation value (R th, biaxial =d×(n x −n y ) wherein d represents the thickness of the film) and positive in-plane retardation value (R in, biaxial =d×(n x −n y ) wherein d represents the thickness of the film), and the positive C-plate having thickness-direction retardation value (R th, positive C plate =d×(n z −n y ).