Patent ID: 7420636

Claim:
An in-plane switching liquid crystal display comprising: a first polarizer plate; a liquid crystal cell, which is filled with liquid crystal of positive dielectric anisotropy (Δ∈>0) or negative dielectric anisotropy (Δ∈<0), an optical axis of the liquid crystal filled in the liquid crystal cell being aligned in-plane in parallel to a polarizer plate; and a second polarizer plate, wherein an absorption axis of the first polarizer plate is perpendicular to an absorption axis of the second polarizer plate, and the optical axis of the liquid crystal filled in the liquid crystal cell is parallel to the absorption axis of the first polarizer plate; and wherein an A-plate is interposed between the second polarizer plate and the liquid crystal cell, an optical axis of the A-plate is parallel to the absorption axis of the second polarizer plate, and an in-plane retardation value of the A-plate is in a range of 250 nm to 450 nm at a wavelength of 550 nm.