Optical compensation films for LCDs of both in-plane switching (IPS) and advanced super-dimension switching (ADSDS or ADS) types

摘要

Two optical compensation films (606, 607) are arranged one on each side of an active-matrix LCD cell of the in-plane switching (IPS) or "Advanced Super Dimension" switching (ADSDS or ADS) types. The ADS electrode-stucture (fig.2) is essentially that of a fringe-field switching (FFS) type. The first and second compensation films (606, 607) are provided between the TFT substrate (601) and the first polarizer (604) and between the colour-filter substrate (602) and the second polarizer (605), respectively. The refractive indices and retardation values of both films are the same but their respective slow-axes are mutually orthogonal. The slow-axis of the first compensation film (606) is arranged to be either parallel or perpendicular to the transmission axis of the first polarizer (604). The various polarisation states inside the device are illustrated using the Poincaré Sphere method.