Patent ID: 7667793

Claim:
A liquid crystal display device of an in-plane switching mode which comprises a pair of polarizers which are a polarizer at an output side and a polarizer at an incident side and disposed at relative positions such that absorption axes of the polarizers are approximately perpendicular to each other and at least optically anisotropic member (A), optically anisotropic member (B) and a liquid crystal cell which are disposed between the pair of polarizers, wherein n zA >n yA and n xB >n zB when, with respect to optically anisotropic member (A) and optically anisotropic member (B), refractive indices in a direction of an in-plane slow axis are represented by n xA and n xB , respectively, refractive indices in a direction in-plane and perpendicular to the direction of an in-plane slow axis are represented by n yA and n yB , respectively, and refractive indices in a direction of a thickness are represented by n zA and n zB , respectively, each measured using light having a wavelength of 550 nm, wherein the liquid crystal display device is in the following configuration, wherein optically anisotropic member (A) and optically anisotropic member (B) are disposed between the polarizer at the output side and the liquid crystal cell, the absorption axis of the polarizer at the incident side and the in-plane slow axis of the liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions parallel to each other, the in-plane slow axis of optically anisotropic member (A) and the in-plane slow axis of optically anisotropic member (B) are disposed at relative positions approximately parallel to each other, and the in-plane slow axis of optically anisotropic member (B) and the in-plane slow axis of the liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions approximately parallel to each other, and wherein an in-plane retardation R e (A), a retardation in the direction of the thickness R th (A) of optically anisotropic member (A), and an in-plane retardation R e (B), a retardation in the direction of the thickness R th (B) of optically anisotropic member (B) satisfy the following formulae: 70 ≦R e ( A )≦120, −65 ≦R th ( A )≦−25, 50 ≦R e ( B )≦110 and 25 ≦R th ( B )≦70, wherein R e (A)=(n xA −n yA )×d A , R e (B)=(n xB −n yB )×d B , R th (A)=[(n xA +n yA )/2−n zA ]×d A , R th (B)=[(n xB +n yB )/2−n zB ]×d B , d A and d B representing thicknesses of optically anisotropic member (A) and (B), respectively, and the units of retardations in the formulae described above are expressed by nm.