| 摘要 |
PROBLEM TO BE SOLVED: To develop a phase difference plate enabling to form a liquid crystal display device capable of highly compensating the phase difference by double refractivity of a TN liquid crystal even in the case of a large-sized screen, and excellent in the angle of view of good visual recognition. SOLUTION: A composite phase difference plate 1 consists of laminates having one layer or two or more layers of (A) phase difference layers 11 and 14 of nx>=ny>=nz, when the refractive index of the thickness direction and intra-plane is set to nx, ny, and nz and the thickness to d, nx-ny=Δnxy, and (nx-nz)/Δnxy=Q, (B) phase difference layers 12 and 15 whose optical axis is inclined when nx>=ny>=nz and (C) phase difference layers 13 and 16 of Δnxy.d<=70 nm, and 1<=Q<=4 consisting of norbornene oriented film, respectively. When the refractive index of the thickness direction within the surface of the laminate is set to Nx, Ny, and Nz and the thickness to D, Nx>=Ny, (Nx-Ny)=ΔNxy, and (Nx+Ny)/2-Nz}.D=Rth, ΔNxy.D on the basis of monochromatic light with a wavelength of 590 nm is 25 to 100 nm, and Rth is 100 to 300 nm, and the angle βformed by a normal and Nz to the laminate surface is 5 to 30 deg.. |
