| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is bright and provides an excellent contrast ratio both in reflective and transmissive display, is excellent in the balance of visibility both in the reflective and transmissive display and in particular has a viewing angle widened in the up and down directions. <P>SOLUTION: Using an alignment axis of an alignment layer disposed on the viewer's side of a liquid crystal display panel 1 as the reference, representing axial angles of an axis of polarization of a first polarizing plate 2 and of stretch axes of first and second retardation plates 3 and 4 by θ1, θ2 and θ3 respectively, each of the angle being anticlockwise when observed from the viewer's side, and representing retardation values of the first and second retardation plates 3 and 4 by ΔnF1.dF1 and ΔnF2.dF2 respectively, θ1, θ2 and θ3 are set to be 120-150°, 100-130° and 75-105°and ΔnF1.dF1 and ΔnF2.dF2 are set to be 520-600 nm and 130-150 nm respectively. Representing refractive indexes of each of the retardation plates 3 and 4 in directions of the stretch axes, in directions vertical to the stretch axes and in thickness directions by nx, ny and nz respectively, equation (nx-nz)/(nx-ny) = 0.3-0.7 holds for the first retardation plate 3 and a relation (nx-nz)/(nx-ny) ≈ 1 holds for the second retardation plate 4 respectively. <P>COPYRIGHT: (C)2004,JPO |
