| 摘要 |
PURPOSE: To provide a member capable of suppressing light leakage even when obliquely viewed in a direction deviating from axes of polarization of polarizing plates arranged in crossed Nicols, and to provide a vertical alignment mode liquid crystal display device with excellent contrast in a wide viewing angle and with excellent display quality. CONSTITUTION: An optical sheet is provided with a transparent layer (12, 14) exhibiting anisotropy of refractive indexes expressed by nx≒ny>nz and having <= 10μm thickness on a side of an optical retardation film (11, 13) having 0.6-0.9 Nz and 200-350 nm (nx-ny) d, where a refractive index in the thickness direction is expressed as nz, the refractive indexes in the plane are expressed as nx, ny, an inequality nx>ny and an equation Nz=(nx-ny)/(nx-ny) are satisfied and the film thickness is expressed as d. The polarizing plate consists of a laminated body of the optical sheet (1) and a polarizing film (2). The liquid crystal display device consists of the vertical alignment mode liquid crystal cell (3) on the both sides of which the polarizing plates are arranged in the crossed Nicols with the transparent layers on the cell sides, and of an interposed optical retardation plate (4) if necessary. |
