A set of polarizing plates and an IPS mode liquid crystal display device using the same

摘要

PROBLEM TO BE SOLVED: To provide a polarizing plate set for a specific IPS mode liquid crystal cell that can ensure good visibility even in an environment with intense external light, and an IPS mode liquid crystal display device using the polarizing plate set.SOLUTION: The polarizing plate set includes a viewing side polarizing plate and a back side polarizing plate and is characterized in that: absorption axes of the viewing side polarizing plate and the back side polarizing plate are orthogonal to each other; the viewing side polarizing plate has a first polarizer and a λ/4 plate; the λ/4 plate is disposed between the first polarizer and an IPS mode liquid crystal cell; an angle formed by the absorption axis of the viewing side polarizing plate and a slow axis of the λ/4 plate is 45°; the back side polarizing plate has a second polarizer and a λ/2 plate; the λ/2 plate is disposed between the second polarizer and the IPS mode liquid crystal cell; an angle formed by the absorption axis of the back side polarizing plate and a slow axis of the λ/2 plate is 45°; the slow axis of the λ/4 plate and the slow axis of the λ/2 plate are parallel to each other; Nz coefficients of the λ/4 plate and of the λ/2 plate are -0.5 or more and 0.5 or less; and the slow axis of the λ/4 plate is disposed to satisfy an orthogonal relationship with respect to the initial alignment direction of the IPS mode liquid crystal cell.SELECTED DRAWING: Figure 2