Iodine-type polarizing plate enables neutral white in white display and neutral black in black display

Abstract

A polarizing plate comprising a uniaxial stretched polyvinyl alcohol resin film with iodine adsorbed thereto in an oriented state and a protection film bonded to at least one surface of the resin film. The polarizing plate has a single transmittance of about 42.5% or more, a degree of polarization of about 99% or more, and a neutral coefficient Np of 0 to about 4 which is calculated from expression (I), and the polarizing plate also satisfies the relationship represented by expression (II); Np=|{square root over ((Pa*)2+(Pb*)2)}−{square root over ((Qa*)2+(Qb*)2)}|  (I) wherein Pa*, Pb*, Qb*, and Qa* respectively denote a* and b* in a parallel hue and a* and b* in a perpendicular hue in L*a*b* color system; {square root over ((Pa*)2+(Pb*)2)}<4.5  (II). The resultant polarizing plate enables neutral white in the case of white display and neutral black in the case of black display, bright white display, and high-contrast display.

Dependencies are inferred from the claim text.