US 8,379,169 B2 · Optical display device having polarizing film

Abstract

Provided is an optical display device using a polarizing film which has a thickness of 10 μm or less and exhibits high optical characteristics. The optical display device comprises a continuous web of polarizing film which is made of a polyvinyl alcohol type resin having a molecularly oriented dichroic material, and formed through stretching to have a thickness of 10 μm or less and satisfy conditions expressed by the following formulas: P>−(100.929T-42.4−1)×100 (where T<42.3); and P≧99.9 (where T≧42.3), wherein T is a single layer transmittance, and P is a polarization rate. The polarizing film may be prepared by subjecting a laminate comprising a non-crystallizable ester type thermoplastic resin substrate and a polyvinyl alcohol type resin layer formed on the substrate to by 2-stage stretching consisting of preliminary in-air stretching and in-boric-acid-solution stretching.

Claims30

Dependent claims

An optical display device comprising a first polarizing film made of a polyvinyl alcohol type resin including a molecularly oriented dichroic material therein,

the first polarizing film being stretched to have a thickness of 10 μm or less and satisfying conditions expressed by the following formulas:
P>−(100.929T-42.4−1)×100 (where T<42.3);
and P≧99.9 (where T≧42.3),
wherein T is a single layer transmittance, and P is a polarization rate,
the first polarizing film having a first surface joined to a surface of a display panel through a first optically transparent adhesive layer, an opposite second surface of the first polarizing film being joined to a protective layer.

2 more elements

Dependencies are inferred from the claim text.

Optical display device having polarizing film

Life of this patent

Optical display device having polarizing film

Life of this patent

Abstract

Claims30