Polarizing plate with a retardation layer and image display apparatus

Patent metadata

Field	Value
Publication number	US-10107946-B2
Application number	US-201615206764-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 22, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

There is provided a thin polarizing plate with a retardation layer excellent in reworkability. A polarizing plate with a retardation layer according to the present invention includes: a polarizing plate including a polarizer and a protective layer on at least one side of the polarizer; a retardation layer; a first adhesive layer configured to bond the polarizing plate and the retardation layer; and a second adhesive layer arranged as an outermost layer on an opposite side of the retardation layer to the polarizing plate. An average linear expansion coefficient of the second adhesive layer when an ambient temperature is changed from −150° C. to 20° C. is 38.0(×10 −5 /° C.) or more, and is larger than an average linear expansion coefficient of the first adhesive layer when an ambient temperature is changed from −150° C. to 20° C.

First claim

What is claimed is:

1. A polarizing plate with a retardation layer, comprising:
a polarizing plate including a polarizer and a protective layer on at least one side of the polarizer;
a retardation layer;
a first adhesive layer configured to bond the polarizing plate and the retardation layer; and
a second adhesive layer arranged as an outermost layer on an opposite side of the retardation layer to the polarizing plate,
wherein an average linear expansion coefficient of the second adhesive layer when an ambient temperature is changed from −150° C. to 20° C. is 38.0(×10 −5 /° C.) or more, and is larger than an average linear expansion coefficient of the first adhesive layer when an ambient temperature is changed from −150° C. to 20° C.

2. The polarizing plate with a retardation layer according to claim 1 , wherein the polarizing plate with a retardation layer has a total thickness of layers except for the second adhesive layer of 140 μm or less.

3. The polarizing plate with a retardation layer according to claim 1 , wherein the retardation layer comprises a polycarbonate-based resin film.

4. The polarizing plate with a retardation layer according to claim 3 , further comprising another retardation layer on an outside of the retardation layer.

5. The polarizing plate with a retardation layer according to claim 1 , wherein the retardation layer comprises an alignment fixed layer of a liquid crystal compound.

6. The polarizing plate with a retardation layer according to claim 5 , wherein the retardation layer has a laminated structure of: a first alignment fixed layer of a liquid crystal compound; and a second alignment fixed layer of a liquid crystal compound.

7. The polarizing plate with a retardation layer according to claim 1 , further comprising one of a conductive layer and an isotropic base material with a conductive layer on an outside of the retardation layer.

8. An image display apparatus, comprising the polarizing plate with a retardation layer of claim 1 .

Assignees

• Nitto Denko Corp

Inventors

• Kitagawa Takeharu
• Kojima Tadashi
• Sumimura Hiroshi

Classifications

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/3083 Primary

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• G02B5/3058

  comprising electrically conductive elements, e.g. wire grids, conductive particles · CPC title