Optical laminated body, optical laminated body set, and liquid crystal panel using optical laminated body or optical laminated body set

Patent metadata

Field	Value
Publication number	US-9164210-B2
Application number	US-201214130211-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Aug 5, 2011
Publication date	Oct 20, 2015
Grant date	Oct 20, 2015

Abstract

There is provided an optical laminate that significantly suppresses the warping of a liquid crystal panel and can realize high contrast. An optical laminate of the present invention includes: a polarizing film having a thickness of 10 μm or less; and a reflective polarization film. A liquid crystal panel of the present invention includes: a liquid crystal cell; and the optical laminate of the present invention. According to another aspect of the present invention, an optical laminate set is provided. The optical laminate set includes: a first optical laminate that is the optical laminate of the present invention as described above; and a second optical laminate including a polarizing film having a thickness larger than the thickness of the polarizing film of the first optical laminate by 5 μm or more.

First claim

The invention claimed is:

1. An optical laminate set, comprising:
a first optical laminate including a first polarizing film having a thickness of 10 μm or less; and a reflective polarization film; and
a second optical laminate including a second polarizing film having a thickness larger than the thickness of the first polarizing film of the first optical laminate by 5 micrometer or more;
wherein the second optical laminate is placeable on a viewer side of a liquid crystal panel and the first optical laminate is placeable on a side opposite to the viewer side.

2. The optical laminate set according to claim 1 , wherein the first polarizing film is obtained by transverse stretching.

3. A liquid crystal panel, comprising:
a liquid crystal cell; and
the optical laminate set according to claim 1 ;
wherein the second optical laminate of the optical laminate set is placed on a viewer side and the first optical laminate is placed on a side opposite to the viewer side.

4. The optical laminate set according to claim 1 , wherein the first polarizing film is bonded directly to the reflective polarizing film.

5. The optical laminate set according to claim 1 , wherein the first polarizing film is bonded to the reflective polarizing film via an adhesive layer.

6. The optical laminate set according to claim 1 , wherein the transmission axis of the first polarizing film is substantially parallel to the transmission axis of the reflective polarizing film.

7. The optical laminate set according to claim 1 , wherein the first polarizing film has a thickness of 1 μm to 7 μm.

8. The optical laminate set according to claim 7 , wherein the first polarizing film has a thickness of 1 μm to 5 μm.

9. The optical laminate set according to claim 1 , wherein the reflective polarizing film is a multilayer laminate comprising a layer A having a birefringence and a layer B substantially free of birefringence,
wherein the layer A and the layer B are alternately laminated.

10. The optical laminate set according to claim 1 , wherein the reflective polarizing film comprises a reflecting layer, which is the outermost layer and is formed opposite to the first polarizing film.

11. A liquid crystal panel, comprising:
a liquid crystal cell; and
the optical laminate set according to claim 10 .

12. The optical laminate set according to claim 1 , wherein the reflective polarizing film has a thickness of 50 μm to 600 μm.

13. The optical laminate set according to claim 1 , further comprising a protective film formed on a side of the second polarizing film.

14. The optical laminate set according to claim 13 , wherein the protective film has a thickness of 20 μm to 100 μm.

15. A liquid crystal panel, comprising:
a liquid crystal cell; and
the optical laminate set according to claim 13 .

Assignees

• Sawada Hiroaki
• Araki Tatsuya
• Kondo Seiji
• Miyatake Minoru
• Nitto Denko Corp

Inventors

• Sawada Hiroaki
• Araki Tatsuya
• Kondo Seiji
• Miyatake Minoru

Classifications

• G02B5/3041 Primary

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• G02F2201/54

  Arrangements for reducing warping-twist · CPC title

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02B5/305 Primary

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