Polarizing plate with optical compensation film and liquid crystal display

• US 20030151705A1
• Filed: 02/08/2002
• Published: 08/14/2003
• Est. Priority Date: 03/27/2000
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Sugino, Youichirou, Takahashi, Yasushi, Satake, Masayuki, Kusumoto, Seiichi, Matsunaga, Takuya, Saiki, Yuuji, Shouda, Takashi, Kondou, Senri
• Granted Patent: US 6,747,720 B2
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: G02B 5/3083 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 Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation

Abstract

A polarizing plate is provided with an optical compensation film and includes a polarizing plate, an adhesive layer A, an optical compensation film, and an adhesive layer B adhered to one another, wherein the polarizing plate comprises a polyvinyl alcohol polarizing film containing a dichroic substance, and wherein the elastic modulus of the adhesive layer A of the polarizing plate with an optical compensation film is not greater than 0.06 MPa. Furthermore, a liquid crystal display is provided in which the polarizing plate with an optical compensation film is furnished on at least one side of the liquid crystal cell. Thus, display irregularities can be improved.

Claims

1. A polarizing plate with an optical compensation film, comprising a polarizing plate, an adhesive layer A, an optical compensation film, and an adhesive layer B, laminated to one another,

wherein the polarizing plate comprises a polyvinyl alcohol polarizing film containing a dichroic substance, and

wherein an elastic modulus of the adhesive layer A is not greater than 0.06 MPa.

2. The polarizing plate with an optical compensation film according to claim 1, wherein the elastic modulus of the adhesive layer A is at least 0.02 MPa and at most 0.05 MPa.

3. The polarizing plate with an optical compensation film according to claim 1, wherein the elastic modulus of the adhesive layer B is at least 0.08 MPa.

4. The polarizing plate with an optical compensation film according to claim 3, wherein the elastic modulus of the adhesive layer B is at least 0.09 MPa and at most 0.12 MPa.

5. The polarizing plate with an optical compensation film according to claim 1, wherein both the adhesive layer A and the adhesive layer B are adhesive agents comprising an acrylic resin.

6. The polarizing plate with an optical compensation film according to claim 1, wherein both the adhesive layer A and the adhesive layer B have a thickness in a range of at least 10 μ

m to at most 40 μ

m.

7. The polarizing plate with an optical compensation film according to claim 1, wherein a triacetyl cellulose film is formed integrally with at least one surface of the polarizing film.

8. The polarizing plate with an optical compensation film according to claim 1, wherein the optical compensation film comprises a film with an oriented liquid crystal polymer.

9. The polarizing plate with an optical compensation film according to claim 1, wherein a triacetyl cellulose film is formed integrally with at least one surface of the optical compensation film.

10. The polarizing plate with an optical compensation film according to claim 1, wherein at least one selected from the group consisting of a reflecting plate, a semitransparent reflector, a retardation plate, a λ

plate, and a brightness enhanced film is further laminated to the polarizing plate.

11. A liquid crystal display, comprising:

a liquid cell; and

a polarizing plate with an optical compensation film on at least one side of the liquid crystal cell, the polarizing plate with the optical compensation film comprising a polarizing plate, an adhesive layer A, an optical compensation film, and an adhesive layer B, laminated to one another;

wherein the polarizing plate comprises a polyvinyl alcohol polarizing film containing a dichroic substance, and

wherein an elastic modulus of the adhesive layer A is not greater than 0.06 MPa.

12. The liquid crystal display according to claim 11, wherein the elastic modulus of the adhesive layer A is at least 0.02 MPa and at most 0.05 MPa.

13. The liquid crystal display according to claim 11, wherein the elastic modulus of the adhesive layer B is at least 0.08 MPa.

14. The liquid crystal display according to claim 13, wherein the elastic modulus of the adhesive layer B is at least 0.09 MPa and at most 0.12 MPa.

15. The liquid crystal display according to claim 11, wherein both the adhesive layer A and the adhesive layer B are adhesive agents comprising an acrylic resin.

16. The liquid crystal display according to claim 11, wherein both the adhesive layer A and the adhesive layer B have a thickness in a range of at least 10 μ

m to at most 40 μ

m.

17. The liquid crystal display according to claim 11, wherein a triacetyl cellulose film is formed integrally with at least one surface of the polarizing film.

18. The liquid crystal display according to claim 11, wherein the optical compensation film comprises a film with an oriented liquid crystal polymer.

19. The liquid crystal display according to claim 11, wherein a triacetyl cellulose film is formed integrally with at least one surface of the optical compensation film.

20. The liquid crystal display according to claim 11, wherein at least one selected from the group consisting of a reflecting plate, a semitransparent reflector, a retardation plate, a λ

plate, and a brightness enhanced film is laminated to the polarizing plate.