Polarizing plate and display device having the same

Patent metadata

Field	Value
Publication number	US-10353126-B2
Application number	US-201715798096-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 31, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A polarizing plate and a display device including the same of the present disclosure absorb and disperse an external impact by laminating thin films having different strengths. As described above, according to the present disclosure, instead of a thick cover window, a thin film is used so that thin thickness, light weight, and low cost of the polarizing plate may be achieved. Further, the manufacturing process is simplified and the processing cost is reduced.

First claim

What is claimed is:

1. A polarizing plate, comprising:
a polarizer;
a first film configured to a low strength and high hardness film on an outermost layer of the polarizing plate, the first film having a first strength formed by triacetate cellulose (TAC), or acryl, or polyethylene terephthalate (PET), or cyclo olefin polymer (COP), with a tensile/bending elasticity modulus within a range of 10 MPa to 500 MPa; and
a second film configured to a high strength and low hardness film, the second film having a second strength formed by polyimide (PI), or tempered acyl, or polycarbonate (PC), with a tensile/bending elasticity modulus within a range of 1000 MPa to 50000 MPa, the second film is positioned between the first film and the polarizer,
wherein the second strength is greater than the first strength.

2. The polarizing plate according to claim 1 , wherein the first film and the second film are alternately laminated above the polarizer plural times.

3. The polarizing plate according to claim 1 , further comprising:
a third film positioned between the second film and the polarizer, the third film having a third strength that is less than the second strength of the second film.

4. The polarizing plate according to claim 3 , further comprising:
an adhesive interposed between the second film and the third film.

5. The polarizing plate according to claim 3 , further comprising:
a bonding agent interposed between the third film and the polarizer.

6. The polarizing plate according to claim 1 , wherein the first film is configured to the low strength and high hardness film so as to absorb and attenuate an external impact and transmit the attenuated external impact to the second film, and the second film is configured to the high strength and low hardness film so as to disperse and absorb the external impact attenuated by the first film.

7. The polarizing plate according to claim 1 , wherein the first film has a tensile/bending elasticity modulus of 100±10 MPa.

8. The polarizing plate according to claim 1 , wherein the second film has a tensile/bending elasticity modulus of 10000±1000 MPa.

9. The polarizing plate according to claim 1 , further comprising:
a first bonding agent interposed between the first film and the second film.

10. A display device, comprising:
a display panel having a first substrate; and
a polarizing plate attached to first substrate, the polarizing plate including:
a polarizer;
a first film configured to a low strength and high hardness film on an outermost layer of the polarizing plate, the first film having a first strength formed by triacetate cellulose (TAC), or acryl, or polyethylene terephthalate (PET), or cyclo olefin polymer (COP), with a tensile/bending elasticity modulus within a range of 10 MPa to 500 MPa; and
a second film configured to a high strength and low hardness film, the second film having a second strength formed by polyimide (PI), or tempered acyl, or polycarbonate (PC), with a tensile/bending elasticity modulus within a range of 1000 MPa to 50000 MPa, the second strength is greater than the first strength, and the second film is positioned between the first film and the polarizer.

11. The display device according to claim 10 , further comprising:
an adhesive interposed between the polarizing plate and the first substrate of the display panel.

12. The display device of claim 10 , wherein the display panel includes a second substrate opposite to the first substrate, and a liquid crystal layer between the first and second substrates.

13. The display device of claim 12 , further comprising a second polarizing plate attached to the second substrate of the display panel.

14. The display device of claim 10 , wherein the first film has a tensile/bending elasticity modulus of 100±10 MPa.

15. The display device of claim 10 , wherein the second film has a tensile/bending elasticity modulus of 10000±1000 MPa.

16. The display device of claim 10 , wherein the polarizing plate further includes:
a third film positioned between the second film and the polarizer, the third film having a third strength that is less than the second strength of the second film.

Assignees

• Lg Display Co Ltd

Inventors

• Park Wonki
• Lee Daeheung

Classifications

• G02B5/305 Primary

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

• G02F1/133528

  Polarisers · CPC title

• G02B1/14

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

• G02F2202/28

  Adhesive materials or arrangements · CPC title

• B29D11/0073

  Optical laminates · CPC title