Liquid crystal display

Patent metadata

Field	Value
Publication number	US-11209693-B2
Application number	US-201916967105-A
Country	US
Kind code	B2
Filing date	Sep 20, 2019
Priority date	Sep 21, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

Provided is a liquid crystal display comprising: a liquid crystal cell; an upper polarizing plate provided on one surface of the liquid crystal cell and including a first polarizer and a low moisture-permeable film disposed on one surface of the first polarizer so as to face the liquid crystal cell; and a lower polarizing plate provided on the other surface of the liquid crystal cell and including a second polarizer, wherein a ratio of a shrinkage force in a direction parallel to the absorption axis of the second polarizer of the low moisture-permeable film to a shrinkage force in an absorption-axial direction of the second polarizer is 30% or more.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a liquid crystal cell;
an upper polarizing plate provided on one surface of the liquid crystal cell and including a first polarizer and a low moisture-permeable film disposed on one surface of the first polarizer so as to face the liquid crystal cell; and
a lower polarizing plate provided on the other surface of the liquid crystal cell and including a second polarizer,
wherein:
a ratio of a shrinkage force of the low moisture-permeable film in a direction parallel to the absorption-axis of the second polarizer to a shrinkage force of the second polarizer in an absorption-axial direction is 30% or more;
the low moisture-permeable film has in-plane retardation (Re) of 500 nm or less; and
the low moisture-permeable film has thickness direction retardation (Rth) of 8400 to 10,000 nm.

2. The liquid crystal display according to claim 1 , wherein the low moisture-permeable film has a water vapor transmission rate of 30 g/m2·day or less.

3. The liquid crystal display according to claim 1 , wherein the low moisture-permeable film has a coefficient of thermal expansion of −30 to 30 μm/m° C.

4. The liquid crystal display according to claim 1 , wherein the low moisture-permeable film is a biaxially stretched polyester film.

5. The liquid crystal display according to claim 4 , wherein the biaxially stretched polyester film is polyethylene terephthalate (PET) film.

6. The liquid crystal display according to claim 1 , wherein the first and second polarizers are polyvinyl alcohol-based films.

7. The liquid crystal display according to claim 1 , wherein:
the liquid crystal cell includes a color filter substrate, a TFT (thin film transistor) array substrate, and a liquid crystal layer interposed between the color filter substrate and the TFT array substrate;
the upper polarizing plate is provided on the color filter substrate of the liquid crystal cell; and
the lower polarizing plate is provided on the TFT array substrate of the liquid crystal cell.

8. The liquid crystal display according to claim 7 , wherein the upper polarizing plate further includes a protective film interposed between the first polarizer and the color filter substrate.

9. The liquid crystal display according to claim 8 , wherein the protective film is a COP (Cyclo-Olefin Polymer)-based film, an acrylic film, a TAC (Tri-Acetyl Cellulose)-based film, a COC (Cyclo-Olefin Copolymer)-based film, a PNB (Polynorbornene)-based film, or a PET (Polyethylene Terephthalate)-based film.

10. The liquid crystal display according to claim 1 , wherein the lower polarizing plate further includes protective film(s) provided on at least one surface of the second polarizer.

11. The liquid crystal display according to claim 10 , wherein the protective film(s) are each independently a COP (Cyclo-Olefin Polymer)-based film, an acrylic film, a TAC (Tri-Acetyl Cellulose)-based film, a COC (Cyclo-Olefin Copolymer)-based film, a PNB (Polynorbornene)-based film, or a PET (Polyethylene Terephthalate)-based film.

12. The liquid crystal display according to claim 1 , further comprising a backlight unit disposed on one surface of the lower polarizing plate so as to face the liquid crystal cell.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Jae Min
• Park Jin Yong
• Nah Sang Hyun
• Lee Won Chul
• Shin Jun Cheol

Classifications

• G02F1/133305

  Flexible substrates, e.g. plastics, organic film · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02F1/133711

  by organic films, e.g. polymeric films · CPC title

• G02F1/133311

  Environmental protection, e.g. against dust or humidity · CPC title

• G02F1/133531

  characterised by the arrangement of polariser or analyser axes · CPC title