Module for a liquid crystal display comprising a first polarizer and a second polarizer having first and second machine directions and liquid crystal display including the same

Patent metadata

Field	Value
Publication number	US-9575355-B2
Application number	US-201414561179-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 27, 2013
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

The module for a liquid crystal display includes a liquid crystal display panel, a first polarizer formed on an upper side of the liquid crystal display panel, and a second polarizer formed on a lower side of the liquid crystal display panel, wherein the first polarizer has a length in a machine direction, the second polarizer has a width in the machine direction, a shrinkage force of the second polarizer is greater than a shrinkage force of the first polarizer, and the length of a polarizer is greater than the width of a polarizer.

First claim

What is claimed is:

1. A module for a liquid crystal display, comprising:
a liquid crystal display panel;
a first polarizer on a first side of the liquid crystal display panel; and
a second polarizer on a second side of the liquid crystal display panel,
wherein the first polarizer has a long dimension in a first machine direction of the first polarizer, the second polarizer has a short dimension in a second machine direction of the second polarizer, and a shrinkage force of the second polarizer is greater than a shrinkage force of the first polarizer, and wherein the first polarizer has a shrinkage force of about 9.5 N to about 18 N, and the second polarizer has a shrinkage force of about 10 N to about 23 N.

2. The module for a liquid crystal display according to claim 1 , wherein a ratio of the shrinkage force of the second polarizer to the shrinkage force of the first polarizer is about 1.01 to about 2.

3. The module for a liquid crystal display according to claim 1 , wherein a ratio of a thickness of the second polarizer to a thickness of the first polarizer is about 1 to about 3.

4. The module for a liquid crystal display according to claim 1 , wherein the first polarizer has a thickness of about 10 μm to about 25 μm and the second polarizer has a thickness of about 10 μm to about 25 μm.

5. The module for a liquid crystal display according to claim 1 , wherein a first polarizing plate comprising the first polarizer is on the first side of the liquid crystal display panel, a second polarizing plate comprising the second polarizer is on the second side of the liquid crystal display panel, and a ratio of the thickness of the first polarizing plate to the thickness of the second polarizing plate is about 1 to about 3.

6. The module for a liquid crystal display according to claim 1 , wherein each of the first polarizer and the second polarizer is produced by passing a polyvinyl alcohol film through a swelling bath, a dyeing bath, a crosslinking bath and a stretching bath, and each of the shrinkage forces of the first polarizer and the second polarizer are adjusted by altering a concentration of a crosslinking agent in the crosslinking bath and/or a temperature of the stretching bath.

7. The module for a liquid crystal display according to claim 6 , wherein each of the first polarizer and the second polarizer satisfies at least one of conditions (i) or (ii):
(i) C 2 >C 1 , wherein C 2 is a concentration of the crosslinking agent in the crosslinking bath for the second polarizer, and C 1 is a concentration of the crosslinking agent in the crosslinking bath for the first polarizer; or
(ii) T 2 >T 1 , wherein T 2 is a temperature of the stretching bath for the second polarizer, and T 1 is a temperature of the stretching bath for the first polarizer.

8. The module for a liquid crystal display according to claim 1 , wherein each of the first polarizer and the second polarizer comprises at least one of an optical functional film, an adhesive layer and a coating layer formed on at least one side.

9. A liquid crystal display panel comprising the module for a liquid crystal display according to claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Do Won
• Chung Hae Ryong

Classifications

• G02F1/133528 Primary

  Polarisers · CPC title

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title