Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9904099-B2
Application number	US-201615285819-A
Country	US
Kind code	B2
Filing date	Oct 5, 2016
Priority date	Apr 7, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A liquid crystal display device includes: a front-side polarizing plate having a front-side polarizer; a liquid crystal cell; and a rear-side polarizing plate having a rear-side polarizer in this order, in which a distance D 1 from a central portion of the front-side polarizer to a central portion of the liquid crystal cell and a distance D 2 from a central portion of the rear-side polarizer to the central portion of the liquid crystal cell are different from each other, in which a ratio between an X value, and the distance D 1 and a Y value, and the distance D 2 rear-side polarizer is in a range of 1±0.12, a distance T 1 between the front-side polarizing plate and the liquid crystal cell is 40 μm or more, and a distance T 2 between the rear-side polarizing plate and the liquid crystal cell is in a range of 0 to 30 μm.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a front-side polarizing plate having at least a front-side polarizer;
a liquid crystal cell; and
a rear-side polarizing plate having at least a rear-side polarizer in this order,
wherein a distance D 1 from a central portion of the front-side polarizer in a thickness direction to a central portion of the liquid crystal cell in the thickness direction and a distance D 2 from a central portion of the rear-side polarizer in the thickness direction to the central portion of the liquid crystal cell in the thickness direction are different from each other,
a ratio between an X value which is computed by multiplying a thickness of the front-side polarizer, a modulus of elasticity of the front-side polarizer, a humidity dimensional change ratio of the front-side polarizer, and the distance D 1 and a Y value which is computed by multiplying a thickness of the rear-side polarizer, a modulus of elasticity of the rear-side polarizer, a humidity dimensional change ratio of the rear-side polarizer, and the distance D 2 is in a range of 1±0.12,
a distance T 1 from a surface of the front-side polarizer on a liquid crystal cell side to a surface of the liquid crystal cell on a front-side polarizer side in the front-side polarizing plate is 40 μm or more, and
a distance T 2 from a surface of the rear-side polarizer on a liquid crystal cell side to a surface of the liquid crystal cell on a rear-side polarizer side in the rear-side polarizing plate is in a range of 0 to 30 μm.

2. The liquid crystal display device according to claim 1 ,
wherein the front-side polarizing plate has a front-side inner functional layer between the front-side polarizer and the liquid crystal cell.

3. The liquid crystal display device according to claim 1 ,
wherein the rear-side polarizing plate has a rear-side inner functional layer between the rear-side polarizer and the liquid crystal cell.

4. The liquid crystal display device according to claim 1 ,
wherein, in the rear-side polarizing plate, the rear-side polarizer and the liquid crystal cell are adjacent to each other directly or via a pressure sensitive adhesive or an adhesive.

5. The liquid crystal display device according to claim 1 ,
wherein the front-side polarizing plate has a front-side outer polymer film on a side of the front-side polarizer opposite to the liquid crystal cell.

6. The liquid crystal display device according to claim 2 ,
wherein the front-side polarizing plate has a front-side outer polymer film on a side of the front-side polarizer opposite to the liquid crystal cell.

7. The liquid crystal display device according to claim 3 ,
wherein the front-side polarizing plate has a front-side outer polymer film on a side of the front-side polarizer opposite to the liquid crystal cell.

8. The liquid crystal display device according to claim 4 ,
wherein the front-side polarizing plate has a front-side outer polymer film on a side of the front-side polarizer opposite to the liquid crystal cell.

9. The liquid crystal display device according to claim 1 ,
wherein the rear-side polarizing plate has a rear-side outer polymer film on a side of the rear-side polarizer opposite to the liquid crystal cell.

10. The liquid crystal display device according to claim 2 ,
wherein the rear-side polarizing plate has a rear-side outer polymer film on a side of the rear-side polarizer opposite to the liquid crystal cell.

11. The liquid crystal display device according to claim 3 ,
wherein the rear-side polarizing plate has a rear-side outer polymer film on a side of the rear-side polarizer opposite to the liquid crystal cell.

12. The liquid crystal display device according to claim 4 ,
wherein the rear-side polarizing plate has a rear-side outer polymer film on a side of the rear-side polarizer opposite to the liquid crystal cell.

13. The liquid crystal display device according to claim 5 ,
wherein the rear-side polarizing plate has a rear-side outer polymer film on a side of the rear-side polarizer opposite to the liquid crystal cell.

14. The liquid crystal display device according to claim 1 ,
wherein the X value which is computed by multiplying the thickness of the front-side polarizer, the modulus of elasticity of the front-side polarizer, the humidity dimensional change ratio of the front-side polarizer, and the distance D 1 , the Y value which is computed by multiplying the thickness of the rear-side polarizer, the modulus of elasticity of the rear-side polarizer, the humidity dimensional change ratio of the rear-side polarizer, and the distance D 2 , and a Z value which is computed by multiplying a modulus of elasticity of a glass substrate in the liquid crystal cell and a total thickness of the glass substrate satisfy Expression (1) below:
X+Y< 0.034× Z   (1).

15. The liquid crystal display device according to claim 2 ,
wherein the X value which is computed by multiplying the thickness of the front-side polarizer, the modulus of elasticity of the front-side polarizer, the humidity dimensional change ratio of the front-side polarizer, and the distance D 1 , the Y value which is computed by multiplying the thickness of the rear-side polarizer, the modulus of elasticity of the rear-side polarizer, the humidity dimensional change ratio of the rear-side polarizer, and the distance D 2 , and a Z value which is computed by multiplying a modulus of elasticity of a glass substrate in the liquid crystal cell and a total thickness of the glass substrate satisfy Expression (1) below:
X+Y< 0.034× Z   (1).

16. The liquid crystal display device according to claim 3 ,
wherein the X value which is computed by multiplying the thickness of the front-side polarizer, the modulus of elasticity of the front-side polarizer, the humidity dimensional change ratio of the front-side polarizer, and the distance D 1 , the Y value which is computed by multiplying the thickness of the rear-side polarizer, the modulus of elasticity of the rear-side polarizer, the humidity dimensional change ratio of the rear-side polarizer, and the distance D 2 , and a Z value which is computed by multiplying a modulus of elasticity of a glass substrate in the liquid crystal cell and a total thickness of the glass substrate satisfy Expression (1) below:
X+Y< 0.034× Z   (1).

17. The liquid crystal display device according to claim 4 ,
wherein the X value which is computed by multiplying the thickness of the front-side polarizer, the modulus of elasticity of the front-side polarizer, the humidity dimensional change ratio of the front-side polarizer, and the distance D 1 , the Y value which is computed by multiplying the thickness of the rear-side polarizer, the modulus of elasticity of the rear-side polarizer, the humidity dimensional change ratio of the rear-side polarizer, and the distance D 2 , and a Z value which is computed by multiplying a modulus of elasticity of a glass substrate in the liquid crystal cell and a total thickness of the glass substrate satisfy Expression (1) below:
X+Y< 0.034× Z   (1).

18. The liquid crystal display device according to claim 5 ,
wherein the X value which is computed by multiplying the thickness of the front-side polarizer, the modulus of elasticity of the front-side polarizer, the humidity dimensional change ratio of the front-side polarizer, and the distance D 1 , the Y value which is computed by multiplying the thickness of the rear-side polarizer, the modulus of elasticity of the rear-side polarizer, the humidity

Assignees

• Fujifilm Corp

Inventors

• Satake Ryo
• Sekiguchi Megumi
• Ito Yoji
• Nakamura Ryo
• Inoue Rikio

Classifications

• G02F2001/133567

  Physics · mapped topic

• G02B5/30

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

• G02F1/133528 Primary

  Polarisers · CPC title

• G02F2202/28

  Adhesive materials or arrangements · CPC title

• G02F2001/133562

  Physics · mapped topic