Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10884279-B2
Application number	US-202016788755-A
Country	US
Kind code	B2
Filing date	Feb 12, 2020
Priority date	Feb 21, 2019
Publication date	Jan 5, 2021
Grant date	Jan 5, 2021

Abstract

A laminated film is provided between a transparent conductive film and a counter substrate so that the laminated film is in contact with the transparent conductive film and the counter substrate. The laminated film includes a first low refractive index layer, a first high refractive index layer, a second low refractive index layer, and a second high refractive index layer. In the direction from the transparent conductive film toward the counter substrate, the first low refractive index layer, the first high refractive index layer, the second low refractive index layer, and the second high refractive index layer are provided to exist in order of the first low refractive index layer, the first high refractive index layer, the second low refractive index layer, and the second high refractive index layer. Each of the first low refractive index layer and the second low refractive index layer is made of a first material. The refractive index of light of the first material is in the range of 1.4 to 1.6. Each of the first high refractive index layer and the second high refractive index layer is made of a second material. The refractive index of light of the second material is in the range of 1.9 to 2.1.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a liquid crystal panel of a lateral electric field drive system having a display surface being a surface on a viewing side; and
a transparent protective member configured to cover the display surface of the liquid crystal panel,
wherein the liquid crystal panel includes:
an array substrate; and
a counter substrate being a substrate on a viewing side, the counter substrate configured to face the array substrate,

a liquid crystal layer is sandwiched between the counter substrate and the array substrate,
the counter substrate has an outer front surface being a surface on a viewing side,
the liquid crystal panel further includes:
a laminated film provided on the outer front surface of the counter substrate; and
a transparent conductive film provided on the laminated film,

the transparent conductive film exists on the display surface side of the liquid crystal panel,
in the liquid crystal panel, a display region on which an image is displayed exists on the display surface side of the liquid crystal panel,
a light shielding film having an opening is provided in a rim portion of a surface covering the display surface of the transparent protective member,
the transparent protective member is stuck to the display surface of the liquid crystal panel via a transparent adhesive material,
in a plan view, the transparent conductive film covers the display region,
in a plan view, the transparent conductive film overlaps an outline of the opening of the light shielding film provided in the transparent protective member,
the opening is configured so that external light can reach the display region through the opening,
the laminated film as a lower layer of the transparent conductive film includes:
a first low refractive index layer made of a first material having a refractive index of light in a range of 1.4 to 1.6;
a first high refractive index layer made of a second material having a refractive index of light in a range of 1.9 to 2.1;
a second low refractive index layer made of the first material; and
a second high refractive index layer made of the second material, and

in a direction from the transparent conductive film toward the counter substrate, the first low refractive index layer, the first high refractive index layer, the second low refractive index layer, and the second high refractive index layer are provided to exist in order of the first low refractive index layer, the first high refractive index layer, the second low refractive index layer, and the second high refractive index layer.

2. The liquid crystal display device according to claim 1 , wherein
each of the first low refractive index layer and the second low refractive index layer is a film made of silicon dioxide, and
each of the first high refractive index layer and the second high refractive index layer is another transparent conductive film.

3. The liquid crystal display device according to claim 1 , wherein sheet resistance of the transparent conductive film is in a range of 100Ω/□ to 300 Ω/□.

4. The liquid crystal display device according to claim 1 , wherein a film thickness of the transparent conductive film is in a range of 10 nm to 30 nm.

5. The liquid crystal display device according to claim 1 , wherein
a film thickness of the first low refractive index layer is in a range of 30 nm to 65 nm,
a film thickness of the first high refractive index layer is in a range of 25 nm to 80 nm,
a film thickness of the second low refractive index layer is in a range of 15 nm to 60 nm, and
a film thickness of the second high refractive index layer is in a range of 10 nm to 30 nm.

Assignees

• Mitsubishi Electric Corp
• Geomatec Co Ltd

Inventors

• Kudo Yukihiro
• Miyayama Takashi
• Miyoshi Chihaya

Classifications

• G02F2202/22

  Antistatic materials or arrangements · CPC title

• G02F2201/503

  Arrangements improving the resistance to shock · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• G02F1/133331

  Cover glasses · CPC title