Image display device

Patent metadata

Field	Value
Publication number	US-10782574-B2
Application number	US-201816348093-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Dec 14, 2017
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

An image display device includes a first liquid crystal panel, a second liquid crystal panel which faces a rear surface of the first liquid crystal panel, and a backlight which irradiates a rear surface of the second liquid crystal panel with light. The first liquid crystal panel includes a first front polarizer on a front surface of the first liquid crystal panel, a first rear polarizer on the rear surface of the first liquid crystal panel, and a first liquid crystal cell between the first front and rear polarizers. The second liquid crystal panel includes a second front polarizer on a front surface of the second liquid crystal panel, a second rear polarizer disposed on the rear surface of the second liquid crystal pane, and smaller than the first rear polarizer in top view, and a second liquid crystal cell between the second front and rear polarizers.

First claim

The invention claimed is:

1. An image display device comprising:
a first liquid crystal panel which displays an image on a front surface of the first liquid crystal panel;
a second liquid crystal panel including a front surface facing a rear surface of the first liquid crystal panel; and
a backlight which irradiates a rear surface of the second liquid crystal panel with light, wherein
the first liquid crystal panel includes:
a first front polarizer which has a first transmission axis, and is disposed on the front surface of the first liquid crystal panel;
a first rear polarizer which has a second transmission axis extending in a direction different from the first transmission axis, and is disposed on the rear surface of the first liquid crystal panel; and
a first liquid crystal cell disposed between the first front polarizer and the first rear polarizer, and

the second liquid crystal panel includes:
a second front polarizer which has a third transmission axis extending in a same direction as the second transmission axis, and is disposed on the front surface of the second liquid crystal panel;
a second rear polarizer which is smaller than the first rear polarizer in top view, has a fourth transmission axis extending in a direction different from the third transmission axis, and is disposed on the rear surface of the second liquid crystal panel; and
a second liquid crystal cell disposed between the second front polarizer and the second rear polarizer.

2. The image display device according to claim 1 , wherein
the second liquid crystal cell includes:
a front transparent substrate which faces the second front polarizer;
a rear transparent substrate which faces the second rear polarizer;
a liquid crystal layer disposed between the front transparent substrate and the rear transparent substrate; and
a sealing material which is located between the front transparent substrate and the rear transparent substrate and seals a periphery of the liquid crystal layer, and

the second rear polarizer and the liquid crystal layer have a same size in top view.

3. The image display device according to claim 1 , further comprising:
a light guide plate which faces a periphery of the second liquid crystal panel, and guides, to the rear surface of the first liquid crystal panel, light coming from the backlight.

4. The image display device according to claim 1 , further comprising:
a reflecting member which faces a periphery of the second liquid crystal panel, and includes a reflecting surface to reflect, toward the rear surface of the first liquid crystal panel, light coming from the backlight.

5. The image display device according to claim 4 , wherein
the reflecting member is a fixing tape which is attached from a periphery of the first liquid crystal panel to the periphery of the second liquid crystal panel and includes the reflecting surface at least in a region facing the periphery of the second liquid crystal panel.

6. The image display device according to claim 1 , wherein
the second front polarizer is smaller than the first rear polarizer in the top view.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nakanishi Hirokazu
• Higashida Takashi

Classifications

• G02F1/133531

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

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title

• G02F1/13471 Primary

  in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence) · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title