Image display device

Patent metadata

Field	Value
Publication number	US-2020264469-A1
Application number	US-201816348093-A
Country	US
Kind code	A1
Filing date	Jul 10, 2018
Priority date	Dec 14, 2017
Publication date	Aug 20, 2020
Grant date	—

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

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

• G02F1/133528

  Polarisers · 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

• G02F1/133605

  including specially adapted reflectors · CPC title