Liquid crystal module and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10401693-B2
Application number	US-201715473111-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Jul 29, 2016
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A liquid crystal module which is disposed opposite a backlight includes: a first liquid crystal panel which includes a pair of first transparent substrates; a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and a diffuser sheet disposed therebetween. A first transparent substrate that is closer to the diffuser sheet among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser sheet among the pair of second transparent substrates.

First claim

The invention claimed is:

1. A liquid crystal module which is disposed opposite a backlight, the liquid crystal module comprising:
a first liquid crystal panel which includes a pair of first transparent substrates;
a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and
a diffuser disposed between the first liquid crystal panel and the second liquid crystal panel, the diffuser including a first diffuser sheet and a second diffuser sheet, the second diffuser sheet disposed closer to the second liquid crystal panel than the first diffuser sheet, and the first diffuser sheet being thinner than the second diffuser sheet and having a greater degree of diffusion than the second diffuser sheet.

2. The liquid crystal module according to claim 1 , wherein
a first transparent substrate that is closer to the diffuser among the pair of first transparent substrates has a thickness that is at most 5/7 of a thickness of a second transparent substrate that is closer to the diffuser among the pair of second transparent substrates.

3. The liquid crystal module according to claim 1 , wherein
the first liquid crystal panel includes a first black matrix in which first openings are formed in a matrix, the first black matrix being disposed between the pair of first transparent substrates,
the second liquid crystal panel includes a second black matrix in which second openings are formed in a matrix, the second black matrix being disposed between the pair of second transparent substrates, and
the diffuser is disposed closer to the first black matrix than the second black matrix.

4. The liquid crystal module according to claim 1 , wherein
a first transparent substrate that is farther from the diffuser among the pair of first transparent substrates, a second transparent substrate that is closer to the diffuser among the pair of second transparent substrates, and a second transparent substrate that is farther from the diffuser among the pair of second transparent substrates have substantially a same thickness.

5. The liquid crystal module according to claim 1 , further comprising:
a pair of first polarizers sandwiching the pair of first transparent substrates and disposed so that polarization directions of the first polarizers are perpendicular to each other; and
a pair of second polarizers sandwiching the pair of second transparent substrates and disposed so that polarization directions of the second polarizers are perpendicular to each other, wherein
a first polarizer that is closer to the diffuser among the pair of first polarizers is thinner than a second polarizer that is closer to the diffuser among the pair of second polarizers.

6. The liquid crystal module according to claim 5 , wherein
a phase retarder is attached to one surface of a first polarizer that is farther from the diffuser among the pair of first polarizers.

7. The liquid crystal module according to claim 1 , wherein
the first liquid crystal panel displays a color image, and
the second liquid crystal panel displays a monochrome image.

8. A liquid crystal display device, comprising:
the liquid crystal module according to claim 1 ; and
a backlight.

9. The liquid crystal module according to claim 1 , further comprising:
a pair of first polarizers sandwiching the pair of first transparent substrates, the pair of first polarizers disposed so that polarization directions of the first polarizers are perpendicular to each other; and
a pair of second polarizers sandwiching the pair of second transparent substrates, the pair of second polarizers disposed so that polarization directions of the second polarizers are perpendicular to each other, wherein
the first diffuser sheet is attached to a first polarizer that is closer to the diffuser among the pair of first polarizers, and
the second diffuser sheet is attached to a second polarizer that is closer to the diffuser among the pair of second polarizers.

10. The liquid crystal module according to claim 1 , wherein
a first transparent substrate that is closer to the diffuser among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser among the pair of second transparent substrates.

Assignees

• Panasonic Liquid Crystal Displ

Inventors

• Kikuchi Katsuhiro
• Tsuda Kazuhiko
• Imaoku Takao
• Yasui Yoichi

Classifications

• 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

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/1347

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/133512

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