Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-11150503-B2
Application number	US-201616060112-A
Country	US
Kind code	B2
Filing date	Dec 14, 2016
Priority date	Dec 17, 2015
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A liquid crystal display device including, sequentially in the following order: a light source unit, a rear side polarizer, a liquid crystal cell, a front side polarizer, and a viewing angle expansion film. Alternatively, a liquid crystal display device including, sequentially in the following order: a light source unit, a rear side polarizer, a liquid crystal cell, a viewing angle expansion film, and a front side polarizer. The liquid crystal display device optionally includes a rear side optical film provided between the rear side polarizer and the liquid crystal cell; and a front side optical film provided between the front side polarizer and the liquid crystal cell.

First claim

The invention claimed is:

1. A liquid crystal display device comprising, sequentially in the following order:
a light source unit, a rear side polarizer, a liquid crystal cell, a front side polarizer, and
a viewing angle expansion film, wherein
the liquid crystal cell is a VA mode liquid crystal cell,
the viewing angle expansion film has a hole-containing portion, and
a lengthwise direction of the hole-containing portion is parallel or perpendicular to the absorption axis of the front side polarizer.

2. The liquid crystal display device according to claim 1 , further comprising a hard coat layer on a front side surface of the viewing angle expansion film.

3. The liquid crystal display device according to claim 1 , wherein the viewing angle expansion film protects a front side surface of the front side polarizer.

4. The liquid crystal display device according to claim 1 , further comprising:
a rear side optical film provided between the rear side polarizer and the liquid crystal cell; and
a front side optical film provided between the front side polarizer and the liquid crystal cell, wherein
the rear side polarizer and the rear side optical film constitute a rear side circularly polarizing plate, and
the front side polarizer and the front side optical film constitute a front side circularly polarizing plate.

5. The liquid crystal display device according to claim 4 , wherein the rear side optical film, the front side optical film, or both thereof are a λ/4 plate.

6. The liquid crystal display device according to claim 4 , wherein an Nz factor of the rear side optical film, of the front side optical film, or of both of these films are such that Nz≥1.3.

7. The liquid crystal display device according to claim 1 , wherein the liquid crystal cell is an IPS mode liquid crystal cell.

8. The liquid crystal display device according to claim 1 , including a display surface of a rectangular shape, wherein
an absorption axis of the rear side polarizer or the front side polarizer is in a direction parallel or perpendicular to one edge of the display surface.

9. The liquid crystal display device according to claim 1 , wherein the liquid crystal cell is a TN mode liquid crystal cell.

10. The liquid crystal display device according to claim 9 , including a display surface of a rectangular shape, wherein
an absorption axis of the rear side polarizer or the front side polarizer is in a direction at about 45° or about 135° relative to one edge of the display surface.

11. The liquid crystal display device according to claim 1 , wherein the viewing angle expansion film includes, as the hole-containing portion, a plurality of hole-containing portions that are approximately parallel to each other.

12. The liquid crystal display device according to claim 1 , wherein the viewing angle expansion film includes two or more resin layers, and the hole-containing portion is provided on one or more of the resin layers.

13. The liquid crystal display device according to claim 1 , wherein the viewing angle expansion film is formed of a multi-layered film including a core layer, and has a craze, as the hole-containing portion, in the core layer.

14. The liquid crystal display device according to claim 1 , wherein in the viewing angle expansion film, adjacent ones of the hole-containing portions are disposed at random intervals of 50 μm or less, and the hole-containing portion has a width of 20 nm or more.

15. The liquid crystal display device according to claim 1 , wherein an azimuth angle at which tone reversal takes place upon observation of a screen of the display device in an oblique polar angle direction is a perpendicular angle with respect to the lengthwise direction of the hole-containing portion.

Assignees

• Zeon Corp

Inventors

• Yoshimi Hiroyuki
• Yamanaka Shunsuke

Classifications

• G02B5/3083 Primary

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02F2201/18

  parallel · CPC title

• G02F1/133504 Primary

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

• G02F1/133543

  Cholesteric polarisers · CPC title

• G02F1/133634

  the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis · CPC title