Liquid crystal display device

• US 6,995,824 B2
• Filed: 11/24/2004
• Issued: 02/07/2006
• Est. Priority Date: 02/25/2003
• Status: Expired due to Fees

• Current Assignee: Toshiba Matsushita Display Technology (Japan Display Incorporated)
• Original Assignee: Toshiba Matsushita Display Technology (Japan Display Incorporated)
• Inventors: Joten, Kazuhiro
• Primary Examiner(s): NGO, HUYEN LE
• Application Number:
  US10/995,495
• Publication Number:
  US 20050073635A1
• Time in Patent Office: 440 Days
• Field of Search: 349/117, 349/96, 349/119, 349/179, 349/186
• US Class Current: 349/119
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/1396 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell G02F1/141 takes precedence
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation
• CPC Class Codes: G02F 2413/02 Number of plates being 2

Abstract

A liquid crystal display device includes a liquid crystal panel, a polarizer plate that is disposed on an observer side, relative to the liquid crystal panel, a polarizer plate that is disposed to be opposed to the polarizer plate, with the liquid crystal panel interposed, and an optical film that is disposed between the polarizer plate and the liquid crystal panel and between the polarizer plate and the liquid crystal panel, thereby to increase a viewing angle of an image that is displayed by the liquid crystal panel, wherein a twist angle of the liquid crystal molecules sealed in the liquid crystal panel is greater than 90° and not greater than 96°, a retardation Δnd of the liquid crystal panel is between 400 nanometers (nm) and 430 nm, and a retardation Δnd of the optical film is between 110 nm and 120 nm.

Claims

1. A liquid crystal display device comprising:

a liquid crystal panel that is configured such that liquid crystal molecules are sealed between two glasses;

a first polarizer plate that is disposed on an observer side, relative to the liquid crystal panel;

a second polarizer plate that is disposed to be opposed the first polarizer plate, with the liquid crystal panel interposed; and

an optical film that is disposed at least between the first polarizer plate and the liquid crystal panel or between the second polarizer plate and the liquid crystal panel, thereby to increase a viewing angle of an image that is displayed by the liquid crystal panel,

wherein a twist angle of the liquid crystal molecules sealed in the liquid crystal panel is greater than 90° and

not greater than 96°

,

a retardation Δ

nd of the liquid crystal panel is between 400 nanometers (nm) and 430 nm, and

a retardation Δ

nd of the optical film is between 110 nm and 120 nm.

2. The liquid crystal display device according to claim 1, wherein a ratio of a vertical viewing angle to a horizontal viewing angle is 1.25 or more.

3. The liquid crystal display device according to claim 1, wherein the optical film is disposed between the first polarizer plate and the liquid crystal panel and between the second polarizer plate and the liquid crystal panel.

4. The liquid crystal display device according to claim 1, further comprising a backlight supply unit that is provided on that side of the second polarizer plate, which is opposed to the liquid crystal panel, thereby to supply backlight to the liquid crystal molecules sealed in the liquid crystal panel.

5. A mobile communication apparatus comprising:

a main body; and

a display unit that is provided on the main body, thereby to display information,

wherein the display unit includes the liquid crystal display device according to claim 1.