Liquid crystal panel and liquid crystal display apparatus using the same

• US 8,072,567 B2
• Filed: 12/04/2007
• Issued: 12/06/2011
• Est. Priority Date: 12/25/2006
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Shutou, Shunsuke, Bitou, Masato, Ishihara, Youji
• Primary Examiner(s): Ullah, Akm
• Application Number:
  US12/519,036
• Publication Number:
  US 20090268137A1
• Time in Patent Office: 1,463 Days
• Field of Search: 349/96, 349/115, 349/116, 349/117, 349/118, 349/119
• US Class Current: 349/118
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation
• CPC Class Codes: G02F 2413/02 Number of plates being 2
• CPC Class Codes: G02F 2413/12 Biaxial compensators

Abstract

A liquid crystal panel of the present invention includes in the following order toward a viewer side: a first polarizer; a first optical compensation layer having a refractive index ellipsoid of nx>ny>nz and an in-plane retardation Re₁ of 90 to 300 nm; a liquid crystal cell; a second optical compensation layer having a refractive index ellipsoid of nx>ny>nz and an in-plane retardation Re₂ of 90 to 300 nm; and a second polarizer, wherein a total thickness direction retardation ΣRth_{1 to n} of all the optical compensation layers and a thickness direction retardation Rth_c of the liquid crystal cell satisfy the following Expression (1):
−160 nm<(ΣRth_{1 to n}−Rth_c)<50 nm  (1).

Claims

1. A liquid crystal panel, comprising, in the following order toward a viewer side:

a first polarizer;

a first optical compensation layer having a refractive index ellipsoid of nx>

ny>

nz and an in-plane retardation Re₁ of 90 to 300 nm;

a liquid crystal cell;

a second optical compensation layer having a refractive index ellipsoid of nx>

ny>

nz and an in-plane retardation Re₂ of 90 to 300 nm; and

a second polarizer,

wherein a total thickness direction retardation Σ

Rth_{1 to n} of all the optical compensation layers and a thickness direction retardation Rth_c of the liquid crystal cell satisfy the following Expression (1);

−

160 nm<

(Σ

Rth_{1 to n}−

Rth_c)<

50 nm 

 

(1).

2. A liquid crystal panel according to claim 1, wherein the total thickness direction retardation Σ

Rth_{1 to n} of all the optical compensation layers and the thickness direction retardation Rth_c of the liquid crystal cell satisfy the following Expression (2);

−

160 nm<

(Σ

Rth_{1 to n}−

Rth_c)<

20 nm 

 

(2).

3. A liquid crystal panel according to claim 1, wherein the liquid crystal cell is in a VA mode.

4. A liquid crystal display apparatus comprising the liquid crystal panel according to claim 1.

5. A liquid crystal panel according to claim 2, wherein the liquid crystal cell is in a VA mode.

6. A liquid crystal display apparatus comprising the liquid crystal panel according to claim 2.

7. A liquid crystal display apparatus comprising the liquid crystal panel according to claim 5.