LIQUID CRYSTAL PANEL AND LIQUID CRYSTAL DISPLAY APPARATUS USING THE PANEL

• US 20100225854A1
• Filed: 01/26/2007
• Published: 09/09/2010
• Est. Priority Date: 02/20/2006
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Umemoto, Seiji, Yonezawa, Hideyuki, Kawamoto, Ikuo, Hada, Kazuya, Kamijou, Takashi, Kobayashi, Kentarou
• Application Number:
  US12/279,865
• Publication Number:
  US 20100225854A1
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: G02B 5/3083 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 Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133634 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 Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: G02F 2413/04 Number of plates greater than or equal to 4
• CPC Class Codes: G02F 2413/08 with a particular optical axis orientation
• CPC Class Codes: G02F 2413/13 Positive birefingence

Abstract

Provided are a liquid crystal panel which contributes to reduction in thickness and is excellent in optical properties and a liquid crystal display apparatus. The liquid crystal panel of the present invention includes a liquid crystal cell, a first polarizer disposed on one side of the liquid crystal cell, a second polarizer disposed on another side of the liquid crystal cell, a first optical compensation layer and a first negative C plate disposed between the first polarizer and the liquid crystal cell, and a second negative C plate and a second optical compensation layer disposed between the liquid crystal cell and the second polarizer, in which the first optical compensation layer is disposed between the first polarizer and the first negative C plate, the second optical compensation layer is disposed between the second negative C plate and the second polarizer, the first and second optical compensation layers each include a coating layer functioning as a λ/4 plate, and each have a thickness of 0.3 to 3 μm, and the first and second negative C plates each include a coating layer, and each have a thickness of 0.5 to 10 μm.

Claims

1. A liquid crystal panel, comprising:

a liquid crystal cell;

a first polarizer disposed on one side of the liquid crystal cell;

a second polarizer disposed on another side of the liquid crystal cell;

a first optical compensation layer and a first negative C plate disposed between the first polarizer and the liquid crystal cell; and

a second negative C plate and a second optical compensation layer disposed between the liquid crystal cell and the second polarizer, wherein;

the first optical compensation layer is disposed between the first polarizer and the first negative C plate and the second optical compensation layer is disposed between the second negative C plate and the second polarizer;

the first optical compensation layer and the second optical compensation layer each comprise a coating layer functioning as a λ

/4 plate, and each have a thickness of 0.3 to 3 μ

m; and

the first negative C plate and the second negative C plate each comprise a coating layer, and each have a thickness of 0.5 to 10 μ

m.

2. A liquid crystal panel according to claim 1, wherein the first negative C plate comprises a cholesteric alignment fixed layer.

3. A liquid crystal panel according to claim 1, wherein the first negative C plate comprises a coating layer including at least one kind of non-liquid crystal polymer selected from the group consisting of polyamide, polyimide, polyester, polyetherketone, polyamideimide, and polyesterimide.

4. A liquid crystal panel according to claim 1, wherein the second negative C plate comprises a cholesteric alignment fixed layer.

5. A liquid crystal panel according to claim 1, wherein the second negative C plate comprises a coating layer including at least one kind of non-liquid crystal polymer selected from the group consisting of polyamide, polyimide, polyester, polyetherketone, polyamideimide, and polyesterimide.

6. A liquid crystal panel according to claim 1, wherein a slow axis of the first optical compensation layer defines an angle of +40°

to +50°

or −

40°

to −

50°

with respect to an absorption axis of the first polarizer.

7. A liquid crystal panel according to claim 1, wherein a slow axis of the second optical compensation layer defines an angle of +40°

to +50°

or −

40°

to −

50°

with respect to an absorption axis of the second polarizer.

8. A liquid crystal panel according to claim 1, further comprising a protective layer on at least one side of the first polarizer.

9. A liquid crystal panel according to claim 1, further comprising a protective layer on at least one side of the second polarizer.

10. A liquid crystal panel according to claim 1, wherein the first optical compensation layer and the first negative C plate are disposed through a first adhesion layer.

11. A liquid crystal panel according to claim 1, wherein the second optical compensation layer and the second negative C plate are disposed through a second adhesion layer.

12. A liquid crystal panel according to claim 1, wherein the liquid crystal cell is a VA mode of a transmission function or a semi-transmission function.

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