IP Library Granted Patent US 7,522,239
Granted Patent B2
US 7,522,239 · App. 11/608,057 · Granted Apr 21, 2009

Liquid crystal display

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Quick Facts
Patent No.
US 7,522,239
App. No.
11/608,057
Granted
Apr 21, 2009
Kind
B2
Abstract

A liquid crystal display comprises: first and second panels facing each other; a compensation film and a first polarizer disposed on the first panel, the compensation film having phase retardation characteristics; and a second polarizer having a supporting film disposed on the second panel, the supporting film having phase retardation characteristics. In alternative embodiments, a supporting film is used in place of the compensation film. The supporting film has retardation characteristics.

Claims (34)

1. A liquid crystal display device, comprising:

first and second panels facing each other;

a first polarizer having a first supporting film disposed on the first panel; and

a second polarizer having a second supporting film disposed on the second panel,

wherein phase retardation of the first supporting film ranges about 40 nm to about 60 nm in the horizontal direction and about 120 nm to about 160 nm in the vertical direction, and phase retardation of the second supporting film ranges about 0 nm to about 5 nm in the horizontal direction and about 100 nm to about 140 nm in the vertical direction.

2. The liquid crystal display device as in claim 1 , further comprising a liquid crystal layer for housing liquid crystals disposed between the first and the second panels.

3. The liquid crystal display device as in claim 2 , wherein the liquid crystals are aligned in a vertical alignment mode.

4. The liquid crystal display device as in claim 1 , wherein each of the polarizers includes a polarizing medium made of polyvinyl alcohol (PVA).

5. The liquid crystal display device as in claim 4 , wherein an elongation direction for the polarizing medium of the first polarizer having zero value of phase retardation in the horizontal direction is the same direction as an absorption axis of the first polarizer.

6. The liquid crystal display device as in claim 1 , wherein supporting films are thin films having different values for Nx, Ny, and Nz wherein Nx denotes the refractive index in the direction of major axis, Ny denotes the refractive index in the direction of minor axis, and Nz denotes the refractive index in the direction perpendicular to the major and minor axis.

7. The liquid crystal display device as in claim 1 , wherein an elongation direction for the first supporting film having non-zero value of phase retardation in the horizontal direction is the same direction as a phase retardation axis of the first supporting film and perpendicular to the absorption axis of the first polarizer.

8. A liquid crystal display device, comprising:

first and second panels facing each other;

a first polarizer having a first supporting film disposed on the first panel; and

a second polarizer having a second supporting film disposed on the second panel,

wherein the phase retardation of the first supporting film ranges about 50 nm to about 70 nm in the horizontal direction and about 210 nm to about 250 nm in the vertical direction, and the phase retardation of the second supporting film ranges about 0 nm to about 5 nm in the horizontal direction and about 50 nm to about 60 nm in the vertical direction.

9. The liquid crystal device of claim 8 , wherein the first polarizer further comprises a third supporting film providing substantially no phase retardation.

10. A method of forming panels in a liquid crystal display device, comprising:

positioning first and second panels to face each other;

disposing a first polarizer having a first supporting film on the first panel; and

disposing a second polarizer having a second supporting film on the second panel,

wherein phase retardation of the first supporting film ranges about 40 nm to about 60 nm in the horizontal direction and about 120 nm to about 160 nm in the vertical direction, and phase retardation of the second supporting film ranges about 0 nm to about 5 nm in the horizontal direction and about 100 nm to about 140 nm in the vertical direction.

11. The method as in claim 10 , further comprising disposing a liquid crystal layer for housing liquid crystals between the first and the second panels.

12. The method as in claim 11 , wherein the liquid crystals are aligned in a vertical alignment mode.

13. The method as in claim 10 , wherein each of the polarizers includes a polarizing medium made of polyvinyl alcohol (PVA).

14. The method as in claim 13 , wherein an elongation direction for the polarizing medium of the first polarizer having zero value of phase retardation in the horizontal direction is the same direction as an absorption axis of the first polarizer.

15. The method as in claim 10 , wherein the supporting films are thin films having different values for Nx, Ny, and Nz wherein Nx denotes the refractive index in the direction of major axis, Ny denotes the refractive index in the direction of minor axis, and Nz denotes the refractive index in the direction perpendicular to the major and minor axis.

16. The method as in claim 10 , wherein an elongation direction for the first supporting film having non-zero value of phase retardation in the horizontal direction is the same direction as a phase retardation axis of the first supporting film and perpendicular to the absorption axis of the first polarizer.

17. A method of forming panels in a liquid crystal display device, comprising:

positioning first and second panels to face each other;

disposing a first polarizer having a first supporting film on the first panel; and

disposing a second polarizer having a second supporting film on the second panel,

wherein the phase retardation of the first supporting film ranges about 50 nm to about 70 nm in the horizontal direction and about 210 nm to about 250 nm in the vertical direction, and the phase retardation of the second supporting film ranges about 0 nm to about 5 nm in the horizontal direction and about 50 nm to about 60 nm in the vertical direction.

18. The method of claim 17 , wherein the first polarizer further comprises a third supporting film providing substantially no phase retardation.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 17, 2012
From: SAMSUNG ELECTRONICS CO., LTD.
To: SAMSUNG DISPLAY CO., LTD.
Reel/Frame 029045/0860 →