Liquid crystal display
View Patent ↗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.
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, a first polarizing medium disposed on the first supporting film, and a second supporting film disposed on the first polarizing medium; and
a second polarizer having a third supporting film disposed on the second panel, a second polarizing medium disposed on the third supporting film, and a fourth supporting film disposed on the second polarizing medium, wherein the phase retardation of the third 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, wherein the first, second and fourth supporting films comprise triacetate cellulose (TAC).
2. The liquid crystal display device as in claim 1 , further comprising a liquid crystal layer disposed between the first and the second panels.
3. The liquid crystal display device as in claim 2 , wherein the liquid crystal layer is aligned in a vertical alignment mode.
4. The liquid crystal display device as in claim 3 , wherein the third supporting film is a thin film 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.
5. The liquid crystal display device as in claim 3 , wherein the first and second polarizing mediums are made of polyvinyl alcohol (PVA).
6. The liquid crystal display device as in claim 5 , wherein an elongation direction for the second polarizing medium having zero value of phase retardation in the horizontal direction is substantially the same direction with an absorption axis of the second polarizer disposed on the second panel.
7. The liquid crystal display device as in claim 6 , wherein an elongation direction for the third supporting film having non-zero value of phase retardation in the horizontal direction is substantially the same direction with a phase retardation axis of the third supporting film and perpendicular to the absorption axis of the second polarizer disposed on the second panel.
8. 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, a first polarizing medium on the first supporting film, and a second supporting film on the first polarizing medium; and
disposing a second polarizer having a third supporting film on the second panel, a second polarizing medium on the third supporting film, and a fourth supporting film on the second polarizing medium, wherein the phase retardation of the third 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, wherein the first, second and fourth supporting films comprise triacetate cellulose (TAC).
9. The method as in claim 8 , further comprising disposing a liquid crystal layer between the first and the second panels.
10. The method as in claim 9 , wherein the liquid crystal layer is aligned in a vertical alignment mode.
11. The method as in claim 10 , wherein the third supporting film is a thin film 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.
12. The method as in claim 11 , wherein the first and second polarizing mediums are made of polyvinyl alcohol (PVA).
13. The method as in claim 12 , wherein an elongation direction for the second polarizing medium having zero value of phase retardation in the horizontal direction is substantially the same direction with an absorption axis of the second polarizer disposed on the second panel.
14. The method as in claim 13 , wherein an elongation direction for the third supporting film having non-zero value of phase retardation in the horizontal direction is substantially the same direction with a phase retardation axis of the third supporting film and perpendicular to the absorption axis of the second polarizer disposed on the second panel.
15. A liquid crystal display device, comprising:
first and second panels facing each other; and
a first polarizer having a first supporting film directly disposed on the first panel and a second polarizer having a second supporting film directly disposed on the second panel, wherein the phase retardation of each of the first and second supporting films ranges about 40 nm to about 60 nm in the horizontal direction and about 120 nm to about 160 nm in the vertical direction, wherein the first and second supporting films are made of triacetate cellulose (TAC).