LIQUID CRYSTAL PANEL AND MANUFACTURING METHOD THEREOF
The present invention relates to a liquid crystal panel and a method for manufacturing the same, and according to one aspect of the present invention, there is provided a liquid crystal panel comprising a liquid crystal cell having a first surface and a second surface opposite to the first surface, a first polarizing plate provided on the first surface and a second polarizing plate provided on the second surface, where each of the first and second polarizing plates includes a polarizer layer and a low moisture permeable base layer bonded to the polarizer layer, and a flexural balance between the first polarizing plate and the second polarizing plate is controlled by adjusting shrinkage force of the first polarizing plate and the second polarizing plate.
1 . A liquid crystal panel comprising:
a liquid crystal cell having a first surface and a second surface opposite to the first surface;
a first polarizing plate provided on the first surface; and
a second polarizing plate provided on the second surface,
wherein the first and second polarizing plates each comprise a polarizer layer and a low moisture permeable base layer bonded to the polarizer layer, and
wherein the liquid crystal panel satisfies Equation 1:
|α MD −α TD |≤1 [Equation 1]
wherein, α MD is a value determined by Equation 2 and α TD is a value determined by Equation 3:
α MD =(sum of absorption axial bending moments acting on each layer of the first polarizing plate)/(sum of transmission axial bending moments acting on each layer of the second polarizing plate) [Equation 2]
α TD =(sum of transmission axial bending moments acting on each layer of the first polarizing plate)/(sum of absorption axial bending moments acting on each layer of the second polarizing plate) [Equation 3]
wherein; the absorption axial bending moment acting on each layer is determined by the product of the distance from the center of the liquid crystal panel to the center of the relevant layer and the absorption axial shrinkage force acting on the relevant layer, and
wherein the transmission axial bending moment acting on each layer is determined by the product of the distance from the center of the liquid crystal panel to the center of the relevant layer and the transmission axial shrinkage force acting on the relevant layer.
2 . The liquid crystal panel according to claim 1 ,
wherein each of α MD and α TD is a value of 0.8 to 1.2.
3 . The liquid crystal panel according to claim 2 ,
Wherein each of α MD and α TD is a value of 0.85 to 1.15.
4 . The liquid crystal panel according to claim 1 ,
wherein each of α MD and α TD is 1.
5 . The liquid crystal panel according to claim 1 ,
wherein α MD and α TD have the same value.
6 . The liquid crystal panel according to claim 1 ,
wherein the liquid crystal panel satisfies Equation 4:
(α MD −1)(α TD −1)≤0. [Equation 4]
7 . The liquid crystal panel according to claim 1 ,
wherein the shrinkage force is determined based on a shrinkage ratio.
8 . The liquid crystal panel according to claim 1 ,
wherein the polarizer layer has an absorption axial shrinkage force of 5N to 9N when the polarizer layer is kept at 80° C. for 2 hours.
9 . The liquid crystal panel according to claim 1 ,
wherein the low moisture permeable base layer has a transmission axial shrinkage force of 3N to 10N when the low moisture permeable base layer is kept at 80° C. for 2 hours.
10 . The liquid crystal panel according to claim 1 ,
wherein the polarizer layer and the low moisture permeable base layer are bonded to each other via a UV adhesive layer.
11 . The liquid crystal panel according to claim 1 ,
wherein the numbers of layers constituting the first polarizing plate and the second polarizing plate, respectively, are the same.
12 . The liquid crystal panel according to claim 1 ,
wherein the numbers of layers constituting the first polarizing plate and the second polarizing plate, respectively, are different.
13 . A method for manufacturing a liquid crystal panel comprising:
attaching a first polarizing plate and a second polarizing plate to both surfaces of a liquid crystal cell, respectively,
wherein the first and second polarizing plates each comprise a polarizer layer and a low moisture permeable base layer bonded to the polarizer layer, and
wherein the method further comprises a step of producing the first and second polarizing plates so that the liquid crystal panel satisfies Equation 1:
|α MD −α TD |≤1 [Equation 1]
wherein, α MD is a value determined by Equation 2 and α TD is a value determined by Equation 3:
α MD =(sum of absorption axial bending moments acting on each layer of the first polarizing plate)/(sum of transmission axial bending moments acting on each layer of the second polarizing plate) [Equation 2]
α TD =(sum of transmission axial bending moments acting on each layer of the first polarizing plate)/(sum of absorption axial bending moments acting on each layer of the second polarizing plate) [Equation 3]
wherein the absorption axial bending moment acting on each layer is determined by the product of the distance from the center of the liquid crystal panel to the center of the relevant layer and the absorption axial shrinkage force acting on the relevant layer, and
wherein the transmission axial bending moment acting on each layer is determined by the product of the distance from the center of the liquid crystal panel to the center of the relevant layer and the transmission axial shrinkage force acting on the relevant layer.
14 . The method for manufacturing a liquid crystal panel according to claim 13 ,
wherein each of α MD and α TD is a value of 0.8 to 1.2.
15 . The method for manufacturing a liquid crystal panel according to claim 14 ,
wherein each of α MD and α TD is a value of 0.85 to 1.15.
16 . The method for manufacturing a liquid crystal panel according to claim 13 ,
wherein each of α MD and α TD is 1.
17 . The method for manufacturing a liquid crystal panel according to claim 13 ,
wherein the liquid crystal panel satisfies Equation 4:
(α MD −1)(α TD −1)≤0 [Equation 4]
18 . The method for manufacturing a liquid crystal panel according to claim 13 ,
wherein the polarizer layer has an absorption axial shrinkage force of 5N to 9N when the polarizer layer is kept at 80° C. for 2 hours.
19 . The method for manufacturing a liquid crystal panel according to claim 13 ,
wherein the low moisture permeable base layer has a transmission axial shrinkage force of 3N to 10N when the low moisture permeable base layer is kept at 80° C. for 2 hours.