阅读说明：本技术 液晶面板及其制造方法 (Liquid crystal panel and method for manufacturing same ) 是由 金癸成 李应淇 金暎坤 李铉洙 金唯彬 金建佑 金泳台 于 2018-07-16 设计创作，主要内容包括：本发明涉及液晶面板及其制造方法,根据本发明的一个方面,提供了液晶面板,其包括具有第一表面和与第一表面相反的第二表面的液晶单元、设置在第一表面上的第一偏光板和设置在第二表面上的第二偏光板,其中第一偏光板和第二偏光板各自包括起偏振器层和结合至起偏振器层的低透湿性基材层,并且通过调节第一偏光板和第二偏光板的收缩力来控制第一偏光板与第二偏光板之间的挠曲平衡。(According to one aspect of the present invention, there is provided a liquid crystal panel including a liquid crystal cell having a first surface and a second surface opposite to the first surface, a first polarizing plate disposed on the first surface, and a second polarizing plate disposed on the second surface, wherein the first polarizing plate and the second polarizing plate each include a polarizer layer and a low moisture-permeable base material layer bonded to the polarizer layer, and a deflection balance between the first polarizing plate and the second polarizing plate is controlled by adjusting a contraction force of the first polarizing plate and the second polarizing plate.)

1. A liquid crystal panel includes a liquid crystal cell having a first surface and a second surface opposite to the first surface; a first polarizing plate disposed on the first surface; and a second polarizing plate disposed on the second surface, wherein the first polarizing plate and the second polarizing plate each include a polarizer layer and a low moisture permeability base material layer bonded to the polarizer layer, and the liquid crystal panel satisfies the following equation 1:

[ equation 1]

|α_MD-α_TD|≤1

In the case of the equation 1, the,_MDis a value determined by equation 2, and_TDfor the value determined by equation 3:

[ equation 2]

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 3]

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)

In equations 2 and 3, the absorbed 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 absorbed axial contraction force acting on the relevant layer, and

the transmissive 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 transmissive axial shrinkage force acting on the relevant layer.

2. The liquid crystal panel according to claim 1,

α therein_MDAnd α_TDEach 0.8 to 1.2.

3. The liquid crystal panel according to claim 2,

α therein_MDAnd α_TDEach 0.85 to 1.15.

4. The liquid crystal panel according to claim 1,

α therein_MDAnd α_TDEach is 1.

5. The liquid crystal panel according to claim 1,

α therein_MDAnd α_TDHave the same value.

6. The liquid crystal panel according to claim 1,

the following equation 4 is satisfied:

[ equation 4]

(α_MD-1)(α_TD-1)≤0。

7. The liquid crystal panel according to claim 1,

wherein the contraction force is determined based on a contraction rate.

8. The liquid crystal panel according to claim 1,

wherein the polarizer layer has an absorption axial contraction force of 5N to 9N when held at 80 ℃ for 2 hours.

9. The liquid crystal panel according to claim 1,

wherein when the low moisture-permeable base material layer is held at 80 ℃ for 2 hours, the low moisture-permeable base material layer has a transmission axial contractive force of 3N to 10N.

10. The liquid crystal panel according to claim 1,

wherein the polarizer layer and the low moisture permeability base material layer are bonded to each other via a UV adhesive layer.

11. The liquid crystal panel according to claim 1,

wherein the number of layers constituting the first polarizing plate and the second polarizing plate, respectively, is the same.

12. The liquid crystal panel according to claim 1,

wherein the number of layers constituting the first polarizing plate and the second polarizing plate, respectively, is different.

13. A method for manufacturing a liquid crystal panel by attaching a first polarizing plate and a second polarizing plate to both surfaces of a liquid crystal cell, respectively,

wherein the first polarizing plate and the second polarizing plate each comprise a polarizer layer and a low moisture permeability base material layer bonded to the polarizer layer, an

The method includes the step of producing the first polarizing plate and the second polarizing plate to satisfy the following equation 1:

[ equation 1]

|α_MD-α_TD|≤1

In equation 1, α_MDIs the value determined by equation 2, and α_TDFor the value determined by equation 3:

[ equation 2]

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 3]

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)

In equations 2 and 3, the absorbed 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 absorbed axial contraction force acting on the relevant layer, and

the transmissive 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 transmissive axial shrinkage force acting on the relevant layer.

14. The method for manufacturing a liquid crystal panel according to claim 13,

α therein_MDAnd α_TDEach 0.8 to 1.2.

15. The method for manufacturing a liquid crystal panel according to claim 14,

α therein_MDAnd α_TDEach 0.85 to 1.15.

16. The method for manufacturing a liquid crystal panel according to claim 13,

α therein_MDAnd α_TDEach is 1.

17. The method for manufacturing a liquid crystal panel according to claim 13,

the following equation 4 is satisfied:

[ equation 4]

(α_MD-1)(α_TD-1)≤0。

18. The method for manufacturing a liquid crystal panel according to claim 13,

wherein the polarizer layer has an absorption axial contraction force of 5N to 9N when held at 80 ℃ for 2 hours.

19. The method for manufacturing a liquid crystal panel according to claim 13,

wherein when the low moisture-permeable base material layer is held at 80 ℃ for 2 hours, the low moisture-permeable base material layer has a transmission axial contractive force of 3N to 10N.

Technical Field

The invention relates to a liquid crystal panel and a manufacturing method thereof.

This application claims rights based on priority from korean patent application No. 10-2017-.

Background

A liquid crystal display device is a display that visualizes polarized light due to a conversion effect of liquid crystal, and is used in various categories from small-sized displays such as computers, notebook computers, electronic watches, and portable terminals to large-sized TVs.

A large number of polarizing plates, which have been mass-produced at present and are actually used for display devices, are polarizing plates obtained by bonding protective films, which are optically transparent and also have mechanical strength, to both sides or one side of a polarizing film (polarizer) formed by dyeing a polyvinyl alcohol-based film with iodine or a dichroic material such as a dichroic dye and crosslinking the film with a boron compound, followed by stretching and orientation.

However, the stretched polyvinyl alcohol-based film has a problem that shrinkage deformation easily occurs under durable conditions such as high temperature and high humidity. If the polarizer is deformed, the stress affects the protective film and the liquid crystal cell to cause warpage, and thus the following problems occur: such as a change in physical characteristics of a polarizing plate including the same and a light leakage phenomenon in a liquid crystal display device.

Disclosure of Invention

Technical problem

The problem to be solved by the invention is to provide a liquid crystal panel and a manufacturing method thereof, wherein the deflection balance of an upper polarizer and a lower polarizer can be adjusted by adjusting the contraction force of the polarizers.

Technical scheme

In order to solve the above problems, there is provided a liquid crystal panel including a liquid crystal cell having a first surface and a second surface opposite to the first surface; a first polarizing plate disposed on the first surface; and a second polarizing plate disposed on the second surface, wherein the first polarizing plate and the second polarizing plate each include a polarizer layer and a low moisture permeability base material layer bonded to the polarizer layer, and the liquid crystal panel satisfies the following equation 1.

[ equation 1]

|α_MD-α_TD|≤1

In equation 1, MD is a value determined by equation 2, and TD is a value determined by equation 3:

[ equation 2]

α_MD(sum of absorption axial bending moment) acting on each layer of the first polarizing plate)/(sum of transmission axial bending moment (transmission axial bending moment) acting on each layer of the second polarizing plate)

[ equation 3]

α_TD(sum of transmitted axial bending moments acting on the respective layers of the first polarizing plate)/(sum of absorbed axial bending moments acting on the respective layers of the second polarizing plate)

In equations 2 and 3, 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 contraction force acting on the relevant layer, and

the transmissive 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 transmissive axial contraction force acting on the relevant layer.

Advantageous effects

As described above, the liquid crystal panel and the method of manufacturing the same relating to at least one embodiment of the present invention have the following effects.

The deflection balance of the upper/lower polarizing plates can be adjusted by adjusting the contraction force of the polarizing plates.

In addition, cracks of the polarizing plate can be prevented, and a light leakage phenomenon of the liquid crystal display device can be prevented.

Drawings

Fig. 1 is a schematic sectional view showing a liquid crystal panel.

Fig. 2 shows the result of the evaluation of the bending of the polarizing plate.

Fig. 3 is a conceptual diagram for explaining equations 1 and 2.

Detailed Description

Hereinafter, a liquid crystal panel and a method of manufacturing the same according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In addition, the same or similar reference numerals are given to the same or corresponding parts regardless of the reference numerals, redundant description thereof will be omitted, and the size and shape of each constituent element shown may be enlarged or reduced for convenience of description.

Fig. 1 is a schematic sectional view showing a liquid crystal panel 10.

Further, fig. 2 shows the result of the bending evaluation of the polarizing plate, and fig. 3 is a conceptual diagram for explaining equations 1 and 2.

Referring to fig. 1, a liquid crystal panel 10 related to one embodiment of the present invention includes a liquid crystal cell 100 having a first surface 101 and a second surface 102 opposite to the first surface 101, a first polarizing plate 200 disposed on the first surface 101, and a second polarizing plate 300 disposed on the second surface 102.

In addition, the first and second polarizing plates 200 and 300 include polarizer layers 210 and 310 and low moisture permeability base material layers 220 and 320 bonded to the polarizer layers 210 and 310, respectively. In addition, in the first and second polarizing plates 200 and 300, the polarizer layers 210 and 310 and the low moisture-permeable base material layers 220 and 320 may be bonded via the UV adhesive layers 230 and 330. When the first polarizing plate 200 and the second polarizing plate 300 are bonded to the liquid crystal cell 100, the first polarizing plate 200 and the second polarizing plate 300 are each bonded to the liquid crystal cell 100 such that the polarizer layers 210, 310 are adjacent to the liquid crystal cell 100 as compared to the low moisture-permeable base material layers 220, 320.

In this document, the MD direction indicates the absorption axis direction, and the TD direction indicates the transmission axis direction.

In addition, the first and second polarizing plates 200 and 300 may include protective layers 240 and 340 and adhesive layers 250 and 350, respectively. The polarizing plates 200, 300 may be each bonded to the liquid crystal cell 100 via adhesive layers 250, 350. Further, in the liquid crystal panel 10, the low moisture permeability base material layer 220, 320 is located on the outside. The thickness of each of the first and second polarizing plates 200 and 300 may be 200 μm or less.

Further, the polarizer layers 210, 310 may each have a first surface and a second surface opposite the first surface. Here, the first surface indicates a surface facing the liquid crystal cell 100. The UV adhesive layers 230, 330 are each disposed on the second surfaces of the polarizer layers 210, 310, and the low moisture permeability base material layer 220, 320 is disposed on the UV adhesive layers 230, 330. Further, the protective layers 240, 340 are each disposed on the first surfaces of the polarizer layers 210, 310, and the pressure sensitive adhesive layers 250, 350 are disposed on the protective layers 240, 340.

Further, the low moisture permeability base material layer 220, 320 may be formed of a resin material having a transmittance of 90% or more, may have a thickness of 100 μm or less, and may have a thickness of 50g/m²Moisture permeability of days or less. Moisture permeability means the amount of moisture passed per unit time and unit area by a certain external environment, which can be generally measured at 40 ℃ in an environment where the difference in humidity between the inside and outside of the film is 90%, and moisture permeability described herein is the result measured by a WVTR instrument (instrument name: WVTR TSY-T3) from Labthink. The instrument has a structure in which it is to be placed in a closed chamber, and the environment in the chamber is maintained at 40 ℃ and 10% humidity. Further, water was poured into the moisture permeable cup, and then the low moisture permeability substrate film was covered and fixed thereon. Because the cup is filled with water, the humidity inside the moisture permeable cup is 100 percentThe difference in humidity between the inside and the outside of the moisture permeable cup becomes 90%. After 24 hours, the weight of the moisture permeable cup may be measured to calculate the amount of evaporated water by the difference from the initial weight.

Further, the low moisture permeability base material layer 220, 320 may be formed of Polyester (PET). Further, the low moisture-permeable base material layer 220, 320 may have a TD-direction shrinkage force of 3N to 10N, and may have a TD-direction shrinkage force of more than 3N and less than 10N.

On the other hand, the shrinkage force can be measured by a DMA measurement instrument from TA Corporation. For example, the measurement instrument has no temperature acceleration conditions, starts at 25 ℃, reaches 75 ℃ after 3 minutes, and stabilizes at 80 ℃ after 7 minutes. The measurement time was 2 hours (120 minutes), and 120 minutes after stabilization at 80 ℃. In the measurement method, the sample was clamped to a jig, pulled and fixed to maintain the strain at 0.1% under a preload of 0.01N, and then the shrinkage force applied while maintaining the strain at 0.1% at a high temperature was measured. The sample was made to have a width of about 5.3mm and a length of about 15mm, both ends of the sample in the longitudinal direction were fixed to the grips of the measuring instrument, and then the contraction force was measured. Here, the sample length of 15mm is a length excluding a portion fixed to the jig.

Referring to fig. 2 and tables 1 and 2, the substrates a to C constitute a low moisture-permeable substrate layer, which is a low moisture-permeable substrate differing in only TD heat shrinkage characteristics and having the same other characteristics. At this time, the shrinkage force was data measured at 80 ℃ for 2 hours using a DMA measuring instrument from TA Corporation.

The polarizer layer and the low moisture permeability base material layer used in categories 1 to 5 of table 2 and fig. 2 are as follows. In categories 1 to 5, the polarizer layers are all the same, and the low moisture permeability base material layers have a difference only in the TD-direction shrinkage force.

For the polarizing plates (upper polarizing plate and lower polarizing plate), a PET film (MD shrink force: 0N to 1N, TD shrink force: 4N to 12N (categories 1 to 5), thickness: 80 μm) as a low moisture-permeable base material layer was attached to one side of a PVA polarizing film (MD shrink force: 8N, thickness: 17 μm) as a polarizer layer using an epoxy compound-based uv-curable adhesive (thickness: 2 μm to 3 μm). At the time of attachment, the TD direction of the PET film and the MD direction (absorption axis direction) of the PVA polarizing film are attached so as to be substantially perpendicular to each other. Subsequently, a hard coat layer was formed to a thickness of about 5 to 7 μm on the surface of the PVA polarizing film to which the PET film was not attached, using a material containing an epoxy compound and an oxetane compound. Thereafter, an acrylic pressure-sensitive adhesive layer having a thickness of about 25 μm was formed in the lower portion of the hard coat layer to produce a polarizing plate.

The upper polarizing plate was attached to the upper surface of a general 32-inch LCD (liquid crystal display) panel (liquid crystal cell, thickness: about 400 μm) by a pressure-sensitive adhesive layer, and the lower polarizing plate was attached to the lower surface by a pressure-sensitive adhesive layer.

Subsequently, the LCD panel was introduced into a chamber at a temperature of 60 ℃ for 72 hours, taken out, and the panel change amounts at an elapsed time of 2 hours and an elapsed time of 24 hours were measured and summarized in the following table 3, the result of which is depicted in fig. 1 (flatness after 24 hours). In the following table 3, the term flatness is a difference between a portion of the liquid crystal panel most bent toward the upper polarizing plate (e.g., a first polarizing plate) and a portion most bent toward the lower polarizing plate (e.g., a second polarizing plate), and the flatness may be determined by using a known three-dimensional measuring machine (Dukin co., Ltd.).

[ Table 1]

[ Table 2]

	Drying conditions
		α	X
β	Tg+20℃
		γ	Tg+30℃

In [ table 2], α of the drying conditions indicates a case where drying is not performed, β indicates a case where drying is performed at a temperature of Tg +20 ℃, and γ indicates a case where drying is performed at a temperature of Tg +30 ℃.

In summary, the shape of the flatness varies depending on the base material having different TD heat shrinkage characteristics of the low moisture-permeable base material layer, wherein it can be confirmed that the flatness is improved when the TD heat shrinkage characteristics are further controlled by changing the drying temperature conditions.

Further, the polarizer layers 210, 220 may have a thickness of less than 25 μm, a degree of polarization of 99% or more, and a transmittance of 40% or more, and may be formed of PVA. Further, the MD direction shrinkage force of the polarizer layers 210, 220 may be 5N to 9N. Further, the MD direction shrink force of the polarizer layers 210, 220 may be greater than 5N and less than 9N. The polarizer layers 210, 220 are provided by stretching them in the MD direction, and when the MD shrinkage force has a value greater than the above range, there is a high possibility that heat-resistant cracks are generated.

On the other hand, the thickness of the UV adhesive layer 230, 330 may be 1 μm to 4 μm, and the thickness of the protective layer 240, 340 may be 3 μm to 9 μm.

In this document, the MD direction (absorption axis direction) represents the machine direction, the TD direction (transmission axis direction) represents the transverse direction, and the MD direction and the TD direction are orthogonal to each other.

Further, in a state where the first polarizing plate 200 and the second polarizing plate 300 are respectively attached to both surfaces of the liquid crystal cell 100, the MD direction of the first polarizing plate 200 is the same as the TD direction of the second polarizing plate, and the TD direction of the first polarizing plate 200 is the same as the MD direction of the second polarizing plate.

In addition, the number of layers respectively constituting the first polarizing plate 200 and the second polarizing plate 300 may be the same. For example, the first polarizing plate 200 and the second polarizing plate 300 may have the same layer structure.

Alternatively, the number of layers constituting the first polarizing plate 200 and the second polarizing plate 300, respectively, may be different. For example, the first polarizing plate 200 and the second polarizing plate 300 may have different layer structures. In addition, the first and second polarizing plates 200 and 300 may also have different thicknesses.

Referring to fig. 3, the liquid crystal panel 10 satisfies the following equation 1.

[ equation 1]

|α_MD-α_TD|≤1

In equation 1, α_MDα for the value determined by equation 2_TDFor the value determined by equation 3:

[ equation 2]

α_MD(sum of absorption axial bending moment acting on each layer of the first polarizing plate)/(sum of transmission axial bending moment acting on each layer of the second polarizing plate)

[ equation 3]

α_TD(sum of transmitted axial bending moments acting on the respective layers of the first polarizing plate)/(sum of absorbed axial bending moments acting on the respective layers of the second polarizing plate)

In equations 2 and 3, the absorption axial bending moment acting on each layer is determined by the product of the distance (unit: μm) from the center of the liquid crystal panel to the center of the relevant layer and the absorption axial contraction force (unit: N) acting on the relevant layer.

Further, the transmissive axial bending moment acting on each layer is determined by the product of the distance (unit: μm) from the center of the liquid crystal panel to the center of the relevant layer and the transmissive axial contraction force (unit: N) acting on the relevant layer.

In this document, the center of the liquid crystal panel means the center of the total thickness of the liquid crystal cell 100, the first polarizing plate 200, and the second polarizing plate 300. For example, when the first polarizing plate 200 and the second polarizing plate 300 have the same thickness, the center of the liquid crystal panel may be the center of the liquid crystal cell, as shown in fig. 3 (a). Alternatively, when the first and second polarizing plates 200 and 300 have different thicknesses, the center of the liquid crystal panel does not coincide with the center of the liquid crystal cell.

Further, α defined by equations 2 and 3_MDAnd α_TDEach 0.8 to 0.12.

That is, for each of the orthogonal directions (MD, TD), the ratio of the bending moment acting on the first polarizing plate 200 to the bending moment acting on the second polarizing plate 300 may be 0.8 to 1.2, respectively. Therefore, the flexure balance of the liquid crystal panel 10 can be controlled.

Furthermore, α is preferable_MDAnd α_TDEach 0.85 to 1.15, and preferably, α_MDAnd α_TDEach is 1.

Therefore, in the above equation 1, preferably, | α_MD–α_TDThe value of | may be 0.4 or less, more preferably, | α_MD–α_TDThe value of | may be 0.3 or less.

In addition, α_MDAnd α_TDMay have the same value.

[ Table 3]

Table 3 is based on room temperature data after a duration of 72 hours at 60 ℃ and shows that when the bending moment of the polarizer layer is constant, it is adjusted so that α is controlled by controlling the TD-direction bending moment of the low moisture-permeable base material layers (base materials 1 to 4)_MDAnd α_TDResults of close to 1, respectively (see substrates 3 and 4). In particular, the corresponding data are similar to the experimental results at 80 ℃ for 2 hours, which can replace the corresponding results.

In addition, the liquid crystal panel may satisfy the following equation 4.

[ equation 4]

(α_MD-1)(α_TD-1)≤0

By satisfying the above equation 4, the distortion risk can be prevented.

Further, the MD-direction bending moment acting on each layer can be determined by the product of the distance (z1 to z4, unit: μm) from the center of the liquid crystal panel to the center of each layer and the MD-direction shrinkage force (unit: N) acting on the relevant layer, and the TD-direction bending moment acting on each layer can be determined by the product of the distance (z1 to z4, unit: μm) from the center of the liquid crystal panel to the center of each layer and the TD-direction shrinkage force (unit: N) acting on the relevant layer.

For example, referring to FIG. 3, α_MDAnd α_TDCan be determined by the following equations 5 and 6.

[ equation 5]

α_MD(MD shrinkage force z1 of the polarizer layer in the first polarizing plate + MD shrinkage force z2 of the low moisture-permeable base material layer in the first polarizing plate)/(TD shrinkage force z3 of the polarizer layer in the second polarizing plate + TD shrinkage force z4 of the low moisture-permeable base material layer in the second polarizing plate)

[ equation 6]

α_TD(TD shrinkage force of the polarizer layer in the first polarizing plate z1+ TD shrinkage force of the low moisture-permeable base material layer in the first polarizing plate z 2)/(MD shrinkage force of the polarizer layer in the second polarizing plate z3+ MD shrinkage force of the low moisture-permeable base material layer in the second polarizing plate z4)

z1 may be the distance from the center of the liquid crystal panel 10 to the center of the polarizer layer 210 in the first polarizing plate 200, and z2 may be the distance from the center of the liquid crystal panel 10 to the center of the low moisture permeability base material layer 220 in the first polarizing plate 200. z3 may be the distance from the center of the liquid crystal panel 10 to the center of the polarizer layer 310 in the second polarizing plate 300, and z4 may be the distance from the center of the liquid crystal panel 10 to the center of the low moisture permeability substrate layer 320 in the second polarizing plate. In this document, the center also means the center in the thickness direction. Thus, the distances z1 to z4 can be adjusted by adjusting the thickness of each layer. That is, if the thickness of the relevant layer is increased, the distance from the center of the liquid crystal panel may be increased, and if the thickness of the layer is decreased, the distance from the center of the liquid crystal panel may be decreased.

As examples of equations 2 and 3, only bending moments (contraction forces) of the polarizer layer and the low moisture-permeable base material layer are considered, but in equations 2 and 3, the respective layers constituting the polarizing plate may be entirely or alternatively included.

Further, the contraction force may be determined based on the contraction rate. That is, the shrinkage force-based equation may be replaced with a shrinkage rate-based equation.

In summary, in the liquid crystal panel 10 to which the first polarizing plate (upper polarizing plate) and the second polarizing plate (lower polarizing plate) are respectively attached, since the bending moment of the specific layers of the first polarizing plate 200 and the second polarizing plate 300 is adjusted, the deflection balance can be adjusted, the crack can be prevented, and the light leakage phenomenon can be prevented. In this case, as a method of controlling the bending moment, the contraction force of each layer constituting the first polarizing plate and the second polarizing plate may be adjusted, and for example, the deflection balance may be adjusted by adjusting only the bending moment of the low moisture-permeable base material layer of the first polarizing plate and the second polarizing plate. The adjustment of the bending moment of the low moisture-permeable base material layer can be achieved by controlling the TD-direction (transmission axis direction) shrinkage force.

Further, the method for manufacturing the liquid crystal panel 100 related to one embodiment of the present invention is a method for manufacturing the liquid crystal panel 100 by attaching the first polarizing plate 200 and the second polarizing plate 300 to both surfaces of the liquid crystal cell 100, respectively.

As described above, the first and second polarizing plates 200 and 300 include the polarizer layers 210 and 310 and the low moisture-permeability base material layers 220 and 320 bonded to the polarizer layers, respectively.

Further, the method includes the step of producing the first polarizing plate and the second polarizing plate to satisfy the following equation 1.

[ equation 1]

|α_MD-α_TD|≤1

In equation 1, MD is a value determined by equation 2, and TD is a value determined by equation 3:

[ equation 2]

α_MDFirst polarization (acting on the first polarization)The sum of the absorbed axial bending moments at the layers of the sheet)/(the sum of the transmitted axial bending moments acting at the layers of the second polarizing plate)

[ equation 3]

α_TD(sum of transmitted axial bending moments acting on the respective layers of the first polarizing plate)/(sum of absorbed axial bending moments acting on the respective layers of the second polarizing plate)

In equations 2 and 3, 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 contraction force acting on the relevant layer, and

the transmissive 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 transmissive axial contraction force acting on the relevant layer.

Further, the method may include the step of producing the first polarizing plate and the second polarizing plate such that MD and TD defined by the following equations 2 and 3 are each 0.8 to 1.2.

Furthermore, α is preferable_MDAnd α_TDEach 0.85 to 1.15, and preferably, α_MDAnd α_TDEach is 1.

Further, it is preferable that the step of producing the first polarizing plate and the second polarizing plate satisfies the following equation 4.

[ equation 4]

(α_MD-1)(α_TD-1)≤0

Further, in the steps of producing the first polarizing plate and the second polarizing plate, the MD direction (absorption axis direction) shrinkage force of the polarizer layer may be adjusted to satisfy equations 2 and 3, wherein the MD direction shrinkage force may be 5N to 9N. Preferably, the MD direction shrink force may be greater than 5N and less than 9N.

Further, in the steps of producing the first polarizing plate and the second polarizing plate, the TD-direction (transmission axis direction) shrinkage force of the low moisture-permeable substrate layer may be adjusted to satisfy equations 2 and 3, wherein the TD-direction shrinkage force may be 3N to 10N, and preferably, the TD-direction shrinkage force may be greater than 3N and less than 10N.

The preferred embodiments of the present invention as described above have been disclosed for illustrative purposes, and those skilled in the art, having the ordinary knowledge of the present invention, may make various modifications, adaptations and additions within the spirit and scope of the invention, and such modifications, adaptations and additions should be considered to fall within the scope of the appended claims.

INDUSTRIAL APPLICABILITY

According to the liquid crystal panel and the method of manufacturing the same related to at least one embodiment of the present invention, by adjusting the shrinkage force of the polarizing plate, the deflection balance of the upper/lower polarizing plates can be adjusted, cracks of the polarizing plate can be prevented, and a light leakage phenomenon of the liquid crystal display device can be prevented.