KR20170068286A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a polarizing plate for preventing a curved polarizing plate from being deformed into a saddle-like shape by restoring force, comprising a first substrate and a second substrate bonded to each other and a liquid crystal layer interposed between the first substrate and the second substrate, Panel, first and second polarizing plates disposed at upper and lower portions of the liquid crystal panel and having different heat shrinkage ratios in mutually different directions, a backlight unit disposed under the liquid crystal panel and irradiating light toward the liquid crystal panel, and a liquid crystal panel, , A second polarizing plate, and a housing member for housing the backlight unit. Here, the heat shrinkage ratio of the first polarizing plate in the longitudinal direction of the first polarizing plate having the absorption axis parallel to the direction of the short side of the liquid crystal panel is preferably in the direction of the long side of the second polarizing plate having the absorption axis parallel to the long- 1/5 times to 1/3 times the shrinkage rate. Thus, the first polarizing plate is less affected by the restoring force than the second polarizing plate, so that the first polarizing plate can be prevented from being deformed to the saddle shape.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device for displaying an image using optical anisotropy and polarization properties of a liquid crystal, and more particularly to a curved liquid crystal display device having a curved display surface.

As the era of informationization becomes full-scale, the display field for visually displaying electrical information signals is rapidly developing. Accordingly, studies have been continuing to develop performance such as thinning, lightening, and low power consumption for various flat display devices.

Typical examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) An electroluminescence display device (ELD), an electro-wetting display device (EWD), and an organic light emitting display device (OLED).

Such a flat panel display device includes a flat display surface.

However, when the display surface is plane, there is a problem that a deviation of the image display occurs because the distance from the display surface differs for each position of the viewing area. In order to solve this problem, a curved display device having a display surface of a curved surface has been proposed.

On the other hand, a liquid crystal display device includes a liquid crystal panel that displays an image using optical anisotropy and polarization properties of the liquid crystal. The liquid crystal panel includes a pair of substrates and a liquid crystal layer injected therebetween, and adjusts the light transmittance of each pixel region by adjusting the alignment direction of the liquid crystal. That is, the liquid crystal panel does not generate light by itself, but controls the amount of light emitted from the outside in each pixel region to display an image. Therefore, the liquid crystal display further includes a backlight unit for irradiating the liquid crystal panel with light.

The liquid crystal display further includes two polarizing plates disposed on the upper and lower sides of the liquid crystal panel and having mutually perpendicular absorption axes for shielding external light interference and using the light of the backlight unit as display light.

When the liquid crystal display device is a curved display device, the liquid crystal panel and the two polarizing plates disposed on the upper and lower sides of the liquid crystal panel are provided in a planar shape, and then deformed into a curved surface shape in a high temperature atmosphere using the heat shrinkage ratio in the long- do. Accordingly, when the curved liquid crystal display device is installed in a room temperature atmosphere for a long time, the curved liquid crystal panel and the two polarizing plates can be expanded or contracted by the restoring force, that is, the restoring force.

However, as mentioned above, the two polarizers disposed on the upper and lower sides of the liquid crystal panel have absorption axes perpendicular to each other. That is, one polarizing plate of the two polarizing plates has an absorption axis parallel to the long-side direction, while the other polarizing plate has an absorption axis parallel to the short-side direction, not the long-side direction. At this time, the absorption axis of each polarizing plate corresponds to the stretching direction of the stretching material.

As shown in Fig. 1, in the case of a polarizing plate having an absorption axis parallel to the short side direction, the stretching direction interferes with a direction in which a restoring force to deform in a planar form acts in a curved shape. Thus, there is a problem that the polarizing plate is not simply restored to a planar shape but is deformed into a saddle shape.

In addition, the liquid crystal panel can be deformed by the polarizing plate deformed in the form of a saddle-like shape, whereby the liquid crystal panel and the polarizing plate are detached from or deformed from the curved receiving member, so that the bezel region and the bezel region between the liquid crystal panel and the receiving member There arises a problem that light defects are easily generated in a part of the region adjacent thereto. Such a defective light guide causes a problem that the contrast ratio of the curved liquid crystal display device is lowered and the image quality is deteriorated, and the lifetime is lowered.

The present invention provides a curved liquid crystal display device capable of preventing a curved polarizing plate from being deformed into a saddle shape.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel including a first substrate and a second substrate bonded to each other, a liquid crystal layer interposed between the first substrate and the second substrate, A liquid crystal panel, a first polarizing plate, a second polarizing plate, and a backlight unit, the first and second polarizing plates having different heat shrinkage ratios in the long-side direction, a backlight unit disposed under the liquid crystal panel and irradiating light toward the liquid crystal panel, And a liquid crystal display device. Here, the liquid crystal panel, the first polarizing plate, and the second polarizing plate are seated on the receiving member in a state of being deformed into a curved shape curved at a predetermined radius of curvature by using heat shrinkage ratios in the respective long side directions.

The first polarizing plate has an absorption axis parallel to the short side direction of the liquid crystal panel, and the second polarizing plate has an absorption axis perpendicular to the absorption axis of the first polarizing plate and parallel to the long side direction of the liquid crystal panel. Here, the heat shrinkage rate of the first polarizer plate in the long-side direction is 1/15 to 1/3 times the heat shrinkage rate of the second polarizer plate in the long-side direction.

The liquid crystal display according to each embodiment of the present invention includes first and second polarizers disposed on upper and lower sides of a liquid crystal panel, wherein the first and second polarizers have different heat shrinkage ratios in the long side direction. Particularly, among the first and second polarizing plates, the heat shrinkage ratio of the first polarizing plate having the absorption axis parallel to the short side direction of the liquid crystal panel is shorter than that of the second polarizing plate having the absorption axis parallel to the longer side direction of the liquid crystal panel .

Thus, the first polarizing plate is less affected by the restoring force than the second polarizing plate, so that the first polarizing plate can be prevented from being deformed to the saddle shape.

Therefore, deformation of the liquid crystal panel due to the polarizing plate deformed in the shape of a saddle can be prevented, and thereby, the liquid crystal panel and the polarizing plate can be prevented from being detached from or disengaged from the receiving member. Thus, defective light beams can be prevented in the bezel area and the periphery thereof due to the deviation between the liquid crystal panel and the storage member, and reduction of the contrast ratio, image quality degradation, and life span due to defective light beams can be prevented.

1 is a view showing an example in which a curved polarizing plate is deformed into a saddle shape.
2 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.
3 is a view illustrating a liquid crystal panel, first and second polarizing plates according to a first embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a curved-type liquid crystal display device according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a liquid crystal display according to a first embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG.

FIG. 2 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 3 is a diagram illustrating a liquid crystal panel, first and second polarizing plates according to the first embodiment of the present invention.

2, the liquid crystal display 100 according to the first embodiment of the present invention includes a liquid crystal panel 110, a first polarizer 121 disposed below the liquid crystal panel 110, a liquid crystal panel 110, A backlight unit 130 disposed under the first polarizing plate 121 and irradiating light toward the liquid crystal panel 110 side and a liquid crystal panel 110 and first and second polarizing plates 121 and 122, and a storage member 140 for storing the backlight unit 130 therein. At least the liquid crystal panel 110 and the first and second polarizers 121 and 122 are set in the receiving member 140 in a state of being deformed into a curved shape curved at a predetermined radius of curvature R. Here, the radius of curvature R is a value indicating the degree of curvature at each point of a curved surface or a curved line, and is a circle nearest to the curve, that is, a radius of the contact circle.

2, the backlight unit 130 may also be seated in the receiving member 140 in a state of being deformed into a curved shape bent with a radius of curvature R. [ 2, the liquid crystal display 100 may further include a guide member (not shown) for receiving the liquid crystal panel 110, the first and second polarizers 121 and 122, And the accommodation member 140 may be configured to house the guide member and the backlight unit 130.

The liquid crystal display device 100 may further include a reinforcing plate 150 disposed on the second polarizing plate 122 and protecting the first polarizing plate 121 and the liquid crystal panel 110 from external force. In this case, the reinforcing plate 150 may be seated in the receiving member 140 while being attached on the second polarizing plate 122. Alternatively, although not shown in FIG. 2, the reinforcing plate 150 may be attached onto the receiving member 140.

The liquid crystal panel 110 includes first and second substrates 111 and 112 bonded to each other, a liquid crystal layer 113 interposed between the first and second substrates 111 and 112, And a sealing layer 114 disposed on an edge region between the first and second substrates 111 and 112 to bond the first and second substrates 111 and 112 together.

Although not shown in detail in FIG. 2, when the liquid crystal panel 110 is an active matrix driving type, the first substrate 111 disposed below the first and second substrates 111 and 112 defines a plurality of pixel regions And a thin film transistor array for driving each pixel region.

The thin film transistor array includes a gate line and a data line crossing each other to define a plurality of pixel regions in a display region, a thin film transistor corresponding to each pixel region and arranged in an intersection region between the gate line and the data line, And a pixel electrode connected to each thin film transistor.

The active matrix drive type liquid crystal panel 110 further includes a common electrode disposed on one of the first and second substrates 111 and 112 to generate a predetermined electric field together with the pixel electrode. At this time, the arrangement direction of the liquid crystals in the liquid crystal layer 113 is changed by the electric field between the pixel electrode and the common electrode, so that the light transmittance of each pixel region is adjusted.

2, when the liquid crystal panel 110 displays a color image, the liquid crystal panel 110 may include a color filter disposed on one of the first and second substrates 111 and 112, .

The first polarizing plate 121 is disposed below the first substrate 111 and the second polarizing plate 122 is disposed above the second substrate 112. The first and second polarizing plates 121 and 122 have mutually orthogonal absorption axes.

The first polarizing plate 121 polarizes the light incident on the liquid crystal panel 110 from the backlight unit 130 to the first polarizing axis. The second polarizing plate 122 emits, as display light, light polarized at a second polarization axis perpendicular to the first polarizing axis by the liquid crystal panel 110.

Although not shown in detail in FIG. 2, the backlight unit 130 is disposed on a light guide plate facing the liquid crystal panel 110, a light source facing at least one side of the light guide plate, a reflection sheet disposed under the light guide plate, and a light guide plate, And at least one optical sheet for diffusing light. The backlight unit 130 may further include a guide member disposed in the accommodation member 140 and supporting the light guide plate, the light source, the reflective sheet, and at least one optical sheet, And a light shielding tape disposed on the spacing portion of the light shielding plate. In addition, the at least one optical sheet may include a diffusion sheet for diffusing or scattering the light emitted from the upper surface of the light guide plate, and a prism sheet for condensing the light.

As shown in Fig. 3, the first and second polarizing plates 121 and 122 have mutually perpendicular absorption axes. Concretely, any one of the first and second polarizing plates 121 and 122 has an absorption axis parallel to a corner bent so as to be deformed into a long side direction of the liquid crystal panel 110, that is, a curved shape. The other one has an absorption axis parallel to the short side direction of the liquid crystal panel 110, i.e., the edge that does not bend but maintains a straight line.

3, the first polarizer 121 disposed below the first substrate 111 of the liquid crystal panel 110 is an absorption axis parallel to the short side direction of the liquid crystal panel 110, The second polarizer 122 disposed on the second substrate 112 of the liquid crystal panel 110 may be an absorption axis parallel to the long side direction of the liquid crystal panel 110. It is assumed in the following description that the absorption axis of the first polarizing plate 121 is parallel to the short side direction of the liquid crystal panel 110 and the absorption axis of the second polarizing plate 122 is parallel to the long side direction of the liquid crystal panel 110 . The absorption axis of the first polarizer 121 is parallel to the longitudinal direction of the liquid crystal panel 110 and the absorption axis of the second polarizer 122 is parallel to the longitudinal direction of the liquid crystal panel 110, It may be parallel to the short-side direction of the side wall.

Each of the first and second polarizing plates 121 and 122 includes a pair of polarizing elements 211 and 212 made of a stretched material and a pair of protective substrates 221a and 221b facing each other with the polarizing elements 211 and 212 interposed therebetween ) 222a and 222b. Here, the stretching material may have a polarizing function through a stretching process in which stretching is performed in a direction corresponding to the absorption axis. Illustratively, the stretching material may be PVA (Polyvinyl Alcohol).

Specifically, the first polarizing plate 121 includes a first polarizing element 211 for polarizing light with an absorption axis (up and down arrow in Fig. 3) parallel to the short side direction of the liquid crystal panel 110, And a pair of protective substrates 221a and 221b facing each other with a space therebetween.

The second polarizing plate 122 has a second polarizing element 212 for polarizing light with an absorption axis parallel to the longitudinal direction of the liquid crystal panel 110 And a pair of protective substrates 222a and 222b facing each other and sandwiched between the pair of protective substrates 222a and 222b.

As described above, the liquid crystal panel 110, the first and second polarizers 121 and 122 are deformed to have a curved shape rather than a flat shape in a high-temperature atmosphere using the respective heat shrinkage ratios, (Not shown).

When at least one of the liquid crystal panel 110 and the first and second polarizers 121 and 122 is gradually restored to a planar shape when the liquid crystal display device 100 is exposed to a normal temperature atmosphere for a predetermined period or more, Thereby expanding or contracting in a predetermined direction.

In particular, in the case of the first polarizing plate 121, the first polarizing element 211 is stretched so as to have an absorption axis which does not coincide with the long side direction bent to be deformed into a curved shape. Thus, the restoring force of the first polarizing plate 121 is not generated in the direction in which the bending process is performed, but in the direction in which the direction in which the stretching process is performed is interfered with in the direction in which the bending process is performed. With this restoring force, the first polarizing plate 121 can be deformed into a saddle-like shape. The liquid crystal panel 110 and the second polarizing plate 122 disposed on the first polarizing plate 121 can be deformed into a saddle-like shape as in the first polarizing plate 121 deformed in the saddle-like shape. As a result, the liquid crystal panel 110, the first and second polarizers 121 and 122 can not maintain a curved shape of a predetermined radius of curvature R, so that they can be separated from the receiving member 140 There is a problem. At this time, defects in the light leakage occur due to the gaps generated between the liquid crystal panel 110 and the receiving member 140, thereby deteriorating the contrast ratio, lowering the image quality, and lowering the service life.

In order to solve this problem, the first polarizing plate 121 according to the first embodiment of the present invention has a heat shrinkage rate different from that of the second polarizing plate 122. That is, the first and second polarizers 121 and 122 have different heat shrinkage ratios, and are affected by different restoring forces.

In particular, since the first polarizing plate 121 has an absorption axis which does not coincide with the long side direction of the liquid crystal panel 110, it can be deformed into a saddle shape by the restoring force. Thus, the first polarizing plate 121 has a heat shrinkage ratio in the long-side direction lower than that in the long-side direction of the second polarizing plate 122 so that the first polarizing plate 121 has a restoring force smaller than that of the second polarizing plate 122.

Illustratively, the heat shrinkage ratio of the first polarizing plate 121 in the long-side direction may be 1/15 to 1/3 of the heat shrinking rate in the long-side direction of the second polarizing plate 122. The heat shrinkage rate of each of the first and second polarizers 121 and 122 in the long-side direction can be controlled by at least one of a thickness and a material.

According to the first embodiment, the first and second polarizing plates 121 and 122 include the polarizing elements 211 and 212 having different thicknesses, so that they have different heat shrinkage ratios in the long side direction.

Illustratively, the thickness of the first polarizing element 211 of the first polarizing plate 121 may be 1/10 to 1/2 times the thickness of the second polarizing element 212 of the second polarizing plate 122. In this case, the thickness of the second polarizing element 212 of the second polarizing plate 122 may be 3 탆 to 30 탆.

If the thickness of the second polarizing element 212 is less than 3 占 퐉, there is a problem that the polarizing element 212 tears during the stretching process for forming the absorption axis. If the thickness of the second polarizing element 212 is larger than 30 mu m, there is a problem that the light efficiency may be lowered by the polarizing plate 122 and the circular force increases.

The following Tables 1 and 2 are the results of tests on the light-shielding defects according to the prior art examples, the first to sixth examples according to the first embodiment of the present invention, and the defective examples, respectively.

In Table 1 and Table 2, common experimental conditions for each example are that the bending process of the polarizing plate is performed for 75 hours or more at an ambient temperature of 75 degrees Celsius and a structure including a curved backlight unit. In Table 1 and Table 2, when the HVC (Human Visual Contrast) of black gradation is 11 or more, it is classified as defective of light-shielding. HVC is a parameter indicating the visibility of luminance in accordance with a predetermined calculation formula.

Conventional technology First example Example 2 Example 3 The thickness of the second polarizing element 25 m 12 탆 18 탆 18 탆 The thickness of the first polarizing element 25 m 5 탆 5 탆 7 탆 Radius of curvature 1.8 2.5 2.8 2.7 HVC 30 8 6 7 Bad light NG OK OK OK

Example 4 Example 5 Example 6 Bad example The thickness of the second polarizing element 25 m 25 m 25 m 25 m The thickness of the first polarizing element 5 탆 7 탆 12 탆 18 탆 Radius of curvature 3.1 3.0 2.4 2.2 HVC 2 3 11 25 Bad light OK OK OK NG

It can be confirmed that, even when the first and second polarizing elements have the same thickness of 25 탆 and bend at a relatively small radius of curvature of 1.8, as in the prior art shown in Table 1, defects in the light-shielding occur.

On the other hand, as in the first to sixth examples shown in Table 1, when the thickness of the second polarizing element 212 is any one of 12 占 퐉, 18 占 퐉 and 25 占 퐉 and the thickness of the first polarizing element 211 is It can be confirmed that even when the thickness is 1/5 times to 1/2 times the thickness of the two polarizing elements 212, the optical system is not defective even when bent at a radius of curvature of 2.4 to 3.1 which is larger than that of the conventional art. At this time, although the restoring force is increased as the radius of curvature is larger, in the first to sixth examples according to the first embodiment of the present invention, defects of light in the bezel region due to deformation of the polarizing plate are not generated.

In addition, as in the case of the poor example in Table 2, the thickness of the second polarizing element 122 is 25 占 퐉, the thickness of the first polarizing element 211 is smaller than the thickness of the second polarizing element 212, 212, it is confirmed that even if the radius of curvature is 18 탆, which is smaller than that of the first to sixth examples, a defective light beam is generated.

As described above, when the thickness of the first polarizing element 211 is 1/5 to 1/2 times the thickness of the second polarizing element 212, if the original polarizing force of the first polarizing plate 121 is in the shape of a saddle So that it is not deformed. Even if the shape of the first polarizing plate 121 is deformed by the restoring force because the original polarizing force of the second polarizing plate 122 is larger than the original polarizing force of the first polarizing plate 121, . Even if the first and second polarizers 121 and 122 are deformed into a curved surface having a radius of curvature larger than that of the example according to the related art, defective light beams in the bezel region due to the first polarizer 121, Can be easily anticipated.

On the other hand, unlike the first embodiment, the first and second polarizing plates 121 and 122 include the polarizing elements 211 and 212 made of different materials, so that they can have different heat shrinkage ratios in the long side direction.

That is, in the liquid crystal display device according to the second embodiment of the present invention, the second polarizing element 212 of the second polarizing plate 122 is made of a stretched material having a polarizing function through the stretching process, Except that the first polarizing element 211 of the first polarizing element 211 is made of a non-stretchable material having a polarizing function without a stretching process, the duplicated description will be omitted.

Illustratively, the first polarizing element 211 of the first polarizing plate 121 may be made of a patterned non-extrinsic material. Here, the non-extrinsic material may be any one of a dye (DYE), a reactive liquid crystal, and a metal.

Table 3 below shows the results of experiments on whether or not the light leakage is bad according to the examples according to the prior art and the seventh and eighth examples according to the second embodiment of the present invention.

Conventional technology Example 7 Example 8 The thickness of the second polarizing element 25 m 25 m 18 탆 The first polarizing element 25 m Unleaded Unleaded HVC 30 2 3 Bad light NG OK OK

When the thickness of the second polarizing element 212 is any one of 25 占 퐉 and 18 占 퐉 and the first polarizing element 211 is made of a non-stretchable material as in the seventh and eighth examples shown in Table 3, Can be confirmed.

That is, when the first polarizing element 211 is made of a non-extrinsic material as in the second embodiment, the direction in which the restoring force is generated in the first polarizing plate 121 is affected only in the bending direction, Can be prevented from being deformed into a saddle shape.

Alternatively, unlike the first and second embodiments, the first and second polarizing plates 121 and 122 include a protective substrate made of different materials, so that they can have different heat shrinkage ratios in the long side direction.

That is, in the liquid crystal display device according to the third embodiment of the present invention, the protective substrates 221a and 221b of the first polarizing plate 121 are arranged in a row in the long side direction lower than the protective substrates 222a and 222b of the second polarizing plate 122 Except for the fact that it is made of a material having a shrinkage factor. Therefore, duplicated description will be omitted. The heat shrinkage rate of the protective substrates 221a and 221b of the first polarizing plate 121 in the long side direction is set to 1/50 to 1/10 of the heat shrinkage rate of the protective substrates 222a and 222b of the second polarizing plate 122 in the long- / 15 times.

Illustratively, the protective substrates 221a and 221b (222a and 222b) of the first and second polarizers 121 and 122 are formed of a triacetyl-cellulose (TAC) film, a PET (polyester) film, and a COP Polymer) film. Here, the heat shrinkage rate of the TAC film in the long-side direction is 0.1, and the heat shrinkage rate in the long-side direction of the PET film is 2.5.

Thus, according to the third embodiment, the protective substrates 222a and 222b of the second polarizing plate 122 having the absorption axis parallel to the long-side direction can be made of a PET film having a relatively high heat shrinkage ratio in the long-side direction. The protective substrates 221a and 221b of the first polarizing plate 121 having absorption axes which do not coincide with the long side direction have a heat shrinkage ratio in the long side direction of about 1/4 of the protective substrates 222a and 222b of the second polarizing plate 122, 50 times as much as the PET film.

On the other hand, the deformation of the first and second polarizers 121 and 122 is affected by moisture to a relatively large extent.

Thus, according to the fourth embodiment, the protective substrates 221a and 221b of the first polarizing plate 121 are made of a material having a lower moisture permeability than the protective substrates 222a and 222b of the second polarizing plate 122. Illustratively, the moisture permeability of the protective substrates 221a and 221b of the first polarizing plate 121 may be 0 to 1/20 times the moisture permeability of the protective substrates 222a and 222b of the second polarizing plate 122.

As a result, the degree to which the restoring force of the first polarizing plate 121 is expressed is lower than the degree to which the restoring force of the second polarizing plate 122 is expressed, so that the first polarizing plate 121 is prevented from being deformed into a saddle- can do.

As mentioned above, the materials that can be provided as the protective substrates 221a and 221b (222a and 222b) include TAC film, PET film, and COP film.

Here, the moisture permeability of the TAC film is about 400 G / m ² -day, the moisture permeability of the PET film is about 9 G / m ² -day, and the moisture permeability of the COP film is about 0.5 G / m ² -day.

Thus, according to the fourth embodiment, the protective substrates 222a and 222b of the second polarizing plate 122 having the absorption axis parallel to the long-side direction can be made of a TAC film having a relatively high moisture permeability. The protective substrates 221a and 221b of the first polarizing plate 121 having absorption axes which do not coincide with the long side direction may be made of a PET film or a COP film.

As described above, according to the embodiments of the present invention, the thicknesses of the polarizing elements 211 and 212, the thicknesses of the polarizing elements 211 and 212, and the thicknesses of the polarizing elements 211 and 212 in the first and second polarizing plates 121 and 122, And the materials of the protective substrates 221a and 221b are different from each other. The first polarizing plate 121 having an absorption axis which does not coincide with the long side direction of the liquid crystal panel 110 is positioned at a lower side of the second polarizing plate 122 having an absorption axis coinciding with the long side direction of the liquid crystal panel 110 Of heat shrinkage. Thus, the first polarizing plate 121 is affected by a restoring force smaller than that of the second polarizing plate 122, so that it can be prevented from being deformed into a saddle shape. Therefore, the liquid crystal panel 110 can be prevented from being deformed by the first polarizing plate 121 deformed in the shape of a saddle-like shape, so that the deficiency of the light-shielding and consequently the deterioration of the contrast ratio and the deterioration of the image quality can be prevented.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

100: liquid crystal display device 110: liquid crystal panel
121: first polarizer 122: second polarizer
130: backlight unit 140: storage member
150: Strengthening plate
211: first polarizing element 212: second polarizing element
221a, 221b, 222a, 222b:

Claims (14)

1. A liquid crystal display comprising: a liquid crystal panel including first and second substrates bonded together opposite to each other, and a liquid crystal layer interposed between the first and second substrates;
First and second polarizers disposed on the upper and lower sides of the liquid crystal panel and having different heat shrinkage ratios in the longitudinal direction;
A backlight unit disposed below the liquid crystal panel and emitting light toward the liquid crystal panel; And
And a housing member for housing the liquid crystal panel, the first polarizing plate, the second polarizing plate, and the backlight unit,
Wherein the liquid crystal panel, the first polarizing plate, and the second polarizing plate are seated on the receiving member in a state of being deformed into a curved shape curved at a predetermined radius of curvature by using heat shrinkage ratios in respective long side directions. The method according to claim 1,
Wherein the first polarizing plate has an absorption axis parallel to the short side direction of the liquid crystal panel,
And the second polarizer has an absorption axis perpendicular to an absorption axis of the first polarizer and parallel to a long side direction of the liquid crystal panel. 3. The method of claim 2,
Wherein the heat shrinkage rate of the first polarizer in the long-side direction is 1/15 to 1/3 of the heat shrinkage rate of the second polarizer in the long-side direction. 3. The method of claim 2,
Each of the first and second polarizing plates
A polarizing element made of a stretched material; And
And a pair of protective substrates facing each other with the polarizing element interposed therebetween. 5. The method of claim 4,
Wherein the polarizing elements of the first and second polarizing plates are different in thickness from each other. 6. The method of claim 5,
And the thickness of the polarizing element of the first polarizing plate is 1/10 to 1/2 times the thickness of the polarizing element of the second polarizing plate. The method according to claim 6,
And the thickness of the polarizing element of the second polarizing plate is 3 to 30 占 퐉. 3. The method of claim 2,
Wherein the first polarizing plate comprises a first polarizing element made of a non-extrinsic material; And a pair of protective substrates facing each other with the first polarizing element interposed therebetween,
Wherein the second polarizer comprises a second polarizing element made of a stretched material; And a pair of protective substrates facing each other with the second polarizing element interposed therebetween. 9. The method of claim 8,
Wherein the non-extrinsic material is any one of a dye (DYE), a reactive liquid crystal, and a metal. 10. The method according to any one of claims 4 to 9,
Wherein the protective substrate of each of the first and second polarizing plates is made of any one of a triacetyl cellulose (TAC) film, a PET (polyester) film and a COP (Cyclo Olefin Polymer) film. 11. The method of claim 10,
Wherein the protective substrate of each of the first and second polarizing plates is made of a material having a different heat shrinkage ratio in the long side direction. 12. The method of claim 11,
Wherein the protective substrate of the first polarizing plate is made of a TAC film, and the protective substrate of the second polarizing plate is made of a PET film. 11. The method of claim 10,
Wherein the protective substrates of the first and second polarizing plates are made of a material having a moisture permeability different from each other. 14. The method of claim 13,
Wherein the protective substrate of the first polarizing plate is made of a TAC film, and the protective substrate of the second polarizing plate is made of a PET film or a COP film.

Images