KR20160067298A - Curved liquid crystal display device - Google Patents

Abstract

The present invention relates to a curved liquid crystal display device which can improve an immersion degree. According to the present invention, the curved liquid crystal display device is manufactured by attaching upper and lower polarization plates to a liquid crystal panel by using a hard-type bonding layer, and performing annealing in a curved state or attaching a polarization plate in the curved state, thereby preventing light leakage.

Description

[0001] Curved liquid crystal display device [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a curved liquid crystal display device.

BACKGROUND ART [0002] As an information-oriented society develops, there has been a growing demand for display devices for displaying images, and liquid crystal displays (LCD) devices, plasma display panel devices (PDP devices) Various flat panel display devices (FPD devices) such as organic light emitting diode (OLED) devices have been widely developed and applied to various fields.

Among these flat panel display devices, liquid crystal display devices are widely used because they have advantages of miniaturization, weight reduction, thinning, low power driving, and the like.

In general, a liquid crystal display device utilizes optical anisotropy and polarization properties of liquid crystal, and includes a liquid crystal layer between two substrates and two substrates, and a pixel electrode and a common electrode for driving liquid crystal molecules of the liquid crystal layer. Therefore, in the liquid crystal display device, the liquid crystal molecules move by the electric field generated by applying the voltage to the pixel electrode and the common electrode, and thereby the image is expressed by the light transmittance which varies according to the movement. Such a liquid crystal display device is applied to a variety of applications ranging from portable devices such as mobile phones and multimedia devices to notebook computers or computer monitors and large-sized televisions.

However, the liquid crystal display device as the flat panel display device has a problem that a distance deviation occurs from the main viewing area of the viewer to the display screen depending on the position.

This will be described with reference to FIG.

1 is a schematic view of a general liquid crystal display device.

The first distance d1 from the main viewing area of the viewer to the central area of the liquid crystal display device 10 and the first distance d1 from the main viewing area are obtained as shown in Fig. The second distances d2 to the right and left side regions of the display device 10 are different from each other. That is, the second distance d2 is larger than the first distance d1, and a distance deviation from the main viewing area to the display screen of the liquid crystal display device 10 occurs.

Such a problem of the distance deviation becomes larger as the screen of the liquid crystal display device 10 becomes larger, and the immersion of the image displayed through the liquid crystal display device 10 is lowered.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a curved liquid crystal display device capable of solving the problem of distance deviation.

In order to achieve the above object, the present invention provides a liquid crystal display comprising a liquid crystal panel, a first polarizer attached to a lower surface of the liquid crystal panel, a first adhesive layer between the liquid crystal panel and the first polarizer, And a second adhesive layer between the liquid crystal panel and the second polarizing plate, wherein the first adhesive layer and the second adhesive layer are of a hard type having an elastic modulus of 100,000 Pa or more A curved liquid crystal display device is provided.

The curved surface liquid crystal display of the present invention may further comprise an auxiliary film attached to the upper portion of the second polarizer and a third adhesive layer between the second polarizer and the auxiliary film, and the third adhesive layer is of a hard type.

The auxiliary film is an antistatic layer, a hard coating layer, a low reflection layer, or a patterned retarder.

A method of manufacturing a liquid crystal display device, comprising the steps of: preparing a liquid crystal panel; attaching a first polarizing plate to a lower surface of the liquid crystal panel using a first adhesive layer; And forming a curved surface on the liquid crystal panel, wherein the first adhesive layer and the second adhesive layer are of a hard type having a modulus of elasticity of 100,000 Pa or more .

The step of forming the curved surface may include the step of attaching the first polarizing plate and the step of attaching the second polarizing plate, and annealing the liquid crystal panel to which the first and second polarizing plates are attached.

The step of forming the curved surface includes a step of attaching the first polarizing plate and a step of disposing the liquid crystal panel on a stage having a curved upper surface, which is performed before the step of attaching the second polarizing plate.

Wherein the step of attaching the first polarizing plate includes attaching the first polarizing plate to the liquid crystal panel disposed on a stage having an upper surface of a convex curved surface shape, And attaching the second polarizing plate to the liquid crystal panel disposed on a stage having a top surface of a convex curved shape.

The method of manufacturing a curved surface liquid crystal display device of the present invention may further comprise the step of attaching an auxiliary film to a top of the second polarizing plate using a third adhesive layer, wherein the third adhesive layer is of a hard type.

By providing the curved liquid crystal display device according to the present invention, it is possible to prevent a deviation between the distance from the main viewing area to the central area of the display device and the distance to both side areas. Therefore, there is an effect that the degree of immersion of the viewer can be improved.

In addition, since the curved surface liquid crystal display device is manufactured by annealing in the curved surface state or attaching the polarizing plate in the curved surface state, when the planar display device is artificially bent, the stress applied locally can be removed to prevent light leakage.

Also, since the adhesive layers of the upper and lower polarizers are both hard-type to maintain the curved state, the curved liquid crystal display device can be prevented from being deformed into a flat state, and light leakage can be prevented.

1 is a schematic view of a general liquid crystal display device.
2 is a schematic view of a curved-surface liquid crystal display device according to a first embodiment of the present invention.
3 is a view illustrating a light leakage generated in a curved LCD according to a first embodiment of the present invention.
4 is a schematic cross-sectional view of a curved-surface liquid crystal display device according to the first embodiment of the present invention.
FIG. 5A is a view showing the arrangement state of the liquid crystal molecules on the inner surface of the first substrate at one corner of the curved-surface liquid crystal display device according to the first embodiment of the present invention. FIG. FIG. 5C is a view showing the arrangement state of liquid crystal molecules in the second substrate inner surface in one corner portion of the liquid crystal display device, and FIG. 5C is a diagram showing the alignment state of the liquid crystal molecules in FIGS.
6 is a schematic cross-sectional view of a curved-surface liquid crystal display device according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view schematically illustrating a liquid crystal panel of a curved-surface liquid crystal display device according to a second embodiment of the present invention, showing one pixel region.
8 is a view schematically showing an example of a curved surface forming method of a curved surface liquid crystal display device according to a second embodiment of the present invention.
9A and 9B are views schematically showing another example of a curved surface forming method of a curved surface liquid crystal display device according to a second embodiment of the present invention.
10 is a schematic cross-sectional view of a curved liquid crystal display device according to a third embodiment of the present invention.
11A to 11C are views schematically showing an example of a curved surface forming method of a curved surface liquid crystal display device according to a third embodiment of the present invention.

Hereinafter, the present invention capable of solving the above problems will be described with reference to the drawings.

- First Embodiment -

2 is a schematic view of a curved-surface liquid crystal display device according to a first embodiment of the present invention.

As shown in FIG. 2, the curved-surface liquid crystal display 100 according to the first embodiment of the present invention has a curved shape. That is, the flat display device is curved at a constant curvature with respect to the center, thus forming a curved surface shape.

The first distance d11 from the main viewing area of the viewer to the central area of the curved liquid crystal display 100 and the second distance d12 from the main viewing area to both left and right sides of the curved liquid crystal display 100 are The problem of the distance deviation in the conventional flat panel display is solved and the immersion of the viewer is improved.

However, since the curved-surface liquid crystal display 100 according to the first embodiment forms a curvature artificially, as shown in FIG. 3, light leakage occurs at four corners.

This light beam will be described with reference to FIG. 4 and FIGS. 5A to 5C.

4 is a schematic cross-sectional view of a curved-surface liquid crystal display device according to the first embodiment of the present invention. FIG. 5A is a view showing the arrangement state of the liquid crystal molecules on the inner surface of the first substrate at one corner of the curved-surface liquid crystal display device according to the first embodiment of the present invention. FIG. FIG. 5C is a view showing the arrangement state of liquid crystal molecules in the second substrate inner surface in one corner portion of the liquid crystal display device, and FIG. 5C is a diagram showing the alignment state of the liquid crystal molecules in FIGS.

4, the curved-surface liquid crystal display 100 according to the first embodiment of the present invention includes a first substrate 110, a second substrate 120, and first and second substrates 110, 120 between the liquid crystal layer 130 and the liquid crystal layer 130. A seal pattern 140 for preventing the leakage of the liquid crystal layer 130 is formed at the edge between the first and second substrates 110 and 120.

Although not shown, on the inner surface of the first substrate 110, a gate wiring and a data wiring crossing each other and defining a pixel region, a thin film transistor connected to the gate wiring and the data wiring, a pixel electrode And a common electrode for generating an electric field together with the pixel electrode are formed. The first substrate 110 is referred to as an array substrate.

Although not shown, a black matrix and a color filter layer may be formed on the inner surface of the second substrate 120. The black matrix is located corresponding to the gate wiring, the data wiring, and the thin film transistor, has an opening corresponding to the pixel region, and blocks light other than the pixel region. The color filter layer corresponds to the opening portion of the black matrix, and includes color filters of red, green, and blue sequentially arranged, and one color filter corresponds to one pixel region. This second substrate 120 is referred to as a color filter substrate.

First and second alignment films (not shown) having alignment axes in a predetermined direction are formed on the uppermost layers of the inner surfaces of the first substrate 110 and the second substrate 120, respectively, and liquid crystal molecules of the liquid crystal molecules The initial arrangement is determined. Here, the alignment axes of the first and second alignment films are parallel to the short side direction of the substrates 110 and 120, respectively.

A lower polarizer and an upper polarizer (not shown) are attached to the outer surfaces of the first substrate 110 and the second substrate 120, respectively, and the light transmission axis of the lower polarizer is perpendicular to the light transmission axis of the upper polarizer .

The curved-surface liquid crystal display device 100 according to the first embodiment of the present invention is deformed from a planar state to a curved surface state.

For example, in order to realize a curved surface in the horizontal direction, that is, in the long-side direction, the curved-surface liquid crystal display device 100 according to the first embodiment of the present invention artificially applies a force to move the flat- 2 substrate 120 by a predetermined curvature. Since the edges of the first substrate 110 and the second substrate 120 are adhered to each other by the seal pattern 140, the behavior of the first substrate 110 and the second substrate 120 with respect to the deflection is different.

That is, in the curved liquid crystal display device 100, tensile stress is applied to the first substrate 110 outside the curved surface along the transverse direction, and a tensile stress is applied to the curved inner surface of the second substrate 120 along the transverse direction A compressive stress is applied. Since the edges of the first substrate 110 and the second substrate 120 are fixed by the seal pattern 140, the edges of the first substrate 110 and the second substrate 120 are subjected to torsional stress And the first substrate 110 and the second substrate 120 are shifted in directions opposite to each other.

At this time, the torsional stress is greatest at the four corners of the first substrate 110 and the second substrate 120, and the alignment axes of the first and second alignment films (not shown) are twisted by the torsional stress, And the liquid crystal molecules adjacent to the inner surfaces of the second substrates 110 and 120 are twisted, light leakage occurs at four corners.

In other words, as shown in FIG. 5A, as the alignment axes of the first and second alignment films are twisted in opposite directions to each other, in one corner portion of the curved-surface liquid crystal display device according to the first embodiment of the present invention, The liquid crystal molecules 131 positioned on the inner surface of the substrate 110 are rotated in the clockwise direction with respect to the initial alignment axis and the liquid crystal molecules 131 located on the inner surface of the second substrate 120 The molecules 132 are rotated counterclockwise with respect to the initial orientation axis.

5C, the liquid crystal molecules 131 located on the inner surface of the first substrate 110 (FIG. 4) and the liquid crystal molecules 132 located on the inner surface of the second substrate 120 (FIG. 4) (? 1).

Light misregistration occurs due to the misalignment of the liquid crystal molecules 131 and 132.

On the other hand, this initial light leakage can be prevented by manufacturing a curved liquid crystal display device by annealing the liquid crystal display device in a flat state for a long time.

Annealing is a method of making a curved surface by using shrinkage by evaporating moisture of a polarizing plate. Here, in order to increase the shrinking force of the upper polarizer and reduce the contractive force of the lower polarizer, the upper polarizer is attached using a hard type adhesive and the lower polarizer is attached using a soft type adhesive.

However, when the curved surface liquid crystal display manufactured by the annealing method is left at room temperature for a long time, the polarizing plate absorbs moisture and expands, and the polarizing plate expands, and the curved liquid crystal display device is deformed into a flat state again.

At this time, since the expansion force of the upper polarizer is larger than the expansion force of the lower polarizer like the retraction force, the liquid crystal display of the curved state is in a planar state, and the liquid crystal display of the first substrate (110 of FIG. 4) A torsional stress is generated in the opposite direction to the edge when it is deformed from a flat state to a curved state.

By this torsional stress, the alignment axes of the first and second alignment films are bent, and the alignment of the liquid crystal molecules adjacent to the first substrate (110 in Fig. 4) and the inner surface of the second substrate (120 in Fig. 4) Light gaps occur at the four corners.

- Second Embodiment -

FIG. 6 is a schematic sectional view of a curved-surface liquid crystal display device according to a second embodiment of the present invention, FIG. 7 is a cross-sectional view schematically illustrating a liquid crystal panel of a curved-surface liquid crystal display device according to a second embodiment of the present invention, And a pixel region. Here, for convenience, the curved liquid crystal display device is shown in a planar form.

6, the curved-surface liquid crystal display 200 according to the second embodiment of the present invention includes a liquid crystal panel 210 as a display panel, a first polarizing plate 210 disposed on the first side of the liquid crystal panel 210, (260), and a second polarizer (270) positioned on the second side of the liquid crystal panel (210). The curved-surface liquid crystal display device 200 further includes a backlight unit (not shown) positioned under the first polarizer 260.

Referring to FIG. 7, the liquid crystal panel 210 includes a first substrate 220, a second substrate 240, and a liquid crystal layer 250 between the first and second substrates 220 and 240.

A gate wiring (not shown), a gate electrode 222 and a common wiring (not shown) are formed on the inner surface of the first substrate 220. The gate wiring extends along the first direction, and the gate electrode 222 is connected to the gate wiring. The gate electrode 222 may extend from the gate wiring or may be part of the gate wiring. The common wiring extends parallel to the gate wiring along the first direction.

A gate insulating film 224 is formed over the gate wiring and the gate electrode 222 and the common wiring. A gate insulating film 224 may be formed of an inorganic insulating material of silicon nitride (SiNx) or silicon oxide (SiO _2).

A semiconductor layer 226 is formed on the gate insulating film 224 in correspondence with the gate electrode 222. The semiconductor layer 226 includes an active layer 226a of intrinsic amorphous silicon and an ohmic contact layer 226b of an impurity doped amorphous silicon.

Source and drain electrodes 228 and 229 are formed on the semiconductor layer 226. The source and drain electrodes 228 and 229 are spaced apart from the semiconductor layer 226 and the ohmic contact layer 226b is a source And the drain electrodes 228 and 229, respectively. The active layer 226a is exposed between the source and drain electrodes 228 and 229 and the active layer 226a is the same as the source and drain electrodes 228 and 229 except between the source and drain electrodes 228 and 229 Shape.

The gate electrode 222 and the semiconductor layer 226, the source electrode 228 and the drain electrode 229 constitute a thin film transistor T and an active layer 226a exposed between the source and drain electrodes 228 and 229 Is a channel of the thin film transistor T.

Further, a data line (not shown) is formed of the same material in the same layer as the source and drain electrodes 228 and 229. The data line extends along a second direction perpendicular to the first direction and intersects the gate line to define a pixel region. A data line may be connected to the source electrode 228, and a dummy semiconductor pattern having the same structure as the semiconductor layer 226 may be formed under the data line.

A first passivation layer 230 is formed on the source and drain electrodes 228 and 229 and on the data line. The first protective layer 230 may be formed of an inorganic insulating material of silicon oxide (SiO ₂₎ or silicon nitride (SiNx).

A second passivation layer 232 is formed on the first passivation layer 230. The second passivation layer 232 has a flat surface and has a drain contact hole 232a exposing the drain electrode 229 together with the first passivation layer 230. [ The second passivation layer 232 may be formed of organic insulating material of benzocyclobutene (BCB) or photo acryl.

Here, one of the first protective layer 230 and the second protective layer 232 may be omitted.

A pixel electrode 234 and a common electrode 236 are formed in the pixel region above the second passivation layer 232. The pixel electrode 234 contacts the drain electrode 229 through the drain contact hole 232a. The common electrode 236 is disposed alternately in contact with the common wiring and spaced apart from the pixel electrode 234. [ The pixel electrode 234 and the common electrode 236 may be formed of a transparent conductive material such as indium tin oxide or indium zinc oxide.

A black matrix 242 is formed on the inner surface of the second substrate 240. The black matrix 242 has an opening corresponding to the pixel region and may be formed corresponding to a gate wiring (not shown), a data wiring (not shown) and a thin film transistor T. [

A color filter layer 244 is formed under the black matrix 242 to correspond to the openings of the black matrix 242. The color filter layer 244 includes red, green, and blue color filters, and one color filter corresponds to one pixel region, and is sequentially and repeatedly arranged.

Here, the structure in which the color filter layer 244 is formed on the second substrate 240 has been described. However, the color filter layer may be formed on the first substrate 220. That is, the curved liquid crystal display 200 according to the second embodiment of the present invention includes a color filter on TFT (COT) in which a color filter layer is formed on a thin film transistor T on a first substrate 220, ) Structure.

Such a COT structure can increase the aperture ratio by reducing the cohesion margin of the first and second substrates 220 and 240. At this time, the black matrix may be omitted, and if the black matrix is omitted, the aperture ratio can be further increased.

Under the color filter layer 244, an overcoat layer (not shown) may be formed for protecting and planarizing the color filter layer 244. [

A first alignment layer is formed on the pixel electrode 234 and the common electrode 236 of the first substrate 220 and a second alignment layer is formed on the lower portion of the color filter layer 244 of the second substrate 240, . The first alignment layer and the second alignment layer are rubbed or optically aligned in a predetermined direction, and the surfaces of the first alignment layer and the second alignment layer have an orientation.

A liquid crystal layer 250 is positioned between the first alignment layer and the second alignment layer. The liquid crystal molecules of the liquid crystal layer 250 have an initial alignment state according to the alignment directions of the first and second alignment layers.

A first polarizer 260, which is a lower polarizer, is attached to a lower surface of the first side of the liquid crystal panel 210 through a first adhesive layer 262. That is, one side of the first polarizing plate 260 is bonded to the first substrate 220 of the liquid crystal panel 210 (220 of FIG. 7) through the first adhesive layer 262.

The first polarizing plate 260 includes a first polarizing layer 260a and first and second protective films 260b and 260c. The first polarizing layer 260a is located between the first and second protective films 260b and 260c and includes a first protective film 260b, a first polarizing layer 260a, And the second protective film 260c.

The first polarizing layer 260a may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 260b and 260c may be formed of triacetyl cellulose (TAC) And a polymer (cyclic olefin polymer: COP). Here, the first and second protective films 260b and 260c may be referred to as a support film.

A backlight unit (not shown) is disposed under the first polarizer 260 to supply light to the liquid crystal panel 210.

On the other hand, a second polarizing plate 270, which is an upper polarizing plate, is attached to the upper surface, which is the second side of the liquid crystal panel 210, through the second adhesive layer 272. That is, one side of the second polarizer 260 is adhered to the second substrate (240 of FIG. 7) of the liquid crystal panel 210 through the second adhesive layer 272.

The second polarizing plate 270 includes a second polarizing layer 270a and third and fourth protective films 270b and 270c. The second polarizing layer 270a is disposed between the third and fourth protective films 270b and 270c and includes a third protective film 270b and a second polarizing layer 270a from the upper surface of the liquid crystal panel 210, And the fourth protective film 270c.

The second polarizing layer 270a may be made of polyvinyl alcohol (PVA), and the third and fourth protective films 270b and 270c may be made of triacetyl cellulose (TAC) And a polymer (cyclic olefin polymer: COP). Here, the third and fourth protective films 270b and 270c may be referred to as a support film.

Each of the first and second adhesive layers 262 and 272 may be a pressure sensitive adhesive (PSA), and the first and second adhesive layers 262 and 272 may be made of the same material. Alternatively, the first and second adhesive layers 262a and 262b may be made of different materials.

The pressure-sensitive adhesive may be divided into a hardy type, a middle type, and a soft type according to the modulus, more specifically, the storage modulus. The elasticity is preferably 100,000 Pa. When the elastic modulus is 50,000 to 100,000 Pa, it becomes a middle type, and when the elastic modulus is 50,000 Pa or less, it is a soft type.

Here, it is preferable that both the first and second adhesive layers 262 and 272 are of a hard type. At this time, the elastic modulus of the first adhesive layer 262 may be the same as the elastic modulus of the second adhesive layer 272.

Since the first and second adhesive layers 262 and 272 are both of a hard type in the curved-surface liquid crystal display device 200 according to the second embodiment of the present invention, the first and second polarizing plates 260 and 270 In the case of absorbing and expanding, the inflating force of the first polarizing plate 260 and the inflating force of the second polarizing plate 270 are similar, and the curved surface state is maintained. Therefore, it is possible to prevent the curved liquid crystal display device 200 from being deformed into a flat state, and to prevent light leakage.

The bending amount of the curved LCD 200 according to the second embodiment, that is, the distance from the edge to the center of the curved LCD 200, is determined by the first pressure sensitive adhesive 260 of the soft type, The warpage of the curved liquid crystal display device 200 is about 10 mm or more.

A curved surface forming method of the curved surface liquid crystal display device 200 according to the second embodiment of the present invention will be described with reference to the drawings.

8 is a view schematically showing an example of a curved surface forming method of a curved surface liquid crystal display device according to a second embodiment of the present invention.

As shown in Fig. 8, a stage 280 having an upwardly curved upper surface is prepared, and first and second polarizing plates (260 and 270 in Fig. 6) are attached to a liquid crystal panel The liquid crystal display device 200 is placed on the upper surface of the stage 280. Here, the liquid crystal display device 200 is arranged so that the first polarizing plate 260 (FIG. 6) contacts the upper surface of the stage 280, and becomes a convex curved surface state.

Then, the liquid crystal display 200 is manufactured by annealing the liquid crystal display 200 at a predetermined temperature for a long time.

At this time, the annealing should be performed under conditions in which the first and second polarizing plates 260 and 270 are not damaged. In one example, the annealing temperature can be about 110 degrees or less, preferably about 80 degrees or less, and more preferably about 75 degrees. The annealing time may also be about 72 hours.

Here, the curvature radius of the upper surface of the stage 280 is preferably smaller than the curvature radius of the curved surface liquid crystal display 200 manufactured. In addition, the stage 280 is not limited as long as it is formed of a material which is not deformed at the annealing temperature. For example, the stage 280 may be made of aluminum or polypropylene (PP).

Thus, by manufacturing the curved liquid crystal display device 200 by annealing the liquid crystal display device in a curved state for a long time, the stress applied to the display device can be removed, and the initial light leakage can be prevented.

9A and 9B are views schematically showing another example of a curved surface forming method of a curved surface liquid crystal display device according to a second embodiment of the present invention.

9A, a first stage 290 having an upper surface of a convex curved surface shape is prepared, and the liquid crystal panel 210 is disposed on the upper surface of the first stage 290. Next, as shown in Fig. Here, the liquid crystal panel 210 is arranged such that the second substrate (240 in FIG. 7) is in contact with the upper surface of the first stage 290, and is convexly curved.

A first polarizing plate 260 is disposed on the liquid crystal panel 210 and a pressure is applied to the outer surface of the first polarizing plate 260 by using the first roller 291 to form a curved liquid crystal panel 210 The first polarizing plate 260 is attached. At this time, the first adhesive layer 262 (FIG. 6) of the first polarizer 260 contacts the first substrate 220 (FIG. 7) of the liquid crystal panel 210.

Next, as shown in Fig. 9B, a second stage 293 having an upwardly convex curved upper surface is prepared, and the liquid crystal panel 210 attached with the first polarizing plate (260 in Fig. 9A) And is disposed on the upper surface of the substrate 293. Here, the liquid crystal panel 210 is arranged so that the first polarizer (260 in FIG. 9A) is in contact with the upper surface of the second stage 293, and becomes a convex curved surface state.

A second polarizing plate 270 is disposed on the upper portion of the liquid crystal panel 210 and a pressure is applied to the outer surface of the second polarizing plate 270 using the second roller 294, (FIG. 6) is manufactured by attaching the second polarizing plate 270 to the liquid crystal display device (FIG. At this time, the second adhesive layer (272 in Fig. 6) of the second polarizing plate 270 contacts the second substrate (240 in Fig. 7) of the liquid crystal panel 210.

Here, the attaching order of the first polarizing plate 260 and the second polarizing plate 270 may be different, but it is preferable to attach the second polarizing plate 270 after attaching the first polarizing plate 260.

The method of attaching the polarizer in such a curved surface state can eliminate the stress applied to the display device, thereby preventing the initial light leakage. In addition, in the method of attaching the polarizer in the curved surface state, the manufacturing cost can be reduced by simplifying the process equipment as compared with the annealing method, and the manufacturing time can be shortened and the productivity can be increased.

As described above, according to the second embodiment of the present invention, since the curved surface liquid crystal display device 200 (FIG. 6) is manufactured by annealing in the curved surface state or attaching the polarizing plate in the curved state, when the planar display device is artificially bent, So that the light leakage can be prevented. It is also possible to prevent the curved liquid crystal display device 200 (Fig. 6) from being deformed into a planar state by keeping both the first and second adhesive layers 262 and 272 in the hard type and maintaining the curved state And can prevent light leakage.

- Third Embodiment -

10 is a schematic cross-sectional view of a curved liquid crystal display device according to a third embodiment of the present invention.

10, the curved-surface liquid crystal display device 300 according to the third embodiment of the present invention includes a liquid crystal panel 310 as a display panel, a first polarizing plate 310 disposed on the first side of the liquid crystal panel 310, (360), and a second polarizing plate (370) positioned on the second side of the liquid crystal panel (310). The curved-surface liquid crystal display 300 further includes a backlight unit (not shown) positioned under the first polarizer 360.

Here, the liquid crystal panel 310 may have the same structure as that of the liquid crystal panel (210 of FIG. 7) of the curved liquid crystal display device according to the second embodiment shown in FIG.

A first polarizing plate 360, which is a lower polarizing plate, is attached to a lower surface, which is the first side of the liquid crystal panel 310, through a first adhesive layer 362.

The first polarizing plate 360 includes a first polarizing layer 360a and first and second protective films 360b and 360c. The first polarizing layer 360a is disposed between the first and second protective films 360b and 360c and includes a first protective film 360b, a first polarizing layer 360a, and a second protective film 360b from the lower surface of the liquid- And the second protective film 360c.

The first polarizing layer 360a may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 360b and 360c may be formed of triacetyl cellulose (TAC) And a polymer (cyclic olefin polymer: COP).

A backlight unit (not shown) is disposed under the first polarizer 360 to supply light to the liquid crystal panel 310.

On the other hand, the second polarizing plate 370, which is an upper polarizing plate, is attached to the upper surface, which is the second side of the liquid crystal panel 310, through the second adhesive layer 372. That is, the first surface of the second polarizing plate 370 is bonded to the second substrate (not shown) of the liquid crystal panel 310 through the second adhesive layer 372.

The second polarizing plate 370 includes a second polarizing layer 370a and third and fourth protective films 370b and 370c. The second polarizing layer 370a is positioned between the third and fourth protective films 370b and 370c and includes a third protective film 370b, a second polarizing layer 370a, And the fourth protective film 370c.

The second polarizing layer 370a may be made of polyvinyl alcohol (PVA), and the third and fourth protective films 370b and 370c may be made of triacetyl cellulose (TAC) or cyclic olefin And a polymer (cyclic olefin polymer: COP).

A third adhesive layer 374 is formed on the second surface of the second polarizer 370. Therefore, the second adhesive layer 372 is in contact with the third protective film 370b, and the third adhesive layer 374 is in contact with the fourth protective film 370c.

An auxiliary film 376 is formed on the outer surface of the third adhesive layer 374. [ Here, the third adhesive layer 374 may be attached to the auxiliary film 376 and then attached to the fourth protective film 370c of the second polarizing plate 370. Alternatively, the third adhesive layer 374 may be adhered to the fourth protective film 370c of the second polarizing plate 370, and then adhered to the auxiliary film 376. [

The auxiliary film 376 may be an anti-static layer, a hard coating layer, or a low reflective layer, and may have a variety of functions, Lt; / RTI >

Alternatively, the auxiliary film 376 may be a patterned retarder. The patterned retarder includes a left-eye retarder and a right-eye retarder. The left-eye retarder modulates linearly polarized light with left-handed circularly polarized light and outputs right-circularly polarized light with right-circularly polarized light.

Each of the first, second and third adhesive layers 362, 372 and 374 is formed of a first, a second and a third adhesive layer 362, 372, 374 with a pressure sensitive adhesive (PSA) 374 are all of a hard type. At this time, the elastic moduli of the first, second, and third adhesive layers 362, 372, and 374 may be the same.

Here, the first, second and third adhesive layers 362, 372 and 374 may be made of the same material. Alternatively, the first, second and third adhesive layers 362, 372 and 374 may be made of different materials.

Since the first and second adhesive layers 362 and 372 are all of a hard type in the curved-surface liquid crystal display device 300 according to the third embodiment of the present invention, the first and second polarizing plates 360 and 370 In the case of absorbing and expanding, the inflating force of the first polarizing plate 360 and the inflating force of the second polarizing plate 370 are similar to each other, so that the curved surface state is maintained. Therefore, it is possible to prevent the curved liquid crystal display device 300 from being deformed into a flat state, and to prevent light leakage.

In addition, since the third adhesive layer 374 and the auxiliary film 376 are disposed on the second polarizer 370, the warpage of the curved liquid crystal display device 300 is increased due to adhesion stress, and a large curved surface effect can be obtained . For example, the warpage of the curved liquid crystal display device 200 according to the third embodiment of the present invention is about 16 mm.

A curved surface forming method of the curved surface liquid crystal display device 300 according to the third embodiment of the present invention will be described with reference to the drawings.

11A to 11C are views schematically showing an example of a curved surface forming method of a curved surface liquid crystal display device according to a third embodiment of the present invention.

11A, a first stage 390 having an upwardly convex curved upper surface is prepared, and the liquid crystal panel 310 is disposed on the upper surface of the first stage 390. Here, the liquid crystal panel 310 is arranged so that the first substrate (220 in FIG. 7) is in contact with the upper surface of the first stage 390, and is in a convex curved state.

The second polarizing plate 370 is disposed on the liquid crystal panel 310 and pressure is applied to the outer surface of the second polarizing plate 370 by using the first roller 391, The second polarizing plate 370 is attached. At this time, the second adhesive layer (372 in FIG. 10) of the second polarizing plate 370 contacts the second substrate (240 in FIG. 7) of the liquid crystal panel 310.

Next, as shown in Fig. 11B, a second stage 393 having a top surface of a convex curved surface shape is prepared, and the liquid crystal panel 310 to which the second polarizing plate (370 of Fig. 11A) 393, respectively. Here, the liquid crystal panel 310 is arranged such that the second polarizer (370 in Fig. 11A) is in contact with the upper surface of the second stage 393, and is convexly curved.

A first polarizing plate 360 is disposed on the liquid crystal panel 310 and a pressure is applied to the outer surface of the first polarizing plate 360 by using the second roller 394, The first polarizing plate 360 is attached. At this time, the first adhesive layer (362 in FIG. 10) of the first polarizing plate 360 contacts the first substrate (220 in FIG. 7) of the liquid crystal panel 310.

Next, as shown in Fig. 11C, a third stage 396 having an upwardly convex curved upper surface is prepared, and a liquid crystal panel 370 having a first polarizing plate (360 in Fig. 11B) and a second polarizing plate 370 (310 in Fig. 11B) is disposed on the upper surface of the third stage 396. [ 11B) is disposed so that the first polarizing plate (360 of FIG. 11B) is in contact with the upper surface of the third stage 396 and the second polarizing plate 370 is placed on the top, and the liquid crystal panel 310 State.

Subsequently, an auxiliary film 376 is disposed on the upper portion of the second polarizing plate 370 and a pressure is applied to the outer surface of the auxiliary film 376 using the third roller 397 to form a curved polarizing plate 370 The auxiliary film 376 is attached. At this time, the auxiliary film 376 contacts the second polarizing plate 370 through the third adhesive layer (374 in FIG. 10).

Here, the second polarizing plate 370, the first polarizing plate 360, and the auxiliary film 376 are attached in this order. However, it is preferable that the auxiliary film 376 is attached last. In one example, the first polarizing plate 360, the second polarizing plate 370, and the auxiliary film 376 may be attached in this order.

The method of attaching the polarizer in such a curved surface state can eliminate the stress applied to the display device, thereby preventing the initial light leakage. In addition, in the method of attaching the polarizer in the curved surface state, the manufacturing cost can be reduced by simplifying the process equipment as compared with the annealing method, and the manufacturing time can be shortened and the productivity can be increased.

Meanwhile, the curved surface liquid crystal display device according to the third embodiment of the present invention may form a curved surface through the annealing method of FIG.

As described above, in the third embodiment of the present invention, the curved surface liquid crystal display device (300 of FIG. 10) is manufactured by annealing in the curved surface state or by attaching the polarizing plate and the auxiliary film in the curved state, so that the flat display device is artificially bent It is possible to eliminate light stress by eliminating the stress applied locally. The curved surface state of the first, second, and third adhesive layers (362, 372, and 374 in FIG. 10) are all hard type so that the curved surface liquid crystal display device 300 It is possible to prevent light leakage.

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 as defined in the appended claims. It can be understood that

200: Curved Liquid Crystal Display 210: Liquid Crystal Panel
260: first polarizing plate 260a: first polarizing layer
260b: first protective film 260c: second protective film
262: first adhesive layer 270: second polarizer plate
270a: second polarizing layer 270b: third protective film
270c: fourth protective film 272: second adhesive layer

Claims (8)

A liquid crystal panel;
A first polarizer attached to a lower surface of the liquid crystal panel;
A first adhesive layer between the liquid crystal panel and the first polarizer;
A second polarizer attached to an upper surface of the liquid crystal panel;
A second adhesive layer between the liquid crystal panel and the second polarizer,
/ RTI >
Wherein the first adhesive layer and the second adhesive layer are of a hard type having an elastic modulus of 100,000 Pa or more.
The method according to claim 1,
An auxiliary film attached to the upper portion of the second polarizer;
The third adhesive layer between the second polarizer plate and the auxiliary film
Further comprising:
Wherein the third adhesive layer is a hard type.
3. The method of claim 2,
Wherein the auxiliary film is an antistatic layer, a hard coating layer, a low reflection layer, or a patterned retarder.
Preparing a liquid crystal panel;
Attaching a first polarizer to a lower surface of the liquid crystal panel using a first adhesive layer;
Attaching a second polarizer on a top surface of the liquid crystal panel using a second adhesive layer;
Forming a curved surface on the liquid crystal panel
Lt; / RTI >
Wherein the first adhesive layer and the second adhesive layer are of a hard type having an elastic modulus of 100,000 Pa or more.
5. The method of claim 4,
Wherein the step of forming the curved surface is performed after the step of attaching the first polarizing plate and the step of attaching the second polarizing plate and annealing the liquid crystal panel to which the first and second polarizing plates are attached Wherein the curved surface of the curved liquid crystal display device is a curved surface.
5. The method of claim 4,
The step of forming the curved surface may include the step of attaching the first polarizing plate and the step of disposing the liquid crystal panel on a stage having an upper surface of a curved shape, which is performed before the step of attaching the second polarizing plate Wherein the curved surface liquid crystal display device has a curved surface.
The method according to claim 6,
Wherein the step of attaching the first polarizing plate includes the step of attaching the first polarizing plate to the liquid crystal panel disposed on a stage having an upper surface of a convex curved surface shape,
Wherein the step of attaching the second polarizing plate includes the step of attaching the second polarizing plate to the liquid crystal panel disposed on a stage having an upwardly convex curved upper surface .
5. The method of claim 4,
The method of claim 1, further comprising attaching an auxiliary film to a top of the second polarizer using a third adhesive layer, wherein the third adhesive layer is a hard type.

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