KR20180003394A - Polarizer, display device having thereof, and method of fabricating polarizer - Google Patents

Abstract

The present invention provides a polarizing plate capable of preventing the penetration of moisture and preventing crack propagation due to an initial crack. An adhesive is provided on the lateral end side of the polarizing plate to seal the lateral end side of the polarizing plate. The adhesive fills the initial crack of the polarizing plate to prevent the initial crack from propagating into the polarizing plate. Hydrophobic materials are used for a protective film and the adhesive. In a method for manufacturing a polarizing plate according to the present invention, the protective film is attached by applying the adhesive on the outside after cutting only the polarizing unit. The adhesive is hardened and the protective film to which the polarizing unit is attached is cut to be separated into a plurality of polarizing plates. When applying the adhesive, the crack of the polarizing unit is filled with the adhesive so that the adhesive can firmly fix the crack.

Description

TECHNICAL FIELD [0001] The present invention relates to a polarizing plate, a display device having the polarizing plate, and a polarizing plate manufacturing method.

The present invention relates to a polarizing plate and a manufacturing method thereof, and more particularly to a polarizing plate capable of preventing moisture penetration and preventing cracks, a method of manufacturing the polarizing plate, and a display device provided with a polarizing plate.

2. Description of the Related Art Generally, a liquid crystal display device comprises two substrates arranged to face each other at regular intervals and a liquid crystal layer injected between the two substrates. At this time, since the liquid crystal has the short axis and the refractive index anisotropy with respect to the long axis, the refractive index of light is changed while transmitting through the liquid crystal layer, and the desired image is realized by controlling the transmittance of light.

To adjust the transmittance of such light, a polarizing plate is attached to each of the two substrates. At this time, an image is realized by arranging the optical axis direction of the polarizing plate parallel or perpendicular to each other, and adjusting the transmittance of light incident on and outputted from the liquid crystal layer.

Such a polarizing plate may be provided not only in a liquid crystal display but also in an organic light emitting display. The polarizing plate may be disposed on the surface of the organic light emitting display device to transmit light output from the organic light emitting layer in the organic light emitting display device and block light incident from the outside, thereby improving the visibility of the organic light emitting display device.

1 is a view showing a structure of a polarizing plate 10 provided in a conventional display device. As shown in FIG. 1, the conventional polarizing plate 10 includes a polarizing section 12 that transmits light of a specific direction component of incident light, absorbs light components of other directions and polarizes the incident light in a predetermined direction, Adhesives 14 and 15 coated on both sides of the polarizing part 12 and transparent protective films 17 and 18 attached to both sides of the polarizing part 12 by the adhesives 14 and 15 .

The polarizing part 12 is formed by adsorbing iodine or a dichroic dye to a polyvinyl alcohol (PVA) resin film and then stretching the film in one axis to orient iodine or a dichroic dye in one direction, The films 117 and 118 are made of triacetylcellulose (TAC) -based films.

However, the following problems arise in the polarizing plate 10 having such a structure. The polarizing plate 10 is formed by attaching protective films 17 and 18 to both sides of a large-area PVA film with adhesives 14 and 15 to form a coalescence film of a large-area PVA film and protective films 17 and 18 Thereafter, the PVA film and the protective films 17 and 18 are cut mechanically at a time and divided into a plurality of pieces. Therefore, the cross section of the PVA film and the cross section of the protective films 17 and 18 are exposed to the outside as they are on the side end faces of the polarizing plate 10 thus produced.

However, an initial crack (C) is generated in the edge region of the PVA film due to mechanical impact during the cutting of the PVA film having the protective films (17, 18). These initial cracks propagate inside the PVA film as the PVA expands and shrinks due to heat and moisture generated during the process of the display device. The propagation of such cracks is an important cause of the polarizer 10 being broken.

On the other hand, since the PVA is a hydrophilic material, when the polarizing plate 10 is made of such a material, the moisture resistance is lowered and the PVA film is vulnerable to moisture, so that external moisture penetrates into the PVA film. This penetration of water not only lowers the polarization performance of the PVA by increasing the moisture content of the PVA but also causes the initial crack (C) generated during the cutting of the PVA to grow by propagating and shrinking the PVA film, The propagation of such a crack is an important cause of the polarizing plate 10 being broken.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a polarizing plate capable of preventing an initial crack from occurring or an initial crack being generated from growing so as to prevent a polarizing portion from being broken.

Another object of the present invention is to provide a display device provided with the polarizer.

In order to achieve the above object, in order to prevent the side end face of the polarizing portion from being exposed to the outside, an adhesive is disposed on the side end face of the polarizing portion to seal the side end face. Since the side surface of the polarizing portion is not exposed to the outside by the adhesive, it is possible to prevent moisture from penetrating into the polarizing portion, and also to prevent the initial crack generated in the polarizing portion from propagating inside the polarizing portion to propagate .

Further, even when an initial crack is generated in the polarizing portion, since the adhesive fills the initial crack, the crack can be firmly fixed by the adhesive and the initial crack can be prevented from growing. The adhesive may be disposed on the entire outer periphery of the polarizing portion, or on the end face in the direction perpendicular to the stretching direction and the stretching direction of the polarizing portion.

The polarizing part is composed of polyvinyl alcohol (PVA) resin containing iodine or dichromatic dye, and the adhesive is composed of an acrylic material having a hydrophilic group. Further, the protective film is made of an acrylic material.

The adhesive disposed on the side surface of the polarizing portion may be formed to have a thickness of 1 to 10 mu m and a width of 1 to 1.5 mm.

The polarizing plate according to the present invention may be provided with a compensating unit for changing the polarization state of light. The compensation unit prevents the input light from changing the polarization state to degrade the viewing angle characteristic (liquid crystal display element) or decrease the visibility (reflected light) by reflected light (organic electroluminescence display element).

The compensation unit may be composed of a single film or a single layer of a compensation film or a curable liquid crystal having a quarter wave plate (QWP) phase delay characteristic and a Half Wave Plate (HWP) phase delay characteristic, have. In addition, the compensator may be composed of an antispersion compensating material and a positive / negative C-compensating layer.

A display device according to the present invention includes a display panel on which an image is formed, a first adhesive and a second adhesive which are disposed on at least one surface of the display panel and are disposed on the upper and lower surfaces of the polarizing portion, A first protective film and a second protective film adhered to the upper and lower surfaces of the polarizing section by an adhesive, and a polarizing plate including a third adhesive disposed on at least one side of the side surface of the polarizing section and sealing the side surface of the polarizing section, The display panel may be a liquid crystal panel or an organic light emitting display panel.

In the polarizing plate of the present invention, after the plurality of polarizing portions are formed, the adhesive is applied to the lower surface and the upper surface and side surfaces of the polarizing portion, and then the first protective film and the second protective film are attached to the lower surface and the upper surface of the plurality of polarizing portions, And separating the first protective film and the second protective film into a plurality of polarizing plates.

At this time, the step of applying the adhesive includes filling the adhesive provided on the side end face of the polarizing portion with the adhesive, wherein the first protective film and the second protective film are cut at a predetermined distance apart from the polarizing portion. The step of providing a plurality of polarizing portions includes forming a plurality of polarizing portions by processing a polarizing film, and the processing of the polarizing film is performed by a laser or a cutting tool.

The polarizing plate of the present invention comprises a polarizing portion and a first protective film disposed on a first surface of the polarizing portion. The area of the first protective film parallel to the first surface is larger than the area of the first surface of the polarizing portion. Further, the polarizing plate includes a second protective film disposed on the second surface of the polarizing portion. The area of the second protective film parallel to the second surface is larger than the area of the second surface of the polarizing portion. And, the polarizing plate includes an adhesive disposed between the first protective film and the second protective film, and the adhesive covers one or more edge regions of the polarizing portion.

The present invention includes a polarizing plate manufacturing method. The polarizing film is cut and formed in the shape of a polarizing portion. The first protective film is attached to the first surface of the polarizing portion, wherein the area of the first protective film parallel to the first surface is larger than the area of the first surface of the polarizing portion. The adhesive is applied to the polarizing portion to cover one or more edge regions of the polarizing portion. The second protective film is attached to the second surface of the polarizing portion, wherein the area of the second protective film parallel to the second surface is larger than the area of the second surface of the polarizing portion. The adhesive is cured to firmly attach the first protective film and the second protective film to the polarizing portion.

In the present invention, since the polarizing portion is formed in a smaller area than the protective film and the adhesive is provided between the protective films on the side surface of the polarizing portion, the following effects can be obtained.

First, since the side surface of the polarizing portion is sealed by the adhesive in the present invention, it is possible to prevent moisture from permeating from the outside. In addition, in the present invention, not only the protective film is formed of a hydrophobic acrylic material, but also the adhesive uses an acrylic adhesive having a small number of characteristics, so that moisture permeation from the outside can be effectively prevented.

Secondly, according to the present invention, cracks can be prevented from propagating into the inside of the polarization unit. When an initial crack occurs in the polarizing portion due to external impact or the like during the process, the adhesive fills the initial crack. Therefore, since the initial crack is firmly fixed by the adhesive, the initial crack does not grow. Moreover, since the side face on which the initial crack is formed is sealed by the adhesive, moisture and heat, which cause growth of the initial crack, are blocked by the adhesive, so that propagation of the initial crack can be prevented.

1 is a view showing the structure of a conventional polarizer.
2A and 2B are diagrams showing the structure of a polarizing plate according to a first embodiment of the present invention, respectively.
3 is a view showing another structure of a polarizing plate according to the first embodiment of the present invention.
4 is a view showing a method of manufacturing a polarizing plate according to the first embodiment of the present invention.
5 is a view showing an apparatus for manufacturing a polarizing plate according to the first embodiment of the present invention.
6 is an enlarged view of area A in Fig. 2B; Fig.
7A and 7B are diagrams showing cracks generated in the polarization unit according to the present invention, respectively.
8A and 8B are plan views of a polarizing plate according to the present invention.
9A and 9B are views showing a polishing roll used in the production of a general polarizing plate.
10A to 10C are views showing polishing of a polarizing plate of a specific shape by a polishing roll;
11A to 11C are views showing the shape of a polarizing plate according to the present invention.
12A and 12B are diagrams showing the structure of a polarizing plate according to a second embodiment of the present invention.
13 is a view showing a method of manufacturing a polarizing plate according to a second embodiment of the present invention.
14 is a view showing an apparatus for manufacturing a polarizing plate according to a second embodiment of the present invention.
15 is a view showing another manufacturing method of the polarizing plate according to the second embodiment of the present invention.
16 is a view showing another apparatus for manufacturing a polarizing plate according to the second embodiment of the present invention
17A to 17C are views showing the structure of a display device according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B are views showing the structure of a polarizing plate 110 according to the present invention.

2A and 2B, the polarizer 110 according to the present invention includes a polarizer 112 for transmitting only light having a predetermined direction component in the light incident on the optical axis formed in the uniaxial direction, A first protective film 117 and a second protective film 117 attached to the lower surface and the upper surface of the polarization section 112 by the adhesive 114, 118).

The polarizing section 112 is a film that can convert natural light into arbitrary polarized light. At this time, when the incident light is divided into two polarization components orthogonal to each other, the polarization unit 112 has a function of passing one polarization component of two polarization components and absorbing, reflecting, or scattering the other polarization components Can be used. As the optical film used for the polarizer 112, a polymer film containing polyvinyl alcohol (PVA) based resin containing iodine or a dichroic dye may be used. At this time, the iodine or the dichroic dye is uniaxially stretched to orient iodine or a dichroic dye in one direction.

In the present invention, the polarizer 112 may be made of a material other than the PVA resin. For example, an O-type polarizer in which a liquid crystal composition containing a dichroic substance and a liquid crystal compound are aligned in a certain direction and an E-type polarizing material in which a lyotropic liquid crystal is oriented in a certain direction can be used.

The first protective film 117 and the second protective film 118 are formed of a transparent film having no phase delay to protect the polarization section 112 from external moisture or contamination. The first protective film 117 and the second protective film 118 may be mainly composed of triacetyl cellulose (TAC), polyethylene terephthalate (PET), cycloolefin polymer (COP) Can be used.

Particularly, in the present invention, an acrylic film may be used for the first protective film 117 and the second protective film 118. When the prepared polarizing plate 110 is exposed to a high humidity environment, the moisture permeates into the polarizing portion 112 through the first protective film 117 and the second protective film 118, Can be prevented.

When water penetrates into the polarization section 112, not only the polarization function of the polarization section 112 is lowered but also the initial cracks formed in the polarization section 112 due to the expansion and contraction of the polarization section 112 due to moisture And propagates to the interior of the polarization section 112, thereby causing the polarizer 110 to become defective. Therefore, in the present invention, the first protective film 117 and the second protective film 118 for protecting the polarizing part 112 are made of a material having a small number of properties, so that the first protective film 117 and the second protective film 118 It is possible to prevent moisture infiltration through the air vent 118.

In addition, the first protective film 117 and the second protective film 118 may be surface-treated. When the polarizing plate 110 is applied to the organic light emitting display device, the polarizing plate 110 is disposed on the front surface of the organic light emitting display device to block light reflected from the display device under the polarizing plate 110, thereby improving the visibility of the display device. The surface of the first protective film 117 and the second protective film 118 are treated to prevent light reflected from the display device under the polarizing plate 110 from being shielded as well as to protect the surface of the polarizing plate 110, The light reflected from the first protective film 117 and the second protective film 118 is blocked or scattered to improve the visibility.

The surface treatment of the first protective film 117 and the second protective film 118 may be performed by a hard coating method in which the strength of the reflected light is lowered by coating an inorganic film and an organic film with high strength on the surface of the protective film, An anti-glare (AG) method in which a transparent insulating film in which beads or polymer beads are scattered is formed to scatter reflected light, an LR (Low Reflection) in which a prism is formed on the surface to scatter reflected light, a plurality of low- And an AR (Anti-Reflection) method in which reflected light is canceled by a difference in refractive index between alternately arranged layers. However, the present invention is not limited to this method, and various methods can be applied.

At this time, both the first protective film 117 and the second protective film 118 may be surface-treated, but when applied to the organic electroluminescent display device, only the second protective film 118 disposed on the viewer side is surface-treated It might be.

The adhesive 114 adheres the first protective film 117 and the second protective film 118 to the lower surface and the upper surface of the polarizing portion 117, respectively. As shown in the drawing, the adhesive 114 includes a first region 114a disposed on the lower surface of the polarizing section 112 and attached to the lower surface of the polarizing section 112, A second area 114b which is disposed on the upper surface of the polarizer 112 and attaches the second protective film 118 to the upper surface of the polarizer 112 and a second area 114b which is disposed on both sides of the polarizer 112, And a third region 114c for sealing the side face of the polarizing section 112 and fixing the first protective film 117 and the second protective film 118 at the outer periphery of the polarizing section 112. [

As shown in FIG. 2A, the adhesive 114 may be composed of two layers partitioned around the polarizing portion 112, and the adhesive 114 may be a single layer as shown in FIG. 2B have.

As described above, the adhesive 114 of the polarizing plate 110 of the present invention may be formed of two layers or one layer, but in the above description and the following description, the functional aspects of the adhesive 114 Third region 114a, 114b, and 114c will be described.

 It is preferable that the first adhesive 114 is a hydrophobic adhesive and a photo-curable acrylic material.

The acrylic adhesive 114 of the present invention is composed of at least one acrylic monomer having a hydrophilic group, a radical polymerization initiator, an epoxy resin, an iodine initiator as a cationic photopolymerization initiator, and a photosensitizer.

More specifically, the adhesive material may comprise 5-70 wt% of one or more acrylic monomers having a hydrophilic group, 0.5-10 wt% of a radical polymerization initiator, 30-90 wt% of an epoxy resin, 1-10 wt% of an iodine initiator, 0.0001-5% by weight. Preferably, the adhesive material comprises 20-60 wt% of one or more acrylic monomers having a hydrophilic group, 0.5-5 wt% of a radical polymerization initiator, 40-80 wt% of an epoxy resin, 2-8 wt% of an iodine initiator, 0.0005-3% by weight.

When the content of the acrylic monomer having a hydrophilic group is less than 5% by weight, the adhesive strength is lowered. When the content of the acrylic monomer is more than 70% by weight, the water resistance and adhesive strength of the polarizer 110 deteriorate. When the epoxy resin is less than 30% by weight, the effect of improving the water resistance and durability is deteriorated. When the epoxy resin is more than 90% by weight, compatibility and viscosity increase. When the content of the radical polymerization initiator is less than 0.5% by weight, the content of the cationic polymerization component increases to lower the curing rate. When the amount exceeds 10% by weight, there is a problem of compatibility and optical durability. If the amount of the iodine initiator is less than 1% by weight, the curing property of the adhesive 114 may be lowered to cause no curing. If the amount exceeds 10% by weight, there is a problem with endurance optical properties. When the photosensitizer is less than 0.0001, there is a problem that the reactivity of the iodine initiator is deteriorated. When the photosensitizer is more than 10% by weight, the color properties of the sensitizer and the optical properties related to high refractive index may be affected.

The epoxy resin constituting the adhesive material preferably comprises a combination of a first epoxy compound containing at least one epoxidized aliphatic ring group and a second epoxy compound containing at least one glycidyl ether group.

The epoxidized aliphatic cyclic group of the first epoxy compound is preferably an epoxidized cyclohexyl group, more preferably a 3,4-epoxycyclohexylmethyl group, and is preferably 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane At least one material selected from the group consisting of carboxylate, bis (3,4-epoxycyclohexylmethyl) adipate dicyclopentadienedioxide, limonene dioxide and 4-vinylcyclohexenedioxide.

The second epoxy compound is not particularly limited as long as it contains at least one glycidyl ether group, and more specifically, 1,4-cyclohexanedimethanol diglycidyl ether, novolac epoxy, bisphenol A epoxy, F-based epoxy, brominated bisphenol-based epoxy, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, n-butyl glycidyl ether, aliphatic glycidyl ether (C12- -Ethylhexyl glycidyl ether, phenyl glycidyl ether, o-cresyl glycidyl ether, and nonylphenyl glycidyl ether.

The hydrophilic group of the acrylic monomer may be a hydroxyl group (-OH), a carboxyl group (-COOH), or the like, and preferably a hydroxyl group (-OH). Specific examples of the monomer having a hydrophilic group include hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, and mixtures thereof And includes monomers containing hydrophilic groups well known in the art.

The cationic photopolymerization initiator is a compound which produces a cationic species or a Lewis acid by irradiation with an active energy ray. The cationic photopolymerization initiator usable in the present invention is preferably an iodine initiator.

The iodine initiator may be used in an amount of 1-10% by weight, preferably 2-8% by weight, more preferably 3-5% by weight, based on 100% by weight of the adhesive composition. The photosensitizer may be used in an amount of 0.0001-5 wt%, preferably 0.0005-3 wt%, more preferably 0.001-2 wt%.

As described above, in the present invention, an acrylic adhesive is used as the adhesive 114, and since the acrylic material has hydrophobicity, the polarizer 110 of the present invention can prevent moisture penetration through the adhesive 114. Of course, the adhesive of the present invention is not limited to acrylic adhesive but any adhesive material can be used as long as it is a hydrophobic adhesive.

As described above, when water permeates the polarizing section 112, not only the polarization function of the polarizing section 112 is degraded but also the polarizing section 112 is formed by the expansion and contraction of the polarizing section 112 due to moisture However, in the present invention, since the adhesive 114 is made of a material having a small number of properties, it is possible to prevent the moisture from penetrating through the adhesive 114 .

On the other hand, the acrylic monomer constituting the adhesive 114 contains a hydrophilic group, which is for the purpose of improving the adhesive strength. That is, since the PVA film constituting the polarizing section 112 is a hydrophilic material, when the hydrophilic polarizing section 112 is coated with a hydrophobic adhesive agent (for example, an acrylic adhesive agent) to adhere the protective films 117 and 118, The adhesion of the adhesive 114 is weakened. In order to prevent such deterioration in adhesion, the present invention enhances the adhesive force of the adhesive 114 by adding a hydrophilic group to the hydrophobic acrylic monomer to improve the bonding force between the hydrophobic acrylic adhesive 114 and the hydrophilic polarizer 112.

At this time, by adding 5-70% by weight of one or more acrylic monomers having a hydrophilic group to the adhesive 114, it is possible to improve adhesion to the polarizer 112 and prevent moisture from penetrating into the polarizer 112.

However, the adhesive of the present invention is not limited to the photo-curing adhesive of the above-mentioned constitution, but various kinds of adhesives known at present, such as a thermosetting adhesive, may be used.

As shown in FIGS. 2A and 2B, the polarization unit 112 is configured to be smaller than the areas of the first protective film 117 and the second protective film 118. In particular, the area of the first surface (i.e., the lower surface) of the polarizing portion 112 to which the first protective film 117 is attached is smaller than the area of the surface of the first protective film 117 parallel to the first surface. The area of the second surface (i.e., the upper surface) of the polarizing portion 112 to which the second protective film 118 is attached is smaller than the area of the surface of the second protective film 118 parallel to the second surface. Therefore, the first protective film 117 and the second protective film 118 are arranged to extend from the sides of the polarization section 112 by a certain distance. A third region 114c of the adhesive 114 is disposed between the first protective film 117 and the second protective film 118 outside the polarizing section 112 so that the adhesive 114 is sandwiched between one of the polarizing sections 112 In the present invention, the third region 114c is disposed between the first protective film 117 and the second protective film 118, while the outer edge of the polarizing portion 112 is exposed to the outside in the conventional polarizer, Thereby sealing the side end surface of the polarization section 112. [ Thus, at least one edge of the polarizing portion 112 is covered by the third region 114c of the adhesive 114.

At this time, the first region 114c and the second region 114b of the adhesive 114 are formed to be about 1-10 占 퐉, respectively. The thickness a of the third region 114c of the adhesive 114 is preferably about 2 to 35 mu m since the thickness of the polarizing portion 112 is formed to be 1-15 mu m. The width (b) of the third region 114c is preferably about 1 mu m to 1.5 mm. Of course, the thickness of the first region 114a, the second region 114b, the third region 114c, and the polarizing portion 112 of the adhesive 114 of the present invention and the width of the third region 114c may be different from the above- It is not limited to the width, but any thickness and width can be used as long as it can completely seal the polarizing portion 112 to prevent moisture permeation from the outside.

In the meantime, although the adhesive 114 is composed of two adhesive layers or one adhesive layer in the drawing, the adhesive 114 may be formed of a separate adhesive layer composed of three layers.

3 is a view showing another structure of the polarizing plate 110 according to the present invention.

3, the polarizer 110 according to another structure of the present invention includes a polarizer 112 and a first adhesive 114 and a second adhesive 115, The first protective film 117 and the second protective film 118 attached to the lower surface and the upper surface of the polarizing section 112 and the first protective film 117 and the second protective film 118 outside the polarizing section 112 And a third adhesive 116 that seals the side surface of the polarizing portion 112 and covers at least one edge of the polarizing portion 112.

The third adhesive 116 may use the same adhesive material as that of the first adhesive 114 and the second adhesive 115, or other adhesive material may be used. However, in the present invention, it is preferable to use a hydrophobic adhesive material in order to prevent moisture penetration from the outside, and in particular, it is preferable to use a hydrophobic adhesive material having a hydrophilic group for bonding with the polarizer 112 which is a hydrophilic material.

The first adhesive 114 and the second adhesive 115 are formed to have a thickness of about 1 to 10 mu m and the third adhesive 116 has a thickness of 1 to 15 mu m Thickness. Further, it is preferable that the third adhesive 116 has a width of about 1 탆 - 1.5 mm. However, the thickness of the first to third adhesives 114, 115, and 116 and the polarizer 112 and the width of the third adhesive 116 are not limited to the above thickness and width, but the polarizer 112 may be completely sealed, Any thickness and width is possible as long as it prevents penetration.

FIG. 4 is a flow chart showing a manufacturing method of a polarizing plate 110 according to the present invention. FIG. 5 is a device for manufacturing an actual polarizing plate 110. Referring to these drawings, a method of manufacturing a polarizing plate 110 according to the present invention Will be described in detail.

5, the polarizer manufacturing apparatus 200 includes a first supply roll 210 for stretching the PVA film 250 to supply the PVA film 250 to the guide film 240, a first protective film 254 made of an acrylic film A second supply roll 220 and a third supply roll 227 for supplying the first protective film 256 and the second protective film 256, a first guide roll 215 for guiding the PVA film 250, A third guide roll 225 and a fourth guide roll 228 for guiding the first protective film 254 and the second protective film 256 and the first protective film 254 to the PVA A second lapping roll 236 for attaching the second protective film 256 to the PVA film 250 and a second lapping roll 236 for peeling the guide film 240 A first adhesive supply portion 282 and a second adhesive supply portion 284 for supplying an adhesive to the peeling roll 217 and the first and second adhesion rolls 235 and 236 and the PVA film 250, (260) for curing the adhesive applied to the PVA film (250) And a curing device 265 for attaching the caller film 254 and the second protective film 256 to the PVA film 250.

4, after the PVA film 250 is stretched in the polarizer producing apparatus 200 having the above-described structure, the PVA film 250 is joined to the guide film 240, and the guide roll 215 The PVA film 250 and the guide film 240 are transported.

The PVA film 250 is cut to form at least one polarizing portion (S102). On the first surface of the polarizing portion, the first protective film is attached to the first surface of the polarizing portion (S102). At this time, the area of the surface of the first protective film parallel to the first surface is larger than the area of the first surface of the polarizing portion. The adhesive is applied to the polarizing portion to cover at least one edge of the polarizing portion (S103). The second protective film is attached to the second surface of the polarizing portion (S104). At this time, the area of the surface of the second protective film parallel to the second surface is larger than the area of the second surface of the polarizing portion. The adhesive is cured and the protective film is firmly attached to the polarizing portion.

The lamination of the PVA film 250 and the guide film 240 may be provided with a separate adhesive means and may be laminated by the van der Waals force of the PVA film 250 and the guide film 240 without separate adhesive means It is possible. Since the PVA film 250 and the guide film 240 are peeled off in the subsequent process, when the PVA film 250 and the guide film 240 are laminated with the adhesive material, it is preferable to use an adhesive material having a low adhesive force .

Thereafter, the PVA film 250 bonded to the guide film 240 is processed using a processing device 260 such as a laser to form at least one polarizing portion. At this time, since only the PVA film 250 is processed and the guide film 240 is not processed, a plurality of the processed PVA films 250 exist on the upper surface of the guide film 240. Although a mechanical cutting tool can be used as the processing device 260, it may be preferable to use a laser in that the PVA film 250 is not mechanically impacted. The processing of the PVA film 250 depends on the shape of the display device to which the polarizing plate is applied. For example, when the display device is a square or a rectangular shape, the polarizer provided on the display device is also formed in a square shape or a rectangular shape, so that the PVA film 250 is also formed in a square shape or a rectangular shape. In addition, when the display device has a specific shape such as a polygonal shape having a stepped shape and a non-rectangular shape, or a circular shape or an elliptical shape, the processed PVA film 250 may also be a polygonal shape having a stepped shape and a non- And is formed in a corresponding shape.

Of course, as shown in Fig. 2, since the adhesive is disposed on the side surfaces of the four sides of the polarizing portion, the PVA film 250 is processed to have an area smaller than that of the polarizing plate to be produced.

After the first protective film 254 and the second protective film 256 are supplied using the second supply roll 220 and the third supply roll 227, the first and second rolls 235, The first protective film 254 and the second protective film 256 supplied using the adhesion roll 236 are attached to the upper and lower surfaces of the PVA film 250, respectively. A first adhesive supply part 282 and a second adhesive supply part 284 are provided near the first adhesion roll 235 and the second adhesion roll 236 to apply adhesive to the upper and lower surfaces of the PVA film 250 The first protective film 254 and the second protective film 256 are attached to the upper and lower surfaces of the PVA film 250, respectively.

As shown in the drawing, a first lapping roll 235 is disposed at the front end of the second lapping roll 236. [ After the first protective film 254 is attached to the first surface of the PVA film 250 and the PVA film 250 is peeled off by a first guide roll 215 and a second guide roll 245 And then the second protective film 256 is attached to the lower surface of the PVA film 250.

On the other hand, only one of the first adhesive supply portion 282 and the second adhesive supply portion 284 may be provided. For example, when the first protective film 254 and the second protective film 256 are attached by one adhesive as shown in FIG. 2B, the upper and lower surfaces of the PVA film 250 The first protective film 254 and the second protective film 256 can be attached to the PVA film 250 by supplying an adhesive to cover the entire surface of the PVA film 250.

A peeling roll 217 is provided between the first adhesion roll 235 and the second adhesion roll 236 to peel the PVA film 250 from the guide film 240. The first protective film 254 is attached to the plurality of PVA films 250 individually processed by the first adhesion roll 235 so that the PVA film 250 is peeled off from the guide film 240, The plurality of PVA films 250 remain attached to the first protective film 254 and the adhesive is supplied to the lower surface of the PVA film 250 peeled off from the second adhesive supply part 284, The lower surface of the second protective film 256 of the peeled PVA film 250 is adhered using the roll 236.

The PVA film 235 is a plurality of separated films and the first protective film 254 and the second protective film 256 are formed in a long film shape similar to the widths of the first and second cohesive rolls 235 and 236 The first protective film 254 and the second protective film 256 are attached to the upper and lower surfaces of the PVA film 235 as well as the first protective film 254 and the second protective film 256 are attached to each other. At this time, an adhesive is supplied from the second adhesive supply part 284 between the first protective film 254 and the second protective film 256, and this adhesive covers one or more edges of the PVA film 235.

Thereafter, the adhesive between the PVA film 250 and the first protective film 254 and the second protective film 256 is cured by using the curing device 265. When the adhesive used in the present invention is a photocurable adhesive, the curing unit 265 may be a light irradiation apparatus for irradiating light such as ultraviolet rays, and may be a heating apparatus for applying heat at a high temperature when the adhesive is a thermosetting adhesive .

Then, a plurality of PVA films 250, the first protective film 254 and the second protective film 256 are cut to complete a plurality of polarizing plates. At this time, the cutting of the PVA film 250, the first protective film 254 and the second protective film 256 is cut along the shape of the PVA film 250, For example, 1 um-1.5 mm).

The PVA film 250 is smaller in area than the first protective film 254 and the second protective film 256 and the PVA film 250 An adhesive may be disposed between the first protective film 254 and the second protective film 256 of the outer region of the PVA film 250 so as to seal at least one edge of the PVA film 250.

The polarizing plate is manufactured by attaching the first protective film 254 and the second protective film 256 on both sides of the PVA film 250 and then attaching the PVA film 250 and the first protective film 254, The second protective film 256 is cut at a time by a mechanical cutting device to form a plurality of polarizing plates so that not only the cross section of the cut PVA film 250 is exposed to the outside but also the mechanical force is applied to the PVA film 250 as it is .

Therefore, in the conventional polarizing plate, an initial crack is generated in the PVA film 250 exposed to the outside by a mechanical force applied at the time of cutting. Generally, it is known that, when an initial crack occurs on a film composed of an organic material, cracks grow due to the stress caused by the expansion and contraction of the film when the initial crack size is larger than the set size. For example, it is known that when the initial crack size in the cross section of the film is 40 μm or more, the initial crack grows toward the inside of the film, and the film is completely torn.

In the conventional polarizing plate, an initial crack occurs in the PVA film 250 due to the mechanical force at the time of cutting. In addition, high temperature heat is applied in the display device manufacturing process of the polarizing plate, and moisture permeates through the cut surface exposed to the outside. This heat and moisture expands and contracts the PVA film 250 and the initial crack grows due to such expansion and contraction to propagate the crack into the PVA film 250. Eventually, Which causes it to be completely destroyed.

Meanwhile, in the conventional polarizing plate manufacturing process, after the PVA film 250, the first protective film 254 and the second protective film 256 are cut off to remove an initial crack generated by a mechanical impact, The initial cracks are removed by polishing the cut surface through the process. However, in order to perform such a polishing process, a polishing apparatus separate from the polarizing plate producing apparatus is provided, and the polarized plate thus cut is transferred to the polishing apparatus and the transferred polarizing plate is polished by the polishing apparatus, so that the manufacturing process is delayed. Furthermore, since a separate polishing apparatus must be provided, the manufacturing cost is greatly increased.

Conventionally, since a polishing apparatus for polishing a polarizing plate is mainly composed of a disk-shaped polishing roll, it has been difficult to polish a polarizing plate having an irregular shape such as a circular shape or an elliptical shape instead of a rectangular shape. As a result, It became impossible.

On the other hand, according to the present invention, breakage of the PVA film 250 due to propagation of initial cracks can be prevented, so that a separate polishing apparatus is not required, so that it is possible to effectively prevent a delay in the manufacturing process and an increase in manufacturing cost . Furthermore, since polishing is not necessary, it is possible to manufacture polarizing plates of various shapes, and it becomes possible to manufacture display devices of various shapes.

Further, in the present invention, when an initial crack occurs on the cut surface of the PVA film 250, that is, on the side surface of the polarizing portion of the polarizing plate upon cutting the PVA film 250, It can be prevented from propagating, which will be described in more detail with reference to FIG.

6 is an enlarged view of region A in Fig. 2B, showing the boundary region between the polarizing portion 112 of the polarizing plate 110 and the third adhesive 116. Fig.

6, a first region 114a and a second region 114b of the adhesive 114 are provided on the upper and lower surfaces of the polarizer 112 to sandwich the first and second protective films on the polarizer And the third region 114c of the adhesive 114 is disposed on the side end face of the polarizing section 112 to seal the polarizing section 112. [

The polarizing section 112 is processed by a processing device 260 of a polarizing plate producing apparatus. The processing device 260 is a laser or a cutting device, and an initial crack is generated in the cut surface of the polarization part 112 processed by the processing device 260.

7A and 7B are photographs showing actual initial cracks occurring in the polarization unit 112. FIG. 7A is a view showing an initial crack generated along the stretching direction of the polarizing portion, and FIG. 7B is a view showing an initial crack occurring along a direction perpendicular to the stretching direction of the polarizing portion. At this time, the crack is indicated by a red line.

7A, an initial crack having a size of about 890 mu m or less is generated along the stretching direction of the polarization section 112 at the time of processing the polarization section 112, and as shown in Fig. 7B, An initial crack having a size of not more than 100 mu m is generated along the vertical direction of the stretching direction.

Generally, when the initial crack size in the stretching direction is 40 占 퐉 or more, a crack is generated on the side surface of the polarization section 112 due to the stress of the polarization section 112 and propagates to the inside of the polarization section 112, The crack is propagated inside the polarization section 112 and the polarization section 112 is broken.

In the present invention, however, even when the initial crack C is generated, the third region 114c of the adhesive 114 is filled in the open interior of the initial crack C, so that the initial crack C Is firmly fixed. Therefore, even if the polarization unit 112 expands and contracts, no stress is applied to the initial crack C, so that the crack C does not grow. As a result, the crack C enters the polarization unit 112 It is not propagated.

Furthermore, since the third region 114c of the adhesive 114 covers at least one side end face of the polarizing portion 112, when heat is applied from the outside, the third region 114c reaches the polarizing portion 112 It is possible to prevent crack propagation due to expansion and contraction of the polarization section 112. In addition, it is possible to prevent crack propagation due to heat expansion and contraction of the polarization section 112 due to heat. Since the third region 114c can prevent moisture infiltration at the side surface of the polarizing section 112 and prevent the polarizing section 112 from expanding and contracting, Crack propagation due to expansion and contraction can be prevented.

In other words, in the present invention, by providing the third region 114c covering one or more edges of the polarization section 112, even if an initial crack C is generated, the adhesive component can securely fix the initial crack C In addition, by preventing the expansion and contraction of the polarization unit 112 itself due to heat and moisture, the initial crack C can be prevented from propagating into the polarization unit 112 due to stress. In other words, although the third region 114c of the adhesive 114 can effectively prevent the initial crack C having a small size from propagating into the polarization portion 112, Even when an initial crack C having a size of 탆 or more occurs in the polarization section 112, the adhesive material can firmly fix the initial crack C to prevent the crack from propagating into the polarization section 112 .

According to the present invention, when an initial crack of 40 to 1.5 mm is generated in the polarization unit 112, the initial crack can be prevented from propagating into the polarization unit 112 by the adhesive material.

The third region 114c of the adhesive 114 may be disposed along the entire outer edge of the polarizer 112, but may be disposed on only a part of the outer edge of the polarizer 112, which will be described with reference to the drawings.

8A and 8B are plan views showing the structure of a polarizing plate 110 according to the present invention.

8A, the first and second protective films 117 and 118 are formed to have a larger area than the polarizing section 112, so that the four sides of the first and second protective films 117 and 118 are separated from the four sides of the polarizing section 112 Lt; / RTI > When the initial cracks C are formed on all the end faces of the polarizing portion 112, the third region 114c of the adhesive 114 is sandwiched between the first and second protective films 117 and 118 on the outer periphery of the polarizing portion 112 The entire outer edge of the polarization section 112 is sealed by the third region 114c so that the initial crack C can be prevented from propagating inside the polarization section 112. [

The initial crack c may be generated only in a partial region of the polarization section 112, as shown in Fig. 8B. The polarizing section 112 has a polarizing property by stretching iodine or a dichroic dye or the like in one direction. Therefore, when the initial cracks C are generated in the polarization unit 112, the major axes of the iodine or dichromatic dye are oriented in one direction in the polarization unit 112. Therefore, when the initial cracks C are generated in the polarization unit 112, And propagates to the inside of the polarization section 112.

As described above, when the polarizing section 112 is cut, an initial crack having a size of about 890 탆 or less is generated along the stretching direction of the polarizing section 112, and an initial crack is generated along the direction perpendicular to the stretching direction of the polarizing section 112 An initial crack having a size of 탆 or less occurs. That is, the size of the initial crack generated in the vertical direction is much smaller than the stretching direction of the polarization section 112. In the case of the stretching direction, the initial crack grows when the initial crack size is 40 탆 or more, but the initial crack does not grow even when the initial crack size is 40 탆 or more in the direction perpendicular to the stretching direction.

Therefore, only the initial cracks formed on the side surfaces corresponding to the stretching direction are propagated to the inside of the polarization section 112 by heat application and moisture penetration, so that the initial crack C is mainly generated in the stretching direction of the polarization section 112 . Therefore, in the present invention, the third region 114c of the adhesive 114 is disposed only in the region where the crack propagated along the stretching direction of the polarizing section 112 is generated, and the third region 114c is not disposed in the other region As a result, the maximum effect can be obtained by using the minimum adhesive. For example, when the rectangular polarization section 112 is formed, since the initial crack C formed on the side propagated in the stretching direction of the polarization section 112 is an initial crack formed on the side end face in the stretching direction, The third region 114c of the adhesive 114 may be formed only on the side surface perpendicular to the first region 114c.

However, the adhesive 114 is provided not only at the edge where the crack occurs in the stretching direction of the polarizing portion 112 but also at the edge where the crack propagates in the direction perpendicular to the stretching direction, thereby more reliably preventing the propagation of the initial crack .

The polarizing plate 110 of the present invention may be formed in various shapes. For example, it may be formed into a square shape that is applied to electronic devices such as a TV, a notebook computer, a tablet computer, and a mobile phone, but it can be particularly effectively applied to a shape other than a rectangular shape.

9A and 9B are views showing a device for polishing a cross section after the production of the conventional polarizer shown in Fig. As shown in FIG. 9A, the polishing apparatus includes a polishing roll 300 having a disk shape and a plurality of polishing blades 310 and 312 arranged along the edge of one side of the polishing roll 300.

The polishing roll 300 rotates about the rotation axis 320 and the polishing blades 310 and 312 rotate as the polishing roll 300 rotates to polish the polarizing plate 340. A plurality of polishing blades 310 and 312 can be mounted along the circumference at the edge area of one side of the polishing roll 300, but generally two polishing blades 310 and 312 are disposed.

The first polishing blade 310 has a height greater than that of the second polishing blade 312 so that the polarizing plate is first polished by the first polishing blade 310 during polishing of the polarizing plate 340, ). ≪ / RTI >

1 can be removed by polishing the side surface of the conventional polarizing plate 10 shown in Fig. 1, so that an initial crack generated on the side surface of the polarizing plate 10 can be removed, It is possible to prevent breakage of the polarizing plate 10 due to cracking.

However, in the case of such a polishing apparatus, there may arise a problem in polishing a polarizing plate of a specific shape due to a structural problem and a geometrical problem of the polishing roll 300.

10A to 10C are views showing polishing of a polarizing plate having a specific shape by a polishing apparatus.

As shown in Fig. 10A, there may occur a problem in polishing the first surface of the polarizing plate 340 composed of the inclined surface and the horizontal surface arranged at a certain angle ([theta]) from the inclined surface with the polishing apparatus. Since the polishing apparatus has a disk shape and the polishing blades 310 and 312 are disposed along the edge area of the circular plate 300, when the end face of one side of the polarizing plate 340 having an angle is polished, the polishing roll 300 has a step The edge of the stepped area bent inward can not be polished. Particularly, there arises a problem in polishing the cross section of the region near the step.

At this time, although it depends on the diameter of the polishing roll 300 of the polishing apparatus and the arrangement position of the polishing blades 310 and 312, if the step angle? Of the sides adjacent to each other is 180 degrees or less (? There is a problem in polishing the area near the bent area according to the structure and the shape, and when the angle? Between adjacent sides becomes an acute angle (? ≪ 90 占, polishing of the bent area becomes impossible.

As shown in Fig. 10B, even when the polarizing plate 340 has a curved shape (i.e., a shape having a partial curvature), a problem may occur in polishing with the polishing apparatus. That is, since the polishing roll 300 of the polishing apparatus linearly moves in a rotating state and polishes the cut surface of the polarizing plate 340, it is impossible to polish the cut surface formed by the curved line.

Of course, the cutting surface can be polished while moving the polishing roll 300 several times along the curved surface. However, in this case, it is necessary to repeat the polishing several times, so that it takes much time to manufacture the polarizing plate. In addition, in spite of repetition of polishing several times, there is a problem in that a non-polished area is generated in the curved surface of the polarizing plate 340, crack propagates through the initial cracks in this area, and the polarizing plate is damaged.

In addition, as shown in FIG. 10C, when the hole 342 is formed in the polarizing plate 340, there arises a problem in polishing with the polishing apparatus. The polishing roll 300 of the polishing apparatus linearly moves to polish the cut surface of the polarizing plate 340, so that the cut surface of the curved hole 342 can not be polished. When the hole 342 is smaller than the polishing roll 300, the polishing roll 300 can not be positioned inside the hole 342, so that the cutting face of the hole 342 can not be polished.

The holes 342 formed in the polarizing plate 340 may have various shapes such as a polygonal shape and an elliptical shape and the holes 340 having various shapes may be formed on the polarizing plate 340 The polishing by the polishing roll 300 becomes impossible.

As described above, when the polarizer has a step of a certain angle, has a curved surface, or has a hole, the end face of the cut polarizer can not be polished, so that the initial crack propagates inside the polarizer and the polarizer is broken.

In recent years, a display device such as a liquid crystal display device or an organic light emitting display device is not only applied to a TV, a notebook computer, a cellular phone, etc., but is widely applied to a wrist watch or a specific purpose electronic device. But may be formed in various shapes.

However, in the conventional polarizing plate, when the polarizing plate is manufactured into a specific shape, the side surface which is the cut surface can not be polished, cracks are generated by the initial crack, and the produced polarizing plate is damaged. Therefore, a display device having a specific shape can not be manufactured as a conventional polarizer.

The polarizing plate of the present invention can be applied not only to a general display device having a rectangular shape but also to a display device having a specific shape as described above. That is, in the present invention, not only the occurrence of initial cracks but also the occurrence of the initial cracks can be prevented from propagating into the inside of the polarizing plate. Therefore, the polarizing plate of the present invention can be applied to a display device of a specific shape although it can be applied to a display device of general rectangular shape.

11A to 11C are views showing the structure of the polarizing plate 340 according to the present invention.

As shown in FIG. 11A, the polarizing plate 340 of the present invention may have a curved shape. In this case, although the bent portion is formed vertically in the drawing, the bent portion may be formed in various shapes such as an angle of less than 180 degrees, an acute angle, and the like. Also, although the figure shows a polarizer plate in which only one bent area is formed, it may also be applied to the polarizer 340 including a plurality of bent areas having the same angle or different angles.

11B, the polarizing plate 340 of the present invention may have a curved shape or a shape including one or a plurality of holes 342 having various shapes. As shown in FIG. 11C, And one or a plurality of curved concave portions may be formed on one side. Of course, the polarizing plate 340 of the present invention is not limited to the illustrated shapes but may be formed in various shapes.

Meanwhile, the present invention can be applied not only to the polarizer produced by the manufacturing process of FIG. 4 but also to the conventional polarizer. In the case of the conventional polarizing plate, an initial crack occurs on the side surface of the polarizing portion due to the cutting, and when the polarizing plate is polished by the polishing roll shown in Fig. 8A to remove such initial crack, the size of the initial crack can be reduced. The size of the remaining side cross-section crack after polishing depending on the conditions may be about 40 탆 or more.

However, in the case of the PVA film, when the initial crack is 40 탆 or more, it is known that when the PVA film shrinks and expands due to heat or moisture, the initial crack propagates into the PVA film due to stress. Therefore, in the case of the conventional polarizing plate, cracks propagate into the polarizing plate due to initial cracks which remain even after the cracks are removed by polishing, and the polarizing plate becomes defective.

Therefore, in the case of a polarizing plate having an initial crack of 40 m in size by polishing, an adhesive is placed on the side surface of the polarizing portion so that the adhesive is filled in the initial crack, and the initial crack is fixed firmly to the adhesive, .

In other words, the present invention can prevent crack propagation by disposing the adhesive on the side of the polarizing portion of various structures having an initial crack of 40 mu m, preferably an initial crack of 40 mu m - 1.5 mm in size, on the side surface of the polarizing portion .

12A and 12B are diagrams showing the structure of a polarizing plate 310 according to a second embodiment of the present invention.

12A, the polarizing plate 310 of this embodiment includes a polarizing section 312 that transmits only light of a predetermined direction component among light incident on the optical axis in a uniaxial direction, An adhesive 314 applied to the upper and lower surfaces of the polarizing portion 312 and the side surface of the compensating portion 313 and the adhesive 314 applied to the compensating portion 313 by the adhesive 314, And a first protective film 317 and a second protective film 318 attached to the upper surface of the polarizing section 112, respectively. The adhesive is applied between the compensating portion 313 and the polarizing portion 312 to adhere the compensating portion 313 and the polarizing portion 321 firmly. If the compensator 3130 includes one or more sublayers (e.g., an orientation layer, a base film, a QWP, a HWP, a liquid crystal layer), the adhesive is disposed between the sublayers to firmly adhere the layers. ) And the polarizing portion 312 can be achieved by supplying an adhesive therebetween.

The compensation unit 313 may be disposed only on the upper portion of the polarization unit 312 or may be disposed on both the upper and lower portions of the polarization unit 312. [ have. The compensating unit 313 may be disposed on one side or both sides of the upper and lower sides of the polarizing unit 312 according to the type of the display device to which the polarizing plate 310 is applied and the optical characteristic of the compensating unit 313. [ The surface of the compensating section 313 parallel to the first surface or the second surface of the polarizing section 312 is preferably parallel to the surface of the first protective film 317 parallel to the first surface, And is smaller than the area of the surface of the second protective film 318 parallel to the first surface of the polarizing portion 312. The polarizing unit 312 converts natural light into arbitrary polarized light. The polarizing unit 312 may be made of a material containing polyvinyl alcohol (PVA) based resin containing iodine or a dichroic dye as a main component. At this time, the iodine or the dichroic dye is uniaxially stretched to orient iodine or a dichroic dye in one direction.

The polarizing unit 312 may include an O-type polarizer in which a liquid crystal composition containing a dichroic substance and a liquid crystal compound is aligned in a predetermined direction, and an E-type polarizing material in which a lyotropic liquid crystal is aligned in a certain direction Can be used.

The compensation unit 313 changes the polarization direction of the light polarized in the polarization unit 312 or the light incident on the polarization unit 312.

For example, in the case of a liquid crystal display device, the viewing angle characteristics are degraded when the liquid crystal display element is viewed diagonally. This phenomenon occurs because the polarization directions of the two polarizers disposed on the upper and lower portions of the liquid crystal display element are not perpendicular to each other, The light transmitted through the liquid crystal layer is not completely absorbed by the polarizer, and a part of the light is leaked. Therefore, in order to improve the viewing angle characteristics when the liquid crystal display element is viewed diagonally, the polarized light from the lower polarizer must be absorbed by the upper polarizer. In the present invention, the compensation part 313 is provided at the lower part, the upper part, or the upper part of the polarizer 312. The compensation part 313 changes the polarization direction of the light transmitted through the liquid crystal layer of the liquid crystal display device, So that the light is perpendicular to the polarization direction of the upper polarizer, so that no light leaks through the upper polarizer.

Further, in the case of the organic electroluminescent display device, the polarizing plate is disposed at the upper portion to polarize the light input from the outside, thereby reducing the light emitted from the organic light emitting display device. However, since the polarized light is reflected to the outside, visibility is reduced. In the present invention, the compensator 313 changes the polarization direction of the light reflected from the surface of the organic light emitting display device so that the reflected light is perpendicular to the polarization direction of the upper polarizer, so that no light leaks through the upper polarizer, .

The compensation unit 312 may be composed of various compensation materials that can change the polarization direction to improve the viewing angle and compensate for the color change depending on the viewing angle. For example, in the present invention, the compensation unit 312 may be an optical film in the form of a film.

 In this embodiment, the optical film may be a phase retardation film of a quarter wave plate (QWP) that delays a phase of? / 4 and may be a negative and positive A-compensation film, a negative and positive C- And a compensation film such as a positive biaxial compensation film.

As the retardation film, a cyclic olefin polymer (COP) may be used. The COP is a polymer obtained from a cyclic monomer such as norbornene, and is excellent in transparency, heat resistance, chemical resistance, and has a very low birefringence and water absorption. Of course, the compensator 312 of the present invention is not limited to COP, but various retardation films made of cellulose acetate resin can be used. Of course, the retardation film constituting the compensating unit 312 may be composed of various materials, not limited to the COP.

When the polarizing plate 310 having the compensator 312 formed of the retardation film is applied to the organic light emitting display device, the light that is linearly polarized in the first direction by the polarizer 312 is incident on the first compensator 313, And the circularly polarized light is reflected on the surface of the display element and the polarized echoes are reversely converted and then the linearly polarized light (in the direction perpendicular to the polarized light portion 312) is again transformed by the compensating portion 313 do. Since the optical axis direction of the polarization unit 312 and the polarization direction of the input light are perpendicular to each other, input light can be prevented from reflecting light on the surface of the organic light emitting display device by the polarization unit 312.

As the negative and positive A-compensation film, a stretched cycloolefin polymer film or a stretched polycarbonate film can be used, and as the negative and positive C-compensation film, a biaxially stretched polymer film can be used.

The polarizing direction of the light reflected from the surface of the compensating unit 3120 is shifted from the optical axis direction of the polarizing unit 312 to the optical axis direction of the polarizing unit 312 In other words, the compensation unit 314 can prevent the light reflected from the surface of the organic light emitting display device from being reflected by the polarizing unit 312. In this embodiment, (UV) curable liquid crystal material (LC material) used as an RM (Reactive Mesogen) material. The liquid crystal material includes a dopant for determining a twist angle of the cured liquid crystal as a liquid phase, A liquid crystal material is coated on a base film on which an oriented alignment film is formed, and then cured by ultraviolet rays to form a phase retardation layer.

The liquid crystal material is twisted by a dopant, and the retardation of the compensation layer is determined according to the thickness to determine the polarization state of the incident light. In this embodiment, the liquid crystal material may have a thickness of about 1.7-2.3 탆, preferably 2 탆, and may be a compensation layer having a QWP phase delay characteristic for converting polarized light into circularly polarized light.

The liquid crystal material may also be a horizontally oriented negative and positive A-compensation layer, or a vertically oriented negative and positive C-compensation layer.

The adhesive 314 is disposed on the lower surface of the compensator 313 and includes a first region 314a for attaching the first protective film 317 to the lower surface of the compensator 313, A second region 314b which is disposed on the upper surface of the polarizing section 312 and attaches the second protective film 318 to the upper surface of the polarizing section 312, And a third area for sealing the side surface of the compensating part 313 and fixing the first protective film 317 and the second protective film 318 to each other at the periphery of the polarizing part 312 and the compensating part 313 314c. Thus, the adhesive 314 covers one or more edges of the polarizing portion 312 and the compensating portion 313. The adhesive 314 uses a hydrophobic acrylic material, but an acrylic monomer containing a hydrophilic group is used as the adhesive 314 in order to improve adhesion with the polarizer 312 made of hydrophilic PVA.

As described above, in the present invention, since the adhesive 314 is made of a hydrophobic adhesive, moisture penetration through the adhesive 314 can be prevented. If moisture penetrates the polarizing section 312 and the compensating section 313, the polarization function of the polarizing section 312 and the phase retarding function of the compensating section 313 are degraded, The initial cracks formed in the polarization section 312 and / or the compensation section 313 due to expansion and contraction of the polarization section 312 and / or the compensation section 323 are transferred to the inside of the polarization section 312 and / The polarizer 310 becomes defective due to propagation, but in the present invention, the adhesive 314 is made of a substance having a small number of properties, so that moisture penetration through the adhesive 314 can be prevented.

The adhesive 314 fills the initial cracks of the polarizing portion 312 and / or the compensating portion 313 even when an initial crack occurs in the polarizing portion 312 and / or the compensating portion 313, It is possible to prevent the initial crack from growing due to the step of fixing the end of the crack. The adhesive 314 can cover all the edges of the compensating portion 313 or cover the edge where the crack propagates in the stretching direction of the compensating portion 313 as in the case of the polarizing portion 312. [ The adhesive applied between the compensating portions 313a and 313b and the polarizing portion 312 securely attaches the compensating portions 313a and 313b and the polarizing portion 312 to each other.

In the polarizing plate 310 having the structure shown in FIG. 12B, two compensating parts 313a and 313b are disposed below the polarizing part 312. [ In this structure, the compensating units 313a and 313b may be disposed above the polarizing unit 312 according to the type of display device to which the polarizing plate 310 is applied and the optical characteristics of the compensating units 313a and 313b, And may be disposed on the upper and lower portions of the portion 312. The area of the compensating portions 313a and 313b parallel to the first surface of the polarizing portion 312 is larger than the area of the first protective film 317 parallel to the first surface and the area of the second protective film 318 ). At this time, the first compensator 313a is made of a retardation film retarding the phase of? / 4, and the second compensator 313b is made of a retardation film of HWP (Half Wave Plate) When the phase difference film is made of COP, the first compensation part 313a is 32 to 36 mu m and the second compensation part 313b is 31 to 35 mu m, The first compensator 313a may be 34 占 퐉, and the second compensator 313b may be 34 占 퐉.

As described above, the first compensator 313a made of the QWP converts the linearly polarized light into circularly polarized light to prevent reflection of light. However, the compensator 313a made of QWP mainly transmits light of about 550nm band, That is, the green light is smoothly converted into the circularly polarized light, and the light of the other band is not completely circularly polarized. In addition, the first compensator 313a of the QWP can be leaked without being completely blocked in the direction viewed from up and down, right and left in the front view direction of the screen.

On the other hand, the second compensator 313b made of HWP vertically changes the direction of the incident linearly polarized light. Therefore, when the organic light emitting display device is applied to the organic light emitting display device, the first compensating unit 313a and the second compensating unit 313b are provided together to prevent the light of all wavelength ranges from being reflected from the surface of the organic light emitting display device. It is possible to completely block the light in the oblique viewing angle direction.

In addition, the first compensation unit 313a and the second compensation unit 313b may be configured as compensation films. For example, the first compensator 313a may be a compensation film of either a negative or positive A-compensation film, a negative or positive C-film, a negative or positive biaxial compensation film, and the second compensator 313b may also be a negative Or a compensation film of either positive A-compensation film, negative or positive C-film, negative or positive biaxial compensation film. At this time, by adjusting the horizontal direction retardation value or / and the vertical direction retardation value of the compensating film constituting the first compensating section 313a and the second compensating section 313b, light leakage (liquid crystal display element) or light It is possible to completely prevent reflection (organic electroluminescence display element).

The first compensator 313a and the second compensator 313b may be made of a liquid crystal material having a QWP phase delay characteristic and a HWP phase delay characteristic, The portion 313b may be formed to have a thickness of 1.7-2.3 탆, preferably 2 탆 each. The first compensation unit 313a is a QWP compensation layer and the second compensation unit 313b is a HWP compensation layer. The liquid crystal material forming the first compensation part 313a and the second compensation part 313b may each be formed to a thickness of 2 탆 or less.

The first compensation unit 313a may be a phase delay layer and the second compensation unit 313b may be an optical compensation layer. For example, the first compensator 313a may be formed of a liquid crystal material having an inversely-dispersed QWP phase delay characteristic, and the second compensator 313b may include a liquid crystal material having vertically aligned negative and positive C- ≪ / RTI > At this time, the first compensating part 313a and the second compensating part 313b may be formed to have a thickness of 1.7-2.3 탆, preferably 2 탆, respectively.

Of course, the first compensator 313a may be made of a constant dispersion type phase delay material and the second compensator 313b may be made of another compensation material such as an A-compensation material or a B-compensation material.

Also in the polarizing plate 310 of this structure, the adhesive 314 improves the adhesion of the protective films 317 and 318 and prevents the permeation of moisture through the adhesive 314 by using an acrylic monomer containing a hydrophilic group.

FIG. 13 is a view showing a method of manufacturing the polarizing plate 310 according to the second embodiment of the present invention, and FIG. 14 is a view showing an apparatus for manufacturing the polarizing plate 310 according to the second embodiment. Here, the manufacturing method and the manufacturing apparatus of Figs. 13 and 14 relate to a manufacturing method and a manufacturing apparatus when a compensation film (or a retardation film) in the form of a film is used. 12A) or two compensators (the structure of FIG. 12B) in the polarizing plate 310 of the present invention, but in the following description, only one compensator is provided do. Even when the compensation section is made up of two, the compensation section and the process and the apparatus are the same, and only the number of the compensating sections to be laminated or processed will be different.

14, the polarizing plate manufacturing apparatus 400 includes a first supply roll 410 for supplying a guide film 440 with a compensation film 412 attached thereto, and a second supply roll 410 for supplying a stretched PVA film 450 A first coalescing roll 415 joining the PVA film 450 to the laminating guide film 440 and the compensating film 412 and the first coalescing roll 415 joining the PVA film 450 and the compensation film 412 A third supply roll 420 and a fourth supply roll 427 for supplying a first protective film 454 and a second protective film 456 made of an acrylic film, A first guide roll 425 and a second guide roll 428 for guiding the first protective film 454 and the second protective film 456 and the first protective film 454 to the PVA film 450, A third lapping roll 435 for attaching the second protective film 456 to the PVA film 450 and the compensation film 412, A first adhesive supply portion 482 for supplying an adhesive to the second adhesion roll 435 and the third adhesion roll 436, A peeling roll 217 for peeling the guide film 440 and an adhesive applied to the PVA film 450 and the compensation film 412 are cured to form the first protective film 454 and the second protective film 454, 2 curing device 465 for attaching the protective film 456 to the PVA film 450 and the compensation film 412 and the PVA film 450 with the first protective film 454 and the second protective film 456 And a third guide roll 445 for guiding the compensation film 412.

Although not shown in the drawing, the front end of the first supply roll 410 is provided with a cohesive roll for joining the compensation film 412 to the guide film 440.

As shown in FIG. 13, a compensating film is formed on the PVA film in the polarizing plate producing apparatus 400 having the above-described structure (S201). The PVA film and the compensating film are cut to form at least one polarizing portion and a compensating portion (S202). The first protective film is attached to the first surface of the polarizing portion (S203). The surface area of the first protective film parallel to the first surface is larger than the area of the first surface of the polarizing portion. The adhesive is applied to the polarizing portion and the compensating portion to cover at least one edge of the compensating portion and the polarizing portion (S204). The first protective film is attached to the second surface of the compensation part (S205). The surface area of the second protective film parallel to the second surface is larger than the area of the surface of the compensating portion parallel to the first surface. The adhesive is cured so that the protective film is adhered firmly to the polarizing portion (S206).

The lamination of the compensation film 412 and the guide film 440 and the guide film 440 including the PVA film 450 and the compensation film 412 may be provided with separate adhesive means, The compensating film 412 and the guide film 440 and the PVD film 450 and the guide film 440 may be laminated by a van der Waals force.

In the above description, the compensation film 412 is laminated on the guide film 440 and then the PVA film 450 is laminated. However, after the compensation film 412 and the PVA film 450 are laminated, The film 412 and the PVA film 450 may be joined to the guide film 440.

Thereafter, the PVA film 450 and the compensation film 412, which are joined to the guide film 240, are processed by using a processing device 460 such as a laser. Since the processing device 460 processes only the PVA film 450 and the compensation film 412 and does not process the guide film 440, the plurality of processed PVA films 250 and the compensation Only the film 412 is present. Although a mechanical cutting tool can be used as the processing device 460, it may be preferable to use a laser in that it does not give mechanical shock to the PVA film 250. The processing of the PVA film 450 and the compensation film 412 depends on the shape of the display device to which the polarizing plate is applied. For example, when the display device is a square or a rectangular shape, the polarizing plate included in the display device is also formed in a square shape or a rectangular shape, so that the PVA film 450 and the compensation film 412 are also formed in a square shape or a rectangular shape. In addition, when the display device has a specific shape such as a polygonal shape, a circular shape, or an elliptical shape with a plurality of bent portions, the processed PVA film 450 and the compensation film 412 may be formed into a polygonal shape having a bent portion, And the like.

Of course, since the adhesive is disposed on the side surface of the polarizing portion, the PVA film 450 and the compensation film 412 are processed to have an area smaller than that of the polarizing plate to be produced. After the first protective film 454 and the second protective film 456 are supplied using the third supply roll 420 and the fourth supply roll 427, the second lapping roll 435 and third The first protective film 454 and the second protective film 456 supplied by the adhesion rolls 436 are attached to the upper and lower surfaces of the PVA film 450 and the compensation film 412, respectively. A first adhesive 1 supply part 482 and a second adhesive supply part 484 are provided near the second adhesion roll 435 and the third adhesion roll 436 to apply an adhesive to the upper and lower surfaces of the PVA film 450 The first protective film 454 and the second protective film 456 are attached to the upper and lower surfaces of the PVA film 450 and the compensation film 412, respectively. For example, the adhesive may be applied to the upper surface of the PVA film by the first adhesive supply portion 482 and may be applied to the lower surface of the compensation film by the second adhesive supply portion 484.

The peeling roll 417 is used to peel the guide film 440 from the PVA film 450 and the compensation film 412 between the application of the adhesive on the upper surface of the PVA film and the application of the adhesive on the lower surface of the compensation film 412. For example, after the protective film 454 is attached to the top surface of the PVA film 450 and the compensation film 412, the guide film 440 may be peeled from the PVA film 450 and the compensation film 412 .

The PVA film 450 and the compensation film 412 are a plurality of separate films and the first protective film 454 and the second protective film 456 are bonded to the second adhering roll 435 and the third adhering roll 436 The first protective film 454 and the second protective film 456 are attached to the upper and lower surfaces of the PVA film 450 and the compensation film 412 as well as the first protective film 454 and the second protective film 456. [ And the second protective film 456 are attached to each other. At this time, an adhesive covers one or more edges of the PVA film 450 and the compensation film 412.

Thereafter, the adhesive between the PVA film 450 and the compensation film 412 and the first protective film 454 and the second protective film 456 is cured by using the curing device 465, The PVA film 450 and the compensation film 412, the first protective film 454 and the second protective film 456 are cut to complete a plurality of polarizing plates. The cuts of the PVA film 450 and the compensation film 412 and the first protective film 454 and the second protective film 456 are cut along the shapes of the PVA film 450 and the compensation film 412, (For example, 1 to 1.5 mm) from the sides of the PVA film 450 and the compensation film 412. [

FIG. 15 is a view showing another manufacturing method of the polarizing plate 310 according to the second embodiment of the present invention. FIG. 16 is a view showing another manufacturing apparatus of the polarizing plate 310 according to the second embodiment of the present invention, A method of manufacturing and a manufacturing apparatus when a material is used as a compensation layer.

16, the polarizer manufacturing apparatus 500 includes a first supply roll 510 and a second supply roll 511 for supplying a guide film 540 having an orientation film formed thereon, A first curing device 543 for curing the liquid crystal material applied to the guide film 540 and a second curing device 543 for curing the liquid crystal material applied to the guide film 540, A first coalescing roll 515 for joining the formed guide film 540 and the PVA film 550 to transfer the liquid crystal layer to the PVA film 550 and a processing device for processing the PVA film 550 onto which the liquid crystal layer is transferred A third supply roll 520 and a fourth supply roll 527 for supplying a first protective film 554 and a second protective film 556 made of an acrylic film, A first guide roll 525 and a second guide roll 528 for guiding the first protective film 554 and the second protective film 556 to the PVA film 550, A cementing roll 535, A third adhering roll 536 for adhering the second protective film 556 to the PVA film 550 and a second adhesive roll 536 for adhering the second adhering roll 535 and the third adhering roll 536 to the PVA film 550, A peeling roll 517 for peeling the guide film 540 from the PVA film 550 and an adhesive agent applied to the PVA film 450 to cure the adhesive agent 582 and the second adhesive agent supply part 584, A second curing device 565 for attaching the first protective film 554 and the second protective film 556 to the PVA film 550 and a second curing device 565 for attaching the first protective film 554 and the second protective film 556 to the PVA film 550, And a third guide roll 545 for guiding the PVA film 550.

Although not shown in the drawing, the front end of the second supply roll 511 is provided with an orientation film forming device and a curing device for forming an orientation film on the guide film 5400, an orientation direction forming device such as a rubbing device for determining the orientation direction in the cured orientation film Can be installed.

As the first curing device for curing the liquid crystal material and the second curing device for curing the adhesive, an ultraviolet curing device is used. At this time, the wavelength of ultraviolet light emitted from the first curing device and the wavelength of ultraviolet light emitted from the second curing device The wavelengths are set differently.

As shown in FIG. 15, after the liquid crystal is applied to the PVA film 250 (S301), the liquid crystal is cured to form a compensation film (S302). The PVA film 250 and the compensation film are cut to form at least one polarizing portion and a compensating portion (S303). The first compensation film is attached to the first surface of the polarizing portion (S304), wherein the area of the surface of the first protective film parallel to the first surface is larger than the area of the first surface of the polarizing portion. An adhesive is applied to the polarizing portion and the compensating portion to cover at least one edge of the compensating portion and the compensating portion (S305). The second protective film is attached to the second surface of the compensator (S306), wherein the area of the surface of the second protective film parallel to the second surface is larger than the area of the surface of the compensator parallel to the first surface. The adhesive is cured and the compensation film is adhered firmly to the polarizing portion (S307).

At this time, the liquid crystal layer may be composed of one layer having a phase retardation characteristic of QWP, and may be formed of a plurality of layers or QWPs having a phase delay characteristic and a positive C- . The ultraviolet (UV) of the first curing device 543 is an ultraviolet ray having a wavelength of about 365 nm.

Although not shown in the figure, the guide film 540 is provided with an orientation film whose orientation direction is determined in a specific direction. When the liquid crystal material is applied to the guide film 540, the liquid crystal molecules of the liquid crystal material are arranged along the alignment direction of the alignment film to determine the optical characteristics of the liquid crystal layer.

After the PVA film 550 is stretched, the stretched PVA film 550 is joined to the guide film 540 having the liquid crystal layer formed thereon. The guide film 540 is transferred to the PVA film 550 by this lamination. Then, the PVA film 550 bonded to the guide film 540 is processed by using a processing device 560 such as a laser. Only the liquid crystal layer transferred to the PVA film 550 and the PVA film 550 is processed and the guide film 540 is not processed so that the PVA film 550 and at least one liquid crystal layer .

The processing of the PVA film 550 and the liquid crystal layer depends on the shape of the display device to which the polarizing plate is applied. For example, when the display device is a square or rectangular shape, the polarizing plate included in the display device is also formed in a square shape or a rectangular shape, so that the PVA film 550 and the liquid crystal layer are also formed in a square shape or a rectangular shape. Further, when the display device has a specific shape such as a polygonal shape with a bent portion, a circular shape, or an elliptical shape, the PVA film 550 to be processed and the corresponding shape such as a polygonal shape having a bent portion, Lt; / RTI >

Of course, since the adhesive is disposed on at least one edge of the polarizing portion and the compensating portion, the PVA film 550 and the liquid crystal layer are processed to have an area smaller than that of the polarizing plate to be produced.

Next, the first protective film 554 and the second protective film 556 are attached to the upper and lower surfaces of the PVA film 550 and the liquid crystal layer, respectively, and the guide film is peeled off. For example, the adhesive is applied to the first adhesive supply device 582 ) And can be applied to the lower surface of the liquid crystal layer by the second adhesive supply device 584. [ The first protective film 554 may be peeled from the PVA film 55 and the liquid crystal layer after the guide film 540 is adhered to the upper surface of the PVA film 55 and the liquid crystal layer.

Subsequently, ultraviolet light is irradiated by the second curing device 565 to cure the adhesive between the first protective film 554 and the second protective film 556 and the adhesive between the PVA film 550 and the liquid crystal layer, do. The first and second protective films 554 and 556 are cut so as to extend a predetermined distance from the boundary between the PVA film 550 and the liquid crystal layer in which the boundaries of the first and second protective films 554 and 556 are cut and a plurality of polarizing plates are completed (S308). The adhesive is cured by irradiating ultraviolet rays having a wavelength of about 313 nm. At this time, since the wavelength (about 313 nm) of the ultraviolet ray for adhesive curing and the ultraviolet ray wavelength (about 365 nm) for curing the liquid crystal material are different, the liquid crystal material already cured by the ultraviolet ray, Can be prevented from being changed.

17A to 17C are views showing the structure of a display device having a polarizing plate according to the present invention.

17A, the display device according to the present invention includes a display panel 600 and a first polarizer 610 and a second polarizer 640 attached to the upper and lower surfaces of the display panel 600, respectively .

The display panel 600 is a liquid crystal panel. Although not shown in the figure, the liquid crystal panel 600 includes a first substrate and a second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate and the second substrate are made of a material such as glass or plastic that is transparent and flat and has a smooth upper and lower surfaces. A plurality of gate lines and data lines are formed on the first substrate to define a plurality of pixel regions, the thin film transistors being switching elements are formed in each pixel region and the pixel electrodes formed on the pixel regions are formed do. The thin film transistor includes a gate electrode connected to a gate line, a semiconductor layer formed by stacking amorphous silicon or the like on the gate electrode, and a source electrode and a drain electrode formed on the semiconductor layer and connected to the data line and the pixel electrode .

The second substrate is divided into a color filter composed of a plurality of sub-color filters implementing the colors of red (R), green (G) and blue (B) And a black matrix for blocking light transmitted through the layer.

The first substrate and the second substrate having the liquid crystal layer interposed therebetween are bonded together by a sealant formed on the outer side so as to face each other to constitute a liquid crystal panel, And a cusped key formed on the first substrate or the second substrate.

The first polarizing plate 610 includes a first polarizing portion 612 that transmits only light of a predetermined direction component in the incident light having an optical axis formed in the uniaxial direction and a first polarizing portion 612 The first protective film 617 and the second protective film 618 are attached to the lower surface and the upper surface, respectively.

The first adhesive 614 includes a first region 614a and a second region 614b disposed on the lower surface and the upper surface of the polarizing section 612 and a second region 614b disposed on the side surface of the polarizing section 612, And a third region 614c that seals the side end surface of the first protection film 517 and the second protection film 518 to each other.

The second polarizing section 640 includes a second polarizing section 642 and a third protective film 647 attached to the lower and upper surfaces of the second polarizing section 642 by the second adhesive 644, And a fourth protective film 648.

The second adhesive 644 includes a first region 644a and a second region 644b disposed on the lower surface and the upper surface of the polarizing section 642 and a second region 644b disposed on the side surface of the polarizing section 642, And a third region 614c sealing the side surface of the portion 642 and attaching the third protective film 647 and the fourth protective film 648 to each other.

The first polarizing portion 612 and the second polarizing portion 642 are films that can convert natural light into arbitrary polarized light and include a polyvinyl alcohol (PVA) based resin containing iodine or a dichroic dye as a main component It is preferable to use an O-type polarizer in which a liquid crystal composition containing a dichroic substance and a liquid crystal compound is aligned in a certain direction, or an E-polarizer in which a lyotropic liquid crystal is aligned in a certain direction Etc. may be used.

The first to fourth protective films 617, 618, 647 and 648 may be made of triacetyl cellulose (TAC), polyethylene terephthalate (PET), cycloolefin polymer (COP) In order to prevent moisture penetration, it is preferable to be formed of an acrylic material having a hydrophobic property.

The first adhesive 614 and the second adhesive 644 may be made of an acrylic monomer having a hydrophobic property, a radical polymerization initiator, an epoxy resin, an iodine initiator as a cationic photopolymerization initiator, It is preferable to use an adhesive material. It may have at least one hydrophilic group to improve adhesion with PVA.

The first adhesive 614 and the second adhesive 644 may be composed of one adhesive layer and two adhesive layers as shown in FIGS. 2A and 2B, respectively. 3, the first adhesive 614 and the second adhesive 644 are each composed of an adhesive layer on the upper surface of the polarizer, an adhesive layer on the lower surface, and an adhesive layer on the side surface, .

In the display device of this structure, a first polarizing plate 610 and a second polarizing plate 640 are respectively attached to the upper and lower surfaces of the liquid crystal panel 600, and the first polarizing plate 610 and the second polarizing plate 640 The shafts are perpendicular to each other or horizontally formed to realize an image by controlling the transmittance of light inputted to and outputted from the external backlight to the liquid crystal panel 600.

The first polarizing plate 612 and the second polarizing plate 642 of the first polarizing plate 610 and the second polarizing plate 640 are not exposed to the outside and the first adhesive 614 is not exposed to the outside, The third region 614c of the second adhesive 644 and the third region 644c of the second adhesive 644 can prevent external moisture from penetrating into the polarizers 610 and 640, It is possible to prevent an initial crack from occurring or propagation of an initial crack.

Therefore, breakage of the polarizing plates 610 and 640 due to moisture penetration and cracking can be prevented. In addition, since the polishing process for removing the initial cracks is not required, the manufacturing process can be shortened and the manufacturing cost can be reduced, and various types of polarizing plates that can not be polished by the polishing roll can be manufactured.

17B, the display device according to the present invention may include a display panel 700 and a polarizing plate 710 attached to the upper surface of the display panel 700, respectively.

The display panel 700 is an organic light emitting display panel. Although not shown in the drawing, the organic light emitting display panel 700 includes a first substrate and a second substrate, and an organic light emitting layer disposed between the first substrate and the second substrate. The first substrate and the second substrate are made of a material such as glass or plastic that is transparent and flat and has a smooth upper and lower surfaces. A plurality of gate lines and data lines are formed on the first substrate to define a plurality of pixel regions, the thin film transistors being switching elements are formed in each pixel region and the pixel electrodes formed on the pixel regions are formed do. The thin film transistor includes a gate electrode connected to a gate line, a semiconductor layer formed by stacking amorphous silicon or the like on the gate electrode, and a source electrode and a drain electrode formed on the semiconductor layer and connected to the data line and the pixel electrode .

The first substrate and the second substrate having the above structure are provided with an organic light emitting layer therebetween, and light is emitted from the organic light emitting layer as a signal is applied, thereby realizing an image.

The polarizing plate 710 is attached to the lower surface and the upper surface of the polarizing portion 712 by a polarizing portion 712 and an adhesive 714 that transmit only light of a predetermined direction component in an incident optical axis in the uniaxial direction, And a first protective film 717 and a second protective film 718.

The adhesive 714 has a first region 714a and a second region 714b disposed on a lower surface and an upper surface of the polarizing section 712 and a second polarizing section 712a disposed on the side surface of the polarizing section 712, And a third region 714c that seals one or more edges of the first protective film 717 and the second protective film 718 and fixes them together.

The polarizing portion 712 uses a polymer film containing a polyvinyl alcohol (PVA) based resin as a main component. The protective film 17, 718 uses an acrylic material having a hydrophobic property, and the adhesive 714 is an acrylic Materials are used.

In the display device of this structure, the polarizing plate 710 is attached to the upper surface of the organic light emitting display panel 700 so that the light emitted from the organic light emitting layer is transmitted and the light incident from the outside is blocked, Thereby improving the visibility of the display device.

At this time, since the polarizer 712 is sealed by the adhesive, external moisture can be prevented from penetrating into the polarizer 710, and an initial crack can be generated in the polarizer 712 or an initial crack can be prevented . Accordingly, breakage of the polarizing plate 710 due to moisture penetration and cracking can be prevented. In addition, since the polishing process for removing the initial cracks is not required, the manufacturing process can be shortened and the manufacturing cost can be reduced, and various types of polarizing plates that can not be polished by the polishing roll can be manufactured.

As shown in FIG. 17C, the display device according to the present invention may include a display panel 800 and a polarizing plate 810 attached to the upper surface of the display panel 800, respectively. The display panel 800 is an organic light emitting display panel and has the same structure as the display panel 700 shown in FIG. 17B.

The polarizing plate 810 includes a polarizing section 812 for transmitting only a light having a predetermined direction component in the incident light having an optical axis formed in the uniaxial direction, a compensating section 813 disposed below the polarizing section 812, The first protective film 817 and the second protective film 818 attached to the lower surface of the compensating section 813 and the upper surface of the polarizing section 812 by an adhesive 814. [

The compensation unit 813 may be composed of a single film or a plurality of films and may be composed of a single layer or a plurality of layers. 12A and 12B, the compensation unit 813 may be a phase difference film or a compensation film having a QWP phase delay characteristic or a plurality of phase difference films having a QWP phase delay characteristic and a HWP phase delay characteristic, Lt; / RTI > The compensation unit 713 may be a liquid crystal layer having a QWP phase delay characteristic or a plurality of liquid crystal layers having a QWP phase delay characteristic and a HWP phase delay characteristic and may be a liquid crystal layer having a QWP phase delay characteristic, Or a compensation layer such as a C-compensation layer.

The adhesive 814 has a first region 814a and a second region 814b disposed on the lower surface of the compensating section 813 and on the upper surface of the polarizing section 812 and a second region 814b disposed between the polarizing section 812 and the compensating section 813 A third region 814c which is disposed on the side end face and at least one of the polarizing portion 812 and the compensating portion 813 seals the edge and attaches the first protective film 817 and the second protective film 818 to each other .

The polarizing portion 812 uses a polymer film containing a polyvinyl alcohol (PVA) based resin as a main component. The protective films 817 and 818 use an acrylic material having a hydrophobic property. The adhesive 814 is an acrylic Materials are used.

In the display device of this structure, the polarizing plate 810 is attached to the upper surface of the organic light emitting display panel 800, and the light emitted from the organic light emitting layer is transmitted through the organic light emitting layer, Thereby improving the visibility of the display device.

Since the polarizer 812 and the compensator 813 are sealed by the adhesive agent, the moisture outside the polarizer 810 can be prevented from penetrating into the polarizer 810 and the polarizer 812 and the compensator 813, It is possible to prevent an initial crack from occurring or propagation of an initial crack. Accordingly, breakage of the polarizing plate 810 due to moisture penetration and cracking can be prevented. In addition, since the polishing process for removing the initial cracks is not required, the manufacturing process can be shortened and the manufacturing cost can be reduced, and various types of polarizing plates that can not be polished by the polishing roll can be manufactured.

As described above, in the present invention, an adhesive is provided on at least one side end face of the polarizing portion of the polarizing plate to prevent a crack generated on the side end face of the polarizing portion from propagating due to the adhesive force of the adhesive.

Although the polarizer is described as an example in the above description, the present invention can be applied not only to the polarizer including the polarizer and the compensator but also to other films. For example, when a protective film is adhered to various functional layers for an optical compensating layer or a stereoscopic image by an adhesive for optical compensation or the implementation of a stereoscopic image, an adhesive is disposed on the side surface of the optical compensation layer or the functional layer, It is possible to prevent cracks generated in these layers from propagating to the inside.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: Polarizer 112: Polarizer
114, 115, 116: adhesive 117, 118: protective film
500, 600, 700: Display panel

Claims (24)

A polarizing portion;
A first protective film attached to a first surface of the polarizing portion and having an area of a surface parallel to the first surface larger than an area of a first surface of the polarizing portion;
A second protective film attached to a second surface of the polarizing portion and having an area of a surface parallel to the first surface being larger than an area of a second surface of the polarizing portion; And
And an adhesive disposed between the first protective film and the second protective film. The polarizing plate according to claim 1, wherein the adhesive comprises a hydrophobic substance comprising at least one acrylic monomer having a hydrophilic group. The polarizer according to claim 1, wherein the adhesive covers the entire edge of the polarizing portion. The polarizer of claim 1, wherein the thickness of the adhesive at the edges of the at least one polarizing portion is 1-10 占 퐉 and the width of the adhesive covering at least one edge of the polarizing portion is 1 占 퐉 -1.5 mm. The polarizing plate according to claim 1, wherein at least one edge of the polarizing portion covered by the adhesive is cracked. The polarizing plate according to claim 5, wherein a size of the crack is 40 m or more. 6. The polarizing plate according to claim 5, wherein the adhesive covers an edge of a cracked polarized portion propagating along a stretching direction. The polarizing plate according to claim 5, wherein the edge of at least one polarizing portion in which at least one crack is formed includes an edge disposed along the stretching direction of the polarizing portion and an edge extending in the direction perpendicular to the stretching direction of the polarizing portion. The polarizing plate according to claim 1, further comprising a compensation unit for converting a polarization state of light input and output to a polarization state different from the polarization state of the input light. The polarizer according to claim 9, wherein the compensation unit has one or two of quarter wave plate (QWP) and half-wave retardation plate (HWP) phase retardation characteristics. The polarizing plate according to claim 9, wherein the adhesive is cured by a first ultraviolet ray and the compensator is cured by a second ultraviolet ray having a wavelength range different from that of the first ultraviolet ray. The polarizing plate according to claim 9, wherein the polarizing portion includes an alignment layer and a liquid crystal layer disposed on the alignment layer, and the lower face of the alignment layer is in contact with the adhesive. The polarizing plate according to claim 9, wherein the area of the surface of the first protective film and the area of the surface of the second protective film are larger than the area of the surface of the compensation part parallel to the first surface, and the adhesive covers at least one edge of the compensation part. The polarizing plate according to claim 1, wherein the polarizing portion includes a concave shape, a curved shape, a polygonal shape, and a hole shape. Wherein the polarizer comprises a polarizer,
A polarizing portion;
A first protective film attached to a first surface of the polarizing portion and having an area of a surface parallel to the first surface larger than an area of a first surface of the polarizing portion;
A second protective film attached to a second surface of the polarizing portion and having an area of a surface parallel to the first surface being larger than an area of a second surface of the polarizing portion; And
And an adhesive disposed between the first protective film and the second protective film. Cutting the polarizing film to form a polarizing portion;
Attaching a first protective film having a surface parallel to the first surface of the polarizing portion to the first surface of the polarizing portion, the first protective film being larger than the first surface of the polarizing portion;
Applying an adhesive over the polarizing portion to cover at least one edge of the polarizing portion;
Attaching a second protective film having a surface parallel to the second surface of the polarizing portion to the second surface of the polarizing portion, the second protective film being larger than the second surface of the polarizing portion; And
And curing the adhesive. 17. The polarizing plate manufacturing method according to claim 16, wherein the polarizing film is cut while attached to the base film. The polarizing plate manufacturing method according to claim 17, further comprising the step of attaching the first protective film to the first surface of the polarizing portion and then peeling off the base film. 17. The method of claim 16, wherein one or more cracks are formed in at least one edge of the polarizing portion and the adhesive includes an adhesive in the edge of the polarizing portion. 17. The method of claim 16, wherein curing the adhesive comprises irradiating the adhesive with a first ultraviolet ray. The method of claim 16, further comprising cutting the first protective film and the second protective film such that a boundary between the first protective film and the second protective film is spaced apart from a boundary of the polarizing section. 17. The method of claim 16,
Forming at least one compensation film on the polarizing film; And
Further comprising the step of cutting the polarizing film to form a polarizing portion. The polarizing plate manufacturing method according to claim 22, wherein the cutting of the compensation film is performed simultaneously with the cutting of the polarizing portion. 23. The method of claim 22, wherein the curing of the adhesive comprises irradiating the adhesive with a first ultraviolet ray and the at least one compensation film comprises an ultraviolet ray curable liquid crystal,
Wherein forming the compensation film comprises:
Applying an ultraviolet curable liquid crystal onto the polarizing portion; And
Irradiating a second ultraviolet ray having a wavelength range different from that of the first ultraviolet ray to cure the ultraviolet ray hardening liquid crystal.

Images