KR101668354B1 - Display device - Google Patents

Abstract

The present invention relates to a display panel, And a polarizing plate disposed on the display panel and including a polarizer and a high hardness plastic film.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device including a polarizing plate including a high hardness plastic film so as to replace a cover plate.

In the case of a thin display device such as a liquid crystal display device or an organic electroluminescent device, a cover plate made of glass or tempered glass is mounted on the surface thereof to protect the display from external impact or scratches. In addition, recently, devices including a touch function such as a smart phone or a tablet PC have been rapidly developed, and standards for durability and wear resistance required for a display device are increasing.

However, the conventional cover plate made of glass has a problem in that it is not suitable for a thin and lightweight trend due to its weight and thickness, and is easily broken by an external impact.

Accordingly, a method of replacing the cover plate by using a plastic resin which is easy to lighten and does not break is being studied. However, in order to improve the hardness of the plastic film to a level that can substitute for the glass, the thickness of the resin layer should be more than a certain thickness, for example, 50 탆, 70 탆, or 100 탆. In the case of the plastic resin layer, There is a problem that a curling or warping phenomenon due to hardening shrinkage is likely to occur and a crack (crack) is generated as the resin layer is hardened.

Therefore, in a large-sized display device, it is required to develop a technology which is excellent in durability and abrasion resistance so as to realize a touch function, and can make the device lighter and thinner.

The present invention provides a polarizing plate and a polarizing plate in which a high hardness plastic film is integrated to provide a display device that is excellent in surface hardness, impact resistance, durability, and abrasion resistance while being lighter and thinner.

In one aspect, the present invention provides a display panel comprising: a display panel; And a polarizing plate disposed on the display panel and having a polarizer and a high hardness plastic film integrated with each other.

When the polarizing plate of the present invention including the high hardness plastic film is used, it is possible to secure scratch resistance, impact resistance, hardness, and high durability without applying a separate cover plate made of glass or tempered glass, It is possible to prevent the risk of breakage which may occur in using glass or tempered glass cover plate.

In addition, in the case of the display device using the integrated polarizing plate as described above, it is possible to realize a thin and light device with high transmissivity and visibility by minimizing the number of films or layers included in the device.

Further, in the case of the present invention, since the integrated polarizing plate is used, the device assembling process can be simplified, and the cost can be reduced, and the defect rate of the finished product can be reduced.

1 is a cross-sectional view illustrating a polarizer according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a polarizer according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a polarizer according to an embodiment of the present invention.
4 is a cross-sectional view illustrating high hardness plastic films according to various embodiments of the present invention.
5 is a cross-sectional view illustrating a display device according to an embodiment of the present invention.
6 is a cross-sectional view illustrating a display device according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
8 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
9 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
10 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
11 is a cross-sectional view illustrating a polarizer used in a conventional display device and a polarizer used in a display device according to an embodiment of the present invention.

First, terms of the present invention will be described.

The term " upper surface " in the present invention means a surface disposed facing the viewer when the polarizing plate is mounted on the device. And " upper " means a direction toward the viewer when the polarizing plate is mounted on the device. The term " uppermost " means a portion closest to the viewer from the direction toward the viewer when the polarizing plate is mounted on the device, and the specific layer or film is located at the " Means that there are no more layers, films, or devices between the viewers. In contrast, 'bottom' or 'bottom' refers to a plane or direction that is oriented toward the opposite side of the viewer when the polarizer is mounted on the device.

In the present invention, "integrated" or "integrated" means that a plurality of devices, layers, or films are laminated on an adhesive layer or without a separate adhesive layer to form a single body as a module, Means that the process is applied.

In the present invention, n _x means the refractive index in the direction of the slow axis in the plane direction of the film or plate, and n _y means the refractive index in the direction perpendicular to the slow axis in the plane direction of the film or plate. Also, n _z means the refractive index in the thickness direction of the film or plate.

In the present invention, the term 'A film' refers to a film having a refractive index satisfying nx ≠ ny = nz, where nx> ny denotes a + A film, nx <ny denotes a film, A film.

In the present invention, the term 'C film' refers to a film having a refractive index satisfying nx = ny ≠ nz, where ny <nz is a + C film and ny> nz is a -C film Quot;

In the present invention, the term 'B film' refers to a film having a refractive index satisfying nx ≠ ny ≠ nz. When nx> ny> nz is -B film and nz> nx> B film.

In the present specification, the term retardation value Rin refers to a value expressed by the following formula (1), and the term retardation value in thickness direction (Rth) refers to a value represented by the following formula (2) .

(1): R _in = dx (nx - ny)

(2): R _th = dx (nz - ny)

In the above formulas (1) and (2), nx, ny and nz are the same as defined above, and d means the thickness of the film or plate on which the retardation value is measured.

Hereinafter, the present invention will be described more specifically with reference to the drawings. It is to be understood, however, that the following drawings are for the purpose of promoting understanding of the present invention only and are not limitative of the scope of the present invention. In the following drawings, the same reference numerals are used for the same elements, and some elements may be exaggerated, reduced or omitted for better understanding of the invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

First, the polarizing plate of the present invention will be described.

Figs. 1 to 3 show implementations of the polarizer used in the display device of the present invention.

1 to 3, a polarizing plate 100 used in a display device of the present invention includes a polarizer 130, an adhesive layer 120, and a hardness plastic film 110.

More specifically, the polarizer 130 and the high hardness plastic film 110 located on the upper surface of the polarizer 130 are integrated by the first adhesive layer 120 to constitute the polarizer 100.

Here, the polarizer 130 is an optical element that transmits linearly polarized light in a specific direction. Polarizers well known in the art can be used without limitation. For example, when an iodine compound or a dichroic polarizing material is a constant (Hereinafter, referred to as PVA) -based film oriented in a direction parallel to the substrate surface. Such a polarizer can be produced by dying iodine or a dichroic dye to a polyvinyl alcohol-based film, stretching it in a certain direction and crosslinking it. The degree of polymerization of the polyvinyl alcohol is not particularly limited, but it is preferably 1,000 to 10,000, more preferably 1,500 to 5,000, in consideration of the freedom of molecular motion and the smooth mixing with the contained material .

Next, the first adhesive layer 120 is formed on the upper surface of the polarizer 130 for coupling the polarizer 130 and the hard plastic film 110 together. The first adhesive layer 120 may be formed using an adhesive for a polarizing plate that is generally manufactured and circulated in the art, and the kind thereof is not particularly limited. For example, the first adhesive layer 120 may be formed of an acrylic adhesive, a dry laminate adhesive obtained by mixing a urethane resin solution and a polyisocyanate resin solution, a styrene butadiene rubber adhesive, an epoxy adhesive, a polyvinyl alcohol adhesive, a urethane adhesive, Based adhesive such as an adhesive containing a polyester-based ionomer-type urethane resin and a compound having a glycidyloxy group, or may be formed of a cationic adhesive containing a cation-curable monomer and a cationic initiator, a radical-curable monomer And a radical-based adhesive comprising a radical initiator. As the cationically curable monomer, an epoxy-based monomer having at least two epoxy groups in the molecule or an oxetane compound having at least one oxetanyl group in the molecule may be used alone or in combination, no. The radical-curable monomer may be an acrylic monomer having an unsaturated double bond, but is not limited thereto. The first adhesive layer 120 is more preferably formed of a photo-curing adhesive in consideration of the convenience of the manufacturing process and the adhesive force with the hardened plastic film.

The high hardness plastic film 110 is for imparting high hardness properties to the polarizing plate of the present invention and is attached on the first adhesive layer 120 to form a polarizing plate integrated with the polarizer 130 , And may be located at the top of the display device.

The high hardness plastic film may preferably include at least one coating layer having an elastic modulus of at least 2000 MPa as measured by ASTM D882.

In the present invention, the composition and components of the high hardness plastic film 110 are not necessarily limited to those described below, provided that the high hardness plastic film comprises a coating layer satisfying the modulus of elasticity of not less than 2000 MPa In this case, it is preferable that the above-mentioned coating layer is located on the upper surface of the high hardness plastic film.

As the modulus of elasticity of the coating layer included in the high hardness plastic film has a large elastic modulus of 2000 MPa, high physical strength such as hardness, durability and scratch resistance can be exhibited.

According to one embodiment of the present invention, the high hardness plastic film 110 may be a substrate-free monolayer film, as shown in FIG. When the high hardness plastic film 110 is a single layer film, the modulus of elasticity of the single layer film may be more than 2000 MPa. The monolayer film may have a thickness of 40 mu m or more, preferably about 40 mu m to about 500 mu m, or about 40 mu m to about 300 mu m.

In the substrate-less, the substrate is a supporting means for applying a coating composition for forming a coating layer, and a supporting substrate which remains in a state of not peeling even after curing of the coating composition ), And therefore, the article-free article does not include such a supporting substrate. Although the high hardness plastic film according to an embodiment of the present invention does not include a supporting substrate, it has excellent curl characteristics without warping or cracking, high thickness and flatness, high hardness, impact resistance, scratch resistance, high transmittance Lt; / RTI &gt;

Alternatively, according to another embodiment of the present invention, the high hardness plastic film 110 may be a structure including two layers each formed on the upper surface and the lower surface of the substrate and the substrate, respectively. When the high hardness plastic film has such a multilayer structure, the coating layer located on the upper surface preferably has a modulus of elasticity of at least 2000 MPa in terms of physical strength such as hardness, durability and scratch resistance.

1, the high hardness plastic film 110 is formed on the lower surface of the supporting substrate 112 and the supporting substrate 112 and includes a first coating layer 116 having a first elastic modulus, And a second coating layer 114 formed on the upper surface of the supporting substrate 112 and having a second elastic modulus.

As shown in Fig. 1, when the high hardness plastic film has two coating layers having elastic modulus different from each other on both surfaces, the modulus of elasticity of the coating layer formed on the upper surface of the supporting substrate, that is, The second elastic modulus of the first coating layer 114 may be about 2000 MPa or more, and the elastic modulus of the coating layer formed on the lower surface of the supporting substrate, that is, the first elastic modulus of the first coating layer 116 may be about 1500 MPa or less. That is, the elastic modulus of the second coating layer formed on the upper surface may be greater than the elastic modulus of the first coating layer formed on the lower surface by about 500 MPa or more.

Thus, the second coating layer having a larger elastic modulus can exhibit high physical strength such as hardness and scratch resistance, and the first coating layer of the lower surface having a relatively low elastic modulus can exhibit impact resistance and flexural resistance And the high hardness plastic film including the first and second coating layers can exhibit physical properties in which hardness and impact resistance are harmonized.

Therefore, a polarizing plate in which a high hardness plastic film including a coating layer having an elastic modulus of at least 2000 MPa on the upper surface and having a different elastic modulus on both sides of the substrate, as described above, is integrally formed with the polarizer, But also has excellent curvature and cracking problem and can exhibit excellent processability.

According to an embodiment of the present invention, the first elastic modulus may be about 1500 MPa or less, for example about 300 to about 1500 MPa, or about 300 to about 1200 MPa, or about 300 to about 100 MPa, The modulus can be greater than or equal to about 2000 MPa, such as from about 2000 to about 3500 MPa, or from about 2000 to about 3000 MPa, or from about 2000 to about 2800 MPa.

The support base material 112 is for supporting the first coating layer 116 and the second coating layer 114 and is a transparent plastic resin that is usually used and is particularly useful for a manufacturing method and material for a supporting substrate such as a stretched film or a non- Can be used without restrictions. More specifically, as the supporting substrate, a polyester such as polyethyleneterephtalate (PET), a polyethylene such as ethylene vinyl acetate (EVA), a cyclic olefin polymer (COP), a cyclic olefin copolymer (COC), a polyacrylate (PAC), a polycarbonate (PC), a polyethylene (PE), a polymethylmethacrylate ), Polyetheretherketone (PEEK), polyethylenenaphthalate (PEN), polyetherimide (PEI), polyimide (PI), triacetylcellulose (TAC) methacrylate, or a fluorine-based resin. The supporting substrate may be a single layer or a multi-layer structure including two or more substrates made of the same or different materials as needed, and is not particularly limited.

According to an embodiment of the present invention, the supporting substrate may be a substrate having a multi-layer structure of polyethylene terephthalate (PET), a structure of two or more layers formed by coextrusion of polymethyl methacrylate (PMMA) / polycarbonate (PC) May be a description.

Further, according to an embodiment of the present invention, the supporting substrate may be a substrate comprising a copolymer of polymethylmethacrylate (PMMA) and polycarbonate (PC).

Further, according to one embodiment of the present invention, the supporting substrate may be a substrate comprising polyacrylate or triacetyl cellulose.

The thickness of the supporting substrate is not particularly limited, but a supporting substrate having a thickness of from about 20 占 퐉 to about 1,500 占 퐉, from about 30 占 퐉 to about 1,200 占 퐉, or from about 50 占 퐉 to about 800 占 퐉 may be used.

On the other hand, when a film having a large refractive index anisotropy such as PET is used for the supporting substrate, it is preferable that the retardation value R _th in the thickness direction of the supporting substrate is 9000 nm or more. According to the studies of the present inventors, when the refractive index anisotropy of the supporting substrate is large, a phenomenon in which the polarizing sunglasses is worn and the visibility of the display device using the polarizing plate of the present invention is deteriorated may occur. However, even when the supporting substrate has the refractive index anisotropy, the phenomenon is prevented when the retardation value in the thickness direction is 9000 nm or more.

Alternatively, the first coating layer 116 and / or the second coating layer 114 may include, for example, but are not limited to, for example, 3 to 6 functional acrylates that are each independently the same or different; And a binder comprising at least one member selected from the group consisting of 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers, and a photoinitiator. At this time, if necessary, the coating composition may further contain inorganic fine particles, other additives, and / or an organic solvent.

The term 'acrylate' refers to an acrylate monomer including both acrylate and methacrylate, or a derivative having a substituent introduced into acrylate or methacrylate.

The 3 to 6 functional acrylates include, for example, trimethylolpropane triacrylate (TMPTA), trimethylolpropane ethoxy triacrylate (TMPEOTA), glycerin propoxylated triacrylate (GPTA), pentaerythritol Tetraacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), and the like. The 3 to 6 functional acrylate monomers may be used alone or in combination of two or more.

The above-mentioned one or two functional acrylates are, for example, selected from the group consisting of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hexanediol diacrylate (HDDA), tripropylene glycol diacrylate ), And ethylene glycol diacrylate (EGDA). The above monomers 1 to 2 functional acrylate monomers may be used singly or in combination of two or more.

The photo-curable elastomer refers to a polymer material containing a functional group that can be cross-linked by ultraviolet irradiation and exhibiting elasticity. When the coating composition of the present invention further comprises a photo-curable elastomer as the binder, the photo-curable elastomer is crosslinked and polymerized with the 3- to 6-functional acrylate-based monomer so that the first coating layer and / And flexibility and impact resistance can be imparted.

In accordance with one embodiment of the present invention, the photocurable elastomer has a melt index of at least about 15%, such as from about 15% to about 200%, or from about 20% to about 200%, or about 20%, as measured by ASTM D638. % &Lt; / RTI &gt; to about 150%. When the coating composition contains a photo-curable elastomer having a elongation in the same range as the binder, it is possible to form a crosslinked copolymer together with other binders to impart high hardness to the first coating layer and / or the second coating layer without deteriorating other physical properties And flexibility. In particular, it is possible to prevent damage due to an external impact and ensure impact resistance. Particularly, in the case of the first coating layer formed on the lower surface of the high hardness plastic film, it is preferable to include a photocurable elastomer in terms of flexibility and impact resistance.

Also, according to one embodiment of the present invention, the photocurable elastomer may be a polymer or oligomer having a weight average molecular weight ranging from about 1,000 to about 600,000 g / mol, or from about 10,000 to about 600,000 g / mol.

The photo-curable elastomer may be at least one selected from the group consisting of, for example, polycaprolactone, urethane acrylate-based polymer, and polyrotaxane.

Among the materials usable as the photo-curable elastomer, polycaprolactone is formed by the ring-opening polymerization of caprolactone and has excellent physical properties such as flexibility, impact resistance and durability.

The urethane acrylate-based polymer has urethane bonds and has excellent elasticity and durability.

The polyrotaxane refers to a compound in which a dumbbell shaped molecule and a macrocycle are structurally intercalated. Wherein the dumbbell-shaped molecule comprises a constant linear molecule and a blocking group disposed at both ends of the linear molecule, wherein the linear molecule penetrates the interior of the cyclic compound and the cyclic compound moves along the linear molecule And is prevented from being separated by the sealer.

According to one embodiment of the present invention, there is provided a cyclic compound having a lactone-based compound to which a (meth) acrylate-based compound is introduced at the terminal thereof; Linear molecules passing through the cyclic compound; And a blocking group disposed at both ends of the linear molecule to prevent the elimination of the cyclic compound.

In this case, the cyclic compound can be used without any limitations as long as it has a size enough to penetrate or surround the linear molecule. The cyclic compound can be a hydroxyl group, an amino group, a carboxyl group, a thiol group or an aldehyde group Functional groups of the &lt; / RTI &gt; Specific examples of such cyclic compounds include? -Cyclodextrin,? -Cyclodextrin,? -Cyclodextrin, and mixtures thereof.

As the linear molecule, a compound having a straight chain form can be used without any limitation, provided that the linear molecule has a molecular weight of a certain level or higher. However, a polyalkylene compound or a polylactone compound can be used. Specifically, a polyoxyalkylene compound containing an oxyalkylene repeating unit having 1 to 8 carbon atoms or a polylactone based compound having a lactone repeating unit having 3 to 10 carbon atoms can be used.

On the other hand, the blocking group can be appropriately controlled according to the properties of the produced rotaxane compound, and examples thereof include one selected from the group consisting of a dinitrophenyl group, a cyclodextrin group, an adamantane group, a trityl group, a fluororesin group, Two or more species can be used.

The polyrotasane compound as described above has excellent scratch resistance and can exhibit self-healing ability in the event of scratch or external damage.

Next, the amphipathic block copolymer comprises, in the molecule, a miscible block and an immiscible block for the 3- to 6-functional acrylate, &Lt; / RTI &gt; For example, the amphiphilic block copolymer may contain both blocks that are miscible with the 3 to 6 functional acrylates and blocks that are incompatible with the 3 to 6 functional acrylates in one molecule.

The miscible block includes repeating units exhibiting high affinity or compatibility with the 3 to 6 functional acrylates. Examples of the miscible block include polyethylene oxide (PEO), polypropylene oxide (PPO) ), Polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polycaprolactone (PCL), polystyrene (PS), or polyacrylic acid (PAA) And the like, but the present invention is not limited thereto.

The incompatible block includes repeating units exhibiting low affinity or compatibility with the 3-6 functional acrylates. Examples of the non-miscible block include polypropylene oxide (PPO), polybutylene oxide (PBO), polyhexylene oxide (PHO), polybutadiene (PB), polydimethyl siloxane (PDMS), polybutyl acrylate (PBA) or polyalkyl methacrylate polyalkyl methacrylate, PAMA), and the like, but the present invention is not limited thereto.

In the amphiphilic block copolymer, the ratio of the miscible block to the immiscible block is not particularly limited. For example, the composition ratio of each miscible and immiscible block is about 5 : 95 to about 95: 5.

According to one embodiment of the present invention, the amphiphilic block copolymer may be a linear multiblock (e.g., a diblock copolymer, a triblock copolymer, a tetrablock copolymer, etc.) ) Structure, a branched multi-block, or a multi-block structure in a three-dimensional shape, and is not particularly limited. For example, when the amphiphilic block copolymer is a diblock copolymer, the miscible block (M) and the incompatible block (I) may have repeating units of -MI- or -IM- have. -MIM-form or -IMI-form in which the miscible block (M), the incompatible block (I) and the miscible block (M) are alternately arranged when the amphiphilic block copolymer is a triblock copolymer Can have repeating units.

According to one embodiment of the present invention, the number average molecular weight of the amphiphilic block copolymer may be from about 1,000 to about 100,000 g / mol, or from about 2,000 to about 50,000 g / mol.

The amphiphilic block copolymer has self-assembling properties because it contains both miscible and immiscible blocks with respect to the binder. That is, in the process of mixing the amphiphilic block copolymer with the binder in the hard coating composition, depending on the difference in affinity of each block with respect to the binder, the miscible block is directed to the binder side, May be in the opposite direction, i. E. Inwardly directed, to have a spherical or spherical micelle shape. The micelle may have a particle diameter of about 100 nm or less, for example, about 5 to about 100 nm. At this time, if the particle size of the micelle is more than 100 nm, the hard coat layer may be optically influenced and the transmittance may be lowered, so that the particle diameter is preferably 100 nm or less.

When the amphiphilic block copolymer is further included in the coating composition of the present invention as described above, toughness and impact resistance of the first coating layer and / or the second coating layer can be increased without deteriorating the mechanical properties. In particular, the amphiphilic block copolymer may be present in the form of micelles, wherein the micelles are self-assembled such that the miscible block towards the binder faces outward to form a first coating layer comprising the amphiphilic block copolymer and / The impact resistance and the compatibility can be enhanced without deteriorating the mechanical properties of the second coating layer.

According to one embodiment of the present invention, the coating composition for forming the first and second coating layers is a binder which comprises, in addition to the 3- to 6-functional acrylate, a 1 to 2 functional acrylate, a photo- Amphiphilic block copolymers, and amphiphilic block copolymers. Wherein at least one binder selected from the group consisting of 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers is present in an amount of from about 1 to about 100 parts by weight per 100 parts by weight of the 3- to 6-functional acrylate 50 parts by weight, or about 10 to about 50 parts by weight, or about 20 to 50 parts by weight. On the other hand, the content of the at least one binder selected from the group consisting of the above-mentioned 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers can be appropriately controlled according to the physical properties of the coating layer to be achieved, It is not limited to the above range.

Examples of the photoinitiator include 1-hydroxy-cyclohexyl-phenylketone, 2-hydroxy-2-methyl-1-phenyl- 2-benzoyl-2- (dimethylamino) -1- [4- (4-methoxyphenyl) -2-methyl-1-propanone, methylbenzoylformate, -Morpholin yl) phenyl] -1-butanone, 2-methyl-1- [4- (methylcio) , 6-trimethylbenzoyl) -phosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, and the like. Products currently on the market include Irgacure 184, Irgacure 500, Irgacure 651, Irgacure 369, Irgacure 907, Darocur 1173, Darocur MBF, Irgacure 819, Darocur TPO, Irgacure 907 and Esacure KIP 100F. These photoinitiators may be used alone or in combination of two or more.

On the other hand, as the inorganic fine particles, there may be used inorganic fine particles having a particle size of nanoscale, for example, nanoparticles having a particle size of about 100 nm or less, or about 10 to about 100 nm, or about 10 to about 50 nm. As the inorganic fine particles, for example, silica fine particles, aluminum oxide particles, titanium oxide particles, or zinc oxide particles can be used. When the inorganic microfine particle is included, the hardness of the high hardness plastic film can be further improved. In particular, in the case of the second coating layer formed on the high hardness plastic film, inorganic microfine particles .

Meanwhile, the coating composition of the present invention may be used as a solvent-free formulation or as a solvent formulation by adding an organic solvent. According to an embodiment of the present invention, the organic solvent may be an alcohol-based solvent such as methanol, ethanol, isopropyl alcohol, butanol, 2- Alkoxy alcohol solvents such as ethoxy ethanol, 2-ethoxy ethanol and 1-methoxy-2-propanol, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl propyl ketone and cyclohexanone, Propylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethyl glycol monoethyl ether, diethyl glycol monopropyl ether, diethyl Ether solvents such as tetrahydrofuran, glycol monobutyl ether and diethylene glycol-2-ethylhexyl ether, benzene, toluene, An aromatic solvent such as alkylene may be used alone or in combination.

According to one embodiment of the present invention, the viscosity of the coating composition is not particularly limited as long as it has appropriate fluidity and applicability, and may have a viscosity of, for example, about 1,200 cps or less at a temperature of 25 캜.

Meanwhile, the coating composition of the present invention may further include additives commonly used in the art such as surfactants, yellowing inhibitors, leveling agents, antifouling agents, etc., in addition to the above-mentioned components. The content is not particularly limited, and can be varied within a range that does not deteriorate the physical properties of the composition of the present invention. For example, about 100 parts by weight of the solid content contained in the coating composition, about 0.1 to about 10 parts by weight &Lt; / RTI &gt;

As the surfactant, a fluorine-based acrylate, a fluorine-based surfactant, or a silicone-based surfactant having 1 to 2 functionalities may be used. As the yellowing inhibitor, a benzophenone-based compound or a benzotriazole-based compound may be used.

According to one embodiment of the present invention, the coating composition comprises 3 to 6 functional acrylates; 1 to 2 functional acrylates, photo-curable elastomers and amphiphilic block copolymers; Inorganic fine particles; Photoinitiators; And an organic solvent, and the weight ratio of the solid content: the organic solvent to the solid content including the binder, the inorganic fine particles, and the photoinitiator is about 70:30 to about 99: 1.

When the solid content of the coating composition is 100 parts by weight, the binder may be contained in an amount of about 35 to 85 parts by weight, the inorganic fine particles may be contained in an amount of about 10 to 60 parts by weight, and the amount of the photoinitiator may be about 0.5 to 10 parts by weight .

According to another embodiment of the present invention, the coating composition comprises: 3 to 6 functional acrylates; And one or more selected from the group consisting of 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers; Photoinitiators; And an organic solvent, wherein the weight ratio of the 3- to 6-functional acrylate and the binder may be about 20:80 to 80:20.

When the high hardness plastic film of the present invention has a structure including the substrate, the first coating layer and the second coating layer, the coating composition is applied to the lower surface and the upper surface of the supporting substrate, respectively, to form the first coating layer and the second coating layer , A high hardness plastic film of the present invention can be obtained. In this case, the method of applying the coating composition is not particularly limited as long as it can be used in the art to which the present technology belongs. For example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, A gravure coating method, a comma coating method, a slot die coating method, a solution casting method, or a lip coating method.

At this time, the first coating layer and the second coating layer may be sequentially coated on the lower surface and the upper surface of the supporting substrate, respectively, or may be applied simultaneously. For example, in the high hardness plastic film of the present invention, first coating and first photocuring the first coating composition on one side of the supporting substrate, then applying the second coating composition to the other side of the supporting substrate again And a second photo-curing step. At this time, the first coating composition and the second coating composition may have the same or different compositions.

On the other hand, in the second photo-curing step, the ultraviolet ray irradiation is performed on the opposite side to the side on which the first coating composition is applied, so that the curl, which may be caused by the hardening shrinkage in the first photo-curing step, A film can be obtained. Therefore, an additional planarization process is unnecessary.

The first coating layer and the second coating layer may have a thickness of about 40 탆 or more, for example, about 40 탆 to about 300 탆 or about 70 탆 to about 150 탆 after being completely cured. When the thicknesses of the first coating layer and the second coating layer satisfy the above numerical ranges, a hardness plastic film having a pencil hardness of 7H or more, preferably 8H or more, can be obtained under a load of 1 kg. However, the thicknesses of the first coating layer and the second coating layer may be 40 占 퐉 or more, and the thicknesses of the first coating layer and the second coating layer are not necessarily the same. That is, the thicknesses of the first coating layer and the second coating layer may be the same or different. From the viewpoint of durability, it is more preferable that the thickness of the first coating layer formed on the lower surface of the supporting substrate is thicker than the thickness of the second coating layer.

As described above, the high hardness plastic film of the present invention including the first coating layer and the second coating layer on the upper and lower surfaces of the supporting substrate has a thickness of 100 탆 or more, for example, about 100 탆 to about 2100 탆, about 150 Mu] m to about 1500 [mu] m or about 200 [mu] m to about 500 [mu] m.

When the high hardness plastic film of the present invention is a substrate-free monolayer film, the single-layer hardness plastic film is the same as the coating composition forming the first coating layer and the second coating layer May be formed by a coating composition. That is, the coating composition may be formed by curing a coating composition comprising the binder and the photoinitiator. The coating composition may further include inorganic microparticles, other additives, and / or an organic solvent, if necessary. The detailed contents of each component included in the coating composition are as described above, and thus a detailed description thereof will be omitted.

According to one embodiment of the present invention, the high hardness plastic film made of the single layer film can be produced by applying the coating composition on the release film, photo-curing the coating composition, and then peeling off the coating layer.

At this time, the thickness of the monolayer film may be about 40 占 퐉 or more, for example, about 40 占 퐉 to about 500 占 퐉, or 40 占 퐉 to about 300 占 퐉, or about 70 占 퐉 to about 150 占 퐉. In the case of a single layer film of an inorganic material, a hard coating film can be formed with a thick thickness as described above because it does not contain a supporting substrate and thus is free from the influence of shrinkage of the substrate during the photo-curing process, When the thickness of the single-layer film satisfies the above-described numerical value range, a high hardness plastic film having excellent elastic modulus and pencil hardness can be obtained.

On the other hand, when the polarizing plate integrated with the high hardness plastic film of the present invention is placed on a plane after exposure for 70 hours or more at a temperature of 50 ° C or higher and a humidity of 80% or higher, each corner or one side of the high hardness plastic film The maximum spacing distance may be about 1.0 mm or less, or about 0.6 mm or less, or about 0.3 mm or less. More specifically, when placed on a plane after exposure for 70 to 100 hours at a temperature of 50 to 90 占 폚 and a humidity of 80% to 90%, each edge of the high hardness plastic film or a distance The maximum value may be about 1.0 mm or less, or about 0.6 mm or less, or about 0.3 mm or less.

Generally, when a hard coating film is attached to a polarizer protective film, curling of the polarizing plate tends to occur due to a difference in shrinkage ratio between the protective film on which the hard coating layer is not formed and the hard coating film, And edge light leakage occurs due to the polarizing plate curl. However, in the case of the high hardness plastic film of the present invention, as described above, since the flatness of the film itself is very high and the curl is small and the thickness is relatively thick, the curl of the polarizing plate hardly occurs when attached to the polarizer, There is an advantage that such a problem can be prevented.

In addition, the polarizing plate in which the high hardness plastic film of the present invention is integrated can exhibit excellent impact resistance and high hardness, as compared with a polarizing plate including a glass panel or a conventional hard coating film. For example, the polarizing plate in which the high hardness plastic film is integrated can exhibit impact resistance such that cracks do not occur when free fall of 22 g of iron ball is repeated 10 times at a height of 50 cm, 80 cm, or 100 cm.

The polarizing plate in which the high hardness plastic film of the present invention is integrated can have a pencil hardness of 7H or more, 8H or more, or 9H or more at a load of 1 kg. In the case of a hard coating film for a polarizing plate developed so far, the pencil hardness was only about 3H under a load of 1 kg, so that the strength was insufficient to replace the cover plate. However, in the case of the polarizing plate in which the high hardness plastic film of the present invention is integrated, since the pencil hardness is 7H or more, preferably 8H or more at 1 kg load and its strength is very high, when the polarizing plate of the present invention is used, Sufficient durability can be ensured even if it is not used.

The polarizing plate in which the high hardness plastic film of the present invention is integrated can cause scratches of 2 or less when the steel wool # 0000 is mounted on a friction tester and then reciprocated 400 times under a load of 500 g.

In addition, the polarizing plate in which the high hardness plastic film of the present invention is integrated may have a light transmittance of 40% or more at a wavelength of 400 to 700 nm.

The polarizing plate in which the high hardness plastic film of the present invention is integrated may have an initial color b value (b * according to CIE 1976 L * a * b * color space) of 3.5 or less. Also, the difference between the initial color b value and the color b value after 72 hours or more exposure to ultraviolet lamps in the UVB wavelength region may be 0.5 or less, or 0.4 or less.

As described above, the polarizing plate in which the high hardness plastic film of the present invention is integrated is excellent in scratch resistance, pencil hardness, etc., and is excellent in curling property, transparency and coloring property, Can be used.

Meanwhile, according to one embodiment of the present invention, the high hardness plastic film may be located at the top of the polarizing plate, or may be located at the top of the display device. In general, currently used polarizing plates protect a display device by placing a protective film such as TAC for improving surface hardness, abrasion resistance and scratch resistance, and forming a hard coating layer on the protective film. However, in the case of a protective film such as TAC or a protective film formed with a hard coating layer, a method of adding a cover plate made of glass on the protective film or the protective film on which the hard coating layer is formed is used because the strength and durability are insufficient. However, this method also has problems such as complication of the process, weight increase due to the glass, and risk of breakage. However, since the high hardness plastic film of the present invention has a high surface hardness, abrasion resistance and scratch resistance in its own form integrated with the polarizer, it is necessary to form such a separate hard coat layer or apply a separate cover plate none.

However, according to another embodiment of the present invention, a functional coating layer such as an antireflection layer, an antistatic layer or an anti-pollution layer may be formed on the high hardness plastic film, if necessary, It does not.

3 and 4, the high hardness plastic film 110 of the present invention may further include a print layer 170, if necessary. The printing layer 170 is for covering the bezel portion of a display panel or the like. In general, the printing layer 170 is formed on the lower surface of the lower protective film of the polarizer. However, when the print layer 170 is formed under the polarizer, as in the conventional art, since light is absorbed by the polarizer, it is difficult to realize bright colors such as white. However, when the printing layer 170 is formed on the high-hardness plastic film as in the present invention, there is an advantage that the printing layer of various colors can be formed because the printing layer exists on the polarizer.

3, the print layer 170 may be formed on the lower surface of the hard plastic film 110 if the hard plastic film 110 is a single layer film. On the other hand, when the high hardness plastic film 110 includes the supporting substrate, the first coating layer, and the second coating layer, the printing layer 170 can be formed at various positions. 4A, the print layer 170 may be formed on the lower surface of the high hardness plastic film, that is, on the lower surface of the first coating layer 116. Alternatively, as shown in FIG. 4B, As shown in FIG. 4C, it may be formed on the lower surface of the supporting substrate 112, or may be formed on the upper surface of the supporting substrate 112.

As described above, the high hardness plastic film of the present invention is excellent in scratch resistance, hardness characteristics, etc., and has excellent curl characteristics, transparency and color sensitivity, and is integrated with a polarizer to form a polarizing plate. The polarizer can be adequately protected without a plate or the like.

1 to 3, an adhesive layer 160 is formed on the lower part of the polarizer 130 for the convenience of adhesion between the polarizer 100 and other elements, . At this time, the adhesive layer 160 may be formed of a variety of pressure sensitive adhesives or adhesives that are generally manufactured and used in the related art. For example, the pressure sensitive adhesive layer 160 may be an acrylic adhesive, a styrene butadiene rubber adhesive, an epoxy adhesive, Alcohol-based adhesives, urethane-based adhesives, and the like can be used without limitation.

In the polarizing plate of the present invention, the adhesive layer 160 may be directly attached to the lower surface of the polarizer 130 as shown in FIG. 1, and may be attached to the adhesive layer 160 160 and the polarizer 130 may be interleaved with other layers.

For example, as shown in FIG. 2, the polarizing plate 100 of the present invention may further include a protective layer 150 on the lower surface of the polarizer. As the protective layer 150, a TAC film formed to protect the polarizer in the related art may be used, or various resin layers may be used, for example, a layer formed by curing a thermosetting polymer resin or a photocurable polymer resin May be used without limitation. For example, the protective layer 150 may be a layer formed by curing an active energy ray-curable resin composition, wherein the active energy ray-curable resin composition is the same as an epoxy-based monomer or an oxetane- A cationically curable resin composition comprising a cationic curable monomer and a cationic initiator, or a radical curable monomer composition such as an acrylate monomer and a radical initiator.

According to an embodiment of the present invention, the protective layer 150 may be formed by laminating a TAC film on the lower surface of the polarizer 130.

According to another embodiment of the present invention, the protective layer 150 may be formed by applying the resin composition on the polarizer 130 and then curing by irradiating active energy rays such as UV and electron beams. 2 illustrates a case where the protective layer 150 is formed of one layer. However, the present invention is not limited thereto, and the protective layer may have a multi-layered structure of two or more layers.

Alternatively, the polarizing plate 100 of the present invention may further include a second adhesive layer 120 'and an optical functional layer 140 on the lower surface of the polarizer 130, as shown in FIG.

The second adhesive layer 120 'is for bonding the optically functional layer 140 and the polarizer 130 to each other. Like the first adhesive layer 120, the second adhesive layer 120' And may be formed of an adhesive. However, the types and compositions of the adhesives forming the first adhesive layer and the second adhesive layer may be the same or different.

Meanwhile, the optical function layer 140 may be formed of at least one transparent polymer film, a liquid crystal film, or a combination thereof.

As the transparent polymer film, various polymer films generally used in the related art, for example, a cellulose film, an acrylic film, a cycloolefin film, a polyester film, a polycarbonate film, have. In addition, the transparent polymer film may be optically isotropic, anisotropic, a protective film for protecting the polarizer, or a compensation film for compensating for a viewing angle or the like. The compensation film may be, for example, a ± A film, a ± B film, a ± C film, or a combination thereof.

3 illustrates a case where the optical function layer 140 is one layer. However, the present invention is not limited thereto, and the optical function layer 140 may be a multi-layer or multilayer film of two or more layers It is possible.

Although not shown, the polarizing plate of the present invention may include a circularly polarizing film or a non-polarizing film as a supporting base material of the high hardness plastic film 110, if necessary.

According to the studies of the present inventors, when a polarizing plate is applied to a display device wearing polarized sunglasses, the phenomenon of visibility deteriorates.

Therefore, in order to compensate for this, it is possible to dispose a film for directing circularly polarized light or non-polarized light to the top of the polarizer (PVA). For example, when a film for guiding linearly polarized light to circularly polarized light or unpolarized light is used as the supporting base material of the high hardness plastic film 110, a circular polarized light induction film or a non- It is advantageous because it is possible to exhibit the effect (sunglass free effect) that the image quality is prevented from being lowered even when the polarized sunglasses are worn by the high hardness plastic film without separately using.

On the other hand, the film for guiding the circularly polarized light may be a quarter wave plate (QWP), and the quarter wave plate may be a 1/4 wave plate manufactured and distributed in the related art For example, uniaxially stretched cycloolefin-based films, uniaxially stretched polyethylene terephthalate films, uniaxially stretched polycarbonate films, liquid crystal films, and the like can be used without limitation.

As the non-polarized light-inducing film, for example, a uniaxially stretched polyethylene terephthalate film or the like can be used.

According to one embodiment of the present invention, a polyethylene terephthalate film uniaxially stretched by a supporting substrate of the high hardness plastic film 110 may be used.

Since the polarizing plate of the present invention is made of a high hardness plastic film including a coating layer whose elastic modulus measured by ASTM D882 is not less than 2000 MPa, Even if the polarizing plate is disposed at the outermost periphery of the display device without the cover plate, it is possible to realize an apparatus having high durability and high resistance. In addition, the polarizing plate of the present invention uses a high hardness plastic film as a substitute for an upper protective film of a linear polarizer, thereby reducing the number of films included in the entire device, thereby realizing a thinner device.

Next, a display device including the polarizing plate of the present invention will be described. More specifically, the display device of the present invention includes a display panel; And a polarizing plate disposed on the display panel and having a polarizer and a high hardness plastic film integrated.

As described above, since the display device of the present invention includes the polarizing plate in which the high hardness plastic film and the polarizer are integrated, excellent surface hardness, impact resistance and abrasion resistance can be obtained without using a separate cover plate such as glass or tempered glass on the upper surface of the polarizing plate And durability can be realized, and a thin and light device can be realized by a simpler process. In addition, there is an advantage that breakage due to an external impact, which may occur in using glass or tempered glass, can be prevented.

Fig. 11 shows a polarizing plate A used in a conventional display device and a polarizing plate B used in a display device according to an embodiment of the present invention.

Referring to FIG. 11A (left side), a polarizing plate generally used in a conventional display device is provided with a polarizer protective film such as TAC on the upper and lower surfaces of a polarizer in order to protect the polarizer, It is difficult to achieve the surface strength, and the structure has a structure in which a hard coating layer is coated on the protective film on the upper surface or a separate cover plate is further provided on the protective film coated with the hard coating layer. In general, since the cover plate is made of glass or tempered glass, the weight of the final product is increased, and the surface hardness of the glass can be increased.

However, referring to FIG. 11B (right), since the polarizer used in the display device according to an embodiment of the present invention is formed by integrating the polarizer and the high hardness plastic film, a separate cover It is possible to realize an excellent rheometer characteristic, scratch resistance, and durability without using a plate, and a thinner and lighter device can be realized.

5 and 6 show a display device according to an embodiment of the present invention.

5, the display device of the present invention includes a display panel 300; And a polarizing plate 100 disposed on the display panel and having the polarizer 130 and the hard plastic film 110 integrated by the first adhesive layer 120. At this time, the display panel 300 may be, for example, a liquid crystal panel (LCD panel), a PDP panel, or an OLED panel. Meanwhile, since the polarizer 100 has the same structure as that of the polarizer of the present invention, a detailed description thereof will be omitted.

7 to 10, the display device of the present invention includes an upper substrate 410, a lower substrate 430, and an upper substrate 410 and a lower substrate 430, A liquid crystal panel 400 including a liquid crystal cell 420 interposed between the liquid crystal panel 400 and the liquid crystal panel 420; And a polarizing plate 100 disposed on the upper substrate 410 and having a polarizer 130 and a hard plastic film 110 integrated with the first adhesive layer 120.

Also, at this time, it is preferable that the hard plastic film 110 includes a coating layer having an elastic modulus measured by ASTM D882 of not less than 2000 MPa.

1, the high hardness plastic film 110 includes a supporting substrate 112, a second coating layer 114 formed on the upper surface of the supporting substrate 112, And a first coating layer 116 formed on a lower surface of the hard coating film 112. The thickness of the hard coating plastic film 110 may be 100 占 퐉 or more and 100 占 퐉 to 2100 占 퐉. 2, the high hardness plastic film 110 has a thickness of 40 占 퐉 or more, preferably 40 占 퐉 to 500 占 퐉, or 40 占 퐉 to 300 占 퐉, And may be a substrate-free film.

As the liquid crystal panel 400, a liquid crystal panel that is generally manufactured and circulated in the related art can be used without limitation. The upper substrate 410 and the lower substrate 430 of the liquid crystal panel 400 may be made of a transparent material such as a glass or a light-transmitting plastic substrate. The upper substrate and the lower substrate are opposed to each other with a predetermined gap therebetween, and switching elements for driving the liquid crystal cell are formed on the facing surfaces of the upper substrate and the lower substrate.

The liquid crystal cell 420 is interposed between the upper substrate 410 and the lower substrate 430 and is made of liquid crystals having positive dielectric anisotropy.

In general, the liquid crystal cell may have a twisted nematic (TN) mode, a super twisted nematic (STN) mode, a vertical alignment mode (VA) mode, ), A polymer dispersed liquid crystal (PDLC) method, an electric field controlled birefringence (ECB) method, or a transverse electric field (IPS) method. It is particularly preferable that the liquid crystal display device is of the electric field controlled birefringence (ECB) method or the transverse electric field (IPS) method in view of the viewing angle side, but the present invention is not limited thereto.

However, in the liquid crystal display of the present invention, when a polarizing plate including the second adhesive layer 120 'and the optical functional layer 140 is used as the polarizing plate 100 as shown in FIGS. 8 and 9 And the optical function layer 140 may be a compensation film for compensating the viewing angle of the liquid crystal cell, and the compensation film may be selected and used in an appropriate combination according to the driving mode of the liquid crystal cell.

For example, when the liquid crystal panel is an IPS-LCD panel, it is preferable to use a laminate of -B film and + C film as the compensation film. When the liquid crystal panel is a VA-LCD panel, it is preferable to use a -B film or a laminate of + A film and + C film as the compensation film. When the liquid crystal panel is a TN-LCD panel, it is preferable to use a liquid crystal film, preferably a twist-oriented liquid crystal film (O-film) as the optical functional layer.

In the display device of the present invention as described above, since a polarizing plate including a high hardness plastic film is disposed on the display panel, it is possible to realize the scratch resistance and durability without using a separate cover plate such as glass or tempered glass. And a thinner and lighter device can be realized.

In general, when a hard coating film is adhered to a polarizer protective film, curling of the polarizing plate tends to occur due to a difference in shrinkage ratio between the protective film on which the hard coating layer is not formed and the hard coating film, There is a problem that an edge light leakage occurs due to the polarizing plate curl. However, in the case of the high hardness plastic film of the present invention, as described above, since the flatness of the film itself is very high and the curl is small and the thickness is relatively thick, curling of the polarizing plate hardly occurs when attached to the polarizer, It is possible to prevent the same problem, so that it is possible to provide a display device having excellent curl characteristics, transparency and color characteristics.

Meanwhile, the display device of the present invention may further include a touch sensor that recognizes input information through a user's touch, if necessary. The touch sensor is an apparatus configured to recognize input information through a user's touch. Various types of touch sensors commonly used in the related art, for example, capacitive, pressure sensitive or optical touch sensors Can be used without limitation.

Here, the capacitive touch sensor refers to a touch sensor in which a touch is realized by recognizing a change in a current generated by a static electricity generated in a user's hand, and the pressure sensitive touch sensor is generated by contact of a user The touch panel is realized by touching the conductive layer of the upper plate and the lower plate of the touch sensor by sensing the change of the capacitance caused by the pressure. The capacitance type touch sensor and the pressure sensitive type touch sensor generally include a glass substrate or a plastic substrate on which a conductive layer is formed on one surface or both surfaces.

The optical touch sensor includes a light source unit for emitting a lattice-shaped light beam, and a light-receiving unit for recognizing the light ray. .

Meanwhile, according to one embodiment of the present invention, the touch sensor 220 may be formed of a conductive film including a conductive layer 240 on one side or both sides of the conductive layer 240. At this time, A channel through which electricity flows and a non-channel region where electricity does not flow are formed.

The conductive layer 240 may be made of a transparent electrode material, for example, a metal oxide, a conductive polymer, or a metal, which is well known in the art. It does not.

For example, the conductive layer 240 may include at least one selected from the group consisting of titanium dioxide, cadmium oxide, tin-containing indium tin oxide (ITO), antimony- The conductive layer may include at least one selected from the group consisting of metal oxides such as tin oxide (ITO), fluorine-containing tin oxide (FTO), and zinc oxide (Zinc Oxide) .

The conductive layer 240 may be formed of a metal nanowire, a polythiophene-based conductive material including polystyrene sulfonate (Polysilene sulfonate), a polyselenium conductive polymer, a polyaniline- Polymers, carbon nanotubes, and graphenes, and the conductive layer may be formed by wet coating.

The conductive layer 240 may be formed of an opaque metallic material having a low specific resistance of at least one selected from the group consisting of gold, silver, platinum, copper, tin, and aluminum.

On the other hand, the channel may be formed by a method well known in the art, for example, a method of forming a conductive layer on the entire surface of a conductive film and then removing the non-channel region through etching, or a method such as printing or photolithography A method of forming a conductive layer only in a channel region through a via hole, and the like, and the method is not particularly limited.

In the display device of the present invention, the arrangement of the touch sensor 220 is not particularly limited. As shown in FIG. 6, the touch sensor 220 may be disposed between the display panel 300 and the polarizer 100, or may be disposed on the upper portion of the polarizer 100, And may be disposed on the lower substrate 430 of the liquid crystal panel 400.

7 and 9, the touch sensor 220 is disposed on the upper portion of the lower substrate 430 of the liquid crystal panel 400, that is, on the upper portion of the liquid crystal cell 420 and the lower portion of the lower substrate 430. [ Or may be disposed between the substrates 430. [ 7, the polarizing plate 100 may include a single layer of the high hardness plastic film 110, or the polarizing plate 100 may be formed as shown in FIG. Layered high-hardness plastic film 110 including a supporting substrate 112, a first coating layer 116, and a second coating layer 114. The high-

According to another embodiment of the present invention, as shown in FIGS. 8 and 10, the touch sensor 220 does not have a separate conductive film, and the liquid crystal panel 400 has the upper substrate 410 And the conductive layer 240 may be formed on the upper surface and the lower surface of the polarizer 100 to implement a touch function. In this case, a transparent pressure sensitive adhesive layer 260 may be further disposed between the upper surface of the upper substrate 410 of the liquid crystal panel 400 and the conductive layer 240 formed on the lower surface of the polarizing plate 100. 10, the polarizing plate 100 may include a single layer of the high hardness plastic film 110, and the polarizing plate 100 may be formed of, for example, Layered high-hardness plastic film 110 including a supporting substrate 112, a first coating layer 116, and a second coating layer 114. The high- At this time, the transparent pressure-sensitive adhesive layer 260 may be formed of transparent pressure-sensitive adhesives well known in the art, for example, an acrylic pressure-sensitive adhesive.

Among them, when the touch sensor is disposed at the lower portion of the polarizing plate, the polarizing plate including the high hardness plastic film can be disposed at the uppermost portion. Therefore, even when a separate cover plate such as glass or tempered glass is not used, Durability can be realized, and a thinner and lighter apparatus can be realized.

Best Mode for Carrying Out the Invention Hereinafter, the function and effect of the present invention will be described in more detail through specific examples of the present invention. It is to be understood, however, that these embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.

< Example >

Amphipathic  Preparation of block copolymers

Manufacturing example  One

PDMS -PMMA ( polydimethyl siloxane - 폴리 메틸 메록acrylate ) Preparation of block copolymer

Polydimethyl siloxane and polymethyl methacrylate were prepared by ATRP (Atomic Transfer Radical Polymerization) to prepare PDMS - PMMA block copolymer. Here, the volume ratio of PMMA: PDMS was 1: 1 and the number average molecular weight was about 23,000 g / mol. The mean particle size of the micellar structure formed by the self-assembly of the PDMS-PMMA block copolymer was about 18 nm.

Manufacturing example  2

PMMA-PB-PS ( 폴리 메틸 메록acrylate - polybutadiene -polystyrene) block copolymer

polymethyl methacrylate, polybutadiene, and polystyrene were prepared by atom transfer radical copolymerization to prepare a PMMA-PB-PS block copolymer. At that time, the volume ratio of PMMA: PB: PS was 32:34:34 and the number average molecular weight was about 50,000 g / mol. The mean particle size of the micellar structure formed by the self-assembly of the PMMA-PB-PS block copolymer was about 25 nm.

Photocurable  Preparation of elastomer

Manufacturing example  3

Polyrotasein Of polymer  Produce

After the addition of 50 g of polyrotase polymer grafted with caprolactone [A1000, Advanced Soft Material INC] to the reactor, 4.53 g of Karenz-AOI [2-acryloylethyl isocyanate, Showa Denko KK], Dibutyltin dilaurate [DBTDL, Merck ], 110 mg of hydroquinone monomethylene ether and 315 g of methyl ethyl ketone were added and reacted at 70 ° C for 5 hours to obtain a polylactone containing cyclodextrin in which a polylactone based compound having an acrylate compound introduced at its end was bonded as a cyclic compound Based polymer.

The weight average molecular weight of the resulting polyrotasane polymer was 600,000 g / mol, and the elongation as measured by ASTM D638 was 20%.

Hardness  Manufacture of plastic films

Example  One

8 g (silica 1.6 g, PETA 6.4 g) of pentaerythritol tetraacrylate (PETA) complex in which about 20 wt% of nano silica having a particle diameter of 20 to 30 nm was dispersed, 2 g of the PDMS-PMMA block copolymer of Production Example 1, (Trade name: Irgacure 819), 0.1 g of a benzotriazole yellowing inhibitor (trade name: Tinuvin 400), 0.05 g of a fluorine surfactant (trade name: F477) and 2 g of methyl ethyl ketone were mixed to prepare a second coating A composition (for top application) was prepared.

3 g of the PDMS-PMMA block copolymer of Production Example 1, 0.1 g of a photoinitiator (trade name: Irgacure 819), 0.1 g of a benzotriazole based yellowing inhibitor (trade name: Tinuvin 400), 10 g of a fluorine-based surfactant 0.05 g of an active agent (trade name: F477) and 2 g of methyl ethyl ketone were mixed to prepare a first coating composition (for undercoating) for forming a first coating layer.

The second coating composition was applied onto a 250 [mu] m thick PET support substrate. Next, first light curing was performed on the second coating composition by irradiating ultraviolet rays having a wavelength of 290 to 320 nm.

The first coating composition was applied to the backside of the support substrate. Then, ultraviolet rays having a wavelength of 290 to 320 nm were irradiated and a second photo-curing was performed to produce a high hardness plastic film. The thickness of the coating layer formed on both sides of the substrate after curing was completed was 80 mu m each.

Example  2

In Example 1, 2 g of the PMMA-PB-PS block copolymer of Preparation Example 2 was used instead of the PDMS-PMMA block copolymer of the second coating composition (for top surface application), and the PDMS of the first coating composition -PMMA block copolymer was replaced by 3 g of the PMMA-PB-PS block copolymer of Production Example 2 was used instead of the PMMA-PB-PS block copolymer.

Example  3

9 g (silica 3.6 g, DPHA 5.4 g) of silica-dipentaerythritol hexaacrylate (DPHA) complex in which about 40 wt% of nano silica having a particle diameter of 20 to 30 nm was dispersed, 1 g of polyrotase in Production Example 3, (Trade name: Darocur TPO), 0.1 g of a benzotriazole yellowing inhibitor (trade name: Tinuvin 400), 0.05 g of a fluorine surfactant (trade name: FC4430) and 1 g of methyl ethyl ketone were mixed to prepare a second coating A composition (for top application) was prepared.

The first coating composition (for undercoating) for forming the first coating layer was the same as Example 1 except that 3 g of the polyrotasane of Production Example 3 was used instead of 3 g of the PDMS-PMMA block copolymer of Production Example 1 Method.

A high hardness plastic film was produced in the same manner as in Example 1.

Example  4

In Example 3, a urethane acrylate polymer (trade name: UA340PA, manufactured by Shin-Nakamura Chemical Co., Ltd., weight average molecular weight (Mw) was used instead of 1 g of the polyrotasane of Production Example 3, 2,600 g / mol, elongation of 170% according to ASTM D638) was used as the second coating composition.

A high hardness plastic film was prepared in the same manner as in Example 3.

Example  5

9 g (silica 3.6 g, DPHA 5.4 g) of silica-dipentaerythritol hexaacrylate (DPHA) complex in which about 40 wt% of nano silica having a particle diameter of 20 to 30 nm was dispersed, 1 g of polyrotase in Production Example 3, (Trade name: Darocur TPO), 0.1 g of a benzotriazole yellowing inhibitor (trade name: Tinuvin 400), 0.05 g of a fluorine surfactant (trade name: FC4430) and 1 g of methyl ethyl ketone were mixed to prepare a coating composition.

The coating composition was applied onto a 15 cm x 20 cm, 188 m thick siliconized PET film. Next, photo-curing was performed by irradiating ultraviolet light having a wavelength of 280 to 350 nm with a black light fluorescent lamp.

After the curing was completed, the PET film was peeled off to produce a high hardness plastic film. The thickness of the film after peeling was 180 mu m.

Example  6

8 g (silica 1.6 g, PETA 6.4 g) of pentaerythritol tetraacrylate (PETA) complex in which about 20 wt% of nano silica having a particle diameter of 20 to 30 nm was dispersed, 2 g of the PDMS-PMMA block copolymer of Production Example 1, (Trade name: Irgacure 819), 0.1 g of a benzotriazole yellowing inhibitor (trade name: Tinuvin 400), 0.05 g of a fluorine surfactant (trade name: F477) and 2 g of methyl ethyl ketone were mixed to prepare a coating composition A high hardness plastic film was produced in the same manner as in Example 5.

Hardness  Measurement and evaluation of elastic modulus of plastic film

The elastic modulus of the high hardness plastic film prepared in the above Example was measured according to ASTM D882 and is shown in Table 1 below.

The second coating layer
(Upper surface)
Elastic modulus (unit: MPa) The first coating layer
(if)
Elastic modulus (unit: MPa) Remarks Example 1 2045 950 3rd Floor Example 2 2230 990 3rd Floor Example 3 2500 1150 3rd Floor Example 4 2350 850 3rd Floor Example 5 2500 - Single layer Example 6 2045 - Single layer

Manufacture of polarizing plate and display device

Example  1-1

The high hardness plastic film prepared in Example 1 was laminated and bonded to the PVA film so that the thickness of the adhesive layer was approximately 1 占 퐉 using an acrylic adhesive, and 40 占 퐉 -thick TAC was adhered to the other surface of the PVA in the same manner, .

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Example  2-1

A polarizing plate was produced in the same manner as in Example 1-1 except that the high hardness plastic film prepared in Example 2 was used.

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Example  3-1

A polarizing plate was produced in the same manner as in Example 1-1 except that the high hardness plastic film prepared in Example 3 was used.

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Example  4-1

A polarizing plate was produced in the same manner as in Example 1-1 except that the high hardness plastic film prepared in Example 4 was used.

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Example  5-1

A polarizing plate was produced in the same manner as in Example 1-1 except that the high hardness plastic film prepared in Example 5 was used.

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Example  6-1

A polarizing plate was produced in the same manner as in Example 1-1 except that the high hardness plastic film prepared in Example 6 was used.

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Comparative Example  1-1

On the upper surface of the PVA film, a commercially available polarizing plate for LCD (model: LM230WF301, manufactured by Tosoh Corporation) having a protective film hard coated with a thickness of 4 占 퐉 on a 60 占 퐉 TAC base film and a 60 占 퐉 TAC film as a protective film : &Lt; / RTI &gt; LG Chem).

The polarizing plate was manufactured by applying it to the polarizing plate 100 of the display device having the structure shown in FIG.

Measurement and evaluation of properties of polarizer

1) Polarizer Transmittance

(1) Test piece: The test piece has an absorption axis angle of 45 °, a size of 50 × 50 mm, and three thicknesses of intrinsic thickness.

② Measuring instrument: UV-VIS Spectrophotometer (HITACHI, model U-3310)

③ Measurement method: The specimen was fixed perpendicular to the optical axis of the spectrophotometer, and the absorption axis of the specimen was measured at 45 ° and 135 °. The measurement wavelength range was measured at intervals of 10 nm at 400 to 700 nm.

2) Pencil Hardness

Using a pencil hardness tester, the hardness without scratches was determined after five measurements under a load of 1 kg according to the measurement standard JIS K5400.

3) scratch resistance

The steel wool (# 0000) was mounted on a friction tester, and the number of scratches was observed by reciprocating 400 times under a load of 0.5 kg. The case where the number of scratches was 2 or less, the case where the number of scratches was 2 or more but less than 5, the case where the number of scratches was 5 or more,

4) Impact resistance

The maximum height at which cracks were not generated when free fall of 22 g of iron balls on the surface of the polarizing plate was repeatedly described.

5) Protection characteristics

In order to determine the protective property of the lower module of the polarizing plate, when a glass of 0.5 mm thickness, which is generally used for an LCD, is attached to the lower part of the polarizing plate and a 120 g iron ball falls freely at a height of 20 cm, The protective properties were evaluated for damage.

The properties of the polarizing plates prepared in the above Examples and Comparative Examples were measured in the same manner as the above-mentioned methods.

Transmittance Pencil hardness
(1kg load) Scratch resistance
(500 g load) Impact resistance
(cm) Protection characteristic Example 1-1 42.90% 8H O 100 Not damaged Example 2-1 43.00% 8H O 100 Not damaged Example 3-1 42.70% 9H O 100 Not damaged Example 4-1 42.60% 9H O 100 Not damaged Example 5-1 43.00% 8H O 80 Not damaged Example 6-1 43.10% 8H O 85 Not damaged Comparative Example 1-1 42.80% H or less X 40 Glass breakage

Referring to Table 2, it can be confirmed that the polarizing plate according to the embodiment of the present invention has excellent transmittance, and that the scratch resistance is satisfied even at a relatively high load of 1 kg.

From the viewpoint of impact resistance, it is generally confirmed that cracks are generated when the free fall is repeated ten times at a height of 80 cm to 100 cm, and the impact resistance is superior to that of the comparative example.

Further, it can be confirmed that the polarizer according to the embodiment of the present invention does not damage the glass adhered to the lower part when the 120 g of iron ball is freely dropped at a height of 20 cm, and has excellent physical properties in terms of protection property .

As described above, the polarizing plate according to the embodiment of the present invention has a pencil hardness higher than that of the conventional polarizing plate and has excellent mechanical strength such as scratch resistance, impact resistance, and protection property, In the case of applying a polarizing plate, sufficient durability can be secured without using a separate cover plate, and it is possible to use for a display device requiring durability against an external impact.

100: polarizer
110: High hardness plastic film
112: support substrate
114: Second coating layer
116: first coating layer
120: first adhesive layer
120 ': second adhesive layer
130: Polarizer
140: optical functional layer
150: protective layer
160: Adhesive layer
170: Printed layer
200: touch panel
220: touch sensor
240: Conductive layer
260: transparent pressure-sensitive adhesive layer
300: display panel
400: liquid crystal panel
410: upper substrate
420: liquid crystal cell
430: Lower substrate

Claims (27)

A display panel; And
And a polarizer disposed on the display panel and having a polarizer and a plastic film integrated with each other,
Wherein the plastic film comprises from 3 to 6 functional acrylates; A polymethyl methacrylate-polybutadiene-polystyrene (PMMA-PB-PS) block copolymer, a polyrotaxane and a urethane acrylate polymer having an elongation of 170% according to ASTM D638 A binder comprising at least one member selected from the group consisting of: Inorganic fine particles; And a coating layer formed by curing a coating composition comprising a photoinitiator.
The method according to claim 1,
Wherein the plastic film is located at the top of the display device.
The method according to claim 1,
Wherein the coating layer has an elastic modulus of at least 2000 MPa as measured by ASTM D882.
The method according to claim 1,
Wherein the plastic film is a single layer film of inorganic material.
The method according to claim 1,
Said plastic film comprising: a support substrate; A first coating layer formed on a lower surface of the supporting substrate and having a first elastic modulus; And a second coating layer formed on an upper surface of the supporting substrate and having a second elastic modulus,
Wherein the second coating layer comprises 3 to 6 functional acrylates; A polymethyl methacrylate-polybutadiene-polystyrene (PMMA-PB-PS) block copolymer, a polyrotaxane and a urethane acrylate polymer having an elongation of 170% according to ASTM D638 A binder comprising at least one member selected from the group consisting of: Inorganic fine particles; And a coating layer formed by curing a coating composition comprising a photoinitiator.
6. The method of claim 5,
The first modulus of elasticity is not more than 1500 MPa as measured by ASTM D882,
Wherein the second modulus of elasticity is at least 2000 MPa as measured by ASTM D882.
delete 6. The method of claim 5,
Wherein the first coating layer and the second coating layer are independently the same or different and have a thickness of 40 mu m to 300 mu m.
6. The method of claim 5,
The support substrate may be made of one selected from the group consisting of polyester, polyethylene, cyclic olefin polymer (COP), cyclic olefin copolymer (COC), polyacrylate (PAC), poly (PC), polyethylene (PE), polymethylmethacrylate (PMMA), polyetheretherketone (PEEK), polyethylene naphthalate (PEN), polyetherimide And at least one selected from the group consisting of polyimide (PEI), polyimide (PI), triacetylcellulose (TAC), methyl methacrylate, and fluorine resin.
6. The method of claim 5,
Wherein the supporting substrate is a film that induces circularly polarized light or unpolarized light.
The method according to claim 1,
Wherein the polarizing plate has a pencil hardness of 7H or more under a load of 1 kg.
The method according to claim 1,
Wherein the polarizer has no more than two scratches when the steel wool # 0000 is mounted on a friction tester and then reciprocated 400 times under a load of 500 g.
The method according to claim 1,
Wherein the plastic film further comprises a print layer for concealing a bezel portion of the display panel.
14. The method of claim 13,
Wherein the plastic film comprises a supporting substrate, a first coating layer formed on a lower surface of the supporting substrate, and a second coating layer formed on an upper surface of the supporting substrate,
Wherein the second coating layer comprises 3 to 6 functional acrylates; A polymethyl methacrylate-polybutadiene-polystyrene (PMMA-PB-PS) block copolymer, a polyrotaxane and a urethane acrylate polymer having an elongation of 170% according to ASTM D638 A binder comprising at least one member selected from the group consisting of: Inorganic fine particles; And a coating layer formed by curing a coating composition comprising a photoinitiator,
Wherein the printing layer is formed on an upper surface or a lower surface of the supporting substrate.
14. The method of claim 13,
Wherein the plastic film comprises a supporting substrate, a first coating layer formed on a lower surface of the supporting substrate, and a second coating layer formed on an upper surface of the supporting substrate,
Wherein the second coating layer comprises 3 to 6 functional acrylates; A polymethyl methacrylate-polybutadiene-polystyrene (PMMA-PB-PS) block copolymer, a polyrotaxane and a urethane acrylate polymer having an elongation of 170% according to ASTM D638 A binder comprising at least one member selected from the group consisting of: Inorganic fine particles; And a coating layer formed by curing a coating composition comprising a photoinitiator,
Wherein the printing layer is formed on the lower surface of the first coating layer.
The method according to claim 1,
Wherein the display panel is an LCD panel, a PDP panel, or an OLED panel.
The method according to claim 1,
A second adhesive layer formed on the lower surface of the polarizer; And
And an optical function layer adhered to the second adhesive layer.
18. The method of claim 17,
Wherein the optically functional layer comprises at least one transparent polymer film, a liquid crystal film, or a combination thereof.
19. The method of claim 18,
Wherein the transparent polymer film is at least one selected from the group consisting of a cellulosic film, an acrylic film, a cycloolefin film, a polyester film, and a polycarbonate film.
19. The method of claim 18,
Wherein the transparent polymer film is a protective film or a compensation film.
21. The method of claim 20,
Wherein the compensation film is a +/- A film, a +/- B film, a +/- C film, or a combination thereof.
22. The method of claim 21,
The display panel is an IPS-LCD panel,
Wherein the compensation film is a laminate of -B film and + C film.
22. The method of claim 21,
The display panel is a VA-LCD panel,
Wherein the compensation film is a laminate of a -B film or a + A film and a + C film.
22. The method of claim 21,
The display panel is a TN-LCD panel,
Wherein the optical function layer is a liquid crystal film.
The method according to claim 1,
Wherein the polarizer further comprises an adhesive layer under the polarizer.
The method according to claim 1,
Wherein the polarizing plate comprises a circularly polarized light induction film or a non-polarized light induction film.
The method according to claim 1,
Wherein the display panel includes an upper substrate, a lower substrate, and a liquid crystal cell interposed between the upper substrate and the lower substrate.

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