KR101735689B1 - Circulary polarizing plate, and touch panel and display device comprising the same - Google Patents

Abstract

The present invention relates to a linear polarizer in which a polarizer and a high hardness plastic film are integrated; And a 1/4 wavelength plate disposed below the linear polarizer, and a display device including the circular polarizer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular polarizer, and a touch panel and a display device including the circular polarizer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular polarizer, and a touch panel and a display device including the circular polarizer, and more particularly to a circular polarizer including a high hardness plastic film to replace a cover plate, And a display device.

A circularly polarizing plate is an optical element that forms circularly polarized light having a specific rotation direction, and has a structure in which a 1/4 wavelength plate is laminated on a normal linearly polarizing plate. Such a circularly polarizing plate is widely used for a reflection type liquid crystal display device and an organic electroluminescence device which display an image by using external light without lighting a backlight in a bright place.

On the other hand, in the case of a thin display device such as a liquid crystal display device or an organic electroluminescence device, a cover plate made of glass or tempered glass is mounted on the surface in order to protect the display from external shock or scratch. 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 thinning and lightweight due to its weight and thickness, and is easily broken.

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, there is a demand for development of a technology that is durable and wear-resistant to such a degree that the touch function can be performed, while making the device lighter and thinner.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a thin, high-durability display device having no cover plate by using a linear polarizer in which a polarizer and a high hardness plastic film are integrated in place of a protective film of a circular polarizer, And a touch panel and a display device including the circular polarizer.

In one aspect, the present invention provides a linear polarizer comprising a polarizer and a high hardness plastic film integrated; And a 1/4 wave plate disposed below the linear polarizer.

According to another aspect of the present invention, there is provided a circular polarizer comprising: the circular polarizer; And a touch sensor disposed at an upper portion or a lower portion of the circular polarizer and recognizing input information through a user's touch.

In another aspect, the present invention provides a display panel comprising: a display panel; And a circular polarizer disposed on the upper portion of the display panel.

The high hardness plastic film included in the circular polarizer of the present invention is excellent not only in scratch resistance and hardness but also in curling, transparency and coloring properties and can be suitably used as a protective film for a polarizer.

In particular, the high hardness plastic film has a very high flatness of the film itself, and curling is small, and curling of the polarizing plate hardly occurs when attached to a polarizer, and therefore, a problem of edge light leakage due to curling of the polarizing plate can be prevented.

When the circular polarizer of the present invention including the high hardness plastic film on the upper surface is used, scratch resistance, impact resistance, hardness, and high durability can be ensured without using a separate cover plate made of glass or tempered glass , A thin and light device can be realized by minimizing the number of films included in the apparatus.

Further, in the case of the present invention, since the high hardness plastic film is formed integrally with the circularly polarizing plate, the device assembling process can be further simplified.

In addition, the touch panel and the display device including the circular plate of the present invention do not require the use of a separate cover plate, so that it is possible to prevent damage or the like which may occur in using the cover plate made of glass, Excellent RB characteristics and durability can be realized, and a thinner and lighter weight device can be realized.

1 is a cross-sectional view illustrating a circularly polarizing plate according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a circularly polarizing plate according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a circularly polarizing plate according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a touch panel according to an embodiment of the present invention.
5 is a cross-sectional view illustrating a touch panel 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 display device according to an embodiment of the present invention.
8 is a cross-sectional view illustrating 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 circularly polarizing plate is mounted on the device. In addition, 'upper' means a direction toward a viewer when the circularly 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. Conversely, 'bottom' or 'bottom' refers to a face or a direction arranged toward the opposite side (i.e., the display panel side) of the viewer when the circularly polarizing plate is mounted on the display.

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 index of refraction in the direction of the slow axis in the plane direction of the film or plate, and n _y means the index of refraction in the direction perpendicular to the slow axis in the plane direction of the film or plate. In addition, n _z means the refractive index in the thickness direction of the film or plate.

The term &quot; A film &quot; in the present invention means a film having a refractive index satisfying nx? Ny = nz, where nx> ny denotes a + A film, nx < A film.

In the present invention, the term 'C film' means 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> ny is + 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 = d x (nx - ny)

(2): R _th = d x (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.

Figs. 1 to 3 show implementations of the circular polarizer of the present invention.

1 to 3, the circular polarizer 1 of the present invention includes a linear polarizer 100 including a polarizer 130 and a hard plastic film 110, a quarter wave plate 200, .

More specifically, the circular polarizer 1 of the present invention comprises: a polarizer 130; a linear polarizer 100 having the polarizer 130 and the hardness plastic film 110 integrated; And a 1/4 wave plate 200 disposed below the linear polarizer 100.

Here, the polarizer 130 is an optical element that transmits linearly polarized light in a specific direction. Line polarizers well known in the art can be used without limitation. For example, an iodine compound or a dichroic polarizing material And may be a polyvinyl alcohol (PVA) -based film oriented in a constant direction. 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 .

The adhesive layer 120 is formed on the upper surface of the polarizer 130 for bonding the polarizer 130 and the hard plastic film 110 together. On the other hand, the adhesive layer 120 may be formed using an adhesive for a polarizing plate which is generally manufactured and circulated in the related art, and the kind thereof is not particularly limited. For example, the adhesive layer 120 may be formed of an acrylic adhesive, an adhesive for a dry laminate in which a urethane resin solution and a polyisocyanate resin solution are mixed, a styrene butadiene rubber adhesive, an epoxy adhesive, a polyvinyl alcohol adhesive, a urethane adhesive, Based adhesive such as an adhesive containing an 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 such as a radical-based adhesive containing an 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. In consideration of convenience in the manufacturing process and adhesive force, the adhesive layer 120 is more preferably formed of a photo-curable adhesive.

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

The high hardness plastic film 110 may preferably include at least one coating layer having an elastic modulus of at least 2000 MPa as measured by ASTM D882.

Conventionally, there has been a technique of forming a hard coating layer on a protective film of a polarizing plate. However, in the case of a hard coating layer for a polarizing plate developed up to now, the pencil hardness is only about 3H at a load of 500 g, . However, in the case of the high hardness plastic film applied to the top of the circular polarizer of the present invention, the pencil hardness is 7H or more, preferably 8H or more, more preferably 9H or more at 1 kg load, When the circular polarizer of the present invention is used, sufficient durability can be secured without using a cover plate.

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.

More specifically, as shown in FIG. 1, the high hardness plastic film 110 is formed on the lower surface of the supporting base material 112 of the supporting base material 112 and the supporting base material 112, A first coating layer 116 and a second coating layer 114 formed on the upper surface of the supporting substrate 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 may be about 2000 MPa or more and the elastic modulus of the coating layer formed on the lower surface of the supporting substrate, i.e., the first elastic modulus of the first coating layer 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.

According to one embodiment of the present invention, the first coating layer 116 and / or the second coating layer 114 may include, for example and without limitation, independently of each other the same or different 3 to 6 functionalities Acrylate; 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 photocurable elastomer as the binder, the photocurable elastomer is crosslinked with the 3 to 6 functional acrylate to form a first coating layer and / or a second coating layer after curing 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 coating composition, depending on the difference in affinity of each block with respect to the binder, the miscible block is directed toward the binder side, that is, Direction, i. E., Inwardly, 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 diameter of the micelle is more than about 100 nm, the hard coat layer may be optically affected and the transmittance may be lowered, so that the particle diameter is preferably about 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 thereof 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 at least one selected from the group consisting of 3 to 6 functional acrylates and 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers A binder; 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 binder selected from the group consisting of the 3 to 6 functional acrylates and 1 to 2 functional acrylates, photo-curable elastomers, and amphiphilic block copolymers is 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 占 퐉 or more, for example, about 40 占 퐉 to about 300 占 퐉, or about 70 占 퐉 to about 150 占 퐉, after being fully 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.

On the other hand, 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 as described above has a thickness of 100 탆 or more, for example, 100 탆 to 2100 탆, To 1500 [mu] m or 200 [mu] m to 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, since the support substrate is not included, there is no fear of curling or cracking due to the influence of substrate shrinkage during the photo-curing process, and the hard coating film can be formed with such a high thickness. 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 high hardness plastic film and the circular polarizer of the present invention are placed on a plane after exposure for 70 hours or more at a temperature of 50 DEG C or higher and a humidity of 80% or higher, each edge or one side of the high hardness plastic film is separated The maximum value of the 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 circular polarizer of the present invention can exhibit excellent impact resistance and high hardness, as compared with a polarizing plate comprising a glass panel or a conventional hard coating film. For example, the linear polarizer having the high hardness plastic film, the high hardness plastic film, and the circular polarizer including the linear polarizer were made to fall freely by repeating 10 times at a height of 50 cm, 80 cm, or 100 cm, It is possible to exhibit impact resistance such that cracks do not occur.

The hardness plastic film and the circular polarizer of the present invention may 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 circularly polarizing plate including the linear polarizer integrated with the high hardness plastic film of the present invention, since the pencil hardness is 7H or more, preferably 8H or more at 1 kg load and its strength is very high, A sufficient durability can be ensured without using a cover plate.

In addition, the high hardness plastic film and the circular polarizer of the present invention may cause two or less scratches 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 circular polarizer of the present invention may have a light transmittance of 380 to 780 nm of 40% or more.

In addition, the circular polarizer of the present invention may have an initial color b value (b * according to CIE 1976 L * a * b * color space) of 4.0 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 circular polarizer of the present invention is not only excellent in scratch resistance, pencil hardness, but also excellent in curling property, transparency and coloring property, and can be suitably used instead of a cover plate made of glass.

Meanwhile, according to an embodiment of the present invention, the high hardness plastic film may be located at the top of the linear polarizer, or may be located at the top of the display device. In general, in the case of currently used linear polarizers, a display device is protected by placing a protective film such as TAC for improving the surface hardness, abrasion resistance and scratch resistance and forming a hard coating layer on the upper surface of 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 a contaminated layer may be formed on the high hardness plastic film, if necessary, It is not.

1 and 2, the linear polarizer 100 of the present invention includes an adhesive layer 300 for attaching the quarter-wave plate 200 to the lower surface of the polarizer 130 . In this case, the adhesive layer 300 may be formed of a variety of pressure sensitive adhesives or adhesives that are generally manufactured and used in the art. For example, acrylic adhesive, styrene butadiene rubber adhesive, epoxy adhesive, Alcohol-based adhesives, urethane-based adhesives, and the like can be used without limitation.

3, the linear polarizer 100 of the present invention may further include a functional optical layer 140 between the polarizer 130 and the adhesive layer 300, if necessary. At this time, the functional optical layer 140 may be a protective film for protecting the polarizer 130, a protective layer, a retardation film for compensating the viewing angle, or a combination thereof. Although the functional optical layer 140 is illustrated as a single layer in FIG. 3, the functional optical layer 140 may be formed of two or more layers.

On the other hand, the protective film may be a general polymer film used as a polarizer protective film in the related art, for example, a triacetylcellulose film, an acrylic film, a cycloolefin film, a polycarbonate film, Based film and the like can be used without limitation. In addition, as the protective layer, various layers formed to protect the polarizer in the related art, for example, layers formed by curing a thermosetting polymer resin or a photocurable polymer resin can be used without limitation. In addition, the retardation film can be used in the art without limitation, for example, various films used for viewing angle compensation, such as a ± A film, a ± B film, a ± C film, and the like. The retardation film may be a uniaxially or biaxially stretched polymer film, a liquid crystal film, or the like.

Although not shown in FIG. 3, an adhesive layer may be further included between the functional optical layer 140 and the polarizer 130.

Next, the 1/4 wave plate 200 converts the linearly polarized light into the circularly polarized light and the circularly polarized light into the linearly polarized light, and is disposed below the linearly polarizing plate 100. The 1/4 wave plate 200 and the linear polarizer 100 may be adhered to each other through the adhesive layer 300. The quarter wave plate 200 may have an optical axis parallel to the optical axis of the linear polarizer 100 It is preferably arranged so as to form an angle of approximately 40 DEG to 50 DEG, preferably approximately 45 DEG, with the absorption axis. In addition, the 1/4 wavelength plate preferably has a plane retardation value of 120 nm to 170 nm at a wavelength of 550 nm although not limited thereto. In this case, the in-plane retardation value can be calculated according to the following equation (1), where d denotes the thickness of the quarter-wave plate.

(1): R _in = d x (n _x - n _y )

In the above formula (1), n _x denotes the refractive index in the slow axis direction in the plane direction of the quarter wave plate, and n _y denotes the refractive index in the direction perpendicular to the slow axis in the plane direction of the quarter wave plate . Further, d means the thickness of the quarter-wave plate.

On the other hand, the 1/4 wave plate 200 is a 1/4 wave plate commonly manufactured and circulated in the related art, for example, a uniaxially stretched cycloolefin film, a uniaxially stretched polyethylene terephthalate film, A stretched polycarbonate film, a liquid crystal film, or the like.

Since the upper surface disposed on the side of the viewer of the circular polarizer of the present invention is composed of the linear polarizer integrated with the polarizer and the high hardness plastic film, when the circular polarizer of the present invention is disposed at the top of the display device, It is possible to realize an apparatus having high durability and high resistance even without using a cover plate. In addition, the circular polarizer of the present invention uses a high hardness plastic film as a substitute for the upper protective film of the linear polarizer, thereby reducing the number of films included in the entire device, thereby realizing a thinner device.

Next, a touch panel to which the circular polarizer of the present invention is applied will be described.

FIGS. 4 and 5 show implementations of a touch panel according to an embodiment of the present invention.

4 and 5, a touch panel according to an embodiment of the present invention includes a circular polarizer 1 of the present invention and a touch sensor 3 disposed at the top or bottom of the circular polarizer 1, .

At this time, the circular polarizer 1 is the same as that described above, and a detailed description thereof will be omitted. That is, the polarizing plate 1 includes a linear polarizer 100 in which the polarizer 130 and the high hardness plastic film 110 are integrated; And a 1/4 wave plate 200 disposed below the linear polarizer 100. More specifically, the polarizing plate 1 includes a polarizer 130, an adhesive layer 120 formed on the upper surface of the polarizer 130, and a high hardness plastic film 110 attached to the upper surface of the adhesive layer 120 A linear polarizer 100 in which the polarizer 130 and the high hardness plastic film 110 are integrated; And a 1/4 wave plate 200 disposed below the linear polarizer 100.

1, the high hardness plastic film 110 may include a supporting substrate 112, a second coating layer 114 formed on the upper surface of the supporting substrate 112, And the first coating layer 116 formed on the lower surface of the high-hardness plastic film 112. The high hardness plastic film 110 may have a thickness of 100 mu m or more, for example, 100 mu m to 2100 mu m .

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.

The touch sensor 3 is an apparatus configured to recognize input information through a touch of a user. The touch sensor 3 may include various touch sensors commonly manufactured and distributed in the related art, for example, an optical touch sensor, Capacitive touch sensors, and the like can be used without limitation.

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

Meanwhile, 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 capacitive touch panel and the pressure sensitive type touch panel generally include a glass substrate or a plastic substrate having a conductive layer formed on one surface or both surfaces thereof.

According to an embodiment of the present invention, the touch sensor 3 may be formed of a conductive film including a conductive layer on one side or both sides, though not shown in the drawings. In this case, And a non-channel region in which electricity does not flow are formed.

Meanwhile, the conductive layer may be made of a material such as a transparent electrode, for example, a metal oxide, a conductive polymer, or a metal, which is well known in the art, and its material and forming method are not particularly limited.

For example, the conductive layer may be formed of a material selected from the group consisting of titanium dioxide, cadmium oxide, indium tin oxide (ITO) containing tin, antimony tin oxide (ATO) containing antimony, And a metal oxide composed of fluorine-containing tin oxide (FTO), zinc oxide (Zinc Oxide), or the like, wherein the conductive layer is formed by vapor deposition .

Also, the conductive layer may be formed of a conductive polymer such as a polythiophene-based and a polyselenium-based conductive polymer including metal nanowires and polystyrene sulfonate (Poly (styrenesulfonate)); A conductive polymer such as a polyaniline polymer, a carbon nanotube, and a graphene. The conductive layer may be formed by wet coating.

The conductive layer 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, aluminum and the like.

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.

Meanwhile, in the touch panel of the present invention, the touch sensor 3 may be disposed on the upper or lower portion of the circular polarizer 1, and the arrangement thereof is not particularly limited.

Further, in the touch panel of the present invention, the circularly polarizing plate may be a linear polarizing plate in which a polarizer and a hardness plastic film are integrated; And a 1/4 wavelength plate, and the constitution thereof is not particularly limited. If necessary, the circular polarizer 1 may include a conductive layer on at least one surface thereof. The conductive layer formed on the circular polarizer 1 may operate in conjunction with the conductive film of the touch sensor 3, It is possible to play a role that can be implemented.

The touch panel of the present invention can be implemented in various forms by changing the configuration of the circular polarizer, the configuration of the touch sensor, the arrangement of the circular polarizer and the touch sensor, and the position of the conductive layer.

For example, the touch panel of the present invention may be configured such that a conductive film having conductive layers formed on both surfaces thereof is used as the touch sensor 3, and the touch sensor 3 is disposed below the circular polarizer 1 have. In this case, the circular polarizer 1 may include a protective layer formed by curing the active energy ray-curable resin composition on the lower surface of the quarter-wave plate 200, though not limited thereto.

According to another embodiment of the present invention, in the touch panel of the present invention, the touch sensor 3 is disposed below the circular polarizer 1, and the conductive film having the conductive layer formed on the upper surface thereof is used as the touch sensor 3 , And a circular polarizer including a second adhesive layer and an optically functional layer on the lower surface of the 1/4 wave plate 200 are used as the circular polarizer 1 and the conductive layer is formed on the lower surface of the optically functional layer It is possible.

According to still another embodiment of the present invention, the touch panel of the present invention is a touch panel comprising a touch sensor 3 disposed on an upper part of a circularly polarizing plate 1 and a conductive film And the conductive layer may be formed on the upper surface of the high hardness plastic film 110 of the circularly polarizing plate 1. [

However, the touch panels having such a configuration are merely examples for explaining various configurations of the touch panel of the present invention, and the present invention is not limited thereto. For example, the touch sensor may be composed of one or two conductive layers, but the present invention is not limited thereto.

On the other hand, the touch panel of the present invention may include a transparent pressure-sensitive adhesive layer between the circularly polarizing plate 1 and the touch sensor 3. [ At this time, the transparent pressure-sensitive adhesive layer may be composed of transparent pressure-sensitive adhesives well known in the art, for example, an acrylic pressure-sensitive adhesive.

According to an embodiment of the present invention, in the case of a touch panel of the present invention, in particular, a touch panel in which a touch sensor is disposed at a lower portion of a polarizing plate, the high hardness plastic film may be located at the top of the touch panel . 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 on which the protective film or 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.

In addition, when the touch sensor is disposed on the upper part of the polarizing plate, a thinner device can be realized by reducing the number of films used in the touch sensor by forming a conductive layer on the high hardness plastic film of the polarizing plate .

Next, a display device to which the circular polarizer of the present invention is applied will be described.

Figs. 6 to 8 show implementations of the display device of the present invention. 6 to 8, the display device of the present invention includes the display panel 2 and the circular polarizer 1 of the present invention. The display panel may be a reflective liquid crystal display (LCD) panel or an OLED panel.

At this time, the circular polarizer 1 is the same as that described above, and a detailed description thereof will be omitted. That is, the polarizing plate 1 includes a linear polarizer 100 in which the polarizer 130 and the high hardness plastic film 110 are integrated; And a 1/4 wave plate 200 disposed below the linear polarizer 100.

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 the lower surface of the hard coating layer 112. The hard coating plastic film 110 may have a thickness of 100 mu m or more, for example, 100 mu m to 2100 mu m.

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.

The reflection type liquid crystal display panel may be a reflection type liquid crystal display panel generally manufactured and distributed in the related art, and may include, for example, an upper substrate, a liquid crystal cell, a lower substrate, and a reflection plate .

At this time, the upper substrate and the lower substrate may be made of a transparent material, for example, 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.

Meanwhile, the liquid crystal cell is interposed between the upper substrate and the lower substrate, and is made of liquid crystals having positive dielectric anisotropy. On the other hand, the driving mode is changed according to the arrangement and driving state of the liquid crystal in the liquid crystal cell. Generally, the reflection type liquid crystal display device includes a twisted nematic (TN) method, a super twisted nematic (STN) Various modes such as a liquid crystal (PDLC) method, an electric field controlled birefringence (ECB) method, or a transverse electric field (IPS) method can be used. 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.

The reflector reflects light incident from the outside of the liquid crystal display device to be used as a light source, and is disposed between the lower substrate and the liquid crystal cell or below the lower substrate. The reflector may be manufactured by depositing a metal having conductivity, for example, aluminum or silver.

On the other hand, the circular polarizer of the present invention is disposed on the upper substrate of the reflective liquid crystal display panel. Since the specific contents of the circular polarizer are the same as those described above, a detailed description thereof will be omitted.

Next, the OLED panel may be an OLED panel that is generally manufactured and circulated in the related art. For example, the OLED panel may include a transparent electrode layer formed on a transparent substrate, a metal electrode, and a light emitting layer formed between the transparent electrode and the metal electrode . &Lt; / RTI &gt; Here, the light emitting layer may have a structure in which a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer are sequentially stacked.

7 and 8, the display device of the present invention may further include a touch sensor 3, if necessary. 7, the touch sensor 3 may be positioned between the display panel 2 and the circular polarizer 1, and the touch sensor 3 may be disposed between the display panel 2 and the circular polarizer 1, As shown in FIG.

The touch sensor 3 is an apparatus configured to recognize input information through a touch of a user. The touch sensor 3 may include various touch sensors commonly manufactured and distributed in the related art, for example, an optical touch sensor, Capacitive touch sensors, and the like can be used without limitation. The touch sensor 3 is the same as that described above, and a detailed description thereof will be omitted.

As described above, the display device having the touch sensor can be usefully used as an electronic board.

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

Production of Circular Polarizer

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 the other side of the PVA was coated with a 1/4 wavelength plate (COP film , 40 mu m thickness, optical axis 45 DEG, Zeon) were laminated and bonded to produce a circularly polarizing plate.

Example  2-1

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

Example  3-1

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

Example  4-1

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

Example  5-1

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

Example  6-1

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

Comparative Example  1-1

A polarizing plate for LCD (Model: LM230WF301, manufacturer: LG Chem) A 1/4 wave plate (COP film, 40 μm thick, optical axis 45 degrees, Zeon Co.) was laminated on one side using an acrylic adhesive, Respectively.

Measurement and evaluation of properties of circular polarizer

1) Circular polarizer plate transmittance

(1) Specimen: The specimen was of a size of 30 × 30 mm and a thickness of a specific thickness.

② Measuring instrument: JASCO, model V-7100

(3) The test piece was fixed to the measuring instrument with the light source pointed to it, and the transmittance in the TD (TD) parallel state (MD) was measured. The measurement wavelength range was measured at intervals of 10 nm at 380 to 780 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 was repeatedly performed on the surface of the circular polarizer plate was described.

5) Protection characteristics

In order to judge the protective property of the lower module of the circular polarizer, when 0.5 mm thick glass generally used for LCD is attached to the lower part of the circular polarizer and 120 g of iron beads are freely dropped at a height of 20 cm, The protective properties were evaluated by whether the glass was damaged.

The properties measured by the above-described methods for the circularly polarizing plate prepared in Examples and Comparative Examples are summarized in Table 2 below.

Transmittance Pencil hardness
(1kg load) Scratch resistance
(500 g load) Impact resistance
(cm) Protection characteristic Example 1-1 44.2% 8H O 100 Not damaged Example 2-1 44.2% 8H O 100 Not damaged Example 3-1 44.2% 9H O 100 Not damaged Example 4-1 44.2% 9H O 100 Not damaged Example 5-1 44.3% 8H O 80 Not damaged Example 6-1 44.3% 8H O 85 Not damaged Comparative Example 1-1 44.1% H or less X 40 Glass breakage

Referring to Table 2, it can be seen that the circularly polarizing plate according to the embodiment of the present invention has excellent transmittance and satisfies the scratch resistance even at a load of 1 kg, which is much higher than the 300 g load corresponding to the actual user touch environment .

From the viewpoint of impact resistance, it is generally confirmed that cracks are generated when the free fall is repeated 10 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 circular polarizer according to the embodiment of the present invention has a pencil hardness higher than that of the conventional circular polarizer, and has excellent mechanical strength such as scratch resistance, impact resistance and protection property, When the polarizing plate of the present invention is applied, sufficient durability can be ensured without using a separate cover plate, and it can be used for an electronic board in which durability against touch and external impact is required.

1: circularly polarizing plate
2: Display panel
3: Touch sensor
100: Line polarizer
110: High hardness plastic film
112: support substrate
114: Second coating layer
116: first coating layer
120: adhesive layer
130: Polarizer
140: functional optical layer
200: 1/4 wavelength plate
300: adhesive layer

Claims (23)

A linear polarizer in which a polarizer and a high hardness plastic film are integrated; And
And a 1/4 wavelength plate disposed below the linear polarizer,
The hard plastic film has scratches of 0 to 2 when the steel wool # 0000 is mounted on a friction tester and then reciprocated 400 times under a load of 500 g,
The high hardness plastic film comprises a support substrate; A first coating layer formed on the lower surface of said support substrate and having a first modulus of elasticity in the range of 300 to 1500 MPa as measured by ASTM D882; And a second coating layer formed on the upper surface of the supporting substrate and having a second modulus of elasticity in the range of 2000 to 3500 MPa as measured by ASTM D882,
The first coating layer and the second coating layer may be the same or different from each other, and may be 3 to 6 functional acrylate, polydimethyl siloxane-polymethyl methacrylate (PDMS-PMMA) block copolymer, polymethyl methacrylate-polybutadiene- polystyrene block copolymer having an elongation of 20% according to ASTM D638, and urethane acrylate polymer having an elongation of 170% according to ASTM D638; And a photoinitiator. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
delete delete delete delete delete The method according to claim 1,
Wherein the first coating layer and the second coating layer have the same or different thicknesses of 40 占 퐉 to 300 占 퐉 independently of each other.
The method according to claim 1,
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 Wherein the polarizer comprises at least one selected from the group consisting of polyimide (PEI), polyimide (PI), triacetylcellulose (TAC), methyl methacrylate, and fluorine resin.
The method according to claim 1,
Wherein said hard plastic film has a maximum distance of each edge or a distance of one side of the hard plastic film when it is placed on a plane after being exposed for 70 to 100 hours at a temperature of 50 to 90 DEG C and a humidity of 80 to 90% Wherein the value is 1.0 mm or less.
delete The method according to claim 1,
Wherein the circular polarizer has a pencil hardness of 7H to 9H under a load of 1 kg.
The method according to claim 1,
And a functional optical layer on the lower surface of the polarizer.
The method according to claim 1,
And a protective layer formed by curing the active energy ray-curable resin composition on the lower surface of the polarizer.
The method according to claim 1,
Wherein the circularly polarizing plate further comprises an adhesive layer under the polarizer.
The circular polarizer of claim 1; And
And a touch sensor disposed at an upper portion or a lower portion of the circular polarizer to recognize input information through a user's touch.
16. The method of claim 15,
Wherein the touch sensor is a capacitive, pressure sensitive or optical touch sensor.
A display panel; And
The display device according to claim 1, wherein the circular polarizer is disposed on an upper portion of the display panel.
18. The method of claim 17,
Wherein the display panel is a reflection type liquid crystal display panel or an OLED panel.
18. The method of claim 17,
Wherein the display device further comprises a touch sensor.
20. The method of claim 19,
Wherein the touch sensor is disposed between the display panel and the circular polarizer.
20. The method of claim 19,
Wherein the touch sensor is disposed on an upper portion of the circularly polarizing plate.
20. The method of claim 19,
Wherein the touch sensor is disposed on an upper portion of a lower substrate of the LCD panel.
The display device according to claim 19, which is used as a copyboard.

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