KR20130106633A - Polarizing plate and image display device comprising the same - Google Patents

Abstract

PURPOSE: A polarizing plate and an image display device including the same are provided to improve a circular polarization by directly coating a transparent base film with a retarder. CONSTITUTION: A polarizing film includes a polarizer layer (350) and a transparent base film (340). The transparent base film is attached to one side of the polarizer layer. An orientation film layer (330) is coated on the surface of the transparent base film which is opposite to the surface with the polarizer layer. A hardening liquid crystal layer (320) is formed on the orientation film layer. A surface processing layer (310) is formed on the upper side of the hardening liquid crystal layer. [Reference numerals] (310) Surface processing layer; (320) Hardening liquid crystal layer; (330) Orientation film layer; (340) Transparent base film; (350) Polarizer layer; (360a,360b) Adhesion layer; (370) Transparent film or retarder

Description

POLARIZING PLATE AND IMAGE DISPLAY DEVICE COMPRISING THE SAME}

The present invention relates to a polarizing plate and an image display device having the same, and more particularly, to a polarizing plate integrated with a retarder and an image display device having the same.

In general, three-dimensional image display technology uses a binocular parallax, which is the biggest factor for recognizing three-dimensional effect at a close range.

The principle of binocular parallax is a method of photographing a left eye image viewed through a left eye and a right eye image viewed through a right eye from at least two stereoscopic image capturing cameras, and then separating and transmitting them to the viewer's eyes. This is possible because two human eyes receive objects through the retina from different angles and these two images are synthesized in the cerebrum.

Image display apparatuses, such as liquid crystal displays, which can realize stereoscopic images, often include a patterned retarder (retardation film). The patterned retarder implements a three-dimensional image by configuring the optical axis of each pattern region in different directions so that the image transmitted to the left and right eyes of a viewer wearing polarized glasses is different.

1 schematically illustrates a conventional application method of a patterned retarder, wherein the patterned retarder 100 is adhered onto the upper polarizer 200 through which light passing through the color filter layer passes.

However, in order to apply a patterned retarder to an image display device to realize a stereoscopic image, the patterned retarder and the pixel interval of the color filter should be adhered to each other. It causes the failure rate to increase.

An object of this invention is to provide the retarder integrated polarizing plate which integrated the retarder in the polarizing plate.

In addition, an object of the present invention is to provide a retarder-integrated polarizing plate that can implement an improved circular polarization degree and an image display device having the same.

One. A polarizing film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer; An alignment layer layer coated on a surface opposite to a surface on which a polarizer layer of the transparent substrate film is formed; And a cured liquid crystal layer formed on the alignment layer. Retarder integrated polarizing plate provided with.

2. In the above 1, the alignment layer is 50 to 150 nm thick polarizing plate.

3. In the above 1, the cured liquid crystal layer is a polarizing plate cured in a first pattern and a second pattern different from the optical axis.

4. In the above 1, the polarizing plate further comprising a surface treatment layer on the cured liquid crystal layer.

5. The polarizer of claim 1, wherein the polarizer of the polarizer layer is a dichroic dye adsorbed on the stretched polymer film.

6. In the above 5, the polymer film is any one selected from the group consisting of polyvinyl alcohol-based film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, cellulose film and their partially saponified film ; Dehydrated polyvinyl alcohol-based film; And a polyvinyl alcohol-based film treated with dehydrochloric acid.

7. (S1) After preparing a polarizing film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer, and applying the composition for forming an alignment film on the opposite side of the surface on which the polarizer layer of the transparent base film is formed and Drying to form an alignment layer; (S2) aligning the alignment film layer; And (S3) applying a composition for forming a cured liquid crystal layer on the alignment-treated alignment layer, drying, and curing the dried liquid crystal layer.

8. In the above 7, the drying of the step (S1) is carried out at 40 to 80 ℃ manufacturing method of a polarizing plate.

9. In the above 7, the thickness of the alignment layer layer after the drying of the step (S1) is 50 to 150nm of the manufacturing method of the polarizing plate.

10. In the above 7, the alignment process of step (S2) is a method of manufacturing a polarizing plate is performed so that the optical axis of the cured liquid crystal layer formed on the alignment layer has a different first pattern and second pattern.

11. In the above 7, the drying of the step (S3) is carried out at 60 to 100 ℃ manufacturing method of a polarizing plate.

12. In the above 7, the method of manufacturing a polarizing plate comprising the step of further comprising a surface treatment layer on top of the cured liquid crystal layer.

13. Image display device having a polarizing plate of any one of 1 to 6.

In the polarizing plate of the present invention, the retarder is integrated into the polarizing plate, thereby reducing the defective rate in the manufacturing process, and improving the productivity and reducing the manufacturing cost.

The polarizing plate of the present invention may provide a composite film of a thinner retarder and a polarizing plate by incorporating a retarder into a polarizing plate.

Since the retarder integrated in the polarizing plate of the present invention is directly coated on the transparent base film of the polarizing plate, the retarder can be more precisely controlled to form an angle between the absorption axis of the polarizer and the optical axis of the retarder, thereby improving circular polarization.

Since the retarder integrated polarizer of the present invention can be thinned, the retarder integrated polarizer can be effectively used in an image display device having a short distance between the polarizer and the backlight.

1 is a cross-sectional view schematically showing a bonding method of a conventional retarder and a polarizing plate.
2 is a cross-sectional view schematically showing an embodiment of the retarder integrated polarizer of the present invention.

The present invention, a polarizer film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer; An alignment layer layer coated on a surface opposite to a surface on which a polarizer layer of the transparent substrate film is formed; And a cured liquid crystal layer formed on the alignment layer, and a retarder-integrated polarizing plate capable of thinning and improved circular polarization, and an image display device having the same.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, in the related art, the polarizer 200 and the retarder 100 are separately manufactured and then bonded using an adhesive or the like.

However, as shown in one embodiment of the polarizing plate of the present invention schematically illustrated in FIG. 2, the retarder integrated polarizing plate 300 of the present invention is the other side of the transparent base film 340 to which the polarizer layer 350 is attached. The alignment layer 330 is directly coated, and the cured liquid crystal layer 320 is formed on the alignment layer 330, and is a thin film, in which a polarizer and a retarder are integrated.

Since the alignment layer 330 according to the present invention is formed by directly coating the transparent base film 340 without using other adhesive means, the absorption axis of the polarizer and the optical axis of the retarder are formed when the alignment layer 330 is formed. Since the angle can be adjusted more precisely, circular polarization can be improved. It is preferable that the thickness of the oriented film layer 330 of this invention is 50-150 nm.

Cured liquid crystal layer 320 according to the present invention may be used without limitation the cured liquid crystal layer commonly used in the art. For example, the entire cured liquid crystal layer 320 may have the same optical axis, or may have a first pattern and a second pattern having different optical axes (patterned retarder).

If necessary, by further providing a surface treatment layer 310 on the cured liquid crystal layer 320 according to the present invention, it is possible to reinforce various functions. The surface treatment layer 310 may be adopted without limitation various functional layers used in the art. For example, an anti-fog layer, an anti-glare layer, and the like, but are not limited thereto. The surface treatment layer 310 may be formed of a separate film and then bonded to the cured liquid crystal layer 320, or may be formed by applying the surface treatment layer forming composition to the cured liquid crystal layer 320 and then drying. have. In terms of thinning, it is preferable that the composition for forming the surface treatment layer is applied to the cured liquid crystal layer 320 and then dried to form it.

The transparent base film 340 to which the alignment layer 330 is directly coated is preferably 20 to 60 μm in thickness. As a material of the transparent base film 340, a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy, etc. may be used. More specifically, polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene Polyester-based resins such as terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether sulfone resin; Polyether ether ketone resin; A sulfided polyphenylene resin; Vinyl alcohol-based resins; Vinylidene chloride-based resins; Vinyl butyral resin; Allyl resins; Polyoxymethylene resin; And films composed of thermoplastic resins such as epoxy resins, and the like, and films composed of blends of the above thermoplastic resins may also be used. Moreover, the film of thermosetting resin or ultraviolet curable resin, such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, and silicone type, can also be used.

Among these films, films that are more commonly used include films of TAC (triacetyl cellulose), cyclo-olefin polymer (COP), and poly (methyl methacrylate) polymers.

The polarizer layer 350 is attached to the other surface of the transparent base film 340. The attachment may be performed by forming the adhesive layer 360a using a conventional adhesive or the like. Specific examples of the adhesive may include, but are not limited to, an aqueous adhesive, an organic adhesive, a photocurable adhesive, and the like.

The polarizer layer 350 may be used without limitation to the polarizer used in the art. A commonly used polarizer is one in which a dichroic dye is adsorbed and oriented on a stretched polymer film.

 The polymer film constituting the polarizer is not particularly limited as long as it is a film which can be dyed with a dichroic substance such as iodine. Specifically, the polymer film may be a polyvinyl alcohol film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film , Cellulose films, partially saponified films thereof, and the like; Or a dehydrated polyvinyl alcohol film, a dehydrochloric acid-treated polyvinyl alcohol film, and the like. Of these, a polyvinyl alcohol-based film is preferable because it has an excellent effect of enhancing the uniformity of the degree of polarization in the plane and is excellent in dye affinity for a dichroic substance.

More preferably, it may be a polyvinyl alcohol-based film obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Other monomers copolymerizable with vinyl acetate include acrylamide monomers having an unsaturated carboxylic acid type, an unsaturated sulfonic acid type, an olefin type, a vinyl ether type, and an ammonium group. The polyvinyl alcohol resin may also be modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The saponification degree of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polymerization degree of the polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.

What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of a polarizer. The method of forming the film of the polyvinyl alcohol-based resin is not particularly limited, and a known method can be used. The thickness of the original film is not particularly limited, and may be, for example, 10 to 150 mu m.

The polarizer is usually produced by a process of uniaxially stretching a polyvinyl alcohol film as described above, dyeing with a dichroic dye and adsorbing, treating with an aqueous solution of boric acid, and washing and drying. The thickness of the polarizer produced as described above is preferably 5 to 40 mu m.

In the polarizing plate 300 of the present invention, the adhesive layer 360b is a layer for bonding the polarizer layer 350 to the transparent base film or the retarder 370, and the same adhesive that may be used for the adhesive layer 360a described above may be used. Can be.

In the polarizing plate 300 of the present invention, the transparent base film or the retarder 370 is a layer having a function of protecting the polarizer 350 and, in some cases, even a phase difference function. As the transparent substrate and the retarder, the above-described transparent substrate and retarder used in the art may be used without particular limitation.

The polarizing plate 300 of the present invention can be usefully used in an image display device. The image display device to which the present invention is applicable is not limited to a specific one, but a liquid crystal display device, an inorganic / organic EL display device, a flexible display device, an LED, a FED, a VFD, a plasma display device, Can be used.

Hereinafter, an embodiment of the manufacturing method of the retarder integrated polarizing plate of the present invention will be described in detail.

First, a polarizing film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer is prepared, and then the composition for forming an alignment film is coated on the opposite side of the surface on which the polarizer layer of the transparent base film is formed and dried to form an alignment film. Form a layer (S1).

In the polarizing plate 300 of the present invention, the alignment film layer 330 is formed of a composition for forming an alignment film as a layer for inducing alignment of the curable liquid crystal of the cured liquid crystal layer 320.

The composition for forming an alignment film according to the present invention may include an alignment agent, a photoinitiator and an organic solvent commonly used in the art.

As the alignment agent, an alignment agent conventionally used in the art may be used without particular limitation. For example, a polyacrylate-based polymer, a polyamic acid, a polyimide-based polymer, or a polymer containing cinnamate groups can be used as the alignment agent, and when a photoalignment is applied, a polymer containing cinnamate groups can be used. The polymer used as the alignment agent may have a weight average molecular weight of about 10,000-500,000, but is not limited thereto.

As the photoinitiator, photoinitiators conventionally used in the art may be used without particular limitation. For example, a triazine compound, an acetophenone compound, a biimidazole compound, an oxime compound, a benzoin compound, a benzophenone compound, a thioxanthone compound, an anthracene compound, etc. may be used, but is not limited thereto. no.

As the above triazine-based compound, for example, 2,4-bis (trichloromethyl) -6- (4-methoxyphenyl) -1,3,5-triazine, 2,4-bis (trichloromethyl)- 6- (4-methoxynaphthyl) -1,3,5-triazine, 2,4-bis (trichloromethyl) -6-piperonyl-1,3,5-triazine, 2,4- Bis (trichloromethyl) -6- (4-methoxystyryl) -1,3,5-triazine, 2,4-bis (trichloromethyl) -6- [2- (5-methylfuran-2 -Yl) ethenyl] -1,3,5-triazine, 2,4-bis (trichloromethyl) -6- [2- (furan-2-yl) ethenyl] -1,3,5-tri Azine, 2,4-bis (trichloromethyl) -6- [2- (4-diethylamino-2-methylphenyl) ethenyl] -1,3,5-triazine, 2,4-bis (trichloro Methyl) -6- [2- (3,4-dimethoxyphenyl) ethenyl] -1,3,5-triazine and the like.

As the acetophenone-based compound, for example, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyl dimethyl ketal, 2-hydroxy-1- [4- (2 -Hydroxyethoxy) phenyl] -2-methylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1- On, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, 2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane Oligomer of -1-one, 2-methyl-2-amino (4-morpholinophenyl) ethan-1-one, 2-ethyl-2-amino (4-morpholinophenyl) ethan-1-one, 2 -Propyl-2-amino (4-morpholinophenyl) ethan-1-one, 2-butyl-2-amino (4-morpholinophenyl) ethan-1-one, 2-methyl-2-amino (4 -Morpholinophenyl) propane-1-one, 2-methyl-2-amino (4-morpholinophenyl) butan-1-one, 2-ethyl-2-amino (4-morpholinophenyl) propane- 1-one, 2-ethyl-2-amino (4-morpholinophenyl) butan-1-one, 2-methyl-2-meth Amino (4-morpholinophenyl) propane-1-one, 2-methyl-2-dimethylamino (4-morpholinophenyl) propane-1-one, 2-methyl-2-diethylamino (4-mor Polynophenyl) propan-1-one etc. are mentioned.

As the biimidazole-based compound, for example, 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis (2,3 -Dichlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis (2-chlorophenyl) -4,4', 5,5'-tetra (alkoxyphenyl) ratio Imidazole, 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetra (trialkoxyphenyl) biimidazole, phenyl group at 4,4', 5,5 'position And imidazole compounds substituted with a boalkoxy group. Among these, 2,2'bis (2-chlorophenyl) -4,4 ', 5,5'-tetra phenylbiimidazole, 2,2'-bis (2,3-dichlorophenyl) -4,4', 5,5'-tetraphenylbiimidazole is preferably used.

Examples of the above oxime compounds include 0-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one and the like.

As said benzoin type compound, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, etc. are mentioned, for example.

As the above benzophenone-based compound, for example, benzophenone, methyl 0-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, 3,3 ', 4,4'-tetra ( tert-butylperoxycarbonyl) benzophenone, 2,4,6-trimethylbenzophenone, etc. are mentioned.

Examples of the thioxanthone-based compound include 2-isopropyl thioxanthone, 2,4-diethyl thioxanthone, 2,4-dichloro thioxanthone, 1-chloro-4-propoxy thioxanthone, and the like. Can be mentioned.

Examples of the anthracene-based compound include 9,10-dimethoxyanthracene, 2-ethyl-9,10-dimethoxyanthracene, 9,10-diethoxyanthracene, 2-ethyl-9,10-diethoxyanthracene, and the like. Can be mentioned.

In addition, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 10-butyl-2-chloroacridone, 2-ethylanthraquinone, benzyl, 9,10-phenanthrenequinone, camphorquinone, phenylclioxylic acid Methyl, a titanocene compound, the photoinitiator which has group which can cause the chain transfer described in Unexamined-Japanese-Patent No. 2002-544205, etc. are mentioned.

As the organic solvent, an organic solvent conventionally used in the art may be used without particular limitation. Ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether and ethylene glycol monobutyl ether; Diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol dipropyl ether and diethylene glycol dibutyl ether; Ethylene glycol alkyl ether acetates such as methyl cellosolve acetate, ethyl cellosolve acetate, ethylene glycol monobutyl ether acetate and ethylene glycol monoethyl ether acetate; Alkylene glycol alkyl ether acetates such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxypentyl acetate; Propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether and propylene glycol monobutyl ether; Propylene glycol dialkyl ethers such as propylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol ethyl methyl ether, propylene glycol dipropyl ether, propylene glycol propyl methyl ether and propylene glycol ethyl propyl ether; Propylene glycol alkyl ether propionates such as propylene glycol methyl ether propionate, propylene glycol ethyl ether propionate, propylene glycol propyl ether propionate and propylene glycol butyl ether propionate; Butyldiol monoalkyl ethers such as methoxybutyl alcohol, ethoxybutyl alcohol, propoxybutyl alcohol and butoxybutyl alcohol; Butanediol monoalkyl ether acetates such as methoxybutyl acetate, ethoxybutyl acetate, propoxybutyl acetate and butoxybutyl acetate; Butanediol monoalkyl ether propionates such as methoxy butyl propionate, ethoxy butyl propionate, propoxy butyl propionate and butoxy butyl propionate; Dipropylene glycol dialkyl ethers such as dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether and dipropylene glycol methyl ethyl ether; Aromatic hydrocarbons such as benzene, toluene, xylene and mesitylene; Ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone; Alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol and glycerin; Methyl acetate, ethyl acetate, propyl acetate, butyl acetate, 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate, 2-hydroxy-2-methylpropionate, methyl hydroxyacetate, ethyl hydroxyacetate , Butyl hydroxy acetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, 3-hydroxypropionate methyl, 3-hydroxypropionate ethyl, 3-hydroxypropionate propyl, 3-hydroxypropionate butyl, 2-hydroxy 3-Methyl methyl butyrate, methyl methoxy acetate, ethyl methoxy acetate, methoxy acetate propyl, butyl acetate, ethoxy acetate methyl, ethoxy acetate, ethoxy acetate propyl, butyl ethoxy acetate, propoxy Methyl acetate, ethyl propoxy acetate, propyl propoxy acetate, butyl propoxy acetate, methyl butoxy acetate, ethyl butoxy acetate, Propyl acetate, butyl butoxy acetate, methyl 2-methoxypropionate, 2-methoxy ethylpropionate, propyl 2-methoxypropionate, butyl 2-methoxypropionate, methyl 2-ethoxypropionate, ethyl 2-ethoxypropionate Propyl 2-ethoxypropionate, butyl 2-ethoxypropionate, methyl 2-butoxypropionate, ethyl 2-butoxypropionate, propyl 2-butoxypropionate, butyl 2-butoxypropionate, methyl 3-methoxypropionate, 3-methoxy ethylpropionate, 3-methoxy propylpropionate, 3-methoxy propylpropionate, 3-ethoxy propylpropionate, 3-ethoxy propylpropionate, 3-ethoxy propylpropionate, 3-ethoxy propylpropionate, 3 Methyl propoxypropionate, 3-propoxy propionate, 3-propoxypropionate, butyl 3-propoxypropionate, methyl 3-butoxypropionate, ethyl 3-butoxypropionate, 3-butoxypropionic acid Esters such as ropil, 3-butoxy-propionic acid butyl; Cyclic ethers such as tetrahydrofuran and pyran; and cyclic esters such as? -butyrolactone, which may be used alone or in admixture of two or more.

The composition for forming an alignment film of the present invention may further include additives such as fillers, curing agents, leveling agents, adhesion promoters, antioxidants, ultraviolet absorbers, anti-aggregation agents, chain transfer agents and the like, as necessary.

Application of the composition for forming an alignment film can be used without limitation, for example, conventional coating methods known in the art, such as a doctor blade, a wire bar, a die coater, a comma coater, a gravure coater, a roll.

After the composition for forming the alignment layer is applied to one surface of the transparent base film 340, a drying process is performed. In this case, since a polarizer is weak to heat, it is preferable not to dry at high temperature. Drying at high temperatures may cause changes in optical properties (transmittance, polarization and color) of the polarizer. In this aspect, drying may be performed at 80 ° C. or less, preferably 30 to 80 ° C., more preferably 40 to 80 ° C., but is not limited thereto.

After the composition for forming the alignment film is dried, an alignment film layer is formed, and after drying, the thickness thereof is preferably 50 to 150 nm.

Next, an alignment treatment is performed on the alignment film layer surface (S2).

In order for the alignment layer 330 to induce alignment of the curable liquid crystal, an alignment process is performed on the surface on which the cured liquid crystal layer 320 is formed. In the present invention, since the alignment treatment is performed after attaching the alignment layer to the polarizer, precise alignment treatment is possible. Orientation treatment can employ various methods known in the art without limitation, preferably photocuring can be used.

If necessary, the alignment process may be performed so that the entire cured liquid crystal layer 320 may have the same optical axis, or the optical axes of the cured liquid crystal layer 320 may have different first and second patterns. .

Next, the cured liquid crystal layer-forming composition is applied onto the alignment-treated alignment layer and dried and cured (S3).

The composition for forming a cured liquid crystal layer may include a liquid crystal compound, a polymerization initiator, and an organic solvent commonly used in the art.

The liquid crystalline compounds react with each other to form a cured product. The liquid crystal compound has a reactive group, and examples thereof include a carbon-carbon unsaturated bond.

As the polymerization initiator, a photopolymerization initiator or a thermal polymerization initiator commonly used in the art may be used, and the photoinitiator exemplified above may be used as the photopolymerization initiator. An organic solvent may also be appropriately selected from among the organic solvents exemplified above.

The cured liquid crystal layer 330 has a phase difference function according to the alignment direction of the liquid crystal. In the present invention, all the alignment directions of the cured liquid crystal layer 330 may be the same or may include a first pattern and a second pattern having different optical axis directions. When the first and second patterns having different directions of optical axes are provided, the different optical axes may be substantially orthogonal to each other.

After the cured liquid crystal layer forming composition is applied to the alignment layer 330, a drying process is performed. The drying temperature may be performed at a temperature slightly higher than the drying temperature of the alignment layer 330. For example, it may be performed at 60 to 100 ° C, preferably 80 to 100 ° C, but is not limited thereto.

In the present invention, the method may further include providing the surface treatment layer described above on the upper portion of the liquid crystal layer cured as necessary. The providing step of the surface treatment layer may be performed by a process of adhering a separate film to the polarizing plate 300 of the present invention, or may be performed by applying a surface treatment layer forming composition to the polarizing plate 300 and then drying. have.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Example  One

Apply a composition for forming an acrylate-based alignment layer (ROP108-EXP115, Rolic) on the opposite side of the surface of the TAC substrate (thickness: 40 μm) to which the PVA polarizer is bonded, and then dry the hot air at 60 ° C. for 120 seconds. To form an alignment film layer having a thickness of 100 nm.

Ultraviolet light polarized with a 14mW exposure lamp was irradiated on the alignment layer to form an alignment layer aligned in a predetermined direction. After curing of the alignment layer was performed, a cured liquid crystal layer forming composition (RMS11-054, Merck Co., Ltd.) was applied, preliminarily dried at 80 ° C. for 20 seconds, and then dried at 100 ° C. for 60 seconds to form a liquid crystal layer having a thickness of 1.0 μm. Then, the film was cured with ultraviolet light for 500 seconds with a 14mW exposure lamp to form a cured liquid crystal layer. Thereafter, a coating solution for forming an antiglare layer was applied on a retarder, dried, and cured to form a surface treatment layer, thereby preparing a polarizing plate in which the retarder was integrated.

Example  2

A polarizing plate in which a retarder was integrated was manufactured in the same manner as in Example 1 except that the drying temperature after coating of the composition for forming an alignment film was 35 ° C.

Example  3

A polarizing plate in which a retarder was integrated was produced in the same manner as in Example 1 except that the thickness of the alignment film layer after coating and drying the composition for forming an alignment film was set to 500 nm.

Example  4

A polarizing plate in which a retarder was integrated was manufactured in the same manner as in Example 1 except that the TAC base material to which the composition for forming the alignment film was applied was used having a thickness of 100 μm.

Comparative Example  One

A polarizing film (see 200 in FIG. 1) having a TAC substrate adhered to both surfaces of a PVA polarizer was prepared.

On the other hand, an alignment film layer is formed on another new TAC substrate using the composition for forming an alignment film of Example 1, and a cured liquid crystal layer is formed thereon using the composition for curing liquid crystal layer formation of Example 1 on the retarder (FIG. 1). 100).

The prepared retarder was bonded to one surface of the TAC substrate of the prepared polarizing film using an adhesive to prepare a polarizing plate (see the right side of the arrow in FIG. 1).

Experimental Example

< PVA Absorption axis  Of the optical axis of the pattern Orientation angle >

Using the WAKE-100L equipment of Lukeo Co., Ltd., the alignment angles of A and B Patterns of the prepared polarizing plates were measured, and the results are shown in Table 1 below.

< Circular polarization >

In order to measure the circular polarization, circular polarization was measured using a polarization measurement instrument, Japan Spectroscope V7100, and the results are shown in Table 1 below.

<Viewing angle>

The viewing angle was measured by measuring the luminance according to the viewing angle in the black and white state of the 3D pattern using Eldim's Ez contrast, a viewing angle measuring device, and the results are shown in Table 1 below.

Evaluation item Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Orientation angle A pattern 45.13 45.19 45.17 45.15 45.51 B pattern 135.14 135.21 135.16 135.16 134.60 Circular polarization 99.95 99.91 99.88 99.95 99.87 Viewing angle 28 ° 28 ° 28 ° 27 ° 27 °

As described in Table 1, the polarizing plates of the embodiments according to the present invention can be seen that the error of the alignment angle is smaller than the polarizing plate of the comparative example, the circular polarization is also excellent. In addition, it turns out that circular polarization value is remarkably superior to a comparative example.

In addition, Example 2 in which the drying temperature is slightly outside the preferred range of the present invention and Example 3 having a thicker thickness of the alignment layer were slightly lower than those of Example 1 in terms of the orientation angle and circular polarization, and Example 4 having a thick TAC substrate was used. It can be seen that the orientation angle and the viewing angle are somewhat reduced.

Claims (13)

A polarizing film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer;
An alignment layer layer coated on a surface opposite to a surface on which a polarizer layer of the transparent substrate film is formed; And
A cured liquid crystal layer formed on the alignment layer;
Retarder integrated polarizing plate provided with.
The polarizing plate of claim 1, wherein the transparent base film coated with the alignment layer has a thickness of 20 μm to 60 μm.
The polarizing plate of claim 1, wherein the cured liquid crystal layer is cured in a first pattern and a second pattern having different optical axes.
The polarizing plate according to claim 1, further comprising a surface treatment layer on the cured liquid crystal layer.
The polarizer of claim 1, wherein the polarizer of the polarizer layer is a dichroic dye adsorbed onto the stretched polymer film.
The method according to claim 5, wherein the polymer film is any one selected from the group consisting of polyvinyl alcohol-based film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, cellulose film and their partially gumified film; Dehydrated polyvinyl alcohol-based film; And a polyvinyl alcohol-based film treated with dehydrochloric acid.
(S1) preparing a polarizing film having a polarizer layer and a transparent base film attached to at least one surface of the polarizer layer, and then applying and drying the composition for forming an alignment film on the side opposite to the surface on which the polarizer layer of the transparent base film is formed. Forming an alignment layer;
(S2) aligning the alignment film layer; And
(S3) coating the cured liquid crystal layer-forming composition on the alignment-oriented film layer, drying and curing;
Method of manufacturing a retarder integrated polarizing plate comprising a.
The method of claim 7, wherein the drying of the step (S1) is performed at 40 to 80 ℃.
The method of manufacturing a polarizing plate according to claim 7, wherein the transparent base film coated with the alignment layer in step (S1) has a thickness of 20 to 60 μm.
The method of claim 7, wherein the alignment treatment of step (S2) is performed such that optical axes of the cured liquid crystal layer formed on the alignment layer have different first and second patterns.
The method of claim 7, wherein the drying of the step (S3) is carried out at 60 to 100 ℃.
The method of claim 7, further comprising providing a surface treatment layer on the cured liquid crystal layer.
An image display apparatus provided with the polarizing plate of any one of Claims 1-6.

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