KR101794050B1 - Polarizing plate and image display device comprising the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate and an image display apparatus having the polarizing plate, and more particularly, An orientation film layer coated on one surface of the polarizer layer; And a cured liquid crystal layer formed on the orientation film layer. The present invention relates to a retarder-integrated polarizing plate having a simplified manufacturing process and a thinner viewing angle, and an image display device having the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate and an image display apparatus having the same, and more particularly, to a polarizing plate in which retarders are integrated and an image display apparatus having the same.

Generally, the three-dimensional image display technology utilizes binocular parallax, which is the largest factor for recognizing a three-dimensional image in a short distance.

The principle of binocular disparity is a method of capturing at least two stereoscopic image acquisition cameras on the left and right eyes of the viewer through the left and right eyes, respectively, at different angles, and then separating them and transmitting them to the eyes of the viewer. It is possible that both eyes of a human are able to accept objects from the retina at different angles and synthesize these two images in the cerebrum.

In many cases, a patterned retarder (phase difference film) is included in an image display apparatus such as a liquid crystal display capable of realizing a stereoscopic image. The patterned retarder realizes a stereoscopic image by configuring the optical axes of the respective pattern regions in different directions so that images transmitted to the left and right eyes of the viewer wearing polarized glasses are different.

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

However, in order to apply the patterned retarder to the image display device in order to realize the stereoscopic image, the pattern interval of the retarder and the pixel interval of the color filter must be matched to each other. Such a process is not easy, It causes the defect rate to increase.

An object of the present invention is to provide a retarder-integrated polarizer in which retarder is integrated with a polarizer.

It is another object of the present invention to provide a retarder-integrated polarizing plate capable of realizing an extended viewing angle and an image display apparatus having the same.

1. Polarizer layer; An orientation film layer coated on one surface of the polarizer layer; And a cured liquid crystal layer formed on the alignment film layer.

2. The polarizer according to 1 above, wherein the alignment film layer has a thickness of 400 to 2,000 nm.

3. The polarizing plate of 1 above, wherein the cured liquid crystal layer is cured in a first pattern and a second pattern having different optical axes.

4. The polarizing plate according to item 1 above, further comprising a surface treatment layer on the cured liquid crystal layer.

5. The polarizer according to item 1 above, wherein the polarizer of the polarizer layer is adsorbed on the stretched polymer film.

6. The polymer film according to item 5, wherein the polymer film is selected from the group consisting of a polyvinyl alcohol film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, a cellulose film and a partially- ; Dehydrated polyvinyl alcohol film; And a dehydrochloric acid-treated polyvinyl alcohol-based film.

7. (S1) applying a composition for forming an alignment film on one surface of a polarizer layer and drying to form an alignment layer; (S2) subjecting the surface of the alignment layer to an alignment treatment; (S3) applying a composition for forming a cured liquid crystal layer onto the alignment film layer subjected to the alignment treatment, and drying and curing the composition.

8. The process for producing a polarizing plate according to 7 above, wherein the drying in step (S1) is carried out at 30 to 60 占 폚.

9. The method for producing a polarizing plate according to 7 above, wherein the thickness of the alignment layer after drying in step (S1) is 400 to 2,000 nm.

10. The method of manufacturing a polarizing plate according to 7 above, wherein the alignment treatment in the step (S2) is performed so that the optical axis of the hardened liquid crystal layer formed on the alignment film layer has a first pattern and a second pattern different from each other.

11. The method of producing a polarizing plate according to 7 above, wherein the drying in step (S3) is carried out at 40 to 80 캜.

12. The method of producing a polarizing plate according to 7 above, further comprising a surface treatment layer on top of the cured liquid crystal layer.

13. An image display device comprising the polarizing plate of any one of 1 to 6 above.

The polarizer of the present invention can achieve a reduction in the defective rate in the manufacturing process, an improvement in productivity and a reduction in manufacturing cost by integrating the retarder into the polarizing plate.

The polarizer of the present invention can provide a combined film of a retarder and a polarizer that is thinned by integrating the retarder with the polarizer.

In the polarizing plate of the present invention, since the base film is not present between the polarizer and the retarder, the viewing angle can be enlarged.

Since the retarder integrated with the polarizing plate of the present invention is formed by coating directly on the polarizer layer, the angle formed by the absorption axis of the polarizer and the optical axis of the retarder can be more precisely controlled, and the circularly polarized light is improved.

Since the retarder-integrated polarizer of the present invention can be made thinner, it can be effectively used for an image display device having a short distance between a polarizer and a backlight.

1 is a cross-sectional view schematically showing a conventional bonding method of a retarder and a polarizing plate.
2 is a cross-sectional view schematically showing one embodiment of the retarder-integrated polarizer of the present invention.
3 is an optical microscope photograph of the retarder-integrated polarizer produced according to Example 1 of the present invention.

The present invention provides a polarizing element comprising: a polarizer layer; An orientation film layer coated on one surface of the polarizer layer; And a cured liquid crystal layer formed on the orientation film layer. The present invention relates to a retarder-integrated polarizer having a simplified manufacturing process and a thinner viewing angle, and an image display device having the same.

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

As shown in FIG. 1, conventionally, 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 shown in FIG. 2, the retarder-integrated polarizer 300 of the present invention has the orientation film layer 330 directly coated on one surface of the polarizer layer 350 And a hardened liquid crystal layer 320 is formed on the alignment layer 330. The polarizing plate and the retarder are integrated.

The orientation film layer 330 according to the present invention is formed by coating directly on the polarizer layer 350 without using any other bonding means. Therefore, it is possible to realize a thin film and to enlarge the viewing angle. In addition, since the angle between the absorption axis of the polarizer and the optical axis of the retarder can be more precisely controlled at the time of forming the alignment film layer 330, the circularly polarized light can be improved.

In addition, since the alignment film layer 330 of the present invention is directly coated on the polarizer layer 350, the alignment film used in the conventional retarder usually has a thickness of about 100 nm. Therefore, a sufficient thickness is secured . In this respect, it is preferable that the thickness of the alignment film layer 330 of the present invention is 400 to 2,000 nm.

The cured liquid crystal layer 320 according to the present invention can be used without limitation as the cured liquid crystal layer commonly used in the art. For example, the entirety of the cured liquid crystal layer 320 may have the same optical axis, or the optical axis may have a first pattern and a second pattern different from each other (patterned retarder).

If necessary, the surface treatment layer 310 is further provided on the cured liquid crystal layer 320 according to the present invention, so that various functions can be reinforced. Such a surface treatment layer 310 can be adopted without limitation as 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 as a separate film and adhered to the cured liquid crystal layer 320. Alternatively, the surface treatment layer 310 may be formed by applying a composition for forming a surface treatment layer to the cured liquid crystal layer 320, have. In terms of thinning, it is preferable that a composition for forming a surface treatment layer is applied to the cured liquid crystal layer 320 and then dried to form it.

The polarizer layer 350 to which the alignment film layer 330 is directly coated can be used without limitation of a 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.

Such a polyvinyl alcohol-based resin film is used as the original film of the 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 360 may be used as a layer for bonding the polarizer layer 350 to the transparent base film or the retarder 370 without any particular limitation. For example, water-based adhesives, organic adhesives, photo-curing adhesives, and the like can be used, but the present invention is not limited thereto.

In the polarizing plate 300 of the present invention, the transparent base film or retarder 370 is a layer having a function of protecting the polarizer 350 and, in some cases, a retardation function. As such a transparent substrate and retarder, the transparent base film and the retarder used in the art can be used without particular limitation.

As the transparent base film, a film superior in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, etc. may be used. More specifically, a transparent film such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, poly Ester type resin; Cellulose-based resins such as diacetylcellulose and triacetylcellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, cyclo- or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Polyether sulfone type resin; Sulfone based resin; Polyether sulfone type resin; Polyether ether ketone resin; A sulfided polyphenylene resin; Vinyl alcohol type resin; Vinylidene chloride resins; Vinyl butyral resin; Allylate series resin; Polyoxymethylene type resin; Epoxy resin, and the like, and a film composed of the blend of the thermoplastic resin may also be used. Further, a film made of a thermosetting resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone or a film made of an ultraviolet curable resin may 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 polarizing plate 300 of the present invention can be usefully used in an image display apparatus. The image display device to which the present invention is applicable is not limited to a specific one, but a liquid crystal display device, a inorganic / organic EL display device, a flexible display device, an LED, an FED, a VFD, a plasma display device, Can be used.

Hereinafter, one embodiment of the method for producing the retarder-integrated polarizing plate of the present invention will be described in detail.

First, a composition for forming an alignment film is applied to one surface of a polarizer layer and dried to form an alignment layer (S1).

In the polarizing plate 300 of the present invention, the orientation film layer 330 is formed from a composition for forming an orientation film as a layer for inducing the orientation of the curable liquid crystal in 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 which are conventionally used in the art.

As the alignment agent, an alignment agent commonly used in the art can be used without any particular limitation. For example, a polyacrylate-based polymer, a polyamic acid, a polyimide-based polymer, or a polymer containing a cinnamate group can be used as an alignment agent, and in the case of applying light alignment, a polymer containing a cinnamate group can be used. The polymer used as the aligning agent may have a weight average molecular weight of about 10,000 to 500,000, but is not limited thereto.

As the photoinitiator, photoinitiators conventionally used in the art can be used without any particular limitation. For example, a triazine-based compound, an acetophenone-based compound, a nonimidazole-based compound, an oxime-based compound, a benzoin-based compound, a benzophenone-based compound, a thioxanthone-based compound, an anthracene-based compound, no.

Examples of the styrenic compound include 2,4-bis (trichloromethyl) -6- (4-methoxyphenyl) -1,3,5-triazine, 2,4-bis (trichloromethyl) (Trichloromethyl) -6-piperonyl-1,3,5-triazine, 2,4-bis (trichloromethyl) Bis (trichloromethyl) -6- [2- (5-methylfuran-2-yl) -Yl) ethenyl] -1,3,5-triazine, 2,4-bis (trichloromethyl) -6- [2- (furan- Azine, 2,4-bis (trichloromethyl) -6- [2- (4-diethylamino-2-methylphenyl) ethenyl] -1,3,5-triazine, 2,4- Methyl) -6- [2- (3,4-dimethoxyphenyl) ethenyl] -1,3,5-triazine.

Examples of the acetophenone compound include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethylketal, 2- 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1- (2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane 1-one, 2-methyl-2-amino (4-morpholinophenyl) ethan- (4-morpholinophenyl) ethan-1-one, 2-methyl-2-amino (4 (4-morpholinophenyl) propane-1-one, 2-methyl-2- 1-one, 2-ethyl-2-amino (4-morpholinophenyl) butan- Propan-1-one, 2-methyl-2-dimethylamino (4-morpholinophenyl) Polynophenyl) propan-1-one, and the like.

Examples of the biimidazole-based compound include 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis -Dichlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis (2-chlorophenyl) -4,4' Imidazole, 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetra (trialkoxyphenyl) biimidazole, phenyl group at 4,4' An imidazole compound substituted by a haloalkoxy group, and the like. Of these, 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis (2,3- 5,5'-tetraphenylbiimidazole is preferably used.

As the oxime-based compound, 0-ethoxycarbonyl-α-oximino-1-phenylpropan-1-one and the like can be given.

Examples of the above benzotriene compound include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether and the like.

Examples of the above benzophenone compounds include benzophenone, methyl 0-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 3,3 ', 4,4'-tetra tert-butylperoxycarbonyl) benzophenone, 2,4,6-trimethylbenzophenone, and the like.

Examples of the thioxanthone compound include 2-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propanedioxanthone, etc. .

Examples of the anthracene compound include 9,10-dimethoxyanthracene, 2-ethyl-9,10-dimethoxyanthracene, 9,10-diethoxyanthracene, 2-ethyl-9,10-diethoxyanthracene, .

In addition to these, it is also possible to use 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 10-butyl-2-chloroacridone, 2-ethyl anthraquinone, benzyl, 9,10-phenanthrenequinone, camphorquinone, phenylclyoxylic acid Methyl, titanocene compounds, and photopolymerization initiators having a group capable of chain transfer described in JP-A No. 2002-544205.

As the organic solvent, an organic solvent commonly used in the art can 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; Examples of the solvent include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate, ethyl 2-hydroxypropionate, methylhydroxyacetate, , Hydroxybutyl acetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, methyl 3-hydroxypropionate, ethyl 3-hydroxypropionate, propyl 3-hydroxypropionate, butyl 3-hydroxypropionate, Methyl methoxyacetate, methyl methoxyacetate, methyl methoxyacetate, ethyl methoxyacetate, propyl methoxyacetate, butyl methoxyacetate, ethoxyacetate, ethoxyacetate, ethoxyacetate, ethoxyacetate, propoxy Methyl acetate, ethyl propoxyacetate, propoxypropylacetate, butyl propoxyacetate, methyl butoxyacetate, ethyl butoxyacetate, butyl Methoxypropionate, ethyl 2-methoxypropionate, butyl 2-methoxypropionate, methyl 2-ethoxypropionate, ethyl 2-ethoxypropionate, ethyl 2-ethoxypropionate, , Propyl 2-ethoxypropionate, butyl 2-ethoxypropionate, methyl 2-butoxypropionate, ethyl 2-butoxypropionate, propyl 2-butoxypropionate, butyl 2-butoxypropionate, Ethoxypropionate, propyl 3-ethoxypropionate, propyl 3-ethoxypropionate, butyl 3-ethoxypropionate, ethyl 3-methoxypropionate, propyl 3-methoxypropionate, butyl 3-methoxypropionate, Propoxy propionate, methyl 3-butoxypropionate, ethyl 3-butoxypropionate, 3-butoxypropionic acid ethyl, 3-propoxypropionate, 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 contain additives such as a filler, a curing agent, a leveling agent, an adhesion promoter, an antioxidant, an ultraviolet absorber, an aggregation inhibitor and a chain transfer agent.

The application of the composition for forming an alignment film can be carried out by any conventional coating method known in the art such as doctor blade, wire bar, die coater, comma coater, gravure coater, roll, etc. without limitation.

After the composition for forming an alignment film is applied to one surface of the polarizer layer 350, a drying process is performed. In this case, it is preferable that the polarizer is not sensitive to heat and therefore does not dry at a high temperature. If dried at high temperature, the polarizer may be cracked or curled. In this respect, the drying can be carried out at 60 ° C or lower, preferably 30 to 60 ° C, but is not limited thereto.

After the composition for forming an alignment film is dried, an orientation film layer is formed. The thickness after drying is preferably 400 to 2,000 nm as described above.

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

In order for the orientation film layer 330 to induce the orientation of the curable liquid crystal, an orientation treatment is performed on the surface on which the curable liquid crystal layer 320 is formed. Since the present invention is subjected to alignment treatment after the alignment film layer is attached to the polarizer, precise alignment treatment is possible. The alignment treatment can be carried out by various methods known in the art without limitation, and preferably, photo-curing can be used.

The alignment treatment may be performed so that the entirety of the cured liquid crystal layer 320 has the same optical axis, or the optical axis of the cured liquid crystal layer 320 may have a first pattern and a second pattern different from each other .

Next, a composition for forming a cured liquid crystal layer is coated on the alignment layer, and the cured liquid crystal layer is 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 which are commonly used in the art.

The liquid crystalline compounds react with each other to form a cured product. The liquid crystalline compound has a reactive group, and the reactive group includes, for example, 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. As the photopolymerization initiator, the photoinitiators exemplified above may be used. The 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 in accordance with the alignment direction of the liquid crystal. In the present invention, the alignment direction 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 directions of the optical axes have different first and second patterns, the different optical axes can be substantially orthogonal.

After the composition for forming a cured liquid crystal layer is applied to the alignment film layer 330, a drying process is performed. In this case, since the polarizer layer 350 is blocked by the alignment film layer 330, the alignment film layer 330 can be performed at a higher temperature than when the alignment film layer 330 is dried. For example, it may be carried out at 40 to 80 DEG C, but is not limited thereto.

In the present invention, if necessary, the liquid crystal layer may further include a surface treatment layer as described above on the cured liquid crystal layer. The step of providing the surface treatment layer may be performed by attaching a separate film to the polarizing plate 300 or may be performed by applying the composition for forming the surface treatment layer 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

(ROP108-EXP115, manufactured by Rolic Co.) was applied on the opposite side of the PVA polarizer, and hot-air drying was performed at 60 DEG C for 90 seconds to form an alignment layer having a thickness of 1,000 nm .

An alignment film oriented in a certain direction was formed by irradiating the alignment film with ultraviolet light polarized with a 14 mW exposure lamp. After the alignment layer was cured, a composition for forming a cured liquid crystal layer (RMS11-054, Merck) was applied, preliminarily dried at 50 DEG C for 30 seconds, and then dried at 70 DEG C for 60 seconds to form a 1.0 mu m thick liquid crystal layer , And then cured by ultraviolet rays for 60 seconds with a 14 mW exposure lamp to form a cured liquid crystal layer. Thereafter, a transparent substrate film coated with an anti-glare layer was adhered to the retarder using an adhesive to form a surface-treated layer, thereby producing a polarizer integrated with the retarder.

For reference, an optical microscope photograph of the prepared polarizing plate is shown in Fig.

Example  2

 A polarizing plate was prepared in the same manner as in Example 1, except that the coating solution for forming an antiglare layer was applied on a retarder, followed by drying and curing to form a surface treatment layer.

Example  3

A polarizing plate was prepared in the same manner as in Example 1, except that the composition for forming an orientation film was applied at a drying temperature of 70 ° C and a preliminary drying and drying temperature was 90 ° C after application of the composition for forming a cured liquid crystal layer.

Example  4

A polarizing plate was produced in the same manner as in Example 1, except that the thickness of the alignment layer after coating and drying the composition for forming an alignment film was 300 nm.

Comparative Example  One

A polarizer having a TAC substrate adhered on both sides of the PVA polarizer was prepared.

On the other hand, an alignment film layer was formed on the TAC substrate using the composition for forming an alignment film of Example 1, and a cured liquid crystal layer was formed thereon using the composition for forming a cured liquid crystal layer of Example 1 to prepare retarder.

The prepared retarder was adhered to one surface of the TAC substrate of the prepared polarizing plate using an adhesive.

Experimental Example

< Circular polarization degree >

In order to measure the circularly polarized light, the circularly polarized light was measured using a V7100 manufactured by Nippon Shoko KK, which is a polarization degree measuring instrument, and the results are shown in Table 1 below.

<Viewing Angle>

The viewing angle was measured by measuring the brightness according to the viewing angle in the black and white states of the 3D pattern using the viewing angle measuring apparatus Eldim Ez contrast. The results are shown in Table 1 below.

Evaluation items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Circular polarization degree 99.97% 99.97% 99.93% 99.95% 99.80% Viewing angle
(based on crosstalk 1%) 30 ° 30 ° 30 ° 30 ° 27

As shown in Table 1, it can be seen that the polarizing plate of the examples according to the present invention is significantly superior to the polarizing plate of the comparative example in terms of the plain luminous intensity and the viewing angle.

For reference, it can be seen that in Example 4, in which the drying temperature is rather high, and in Example 4, in which the thickness of the alignment layer is somewhat thin, the circularly polarized light is somewhat lower than in other Examples (Example 1 and Example 2).

Claims (13)

A polarizer layer;
An orientation film layer directly coated on one surface of the polarizer layer; And
A cured liquid crystal layer formed on the alignment film layer;
And a retarder integrally polarizer.
The polarizing plate according to claim 1, wherein the alignment film layer has a thickness of 400 to 2,000 nm.
The polarizing plate according to claim 1, wherein the cured liquid crystal layer is cured in a first pattern and a second pattern with different optical axes.
The polarizing plate according to claim 1, further comprising a surface treatment layer on the cured liquid crystal layer.
The polarizing plate according to claim 1, wherein the polarizer of the polarizer layer has the dichroic dye adsorbed on the stretched polymer film.
[7] The method of claim 5, wherein the polymer film is selected from the group consisting of a polyvinyl alcohol film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, a cellulose film and a partially saponified film thereof; Dehydrated polyvinyl alcohol film; And a dehydrochloric acid-treated polyvinyl alcohol-based film.
(S1) directly applying a composition for forming an alignment film on one side of the polarizer layer and drying to form an orientation film layer;
(S2) subjecting the surface of the alignment layer to an alignment treatment;
(S3) applying a composition for forming a cured liquid crystal layer on the alignment film layer subjected to the alignment treatment, drying and curing the composition;
Wherein the polarizer is a polarizer.
The method according to claim 7, wherein drying in step (S1) is performed at 30 to 60 캜.
The method of manufacturing a polarizing plate according to claim 7, wherein the thickness of the alignment film layer after drying in step (S1) is 400 to 2,000 nm.
[7] The method according to claim 7, wherein the alignment treatment in the step (S2) is performed so that the optical axis of the cured liquid crystal layer formed on the alignment film layer has a first pattern and a second pattern different from each other.
[9] The method of claim 7, wherein the drying in step (S3) is performed at 40 to 80 [deg.] C.
The method of claim 7, further comprising the step of providing a surface treatment layer on top of the cured liquid crystal layer.
An image display device comprising the polarizing plate of any one of claims 1 to 6.

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