KR100738320B1 - Method for manufacturing optical devices having compensation film for ips mode using anstistatic alignment layer and optical devices having compensation film for ips mode using thereof - Google Patents

Abstract

A method for manufacturing an optical device having a compensation film for an IPS(In-Plane Switch) mode and an optical device manufactured by the method are provided to form an orientation film having antistatic function on a transparent supporter surface of a polarization film and coating the film with nematic liquid crystal for using the orientation film as a +C-plate compensation and antistatic film. A method for manufacturing an optical device having a compensation film(200) for an IPS mode includes the steps of preparing a polarization film finished in a continuous rotation coating machine as a base film and forming an orientation film(400) on a transparent supporter surface(300) of the polarization film through coating, drying, curing and rubbing the orientation film, and coating, drying and curing nematic liquid crystal on the rubbed orientation film.

Description

Method for manufacturing optical devices having compensation film for IPS mode using anstistatic alignment layer and optical devices having compensation film for IPS mode using pretty}

1 is a structural diagram showing a state in which an optical device having an IPS compensation film using an antistatic alignment film according to an embodiment of the present invention attached to an LDC cell;

2 is a graph showing a change in phase difference according to an inclination angle with respect to a phase axis of an optical device obtained in Embodiment 1 of the present invention;

3 is a graph showing a phase difference change according to an inclination angle with respect to a phase axis of an optical device obtained in Example 2 of the present invention;

4 is a graph showing a phase difference change according to an inclination angle with respect to a phase axis of an optical device obtained in Embodiment 3 of the present invention;

5 is a graph illustrating a change in phase difference according to an inclination angle with respect to a phase axis of an optical device used in Comparative Example 1;

6 is a graph showing the transmittance of the optical device obtained in Example 1 of the present invention;

7 is a graph showing the transmittance of an optical device obtained in Example 2 of the present invention;

8 is a graph showing the transmittance of an optical device obtained in Example 3 of the present invention;

9 is a graph showing the transmittance of the optical device obtained in Comparative Example 1. FIG.

Explanation of symbols on the main parts of the drawings

100, 300: transparent support 200: polarizer

400: antistatic alignment film 500: liquid crystal layer

600: adhesive 700: IPS LCD cell

The present invention relates to a method for manufacturing an optical device having an IPS compensation film using an antistatic alignment film, and an optical device manufactured by the method, and particularly, to an in-plane switch (IPS) liquid crystal display (IPS). After coating the alignment film imparted with the antistatic function on the surface of the polarizing film completed in the continuous rotation coating machine with an optical device, the optical film having an IPS compensation film using an antistatic alignment film coated with a nematic liquid crystal having a vertical alignment The present invention relates to a device manufacturing method and an optical device manufactured by the method.

In general, a liquid crystal flat panel display can be driven by a battery for several hours due to low power consumption compared to a Cathode Ray Tube (CRT) display, and a small space occupies a small space and is light in weight because of its low power consumption. The prevalence is rapidly spreading for reasons such as ease. In addition, the size of the product is increasing from small to large-sized display devices such as computer monitors and TVs. In particular, in the case of medium and large sized liquid crystal displays, it is important to secure the quality of a competitive display when it has a clear image quality at a wide viewing angle and improves the brightness contrast when the driving cell is turned on and off.

For this reason, various liquid crystals such as Dual Domain TN, Asymmetrically Aligned Microcell (ASM), Vertical Alignment (VA), Surrounding Electrode (SE), Patterned VA (PVA), and In-Plane Switching (IPS) modes. Mode displays are being developed. Each of these modes has a unique liquid crystal array and has inherent optical anisotropy. Therefore, in order to compensate for the change in the optical axis of linearly polarized light due to the optical anisotropy of these liquid crystal modes, various optical anisotropy compensation films are required.

The compensation film is important not only for optical compensation due to liquid crystal which is an optical anisotropic body, but also for compensating light leakage occurring at an optical viewing angle near 45 DEG from the optical axis of the orthogonal polarizing element, a compensation film having optical anisotropy is important. Therefore, it is important to develop an optical film capable of precisely and effectively controlling optical anisotropy for optical compensation of liquid crystal displays in various modes.

Optical anisotropy can be divided into Re, which is an in-plane retardation value, and Rth, which is a retardation value in the z-axis direction.

According to the prior art, in order to compensate for the IPS mode (LCD) LCD, a + C-plate compensation film mainly prepared by a stretching method was attached to the polarizing film.

However, it is difficult to implement the + C-plate function of the polarizing film with the + C-plate compensation film prepared by the stretching method. In addition, there is a problem in that the complexity and yield of the process, resulting in increased thickness.

In addition, there was a problem that the process caused by the adsorption and static electricity of the foreign matter by the friction generated during the rubbing process.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, an object of the present invention is to form an alignment film imparted with an antistatic function on the transparent support surface of the polarizing film in a continuous rotary coating machine and the nematic liquid crystal The present invention provides a method for manufacturing an optical device having a compensation film for IPS using an antistatic alignment film formed of a thin film while functioning as a + C-plate compensation film, and an optical device manufactured by the method.

In addition, another object of the present invention is to add an antistatic function to the alignment layer, thereby effectively removing foreign substances and static electricity generated during rubbing.

In addition, another object of the present invention is to form a liquid crystal layer uniformly by using a spin coating method.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail centering on a technical structure.

In the method of manufacturing an optical device having an IPS compensation film using a nematic liquid crystal according to the present invention, a polarizing film is used as a base film in a continuous rotary coating machine, and an alignment layer is coated on the transparent support surface of the polarizing film. Drying and curing to form an alignment film; A rubbing step of performing a rubbing treatment on the alignment layer; And a liquid crystal layer forming step of coating, drying, and curing a nematic liquid crystal on the rubbed alignment layer.

As the polarizing film used in the present invention, a conventionally produced one is used. That is, the polarizing film is a structure in which a polarizer protective layer is formed on the lower surface of the polarizer stretched after treating polyvinyl alcohol (PVA) with iodine or dichroic dye solution. The polarizer protective layer is made of a transparent support.

The transparent support may include a triacetyl cellulose (TAC) film, a polyethylene terephthalate (PET) film, an unstretched cyclo olefin (COP) -based film, and the like.

Hereinafter, a step-by-step look at the manufacturing method of the optical device with an IPS compensation film according to the present invention.

(1) alignment film forming step

The alignment film is prepared in the form of a solution by mixing an alignment film coating composition comprising an alignment film resin, a curing agent, an antistatic agent, a photopolymerization initiator, and a leveling agent in a solvent, and then continuously rotating the transparent support surface of the polarizing film cut to a predetermined size. After the coating is performed by the spin coating method in the coater, the alignment film is cured by drying and curing. The above-described functional layer may be coated on the surface of the polarizing film.

1) alignment layer coating step

In the present invention, an alignment film coating composition comprising an alignment film resin, a curing agent, an antistatic agent, a photopolymerization initiator, and a leveling agent is defined as a solvent and a solution in the form of an alignment film coating solution.

It is carried out by coating the alignment layer coating solution on the transparent support surface of the polarizing film cut into a predetermined size through a spin coating method.

The rotation speed and rotation time applied in the spin coating method of the present invention are as follows.

In the present invention, it is preferable to coat the alignment layer coating solution at a rotational speed of 50 rpm to 5,000 rpm, and more preferably 100 rpm to 4,000 rpm. Even more preferred spin speeds range from 500 rpm to 3,000 rpm.

If the rotation speed of the spin coating is less than 50 rpm, the desired predetermined thin film may not be obtained, and the alignment layer may not be evenly applied to the surface of the polarizing film. In addition, when it is larger than 5,000 rpm, a difference in thickness occurs in the center portion and the outer portion of the alignment layer due to the high centrifugal force. In addition, in order to maintain a high rotational speed can be difficult to spin coating apparatus and affect the durability of the polarizing film itself.

In addition, the spin time in the spin coating step of the present invention is preferably 10 seconds to 500 seconds, more preferably 30 seconds to 400 seconds. Even more preferably 60 to 300 seconds. The rotation time may vary depending on the viscosity of the alignment film coating solution and the thickness of the alignment film to be coated.

If the rotation time is less than 10 seconds, it is difficult to secure sufficient time for evenly applying the alignment layer to the polarizing film, and if it is more than 500 seconds, the economic efficiency is inferior.

It is preferable to use ultraviolet curable resin for the orientation film resin used by this invention. For example, an unsaturated polyester resin, a monofunctional or bifunctional or higher acrylate resin, a monofunctional or bifunctional or higher methacrylate, a urethane acrylate, an epoxy acrylic resin, an epoxy acrylate resin or the like may be used alone or in combination. Of course, if the alignment film resin usable in the present invention exhibits the same effect, the range is not limited to the resins listed above.

In addition, the said alignment film resin uses the compound which has a 1 or more polar group and 1 or more functional group in a molecule | numerator. The at least one polar group is preferably at least one of a hydroxy group, an amino group, a urethane group or an isocyanate ring in the compound, and different polar groups may be present. As the alignment film has a smaller surface resistance, the vertical alignment of the liquid crystal to be described later increases, so that an alignment film resin having a small surface resistance is preferably used. For example, it is preferable to use a resin having a side chain.

The content of the alignment film resin is preferably 15 wt% to 55 wt% in 100 wt% of the alignment film coating solution. More preferably, it is 20 to 40 weight%. If the content of the alignment film resin is less than 15% by weight, the hardness is low to insufficient to form the alignment film, if more than 55% by weight more than necessary there is a disadvantage in that the economical efficiency of the alignment film resin is included.

In addition, the curing agent may be used by selecting one curing agent or a mixture of two or more according to the type of alignment film resin, preferably isocyanate compound, epoxy compound, aziridine compound, metal chelate compound, metal alkoxide metal salt, amine A compound, a hydrazine compound, etc. are used individually or in mixture.

In the present invention, since only the ultraviolet curable resin is used as the alignment film resin, it is preferable to use only the ultraviolet curable curing agent for the curing agent. In addition, it is preferable to adjust and select the type, size, content, etc. of the curing agent according to the type, physical and chemical properties of the curable resin to be used.

Isocyanate compounds in the present invention are trimethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane isocyanate, xylene diisocyanate aromatic diisocyanate compounds such as diisocyanate, aliphatic diisocyanate such as hexamethyl diisocyanate, and the like are used alone or in combination.

In addition, the epoxy compound in the present invention is a polyethylene glycol diglycidyl ether (diglycidyl ether), diglycidyl ether (diglycidyl ether), trimethylol propane triglycidyl ether (trimethylol propane triglycidyl ether) and the like alone Or mixed.

The curing agent used to form the alignment film of the present invention is preferably used 0.1% to 10% by weight, more preferably 0.5% to 5% by weight relative to 100% by weight of the alignment film coating solution.

In the present invention, the curing agent is an additive used to control the molecular weight or the chain structure of the alignment layer coating composition. When the curing agent is used in the above-described range, the effect of suppressing phase separation and the like is prominent. When the content of the curing agent is less than 0.1% by weight, it is difficult to expect the function of the curing agent, and when the content of the curing agent is greater than 10% by weight, the content of the curable resin is relatively low, making it difficult to increase hardness.

The antistatic agent used in the present invention is used alone or mixed with a conductive polymer.

The conductive polymer used as an antistatic agent in the present invention is polyacetylene, poly (p-phenylene) [poly (p-phenylene)], polythiophene, poly (3,4-ethylenedioxythiophene ) [Poly (3,4-ethylenedioxythiophene) (PEDOT)], Polypyrrole [Polypyrrole (pyridine polymer)], Poly (p-phenylene sulfide) [Poly (p-phenylene sulfide)], Poly (p-phenylene vinylene ) [Poly (p-phenylene vinylene)], poly (thienylene vinylene), polyaniline (Polyaniline) and the like can be used alone or in combination.

In addition, in the present invention, it is possible to use a conductive polythiophene-based polymer resin having a high electrical conductivity and a relatively stable and relatively transparent conductive coating film in the atmosphere. Examples thereof include 3-alkyl thiophene, 2,3-dimethylthiophene, 2,3-dimethyl-5-benzoylthiophene, and 2,3-dimethyl-5- (α-hydroxybenzyl) thio Offen, 2,3-dimethyl-5- (α-hydroxybenzyl) thiophene, 2,3-dimethyl-5-benzylthiophene, 3,4- (ethylenedioxy) thiophene and the like. The content of the thiophene-based polymer resin is preferably contained in 10% by weight to 80% in 100% by weight of the antistatic agent. More preferably, it is 40 to 65 weight%. When the content of the thiophene-based polymer resin is less than 10% by weight, the effect of improving the conductivity and improving the transparent line is inadequate, and when the content is more than 80%, the economy is inferior to the effect.

The antistatic agent is preferably used in an amount of 1.5 wt% to 5.5 wt%, more preferably 2.5 wt% to 4 wt%, in 100 wt% of the alignment film coating solution. If the content of the antistatic agent is less than 1.5% by weight, it is difficult to secure the conductivity, and when the content of the antistatic agent is greater than 5.5% by weight, the conductive effect is remarkable, but the transparency is lowered, and the productivity and economic efficiency may be deteriorated.

The photoinitiator used in the present invention is diethoxyacetphenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyl dimethyl ketal, 1-hydroxycyclohexyl-phenyl ketone, 2-methyl-2 Benzoin ethers such as acepine (4-thiomethylphenyl) propane-1-one, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfite, 4-benzoyl-N, N-dimethyl-N- [2- (1-oxo-2-propenyloxy) Ethyl] benzophenones such as benzenemethamenium bromide and (4-benzoylbenzyl) trimethylammonium chloride, thioxanthones such as 2,4-diethyl thioxanthone and 1-chloro-4-dichlorothioxanthone; 2, 4, 6-trimethylbenzoyldiphenylbenzoyl oxide, etc. can be used individually or in mixture. Moreover, as an accelerator (sensitizer), amine compounds, such as N, N- dimethyl paratoluidin, and 4, 4'- diethylamino benzophenone, can also be used individually or in mixture.

The content of the photopolymerization initiator is preferably 1% by weight to 6% by weight, more preferably 2.5% by weight to 5% by weight based on 100% by weight of the alignment film coating solution. If the content of the photoinitiator is less than 1% by weight, it is difficult to obtain a photopolymerization effect. If the content of the photoinitiator is more than 6% by weight, too much photoinitiator is added as compared to the photoinitiator effect, thereby reducing economic efficiency.

In the present invention, a leveling agent is used to even the surface of the alignment film. The leveling agent can be used by mixing a ketone or an ester solvent with silicone resin. As a leveling agent by this invention, it is preferable to use a silicone diacrylate and a silicone polyacrylate compound individually or in mixture.

The content of the leveling agent is preferably 0.1% to 3% by weight, more preferably 0.5% to 2% by weight in 100% by weight of the alignment film coating solution. If the leveling agent is less than 0.1% by weight, it is difficult to expect the leveling effect. If the leveling agent is greater than 3% by weight, the surface hardness of the alignment film according to the present invention may be weakened.

In addition, when the fluorine-based resin and the silicone-based resin are used together, the content of the leveling agent is only 70% to 80% of the leveling agent content when using the fluorine-based resin. This is because the silicone resin itself acts as a leveling agent.

In addition, the solvent used in the alignment film coating step may be suitably mixed with the alignment film coating composition (composition comprising a alignment film resin and a curing agent). A representative example is Iso Propyl Alcohol (IPA).

The viscosity of the solution containing the alignment film resin is preferably 1 cps to 500 cps. When the viscosity is 1 cps or less, the thickness of the alignment film to be manufactured may be controlled to be thin. However, the hardness of the alignment film may be lowered, which may be insufficient to function the alignment film. It is difficult to control the thickness, and a problem arises in that a part of the film becomes thick.

2) Alignment layer drying step

In the alignment film drying step, a process of drying the polarizing film to which the alignment film is uniformly applied in step 1) is performed. That is, in the alignment film drying step, the solvent applied in the alignment film coating step is volatilized.

The alignment layer drying step is carried out in a continuous rotary coating machine, the rotation speed is preferably performed at 100rpm to 6,000rpm. Rotation speed below 100rpm is difficult to implement the function of drying properly, the rotation speed of 6,000rpm or more can cause a burden on the device.

The drying temperature performed in the drying step is preferably 15 ℃ to 60 ℃, more preferably 25 ℃ to 50 ℃. If the drying temperature is lower than 15 ℃, it takes a long time to remove the solvent, if the drying temperature is higher than 60 ℃ may affect the physical properties of the alignment film.

Moreover, as for drying time, about 15 second-about 250 second are preferable. More preferably 55 to 200 seconds, still more preferably 60 to 100 seconds. If the drying time is less than 15 seconds, the effect of drying does not appear properly, and drying for more than 250 seconds may affect the physical properties.

3) Alignment film curing step

In the alignment film curing step, an alignment film layer is formed by applying UV light to the alignment film dried in the step 2).

The UV curing step is performed to completely adhere the dried alignment layer to the polarizing film and to completely remove the solvent that could not be removed in the drying process.

In addition, the energy range of UV is preferably 250mJ / cm ² to 600mJ / cm ² . If the amount of energy irradiation is 250mJ / cm ² or less, sufficient curing effect does not appear, if the 600mJ / cm ² or more may affect the physical properties of the alignment layer.

The curing time is relatively determined corresponding to the energy irradiation amount of UV, the curing time is preferably 45 seconds to 130 seconds. If the curing time is 45 seconds or less, the effect of curing does not appear sufficiently. If the curing time is 130 seconds or more, the physical properties and durability of the alignment film may be affected, thereby degrading the function of the alignment film. The above-mentioned ultraviolet curing uses ultraviolet rays emitted from light sources such as ultra high temperature mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc, metal halide lamp and the like.

It is preferable to form the said oriented film so that the thickness may be set to 0.01 micrometer-5 micrometers. More preferably, they are 0.05 micrometer-3 micrometers. If the thickness is thicker than 5 μm, the thickness of the IPS compensation film becomes thicker than necessary, and if the thickness is thinner than 0.01 μm, the nematic liquid crystal, which will be described later, cannot be properly aligned, and thus the IPS-LCD compensation cannot be properly performed. have.

(2) rubbing

In the rubbing step, the antistatic alignment film formed in the step (1) is passed through the rubbing device to perform a process of helping the alignment in a predetermined direction on the surface. Although the rubbing step is not particularly limited, it is preferable that the process is smooth since it affects the orientation and uniformity of the liquid crystal compound later. In the rubbing treatment performed in the rubbing step, for example, a rubbing roll is manufactured by attaching a velvet-shaped cloth in which fibers such as lenyon, nylon, cotton, and aramid are attached to a roll, and the organic material is coated in a state where the roll is rotated at high speed. How to treat the surface. Or a rubbing process can be performed by carrying out high speed rotation in the state which fixed the rubbing roll, and conveying a film, making contact with a rubbing roll. Conditions for rubbing treatment include the type of polymer film or plastic film or cloth to be used, the diameter of the rubbing roll or the rotation speed and rotation direction of the rubbing roll, the moving speed of the polymer film or rubbing roll, and the pressure of the rubbing roll to the polymer film. It is set differently according to the degree. The rubbing is preferably processed to have a vertical alignment of the liquid crystal to be described later. Due to the rubbing treatment in the above direction, the liquid crystal layer to be described below serves as a positive C plate.

(3) liquid crystal layer forming step

In the present invention, the liquid crystal layer forming step is performed by coating, drying, and curing the liquid crystal layer by a spin coating method in a continuous rotary coater on the antistatic alignment film rubbed in the rubbing step.

1) Liquid Crystal Layer Coating Step

Nematic liquid crystals are liquid crystals that have an order of orientation in the direction assuming the molecular axis, although there is no regularity in the molecular position. Nematic liquid crystals are generally ferroelectric because the polarization is canceled because the directions of molecules are almost equal to up and down. Indicates.

In the liquid crystal layer coating step, the liquid crystal composition containing the nematic liquid crystal is coated on the alignment layer by spin coating in a continuous rotary coater in the form of a solution (hereinafter, 'liquid crystal coating solution') in a solvent.

The rotation speed and rotation time applied in the spin coating method of the present invention are as follows.

In the present invention, it is preferable to coat the liquid crystal coating solution at a rotational speed of 50 rpm to 5,000 rpm, and more preferably 100 rpm to 4,000 rpm. Even more preferred spin speeds range from 500 rpm to 3,000 rpm.

If the rotation speed of the spin coating is less than 50 rpm, the desired predetermined thin film may not be obtained and the liquid crystal layer may not be evenly applied to the surface of the antistatic alignment film. In addition, when greater than 5,000rpm, the thickness difference occurs in the center and the outer portion of the liquid crystal layer due to the high centrifugal force. In addition, in order to maintain a high rotational speed can be difficult to spin coating apparatus and affect the durability of the polarizing film itself.

In addition, the spin time in the spin coating step of the present invention is preferably 10 seconds to 500 seconds, more preferably 30 seconds to 400 seconds. Even more preferably 60 to 300 seconds. The rotation time may vary depending on the viscosity of the liquid crystal coating solution and the thickness of the liquid crystal layer to be coated.

If the rotation time is less than 10 seconds, it is difficult to ensure sufficient time for evenly applying the liquid crystal layer to the antistatic alignment film, and if it is more than 500 seconds, the economic efficiency is poor.

It is preferable that the nematic liquid crystal used has vertical alignment property. As one example, liquid crystals exhibiting homeotropic molecular arrangements are preferred. In addition, the use of a curable nematic liquid crystalline polymer in which a predetermined amount of an optically active component is added to a liquid crystalline polymer capable of easily fixing its alignment state (the monomer form becomes a polymer form after the curing step described later). desirable. The reason for using the curable nematic liquid crystal is that it should be used as a compensation film.

As the optically active component, any one can be used as long as it exhibits optical activity, but it is preferable to use an optically active polymer compound or a polymer composition. As long as it has an optically active group in a molecule | numerator, all can be used, It is preferable from a viewpoint of compatibility with the said liquid crystalline polymer that it is an optically active liquid crystalline high molecular compound or a liquid crystalline polymer composition. Examples of the liquid crystalline polymers include polyacrylates, polymethacrylates, polymalonates, polysiloxanes, polyesters, polyamides, polyesteramides, polycarbonates, polypeptides, celluloses, and compositions based on these liquid crystalline polymers. Can be. Especially, the liquid crystalline polyester which is optically active of an aromatic principal is contained as a preferable example.

Moreover, as a liquid crystalline polymer which has an optically active group in a molecule | numerator, Polyacrylate which has an optically active group in the side chain of polyester, polyimide, polyamide, polycarbonate, polyesterimide, or a polymer which has an optically active group in a polymer main chain, Polymethacrylate, polymalonate, polysiloxane, etc. are mentioned as an example. Among them, liquid crystal polyesters having good orientation and relatively easy synthesis are preferred. Examples of the structural unit of the polymer include aromatic or aliphatic diol units, aromatic or aliphatic dicarboxylic acid units, and aromatic or aliphatic hydroxycarboxylic acid units.

In addition, as a solvent used to dissolve the liquid crystal composition including the nematic liquid crystal, halogenated hydrocarbons such as chloroform, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene and o-dichlorobenzene, and Mixed solvents with phenols, kentones, ethers, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone, sulfolane, cyclohexanone, xylene, toluene and the like.

The content of the liquid crystal composition is preferably 15% by weight to 60% by weight, more preferably 20% by weight to 40% by weight in 100% by weight of the liquid crystal coating solution.

If the content of the liquid crystal composition is less than 15% by weight, the desired viewing angle compensation function cannot be performed properly. If the content of the liquid crystal composition is more than 60% by weight, the liquid crystal composition is contained more than necessary, which makes the control of the process difficult and economical. have.

In addition, the optically active component is preferably 5 parts by weight to 15 parts by weight with respect to 100 parts by weight of the nematic liquid crystalline polymer. More preferably, they are 8 weight part-13 weight part. If the content of the optically active ingredient is 5 parts by weight or less, the optically active function cannot be properly performed, and more than 15 parts by weight is meaningless because there is no difference in effect.

In addition, the liquid crystal coating solution preferably has a viscosity of 1 cps to 600 cps, more preferably 10 cps to 450 cps. Even more preferred is 50cps to 300cps.

When the viscosity of the liquid crystal coating solution is less than 1 cps, it is difficult to easily apply the liquid crystal coating solution due to the low adhesive strength. When the viscosity of the liquid crystal coating solution is larger than 600 cps, the adhesive force is too large to control the process.

2) drying step

The drying step is performed to remove the solvent applied to the liquid crystal layer in the liquid crystal layer coating step.

The liquid crystal layer drying step is carried out in a continuous rotary coating machine, the rotation speed is preferably performed at 100rpm to 6,000rpm. Rotation speed below 100rpm is difficult to implement the function of drying properly, the rotation speed of 6,000rpm or more can cause a burden on the device.

The drying temperature performed in the drying step is preferably 15 ℃ to 60 ℃, more preferably 25 ℃ to 55 ℃. If the drying temperature is lower than 15 ℃ it takes a long time to remove the solvent, if the drying temperature is higher than 60 ℃ may affect the properties of the liquid crystal layer.

Moreover, as for drying time, about 15 second-about 300 second are preferable. More preferably 55 to 200 seconds, still more preferably 60 to 100 seconds. If the drying time is less than 15 seconds, the effect of drying does not appear properly, and drying for more than 300 seconds may affect the physical properties.

3) liquid crystal layer curing step

In the liquid crystal layer curing step, ultraviolet light (UV) is applied to the liquid crystal layer dried in the drying step to form a liquid crystal layer.

The hardening of the liquid crystal layer is performed to completely attach the dried liquid crystal layer to the antistatic alignment layer and to completely remove the solvent that was not removed in the drying process.

In addition, the energy range of UV is preferably 250mJ / cm ² to 600mJ / cm ² . If the amount of energy irradiation is 250mJ / cm ² or less, sufficient curing effect does not appear, if the 600mJ / cm ² or more may affect the physical properties of the alignment layer.

The curing time is relatively determined corresponding to the energy irradiation amount of UV, the curing time is preferably 45 seconds to 130 seconds. If the curing time is 45 seconds or less, the effect of curing does not appear sufficiently. If the curing time is 130 seconds or more, the physical properties and durability of the liquid crystal layer may be affected, thereby degrading the function of the liquid crystal layer. The above-mentioned ultraviolet curing uses ultraviolet rays emitted from light sources such as ultra high temperature mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc, metal halide lamp and the like.

It is preferable that the liquid crystal layer is formed to have a thickness of 0.5 μm to 20 μm. More preferably, they are 1 micrometer-10 micrometers. If the thickness of the liquid crystal layer is thinner than 0.5㎛ it is difficult to perform the desired viewing angle compensation function, when the thickness of more than 20㎛ has a disadvantage that the thickness of the viewing angle compensation film.

1 is a structural diagram in which an optical device having an IPS compensation film using an antistatic alignment film manufactured through the above process is attached to an IPS LCD cell by an adhesive. As shown, a polarizer film having transparent supports 100 and 300 attached to upper and lower surfaces of the polarizer 200 is provided, and an antistatic alignment layer 400 is coated on the transparent support 300, and a liquid crystal layer thereon. (500) The coated optical device according to an embodiment of the present invention is a structure attached to the IPS LCD cell 700 by the adhesive 600. The liquid crystal layer 500 serves as a positive C plate.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the following examples are only examples of the present invention and the present invention is not limited to these examples.

Example 1

1) After adding 10 g of a tetrafunctional methacrylate derivative and 1 g of a conductive polymer (polythiophene) to 90 g of isopropyl alcohol (IPA), a solution was prepared. By stirring, an antistatic alignment film coating solution was prepared.

2) After manufacturing the polarizing film in a conventional method, after cutting to 500mm horizontally and vertically, the alignment layer is coated on the transparent support (TAC surface) surface of the polarizing film by using the alignment layer coating solution in a continuous rotary coating machine, dried, UV It irradiated and obtained the orientation film of 1 micrometer in thickness. The rotation speed was 200 rpm. In addition, the drying was carried out to a temperature of 25 ℃, time for 1 minute. Curing was performed by irradiation with 300mJ / cm ² UV.

3) The alignment film was subjected to a rubbing treatment (rubbing treatment with a cloth) in the absorption axis direction of the polarizing film.

4) As the liquid crystal, coating was performed using a nematic curable liquid crystal solution (Merck's RMS04-015). The nematic curable liquid crystal solution (Merck's RMS04-015) is one in which 33% by weight of nematic liquid crystal is dissolved in a mixed solvent of xylene and cyclohexanone (liquid crystal coating solution). The liquid crystal coating solution was coated on the alignment layer by spin coating (rotational speed 500 rpm, rotation time 1 minute), dried at 25 ° C. for 1 minute, and then UV cured with energy of 300 mJ / cm ² to form a liquid crystal layer. An optical device with a compensation film for IPS was prepared such that the thickness of the liquid crystal layer was 1 μm.

Example 2

The viewing angle compensation film was manufactured under the same conditions as in Example 1 except that the thickness of the liquid crystal layer was increased to 1.5 μm.

Example 3

The viewing angle compensation film was manufactured under the same conditions as in Example 1 except that the thickness of the liquid crystal layer was increased to 2 μm.

Comparative Example 1

The viewing angle compensation film was manufactured under the same conditions as in Example 2 except that the alignment film without the conductive polymer was used.

Table 1 shows the adhesiveness, transmittance, cross-transmittance, polarization degree, and color value of the optical elements obtained in Examples 1, 2, 3, and Comparative Example 1.

division Adhesion Transmittance (%) Cross Transmittance (%) Polarization degree (%) L a b Example 1 100/100 41.41 0.002 99.996 64.34 -1.40 4.10 Example 2 100/100 41.70 0.002 99.994 64.56 -1.48 4.10 Example 3 100/100 41.93 0.002 99.994 64.74 -1.41 3.98 Comparative Example 1 100/100 41.34 0.001 99.997 64.29 -1.34 3.89

(L, a, b color coordinates)

In Examples 1 to 3, by adding the conductive polymer, compared with Comparative Example 1 (not using the conductive polymer), even if the antistatic function is provided, referring to Table 1, almost the same physical properties It can be seen that. This means that the embodiments 1 to 3 to which the antistatic function is applied can be used as optical elements of the same use.

2 to 4 are graphs illustrating a change in phase difference according to an inclination angle with respect to the phase axis of the optical device obtained in Example 3, and FIG. 5 is a phase difference according to the inclination angle with respect to the phase axis of the optical device used in Comparative Example 1. Graph showing change. According to this, it can be seen that the thicker the liquid crystal layer, the smaller the phase difference change appears. This means that the thicker the liquid crystal layer, the better the function of the viewing angle compensation.

6 to 8 are graphs of the transmittances of the optical elements obtained in Examples 1 to 3, and FIG. 9 is a graph of the transmittances of the optical elements obtained in Comparative Example 1. FIG.

As shown in the figure, all four graphs show almost the same transmittance, which means that they can be used as optical elements for the same purpose. The transmittance is about 35% to 45% because the compensation film is coated on the polarizing film.

In the above, this invention was demonstrated in detail with reference to an Example and a comparative example centering on a structure. However, the scope of the present invention is not limited to the above embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention as claimed in the claims, any person of ordinary skill in the art is deemed to be within the scope of the claims underlying the present invention to the extent possible for various modifications.

In addition, the preferred range, more preferred range, and even more preferred range limitation in the present invention are intended to maximize the effect even more, and more satisfactory technical effects can be obtained by narrowing the limited range.

As described above, an optical element manufacturing method and an optical element manufactured by the method for manufacturing an optical element with an IPS compensation film using an antistatic alignment film according to the present invention on the transparent support surface of the polarizing film in a continuous rotary coating machine By forming an alignment layer to which the antistatic function is added and coating the nematic liquid crystal, it can be formed into a thin film while functioning as a + C-plate compensation film.

In addition, by adding an antistatic function to the alignment layer, it also has the effect that it is possible to effectively remove foreign substances and static electricity generated during rubbing.

In addition, by using the spin coating method without using the stretching method, the complexity of the process can be solved, and there is an advantage that a uniform liquid crystal layer can be formed.

Claims (10)

(a) In a continuous rotary coating machine having a rotation speed of 50 rpm to 5,000 rpm and a rotation time of 10 seconds to 500 seconds, an alignment layer coating composition including an alignment layer resin, a curing agent, an antistatic agent, a photopolymerization initiator, and a leveling agent is mixed in a solvent. In 100% by weight of one alignment film coating solution, Iii) 15 wt% to 55 wt% of the alignment film resin Ii) 0.1% to 10% by weight of the curing agent Iii) 1.5 wt% to 5.5 wt% of the antistatic agent Iii) 1% to 6% by weight of the photopolymerization initiator Iii) an alignment layer forming step of coating the alignment layer coating solution mixed with 0.1 wt% to 3 wt% according to the spin coating method on the transparent support surface of the polarizing film, and drying and ultraviolet curing to form an alignment layer; (b) a rubbing step of rubbing the alignment film formed in the step in the absorption axis direction of the polarizing film; And (c) spin coating the liquid crystal coating solution in which the nematic liquid crystal is mixed at 15% by weight to 60% by weight on the rubbed alignment layer at a rotational speed of 50 rpm to 5,000 rpm, and a rotation time of 10 seconds to 500 seconds. The method of manufacturing an optical device having a compensation film for IPS using an antistatic alignment layer, comprising: forming a liquid crystal layer by performing drying and ultraviolet curing. The method of claim 1, The alignment film resin is at least one of unsaturated polyester resin, mono- or bi-functional acrylate resin, mono- or bi-functional methacrylate, urethane acrylate, epoxy acrylic resin, epoxy acrylate resin A method of manufacturing an optical device having a compensation film for IPS using a protective alignment film. The method of claim 1, The antistatic agent is polyacetylene, poly (p-phenylene) [Poly (p-phenylene)], polythiophene, poly (3,4-ethylenedioxythiophene) [Poly (3,4 -ethylenedioxythiophene) (PEDOT)], polypyrrole [pyridine polymer], poly (p-phenylene sulfide) [poly (p-phenylene sulfide)], poly (p-phenylene vinylene) [Poly (p-phenylene vinylene)], poly (thienylene vinylene), and a method of manufacturing an optical device with a compensation film for IPS using an antistatic alignment film, characterized in that the conductive polymer consisting of at least one of polyaniline (Polyaniline). . The method of claim 1, In the step (c), the nematic liquid crystal has a vertical alignment, and a curable nematic liquid crystal polymer in which an optically active component is added to the liquid crystal polymer is used, and the optical activity is 100 parts by weight of the nematic liquid crystal polymer. Method for producing an optical element with a compensation film for IPS using an antistatic alignment film, characterized in that 5 parts by weight to 15 parts by weight with respect to. The method of claim 4, wherein The nematic liquid crystalline polymer is an antistatic alignment layer, characterized in that at least one of polyacrylate, polymethacrylate, polymalonate, polysiloxane, polyester, polyamide, polyesteramide, polycarbonate, polypeptide, cellulose. Method of manufacturing an optical device having a compensation film for IPS used. The method of claim 1, The viscosity of the alignment layer coating solution of the step (a) is 1cps to 500cps characterized in that the optical device with a compensation film for IPS using an antistatic alignment film, characterized in that. The method of claim 1, The viscosity of the liquid crystal coating solution of the step (c) is 1cps to 600cps method of manufacturing an optical element with a compensation film for IPS using an antistatic alignment film, characterized in that. The method of claim 1, The liquid crystal layer formed in the step (c) is a thickness of 0.5㎛ to 20㎛ manufacturing method of the optical element with a compensation film for IPS using an antistatic alignment film, characterized in that the coating. The method of claim 1, The solvent used in the step (c) is a halogenated hydrocarbon such as chloroform, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, O-dichlorobenzene, mixed solvent of these and phenols, kentones, ethers , Dimethylformamide, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone, sulfolane, cyclohexanone, xylene, toluene is provided with a compensation film for IPS using an antistatic alignment film, characterized in that at least one Method of manufacturing an optical element. An optical device having a compensation film for IPS using an antistatic alignment film, characterized in that it is manufactured by the manufacturing method according to any one of claims 1 to 9.

Images