KR101922284B1 - Optical film and polarizer plate comprising the same and display device comprising the polarizer plate - Google Patents

Optical film and polarizer plate comprising the same and display device comprising the polarizer plate Download PDF

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Publication number
KR101922284B1
KR101922284B1 KR1020150061641A KR20150061641A KR101922284B1 KR 101922284 B1 KR101922284 B1 KR 101922284B1 KR 1020150061641 A KR1020150061641 A KR 1020150061641A KR 20150061641 A KR20150061641 A KR 20150061641A KR 101922284 B1 KR101922284 B1 KR 101922284B1
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South Korea
Prior art keywords
polarizer
protective film
contact angle
film
coating layer
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KR1020150061641A
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Korean (ko)
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KR20160129455A (en
Inventor
김진우
배창석
이정균
여종훈
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삼성에스디아이 주식회사
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    • G02B1/105—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Polarising Elements (AREA)

Abstract

An optical film, a polarizing plate including the same, and a polarizing plate are provided. The optical film may include a polarizer protective film and a hard coating layer formed on one side of the polarizer protective film, wherein a contact angle of the one side of the hard coating layer may be smaller than a contact angle of the other side of the polarizer protective film, .

Description

TECHNICAL FIELD [0001] The present invention relates to an optical film, a polarizing plate including the optical film, and a display device including the polarizing plate.

The present invention relates to an optical film, a polarizing plate comprising the same, and a method for producing a polarizing plate.

On the other hand, a liquid crystal display device or an organic light emitting device (electro luminescence) optically modulates transmitted light according to an input image signal or self-emits a luminance pixel corresponding to an image signal, thereby obtaining gradation for each pixel. The layer for modulating the transmitted light or the light emission luminance for each pixel is referred to as a modulation function layer. In the liquid crystal display device, the liquid crystal layer corresponds to the modulation function layer, and in the organic light emitting element, the organic EL light emission layer corresponds to the modulation function layer.

Since the liquid crystal layer itself is not a light valve that completely blocks light, a polarizing plate may be disposed on both sides in the vertical direction of both liquid crystal layers in the vertical direction of the liquid crystal layer, that is, on the backlight side and the viewer side of the viewer have.

On the other hand, since the light emitting layer of the organic light emitting device does not irradiate light when no voltage is applied, it is possible to display a full black color and provide a relatively high contrast as compared with a liquid crystal display device. Therefore, the organic light emitting element does not arrange the polarizer for the purpose of shielding the light emission. However, in the organic light emitting device, the external light can be reflected by the metal wiring therein, which causes a decrease in contrast. Therefore, a polarizing plate is disposed to prevent this.

The polarizer can be composed of iodine or a protective film attached to the dyed and oriented dyes in order to protect the polarizer and the polarizer. The protective film prevents iodine or dichromatic dye or the like, which are dyed on the polarizer, from escaping to the outside, and prevents penetration of moisture and the like.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an optical film comprising a polarizer protective film which is excellent in adhesion between a polarizing plate and a touch panel and uniformly adhered to a display device to which the touch panel is applied, and a polarizing plate comprising the optical film will be.

Further, the present invention provides a display device including such a polarizing plate.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.

According to an aspect of the present invention, there is provided an optical film comprising a polarizer protective film, and a hard coating layer formed on one side of the polarizer protective film, wherein a contact angle of the one side of the hard coating layer is a contact angle Lt; RTI ID = 0.0 > 0 < / RTI >

The contact angle of the one surface of the hard coat layer may be in the range of 30 to 50 degrees.

The contact angle of the one surface of the hard coat layer may be in the range of 38 to 50 degrees.

The contact angle of the other surface of the polarizer protective film may be in the range of 50 to 70 degrees.

In addition, the polarizer protective film may be formed of a polymer film such as methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, Polyacrylate, polyacrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate, silicone acrylate, and 2, 3, 4-trimethylolpropane trimethacrylate, pentaerythritol triacrylate, polyester acrylate, And at least one resin selected from the group consisting of 2,4-trimethyl-hexane-diisocyanate and 2,4-trimethyl hexane-diisocyanate.

According to an aspect of the present invention, there is provided a polarizing plate comprising a polarizer, a protective film disposed on at least one surface of the polarizer, and a hard coating layer disposed on one side of the protective film, May be smaller than the contact angle of the other surface of the protective film in a range of 0 to 40 degrees.

The contact angle of the one surface of the hard coat layer may be in the range of 30 to 50 degrees.

The contact angle of the one surface of the hard coat layer may be in the range of 38 to 50 degrees.

Further, the contact angle of the other surface of the protective film may be in the range of 50 ° to 70 °.

In addition, the protective film may be formed of at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, trimethyl Polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate, silicone acrylate, and 2,2-dodecylmethacrylate , 2,2,4-trimethyl-hexane-diisocyanate, and the like.

According to an aspect of the present invention, there is provided a display device including a display panel, a touch panel disposed on one surface of the display panel, and a polarizer interposed between the display panel and the touch panel, Wherein the polarizer protective film comprises a polarizer, a polarizer protective film disposed on at least one side of the polarizer, and a hard coating layer disposed on one side of the polarizer protective film, wherein a contact angle of the one side of the hard coat layer is 0 deg. Lt; RTI ID = 0.0 > 40. ≪ / RTI >

The contact angle of the one surface of the hard coat layer may be in the range of 30 to 50 degrees.

The contact angle of the one surface of the hard coat layer may be in the range of 38 to 50 degrees.

In addition, the hard coating layer may be disposed on a surface facing the touch panel.

The adhesive member may further include an optical clear adhesive (OCA) or an optical clear resin (OCR) interposed between the touch panel and the hard coating layer. .

The details of other embodiments are included in the detailed description and drawings.

The embodiments of the present invention have at least the following effects.

The optical film including the polarizer protective film of the present invention and the polarizer including the polarizer protective film of the present invention can be uniformly adhered with excellent adhesion between the polarizer and the touch panel in the display device.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a perspective view of an optical film according to an embodiment of the present invention.
2 is a perspective view of a polarizer according to an embodiment of the present invention.
3 is a perspective view of a polarizer according to another embodiment of the present invention.
4 is a schematic perspective view of a display device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being " on " other elements or layers, including both intervening layers or other elements directly on or in between. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

It should also be understood that the steps constituting the manufacturing method described herein may be sequential or sequential, or one step and the other step constituting one manufacturing method may be performed in the order described in the specification It is not construed as limited. Therefore, the order of the steps of the manufacturing method can be changed within a range that can be easily understood by a person skilled in the art, and a change apparent to a person skilled in the art accompanying thereto is included in the scope of the present invention.

Optical film

1 is a perspective view of an optical film according to an embodiment of the present invention. Referring to FIG. 1, an optical film according to an embodiment of the present invention includes a polarizer protective film 10 and a hard coating layer 20 formed on one side of the polarizer protective film 10. The contact angle of the one surface SA of the hard coating layer 20 may be smaller than the contact angle of the other surface FA of the polarizer protective film 10 in a range of 0 to 40 degrees. When a polarizing plate to be described later is attached to the touch panel in the range of the contact angle, the adhesive force between the polarizing plate and the touch panel is excellent, and uniform adhesion can be achieved.

More specifically, the contact angle of one surface SA of the hard coating layer 20 may be in a range of 30 to 50 degrees, for example, in a range of 38 to 50 degrees. In addition, the contact angle of the other surface FA of the polarizer protective film 10 may be in the range of 50 to 70 degrees. The adhesive force between the polarizing plate and the touch panel is excellent in the above-described range and can be uniformly bonded.

In the case of a general polarizer protective film, uniform adhesion at the time of adhesion between the polarizing plate and the touch panel due to a high contact angle may be difficult. That is, when the contact angle is high, an air layer may be formed between the touch panel and the polarizer, and when the adhesive resin is interposed between the touch panel and the polarizer, there may arise a problem that the air layer is partially embedded in the adhesive resin. The hard coating layer 20 is formed on one surface of the polarizer protective film 10 and the contact angle of the one surface SA of the hard coating layer 20 is adjusted to make the coupling between the touch panel and the polarizing plate more uniform .

On the other hand, the polarizer protective film 10 may be formed of a polymer such as methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexa Acrylate, acrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate, And at least one resin selected from the group consisting of 2,2,4-trimethyl-hexane-diisocyanate.

As the hard coating layer 20, an ultraviolet ray hardening resin may be used in consideration of process convenience and light transmittance. For example, acrylic resin or MMA (Methyle Methacrylate) may be used as the hard coat layer 20 .

In addition, the thickness of the hard coating layer 20 may be in the range of 3 탆 to 10 탆 in consideration of light transmittance and the like, It is not limited thereto, and the thickness can be adjusted to various ranges as required by those skilled in the art. On the other hand, when the thickness of the hard coat layer 20 is less than 3 탆, the pencil hardness may be lowered. If the hard coat layer 20 is more than 10 탆, it may not be easy to control appearance characteristics such as curl. On the other hand, the hard coat layer 20 can make the polarizing plate more hard even in a thin polarizing plate, thereby preventing deformation.

Polarizer

2 is a perspective view of a polarizer according to an embodiment of the present invention.

2, a polarizer according to an embodiment includes a polarizer 30, a polarizer protective film 10 disposed on at least one side of the polarizer 30, and a hard film 30 disposed on one side of the polarizer protective film 10. [ Coating layer 20. The contact angle of the one surface of the hard coat layer 20 may be smaller than the contact angle of the other surface of the polarizer protective film in a range of 0 to 40 degrees. That is, the polarizer protective film 10 and the hard coat layer 20 are as described in the optical film.

The contact angle of the one side of the hard coat layer 20 may be in a range of 30 to 50 degrees, for example, in a range of 38 to 50 degrees. The contact angle of the other surface of the polarizer protective film 10 may be in the range of 50 ° to 70 °. The adhesive force between the polarizing plate and the touch panel is excellent in the range of the contact angle, and uniform adhesion can be achieved. The hard coating layer 20 may be positioned on the viewer side when applied to a display panel to be described later. That is, the hard coating layer 20 may be positioned on the surface facing the touch panel positioned above the display panel.

On the other hand, the polarizer 30 may include a polyvinyl alcohol-based film in which iodine or a dichroic dye is oriented in a coordinated manner.

As a method for producing the polarizer 30, a polyvinyl alcohol-based film may be subjected to a step of dyeing, crosslinking, and stretching. The iodine or dichroic substance may be adsorbed and oriented in the polyvinyl alcohol-based film, and the iodine, dye or pigment molecule absorbs the light oscillating in the stretching direction of the polarizing film, and the light oscillating in the vertical direction is transmitted Polarized light having a specific vibration direction can be obtained.

The polarizer 30 may be manufactured through a step of dying, crosslinking or stretching the polyvinyl alcohol-based film alone, but it is also possible to produce the polarizer 30 by laminating a polyvinyl alcohol-based film on a substrate such as a film, have. When a polarizer is produced by laminating with a substrate, it is possible to manufacture a thinner polarizer while preventing the polyvinyl alcohol film from being judged in the course of drawing or the like. On the other hand, as the above-mentioned substrate, there can be used polycarbonate, polyacrylate, polyethylene terephthalate, polyethylene, triacetylcellulose, polystyrene, polyimide, polypropylene, cycloolefin, polyurethane But are not limited to, resins.

The step of saponification may be carried out by causing a polyvinyl alcohol-based film or a polyvinyl alcohol-based film to laminate a substrate on a substrate to form a laminated film, followed by impregnation with a solution of iodine or a dichroic substance. For example, the temperature of the iodine solution may be in the range of 20 ° C to 50 ° C, and the duration of the iodine solution may be in the range of 10 to 300 seconds. When an iodine solution is used as the iodine solution, an aqueous solution containing iodine (I 2 ) and iodide ions, for example, potassium iodide (KI) used as a solubilizing agent may be used. In an exemplary embodiment, the concentration of iodine (I 2 ) ranges from 0.01 to 0.5 wt% based on the total weight of the aqueous solution, and the concentration of potassium iodide (KI) ranges from 0.01 to 10 wt% based on the total weight of the aqueous solution have.

In an exemplary embodiment, the swelling step may be further included prior to carrying out the solidifying step. The swelling step may soften the molecular chains of the polyvinyl alcohol-based film and loosen the molecular chains so that the dichroic materials are homogeneously dyed in the polyvinyl alcohol-based film during the dyeing process, have. In this swelling process, the polyvinyl alcohol film may be stretched. In an exemplary embodiment, it may be carried out in a wet process in a swelling tank containing a swelling liquid. In addition, the swelling temperature may vary depending on the film thickness and the like, and may range, for example, from 15 캜 to 40 캜.

In another exemplary embodiment, the bridging step may further comprise a bridging step.

When the molecules of iodine or dichroic substance are dyed on the polyvinyl alcohol film in the step of salt-adsorption, the dichroic molecules are adsorbed on the polymer matrix of the polyvinyl alcohol-based film by using boric acid, borate, or the like. Examples of the crosslinking method include a deposition method in which a polyvinyl alcohol-based film is immersed in an aqueous solution of boric acid or the like, but the present invention is not limited thereto. The crosslinking method may be carried out by a coating method or a spraying method, It is possible.

On the other hand, in the step of stretching, the polyvinyl alcohol-based film may be subjected to a wet stretching method and / or a dry stretching method common to those skilled in the art.

Examples of the dry stretching method include inter-roll stretching method, heating roll stretching method, compression stretching method, tenter stretching method, and the like, and the wet stretching method Non-limiting examples include a tenter stretching method and a roll-to-roll stretching method.

In the case of the wet drawing method, drawing can be performed in an alcohol, water, or boric acid aqueous solution. For example, solvents such as methyl alcohol and propyl alcohol may be used, but the present invention is not limited thereto.

The stretching temperature and time may be appropriately selected depending on the material of the film, the desired elongation, the method of use, and the like. The stretching step may be uniaxial stretching or biaxial stretching. In order to produce a polarizing film to be adhered to a liquid crystal cell, biaxial stretching may be performed so as to realize a retardation property.

The order of the salt-drawing step and the step of stretching need not always be the same, but the order may be appropriately selected depending on the processing equipment and equipment, and in some cases, the step of stretching may be carried out in the step of salt- Process can be carried out at the same time. When the stretching step is carried out simultaneously with the salt-washing step, the stretching step may be carried out in the iodine solution. On the other hand, if the stretching step proceeds simultaneously with the crosslinking step, the stretching step may be carried out in an aqueous solution of boric acid.

In the case of using a substrate, the substrate may be removed to obtain a polyvinyl alcohol-based film in which iodine or a dichroic dye is oriented in a co-orientation, and the polyvinyl alcohol-based film thus obtained may be a polarizer 20 . The substrate may be adhered to the polyvinyl alcohol-based film with a constant adhesive force, and a peeling force higher than a predetermined force may be applied to remove the substrate.

The steps of producing the above-described polarizer are illustrative, and various methods used in the art as a method of manufacturing the polarizer are applicable, and are not limited thereto.

On the other hand, the polarizer protective film 10 may be formed of a polymer such as methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexa Acrylate, acrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate, And at least one resin selected from the group consisting of 2,2,4-trimethyl-hexane-diisocyanate.

On the other hand, the polarizer protective film 10 may include a UV screening agent, and examples of the UV screening agent include 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-methoxy- Benzophenone compounds such as benzophenone and the like, benzotriazole compounds such as 2- (2'-hydroxy-5-methylphenyl) benzotriazole and the like, hindered phenols such as phenyesarsylate and pt-biphenylsulfate An amine type, and the like.

On the other hand, when the polarizer protective film 10 is disposed only on one side of the polarizer 30 as in the polarizer of Fig. 2, a thinner polarizer can be produced. The polarizing plate may include an adhesive layer 15 interposed between the polarizer 30 and the polarizer protective film 10. The adhesive layer 15 may include an aqueous adhesive, And may include an ultraviolet curable adhesive.

The water-based adhesive may include at least one selected from the group consisting of a polyvinyl alcohol-based resin and a vinyl acetate-based resin, or may include a polyvinyl alcohol-based resin having a hydroxyl group, but is not limited thereto.

The ultraviolet curable adhesive may include an acrylic compound, for example, acrylic, urethane-acrylic, or epoxy. However, the present invention is not limited thereto.

When the polarizer protective film 10 is disposed on only one side of the polarizer 30 as shown in FIG. 2, the adhesive layer 35 may be disposed on the other side of the polarizer 30, . In addition, although not shown separately, a release film may be attached to one side of the adhesive layer 35 to facilitate storage and transportation of the polarizer.

3 is a perspective view of a polarizer according to another embodiment of the present invention. Referring to FIG. 3, the polarizing plate may include polarizer protective films 10 and 40 disposed on both sides of the polarizer 30. In this case, adhesive layers 15 and 25 are provided on both sides of the polarizer 30, And may be interposed between the films 10 and 40. [ The adhesive layers 15 and 25 may include the water-based adhesive and the ultraviolet curable adhesive described above.

3, when the polarizer protective films 10 and 40 are disposed on both sides of the polarizer 30, the hard coat layer 20 may be formed on one surface of the polarizer protective films 10 and 40 , And the contact angle of the hard coat layer 20 may satisfy the range described above. The hard coating layer 20 may be positioned on the viewer side when applied to a display panel to be described later. That is, the hard coating layer 20 may be positioned on the surface facing the touch panel positioned above the display panel.

Polarizing plate manufacturing method

Although not shown separately, the present invention provides a polarizing plate manufacturing method, and a polarizing plate manufacturing method according to an embodiment of the present invention includes forming a hard coating layer on one surface of a base film, forming a polarizer protective film on the hard coating layer And laminating a polarizer on one side of the polarizer protective film with an adhesive layer interposed therebetween.

The polarizing plate manufacturing method may further include removing the base film. That is, the base film may be a release film which is removed after the polarizing plate is manufactured. The base film may be a known plastic film or glass. Examples of the base film include a polyethylene terephthalate film, a triacetylcellulose film, a polyarylate film, a polyimide film, a polyether film, a polycarbonate film, a polysulfone film, A polyether sulfone film, and the like can be used, but the present invention is not limited thereto.

The step of forming the hard coating layer may be performed by coating a resin of a UV curing type solvent type to a predetermined thickness on the base film using a gravure coater, evaporating the organic solvent in a drying zone, and performing ultraviolet curing But is not limited thereto.

Meanwhile, as described above, the polarizer protective film may include an acrylic resin and may be formed on the hard coating layer by a casting method.

The casting method can be carried out by casting a solution containing an acrylic resin constituting the polarizer protective film on the hard coat layer, evaporating the solvent, or curing the ultraviolet ray. have.

The step of forming the polarizer protective film on the hard coating layer by the casting apparatus will be described as an example. The solution containing the acrylic resin is supplied onto one surface of the substrate film by the discharge device through the material introduction portion of the casting apparatus And can be discharged onto the formed hard coat layer.

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, Triacrylate, polyacrylate, epoxy acrylate, polyester acrylate, melamine acrylate, silicone acrylate, and 2,2,4-trimethylolpropane triacrylate. (2,2,4-trimethyl-hexane-diisocyanate), and the like.

On the other hand, the solution may contain a photoinitiator for ultraviolet curing. The photoinitiator may be a radical polymerization initiator such as an acetophenone-based initiator or a cationic polymerization initiator such as an aromatic diazonium salt or an aromatic sulfonium salt, either singly or in combination However, the present invention is not limited thereto.

The solution may also include a cross-linking agent, which may include, but is not limited to, tolylene diisocyanate, hexamethylene diisocyanate or ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether .

Further, it may further include a solvent and an additive, an ultraviolet screening agent, and the like, which are well known in the art, and a detailed description thereof will be omitted.

The solution injected into the discharging device is discharged onto a film on which a base film and a hard coat layer are laminated in a specific direction in a lower part of the casting apparatus, and the discharging process is performed by a discharging part such as a nozzle having a narrow inlet The solution can be cast by uniformly discharging, whereby the solution containing the acrylic resin can be uniformly cast on the upper side of the substrate.

The casting method may be a method in which the solution containing the acrylic resin is dropped onto the hard coating layer while the laminated film proceeds at a uniform speed in a predetermined direction, but the present invention is not limited thereto, The casting apparatus itself may be moved at a constant speed while the casting apparatus itself is stopped, and at the same time, the solution may be discharged. Next, the method may include drying the cast solution on the hard coating layer, whereby the solvent is evaporated to produce a laminated film in which the polarizer protective film is laminated on the hard coating layer. The drying step may be performed by a drying apparatus, and the drying step may be performed by heat curing or UV curing, but is not limited thereto.

Next, a step of joining the polarizer with one side of the polarizer protective film, that is, the side on which the hard coating layer is not formed is interposed between the polarizer and the polarizer protective film and the hard coating layer are sequentially formed on either side of the polarizer Can be produced. The adhesive layer has already been described, and a duplicate description will be omitted.

When a polarizer protective film is disposed on both sides of the polarizer as shown in Fig. 3, another polarizer protective film is attached to the other side of the polarizer protective film via an adhesive layer, thereby forming a polarizer protective film on both surfaces of the polarizer A polarizing plate may also be produced.

On the other hand, it may include peeling the base film attached to one surface of the hard coat layer. The base film may be peeled off after attachment of the polarizer, but is not limited thereto.

Display device

4 is a perspective view schematically showing a display device according to an embodiment of the present invention. 4 is a perspective view of a liquid crystal display device including a liquid crystal cell. However, the present invention is not limited thereto. For example, the display device may be an organic light emitting display device including an organic light emitting layer, .

Referring to FIG. 4, the display device may include a polarizer including the optical film of the present invention. That is, the display device includes a display panel 200, a touch panel 100 disposed on one side of the display panel 200, and a polarizer 1 interposed between the display panel 200 and the touch panel 100, Wherein the polarizing plate 1 comprises a polarizer 30, a polarizer protective film 10 and 40 disposed on at least one side of the polarizer 30 and a hard coating layer 30 disposed on one side of the polarizer protective film 10, And the contact angle of the one surface of the hard coating layer 20 may be smaller than the contact angle of the other surface of the polarizer protective film 10 in a range of 0 to 40 degrees. The contact angle of the other surface of the polarizer protective film 10 may be in the range of 30 to 50 degrees or in the range of 38 to 50 degrees and the contact angle of the other surface of the polarizer protective film 10 may be in the range of 50 to 70 degrees Lt; / RTI >

The touch panel 100 is widely used as an input means for inputting information by reading a user's input operation as coordinate values. The touch panel 100 includes a polarizing plate A first substrate and a second substrate which are disposed on an upper portion of the substrate 1 and are spaced apart from each other by a predetermined distance. The first and second transparent electrodes may include first and second transparent electrodes formed on opposing surfaces of the first substrate and the second substrate, respectively.

A plurality of dot spacers having a height smaller than a distance between the first and second transparent electrodes may be formed on the first transparent electrode.

The first substrate of the touch panel 100 may be made of a transparent material so that a predetermined image provided from the display panel 200 can be transmitted and the second substrate may be formed of a flexible film, , Polyethylene terephthalic acid (PET), polycarbonate, or the like can be used.

The touch panel 100 may be classified into a contact type capacitance type, a pressure type resistive type, an infrared type, an integral type, a surface acoustic wave type, and a piezo type. We will briefly discuss the membrane type touch panel.

A pressure-type resistive touch panel is formed on two transparent substrates such that transparent electrodes having a resistance component are spaced apart from each other by a predetermined distance. When a current is supplied to the transparent electrode, a voltage is applied to each transparent electrode by a resistance component. When the contact is made by hand, the two transparent electrodes come into contact with each other. Therefore, due to the resistance component of the two transparent electrodes, the resistance value becomes the same as that of the parallel connection of the resistors. At this time, the voltage changes due to the current flowing through the two transparent electrodes, and the contact position can be known by the change of the voltage.

In addition, the touch panel can arrange the input pad of the touch panel, that is, the flexible printed circuit (FPC) up or down or left and right according to the product characteristics and structure of the customer, . Meanwhile, since the touch panel is well known in the related art, a more detailed description will be omitted.

The hard coating layer 20 may be disposed on a surface facing the touch panel 100. The contact angle range of the hard coating layer 20 may be a contact angle of the surface facing the touch panel 100 And satisfying the contact angle range, the adhesion between the touch panel 100 and the polarizing plate 1 can be more uniform.

The display device may further include an adhesive member 50 interposed between the touch panel 100 and the hard coating layer 20 of the polarizing plate 1 and the adhesive member 50 may be an optical clear adhesive adhesive: OCA) or an optical clear resin (OCR).

The adhesive member 50 is uniformly applied over the entire area of the hard coating layer 20, thereby firmly attaching the touch panel 100 to the polarizing plate. When the angle of contact between the touch panel 100 and the touch panel 100 is large, bubbles may be embedded in the adhesive member 50, thereby making it difficult to uniformly attach the touch panel to the polarizer, Which may cause problems such as deterioration of optical characteristics. The present invention can solve the above-described problems by forming the hard coating layer 20 that satisfies a specific range of contact angle on the surface facing the touch panel 100.

As shown in Fig. 4, when the display device is a liquid crystal display device, the polarizing plate can be disposed on both sides of the display panel 200. [ The polarizing plate 1 of the present invention may be disposed on the viewing side of the display panel 200 and may include a lower polarizer 300 at a position facing the backlight unit 400, Can be arranged.

The display panel 200 may be a liquid crystal cell. In this case, the display device may further include a backlight unit 400. [ In the case of a display device including a liquid crystal cell, a separate backlight unit is required because there is no separate light source in comparison with the OELD panel.

The liquid crystal cell may include a first substrate 210 and a second substrate 220 which are two substrates and a liquid crystal layer interposed between the first substrate 210 and the second substrate 220 230, and a liquid crystal driving electrode, a wiring pattern, a thin film transistor element, an alignment film, and the like are formed on the other substrate. .

The operation mode of the liquid crystal cell may be, for example, a twisted nematic mode or an electrically controlled birefringence mode. The birefringence control mode may include a vertical alignment method, an OCB (Optically Compensated) method, and an IPS (In-Plane Switching) method.

Meanwhile, the backlight unit 400 may include a light source, a light guide plate, and a reflective film. Depending on the configuration of the backlight, it can be arbitrarily divided into a direct-down system, a sidelight system, and a planar light source system.

4, when the polarizing plate is disposed on both surfaces of the display panel, the polarizing plate can transmit only the light that vibrates in a specific direction among the light incident from the light source of the backlight unit 400. [ Further, the polarizing plate may be included at a position opposite to the backlight unit of the liquid crystal cell. In this case, it may be located on the surface of the display panel, but is not limited thereto, and may be interposed between other components of the display device. That is, when the liquid crystal cell is disposed with the liquid crystal cell interposed therebetween, the transmission axis of the polarizing plate 1 on the upper side of the display panel 200 may be orthogonal to or parallel to the transmission axis of the lower polarizing plate 300.

Meanwhile, although not shown separately, when the display device is an organic light emitting display device, the display panel constituting the display device may include an OLED (Organic Light-Emitting Diode) panel. The OLED panel may include respective pixels, and each of the pixels may include an OLED composed of an organic light emitting layer between an anode and a cathode, and a pixel circuit that independently drives the OLED. The pixel circuit may mainly include a switching thin film transistor (TFT), a capacitor, and a driving TFT. The switching thin film transistor charges a data voltage in a capacitor in response to a scan pulse, and the driving TFT controls an amount of current supplied to the OLED according to a data voltage charged in the capacitor, thereby adjusting an amount of light emitted from the OLED, Can be displayed. On the other hand, OLED panels are well known in the related art and will not be described in detail.

The polarizer of the present invention may be disposed on the viewer side of the OLED panel. That is, the polarizer may be attached on the side where the viewer observes the image displayed from the OLED panel, and is disposed between the touch panel and the display panel, and the hard coating layer satisfying the specific contact angle standard is a surface facing the touch panel As shown in FIG.

Hereinafter, the present invention will be described with reference to concrete experimental data.

Example  1 to 4

A polarizer, a polarizer protective film and a hard coating layer were sequentially formed on the polarizing plate, and the OCA with a contact angle of 50 DEG was disposed between the hard coating layer and the touch panel. At this time, the contact angles of the hard coat layer were adjusted to 10 °, 25 °, 38 °, and 50 °, respectively, as shown in Table 1 below.

Comparative Example

The touch panel and the polarizing plate were laminated in the same manner as in the above embodiments, except that the contact angle of the hard coating layer was 70 °.

Experimental Example

The appearance after the polarizing plate and the touch panel of the examples and comparative examples were laminated was visually determined.

The peel strength was measured, and the peel strength was measured by the method specified in JIS 2107. Specifically, a pressure-sensitive adhesive was coated and dried to coat the base film so that the thickness of the pressure-sensitive adhesive layer became 5 占 퐉, and the sample was prepared under the condition of 35 占 폚 / 45RH%. The sample was cut into a size of 25 mm x 100 mm and laminated on a glass substrate. The adhesive layer and the glass substrate were connected to the upper and lower jig in a load cell of 30 kgf using a texture analyzer and peeled off at a pulling rate of 300 mm / min to measure the load at peeling off . The results are shown in Table 1 below.

In addition, the reworkability was measured. The reworkability was evaluated by measuring the peel strength of the specimen prepared in the oven at 50 DEG C for 4 hours, taking out the specimen, leaving it at room temperature for 120 hours, The pressure-sensitive adhesive layer was peeled off. The peeled specimen was then visually evaluated. In the evaluation criteria of the releasability, it means that the adhesive film does not remain on the glass substrate and the adhesive film is peeled off without damaging the polarizer, and the defect means that the adhesive film remains on the glass substrate, . The results are shown in Table 1 below.

Also, the endurance reliability was measured. The durability of the polarizing plate was 100 mm x 175 mm with a pressure-sensitive adhesive layer applied to both surfaces of the glass substrate, and a pressure of 4 to 5 kg / cm < 2 > At this time, a clean room operation was performed so that bubbles or foreign matter would not be generated.

The prepared specimens are allowed to stand at 25 ° C for 1 hour, and then the presence or absence of bubbles or peeling shall first be measured visually or microscopically. Thereafter, the moisture resistance characteristics were evaluated by observing whether bubbles or peeling occurred after standing for 500 hours under conditions of relative humidity of 60% and 90%.

The heat resistance was evaluated by observing whether bubbles or peeling occurred after being left at 85 ° C for 500 hours. The results are shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Comparative Example Hard Coating Layer Contact Angle (˚) 10 25 38 50 70 OCA contact angle (˚) 50 50 50 50 50 Appearance after touch panel and polarizer laminate Good Good Good Good Good Re-workability Good Good Good Good Good Peel strength
(Kgf / 25 mm) 630 550 450 400 320 Endurance reliability (heat resistance) △ △ ○ ○ △ Endurance Reliability (Humidity) ○ ○ ○ △ ×

In Table 1, & cir & means no bubbles or peeling, & cir & indicates a slight level of bubbles or peeling but a slight level, and X means that there are many bubbles or peeling.

As shown in Table 1, in the case of the polarizing plate satisfying the contact angle of the hard coating layer of the present invention, the touch panel and the polarizing plate can be adhered excellently, and bubbles or peeling do not occur or hardly occur even when the durability of the bubbles is tested for reliability can confirm.

It will be appreciated that the embodiments described above are all exemplary and that different embodiments may be applied in combination.

1: polarizer
10, 40: Polarizer protective film
15, 25: Adhesive layer
20: hard coat layer
30: Polarizer
35: Adhesive layer
50: Adhesive member
100: Touch panel
200: display panel
210: a first substrate
220: second substrate
230: liquid crystal layer
300: lower polarizer plate
400: Backlight unit

Claims (15)

delete delete delete delete delete A polarizer;
A protective film disposed on at least one side of the polarizer; And
And a hard coating layer disposed on one side of the protective film,
The contact angle of the one surface of the hard coating layer is smaller than the contact angle of the other surface of the protective film in a range of 0 to 40 degrees,
The contact angle of the one surface of the hard coat layer is 30 to 50 DEG,
The contact angle of the other surface of the protective film is in the range of 50 to 70,
The other surface of the protective film is adhered to one surface of the polarizer by an adhesive layer,
Wherein the protective film is an acrylic resin film. delete The method according to claim 6,
Wherein a contact angle of the one surface of the hard coat layer is in a range of 38 to 50 degrees. delete The method according to claim 6,
The protective film may be at least one selected from the group consisting of methyl acrylate, dipentaerythritol hexaacrylate, pentaerythritol triacrylate, polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate And at least one resin selected from the group consisting of silicone acrylate. Display panel;
A touch panel disposed on one surface of the display panel; And
And a polarizer interposed between the display panel and the touch panel,
Wherein the polarizer comprises a polarizer, a polarizer protective film disposed on at least one side of the polarizer, and a hard coating layer disposed on one side of the polarizer protective film,
The contact angle of the one surface of the hard coating layer is smaller than the contact angle of the other surface of the polarizer protective film in the range of 0 deg. To 40 deg.
The contact angle of the one surface of the hard coat layer is 30 to 50 DEG,
A contact angle of the other surface of the polarizer protective film is in the range of 50 to 70,
The other surface of the polarizer protective film is adhered to one surface of the polarizer by an adhesive layer,
Wherein the polarizer protective film is an acrylic resin film. delete 12. The method of claim 11,
Wherein a contact angle of the one surface of the hard coat layer is in a range of 38 DEG to 50 DEG. 12. The method of claim 11,
And the hard coating layer is disposed on a surface facing the touch panel. 15. The method of claim 14,
Further comprising an adhesive member interposed between the touch panel and the hard coating layer,
Wherein the adhesive member comprises an optical clear adhesive (OCA) or an optical clear resin (OCR).
KR1020150061641A 2015-04-30 2015-04-30 Optical film and polarizer plate comprising the same and display device comprising the polarizer plate KR101922284B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132105A1 (en) * 2005-06-08 2006-12-14 Konica Minolta Opto, Inc. Cellulose ester film, polarizing plate and liquid crystal display

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132105A1 (en) * 2005-06-08 2006-12-14 Konica Minolta Opto, Inc. Cellulose ester film, polarizing plate and liquid crystal display

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