WO2012064140A2 - 광학 소자 - Google Patents
광학 소자 Download PDFInfo
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- WO2012064140A2 WO2012064140A2 PCT/KR2011/008591 KR2011008591W WO2012064140A2 WO 2012064140 A2 WO2012064140 A2 WO 2012064140A2 KR 2011008591 W KR2011008591 W KR 2011008591W WO 2012064140 A2 WO2012064140 A2 WO 2012064140A2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
Definitions
- the present invention relates to an optical element and a stereoscopic image display device.
- the technique of dividing light into two or more kinds of light having different polarization states from each other can be usefully used in various fields.
- the light splitting technique may be applied to, for example, producing a stereoscopic image.
- Stereoscopic images may be implemented using binocular parallax. For example, when two two-dimensional images are respectively input to the left and right eyes of the human, the input information is transmitted and fused to the brain so that the human feels three-dimensional perspective and realism. Can be.
- the technology of generating stereoscopic images may be usefully used in 3D measurement, 3D TV, camera or computer graphics.
- An object of the present invention is to provide an optical element and a stereoscopic image display device.
- An exemplary optical element may include a liquid crystal layer and a polarizer, and the polarizer and the liquid crystal layer may be attached by an adhesive.
- an adhesive an adhesive having a glass transition temperature of 36 ° C. or more may be used.
- the term optical element may refer to any kind of optical instrument, optical component or optical device or the like that exhibits one or more optically intended functions.
- the optical element may mean that the sheet or film has a form.
- the optical element may be, for example, an element that divides incident light into two or more kinds of light having different polarization states. Such a device may be used, for example, to implement a stereoscopic image.
- the polarizer included in the optical element is a functional element capable of extracting light vibrating in one direction from incident light while vibrating in various directions.
- a conventional polarizer such as a poly (vinyl alcohol) polarizer can be used.
- the polarizer may be a polyvinyl alcohol film or sheet on which dichroic dyes or iodine are adsorbed and oriented.
- the polyvinyl alcohol can be obtained, for example, by gelling polyvinylacetate.
- polyvinyl acetate Homopolymer of vinyl acetate; And copolymers of vinyl acetate and other monomers, and the like.
- As another monomer copolymerized with vinyl acetate one or more kinds of unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfonic acid compounds and acrylamide compounds having an ammonium group may be exemplified.
- the degree of gelation of polyvinylacetate may generally be about 85 mol% to about 100 mol% or 98 mol% to 100 mol%.
- the degree of polymerization of the polyvinyl alcohol used in the polarizer may generally be about 1,000 to about 10,000 or about 1,500 to about 5,000.
- the optical element includes a liquid crystal layer attached to the polarizer by an adhesive.
- FIG. 1 is sectional drawing of the exemplary optical element 1, Comprising: The structure which the polarizer 11 and the liquid crystal layer 13 adhered by the adhesive agent 12 is shown.
- the liquid crystal layer may be a phase delay layer having a phase delay property.
- the liquid crystal layer may include a polymerizable liquid crystal compound, and the compound may be included in the liquid crystal layer in a polymerized form.
- the term "polymerizable liquid crystal compound” may mean a compound containing a site capable of exhibiting liquid crystallinity, for example, a mesogen skeleton, and the like, and further including at least one polymerizable functional group.
- the polymerizable liquid crystal compound is included in a polymerized form may mean a state in which the liquid crystal compound is polymerized to form a skeleton such as a main chain or side chain of the liquid crystal polymer in the liquid crystal layer.
- the liquid crystal layer may further include a polymerizable liquid crystal compound in a non-polymerized state, or may further include a known additive such as a polymerizable non-liquid crystal compound, a stabilizer, a non-polymerizable non-liquid crystal compound, or an initiator.
- the polymerizable liquid crystal compound included in the liquid crystal layer may include a polyfunctional polymerizable liquid crystal compound and a monofunctional polymerizable liquid crystal compound.
- polyfunctional polymerizable liquid crystal compound may mean a compound containing two or more polymerizable functional groups in the liquid crystal compound.
- the multifunctional polymerizable liquid crystal compound has 2 to 10, 2 to 8, 2 to 6, 2 to 5, 2 to 4, 2 to 3 polymerizable functional groups Or two.
- the term "monofunctional polymerizable liquid crystal compound” can mean the compound containing one polymerizable functional group among the said liquid crystal compounds.
- the phase retardation characteristics of the liquid crystal layer can be effectively controlled, and the phase retardation characteristics implemented, for example, the optical axis of the phase retardation layer and the phase retardation value can be stably maintained.
- the term optical axis may mean a slow axis or fast axis when light passes through a corresponding area.
- the liquid crystal layer is a monofunctional polymerizable liquid crystal compound, more than 0 parts by weight to 100 parts by weight, 1 part by weight to 90 parts by weight, 1 part by weight to 80 parts by weight, 1 part by weight relative to 100 parts by weight of the polyfunctional polymerizable liquid crystal compound.
- To 70 parts by weight 1 to 60 parts by weight, 1 to 50 parts by weight, 1 to 30 parts by weight or 1 to 20 parts by weight.
- the mixing effect of the multifunctional and monofunctional polymerizable liquid crystal compound may be maximized, and the liquid crystal layer may exhibit excellent adhesiveness with the adhesive layer.
- the unit weight part may mean a ratio of weight.
- the optical element may satisfy the condition of the following general formula (1).
- X is a percentage of the absolute value of the change amount of the phase difference value of the liquid crystal layer after leaving the optical element at 80 ° C. for 100 hours or 250 hours at an initial phase difference value of the liquid crystal layer of the optical element.
- X may be calculated as, for example, "100 x (
- R 0 is the initial phase difference value of the liquid crystal layer of the optical element
- R 1 means the phase difference value of the liquid crystal layer after leaving the optical element at 80 ° C. for 100 hours or 250 hours.
- X may preferably be 7% or less, 6% or less or 5% or less.
- the amount of change in the phase difference value can be measured by the method given in the following Examples.
- the multifunctional or monofunctional polymerizable liquid crystal compound may be a compound represented by the following Chemical Formula 1.
- A is a single bond, -COO- or -OCO-
- R 1 to R 10 are each independently hydrogen, halogen, alkyl group, alkoxy group, alkoxycarbonyl group, cyano group, nitro group, -OQP or Substituent of Formula 2, wherein at least one of R 1 to R 10 is -OQP or a substituent of Formula 2, two adjacent substituents of R 1 to R 5 or two adjacent substituents of R 6 to R 10 Connected to each other to form a benzene substituted with -OQP, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group, methacryloyl group, acrylo It is a polymerizable functional group, such as a oxy group or a methacryloyl oxy group.
- B is a single bond, -COO- or -OCO-, and R 11 to R 15 are each independently hydrogen, halogen, alkyl group, alkoxy group, alkoxycarbonyl group, cyano group, nitro group or -OQP.
- At least one of R 11 to R 15 is -OQP, or two adjacent substituents of R 11 to R 15 are connected to each other to form a benzene substituted with -OQP, wherein Q is an alkylene group or an alkylidene group , P is a polymerizable functional group such as alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group.
- adjacent two substituents may be linked to each other to form benzene substituted with -OQP, which may mean that two adjacent substituents are connected to each other to form a naphthalene skeleton substituted with -OQP as a whole. have.
- single bond refers to a case where no separate atom is present in a portion represented by A or B.
- A is a single bond in Formula 1
- benzene on both sides of A may be directly connected to form a biphenyl structure.
- alkyl group is a straight or branched chain alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, or 3 to 20 carbon atoms, It may mean a cycloalkyl group having 3 to 16 carbon atoms or 4 to 12 carbon atoms.
- the alkyl group may be optionally substituted with one or more substituents.
- alkoxy group may mean an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms.
- the alkoxy group may be linear, branched or cyclic.
- the alkoxy group may be optionally substituted with one or more substituents.
- alkylene group or alkylidene group may mean an alkylene group or alkylidene group having 1 to 12 carbon atoms, 4 to 10 carbon atoms or 6 to 9 carbon atoms, unless otherwise specified.
- the alkylene group or alkylidene group may be linear, branched or cyclic.
- the alkylene group or alkylidene group may be optionally substituted with one or more substituents.
- an alkenyl group in the present specification may mean an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms, unless otherwise specified.
- the alkenyl group may be linear, branched or cyclic.
- the alkenyl group may be optionally substituted with one or more substituents.
- P is preferably acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group, more preferably acryloyloxy group or methacryloyloxy group, More preferably, it may be an acryloyloxy group.
- an alkyl group, an alkoxy group, an alkenyl group, an epoxy group, an oxo group, an oxetanyl group, a thiol group, a cyano group, a carboxyl group, acryloyl group, a methacryloyl group, Acryloyloxy group, methacryloyloxy group or an aryl group may be exemplified, but is not limited thereto.
- At least one of -OQP or a residue of Formula 2, which may be present in Formulas 1 and 2, may be, for example, present at a position of R 3 , R 8, or R 13 .
- it may be preferably R 3 and R 4 or R 12 and R 13 to be connected to each other to form a benzene substituted with -OQP.
- substituents other than -OQP or residues of the formula (2) or substituents other than those linked to each other to form benzene in the compound of the formula (1) or the formula (2) are hydrogen, halogen, straight chain of 1 to 4 carbon atoms Or an alkoxycarbonyl group including a branched alkyl group, a straight or branched alkoxy group having 1 to 4 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, a cyano group, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, Preferably an alkoxycarbonyl group comprising chlorine, a straight or branched chain alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a straight or branched chain alkoxy group having 1 to 4 carbon atoms, or It may be a
- the polymerizable liquid crystal compound may be included in a horizontally aligned liquid crystal layer, and may be polymerized in the alignment state.
- horizontal alignment means that the optical axis of the liquid crystal layer containing the polymerized liquid crystal compound is about 0 degrees to about 25 degrees, about 0 degrees to about 15 degrees, and about 0 degrees to about 10 with respect to the plane of the liquid crystal layer. Also, it may mean a case having an inclination angle of about 0 degrees to about 5 degrees or about 0 degrees.
- optical axis may mean a fast axis or a slow axis when incident light passes through a corresponding area.
- the liquid crystal layer may have a difference in refractive index in the in-plane slow axis direction and in-plane fast axis direction in a range of 0.05 to 0.2, 0.07 to 0.2, 0.09 to 0.2, or 0.1 to 0.2.
- the refractive index in the in-plane slow axis direction refers to the refractive index in the direction showing the highest refractive index in the plane of the liquid crystal layer
- the refractive index in the fast axis direction indicates the difference in the refractive index in the direction showing the lowest refractive index on the plane of the liquid crystal layer. Can mean.
- the fast axis and the slow axis are formed in a direction perpendicular to each other.
- Each of the refractive indices may be a refractive index measured for light having a wavelength of 550 nm or 589 nm.
- the liquid crystal layer may also have a thickness of about 0.5 ⁇ m to 2.0 ⁇ m or about 0.5 ⁇ m to 1.5 ⁇ m.
- the liquid crystal layer having the relationship and thickness of the refractive index may implement a phase delay characteristic suitable for the application to be applied.
- the liquid crystal layer having a relationship between the refractive index and the thickness may be suitable for an optical element for splitting light.
- the liquid crystal layer may be formed to split incident light, for example, light incident through the polarizer into two or more types of light having different polarization states.
- the liquid crystal layer may include first and second regions having different phase delay characteristics from each other.
- the phase delay characteristics of the first region and the second region are different from each other, wherein the first and second regions are the same as or different from each other in a state in which both the first and second regions have a phase delay characteristic. It may include a case where the optical axis is formed in the direction and the phase delay values are also different from each other, and the case where the optical axes are formed in different directions while having the same phase delay value.
- the difference in phase delay characteristics of the first and second regions means that any one of the first and second regions is a region having phase delay characteristics, and the other region is optically isotropic without phase delay characteristics.
- the case may also be included. Examples of such a case include a form in which the liquid crystal layer includes both the region in which the liquid crystal layer is formed and the region in which the liquid crystal layer is not formed.
- the phase delay characteristics of the first or second region may be controlled by adjusting, for example, the alignment state of the liquid crystal compound, the refractive index relationship of the liquid crystal layer, or the thickness of the liquid crystal layer.
- first region A and the second region B are alternately disposed adjacent to each other while having a stripe shape extending in a common direction as shown in FIG. 2, or FIG. 3. As shown in Fig. 1 may be arranged alternately adjacent to each other in a grid pattern.
- any one of the first and second regions may be a left eye image signal polarization adjusting region (hereinafter referred to as an "LC region”),
- the other region may be a right eye image signal polarization adjusting region (hereinafter, may be referred to as an “RC region”).
- the two or more kinds of light having different polarization states, divided by the liquid crystal layer including the first and second regions include two kinds of linearly polarized light having directions substantially perpendicular to each other. Or, may include left circularly polarized light and right circularly polarized light.
- each of the above means substantially vertical, horizontal, orthogonal or parallel, unless otherwise specified, for example , Error including manufacturing error or variation.
- each of the above may include an error within about ⁇ 15 degrees, preferably an error within about ⁇ 10 degrees, more preferably an error within about ⁇ 5 degrees.
- any one of the first and second regions is a region which is transmitted as it is without rotating the polarization axis of the incident light, and the other region is orthogonal to the polarization axis of the light transmitted through the other region. It may be a region that can be transmitted by rotating in the direction.
- the region containing the polymerizable liquid crystal compound in the liquid crystal layer may be formed only in one of the first and second regions.
- the region in which the liquid crystal layer is not formed may be an empty space, or a resin layer or a resin film or sheet having glass or optical isotropy may be formed.
- one of the first and second regions may be a region capable of converting incident light into left circularly polarized light and transmitting the light, and another region may be an region capable of converting incident light into right circularly polarized light and transmitting the light.
- the first and second regions are regions having optical axes formed in different directions while exhibiting the same phase retardation values, or one region is a region capable of delaying incident light by a quarter wavelength of the wavelength.
- the other area may be an area capable of retarding incident light by 3/4 wavelength of the wavelength.
- the first and second regions have a phase retardation value equal to each other, for example, a value capable of retarding incident light by a quarter wavelength of the wavelength, and formed in different directions from each other. It may be an area having an optical axis. The angle formed by the optical axes formed in different directions as described above may be vertical, for example.
- first and second regions are regions having optical axes formed in different directions
- a line bisecting an angle formed by the optical axes of the first and second regions is formed to be perpendicular or horizontal to the absorption axis of the polarizer. It is preferable that it is done.
- FIG. 4 is an exemplary view for explaining the arrangement of the optical axes when the first and second regions A and B in the example of FIG. 2 or 3 are regions having optical axes formed in different directions from each other.
- a line that bisects the angle formed by the optical axes of the first and second regions A and B may mean a line that bisects the angle of ( ⁇ 1 + ⁇ 2).
- the bisector may be formed in a direction parallel to the boundary line L of the first and second regions A and B.
- the angle formed by the optical axes of the first and second regions, that is, ( ⁇ 1 + ⁇ 2) may be, for example, 90 degrees.
- the optical element may further include a base layer formed on the side opposite to the adhesive layer side of the liquid crystal layer.
- the substrate layer may be a substrate layer on which a liquid crystal layer is formed.
- the base material layer may have a single layer or a multilayer structure.
- the liquid crystal layer may be attached to the polarizer by the adhesive.
- FIG. 5 is a diagram exemplarily showing an optical element 5 that further includes a base layer 51.
- a glass base material layer or a plastic base material layer can be used, for example.
- the plastic base layer include cellulose resins such as triacetyl cellulose (TAC) or diacetyl cellulose (DAC); Cyclo olefin polymers (COPs) such as norbornene derivatives; Acrylic resins such as poly (methyl methacrylate); polyolefin (PC); polyolefins such as polyethylene (PE) or polypropylene (PP); polyvinyl alcohol (PVA); poly ether sulfone (PES); polyetheretherketon (PEEK); Polyetherimide (PEN), polyestermaphthatlate (PEN), polyester such as polyethylene terephtalate (PET), polyimide (PI), polysulfone (PSF), or a fluorine resin or the like may be exemplified.
- TAC triacetyl cellulose
- DAC diacetyl cellulose
- COPs Cyclo olefin polymers
- the substrate layer for example, the plastic substrate layer, may have a lower refractive index than the liquid crystal layer.
- the refractive index of the exemplary substrate layer is in the range of about 1.33 to about 1.53.
- the base layer has a lower refractive index than the liquid crystal layer, for example, it is advantageous to improve luminance, prevent reflection, and improve contrast characteristics.
- the plastic base layer may be optically isotropic or anisotropic.
- the base layer is optically anisotropic in the above, it is preferable that the optical axis of the base layer is disposed so as to be perpendicular or horizontal to a line bisecting the angle formed by the optical axes of the first and second regions.
- the substrate layer may include a sunscreen or a UV absorber.
- a sunscreen or absorbent When the sunscreen or absorbent is included in the base layer, deterioration of the liquid crystal layer due to ultraviolet rays or the like can be prevented.
- a salicylic acid ester compound, a benzophenone compound, an oxybenzophenone compound, a benzotriazol compound, a cyanoacrylate compound or a benzoate Organics such as (benzoate) compounds or the like or inorganic materials such as zinc oxide or nickel complex salts may be exemplified.
- the content of the sunscreen or absorbent in the substrate layer is not particularly limited and may be appropriately selected in consideration of the desired effect.
- the sunscreen or absorbent may be included in the manufacturing process of the plastic base layer in an amount of about 0.1 wt% to 25 wt% based on the weight ratio of the main material of the base layer.
- the thickness of the substrate layer is not particularly limited and may be appropriately adjusted according to the intended use.
- the base material layer may have a single layer or a multilayer structure.
- An exemplary optical element may further include an alignment layer existing between the base layer and the liquid crystal layer.
- the alignment layer may be a layer that serves to orient the liquid crystal compound in the process of forming the optical element.
- a conventional alignment layer known in the art for example, a photo alignment layer or a rubbing alignment layer may be used.
- the alignment layer is an arbitrary configuration, and in some cases, it is possible to impart orientation without the alignment layer by rubbing or stretching the substrate layer directly.
- the substrate layer may also be provided with a surface treatment layer.
- 6 exemplarily shows an element 6 in which the surface treatment layer 61 is formed on the surface of the substrate layer 51.
- the surface treatment layer may be formed on one main surface of the base layer as shown in FIG. 6, or may be formed on both main surfaces, and if necessary, may be performed on the entire surface including the side surface of the base layer.
- the surface treatment layer examples include an anti-glare layer such as a high hardness layer, an anti-glare layer or a semi-glare layer, or a low reflection layer such as an anti reflection layer or a low reflection layer. Can be.
- the high hardness layer may be a layer having a pencil hardness of at least 1H or at least 2H under a load of 500 g.
- the pencil hardness can be measured according to the ASTM D 3363 standard, for example using a pencil lead defined in KS G2603.
- the high hardness layer may be, for example, a high hardness resin layer.
- the resin layer may include, for example, a room temperature curing type, a moisture curing type, a thermosetting type, or an active energy ray curing type resin composition in a cured state, and in one example, a thermosetting type or active energy ray curing type resin composition, or The active energy ray curable resin composition may be included in a cured state.
- the "cured state" may mean a case where the components contained in the respective resin compositions are converted into a hard state through a crosslinking reaction or a polymerization reaction.
- the cured state may be induced at room temperature or may be induced by application of heat or irradiation of active energy ray in the presence of appropriate moisture.
- composition may be meant.
- the resin composition may include an acrylic compound, an epoxy compound, a urethane-based compound, a phenol compound, a polyester compound, or the like as a main material.
- the "compound” may be a monomeric, oligomeric or polymeric compound.
- an acrylic resin composition which is excellent in optical properties such as transparency and excellent in resistance to yellowing and the like, preferably an active energy ray-curable acrylic resin composition can be used.
- the active energy ray-curable acrylic composition may include, for example, an active energy ray polymerizable polymer component and a monomer for reactive dilution.
- the polymer component in the above includes components known in the art as so-called active energy ray polymerizable oligomers such as urethane acrylate, epoxy acrylate, ether acrylate or ester acrylate, or monomers such as (meth) acrylic acid ester monomers and the like. Polymerized mixtures can be exemplified. As the (meth) acrylic acid ester monomer, alkyl (meth) acrylate, (meth) acrylate having an aromatic group, heterocyclic (meth) acrylate or alkoxy (meth) acrylate and the like can be exemplified. In this field, various polymer components for producing an active energy ray-curable composition are known, and such compounds may be selected as necessary.
- the monomer for reactive dilution which may be included in the active energy ray-curable acrylic composition
- a monomer having one or two or more active energy ray-curable functional groups for example, acryloyl group or methacryloyl group
- the (meth) acrylic acid ester monomer or polyfunctional acrylate may be used.
- the selection of the above components or the blending ratio of the selected components for producing the active energy ray-curable acrylic composition is not particularly limited and may be adjusted in consideration of the hardness and other physical properties of the desired resin layer.
- the AG (Anti-glare) layer or the SG (Semi-glare) layer for example, a resin layer containing a resin layer or particles having an uneven surface formed therein, the particles having a refractive index different from that of the resin layer.
- grain can be used.
- the resin layer used for formation of the said high hardness layer can be used, for example.
- an anti-glare layer although it is not necessary to adjust the component of a resin composition so that a resin layer may show high hardness, you may form a resin layer so that a high hardness may be shown.
- the method of forming the uneven surface on the resin layer is not particularly limited.
- the resin layer may be cured in a state in which the coating layer of the resin composition is in contact with a mold having a desired concave-convex structure, or a particle having an appropriate particle size may be blended, coated, and cured in the resin composition to implement the concave-convex structure. Can be.
- the anti-glare layer may also be implemented using particles having a different refractive index than that of the resin layer.
- the particles for example, the difference in refractive index with the resin layer may be 0.03 or less or 0.02 to 0.2. If the difference in the refractive index is too small, it is difficult to cause haze, and if the difference is too large, scattering occurs in the resin layer to increase the haze, but a decrease in light transmittance or contrast characteristics may be induced. Consideration can be given to selecting appropriate particles.
- the shape of the particles contained in the resin layer is not particularly limited and may have, for example, spherical, elliptical, polyhedral, amorphous or other shapes.
- the particles may have an average diameter of 50 nm to 5,000 nm.
- corrugation is formed in the surface can be used as said particle
- Such particles may, for example, have an average surface roughness Rz of 10 nm to 50 nm or 20 nm to 40 nm, and / or a maximum height of irregularities formed on the surface of about 100 nm to 500 nm or 200 nm to 400 nm, and the width of the unevenness may be 400 nm to 1,200 nm or 600 nm to 1,000 nm.
- Such particles are excellent in compatibility with the resin layer or dispersibility therein.
- the particles various inorganic or organic particles can be exemplified.
- the inorganic particles include silica, amorphous titania, amorphous zirconia, indium oxide, alumina, amorphous zinc oxide, amorphous cerium oxide, barium oxide, calcium carbonate, amorphous barium titanate or barium sulfate, and the like.
- the organic particles may include particles including a crosslinked or non-crosslinked material of an organic material such as an acrylic resin, a styrene resin, a urethane resin, a melamine resin, a benzoguanamine resin, an epoxy resin, or a silicone resin, but are not limited thereto. It is not.
- the content of the uneven structure or the particles formed in the resin layer is not particularly limited.
- the shape of the uneven structure or the content of the particles for example, in the case of the AG layer, so that the haze (haze) of the resin layer is about 5% to 15%, 7% to 13% or about 10%
- the haze may be adjusted to be about 1% to 3%.
- the haze may be measured according to a manufacturer's manual using a hazemeter such as Sepung's HR-100 or HM-150.
- the low reflection layer such as an anti reflection (AR) layer or a low reflection (LR) layer, may be formed by coating a low refractive material.
- a low refractive material There are a variety of low refractive materials that can form a low reflection layer, all of which may be appropriately selected and used in the optical element.
- the low reflection layer may be formed such that the reflectance is about 1% or less through the coating of the low refractive material.
- the surface treatment layer may be formed alone or in combination of two or more thereof.
- the case where the high hardness layer is first formed on the surface of the base material layer and the low reflection layer is formed again on the surface thereof can be exemplified.
- the polarizer and the liquid crystal layer are attached to each other by an adhesive.
- the adhesive may have a glass transition temperature of 36 ° C., 37 ° C., 38 ° C., 39 ° C., 40 ° C., 50 ° C., 60 ° C., 70 ° C., 80 ° C., or 90 ° C. or more.
- the adhesive may stably maintain the phase retardation characteristics of the liquid crystal layer.
- the upper limit of the glass transition temperature is not particularly limited, but may be, for example, about 200 ° C, about 150 ° C, or about 120 ° C.
- the adhesive may also be up to 6 ⁇ m, up to 5 ⁇ m, or up to 4 ⁇ m. At such a thickness, the adhesion with the liquid crystal layer and the durability of the phase retardation characteristic of the liquid crystal layer can be properly maintained.
- the lower limit of the thickness of the adhesive may be, for example, 0.1 ⁇ m, 0.3 ⁇ m, or 0.5 ⁇ m.
- the adhesive may be an active energy ray curable adhesive. That is, the adhesive may include an adhesive composition cured by irradiation of active energy rays.
- curing may refer to a process of inducing physical or chemical action or reaction of components included in the composition to express adhesiveness.
- active energy ray hardening type can mean the adhesive or adhesive composition of the type in which hardening
- active energy rays microwaves, infrared rays (IR), ultraviolet rays (UV), X-rays and gamma rays, as well as alpha-particle beams, proton beams, Particle beams such as neutron beams or electron beams can be included, and typically ultraviolet or electron beams can be used.
- the adhesive may include a radical polymerizable compound or a cationic polymerizable compound, which may be included in a polymerized form.
- the radically polymerizable compound may mean a compound which is polymerized by a radical reaction, for example, a radical reaction by irradiation of an active energy ray, to form an adhesive
- the cationically polymerizable compound is a cationic reaction, for example.
- it may mean a compound that is polymerized by a cationic reaction by irradiation of active energy rays to form an adhesive.
- Each compound may be included in an adhesive composition to form an adhesive through a curing reaction of the composition.
- the adhesive composition may include only one kind of a radical polymerizable compound or a cationic polymerizable compound, or may include both kinds.
- Examples of the cationically polymerizable compound include an epoxy compound, a vinyl ether compound, an oxetane compound, an oxolane compound, a cyclic acetal compound, a cyclic lactone compound, a thiirane compound, a thiovinyl ether compound, and a spirosoo ester ( spirortho ester) compounds, ethylenically unsaturated compounds, cyclic ether compounds or cyclic thioether compounds and the like can be exemplified, and epoxy compounds can be preferably used.
- an epoxy resin As a cationically polymerizable epoxy compound, an epoxy resin, an alicyclic epoxy compound, an aliphatic epoxy compound, an aromatic epoxy compound, etc. can be illustrated.
- the epoxy resin in the above cresol novolac type epoxy resin or phenol novolak type epoxy resin and the like can be exemplified.
- the epoxy resin may have a weight average molecular weight (M w ) in the range of 1000 to 5000 or 2000 to 4000.
- M w weight average molecular weight
- the weight average molecular weight means a conversion value with respect to standard polystyrene measured by GPC (Gel Permeation Chromatograph), and unless otherwise specified, the term "molecular weight” means "weight average molecular weight”.
- the alicyclic epoxy compound may mean a compound including at least one alicyclic epoxy group.
- the term alicyclic epoxy group refers to a functional group having an aliphatic saturated hydrocarbon ring in which the two carbon atoms constituting the ring also constitute an epoxy group.
- Epoxycyclohexylmethyl epoxycyclohexane carboxylate type compound For example, Epoxycyclohexane carboxylate type compound; Epoxycyclohexane carboxylate compounds of alkanediols; Epoxy cyclohexylmethyl ester compounds of dicarboxylic acids; Epoxycyclohexylmethyl ether compounds of polyethylene glycol; Epoxycyclohexylmethyl ether compounds of alkanediols; Diepoxy citris-pyro compounds; Diepoxy monospiro compounds; Vinylcyclohexene diepoxide compound; Epoxycyclopentyl ether compounds or diepoxy tricyclo decane compounds and the like can be exemplified, specifically, 7-oxabicyclo [4,1,0] heptan-3-carboxylic acid and (7-oxa-bicyclo [4, 1,0] hepto-3-yl) methanol; Ester of 4-methyl-7-oxabicyclo [4,1,
- alicyclic epoxy compound as a bifunctional epoxy compound, that is, a compound having two epoxy, a compound in which the two epoxy groups are both alicyclic epoxy groups can be used.
- the epoxy compound which has an aliphatic epoxy group other than an alicyclic epoxy group can be illustrated.
- polyglycidyl ether of aliphatic polyhydric alcohol Polyglycidyl ethers of alkylene oxide adducts of aliphatic polyhydric alcohols; Polyglycidyl ethers of polyester polyols of aliphatic polyhydric alcohols and aliphatic polyhydric carboxylic acids; Polyglycidyl ethers of aliphatic polyvalent carboxylic acids; Polyglycidyl ethers of polyester polycarboxylic acids of aliphatic polyhydric alcohols and aliphatic polyhydric carboxylic acids; Dimers, oligomers or polymers obtained by vinyl polymerization of glycidyl acrylate or glycidyl methacrylate; Or oligomers or polymers obtained by vinyl polymerization of glycidyl acrylate or glycidyl meth
- aliphatic polyhydric alcohol for example, an aliphatic polyhydric alcohol having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms or 2 to 4 carbon atoms may be exemplified.
- Ethylene glycol 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,4-butanediol, neo Pentyl glycol, 3-methyl-2,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol, 2,4-diethyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 3,5-heptanediol, 1,8-octanediol, 2-methyl-1,8- Aliphatic diols such as octanediol, 1,9-nonane
- alkylene oxide of 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms can be exemplified, for example, ethylene jade Seeds, propylene oxide or butylene oxide and the like can be used.
- aliphatic polyhydric carboxylic acid for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, subberic acid, azelaic acid, sebacic acid, dodecaneic acid, 2-methyl succinic acid , 2-methyl adipic acid, 3-methyl adipic acid, 3-methylpentaneic acid, 2-methyloctanoic acid, 3,8-dimethyldecane diacid, 3,7-dimethyldecane diacid, 1,20-eicosamethylene Dicarboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1 , 4-cyclohexanedicarboxylic acid, 1,4-dicarboxymethylenecyclohexane, 1,2,
- aliphatic epoxy compound it is appropriate to use a compound which does not include an alicyclic epoxy group and also contains three or more epoxy groups, preferably three epoxy groups, in consideration of curability, weather resistance and refractive index characteristics, but is not limited thereto. It is not.
- aromatic epoxy compound As an epoxy compound containing an aromatic group in a molecule
- Bisphenol-type epoxy resins such as bisphenol A type
- Novolac type epoxy resins such as phenol novolac type epoxy resins or cresol novolac type epoxy resins
- a silane compound having a cationic polymerizable functional group may also be exemplified, and such a compound may be used as a component capable of improving the adhesive force by adjusting the surface energy of the adhesive, for example.
- a silane compound the compound represented by following formula (3) can be used, for example.
- R 1 is a cationically polymerizable functional group bonded to a silicon atom
- R 2 is a hydrogen, hydroxy group, alkyl group or alkoxy group as a functional group bonded to a silicon atom
- n is a number from 1 to 4.
- a cyclic ether group or a vinyloxy group such as glycidyl group or oxetanyl group or the like or a functional group including the cyclic ether group or vinyloxy group may be exemplified.
- N in the general formula (3) may be preferably 1 or 2.
- silane compound an oligomer type silane compound in which the above-mentioned cationically polymerizable functional group is introduced into a molecule of a siloxane oligomer which is a low molecular weight silicone resin in which the terminal of the molecular chain is sealed with an alkoxysilyl group can also be used.
- the compound which has a radically polymerizable functional group such as an acryloyl group or a methacryloyl group, can superpose
- polymerize and form an adhesive agent can be used.
- the radically polymerizable compound may be an acrylamide-based compound.
- the acrylamide-based radically polymerizable compound include compounds represented by the following general formula (4).
- R 1 and R 2 are each independently hydrogen, an alkyl group, or a hydroxyalkyl group, or R 1 and R 2 are connected to form a heterocyclic structure including nitrogen, and R 3 is hydrogen or an alkyl group.
- heterocyclic structure may mean a cyclic compound including at least two or more different atoms as ring constituent atoms, unless otherwise specified.
- the heterocyclic structure may include, for example, 3 to 20, 3 to 16, 3 to 12, or 3 including nitrogen of Formula 1 to which R 1 and R 2 are linked. It may contain from 8 to 8 ring constituent atoms. Examples of atoms that may be included in the heterocyclic structure in addition to the nitrogen may include carbon, oxygen, or sulfur, and additional nitrogen atoms other than the nitrogen of Formula 4 to which the R 1 and R 2 are connected as long as the heterocyclic structure is formed. It may also include.
- the heterocyclic structure may not include an unsaturated bond such as a carbon carbon double bond, may include one or more as necessary, and may be optionally substituted by one or more substituents.
- Examples of the compound of formula 4 include (meth) acrylamide, N-alkyl acrylamide, N-hydroxyalkyl (meth) acrylamide, N-acryloyl morpholine, and the like, but are not limited thereto.
- the compound containing a heterocyclic acetal structure can also be illustrated.
- heterocyclic acetal structure may mean a heterocyclic structure including a structure in which two oxygen atoms are bonded to one same carbon atom by a single bond. That is, the compound may be a compound including a functional group including a heterocyclic acetal structure and the radical polymerizable functional group at the same time.
- the compound may, for example, serve as a diluent for adjusting the viscosity of the composition, and may also be used to improve adhesion with the liquid crystal layer.
- the heterocyclic acetal structure may include 4 to 20, 4 to 16, 4 to 12, or 4 to 8 ring constituent atoms, and may be optionally substituted by one or more substituents. have.
- the radically polymerizable compound may include a monovalent moiety derived from the compound of Formula 5 or 6 together with the radical polymerizable functional group.
- R 4 and R 5 each independently represent a hydrogen or an alkyl group
- Q, P, R and T are each independently a carbon atom or an oxygen atom
- two of Q, P, R and T are It is an oxygen atom
- a and B respectively independently represent a C1-C5 alkylene group or an alkylidene group.
- a compound represented by the following Chemical Formula 7 may be exemplified.
- R 6 represents hydrogen or an alkyl group
- R 7 is an alkyl group substituted with a monovalent residue or the monovalent residue derived from the structure of Formula 5 or 6 above.
- (2-ethyl-2-methyl-1,3-dioxolan-4yl) methyl acrylate ((2-ethyl-2-methyl-1,3-dioxolane-4 -yl) methyl acylate), (2-isobutyl-2-methyl-1,3-dioxolan-4-yl) methylacrylate ((2-isobutyl-2-methyl-1,3-dioxolane-4- yl) methyl acylate) or (1,4-dioxaspiro [4,5] dec-2-yl) methyl acrylate ((1,4-dioxaspiro [4,5] dec-2-yl) methyl acylate)
- This may be illustrated, but is not limited thereto.
- the monomer represented by either of the following general formula (8-10) can also be illustrated.
- R is hydrogen or an alkyl group
- A, B, T, U and W are each independently an alkylene group or an alkylidene group
- Q is an alkyl group or an aryl group
- n is a number of 0 to 5 to be.
- aryl group may mean a monovalent moiety derived from a compound or derivative thereof including benzene or a structure including two or more benzenes condensed or bonded.
- the aryl group may be, for example, an aryl group having 6 to 22 carbon atoms, preferably 6 to 16 carbon atoms, more preferably 6 to 13 carbon atoms, and for example, a phenyl group, a phenylethyl group, a phenylpropyl group, and a benzyl group.
- N in the formula (8) may be more preferably a number of 0 to 3, even more preferably 0 to 2.
- 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate , 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate and the like can be exemplified, but is not limited thereto.
- T may preferably be an alkylene group having 1 to 4 carbon atoms
- ⁇ -carboxyethyl (meth) acrylate may be exemplified.
- Q may be an alkyl group having 1 to 4 carbon atoms
- U and W may each independently be an alkylene group having 1 to 4 carbon atoms.
- Such compounds include, but are not limited to, 2- (2-ethoxyethoxy) ethyl (meth) acrylate.
- the radically polymerizable compound may also be exemplified by the compound represented by the following formula (11), and such a compound may be used, for example, for improving the durability of the adhesive.
- R is hydrogen or an alkyl group
- P is a monovalent moiety derived from an aliphatic saturated hydrocarbon cyclic compound.
- the monovalent moiety may mean an aliphatic saturated hydrocarbon cyclic compound, specifically, a compound having a carbon atom bonded in a ring shape, and a monovalent moiety derived from a compound other than an aromatic compound or a derivative thereof.
- the aliphatic saturated hydrocarbon cyclic compound may be an aliphatic saturated hydrocarbon cyclic compound having 3 to 20 carbon atoms, preferably 6 to 15 carbon atoms, more preferably 8 to 12 carbon atoms.
- Examples of the monovalent moiety include isobornyl, cyclohexyl, norbornanyl, norbornenyl, norbornenyl, dicyclopentadienyl, ethynylcyclohexane, ethynylcyclohexene or An ethynyl decahydro naphthalene group and the like can be exemplified.
- an isobornyl group can be used, but is not limited thereto.
- an isocyanate functional acrylic ester compound may also be used.
- the compound is not particularly limited as long as it contains an isocyanate group and an acryl group at the same time.
- an isocyanate-functional aliphatic acrylic ester may be used, and specifically, a compound represented by the following formula (12) may be used.
- R represents hydrogen or an alkyl group
- L represents a divalent hydrocarbon group
- a divalent aliphatic hydrocarbon group may be used, and specifically, 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms.
- Divalent aliphatic hydrocarbon groups may be used, which include linear, branched or cyclic alkylene groups or alkynylene groups; Linear, branched or cyclic alkenylene groups; Or linear, branched or cyclic alkynylene groups.
- the hydrocarbon group may preferably be a linear or branched alkylene group or alkynylene group having 1 to 8 carbon atoms.
- Examples of the compound include (meth) acryloyloxyalkyl isocyanate, and more specifically, (meth) acryloyloxy (C 1-8 ) alkyl isocyanate, and more specifically, (meth) acryl Iloxy (C 1-4 ) alkyl isocyanate, more specifically (meth) acryloyloxyethyl isocyanate, may be mentioned, but is not limited thereto.
- (C 1-8 ) alkyl means straight, branched or cyclic alkyl having 1, 2, 3, 4, 5, 6, 7 or 8 carbon atoms
- (C 1-4 ) alkyl is By straight, branched or cyclic alkyl of 1, 2, 3 or 4 carbon atoms is meant.
- isocyanate functional acrylic ester compound a compound represented by the following formula (13) may also be used.
- R represents hydrogen or an alkyl group
- Z represents a tetravalent hydrocarbon group
- a tetravalent aliphatic hydrocarbon group can be used, for example, C1-C20, C1-C16, C1-C12, C1-C8, or C1-C4 divalent Aliphatic hydrocarbon groups may be used, and include linear, branched or cyclic alkylene groups; Linear, branched or cyclic alkenylene groups; Or linear, branched or cyclic alkynylene groups.
- the hydrocarbon group may preferably be a linear or branched alkylene group having 1 to 8 carbon atoms.
- a compound having a heterocyclic moiety such as tetrahydrofurfuryl (meth) acrylate or (meth) acryloyl morpholine may also be used. May also be used.
- a cationic curable adhesive composition containing an alicyclic and / or aliphatic epoxy compound as a main component as a cationically polymerizable compound, and optionally comprising an oxetane compound or a silane compound having the cationically polymerizable functional group as a diluent or additive.
- Radical curable adhesive composition which contains the said acrylamide compound as a main component as a radically polymerizable compound, and contains another radically polymerizable compound as a subcomponent as needed;
- An adhesive comprising a mixture of a compound and a hybrid curable adhesive composition comprising a radically polymerizable compound represented by any one of Formulas 8 to 10 in a cured state may be used, but is not limited thereto.
- the adhesive composition for forming the adhesive may further include a polymerization initiator.
- the polymerization initiator may be selected according to the components included in the adhesive composition, for example, cationic polymerization initiator and / or radical polymerization initiator may be used.
- initiators such as a benzoin system, a hydroxy ketone compound, an amino ketone compound, or a phosphine oxide compound
- a radical polymerization initiator can be used, for example, Preferably a phosphine oxide compound etc.
- Specific examples of the radical polymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone and dimethylanino acetophenone.
- a cationic polymerization initiator for example, as an initiator for releasing a component capable of initiating cationic polymerization by irradiation with an active energy ray, an ionizing cationic initiator of an onium salt or an organometallic salt series Or non-ionized cation initiators such as organic silanes or latent sulfonic acid series or other non-ionized compounds.
- the adhesive composition may further contain a thermosetting agent, a catalyst, a UV curing agent, a low molecular weight, a silane coupling agent, a scattering agent, an ultraviolet stabilizer, a colorant, a reinforcing agent, a filler, an antifoaming agent, a surfactant, a photosensitizer and a plasticizer. It may further include additives such as one or more kinds.
- the liquid crystal layer and the polarizer may be directly attached to each other through the adhesive layer, and if necessary, further include a primer layer between the polarizer and the adhesive layer or between the liquid crystal layer and the adhesive layer. It may be.
- the kind of primer layer that can be used is not particularly limited, and in general, all kinds of primers used for improving adhesion may be used.
- the optical element may further include a protective layer attached to the upper portion of the polarizer.
- FIG. 7 is a diagram exemplarily showing an optical element 7 further including a protective layer 71 attached to an upper portion of the polarizer 11.
- the protective layer may include, for example, a cellulose resin film such as a triacetyl cellulose (TAC) film; Polyester films such as PET (poly (ethylene terephthalate)) film and the like; Polycarbonate film; Polyethersulfone films; It may be an acrylic film or a polyolefin-based film such as polyethylene, polypropylene, or a cyclic olefin resin film, or the like, or a resin layer that is hardened to form a hard layer, but is not limited thereto.
- TAC triacetyl cellulose
- Polyester films such as PET (poly (ethylene terephthalate)) film and the like
- Polycarbonate film polycarbonate film
- Polyethersulfone films It may be an acrylic film or
- the optical element may further include a phase retardation layer disposed on one surface of the polarizer.
- the phase delay layer may be a quarter wave phase delay layer or a half wave phase delay layer.
- the term quarter or half wavelength phase retardation layer may refer to a phase retardation element capable of retarding incident light by one quarter or one half of that wavelength.
- FIG. 8 is a diagram exemplarily showing an optical element 8 further including a phase retardation layer 81 attached to an upper portion of the polarizer 11.
- the optical device having such a structure may be applied to an OLED (Organic Light Emitting Diode) to be useful as a device for implementing a light splitting function and an anti-reflection function.
- the phase retardation layer for example, a liquid crystal layer formed by polymerizing a polymer film or a polymerizable liquid crystal compound provided with birefringence by a stretching step or the like can be used.
- the optical element may further include a pressure-sensitive adhesive layer formed on one surface of the polarizer.
- the pressure-sensitive adhesive layer may be, for example, a pressure-sensitive adhesive layer for attaching the optical element to an optical device, for example, a liquid crystal panel of a liquid crystal display device or a video display element of a stereoscopic image display device.
- 9 is a diagram illustrating an optical element 9 in which an adhesive layer 91 is formed on the polarizer 11 by way of example.
- the pressure-sensitive adhesive layer may have a storage modulus of at least 0.02 MPa, at least 0.03 MPa, at least 0.04 MPa, at least 0.05 MPa, at least 0.06 MPa, at least 0.07 MPa, at least 0.08 MPa, at least 0.08 MPa, or at least 0.09 MPa at 25 ° C.
- the upper limit of the storage elastic modulus of the pressure-sensitive adhesive is not particularly limited.
- the storage modulus may be 0.25 MPa or less, 0.2 MPa or less, 0.16 MPa or less, 0.1 MPa or less, or 0.08 MPa or less.
- the optical element When the pressure-sensitive adhesive layer exhibits the storage elastic modulus, the optical element exhibits excellent durability, and thus, for example, the phase retardation characteristic of the phase retardation layer can be stably maintained for a long time and under severe conditions, thereby exhibiting stable light splitting characteristics. In addition, side effects such as light leakage may be prevented in the optical device to which the optical element is applied. In addition, the hardness characteristics of the optical element are improved, and excellent resistance to external pressure, scratches, and the like can be exhibited, and reworkability can be appropriately maintained.
- the pressure-sensitive adhesive layer may have a thickness of 25 ⁇ m or less, 20 ⁇ m or less, or 18 ⁇ m or less.
- the durability, hardness characteristics and reworkability may be further improved.
- the pressure-sensitive adhesive layer may include an acrylic pressure sensitive adhesive, a silicone pressure sensitive adhesive, an epoxy pressure sensitive adhesive or a rubber pressure sensitive adhesive.
- the said adhesive can be formed by hardening
- thermosetting component and the active energy ray curable component may refer to components in which such curing is induced by application of appropriate heat or irradiation of active energy rays, respectively.
- the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition containing a thermosetting component may include an acrylic polymer crosslinked by a multifunctional crosslinking agent.
- the acrylic polymer crosslinked by the polyfunctional crosslinking agent for example, an acrylic polymer having a weight average molecular weight of 500,000 or more can be used.
- the weight average molecular weight is a conversion value with respect to standard polystyrene measured by Gel Permeation Chromatograph (GPC).
- GPC Gel Permeation Chromatograph
- the term "molecular weight” means a "weight average molecular weight.”
- the molecular weight of a polymer is made into 500,000 or more, and the adhesive layer which has the outstanding durability under severe conditions can be formed.
- the upper limit of the molecular weight is not particularly limited, and for example, in consideration of durability and coating property of the composition, it can be adjusted in the range of 2.5 million or less.
- the acrylic polymer may be a polymer including a (meth) acrylic acid ester monomer and a crosslinkable monomer as a polymer unit.
- alkyl (meth) acrylate can be used, and alkyl (meth) having an alkyl group having 1 to 20 carbon atoms in consideration of the cohesion force, glass transition temperature, or tackiness of the pressure-sensitive adhesive.
- Acrylate can be used.
- Such monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) Acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, tetradecyl (meth) acrylate, and the like can be exemplified, and one or more of the above can be used.
- the polymer may also further comprise crosslinkable monomers as polymerized units.
- the polymer may include, for example, 80 parts by weight to 99.9 parts by weight of the (meth) acrylic acid ester monomer and 0.1 parts by weight to 20 parts by weight of the crosslinkable monomer as a polymerized unit.
- crosslinkable monomer means a monomer that can be copolymerized with other monomers forming an acrylic polymer and can provide a crosslinkable functional group to the polymer after copolymerization. The said crosslinkable functional group can react with the polyfunctional crosslinking agent mentioned later, and can form a crosslinked structure.
- crosslinkable functional group nitrogen containing functional groups, such as a hydroxyl group, a carboxyl group, an epoxy group, an isocyanate group, or an amino group, etc. can be illustrated, for example.
- the copolymerizable monomer which can provide such a crosslinkable functional group at the time of manufacture of an adhesive resin is known variously.
- crosslinkable monomer 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth Hydroxy group-containing monomers such as) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate; (Meth) acrylic acid, 2- (meth) acryloyloxy acetic acid, 3- (meth) acryloyloxy propyl acid, 4- (meth) acryloyloxy butyl acid, acrylic acid duplex, itaconic acid, maleic acid and Carboxyl group-containing monomers such as maleic anhydride or nitrogen-containing monomers such as (meth) acrylamide, N-vinyl pyrrolidone or N-vinyl caprolactam, and the like can be exemplified, and one or more
- Nitrogen containing monomers such as (meth) acrylonitrile, (meth) acrylamide, N-methyl (meth) acrylamide, or N-butoxy methyl (meth) acrylamide; Styrene-based monomers such as styrene or methyl styrene; Glycidyl (meth) acrylate; Or carboxylic acid vinyl esters such as vinyl acetate, and the like.
- Nitrogen containing monomers such as (meth) acrylonitrile, (meth) acrylamide, N-methyl (meth) acrylamide, or N-butoxy methyl (meth) acrylamide
- Styrene-based monomers such as styrene or methyl styrene
- Glycidyl (meth) acrylate or carboxylic acid vinyl esters such as vinyl acetate, and the like.
- Such additional monomers may be adjusted in the range of 20 parts by weight or less relative to the other monomers in total weight ratio.
- Acrylic polymers are prepared by applying a mixture of monomers selected and blended as necessary to each component described above in a polymerization mode such as solution polymerization, photopolymerization, bulk polymerization, suspension polymerization or emulsion polymerization. can do.
- a polymerization mode such as solution polymerization, photopolymerization, bulk polymerization, suspension polymerization or emulsion polymerization. can do.
- thermosetting crosslinking agents such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, and a metal chelate crosslinking agent
- polyfunctional isocyanate compounds such as tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoborone diisocyanate, tetramethylxylene diisocyanate or naphthalene diisocyanate, or the The compound etc.
- Epoxy crosslinkers include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'-tetraglycidyl ethylenediamine and glycerin diglycidyl ether
- N, N'-toluene-2,4-bis (1-aziridinecarboxamide), N, N'-diphenylmethane-4,4 At least one selected from the group consisting of '-bis (1-aziridinecarboxamide), triethylene melamine, bisisoprotaloyl-1- (2-methylaziridine) and tri-1-aziridinylphosphineoxide
- the metal chelate crosslinkers include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'-tetraglycidy
- the multifunctional crosslinking agent is included in the pressure-sensitive adhesive composition including the thermosetting component or the pressure-sensitive adhesive layer formed of the composition, for example, in an amount of 0.01 to 10 parts by weight or 0.01 to 5 parts by weight based on 100 parts by weight of the acrylic polymer. There may be.
- the ratio of the crosslinking agent may be changed depending on the physical properties such as the desired elastic modulus, the inclusion of other crosslinked structures in the pressure-sensitive adhesive layer, and the like.
- the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition containing the active energy ray curable component may include a crosslinked structure of the polymerized active energy ray polymerizable compound.
- the pressure-sensitive adhesive layer may be, for example, a functional group capable of participating in a polymerization reaction by irradiation of an active energy ray, for example, an alkenyl group, acryloyl group, methacryloyl group, acryloyloxy group, methacryloyloxy group, or the like.
- Examples of the compound having a functional group capable of participating in the polymerization reaction by irradiation of the active energy ray a functional group such as acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group in the side chain of the acrylic polymer A polymer introduced with;
- active energy ray-curable oligomers such as urethane acrylates, epoxy acrylates, polyester acrylates or polyether acrylates, or polyfunctional acrylates described below can be exemplified.
- the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition comprising a thermosetting component and an active energy ray curable component may simultaneously include a crosslinked structure comprising an acrylic polymer crosslinked with the multifunctional crosslinking agent and a crosslinked structure of the polymerized active energy ray polymerizable compound. Can be.
- Such an adhesive layer is an adhesive containing what is called an interpenetrating polymer network (hereinafter, "IPN").
- IPN interpenetrating polymer network
- the term “IPN” may refer to a state in which at least two crosslinked structures are present in the pressure-sensitive adhesive layer, and in one example, the crosslinked structures may be entangled with each other, or linked or penetrating. May be present.
- the pressure-sensitive adhesive layer contains an IPN, an optical element having excellent durability under severe conditions and excellent in workability or suppression of light leakage or crosstalk can be realized.
- thermosetting component in the pressure-sensitive adhesive layer containing IPN, as the multifunctional crosslinking agent and the acrylic polymer of the crosslinked structure embodied by the acrylic polymer crosslinked by the multifunctional crosslinking agent, for example, the above-described thermosetting component may be described in the section of the pressure-sensitive adhesive composition comprising the thermosetting component. Ingredients can be used.
- the active energy ray-polymerizable compound of the crosslinked structure of the polymerized active energy ray-polymerizable compound may also be used.
- the active energy ray polymerizable compound may be a multifunctional acrylate.
- the polyfunctional acrylate any compound having two or more (meth) acryloyl groups can be used without limitation.
- Ring structures included in the polyfunctional acrylate include carbocyclic structures or heterocyclic structures; Or any of a monocyclic or polycyclic structure.
- Examples of the polyfunctional acrylate including a ring structure include monomers having isocyanurate structures such as tris (meth) acryloxy ethyl isocyanurate and isocyanate-modified urethane (meth) acrylates (ex. Isocyanate monomers and trimethylol).
- Hexafunctional acrylates such as propane tri (meth) acrylate reactants) and the like can be exemplified, but is not limited thereto.
- the active energy ray-polymerizable compound forming the crosslinked structure in the pressure-sensitive adhesive layer containing IPN may be included in an amount of 5 parts by weight to 40 parts by weight based on 100 parts by weight of the acrylic polymer, for example. Therefore, it can be changed.
- the pressure-sensitive adhesive layer may include various additives known in the art, in addition to the aforementioned components.
- the pressure-sensitive adhesive layer further includes at least one additive selected from the group consisting of a silane coupling agent, a tackifying resin, an epoxy resin, a curing agent, an ultraviolet stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, an antifoaming agent, a surfactant, and a plasticizer. can do.
- the pressure-sensitive adhesive layer may be, for example, a method of applying and curing the pressure-sensitive adhesive composition prepared by blending the above-described components by means such as a bar coater or a comma coater.
- the method of curing the pressure-sensitive adhesive composition is not particularly limited, for example, to maintain the composition at an appropriate temperature so that the crosslinking reaction of the acrylic polymer and the polyfunctional crosslinking agent and the polymerization of the active energy ray-curable compound is possible. It can harden
- the irradiation of the active energy ray may be performed using, for example, a high-pressure mercury lamp, an electrodeless lamp, a xenon lamp, or the like, and the conditions such as the wavelength and the amount of light of the active energy ray to be irradiated may be the active energy.
- the polymerization of the precurable compound may be selected in a range within which it can be appropriately performed.
- the pressure-sensitive adhesive layer has a storage modulus at 25 ° C. of 0.02 MPa or more, 0.05 MPa or more, or more than 0.08 MPa, or more than 0.08 MPa, 0.25 MPa or less, 0.09 MPa to 0.2 MPa or 0.09 MPa to It may be a pressure-sensitive adhesive layer of 0.16 MPa.
- Such an adhesive layer may be, for example, an adhesive layer including the IPN.
- the pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer having a storage modulus at 25 ° C. of 0.02 MPa to 0.08 MPa or 0.04 MPa to 0.08 MPa.
- Such an adhesive may be an adhesive layer including a crosslinked structure of the thermosetting component.
- the present invention also relates to a method for producing an optical element.
- An exemplary optical device manufacturing method may include attaching the liquid crystal layer and the polarizer using the adhesive.
- liquid crystal layer for example, an alignment film is formed on a base material layer, the coating layer of the liquid crystal composition containing the said polymeric liquid crystal compound is formed on the said alignment film, and it polymerizes in the state which orientated the said liquid crystal composition, and liquid-crystal It can be prepared by forming a layer.
- the alignment layer may be formed by, for example, forming a polymer film such as polyimide on a substrate layer and rubbing treatment, coating a photo-alignment compound, and performing alignment treatment through irradiation of linearly polarized light or (nano) imprinting.
- a polymer film such as polyimide
- rubbing treatment coating a photo-alignment compound
- performing alignment treatment through irradiation of linearly polarized light or (nano) imprinting have.
- various methods of forming an alignment film are known in consideration of a desired alignment pattern, for example, the patterns of the first and second regions.
- the coating layer of the liquid crystal composition can be formed by coating the composition on the alignment film of the base layer in a known manner.
- the liquid crystal layer may be formed by aligning the polymer according to the alignment pattern of the alignment film existing under the coating layer and then polymerizing the same.
- the method of attaching the liquid crystal layer and the polarizer is also not particularly limited.
- the above-described adhesive composition is coated on one surface of a liquid crystal layer or polarizer, and the liquid crystal layer and the polarizer are laminated through the coating layer to cure the adhesive composition, or a dropping method using the adhesive composition.
- a dropping method using the adhesive composition.
- Curing of the adhesive composition in the above for example, in consideration of the components contained in the composition may be carried out by irradiating an active energy ray of a suitable intensity with an appropriate amount of light.
- the manufacturing method may further include forming an additional layer such as the protective layer or a quarter-wave phase retardation layer in addition to the above process, and the specific manner of performing the above process is not particularly limited.
- the present invention also relates to a stereoscopic image display device.
- An exemplary stereoscopic image display device may include the optical element described above.
- the display device further includes a display element capable of generating a left eye image signal (hereinafter referred to as an L signal) and a right eye image signal (hereinafter referred to as an R signal), wherein the optical element is the liquid crystal layer.
- the first and second regions of may be arranged to transmit the L signal, and the other region may be arranged to transmit the R signal.
- the R and L signals may be arranged to be emitted from the display device to transmit the polarizer of the optical device first, and then to be incident on the respective areas of the liquid crystal layer.
- the stereoscopic image display device includes the optical element as a light splitting element, various methods known in the art may be applied and manufactured.
- FIG. 10 exemplarily shows a device as an example of the above device, in which an observer may wear a polarized glasses and observe a stereoscopic image.
- the apparatus 10 may include, for example, a light source 101, a polarizing plate 102, the display element 103, and the optical element 104 sequentially.
- the light source 101 may be, for example, a direct type or edge type backlight generally used in an LCD (Liquid Crystal Display) or the like.
- the display element 103 may be a transmissive liquid crystal display panel including a plurality of unit pixels arranged in a row and / or column direction. One or more pixels may be combined to form a right eye image signal generation region (hereinafter referred to as RG region) for generating an R signal and a left eye image signal generation region (hereinafter referred to as LG region) for generating an L signal. .
- RG region right eye image signal generation region
- LG region left eye image signal generation region
- the RG and LG regions may be alternately disposed adjacent to each other while having a stripe shape extending in a common direction as shown in FIG. 11, or alternately disposed adjacent to each other while forming a lattice pattern as illustrated in FIG. 12.
- the first and second regions are LC or RC regions, respectively, and the R signal transmitted from the RG region is considered to be a polarizer 1041 in consideration of the arrangement of the RG and LG regions.
- the L signal may be disposed to be incident to the RC region through the polarizer, and the L signal may be incident to the LC region through the polarizer 1041.
- the display element 103 may be, for example, a first transparent substrate, a pixel electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a common electrode, a color filter, a second transparent substrate, and the like sequentially disposed from the light source 101 side. It may be a liquid crystal panel comprising a.
- the polarizing plate 102 may be attached to the light incident side of the panel, that is, the light source 101 side, and the optical element 104 may be attached to the opposite side of the panel.
- the polarizer included in the polarizing plate 102 and the polarizer 1041 included in the optical element 104 may be arranged such that, for example, both absorption axes form a predetermined angle, for example, 90 degrees. As a result, the light emitted from the light source 101 can be transmitted or blocked through the display element 103.
- unpolarized light from the light source 101 of the display device 10 may be emitted to the polarizing plate 102 side.
- the polarizer 102 light having a polarization axis in a direction parallel to the light transmission axis of the polarizer of the polarizer 102 may pass through the polarizer 102 and be incident to the display element 103.
- Light incident on the display element 103 and transmitted through the RG region becomes an R signal
- light passing through the LG region becomes an L signal and is incident on the polarizer 1041 of the optical element 104.
- the light transmitted through the LC region and the light transmitted through the RC region are respectively emitted in states having different polarization states.
- the R and L signals having different polarization states may be incident on the right and left eyes of the observer wearing polarized glasses, and thus the observer may observe a stereoscopic image.
- An exemplary optical element of the present invention may be a light splitting element, for example, an element for dividing incident light into two or more types of light having different polarization states.
- the optical element may be used to implement, for example, a stereoscopic image.
- FIG. 1 is a schematic diagram illustrating an exemplary optical element.
- FIGS. 2 and 3 are schematic diagrams showing an exemplary arrangement of the first and second regions of the liquid crystal layer.
- FIG. 4 is a schematic diagram showing an exemplary optical axis arrangement of the first and second regions of the liquid crystal layer.
- 5-9 is a schematic diagram which shows an exemplary optical element.
- FIG. 10 is a schematic diagram illustrating an exemplary stereoscopic image display device.
- 11 and 12 are schematic diagrams showing an exemplary arrangement of the RG and LG regions.
- optical device will be described in more detail with reference to Examples and Comparative Examples, but the scope of the optical device is not limited to the following examples.
- the glass transition temperature of the adhesive layer is coated with the adhesive composition prepared on the release treated surface of the release PET sheet so as to have a thickness of 10 ⁇ m after curing, and after laminating the release treatment surface of the release moldable PET on top of the coating layer again.
- the adhesive layer formed by irradiating ultraviolet rays (UV A region, light quantity: 500mJ / cm 2 ) using a device (metal halide lamp) was measured under a condition of a temperature rising rate of 10 ° C./min using DSC (Differential Scanning Calorimeter). .
- the base material, the alignment layer, the liquid crystal layer, the adhesive layer, and the optical device which were prepared in Examples and Comparative Examples, were peeled at a peeling angle of 90 degrees and a peeling speed of 300 m / min with respect to the optical element in which the polarizer was sequentially formed.
- the adhesive force was evaluated by evaluating the peeling force of the said polarizer with respect to a layer.
- the peeling experiment was performed by cutting the manufactured optical element to have a width of 20 mm and a length of 100 mm. Evaluation criteria are as follows.
- the pressure-sensitive adhesive layer was attached to the glass substrate. Thereafter, the optical element was left at ⁇ 40 ° C. for 1 hour, and 100 cycles were repeated, with 1 cycle being left at 80 ° C. for 1 hour. Thereafter, the appearance of the optical element was visually observed to determine whether there was no deformation, and O was defined as the case where no deformation occurred, and X when the deformation such as cracks occurred.
- the durability of the liquid crystal layer was evaluated by measuring the rate of change of the retardation value generated after the endurance test for the archeological elements manufactured in Examples and Comparative Examples. Specifically, the optical element is cut to have a length of 10 cm in length and width, and then attached to the glass substrate through an adhesive layer, and left at 100 ° C. for 100 hours or 250 hours at 80 ° C. The amount of reduction of the phase difference value after standing in comparison with the phase difference value of the liquid crystal layer before being left to stand was evaluated according to the following criteria. In the above, the retardation value was measured at a wavelength of 550 nm according to the manufacturer's manual using Axomatrix Axoscan.
- Alicyclic epoxy compound (3, 4- epoxycyclohexyl methyl-3, 4'- epoxy cyclohexane carboxylate, celloxide C2021P (made by Dicel company)) 22 weight part, 1, 4- cyclohexanedimethol diglyci 22 parts by weight of dill ether, 50 parts by weight of 3-ethyl-3-hydroxymethyloxetane (OXT101) and a cationic initiator (diphenyl- (4-phenylthio) phenylsulfonium hexafluorophosphate, CPI100P, manufactured by SANAPRO) 6
- the adhesive composition (E) was prepared by blending parts by weight.
- Alicyclic epoxy compound (3, 4- epoxycyclohexyl methyl-3, 4'- epoxy cyclohexane carboxylate, celloxide C2021P (made by Dicel company)) 22 weight part, 1, 4- cyclohexanedimethol diglyci 22 parts by weight of diethyl ether, 10 parts by weight of 3-ethyl-3 [[3-ethyloxetan-3-yl] methoxy] methyl] (OXT221), 40-ethyl-3-hydroxymethyloxetane (OXT101) 40
- An adhesive composition (F) was prepared by blending parts by weight and 6 parts by weight of a cationic initiator (diphenyl- (4-phenylthio) phenylsulfonium hexafluorophosphate, CPI100P, manufactured by SANAPRO).
- Alicyclic epoxy compound (3, 4- epoxycyclohexyl methyl-3, 4'- epoxy cyclohexane carboxylate, celloxide C2021P (made by Dicel company)) 22 weight part, 1, 4- cyclohexanedimethol diglyci 22 parts by weight of diethyl ether, 25 parts by weight of 3-ethyl-3 [[3-ethyloxetan-3-yl] methoxy] methyl] (OXT221), 25 parts by weight of 3-ethyl-3-hydroxymethyloxetane (OXT101) 25 Adhesive composition G) was prepared by blending 6 parts by weight of a cationic initiator (diphenyl- (4-phenylthio) phenylsulfonium hexafluorophosphate, CPI100P, manufactured by SANAPRO).
- a cationic initiator diphenyl- (4-phenylthio) phenylsulfonium hexaflu
- An adhesive composition (H) was prepared by blending 3 parts by weight and 3 parts by weight of photoinitiator (Irgacure 819).
- the composition for forming a photo-alignment film was coated so that the thickness after drying was about 1,000 mm 3, and dried in an oven at 80 ° C. for 2 minutes.
- a photoinitiator Igacure 907
- the dried photo-alignment film-forming composition was subjected to alignment treatment according to the method disclosed in Korean Patent Application No. 2010-0009723 to form a photo-alignment film including first and second alignment regions oriented in different directions.
- a pattern mask having a light transmitting portion and a light blocking portion having a width of about 450 ⁇ m and a light blocking portion alternately formed up and down and left and right are positioned on the dried composition, and different from each other on the pattern mask.
- the polarizing plate in which two regions which transmit polarization were formed was located.
- ultraviolet rays 300 mW / cm 2
- the alignment treatment was performed by irradiation for about 30 seconds.
- a liquid crystal layer was formed on the alignment layer subjected to the alignment treatment.
- the liquid crystal composition comprising 70 parts by weight of the polyfunctional polymerizable liquid crystal compound represented by the following general formula (A) and 30 parts by weight of the monofunctional polymerizable liquid crystal compound represented by the following general formula (B), comprising an appropriate amount of photoinitiator:
- the lower alignment layer is aligned in accordance with the alignment, and then irradiated with ultraviolet (300 mW / cm 2 ) for about 10 seconds to cross-link and polymerize the liquid crystal, so that the alignment of the lower photo alignment layer Therefore, the liquid crystal layer in which the 1st and 2nd area
- a liquid crystal layer was manufactured in the same manner as in Production Example 11, except that the weight ratio of the polyfunctional polymerizable liquid crystal compound and the monofunctional polymerizable liquid crystal compound contained in the liquid crystal composition was adjusted as shown in Table 1 below.
- An optical device was manufactured in the following manner. First, the polarizer and the adhesive of the polarizing plate comprising a polyvinyl alcohol-based polarizer in which a transparent protective film is formed on one surface of the liquid crystal layer in a structure prepared in Preparation Example 11, that is, a structure in which a TAC substrate, an alignment layer and a liquid crystal layer are sequentially formed. Adhesion was carried out using composition (B).
- the polarizer is laminated thereon, and the ultraviolet rays of the UV A region are irradiated from the transparent protective film side (500 mJ / cm 2 ) to form an adhesive layer, and a polarizer and a liquid crystal layer were attached. Thereafter, a conventional acrylic pressure-sensitive adhesive layer was formed on one surface of the transparent protective film of the polarizer to prepare an optical device.
- the type of the liquid crystal layer and the adhesive composition, and the thickness of the adhesive layer to be formed to change as shown in Table 2, and the optical element as in Example 1 except that the ultraviolet irradiation conditions were adjusted to sufficiently cure the adhesive composition was prepared.
- the type of the liquid crystal layer and the adhesive composition, and the thickness of the adhesive layer to be formed to change as shown in Table 3, and the optical element as in Example 1 except that the ultraviolet irradiation conditions were adjusted to sufficiently cure the adhesive composition was prepared.
- LG Video signal generation area for left eye
- RG video signal generation area for right eye
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Abstract
Description
액정층 | 접착제 조성물 종류 | 접착제층 두께(㎛) | ||
실시예 | 2 | 액정층(A) | 접착제 조성물(B) | 3 |
3 | 액정층(A) | 접착제 조성물(B) | 5 | |
4 | 액정층(A) | 접착제 조성물(C) | 1 | |
5 | 액정층(A) | 접착제 조성물(D) | 1 | |
6 | 액정층(A) | 접착제 조성물(E) | 1 | |
7 | 액정층(A) | 접착제 조성물(E) | 5 | |
8 | 액정층(A) | 접착제 조성물(F) | 1 | |
9 | 액정층(A) | 접착제 조성물(G) | 1 | |
10 | 액정층(A) | 접착제 조성물(I) | 1 | |
11 | 액정층(A) | 접착제 조성물(J) | 1 | |
12 | 액정층(B) | 접착제 조성물(D) | 1 | |
13 | 액정층(B) | 접착제 조성물(F) | 1 | |
액정층 | 접착제 조성물 종류 | 접착제층 두께(㎛) | ||
비교예 | 1 | 액정층(A) | 접착제 조성물(A) | 1 |
2 | 액정층(A) | 접착제 조성물(H) | 1 | |
3 | 액정층(C) | 접착제 조성물(D) | 1 | |
4 | 액정층(C) | 접착제 조성물(F) | 1 | |
5 | 액정층(D) | 접착제 조성물(A) | 1 | |
6 | 액정층(D) | 접착제 조성물(B) | 1 | |
7 | 액정층(D) | 접착제 조성물(D) | 1 | |
8 | 액정층(D) | 접착제 조성물(E) | 1 | |
9 | 액정층(D) | 접착제 조성물(E) | 7 | |
10 | 액정층(D) | 접착제 조성물(F) | 1 | |
11 | 액정층(E) | 접착제 조성물(E) | 1 | |
12 | 액정층(E) | 접착제 조성물(F) | 1 | |
13 | 액정층(E) | 접착제 조성물(E) | 7 | |
접착제층 유리전이온도(℃) | 접착력 | 열충격 물성 | 액정층 내구성 | ||
실시예 | 1 | 40 | ○ | ○ | ○ |
2 | 40 | ○ | ○ | ○ | |
3 | 40 | ○ | ○ | ○ | |
4 | 75 | ○ | ○ | ○ | |
5 | 85 | ○ | ○ | ○ | |
6 | 45 | ○ | ○ | ○ | |
7 | 45 | ○ | ○ | ○ | |
8 | 60 | ○ | ○ | ○ | |
9 | 90 | ○ | ○ | ○ | |
10 | 40 | ○ | ○ | ○ | |
11 | 60 | ○ | ○ | ○ | |
12 | 85 | ○ | ○ | ○ | |
13 | 60 | ○ | ○ | ○ | |
접착제층 유리전이온도(℃) | 접착력 | 열충격 물성 | 액정층 내구성 | ||
비교예 | 1 | 30 | ○ | × | ○ |
2 | 35 | ○ | × | ○ | |
3 | 85 | ○ | ○ | × | |
4 | 60 | × | ○ | × | |
5 | 30 | × | × | × | |
6 | 40 | × | ○ | × | |
7 | 85 | × | ○ | × | |
8 | 45 | × | ○ | × | |
9 | 45 | × | × | × | |
10 | 60 | × | ○ | × | |
11 | 45 | × | ○ | × | |
12 | 60 | × | ○ | × | |
13 | 45 | × | × | × | |
Claims (23)
- 전이온도가 36℃ 이상인 접착제층으로 부착되어 있는 편광자; 및 액정층을 포함하고, 상기 액정층은, 다관능성 중합성 액정 화합물 및 단관능성 중합성 액정 화합물을 포함하며, 상기 단관능성 중합성 액정 화합물은, 상기 다관능성 중합성 액정 화합물 100 중량부 대비 0 중량부를 초과하고, 100 중량부 이하인 양으로 액정층에 포함되는 광학 소자.
- 제 1 항에 있어서, 하기 일반식 1의 조건을 만족하는 광학 소자:[일반식 1]X < 8%상기 일반식 1에서 X는 상기 광학 소자의 액정층의 초기 위상차 수치 대비 상기 광학 소자를 80℃에서 100시간 방치한 후의 상기 액정층의 위상차 수치의 변화량의 절대값의 백분율이다.
- 제 1 항에 있어서, 액정 화합물은 하기 화학식 1로 표시되는 광학 소자:[화학식 1]상기 화학식 1에서 A는 단일 결합, -COO- 또는 -OCO-이고, R1 내지 R10은, 각각 독립적으로 수소, 할로겐, 알킬기, 알콕시기, 알콕시카보닐기, 시아노기, 니트로기, -O-Q-P 또는 하기 화학식 2의 치환기이되, R1 내지 R10 중 적어도 하나는 -O-Q-P 또는 하기 화학식 2의 치환기이거나, R1 내지 R5 중 인접하는 2개의 치환기 또는 R6 내지 R10 중 인접하는 2개의 치환기는 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하고, 상기에서 Q는 알킬렌기 또는 알킬리덴기이며, P는, 알케닐기, 에폭시기, 시아노기, 카복실기, 아크릴로일기, 메타크릴로일기, 아크릴로일옥시기 또는 메타크릴로일옥시기이다:[화학식2]상기 화학식 2에서 B는 단일 결합, -COO- 또는 -OCO-이고, R11 내지 R15는, 각각 독립적으로 수소, 할로겐, 알킬기, 알콕시기, 알콕시카보닐기, 시아노기, 니트로기 또는 -O-Q-P이되, R11 내지 R15 중 적어도 하나는 -O-Q-P이거나, R11 내지 R15 중 인접하는 2개의 치환기는 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하고, 상기에서 Q는 알킬렌기 또는 알킬리덴기이며, P는, 알케닐기, 에폭시기, 시아노기, 카복실기, 아크릴로일기, 메타크릴로일기, 아크릴로일옥시기 또는 메타크릴로일옥시기이다.
- 제 1 항에 있어서, 중합성 액정 화합물은 수평 배향된 상태로 액정층에 포함되어 있는 광학 소자.
- 제 1 항에 있어서, 액정층은 면내 지상축 방향의 굴절률과 면내 진상축 방향의 굴절률의 차이가 0.05 내지 0.2이고, 두께가 0.5 ㎛ 내지 2.0 ㎛인 광학 소자.
- 제 1 항에 있어서, 액정층은 서로 위상 지연 특성이 상이한 제 1 및 제 2 영역을 포함하는 광학 소자.
- 제 6 항에 있어서, 제 1 영역 및 제 2 영역은 서로 상이한 방향으로 형성된 광축을 가지는 광학 소자.
- 제 7 항에 있어서, 제 1 영역의 광축과 제 2 영역의 광축이 이루는 각도를 이등분하는 선은 편광자의 흡수축과 수직 또는 수평을 이루는 광학 소자.
- 제 1 항에 있어서, 액정층이 일면에 형성되는 기재층을 추가로 포함하는 광학 소자.
- 제 9 항에 있어서, 기재층은 액정층에 비하여 낮은 굴절률을 가지는 광학 소자.
- 제 9 항에 있어서, 기재층의 표면에 형성되어 있는 표면 처리층을 추가로 포함하는 광학 소자.
- 제 11 항에 있어서, 표면 처리층은 고경도층, 눈부심 방지층 또는 저반사층인 광학 소자.
- 제 1 항에 있어서, 접착제층은 유리전이온도가 38℃ 이상인 광학 소자.
- 제 1 항에 있어서, 접착제층은 유리전이온도가 40℃ 이상인 광학 소자.
- 제 1 항에 있어서, 접착제층은 두께가 6 ㎛ 이하인 광학 소자.
- 제 1 항에 있어서, 접착제층은 활성 에너지선 경화형 접착제인 광학 소자.
- 제 1 항에 있어서, 접착제는 라디칼 중합성 화합물 및 양이온 중합성 화합물로 이루어진 군으로부터 선택된 하나 이상을 포함하는 광학 소자.
- 제 1 항에 있어서, 편광자와 접착제층의 사이 또는 액정층과 접착제층의 사이에 프라이머층을 추가로 포함하는 광학 소자.
- 제 1 항에 있어서, 편광자의 일면에 배치되어 있는 위상 지연층을 추가로 포함하는 광학 소자.
- 제 1 항에 있어서, 편광자의 일면에 형성되어 있고, 25℃에서의 저장 탄성률이 0.02 MPa 내지 0.08 MPa이며, 다관능성 가교제로 가교된 아크릴 중합체의 가교 구조를 포함하는 점착제층을 추가로 가지는 광학 소자.
- 제 1 항에 있어서, 편광자의 일면에 형성되어 있고, 25℃에서의 저장 탄성률이 0.08 MPa를 초과하며, 다관능성 가교제로 가교된 아크릴 중합체를 포함하는 가교 구조 및 중합된 활성 에너지선 중합성 화합물을 포함하는 가교 구조를 가지는 점착제층을 추가로 포함하는 광학 소자.
- 제 1 항의 광학 소자를 포함하는 입체 영상 표시 장치.
- 제 22 항에 있어서, 좌안용 영상 신호와 우안용 영상 신호를 생성할 수 있는 표시 소자를 추가로 포함하고, 광학 소자는 액정층의 제 1 및 제 2 영역 중 어느 하나의 영역은 상기 좌안용 영상이 투과될 수 있고, 다른 하나의 영역은 상기 우안용 영상이 투과될 수 있도록 배치되어 있는 입체 영상 표시 장치.
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JPH10153707A (ja) * | 1996-11-22 | 1998-06-09 | Sharp Corp | 位相差シートおよびその製造方法、ならびにその位相差シートを用いた立体表示装置 |
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