WO2013073922A1 - 광학 소자 - Google Patents
광학 소자 Download PDFInfo
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- WO2013073922A1 WO2013073922A1 PCT/KR2012/009799 KR2012009799W WO2013073922A1 WO 2013073922 A1 WO2013073922 A1 WO 2013073922A1 KR 2012009799 W KR2012009799 W KR 2012009799W WO 2013073922 A1 WO2013073922 A1 WO 2013073922A1
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- liquid crystal
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- compound
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
- C09K2019/0448—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
- C09K19/2007—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers the chain containing -COO- or -OCO- groups
- C09K2019/2035—Ph-COO-Ph
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
- C09K19/2007—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers the chain containing -COO- or -OCO- groups
- C09K2019/2078—Ph-COO-Ph-COO-Ph
Definitions
- the present application relates to an optical element and its use.
- 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.
- Patent Document 1 Japanese Laid-Open Patent No. 2005-049865
- Patent Document 2 Korean Patent No. 0967899
- Patent Document 3 Korean Patent Publication No. 2010-0089782
- the present application provides an optical element and its use.
- optical element may mean any kind of optical instrument, optical component, optical device or the like that exhibits one or more intended functions.
- the optical element may have the form of a sheet or a film.
- the optical element may be, for example, an element capable of dividing incident light into two or more kinds of light having different polarization states from each other.
- the optical element may include a liquid crystal layer.
- the liquid crystal layer included in 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 liquid crystal layer at 80 ° C. for 100 hours or 250 hours compared to the initial phase difference value of the liquid crystal layer.
- X may be calculated as, for example, "100 x (
- R 0 is the initial phase difference value of the liquid crystal layer
- R 1 means the phase difference value of the liquid crystal layer after leaving the liquid crystal layer at 100 ° C. for 100 hours or 250 hours.
- X may be, for example, 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 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 may mean a refractive index in a direction showing the highest refractive index in the plane of the liquid crystal layer
- the refractive index in the fast axis direction may mean a refractive index in a direction showing the lowest refractive index on the plane of the liquid crystal layer.
- 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 difference in refractive index can be measured according to the manufacturer's manual, for example, using Axoscan, Axoscan.
- 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 contain a polymerizable liquid crystal compound.
- the liquid crystal layer may include a polymerizable liquid crystal compound 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 contained in a polymerized form may mean a state in which the liquid crystal compound is polymerized to form a skeleton of the liquid crystal polymer in the liquid crystal layer.
- the liquid crystal layer may further contain 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.
- 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.
- optical axis may refer to a slow axis or fast axis when light passes through the 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 "parts by weight” may mean a ratio of weight.
- 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 A substituent of Formula 2 or a pair of two adjacent substituents of R 1 to R 5 or a pair of two adjacent substituents of R 6 to R 10 are connected to each other to form a benzene substituted with -OQP, wherein R 1 to At least one of R 10 is -OQP or a substituent of Formula 2 below, or at least one pair of two adjacent substituents of R 1 to R 5 or two adjacent substituents of R 6 to R 10 are connected to each other to form -OQP Form benzene substituted with Q, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group
- B is a single bond, -COO- or -OCO-
- R 11 to R 15 are each independently hydrogen, halogen, alkyl group, alkoxy group, alkoxycarbonyl group, cyano group, nitro group or -OQP, or A pair of adjacent two substituents of R 11 to R 15 are connected to each other to form a benzene substituted with -OQP, wherein at least one of R 11 to R 15 is -OQP or two adjacent ones of R 11 to R 15 The pair of substituents are connected to each other to form 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, methacrylo It is a polymerizable functional group, such as a diary, acryloyloxy group, or methacryloyloxy group.
- two adjacent substituents may be linked to each other to form a 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. .
- single bond means a case where no separate atom is present in the moiety 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.
- halogen in the formula (1) and (2) for example, chlorine, bromine or iodine and the like can be exemplified.
- alkyl group means, for example, 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, unless otherwise specified. Or a cycloalkyl group having, for example, 3 to 20 carbon atoms, 3 to 16 carbon atoms, or 4 to 12 carbon atoms.
- the alkyl group may be optionally substituted by one or more substituents.
- alkoxy group may refer to 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, unless otherwise specified.
- the alkoxy group may be linear, branched or cyclic.
- the alkoxy group may be optionally substituted by one or more substituents.
- alkylene group or “alkylidene group” may mean, for example, an alkylene group or an 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, for example, linear, branched or cyclic.
- the alkylene group or alkylidene group may be optionally substituted by one or more substituents.
- alkenyl group may mean, for example, 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, for example, linear, branched or cyclic.
- the alkenyl group may be optionally substituted by one or more substituents.
- P may be, for example, acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group, may be acryloyloxy group or methacryloyloxy group, and in another example 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, for example, be present at a position of R 3 , R 8, or R 13 .
- the substituents connected to each other to constitute benzene substituted with -OQP may be, for example, R 3 and R 4 or R 12 and R 13 .
- Substituents other than -OQP or residues of formula 2 or substituents connected to each other to form benzene at the compound of formula 1 or the residue of formula 2, for example, are hydrogen, halogen, straight or branched chain having 1 to 4 carbon atoms.
- alkyl group alkoxycarbonyl group containing a straight or branched chain alkoxy 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 cyano group or a nitro group, in another example, chlorine, carbon atoms
- alkoxycarbonyl group or cyano group including a straight or branched chain alkyl group of 1 to 4, a cycloalkyl group of 4 to 12 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, a straight or branched chain alkoxy group of 1 to 4 carbon atoms.
- the polymerizable liquid crystal compound may be included in the liquid crystal layer in a horizontally aligned state.
- the polymerizable liquid crystal compound may be polymerized in a horizontal alignment state and included in the liquid crystal layer.
- horizontal alignment means that the optical axis of the liquid crystal layer containing the liquid crystal compound is about 0 degrees to about 25 degrees, about 0 degrees to about 15 degrees, about 0 degrees to about 10 degrees, and about 0 degrees with respect to the plane of the liquid crystal layer. To an angle of inclination of about 5 degrees or about 0 degrees.
- 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 phase delay characteristics different from each other.
- the phase delay characteristics of the first region and the second region are different from each other means that the first and second regions are the same as each other in a state in which both the first and second regions have a phase delay characteristic.
- the optical axes are formed in different directions and the phase delay values are also different from each other, and the optical axes are formed in different directions while having the same phase delay values.
- the phase delay characteristics of the first and second regions are different means that any one of the first and second regions is a region having phase delay characteristics, and the other region is optical without phase delay characteristics.
- an isotropic region may be included.
- region not containing is mentioned.
- the phase delay characteristics of the first or second region can 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 arranged adjacently in a stripe shape extending in the common direction as shown in FIG. 1, or adjacent to each other in a grid pattern as shown in FIG. 3. May be alternately arranged.
- one of the first and second regions is a left-eye image signal polarization adjusting region (hereinafter referred to as an "LC region"), and the other.
- One area may be a right eye image signal polarization control area (hereinafter, may be referred to as an "RC area").
- the two or more types of light having different polarization states, divided by the liquid crystal layer including the first and second regions, include, for example, two types of linearly polarized light having directions substantially perpendicular to each other, or Or, 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.
- the error may include an error within about ⁇ 15 degrees, an error within about ⁇ 10 degrees, or 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 rotated in the direction to transmit.
- 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.
- any one of the first and second regions may be an area capable of transmitting incident light to left circularly polarized light, and another region may be an area capable of converting incident light into right polarized light and transmitting it.
- 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 from each other may be, for example, about 90 degrees.
- a line which bisects an angle formed by the optical axes of the first and second regions is divided by the absorption axis of the polarizer included in the optical element described later. It may be formed to be vertical or horizontal.
- FIG. 3 is an exemplary view for explaining the arrangement of the optical axes when the first and second regions A and B of the example of FIG. 1 or 2 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. If the substrate layer is further included, the liquid crystal layer may be formed on one surface of the substrate layer.
- the base material layer may have a single layer or a multilayer structure.
- 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 base layer for example, the plastic base 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. If 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 optical axis of the base material layer may be disposed to be perpendicular or horizontal to a line bisecting the angle formed by the optical axes of the first and second regions.
- the base material layer may include a sunscreen or a ultraviolet absorber.
- a sunscreen or a ultraviolet absorber 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.
- An exemplary optical element may further include an alignment layer between the substrate layer and the liquid crystal layer.
- the optical element may sequentially include the liquid crystal layer 101, the alignment layer 102, and the base layer 103.
- the alignment layer may be a layer that serves to orient the liquid crystal compound of the liquid crystal layer.
- a conventional alignment layer known in the art for example, an alignment layer, a photo alignment layer, a rubbing alignment layer, or the like formed by an imprinting method, 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 optical element may further comprise a polarizing plate.
- the polarizer 201 may be attached to the liquid crystal layer 101 as shown in FIG. 5.
- the polarizer may comprise a polarizer.
- the terms "polarizer” and "polarizing plate” refer to objects that are distinguished from each other. That is, the term polarizer means a functional element, a film, or a sheet itself that can extract light vibrating in one direction from incident light while vibrating in various directions, and the term polarizing plate is a laminate comprising at least the polarizer. It may mean. Examples of other elements, films, or sheets that may be included with the polarizer in the polarizer may include a polarizer protective layer described below.
- the polarizer of the polarizing plate may include a light absorption axis formed in a predetermined direction and a light transmission axis perpendicular to the light absorption axis.
- a conventional polarizer such as a poly (vinyl alcohol) polarizer can be used.
- the polarizer protective layer may be formed on one or both surfaces of the polarizer in the polarizer.
- a cellulose film such as TAC or DAC, an amorphous polyolefin film, a polyester film, an acrylic resin film, a polycarbonate film, a polysulfone film, an alicyclic polyimide film, or a cyclic olefin polymer (COP) film
- COP cyclic olefin polymer
- examples thereof include a resin film, a resin layer cured by electromagnetic waves such as ultraviolet rays, and the like.
- the polarizing plate may be attached to the liquid crystal layer by an adhesive layer or an adhesive layer.
- an adhesive layer may be used when the liquid crystal layer is attached to the polarizer of the polarizing plate, and an adhesive layer may be used when the liquid crystal layer is attached to another layer of the polarizing plate, for example, the polarizer protective layer.
- an adhesive layer may be formed in the surface of a polarizing plate, for example, the surface on the opposite side to the surface which opposes the said liquid crystal layer.
- FIG. 6 shows a device having a structure including a second pressure sensitive adhesive layer 302, a polarizing plate 201, a first pressure sensitive adhesive layer or an adhesive layer 301, and a liquid crystal layer 101 as an exemplary optical device.
- the second pressure sensitive adhesive layer may be a pressure sensitive adhesive layer for attaching the optical element to the optical device.
- the optical device for example, a liquid crystal panel of a liquid crystal display device or an image display element of a stereoscopic image display device may be exemplified. .
- the adhesive layer 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. .
- an optical device having excellent durability may be provided.
- Such an adhesive layer can 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 layer can 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 layer may be, for example, 0.1 ⁇ m, 0.3 ⁇ m or 0.5 ⁇ m.
- the adhesive layer may be an active energy ray curable adhesive layer.
- the adhesive layer may include an adhesive composition cured by irradiation of active energy rays.
- curing the adhesive composition or the pressure-sensitive adhesive composition '' may refer to a process in which the adhesiveness or tackiness is expressed by physical or chemical action or reaction of the components contained in the composition.
- active energy ray curing type may mean an adhesive or an adhesive composition of a type in which the curing is induced by irradiation of active energy rays.
- 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.
- An adhesive bond layer can contain a radically polymerizable compound or a cationically polymerizable compound.
- the radical or cationically polymerizable compound may be included in the adhesive layer 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 type of the radical polymerizable compound or the cation polymerizable compound, or may include both types.
- 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, for example epoxy compounds can be 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, for example.
- an epoxy resin cresol novolak-type epoxy resin, a phenol novolak-type epoxy resin, etc. can be illustrated.
- 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” means a functional group having an aliphatic saturated hydrocarbon ring, and 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 contain an alicyclic epoxy group but also contains three or more epoxy groups or three epoxy groups, in consideration of curability, weather resistance and refractive index characteristics, but is not limited thereto.
- an aromatic epoxy compound As an aromatic epoxy compound, As an aromatic epoxy compound containing an aromatic group in a molecule
- Bisphenol-type epoxy resins such as a 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 cationically polymerizable functional group may also be exemplified, and such a compound may be used as a component capable of improving adhesion by controlling 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 couple
- R ⁇ 2> is hydrogen, a hydroxyl group, an alkyl group, or an alkoxy group as a functional group couple
- n is a number of 1-4.
- an alkenyl group such as a vinyl group, a cyclic ether group such as a glycidyl group or an oxetanyl group or a vinyloxy group or the like, or the alkenyl group, a cyclic ether group or a vinyloxy group Functional groups and the like can be exemplified.
- N in Formula 3 may be, for example, 1 or 2.
- silane compound an oligomer-type silane compound in which the cationically polymerizable functional group is introduced into a molecule of a siloxane oligomer which is a low molecular weight silicone resin whose 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 in Formula 4 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 refer to a structure of 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.
- heterocyclic acetal structure may refer to 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, for example, a compound 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.
- Heterocyclic acetal structures may contain 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 .
- 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 each independently represent a carbon atom or an oxygen atom
- two of Q, P, R and T are oxygen
- a and B each independently represent an alkylene group or alkylidene group having 1 to 5 carbon atoms.
- R 6 represents hydrogen or an alkyl group
- R 7 is a monovalent residue derived from the structure of formula (5) or (6) or an alkyl group substituted with the monovalent residue.
- Examples of the compound represented by the formula (7) include (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) It 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 from 0 to 5 .
- aryl group may refer to a monovalent moiety derived from a compound or a derivative thereof including benzene or a structure containing two or more benzenes condensed or bonded, unless otherwise specified.
- the aryl group may be, for example, an aryl group having 6 to 22 carbon atoms, 6 to 16 carbon atoms, or 6 to 13 carbon atoms, and for example, a phenyl group, phenylethyl group, phenylpropyl group, benzyl group, tolyl group, and xylyl group. (xylyl group) or a naphthyl group.
- N in Formula 8 may be, for example, a number of 0 to 3 or 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 be, for example, an alkylene group having 1 to 4 carbon atoms
- beta-carboxyethyl (meth) acrylate may be exemplified
- Q may be, for example, an alkyl group having 1 to 4 carbon atoms
- U and W may be each independently 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, for example, an aliphatic saturated hydrocarbon cyclic compound having 3 to 20 carbon atoms, 6 to 15 carbon atoms, or 8 to 12 carbon atoms.
- Examples of such monovalent residues include isobornyl group, cyclohexyl group, norbornanyl group, norbornanyl group, norbornenyl group, dicyclopentadienyl group, ethynylcyclohexane group, and ethynyl
- a cyclohexene group or an ethynyl decahydronaphthalene group may be exemplified, and in one example, an isobornyl group may be used, but is not limited thereto.
- an isocyanate functional acrylic ester compound may also be used.
- any compound may be used without particular limitation, as long as it is a compound containing an isocyanate group and an acryl group at the same time.
- an isocyanate-functional aliphatic acrylic ester can be used, and for example, a compound represented by the following formula (12) can 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, 2 to 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, or 1 to 4 carbon atoms.
- Aliphatic hydrocarbon groups may be used.
- the divalent hydrocarbon group include a linear, branched or cyclic alkylene group or alkynylene group; Linear, branched or cyclic alkenylene groups; Or linear, branched or cyclic alkynylene groups.
- the hydrocarbon group may be, for example, a linear or branched alkylene group or alkynylene group having 1 to 8 carbon atoms.
- Examples of the compound include (meth) acryloyloxyalkyl isocyanate and the like, and (meth) acryloyloxy (C 1-8 ) alkyl isocyanate and (meth) acryloyloxy (C 1-4 ) Alkyl isocyanate or (meth) acryloyloxyethyl isocyanate, etc. may be illustrated, 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.
- the compound represented by following formula (13) can also be used, for example.
- R represents hydrogen or an alkyl group
- Z represents a tetravalent hydrocarbon group
- a tetravalent hydrocarbon group for example, a tetravalent aliphatic hydrocarbon group can be used, and specifically, a tetravalent aliphatic hydrocarbon 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.
- Groups can be used.
- the hydrocarbon group may be, for example, a tetravalent hydrocarbon group derived from straight or branched alkanes 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 including a mixture of a compound and a hybrid curable adhesive composition including 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 phosphine oxide compound etc. can be used.
- 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, if necessary, 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 polarizing plate may be directly attached to the adhesive layer, and, if necessary, may further include a primer layer between the polarizing plate and the adhesive layer or between the liquid crystal layer and the adhesive layer.
- 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 first and second pressure sensitive adhesive layers has a storage modulus of at least 0.02 MPa, at least 0.03 MPa, at least 0.04 MPa, at least 0.05 MPa, and at least 0.06 MPa at 25 ° C. At least 0.07 MPa, at least 0.08 MPa, at least 0.08 MPa, or at least 0.09 MPa.
- the second pressure sensitive adhesive layer may have a storage modulus of the above range. When the first and / or second pressure sensitive adhesive has a storage modulus in the above range, the upper limit of the storage modulus 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.
- At least the second pressure-sensitive adhesive layer in the optical device may have a storage modulus in the above range, and in another example, may exhibit a storage modulus exceeding 0.08 MPa.
- the optical element When the first and / or second pressure-sensitive adhesive layer exhibits the storage modulus, the optical element exhibits excellent durability, and thus, for example, the phase retardation characteristic of the liquid crystal layer is stably maintained for a long time and even under severe conditions, and thus is stable. Light splitting characteristics can be exhibited and side effects such as light leakage can be prevented in an 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 first and / or second pressure sensitive adhesive layer may have a thickness of 25 ⁇ m or less, 20 ⁇ m or less, or 18 ⁇ m or less.
- the pressure-sensitive adhesive layer has the thickness, 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
- 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 whose molecular weight is 500,000 or more can be used, for example.
- 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
- acrylic polymer other various monomers may be included as polymerized units as necessary.
- the acrylic polymer may further include a compound represented by the following Formula 14 as a polymerized unit.
- R represents hydrogen or an alkyl group
- A represents an alkylene group or an alkylidene group
- R 16 represents an alkyl group or an aryl group
- n represents a number from 1 to 6.
- n may be 1 to 25, 1 to 15, or 1 to 6 in another example.
- an alkoxy alkylene glycol (meth) acrylic acid ester, alkoxy dialkylene glycol (meth) acrylic acid ester, alkoxy trialkylene glycol (meth) acrylic acid ester, alkoxy tetraalkylene glycol (meth) acrylic acid ester, Alkoxy polyethylene glycol (meth) acrylic acid ester, phenoxy alkylene glycol (meth) acrylic acid ester, phenoxy dialkylene glycol (meth) acrylic acid ester, phenoxy trialkylene glycol (meth) acrylic acid ester, phenoxy tetraalkylene glycol (Meth) acrylic acid ester or phenoxy polyalkylene glycol (meth) acrylic acid ester, etc. can be illustrated.
- the ratio may be appropriately adjusted according to the purpose, for example, it may be included in 10 to 50 parts by weight relative to the weight of the other monomers.
- the polymer may be, for example, 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 optional monomers such as carboxylic acid vinyl esters such as vinyl acetate, and the like as polymerized units. 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.
- 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 optional monomers such as carb
- 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 may 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. 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 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 first or second pressure sensitive adhesive layer may be formed by selecting an appropriate kind from the above-described types of pressure sensitive adhesives.
- the second pressure sensitive adhesive layer may be a pressure sensitive adhesive layer including at least the IPN
- the first pressure sensitive adhesive layer may be a crosslinked structure of a thermosetting component, that is, a crosslinked acrylic polymer crosslinked by a multifunctional crosslinking agent. It may be an adhesive layer having a structure or an adhesive layer including the IPN.
- the storage elastic modulus and the kind of the first or second pressure sensitive adhesive layer a more suitable kind may be selected according to the specific structure of the optical element.
- the surface treatment layer may be formed in the optical element.
- the optical element may further include a base layer (hereinafter referred to as a protective base layer) on which a surface treatment layer is formed.
- the other surface of the protective substrate layer in which the surface treatment layer is formed on one surface, that is, the surface on which the surface treatment layer is not formed, is, for example, the substrate layer (hereinafter referred to as the first substrate layer) described above, that is, the alignment layer. It may be attached to the base material layer formed in the lower portion as an adhesive layer (hereinafter, third adhesive layer).
- a base layer selected within the same category as the first base layer described above may be used.
- the second 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, and 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.
- the second pressure sensitive adhesive layer may be a pressure sensitive adhesive layer containing the IPN.
- the first pressure sensitive adhesive layer may be a pressure sensitive adhesive layer including an IPN or a pressure sensitive adhesive layer including a crosslinked structure of the thermosetting component.
- the first adhesive layer may have a storage modulus at 25 ° C. of 0.02 MPa or more, 0.05 MPa or more, or more than 0.08 MPa.
- the 1st adhesive layer is an adhesive layer containing the crosslinked structure of a thermosetting component
- the storage elastic modulus in 25 degreeC is adjusted in the range of 0.02 MPa-0.08 MPa or 0.04 MPa-0.08 MPa, and is an adhesive layer containing IPN, 25
- the storage modulus at < RTI ID 0.0 > C < / RTI > exceeds 0.08 MPa, and can be adjusted in the range of 0.25 MPa or less, in the range of 0.09 MPa to 0.2 MPa or 0.09 MPa to 0.16 MPa.
- an adhesive having a storage modulus and a crosslinking component in the same category as the first or second pressure sensitive adhesive layer may be used.
- the third 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, in a range of 0.25 MPa or less, 0.09 MPa to 0.2 MPa or 0.09
- a pressure-sensitive adhesive layer of MPa to 0.16 MPa, and a pressure-sensitive adhesive layer containing IPN can be used.
- the surface treatment layer may be formed on the surface of the first substrate layer, for example, on the surface opposite to the surface on which the liquid crystal layer or the alignment layer is formed in the first substrate layer.
- the protective base layer or the third pressure-sensitive adhesive layer may not be formed in the optical element.
- the second 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, and 0.25 MPa or less, 0.09 MPa to 0.2 MPa or 0.09 MPa It may be a pressure-sensitive adhesive layer of 0.16 MPa, the first pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer having a storage modulus of 0.02 MPa to 0.08 MPa or 0.04 MPa to 0.08 MPa at 25 °C.
- the second pressure sensitive adhesive layer may be a pressure sensitive adhesive layer including the IPN, and the first pressure sensitive adhesive layer may be a pressure sensitive adhesive layer including a crosslinked structure of the thermosetting component.
- 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 surface treatment layer may be formed on one main surface or both main surfaces of the base layer, or if necessary, may be performed on the entire surface including the side surface of the base layer.
- 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 may be a component known in the art as a so-called active energy ray polymerizable oligomer such as urethane acrylate, epoxy acrylate, ether acrylate or ester acrylate, or a mixture comprising monomers such as (meth) acrylic acid ester monomers and the like.
- the polymer of may 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.
- 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 multifunctional acrylate an appropriate kind may be selected from the compounds described in the pressure-sensitive adhesive section.
- 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 on which an uneven surface is formed, and the particles have a refractive index different from that of the resin layer.
- grains can be used.
- the resin layer used for formation of the said high hardness layer can be used, for example.
- 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 can also be implemented using particles having a refractive index different from 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 materials known from Japanese Patent Application No. 2008-0101801 or 2009-0049557 may also be used.
- the surface treatment layer may be formed alone or in combination of two or more thereof.
- the case where a high hardness layer is formed first on the surface of a base material layer and a low reflection layer is formed again on the surface can be illustrated.
- the optical element can also satisfy the condition of the following general formula (2).
- Y represents the width or width of the optical element measured after attaching the optical element to the glass substrate with the second pressure-sensitive adhesive layer, and maintained at 60 ° C. and 10% relative humidity for 150 hours, 300 hours, or 500 hours.
- Y may also be, for example, 170 nm or less, 150 nm or less, 130 nm or less, 110 nm or less, 90 nm or less, 70 nm or less, 50 nm or less, or 40 nm or less.
- the present application also relates to a stereoscopic image display device.
- An exemplary stereoscopic image display device may include the optical element.
- the stereoscopic image display apparatus may further include an image 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).
- the liquid crystal layer of the optical element may comprise the first and second regions described above. In the optical device, any one of the first and second regions of the liquid crystal layer may transmit the L signal, and the other region may be disposed such that the R signal may transmit the second adhesive layer. It may be attached to the display element.
- the optical element may be arranged such that the R and L signals are emitted from the display element to pass through the polarizing plate of the optical element first and then enter the respective regions 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. 7 exemplarily shows a device as an example device, in which an observer can wear a polarized glasses and observe a stereoscopic image.
- the apparatus includes, for example, a light source 401, a polarizing plate 402, and the image display element 403, and includes a second pressure sensitive adhesive layer 302, a polarizing plate 201, and a liquid crystal.
- the optical device including the layer 101 in sequence may be attached to the display device 403 by the second pressure-sensitive adhesive layer 302.
- the light source 401 for example, a direct type or edge type backlight generally used in a liquid crystal display (LCD) or the like may be used.
- LCD liquid crystal display
- the display element 403 may be a transmissive liquid crystal display panel including a plurality of unit pixels arranged in a row, column, or matrix 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 arranged adjacent to each other while having a stripe shape extending in a common direction as shown in FIG. 8, or alternately arranged adjacent to each other while forming a lattice pattern as illustrated in FIG. 9.
- the first and second regions are LC or RC regions, respectively, and the R signal transmitted from the RG region is RC through the polarizer 201 in consideration of the arrangement of the RG and LG regions.
- the L signal may be disposed to be incident to the region, and the L signal may be incident to the LC region through the polarizer 201.
- the image display element 403 is, for example, a first transparent substrate, a pixel electrode, a first alignment film, a liquid crystal layer, a second alignment film, a common electrode, a color filter, and a second transparent arranged sequentially from the light source 401 side direction. It may be a liquid crystal panel including a substrate or the like.
- the polarizing plate 402 may be attached to the light incident side of the panel, that is, the light source 401, and the optical element may be attached to the opposite side of the panel.
- the polarizer included in the polarizing plate 402 and the polarizer included in the polarizing plate 201 of the optical element may be disposed such that, for example, both absorption axes form a predetermined angle, for example, 90 degrees. As a result, the light may be transmitted or blocked through the display element 403 emitted from the light source 401.
- light unpolarized from the light source 401 of the display device 8 may be emitted toward the polarizer 402.
- the polarizer 402 light having a polarization axis in a direction parallel to the light transmission axis of the polarizer of the polarizer 402 may pass through the polarizer 402 and enter the display element 403.
- Light incident on the display element 403 and passing through the RG region becomes an R signal
- light passing through the LG region becomes an L signal and is incident on the polarizing plate 201 of the optical element.
- the light transmitted through the LC region and the light transmitted through the RC region are respectively emitted in 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 application may be a light splitting element, for example, an element that divides incident light into two or more kinds of light having different polarization states.
- the optical element may be used to implement, for example, a stereoscopic image.
- 1 and 2 exemplarily show the arrangement of the first and second regions of the liquid crystal layer.
- FIG 3 is an exemplary diagram for explaining the arrangement of the optical axes of the first and second regions.
- FIG. 7 is a diagram illustrating a stereoscopic image display device by way of example.
- FIGS. 8 and 9 are schematic diagrams showing the arrangement of the RG region and the LG region.
- A, B first and second regions of the liquid crystal layer
- LG Video signal generation area for left eye
- RG video signal generation area for right eye
- 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 durability of the liquid crystal layer was evaluated by measuring the rate of change of the phase difference value generated after the endurance test for the optical elements manufactured in Examples and Comparative Examples. After the optical element was cut to have a length of 10 cm in length and length, it was attached to the glass substrate with an adhesive layer, and left at 100 ° C. for 100 hours or 250 hours at 80 ° C., and the liquid crystal layer before being left under the heat-resistant condition. The amount of reduction of the phase difference value after standing with respect to the phase difference value of was converted into a percentage and used for durability evaluation.
- the criteria at the time of durability evaluation are as follows.
- the crosstalk rate at the time of observing the stereoscopic image may be defined as a ratio of luminance in a dark state and a bright stat.
- the crosstalk rate is measured in the following manner. An optical element is used to construct a stereoscopic image display device as shown in FIG. Thereafter, the polarizing glasses for stereoscopic image observation are placed at the normal observation point of the stereoscopic image display apparatus.
- the observation point when the observer observes a stereoscopic image, the observation point is a distance that is 3/2 times the length of the horizontal direction of the stereoscopic image display device from the center of the stereoscopic image display device.
- the horizontal length of the stereoscopic image display device may be a horizontal length based on the observer, for example, a horizontal length of the image display device when a viewer observes a stereoscopic image. .
- a luminance meter (equipment name: SR-UL2 Spectrometer) is disposed on the back of the left and right eye lenses of the polarizing glasses, and the luminance in each case Measure The luminance measured at the back of the left eye lens is the brightness of the bright state, and the luminance measured at the back of the lens of the right eye is the brightness of the dark state.
- the ratio of the luminance of the dark state to the luminance of the bright state [luminance in the dark state] / [luminance in the bright state]) can be obtained as a percentage, and this can be defined as the crosstalk rate (Y). have.
- the crosstalk rate may also be measured in the same manner as described above, and may be measured by obtaining luminance in a light and dark state while the stereoscopic image display device is outputting an R signal.
- the brightness measured at the back of the left eye lens is the brightness of the dark state
- the brightness measured at the back of the right eye lens is the brightness of the bright state. have.
- the measurement of the horizontal or vertical length of the optical device was performed using the premium 600C and IView Pro programs of Intec IMS Inc., which are three-dimensional measuring instruments.
- the thickness measurement of the liquid crystal layer was measured using a spectral reflectometer, which is an equipment that can evaluate the characteristics of the thin film using an interference phenomenon or a phase difference of light between the reflected light on the thin film surface and the light reflected at the lower interface.
- the composition for forming a photo-alignment layer 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.
- the dried photoalignment layer-forming composition is subjected to alignment treatment according to the method disclosed in Korean Patent Application No. 2010-0009723, to form a photoalignment layer including first and second alignment regions oriented in different directions. It was.
- 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 polarizations are transmitted on the pattern mask, respectively.
- a polarizing plate on which two regions to be formed were placed.
- 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 oriented according to the alignment, and then irradiated with ultraviolet (300 mW / cm 2 ) for about 10 seconds to crosslink and polymerize the liquid crystal to align the lower photoalignment layer.
- the difference between the refractive index in the slow axis direction and the refractive index in the fast axis direction was about 0.125.
- a liquid crystal layer was formed in the same manner as in Preparation Example 1, but after the liquid crystal layer was formed, the composition of the liquid crystal mixture was adjusted so that the difference in refractive index was 0.03 in the slow axis direction and the fast axis direction, so that the thickness was about 0.3 ⁇ m and 1 ⁇ m. And 2.5 ⁇ m of liquid crystal layers were formed (Preparation Examples 2 to 4).
- a liquid crystal layer was prepared in the same manner using the same liquid crystal compound as in Preparation Example 1, except that liquid crystal layers having a thickness of about 0.3 ⁇ m and 2.5 ⁇ m were formed (Preparation Examples 5 and 6), respectively.
- a liquid crystal layer was formed in the same manner as in Preparation Example 1, but after the liquid crystal layer was formed, the composition of the liquid crystal mixture was adjusted to have a refractive index of 0.22 in the slow axis direction and the fast axis direction, so that the thickness was about 0.3 ⁇ m and 1 ⁇ m. And 2.5 ⁇ m of liquid crystal layers were formed (Preparation Examples 7 to 9).
- Preparation Example Differences in the thickness and refractive index of each liquid crystal layer are shown in Table 1 below.
- a liquid crystal layer was formed in the same manner as in Preparation Example 1, except that 55 parts by weight of the polyfunctional polymerizable liquid crystal compound (Chemical Formula A) and 45 parts by weight of the monofunctional polymerizable liquid crystal compound (Chemical Formula B) were mixed in the preparation of the liquid crystal composition.
- a liquid crystal layer was prepared in the same manner as in 1. The difference between the refractive index in the slow axis direction and the fast axis direction in the liquid crystal layer was about 0.125, and the thickness of the liquid crystal layer was 1 ⁇ m.
- An optical device was manufactured in the following manner.
- General structure including a polyvinyl alcohol polarizer and a polarizer protective film (TAC film) formed on both sides of the liquid crystal layer on one surface of the structure manufactured in Preparation Example 1, that is, a structure in which the TAC substrate, the alignment layer, and the liquid crystal layer are sequentially formed. It adhere
- TAC film polarizer protective film
- a conventional acrylic pressure-sensitive adhesive layer is formed on one surface of the polarizer protective film of the polarizing plate, and the TAC base material, alignment layer, liquid crystal layer, pressure-sensitive adhesive layer, TAC film (polarizer protective film), polyvinyl alcohol polarizer, TAC film (polarizer protection)
- TAC base material alignment layer
- liquid crystal layer liquid crystal layer
- pressure-sensitive adhesive layer TAC film (polarizer protective film)
- TAC film polarizer protective film
- polyvinyl alcohol polarizer polyvinyl alcohol polarizer
- TAC film polarizer protection
- An optical device was manufactured in the same manner as in Example 1, except that the liquid crystal layers prepared in Preparation Examples 2 to 9 were used, respectively.
- the durability and crosstalk rate of the liquid crystal layer were evaluated for the optical devices manufactured in Examples and Comparative Examples, and are shown in Table 2 below.
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Abstract
Description
굴절률의 차이 | 두께(㎛) | ||
제조예 2 | 액정층(B) | 0.03 | 0.3 |
제조예 3 | 액정층(C) | 0.03 | 1 |
제조예 4 | 액정층(D) | 0.03 | 2.5 |
제조예 5 | 액정층(E) | 0.125 | 0.3 |
제조예 6 | 액정층(F) | 0.125 | 2.5 |
제조예 7 | 액정층(G) | 0.22 | 0.3 |
제조예 8 | 액정층(H) | 0.22 | 1 |
제조예 9 | 액정층(I) | 0.22 | 2.5 |
굴절률 차이: 액정층의 며면내 지상축 방향의 굴절률과 진상축 방향의 굴절률의 차이 |
액정층 | 크로스토크율(%) | 액정층내구성 | |||
굴절률 차이 | 두께(㎛) | ||||
실시예 1 | 액정층(A) | 0.125 | 1 | 0.5 | ○ |
실시예 2 | 액정층(J) | 0.125 | 1 | 0.5 | ○ |
비교예 1 | 액정층(B) | 0.03 | 0.3 | 79.5 | ○ |
비교예 2 | 액정층(C) | 0.03 | 1 | 45.3 | ○ |
비교예 3 | 액정층(D) | 0.03 | 2.5 | 10.3 | ○ |
비교예 4 | 액정층(E) | 0.125 | 0.3 | 36 | ○ |
비교예 5 | 액정층(F) | 0.125 | 2.5 | 177.4 | ○ |
비교예 6 | 액정층(G) | 0.22 | 0.3 | 14.6 | ○ |
비교예 7 | 액정층(H) | 0.22 | 1 | 30.7 | ○ |
비교예 8 | 액정층(I) | 0.22 | 2.5 | 121.6 | ○ |
Claims (15)
- 액정 화합물을 포함하고, 면 내 지상축 방향의 굴절률과 진상축 방향의 굴절률의 차이가 0.05 내지 0.2이며, 두께가 0.5 ㎛ 내지 2.0 ㎛인 액정층을 포함하는 광학 소자.
- 제 1 항에 있어서, 액정층은 하기 일반식 1을 만족하는 광학 소자:[일반식 1]X < 8%상기 일반식 1에서 X는 상기 액정층의 초기 위상차 수치 대비 상기 액정층을 80℃에서 100시간 동안 방치한 후의 상기 액정층의 위상차 수치의 변화량의 절대값의 백분율이다.
- 제 1 항에 있어서, 액정층은 단관능성 중합성 액정 화합물 및 다관능성 중합성 액정 화합물을 포함하는 광학 소자.
- 제 3 항에 있어서, 액정층은, 단관능성 중합성 액정 화합물을 다관능성 중합성 액정 화합물을 100 중량부 대비 100 중량부 이하로 포함하는 광학 소자.
- 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 치환기이거나, R1 내지 R5 중 인접하는 2개의 치환기의 쌍 또는 R6 내지 R10 중 인접하는 2개의 치환기의 쌍은 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하되, 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 치환기 중 적어도 하나의 쌍은 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하고, 상기에서 Q는 알킬렌기 또는 알킬리덴기이며, P는, 알케닐기, 에폭시기, 시아노기, 카복실기, 아크릴로일기, 메타크릴로일기, 아크릴로일옥시기 또는 메타크릴로일옥시기 등의 중합성 관능기이다.[화학식 2]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-P이거나, R11 내지 R15 중 인접하는 2개의 치환기의 쌍은 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하되, R11 내지 R15 중 적어도 하나가 -O-Q-P이거나, R11 내지 R15 중 인접하는 2개의 치환기의 쌍은 서로 연결되어 -O-Q-P로 치환된 벤젠을 형성하고, 상기에서 Q는 알킬렌기 또는 알킬리덴기이며, P는, 알케닐기, 에폭시기, 시아노기, 카복실기, 아크릴로일기, 메타크릴로일기, 아크릴로일옥시기 또는 메타크릴로일옥시기 등의 중합성 관능기이다.
- 제 1 항에 있어서, 액정 화합물은 수평 배향된 상태로 액정층에 포함되어 있는 광학 소자.
- 제 1 항에 있어서, 액정층에는, 서로 상이한 위상 지연 특성을 가지는 제 1 및 제 2 영역이 형성되어 있는 광학 소자.
- 제 1 항에 있어서, 기재층을 추가로 포함하고, 액정층이 상기 기재층의 일면에 형성되어 있는 광학 소자.
- 제 8 항에 있어서, 기재층과 액정층의 사이에 배향층을 추가로 포함하는 광학 소자.
- 제 1 항에 있어서, 액정층에 부착되어 있으며, 편광자를 포함하는 편광판을 추가로 포함하는 광학 소자.
- 제 10 항에 있어서, 액정층에는, 서로 상이한 방향으로 형성된 광축을 가지는 제 1 및 제 2 영역이 형성되어 있고, 상기 제 1 영역의 광축과 상기 제 2 영역의 광축이 이루는 각도를 이등분하는 선은 편광자의 광 흡수축과 수직 또는 수평을 이루는 광학 소자.
- 제 10 항에 있어서, 편광판은 접착제층 또는 점착제층에 의해 액정층에 부착되어 있는 광학 소자.
- 제 1 항의 광학 소자를 포함하는 입체 영상 표시 장치.
- 제 13 항에 있어서, 좌안용 영상 신호와 우안용 영상 신호를 생성할 수 있는 영상 표시 소자를 추가로 포함하는 입체 영상 표시 장치.
- 제 13 항에 있어서, 광학 소자의 액정층에는, 서로 위상 지연 특성이 상이한 제 1 및 제 2 영역이 형성되어 있고, 광학 소자는, 상기 제 1 및 제 2 영역 중 어느 하나의 영역은 좌안용 영상 신호가 투과될 수 있고, 다른 하나의 영역은 우안용 영상 신호가 투과될 수 있도록 배치되어 있는 입체 영상 표시 장치.
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CN201280055727.9A CN103930820B (zh) | 2011-11-17 | 2012-11-19 | 光学器件 |
JP2014539885A JP6029246B2 (ja) | 2011-11-17 | 2012-11-19 | 光学素子およびこれを含む立体映像表示装置 |
US13/691,189 US9329426B2 (en) | 2011-11-17 | 2012-11-30 | Optical element |
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KR1020120131004A KR101472187B1 (ko) | 2011-11-17 | 2012-11-19 | 광학 소자 |
KR10-2012-0131004 | 2012-11-19 |
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US13/691,189 Continuation US9329426B2 (en) | 2011-11-17 | 2012-11-30 | Optical element |
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