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WO2018155787A1 - Stratifié de fenêtre à polariseur intégré et dispositif d'affichage d'image l'incluant - Google Patents

Stratifié de fenêtre à polariseur intégré et dispositif d'affichage d'image l'incluant Download PDF

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Publication number
WO2018155787A1
WO2018155787A1 PCT/KR2017/013152 KR2017013152W WO2018155787A1 WO 2018155787 A1 WO2018155787 A1 WO 2018155787A1 KR 2017013152 W KR2017013152 W KR 2017013152W WO 2018155787 A1 WO2018155787 A1 WO 2018155787A1
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WO
WIPO (PCT)
Prior art keywords
polarizing plate
window
film
adhesive layer
surface energy
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PCT/KR2017/013152
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English (en)
Korean (ko)
Inventor
강대산
임종관
Original Assignee
동우화인켐 주식회사
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Publication of WO2018155787A1 publication Critical patent/WO2018155787A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a polarizing plate integrated window laminate and an image display device including the same.
  • the display device includes a liquid crystal display (LCD) device, an organic light emitting display (OLED) device, a plasma display panel (PDP) device, and a field emission display (FED) device. ) Devices and the like.
  • LCD liquid crystal display
  • OLED organic light emitting display
  • PDP plasma display panel
  • FED field emission display
  • a window substrate may be disposed on the display panel such as an LCD panel and an OLED panel to protect the display panel from an external environment.
  • the window substrate is formed of a glass material, and as the flexible display is recently developed, a transparent plastic material is used as the window substrate.
  • additional members of a display device such as a polarizer and a touch screen panel may be disposed between the window substrate and the display panel.
  • a polarizer and a touch screen panel may be disposed between the window substrate and the display panel.
  • external light reflected from the electrode pattern of the display panel may be blocked by the polarizer.
  • the user's command may be input through the touch screen panel.
  • Korean Patent Publication No. 2012-0076026 discloses a transparent substrate including a touch screen panel including a polarization layer.
  • One object of the present invention is to provide a polarizing plate-integrated window laminate having improved mechanical reliability and flexible properties.
  • One object of the present invention is to provide an image display device including a polarizing plate-integrated window laminate having improved mechanical reliability and flexible characteristics.
  • a represents the surface energy of the polarizing plate
  • a ' represents the surface energy of the window film
  • b represents the surface energy of the adhesive layer.
  • the adhesive layer comprises an acrylic optical transparent adhesive agent (OCA), polarizing plate integrated window laminate.
  • OCA acrylic optical transparent adhesive agent
  • the polarizing plate comprises a first protective film and a polarizer
  • the surface energy of the polarizing plate is measured on the surface of the first protective film, polarizing plate integrated window laminate.
  • the first protective film is in contact with the adhesive layer, comprising a cyclic olefin-based polymer (COP), polarizing plate integrated window laminate.
  • COP cyclic olefin-based polymer
  • the second protective film comprises a COP film or retardation film, polarizing plate integrated window laminate.
  • the polarizing plate or the adhesive layer is corona treated, polarizing plate integrated window laminate.
  • the storage modulus of the increasingly adhesion layer is 0.01 to 0.5 Mpa in the temperature range of -20 to 80 °C, polarizing plate integrated window laminate.
  • the window laminate of the present invention includes a window film and a polarizing plate bonded to each other by an adhesive layer, and can secure excellent room temperature adhesiveness and moisture resistance adhesive strength through surface energy control in each of the window film, the adhesive layer, and the polarizing plate. have.
  • the window stack may be effectively applied as a window or cover member of the flexible display.
  • FIG. 1 is a schematic cross-sectional view illustrating a window stack according to exemplary embodiments of the present invention.
  • FIG. 2 is a schematic diagram showing a contact angle measurement for surface energy calculation.
  • 3 and 4 are schematic cross-sectional views illustrating a window stack in accordance with some example embodiments.
  • the present invention includes a window film, and an adhesive layer and a polarizing plate sequentially stacked on one surface of the window film, wherein the adhesive layer is provided with a window laminate that satisfies the adhesive force according to a specific formula.
  • the window laminate has improved adhesion, peeling resistance, and bending characteristics at room temperature, high temperature, and high humidity, and can be effectively applied to a flexible display.
  • 1 is a schematic cross-sectional view illustrating a window stack according to exemplary embodiments of the present invention.
  • 2 is a schematic diagram showing a contact angle measurement for surface energy calculation.
  • the window stack may include an adhesive layer 120 and a polarizer 150 sequentially stacked on the window film 100.
  • the window laminate may be a polarizing plate-integrated window laminate in which the window film 100 and the polarizing plate 150 are integrally bonded.
  • the window film 100 may be applied to, for example, an LCD device, an OLED device, a touch screen panel (TSP), or the like, and may include a material having durability against external impact and transparency that a user can see.
  • the window film 100 may include a plastic material having a predetermined flexibility.
  • the display device to which the window stack is applied may be provided as a flexible display.
  • the window film 100 may include a glass material in which a flexible property is implemented.
  • the window film 100 may be formed to include polyimide.
  • the window film 100 including the polyimide may be formed by curing a composition including the polyimide precursor.
  • the polyimide precursor may include dihydrides such as tetra carboxylic acid dianhydride and aromatic diamines.
  • a polyamic acid (PAA) is prepared, and the imidization reaction may proceed by the nitrogen atom of the amide of the polyamic acid attacking the carbon atom of the carboxyl group by heat treatment or an appropriate catalytic reaction.
  • PAA polyamic acid
  • the window film 100 including the polyimide may be manufactured.
  • the imidization ratio may be adjusted in consideration of the improved moisture barrier performance and flexibility of the window film 100, and the surface energy of the window film 100 may vary according to the imidization ratio.
  • hydrophobic components can be introduced into the polyimide.
  • the window film 100 may be prepared by introducing a fluoro methyl component into the polyimide molecule or by mixing silica particles. In this case, the surface energy of the window film 100 may change according to the content of the hydrophobic component.
  • the window film 100 may include one surface 100b and the other surface 100a.
  • one surface 100b and the other surface 100a may be surfaces facing each other.
  • one surface 100b may correspond to a lower surface of the substrate 100
  • the other surface 100a may correspond to an upper surface of the substrate 100.
  • the other surface 100a may be an exposed surface or a viewing surface of the window film 100 when the window stack is applied to the image display device. For example, an image is implemented to the user on the other surface 100a side of the window film 100, and a user's command (eg, through a touch) may be input.
  • One surface 100b of the window film 100 faces the display panel, for example, and additional layers and / or structures of the window stack may be stacked on the surface 100b.
  • the adhesive layer 120 may be formed on one surface 100b of the window film 100.
  • the term "adhesive layer” is used to encompass the adhesive layer and the adhesive layer.
  • the adhesive layer 120 may be formed using a pressure sensitive adhesive (PSA) composition or an optically clear adhesive (OCA) composition.
  • PSA pressure sensitive adhesive
  • OCA optically clear adhesive
  • the adhesive layer 120 may have an appropriate adhesive force to prevent peeling, bubbles, etc. when bending occurs in the window stack, and may have viscoelastic properties applicable to the flexible display.
  • the storage modulus of the increasingly adhesion layer 120 may be about 0.01 to 0.5 Mpa in the temperature range of about -20 to 80 °C.
  • the adhesive force of the adhesive layer 120 may be maintained without peeling or lifting by the adhesive layer 120 within the storage elastic modulus range.
  • the adhesive layer 120 may be formed using an acrylic or silicone OCA composition.
  • the acrylic OCA composition may include a (meth) acrylic acid ester copolymer, a crosslinking agent, and a solvent.
  • the (meth) acrylic acid ester copolymer may be prepared by copolymerizing a (meth) acrylic acid ester, an alkoxysilyl group-containing monomer, and a functional monomer.
  • the type of the crosslinking agent is not particularly limited and may be appropriately selected and used among those commonly used in the art.
  • the crosslinking agent may include a polyisocyanate compound, an epoxy resin, a melamine resin, a urea resin, a dialdehyde, a methylol polymer, and the like, and preferably a polyisocyanate compound may be used.
  • the solvent may include a conventional solvent used in the field of resin composition, for example, alcohol-based (methanol, ethanol, isopropanol, butanol, propylene glycol methoxy alcohol, etc.), ketone-based (methyl ethyl ketone, methyl butyl Ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, etc.), acetate type (methyl acetate, ethyl acetate, butyl acetate, propylene glycol methoxy acetate, etc.), cellosolve type (methyl cellosolve, ethyl cellosolve, propyl) Cellosolves, etc.), hydrocarbon-based (normal hexane, normal heptane, benzene, toluene, xylene, etc.) may be used. These may be used alone or in combination of two or more thereof.
  • alcohol-based methanol, ethanol, iso
  • the acrylic OCA composition may further include various known additives, for example, a plasticizer, a silane coupling agent, a light stabilizer, and the like, within a range that does not impair adhesion, durability, and viscoelastic properties of the adhesive layer 120.
  • various known additives for example, a plasticizer, a silane coupling agent, a light stabilizer, and the like, within a range that does not impair adhesion, durability, and viscoelastic properties of the adhesive layer 120.
  • the surface energy of the adhesive layer 120 may be changed or adjusted according to the content of the above-described monomers, the content of the crosslinking agent, the degree of crosslinking of the copolymer and the like.
  • the adhesive layer 120 does not cause lifting and peeling between the interfaces, and may satisfy room temperature adhesion and moisture resistance adhesion in a range described later in order to maintain adhesion in a harsh environment.
  • the polarizer 150 may be bonded to the window film 100 through the adhesive layer 120.
  • the OCA composition may be coated and cured on the upper surface of the polarizing plate 150 to form an adhesive layer 120, and the adhesive layer 120 may be attached to the window film 100.
  • the polarizing plate 150 may include a laminated structure of the first protective film 130 and the polarizer 140, and the first protective film 130 may be attached to the adhesive layer 120.
  • the first protective film 130 may be, for example, polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene terephthalate and the like; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Cyclic olefin polymer (COP) and the like.
  • the first protective film 130 may be a COP material film in consideration of transparency, mechanical strength, thermal stability, moisture shielding, isotropy.
  • the polarizer 140 may include, for example, a stretched polyvinyl alcohol (PVA) -based resin.
  • the polyvinyl alcohol-based resin may be preferably a polyvinyl alcohol-based resin obtained by saponifying a polyvinyl acetate-based resin.
  • As polyvinyl acetate type resin the copolymer etc. of vinyl acetate and the other monomer copolymerizable with this besides the polyvinyl acetate which is a homopolymer of vinyl acetate are mentioned.
  • the other monomers include unsaturated carboxylic acid type, unsaturated sulfonic acid type, olefin type, vinyl ether type, and acrylamide monomer having an ammonium group.
  • the polyvinyl alcohol-based resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes.
  • the surface contacting the adhesive layer 120 of the first protective film 130 may include, for example, roughness formed through surface treatment such as corona treatment, primer treatment, alkali treatment, and the like.
  • the surface of one surface 100b of the window film 100 and / or the adhesive layer 120 may also be surface treated.
  • the adhesive layer 120 may satisfy the following Equation 1.
  • Equation 1 Ya represents the room temperature adhesion of the adhesive layer 120, and Yb represents the moisture resistance adhesion of the increasingly adhesive layer 120.
  • Ya and Yb may be expressed in units of Newtons (N), respectively, in which case the sum of the room temperature adhesiveness and the moisture resistance adhesive strength of the adhesive layer 120 may exceed 20N.
  • the sum of Ya and Yb may be 25 or more.
  • Ya and Yb may be calculated through Equations 2 and 3 below, respectively.
  • a represents the surface energy of the polarizing plate 150.
  • a denotes surface energy measured on the upper surface of the first protective film 130.
  • a ' represents the surface energy of the window film 100.
  • a ' represents surface energy measured at one surface 100b of the window film 100.
  • b represents the surface energy of the adhesive layer 120.
  • the surface energy can be calculated through an empirical formula by measuring the contact angle.
  • a contact angle ⁇ may be measured by showing a tangent line at a contact point of the object and the droplet.
  • the contact angle is measured, and the contact angle is substituted into the empirical formula for the window film ( 100), the surface energy of each of the adhesive layer 120 and the polarizer 150 may be calculated.
  • the empirical formula is, for example, obtained by combining the empirical formula of Owen-Wendt and the equation of Young, can be represented by the following formula (4).
  • Equation 4 Represents the surface energy of the droplet, Represents the total surface energy of the object.
  • Superscript d represents the nonpolar component and p represents the polar component.
  • the total surface energy of the object may be calculated by Equation 5 below.
  • the contact angle is measured by using different first droplets and second droplets, and then substituted and coalesced in Equation 4 above.
  • the adhesive layer 120 and the polarizing plate 150 May be calculated to be used as the values of a ', b and a in Equations 2 and 3, respectively.
  • water may be used as the first droplet
  • di-iodomethane may be used as the second droplet
  • a / b is the first surface energy ratio and may be used as an indicator of room temperature adhesive force.
  • a '/ b is the second surface energy ratio and may be utilized as an index of moisture resistance adhesion.
  • the first surface energy ratio may be about 2 or less, and the second surface energy ratio may be about 3 or less.
  • the adhesive layer 120 satisfies the above-described formulas, and the interlayer peeling, cracking, deformation of optical properties, etc. when bending or folding occurs at high temperature and high humidity conditions as well as at room temperature conditions. It may not cause a defect. Therefore, a highly reliable and highly durable window laminate applicable to the flexible display can be implemented.
  • 3 and 4 are schematic cross-sectional views illustrating a window stack in accordance with some example embodiments.
  • the window stack may further include a hard coating layer 105.
  • the hard coating layer 105 may be formed on the other surface 100a of the window film 100. In this case, the surface of the hard coating layer 105 may be exposed to the user's viewing side.
  • the hard coating layer 105 is formed using a hard coating composition including a photocurable compound, a photoinitiator, and a solvent, thereby additionally securing excellent flexibility, wear resistance, and surface hardness of the window film 100.
  • the photocurable compound may include, for example, a siloxane compound, an acrylate compound, a compound having a (meth) acryloyl group or a vinyl group. These may be used alone or in combination of two or more thereof.
  • siloxane compound may include a polydimethylsiloxane (PDMS) compound.
  • PDMS polydimethylsiloxane
  • the siloxane compound may contain an epoxy group such as a glycidyl group. Accordingly, crosslinking or curing through epoxy ring opening may be promoted by light irradiation.
  • acrylate-based compound examples include dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate And (meth) acrylate containing an oxyethylene group, ester (meth) acrylate, ether (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, and the like.
  • Examples of the compound having a (meth) acryloyl group or a vinyl group include (meth) acrylic acid esters, N-vinyl compounds, vinyl-substituted aromatics, vinyl ethers and vinyl esters.
  • the photoinitiator is not particularly limited as long as the photoinitiator generates ions, Lewis acids or radicals by irradiation with active energy rays such as visible light, ultraviolet light, X-rays or electron beams to initiate the polymerization reaction of the photocurable compound.
  • active energy rays such as visible light, ultraviolet light, X-rays or electron beams to initiate the polymerization reaction of the photocurable compound.
  • the photoinitiator include onium salts such as aromatic diazonium salts, aromatic iodonium salts and aromatic sulfonium salts, acetphenone compounds, benzoin compounds, benzophenone compounds, thioxanthone compounds and the like.
  • the solvent may use a solvent substantially the same as or similar to that used in the PSA composition, and is not particularly limited.
  • the hard coating composition may further include a UV absorber.
  • the ultraviolet absorbent may be used without particular limitation as long as it is a compound capable of absorbing an ultraviolet wavelength of about 380 nm or less.
  • the ultraviolet absorber may include a benzoxazinone-based compound, a triazine-based compound, a benzotriazole-based compound, or a benzophenone-based compound. . These may be used alone or in combination of two or more. Accordingly, the UV transmittance is reduced by the hard coating layer 105 to improve the optical properties and visible light transmittance of the window laminate.
  • the window film may further include at least one functional layer applied to an image display device such as an anti-scattering film, an anti-fingerprint film, or the like.
  • the polarizer 155 may further include a second protective film 160.
  • the polarizing plate 155 has a laminated structure of the first protective film 130, the polarizer 140, and the second protective film 160, and the second protective film 160 has a first protective contact with the adhesive layer 120.
  • the film 130 may be opposite to each other.
  • the second protective film 160 may be formed of a material substantially the same as or similar to the first protective film 130.
  • the second protective film 160 may include an optical functional layer.
  • a retardation film is mentioned as an example of the said optical function layer.
  • the retardation film may be included as a functional layer for retarding the phase of light passing through the polarizer 140.
  • the material of the retardation film is not particularly limited, and may include a gradient stretched resin film, a liquid crystal coating layer, and the like.
  • the retardation film may comprise a ⁇ / 4 film.
  • the retardation film may have, for example, a multilayer structure in which a ⁇ / 4 film and a ⁇ / 2 film are laminated.
  • the window stack may further include a touch sensor layer 190.
  • the touch sensor layer 190 may include, for example, sensing electrodes 185 for converting a user's touch signal input through the window film 100 into an electrical signal.
  • the sensing electrodes may include first sensing electrodes and second sensing electrodes arranged to cross each other.
  • the sensing electrode 185 may include, for example, a transparent conductive material.
  • the transparent conductive material include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), cadmium tin oxide (CTO), and metal wires. These can be used individually or in combination of 2 or more types.
  • the electrode pattern may include ITO.
  • the metal used for the metal wire is not particularly limited, and may include, for example, silver, gold, aluminum, copper, iron, nickel, titanium, telenium, chromium, or an alloy thereof.
  • Peripheral wires connected to the sensing electrodes 185 may be further formed in the touch sensor layer 190.
  • the touch sensor layer 190 may be bonded to the polarizer 155 through the second adhesive layer 170.
  • the adhesive layer 120 described in FIGS. 1 and 3 is referred to as the first adhesive layer 120 in FIG. 4.
  • the sensing electrodes 185 may be formed on the substrate 187, and a passivation layer 180 may be formed on the substrate 187 to cover the sensing electrodes 185.
  • the touch sensor layer 190 may be coupled to the window stack in the form of a touch screen panel (TSP), for example.
  • TSP touch screen panel
  • the touch sensor layer 190 may be bonded to the polarizer 155 through the second adhesive layer 170.
  • Embodiments of the present invention further provide an image display apparatus including the above-described window stack.
  • the window stack may be combined with a display panel included in an OLED device, an LCD device, or the like.
  • the display panel may include a pixel circuit including a thin film transistor (TFT) arranged on a substrate, and a pixel portion or a light emitting portion electrically connected to the pixel circuit.
  • TFT thin film transistor
  • the display panel may include a base substrate including a flexible resin such as polyimide, and may be combined with the window stack to implement a flexible display device.
  • the window film 100 of the window laminate also includes a material having enhanced flexibility, such as polyimide, and has improved room temperature and moisture resistance adhesive strength by the adhesive layer 120 satisfying the above-described physical properties or formulas. Can be implemented. Therefore, mechanical durability and reliability may be maintained even when a stress due to folding or bending is applied to the flexible display device.
  • COP film was used as a protective film of a polarizing plate, and polyimide film was used as a window film.
  • the adhesive adhesive layer was formed using the acrylic OCA composition of Lintec.
  • the adhesive layer samples of Examples and Comparative Examples were prepared from different OCA compositions in terms of type and content of acrylate monomers.
  • the contact angle was measured using water and diiomethane, and the total surface energy of each of the protective film and the adhesive layer was calculated using Equations 4 and 5. Thereafter, the first surface energy ratio expressed by a / b in Equation 2 was calculated, and through this, the room temperature adhesive force of the adhesive layer was converted.
  • Contact angle was measured using a KSV Instruments (Model: CAM 101). Specifically, the average value was used after five measurements while changing the position of the drop.
  • the contact angle was measured using water and diiomethane for the window film and the adhesive layers, and total surface energy of each of the window film and the adhesive layer was calculated using Equations 4 and 5. Thereafter, a second surface energy ratio expressed by a '/ b in Equation 3 was calculated, and through this, the moisture resistance adhesion of the adhesive layer was converted.
  • a window laminate was manufactured by bonding the window film and the polarizing plate through the adhesive layer according to the above-described examples and comparative examples, and evaluated crack resistance and adhesion as follows.
  • a sample was prepared by cutting the window laminate to a size of 1 cm ⁇ 10 cm, and a bending test of 100,000 times was performed at a radius of curvature of 2 mm. Thereafter, the window laminate was visually evaluated for cracking. Evaluation criteria are as follows.
  • Adhesion was measured as follows.
  • n number of rectangles that do not peel out of the entire rectangle, 100: number of whole rectangles
  • the bending test according to the evaluation standard IEC-62715 was carried out using the bending evaluation equipment (DLDMLH-FS, manufactured by YUASA SYSTEM) for the window laminate according to the examples and the comparative examples. Specifically, 10,000 bending tests were performed on the window laminates at 60 ° C. and 90% relative humidity. After the bending test, the window laminates were evaluated for peeling and bubble generation as follows.
  • DLDMLH-FS bending evaluation equipment
  • Example 3 In addition, the best crack resistance, adhesion and flexural characteristics results were obtained in Example 3 in which the first surface energy ratio (a / b) was 2 or less and the second surface energy ratio (a '/ b) was 3 or less.
  • the surface energy was measured after performing surface treatment through corona treatment on the surfaces of the protective film, the adhesive layer and the window film of the window laminate of Comparative Example described above.
  • the measurement results are shown in Table 4. Specifically, corona treatment was performed at a spacing between the electrodes of 2 mm, a voltage of 8.61 kV and a treatment rate of 6 m / min.
  • the first surface energy ratio (a / b) was calculated as 1.7 and the second surface energy ratio (a '/ b) was calculated as 3.05.
  • Yb) was measured to be 12.81 and 16.87, respectively. Therefore, it was possible to improve the adhesive strength of the comparative example to satisfy the formula 1 through the surface treatment.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un stratifié de fenêtre à polariseur intégré, comportant: un film de fenêtre; et une couche à adhérence ponctuelle et un polariseur qui sont stratifié séquentiellement sur une face du film de fenêtre, la couche à adhérence ponctuelle étant susceptible de présenter une force adhésive selon une formule spécifique. Le stratifié de fenêtre présente une force adhésive, une résistance au décollement et des propriétés de flexion améliorées à température ambiante et sous haute température et forte humidité, et peut être appliqué efficacement à un affichage souple.
PCT/KR2017/013152 2017-02-22 2017-11-20 Stratifié de fenêtre à polariseur intégré et dispositif d'affichage d'image l'incluant WO2018155787A1 (fr)

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KR1020170023505A KR20180096996A (ko) 2017-02-22 2017-02-22 편광판 일체형 윈도우 적층체 및 이를 포함하는 화상 표시 장치
KR10-2017-0023505 2017-02-22

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JP7097959B2 (ja) 2017-10-27 2022-07-08 アプライド マテリアルズ インコーポレイテッド 可撓性カバーレンズフィルム
KR20200142594A (ko) 2018-05-10 2020-12-22 어플라이드 머티어리얼스, 인코포레이티드 플렉서블 디스플레이를 위한 교체가능한 커버 렌즈
WO2020036693A1 (fr) 2018-08-14 2020-02-20 Applied Materials, Inc. Revêtements durs multicouches déposés par voie humide et voie sèche pour écran de couverture souple
KR102564140B1 (ko) * 2019-02-19 2023-08-09 동우 화인켐 주식회사 플렉시블 윈도우 적층체 및 이를 포함하는 화상 표시 장치
WO2020263633A1 (fr) 2019-06-26 2020-12-30 Applied Materials, Inc. Empilements de lentilles de recouvrement multicouches souples pour écrans pliables

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US20140003747A1 (en) * 2011-03-11 2014-01-02 Ruhrpumpen Gmbh Method for mounting a hydrodynamic sliding bearing and hydrodynamic sliding bearing, in particular of a magnetic coupling pump
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KR20160129209A (ko) * 2015-04-29 2016-11-09 삼성디스플레이 주식회사 표시 장치 및 이를 제조하는 방법

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