WO2019143065A1 - Touch sensor and display device comprising same - Google Patents

Touch sensor and display device comprising same Download PDF

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Publication number
WO2019143065A1
WO2019143065A1 PCT/KR2019/000389 KR2019000389W WO2019143065A1 WO 2019143065 A1 WO2019143065 A1 WO 2019143065A1 KR 2019000389 W KR2019000389 W KR 2019000389W WO 2019143065 A1 WO2019143065 A1 WO 2019143065A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
touch sensor
layer
window
thickness
Prior art date
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PCT/KR2019/000389
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French (fr)
Korean (ko)
Inventor
유성우
손동진
송병훈
윤호동
Original Assignee
동우 화인켐 주식회사
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Priority claimed from KR1020180169366A external-priority patent/KR102552214B1/en
Application filed by 동우 화인켐 주식회사 filed Critical 동우 화인켐 주식회사
Priority to US16/962,584 priority Critical patent/US11119597B2/en
Priority to CN201980008896.9A priority patent/CN111630481B/en
Publication of WO2019143065A1 publication Critical patent/WO2019143065A1/en

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants

Definitions

  • the present invention relates to a touch sensor and a display device including the touch sensor.
  • the touch input method allows the user to touch and input a specific position of the display screen, thereby providing an intuitive and convenient user interface.
  • the touch input method can be combined with a display screen without a separate input device such as a keyboard or a mouse, which is particularly advantageous for a portable electronic device.
  • Korean Patent Laid-Open No. 10-2016-0085036 discloses a touch panel including a touch electrode plate including a touch-sensitive pattern, an adhesive layer formed on the touch electrode plate, and a base film formed on the adhesive layer, Wherein the tensile elastic modulus of the adhesive layer is 0.01 to 10 MPa and the thickness of the adhesive layer is 5 to 100 ⁇ and the tensile elastic modulus of the base film is 50 to 6000 MPa, By simultaneously satisfying the thickness of 20 to 300 mu m, flexibility and durability are simultaneously improved, which is suitable for application to a flexible display, and a film touch sensor which is formed on a carrier substrate and does not cause cracking or breakage when peeling off from the carrier substrate Lt; / RTI >
  • the present invention has been made based on the technical background as described above, and it is an object of the present invention to provide a touch sensor which is excellent in flexibility and durability and is thinned.
  • the touch sensor of the present invention may include a lower adhesive layer, a touch sensor layer, and an upper adhesive layer.
  • the touch sensor layer may be bonded on the lower adhesive layer and may include a touch sensitive electrode pattern.
  • the upper adhesive layer can bond on the touch sensor layer.
  • the upper adhesive layer may be thicker than the lower adhesive layer and have a low elastic modulus.
  • the lower adhesive layer may have a thickness of 2 to 20 mu m and an elastic modulus of 0.5 to 5.0 MPa.
  • the upper adhesive layer may have a thickness of 5 to 50 mu m and an elastic modulus of 0.05 to 1.00 MPa.
  • T1 / T2 may have a value of 1.1 to 5.0.
  • M2 / M1 can have a value of 1.16 to 20.0.
  • the upper adhesive layer and the lower adhesive layer may be made of OCA (Optically Clear Adhesive).
  • the touch sensor according to the present invention may not include a base film.
  • the laminate according to the present invention can include a window that is bonded to the touch sensor through the above-described touch sensor and the upper adhesive layer.
  • the window may have a hard coating film.
  • the laminate according to the present invention may include a polarizing layer including a polarizer on one side of a window.
  • the window may further include a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the frame.
  • the display device may include the above-described touch sensor, a window connected to the touch sensor through the upper adhesive layer, and a display layer bonded to the touch sensor through the lower adhesive layer.
  • the window may have a hard coating film.
  • the display device may include a polarizing layer including a polarizer on one side of a window.
  • the window may further include a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the frame.
  • the display layer may be an LCD layer or an OLED layer.
  • the adhesive layer having a thin thickness below the touch sensing electrode pattern and having a high elastic modulus serves as a substrate, a thick adhesive layer with a low elastic modulus above the touch sensor layer can disperse the stress of the optical film have. Accordingly, it is possible to provide a thin touch sensor with excellent flexibility and durability, and in particular, such a touch sensor has excellent flexing resistance under infolding conditions.
  • FIG. 1 is a cross-sectional view of a touch sensor according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of a laminated structure according to an embodiment of the present invention.
  • FIG 3 is a cross-sectional view of a display device according to an embodiment of the present invention.
  • FIG. 1 is a cross-sectional view of a touch sensor according to an embodiment of the present invention.
  • a touch sensor 10 includes a touch sensor layer 120 formed without a base film and an upper adhesive layer (not shown) formed on upper and lower portions of a touch sensor layer 120 130) and a lower adhesive layer (110).
  • the touch sensor layer 120 includes a touch sensing electrode pattern for sensing a touch input, and various electrode patterns known in the art can be used without limitation.
  • it may include an electrode pattern used in a capacitive touch sensor, and mutual-capacitance or self-capacitance may be applied.
  • a bridge electrode may be included.
  • the material for forming the electrode pattern is not particularly limited, but a material having a suitable conductivity and a transparent material can be mainly used.
  • a material having a suitable conductivity and a transparent material can be mainly used.
  • the metal may be any one of gold, silver, copper, molybdenum, aluminum, palladium, neodymium, platinum, zinc, tin, titanium and alloys thereof.
  • the metal nanowires may be silver nanowires, copper nanowires, zirconium nanowires, or gold nanowires.
  • the metal oxide is selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), florinthine oxide (ZnO).
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • IZTO indium zinc tin oxide
  • AZO aluminum zinc oxide
  • GZO gallium zinc oxide
  • florinthine oxide ZnO
  • the electrode pattern may also be formed of a carbon-based material including carbon nanotube (CNT) or graphene.
  • CNT carbon nanotube
  • the conductive polymer comprises polypyrrole, polythiophene, polyacetylene, PEDOT, and polyaniline, wherein the conductive ink is a mixture of a metal powder and a curable polymeric binder, .
  • the electrode pattern may have a laminated structure of two or more conductive layers in some cases in order to reduce electrical resistance.
  • the electrode pattern may be formed of one layer of ITO, AgNW (silver nano wire), or metal mesh.
  • the first electrode layer may be formed of a transparent metal oxide such as ITO
  • a second electrode layer may be formed on the ITO electrode layer using metal, AgNW or the like to further reduce the resistance.
  • the touch sensor layer 120 of the touch sensor 10 is formed without a base film, and an electrode pattern is formed on a thin protective film (not shown) having a thickness of several micrometers. Further, the touch sensor layer 120 may be formed by, for example, forming a protective film and an electrode pattern on a carrier substrate, and then transferring the protective film and the electrode pattern.
  • the upper adhesive layer 130 on the upper surface of the touch sensor layer 120 is a layer that serves to bond components of a display device such as an optical film to the upper portion of the touch sensor layer 120.
  • the "upper portion” means the side where the touch input of the user is performed based on the touch sensor layer 120.
  • the upper adhesive layer 130 has a thickness of 5 to 50 ⁇ m and an elastic modulus of 0.05 to 1.00 MPa (at 25 ° C.).
  • the lower adhesive layer 110 under the touch sensor layer 120 serves to support the touch electrode pattern in the structure of the touch sensor layer 120 having no base material and at the same time bonding the display layer under the touch sensor layer 120 It is the layer that plays a role.
  • “lower” means the side opposite to the side where the user's touch input is performed with respect to the touch sensor layer 120.
  • the lower adhesive layer 110 has a thickness of 2 to 20 ⁇ m and an elastic modulus of 0.5 to 5 MPa (at 25 ° C.).
  • the thickness of the lower adhesive layer 110 and the elasticity of the lower adhesive layer 110 can serve as a support in the structure of the touch sensor layer 120 having no base material and transmit the stress applied to the touch sensor layer 120 to the lower portion,
  • the sensor 10 does not crack or break when bent or bent.
  • T1 / T2 has a value between 1.1 and 5.0.
  • M2 / M1 has a value between 1.16 and 20.0.
  • the touch sensor 10 does not generate cracks or breaks when the touch sensor 10 is bent or bent, and therefore, it is very suitable for use in a flexible display device.
  • the bending resistance is excellent in an infolding condition in which the upper adhesive layer 130 of the touch sensor 10 is positioned inside and the lower adhesive layer 110 is bent outward.
  • adhesive materials known in the art can be applied without limitation as long as they satisfy the above-mentioned physical properties.
  • OCA Optically Clear Adhesive
  • acrylic copolymer, crosslinking agent and silane coupling agent are included Sensitive adhesive composition.
  • the acrylic copolymer usable in the present invention preferably contains an ionic monomer having a (meth) acrylate monomer and a vinyl group.
  • (meth) acrylate means acrylate and methacrylate.
  • Examples of the (meth) acrylate monomers include n-butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl (meth) acrylate, (Meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-butyl (Meth) acrylate, decyl (meth) acrylate, and lauryl (meth) acrylate.
  • n-butyl acrylate, 2-ethylhexyl acrylate or a mixture thereof is preferable. These may be used alone or in combination of two or more.
  • the ionic monomer having a vinyl group preferably contains 0.1 to 10 parts by weight, more preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylate monomer. If the content is less than 0.1 part by weight, the effect of improving the compatibility of the antistatic agent is insufficient, and it may be difficult to secure durability. If the content exceeds 10 parts by weight, the hydrophilicity may become too high,
  • the acrylic copolymer of the present invention may further contain a polymerizable monomer having a crosslinkable functional group in addition to the ionic monomer having the vinyl group.
  • the polymerizable monomer having a crosslinkable functional group can impart durability and cutability by reinforcing the cohesive strength or adhesive strength of the pressure-sensitive adhesive composition by chemical bonding, and a component that does not generate hydrogen ions (H +) is used.
  • Examples of the polymerizable monomer having a crosslinkable functional group include a monomer having a hydroxy group, a monomer having an amide group, and a monomer having a tertiary amine group, and these may be used alone or in combination of two or more.
  • Examples of the monomer having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl Hydroxypropyleneglycol (meth) acrylate, hydroxyalkylene glycol having 2 to 4 carbon atoms in the alkylene group (e.g., methoxyethyl (meth) acrylate, Hydroxybutyl vinyl ether, 8-hydroxyoctyl vinyl ether, 9-hydroxynonyl (meth) acrylate, 4-hydroxybutyl vinyl ether, Vinyl ether, and 10-hydroxydecyl vinyl ether, among which 4-hydroxybutyl vinyl ether is preferable.
  • 2-hydroxyethyl (meth) acrylate 2-hydroxypropyl (meth) acrylate
  • 2-hydroxybutyl (meth) acrylate 2-hydroxybutyl (meth) acrylate
  • Examples of the monomer having an amide group include (meth) acrylamide, N-isopropyl acrylamide, N-tertiary butyl acrylamide, 3-hydroxypropyl (meth) acrylamide, 4-hydroxybutyl (Meth) acrylamide, 8-hydroxyoctyl (meth) acrylamide, and 2-hydroxyethylhexyl (meth) acrylamide. Of these, (meth) acrylamide is preferable.
  • Examples of the monomer having a tertiary amine group include N, N- (dimethylamino) ethyl (meth) acrylate, N, N- (diethylamino) ethyl (meth) Methacrylate, and the like.
  • the polymerizable monomer having such a crosslinkable functional group is preferably contained in an amount of 0.05 to 10 parts by weight, more preferably 0.1 to 8 parts by weight, based on 100 parts by weight of the (meth) acrylate monomer having an alkyl group having 1-12 carbon atoms good.
  • the content is less than 0.05 part by weight, the cohesive force of the pressure-sensitive adhesive becomes small and durability may be deteriorated.
  • a high gel fraction may lower the adhesive strength and cause durability problems.
  • the acrylic copolymer of the present invention may further contain other polymerizable monomers other than the above monomers in a range not lowering the adhesive force, for example, 10 parts by weight or less based on the total amount.
  • the method for producing the copolymer is not particularly limited and can be produced by methods such as bulk polymerization, solution polymerization, emulsion polymerization or suspension polymerization, which are commonly used in the art, and solution polymerization is preferable.
  • a solvent, a polymerization initiator, a chain transfer agent for molecular weight control and the like which are usually used in polymerization can be used.
  • the acrylic copolymer preferably has a weight average molecular weight (polystyrene conversion, Mw) of 50,000 to 2,000,000, more preferably 400,000 to 2,000,000 as measured by Gel Permeation Chromatography (GPC).
  • Mw polystyrene conversion
  • GPC Gel Permeation Chromatography
  • the crosslinking agent usable in the present invention is a component which enables the pressure-sensitive adhesive layer to satisfy the above-described elastic modulus with a proper degree of crosslinking, and examples thereof include isocyanate-based, epoxy-based, melamine-based, peroxide based, metal chelating based, oxazoline based cross- And it is preferable to use an isocyanate-based or metal chelate-based system in view of achieving proper viscoelasticity by forming a crosslinking with the acrylic copolymer.
  • isocyanate-based isocyanate examples include isocyanate-based compounds such as tolylene diisocyanate, xylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethyl xylene diisocyanate, Diisocyanate compounds such as isocyanate; An adduct obtained by reacting 3 moles of a diisocyanate compound with 1 mole of a polyhydric alcohol compound such as trimethylolpropane, an isocyanurate compound in which 3 moles of a diisocyanate compound is self-condensed, a diisocyanate obtained from 2 moles of 3 moles of a diisocyanate compound And multifunctional isocyanate compounds containing three functional groups such as burette, triphenylmethane triisocyanate and methylene bistrii
  • the epoxy system may be an ethylene glycol diglycidyl ether, a diethylene glycol diglycidyl ether, a polyethylene glycol diglycidyl ether, a propylene glycol diglycidyl ether, a tripropylene glycol diglycidyl ether, a polypropylene glycol di Hexanediol diglycidyl ether, polytetramethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, diethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, Glycerol polyglycidyl ether, polyglycerol polyglycidyl ether, resorcinol diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, trimethylol propane triglycidyl ether, pentaerythri
  • the metal chelating agent examples include a metal chelating agent such as aluminum (Al), iron (Fe), zinc (Zn), tin (Sn), titanium, antimony (Sb), magnesium (Mg), and vanadium And compounds in which ethyl acetate or the like is coordinated.
  • a metal chelating agent such as aluminum (Al), iron (Fe), zinc (Zn), tin (Sn), titanium, antimony (Sb), magnesium (Mg), and vanadium And compounds in which ethyl acetate or the like is coordinated.
  • Examples of the melamine series include hexamethylol melamine, hexamethoxymethyl melamine, and hexabutoxymethyl melamine.
  • FIG. 2 is a cross-sectional view of a laminated structure according to an embodiment of the present invention.
  • a laminated structure according to an embodiment of the present invention includes a touch sensor 10 according to an embodiment of the present invention and a window 20 on the touch sensor 10 .
  • the touch sensor 10 and the window 20 may be bonded to each other through the upper adhesive layer 130 of the touch sensor 10 (FIG. 1).
  • the window 20 is provided with a hard coating film and may include, on one side of the window 20, a polarizing layer (not shown) including a polarizer. If necessary, the window 20 may be provided with a polarizing layer on which a protective film is placed with a point-adhesive layer interposed therebetween.
  • a colored light shielding pattern printed on the window 20 or the polarizing layer on at least one side of the frame may be provided, and the light shielding pattern may be a single layer or a multi-layered form.
  • the polarizing layer can be, for example, a continuous polarizing plate which can be continuously extended over the non-display region or the bezel portion and includes a protective film attached to at least one side of the polyvinyl alcohol polarizer and the polyvinyl alcohol polarizer have.
  • Another example of the polarizing layer includes a liquid crystal coating layer containing a polymerizable liquid crystal compound and a dichroic dye, and may further include an alignment layer for imparting orientation to the liquid crystal coating layer.
  • FIG 3 is a cross-sectional view of a display device according to an embodiment of the present invention.
  • a display device includes a touch sensor 10 according to an embodiment of the present invention, a window 20 on the touch sensor 10, And a display layer (30) under the display layer (10).
  • the touch sensor 10 when the window 20 includes a polarizing layer, since the touch sensor 10 is located on the lower side of the polarizing layer on the viewing side, The pattern of the light source is not well visible. Particularly, since the touch sensor 10 according to the embodiment of the present invention is a touch sensor 10 having no base material, the touch sensor 10 can be transferred to the window 20, Layer, the touch sensor 10 can be transferred to the polarizing layer.
  • the display layer 30 may be any of those applicable to a flexible display device, and may be, for example, an OLED layer or an LCD layer, but is not limited thereto.
  • the durability against bending was evaluated by manufacturing a touch sensor having upper and lower adhesive layers of various thicknesses and elastic moduli.
  • the durability evaluation was performed by folding the middle of the manufactured touch sensor.
  • the radius at the time of folding was set to 1R (radius 1 mm), and the number of times of folding was set to 10,000 times.
  • the touch function was evaluated by comparing the output value from the driver IC after FPCB bonding, before and after the durability evaluation, and it was judged OK when the ITO opening or short circuit phenomenon of the touch sensor was observed.
  • the trace cracks and the polarizing layer cracks were evaluated by folding, and then the traces and the polarizing layer were visually observed.
  • Example 1 25 0.05 5 0.90 OK OK OK 5.00 18.00
  • Example 2 20 0.10 5 0.90 OK OK OK 4.00 9.00
  • Example 3 15 0.40 5 0.50 OK OK OK 3.00 1.25
  • Example 4 50 0.05 20 0.90 OK OK OK OK 2.50 18.00
  • Example 5 5 0.50 2 5.00 OK OK OK OK 2.50 10.00
  • Example 6 40 0.10 10 2.00 OK OK OK 4.00 20.00
  • Example 7 10 0.50 9 0.60 OK OK OK 1.10 1.20
  • Comparative Example 1 5 0.90 5 0.90 OK OK OK NG 1.00 1.00
  • Comparative Example 2 10 0.20 5 5.00 NG NG 2.00 25.00 Comparative Example 3 25 0.03 25 0.05 NG NG OK 1.00 1.60
  • Examples 1 to 9 which passed all of the evaluation criteria (touch function, trace crack, and polarization layer crack) It can be confirmed that it is distinguished from Comparative Examples 1 to 8. That is, when the thickness of the upper adhesive layer is T1 and the thickness of the lower adhesive layer is T2, in Examples 1 to 9, T1 / T2 has a value between 1.1 and 5.0. Further, when the elastic modulus of the upper adhesive layer is M1 and the elastic modulus of the lower adhesive layer is M2, in Examples 1 to 9, M2 / M1 has a value between 1.16 and 20.0. Incidentally, Comparative Examples 1 to 8 are different from the thickness ratios and the modulus ratios of Examples 1 to 9.
  • the upper adhesive layer is made thicker than the lower adhesive layer, It is necessary to configure it to have a lower elastic modulus.
  • the thickness T1 of the upper adhesive layer is 5 to 50 mu m
  • the modulus of elasticity M1 is 0.05 to 1.00 MPa
  • the thickness T2 of the lower adhesive layer is 2 to 20 mu m
  • the elastic modulus M2 is 0.5 to 5.0 MPa.
  • the thickness ratio of the upper adhesive layer to the lower adhesive layer, that is, T1 / T2 is 1.1 to 5.0
  • the modulus of elasticity of the upper adhesive layer and the lower adhesive layer, M1 may have a value between 1.16 and 20.0.

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  • General Engineering & Computer Science (AREA)
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  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
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Abstract

Provided is a touch sensor wherein a thin adhesive layer placed under a touch sensing electrode pattern and having a high elastic modulus serves as a substrate, and a thick adhesive layer placed on a touch sensor layer and having a low elastic modulus serves to dissipate the stress in an optical film, whereby the touch sensor can be implemented as a thin film type touch sensor while having excellent pliability and flexure durability.

Description

터치 센서 및 이를 포함하는 표시 장치Touch sensor and display device including the same
본 발명은 터치센서 및 이를 포함하는 표시 장치에 관한 것이다.The present invention relates to a touch sensor and a display device including the touch sensor.
최근의 표시 장치에는 사용자가 손가락을 이용하여 직접 화면을 터치하여 입력하는 터치 입력방식이 많이 적용되고 있다. 터치 입력방식은 사용자가 표시 화면의 특정 위치를 터치하여 입력할 수 있어 직관적이고 편리한 사용자 인터페이스를 제공할 수 있다. Recently, a touch input method in which a user directly touches a screen using a finger and inputs the touch input method is widely used. The touch input method allows the user to touch and input a specific position of the display screen, thereby providing an intuitive and convenient user interface.
또한, 터치 입력방식은 키보드나 마우스와 같은 별도의 입력장치 없이 표시 화면에 결합될 수 있어 휴대용 전자기기에 특히 유리하다. In addition, the touch input method can be combined with a display screen without a separate input device such as a keyboard or a mouse, which is particularly advantageous for a portable electronic device.
터치 센서를 휴대용 전자기기에 사용하기 위해서는 경량화 및 박막화가 요구되며, 사용의 편리성을 극대화하기 위해 유연성 표시 장치가 개발되면서 터치 센서 또한 유연성의 확보가 요구되고 있다.In order to use the touch sensor in a portable electronic device, weight reduction and thinning are required. In order to maximize ease of use, a flexible display device has been developed and a touch sensor has also been required to have flexibility.
예를 들면, 대한민국 공개특허 제10-2016-0085036호에서는 터치 감지 패턴을 포함하는 터치 전극 플레이트, 상기 터치 전극 플레이트 상부에 형성되는 점착층, 및 상기 점착층 상부에 형성되는 기재 필름을 포함하며, 상기 터치 전극 플레이트의 압축 탄성률은 100 내지 6000MPa, 두께는 1 내지 40㎛이고, 상기 점착층의 인장 탄성률은 0.01 내지 10MPa, 두께는 5 내지 100㎛이고, 상기 기재 필름의 인장 탄성률은 50 내지 6000MPa, 두께는 20 내지 300㎛를 동시에 만족함으로써, 유연성과 내구성이 동시에 향상되어 플렉서블 디스플레이에 적용하기 적합하며, 캐리어 기판 상에 형성되어 캐리어 기판에서의 박리시 크랙이나 파단 등이 발생하지 않는 필름 터치 센서를 개시하고 있다.For example, Korean Patent Laid-Open No. 10-2016-0085036 discloses a touch panel including a touch electrode plate including a touch-sensitive pattern, an adhesive layer formed on the touch electrode plate, and a base film formed on the adhesive layer, Wherein the tensile elastic modulus of the adhesive layer is 0.01 to 10 MPa and the thickness of the adhesive layer is 5 to 100 탆 and the tensile elastic modulus of the base film is 50 to 6000 MPa, By simultaneously satisfying the thickness of 20 to 300 mu m, flexibility and durability are simultaneously improved, which is suitable for application to a flexible display, and a film touch sensor which is formed on a carrier substrate and does not cause cracking or breakage when peeling off from the carrier substrate Lt; / RTI >
본 발명은 상기한 바와 같은 기술적 배경을 바탕으로 이루어진 것으로서, 유연성과 내구성이 뛰어나며 박막화된 터치 센서를 제공하는 것을 그 과제로 한다.The present invention has been made based on the technical background as described above, and it is an object of the present invention to provide a touch sensor which is excellent in flexibility and durability and is thinned.
이러한 목적을 달성하기 위한 본 발명의 터치 센서는 하부 점착층, 터치 센서층, 상부 점착층을 포함하여 구성할 수 있다.In order to achieve the above object, the touch sensor of the present invention may include a lower adhesive layer, a touch sensor layer, and an upper adhesive layer.
터치 센서층은 하부 점착층 상에 결합하고 터치 감지 전극 패턴을 포함할 수 있다.The touch sensor layer may be bonded on the lower adhesive layer and may include a touch sensitive electrode pattern.
상부 점착층은 터치 센서층 상에 결합할 수 있다. 상부 점착층은 하부 점착층보다 두껍고 탄성률이 낮을 수 있다.The upper adhesive layer can bond on the touch sensor layer. The upper adhesive layer may be thicker than the lower adhesive layer and have a low elastic modulus.
본 발명에 따른 터치 센서에서, 하부 점착층은 2 내지 20㎛의 두께와 0.5 내지 5.0MPa의 탄성률을 가질 수 있다. In the touch sensor according to the present invention, the lower adhesive layer may have a thickness of 2 to 20 mu m and an elastic modulus of 0.5 to 5.0 MPa.
상부 점착층은 5 내지 50㎛의 두께와 0.05 내지 1.00MPa의 탄성률을 가질 수 있다.The upper adhesive layer may have a thickness of 5 to 50 mu m and an elastic modulus of 0.05 to 1.00 MPa.
상부 점착층의 두께를 T1, 하부 점착층의 두께를 T2라고 할 때, T1/T2는 1.1 내지 5.0의 값을 가질 수 있다.When the thickness of the upper adhesive layer is T1 and the thickness of the lower adhesive layer is T2, T1 / T2 may have a value of 1.1 to 5.0.
상부 점착층의 탄성률을 M1, 하부 점착층의 탄성률을 M2라고 할 때, M2/M1는 1.16 내지 20.0의 값을 가질 수 있다.When the elastic modulus of the upper adhesive layer is M1 and the elastic modulus of the lower adhesive layer is M2, M2 / M1 can have a value of 1.16 to 20.0.
본 발명에 따른 터치 센서에서, 상부 점착층과 하부 점착층은 OCA(Optically Clear Adhesive)로 이루어질 수 있다.In the touch sensor according to the present invention, the upper adhesive layer and the lower adhesive layer may be made of OCA (Optically Clear Adhesive).
본 발명에 따른 터치 센서는 기재필름을 포함하지 않을 수 있다.The touch sensor according to the present invention may not include a base film.
본 발명에 따른 적층체는 위에서 설명한 터치 센서와 상부 점착층을 통해 터치 센서와 접합되는 윈도우를 포함하여 구성할 수 있다.The laminate according to the present invention can include a window that is bonded to the touch sensor through the above-described touch sensor and the upper adhesive layer.
본 발명에 따른 적층체에서, 윈도우는 하드코팅 필름을 구비할 수 있다.In the laminate according to the present invention, the window may have a hard coating film.
본 발명에 따른 적층체는 윈도우의 일면에 편광자를 포함하는 편광층을 포함할 수 있다.The laminate according to the present invention may include a polarizing layer including a polarizer on one side of a window.
본 발명에 따른 적층체에서, 윈도우는 편광층의 적어도 일면에 테두리를 둘러싸고 인쇄되는 유색의 차광 패턴을 더 포함할 수 있다.In the laminate according to the present invention, the window may further include a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the frame.
본 발명에 따른 표시 장치는, 위에서 설명한 터치 센서, 상부 점착층을 통해 터치 센서와 접합되는 윈도우, 그리고 하부 점착층을 통해 터치 센서와 접합되는 표시층을 포함하여 구성할 수 있다.The display device according to the present invention may include the above-described touch sensor, a window connected to the touch sensor through the upper adhesive layer, and a display layer bonded to the touch sensor through the lower adhesive layer.
본 발명에 따른 표시 장치에서, 윈도우는 하드코팅 필름을 구비할 수 있다.In the display device according to the present invention, the window may have a hard coating film.
본 발명에 따른 표시 장치는 윈도우의 일면에 편광자를 포함하는 편광층을 포함할 수 있다.The display device according to the present invention may include a polarizing layer including a polarizer on one side of a window.
본 발명에 따른 표시 장치에서, 윈도우는 편광층의 적어도 일면에 테두리를 둘러싸고 인쇄되는 유색의 차광 패턴을 더 포함할 수 있다.In the display device according to the present invention, the window may further include a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the frame.
본 발명에 따른 표시 장치에서, 표시층은 LCD층 또는 OLED층일 수 있다.In the display device according to the present invention, the display layer may be an LCD layer or an OLED layer.
본 발명에 따른 터치 센서에 의하면, 터치 감지 전극 패턴 하부의 두께가 얇고 탄성률이 높은 점착층이 기재의 역할을 하고, 터치 센서층 상부의 두껍고 탄성률이 낮은 점착층이 광학 필름의 응력을 분산시킬 수 있다. 이에 따라, 유연성과 굴곡에 대한 내구성이 뛰어나면서도 박막화된 터치 센서를 제공할 수 있으며, 특히 이러한 터치 센서는 인폴딩(infolding) 조건에서 내굴곡성이 뛰어나다. According to the touch sensor of the present invention, the adhesive layer having a thin thickness below the touch sensing electrode pattern and having a high elastic modulus serves as a substrate, a thick adhesive layer with a low elastic modulus above the touch sensor layer can disperse the stress of the optical film have. Accordingly, it is possible to provide a thin touch sensor with excellent flexibility and durability, and in particular, such a touch sensor has excellent flexing resistance under infolding conditions.
도 1은 본 발명의 일 실시예에 따른 터치 센서의 단면도이다.1 is a cross-sectional view of a touch sensor according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 적층 구조체의 단면도이다.2 is a cross-sectional view of a laminated structure according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 표시 장치의 단면도이다.3 is a cross-sectional view of a display device according to an embodiment of the present invention.
이하, 도면을 참조하여 본 발명에 따른 터치 센서 및 이를 포함하는 표시 장치에 관하여 상세히 설명한다. 다만 본 명세서에 첨부된 도면들은 본 발명을 설명하기 위한 예시일 뿐, 본 발명이 도면에 의해 한정되는 것은 아니다. 또한, 설명 상의 편의를 위해 일부 구성요소들은 도면 상에서 과장되게 표현되거나, 축소 또는 생략되어 있을 수 있다.Hereinafter, a touch sensor and a display device including the touch sensor according to the present invention will be described in detail with reference to the drawings. It is to be understood, however, that the drawings are exemplary only for illustrating the present invention, and the present invention is not limited thereto. Also, for ease of explanation, some of the elements may be exaggerated in the drawings, or may be omitted or omitted.
도 1은 본 발명의 일 실시예에 따른 터치 센서의 단면도이다.1 is a cross-sectional view of a touch sensor according to an embodiment of the present invention.
도 1을 참조하면, 본 발명의 일 실시예에 따른 터치 센서(10)는 기재 필름이 없이 형성되는 터치 센서층(120)과 터치 센서층(120)의 상부 및 하부에 각각 형성된 상부 점착층(130) 및 하부 점착층(110)을 포함하여 이루어진다. Referring to FIG. 1, a touch sensor 10 according to an embodiment of the present invention includes a touch sensor layer 120 formed without a base film and an upper adhesive layer (not shown) formed on upper and lower portions of a touch sensor layer 120 130) and a lower adhesive layer (110).
터치 센서층(120)은 터치 입력을 감지하기 위한 터치 감지 전극 패턴을 포함하며, 이 분야에 공지된 다양한 전극 패턴을 제한 없이 사용할 수 있다. 예를 들면, 정전용량 방식 터치 센서에 사용되는 전극 패턴을 포함할 수 있으며, 상호 정전용량(mutual-capacitance) 방식 또는 자기 정전용량(self-capacitance) 방식이 적용될 수 있다. The touch sensor layer 120 includes a touch sensing electrode pattern for sensing a touch input, and various electrode patterns known in the art can be used without limitation. For example, it may include an electrode pattern used in a capacitive touch sensor, and mutual-capacitance or self-capacitance may be applied.
상호 정전용량 방식일 경우, 가로축과 세로축의 격자 패턴을 가질 수 있다. 가로축과 세로축의 전극의 교차점에는 브리지 전극을 포함할 수 있다.In the case of mutual capacitance type, it may have a grid pattern of a horizontal axis and a vertical axis. At the intersection of the electrodes on the horizontal axis and the vertical axis, a bridge electrode may be included.
자기 정전용량 방식일 경우, 각 지점에서 한 개의 전극을 사용해 정전용량 변화를 읽어내는 방식의 전극 패턴을 가질 수 있다.In the case of the self-capacitance type, it is possible to have an electrode pattern in which capacitance change is read using one electrode at each point.
전극 패턴을 형성하기 위한 재료는 특별히 한정되지 않으나, 적정한 전도성을 가지며 투명한 재료가 주로 사용될 수 있으며, 예를 들면, 금속, 금속 나노와이어, 금속 산화물, 탄소 나노튜브, 그래핀, 전도성 고분자 및 도전성 잉크에서 선택된 하나 이상의 물질로 형성될 수 있다.The material for forming the electrode pattern is not particularly limited, but a material having a suitable conductivity and a transparent material can be mainly used. For example, metal, metal nanowire, metal oxide, carbon nanotube, graphene, conductive polymer and conductive ink , ≪ / RTI >
여기서, 금속은 금, 은, 구리, 몰리브덴, 알루미늄, 팔라듐, 네오듐, 백금, 아연, 주석, 티타늄 또는 이들의 합금 중 어느 하나가 될 수 있다.Here, the metal may be any one of gold, silver, copper, molybdenum, aluminum, palladium, neodymium, platinum, zinc, tin, titanium and alloys thereof.
그리고, 금속 나노와이어는 은 나노와이어, 구리 나노와이어, 지르코늄 나노와이어, 금 나노와이어 중 어느 하나가 될 수 있다.The metal nanowires may be silver nanowires, copper nanowires, zirconium nanowires, or gold nanowires.
그리고, 금속 산화물은 인듐틴옥사이드(ITO), 인듐징크옥사이드(IZO), 인듐징크틴옥사이드(IZTO), 알루미늄징크옥사이드(AZO), 갈륨징크옥사이드(GZO), 플로린틴옥사이드(FTO), 징크옥사이드(ZnO) 중 어느 하나가 될 수 있다.The metal oxide is selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), florinthine oxide (ZnO).
또한 전극 패턴은 탄소 나노튜브(CNT) 또는 그래핀(graphene)을 포함하는 탄소(carbon)계 물질로 형성할 수도 있다.The electrode pattern may also be formed of a carbon-based material including carbon nanotube (CNT) or graphene.
상기 전도성 고분자는 폴리피롤(polypyrrole), 폴리티오펜(polythiophene), 폴리아세틸렌(polyacetylene), 피닷(PEDOT) 및 폴리아닐린(polyaniline)을 포함하며, 상기 도전성 잉크는 금속파우더와 경화성 고분자 바인더가 혼합된 잉크를 포함한다.Wherein the conductive polymer comprises polypyrrole, polythiophene, polyacetylene, PEDOT, and polyaniline, wherein the conductive ink is a mixture of a metal powder and a curable polymeric binder, .
또한, 전극 패턴은 전기 저항을 저감시키기 위해 경우에 따라서는 2 이상의 전도층의 적층 구조로 이루어질 수 있다. In addition, the electrode pattern may have a laminated structure of two or more conductive layers in some cases in order to reduce electrical resistance.
전극 패턴은 일 실시예로 ITO, AgNW(은나노와이어), 또는 메탈 메쉬로 1층으로 형성할 수 있으며, 2 이상의 층을 형성하는 경우에는 제 1 전극층을 ITO와 같은 투명 금속산화물로 형성하고, 전기적 저항을 더 낮추기 위하여 ITO 전극층 상부에 금속이나 AgNW 등을 이용하여 제 2 전극층을 형성할 수 있다.In one embodiment, the electrode pattern may be formed of one layer of ITO, AgNW (silver nano wire), or metal mesh. When two or more layers are formed, the first electrode layer may be formed of a transparent metal oxide such as ITO, A second electrode layer may be formed on the ITO electrode layer using metal, AgNW or the like to further reduce the resistance.
본 발명의 일 실시예에 따른 터치 센서(10)의 터치 센서층(120)은 기재 필름이 없이 형성되는 구조로서, 수 ㎛ 두께의 얇은 보호막(도시하지 않음) 상에 전극 패턴이 형성된다. 또한, 이러한 터치 센서층(120)은, 예를 들면, 캐리어 기판 상에 보호막 및 전극 패턴을 형성한 후 이를 전사하는 방식으로 형성할 수 있다. The touch sensor layer 120 of the touch sensor 10 according to an embodiment of the present invention is formed without a base film, and an electrode pattern is formed on a thin protective film (not shown) having a thickness of several micrometers. Further, the touch sensor layer 120 may be formed by, for example, forming a protective film and an electrode pattern on a carrier substrate, and then transferring the protective film and the electrode pattern.
터치 센서층(120) 상부의 상부 점착층(130)은 터치 센서층(120) 상부에 광학 필름과 같은 표시 장치의 구성요소를 접합하는 역할을 하는 층이다. 여기에서, "상부"란 터치 센서층(120)을 기준으로 사용자의 터치 입력이 이루어지는 측을 의미한다. 본 발명의 일 실시예에 따르면, 상부 점착층(130)은 5 내지 50㎛의 두께 및 0.05 내지 1.00MPa의 탄성률을 가진다(25℃ 기준). 이러한 조건을 만족하는 경우, 터치 센서층(120) 상부에 광학 필름이 부착될 때, 광학 필름의 응력을 분산시켜 터치 센서층에 응력이 전달되는 것을 방지하여 터치 센서(10)를 휘거나 구부릴 때 크랙이나 파단을 발생시키지 않는다. The upper adhesive layer 130 on the upper surface of the touch sensor layer 120 is a layer that serves to bond components of a display device such as an optical film to the upper portion of the touch sensor layer 120. Here, the "upper portion " means the side where the touch input of the user is performed based on the touch sensor layer 120. According to one embodiment of the present invention, the upper adhesive layer 130 has a thickness of 5 to 50 μm and an elastic modulus of 0.05 to 1.00 MPa (at 25 ° C.). When the optical film is adhered to the upper part of the touch sensor layer 120, the stress of the optical film is dispersed to prevent the stress from being transmitted to the touch sensor layer and the touch sensor 10 is bent or bent It does not cause cracks or fractures.
터치 센서층(120) 하부의 하부 점착층(110)은 기재가 없는 터치 센서층(120)의 구조에서 터치 전극 패턴을 지지하는 역할을 하며 동시에 터치 센서층(120) 하부에 표시층을 접합하는 역할을 하는 층이다. 여기에서, "하부"란 터치 센서층(120)을 기준으로 사용자의 터치 입력이 이루어지는 측과 반대측을 의미한다. 본 발명의 일 실시예에 따르면, 하부 점착층(110)은 2 내지 20㎛의 두께 및 0.5 내지 5MPa의 탄성률을 가진다(25℃ 기준). 이와 같이 하부 점착층(110)의 두께가 얇고 탄성률이 높으면 기재가 없는 터치 센서층(120)의 구조에서 지지 역할을 수행할 수 있으며, 터치 센서층(120)에 걸리는 응력을 하부로 전달하여 터치 센서(10)를 휘거나 구부릴 때 크랙이나 파단을 발생시키지 않는다. The lower adhesive layer 110 under the touch sensor layer 120 serves to support the touch electrode pattern in the structure of the touch sensor layer 120 having no base material and at the same time bonding the display layer under the touch sensor layer 120 It is the layer that plays a role. Here, "lower" means the side opposite to the side where the user's touch input is performed with respect to the touch sensor layer 120. According to one embodiment of the present invention, the lower adhesive layer 110 has a thickness of 2 to 20 μm and an elastic modulus of 0.5 to 5 MPa (at 25 ° C.). The thickness of the lower adhesive layer 110 and the elasticity of the lower adhesive layer 110 can serve as a support in the structure of the touch sensor layer 120 having no base material and transmit the stress applied to the touch sensor layer 120 to the lower portion, The sensor 10 does not crack or break when bent or bent.
특히, 상부 점착층(130)의 두께를 T1, 하부 점착층(110)의 두께를 T2라고 할 때, T1/T2는 1.1 내지 5.0 사이의 값을 갖는 것이 바람직하다. 또한, 상부 점착층(130)과 하부 점착층(110)의 탄성률을 각각 M1 및 M2라고 할 때, M2/M1는 1.16 내지 20.0 사이의 값을 갖는 것이 바람직하다.In particular, when the thickness of the upper adhesive layer 130 is T1 and the thickness of the lower adhesive layer 110 is T2, it is preferable that T1 / T2 has a value between 1.1 and 5.0. Further, when the elastic modulus of the upper adhesive layer 130 and the lower adhesive layer 110 are M1 and M2, it is preferable that M2 / M1 has a value between 1.16 and 20.0.
이러한 조건을 만족하는 경우, 터치 센서(10)를 휘거나 구부릴 때 크랙이나 파단을 발생시키지 않으므로 유연성 표시 장치에 사용하기에 매우 적합하다. 특히, 터치 센서(10)의 상부 점착층(130)이 내측에 위치하고 하부 점착층(110)이 외측이 되도록 굴곡되는 인폴딩(infolding) 조건에서 내굴곡성이 우수하다. When these conditions are satisfied, the touch sensor 10 does not generate cracks or breaks when the touch sensor 10 is bent or bent, and therefore, it is very suitable for use in a flexible display device. Particularly, the bending resistance is excellent in an infolding condition in which the upper adhesive layer 130 of the touch sensor 10 is positioned inside and the lower adhesive layer 110 is bent outward.
상부 및 하부 점착층에 대해서는 상술한 물성을 만족하는 것이라면, 당 분야에서 알려진 점착 소재가 제한 없이 적용될 수 있으며, 예를 들면, OCA(Optically Clear Adhesive)로서 아크릴계 공중합체, 가교제 및 실란 커플링제를 포함하는 점착제 조성물로 형성될 수 있다.As for the upper and lower adhesive layers, adhesive materials known in the art can be applied without limitation as long as they satisfy the above-mentioned physical properties. For example, as OCA (Optically Clear Adhesive), acrylic copolymer, crosslinking agent and silane coupling agent are included Sensitive adhesive composition.
본 발명에서 사용 가능한 아크릴계 공중합체는 (메타)아크릴레이트 단량체 및 비닐기를 갖는 이온성 단량체를 함유하는 것이 바람직하다. 본 발명에 있어서, (메타)아크릴레이트는 아크릴레이트 및 메타크릴레이트를 의미한다.The acrylic copolymer usable in the present invention preferably contains an ionic monomer having a (meth) acrylate monomer and a vinyl group. In the present invention, (meth) acrylate means acrylate and methacrylate.
상기 (메타)아크릴레이트 단량체로는 n-부틸(메타)아크릴레이트, 2-부틸(메타)아크릴레이트, t-부틸(메타)아크릴레이트, 2-에틸헥실(메타)아크릴레이트, 에틸(메타)아크릴레이트, 메틸(메타)아크릴레이트, n-프로필(메타)아크릴레이트, 이소프로필(메타)아크릴레이트, 펜틸(메타)아크릴레이트, n-옥틸(메타)아크릴레이트, 이소옥틸(메타)아크릴레이트, 노닐(메타)아크릴레이트, 데실(메타)아크릴레이트, 라우릴(메타)아크릴레이트 등을 들 수 있으며, 이들 중에서 n-부틸아크릴레이트, 2-에틸헥실아크릴레이트 또는 이들의 혼합물이 바람직하다. 이들은 단독 또는 2종 이상 혼합하여 사용할 수 있다.Examples of the (meth) acrylate monomers include n-butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl (meth) acrylate, (Meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-butyl (Meth) acrylate, decyl (meth) acrylate, and lauryl (meth) acrylate. Of these, n-butyl acrylate, 2-ethylhexyl acrylate or a mixture thereof is preferable. These may be used alone or in combination of two or more.
상기 비닐기를 갖는 이온성 단량체는 (메타)아크릴레이트 단량체 100중량부에 대하여 0.1 내지 10중량부를 함유하는 것이 바람직하고, 더 바람직하기로는 0.5 내지 5중량부인 것이 좋다. 함량이 0.1중량부 미만이면 대전방지제의 상용성 향상 효과가 불충분하여 내구성 확보가 곤란할 수 있으며 10중량부를 초과하는 경우에는 친수성이 지나치게 높아져서 내습열성 확보가 곤란할 수 있다.The ionic monomer having a vinyl group preferably contains 0.1 to 10 parts by weight, more preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylate monomer. If the content is less than 0.1 part by weight, the effect of improving the compatibility of the antistatic agent is insufficient, and it may be difficult to secure durability. If the content exceeds 10 parts by weight, the hydrophilicity may become too high,
본 발명의 아크릴계 공중합체는 상기 비닐기를 갖는 이온성 단량체 이외에 가교 가능한 관능기를 갖는 중합성 단량체를 추가로 함유할 수 있다. 상기 가교 가능한 관능기를 갖는 중합성 단량체는 화학 결합에 의해 점착제 조성물의 응집력 또는 점착 강도를 보강하여 내구성과 절단성을 부여할 수 있는 것으로 수소이온(H+)을 발생시키지 않는 성분을 사용한다.The acrylic copolymer of the present invention may further contain a polymerizable monomer having a crosslinkable functional group in addition to the ionic monomer having the vinyl group. The polymerizable monomer having a crosslinkable functional group can impart durability and cutability by reinforcing the cohesive strength or adhesive strength of the pressure-sensitive adhesive composition by chemical bonding, and a component that does not generate hydrogen ions (H +) is used.
상기 가교 가능한 관능기를 갖는 중합성 단량체는 예컨대 히드록시기를 갖는 단량체, 아미드기를 갖는 단량체, 3차 아민기를 갖는 단량체 등을 들 수 있으며, 이들은 단독 또는 2종 이상 혼합하여 사용할 수 있다.Examples of the polymerizable monomer having a crosslinkable functional group include a monomer having a hydroxy group, a monomer having an amide group, and a monomer having a tertiary amine group, and these may be used alone or in combination of two or more.
히드록시기를 갖는 단량체로는 2-히드록시에틸(메타)아크릴레이트, 2-히드록시프로필(메타)아크릴레이트, 2-히드록시부틸(메타)아크릴레이트, 4-히드록시부틸(메타)아크릴레이트, 6-히드록시헥실(메타)아크릴레이트, 2-히드록시에틸렌글리콜(메타)아크릴레이트, 2-히드록시프로필렌글리콜(메타)아크릴레이트, 알킬렌기의 탄소수가 2-4인 히드록시알킬렌글리콜(메타)아크릴레이트, 4-히드록시부틸비닐에테르, 5-히드록시펜틸비닐에테르, 6-히드록시헥실비닐에테르, 7-히드록시헵틸비닐에테르, 8-히드록시옥틸비닐에테르, 9-히드록시노닐비닐에테르, 및 10-히드록시데실비닐에테르 등을 들 수 있으며, 이들 중에서 4-히드록시부틸비닐에테르가 바람직하다. Examples of the monomer having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl Hydroxypropyleneglycol (meth) acrylate, hydroxyalkylene glycol having 2 to 4 carbon atoms in the alkylene group (e.g., methoxyethyl (meth) acrylate, Hydroxybutyl vinyl ether, 8-hydroxyoctyl vinyl ether, 9-hydroxynonyl (meth) acrylate, 4-hydroxybutyl vinyl ether, Vinyl ether, and 10-hydroxydecyl vinyl ether, among which 4-hydroxybutyl vinyl ether is preferable.
아미드기를 갖는 단량체로는 (메타)아크릴아미드, N-이소프로필아크릴아미드, N-3차부틸아크릴아미드, 3-히드록시프로필(메타)아크릴아미드, 4-히드록시부틸(메타)아크릴아미드, 6-히드록시헥실(메타)아크릴아미드, 8-히드록시옥틸(메타)아크릴아미드, 및 2-히드록시에틸헥실(메타)아크릴아미드 등을 들 수 있으며, 이들 중에서 (메타)아크릴아미드가 바람직하다. Examples of the monomer having an amide group include (meth) acrylamide, N-isopropyl acrylamide, N-tertiary butyl acrylamide, 3-hydroxypropyl (meth) acrylamide, 4-hydroxybutyl (Meth) acrylamide, 8-hydroxyoctyl (meth) acrylamide, and 2-hydroxyethylhexyl (meth) acrylamide. Of these, (meth) acrylamide is preferable.
3차 아민기를 갖는 단량체로는 N,N-(디메틸아미노)에틸(메타)아크릴레이트, N,N-(디에틸아미노)에틸(메타)아크릴레이트, 및 N,N-(디메틸아미노)프로필(메타)아크릴레이트 등을 들 수 있다. Examples of the monomer having a tertiary amine group include N, N- (dimethylamino) ethyl (meth) acrylate, N, N- (diethylamino) ethyl (meth) Methacrylate, and the like.
이러한 가교 가능한 관능기를 갖는 중합성 단량체는 탄소수 1-12의 알킬기를 갖는 (메타)아크릴레이트 단량체 100중량부에 대하여 0.05 내지 10중량부로 포함되는 것이 바람직하고, 더 바람직하게는 0.1 내지 8중량부인 것이 좋다. 함량이 0.05중량부 미만인 경우 점착제의 응집력이 작아지게 되어 내구성이 저하될 수 있으며, 10중량부 초과인 경우 높은 겔분율에 의해 점착력이 떨어지고 내구성에 문제를 야기할 수 있다.The polymerizable monomer having such a crosslinkable functional group is preferably contained in an amount of 0.05 to 10 parts by weight, more preferably 0.1 to 8 parts by weight, based on 100 parts by weight of the (meth) acrylate monomer having an alkyl group having 1-12 carbon atoms good. When the content is less than 0.05 part by weight, the cohesive force of the pressure-sensitive adhesive becomes small and durability may be deteriorated. When the content is more than 10 parts by weight, a high gel fraction may lower the adhesive strength and cause durability problems.
또한, 본 발명의 아크릴계 공중합체는 상기 단량체들 이외에 다른 중합성 단량체를 점착력을 저하시키지 않는 범위, 예컨대 총량에 대하여 10중량부 이하로 더 함유할 수 있다. The acrylic copolymer of the present invention may further contain other polymerizable monomers other than the above monomers in a range not lowering the adhesive force, for example, 10 parts by weight or less based on the total amount.
공중합체의 제조방법은 특별히 한정되지 않으며, 당 분야에서 통상적으로 사용되는 괴상중합, 용액중합, 유화중합 또는 현탁중합 등의 방법을 이용하여 제조할 수 있으며, 용액중합이 바람직하다. 또한, 중합 시 통상 사용되는 용매, 중합개시제, 분자량 제어를 위한 연쇄이동제 등을 사용할 수 있다. The method for producing the copolymer is not particularly limited and can be produced by methods such as bulk polymerization, solution polymerization, emulsion polymerization or suspension polymerization, which are commonly used in the art, and solution polymerization is preferable. In addition, a solvent, a polymerization initiator, a chain transfer agent for molecular weight control and the like which are usually used in polymerization can be used.
아크릴계 공중합체는 겔투과크로마토그래피(Gel permeation chromatography, GPC)에 의해 측정된 중량평균분자량(폴리스티렌 환산, Mw)이 5만 내지 200만인 것이 바람직하며, 더 바람직하기로는 40만 내지 200만인 것이 좋다. 중량평균분자량이 5만 미만인 경우 공중합체 간의 응집력이 부족하여 점착 내구성에 문제를 야기할 수 있고, 200만 초과인 경우 도공 시 공정성을 확보하기 위하여 다량의 희석 용매를 필요로 할 수 있다. The acrylic copolymer preferably has a weight average molecular weight (polystyrene conversion, Mw) of 50,000 to 2,000,000, more preferably 400,000 to 2,000,000 as measured by Gel Permeation Chromatography (GPC). When the weight-average molecular weight is less than 50,000, cohesion between co-polymers may be insufficient, which may cause problems in adhesion durability. If the weight average molecular weight is more than 2,000,000, a large amount of a diluting solvent may be required in order to ensure fairness in coating.
본 발명에서 사용 가능한 가교제는 적정 가교도로 점착층이 전술한 탄성률을 만족시킬 수 있게 하는 성분으로서, 예를 들어, 이소시아네이트계, 에폭시계, 멜라민계, 과산화물계, 금속킬레이트계, 옥사졸린계 가교제 등을 사용할 수 있고, 아크릴계 공중합체와 가교를 형성하여 적절한 점탄성을 구현하는는 측면에서 바람직하게는 이소시아네이트계, 금속킬레이트계를 사용하는 것이 좋다.The crosslinking agent usable in the present invention is a component which enables the pressure-sensitive adhesive layer to satisfy the above-described elastic modulus with a proper degree of crosslinking, and examples thereof include isocyanate-based, epoxy-based, melamine-based, peroxide based, metal chelating based, oxazoline based cross- And it is preferable to use an isocyanate-based or metal chelate-based system in view of achieving proper viscoelasticity by forming a crosslinking with the acrylic copolymer.
상기 이소시아네이트계는 톨릴렌디이소시아네이트, 자일렌디이소시아네이트, 2,4-디페닐메탄디이소시아네이트, 4,4-디페닐메탄디이소시아네이트, 헥사메틸렌디이소시아네이트, 이소포론디이소시아네이트, 테트라메틸자일렌디이소시아네이트, 나프탈렌디이소시아네이트 등의 디이소시아네이트화합물; 트리메틸올프로판 등의 다가 알콜계 화합물 1몰에 디이소시아네이트 화합물 3몰을 반응시킨 부가체, 디이소시아네이트 화합물 3몰을 자기 축합시킨 이소시아누레이트체, 디이소시아네이트 화합물 3몰 중 2몰로부터 얻어지는 디이소시아네이트 우레아에 나머지 1몰의 디이소시아네이트가 축합된 뷰렛체, 트리페닐메탄트리이소시아네이트, 메틸렌비스트리이소시아네이트 등의 3개의 관능기를 함유하는 다관능 이소시아네이트 화합물 등을 들 수 있다.Examples of the isocyanate-based isocyanate include isocyanate-based compounds such as tolylene diisocyanate, xylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethyl xylene diisocyanate, Diisocyanate compounds such as isocyanate; An adduct obtained by reacting 3 moles of a diisocyanate compound with 1 mole of a polyhydric alcohol compound such as trimethylolpropane, an isocyanurate compound in which 3 moles of a diisocyanate compound is self-condensed, a diisocyanate obtained from 2 moles of 3 moles of a diisocyanate compound And multifunctional isocyanate compounds containing three functional groups such as burette, triphenylmethane triisocyanate and methylene bistriisocyanate in which the remaining one mole of diisocyanate is condensed in urea.
상기 에폭시계는 에틸렌글리콜디글리시딜에테르, 디에틸렌글리콜디글리시딜에테르, 폴리에틸렌글리콜디글리시딜에테르, 프로필렌글리콜디글리시딜에테르, 트리프로필렌글리콜디글리시딜에테르, 폴리프로필렌글리콜디글리시딜에테르, 네오펜틸글리콜디글리시딜에테르, 1,6-헥산디올디글리시딜에테르, 폴리테트라메틸렌글리콜디글리시딜에테르, 글리세롤디글리시딜에테르, 글리세롤트리글리시딜에테르, 디글리세롤폴리글리시딜에테르, 폴리글리세롤폴리글리시딜에테르, 레졸신디글리시딜에테르, 2,2-디브로모네오펜틸글리콜디글리시딜에테르, 트리메틸올프로판트리글리시딜에테르, 펜타에리트리톨폴리글리시딜에테르, 소르비톨폴리글리시딜에테르, 아디핀산디글리시딜에스테르, 프탈산디글리시딜에스테르, 트리스(글리시딜)이소시아누레이트, 트리스(글리시독시에틸)이소시아누레이트, 1,3-비스(N,N-글리시딜아미노메틸)시클로헥산, N,N,N',N'-테트라글리시딜-m-자일릴렌디아민 등을 들 수 있다.The epoxy system may be an ethylene glycol diglycidyl ether, a diethylene glycol diglycidyl ether, a polyethylene glycol diglycidyl ether, a propylene glycol diglycidyl ether, a tripropylene glycol diglycidyl ether, a polypropylene glycol di Hexanediol diglycidyl ether, polytetramethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, diethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, Glycerol polyglycidyl ether, polyglycerol polyglycidyl ether, resorcinol diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, trimethylol propane triglycidyl ether, pentaerythritol poly Glycidyl ether, sorbitol polyglycidyl ether, adipic acid diglycidyl ester, phthalic acid diglycidyl ester, tris (glycidyl) isocyanurate N, N, N ', N'-tetraglycidyl-m-hexyldicyclohexyl) isocyanurate, 1,3-bis (N, N-glycidylaminomethyl) cyclohexane, Xylylenediamine, and the like.
상기 금속킬레이트계로는 알루미늄(Al), 철(Fe), 아연(Zn), 주석(Sn), 티탄, 안티몬(Sb), 마그네슘(Mg) 및 바나듐(Va)과 같은 다가 금속에 아세틸 아세톤 또는 아세토 초산 에틸 등이 배위하고 있는 화합물 등을 들 수 있다.Examples of the metal chelating agent include a metal chelating agent such as aluminum (Al), iron (Fe), zinc (Zn), tin (Sn), titanium, antimony (Sb), magnesium (Mg), and vanadium And compounds in which ethyl acetate or the like is coordinated.
상기 멜라민계로는 헥사메티롤멜라민, 헥사메톡시메틸멜라민, 헥사부톡시메틸멜라민 등을 들 수 있다.Examples of the melamine series include hexamethylol melamine, hexamethoxymethyl melamine, and hexabutoxymethyl melamine.
이제 본 발명에 따른 터치 센서를 포함하는 적층 구조체에 대해 설명한다.Now, a laminated structure including a touch sensor according to the present invention will be described.
도 2는 본 발명의 일 실시예에 따른 적층 구조체의 단면도이다.2 is a cross-sectional view of a laminated structure according to an embodiment of the present invention.
도 2를 참조하면, 본 발명의 일 실시예에 따른 적층 구조체는 상술한 바와 같은 본 발명의 일 실시예에 따른 터치 센서(10) 및 터치 센서(10) 상부의 윈도우(20)를 포함하여 이루어진다.2, a laminated structure according to an embodiment of the present invention includes a touch sensor 10 according to an embodiment of the present invention and a window 20 on the touch sensor 10 .
터치 센서(10)와 윈도우(20)는 터치 센서(10)의 상부 점착층(도 1:130)을 통해 접합될 수 있다.The touch sensor 10 and the window 20 may be bonded to each other through the upper adhesive layer 130 of the touch sensor 10 (FIG. 1).
윈도우(20)는 하드코팅 필름이 구비되며, 윈도우(20)의 일면에, 편광자를 포함하는 편광층(도시하지 않음)을 포함할 수 있다. 또한, 필요에 따라 윈도우(20)는 점접착층을 사이에 두고 보호필름이 게재된 편광층을 구비할 수 있다.The window 20 is provided with a hard coating film and may include, on one side of the window 20, a polarizing layer (not shown) including a polarizer. If necessary, the window 20 may be provided with a polarizing layer on which a protective film is placed with a point-adhesive layer interposed therebetween.
또한, 윈도우(20) 또는 편광층의 적어도 일면에 테두리를 둘러싸고 인쇄된 유색의 차광 패턴이 구비될 수 있으며, 차광 패턴은 단층 또는 복층의 형태일 수도 있다. Also, a colored light shielding pattern printed on the window 20 or the polarizing layer on at least one side of the frame may be provided, and the light shielding pattern may be a single layer or a multi-layered form.
편광층은, 예를 들어, 비표시영역 또는 베젤부에 걸쳐 연속적으로 연장될 수 있으며, 폴리비닐알코올계 편광자 및 폴리비닐알코올계 편광자의 적어도 일면에 부착된 보호필름을 포함하는 통상적인 편광판일 수 있다. 편광층의 다른 예로는, 중합성 액정 화합물 및 이색성 염료를 포함하는 액정 코팅층을 포함하며, 액정 코팅층에 배향성을 부여하기 위한 배향막을 더 포함할 수 있다. The polarizing layer can be, for example, a continuous polarizing plate which can be continuously extended over the non-display region or the bezel portion and includes a protective film attached to at least one side of the polyvinyl alcohol polarizer and the polyvinyl alcohol polarizer have. Another example of the polarizing layer includes a liquid crystal coating layer containing a polymerizable liquid crystal compound and a dichroic dye, and may further include an alignment layer for imparting orientation to the liquid crystal coating layer.
이제 본 발명에 따른 터치 센서를 포함하는 표시 장치에 대해 설명한다.Now, a display device including a touch sensor according to the present invention will be described.
도 3은 본 발명의 일 실시예에 따른 표시 장치의 단면도이다.3 is a cross-sectional view of a display device according to an embodiment of the present invention.
도 3을 참조하면, 본 발명의 일 실시예에 따른 표시 장치는 상술한 바와 같은 본 발명의 일 실시예에 따른 터치 센서(10), 터치 센서(10) 상부의 윈도우(20) 및 터치 센서(10) 하부의 표시층(30)을 포함하여 이루어진다.3, a display device according to an exemplary embodiment of the present invention includes a touch sensor 10 according to an embodiment of the present invention, a window 20 on the touch sensor 10, And a display layer (30) under the display layer (10).
윈도우(20)는 도 2를 참조하여 설명한 바와 같은 것일 수 있으며, 윈도우(20)가 편광층을 포함하는 경우, 시인측 기준으로 터치 센서(10)가 편광층 하측에 존재하므로 터치 센서(10)의 패턴이 잘 시인되지 않는 장점이 있다. 특히 본 발명의 실시예에 따른 터치 센서(10)는 기재가 없는 형태의 터치 센서(10)이므로 터치 센서(10)가 윈도우(20)에 전사되는 구조를 가질 수 있으며, 윈도우(20)가 편광층을 포함하는 경우 터치 센서(10)가 편광층에 전사될 수 있다.2, when the window 20 includes a polarizing layer, since the touch sensor 10 is located on the lower side of the polarizing layer on the viewing side, The pattern of the light source is not well visible. Particularly, since the touch sensor 10 according to the embodiment of the present invention is a touch sensor 10 having no base material, the touch sensor 10 can be transferred to the window 20, Layer, the touch sensor 10 can be transferred to the polarizing layer.
표시층(30)으로는 유연성 표시 장치에 적용할 수 있는 것을 제한 없이 사용할 수 있으며, 예를 들면, OLED층이거나 LCD층일 수 있지만, 이에 한정되는 것은 아니다. The display layer 30 may be any of those applicable to a flexible display device, and may be, for example, an OLED layer or an LCD layer, but is not limited thereto.
실시예 및 비교예Examples and Comparative Examples
다양한 두께와 탄성률의 상부 및 하부 점착층을 갖는 터치 센서를 제조하여 굴곡에 대한 내구성을 평가하였다.The durability against bending was evaluated by manufacturing a touch sensor having upper and lower adhesive layers of various thicknesses and elastic moduli.
내구성 평가는 제조된 터치 센서의 가운데를 접었다 폈다 하는 방식으로 폴딩(folding) 평가를 진행하였다. 폴딩시의 반지름은 1R(반지름 1mm)로 설정하고, 폴딩 횟수는 1만회를 기준으로 하였다.The durability evaluation was performed by folding the middle of the manufactured touch sensor. The radius at the time of folding was set to 1R (radius 1 mm), and the number of times of folding was set to 10,000 times.
터치 기능은 FPCB 본딩 후 드라이버 IC에서 나오는 출력 값을 기준으로 내구성 평가 전과 후를 비교하여 터치센서의 ITO 개방이나 단락 현상을 관찰하여 문제가 없으면 OK로 판정하였다.The touch function was evaluated by comparing the output value from the driver IC after FPCB bonding, before and after the durability evaluation, and it was judged OK when the ITO opening or short circuit phenomenon of the touch sensor was observed.
트레이스 크랙과 편광층 크랙은 폴딩 평가를 진행한 후 트레이스와 편광층을 육안으로 확인하여 크랙 발생이 없으면 OK로 판정하였다.The trace cracks and the polarizing layer cracks were evaluated by folding, and then the traces and the polarizing layer were visually observed.
아래의 표 1은 내구성 평가 결과를 보여주고 있다.Table 1 below shows the durability evaluation results.
구분division 상부 점착층The upper adhesive layer 하부 점착층Lower adhesive layer 터치기능Touch function 트레이스크랙Trace crack 편광층크랙Polarizing layer crack T1/T2T1 / T2 M2/M1M2 / M1
두께(㎛)Thickness (㎛) 탄성률(MPa)Modulus of elasticity (MPa) 두께(㎛)Thickness (㎛) 탄성률(MPa)Modulus of elasticity (MPa)
실시예1Example 1 2525 0.050.05 55 0.900.90 OKOK OKOK OKOK 5.005.00 18.0018.00
실시예2Example 2 2020 0.100.10 55 0.900.90 OKOK OKOK OKOK 4.004.00 9.009.00
실시예3Example 3 1515 0.400.40 55 0.500.50 OKOK OKOK OKOK 3.003.00 1.251.25
실시예4Example 4 5050 0.050.05 2020 0.900.90 OKOK OKOK OKOK 2.502.50 18.0018.00
실시예5Example 5 55 0.500.50 22 5.005.00 OKOK OKOK OKOK 2.502.50 10.0010.00
실시예6Example 6 4040 0.100.10 1010 2.002.00 OKOK OKOK OKOK 4.004.00 20.0020.00
실시예7Example 7 1010 0.500.50 99 0.600.60 OKOK OKOK OKOK 1.101.10 1.201.20
실시예8Example 8 1010 0.600.60 88 0.700.70 OKOK OKOK OKOK 1.251.25 1.161.16
실시예9Example 9 1010 1.001.00 55 1.501.50 OKOK OKOK OKOK 2.002.00 1.501.50
비교예1Comparative Example 1 55 0.900.90 55 0.900.90 OKOK OKOK NGNG 1.001.00 1.001.00
비교예2Comparative Example 2 1010 0.200.20 55 5.005.00 NGNG NGNG NGNG 2.002.00 25.0025.00
비교예3Comparative Example 3 2525 0.030.03 2525 0.050.05 NGNG NGNG OKOK 1.001.00 1.601.60
비교예4Comparative Example 4 2020 0.100.10 2525 0.050.05 NGNG NGNG OKOK 0.800.80 0.500.50
비교예5Comparative Example 5 1515 0.500.50 2525 0.050.05 NGNG NGNG OKOK 0.600.60 0.100.10
비교예6Comparative Example 6 44 0.900.90 2525 0.050.05 NGNG NGNG NGNG 0.160.16 0.050.05
비교예7Comparative Example 7 6060 0.200.20 1010 6.006.00 NGNG NGNG OKOK 6.006.00 30.0030.00
비교예8Comparative Example 8 100100 0.100.10 1010 0.900.90 NGNG NGNG OKOK 10.0010.00 9.009.00
위의 표 1에 나타난 바와 같이, 터치 기능이 우수하고 트레이스와 편광층에 크랙이 관찰되지 않는 실시예 1~9는, 상부 점착층의 두께(T1)와 탄성률(M1)이 각각 5 내지 50㎛, 0.05 내지 1.00MPa이고, 하부 점착층의 두께(T2)와 탄성률(M2)이 각각 2 내지 20㎛, 0.5 내지 5MPa였다.한편, 비교예 1~8은 터치 기능, 트레이스 크랙, 편광층 크랙 중에서 적어도 하나에서 문제가 발생하였다. 그런데, 비교예 1~8을 보면, 일부가 상부 점착층의 두께(T1)와 탄성률(M1), 그리고 하부 점착층의 두께(T2)와 탄성률(M2)이 터치 기능, 트레이스 크랙, 편광층 크랙의 평가 기준을 모두 통과한 실시예 1~9의 두께, 탄성률의 범위에 포함되어 있다.As shown in Table 1, in Examples 1 to 9, in which the touch function was excellent and no cracks were observed in the trace and the polarization layer, the thickness (T1) of the upper adhesive layer and the elastic modulus (M1) , 0.05 to 1.00 MPa, and the thickness (T2) and elastic modulus (M2) of the lower adhesive layer were respectively 2 to 20 μm and 0.5 to 5 MPa. On the other hand, in Comparative Examples 1 to 8, the touch function, the trace crack, At least one problem occurred. In Comparative Examples 1 to 8, the thickness (T1) and the elastic modulus (M1) of the upper adhesive layer, the thickness (T2) of the lower adhesive layer and the elastic modulus (M2) In the thickness and elastic modulus of Examples 1 to 9, which passed all of the evaluation criteria of "
그러나, 상부 점착층과 하부 점착층의 두께비와 탄성률비를 더 검토해 보면, 평가 기준(터치 기능, 트레이스 크랙, 편광층 크랙)을 모두 통과한 실시예 1~9는 평가 기준 중 적어도 하나를 미충족한 비교예 1~8과 구분되는 것을 확인할 수 있다. 즉, 상부 점착층의 두께를 T1, 하부 점착층의 두께를 T2라고 할 때, 실시예 1~9는 T1/T2가 1.1 내지 5.0 사이의 값을 갖는다. 또한, 상부 점착층의 탄성률을 M1, 상기 하부 점착층의 탄성률을 M2라고 할 때, 실시예 1~9는 M2/M1가 1.16 내지 20.0 사이의 값을 갖는다. 그런데, 비교예 1~8은 실시예 1~9의 두께비, 탄성률비의 범위에서 벗어나 있다.However, when the thickness ratio and the modulus ratio of the upper adhesive layer and the lower adhesive layer were examined further, Examples 1 to 9, which passed all of the evaluation criteria (touch function, trace crack, and polarization layer crack) It can be confirmed that it is distinguished from Comparative Examples 1 to 8. That is, when the thickness of the upper adhesive layer is T1 and the thickness of the lower adhesive layer is T2, in Examples 1 to 9, T1 / T2 has a value between 1.1 and 5.0. Further, when the elastic modulus of the upper adhesive layer is M1 and the elastic modulus of the lower adhesive layer is M2, in Examples 1 to 9, M2 / M1 has a value between 1.16 and 20.0. Incidentally, Comparative Examples 1 to 8 are different from the thickness ratios and the modulus ratios of Examples 1 to 9.
따라서, 하부 점착층, 터치 센서층, 상부 점착층을 적층한 구조의 터치 센서에서, 폴딩 내구성 평가를 충족하려면, 일차적으로 상부 점착층을 하부 점착층보다 두껍게 구성하고, 상부 점착층을 하부 점착층보다 낮은 탄성률을 갖도록 구성할 필요가 있다.Therefore, in order to satisfy the folding durability evaluation in the touch sensor having the structure in which the lower adhesive layer, the touch sensor layer, and the upper adhesive layer are laminated, the upper adhesive layer is made thicker than the lower adhesive layer, It is necessary to configure it to have a lower elastic modulus.
나아가, 폴딩 내구성 평가를 충족하는 세부 조건으로서, 상부 점착층의 두께(T1)는 5 내지 50㎛, 탄성률(M1)은 0.05 내지 1.00MPa이고, 하부 점착층의 두께(T2)는 2 내지 20㎛, 탄성률(M2)은 0.5 내지 5.0MPa이며, 상부 점착층과 하부 점착층의 두께비, 즉 T1/T2는 1.1 내지 5.0 사이의 값을 갖고, 상부 점착층과 하부 점착층의 탄성률비, 즉 M2/M1는 1.16 내지 20.0 사이의 값을 갖는 것을 제시할 수 있다.The thickness T1 of the upper adhesive layer is 5 to 50 mu m, the modulus of elasticity M1 is 0.05 to 1.00 MPa and the thickness T2 of the lower adhesive layer is 2 to 20 mu m And the elastic modulus M2 is 0.5 to 5.0 MPa. The thickness ratio of the upper adhesive layer to the lower adhesive layer, that is, T1 / T2 is 1.1 to 5.0, and the modulus of elasticity of the upper adhesive layer and the lower adhesive layer, M1 may have a value between 1.16 and 20.0.
이상에서 본 발명의 바람직한 실시예에 대하여 도면을 참조하여 설명하였다. 그러나, 본 발명은 상술한 실시예에 한정되는 것은 아니며, 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 변형된 형태로 본 발명이 구현될 수 있음을 이해할 수 있을 것이다. 상술한 본 발명의 실시예들은 독립적으로 또는 그 특징들의 일부 또는 전부를 조합하여 적용될 수 있다. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, it should be understood that the present invention is not limited to the above-described embodiment, and that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. The above-described embodiments of the present invention can be applied independently or in combination of some or all of the features.
그러므로, 본 발명의 범위는 전술한 설명이 아니라 특허청구범위에 의해 정해지며, 그와 동등한 범위 내에 있는 모든 차이점은 본 발명에 포함되는 것으로 해석되어야 할 것이다.Therefore, the scope of the present invention is defined by the appended claims rather than the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
[부호의 설명][Description of Symbols]
110: 하부 점착층 120: 터치 센서층110: lower adhesive layer 120: touch sensor layer
130: 상부 점착층 10: 터치 센서 130: upper adhesive layer 10: touch sensor
20: 윈도우 30: 표시층20: window 30: display layer

Claims (11)

  1. 하부 점착층;A lower adhesive layer;
    상기 하부 점착층 상에 형성된 터치 감지 전극 패턴을 포함하는 터치 센서층; 및A touch sensor layer including a touch sensing electrode pattern formed on the lower adhesive layer; And
    상기 터치 센서층 상의 상부 점착층을 포함하고,And an upper adhesive layer on the touch sensor layer,
    상기 상부 점착층은 상기 하부 점착층보다 두껍고,Wherein the upper adhesive layer is thicker than the lower adhesive layer,
    상기 상부 점착층은 상기 하부 점착층보다 낮은 탄성률을 갖는, 터치 센서.Wherein the upper adhesive layer has a lower elastic modulus than the lower adhesive layer.
  2. 제1항에 있어서, The method according to claim 1,
    상기 하부 점착층의 두께는 2 내지 20㎛, 탄성률은 0.5 내지 5.0MPa이고,The thickness of the lower adhesive layer is 2 to 20 占 퐉, the modulus of elasticity is 0.5 to 5.0 MPa,
    상기 상부 점착층의 두께는 5 내지 50㎛, 탄성률은 0.05 내지 1.00MPa이며,The thickness of the upper adhesive layer is 5 to 50 占 퐉, the modulus of elasticity is 0.05 to 1.00 MPa,
    상기 상부 점착층의 두께를 T1, 상기 하부 점착층의 두께를 T2라고 할 때, T1/T2는 1.1 내지 5.0 사이의 값을 갖고,The thickness of the upper adhesive layer is T1 and the thickness of the lower adhesive layer is T2, T1 / T2 is a value between 1.1 and 5.0,
    상기 상부 점착층의 탄성률을 M1, 상기 하부 점착층의 탄성률을 M2라고 할 때, M2/M1는 1.16 내지 20.0 사이의 값을 갖는, 터치 센서.M2 / M1 has a value between 1.16 and 20.0, where M1 is the elastic modulus of the upper adhesive layer, and M2 is the elastic modulus of the lower adhesive layer.
  3. 제2항에 있어서, 상기 상부 점착층 및 상기 하부 점착층은The method of claim 2, wherein the upper adhesive layer and the lower adhesive layer comprise
    OCA(Optically Clear Adhesive)로 이루어지는, 터치 센서.A touch sensor made of OCA (Optically Clear Adhesive).
  4. 제3항에 있어서,The method of claim 3,
    기재필름을 포함하지 않는, 터치 센서. A touch sensor, comprising no substrate film.
  5. 제1항 내지 제4항 중 어느 한 항의 터치 센서; 및A touch sensor according to any one of claims 1 to 4; And
    상기 상부 점착층을 통해 상기 터치 센서와 접합되는 윈도우를 포함하는, 적층체.And a window bonded to the touch sensor through the upper adhesive layer.
  6. 제5항에 있어서,6. The method of claim 5,
    상기 윈도우는 하드코팅 필름이 구비되고,Wherein the window is provided with a hard coating film,
    상기 윈도우의 일면에 편광자를 포함하는 편광층을 포함하는, 적층체.And a polarizing layer including a polarizer on one side of the window.
  7. 제6항에 있어서, 상기 윈도우는7. The method of claim 6,
    상기 편광층의 적어도 일면에 테두리를 둘러싸고 인쇄되는 유색의 차광 패턴을 더 포함하는, 적층체.Further comprising a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the edge.
  8. 제1항 내지 제4항 중 어느 한 항의 터치 센서;A touch sensor according to any one of claims 1 to 4;
    상기 상부 점착층을 통해 상기 터치 센서와 접합되는 윈도우; 및A window that is bonded to the touch sensor through the upper adhesive layer; And
    상기 하부 점착층을 통해 상기 터치 센서와 접합되는 표시층을 포함하는, 표시 장치.And a display layer bonded to the touch sensor through the lower adhesive layer.
  9. 제8항에 있어서,9. The method of claim 8,
    상기 윈도우는 하드코팅 필름이 구비되고,Wherein the window is provided with a hard coating film,
    상기 윈도우의 일면에 편광자를 포함하는 편광층을 포함하는, 표시 장치.And a polarizing layer including a polarizer on one surface of the window.
  10. 제9항에 있어서, 상기 윈도우는10. The method of claim 9,
    상기 편광층의 적어도 일면에 테두리를 둘러싸고 인쇄되는 유색의 차광 패턴을 더 포함하는, 표시 장치.And a colored shielding pattern printed on at least one side of the polarizing layer to surround and print the frame.
  11. 제8항에 있어서, 상기 표시층은The display device according to claim 8, wherein the display layer
    LCD층 또는 OLED층인 표시 장치.LCD < / RTI > layer or an OLED layer.
PCT/KR2019/000389 2018-01-18 2019-01-10 Touch sensor and display device comprising same WO2019143065A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110531897A (en) * 2019-09-09 2019-12-03 业成科技（成都）有限公司 Cover plate assembly, preparation method, touch panel and display device
EP4020071A4 (en) * 2019-08-19 2022-09-07 BOE Technology Group Co., Ltd. Foldable display screen and fabrication method therefor, and display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014142263A1 (en) * 2013-03-13 2014-09-18 富士フイルム株式会社 Capacitive touch panel
KR20150081568A (en) * 2014-01-06 2015-07-15 삼성전기주식회사 Touch sensor module and Manufacturing method thereof
KR101579710B1 (en) * 2015-11-12 2015-12-22 동우 화인켐 주식회사 Optical laminate and image displaying unit preparing the same
KR20170043301A (en) * 2015-10-13 2017-04-21 동우 화인켐 주식회사 Window film and method of preparing the same
KR20170044385A (en) * 2015-10-15 2017-04-25 동우 화인켐 주식회사 Method and apparatus for manufacturing film touch sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014142263A1 (en) * 2013-03-13 2014-09-18 富士フイルム株式会社 Capacitive touch panel
KR20150081568A (en) * 2014-01-06 2015-07-15 삼성전기주식회사 Touch sensor module and Manufacturing method thereof
KR20170043301A (en) * 2015-10-13 2017-04-21 동우 화인켐 주식회사 Window film and method of preparing the same
KR20170044385A (en) * 2015-10-15 2017-04-25 동우 화인켐 주식회사 Method and apparatus for manufacturing film touch sensor
KR101579710B1 (en) * 2015-11-12 2015-12-22 동우 화인켐 주식회사 Optical laminate and image displaying unit preparing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4020071A4 (en) * 2019-08-19 2022-09-07 BOE Technology Group Co., Ltd. Foldable display screen and fabrication method therefor, and display device
CN110531897A (en) * 2019-09-09 2019-12-03 业成科技（成都）有限公司 Cover plate assembly, preparation method, touch panel and display device

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