WO2017142188A1 - Foldable touch sensor and manufacturing method therefor - Google Patents

Foldable touch sensor and manufacturing method therefor Download PDF

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Publication number
WO2017142188A1
WO2017142188A1 PCT/KR2016/015454 KR2016015454W WO2017142188A1 WO 2017142188 A1 WO2017142188 A1 WO 2017142188A1 KR 2016015454 W KR2016015454 W KR 2016015454W WO 2017142188 A1 WO2017142188 A1 WO 2017142188A1
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WO
WIPO (PCT)
Prior art keywords
touch sensor
region
layer
protective layer
foldable
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Application number
PCT/KR2016/015454
Other languages
French (fr)
Korean (ko)
Inventor
이진구
윤호동
최병진
Original Assignee
동우화인켐 주식회사
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Publication of WO2017142188A1 publication Critical patent/WO2017142188A1/en

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    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • 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
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes

Definitions

  • the present invention relates to a foldable touch sensor. More specifically, the present invention relates to a foldable touch sensor and a method of manufacturing the same, which can improve foldable characteristics while maintaining durability.
  • a touch sensor is a device that detects a touch point in response to the touch when a user touches an image displayed on a screen with a finger or a touch pen.
  • the touch sensor is generally manufactured in a structure that is overlaid on a display device such as a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
  • a display device such as a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
  • the thickness of the protective layer protecting the internal components should be reduced, but the durability of the touch sensor is deteriorated in proportion to the reduction in the thickness of the protective layer.
  • An object of the present invention is to provide a foldable touch sensor and a method of manufacturing the same, which can improve foldable characteristics while maintaining durability.
  • the foldable touch sensor according to the present invention is formed on a base layer, a touch sensor layer formed on the base layer and the touch sensor layer, and is thicker than the first area and the first area formed along one direction.
  • the protective layer has a thickness of 0.5 ⁇ m or more and 10 ⁇ m or less.
  • the minimum thickness of the first region is 0.5 ⁇ m or more and 1.5 ⁇ m or less.
  • the thickness of the second region is 1.5 ⁇ m or more and 10 ⁇ m or less.
  • the first region has an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region has a curved shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region has a planar shape.
  • a touch sensor layer forming step of forming a touch sensor layer on a base layer and a first region along one direction on the touch sensor layer using a halftone mask are performed.
  • the protective layer in the method for manufacturing a foldable touch sensor according to the present invention, in the forming of the protective layer, the protective layer may be formed to have a thickness of 0.5 ⁇ m or more and 10 ⁇ m or less.
  • the minimum thickness of the first region is formed to be 0.5 ⁇ m or more and 1.5 ⁇ m or less.
  • the thickness of the second region may be formed to be 1.5 ⁇ m or more and 10 ⁇ m or less.
  • the first region is formed to have an inclined surface shape that becomes thinner as the first region approaches the folding line.
  • the first region is formed to have a curved shape that becomes thinner as the first region approaches the folding line.
  • the first region in the forming of the protective layer, may be formed to have a planar shape.
  • FIG. 1 is a view schematically showing the overall planar shape of a foldable touch sensor according to an embodiment of the present invention
  • FIG. 2 is an enlarged view of a region A shown in FIG. 1,
  • 3A is a cross-sectional view of a foldable touch sensor according to an embodiment of the present invention.
  • 3B and 3C are cross-sectional views of a foldable touch sensor according to modified embodiments of an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a method of manufacturing a foldable touch sensor according to an exemplary embodiment of the present invention.
  • 5 to 9C are cross-sectional views illustrating a method of manufacturing a foldable touch sensor according to an exemplary embodiment.
  • first or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example without departing from the scope of the rights according to the inventive concept, and the first component may be called a second component and similarly the second component. The component may also be referred to as the first component.
  • FIG. 1 is a view schematically showing an overall planar shape of a foldable touch sensor according to an exemplary embodiment.
  • a foldable touch sensor may be divided into a display area and a non-display area based on whether visual information is displayed.
  • the non-display area is represented to be larger than the actual one in order to improve visibility of the components included in the non-display area.
  • the display area is an area where an image provided by a device coupled to the touch sensor is displayed, and an area for capacitively detecting touch signals input from a user.
  • the display area includes a plurality of sensing areas formed in directions crossing each other. Components comprising patterns are formed.
  • electrode pads electrically connected to the sensing patterns, sense lines electrically connected to the electrode pads, and bonding pads electrically connected to the sensing lines are formed.
  • the bonding pad is connected to a flexible printed circuit (FPC) that transmits a touch signal sensed in the display area to a driver (not shown).
  • FPC flexible printed circuit
  • FIG. 2 is an enlarged view of a region A shown in FIG. 1.
  • the touch sensor layer 40 constituting the foldable touch sensor according to the exemplary embodiment of the present invention is disclosed, and the touch sensor layer 40 includes the first sensing patterns 41. ), Second sensing patterns 42, an insulating layer 45, and connection patterns 47.
  • the first sensing patterns 41 are formed along the first direction while being electrically connected to each other, and the second sensing patterns 42 are formed along the second direction while being electrically separated from each other.
  • the two directions are directions crossing with the first direction.
  • the first direction is the X direction
  • the second direction may be the Y direction.
  • the insulating layer 45 is formed between the first sensing patterns 41 and the second sensing patterns 42, and electrically insulates the first sensing patterns 41 and the second sensing patterns 42. Let's do it.
  • the connection patterns 47 electrically connect adjacent second sensing patterns 42.
  • 3A is a cross-sectional view of a foldable touch sensor according to an exemplary embodiment.
  • a foldable touch sensor includes a base layer 80, a touch sensor layer 40, and a protective layer 51.
  • the base layer 10 is a substrate on which the components of the touch sensor are formed, and may be a transparent material having a hard or soft material.
  • the base layer 10 may be a transparent optical film or a polarizing plate.
  • polyester-based resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether ether ketone resin
  • thermosetting resin or ultraviolet curable resin such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, and silicone type
  • the thickness of such a transparent optical film can be suitably determined, generally, it can be determined to 1-500 micrometers in consideration of workability, thinness, etc., such as intensity
  • Such a transparent optical film may contain an appropriate one or more additives.
  • an additive a ultraviolet absorber, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example.
  • the transparent optical film may have a structure including various functional layers such as a hard coating layer, an antireflection layer, and a gas barrier layer on one or both surfaces of the film, and the functional layer is not limited to the above-described ones, and various functional layers may be formed depending on the purpose. It may include.
  • the transparent optical film may be surface-treated as needed.
  • Such surface treatments include, for example, plasma treatments, corona treatments, dry treatments such as primer treatments, and chemical treatments such as alkali treatments including saponification treatments.
  • the transparent optical film may be an isotropic film, a retardation film or a protective film.
  • Retardation film is a film produced by the method of uniaxial stretching, biaxial stretching, polymer coating, liquid crystal coating of a polymer film, and is generally used for improving and controlling optical properties such as viewing angle compensation, color improvement, light leakage, and color taste control of a display. do.
  • Types of the retardation film include a wave plate such as 1/2 or 1/4, a positive C plate, a negative C plate, a positive A plate, a negative A plate, and a biaxial wave plate.
  • the protective film may be a film including an adhesive layer on at least one surface of a film made of a polymer resin, or a film having self-adhesiveness such as polypropylene, and may be used for protecting the touch sensor surface and improving processability.
  • a polarizing plate As a polarizing plate, a well-known thing used for a display panel can be used. Specifically, a polyvinyl alcohol film is drawn to form a protective layer on at least one surface of a polarizer dyed iodine or a dichroic dye, made by orienting the liquid crystal to have the performance of the polarizer, polyvinyl film on a transparent film And coating the alignment resin such as alcohol, stretching and dyeing the same, and the like, but are not limited thereto.
  • a polarizer dyed iodine or a dichroic dye made by orienting the liquid crystal to have the performance of the polarizer, polyvinyl film on a transparent film
  • the alignment resin such as alcohol, stretching and dyeing the same, and the like, but are not limited thereto.
  • the touch sensor layer 40 is formed on the base layer 10 and is a component for detecting a touch signal input by a user.
  • the sensing patterns constituting the touch sensor layer 40 may be formed in an appropriate shape according to the requirements of the electronic device to which the touch sensor layer 40 is applied. For example, when applied to a touch screen panel, the sensing pattern and the y coordinate may be detected. It may be formed of two types of patterns to detect, but is not limited thereto.
  • the touch sensor layer 40 may include first sensing patterns 41, second sensing patterns 42, insulating layer 45, and connection patterns 47.
  • the first sensing patterns 41 are formed along the first direction while being electrically connected to each other, and the second sensing patterns 42 are formed along the second direction while being electrically separated from each other.
  • the two directions are directions crossing with the first direction.
  • the first direction is the X direction
  • the second direction may be the Y direction.
  • the insulating layer 45 is formed between the first sensing patterns 41 and the second sensing patterns 42, and electrically insulates the first sensing patterns 41 and the second sensing patterns 42. Let's do it.
  • connection patterns 47 electrically connect adjacent second sensing patterns 42.
  • the first sensing patterns 41, the second sensing patterns 42, and the connection patterns 47 may be used without limitation as long as it is a transparent conductive material.
  • indium tin oxide (ITO) and indium zinc oxide may be used.
  • IZO indium zinc tin oxide
  • IZTO aluminum zinc oxide
  • AZO aluminum zinc oxide
  • GZO gallium zinc oxide
  • florin tin oxide (FTO) indium tin oxide-silver-indium tin oxide
  • ITO-Ag-ITO Indium zinc oxide-silver-indium zinc oxide
  • IZO-Ag-IZO Indium zinc oxide-silver-indium zinc oxide
  • IZTO-Ag-IZTO indium zinc tin oxide-silver-indium zinc tin oxide
  • AZO-Ag- AZO aluminum zinc oxide-silver-aluminum zinc oxide
  • metal oxides selected from the group consisting of; Metals selected from the group consisting of gold (Au), silver
  • the thickness of the touch sensor layer 40 is not particularly limited, but in consideration of flexibility of the touch sensor, the thickness of the touch sensor layer 40 is preferably as thin as possible.
  • the thickness of the touch sensor layer 40 may be 0.01 to 5 ⁇ m, preferably 0.03 to 0.5 ⁇ m.
  • the first sensing patterns 41 and the second sensing patterns 42 constituting the touch sensor layer 40 may be trigonal, pentagonal, pentagonal, hexagonal, or more than seven polygons independently of each other. It may be a pattern.
  • the touch sensor layer 40 may include a rule pattern.
  • a regular pattern means that the pattern form has regularity.
  • the sensing patterns may include, independently of each other, a mesh shape such as a rectangle or a square, or a pattern shape such as a hexagon.
  • the touch sensor layer 40 may include an irregular pattern.
  • Irregular pattern means that the shape of the pattern does not have regularity.
  • the sensing patterns constituting the touch sensor layer 40 are formed of a material such as metal nanowires, carbon-based materials, polymer materials, or the like, the sensing patterns may have a network structure.
  • the sensing patterns may have a network structure, signals are sequentially transmitted to adjacent patterns in contact with each other, thereby realizing a pattern having high sensitivity.
  • the sensing patterns constituting the touch sensor layer 40 may be formed of a single layer or a plurality of layers.
  • an insulating material known in the art may be used without limitation, for example, silicon oxide, A photosensitive resin composition or a thermosetting resin composition containing a metal oxide or an acrylic resin can be used.
  • the insulating layer 45 may be formed using an inorganic material such as silicon oxide (SiOx), and in this case, the insulating layer 45 may be formed by deposition, sputtering, or the like.
  • the protective layer 51 is formed on the touch sensor layer 40 and includes a first region formed along one direction and a second region that is thicker than the first region and excludes the first region.
  • the protective layer 51 is formed of an insulating material and includes the first sensing patterns 41, the second sensing patterns 42, the insulating layer 45, and the connection patterns 47 constituting the touch sensor layer 40. ) Is formed to cover, to insulate and protect the touch sensor layer 40 from the outside.
  • the protective layer 51 may be formed of a single layer or a plurality of layers of two or more layers.
  • one direction which is a direction in which the first region is formed, may be a first direction in which the first sensing patterns 41 are formed or a second direction in which the second sensing patterns 42 are formed.
  • it is not necessarily limited thereto.
  • the first area formed along one direction becomes a folding line which is a line where the touch sensor is folded when the user folds the touch sensor.
  • the thickness of the protective layer 51 is not reduced as a whole to reduce the foldable characteristics of the touch sensor, only the thickness A of the first region serving as the folding line is reduced to a predetermined level. While meeting the durability requirements of the sensor, it is possible to ensure foldable characteristics.
  • the thickness of the protective layer 51 is preferably 0.5 ⁇ m or more and 10 ⁇ m or less.
  • the thickness of the protective layer 51 is less than 0.5 ⁇ m, the durability of the protective layer 51 is weakened, so that elements constituting the touch sensor layer 40 cannot be sufficiently protected from external factors such as impact, and the like.
  • the thickness of 51 exceeds 10 micrometers, the foldable characteristic of a touch sensor will fall, the uniformity of the protective layer 51 will fall largely, and the performance quality of a touch sensor will fall.
  • region is 0.5 micrometer or more and 1.5 micrometers or less. Since the first area is an area excluding the second area from the entire area of the protective layer 51, when the user folds the touch sensor, the first area becomes an folding line which is a folding line of the touch sensor. Compared to the thinner configuration. When the thickness A of the first region is less than 0.5 ⁇ m, durability of the first region of the protective layer 51, that is, the folding line, is weakened, so that elements constituting the touch sensor layer 40 may not be sufficiently protected.
  • the thickness A of the first region is less than 0.5 ⁇ m
  • cracks may be formed in the elements constituting the first region and the touch sensor layer 40 thereunder. cracks) and the durability of the touch sensor is degraded.
  • region exceeds 1.5 micrometers, the foldable characteristic in a 1st area
  • region is 1.5 micrometers or more and 10 micrometers or less.
  • the thickness B of the second region is less than 1.5 ⁇ m, the durability of the second region of the protective layer 51 is weakened to sufficiently protect the elements constituting the touch sensor layer 40 from external factors such as impact. If the thickness B of the second region exceeds 10 ⁇ m, the foldable property of the touch sensor is lowered, the uniformity of the protective layer 51 is greatly lowered, and the performance quality of the touch sensor is lowered.
  • the thickness A of the first area which is a folding line, which is a line where the touch sensor is folded, is made thinner than the thickness B of the second area.
  • the foldable characteristics can be further improved while maintaining the durability of the touch sensor.
  • Examples of the specific shape of the first region are as follows.
  • the first region may have an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region may have a curved shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region may have a planar shape.
  • 3A, 3B, and 3C only disclose examples of the shape of the first region of the protective layers 51, 52, 53, in addition to these examples the first region may be characterized by the durability of the protective layers 51, 52, 53. It may have various shapes to secure the foldable characteristics.
  • an insulating material known in the art may be used without limitation, and for example, an excellent material in transparency, flexibility, mechanical strength, thermal stability, moisture shielding, and isotropy may be used. Can be.
  • an organic insulating film may be applied as the material of the protective layers 51, 52, and 53, and may be formed of a curable composition including a polyol and a melamine curing agent. It doesn't happen.
  • polyol examples include, but are not limited to, polyether glycol derivatives, polyester glycol derivatives, polycaprolactone glycol derivatives, and the like.
  • melamine curing agents include methoxy methyl melamine derivatives, methyl melamine derivatives, butyl melamine derivatives, isobutoxy melamine derivatives and butoxy melamine Derivatives and the like, but are not limited thereto.
  • the protective layers 51, 52, and 53 may be formed of an organic-inorganic hybrid curable composition, and when using an organic compound and an inorganic compound at the same time, cracks generated during peeling may be reduced. desirable.
  • the organic compound the above-described components may be used, and the inorganic material may include silica-based nanoparticles, silicon-based nanoparticles, glass nanofibers, and the like, but is not limited thereto.
  • FIGS. 5 to 9A are cross-sectional views illustrating a method of manufacturing a foldable touch sensor according to an embodiment of the present invention.
  • the method of manufacturing a foldable touch sensor includes a touch sensor layer forming step S10 and a protective layer forming step S20.
  • a process of forming the touch sensor layer 40 on the base layer 10 is performed.
  • the touch sensor layer 40 is a component for detecting a touch signal input by a user.
  • the sensing patterns constituting the touch sensor layer 40 may be formed in an appropriate shape according to a request of an applied electronic device, and for example, when applied to a touch screen panel, a pattern for sensing x coordinates. And it may be formed of two kinds of patterns of the pattern for detecting the y coordinate, but is not limited thereto.
  • the first sensing patterns 41 connected to each other along the first direction and the second sensing patterns 42 separated from each other along the second direction crossing the first direction are formed.
  • the process is carried out.
  • the first direction is the X direction
  • the second direction may be the Y direction.
  • the insulating layer 45 electrically insulates the first sensing patterns 41 and the second sensing patterns 42.
  • connection patterns 47 for electrically connecting adjacent second sensing patterns 42 is performed.
  • the first sensing patterns 41, the second sensing patterns 42, and the connection patterns 47 may be used without limitation as long as it is a transparent conductive material.
  • indium tin oxide (ITO) and indium zinc oxide may be used.
  • IZO indium zinc tin oxide
  • IZTO aluminum zinc oxide
  • AZO aluminum zinc oxide
  • GZO gallium zinc oxide
  • florin tin oxide (FTO) indium tin oxide-silver-indium tin oxide
  • ITO-Ag-ITO Indium zinc oxide-silver-indium zinc oxide
  • IZO-Ag-IZO Indium zinc oxide-silver-indium zinc oxide
  • IZTO-Ag-IZTO indium zinc tin oxide-silver-indium zinc tin oxide
  • AZO-Ag- AZO aluminum zinc oxide-silver-aluminum zinc oxide
  • metal oxides selected from the group consisting of; Metals selected from the group consisting of gold (Au), silver
  • the thickness of the touch sensor layer 40 is not particularly limited, but in consideration of flexibility of the touch sensor, the thickness of the touch sensor layer 40 is preferably as thin as possible.
  • the thickness of the touch sensor layer 40 may be 0.01 to 5 ⁇ m, preferably 0.03 to 0.5 ⁇ m.
  • the first sensing patterns 41 and the second sensing patterns 42 constituting the touch sensor layer 40 may be trigonal, pentagonal, pentagonal, hexagonal, or more than seven polygons independently of each other. It may be a pattern.
  • the touch sensor layer 40 may include a rule pattern.
  • a regular pattern means that the pattern form has regularity.
  • the sensing patterns may include, independently of each other, a mesh shape such as a rectangle or a square, or a pattern shape such as a hexagon.
  • the touch sensor layer 40 may include an irregular pattern.
  • Irregular pattern means that the shape of the pattern does not have regularity.
  • the sensing patterns constituting the touch sensor layer 40 are formed of a material such as metal nanowires, carbon-based materials, polymer materials, or the like, the sensing patterns may have a network structure.
  • the sensing patterns may have a network structure, signals are sequentially transmitted to adjacent patterns in contact with each other, thereby realizing a pattern having high sensitivity.
  • the sensing patterns constituting the touch sensor layer 40 may be formed of a single layer or a plurality of layers.
  • an insulating material known in the art may be used without limitation, for example, silicon oxide, A photosensitive resin composition or a thermosetting resin composition containing a metal oxide or an acrylic resin can be used.
  • the insulating layer 45 may be formed using an inorganic material such as silicon oxide (SiOx), and in this case, the insulating layer 45 may be formed by deposition, sputtering, or the like.
  • 9A, 9B, and 9C are diagrams for describing the protective layer forming step S20.
  • a protective layer forming material layer 50 is formed on the entire surface of the touch sensor layer 40, and a halftone mask M is formed on the protective layer forming material layer 50.
  • a process of differentially exposing and developing the protective layer forming material layer 50 using the halftone mask M is performed.
  • the halftone mask M has a light transmittance pattern corresponding to the shape of the target pattern. That is, when the light emitted from the exposure machine reaches the halftone mask M, the light reaching the halftone mask M corresponds to the light transmittance pattern of the halftone mask M. Since the light passes through the protective layer forming material layer 50, the protective layer forming material layer 50 is exposed in correspondence with the light transmittance pattern of the halftone mask M.
  • the protective layer forming material layer 50 may be formed to a thickness of 10 ⁇ m or less.
  • 9A, 9B, and 9C illustrate examples of various shapes of the protective layer that may be obtained through the protective layer forming step S20.
  • the first region may have an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region may have a curved shape in which the thickness becomes thinner as it approaches the folding line.
  • the first region may have a planar shape.
  • 9A, 9B, and 9C only disclose examples of the shape of the first region of the protective layer.
  • the first region may have various shapes to secure durability and foldable characteristics of the protective layer. .
  • a foldable touch sensor and a method of manufacturing the same may be provided while maintaining durability and improving foldable characteristics.

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  • General Engineering & Computer Science (AREA)
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Abstract

The present invention relates to a foldable touch sensor. The present invention comprises: a base layer; a touch sensor layer formed on the base layer; and a protection layer formed on the touch sensor layer, and comprises a first region formed along one direction, and a second region which is thicker than the first region and which is a region excluding the first region. According to the present invention, there is an effect of maintaining durability of the foldable touch sensor and simultaneously improving foldable characteristics.

Description

폴더블 터치 센서 및 그 제조방법Foldable touch sensor and its manufacturing method
본 발명은 폴더블 터치 센서에 관한 것이다. 보다 구체적으로, 본 발명은 내구성을 유지하는 동시에 폴더블 특성을 향상시킬 수 있는 폴더블 터치 센서 및 그 제조방법에 관한 것이다.The present invention relates to a foldable touch sensor. More specifically, the present invention relates to a foldable touch sensor and a method of manufacturing the same, which can improve foldable characteristics while maintaining durability.
일반적으로 터치 센서는 사용자가 화면에 디스플레이되는 영상을 손가락이나 터치 펜 등으로 접촉하는 경우 이 접촉에 반응하여 터치 지점을 파악하는 장치이다.In general, a touch sensor is a device that detects a touch point in response to the touch when a user touches an image displayed on a screen with a finger or a touch pen.
이러한 터치 센서는 일반적으로 액정 표시 패널(Liquid Crystal Display, LCD), 유기 EL(Organic light-Emitting Diode, OLED) 등과 같은 디스플레이 장치에 덧씌워지는 구조로 제작된다.The touch sensor is generally manufactured in a structure that is overlaid on a display device such as a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
한편, 최근에는 유리 기판을 대체하는 고분자 필름을 이용하여 보다 얇고 가벼우며 구부리거나 접을 수 있는 폴더블(foldable) 터치센서 및 디스플레이에 대한 연구가 활발하게 진행되고 있다.On the other hand, recently, research on thinner, lighter, foldable touch sensors and displays that can be bent or folded using polymer films replacing glass substrates has been actively conducted.
터치 센서의 폴더블 특성을 높이기 위해서는 내부 구성요소들을 보호하는 보호층의 두께를 줄여야 하지만, 보호층의 두께 감소에 비례하여 터치 센서의 내구성이 저하되는 문제점이 있다.In order to increase the foldable characteristics of the touch sensor, the thickness of the protective layer protecting the internal components should be reduced, but the durability of the touch sensor is deteriorated in proportion to the reduction in the thickness of the protective layer.
따라서 터치 센서의 내구성을 유지하는 동시에 폴더블 특성을 향상시킬 수 있는 기술이 요구된다.Therefore, a technique for improving the foldable characteristics while maintaining the durability of the touch sensor is required.
[선행기술문헌][Preceding technical literature]
[특허문헌][Patent Documents]
대한민국 공개특허공보 제10-2012-0008153호(공개일자: 2012년 01월 30일, 명칭: 정전용량 방식 터치 스크린 패널 및 그 제조방법)Republic of Korea Patent Application Publication No. 10-2012-0008153 (published date: January 30, 2012, name: capacitive touch screen panel and its manufacturing method)
대한민국 공개특허공보 제10-2012-0069226호(공개일자: 2012년 06월 28일, 명칭: 터치 스크린 패널 및 그의 제조방법)Korean Laid-Open Patent Publication No. 10-2012-0069226 (published date: June 28, 2012, name: touch screen panel and its manufacturing method)
본 발명은 내구성을 유지하는 동시에 폴더블 특성을 향상시킬 수 폴더블 터치 센서 및 그 제조방법을 제공하는 것을 기술적 과제로 한다.An object of the present invention is to provide a foldable touch sensor and a method of manufacturing the same, which can improve foldable characteristics while maintaining durability.
본 발명에 따른 폴더블 터치 센서는 기재층과, 상기 기재층 상에 형성된 터치 센서층 및 상기 터치 센서층 상에 형성되어 있으며, 일 방향을 따라 형성된 제1 영역과 상기 제1 영역보다 두꺼우며 상기 제1 영역을 제외한 영역인 제2 영역으로 이루어진 보호층을 포함한다.The foldable touch sensor according to the present invention is formed on a base layer, a touch sensor layer formed on the base layer and the touch sensor layer, and is thicker than the first area and the first area formed along one direction. A protective layer including a second region, which is a region other than the first region, is included.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 보호층의 두께는 0.5㎛ 이상 10㎛ 이하인 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the protective layer has a thickness of 0.5 μm or more and 10 μm or less.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 제1 영역의 최소 두께는 0.5㎛ 이상 1.5㎛ 이하인 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the minimum thickness of the first region is 0.5 µm or more and 1.5 µm or less.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 제2 영역의 두께는 1.5㎛ 이상 10㎛ 이하인 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the thickness of the second region is 1.5 μm or more and 10 μm or less.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 제1 영역은 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 갖는 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the first region has an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 제1 영역은 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 갖는 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the first region has a curved shape in which the thickness becomes thinner as it approaches the folding line.
본 발명에 따른 폴더블 터치 센서에 있어서, 상기 제1 영역은 평면 형상을 갖는 것을 특징으로 한다.In the foldable touch sensor according to the present invention, the first region has a planar shape.
본 발명에 따른 폴더블 터치 센서 제조방법은 기재층 상에 터치 센서층을 형성하는 터치 센서층 형성단계 및 하프톤 마스크(halftone mask)를 이용하여 상기 터치 센서층 상에 일 방향을 따르는 제1 영역과 상기 제1 영역보다 두꺼우며 상기 제1 영역을 제외한 영역인 제2 영역으로 이루어진 보호층을 형성하는 보호층 형성단계를 포함한다.In the method for manufacturing a foldable touch sensor according to the present invention, a touch sensor layer forming step of forming a touch sensor layer on a base layer and a first region along one direction on the touch sensor layer using a halftone mask are performed. And a protective layer forming step of forming a protective layer including a second region that is thicker than the first region and is a region other than the first region.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 보호층의 두께를 0.5㎛ 이상 10㎛ 이하로 형성하는 것을 특징으로 한다.In the method for manufacturing a foldable touch sensor according to the present invention, in the forming of the protective layer, the protective layer may be formed to have a thickness of 0.5 μm or more and 10 μm or less.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 제1 영역의 최소 두께를 0.5㎛ 이상 1.5㎛ 이하로 형성하는 것을 특징으로 한다.In the method for manufacturing a foldable touch sensor according to the present invention, in the protective layer forming step, the minimum thickness of the first region is formed to be 0.5 μm or more and 1.5 μm or less.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 제2 영역의 두께를 1.5㎛ 이상 10㎛ 이하로 형성하는 것을 특징으로 한다.In the method for manufacturing a foldable touch sensor according to the present invention, in the forming of the protective layer, the thickness of the second region may be formed to be 1.5 μm or more and 10 μm or less.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 제1 영역이 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 갖도록 형성하는 것을 특징으로 한다.In the method of manufacturing a foldable touch sensor according to the present invention, in the forming of the protective layer, the first region is formed to have an inclined surface shape that becomes thinner as the first region approaches the folding line.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 제1 영역이 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 갖도록 형성하는 것을 특징으로 한다.In the method of manufacturing a foldable touch sensor according to the present invention, in the protective layer forming step, the first region is formed to have a curved shape that becomes thinner as the first region approaches the folding line.
본 발명에 따른 폴더블 터치 센서 제조방법에 있어서, 상기 보호층 형성단계에서는, 상기 제1 영역이 평면 형상을 갖도록 형성하는 것을 특징으로 한다.In the method of manufacturing a foldable touch sensor according to the present invention, in the forming of the protective layer, the first region may be formed to have a planar shape.
본 발명에 따르면, 내구성을 유지하는 동시에 폴더블 특성을 향상시킬 수 폴더블 터치 센서 및 그 제조방법이 제공되는 효과가 있다.According to the present invention, there is an effect that a foldable touch sensor and a method of manufacturing the same can be provided while maintaining durability.
도 1은 본 발명의 일 실시 예에 따른 폴더블 터치 센서의 전체적인 평면 형상을 개략적으로 나타낸 도면이고,1 is a view schematically showing the overall planar shape of a foldable touch sensor according to an embodiment of the present invention,
도 2는 도 1에 표시된 A 영역을 확대한 도면이고,FIG. 2 is an enlarged view of a region A shown in FIG. 1,
도 3a는 본 발명의 일 실시 예에 따른 폴더블 터치 센서의 단면도이고,3A is a cross-sectional view of a foldable touch sensor according to an embodiment of the present invention;
도 3b와 3c는 본 발명의 일 실시 예의 변형된 실시 예들에 따른 폴더블 터치 센서의 단면도들이고,3B and 3C are cross-sectional views of a foldable touch sensor according to modified embodiments of an embodiment of the present invention.
도 4는 본 발명의 일 실시 예에 따른 폴더블 터치 센서 제조방법의 공정 흐름도이고,4 is a flowchart illustrating a method of manufacturing a foldable touch sensor according to an exemplary embodiment of the present invention.
도 5 내지 도 9c는 본 발명의 일 실시 예에 따른 폴더블 터치 센서 제조방법의 공정 단면도들이다.5 to 9C are cross-sectional views illustrating a method of manufacturing a foldable touch sensor according to an exemplary embodiment.
본 명세서에 개시되어 있는 본 발명의 개념에 따른 실시 예들에 대해서 특정한 구조적 또는 기능적 설명은 단지 본 발명의 개념에 따른 실시 예들을 설명하기 위한 목적으로 예시된 것으로서, 본 발명의 개념에 따른 실시 예들은 다양한 형태들로 실시될 수 있으며 본 명세서에 설명된 실시 예들에 한정되지 않는다.Specific structural or functional descriptions of the embodiments according to the inventive concept disclosed herein are provided only for the purpose of describing the embodiments according to the inventive concept. It may be embodied in various forms and is not limited to the embodiments described herein.
본 발명의 개념에 따른 실시 예들은 다양한 변경들을 가할 수 있고 여러 가지 형태들을 가질 수 있으므로 실시 예들을 도면에 예시하고 본 명세서에서 상세하게 설명하고자 한다. 그러나, 이는 본 발명의 개념에 따른 실시 예들을 특정한 개시 형태들에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물, 또는 대체물을 포함한다.Embodiments according to the inventive concept may be variously modified and have various forms, so embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments in accordance with the concept of the invention to the specific forms disclosed, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.
제1 또는 제2 등의 용어는 다양한 구성 요소들을 설명하는데 사용될 수 있지만, 상기 구성 요소들은 상기 용어들에 의해 한정되어서는 안 된다. 상기 용어들은 하나의 구성 요소를 다른 구성 요소로부터 구별하는 목적으로만, 예컨대 본 발명의 개념에 따른 권리 범위로부터 벗어나지 않은 채, 제1 구성 요소는 제2 구성 요소로 명명될 수 있고 유사하게 제2구성 요소는 제1구성 요소로도 명명될 수 있다.Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example without departing from the scope of the rights according to the inventive concept, and the first component may be called a second component and similarly the second component. The component may also be referred to as the first component.
어떤 구성 요소가 다른 구성 요소에 "연결되어" 있다거나 "접속되어" 있다고 언급된 때에는, 그 다른 구성 요소에 직접적으로 연결되어 있거나 또는 접속되어 있을 수도 있지만, 중간에 다른 구성 요소가 존재할 수도 있다고 이해되어야 할 것이다. 반면에, 어떤 구성 요소가 다른 구성 요소에 "직접 연결되어" 있다거나 "직접 접속되어" 있다고 언급된 때에는 중간에 다른 구성 요소가 존재하지 않는 것으로 이해되어야 할 것이다. 구성 요소들 간의 관계를 설명하는 다른 표현들, 즉 "~사이에"와 "바로 ~사이에" 또는 "~에 이웃하는"과 "~에 직접 이웃하는" 등도 마찬가지로 해석되어야 한다.When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may exist in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle. Other expressions describing the relationship between components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring", should be interpreted as well.
본 명세서에서 사용한 용어는 단지 특정한 실시 예를 설명하기 위해 사용된 것으로서, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 명세서에서, "포함하다" 또는 "가지다" 등의 용어는 본 명세서에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부분품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성 요소, 부분품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described herein, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.
다르게 정의되지 않는 한, 기술적이거나 과학적인 용어를 포함해서 여기서 사용되는 모든 용어들은 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 일반적으로 이해되는 것과 동일한 의미를 나타낸다. 일반적으로 사용되는 사전에 정의되어 있는 것과 같은 용어들은 관련 기술의 문맥상 가지는 의미와 일치하는 의미를 갖는 것으로 해석되어야 하며, 본 명세서에서 명백하게 정의하지 않는 한, 이상적이거나 과도하게 형식적인 의미로 해석되지 않는다.Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.
이하에서는, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.
도 1은 본 발명의 일 실시 예에 따른 폴더블 터치 센서의 전체적인 평면 형상을 개략적으로 나타낸 도면이다.1 is a view schematically showing an overall planar shape of a foldable touch sensor according to an exemplary embodiment.
도 1을 참조하면, 본 발명의 일 실시 예에 따른 폴더블 터치 센서는 시각 정보가 표시되는지 여부를 기준으로 표시 영역과 비표시 영역으로 구분될 수 있다. 도 1에서, 비표시 영역에 구비되는 구성요소들에 대한 시인성 향상을 위해 비표시 영역을 실제보다 크게 표현하였음을 밝혀둔다.Referring to FIG. 1, a foldable touch sensor according to an exemplary embodiment may be divided into a display area and a non-display area based on whether visual information is displayed. In FIG. 1, the non-display area is represented to be larger than the actual one in order to improve visibility of the components included in the non-display area.
표시 영역은 터치 센서에 결합된 장치가 제공하는 화상이 표시되는 영역인 동시에 사용자로부터 입력되는 터치 신호를 정전용량방식으로 감지하기 위한 영역으로서, 이 표시 영역에는 서로 교차하는 방향으로 형성되는 다수의 감지 패턴들을 포함하는 구성요소들이 형성되어 있다.The display area is an area where an image provided by a device coupled to the touch sensor is displayed, and an area for capacitively detecting touch signals input from a user. The display area includes a plurality of sensing areas formed in directions crossing each other. Components comprising patterns are formed.
표시 영역의 외곽에 위치하는 비표시 영역에는 감지 패턴들과 전기적으로 연결되는 전극 패드들, 이 전극 패드들에 전기적으로 연결되는 감지 라인들, 이 감지 라인들에 전기적으로 연결되는 본딩 패드들이 형성되어 있다. 본딩 패드에는 표시 영역에서 감지된 터치 신호를 도시하지 않은 구동부로 전달하는 FPC(Flexible Printed Circuit)가 연결된다.In the non-display area outside the display area, electrode pads electrically connected to the sensing patterns, sense lines electrically connected to the electrode pads, and bonding pads electrically connected to the sensing lines are formed. have. The bonding pad is connected to a flexible printed circuit (FPC) that transmits a touch signal sensed in the display area to a driver (not shown).
도 2는 도 1에 표시된 A 영역을 확대한 도면이다.FIG. 2 is an enlarged view of a region A shown in FIG. 1.
도 2를 추가적으로 참조하면, 본 발명의 일 실시 예에 따른 폴더블 터치 센서를 구성하는 터치 센서층(40)의 평면 형상이 개시되어 있으며, 터치 센서층(40)은 제1 감지 패턴들(41), 제2 감지 패턴들(42), 절연층(45) 및 연결 패턴들(47)을 포함한다.Referring to FIG. 2, a planar shape of the touch sensor layer 40 constituting the foldable touch sensor according to the exemplary embodiment of the present invention is disclosed, and the touch sensor layer 40 includes the first sensing patterns 41. ), Second sensing patterns 42, an insulating layer 45, and connection patterns 47.
제1 감지 패턴들(41)은 서로 전기적으로 연결된 상태로 제1 방향을 따라 형성되어 있고, 제2 감지 패턴들(42)은 서로 전기적으로 분리된 상태로 제2 방향을 따라 형성되어 있으며, 제2 방향은 제1 방향과 교차하는 방향이다. 예를 들어, 제1 방향이 X 방향인 경우, 제2 방향은 Y 방향일 수 있다. 절연층(45)은 제1 감지 패턴들(41)과 제2 감지 패턴들(42) 사이에 형성되어 있으며, 제1 감지 패턴들(41)과 제2 감지 패턴들(42)을 전기적으로 절연시킨다. 연결 패턴들(47)은 인접하는 제2 감지 패턴들(42)을 전기적으로 연결시킨다.The first sensing patterns 41 are formed along the first direction while being electrically connected to each other, and the second sensing patterns 42 are formed along the second direction while being electrically separated from each other. The two directions are directions crossing with the first direction. For example, when the first direction is the X direction, the second direction may be the Y direction. The insulating layer 45 is formed between the first sensing patterns 41 and the second sensing patterns 42, and electrically insulates the first sensing patterns 41 and the second sensing patterns 42. Let's do it. The connection patterns 47 electrically connect adjacent second sensing patterns 42.
도 3a는 본 발명의 일 실시 예에 따른 폴더블 터치 센서의 단면도이다.3A is a cross-sectional view of a foldable touch sensor according to an exemplary embodiment.
도 3a를 참조하면, 본 발명의 일 실시 예에 따른 폴더블 터치 센서는 기재층(80), 터치 센서층(40) 및 보호층(51)을 포함한다.Referring to FIG. 3A, a foldable touch sensor according to an exemplary embodiment includes a base layer 80, a touch sensor layer 40, and a protective layer 51.
기재층(10)은 터치 센서의 구성요소들이 형성되는 기지로서, 경성 또는 연성 재질을 갖는 투명 물질일 수 있으며, 예를 들어, 연성 재질인 경우, 투명 광학 필름 또는 편광판일 수 있다.The base layer 10 is a substrate on which the components of the touch sensor are formed, and may be a transparent material having a hard or soft material. For example, the base layer 10 may be a transparent optical film or a polarizing plate.
투명 광학 필름은 투명성, 기계적 강도, 열 안정성이 우수한 필름이 사용될 수 있으며, 구체적인 예로는, 폴리에틸렌테레프탈레이트, 폴리에틸렌이소프탈레이트, 폴리에틸렌나프탈레이트, 폴리부틸렌테레프탈레이트 등의 폴리에스테르계 수지; 디아세틸셀룰로오스, 트리아세틸셀룰로오스 등의 셀룰로오스계 수지; 폴리카보네이트계 수지; 폴리메틸(메타)아크릴레이트, 폴리에틸(메타)아크릴레이트 등의 아크릴계 수지; 폴리스티렌, 아크릴로니트릴-스티렌 공중합체 등의 스티렌계 수지; 폴리에틸렌, 폴리프로필렌, 시클로계 또는 노보넨 구조를 갖는 폴리올레핀, 에틸렌-프로필렌 공중합체 등의 폴리올레핀계 수지; 염화비닐계 수지; 나일론, 방향족 폴리아미드 등의 아미드계 수지; 이미드계 수지; 폴리에테르술폰계 수지; 술폰계 수지; 폴리에테르에테르케톤계 수지; 황화 폴리페닐렌계 수지; 비닐알코올계 수지; 염화비닐리덴계 수지; 비닐부티랄계 수지; 알릴레이트계 수지; 폴리옥시메틸렌계 수지; 에폭시계 수지 등과 같은 열가소성 수지로 구성된 필름을 들 수 있으며, 상기 열가소성 수지의 블렌드물로 구성된 필름도 사용할 수 있다. 또한, (메타)아크릴계, 우레탄계, 아크릴우레탄계, 에폭시계, 실리콘계 등의 열경화성 수지 또는 자외선 경화형 수지로 된 필름을 이용할 수도 있다. 이와 같은 투명 광학 필름의 두께는 적절히 결정될 수 있지만, 일반적으로는 강도나 취급성 등의 작업성, 박층성 등을 고려하여, 1 ∼ 500㎛로 결정될 수 있다. 특히 1 ∼ 300㎛가 바람직하고, 5 ∼ 200㎛가 보다 바람직하다.As the transparent optical film, a film having excellent transparency, mechanical strength, and thermal stability may be used. Specific examples thereof include polyester-based resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether ether ketone resins; Sulfided polyphenylene resins; Vinyl alcohol-based resins; Vinylidene chloride-based resins; Vinyl butyral resin; Allyl resins; Polyoxymethylene resin; And films composed of thermoplastic resins such as epoxy resins, and the like, and films composed of blends of the above thermoplastic resins may also be used. Moreover, the film of thermosetting resin or ultraviolet curable resin, such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, and silicone type, can also be used. Although the thickness of such a transparent optical film can be suitably determined, generally, it can be determined to 1-500 micrometers in consideration of workability, thinness, etc., such as intensity | strength and handleability. 1-300 micrometers is especially preferable, and 5-200 micrometers is more preferable.
이러한 투명 광학 필름은 적절한 1종 이상의 첨가제가 함유된 것일 수도 있다. 첨가제로는, 예컨대 자외선흡수제, 산화방지제, 윤활제, 가소제, 이형제, 착색방지제, 난연제, 핵제, 대전방지제, 안료, 착색제 등을 들 수 있다. 투명 광학 필름은 필름의 일면 또는 양면에 하드코팅층, 반사방지층, 가스배리어층과 같은 다양한 기능성층을 포함하는 구조일 수 있으며, 기능성층은 전술한 것으로 한정되는 것은 아니며, 용도에 따라 다양한 기능성층을 포함할 수 있다.Such a transparent optical film may contain an appropriate one or more additives. As an additive, a ultraviolet absorber, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example. The transparent optical film may have a structure including various functional layers such as a hard coating layer, an antireflection layer, and a gas barrier layer on one or both surfaces of the film, and the functional layer is not limited to the above-described ones, and various functional layers may be formed depending on the purpose. It may include.
또한, 필요에 따라 투명 광학 필름은 표면 처리된 것일 수 있다. 이러한 표면 처리로는 플라즈마(plasma) 처리, 코로나(corona) 처리, 프라이머(primer) 처리 등의 건식 처리, 검화 처리를 포함하는 알칼리 처리 등의 화학 처리 등을 들 수 있다.In addition, the transparent optical film may be surface-treated as needed. Such surface treatments include, for example, plasma treatments, corona treatments, dry treatments such as primer treatments, and chemical treatments such as alkali treatments including saponification treatments.
또한, 투명 광학 필름은 등방성 필름, 위상차 필름 또는 보호 필름(Protective Film)일 수 있다.In addition, the transparent optical film may be an isotropic film, a retardation film or a protective film.
등방성 필름인 경우 면내 위상차(Ro, Ro=[(nx-ny)×d], nx, ny는 필름 평면 내의 주굴절률, d는 필름 두께이다.)가 40nm 이하이고, 15nm 이하가 바람직하며, 두께방향 위상차(Rth, Rth=[(nx+ny)/2-nz]×d, nx, ny는 필름 평면 내의 주굴절률, nz는 필름 두께 방향의 굴절률, d는 필름 두께이다.)가 -90nm ∼ +75nm 이며, 바람직하게는 -80nm ∼ +60nm, 특히 -70nm ∼ +45nm 가 바람직하다.In the case of an isotropic film, in-plane retardation (Ro, Ro = [(nx-ny) × d], nx, ny is the principal refractive index in the film plane, d is the film thickness) is 40 nm or less, preferably 15 nm or less, and the thickness Directional phase difference (Rth, Rth = [(nx + ny) / 2-nz] × d, nx, ny are principal refractive index in a film plane, nz is refractive index of a film thickness direction, d is film thickness.) -90nm- It is +75 nm, Preferably it is -80 nm-+60 nm, Especially -70 nm-+45 nm are preferable.
위상차 필름은 고분자 필름의 일축 연신, 이축 연신, 고분자 코팅, 액정 코팅의 방법으로 제조된 필름이며, 일반적으로 디스플레이의 시야각 보상, 색감 개선, 빛샘 개선, 색미 조절 등의 광학 특성 향상 및 조절을 위하여 사용된다. 위상차 필름의 종류에는 1/2 이나 1/4 등의 파장판, 양의 C플레이트, 음의 C플레이트, 양의 A플레이트, 음의 A플레이트, 이축성 파장판을 포함한다.Retardation film is a film produced by the method of uniaxial stretching, biaxial stretching, polymer coating, liquid crystal coating of a polymer film, and is generally used for improving and controlling optical properties such as viewing angle compensation, color improvement, light leakage, and color taste control of a display. do. Types of the retardation film include a wave plate such as 1/2 or 1/4, a positive C plate, a negative C plate, a positive A plate, a negative A plate, and a biaxial wave plate.
보호 필름은 고분자 수지로 이루어진 필름의 적어도 일면에 점착층을 포함하는 필름이거나 폴리프로필렌 등의 자가 점착성을 가진 필름일 수 있으며, 터치 센서 표면의 보호, 공정성 개선을 위하여 사용될 수 있다.The protective film may be a film including an adhesive layer on at least one surface of a film made of a polymer resin, or a film having self-adhesiveness such as polypropylene, and may be used for protecting the touch sensor surface and improving processability.
편광판은 표시 패널에 사용되는 공지의 것이 사용될 수 있다. 구체적으로는, 폴리비닐알코올 필름을 연신하여 요오드나 이색성 색소를 염색한 편광자의 적어도 일면에 보호층을 설치하여 이루어진 것, 액정을 배향하여 편광자의 성능을 갖도록 하여 만든 것, 투명필름에 폴리비닐알코올 등의 배향성 수지를 코팅하고 이것을 연신 및 염색하여 만든 것을 들 수 있으며, 이에 한정되는 것은 아니다.As a polarizing plate, a well-known thing used for a display panel can be used. Specifically, a polyvinyl alcohol film is drawn to form a protective layer on at least one surface of a polarizer dyed iodine or a dichroic dye, made by orienting the liquid crystal to have the performance of the polarizer, polyvinyl film on a transparent film And coating the alignment resin such as alcohol, stretching and dyeing the same, and the like, but are not limited thereto.
터치 센서층(40)은 기재층(10) 상에 형성되어 있으며, 사용자가 입력하는 터치 신호를 감지하기 위한 구성요소이다.The touch sensor layer 40 is formed on the base layer 10 and is a component for detecting a touch signal input by a user.
터치 센서층(40)을 구성하는 감지 패턴들은 적용되는 전자 기기의 요구에 따라 적절한 모양으로 형성될 수 있으며, 예를 들어, 터치 스크린 패널에 적용되는 경우, x 좌표를 감지하는 패턴과 y 좌표를 감지하는 패턴의 2종류 패턴들로 형성될 수 있으며, 이에 한정되는 것은 아니다.The sensing patterns constituting the touch sensor layer 40 may be formed in an appropriate shape according to the requirements of the electronic device to which the touch sensor layer 40 is applied. For example, when applied to a touch screen panel, the sensing pattern and the y coordinate may be detected. It may be formed of two types of patterns to detect, but is not limited thereto.
예를 들어, 터치 센서층(40)은 제1 감지 패턴들(41), 제2 감지 패턴들(42), 절연층(45) 및 연결 패턴들(47)을 포함할 수 있다.For example, the touch sensor layer 40 may include first sensing patterns 41, second sensing patterns 42, insulating layer 45, and connection patterns 47.
제1 감지 패턴들(41)은 서로 전기적으로 연결된 상태로 제1 방향을 따라 형성되어 있고, 제2 감지 패턴들(42)은 서로 전기적으로 분리된 상태로 제2 방향을 따라 형성되어 있으며, 제2 방향은 제1 방향과 교차하는 방향이다. 예를 들어, 제1 방향이 X 방향인 경우, 제2 방향은 Y 방향일 수 있다.The first sensing patterns 41 are formed along the first direction while being electrically connected to each other, and the second sensing patterns 42 are formed along the second direction while being electrically separated from each other. The two directions are directions crossing with the first direction. For example, when the first direction is the X direction, the second direction may be the Y direction.
절연층(45)은 제1 감지 패턴들(41)과 제2 감지 패턴들(42) 사이에 형성되어 있으며, 제1 감지 패턴들(41)과 제2 감지 패턴들(42)을 전기적으로 절연시킨다.The insulating layer 45 is formed between the first sensing patterns 41 and the second sensing patterns 42, and electrically insulates the first sensing patterns 41 and the second sensing patterns 42. Let's do it.
연결 패턴들(47)은 인접하는 제2 감지 패턴들(42)을 전기적으로 연결시킨다.The connection patterns 47 electrically connect adjacent second sensing patterns 42.
제1 감지 패턴들(41), 제2 감지 패턴들(42), 연결 패턴들(47)로는 투명 도전성 물질이라면 제한되지 않고 사용될 수 있으며, 예를 들어, 인듐틴옥사이드(ITO), 인듐징크옥사이드(IZO), 인듐징크틴옥사이드(IZTO), 알루미늄징크옥사이드(AZO), 갈륨징크옥사이드(GZO), 플로린틴옥사이드(FTO), 인듐틴옥사이드-은-인듐틴옥사이드(ITO-Ag-ITO), 인듐징크옥사이드-은-인듐징크옥사이드(IZO-Ag-IZO), 인듐징크틴옥사이드-은-인듐징크틴옥사이드(IZTO-Ag-IZTO) 및 알루미늄징크옥사이드-은-알루미늄징크옥사이드(AZO-Ag-AZO)로 이루어진 군에서 선택된 금속산화물류; 금(Au), 은(Ag), 구리(Cu), 몰리브덴(Mo) 및 APC로 이루어진 군에서 선택된 금속류; 금, 은, 구리 및 납으로 이루어진 군에서 선택된 금속의 나노와이어; 탄소나노튜브(CNT) 및 그래핀 (graphene)으로 이루어진 군에서 선택된 탄소계 물질류; 및 폴리(3,4-에틸렌디옥시티오펜)(PEDOT) 및 폴리아닐린(PANI)으로 이루어진 군에서 선택된 전도성 고분자 물질류에서 선택된 재료로 형성될 수 있으며, 이들은 단독 또는 2종 이상 혼합하여 사용할 수 있고, 바람직하게는 인듐틴옥사이드가 사용될 수 있다. 결정성 또는 비결정성 인듐틴옥사이드가 모두 사용 가능하다.The first sensing patterns 41, the second sensing patterns 42, and the connection patterns 47 may be used without limitation as long as it is a transparent conductive material. For example, indium tin oxide (ITO) and indium zinc oxide may be used. (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), florin tin oxide (FTO), indium tin oxide-silver-indium tin oxide (ITO-Ag-ITO), Indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc tin oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO) and aluminum zinc oxide-silver-aluminum zinc oxide (AZO-Ag- AZO) metal oxides selected from the group consisting of; Metals selected from the group consisting of gold (Au), silver (Ag), copper (Cu), molybdenum (Mo), and APC; Nanowires of metals selected from the group consisting of gold, silver, copper and lead; Carbon-based materials selected from the group consisting of carbon nanotubes (CNT) and graphene; And poly (3,4-ethylenedioxythiophene) (PEDOT) and polyaniline (PANI), and may be formed of a material selected from the group of conductive polymer materials, which may be used alone or in combination of two or more thereof. Preferably indium tin oxide may be used. Both crystalline or amorphous indium tin oxide can be used.
터치 센서층(40)의 두께는 특별히 한정되지 않으나, 터치 센서의 유연성을 고려할 때 가급적 박막인 것이 바람직하다. 예를 들면, 터치 센서층(40)의 두께는 0.01 내지 5㎛, 바람직하게는 0.03 내지 0.5㎛일 수 있다.The thickness of the touch sensor layer 40 is not particularly limited, but in consideration of flexibility of the touch sensor, the thickness of the touch sensor layer 40 is preferably as thin as possible. For example, the thickness of the touch sensor layer 40 may be 0.01 to 5 μm, preferably 0.03 to 0.5 μm.
예를 들어, 터치 센서층(40)을 구성하는 제1 감지 패턴들(41)과 제2 감지 패턴들(42)은 서로 독립적으로 3각형, 4각형, 5각형, 6각형 또는 7각형 이상의 다각형 패턴일 수 있다.For example, the first sensing patterns 41 and the second sensing patterns 42 constituting the touch sensor layer 40 may be trigonal, pentagonal, pentagonal, hexagonal, or more than seven polygons independently of each other. It may be a pattern.
또한, 예를 들어, 터치 센서층(40)은 규칙 패턴을 포함할 수 있다. 규칙 패턴이란, 패턴의 형태가 규칙성을 갖는 것을 의미한다. 예들 들어, 감지 패턴들은 서로 독립적으로 직사각형 또는 정사각형과 같은 메쉬 형태나, 육각형과 같은 형태의 패턴을 포함할 수 있다.Also, for example, the touch sensor layer 40 may include a rule pattern. A regular pattern means that the pattern form has regularity. For example, the sensing patterns may include, independently of each other, a mesh shape such as a rectangle or a square, or a pattern shape such as a hexagon.
또한, 예를 들어, 터치 센서층(40)은 불규칙 패턴을 포함할 수 있다. 불규칙 패턴이란 패턴의 형태가 규칙성을 갖지 아니한 것을 의미한다.Also, for example, the touch sensor layer 40 may include an irregular pattern. Irregular pattern means that the shape of the pattern does not have regularity.
또한, 예를 들어, 터치 센서층(40)을 구성하는 감지 패턴들이 금속 나노와이어, 탄소계 물질류, 고분자 물질류 등의 재료로 형성된 경우, 감지 패턴들은 망상 구조를 가질 수 있다. 감지 패턴들이 망상 구조를 갖는 경우, 서로 접촉하여 인접하는 패턴들에 순차적으로 신호가 전달되므로, 높은 감도를 갖는 패턴을 실현할 수 있다.In addition, for example, when the sensing patterns constituting the touch sensor layer 40 are formed of a material such as metal nanowires, carbon-based materials, polymer materials, or the like, the sensing patterns may have a network structure. When the sensing patterns have a network structure, signals are sequentially transmitted to adjacent patterns in contact with each other, thereby realizing a pattern having high sensitivity.
예를 들어, 터치 센서층(40)을 구성하는 감지 패턴들은 단일층 또는 복수의 층으로 형성될 수 있다.For example, the sensing patterns constituting the touch sensor layer 40 may be formed of a single layer or a plurality of layers.
제1 감지 패턴들(41)과 제2 감지 패턴들(42)을 절연시키는 절연층(45)의 소재로는 당 기술분야에 알려진 절연 소재가 제한 없이 사용될 수 있으며, 예를 들면 실리콘 산화물과 같은 금속 산화물이나 아크릴계 수지를 포함하는 감광성 수지 조성물 혹은 열경화성 수지 조성물이 사용될 수 있다. 또는 절연층(45)은 실리콘산화물(SiOx)등의 무기물을 사용하여 형성될 수 있으며, 이 경우 증착, 스퍼터링 등의 방법으로 형성될 수 있다.As the material of the insulating layer 45 that insulates the first sensing patterns 41 and the second sensing patterns 42, an insulating material known in the art may be used without limitation, for example, silicon oxide, A photosensitive resin composition or a thermosetting resin composition containing a metal oxide or an acrylic resin can be used. Alternatively, the insulating layer 45 may be formed using an inorganic material such as silicon oxide (SiOx), and in this case, the insulating layer 45 may be formed by deposition, sputtering, or the like.
보호층(51)은 터치 센서층(40) 상에 형성되어 있으며, 일 방향을 따라 형성된 제1 영역과 제1 영역보다 두꺼우며 제1 영역을 제외한 영역인 제2 영역으로 이루어진다.The protective layer 51 is formed on the touch sensor layer 40 and includes a first region formed along one direction and a second region that is thicker than the first region and excludes the first region.
보호층(51)은 절연성 소재로 형성되며, 터치 센서층(40)을 구성하는 제1 감지 패턴들(41), 제2 감지 패턴들(42), 절연층(45), 연결 패턴들(47)을 덮도록 형성되어, 터치 센서층(40)을 외부와 절연시키고, 보호하는 기능을 수행한다. 예를 들어, 보호층(51)은 단층 또는 2층 이상의 복수의 층으로 형성될 수 있다.The protective layer 51 is formed of an insulating material and includes the first sensing patterns 41, the second sensing patterns 42, the insulating layer 45, and the connection patterns 47 constituting the touch sensor layer 40. ) Is formed to cover, to insulate and protect the touch sensor layer 40 from the outside. For example, the protective layer 51 may be formed of a single layer or a plurality of layers of two or more layers.
예를 들어, 제1 영역이 형성되는 방향인 일 방향은 제1 감지 패턴들(41)이 형성되는 방향인 제1 방향 또는 제2 감지 패턴들(42)이 형성되는 방향인 제2 방향일 수 있으나, 반드시 이에 한정되지는 않는다.For example, one direction, which is a direction in which the first region is formed, may be a first direction in which the first sensing patterns 41 are formed or a second direction in which the second sensing patterns 42 are formed. However, it is not necessarily limited thereto.
일 방향을 따라 형성되는 제1 영역은 사용자가 터치 센서를 접을 경우 터치 센서가 접히는 라인인 폴딩 라인(folding line)이 된다.The first area formed along one direction becomes a folding line which is a line where the touch sensor is folded when the user folds the touch sensor.
본 발명의 일 실시 예에 따르면, 터치 센서의 폴더블 특성 확보를 위하여 보호층(51)의 두께를 전체적으로 줄이지 않고, 폴딩 라인이 되는 제1 영역의 두께(A)만을 일정 수준으로 줄이기 때문에, 터치 센서의 내구성 요구조건을 충족시키는 동시에, 폴더블 특성을 확보할 수 있다.According to an embodiment of the present disclosure, since the thickness of the protective layer 51 is not reduced as a whole to reduce the foldable characteristics of the touch sensor, only the thickness A of the first region serving as the folding line is reduced to a predetermined level. While meeting the durability requirements of the sensor, it is possible to ensure foldable characteristics.
예를 들어, 보호층(51)의 두께는 0.5㎛ 이상 10㎛ 이하인 것이 바람직하다. 보호층(51)의 두께가 0.5㎛ 미만이면, 보호층(51)의 내구성이 약해져서 충격 등과 같은 외부적인 요인들로부터 터치 센서층(40)을 구성하는 요소들을 충분히 보호할 수 없고, 보호층(51)의 두께가 10㎛를 초과하면, 터치 센서의 폴더블 특성이 저하되고 보호층(51)의 균일성이 크게 저하되어 터치 센서의 성능 품질이 저하된다.For example, the thickness of the protective layer 51 is preferably 0.5 µm or more and 10 µm or less. When the thickness of the protective layer 51 is less than 0.5 μm, the durability of the protective layer 51 is weakened, so that elements constituting the touch sensor layer 40 cannot be sufficiently protected from external factors such as impact, and the like. When the thickness of 51) exceeds 10 micrometers, the foldable characteristic of a touch sensor will fall, the uniformity of the protective layer 51 will fall largely, and the performance quality of a touch sensor will fall.
예를 들어, 제1 영역의 최소 두께(A)는 0.5㎛ 이상 1.5㎛ 이하인 것이 바람직하다. 제1 영역은 보호층(51)의 전체 영역 중에서 제2 영역을 제외한 영역으로서, 사용자가 터치 센서를 접을 경우 터치 센서가 접히는 라인인 폴딩 라인이 되는 영역이 되기 때문에, 제1 영역은 제2 영역에 비하여 얇게 구성된다. 제1 영역의 두께(A)가 0.5㎛ 미만이면, 보호층(51)의 제1 영역 즉, 폴딩 라인의 내구성이 약해져서 터치 센서층(40)을 구성하는 요소들을 충분히 보호할 수 없다. 즉, 제1 영역의 두께(A)가 0.5㎛ 미만이면, 사용자가 터치 센서를 접고 펴는 동작을 반복함에 따라, 제1 영역 및 그 하부의 터치 센서층(40)을 구성하는 요소들에 크랙(crack)이 발생하여 터치 센서의 내구성이 저하된다. 제1 영역의 두께(A)가 1.5㎛를 초과하면, 터치 센서의 제1 영역에서의 폴더블 특성이 저하된다.For example, it is preferable that the minimum thickness A of a 1st area | region is 0.5 micrometer or more and 1.5 micrometers or less. Since the first area is an area excluding the second area from the entire area of the protective layer 51, when the user folds the touch sensor, the first area becomes an folding line which is a folding line of the touch sensor. Compared to the thinner configuration. When the thickness A of the first region is less than 0.5 μm, durability of the first region of the protective layer 51, that is, the folding line, is weakened, so that elements constituting the touch sensor layer 40 may not be sufficiently protected. That is, when the thickness A of the first region is less than 0.5 μm, as the user repeats an operation of folding and unfolding the touch sensor, cracks may be formed in the elements constituting the first region and the touch sensor layer 40 thereunder. cracks) and the durability of the touch sensor is degraded. When thickness A of a 1st area | region exceeds 1.5 micrometers, the foldable characteristic in a 1st area | region of a touch sensor will fall.
예를 들어, 제2 영역의 두께는 1.5㎛ 이상 10㎛ 이하인 것이 바람직하다. 제2 영역의 두께(B)가 1.5㎛ 미만이면, 보호층(51)의 제2 영역의 내구성이 약해져서 충격 등과 같은 외부적인 요인들로부터 터치 센서층(40)을 구성하는 요소들을 충분히 보호할 수 없고, 제2 영역의 두께(B)가 10㎛를 초과하면, 터치 센서의 폴더블 특성이 저하되고 보호층(51)의 균일성이 크게 저하되어 터치 센서의 성능 품질이 저하된다.For example, it is preferable that the thickness of a 2nd area | region is 1.5 micrometers or more and 10 micrometers or less. When the thickness B of the second region is less than 1.5 µm, the durability of the second region of the protective layer 51 is weakened to sufficiently protect the elements constituting the touch sensor layer 40 from external factors such as impact. If the thickness B of the second region exceeds 10 µm, the foldable property of the touch sensor is lowered, the uniformity of the protective layer 51 is greatly lowered, and the performance quality of the touch sensor is lowered.
제1 영역과 제2 영역의 두께와 관련하여, 사용자가 터치 센서를 접을 경우 터치 센서가 접히는 라인인 폴딩 라인이 되는 제1 영역의 두께(A)를 제2 영역의 두께(B)보다 얇게 구성함으로써, 터치 센서의 내구성을 유지하는 동시에 폴더블 특성을 더욱 향상시킬 수 있다.Regarding the thickness of the first area and the second area, when the user folds the touch sensor, the thickness A of the first area, which is a folding line, which is a line where the touch sensor is folded, is made thinner than the thickness B of the second area. As a result, the foldable characteristics can be further improved while maintaining the durability of the touch sensor.
제1 영역의 구체적인 형상의 예들을 설명하면 다음과 같다.Examples of the specific shape of the first region are as follows.
하나의 예로, 도 3a에 개시된 바와 같이, 제1 영역은 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 가질 수 있다.As an example, as shown in FIG. 3A, the first region may have an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
다른 예로, 도 3b에 개시된 바와 같이, 제1 영역은 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 가질 수 있다.As another example, as illustrated in FIG. 3B, the first region may have a curved shape in which the thickness becomes thinner as it approaches the folding line.
또 다른 예로, 도 3c에 개시된 바와 같이, 제1 영역은 평면 형상을 가질 수 있다.As another example, as disclosed in FIG. 3C, the first region may have a planar shape.
도 3a, 도 3b, 도 3c는 보호층(51, 52, 53)의 제1 영역의 형상의 예들을 개시할 뿐이며, 이 예들 이외에도 제1 영역은 보호층(51, 52, 53)의 내구성과 폴더블 특성을 확보할 수 있는 다양한 형상들을 가질 수 있다.3A, 3B, and 3C only disclose examples of the shape of the first region of the protective layers 51, 52, 53, in addition to these examples the first region may be characterized by the durability of the protective layers 51, 52, 53. It may have various shapes to secure the foldable characteristics.
보호층(51, 52, 53)의 소재로는 당 기술분야에 알려진 절연 소재가 제한 없이 사용될 수 있으며, 예를 들면, 투명성, 유연성, 기계적 강도, 열안정성, 수분차폐성, 등방성 등에서 우수한 물질이 사용될 수 있다.As the material of the protective layers 51, 52, and 53, an insulating material known in the art may be used without limitation, and for example, an excellent material in transparency, flexibility, mechanical strength, thermal stability, moisture shielding, and isotropy may be used. Can be.
구체적인 예를 들면, 보호층(51, 52, 53)의 소재로는 유기 절연막이 적용될 수 있으며, 그 중에서도 폴리올(polyol) 및 멜라민(melamine) 경화제를 포함하는 경화성 조성물로 형성된 것일 수 있으나, 이에 한정되는 것은 아니다. For example, an organic insulating film may be applied as the material of the protective layers 51, 52, and 53, and may be formed of a curable composition including a polyol and a melamine curing agent. It doesn't happen.
폴리올의 구체적인 종류로는 폴리에테르 글리콜(polyether glycol) 유도체, 폴리에스테르 글리콜(polyester glycol) 유도체, 폴리카프로락톤 글리콜(polycaprolactone glycol) 유도체 등을 들 수 있으나, 이에 한정되는 것은 아니다.Specific examples of the polyol include, but are not limited to, polyether glycol derivatives, polyester glycol derivatives, polycaprolactone glycol derivatives, and the like.
멜라민 경화제의 구체적인 종류로는 메톡시 메틸 멜라민(methoxy methyl melamine) 유도체, 메틸 멜라민(methyl melamine) 유도체, 부틸 멜라민(butyl melamine) 유도체, 이소부톡시 멜라민(isobutoxy melamine) 유도체 및 부톡시 멜라민(butoxy melamine) 유도체 등을 들 수 있으나, 이에 한정되는 것은 아니다.Specific types of melamine curing agents include methoxy methyl melamine derivatives, methyl melamine derivatives, butyl melamine derivatives, isobutoxy melamine derivatives and butoxy melamine Derivatives and the like, but are not limited thereto.
다른 예로, 보호층(51, 52, 53)은 유무기 하이브리드 경화성 조성물로 형성될 수 있으며, 유기 화합물과 무기 화합물을 동시에 사용하는 경우, 박리시 발생하는 크랙(crack)을 저감할 수 있다는 점에서 바람직하다.As another example, the protective layers 51, 52, and 53 may be formed of an organic-inorganic hybrid curable composition, and when using an organic compound and an inorganic compound at the same time, cracks generated during peeling may be reduced. desirable.
유기 화합물로는 전술한 성분이 사용될 수 있고, 무기물로는 실리카계 나노 입자, 실리콘계 나노 입자, 유리 나노 섬유 등을 들 수 있으나, 이에 한정되는 것은 아니다.As the organic compound, the above-described components may be used, and the inorganic material may include silica-based nanoparticles, silicon-based nanoparticles, glass nanofibers, and the like, but is not limited thereto.
도 4는 본 발명의 일 실시 예에 따른 폴더블 터치 센서 제조방법의 공정 흐름도이고, 도 5 내지 도 9a는 본 발명의 일 실시 예에 따른 폴더블 터치 센서 제조방법의 공정 단면도들이다.4 is a flowchart illustrating a method of manufacturing a foldable touch sensor according to an embodiment of the present invention, and FIGS. 5 to 9A are cross-sectional views illustrating a method of manufacturing a foldable touch sensor according to an embodiment of the present invention.
도 4를 참조하면, 본 발명의 일 실시 예에 따른 폴더블 터치 센서 제조방법은 터치 센서층 형성단계(S10) 및 보호층 형성단계(S20)를 포함한다.Referring to FIG. 4, the method of manufacturing a foldable touch sensor according to an exemplary embodiment of the present invention includes a touch sensor layer forming step S10 and a protective layer forming step S20.
도 4 내지 도 7을 참조하면, 터치 센서층 형성단계(S10)에서는, 기재층(10) 상에 터치 센서층(40)을 형성하는 과정이 수행된다.4 to 7, in the touch sensor layer forming step S10, a process of forming the touch sensor layer 40 on the base layer 10 is performed.
터치 센서층(40)은 사용자가 입력하는 터치 신호를 감지하기 위한 구성요소이다.The touch sensor layer 40 is a component for detecting a touch signal input by a user.
예를 들어, 터치 센서층(40)을 구성하는 감지 패턴들은 적용되는 전자 기기의 요구에 따라 적절한 모양으로 형성될 수 있으며, 예를 들어, 터치 스크린 패널에 적용되는 경우, x 좌표를 감지하는 패턴과 y 좌표를 감지하는 패턴의 2종류 패턴들로 형성될 수 있으며, 이에 한정되는 것은 아니다.For example, the sensing patterns constituting the touch sensor layer 40 may be formed in an appropriate shape according to a request of an applied electronic device, and for example, when applied to a touch screen panel, a pattern for sensing x coordinates. And it may be formed of two kinds of patterns of the pattern for detecting the y coordinate, but is not limited thereto.
터치 센서층 형성단계(S20)의 구체적인 구성의 예를 설명한다.An example of a specific configuration of the touch sensor layer forming step S20 will be described.
먼저, 도 5에 개시된 바와 같이, 제1 방향을 따라 서로 연결된 제1 감지 패턴들(41)과 제1 방향과 교차하는 제2 방향을 따라 서로 분리된 제2 감지 패턴들(42)을 형성하는 과정이 수행된다. 예를 들어, 제1 방향이 X 방향인 경우, 제2 방향은 Y 방향일 수 있다.First, as shown in FIG. 5, the first sensing patterns 41 connected to each other along the first direction and the second sensing patterns 42 separated from each other along the second direction crossing the first direction are formed. The process is carried out. For example, when the first direction is the X direction, the second direction may be the Y direction.
다음으로, 도 6에 개시된 바와 같이, 제1 감지 패턴들(41)과 제2 감지 패턴들(42) 사이에 절연층(45)을 형성하는 과정이 수행된다.Next, as shown in FIG. 6, a process of forming the insulating layer 45 between the first sensing patterns 41 and the second sensing patterns 42 is performed.
절연층(45)은 제1 감지 패턴들(41)과 제2 감지 패턴들(42)을 전기적으로 절연시킨다.The insulating layer 45 electrically insulates the first sensing patterns 41 and the second sensing patterns 42.
다음으로, 도 7에 개시된 바와 같이, 인접하는 제2 감지 패턴들(42)을 전기적으로 연결하는 연결 패턴들(47)을 형성하는 과정이 수행된다.Next, as shown in FIG. 7, a process of forming connection patterns 47 for electrically connecting adjacent second sensing patterns 42 is performed.
제1 감지 패턴들(41), 제2 감지 패턴들(42), 연결 패턴들(47)로는 투명 도전성 물질이라면 제한되지 않고 사용될 수 있으며, 예를 들어, 인듐틴옥사이드(ITO), 인듐징크옥사이드(IZO), 인듐징크틴옥사이드(IZTO), 알루미늄징크옥사이드(AZO), 갈륨징크옥사이드(GZO), 플로린틴옥사이드(FTO), 인듐틴옥사이드-은-인듐틴옥사이드(ITO-Ag-ITO), 인듐징크옥사이드-은-인듐징크옥사이드(IZO-Ag-IZO), 인듐징크틴옥사이드-은-인듐징크틴옥사이드(IZTO-Ag-IZTO) 및 알루미늄징크옥사이드-은-알루미늄징크옥사이드(AZO-Ag-AZO)로 이루어진 군에서 선택된 금속산화물류; 금(Au), 은(Ag), 구리(Cu), 몰리브덴(Mo) 및 APC로 이루어진 군에서 선택된 금속류; 금, 은, 구리 및 납으로 이루어진 군에서 선택된 금속의 나노와이어; 탄소나노튜브(CNT) 및 그래핀(graphene)으로 이루어진 군에서 선택된 탄소계 물질류; 및 폴리(3,4-에틸렌디옥시티오펜)(PEDOT) 및 폴리아닐린(PANI)으로 이루어진 군에서 선택된 전도성 고분자 물질류에서 선택된 재료로 형성될 수 있으며, 이들은 단독 또는 2종 이상 혼합하여 사용할 수 있고, 바람직하게는 인듐틴옥사이드가 사용될 수 있다. 결정성 또는 비결정성 인듐틴옥사이드가 모두 사용 가능하다.The first sensing patterns 41, the second sensing patterns 42, and the connection patterns 47 may be used without limitation as long as it is a transparent conductive material. For example, indium tin oxide (ITO) and indium zinc oxide may be used. (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), florin tin oxide (FTO), indium tin oxide-silver-indium tin oxide (ITO-Ag-ITO), Indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc tin oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO) and aluminum zinc oxide-silver-aluminum zinc oxide (AZO-Ag- AZO) metal oxides selected from the group consisting of; Metals selected from the group consisting of gold (Au), silver (Ag), copper (Cu), molybdenum (Mo), and APC; Nanowires of metals selected from the group consisting of gold, silver, copper and lead; Carbon-based materials selected from the group consisting of carbon nanotubes (CNT) and graphene; And poly (3,4-ethylenedioxythiophene) (PEDOT) and polyaniline (PANI), and may be formed of a material selected from the group of conductive polymer materials, which may be used alone or in combination of two or more thereof. Preferably indium tin oxide may be used. Both crystalline or amorphous indium tin oxide can be used.
터치 센서층(40)의 두께는 특별히 한정되지 않으나, 터치 센서의 유연성을 고려할 때 가급적 박막인 것이 바람직하다. 예를 들면, 터치 센서층(40)의 두께는 0.01 내지 5㎛, 바람직하게는 0.03 내지 0.5㎛일 수 있다.The thickness of the touch sensor layer 40 is not particularly limited, but in consideration of flexibility of the touch sensor, the thickness of the touch sensor layer 40 is preferably as thin as possible. For example, the thickness of the touch sensor layer 40 may be 0.01 to 5 μm, preferably 0.03 to 0.5 μm.
예를 들어, 터치 센서층(40)을 구성하는 제1 감지 패턴들(41)과 제2 감지 패턴들(42)은 서로 독립적으로 3각형, 4각형, 5각형, 6각형 또는 7각형 이상의 다각형 패턴일 수 있다.For example, the first sensing patterns 41 and the second sensing patterns 42 constituting the touch sensor layer 40 may be trigonal, pentagonal, pentagonal, hexagonal, or more than seven polygons independently of each other. It may be a pattern.
또한, 예를 들어, 터치 센서층(40)은 규칙 패턴을 포함할 수 있다. 규칙 패턴이란, 패턴의 형태가 규칙성을 갖는 것을 의미한다. 예들 들어, 감지 패턴들은 서로 독립적으로 직사각형 또는 정사각형과 같은 메쉬 형태나, 육각형과 같은 형태의 패턴을 포함할 수 있다.Also, for example, the touch sensor layer 40 may include a rule pattern. A regular pattern means that the pattern form has regularity. For example, the sensing patterns may include, independently of each other, a mesh shape such as a rectangle or a square, or a pattern shape such as a hexagon.
또한, 예를 들어, 터치 센서층(40)은 불규칙 패턴을 포함할 수 있다. 불규칙 패턴이란 패턴의 형태가 규칙성을 갖지 아니한 것을 의미한다.Also, for example, the touch sensor layer 40 may include an irregular pattern. Irregular pattern means that the shape of the pattern does not have regularity.
또한, 예를 들어, 터치 센서층(40)을 구성하는 감지 패턴들이 금속 나노와이어, 탄소계 물질류, 고분자 물질류 등의 재료로 형성된 경우, 감지 패턴들은 망상 구조를 가질 수 있다. 감지 패턴들이 망상 구조를 갖는 경우, 서로 접촉하여 인접하는 패턴들에 순차적으로 신호가 전달되므로, 높은 감도를 갖는 패턴을 실현할 수 있다.In addition, for example, when the sensing patterns constituting the touch sensor layer 40 are formed of a material such as metal nanowires, carbon-based materials, polymer materials, or the like, the sensing patterns may have a network structure. When the sensing patterns have a network structure, signals are sequentially transmitted to adjacent patterns in contact with each other, thereby realizing a pattern having high sensitivity.
예를 들어, 터치 센서층(40)을 구성하는 감지 패턴들은 단일층 또는 복수의 층으로 형성될 수 있다.For example, the sensing patterns constituting the touch sensor layer 40 may be formed of a single layer or a plurality of layers.
제1 감지 패턴들(41)과 제2 감지 패턴들(42)을 절연시키는 절연층(45)의 소재로는 당 기술분야에 알려진 절연 소재가 제한 없이 사용될 수 있으며, 예를 들면 실리콘 산화물과 같은 금속 산화물이나 아크릴계 수지를 포함하는 감광성 수지 조성물 혹은 열경화성 수지 조성물이 사용될 수 있다. 또는 절연층(45)은 실리콘산화물(SiOx)등의 무기물을 사용하여 형성될 수 있으며, 이 경우 증착, 스퍼터링 등의 방법으로 형성될 수 있다.As the material of the insulating layer 45 that insulates the first sensing patterns 41 and the second sensing patterns 42, an insulating material known in the art may be used without limitation, for example, silicon oxide, A photosensitive resin composition or a thermosetting resin composition containing a metal oxide or an acrylic resin can be used. Alternatively, the insulating layer 45 may be formed using an inorganic material such as silicon oxide (SiOx), and in this case, the insulating layer 45 may be formed by deposition, sputtering, or the like.
도 8, 도 9a, 도 9b, 도 9c는 보호층 형성단계(S20)를 설명하기 위한 도면들이다.8, 9A, 9B, and 9C are diagrams for describing the protective layer forming step S20.
도 8을 추가적으로 참조하면, 터치 센서층(40)의 전면에 보호층 형성용 물질층(50)을 형성하고, 하프톤 마스크(halftone mask, M)를 보호층 형성용 물질층(50) 상에 배치한 상태에서, 하프톤 마스크(M)를 이용하여 보호층 형성용 물질층(50)을 차등적으로 노광하고 현상하는 과정이 수행된다. 하프톤 마스크(M)는 목표 패턴의 형상에 대응하는 광 투과율 패턴을 갖는다. 즉, 노광기로부터 출사된 광이 하프톤 마스크(M)에 도달하면, 하프톤 마스크(M)에 도달한 광은 하프톤 마스크(M)가 갖는 광 투과율 패턴에 대응하여 하프톤 마스크(M)를 투과하여 보호층 형성용 물질층(50)에 도달하기 때문에, 보호층 형성용 물질층(50)은 하프톤 마스크(M)의 광 투과율 패턴에 대응하여 노광된다.Referring to FIG. 8, a protective layer forming material layer 50 is formed on the entire surface of the touch sensor layer 40, and a halftone mask M is formed on the protective layer forming material layer 50. In the arranged state, a process of differentially exposing and developing the protective layer forming material layer 50 using the halftone mask M is performed. The halftone mask M has a light transmittance pattern corresponding to the shape of the target pattern. That is, when the light emitted from the exposure machine reaches the halftone mask M, the light reaching the halftone mask M corresponds to the light transmittance pattern of the halftone mask M. Since the light passes through the protective layer forming material layer 50, the protective layer forming material layer 50 is exposed in correspondence with the light transmittance pattern of the halftone mask M. FIG.
예를 들어, 최종적으로 형성되는 보호층의 두께를 고려하여, 보호층 형성용 물질층(50)은 10㎛ 이하의 두께로 형성될 수 있다.For example, in consideration of the thickness of the finally formed protective layer, the protective layer forming material layer 50 may be formed to a thickness of 10㎛ or less.
도 9a, 도 9b, 도 9c는 보호층 형성단계(S20)를 통하여 획득될 수 있는 보호층의 다양한 형상의 예들을 개시하고 있다.9A, 9B, and 9C illustrate examples of various shapes of the protective layer that may be obtained through the protective layer forming step S20.
하나의 예로, 도 9a에 개시된 바와 같이, 제1 영역은 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 가질 수 있다.As an example, as shown in FIG. 9A, the first region may have an inclined surface shape in which the thickness becomes thinner as it approaches the folding line.
다른 예로, 도 9b에 개시된 바와 같이, 제1 영역은 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 가질 수 있다.As another example, as shown in FIG. 9B, the first region may have a curved shape in which the thickness becomes thinner as it approaches the folding line.
또 다른 예로, 도 9c에 개시된 바와 같이, 제1 영역은 평면 형상을 가질 수 있다.As another example, as disclosed in FIG. 9C, the first region may have a planar shape.
도 9a, 도 9b, 도 9c는 보호층의 제1 영역의 형상의 예들을 개시할 뿐이며, 이 예들 이외에도 제1 영역은 보호층의 내구성과 폴더블 특성을 확보할 수 있는 다양한 형상들을 가질 수 있다.9A, 9B, and 9C only disclose examples of the shape of the first region of the protective layer. In addition to these examples, the first region may have various shapes to secure durability and foldable characteristics of the protective layer. .
이상에서 상세히 설명한 바와 같이 본 발명에 따르면, 내구성을 유지하는 동시에 폴더블 특성을 향상시킬 수 폴더블 터치 센서 및 그 제조방법이 제공되는 효과가 있다.As described in detail above, according to the present invention, a foldable touch sensor and a method of manufacturing the same may be provided while maintaining durability and improving foldable characteristics.
[부호의 설명][Description of the code]
10: 기재층10: base material layer
40: 터치 센서층40: touch sensor layer
41: 제1 감지 패턴들41: first sensing patterns
42: 제2 감지 패턴들42: second sensing patterns
45: 절연층45: insulation layer
47: 연결 패턴들47: connection patterns
50: 보호층 형성용 물질층50: material layer for forming a protective layer
51, 52, 53: 보호층51, 52, 53: protective layer
S10: 터치 센서층 형성단계S10: forming the touch sensor layer
S20: 보호층 형성단계S20: protective layer forming step
M: 하프톤 마스크M: Halftone Mask

Claims (14)

  1. 기재층;Base layer;
    상기 기재층 상에 형성된 터치 센서층; 및A touch sensor layer formed on the base layer; And
    상기 터치 센서층 상에 형성되어 있으며, 일 방향을 따라 형성된 제1 영역과 상기 제1 영역보다 두꺼우며 상기 제1 영역을 제외한 영역인 제2 영역으로 이루어진 보호층을 포함하는, 폴더블 터치 센서.And a protective layer formed on the touch sensor layer and including a first region formed along one direction and a second region that is thicker than the first region and is a region other than the first region.
  2. 제1항에 있어서,The method of claim 1,
    상기 보호층의 두께는 0.5㎛ 이상 10㎛ 이하인 것을 특징으로 하는, 폴더블 터치 센서.The protective layer has a thickness of 0.5 µm or more and 10 µm or less, wherein the foldable touch sensor.
  3. 제1항에 있어서,The method of claim 1,
    상기 제1 영역의 최소 두께는 0.5㎛ 이상 1.5㎛ 이하인 것을 특징으로 하는, 폴더블 터치 센서.The minimum thickness of the first region is 0.5 μm or more and 1.5 μm or less, foldable touch sensor.
  4. 제1항에 있어서,The method of claim 1,
    상기 제2 영역의 두께는 1.5㎛ 이상 10㎛ 이하인 것을 특징으로 하는, 폴더블 터치 센서.The thickness of the second region is 1.5 µm or more and 10 µm or less, wherein the foldable touch sensor.
  5. 제1항에 있어서,The method of claim 1,
    상기 제1 영역은 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 갖는 것을 특징으로 하는, 폴더블 터치 센서.And the first region has an inclined surface shape that becomes thinner as the first area is closer to a folding line.
  6. 제1항에 있어서,The method of claim 1,
    상기 제1 영역은 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 갖는 것을 특징으로 하는, 폴더블 터치 센서.The first region has a curved shape, the thickness of which becomes thinner closer to the folding line.
  7. 제1항에 있어서,The method of claim 1,
    상기 제1 영역은 평면 형상을 갖는 것을 특징으로 하는, 폴더블 터치 센서.And the first area has a planar shape.
  8. 기재층 상에 터치 센서층을 형성하는 터치 센서층 형성단계; 및Forming a touch sensor layer on the base layer; And
    하프톤 마스크(halftone mask)를 이용하여 상기 터치 센서층 상에 일 방향을 따르는 제1 영역과 상기 제1 영역보다 두꺼우며 상기 제1 영역을 제외한 영역인 제2 영역으로 이루어진 보호층을 형성하는 보호층 형성단계를 포함하는, 폴더블 터치 센서 제조방법.A protective layer formed on the touch sensor layer by using a halftone mask, a protective layer including a first region along one direction and a second region thicker than the first region and excluding the first region; Method of manufacturing a foldable touch sensor, comprising the step of forming a layer.
  9. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 보호층의 두께를 0.5㎛ 이상 10㎛ 이하로 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.Forming a thickness of the protective layer to 0.5㎛ 10㎛ less, foldable touch sensor manufacturing method.
  10. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 제1 영역의 최소 두께를 0.5㎛ 이상 1.5㎛ 이하로 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.Forming a minimum thickness of the first region to 0.5㎛ 1.5㎛, Method for manufacturing a foldable touch sensor.
  11. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 제2 영역의 두께를 1.5㎛ 이상 10㎛ 이하로 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.The thickness of the second region is formed to 1.5㎛ 10㎛, The foldable touch sensor manufacturing method.
  12. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 제1 영역이 폴딩 라인(folding line)에 근접할수록 두께가 얇아지는 경사면 형상을 갖도록 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.The first region is formed so as to have an inclined surface shape that becomes thinner closer to the folding line (folding line), foldable touch sensor manufacturing method.
  13. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 제1 영역이 폴딩 라인에 근접할수록 두께가 얇아지는 곡면 형상을 갖도록 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.The first region is formed to have a curved shape, the thickness becomes thinner closer to the folding line, foldable touch sensor manufacturing method.
  14. 제8항에 있어서,The method of claim 8,
    상기 보호층 형성단계에서는,In the protective layer forming step,
    상기 제1 영역이 평면 형상을 갖도록 형성하는 것을 특징으로 하는, 폴더블 터치 센서 제조방법.The first region is formed so as to have a planar shape, foldable touch sensor manufacturing method.
PCT/KR2016/015454 2016-02-16 2016-12-29 Foldable touch sensor and manufacturing method therefor WO2017142188A1 (en)

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