KR101767816B1 - Touch sensor based on self capacitance and manufacturing method thereof - Google Patents

Touch sensor based on self capacitance and manufacturing method thereof Download PDF

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KR101767816B1
KR101767816B1 KR1020160023153A KR20160023153A KR101767816B1 KR 101767816 B1 KR101767816 B1 KR 101767816B1 KR 1020160023153 A KR1020160023153 A KR 1020160023153A KR 20160023153 A KR20160023153 A KR 20160023153A KR 101767816 B1 KR101767816 B1 KR 101767816B1
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South Korea
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layer
dielectric sheet
electrode
electrode array
array layer
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KR1020160023153A
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Korean (ko)
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김종호
김민석
박연규
최재혁
이정태
이호영
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한국표준과학연구원
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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
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • H01L27/323—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Human Computer Interaction (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The present invention relates to a touch sensor based on self capacitance and a manufacturing method thereof. The touch sensor based on self capacitance according to an embodiment of the present invention includes a substrate, an electrode array layer which is formed on the lower side of the substrate and is formed according to a preset pattern, a dielectric sheet formed on the lower side of the electrode array layer, a display formed on the lower side of the dielectric sheet, and a control unit which is electrically connected to each electrode included in the electrode array layer, applies a voltage to each electrode, and detects the change amount of capacitance formed according to the applied voltage. The dielectric sheet includes a grounding electrode layer. Accordingly, the present invention can measure a touch position and a touch force (pressure).

Description

TECHNICAL FIELD [0001] The present invention relates to a self-capacitance-based touch sensor and a manufacturing method thereof,

The present invention relates to a self-capacitance-based touch sensor and a manufacturing method thereof.

In recent years, touch panel technology is deeply embedded in our everyday life, providing convenience in various aspects, and has become a key technology essential for everyday life. Generally, such a touch panel technology can be used for various electronic / communication devices such as a notebook, a personal digital assistant (PDA), a game machine, a smart phone, and navigation, and can be used for selecting or inputting a function desired by a user.

This touch panel technology can be largely implemented by a resistive film type and a capacitive type. The resistive type is configured such that the upper and lower electrode films are spaced apart by the spacers and can be brought into contact with each other by pressing. Therefore, when the upper plate on which the upper electrode film is formed is pressed by input means such as a finger or a pen, the upper and lower electrode films are energized, and the control unit recognizes the voltage change in accordance with the change in resistance value at that position, Method.

The capacitance type thin type is a transparent electrode film for sensing the capacitance, and the ITO (Indium Tin Oxide) is disposed horizontally and vertically to measure the electrostatic capacity. According to the method of measuring the capacitance, mutual capacitance method It is divided into self capacitance type. Specifically, the mutual capacitance method can measure the capacitance by applying a voltage to the ITO arranged laterally and measuring the voltage induced in the vertically arranged ITO. In the mutual capacitance type, the voltage is applied sequentially to M horizontal axes in the touch screen composed of M, N ITO in the horizontal and vertical directions, and the induced voltage is measured in N vertical axes, so that M x N Data can be generated. However, it takes a long time to measure.

Further, in the conventional mutual capacitance type touch-based pressure sensor, when the load is loaded, the electrode and the ground are close to each other, and since the amount of change of the capacitor is influenced by the size of the hand, it is impossible to obtain absolute magnitude of force.

On the other hand, in the self-capacitance method, M + N data is generated because voltage is simultaneously applied to M and N ITO in the horizontal and vertical directions to measure the electrostatic capacity, and measurement is performed very quickly because it is measured at one time. In addition, the self capacitance type has the advantage that the capacitance due to the touch is larger than the mutual capacitance, and therefore, the signal to noise ratio (SNR) is large, which is strong against the noise.

However, in the self-capacitance method, only M + N data are generated in the horizontal and vertical directions, causing a ghost phenomenon at the time of multi-touch, and multi-touch processing is difficult. In order to measure pressure or touch intensity at the touch position There is a difficulty.

Korean Patent Publication No. 10-2014-0017858

SUMMARY OF THE INVENTION The present invention provides a self-capacitance-based touch sensor capable of measuring a contact position and a contact force (pressure), and a manufacturing method thereof.

Specifically, there is provided a touch sensor capable of measuring a precise contact position and a contact force by forming an electrode layer for grounding on one side of a dielectric sheet or a display, and a manufacturing method thereof.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

According to a first aspect of the present invention, there is provided a self-capacitance-based touch sensor comprising: a substrate; an electrode array layer formed on a lower surface of the substrate and formed according to a predetermined pattern; A dielectric sheet formed on a lower portion of the array layer, a display formed on a lower portion of the dielectric sheet, and electrodes included in the electrode array layer, the plurality of electrodes being electrically connected to each of the electrodes to apply a voltage to each of the electrodes, And a control section for detecting a change amount, wherein the dielectric sheet includes a grounding electrode layer.

In this case, the dielectric sheet specifically includes a ground electrode layer, a first transparent film formed on the ground electrode layer, a dielectric layer formed on the first transparent film, and a second transparent film formed on the dielectric layer.

In addition, the display may be any one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper.

In addition, the self-capacitance-based touch sensor according to the second embodiment of the present invention includes a substrate, an electrode array layer formed under the substrate and formed according to a predetermined pattern, a dielectric sheet formed under the electrode array layer, And a control unit electrically connected to each of the electrodes included in the display and electrode array layers at a lower portion thereof for detecting a change in capacitance formed according to the applied voltage, The display includes an electrode layer for grounding.

At this time, the dielectric sheet specifically includes a first transparent film, a dielectric layer formed on the first transparent film, and a second transparent film formed on the dielectric layer.

In addition, in the second embodiment of the present invention, the display may be any one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper.

In this case, when the display according to the second embodiment of the present invention is an organic light emitting diode (OLED), the organic light emitting diode may be a front emission type, and the ground electrode layer may be a cathode of the organic light emitting diode ) Electrode.

Alternatively, when the display according to the second embodiment of the present invention is a liquid crystal display (LCD), the electrode layer for grounding is located above the liquid crystal layer included in the liquid crystal display.

According to another aspect of the present invention, there is provided a method of manufacturing a self-capacitance-based touch sensor, comprising: forming an electrode array layer on a substrate under a predetermined pattern; Fabricating a dielectric sheet including a grounding electrode layer; And bonding the display to the bottom of the dielectric sheet and bonding the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet. At this time, the step of fabricating the dielectric sheet may include the steps of: forming a ground electrode layer on the first protective film; Forming a first transparent film on the ground electrode layer; Forming a dielectric layer on top of the first transparent film; Forming a second transparent film on top of the dielectric layer, and forming a second protective film on top of the second transparent film, wherein the display is coupled to the bottom of the dielectric sheet, Wherein the step of bonding the substrate and the electrode array layer to the dielectric sheet comprises the steps of: removing the formed first and second protective films of the dielectric sheet; And forming a first adhesive film on top of the dielectric sheet and a second adhesive film on the bottom of the dielectric sheet.

Here, the display may be any one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper.

According to another aspect of the present invention, there is provided a method of manufacturing a self-capacitance-based touch sensor, comprising: forming an electrode array layer on a substrate in accordance with a predetermined pattern; Fabricating a dielectric sheet; And bonding the display and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet. At this time, the step of fabricating the dielectric sheet may include forming a first transparent film on the first protective film; Forming a dielectric layer on top of the first transparent film; Forming a second transparent film on the dielectric layer, and forming a second protective film on the second transparent film. The step of bonding the display to the bottom of the dielectric sheet and bonding the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer is in contact with the top of the dielectric sheet comprises the steps of forming the first protective film and the second protective film ; And forming a first adhesive film on top of the dielectric sheet and a second adhesive film on the bottom of the dielectric sheet.

Here, the display may be any one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper.

In the manufacturing method of the self-capacitance-based touch sensor according to the second embodiment of the present invention, when the display is an organic light-emitting diode (OLED), the organic light emitting diode may be a front emission type. At this time, the electrode layer for grounding is a cathode electrode of the organic light emitting diode.

Alternatively, in the method of manufacturing a touch sensor based on a self-capacitance based on the second embodiment of the present invention, when the display is a liquid crystal display (LCD), the liquid crystal layer included in the liquid crystal display is grounded And forming a usable electrode layer.

In addition, the self-capacitance-based touch sensor according to the third embodiment of the present invention includes a substrate, a first electrode array layer formed under the substrate and formed according to a predetermined pattern, Film, a second electrode array layer formed under the insulating film, a dielectric sheet formed under the second electrode array layer, a display and a first electrode array layer formed under the dielectric sheet, and an electrode included in the second electrode array layer And a controller for applying a voltage to each of the first electrode and the second electrode and detecting a change amount of a capacitance of each of the first electrode and the second electrode formed in accordance with the applied voltage, The dielectric sheet includes a grounding electrode layer and the control unit detects the position of the first object touched on the substrate based on the amount of change in the capacitance of each of the first electrodes, Second electrode on the basis of the amount of change in each of the capacitance, and detects the pressure of the first object.

In addition, the self-capacitance-based touch sensor according to the fourth embodiment of the present invention includes a substrate, a first electrode array layer formed at a lower portion of the substrate and formed according to a predetermined pattern, A second electrode array layer formed under the insulating film, a dielectric sheet formed under the second electrode array layer, and electrodes included in the first and second electrode array layers, respectively, And a control unit for applying a voltage to each of the first electrode and the second electrode and detecting a change amount of a capacitance of each of the first electrode and the second electrode formed according to the applied voltage, The sheet includes a grounding electrode layer, and the control unit detects the position of the first object touched on the substrate based on the amount of change in the capacitance of each of the first electrodes, On the basis of the amount of change in capacitance of each electrode, and detects the pressure of the first object.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a self-capacitance-based touch sensor capable of measuring a contact position and a contact force (pressure) And a manufacturing method thereof.

Specifically, it is possible to precisely measure the contact position and the contact force by forming a grounding electrode layer in one area of the dielectric sheet or the display.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

FIG. 1 is a block diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a first embodiment of the present invention.
Fig. 2 shows an example of the electrode array layer according to the embodiment of the present invention.
3 is a schematic view showing a dielectric sheet according to a first embodiment of the present invention.
4 is a diagram showing a schematic configuration of a touch sensor according to a second embodiment of the present invention.
5 is a configuration diagram of a dielectric sheet according to a second embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a self-capacitance-based touch sensor according to an embodiment of the present invention.
7 is a view illustrating a method of forming an electrode array layer according to an embodiment of the present invention.
FIG. 8 is a flowchart of a fabrication process for explaining a method of manufacturing the dielectric sheet according to the first embodiment of the present invention in detail.
9 is a view for explaining a manufacturing method of the self-capacitance touch sensor according to the first embodiment of the present invention.
10 is a flowchart of a fabrication process for explaining a method for fabricating a dielectric sheet according to a second embodiment of the present invention in detail.
11 is a configuration diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a third embodiment of the present invention.
FIG. 12 is a block diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware.

In this specification, some of the operations or functions described as being performed by the terminal or the device may be performed in the server connected to the terminal or the device instead. Similarly, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.

Hereinafter, a self-capacitance-based touch sensor and a manufacturing method according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a first embodiment of the present invention.

Fig. 2 shows an example of the electrode array layer according to the embodiment of the present invention.

1, a self-capacitance-based touch sensor 10A according to a first embodiment of the present invention includes a substrate 100, an electrode array layer 200, a dielectric sheet 300A, and a display 400A do.

The substrate 100 is a portion that is touched by a person's finger or an arbitrary object, and can be deformed by a pressure by a touch. The substrate 100 may include, for example, glass, a reinforced polymer substrate, and a polyimide (PI) film, but the present invention is not limited thereto.

The electrode array layer 200 is formed on the bottom of the substrate 100, and as shown in FIG. 2, a plurality of electrodes may be independently formed according to a predetermined pattern. At this time, each of the electrodes may be formed of indium tin oxide (ITO), carbon nanotube (CNT), graphene, metal nanowire, conductive polymer (PEDOT, poly (3,4-ethylenedioxythiophene ) Or a transparent conductive oxide (TCO).

Each of the electrodes formed in the electrode array layer 200 of FIG. 2 is patterned in a rectangular shape, but the pattern shape of the electrode is not limited to a rectangular shape, and may be changed according to the design of the touch sensor.

The dielectric sheet 300A is formed under the electrode array layer 200 and may be formed of materials having small rigidity that are deformed by an external force.

The dielectric sheet 300A is disposed between the display 400A and the electrode array layer 200 and can store a capacitance generated by a plurality of electrodes included in the electrode array layer 200. [ Thus, the dielectric layer 330 may be deformed by the pressure or load of the object being touched on the top of the substrate 100, which may cause a change in the capacitance formed inside the dielectric layer 330.

In particular, the dielectric sheet 300A according to the first embodiment of the present invention may include a grounding electrode layer to shield the touch sensor from electrical noise that may be generated by the display 400A.

Hereinafter, the dielectric sheet 300A according to the first embodiment of the present invention will be described in more detail with reference to Fig.

3 is a schematic view showing a dielectric sheet according to a first embodiment of the present invention.

Referring to FIG. 3, the dielectric sheet 300A according to the first embodiment of the present invention includes a first protective film 310A, a ground electrode layer 50 formed on the first protective film 310A, A first transparent film 320A formed on the upper part of the dielectric layer 50, a dielectric layer 330 formed on the upper part of the first transparent film 320A, a second transparent film 320B formed on the upper part of the dielectric layer 330, And a second protective film 310B formed on the upper portion of the film 320B. However, the dielectric sheet 300A according to an embodiment of the present invention is not limited to the above-described configuration.

That is, the dielectric sheet 300A according to the first embodiment of the present invention is formed by forming a first transparent film 320A and a second transparent film 320B on the upper and lower portions of the dielectric layer 340 around the dielectric layer 330 And includes a ground electrode layer 50 under the first transparent film 320A facing the display 100. [ The first protective film 310A and the second protective film 310B may be respectively formed on the lower portion of the ground electrode layer 50 and the upper portion of the second transparent film 320B.

In this case, the ground electrode layer 50 included in the dielectric sheet 300A according to the first embodiment of the present invention can be electrically connected to the circuit of the touch sensor 10A and the ground, thereby driving the display 400A The effect of the electrical noise generated by the AC component can be reduced. The ground electrode layer 50 may be formed of a metal such as aluminum (Al), gold (Au), platinum (Pt), nickel (Ni), graphene, silver nanowire, film, a metal grid, or a transparent electrode material. [0044] The present invention is not limited to the above embodiments and examples. At this time, the transparent electrode material may include any one of the electrode materials forming the plurality of electrodes described above.

The first protective film 310A, the second protective film 310B, the first transparent film 320A, and the second transparent film 320B, which constitute the dielectric sheet 300A according to the first embodiment of the present invention, May be, but is not limited to, a polyester (PET) film. The first protective film 310A and the second protective film 310B may be removed before and after the substrate 100, the electrode array 200, and the display 400A are coupled to the upper and lower portions of the dielectric sheet 300A. have.

Thereafter, the first adhesive film 20A and the second adhesive film 20B are formed on the upper and lower portions of the dielectric sheet from which the first protective film 301A and the second protective film 310B are removed, And the electrode array layer and the display at the bottom.

The dielectric layer 330 may be formed of a gel, a gel, a silicone, or a polydimethylsiloxane (PDMS) polymer. In addition, the dielectric layer 330 may be formed of OCA (Optically Clear Adhesive), which is a touch panel polymer.

Referring again to FIG. 1, the self-capacitance-based touch sensor according to the first embodiment of the present invention includes a display 400A under the dielectric sheet 300. FIG. The display 400A may be a light emitting diode (LED), a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT LCD), an organic light emitting diode (OLED), a flexible display, a 3D display, and an electronic paper. However, the present invention is not limited thereto.

Although not shown, the self-capacitance-based touch sensor 10A according to the first embodiment of the present invention is electrically connected to each of a plurality of electrodes of the above-described electrode array layer 200, A voltage applied to each of the electrodes, a capacitance formed according to the applied voltage, and a control unit detecting a change amount of the capacitance that changes as an arbitrary object is touched on the substrate 100.

Specifically, it is possible to accurately measure the touched position, pressure, and force of an object touched on the substrate 100 by detecting a change amount of a varying capacitance according to a load or a pressure of an object contacting the substrate 100 .

More specifically, each of the plurality of electrodes of the electrode array layer 200 is connected to an external ground (not shown), and the control unit measures the change in the capacitance value between each electrode and the ground, do. At this time, the external ground is connected in circuit with the grounding electrode layer 50 to provide more accurate measurement results.

The control unit may use a frequency-based technique to distinguish a capacitance change value due to an object contacting the substrate from a capacitance change value that is deformed due to an applied force. For example, if the object is a user's finger, the capacitance to the user's finger may change with frequency, and the capacitance due to the field in the dielectric sheet 300A may remain approximately constant for frequency.

Further, the dielectric constant of the dielectric layer included in the dielectric sheet 300A can be considered in relation to the frequency so that the change value of the capacitance with respect to frequency is small.

Hereinafter, a self-capacitance-based touch sensor 10B according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.

4 is a diagram showing a schematic configuration of a touch sensor according to a second embodiment of the present invention.

5 is a configuration diagram of a dielectric sheet according to a second embodiment of the present invention.

Referring to FIG. 4, a touch sensor 10B based on a self-capacitance according to a second embodiment of the present invention includes a substrate 100, an electrode array layer 200 formed under the substrate 100, A dielectric sheet 300B formed on the lower portion and a display 400B formed on the lower portion of the dielectric sheet.

At this time, since the substrate 100 and the electrode array layer 200 are formed in the same configuration as the touch sensor 10A according to the first embodiment of the present invention, detailed description will be omitted.

5, the dielectric sheet 300B formed on the lower portion of the electrode array layer 200 of the touch sensor 10B based on the self-capacitance based on the second embodiment of the present invention includes a first protective film 310A A first transparent film 320A formed on the first protective film 310A, a dielectric layer 330 formed on the first transparent film 320A, a second transparent film 320 formed on the dielectric layer 330, 320B and a second protective film 310B formed on the second transparent film 320B. The first protective film 310A and the second protective film 310B may be removed before the substrate 100, the electrode array 200, and the display 400B are coupled to the upper and lower portions of the dielectric sheet 300B. have.

The electrostatic capacitance based touch sensor 10B according to the second embodiment of the present invention is different from the touch sensor 10A according to the first embodiment of the present invention in that the ground electrode layer 50 is formed in the dielectric sheet 300B And may be included inside the display 400B.

In other words, the ground electrode layer 50 included in the display 400B can be electrically connected to the circuit of the touch sensor 10B and the ground.

In this case, when the display 400B included in the touch sensor 10B based on the self-capacitance based on the second embodiment of the present invention is a liquid crystal display (LCD), according to the second embodiment of the present invention The grounding front side layer 50 may be located above the liquid crystal layer of the liquid crystal display.

On the other hand, when the display 400B included in the self-capacitance-based touch sensor 10B according to the second embodiment of the present invention is an organic light-emitting diode (OLED), the organic light- Type, and the front layer 50 for grounding according to another embodiment of the present invention may be a cathode of the organic light emitting diode.

Hereinafter, a manufacturing method of the self-capacitance-based touch sensor according to the first embodiment of the present invention will be described in detail with reference to FIGS. 6 to 9. FIG.

 FIG. 6 is a flowchart illustrating a method of manufacturing a self-capacitance-based touch sensor according to an embodiment of the present invention, and FIG. 7 is a view illustrating a method of forming an electrode array layer according to an embodiment of the present invention .

FIG. 8 is a flowchart of a fabrication process for explaining a method of manufacturing the dielectric sheet according to the first embodiment of the present invention in detail.

9 is a view for explaining a manufacturing method of the self-capacitance touch sensor according to the first embodiment of the present invention.

Referring to FIG. 6, a method of fabricating a self-capacitance-based touch sensor 10A, 10B according to an embodiment of the present invention includes forming an electrode array layer on a substrate according to a predetermined pattern (S100); Fabricating a dielectric sheet (S200); (S300) of flip-joining the substrate and the electrode array layer so that the top of the dielectric sheet and the electrode array layer are in contact with each other, and a step S400 of bonding the display to the bottom of the dielectric sheet. However, the present invention is not limited to the above-described steps, and step S200 may be performed first, and then step S100 may be performed. Or step S100 and step S200 may be performed in parallel at the same time. Similarly, steps S300 and S400 may be performed after step S400 is performed first, or step S300 may be performed or both steps may be performed simultaneously.

That is, a method of combining the electrode array layer 200 and the display 400A with the above-described dielectric sheet 300A after the electrode array layer 200 and the dielectric sheets 300A and 300B are manufactured in the embodiment of the present invention ≪ / RTI >

Referring to FIG. 7, in step S100 of forming an electrode array layer according to a predetermined pattern on a substrate, a substrate 100 is prepared, and a plurality of electrodes are formed on the substrate 100 The electrode array layer 200 is formed.

At this time, in the method of forming the electrode array layer 200 on the substrate 100, a material for forming a plurality of electrodes is formed on the substrate 100, and an electrode is patterned according to a predetermined electrode shape and pattern .

Here, the method of patterning the electrode shape may be a photolithography or an e-beam lithography process. Alternatively, the electrode array layer 200 may be formed using a screen printing technique, and is not limited to the above-described manufacturing process.

Next, a dielectric sheet is manufactured (S200). The manufacturing process and the order of manufacturing the dielectric sheet (S200) may be different according to the first and second embodiments.

First, a method of manufacturing the dielectric sheet 300A according to the first embodiment of the present invention is to prepare the first protective film 310A as shown in FIGS. 8A and 8F, 1, the ground electrode layer 50, the first transparent film 320A, the dielectric layer 330, the second transparent film 320B and the second transparent film 320B are stacked in this order on the first protective film 310A .

 The first protective film 310A, the second protective film 310B, the transparent film 320A, and the second transparent film 320B, which constitute the dielectric sheet 300A according to the first embodiment of the present invention, May be a polyester (PET) film.

The dielectric layer 330 may be formed of any one of gel, gel, silicon, polydimethylsiloxane (PDMS), and optically clear adhesive (OCA), which is a touch panel polymer.

According to the manufacturing method of the self-capacitance-based touch sensor according to the first embodiment of the present invention, the first transparent film 320A and the second transparent film 320B are formed on the upper and lower portions of the dielectric layer 340, A transparent film 320B is formed and a ground electrode layer 50 is disposed under the first transparent film 320A facing the display 100 and the lower portion of the ground electrode layer 50 and the second transparent film 320B The dielectric sheet 300A including the first protective film 310A and the second protective film 310B can be manufactured.

A method of manufacturing the dielectric sheet 300B according to the second embodiment of the present invention will be described in detail later.

Thereafter, in the step S300 of flip bonding the substrate and the electrode array layer so that the electrode array layer and the top of the dielectric sheet are in contact with each other, as shown in Fig. 9 (a) The first adhesive film 20A and the second adhesive film 20B may be formed by removing the first protective film 310A and the second protective film 310B formed on the upper and lower portions of the dielectric sheet 300A . Subsequently, the substrate 100 and the electrode array layer 200 manufactured according to the manufacturing method of FIG. 7 are bonded to the top of the dielectric sheet 300A.

At this time, the substrate 100 and the electrode array layer 200 are formed such that the electrode array layer 200 including a plurality of electrodes is bonded to the dielectric sheet 300A by the first adhesive film 20A, To be brought into contact. Here, the first adhesive film 20A and the second adhesive film 20B may be OCA (Optically Clear Adhesive) polymer films, but are not limited thereto.

Finally, the touch sensor 10A according to the first embodiment can be manufactured by joining the display 400A with the second adhesive film 20B formed under the dielectric sheet 300A (S400).

The self-capacitance-based touch sensor 10A according to the first embodiment of the present invention manufactured in accordance with the above-described manufacturing method has the ground electrode layer 50 included in the dielectric sheet 300A and the circuit of the touch sensor 10A The grounding of the AC component can be electrically connected to reduce the effect of the electric noise generated in the AC component.

Hereinafter, a manufacturing method of the self-capacitance-based touch sensor 10B according to the second embodiment of the present invention will be described.

10 is a flowchart of a fabrication process for explaining a method for fabricating a dielectric sheet according to a second embodiment of the present invention in detail.

The manufacturing method of the self-capacitance-based touch sensor 10B in the second embodiment of the present invention is performed in the same manner as the manufacturing method of the touch sensor shown in Fig. That is, after the electrode array layer 200 and the dielectric sheet 300B are fabricated in the same manner as the self-capacitance-based touch sensor 10A according to the first embodiment of the present invention, (200) and the display (400B).

The method for forming the electrode array layer according to the second embodiment of the present invention in the step (S100) of forming the electrode array layer according to a predetermined pattern on the substrate is the same as the method described in the first embodiment of the present invention Therefore, detailed description will be omitted.

Next, in step S200 of manufacturing the dielectric sheet 300B, a method of manufacturing the dielectric sheet 300B according to the second embodiment of the present invention is shown in FIGS. 10A through 10E The first protective film 310A is prepared and a first transparent film 320A, a dielectric layer 330, a second transparent film 320B and a second transparent film 320B are formed on the first protective film 310A, ) May be laminated in this order. Similarly, the first protective film 310A and the second protective film 310B of the dielectric sheet 300B can be removed before the step S300 and the step S400 are performed.

The step S300 of flip-joining the substrate and the electrode array layer so that the top of the dielectric sheet and the electrode array layer are in contact with each other, and the step S400 of bonding the display to the bottom of the dielectric sheet, 1 embodiment.

10, the self-capacitance-based touch sensor 10B according to the second embodiment of the present invention is different from the touch sensor 10A according to the first embodiment of the present invention in that the dielectric sheet 300B, the step of forming the ground electrode layer 50 is not included.

In other words, the self-capacitance-based touch sensor 10B according to the second embodiment of the present invention includes the ground electrode layer 50 inside the display 400B, The ground electrode layer 50 can be electrically connected to the circuit ground of the touch sensor 10B.

As described above, according to the first and second embodiments of the present invention, the self-capacitance-based touch sensor includes the insulating electrode layer 50 inside the dielectric sheet 300A or the display 400B .

In this case, when the display of the self-capacitance-based touch sensor is a liquid crystal display (LCD), the grounding front layer 50 according to an embodiment of the present invention is formed in the dielectric sheet or the liquid crystal layer of the liquid crystal display As shown in FIG.

In the case where the display of the self-capacitance-based touch sensor is an organic light emitting diode (OLED) of a front emission type, the grounding front side layer 50 is disposed in the dielectric sheet or on the top of the liquid crystal layer of the liquid crystal display Lt; / RTI > At this time, when the ground electrode layer 50 is located above the liquid crystal layer of the liquid crystal display, the grounding front layer 50 may be a cathode of the organic light emitting diode.

On the other hand, when the display of the self-capacitance-based touch sensor is an organic light-emitting diode (OLED) of the backlight type, the electrode layer for grounding 50 may be formed in the dielectric sheet.

Accordingly, the self-capacitance-based touch sensor 10A, 10B according to the embodiment of the present invention can form a grounding electrode layer in one area of the dielectric sheet or the display, and can precisely measure the contact position and contact force .

11 is a configuration diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a third embodiment of the present invention.

11, the substrate 100, the first electrode array layer 200, the insulating film 500, the second electrode array layer 600, the dielectric sheet 300A, and the second electrode array layer 600 according to the third embodiment of the present invention, And a display 400A.

First, the substrate 100, the first electrode array layer 200, the dielectric sheet 300A, and the display 400A are fabricated using the self-capacitance-based touch sensor and the touch sensor according to the first embodiment of the present invention shown in Fig. same.

However, the self-capacitance-based touch sensor according to the third embodiment of the present invention includes the second electrode array layer 600 under the first electrode array layer 200, and the first electrode array layer 200, And the second electrode array layer 600 may be electrically insulated by the insulating film 500 shown in FIG.

Accordingly, the control unit (not shown) included in the self-capacitance-based touch sensor according to the third embodiment of the present invention applies a voltage to each of the first electrode and the second electrode, The change amount of the capacitance of each of the first electrode and the second electrode can be detected.

That is, the control unit can detect the position of the first object touched on the substrate based on the variation amount of the capacitance of each of the first electrodes, and can detect the position of the first object touched on the substrate based on the variation amount of the capacitance of each of the second electrodes Pressure can be detected.

Hereinafter, the self-capacitance-based touch sensor according to the third embodiment of the present invention will be described in more detail with reference to the self-capacitance-based touch sensor according to the first embodiment of the present invention.

In the case of the self-capacitance-based touch sensor according to the first embodiment of the present invention, when a voltage is applied to the electrode array layer 200, a capacitance is formed in the upper and lower directions of the electrode array layer. Here, the capacitance formed in the upper direction of the electrode array layer can be defined as C1, and the capacitance formed in the lower direction of the electrode array layer can be defined as C2. Thereafter, when an arbitrary first object is touched on the substrate 100, the value of the capacitance C1 varies depending on whether the first object is touched, and the dielectric layer in the dielectric sheet is deformed by the load or pressure of the first object. As a result, the value of the capacitance C2 changes. At this time, the change value of the capacitance C1 due to the contact is sufficient to detect contact, but the change value of the capacitance C2 depending on the pressure is difficult to detect because the difference is not large.

Accordingly, in order to solve the above-described problem and more accurately detect the touch position and the touch force (pressure) of the first object, the self-capacitance based touch sensor according to the third embodiment of the present invention includes a second electrode array layer (600).

In addition, by independently configuring each of the second electrodes included in the second electrode array layer 600, when multi-touch is generated on the substrate 100 by the second object, It is possible to distinguish the touch position and the touch force from each other more accurately.

In the case of the touch sensor of the self-capacitance type according to the third embodiment of the present invention, the second electrode array layer 600 may be formed together with the first electrode array layer 200 during the manufacturing process of the first electrode array layer 200, 300A). ≪ / RTI >

FIG. 12 is a block diagram schematically showing the configuration of a self-capacitance-based touch sensor according to a fourth embodiment of the present invention.

12, a self-capacitance-based touch sensor according to a fourth embodiment of the present invention includes a substrate 100, a first electrode array layer 200, a display 400A, an insulating film 500, An electrode array layer 600, and a dielectric sheet 300A.

Likewise, the substrate 100, the first electrode array layer 200, the dielectric sheet 300A, and the display 400A are similar to the first embodiment of the present invention shown in Fig. 1, .

The touch sensor of the fourth embodiment of the present invention includes a display 400A of the first electrode array layer 200 and a second electrode array layer 600 Is formed. At this time, since the method of forming the second electrode array layer 600 is the same as that of the first electrode array layer, a detailed description will be omitted.

Similarly, a control unit (not shown) included in the self-capacitance-based touch sensor according to the fourth embodiment of the present invention applies a voltage to each of the first electrode and the second electrode, The change amount of the capacitance of each of the first electrode and the second electrode can be detected.

That is, the control unit can detect the position of the first object touched on the substrate based on the variation amount of the capacitance of each of the first electrodes, and can detect the position of the first object touched on the substrate based on the variation amount of the capacitance of each of the second electrodes It is possible to detect the pressure.

Meanwhile, the controller according to the embodiment of the present invention refers to a hardware component such as software, a field programmable gate array (FPGA), or an application specific integrated circuit (ASIC), and performs predetermined roles. However, 'component' is not meant to be limited to software or hardware, and each component may be configured to be in an addressable storage medium and configured to play back one or more processors.

Thus, by way of example, an element may comprise components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, Routines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

In addition, the components and functions provided within the components may be combined into a smaller number of components or further separated into additional components.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10A, 10B: Self-capacitance based touch sensor
20A: first adhesive film, 20B: second adhesive film
50: ground electrode layer
100: substrate
200: electrode array layer
300A, 300B: dielectric sheet
310A: first protective film, 310B: second protective film
320A: first transparent film, 320B: second transparent film
400A, 400B: Display

Claims (31)

Board,
An electrode array layer formed under the substrate and formed according to a predetermined pattern,
A dielectric sheet formed under the electrode array layer,
A display formed below the dielectric sheet;
And a control unit electrically connected to each of the electrodes included in the electrode array layer to apply a voltage to each of the electrodes and to detect a change amount of a capacitance formed according to the applied voltage,
The dielectric sheet
A ground electrode layer,
A first transparent film formed on the ground electrode layer,
A dielectric layer formed on the first transparent film, and
And a second transparent film formed on the dielectric layer.
Self-capacitance based touch sensor. delete The method according to claim 1,
Wherein the display is one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper. Board,
An electrode array layer formed under the substrate and formed according to a predetermined pattern,
A dielectric sheet formed under the electrode array layer,
A display formed below the dielectric sheet;
And a control unit electrically connected to each of the electrodes included in the electrode array layer to apply a voltage to each of the electrodes and to detect a change amount of a capacitance formed according to the applied voltage,
The display
And a ground electrode layer,
The dielectric sheet
The first transparent film,
A dielectric layer formed on the first transparent film, and
And a second transparent film formed on the dielectric layer.
Self-capacitance based touch sensor. delete 5. The method of claim 4,
Wherein the display is one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper. The method according to claim 6,
Wherein the organic light emitting diode is a front emission type when the display is an organic light emitting diode (OLED)
Self-capacitance based touch sensor. 8. The method of claim 7,
The ground electrode layer
Wherein the organic light emitting diode is a cathode electrode of the organic light emitting diode.
Self-capacitance based touch sensor. The method according to claim 6,
When the display is a liquid crystal display (LCD)
The ground electrode layer
Wherein the liquid crystal layer is located above the liquid crystal layer included in the liquid crystal display.
Self-capacitance based touch sensor. The method according to claim 1 or 4,
The substrate
Wherein the substrate is a glass, a reinforced polymer substrate, or a polyimide (PI) film. The method according to claim 1 or 4,
The ground electrode layer
And electrically connected to a ground of an electrical circuit connected to each of said electrodes. The method according to claim 1 or 4,
The ground electrode layer
(ITO), carbon nanotubes (CNT), graphene, metal nanowires, conductive polymers (PEDOT, poly (3,4-ethylenedioxythiophene)), and transparent conductive oxides (TCO). ≪ / RTI > The method according to claim 1 or 4,
A first adhesive film for bonding the electrode array layer and the dielectric sheet, and
Further comprising a second adhesive film for bonding the dielectric sheet and the display,
Wherein the adhesive film is an OCA (Optically Clear Adhesive) polymer film.
Self-capacitance based touch sensor. The method according to claim 1 or 4,
The dielectric layer
Gel, gel, silicone, PDMS (Polydimethylsiloxane), and OCA (Optically Clear Adhesive) polymers.
Self-capacitance based touch sensor. The method according to claim 1 or 4,
The first transparent film and the second transparent film
Wherein the film is a polyethylene terephthalate (PET) film.
Self-capacitance based touch sensor. Forming an electrode array layer on the bottom of the substrate according to a predetermined pattern;
Fabricating a dielectric sheet including a grounding electrode layer; And
A display coupled to a lower portion of the dielectric sheet,
And bonding the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet,
The step of fabricating the dielectric sheet
Forming a ground electrode layer on the first protective film;
Forming a first transparent film on the ground electrode layer;
Forming a dielectric layer on top of the first transparent film;
Forming a second transparent film on top of the dielectric layer, and
And forming a second protective film on the second transparent film,
A display coupled to a lower portion of the dielectric sheet,
Wherein coupling the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet comprises:
Removing the first protective film and the second protective film formed on the dielectric sheet; And
Forming a first adhesive film on top of the dielectric sheet and forming a second adhesive film below the dielectric sheet.
A method of manufacturing a self - capacitance based touch sensor. 17. The method of claim 16,
Wherein the display is one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper. Forming an electrode array layer on the bottom of the substrate according to a predetermined pattern;
Fabricating a dielectric sheet; And
A display including a ground electrode layer is coupled to a lower portion of the dielectric sheet,
And bonding the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet,
The step of fabricating the dielectric sheet
Forming a first transparent film on the first protective film;
Forming a dielectric layer on top of the first transparent film;
Forming a second transparent film on top of the dielectric layer, and
And forming a second protective film on the second transparent film,
A display coupled to a lower portion of the dielectric sheet,
Wherein coupling the substrate and the electrode array layer to the dielectric sheet such that the electrode array layer abuts the top of the dielectric sheet comprises:
Removing the first protective film and the second protective film formed on the dielectric sheet; And
Forming a first adhesive film on top of the dielectric sheet and forming a second adhesive film below the dielectric sheet.
A method of manufacturing a self - capacitance based touch sensor. 19. The method of claim 18,
Wherein the display is one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper. 20. The method of claim 19,
Wherein the organic light emitting diode is a front emission type when the display is an organic light emitting diode (OLED)
A method of manufacturing a self - capacitance based touch sensor. 21. The method of claim 20,
The ground electrode layer
Wherein the organic light emitting diode is a cathode electrode of the organic light emitting diode.
A method of manufacturing a self - capacitance based touch sensor. 20. The method of claim 19,
When the display is a liquid crystal display (LCD)
And forming a ground electrode layer on top of the liquid crystal layer included in the liquid crystal display.
A method of manufacturing a self - capacitance based touch sensor. Board,
A first electrode array layer formed under the substrate and formed according to a predetermined pattern,
An insulating film formed under the first electrode array layer,
A second electrode array layer formed under the insulating film and formed according to a predetermined pattern,
A dielectric sheet formed below the second electrode array layer,
A display formed below the dielectric sheet;
The first electrode array layer and the second electrode array layer are electrically connected to each of the electrodes included in the first electrode array layer and the second electrode array layer to apply a voltage to each of the first electrode and the second electrode, And a controller for detecting a change amount of a capacitance of each of the first electrode and the second electrode,
The dielectric sheet
And a ground electrode layer,
The control unit
Detecting a position of a first object touched on the substrate based on a variation amount of capacitance of each of the first electrodes,
And detects a pressure of the first object based on a change amount of a capacitance of each of the second electrodes.
Self-capacitance based touch sensor. Board,
A first electrode array layer formed under the substrate and formed according to a predetermined pattern,
A display formed below the first electrode array layer,
An insulating film formed on a lower portion of the display,
A second electrode array layer formed under the insulating film and formed according to a predetermined pattern,
A dielectric sheet formed on a lower portion of the second electrode array layer,
The first electrode array layer and the second electrode array layer are electrically connected to each of the electrodes included in the first electrode array layer and the second electrode array layer to apply a voltage to each of the first electrode and the second electrode, And a controller for detecting a change amount of a capacitance of each of the first electrode and the second electrode,
The dielectric sheet
And a ground electrode layer,
The control unit
Detecting a position of a first object touched on the substrate based on a variation amount of capacitance of each of the first electrodes,
And detects a pressure of the first object based on a change amount of a capacitance of each of the second electrodes.
Self-capacitance based touch sensor. 25. The method according to claim 23 or 24,
Wherein the display is one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), and an electronic paper. 25. The method according to claim 23 or 24,
The substrate
Wherein the substrate is a glass, a reinforced polymer substrate, or a polyimide (PI) film. 25. The method according to claim 23 or 24,
The dielectric sheet
A ground electrode layer,
A first transparent film formed on the ground electrode layer,
A dielectric layer formed on the first transparent film, and
And a second transparent film formed on the dielectric layer.
Self-capacitance based touch sensor. 28. The method of claim 27,
The ground electrode layer
Wherein the first electrode and the second electrode are electrically connected to the ground of an electrical circuit connected to the first electrode and the second electrode, respectively. 28. The method of claim 27,
The ground electrode layer
(ITO), carbon nanotubes (CNT), graphene, metal nanowires, conductive polymers (PEDOT, poly (3,4-ethylenedioxythiophene)), and transparent conductive oxides (TCO). ≪ / RTI > 28. The method of claim 27,
The dielectric layer
Gel, gel, silicone, PDMS (Polydimethylsiloxane), and OCA (Optically Clear Adhesive) polymers.
Self-capacitance based touch sensor. 28. The method of claim 27,
The first transparent film and the second transparent film
Wherein the film is a polyethylene terephthalate (PET) film.
Self-capacitance based touch sensor.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130100072A1 (en) 2011-10-20 2013-04-25 Wintek Corporation Touch Panel
US20130278498A1 (en) 2012-04-18 2013-10-24 Samsung Electronics Co., Ltd. Pressure sensitive touch panel and portable terminal including the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130100072A1 (en) 2011-10-20 2013-04-25 Wintek Corporation Touch Panel
US20130278498A1 (en) 2012-04-18 2013-10-24 Samsung Electronics Co., Ltd. Pressure sensitive touch panel and portable terminal including the same

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