WO2016038940A1 - タッチパネル用導電フィルムおよびタッチパネル - Google Patents
タッチパネル用導電フィルムおよびタッチパネル Download PDFInfo
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- WO2016038940A1 WO2016038940A1 PCT/JP2015/064183 JP2015064183W WO2016038940A1 WO 2016038940 A1 WO2016038940 A1 WO 2016038940A1 JP 2015064183 W JP2015064183 W JP 2015064183W WO 2016038940 A1 WO2016038940 A1 WO 2016038940A1
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- WIPO (PCT)
- Prior art keywords
- external connection
- touch panel
- conductive film
- resin substrate
- connection terminals
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
Definitions
- the present invention relates to a conductive film for a touch panel and a touch panel, and particularly relates to a conductive film for a touch panel and a touch panel using a thin resin substrate.
- a touch panel In recent years, in various electronic devices such as portable information devices, touch panels that are used in combination with a display device such as a liquid crystal display device and perform an input operation to the electronic device by touching a screen have been widely used.
- a touch panel has a flexible circuit board connected to a conductive film for a touch panel and a drive control circuit for downsizing, and the conductive film for a touch panel and the flexible circuit board are connected via an anisotropic conductive film.
- electrical connection is performed by thermocompression bonding.
- it has been required to reduce the thickness of the touch panel and in order to reduce the thickness, studies have been made on using a thin resin substrate as the conductive film substrate for the touch panel.
- Patent Document 1 a first flexible circuit board is pressure-bonded to one surface side of a resin substrate to form a first bonding region, and then a second flexible circuit substrate is formed on the other surface side of the resin substrate.
- a touch panel is disclosed in which a second bonding region is formed by pressure bonding, and the second bonding region is positioned in the first bonding region in plan view.
- the present invention has been made to solve such problems, and it is an object of the present invention to provide a conductive film for a thinned touch panel and a thinned touch panel capable of reliably connecting to a flexible circuit board.
- the conductive film for a touch panel according to the present invention has a transparent resin substrate having a thickness of 40 ⁇ m or less, a plurality of detection electrodes formed on at least one surface of the resin substrate, and at least the resin substrate.
- a plurality of peripheral wirings formed on one surface and connected to the plurality of detection electrodes, respectively, and a plurality of external connection terminals formed on at least one surface of the resin substrate and connected to the plurality of peripheral wirings, respectively.
- the plurality of external connection terminals are arranged such that adjacent external connection terminals have a distance between terminals of 100 ⁇ m or more and 200 ⁇ m or less and are arranged at a pitch of 500 ⁇ m or less, and each have a terminal width greater than the distance between terminals.
- each terminal width of the plurality of external connection terminals is preferably not less than the minimum width obtained by adding 50 ⁇ m to the distance between terminals and not more than the maximum width obtained by adding 100 ⁇ m to the distance between terminals.
- the heat contraction rate with respect to the heat processing for 30 minutes at 130 degreeC is 0.20% or less for the electrically conductive film for touchscreens.
- an insulation having a thickness of 20 ⁇ m or more and 150 ⁇ m or less corresponding to a terminal formation region where a plurality of external connection terminals are formed on a surface opposite to a surface where a plurality of external connection terminals are formed on a resin substrate. It can further have a protective layer.
- the resin substrate is preferably made of polyethylene terephthalate or cycloolefin polymer.
- the plurality of detection electrodes preferably have a mesh shape with an aperture ratio of 90% or more.
- a plurality of detection electrodes, a plurality of peripheral wirings, and a plurality of external connection terminals can be formed on both surfaces of the resin substrate.
- a plurality of external connection terminals formed on one surface of the resin substrate and a plurality of external connection terminals formed on the other surface are the surfaces of the resin substrate of the external connection terminals that are closest to each other. It is preferable that the distance in the direction along the direction is 300 ⁇ m or more apart.
- a touch panel according to the present invention is disposed between the conductive film for a touch panel according to any of the above, a flexible circuit board on which a plurality of electrodes are formed, and the conductive film for the touch panel and the flexible circuit board.
- a plurality of external connection terminals of the film and an anisotropic conductive film for connecting a plurality of electrodes of the flexible circuit board are provided.
- a plurality of external connection terminals are arranged at a pitch of 500 ⁇ m or less and spaced apart from each other by a distance of 100 ⁇ m or more and 200 ⁇ m or less. Since the terminal width is equal to or greater than the distance, it is possible to reliably obtain electrical connection to the flexible circuit board.
- FIG. 1 It is a top view which shows the structure of the electrically conductive film for touchscreens which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the mesh pattern of a detection electrode. It is sectional drawing which shows the external connection terminal each formed on the surface of a resin substrate, and the back surface. It is a top view which shows the distance between terminals of an external connection terminal, a pitch, and terminal width. It is sectional drawing which shows the insulation protective layer of the conductive film for touchscreens which concerns on Embodiment 2. FIG. It is a top view which shows the insulation protective layer formed on the back surface of the resin substrate corresponding to the 1st external connection terminal.
- the conductive film for a touch panel according to the present invention has a transparent resin substrate having a thickness of 40 ⁇ m or less, a plurality of detection electrodes formed on at least one surface of the resin substrate, and at least the resin substrate.
- the plurality of external connection terminals are spaced apart from each other by a distance of 100 ⁇ m or more and 200 ⁇ m or less and are arranged at a pitch of 500 ⁇ m or less, and each has a terminal width that is greater than or equal to the distance between the terminals.
- FIG. 1 the structure of the electrically conductive film for touchscreens which concerns on Embodiment 1 of this invention is shown.
- This conductive film for a touch panel has a transparent resin substrate 1 having a thickness of 40 ⁇ m or less and having flexibility, and a plurality of first detection electrodes 2 are formed on the surface of the resin substrate 1 and resin.
- a plurality of second detection electrodes 3 are formed on the back surface of the substrate 1.
- a plurality of first peripheral wirings 4 corresponding to the plurality of first detection electrodes 2 are formed on the surface of the resin substrate 1, and a plurality of first peripheral wirings 4 connected to the plurality of first peripheral wirings 4 are formed.
- One external connection terminal 5 is formed on the edge of the resin substrate 1.
- a plurality of second peripheral wirings 6 corresponding to the plurality of second detection electrodes 3 are formed on the back surface of the resin substrate 1, and a plurality of second peripheral wirings 6 connected to the plurality of second peripheral wirings 6 are formed.
- Second external connection terminals 7 are formed on the edge of the resin substrate 1.
- the resin substrate 1 is a transparent substrate made of a flexible resin material.
- the resin substrate 1 is made of, for example, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP), polystyrene, ethylene vinyl acetate (EVA), cycloolefin polymer (COP), It can be composed of polyolefins such as cycloolefin copolymer (COC), vinyl resin, polycarbonate (PC), polyamide, polyimide, acrylic resin, and triacetyl cellulose (TAC).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PE polyethylene
- PP polypropylene
- EVA ethylene vinyl acetate
- COP cycloolefin polymer
- COC cycloolefin copolymer
- vinyl resin vinyl resin
- PC polycarbonate
- PC polyamide
- polyimide acrylic resin
- the resin substrate 1 from a polyethylene terephthalate or a cycloolefin polymer from a viewpoint of flexibility and an optical characteristic.
- “Transparent” means that the transmittance of light in the visible light region (wavelength 400 nm to 800 nm) is 80% or more.
- the film thickness of the resin substrate 1 is 40 ⁇ m or less, and the lower limit is not particularly limited, but is preferably 15 ⁇ m or more in consideration of the self-supporting property and handleability of the conductive film for touch panel.
- An undercoat layer may be provided for the purpose of preventing light leakage from the back surface during exposure.
- the undercoat layer may be a single layer or a multilayer.
- the conductive film for touch panel preferably has a thermal shrinkage rate of 0.40% or less, particularly preferably 0.20% or less with respect to heat treatment at 130 ° C. for 30 minutes.
- the conductive film for touch panel is prevented from being thermally deformed and formed on the front and back surfaces of the resin substrate 1.
- the first external connection terminal 5 and the second external connection terminal 7 can be prevented from being displaced and the alignment with respect to the flexible circuit board can be prevented from being displaced.
- the electrical connection can be made more reliably.
- the method for measuring the thermal shrinkage rate for heat treatment at 130 ° C. for 30 minutes is to heat the touch panel conductive film in a tension-free flat state for 30 minutes in a 130 ° C. dry oven, and in the touch panel conductive film before and after heating. It can be determined by measuring the dimensional change between any two points. The dimensional change measurement is performed using a pin gauge method, and the distance between any two points in the conductive film for a touch panel before heating is d1, and the distance between any two points in the conductive film for a touch panel after heating is d2.
- Thermal contraction rate
- the thermal shrinkage rate may be different in the TD direction (lateral direction) and the MD direction (machine flow direction). In that case, a value having a large thermal contraction rate is used as “thermal contraction rate for heat treatment at 130 ° C. for 30 minutes”.
- conductive films such as detection electrodes, peripheral wirings, external connection terminals, etc. are formed on the resin substrate 1. It can be obtained by previously heat-treating the resin substrate 1 before forming it.
- the heat treatment temperature is preferably 120 ° C. or higher and 160 ° C. or lower, and the heat treatment time is preferably 30 seconds to 10 minutes. In the heat treatment, it is preferable to apply tension to the resin substrate 1 in order to prevent the resin substrate 1 from warping.
- the tension is preferably 5 to 20 N.
- the preferred range of heat treatment temperature, time, and tension varies depending on the material and film thickness used for the resin substrate 1, so that the thermal shrinkage ratio for heat treatment at 130 ° C. for 30 minutes is 0.20% or less. It is preferable to design appropriately without being limited to the above range.
- the detection electrode is an electrode for detecting contact with the surface of the touch panel.
- the self-capacitance type electrode X and the electrode Y, or the mutual It corresponds to a capacitive drive electrode and detection electrode.
- the plurality of first detection electrodes 2 are formed in an active region (translucent area) on the touch panel, and extend in the first direction D1 and are orthogonal to the first direction D1. 2 are arranged in parallel in the direction D2.
- a first connector portion 8 is formed at one end of each first detection electrode 2.
- the plurality of second detection electrodes 3 are formed in the active region (translucent area), extend in the second direction D2, and are arranged in parallel in the first direction D1. Moreover, the 2nd connector part 9 is formed in the both ends of each 2nd detection electrode 3, respectively.
- the first detection electrode 2 and the second detection electrode are transparent electrodes, for example, transparent conductive metal oxides represented by indium tin oxide (ITO) and indium zinc oxide (IZO), PEDOT-PSS, and the like. Formed with transparent polymer conductive materials such as thiophene, transparent conductive films such as carbon nanotubes (CNT) and silver nanowires, or mesh-like conductive films formed by mesh patterns made of fine metal wires such as silver, aluminum, copper and gold can do.
- the first detection electrode 2 is formed by a mesh pattern made of the fine metal wires 10a
- the second detection electrode 3 is similarly formed by a mesh pattern made of the fine metal wires 10b. It is preferable that it is formed by. In this way, by forming the first detection electrode 2 and the second detection electrode 3 from a mesh pattern, for example, compared with a case where a flat detection electrode is formed using ITO, the first detection electrode 2 and the second detection electrode 3 are given to the resin substrate 1. Stress can be suppressed.
- transforms so that it may curl with the stress from the 1st detection electrode 2 and the 2nd detection electrode 3, and the conductive film for touch panels and a flexible circuit board are deform
- the first detection electrode 2 and the second detection electrode 3 are each formed from a mesh pattern having an aperture ratio of 90% or more so as to more reliably suppress the stress applied to the resin substrate 1. Furthermore, the first detection electrode 2 and the second detection electrode 3 are each formed from a mesh pattern having an aperture ratio of 90% or more, so that at the intersection of the first detection electrode 2 and the second detection electrode 3. It also has the effect of reducing parasitic capacitance. As the thickness of the resin substrate 1 is reduced, the parasitic capacitance at the intersection of the first detection electrode 2 and the second detection electrode 3 is increased, and the sensitivity of the touch panel is deteriorated. The problem can be effectively solved by forming the second detection electrodes 3 with mesh patterns each having an aperture ratio of 90% or more.
- the aperture ratio is the cell C (opening) surrounded by the thin metal wires 10a or 10b with respect to the surface area of the first detection electrode 2 or the second detection electrode 3 (area of the region where the detection electrode is formed). This is the area ratio and indicates the non-occupancy ratio of the thin metal wires in the first detection electrode 2 or the second detection electrode 3.
- the shape of the cell C may be a regular cell shape in which a single cell C is repeatedly formed, or the cell C may be a random shape. Further, it may be a semi-random shape imparted with a certain randomness in a regular cell shape.
- the cell shape can be a square, a rhombus, a regular hexagon, and the like, but a rhombus is preferable from the viewpoint of moire suppression, and the acute angle of the rhombus is particularly 20 degrees or more and 70 degrees or less. preferable.
- the cell pitch (distance between the centers of gravity of adjacent cells C) is preferably 50 ⁇ m or more and 500 ⁇ m or less.
- a dummy mesh insulated between the first detection electrode 2 and the second detection electrode 3 is provided between the plurality of first detection electrodes 2 and between the plurality of second detection electrodes 3. It is preferable to provide a pattern.
- the dummy mesh pattern is formed of a thin metal wire in the same manner as the detection electrode, and when the detection electrode is formed in a fixed cell shape, the dummy mesh pattern is formed in the same cell shape as the detection electrode. Further, the dummy mesh pattern has a disconnection portion having a length of 10 ⁇ m or more and 30 ⁇ m or less in the metal thin wire in order to provide insulation.
- the provision of the dummy mesh pattern has an effect of reducing the pattern appearance of the detection electrode and the mesh appearance of the fine metal wire when the conductive film for the touch panel is mounted on the touch panel.
- the mesh pattern of the first detection electrode 2 and the mesh pattern of the second detection electrode 3 are viewed from the upper surface side, the cells of the mesh pattern of the first detection electrode 2 as shown in FIG. It is preferable that the corner of the cell C of the mesh pattern of the second detection electrode 3 is arranged at the center of C.
- the aperture ratio of the mesh pattern formed by the combination of the mesh pattern of the first detection electrode 2 and the mesh pattern of the second detection electrode 3 is 90% or more. This is preferable in terms of preventing curling of the film.
- the width of the fine metal wire is preferably 0.5 ⁇ m or more and 5 ⁇ m or less.
- the metal thin line may be a straight line, a broken line, a curved line, or a wavy line shape.
- the film thickness of a metal fine wire is 3 micrometers or less from a viewpoint of the visibility from an oblique direction.
- a blackening layer may be provided on the visual side of the fine metal wire.
- the plurality of first peripheral wirings 4 are formed in an inactive region (frame portion), and one ends thereof are respectively connected to the plurality of first connector portions 8 formed on the plurality of first detection electrodes 2. In addition, the other end is connected to each of the plurality of first external connection terminals 5.
- the plurality of second peripheral wirings 6 are formed in an inactive region (frame portion) and have one end portions corresponding to the plurality of second connector portions 9 formed on the plurality of second detection electrodes 3, respectively. Is connected. At this time, the plurality of second peripheral wirings 6 are arranged separately on one end side and the other end side of the plurality of second detection electrodes 3 so as to sandwich the plurality of second detection electrodes 3, respectively.
- the second peripheral wiring 6 arranged on the side and the second peripheral wiring 6 arranged on the other end side are connected to a plurality of second connector portions 9 corresponding alternately in the first direction D1. ing. Further, the other end portions of the plurality of second peripheral wirings 6 are respectively connected to the plurality of second external connection terminals 7 correspondingly.
- the first detection electrode 2 and the first peripheral wiring 4 are connected via the first connector portion 8, but without forming the first connector portion 8, One detection electrode 2 and the first peripheral wiring 4 can be directly connected.
- the second detection electrode 3 and the second peripheral wiring 6 can be directly connected without forming the second connector portion 9.
- the first connector portion 8 and the second connector portion 9 are connected to the connection portion between the first detection electrode 2 and the first peripheral wiring 4 and between the second detection electrode 3 and the second peripheral wiring 6. Since there is an effect of improving electrical continuity at the connecting portion, it is preferable to provide it particularly when the materials of the detection electrode and the peripheral wiring are different.
- the material constituting the first peripheral wiring 4 and the second peripheral wiring 6 is preferably a metal, and metals such as silver, aluminum, copper, gold, molybdenum and chromium and alloys thereof can be used. It can be used as a single layer or a laminate, and can also be a laminate with a material constituting the detection electrode. Among these constituent materials, silver is preferably used from the viewpoint of resistance.
- the minimum line width and the minimum interval of the first peripheral wiring 4 and the second peripheral wiring 6 are preferably 10 ⁇ m or more and 50 ⁇ m or less. The smaller the minimum line width and the minimum interval of the first peripheral wiring 4 and the second peripheral wiring 6 are, the smaller the frame portion of the touch panel can be made. Short circuit between wirings can be prevented.
- the film thickness of the first peripheral wiring 4 and the second peripheral wiring 6 is preferably thick from the viewpoint of resistance value, but when the film thickness exceeds 50 ⁇ m, a cover member and a conductive film for touch panel described later are used.
- the film thickness is preferably 50 ⁇ m or less. If bubbles are generated in the bonded part, it causes peeling of the bonded part. Therefore, it is possible to suppress the peeling by suppressing the generation of bubbles.
- an insulating film made of urethane resin, acrylic resin, epoxy resin, or the like may be provided so as to cover the first peripheral wiring 4 and the second peripheral wiring 6. By providing the insulating film, migration, rust, and the like of the first peripheral wiring 4 and the second peripheral wiring 6 can be prevented.
- the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 are connected to a flexible circuit board for connection to a drive control circuit of the touch panel.
- a flexible circuit board for connection to a drive control circuit of the touch panel.
- FIG. Are formed in an inactive region (frame portion) and arranged along one edge portion 11 of the resin substrate 1 facing the first connector portion 8.
- the plurality of first external connection terminals 5 are arranged on the center of the edge 11 on the surface of the resin substrate 1, and the plurality of second external connection terminals 7 are made of resin.
- the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 are arranged on the back surface of the substrate 1 at a position sandwiching the central portion where the plurality of first external connection terminals 5 are disposed. It is preferable to arrange the resin substrate 1 so as not to overlap each other on the front surface side and the back surface side. Thereby, the connection of the flexible circuit board to the plurality of first external connection terminals 5 and the connection of the flexible circuit board to the plurality of second external connection terminals 7 can be easily performed.
- the plurality of first external connection terminals 5 are connected to the other end portions of the plurality of first peripheral wirings 4 extending from the plurality of first connector portions 8 respectively. Further, among the plurality of second external connection terminals 7, the plurality of second external connection terminals 7 arranged on one end side of the second detection electrode 3 are formed at one end of the second detection electrode 3. A plurality of second external connection terminals connected to the other end portions of the plurality of second peripheral wirings 6 extending from the second connector portion 9 and disposed on the other end side of the second detection electrode 3 7 are respectively connected to the other end portions of the plurality of second peripheral wirings 6 extending from the second connector portion 9 formed at the other end of the second detection electrode 3.
- the plurality of first external connection terminals 5 are spaced apart from each other by a distance d between terminals of 100 ⁇ m or more and 200 ⁇ m or less, and are arranged at a pitch P of 500 ⁇ m or less. It is formed to have a terminal width W.
- the plurality of second external connection terminals 7 are also spaced apart from each other by a terminal distance d of 100 ⁇ m or more and 200 ⁇ m or less and arranged at a pitch P of 500 ⁇ m or less, and have a terminal width W that is greater than or equal to the distance d between terminals. Is formed.
- the inter-terminal distance d is the shortest distance between adjacent external connection terminals
- the terminal width W is the maximum width of the external connection terminals in the direction in which a plurality of external connection terminals are arranged
- the pitch P is adjacent. It can be defined as the distance between the center lines of the external connection terminals.
- the center line of the external connection terminal is defined as a line extending in a direction orthogonal to the direction in which the external connection terminals are arranged from the midpoint of the maximum width of the external connection terminals in the direction in which the plurality of external connection terminals are arranged. To do.
- the first external connection terminal 5 and the second external connection terminal 7 are designed so that the terminal widths W are the same, the inter-terminal distances d are arranged at equal intervals, and the pitch P is also equal to each other. It is preferable to arrange them at regular intervals. However, in part of the first external connection terminal 5 and the second external connection terminal 7, the terminal width W, the inter-terminal distance d, or the pitch P may be different. The effect of the present invention can be obtained by designing so as to be included in the range.
- the layout of the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 is performed in the above range, so that the conductive film for touch panel is flexible circuit board through the anisotropic conductive film.
- thermocompression bonding the portion where pressure is not directly applied to the resin substrate 1 is reduced, so that the pressure applied to the resin substrate 1 can be made uniform in the surface direction.
- the conductive film for touch panel is thermocompression bonded to the flexible circuit board via the anisotropic conductive film, the deformation of the resin substrate 1 can be suppressed by transmitting pressure to the resin substrate 1 in a wide range.
- the deformation of the resin substrate 1 can be suppressed, and the deformation of the resin substrate 1 can prevent the electrical connection between the conductive film for touch panel and the flexible circuit board from being hindered.
- the formation range of the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 can be kept within a narrow range of the resin substrate 1. For this reason, even when the resin substrate 1 is deformed due to heat shrinkage or the like, it is possible to prevent the positions of the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 from being shifted and to the first flexible circuit board.
- the alignment of the external connection terminal 5 and the second external connection terminal 7 can be prevented from shifting, and the conductive film for touch panel can be reliably electrically connected to the flexible circuit board.
- a metal is preferable, and metals such as silver, aluminum, copper, gold, molybdenum, and chromium, and alloys thereof can be used. These can be used as a single layer or a laminate, and can also be a laminate with a material constituting the detection electrode. Among these constituent materials, silver and copper are preferably used from the viewpoint of electrical connectivity with the flexible circuit board.
- the film thickness of the first external connection terminal 5 and the second external connection terminal 7 is preferably 0.1 ⁇ m or more and 10 ⁇ m or less from the viewpoint of electrical connectivity with the flexible circuit board.
- the conductive particles contained in the anisotropic conductive film are not sufficiently crushed when the touch-panel conductive film is thermocompression bonded to the flexible circuit board, and the electrical connection with the flexible circuit board is reduced, resulting in a loss of 10 ⁇ m. Exceeding this is not preferable because the conductive particles contained in the anisotropic conductive film may break through the electrodes of the flexible circuit board and cause a decrease in electrical connection during thermocompression bonding.
- the length L of the 1st external connection terminal 5 shown in FIG. 4 and the 2nd external connection terminal 7 is 0.5 mm or more and 1.5 mm or less.
- the touch panel can be narrowed.
- the length L is 0.5 mm or more, the flexible circuit can be more reliably electrically connected.
- the shortest distance from the edge of the resin substrate 1 to the external connection terminal is preferably 0.02 mm or more and 1.0 mm or less.
- the first external connection terminal 5 and the second external connection terminal 7 and the first peripheral wiring 4 and the second peripheral wiring 6 described above are made of the same material and are simultaneously manufactured in the same process. It is preferred that
- each terminal width W of the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 is not less than the minimum width obtained by adding 50 ⁇ m to the inter-terminal distance d and 100 ⁇ m to the inter-terminal distance d. It is preferable that the width is not more than the maximum width of Accordingly, when the conductive film for touch panel is thermocompression bonded to the flexible circuit board via the anisotropic conductive film, the plurality of first external connection terminals 5 and the plurality of the first external connection terminals 5 are transmitted to the resin substrate 1 in a wide range.
- the formation range of the second external connection terminal 7 can be kept within a predetermined range, and displacement can be suppressed. For this reason, the conductive film for touch panels can be more reliably electrically connected to the flexible circuit board.
- the plurality of first external connection terminals 5 formed on the front surface of the resin substrate 1 and the plurality of second external connection terminals 7 formed on the back surface of the resin substrate 1 It is preferable that a distance D of 300 ⁇ m or more along the surface direction (a shortest distance between the first external connection terminal 5 and the second external connection terminal 7 in the surface direction of the resin substrate 1) is separated.
- the conductive film for touch panel is thermocompression bonded to the flexible circuit board via the anisotropic conductive film, the flexible circuit board connected to the plurality of first external connection terminals 5 extends from the front surface side to the back surface side of the resin substrate 1.
- the flexible circuit board connected to the plurality of second external connection terminals 7 is crimped from the rear surface side of the resin substrate 1 toward the front surface side. For this reason, when the distance D between the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 is less than 300 ⁇ m, the pressures facing each other are applied to the resin substrate 1 at a location close to each other, There is a possibility that a step is generated in the resin substrate 1. This level difference causes a positional shift between the first external connection terminal 5 and the second external connection terminal 7, and the resin substrate 1 is bonded in a process of pasting a cover member and a conductive film for a touch panel, which will be described later, or in a subsequent process. It causes breakage.
- the distance D between the plurality of first external connection terminals 5 and the plurality of second external connection terminals 7 is not particularly limited, but is preferably 3000 ⁇ m or less from the viewpoint of narrowing the frame.
- the dummy external connection terminal or the shield wiring is connected between the first external connection terminal 5 and the second external connection terminal 7 or outside the second external connection terminal 7.
- An external connection terminal may be provided.
- the dummy external connection terminal or the external connection terminal connected to the shield wiring is formed on either the front surface side where the first external connection terminal 5 is formed or the back surface side where the second external connection terminal 7 is formed.
- the external connection terminals including the dummy external connection terminals or the external connection terminals connected to the shield wiring are along the surface direction of the resin substrate 1 in the orthogonal plane orthogonal to the resin substrate 1. It is preferable to arrange them at a distance D of 300 ⁇ m or more.
- the manufacturing method of the conductive film for touch panels is not particularly limited.
- JP 2011-129501 A, JP 2013-149236 A, JP 2014-112512 A, JP 2011-513844 A, The manufacturing methods disclosed in Table 2014-511549, JP-A 2013-186632, JP-A 2014-88771 and the like can be used.
- a method for producing a conductive film in which a conductive pattern is formed of metallic silver by exposing and developing a photosensitive silver halide emulsion layer disclosed in JP 2012-6377 A is a process. Is preferable because it can be simplified.
- the first detection electrode 2, the first connector portion 8, the first peripheral wiring 4, and the first external connection terminal 5 are preferably made of the same metal material.
- the second detection electrode 3, the second connector portion 9, the second peripheral wiring 6, and the second external connection terminal 7 are made of the same metal material.
- the first detection electrode 2, the first connector portion 8, the first peripheral wiring 4, and the first external connection terminal 5 are made of the same metal material, so that the first detection electrode 2, Since the first connector portion 8, the first peripheral wiring 4 and the first external connection terminal 5 can be simultaneously manufactured in the same process, the alignment process and the like can be omitted, and the process can be simplified.
- the resin substrate 1 having a film thickness of 40 ⁇ m or less substrate deformation is likely to occur between processes, and there is a risk of misalignment in alignment. Therefore, these are simultaneously manufactured in the same process, thereby suppressing alignment misalignment. Is preferable.
- the second detection electrode 3, the second connector portion 9, the second peripheral wiring 6, and the second external connection terminal 7 are made of the same metal material. The two connector portions 9, the second peripheral wiring 6, and the second external connection terminal 7 can be simultaneously produced in the same process.
- the first connector portion 8 and the second connector portion 9 are not necessarily required and may not be provided depending on circumstances.
- the first detection electrode 2, the first connector portion 8, the first peripheral wiring 4 and the first external connection terminal 5 are made of the same metal material, and the second detection electrode 3 and the second connector portion 9.
- the second peripheral wiring 6 and the second external connection terminal 7 are made of silver or copper from the viewpoint of resistance value and visibility.
- the film thicknesses of the second connector portion 9, the second peripheral wiring 6, and the second external connection terminal 7 are preferably 0.1 ⁇ m or more and 3 ⁇ m or less.
- the first detection electrode 2, the first peripheral wiring 4 and the first external connection terminal 5 are disposed on the surface of the resin substrate 1, and on the back surface of the resin substrate 1.
- the second detection electrode 3, the second peripheral wiring 6, and the second external connection terminal 7 are disposed. If the detection electrode, the peripheral wiring, and the external connection terminal are disposed on at least one surface of the resin substrate 1.
- the first detection electrodes 2 are arranged in five rows and the second detection electrodes 3 are arranged in six rows.
- the number of the first detection electrodes 2 and the second detection electrodes The number is not limited to three.
- the resin substrate 1 has a thickness corresponding to the terminal formation region in which the plurality of first external connection terminals 5 are formed on the back surface opposite to the surface on which the plurality of first external connection terminals 5 are formed.
- An insulating protective layer having a thickness of 20 ⁇ m to 150 ⁇ m can be further formed.
- an insulating protective layer having a thickness of 20 ⁇ m to 150 ⁇ m can be formed.
- the deformation of the resin substrate 1 can be more effectively reduced when the conductive film for touch panel is thermocompression bonded to the flexible circuit board via the anisotropic conductive film. If the thickness of the insulating protective layer is less than 20 ⁇ m, the effect of preventing deformation of the resin substrate 1 during thermocompression bonding is poor, and if the thickness of the insulating protective layer exceeds 150 ⁇ m, the resin substrate 1 is warped by the insulating protective film, Since alignment at the time of thermocompression bonding becomes difficult, it is not preferable.
- the insulating protective layer is composed of two layers of the protective layer and the adhesive portion and the protective layer is composed of the same resin material as the resin substrate 1, the thermal expansion coefficient of the resin substrate 1 and the protective layer becomes the same. The deformation of the resin substrate 1 at the time of thermocompression bonding can be reduced more effectively.
- the first insulating protective layer 21 is formed on the back surface of the resin substrate 1 corresponding to the terminal formation region R1 where the first external connection terminals 5 are formed, and the resin substrate On the surface of 1, the second insulating protective layer 22 can be formed corresponding to the terminal formation region R ⁇ b> 2 where the second external connection terminal 7 is formed.
- the first insulating protective layer 21 and the second insulating protective layer 22 are for supporting and protecting the resin substrate 1 from deformation.
- the protective portion 23, the protective portion 23, and the resin substrate 1 are protected. It is preferable to comprise the adhesive portion 24 disposed between the two.
- the protection part 23 is preferably made of the same resin material as the resin substrate 1.
- the adhesive portion 24 contains an adhesive, which is an acrylic resin, urethane resin, silicone resin, rubber, ethylene-vinyl acetate copolymer (EVA), low density polyethylene (LDPE). ) And very low density polyethylene (VLDPE). It is preferable that the adhesion part 24 is comprised from the optical adhesive sheet (OCA; Optical Clear Adhesive) which has an acrylic resin adhesive.
- OCA optical adhesive sheet
- the adhesive part 24 can be used as an optical adhesive sheet (OCA), the optical adhesive sheet (OCA) can be bonded to another member by peeling off the protective part 23 in the step after the crimping process with the flexible circuit board. It can be used as an adhesive layer, and the process can be simplified and the number of members can be reduced.
- the first insulating protective layer 21 can be formed corresponding to a predetermined region including the terminal formation region R1 in which the first external connection terminal 5 is formed.
- the first external connection terminal 5 can be formed corresponding to only the terminal formation region R1.
- the first insulating protective layer 21 can also be formed over the entire region including other than the second external connection terminals 7.
- the first insulating protective layer 21 supports the resin substrate 1 and protects it from deformation, and also protects the second detection electrode 3, the second connector portion 9, and the second peripheral wiring 6. It is also preferable because it can serve as both.
- the second insulating protective layer 22 can be formed corresponding to a predetermined region including the terminal formation region R2 where the second external connection terminal 7 is formed.
- the second external connection terminal 7 can be formed corresponding to only the terminal formation region R2 in which the second external connection terminal 7 is formed.
- the second insulating protective layer 22 can also be formed over the entire region including other than the first external connection terminal 5.
- the second insulating protective layer 22 supports the resin substrate 1 and protects it from deformation, and also protects the first detection electrode 2, the first connector portion 8, and the first peripheral wiring 4. It is also preferable because it can serve as both.
- the second insulating protective layer 22 shown in FIG. 9 is preferably composed of two layers of the protective film 23 and the adhesive portion 24 as described above.
- the adhesive portion 24 is preferably composed of an optical pressure-sensitive adhesive sheet (OCA; Optical Clear Adhesive).
- OCA optical pressure-sensitive adhesive sheet
- OCA optical adhesive sheet
- the configuration of the bonding portion 24 and the bonding process can be simplified, which is preferable.
- the touch panel includes the above-described conductive film for a touch panel, a flexible circuit board on which a plurality of electrodes are formed, and a plurality of external connection terminals of the conductive film for the touch panel, which are disposed between the conductive film for the touch panel and the flexible circuit board. It can comprise from the anisotropic conductive film which connects the some electrode of a flexible circuit board.
- the touch panel includes a conductive film 31 for a touch panel, a flexible circuit board 32 arranged to face the conductive film 31 for a touch panel, and a conductive film 31 for the touch panel and the flexible circuit board 32. It can comprise from the anisotropic conductive film 33 arrange
- the flexible circuit board 32 is disposed in correspondence with the first flexible circuit board 32 a disposed in correspondence with the first external connection terminal 5 of the conductive film 31 for touch panel and the second external connection terminal 7. 2 flexible circuit boards 32b.
- the first flexible circuit board 32a includes a first flexible board 34a and a plurality of first electrodes 35a arranged on the surface of the first flexible board 34a facing the first external connection terminal 5.
- the second flexible circuit board 32b includes a second flexible board 34b and a plurality of second electrodes 35b arranged on the surface of the second flexible board 34b facing the second external connection terminal 7. .
- the anisotropic conductive film 33 bonds the touch-panel conductive film 31 and the first flexible circuit board 32a by thermocompression bonding, and the plurality of first external connection terminals 5 of the touch-panel conductive film 31 and the first flexible film.
- the plurality of first electrodes 35a of the circuit board 32a are electrically connected to each other, and the touch panel conductive film 31 and the second flexible circuit board 32b are bonded together, and the plurality of touch panel conductive films 31 are bonded.
- the second external connection terminal 7 and the plurality of second electrodes 35b of the second flexible circuit board 32b are electrically connected correspondingly.
- the first external connection terminals 5 of the conductive film 31 for the touch panel are arranged with a distance P between terminals of 100 ⁇ m or more and 200 ⁇ m or less and arranged with a pitch P of 500 ⁇ m or less, and each terminal width is more than the distance d between terminals. W.
- the second external connection terminals 7 are spaced apart from each other by a terminal distance d of 100 ⁇ m or more and 200 ⁇ m or less, and are arranged at a pitch P of 500 ⁇ m or less, and each have a terminal width W of the terminal distance d or more.
- the flexible circuit board 32 used in the present invention has an insulating flexible board and electrodes formed on the surface of the flexible board.
- a flexible circuit board 32 what is generally used for the connection with the conductive film 31 for touch panels in which the detection electrode and the external connection terminal were formed on the resin substrate can be used.
- the electrodes of the flexible circuit board 32 are connected to a touch panel drive control circuit.
- examples of the electrode of the flexible circuit board 32 include an electrode having a front-side connection terminal formed on one surface of the flexible substrate and a back-side connection terminal formed on the other surface.
- the flexible substrate in the present invention is not particularly limited as long as it has a desired insulating property.
- it can be composed of a flexible polyimide film having a thickness of about 25 ⁇ m.
- the thermal contraction rate at the pressure bonding temperature at the time of pressure bonding is the same as that of the conductive film 31 for touch panel, because the alignment shift at the time of pressure bonding can be prevented.
- the electrode of the flexible circuit board 32 is not particularly limited as long as it has desired conductivity, but is composed of a metal such as silver, aluminum, copper, gold, molybdenum, chromium, or an alloy thereof. It is possible to use a single layer or a laminate.
- the flexible circuit board 32 in the present invention has the above flexible board and electrodes, but may have other configurations as required. Examples of such other configurations include a wiring connected to the electrode and a protective layer formed so as to cover the wiring.
- a protective layer if it has insulation, it will not specifically limit, For example, what consists of a polyimide resin can be mentioned.
- the anisotropic conductive film 33 in the present invention is made of an anisotropic conductive material that exhibits adhesiveness and conductivity in the thickness direction by thermocompression bonding, and the external connection terminals of the conductive film 31 for touch panel and the flexible circuit board 32. It is for connecting an electrode.
- the anisotropic conductive film 33 preferably has a film-like configuration in which conductive particles are dispersed in an insulating binder.
- the conductive particles are not particularly limited as long as they have desired conductivity. However, metal particles such as gold, silver, and nickel, ceramics, plastics, or metal particles as the core and nickel or Examples thereof include metal-coated particles on which a metal film such as gold is formed.
- Examples of the material for the insulating binder include an epoxy resin.
- the particle diameter of the conductive particles is preferably 5 ⁇ m to 15 ⁇ m. By using the particle diameter of the conductive particles in this range, it is possible to effectively prevent a short circuit between the external connection terminals while securing a good electrical connection between the conductive film 31 for the touch panel and the flexible circuit board 32.
- the first electrode 35 a and the second electrode 35 b each have a thickness of 1 ⁇ 4 or more and 1 ⁇ 2 or less of the thickness of the resin substrate 1.
- the pressing amount of the flexible circuit board 32 against the conductive film 31 for the touch panel can be suppressed when the thermocompression bonding is performed. It can prevent that the electrical connection of the conductive film 31 for touchscreens and the flexible circuit board 32 is obstructed, deform
- the touch panel preferably further includes a cover member 36 that covers the entire surface of the conductive film 31 for the touch panel, and an adhesive portion 37 that bonds the cover member 36 and the resin substrate 1 together.
- the cover member 36 can be made of a glass material such as tempered glass, soda glass and sapphire, and a resin material such as polymethyl methacrylate (PMMA) and polycarbonate (PC).
- the cover member 36 can be easily provided by using the conductive film for a touch panel according to the second embodiment.
- the first flexible circuit board 32a and the second flexible circuit board 32b are thermocompression bonded to the touchscreen conductive film 31 through the anisotropic conductive film 33, respectively.
- the conductive film 31 for touch and the first flexible circuit board 32a are electrically connected, and the conductive film 31 for touch panel and the second flexible circuit board 32b are electrically connected.
- the adhesive portion 24 of the second insulating protective layer 22 has a thickness that is higher than the height position of the first flexible circuit board 32a attached to the front surface side of the conductive film 31 for touch panel.
- it can be formed with a thickness of 50 ⁇ m.
- the protective part 23 of the second insulating protective layer 22 can be formed with a thickness of 25 ⁇ m, and the first insulating protective layer 21 can be formed with an adhesive part 24 and a protective part 23 with a thickness of 25 ⁇ m.
- the second insulating protective layer 22 can expose the adhesive part 24 simply by peeling off the protective part 23. As shown in FIG. 13, the surface of the conductive film 31 for the touch panel is exposed via the exposed adhesive part 24.
- the cover member 36 can be adhered to the surface.
- the adhesion part 24 since the adhesion part 24 not only supports and protects the resin substrate 1 from deformation but also has a function of adhering, the protection part 24 is attached after the flexible circuit board 32 is attached to the conductive film 31 for touch panel.
- the cover member 36 can be easily adhered to the surface of the conductive film 31 for a touch panel simply by peeling off 23.
- the configuration of the touch panel is not limited to that illustrated in the present specification.
- an insulating film is provided only at the intersection of electrodes, and the touch panel is formed on the insulating film.
- the present invention can be applied to a touch panel having a configuration in which the detection electrode is provided only on one side of the substrate, such as a configuration in which the detection electrodes are provided on the one side of the substrate, such as a configuration in which the detection electrodes are provided on the one side of the substrate. Furthermore, the present invention can be applied to a touch panel configured by bonding two conductive films for a touch panel having detection electrodes, peripheral wirings, and external connection terminals only on one surface of the resin substrate 1.
- Example 1 A resin substrate was produced by subjecting the surface of a 38 ⁇ m thick sheet made of polyethylene terephthalate (PET), which was heat-treated at 150 ° C. for 3 minutes while applying a 20 N tension, to a hydrophilic treatment by corona discharge. Subsequently, on the surface of the resin substrate, a first detection electrode, a first peripheral wiring, and a first external connection terminal made of an Ag film having a thickness of 1 ⁇ m are formed by the pattern forming method shown below. A conductive film for a touch panel was produced.
- the first external connection terminals are arranged with a distance P between terminals of 100 ⁇ m and a pitch P of 300 ⁇ m, and each terminal width W is 200 ⁇ m.
- the first detection electrode is formed in a mesh shape (cell pitch: 300 ⁇ m) having a 98% aperture ratio made of rhombus shaped cells having a line width of 3 ⁇ m and an acute angle of 60 °, and the first peripheral wiring has a line width of
- the first external connection terminal was formed with a length L of 1 mm, and the minimum distance was 20 ⁇ m.
- the heat shrinkage rate was 0.16%.
- a flexible circuit board in which an electrode having a thickness of 12 ⁇ m made of copper was formed on the surface of a board made of polyimide having a thickness of 25 ⁇ m, an anisotropic conductive film (CP920AM-16AC: Dexerials) having a particle diameter of conductive particles of 10 ⁇ m ⁇ was used.
- a touch panel was manufactured by thermocompression bonding to a conductive film for a touch panel at 130 ° C. for 20 seconds via a product manufactured by Co., Ltd.
- ⁇ Pattern formation method> (Preparation of silver halide emulsion) To the following 1 liquid maintained at 38 ° C. and pH 4.5, an amount corresponding to 90% of each of the following 2 and 3 liquids was simultaneously added over 20 minutes while stirring to form 0.16 ⁇ m core particles. Subsequently, the following 4 and 5 solutions were added over 8 minutes, and the remaining 10% of the following 2 and 3 solutions were added over 2 minutes to grow to 0.21 ⁇ m. Further, 0.15 g of potassium iodide was added and ripened for 5 minutes to complete the grain formation.
- the emulsion after washing with water and desalting was adjusted to pH 6.4 and pAg 7.5, and gelatin 3.9 g, sodium benzenethiosulfonate 10 mg, sodium benzenethiosulfinate 3 mg, sodium thiosulfate 15 mg and chloroauric acid 10 mg were added.
- Chemical sensitization to obtain optimum sensitivity at 0 ° C. 100 mg of 1,3,3a, 7-tetraazaindene as stabilizer and 100 mg of proxel (trade name, manufactured by ICI Co., Ltd.) as preservative It was.
- the finally obtained emulsion contains 0.08 mol% of silver iodide, and the ratio of silver chlorobromide is 70 mol% of silver chloride and 30 mol% of silver bromide. It was a silver iodochlorobromide cubic grain emulsion having a coefficient of 9%.
- a gelatin layer having a thickness of 0.1 ⁇ m was provided as an undercoat layer on the surface of the resin substrate, and an antihalation layer containing a dye having an optical density of about 1.0 and decolorized by alkali of the developer was provided on the undercoat layer.
- the photosensitive layer forming composition was applied, and a gelatin layer having a thickness of 0.15 ⁇ m was further provided to obtain a resin substrate having a photosensitive layer formed on the surface.
- a resin substrate having a photosensitive layer formed on the surface is referred to as film A.
- the formed photosensitive layer had a silver amount of 6.0 g / m 2 and a gelatin amount of 1.0 g / m 2 .
- the film B was left to stand in a superheated steam bath at 120 ° C. for 130 seconds and subjected to heat treatment.
- the film after the heat treatment is referred to as film C.
- the film C was immersed for 120 seconds in an aqueous solution of proteolytic enzyme (Biolase AL-15FG manufactured by Nagase ChemteX Corporation) (proteolytic enzyme concentration: 0.5 mass%, liquid temperature: 40 ° C.).
- proteolytic enzyme concentration 0.5 mass%, liquid temperature: 40 ° C.
- the film C was taken out from the aqueous solution, immersed in warm water (liquid temperature: 50 ° C.) for 120 seconds and washed.
- the film after gelatin degradation is designated as film D.
- This film D is a conductive film for touch panels.
- Example 2 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged at a pitch P of 350 ⁇ m with a terminal distance d of 150 ⁇ m.
- Example 3 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged at a pitch P of 400 ⁇ m with a distance d between terminals of 200 ⁇ m.
- Example 4 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged with a distance d between the terminals of 150 ⁇ m and the respective terminal widths W were 150 ⁇ m.
- Example 5 A touch panel was produced in the same manner as in Example 4 except that the first external connection terminals were arranged at a pitch P of 400 ⁇ m and the respective terminal widths W were 250 ⁇ m.
- Example 6 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged at a pitch P of 500 ⁇ m with a terminal width d of 200 ⁇ m and each terminal width W was 300 ⁇ m.
- Example 7 The first detection electrode, the first peripheral wiring, and the first external connection terminal are respectively formed on the surface of the resin substrate by the pattern forming method described above, and the pattern shown above is formed on the back surface of the resin substrate.
- the second detection electrode, the second peripheral wiring, and the second external connection terminal formed of an Ag film having a thickness of 1 ⁇ m were formed, and the conductive film for a touch panel shown in FIG. 1 was produced.
- the first external connection terminals and the second external connection terminals formed on the front surface and the back surface of the resin substrate are separated by a distance d between terminals of 150 ⁇ m and arranged at a pitch P of 350 ⁇ m.
- the width W was 200 ⁇ m.
- first external connection terminal and the second external connection terminal were arranged with a terminal distance D of 100 ⁇ m along the surface direction of the resin substrate.
- the first detection electrode and the second detection electrode are formed in a mesh shape (cell pitch: 300 ⁇ m) having a line width of 3 ⁇ m and a rhomboid shaped cell having an acute angle of 60 ° and an aperture ratio of 98%.
- the peripheral wiring and the second peripheral wiring were formed with a line width of 20 ⁇ m and a minimum interval of 20 ⁇ m, and the first external connection terminal and the second external connection terminal were formed with a length L of 1 mm.
- the mesh pattern of the first detection electrode and the mesh pattern of the second detection electrode are arranged as shown in FIG.
- a mesh shape (cell pitch: 150 ⁇ m) with an aperture ratio of 96% was formed by combining the above.
- the heat shrinkage rate was 0.16%.
- a touch panel was manufactured by thermocompression bonding at 130 ° C. for 20 seconds through a 10 ⁇ m ⁇ anisotropic conductive film (CP920AM-16AC: manufactured by Dexerials Corporation).
- Example 8 A touch panel was produced in the same manner as in Example 7 except that the first external connection terminal and the second external connection terminal were arranged with a distance D between terminals of 300 ⁇ m along the surface direction of the resin substrate.
- Example 9 A touch panel was produced in the same manner as in Example 7 except that the first external connection terminal and the second external connection terminal were arranged with a distance D between terminals of 500 ⁇ m along the surface direction of the resin substrate.
- Example 10 A touch panel was produced in the same manner as in Example 1 except that the first insulating protective layer was formed on the back surface of the resin substrate of the conductive film for touch panel corresponding to the first detection electrode.
- the first insulating protective layer is composed of an adhesive part (using OCA # 8146-1 made by 3M) having a thickness of 25 ⁇ m made of an optical adhesive sheet (OCA) and a thickness of 25 ⁇ m made of polyethylene terephthalate. It consists of a protection part.
- Example 11 A touch panel was produced in the same manner as in Example 2 except that the first insulating protective layer was formed on the back surface of the resin substrate of the conductive film for the touch panel corresponding to the first detection electrode.
- the first insulating protective layer is composed of an adhesive part (using OCA # 8146-1 made by 3M) having a thickness of 25 ⁇ m made of an optical adhesive sheet (OCA) and a thickness of 25 ⁇ m made of polyethylene terephthalate. It consists of a protection part.
- Example 12 A first insulating protective layer is formed on the back surface of the resin film of the conductive film for touch panel corresponding to the first detection electrode, and a second corresponding to the second detection electrode is formed on the surface of the resin substrate.
- a touch panel was produced in the same manner as in Example 8 except that the insulating protective layer was formed.
- the first insulating protective layer is composed of an adhesive part (using OCA # 8146-1 made by 3M) having a thickness of 25 ⁇ m made of an optical adhesive sheet (OCA) and a thickness of 25 ⁇ m made of polyethylene terephthalate. It consists of a protection part.
- the second insulating protective layer has a 50 ⁇ m-thick adhesive portion made of optical adhesive sheet (OCA) (using 3M OCA # 8146-2) and a 25 ⁇ m-thick protective layer made of polyethylene terephthalate. It consists of parts.
- OCA optical adhesive sheet
- Example 13 Except for producing a resin substrate by applying corona discharge to the surface of a 40 ⁇ m thick sheet of cycloolefin polymer (COP) that was heat-treated at 130 ° C. for 3 minutes while applying a 15 N tension.
- a touch panel was produced in the same manner as in Example 1.
- the thermal contraction rate was 0.16%.
- Example 14 Except for producing a resin substrate by applying corona discharge to the surface of a 40 ⁇ m thick sheet of cycloolefin polymer (COP) that was heat-treated at 130 ° C. for 3 minutes while applying a 15 N tension.
- a touch panel was produced in the same manner as in Example 8.
- the thermal contraction rate was 0.16%.
- Example 15 40 ⁇ m thick sheet made of cycloolefin polymer (COP) subjected to heat treatment at 130 ° C. for 3 minutes while applying a tension of 15 N (heat shrinkage ratio for heat treatment at 130 ° C. for 30 minutes was 0.16%)
- a resin substrate is produced by subjecting the surface to a hydrophilic treatment by corona discharge, and a cycloolefin polymer (COP) having a thickness of 40 ⁇ m in the protective part of the first insulating protective layer and the protective part of the second insulating protective layer.
- a touch panel was produced in the same manner as in Example 12 except that was used.
- Example 1 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged at a pitch P of 250 ⁇ m with a terminal distance d of 50 ⁇ m.
- Example 2 A touch panel was produced in the same manner as in Example 1 except that the first external connection terminals were arranged at a pitch P of 450 ⁇ m with a terminal distance d of 250 ⁇ m.
- Example 3 A touch panel was produced in the same manner as in Example 4 except that the first external connection terminals were arranged at a pitch P of 250 ⁇ m and the terminal width W was set to 100 ⁇ m.
- Example 4 A touch panel was produced in the same manner as in Example 6 except that the first external connection terminals were arranged at a pitch P of 550 ⁇ m and the terminal width W was 350 ⁇ m.
- a continuity test between the first external connection terminal or the second external connection terminal connected to the flexible circuit board and the electrode of the flexible circuit board was performed by measuring resistance using a probe. Good electrical contact with the flexible circuit board electrode is maintained and the resistance value is 40 ⁇ or less is evaluated as A, and the electrical contact with the flexible circuit board electrode is maintained. The case where the resistance value was greater than 40 ⁇ and 60 ⁇ or less was evaluated as B, and the case where the resistance value was greater than 60 ⁇ and electrical contact with the electrodes of the flexible circuit board was not maintained and conduction was not achieved. .
- the results are shown in Tables 1 to 4 below.
- the first external connection terminals are separated from each other by a terminal distance d of 100 ⁇ m or more and 200 ⁇ m or less, and are arranged at a pitch P of 500 ⁇ m or less, and each has a terminal width W of the terminal distance d or more.
- a terminal distance d 100 ⁇ m or more and 200 ⁇ m or less
- a pitch P 500 ⁇ m or less
- the contact property of the first external connection terminals was greatly improved as compared with Comparative Example 1 in which the distance d between the first external connection terminals was less than 100 ⁇ m.
- the first external connection terminal of Comparative Example 1 was short-circuited between adjacent terminals.
- Examples 4 and 5 in which the first external connection terminals are spaced apart from each other by a terminal distance d of 100 ⁇ m or more and 200 ⁇ m or less and arranged at a pitch P of 500 ⁇ m or less, and each has a terminal width W of the terminal distance d or more.
- a terminal distance d 100 ⁇ m or more and 200 ⁇ m or less and arranged at a pitch P of 500 ⁇ m or less, and each has a terminal width W of the terminal distance d or more.
- the terminal width W of the first external connection terminal is less than the inter-terminal distance d, the deformation of the resin substrate is greatly suppressed and the contact property of the first external connection terminal is greatly improved. I found out.
- the first external connection terminals are separated from each other by a distance d between terminals of 100 ⁇ m or more and 200 ⁇ m or less and arranged at a pitch P of 500 ⁇ m or less, and each of the first external connection terminals has a terminal width W greater than the distance between terminals d.
- the pitch P of the external connection terminals is larger than 500 ⁇ m, both the alignment and contact properties of the first external connection terminals are greatly improved.
- the first external connection terminal and the second external connection terminal are separated by a terminal distance D of 300 ⁇ m or more along the surface direction of the resin substrate in an orthogonal plane orthogonal to the resin substrate. It was found that in Examples 8 and 9 arranged in this manner, the deformation of the resin substrate is suppressed as compared with Example 7 in which the inter-terminal distance D is less than 300 ⁇ m.
- Examples 13 to 15 using a sheet having a thickness of 40 ⁇ m made of cycloolefin polymer (COP) subjected to a heat treatment at 130 ° C. for 3 minutes while applying a tension of 15 N as a resin substrate were 20 N
- a 38 ⁇ m thick sheet made of polyethylene terephthalate (PET) which was heat-treated at 150 ° C. for 3 minutes while applying tension, was used as the resin substrate, deformation of the resin substrate, external connection It was found that good results were obtained in terms of terminal alignment and contactability of external connection terminals.
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Abstract
Description
また、タッチパネルを薄型化することが近年求められており、薄型化するには、タッチパネル用導電フィルムの基板に薄い樹脂基板を用いる検討が行われている。
例えば、特許文献1には、樹脂基板の一方の面側に第1のフレキシブル回路基板を圧着して第1接合領域を形成し、次いで、樹脂基板の他方の面側に第2のフレキシブル回路基板を圧着して第2接合領域を形成し、第2接合領域が、平面視上、第1接合領域内に第2接合領域が位置するよう構成したタッチパネルが開示されている。このように、第1のフレキシブル回路基板と第2のフレキシブル回路基板を重なるように配置することにより、樹脂基板の両面にフレキシブル回路基板を熱圧着する際に樹脂基板の一方の面側と他方の面側で圧力が加わる位置にずれが生じることを抑制することができる。このため、圧力位置のずれに起因してタッチパネル用導電フィルムに段差が生じず、タッチパネル用導電フィルムとフレキシブル回路基板との良好な電気的な接続を得ることができる。
また、タッチパネル用導電フィルムは、130℃で30分間の熱処理に対する熱収縮率が0.20%以下であることが好ましい。
また、複数の検出電極は、開口率90%以上のメッシュ形状を有することが好ましい。
また、樹脂基板の一方の面上に形成された複数の外部接続端子と他方の面上に形成された複数の外部接続端子は、互いに最も近い位置に存在する外部接続端子同士の樹脂基板の面方向に沿った方向の距離で300μm以上の距離を隔てて配置されていることが好ましい。
この発明に係るタッチパネル用導電フィルムは、厚さが40μm以下で且つ可撓性を有する透明な樹脂基板と、樹脂基板の少なくとも一方の面上に形成された複数の検出電極と、樹脂基板の少なくとも一方の面上に形成され且つ複数の検出電極にそれぞれ接続された複数の周辺配線と、樹脂基板の少なくとも一方の面上に形成され且つ複数の周辺配線にそれぞれ接続された複数の外部接続端子とを備え、複数の外部接続端子は、互いに100μm以上200μm以下の端子間距離を隔てると共に500μm以下のピッチで配列され、それぞれ端子間距離以上の端子幅を有するものである。
実施の形態1
図1に、この発明の実施の形態1に係るタッチパネル用導電フィルムの構成を示す。このタッチパネル用導電フィルムは、厚さが40μm以下で且つ可撓性を有する透明な樹脂基板1を有し、この樹脂基板1の表面上に複数の第1の検出電極2が形成されると共に樹脂基板1の裏面上に複数の第2の検出電極3が形成されている。また、樹脂基板1の表面上には、複数の第1の検出電極2に対応する複数の第1の周辺配線4が形成され、この複数の第1の周辺配線4に接続された複数の第1の外部接続端子5が樹脂基板1の縁部に形成されている。同様に、樹脂基板1の裏面上には、複数の第2の検出電極3に対応する複数の第2の周辺配線6が形成され、この複数の第2の周辺配線6に接続された複数の第2の外部接続端子7が樹脂基板1の縁部に形成されている。
樹脂基板1は、可撓性の樹脂材料から構成された透明な基板である。樹脂基板1は、例えば、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)等のポリエステル類、ポリエチレン(PE)、ポリプロピレン(PP)、ポリスチレン、エチレンビニルアセテート(EVA)、シクロオレフィンポリマー(COP)、シクロオレフィンコポリマー(COC)等のポリオレフィン類、ビニル系樹脂、その他、ポリカーボネート(PC)、ポリアミド、ポリイミド、アクリル樹脂、トリアセチルセルロース(TAC)から構成することができる。なお、樹脂基板1は、可撓性および光学特性の観点から、ポリエチレンテレフタレートまたはシクロオレフィンポリマーから構成することが好ましい。尚、「透明な」とは可視光域(波長400nm~800nm)の光の透過率が80%以上を有することを意味する。
樹脂基板1の膜厚は40μm以下であり、下限は特に制限はないが、タッチパネル用導電フィルムの自立性、取り扱い性を考慮すると15μm以上であることが好ましい。
必要に応じて、樹脂基板1の片面または両面には、樹脂基板1上に形成する検出電極、周辺配線および外部接続端子との密着を強化する為、樹脂基板1の透過率を向上させる為、および露光時の裏面の光抜けを防止する為等の目的の為、下塗層を設けても良い。下塗層は単層でも良いし、多層であっても良い。
熱収縮率=|(d2-d1)/d1 |×100(%)
の計算式で求めることができる。
なお、樹脂基板1として、二軸延伸のポリエチレンテレフタレート等を用いると、TD方向(横方向)とMD方向(機械流れ方向)とで、熱収縮率が異なる場合がある。その場合は、熱収縮率が大きい値を「130℃で30分間の熱処理に対する熱収縮率」として用いる。
検出電極とは、タッチパネルの表面への接触を検出する為の電極であり、特開2013-182548に記載された投影型静電容量式タッチパネルにおいて、自己容量方式の電極Xおよび電極Y、または相互容量方式の駆動電極および検知電極に相当する。
図1に示すように、複数の第1の検出電極2は、タッチパネルにおけるアクティブ領域(透光エリア)に形成され、それぞれ第1の方向D1に沿って延び且つ第1の方向D1に直交する第2の方向D2に並列配置されている。また、それぞれの第1の検出電極2の一端には、第1のコネクタ部8が形成されている。一方、複数の第2の検出電極3は、アクティブ領域(透光エリア)に形成され、それぞれ第2の方向D2に沿って延び且つ第1の方向D1に並列配置されている。また、それぞれの第2の検出電極3の両端には、それぞれ第2のコネクタ部9が形成されている。
第1の検出電極2および第2の検出電極は、透明な電極であり、例えば、酸化インジウムスズ(ITO)および酸化インジウム亜鉛(IZO)等で代表される透明導電金属酸化物、PEDOT-PSSおよびチオフェン等の透明高分子導電材料、カーボンナノチューブ(CNT)および銀ナノワイヤー等の透明導電膜、または銀、アルミニウム、銅および金等の金属細線からなるメッシュパターンにより形成されたメッシュ状導電膜で形成することができる。
セルCの形状は、単一のセルCが繰り返し形成された定形セル形状でも、セルCがランダムな形状であっても良い。また、定形セル形状にある一定のランダム性を付与したセミランダム形状であっても良い。定形セル形状の場合、セル形状は正方形、菱形、および正六角形等とすることができるが、モアレ抑制という観点から菱形が好ましく、特に菱形の鋭角の角度が20度以上70度以下であるのが好ましい。また、セルピッチ(隣接するセルCの重心間距離)は、50μm以上500μm以下であることが好ましい。
第1の検出電極2のメッシュパターンと第2の検出電極3のメッシュパターンは、上面側から見たときに、図2に示されているように、第1の検出電極2のメッシュパターンのセルCの中心に第2の検出電極3のメッシュパターンのセルCの角部が配置されることが好ましい。このように第1の検出電極2のメッシュパターンと第2の検出電極3のメッシュパターンを配置にすることにより、金属細線のメッシュ見えをより低減することができる。この際、第1の検出電極2のメッシュパターンと第2の検出電極3のメッシュパターンとの組み合わせで形成されるメッシュパターンの開口率は、90%以上であることが、視認性および樹脂基板1のカールを防止する点で好ましい。
複数の第1の周辺配線4は、非アクティブ領域(額縁部)に形成され、複数の第1の検出電極2に形成された複数の第1のコネクタ部8にそれぞれ対応して一端部が接続されると共に、複数の第1の外部接続端子5にそれぞれ対応して他端部が接続されている。
また、複数の第2の周辺配線6は、非アクティブ領域(額縁部)に形成され、複数の第2の検出電極3に形成された複数の第2のコネクタ部9にそれぞれ対応して一端部が接続されている。この時、複数の第2の周辺配線6は、複数の第2の検出電極3を挟むように複数の第2の検出電極3の一端側と他端側にそれぞれ別れて配置されており、一端側に配置された第2の周辺配線6と他端側に配置された第2の周辺配線6が、第1の方向D1に向かって交互に対応する複数の第2のコネクタ部9と接続されている。また、複数の第2の周辺配線6の他端部は、それぞれ対応して複数の第2の外部接続端子7に接続されている。
また、第1の周辺配線4および第2の周辺配線6の最小線幅および最小間隔は、10μm以上50μm以下であることが好ましい。第1の周辺配線4および第2の周辺配線6の最小線幅および最小間隔が小さいほどタッチパネルの額縁部を小さくすることができ、10μm以上とすることで周辺配線の抵抗不足を抑制して周辺配線間でショートすることを防ぐことができる。
また、第1の周辺配線4上および第2の周辺配線6上を覆うように、ウレタン樹脂、アクリル樹脂、およびエポキシ樹脂等からなる絶縁膜を設けても良い。絶縁膜を設けることにより、第1の周辺配線4および第2の周辺配線6のマイグレーションおよび錆び等を防止できる。
複数の第1の外部接続端子5と複数の第2の外部接続端子7は、タッチパネルの駆動制御回路に接続する為のフレキシブル回路基板に接続されるもので、例えば図1に示すように、タッチパネルの非アクティブ領域(額縁部)に形成され、第1のコネクタ部8に対向する樹脂基板1の一縁部11に沿って配列形成されている。ここで、図3に示すように、複数の第1の外部接続端子5を樹脂基板1の表面上において一縁部11の中央部に配置すると共に、複数の第2の外部接続端子7を樹脂基板1の裏面上において複数の第1の外部接続端子5が配置された中央部を挟む位置に配置することにより、複数の第1の外部接続端子5と複数の第2の外部接続端子7を樹脂基板1の表面側と裏面側とで互いに重ならないように配置することが好ましい。これにより、複数の第1の外部接続端子5に対するフレキシブル回路基板の接続と複数の第2の外部接続端子7に対するフレキシブル回路基板の接続とをそれぞれ容易に行うことができる。
さらに、複数の第1の外部接続端子5および複数の第2の外部接続端子7の形成範囲を樹脂基板1の狭い範囲に留めることができる。このため、樹脂基板1が熱収縮などにより変形した場合でも、複数の第1の外部接続端子5と複数の第2の外部接続端子7の位置がずれることを抑制すると共にフレキシブル回路基板に対する第1の外部接続端子5と第2の外部接続端子7のアライメントがずれることを抑制することができ、タッチパネル用導電フィルムをフレキシブル回路基板に対して確実に電気的に接続することができる。
第1の外部接続端子5と第2の外部接続端子7の膜厚としては、フレキシブル回路基板との電気的接続性の観点から、0.1μm以上10μm以下が好ましい。0.1μmより薄いと、タッチパネル用導電フィルムをフレキシブル回路基板に熱圧着する際に異方性導電フィルムに含まれる導電粒子の潰しが不十分となりフレキシブル回路基板との電気的接続が低下し、10μmを越えると、熱圧着する際に異方性導電フィルムに含まれる導電粒子がフレキシブル回路基板の電極を突き破って電気的接続の低下を招くおそれがある為に好ましくない。
また、第1の外部接続端子5および第2の外部接続端子7と、前述の第1の周辺配線4および第2の周辺配線6とは同一の材料で構成されると共に同一の工程で同時に作製されることが好ましい。
また、図1では、第1の検出電極2が5列に配列されると共に第2の検出電極3が6列に配列されているが、第1の検出電極2の個数および第2の検出電極3の個数に限定されるものではない。
樹脂基板1において複数の第1の外部接続端子5が形成された表面に対して反対側の裏面上に、複数の第1の外部接続端子5が形成された端子形成領域に対応して、厚さ20μm以上150μm以下の絶縁保護層をさらに形成することができる。同様に、複数の第2の外部接続端子7が形成された樹脂基板1の裏面に対して反対側の表面上に、複数の第2の外部接続端子7が形成された端子形成領域に対応して、厚さ20μm以上150μm以下の絶縁保護層を形成することもできる。
さらに、絶縁保護層を保護層と接着部の2層から構成すると共に保護層を樹脂基板1と同じ樹脂材料から構成することにより、樹脂基板1と保護層の熱膨張係数が同じになるので、熱圧着時における樹脂基板1の変形をより効果的に低減できる。
この第1の絶縁保護層21と第2の絶縁保護層22は、それぞれ樹脂基板1を支持して変形から保護するためのもので、例えば、保護部23と、この保護部23と樹脂基板1の間に配置された接着部24とから構成することが好ましい。保護部23は、樹脂基板1と同じ樹脂材料から構成することが好ましい。樹脂基板1と同じ樹脂材料とすることにより、樹脂基板1と熱膨張係数が同じになるので、熱圧着時における樹脂基板1の変形をより効果的に低減することができる。また、接着部24は、接着剤を含んでおり、この接着剤は、アクリル樹脂系、ウレタン樹脂系、シリコーン樹脂系、ゴム系、エチレン-酢酸ビニル共重合体(EVA)、低密度ポリエチレン(LDPE)および超低密度ポリエチレン(VLDPE)等から選ぶことができる。接着部24は、アクリル樹脂系接着剤を有する光学粘着シート(OCA;Optical Clear Adhesive)から構成されることが好ましい。接着部24を光学粘着シート(OCA)とすることにより、フレキシブル回路基板との圧着工程後の工程で、保護部23を剥がすことで、光学粘着シート(OCA)を他の部材との貼り合わせでの接着層として利用でき、工程の簡略化および部材数の低減化が可能となる。
同様に、第2の絶縁保護層22は、第2の外部接続端子7が形成された端子形成領域R2を含む所定の領域に対応して形成することができ、例えば図8に示すように、第2の外部接続端子7が形成された端子形成領域R2のみに対応して形成することができる。また、第2の絶縁保護層22は、図9に示すように、第1の外部接続端子5以外が含まれる領域の全面にわたって形成することもできる。この場合、第2の絶縁保護層22が、樹脂基板1を支持して変形から保護するとともに、第1の検出電極2、第1のコネクタ部8、第1の周辺配線4を保護する保護膜を兼ねることもできるので好ましい。
次に、この発明に係るタッチパネルについて詳細に説明する。
このタッチパネルは、上述したタッチパネル用導電フィルムと、複数の電極が形成されたフレキシブル回路基板と、タッチパネル用導電フィルムとフレキシブル回路基板の間に配置されると共にタッチパネル用導電フィルムの複数の外部接続端子とフレキシブル回路基板の複数の電極を接続する異方性導電フィルムとから構成することができる。
フレキシブル回路基板32は、タッチパネル用導電フィルム31の第1の外部接続端子5に対応して配置される第1のフレキシブル回路基板32aと、第2の外部接続端子7に対応して配置される第2のフレキシブル回路基板32bとを有する。第1のフレキシブル回路基板32aは、第1のフレキシブル基板34aと、第1のフレキシブル基板34aの第1の外部接続端子5に対向する表面に配置される複数の第1の電極35aとを有し、第2のフレキシブル回路基板32bは、第2のフレキシブル基板34bと、第2のフレキシブル基板34bの第2の外部接続端子7に対向する表面に配置される複数の第2の電極35bとを有する。
本発明に用いられるフレキシブル回路基板32は、絶縁性を有するフレキシブル基板と、上記フレキシブル基板の表面上に形成された電極とを有するものである。このようなフレキシブル回路基板32としては、樹脂基板上に検出電極および外部接続端子が形成されたタッチパネル用導電フィルム31との接続に一般的に用いられるものを使用することができる。このフレキシブル回路基板32の電極は、タッチパネル駆動制御回路に接続される。
本発明におけるフレキシブル基板としては、所望の絶縁性を有するものであれば特に限定されるものではないが、例えば、厚さ25μm程度の可撓性のポリイミドフィルム等から構成することができる。その中でも、フレキシブル基板としては、圧着時の圧着温度における熱収縮率がタッチパネル用導電フィルム31と同じであることが、圧着時でのアライメントのズレを防止できるので、特に好ましい。また、フレキシブル回路基板32の電極としては、所望の導電性を有するものであれば特に限定されるものではないが、銀、アルミニウム、銅、金、モリブデン、クロム等の金属およびそれらの合金から構成することができ、これらを単層または積層体として用いたものを使用できる。
本発明における異方性導電フィルム33とは、熱圧着により接着性と厚み方向への導電性とを示す異方導電性材料からなり、タッチパネル用導電フィルム31の外部接続端子とフレキシブル回路基板32の電極とを接続するためのものである。
異方性導電フィルム33としては、絶縁性バインダー中に導電粒子が分散されたフィルム状の構成であることが好ましい。導電粒子としては、所望の導電性を有するものであれば特に限定されるものではないが、金、銀、ニッケル等の金属粒子や、セラミックス、プラスチックまたは金属の粒子を核としてその表面にニッケルや金等の金属皮膜を形成した金属被覆粒子等を挙げることができる。絶縁性バインダーの材料としては、例えばエポキシ樹脂等を挙げることができる。導電粒子の粒子径は5μm~15μmであることが好ましい。本範囲の導電粒子の粒子径を用いることにより、タッチパネル用導電フィルム31とフレキシブル回路基板32との良好な電気的接続を確保しつつ、外部接続端子間がショートすることを効果的に防止できる。
この第2の絶縁保護層22は、保護部23を剥離するだけで接着部24を露出させることができ、図13に示すように、露出した接着部24を介してタッチパネル用導電フィルム31の表面にカバー部材36を接着させることができる。
なお、タッチパネルの構成は本明細書に図示されたものに限定されず、例えば、特開2010-16067号公報等に開示されているように電極の交差部のみに絶縁膜を設け、絶縁膜上に形成したブリッジ配線で接続する構成、ならびにUS2012/0262414等に開示されている交差部がない電極構成のように検出電極が基板の片側にしかない構成のタッチパネルに適用可能である。さらに、樹脂基板1の一方の面上のみに検出電極、周辺配線および外部接続端子を有するタッチパネル用導電フィルムを2枚貼り合わせることにより構成されるタッチパネルに適応可能である。
20Nのテンションを掛けながら150℃の熱処理を3分間実施したポリエチレンテレフタレート(PET)からなる厚さ38μmのシートの表面にコロナ放電による親水化処理を施すことにより樹脂基板を作製した。続いて、樹脂基板の表面上に、下記に示すパターン形成方法により、膜厚1μmのAg膜で構成された第1の検出電極、第1の周辺配線および第1の外部接続端子を形成してタッチパネル用導電フィルムを作製した。ここで、第1の外部接続端子は、100μmの端子間距離dを隔てると共に300μmのピッチPで配列し、それぞれの端子幅Wは200μmとした。なお、第1の検出電極は線幅3μmで且つ鋭角の角度60°である菱形の定形セルからなる開口率98%のメッシュ形状(セルピッチ:300μm)で形成し、第1の周辺配線は線幅20μmで且つ最小間隔を20μmで形成し、第1の外部接続端子は長さLを1mmで形成した。
作製されたタッチパネル用導電フィルムに130℃で30分間の熱処理を施したところ、熱収縮率は0.16%であった。
続いて、ポリイミドからなる厚さ25μmの基板の表面上に銅からなる厚さ12μmの電極を形成したフレキシブル回路基板を、導電粒子の粒子径が10μmφの異方性導電フィルム(CP920AM-16AC:デクセリアルズ株式会社製)を介して、タッチパネル用導電フィルムに130℃20秒で熱圧着することにより、タッチパネルを作製した。
(ハロゲン化銀乳剤の調製)
38℃、pH4.5に保たれた下記1液に、下記の2液および3液の各々90%に相当する量を攪拌しながら同時に20分間にわたって加え、0.16μmの核粒子を形成した。続いて下記の4液および5液を8分間にわたって加え、さらに、下記の2液および3液の残りの10%の量を2分間にわたって加え、0.21μmまで成長させた。さらに、ヨウ化カリウム0.15gを加え、5分間熟成し粒子形成を終了した。
水 750ml
ゼラチン 9g
塩化ナトリウム 3g
1,3-ジメチルイミダゾリジン-2-チオン 20mg
ベンゼンチオスルホン酸ナトリウム 10mg
クエン酸 0.7g
2液:
水 300ml
硝酸銀 150g
3液:
水 300ml
塩化ナトリウム 38g
臭化カリウム 32g
ヘキサクロロイリジウム(III)酸カリウム
(0.005%KCl 20%水溶液) 8ml
ヘキサクロロロジウム酸アンモニウム
(0.001%NaCl 20%水溶液) 10ml
4液:
水 100ml
硝酸銀 50g
5液:
水 100ml
塩化ナトリウム 13g
臭化カリウム 11g
黄血塩 5mg
上記乳剤に1,3,3a,7-テトラアザインデン1.2×10-4モル/モルAg、ハイドロキノン1.2×10-2モル/モルAg、クエン酸3.0×10-4モル/モルAg、2,4-ジクロロ-6-ヒドロキシ-1,3,5-トリアジンナトリウム塩0.90g/モルAgを添加し、クエン酸を用いて塗布液pHを5.6に調整して、感光性層形成用組成物を得た。
樹脂基板の表面に、下塗層として厚み0.1μmのゼラチン層、さらに下塗層上に光学濃度が約1.0で現像液のアルカリにより脱色する染料を含むアンチハレーション層を設けた。上記アンチハレーション層の上に、上記感光性層形成用組成物を塗布し、さらに厚み0.15μmのゼラチン層を設け、表面に感光性層が形成された樹脂基板を得た。表面に感光性層が形成された樹脂基板をフィルムAとする。形成された感光性層は、銀量6.0g/m2、ゼラチン量1.0g/m2であった。
上記フィルムAの表面に、上述の図1の第1の検出電極、第1の周辺配線および第1の外部接続端子が形成されるようにフォトマスクを介し、高圧水銀ランプを光源とした平行光を用いて露光を行った。露光後、下記の現像液で現像し、さらに定着液(商品名:CN16X用N3X-R、富士フイルム社製)を用いて現像処理を行った。さらに、純水でリンスし、乾燥することで、表面にそれぞれAg細線からなる第1の検出電極、第1の周辺配線および第1の外部接続端子と、ゼラチン層とが形成された樹脂基板を得た。ゼラチン層はAg細線間に形成されていた。得られたフィルムをフィルムBとする。
現像液1リットル(L)中に、以下の化合物が含まれる。
ハイドロキノン 0.037mol/L
N-メチルアミノフェノール 0.016mol/L
メタホウ酸ナトリウム 0.140mol/L
水酸化ナトリウム 0.360mol/L
臭化ナトリウム 0.031mol/L
メタ重亜硫酸カリウム 0.187mol/L
上記フィルムBに対して、120℃の過熱蒸気槽に130秒間静置して、加熱処理を行った。加熱処理後のフィルムをフィルムCとする。
フィルムCに対して、タンパク質分解酵素(ナガセケムテックス社製ビオプラーゼAL-15FG)の水溶液(タンパク質分解酵素の濃度:0.5質量%、液温:40℃)に120秒浸漬した。フィルムCを水溶液から取り出し、温水(液温:50℃)に120秒間浸漬し、洗浄した。ゼラチン分解処理後のフィルムをフィルムDとする。このフィルムDがタッチパネル用導電フィルムである。
第1の外部接続端子を150μmの端子間距離dを隔てて350μmのピッチPで配列した以外は、実施例1と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を200μmの端子間距離dを隔てて400μmのピッチPで配列した以外は、実施例1と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を150μmの端子間距離dを隔てて配列し、それぞれの端子幅Wを150μmとした以外は、実施例1と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を400μmのピッチPで配列し、それぞれの端子幅Wを250μmとした以外は、実施例4と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を200μmの端子間幅dを隔てて500μmのピッチPで配列し、それぞれの端子幅Wを300μmとした以外は、実施例1と同様の方法により、タッチパネルを作製した。
樹脂基板の表面上に、上記に示すパターン形成方法により、それぞれ第1の検出電極、第1の周辺配線および第1の外部接続端子を形成すると共に、樹脂基板の裏面上に、上記に示すパターン形成方法により、膜厚1μmのAg膜で構成された第2の検出電極、第2の周辺配線および第2の外部接続端子を形成して、図1に示すタッチパネル用導電フィルムを作製した。ここで、樹脂基板の表面上および裏面上に形成された第1の外部接続端子と第2の外部接続端子は、150μmの端子間距離dを隔てると共に350μmのピッチPで配列し、それぞれの端子幅Wを200μmとした。また、第1の外部接続端子と第2の外部接続端子は、樹脂基板の面方向に沿って100μmの端子間距離Dを隔てて配置した。なお、第1の検出電極と第2の検出電極は線幅3μmで且つ鋭角の角度60°である菱形の定形セルからなる開口率98%のメッシュ形状(セルピッチ:300μm)で形成し、第1の周辺配線と第2の周辺配線は線幅20μmで且つ最小間隔を20μmで形成し、第1の外部接続端子と第2の外部接続端子は長さLを1mmで形成した。ここで、第1の検出電極のメッシュパターンと第2の検出電極のメッシュパターンとは、図2に示すように配置され、第1の検出電極のメッシュパターンと第2の検出電極のメッシュパターンとの組み合わせで開口率96%のメッシュ形状(セルピッチ:150μm)を形成した。
作製されたタッチパネル用導電フィルムに130℃で30分間の熱処理を施したところ、熱収縮率は0.16%であった。
続いて、ポリイミドからなる厚さ25μmの基板の表面上に銅からなる厚さ12μmの電極を形成した2つのフレキシブル回路基板を、それぞれタッチパネル用導電フィルムの表面および裏面に、導電粒子の粒子径が10μmφの異方性導電フィルム(CP920AM-16AC:デクセリアルズ株式会社製)を介して130℃20秒で熱圧着することにより、タッチパネルを作製した。
第1の外部接続端子と第2の外部接続端子を樹脂基板の面方向に沿って300μmの端子間距離Dを隔てて配置した以外は、実施例7と同様の方法により、タッチパネルを作製した。
第1の外部接続端子と第2の外部接続端子を樹脂基板の面方向に沿って500μmの端子間距離Dを隔てて配置した以外は、実施例7と同様の方法により、タッチパネルを作製した。
タッチパネル用導電フィルムの樹脂基板の裏面上に、第1の検出電極に対応して第1の絶縁保護層を形成した以外は、実施例1と同様の方法により、タッチパネルを作製した。ここで、第1の絶縁保護層は、光学粘着シート(OCA)からなる厚さが25μmの接着部(3M社製OCA#8146-1を用いた)と、ポリエチレンテレフタレートからなる厚さが25μmの保護部とから構成される。
タッチパネル用導電フィルムの樹脂基板の裏面上に、第1の検出電極に対応して第1の絶縁保護層を形成した以外は、実施例2と同様の方法により、タッチパネルを作製した。ここで、第1の絶縁保護層は、光学粘着シート(OCA)からなる厚さが25μmの接着部(3M社製OCA#8146-1を用いた)と、ポリエチレンテレフタレートからなる厚さが25μmの保護部とから構成される。
タッチパネル用導電フィルムの樹脂基板の裏面上に、第1の検出電極に対応して第1の絶縁保護層を形成すると共に、樹脂基板の表面上に、第2の検出電極に対応して第2の絶縁保護層を形成した以外は、実施例8と同様の方法により、タッチパネルを作製した。ここで、第1の絶縁保護層は、光学粘着シート(OCA)からなる厚さが25μmの接着部(3M社製OCA#8146-1を用いた)と、ポリエチレンテレフタレートからなる厚さが25μmの保護部とから構成される。また、第2の絶縁保護層は、光学粘着シート(OCA)からなる厚さが50μmの接着部(3M社製OCA#8146-2を用いた)と、ポリエチレンテレフタレートからなる厚さが25μmの保護部とから構成される。
15Nのテンションを掛けながら130℃の熱処理を3分間実施したシクロオレフィンポリマー(COP)からなる厚さ40μmのシートの表面にコロナ放電による親水化処理を施すことにより樹脂基板を作製した以外は、実施例1と同様の方法により、タッチパネルを作製した。尚、タッチパネル用導電シートに130℃で30分間の熱処理を施したところ、熱収縮率は0.16%であった。
15Nのテンションを掛けながら130℃の熱処理を3分間実施したシクロオレフィンポリマー(COP)からなる厚さ40μmのシートの表面にコロナ放電による親水化処理を施すことにより樹脂基板を作製した以外は、実施例8と同様の方法により、タッチパネルを作製した。尚、タッチパネル用導電シートに130℃で30分間の熱処理を施したところ、熱収縮率は0.16%であった。
15Nのテンションを掛けながら130℃の熱処理を3分間実施したシクロオレフィンポリマー(COP)からなる厚さ40μmのシート(130℃で30分間の熱処理に対する熱収縮率は0.16%であった)の表面にコロナ放電による親水化処理を施すことにより樹脂基板を作製すると共に、第1の絶縁保護層の保護部と第2の絶縁保護層の保護部に厚さが40μmのシクロオレフィンポリマー(COP)を用いた以外は、実施例12と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を50μmの端子間距離dを隔てて250μmのピッチPで配列した以外は、実施例1と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を250μmの端子間距離dを隔てて450μmのピッチPで配列した以外は、実施例1と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を250μmのピッチPで配列し、それぞれの端子幅Wを100μmとした以外は、実施例4と同様の方法により、タッチパネルを作製した。
第1の外部接続端子を550μmのピッチPで配列し、それぞれの端子幅Wを350μmとした以外は、実施例6と同様の方法により、タッチパネルを作製した。
(樹脂基板の変形)
樹脂基板を目視で確認した際に、樹脂基板の変形が全く認められない場合をAと評価し、樹脂基板の変形が僅かに認められる場合をBと評価し、樹脂基板の変形は認められるがタッチパネル用導電フィルムとフレキシブル回路基板との間の電気的な接続は維持される程度の変形である場合をCと評価し、タッチパネル用導電フィルムとフレキシブル回路基板との間の電気的な接続が維持できない変形が生じている場合をDと評価した。
この結果を下記第1表~第4表に示す。
第1の外部接続端子または第1の外部接続端子と第2の外部接続端子の両者を目視で確認した際に、フレキシブル回路基板の電極に対してアライメントに殆どずれが生じていない場合をAと評価し、フレキシブル回路基板の電極に対してアライメントにずれが生じている場合をBと評価した。
この結果を下記第1表~第4表に示す。
フレキシブル回路基板と接続された第1の外部接続端子または第2の外部接続端子と、フレキシブル回路基板の電極との間の導通検査をプローブを用いて抵抗測定することにより行った。フレキシブル回路基板の電極に対して良好な電気的な接触が保たれており抵抗値が40Ω以下である場合をAと評価し、フレキシブル回路基板の電極に対して電気的な接触が保たれており抵抗値が40Ωより大きく且つ60Ω以下である場合をB、抵抗値が60Ωより大きくフレキシブル回路基板の電極に対して電気的な接触が保たれておらず導通が取れていない場合をCと評価した。
この結果を下記第1表~第4表に示す。
また、実施例1~3は、第1の外部接続端子の端子間距離dが200μmより大きい比較例2と比較して、樹脂基板の変形が大きく抑制されると共に第1の外部接続端子のコンタクト性が大きく向上していることがわかった。
また、第1の外部接続端子が互いに100μm以上200μm以下の端子間距離dを隔てると共に500μm以下のピッチPで配列され、それぞれ端子間距離d以上の端子幅Wを有する実施例6は、第1の外部接続端子のピッチPが500μmより大きい比較例4と比較して、第1の外部接続端子のアライメントとコンタクト性が共に大きく向上していることがわかった。
Claims (9)
- 厚さが40μm以下で且つ可撓性を有する透明な樹脂基板と、
前記樹脂基板の少なくとも一方の面上に形成された複数の検出電極と、
前記樹脂基板の少なくとも一方の面上に形成され且つ前記複数の検出電極にそれぞれ接続された複数の周辺配線と、
前記樹脂基板の少なくとも一方の面上に形成され且つ前記複数の周辺配線にそれぞれ接続された複数の外部接続端子と
を備え、
前記複数の外部接続端子は、隣り合う外部接続端子が100μm以上200μm以下の端子間距離を隔てると共に500μm以下のピッチで配列され、それぞれ前記端子間距離以上の端子幅を有することを特徴とするタッチパネル用導電フィルム。 - 前記複数の外部接続端子のそれぞれの端子幅は、前記端子間距離に50μmを加えた最小幅以上で且つ前記端子間距離に100μmを加えた最大幅以下である請求項1に記載のタッチパネル用導電フィルム。
- 前記タッチパネル用導電フィルムにおいて、130℃で30分間の熱処理に対する熱収縮率が0.20%以下である請求項1または2に記載のタッチパネル用導電フィルム。
- 前記樹脂基板において前記複数の外部接続端子が形成された面に対して反対側の面上に、前記複数の外部接続端子が形成された端子形成領域に対応して、厚さ20μm以上150μm以下の絶縁保護層をさらに有する請求項1~3のいずれか一項に記載のタッチパネル用導電フィルム。
- 前記樹脂基板は、ポリエチレンテレフタレートまたはシクロオレフィンポリマーからなる請求項1~4のいずれか一項に記載のタッチパネル用導電フィルム。
- 前記複数の検出電極は、開口率90%以上のメッシュ形状を有する請求項1~5のいずれか一項に記載のタッチパネル用導電フィルム。
- 前記樹脂基板の両面上にそれぞれ前記複数の検出電極と前記複数の周辺配線と前記複数の外部接続端子が形成されている請求項1~6のいずれか一項に記載のタッチパネル用導電フィルム。
- 前記樹脂基板の一方の面上に形成された前記複数の外部接続端子と他方の面上に形成された前記複数の外部接続端子は、互いに最も近い位置に存在する外部接続端子同士の前記樹脂基板の面方向に沿った方向の距離で300μm以上隔てて配置されている請求項7に記載のタッチパネル用導電フィルム。
- 請求項1~8のいずれか一項に記載のタッチパネル用導電フィルムと、
複数の電極が形成されたフレキシブル回路基板と、
前記タッチパネル用導電フィルムと前記フレキシブル回路基板の間に配置されると共に前記タッチパネル用導電フィルムの前記複数の外部接続端子と前記フレキシブル回路基板の前記複数の電極を接続する異方性導電フィルムと
を備えたタッチパネル。
Priority Applications (5)
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| US15/418,844 US20170185187A1 (en) | 2014-09-08 | 2015-05-18 | Conductive film for touch panel and touch panel |
| CN201580036952.1A CN106489121B (zh) | 2014-09-08 | 2015-05-18 | 触摸面板用导电膜及触摸面板 |
| JP2016547722A JP6240789B2 (ja) | 2014-09-08 | 2015-05-18 | タッチパネル用導電フィルムおよびタッチパネル |
| CN201910554437.2A CN110347286B (zh) | 2014-09-08 | 2015-05-18 | 触摸面板用导电膜及触摸面板 |
| CN201910553911.XA CN110297560B (zh) | 2014-09-08 | 2015-05-18 | 触摸面板用导电膜及触摸面板 |
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| WO2022138051A1 (ja) * | 2020-12-21 | 2022-06-30 | 京セラ株式会社 | 表示装置および表示装置の製造方法 |
| JP7466701B2 (ja) | 2020-12-21 | 2024-04-12 | 京セラ株式会社 | 表示装置および表示装置の製造方法 |
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| JP2022158850A (ja) * | 2021-03-31 | 2022-10-17 | ティーピーケイ アドバンスド ソリューションズ インコーポレーテッド | タッチセンサ |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110297560B (zh) | 2023-06-27 |
| JPWO2016038940A1 (ja) | 2017-04-27 |
| CN110347286B (zh) | 2023-06-27 |
| CN110297560A (zh) | 2019-10-01 |
| US20170185187A1 (en) | 2017-06-29 |
| CN110347286A (zh) | 2019-10-18 |
| JP6240789B2 (ja) | 2017-11-29 |
| CN106489121A (zh) | 2017-03-08 |
| CN106489121B (zh) | 2019-07-30 |
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