Touch sensor, window laminate including the same, and image display device

Abstract

A touch sensor includes: a display portion including a base layer and a touch sensor layer on the base layer; a bent portion extending from the display portion and including a first portion of a trace electrically connected to the touch sensor layer but not including the base layer; and a joining portion extending from the bent portion and including a second portion of the trace, wherein an end portion of the second portion of the trace is connected to a flexible circuit board.

Description

Technical Field

[0001] The present invention relates to a touch sensor, and in particular to a touch sensor having a bent portion. Background Art

[0002] A display device is a device that displays information externally, and examples thereof include a liquid crystal display device, a plasma display panel device, an electroluminescent display device, and an organic light emitting diode display device.

[0003] The display device includes a touch sensor panel, which is a device for inputting user commands by touching the content displayed on the screen with a finger or a pen. The touch sensor panel includes a plurality of sensing electrodes for sensing the contact position. The sensing electrodes can be divided into a first sensing electrode connected in the X-axis direction and a second sensing electrode connected in the Y-axis direction, and they can be connected to a trace. The trace is connected to the FPCB at the end, and the FPCB is connected to the main PCB, so that the sensing signal of the touch sensor panel can be transmitted to the outside.

[0004] The touch sensor panel is located on top of the display panel. In this case, the sensing electrodes are placed in the display area of ​​the display panel, and the traces and FPCB joints are placed in the non-display area at the edge of the display area, that is, the frame area.

[0005] Recently, efforts have been made to expand the display area by reducing the bezel area of ​​the display device. As part of these efforts, research is actively underway to minimize the bezel area by bending the traces of the touch sensor panel and the FPCB joint to the rear and placing them on the rear side of the display panel.

[0006] Figure 1A and Figure 1B 1 and 2 are respectively a perspective view and a cross-sectional view of a touch sensor according to the prior art.

[0007] like Figure 1A and Figure 1B As shown, a conventional touch sensor includes a display portion A including sensing electrodes, a bent portion B extending from the display portion A and bending, and a bonding portion C extending from the bent portion B to bond with and connect to an FPCB 200. Here, the bent portion B includes a base layer 110, a touch sensor layer 120, a protective layer 130, and the like.

[0008] The base layer 110 is made of a film material, for example, polyethylene etherphthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyethersulfonic acid, polyimide, etc. However, such a base layer 110 is thick and has a high elastic modulus to satisfy the supporting role, which may make the bending portion B difficult to bend and cause cracks in the bending portion touch sensor layer during bending. Summary of the Invention

[0009]

Technical Issues

[0010] The present invention is to solve the above-mentioned problems in the prior art.

[0011] Therefore, the present invention is intended to provide a touch sensor having the following features:

[0012] First, in a touch sensor having a curved portion, the curved portion can be easily bent;

[0013] Second, damage such as cracks can be prevented from occurring in the touch sensor layer of the bent portion; and

[0014] Third, when the structure of the bent portion is formed differently in order to make the bent portion easy to bend, the process of separately forming a lower support base for FPCB bonding through the FPCB bonding process is eliminated, thereby simplifying the process, shortening the process time and reducing the manufacturing cost.

[0015]

Technical solution

[0016] The touch sensor of the present invention for achieving the above-mentioned object may include a display portion, a bending portion, a joint portion, and the like.

[0017] The display portion may include a base layer and a touch sensor layer on the base layer.

[0018] The bent portion may extend from the display portion and may include a first portion of a trace electrically connected to the touch sensor layer, but may not include a base layer.

[0019] The joining portion may extend from the bent portion and include a second portion of the trace, wherein an end portion of the second portion of the trace may be connected to the flexible circuit board.

[0020] In the touch sensor of the present invention, the bending portion may include a bending portion protection layer on an upper surface or a lower surface of the trace.

[0021] In the touch sensor of the present invention, the bending portion protection layer may be made of a curable resin selected from a UV curable resin, an optically clear adhesive (OCA), and a pressure sensitive adhesive (PSA).

[0022] In the touch sensor of the present invention, the bent portion may be thinner than the display portion and the bonding portion.

[0023] In the touch sensor of the present invention, the bending portion may include a bending portion touch sensor layer extending from the touch sensor layer of the display portion and having a thickness of 2 μm to 10 μm.

[0024] In the touch sensor of the present invention, the bending portion protection layer may have an elastic modulus of 0.1 MPa to 1000 MPa.

[0025] In the touch sensor of the present invention, the base layer may include at least one of a polarizer, a polarizing plate, a retardation film, a reflective sheet, a brightness enhancement film, and a refractive index matching film.

[0026] In the touch sensor of the present invention, the engaging portion may include an upper supporting base and a lower supporting base on the upper surface and the lower surface of the flexible circuit board, respectively.

[0027] In the touch sensor of the present invention, the upper support base and the lower support base may overlap with the second portion of the trace included in the joining portion.

[0028] In the touch sensor of the present invention, the lower supporting base may be the same as the base layer of the display portion.

[0029] In the touch sensor of the present invention, the base layer and the lower supporting base may have through holes in the region of the bent portion.

[0030] The touch sensor of the present invention may further include an adhesive layer between the base layer of the display portion and the touch sensor layer and between the lower support base and the traces of the bonding portion.

[0031] In the touch sensor of the present invention, the adhesive layer may have a through hole in the region of the bent portion.

[0032] A window laminate according to the present invention may include a window substrate and the touch sensor as described above, wherein the touch sensor is stacked on one surface of the window substrate.

[0033] An image display device according to the present invention may include a display panel and the touch sensor as described above, the touch sensor being stacked on one surface of the display panel.

[0034] Beneficial effects

[0035] According to the touch sensor of the present invention having such a configuration, the bent portion of the touch sensor can be easily bent by minimizing or optimizing the thicknesses of the bent portion touch sensor layer and the bent portion protection layer protecting the bent portion touch sensor layer.

[0036] According to the touch sensor of the present invention, damage to the bend touch sensor layer can be prevented or minimized by optimizing the elastic modulus of the bend protection layer to minimize stress applied to the bend touch sensor layer by the bend application protection layer.

[0037] In addition, according to the touch sensor of the present invention, by forming the lower supporting base of the bonding part in the same process as the base layer of the display part, there is no need to further construct the lower supporting base for bonding through the FPCB bonding process, thereby simplifying the process, shortening the process time and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1A and Figure 1B 1 and 2 are respectively a perspective view and a cross-sectional view of a touch sensor according to the prior art.

[0039] Figure 2 is a cross-sectional view showing a first embodiment of a touch sensor having a bent portion according to the present invention.

[0040] Figure 3 is a cross-sectional view showing a second embodiment of a touch sensor having a bent portion according to the present invention.

[0041] Figure 4 is a cross-sectional view showing a third embodiment of a touch sensor having a bent portion according to the present invention.

[0042] Figure 5 is a cross-sectional view showing a fourth embodiment of a touch sensor having a bent portion according to the present invention.

[0043] Figure 6 is a cross-sectional view showing a fifth embodiment of a touch sensor having a bent portion according to the present invention.

[0044] Figure 7 is a cross-sectional view showing a sixth embodiment of a touch sensor having a bent portion according to the present invention.

[0045] Figures 8A to 8D A method of simultaneously forming a base layer of a display part and a lower supporting base of a bonding part in a touch sensor according to the present invention is shown. DETAILED DESCRIPTION

[0046] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0047] Figure 2 is a cross-sectional view of a first embodiment of a touch sensor having a bent portion according to the present invention.

[0048] like Figure 2As shown, the first embodiment of the touch sensor according to the present invention may be composed of a display portion A, a bending portion B, a bonding portion C, and the like.

[0049] The display portion A may be composed of a base layer 110 , a display portion touch sensor layer 120 , a display portion protection layer 130 , and the like.

[0050] As the base layer 110, a film having good transparency, mechanical strength and thermal stability can be used. Specific examples include films made of thermoplastic resins such as polyester resins, such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate. Cellulose resins such as diacetyl cellulose and triacetyl cellulose; polycarbonate resins; acrylate resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; styrene resins such as polystyrene and acrylonitrile-styrene copolymers; polyolefin resins such as polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure and ethylene-propylene copolymers; vinyl chloride resins; amide resins such as nylon and aromatic polyamide; imide resins; polyethersulfone resins; sulfone resins; polyetheretherketone resins; polyphenylene sulfide resins; vinyl alcohol resins; vinylidene chloride resins; vinyl butyral resins; allyl compound resins; polyoxymethylene resins; and epoxy resins. In addition, a film composed of a blend of the above-mentioned thermoplastic resins can be used. In addition, a film made of a thermosetting resin or a UV curable resin such as (meth)acrylate, urethane, acrylic urethane, epoxy resin, and silicone resin can be used. The base layer 110 can have an elastic modulus of 1000 MPa to 3000 MPa and a thickness of 40 μm to 100 μm.

[0051] The base layer 110 may include a polarizer, a polarizing plate, a retardation film, a reflective sheet, a brightness enhancement film, a refractive index matching film, and the like.

[0052] The display part touch sensor layer 120 is used to sense a touch signal, and may include a separation layer, an electrode layer, an insulating layer, and the like.

[0053] The separation layer may be applied to a carrier substrate, and an electrode layer or the like may be formed thereon. The separation layer may be finally separated from the carrier substrate. The peel strength of the separation layer is preferably 1 N / 25 mm or less, more preferably 0.1 N / 25 mm or less.

[0054] The thickness of the separation layer can be 10 nm to 1000 nm, preferably 50 nm to 500 nm. If the thickness of the separation layer is less than 10 nm, the uniformity of the separation layer during application may be poor, and the electrode layer may be unevenly formed, or the peel strength may increase locally, causing tearing. On the other hand, if the thickness is 1000 nm or more, the peel strength may not decrease further, or the flexibility of the membrane may deteriorate.

[0055] The separation layer is an organic polymer membrane and can be made of, for example, at least one selected from the group consisting of polyimide, polyvinyl alcohol, polyamic acid, polyamide, polyethylene, polystyrene, polynorbornene phenylmaleimide copolymer, polyazobenzene, polyphenylene phthalamide, polyester, polymethyl methacrylate, polyarylate, cinnamate polymer, coumarin polymer, phthalimide polymer, chalcone polymer and aromatic acetylene polymer.

[0056] The electrode layer may be formed on the separation layer. The electrode layer may include a sensing electrode that senses whether it has been touched.

[0057] The electrode layer is a transparent conductive layer and may be formed of one or more materials selected from metals, metal nanowires, metal oxides, carbon nanotubes, graphene, conductive polymers, and conductive inks.

[0058] The metal may be any one of gold (Au), silver (Ag), copper (Cu), molybdenum (Mo), aluminum (Al), palladium (Pd), neodymium (Nd), and silver-palladium-copper alloy (APC). The metal nanowire may be any one of silver nanowire, copper nanowire, zirconium nanowire, and gold nanowire. The metal oxide may be any one of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), fluorine tin oxide (FTO), zinc oxide (ZnO), indium tin oxide-silver-indium tin oxide (ITO-Ag-ITO), indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc tin oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO), and aluminum zinc oxide-silver-aluminum zinc oxide (AZO-Ag-AZO). The conductive polymer may include polypyrrole, polythiophene, polyacetylene, PEDOT, polyaniline, and the like. Conductive ink is a mixture of metal powder and a curable polymer binder, and electrodes can be formed using them.

[0059] An insulating layer can be formed on the electrode layer. The insulating layer can prevent corrosion of the electrode layer and protect the surface of the electrode layer. The insulating layer can be formed to have a constant thickness while filling gaps between electrodes or wiring. The surface opposite the surface in contact with the electrode layer can be flattened to conceal the uneven structure of the electrode layer. The insulating layer can be composed of a curable prepolymer, a curable polymer, a plastic polymer, or the like.

[0060] The display touch sensor layer 120 may further include a touch sensor protection layer, a bridge portion, a passivation layer, and the like.

[0061] A touch sensor protection layer may be further formed on the separation layer. When it is difficult to protect the electrode layer from external contact or impact using a single separation layer, one or more touch sensor protection layers may be additionally formed on the separation layer. The touch sensor protection layer may be formed from an organic insulating film, an inorganic insulating film, or the like, and may be formed using methods such as coating and curing, or vapor deposition.

[0062] The bridge may be formed on the insulating layer. The bridge may be formed by forming a hole in the insulating layer and depositing or photo-etching a transparent metal oxide within the hole and over the insulating layer.

[0063] A passivation layer may be formed on the insulating layer and the bridge portion. The passivation layer protects the bridge portion. It may be formed from an organic film and may be formed using methods such as vapor deposition and sputtering. The passivation layer may be made of a material having the same refractive index as the insulating layer.

[0064] The display portion protective layer 130 may be bonded to the upper portion of the display portion touch sensor layer 120. The display portion protective layer 130 may be a film including an adhesive layer on at least one surface of a film made of a polymer resin, or a film having self-adhesive properties (e.g., polypropylene), and may be used to protect the surface of the display portion touch sensor layer and improve workability.

[0065] In the above-described display part A, the display part touch sensor layer 120 may be a single-layer structure in which the sensing electrode consists of one layer or a multi-layer structure of two or more layers.

[0066] The display touch sensor layer 120 may further include traces electrically connected to the sensing electrodes as part thereof, as well as the sensing electrodes.

[0067] The bent portion B may be bent in the thickness direction, for example, backward, and extend to the rear of the display panel (not shown).

[0068] The bending portion B may consist of only the bending portion touch sensor layer 120 and the bending portion protection layers 310 and 320 , and may not include the base layer 110 or the like under the bending portion touch sensor layer 120 .

[0069] The flexure touch sensor layer 120 extends from the display touch sensor layer 120 and may be configured to have the same structure as the display touch sensor layer 120 , and its detailed description is replaced by the description of the display A described above.

[0070] The curved portion touch sensor layer 120 may further include a touch sensor protection layer, a bridge portion, a passivation layer, etc. The touch sensor protection layer, the bridge portion, and the passivation layer are the same as those described above in the display portion A, and their detailed descriptions are replaced by the above-mentioned related descriptions.

[0071] When the bending portion touch sensor layer 120 includes a separation layer, an electrode layer, and an insulating layer and further includes a touch sensor protection layer, a bridge portion, and a passivation layer, the thickness thereof may be in the range of 2 μm to 10 μm.

[0072] The flexure touch sensor layer 120 is described above as including an electrode layer (sensing electrode), but may be configured as a portion of a trace that does not include an electrode layer (sensing electrode).

[0073] The bending protection layers 310 and 320 are formed on upper and lower surfaces of the bending touch sensor layer 120 , respectively, and may include a lower bending protection layer 310 and an upper bending protection layer 320 .

[0074] The bend protection layers 310 and 320 can be made of a curable resin. Since the bend protection layers 310 and 320 are applied to the bend touch sensor layer 120, if their elastic modulus is high, stress may be generated during bending, causing cracks in the bend touch sensor layer 120. To address the crack issue in the bend touch sensor layer 120, the bend protection layers 310 and 320 were inspected for cracks when the bend B was bent to a radius of 0.3R (the radius of the actual product bend) based on their elastic moduli.

[0075] Table 1 below shows whether cracks occur in the bent portion touch sensor layer 120 according to the elastic modulus of the curable resin when the bent portion B is bent to 0.3R.

[0076]

Table 1

[0077]

[0078]

[0079] As can be seen from Table 1 above, when the elastic modulus of the curable resin is within the range of 0.1 MPa to 1000 MPa, cracks do not occur in the curved touch sensor layer 120. Therefore, in the present invention, the upper limit of the elastic modulus of the curable resin is defined as 1000 MPa, which has technical significance. On the other hand, the lower the elastic modulus of the curable resin, the less stress is applied to the curved touch sensor layer 120. However, if the elastic modulus is too low, rigidity is insufficient and viscosity increases, which may degrade workability. Therefore, in the present invention, the lower limit of the elastic modulus of the curable resin is defined as 0.1 MPa, the lowest value at which cracks do not occur.

[0080] As described above, when the bend protection layers 310 and 320 are made of a curable resin, setting their elastic modulus to 0.1 MPa to 1000 MPa can prevent cracks or breakage in the bend touch sensor layer 120 in the bend B. The curable resin may be a UV curable resin, an optically clear adhesive (OCA), a pressure sensitive adhesive (PSA), or the like. For example, it may be formed from an adhesive composition containing an acrylic copolymer and a crosslinking agent, or an adhesive composition containing a urethane (meth)acrylate resin, a (meth)acrylate monomer, and a photoinitiator. The bend protection layers 310 and 320 may be formed to have a thickness of 1 μm to 200 μm, and preferably, this thickness is less than the thickness of the base layer 110, the polarizing film 111, or the protective layer 130.

[0081] If the thickness of the bend protection layers 310 and 320 is less than 1 μm, uniformity is reduced when the bend protection layers 310 and 320 are applied, resulting in the formation of an uneven film or voids, thereby causing cracks or tears in the bend touch sensor layer 120. On the other hand, if the thickness of the bend protection layers 310 and 320 is greater than 200 μm, flexibility may be reduced, or the thickness may become higher than that of the base layer 110, the polarizing film 111, or the protection layer 130, which may cause interference during the cover glass bonding or bending process.

[0082] The joint portion C extends from the bent portion B, has one side connected to the FPCB 200 , and includes a joint touch sensor layer 120 , a lower support base 410 , an upper support base 420 , and the like.

[0083] The joint touch sensor layer 120 extends from the flexure touch sensor layer 120 and may be configured in the same manner as the display touch sensor layer 120 and the flexure touch sensor layer 120. The joint touch sensor layer 120 may be provided with a bonding pad on one side, i.e., at an end. The bonding pad may be bonded to the FPCB 200.

[0084] The above describes the joint touch sensor layer 120 as including an electrode layer (sensing electrode), but it can be configured as another part of the trace that does not include the electrode layer (sensing electrode), that is, another part of the trace extending from the bend touch sensor layer 120 consisting of a part of the trace.

[0085] The lower support base 410 may be coupled to the lower portion of the joint touch sensor layer 120 to support the joint touch sensor layer 120 and the lower side of the FPCB 200. The lower support base 410 may be formed of a polymer film having a thickness of 40 to 100 μm, similar to the base layer 110 of the display part A.

[0086] The upper support base 420 may be combined to overlap the joint touch sensor layer 120 and the upper portion of the FPCB 200. The upper support base 420 may cover and support at least a portion of the upper side of the FPCB 200. The upper support base 420 may be formed of a polymer film having a thickness of 40 μm to 100 μm, similar to the base layer 110 of the display part A.

[0087] Figure 3 is a cross-sectional view showing a second embodiment of a touch sensor having a bent portion according to the present invention.

[0088] like Figure 3 As shown, in the second embodiment, the display part A may be composed of a polarizing film 111, a PSA 113, a display part touch sensor layer 120, a display part protective layer 130, etc. The PSA 113 may couple the polarizing film 111 serving as a base layer to the display part touch sensor layer 120.

[0089] The curved portion B may be composed of a curved portion touch sensor layer 120, a lower UV curable resin 311 coupled to the lower surface of the curved portion touch sensor layer 120, and an upper UV curable resin 321 coupled to the upper surface of the curved portion touch sensor layer 120. The curved portion touch sensor layer 120 may have a thickness of 2 μm to 10 μm. The lower UV curable resin 311 and the upper UV curable resin 321 may each have an elastic modulus of 0.1 MPa to 1000 MPa and a thickness of 1 μm to 200 μm.

[0090] The joint portion C may be composed of the joint portion touch sensor layer 120 , the lower support base 410 , the upper support base 420 , and the like.

[0091] Figure 4 is a cross-sectional view showing a third embodiment of a touch sensor having a bent portion according to the present invention.

[0092] like Figure 4 As shown in FIG. 1 , in the third embodiment, the display unit A may be composed of a polarizing film 111, a PSA 113, a display unit touch sensor layer 120, an upper OCA 133, a release film 131, and the like. The PSA 113 may couple the polarizing film 111, serving as a base layer, to the display unit touch sensor layer 120. The upper OCA 133 may protect the upper surface of the display unit touch sensor layer 120 and couple the release film 131 to the display unit touch sensor layer 120.

[0093] The curved portion B may be composed of a curved portion touch sensor layer 120, a lower UV-curable resin 311 coupled to the lower surface of the curved portion touch sensor layer 120, and an upper OCA 133 coupled to the upper surface of the curved portion. The upper OCA 133 of the curved portion B may be the same as the upper OCA 133 of the display portion A. The curved portion touch sensor layer 120 may have a thickness of 2 μm to 10 μm. The lower UV-curable resin 311 and the upper OCA 133 may each have an elastic modulus of 0.1 MPa to 1000 MPa and a thickness of 1 μm to 200 μm.

[0094] The joint C may be composed of the joint touch sensor layer 120 , the lower support base 410 , the upper support base 420 , etc. In the joint C, the upper OCA 133 of the bend B may extend to certain areas of the joint touch sensor layer 120 and the upper support base 420 .

[0095] Figure 5 is a cross-sectional view showing a fourth embodiment of a touch sensor having a bent portion according to the present invention.

[0096] like Figure 5 As shown in FIG. 1 , in the fourth embodiment, the display unit A may be composed of a polarizing film 111, a lower OCA 115, a display unit touch sensor layer 120, an upper OCA 133, a release film 131, and the like. The lower OCA 115 may couple the polarizing film 111, serving as a base layer, to the display unit touch sensor layer 120. The upper OCA 133 may protect the upper surface of the display unit touch sensor layer 120 and couple the release film 131 to the display unit touch sensor layer 120.

[0097] The curved portion B may be composed of a curved portion touch sensor layer 120, a lower OCA 115 coupled to the lower surface of the curved portion touch sensor layer 120, and an upper OCA 133 coupled to the upper surface of the curved portion touch sensor. The curved portion touch sensor layer 120 may have a thickness of 2 μm to 10 μm. The lower OCA 115 and the upper OCA 133 may each have an elastic modulus of 0.1 MPa to 1000 MPa and a thickness of 1 μm to 200 μm.

[0098] The joint C may be composed of the joint touch sensor layer 120, the lower support base 410, the upper support base 420, etc. The joint C may couple the joint touch sensor layer 120 and the lower support base 410 by extending the lower OCA 115 of the bend B between the joint touch sensor layer 120 and the lower support base 410. In the joint C, the upper OCA 133 of the bend B may extend to be formed in certain areas between the joint touch sensor layer 120 and the upper support base 420.

[0099] Figure 6 is a cross-sectional view showing a fifth embodiment of a touch sensor having a bent portion according to the present invention.

[0100] like Figure 6 As shown, in the fifth embodiment, the display part A may be composed of a polarizing film 111, a lower OCA 115, a display part touch sensor layer 120, a display part protective layer 130, etc. The lower OCA 115 may couple the polarizing film 111 serving as a base layer to the display part touch sensor layer 120.

[0101] The curved portion B may be composed of a curved portion touch sensor layer 120, an OCA 115 coupled to the lower surface of the curved portion touch sensor layer 120, and an upper UV curable resin 321 coupled to the upper surface of the curved portion touch sensor layer 120. The curved portion touch sensor layer 120 may have a thickness of 2 μm to 10 μm. The OCA 115 and the upper UV curable resin 321 may each have an elastic modulus of 0.1 MPa to 1000 MPa and a thickness of 1 μm to 200 μm.

[0102] The joint C may be composed of the joint touch sensor layer 120 , the lower support base 410 , the upper support base 420 , etc. In the joint C, the OCA 115 of the bent portion B may extend to be formed between the joint touch sensor layer 120 and the lower support base 410 .

[0103] Figure 7 is a cross-sectional view showing a sixth embodiment of a touch sensor having a bent portion according to the present invention.

[0104] like Figure 7 As shown in the sixth embodiment, the display unit A can be composed of a display unit base layer 110, a display unit adhesive layer 117, a display unit touch sensor layer 120, a display unit protective layer 130, etc. The base layer 110 can include a polarizer, a polarizing plate, a retardation film, a reflective sheet, a brightness enhancement film, a refractive index matching film, etc. As the display unit adhesive layer 117, a pressure sensitive adhesive (PSA), an optically clear adhesive (OCA), etc. can be used. The display unit touch sensor layer 120 can be coupled to the display unit base layer 110 via the display unit adhesive layer 117.

[0105] The bending portion B may be composed of only the bending portion touch sensor layer 120 and the bending portion protection layers 310 and 320 .

[0106] The joint C extends from the bent portion B, with one side thereof coupled to the FPCB 200. It may be composed of a joint base layer 110, a joint adhesive layer 117, a joint touch sensor layer 120, an upper support base 420, and the like.

[0107] Figures 8A to 8D A method of simultaneously forming a base layer of a display part and a lower supporting base of a bonding part in a touch sensor according to the present invention is shown.

[0108] Figure 8A and Figure 8B 1 and 2 are perspective and plan views of an original substrate 110 for forming the touch sensor of the present invention.

[0109] like Figure 8A and Figure 8B As shown, the original base layer 110 may include a through hole H in the region of the bent portion B. The through hole H may be formed to have a width smaller than the width of the original base layer 110 in the entire region of the bent portion B.

[0110] The original base layer 110 may be coupled to one surface of the touch sensor layer 120 disposed across the display portion A, the bent portion B, and the joint portion C via the adhesive layer 117. At this time, the through hole H of the original base layer 110 corresponds to the region of the bent portion B. Therefore, in the touch sensor as a final product, the through hole H is sealed by the bent portion touch sensor layer 120.

[0111] The adhesive layer 117 may be bonded to the touch sensor layer 120 while being previously bonded to the original base layer 110. At this time, the adhesive layer 117 may also be provided with through holes at positions corresponding to the through holes H of the original base layer 110.

[0112] When the lower portion of the bend touch sensor layer 120 is composed of an adhesive layer such as OCA, PSA, etc., it may be used as a bend protection layer without forming a through hole.

[0113] Figure 8C FIG. 1 is a plan view illustrating a process of punching the original base layer 110 to form the touch sensor of the present invention.

[0114] like Figure 8C As shown, the touch sensor layer 120, in which the original base layer 110 and the touch sensor layer 120 are combined, can be punched along points spaced a predetermined distance from the edge to the inside. In this case, the punching line CL is located further inward than both ends of the through hole H. Therefore, after punching, the original base layer 110 can be deformed into a shape in which both sides in the width direction that are not perforated are removed.

[0115] Figure 8D is a perspective view showing the sixth embodiment of the touch sensor after punching the original base layer 110 .

[0116] like Figure 8DAs shown, the base layer 110 after the punching process exists only in the display portion A and the bonding portion C. In the bending portion B, the bending portion touch sensor layer 120 may exist without the base layer 110. If the bending portion protection layers 310 and 320 applied on the bending portion touch sensor layer 120 are formed, the bending portion protection layers 310 and 320 exist in the bending portion B region.

[0117] The present invention has been described above by way of various embodiments, which are intended to illustrate the present invention. Those skilled in the art will be able to modify or revise these embodiments in other forms. However, since the scope of the present invention is defined by the appended claims, it is understood that such modifications or revisions are included within the scope of the present invention.

[0118] [Explanation of Reference Numerals]

[0119] A: Display part B: Curved part

[0120] C: Joint 110: Base layer

[0121] 111: Polarizing film 113: PSA

[0122] 115: Lower OCA 117: Adhesive layer

[0123] 120: Touch sensor layer 130: Protective layer

[0124] 131: Release film 133: Upper OCA

[0125] 200: FPCB 310: Lower bending part protection layer

[0126] 311: Lower UV curable resin 320: Upper curved portion protective layer

[0127] 321: Upper UV curable resin 410: Lower support base

[0128] 420: Upper support base CL: Punching line

[0129] H: Through hole.

Claims

1. A touch sensor comprising: a display portion, the display portion comprising a base layer and a touch sensor layer on the base layer; a bent portion extending from the display portion and including a first portion of a trace electrically connected to the touch sensor layer but not including a base layer, the bent portion including a bent portion protective layer on an upper surface or a lower surface of the trace, the bent portion protective layer being formed of a curable resin, and having an elastic modulus of 0.1 MPa to 1000 MPa; and a joint portion extending from the bent portion and including a second portion of the trace, wherein an end portion of the second portion of the trace is connected to a flexible circuit board, in, The joint portion includes an upper supporting base and a lower supporting base on the upper surface and the lower surface of the flexible circuit board, respectively, and The original base layer having a through hole is punched along a punching line formed by points spaced a predetermined distance from the edge to the inside, wherein the punching line is located further inside than both ends of the through hole in the width direction, so as to remove the two sides in the width direction that are not perforated, so that the bent portion does not include the base layer.

2. The touch sensor according to claim 1, wherein The curable resin is selected from UV curable resin, optically clear adhesive OCA or pressure sensitive adhesive PSA.

3. The touch sensor according to claim 1, wherein The bent portion is thinner than the display portion and the joining portion.

4. The touch sensor according to claim 3, wherein: The bending portion includes a bending portion touch sensor layer extending from the touch sensor layer of the display portion and having a thickness of 2 μm to 10 μm.

5. The touch sensor according to claim 1, wherein The base layer includes at least one of a polarizer, a polarizing plate, a retardation film, a reflective sheet, a brightness enhancement film, and a refractive index matching film. The touch sensor according to claim 1 , wherein: The upper support base and the lower support base overlap the second portion of the trace included in the joint. 7 . The touch sensor according to claim 1 , further comprising an adhesive layer between the base layer of the display portion and the touch sensor layer and between the lower support base of the bonding portion and the traces.

8. The touch sensor according to claim 7, wherein: The adhesive layer has a through hole in the region of the bent portion.

9. A window laminate comprising: Window substrate; and The touch sensor according to any one of claims 1 to 8, wherein the touch sensor is stacked on one surface of the window substrate.

10. An image display device, comprising: Display panel; and The touch sensor according to any one of claims 1 to 8, wherein the touch sensor is stacked on the display panel.

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