TW201506499A - Display device with input function - Google Patents

Abstract

The present invention provides a display device with input function capable of realizing reduction in thickness. The display device includes: a display device, which has a display panel and a frame portion that covers at least one portion of a surface peripheral edge portion of the display panel; and a touch panel, which is arranged on a front side of the display panel by means of an adhesive layer. The adhesive layer is arranged on a surface area of the display panel that is not covered by the frame portion to bond the display panel to the touch panel.

Description

Display device with input function

The present invention relates to a display device with an input function, and more particularly to a display device with an input function for detecting a place where a user touches input as an input position.

It has been known to mount a touch panel and display a user's touch on a display device (display device) such as a bank terminal (automatic teller machine), a ticket vending machine, a smart phone, a personal computer, an OA device, an electronic notebook, a PDA, or the like. A display device with an input function for detecting the position of the touch panel as an input position (see, for example, Patent Document 1). As shown in FIG. 9, the display device with an input function disclosed in Patent Document 1 is configured such that an opening portion 102 of the outer casing 101 of the display device 100 is housed therein, and the touch panel 104 is fixedly bonded via the adhesive layer 103. The peripheral portion of the cover 105.

In such a display device with an input function, the overall thickness reduction is strongly expected, and as a countermeasure against this, the thickness of the lid body and the adhesive layer is being studied. However, in the case of the display device with an input function shown in FIG. 9, the peripheral portion of the lid body 105 to which the touch panel 104 is bonded is fixed to the outer casing opening portion 102, so that it is formed thin. In the case of the lid body 105, the rigidity of the lid body 105 is insufficient, and it is difficult to hold the touch panel 104, and the thickness thereof is limited.

In addition, as another aspect of the display device with an input function, for example, the structure shown in FIG. 10 is known (for example, refer patent document 2). The belt The display device having an input function includes a display panel 110 such as a liquid crystal, a touch panel 111 disposed in front of the display panel 110, a lid 112 disposed in front of the touch panel 111, and a rear surface disposed on the rear side of the display panel 110. The backlight 113 and the outer casing 114 that house the touch panel 111, the display panel 110, and the backlight 113. In the case of the display device with an input function of such a configuration, the cover 112, the touch panel 111, the display panel 110, and the backlight 113 are respectively bonded to each other via the adhesive layer, so that the cover 112 is not required to be high. Rigid, the cover 112 can be formed thin.

[Prior patent documents]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2012-174053

[Patent Document 2] Japanese Patent Application Laid-Open No. 2013-8225

As described above, in the case of the display device with an input function shown in FIG. 10, the thickness of the lid body 112 can be reduced, but it is difficult to reduce the thickness of the adhesive layer so as to perform the entire display device with an input function. The problem of further thinning. Specifically, in the case of the display device with an input function shown in FIG. 10, the display panel 110 and the touch panel 111 are bonded to each other by the adhesive layer 115 as shown in the enlarged cross-sectional view of FIG. 11, but this At this time, the adhesive layer 115 is disposed on the entire front surface of the display panel 110, and the two are bonded together. Here, the display panel 110 has a laminated body structure in which various constituent elements such as a polarizing filter, a glass substrate, an alignment film, a liquid crystal, and a color filter are laminated in a layered manner by an adhesive layer, and in order to protect the circumferential surface of the laminated body, The lateral displacement of each component is prevented (preventing misalignment in a direction perpendicular to the stacking direction), and the display panel 110 is provided with a frame disposed along the entire circumference of the circumferential surface thereof or disposed on a part of the circumferential surface ( ) 116. The frame portion 116 is configured by, for example, a tape attached to the entire circumference or a part of the circumferential surface of the display panel 110, or a thin metal frame or a thin synthetic resin frame, and a part thereof is applied to the display panel 110. The peripheral portion of the surface is covered. When the adhesive layer 115 is disposed over the entire front surface of the display panel 110 thus configured, and the touch panel 111 is bonded, as shown in the enlarged cross-sectional view of FIG. 11, the periphery of the surface of the display panel 110 is covered. The adhesion strength between the display panel 110 and the adhesive layer 115, the adhesion between the adhesive layer 115 and the touch panel 111, and the height difference region 117 of the adhesive layer 115 formed between a portion of the portion 115 and the surface of the display panel 110 When the strength is lowered, there is a problem in that the adhesive layer 115 and the touch panel 111 are easily peeled off from the display panel 110. That is, if the thinning of the device is achieved by thinning the thickness of the adhesive layer 115, the risk of peeling between the display panel 110 and the adhesive layer 115, peeling between the adhesive layer 115 and the touch panel 110 is further increased. Since it is raised, it is difficult to take measures to reduce the thickness of the device by thinning the thickness of the adhesive layer 115.

The present invention has been made to solve such problems, and an object of the invention is to provide a display device with an input function that can be made thinner.

The above object of the present invention is achieved by a display device with an input function having a display panel and a frame covering at least a portion of a peripheral portion of a surface of the display panel as described below Display device of the portion, and the display surface is disposed on the display surface by means of an adhesive layer The touch panel on the front side of the board is disposed on a surface area of the display panel that is not covered by the frame portion, and the display panel and the touch panel are bonded together.

In addition, in the display device with an input function, the touch panel preferably has a peripheral portion of the touch panel opposite to the frame portion, and the frame portion and the peripheral portion of the touch panel are not attached to each other through the adhesive layer. Hehe.

Moreover, it is preferable to have an outer casing that accommodates the display panel and the laminated body of the touch panel, and the outer casing has a frame portion that is disposed to cover the peripheral edge portion of the touch panel.

Further, it is preferable to further include a lid body disposed in front of the touch panel, and the lid body is disposed inside the frame portion such that a peripheral end surface thereof faces the inner peripheral surface of the frame portion. Further, the lid may be configured to have a circularly polarizing plate.

According to the present invention, it is possible to provide a display device with an input function capable of achieving a reduction in thickness.

1‧‧‧Display device with input function

2‧‧‧Display device

3‧‧‧Touch panel

3a‧‧‧ Touch panel peripheral part

4‧‧‧ cover

4a‧‧‧The end face of the cover

5‧‧‧Outer casing

6a, 6b, 6c‧‧ ‧ adhesive layer

21‧‧‧ display panel

22‧‧‧Border Department

31‧‧‧1st transparent surface

32‧‧‧2nd transparent face

35‧‧‧Shade film

51‧‧‧Framework

51a‧‧‧The inner circumference of the frame department

311,321‧‧‧ Transparent substrate

312,322‧‧‧Touch electrode section

312a, 322a‧‧‧Rhombus electrode body

313,323‧‧‧ lead wiring

314‧‧‧1st wiring integration department

324‧‧‧2nd wiring integration department

W‧‧‧ gap

1 is a schematic cross-sectional view showing a display device with an input function according to an embodiment of the present invention.

Fig. 2 is a plan view showing a schematic configuration of a display device with an input function shown in Fig. 1;

3(a) to 3(c) are plan views showing various schematic configurations of a touch panel provided in the display device with an input function shown in Fig. 1.

4( a ) to 4 ( b ) are plan views showing a schematic configuration of a first transparent planar body and a second transparent planar body provided in the touch panel.

(a) to (b) of FIG. 5 are plan views showing a schematic configuration of a modification of the first transparent planar body and the second transparent planar body provided in the touch panel.

Fig. 6 is an enlarged cross-sectional view showing the main part of Fig. 1;

FIG. 7 is a perspective view showing a modification of the touch panel.

8 is a plan view showing a schematic configuration of a modification of the touch panel.

9 is a schematic cross-sectional view showing a conventional display device with an input function.

Fig. 10 is a schematic cross-sectional view showing another conventional display device with an input function.

Fig. 11 is an enlarged cross-sectional view showing the main part of Fig. 10;

Hereinafter, a display device 1 with an input function according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that, in order to facilitate understanding of the drawings, the respective drawings are not actually scaled, but are partially enlarged or reduced. 1 is a schematic cross-sectional view showing a display device 1 with an input function according to an embodiment of the present invention, and FIG. 2 is a plan view showing a schematic configuration of a display device 1 with an input function. As shown in FIGS. 1 and 2, the display device 1 with an input function according to an embodiment of the present invention includes a display device 2, a touch panel 3, a cover 4, and an outer casing 5. The display device 2 can The location where the user touches the input is detected as an input position.

The display device 2 is a device that displays an image, and for example, a device such as a liquid crystal display, a plasma display, or an organic EL display can be used. The display device 2 includes a display panel 21. In the use of liquid crystal display as a display In the case of the display device 2, the liquid crystal display panel corresponds to the display panel 21. When a plasma display is used as the display device 2, the plasma panel corresponds to the display panel 21. Further, in the case where an organic EL display is used as the display device 2, the organic EL panel corresponds to the display panel 21. In the case where a liquid crystal display is used as the display device 2, a backlight (not shown) is disposed on the rear side (lower side in the drawing) of the display panel 21.

Here, the display panel 21 is configured by laminating various members. For example, in the case of a liquid crystal display panel, for example, it has a structure in which a polarizing plate, a color filter layer, a liquid crystal layer, a TFT layer, a polarizing plate, or the like is laminated, and in the case of a plasma panel, for example, it has a back substrate and is formed. A glass plate having electrodes, a glass plate on which a phosphor layer is formed, a front substrate, and the like are laminated. In the case of an organic EL panel, for example, a glass substrate having a reflective electrode, an organic laminate film, a transparent electrode layer, a filler layer, a color filter layer, a black mask layer, and a glass layer are laminated. . In the display panel 21 having a laminated structure of such a wide variety of members, in order to protect the circumferential surface thereof and prevent lateral displacement of the respective constituent members (preventing misalignment in a direction perpendicular to the stacking direction), it is provided to surround the circumferential surface thereof. The frame portion 22 disposed on the entire circumference or disposed on a part of the circumferential surface. The frame portion 22 is configured by, for example, a belt body attached to the entire circumference or a part of the circumferential surface of the display panel 21, or a thin metal frame or a thin synthetic resin frame, and a part thereof covers the surface periphery of the display panel 21. Ministry.

The touch panel 3 is a capacitive touch panel and is formed in a plan view. It has a rectangular shape. The touch panel 3 is configured to have a touch panel peripheral edge portion 3a that faces the frame portion 22 of the display panel 21 in a state of being disposed at a predetermined position in front of the display panel 21. Further, the touch panel 3 has a first transparent planar body 31 and a second transparent planar body 32 as shown in a schematic cross-sectional view of FIG. 3(a). As shown in the plan view of FIG. 4(a), the first transparent planar body 31 has a transparent substrate 311, a plurality of touch electrode portions 312 formed by patterning the transparent substrate 311, and formed on the transparent substrate 311. A plurality of lead wires 313. Each of the lead wires 313 is electrically connected to each of the touch electrode portions 312 and is guided to one side edge 31a of the transparent substrate 311.

Similarly, as shown in the plan view of FIG. 4( b ), the second transparent planar body 32 includes a transparent substrate 321 , a touch electrode portion 322 formed by patterning the transparent substrate 321 , and a transparent electrode substrate 321 . A plurality of lead wires 323 are formed. Each of the lead wires 323 is electrically connected to each of the touch electrode portions 322, and is guided to one side edge 32a of the transparent substrate 321.

As shown in FIG. 3( a ), the first transparent planar body 31 and the second transparent planar body 32 are on the back side of the transparent substrate 311 of the first transparent planar body 31 (one surface side on which the touch electrode portion 312 is not formed) The touch electrode portions 322 of the second transparent planar body 32 are bonded to each other via the adhesive layer 6a. In addition, as shown in FIG. 3( b ), the first transparent planar body 31 and the second transparent planar body 32 can be bonded in such a manner that the respective touch electrode portions 312 and 322 face each other. As shown in FIG. 3( c ), the touch electrode portion 312 of the first transparent planar body 31 and the back surface side of the transparent substrate 321 of the second transparent planar body 32 may be formed (the touch electrode portion 322 is not formed). One side) is attached to each other. In addition, as the adhesive layer 6a, A transparent adhesive which is generally used, such as an epoxy type, an acrylic type, an anthraquinone type, and a polyurethane type, can be used, and the core material which consists of a transparent film of a polyester type resin can be contained. Further, the adhesive layer 6a can be formed by laminating a plurality of sheet-like adhesive materials, and further, a plurality of sheet-like adhesive materials can be stacked. Further, an ultraviolet curable resin such as an acrylic UV curable resin or a fluorene UV curable resin can be used. The thickness of the adhesive layer 6a is not particularly specified, but is practically preferably 15 μm to 175 μm.

The transparent substrates 311 and 321 have a high dielectric constant, and are preferably formed of a material having high transparency. Specifically, polyethylene terephthalate (PET), polyimine (PI), and poly are exemplified. Ethylene naphthalate (PEN), polyether oxime (PES), polyetheretherketone (PEEK), polycarbonate (PC), polypropylene (PP), polydecylamine (PA), polyacrylic acid (PAC) a flexible film such as an acrylic, an amorphous polyolefin resin, a cyclic polyolefin resin, an aliphatic cyclic polyolefin, or a norbornene-based thermoplastic transparent resin, or a laminate of two or more thereof Wait. The thickness of the transparent substrates 311 and 321 is preferably about 20 to 500 μm.

In addition, when the transparent substrates 311 and 321 are formed, an undercoat layer for improving transparency, adhesion, and the like may be provided on one surface side on which the touch electrode portions 312 and 322 are formed. As a material of the undercoat layer, a metal oxide such as cerium oxide, titanium oxide or tin oxide can be exemplified. A thin film layer containing such a metal oxide can be formed on the surfaces of the transparent substrates 311 and 321 by a sputtering method, a resistance vapor deposition method, an electron beam evaporation method, or the like to form an undercoat layer. Further, the undercoat layer may be formed by laminating two or more thin film layers having different refractive indices. Especially such as Japanese invention patents In the case of the undercoat layer having the refractive index matching function as described in JP-A-2010-208169, the portion having the transparent conductive film (touch electrode portions 312, 322) and the portion having no transparent conductive film Since the difference in optical characteristics is reduced, the visibility of the touch panel 3 is improved.

As shown in the plan views of FIGS. 4(a) and 4(b), each of the touch electrode portions 312 and 322 is formed in a rectangular strip shape extending in parallel with each other, and the strip-shaped touch electrode portions 312 and 322 are When the first transparent planar body 31 and the second transparent planar body 32 are stacked, they are arranged to be orthogonal to each other.

The pattern shape of the touch electrode portions 312 and 322 may be any shape as long as the contact point of the finger or the like can be detected. For example, as shown in the plan views of FIGS. 5( a ) and 5 ( b ), the touch electrode portions 312 and 322 are formed in a rhombic connecting strip shape in which a plurality of rhombic shapes are linearly connected, and the first transparent surface is formed. When the body 31 and the second transparent planar body 32 are stacked, the longitudinal direction of each of the touch electrode portions 312 and 322 may be orthogonal to each other, and the upper and lower rhombic electrode bodies 312a and 322a may not overlap each other in plan view. In the case of the operational performance such as the resolution of the touch panel 3, when the first transparent planar body 31 and the second transparent planar body 32 are superimposed, the presence of the touchless electrode portions 312 and 322 is reduced. The composition of the area is excellent. From such a viewpoint, as the pattern shape of the touch electrode portions 312 and 322, a rhombic connecting strip shape in which a plurality of rhombic shapes are linearly connected is more preferable than a rectangular strip shape shown in FIG. 4 .

The touch electrode portions 312 and 322 preferably contain a material having high transparency. Specifically, indium tin oxide (ITO: Indium Tin Oxide), indium oxide, antimony-added tin oxide, fluorine-added tin oxide, and aluminum are added. Oxygen Transparent conductive materials such as zinc, zinc oxide added with zinc, zinc oxide added with antimony, zinc oxide-tin oxide, indium oxide-tin oxide, zinc oxide-indium oxide-magnesium oxide, zinc oxide, tin oxide film, etc. Alternatively, a metal material such as tin, copper, aluminum, nickel or chromium or a metal oxide material may be formed by combining two or more of them. In addition, even a simple metal can be used as a conductive material.

In addition, ultrafine conductive carbon fibers such as carbon nanotubes, carbon nanohorns, carbon nanowires, carbon nanofibers, and graphite fibers, and extremely fine conductive fibers containing silver raw materials are dispersed in a polymerization function as a binder. The composite material is used as a composite material, and the composite material can be used as a material of the touch electrode portions 312 and 322. Here, as the polymer material, polyaniline, polypyrrole, polyacetylene, polythiophene, polyphenylenevinylene, polyphenylene sulfide, polyparaphenylene, polyheterocycle, poly(3) may be used. , Conductive polymer such as PEDOT: poly(3,4-ethylenedioxythiophene). It should be noted that the touch electrode portions 312 and 322 can be formed using such a conductive polymer monomer. In addition, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether oxime (PES), polyetheretherketone (PEEK), polycarbonate (PC) can be used. Non-conductive polymerization of polypropylene (PP), polyamide (PA), acrylic, polyimine, epoxy resin, phenolic resin, aliphatic cyclic polyolefin, norbornene-based thermoplastic transparent resin Things.

The method of forming the touch electrode portions 312 and 322 may, for example, be a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method, a CVD method, a coating method, or a printing method. In addition, there is no special thickness of the touch electrode portions 312 and 322. In the case where the ITO film is formed by sputtering, for example, when the visibility is improved, it is preferably 60 nm or less, and more preferably 40 nm or less. In addition, when the film thickness is 5 nm or less, it is difficult to form a continuous film, and it is difficult to form a stable conductive layer. Further, when the resistance of the touch electrode portions 312 and 322 is reduced, the thickness is preferably 30 nm or more.

Regarding the pattern formation of the touch electrode portions 312 and 322, a mask portion having a desired pattern shape is formed on the surface of the conductive layer formed on the transparent substrates 311 and 321 respectively, and the exposed portion is etched away by an acid solution or the like. The mask portion is dissolved by an alkaline liquid or the like.

The lead wires 313 and 323 electrically connected to the touch electrode portions 312 and 322 are configured to conduct the touch signals detected by the touch electrode portions 312 and 322 to the outside through a flexible wiring board (not shown). Touch position identification circuit (not shown).

As shown in the plan view of FIG. 4(a), one end 313a of each lead wiring 313 is separately connected to the end of each touch electrode portion 312, and the other end 313b is disposed in the vicinity of one side edge 31a of the transparent substrate 311. The other end 313b of each of the lead wires 313 disposed in the vicinity of one side edge 31a of the transparent substrate 311 is integrated into a bundle at a predetermined interval to form the first wiring integrating portion 314.

Similarly, as shown in the plan view of FIG. 4(b), one end 323a of each of the lead wires 323 in the second transparent planar body 32 is separately connected to the end of each touch electrode portion 322, and the other end 323b is disposed at the other end. The vicinity of one side edge 32a of the transparent substrate 321. Each of the lead wires 323 is configured to be wound around the periphery of the transparent substrate 321 with one end 323a as a starting point and guided to the transparent substrate 321 Near the side edge 32a. The other end 323b of each lead wiring 323 disposed in the vicinity of one side edge 32a of the transparent substrate 321 is bundled at a predetermined interval to form a second wiring integrating portion 324.

When the first transparent layered body 31 and the second transparent planar body 32 are stacked to form the touch panel 3, the first wiring integrated portion 314 and the second wiring integrated portion 324 are in a plan view of the touch panel 3. Next, they are configured to be adjacent to each other in the vicinity of the same one side edge of the touch panel 3. The first wiring integration unit 314 and the second wiring integration unit 324 are electrically connected to the terminals of the flexible wiring board (not shown), and the touch signals detected by the touch electrode portions 312 and 322 are guided and arranged. External touch position identification circuit (not shown). It should be noted that the flexible wiring board is led out toward the rear side of the display device 2.

As a method of forming the lead wires 313 and 323, various methods can be employed. For example, (A) a method of screen printing a conductive paste containing conductive particles of a metal such as silver on the transparent substrates 311 and 321; (B) laminating a metal foil such as copper on the transparent substrates 311 and 321 A method of forming a resist pattern on a metal foil and etching the metal foil (refer to Japanese Laid-Open Patent Publication No. 2008-32884, etc.). Further, the same materials (indium tin oxide (ITO)) as those of the above-described touch electrode portions 312 and 322 can be used, and the lead wires 313 and 323 can be formed by a sputtering method or the like. In addition, it can also print polyaniline, polypyrrole, polyacetylene, polythiophene, polyphenylene vinylene, polyphenylene sulfide, polyparaphenylene, polyheterocycle, poly(3,4-ethylenedioxy Conductive polymer such as PEDOT: poly(3,4-ethylenedioxythiophene) (conductivity) The lead wires 313 and 323 are formed by the polymer.

The conductive particles in the formation method of the above (A) include fine particles containing silver as a main component. Further, for example, fine particles containing gold, silver, copper, an alloy of gold and silver, an alloy of gold and copper, an alloy of silver and copper, and an alloy of gold and silver and copper may be used. Further, it may be indium tin oxide (ITO), a conductive oxide (IZO (indium zinc oxide)) in which zinc oxide is mixed with indium oxide, or a conductive oxide in which cerium oxide is mixed in indium oxide ( ITSO) is a component of the main component. Further, as the conductive particles, fine particles such as metal nanowires such as silver, carbon nanotubes, and graphene can be used.

The touch panel 3 having such a configuration is bonded to the front surface of the display panel 21 via the adhesive layer 6b, and the adhesive layer 6b is configured to be disposed on the display not covered by the frame portion 22 as shown in an enlarged cross-sectional view of a main portion of FIG. The display panel 21 and the touch panel 3 are attached to a predetermined area of the panel 21. That is, the adhesive layer 6b is disposed at a position that is not superimposed on the frame portion 22 on the surface of the display panel 21, and the frame portion 22 and the touch panel peripheral edge portion 3a are not bonded to each other by the adhesive layer 6b. More specifically, for example, when the frame portion 22 covers the entire circumference of the peripheral surface portion of the surface of the display panel 21, the adhesive layer is disposed inside the frame portion 22 disposed on the surface of the display panel 21.

As the adhesive layer 6b, a transparent adhesive which is generally used, such as an epoxy type, an acrylic type, an anthraquinone type, and a urethane type, can be used, and a core material which consists of a transparent film of a polyester type resin can be contained. Further, the adhesive layer 6b can be formed by laminating a plurality of sheet-like adhesive materials, and further, a plurality of sheet-shaped adhesive materials can be stacked. In addition, an acrylic UV curable resin can be used, An ultraviolet curable resin such as a UV curable resin. The thickness of the adhesive layer 6b is not particularly specified, but may be set to a thickness equal to or higher than the height of the frame portion 22 covering the display surface of the display panel 21, and more preferably set between the frame portion 22 and the touch panel peripheral edge portion 3a. A thickness such as the gap W is formed. Specifically, for example, the thickness of the adhesive layer 6b is preferably set to a range of about 100 μm to 350 μm, and the gap W is preferably set such that the distance between the frame portion 22 and the touch panel 3 is, for example, 10 μm or more and 100 μm or less.

The cover 4 is a transparent film member having a function of protecting the touch panel 3 and is disposed in front of the touch panel 3. The exposed surface of the cover 4 constitutes a touch surface for touch operation. The lid body 4 is formed in a rectangular shape in plan view, and is bonded to the touch panel 3 via the adhesive layer 6c in comparison with the inner side region of the peripheral edge portion of the touch panel 3. That is, the cover 4 is disposed in front of the touch panel 3 so that the surface of the touch panel 3 is exposed between the periphery of the cover 4 and the periphery of the touch panel 3. Further, the lid body 4 is disposed inside the frame portion 51 so that the circumferential end surface thereof faces the inner circumferential surface of the frame portion 51 in the outer casing 5 to be described later.

The cover 4 is made of, for example, polyethylene terephthalate (PET), polyimine (PI), polyethylene naphthalate (PEN), polyether oxime (PES), polyetheretherketone ( A flexible film made of synthetic resin such as PEEK), polycarbonate (PC), polypropylene (PP), polyamine (PA), or acrylic (polymethyl methacrylate: PMMA) is formed. It should be noted that a hard coat layer or the like may be provided on the surface of these films. In addition, the lid body 4 can be configured by two or more of these laminates. As the cover 4 having a laminated structure, it is preferably A laminate film (PMMA/PC/PMMA film) in which an acrylic film is formed on both sides of a film made of polycarbonate (PC), and a laminate of a polycarbonate (PC) film on one side of an acrylic film is used. Membrane (PMMA/PC film). Here, the thickness of the lid body 4 is preferably 150 μm or more and 800 μm or less, and more preferably 200 μm or more and 500 μm or less.

Further, the lid body 4 may be configured as a circularly polarizing plate having a full surface bonded to a linear polarizing plate and a λ/4 phase difference plate. The linear polarizing plate can be exemplified by a stretched film of polyvinyl alcohol (PVA) in which a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented, and triacetin acetate as a protective film can be used. TAC) A member in which a film is bonded to the both sides of the film. The λ/4 phase difference plate can be obtained by stretching a film of a polyvinyl alcohol (PVA), a polycarbonate (PC), a norbornene-based thermoplastic resin, a cyclic polyolefin resin, or the like to impart birefringence. Components. In the case where the lid body 4 has a circularly polarizing plate, the λ/4 phase difference plate is disposed on the touch panel 3 side. Further, in the case where the lid body 4 has a circularly polarizing plate, the transparent substrates 311 and 321 of the touch panel 3 are preferably formed of an optically isotropic material. The optically isotropic material is a material that does not have polarization for all incident light, and examples thereof include polycarbonate (PC), polyether oxime (PES), polyacrylic acid (PAC), and amorphous polyolefin resin. A cyclic polyolefin resin, an aliphatic cyclic polyolefin, a norbornene-based thermoplastic transparent resin, a glass material, or the like. As a method of forming the transparent substrates 311 and 321 using these materials, a method of so-called casting or extrusion can be used.

Thus, by making the cover 4 circularly polarized, it is possible to reduce the The reflected light of the material interface or the like inside the touch panel 3 can provide good low reflectivity, and the visibility of an image or the like displayed on the display panel 21 can be further improved.

In addition, as the adhesive layer 6c existing between the lid body 4 and the touch panel 3, a commonly used transparent adhesive such as an epoxy resin, an acrylic resin, a lanthanoid resin or a polyurethane resin may be used, and a polyester resin may be contained. The core material formed by the transparent film. Further, a plurality of sheet-like adhesive materials may be stacked to form an adhesive layer 6c, and further, a plurality of sheet-like adhesive materials may be stacked. Further, an ultraviolet curable resin such as an acrylic UV curable resin or a fluorene UV curable resin can be used. The thickness of the adhesive layer 6c is not particularly specified, but is practically preferably 15 μm to 175 μm.

The outer casing 5 is an outer casing that houses the stacked body formed by the display device 2, the touch panel 3, and the lid 4. The outer casing 5 may be in any form as long as it can house the display device 2, the touch panel 3, and the like. In the present embodiment, the outer casing 5 is formed into an approximately rectangular parallelepiped having a substantially rectangular planar shape. Further, the outer casing 5 having an approximately rectangular parallelepiped shape is provided with an opening, and the frame portion 51 is provided at the opening. The frame portion 51 is formed to cover the entire area of the peripheral edge portion 3a of the touch panel 3. Further, the frame portion 51 is formed such that its inner peripheral surface 51a faces the peripheral end surface 4a of the above-described lid body 4, and the surface 51b of the frame portion 51 and the surface 4b of the lid body 4 are formed substantially on one surface.

In the display device 1 with an input function having the above configuration, the device user views the image displayed on the display surface (display panel) of the display device 2 by the touch panel 3 and the cover 4, Side to side The surface of the cover 4 is touch input. Therefore, the touch electrode portions 312 and 322 of the touch panel 3 are grounded at the touch position by the electrostatic capacitance of the human body, and the change of the current value flowing through the touch electrode portions 312 and 322 is detected. To calculate the coordinates of the touch position.

As shown in FIG. 6, the display device 1 with an input function according to the present invention is configured such that an adhesive layer 6b is disposed in a predetermined region of the display panel 21 that is not covered by the frame portion 22, and the display panel 21 and the touch panel are disposed. The panel 3 is attached. Therefore, the adhesion region formed between the portion of the frame portion 22 that covers the peripheral edge portion of the display panel 21 and the surface of the display panel 21 that has occurred in the past is not formed (see FIGS. 6 and 10). The adhesive strength between the display panel 21 and the adhesive layer 6b, and the adhesive strength between the adhesive layer 6b and the touch panel 3 can be effectively prevented from being lowered. In other words, even if the thickness of the adhesive layer 6b is thinly formed, the occurrence of peeling between the display panel 21 and the adhesive layer 6b, and the occurrence of peeling between the adhesive layer 6b and the touch panel 3 can be suppressed as a result. It is possible to reduce the thickness of the display device 1 with an input function by thinly forming the thickness of the adhesive layer 6b.

In addition, as shown in FIG. 11 showing a conventional example, when the adhesive layer 115 is disposed on the entire front surface of the display panel 110 including the frame portion, and the display panel 110 and the touch panel 111 are bonded together, in order to avoid the difference region In the gas nip in 117 (bubble generation), it is necessary to set the thickness of the adhesive layer 115 to a thickness of about 2 to 3 times the height of the height difference region 117, but in the case of the present invention, as shown in FIG. There is no adhesion region between the portion of the frame portion 22 that covers the peripheral edge portion of the surface of the display panel 21 and the surface of the display panel 21, so there is no It is necessary to set the thickness of the adhesive layer 6b to a large extent in order to prevent gas from entering in the place, and it is possible to reduce the thickness of the entire display device 1 having an input function.

Further, as described above, the display device 1 with an input function according to the present invention does not form a part of the frame portion 22 that has been conventionally applied to cover the peripheral edge portion of the surface of the display panel 21 and the display panel 21 as described above. A high-low gap bonding area formed between the surfaces. In the conventional case, the touch panel 3 and the lid body 4 are deformed in the vicinity of the step portion due to the presence of the gap portion (high and low difference portion) having a difference in height, and the deformation is affected by the deformation. The touch panel 3 and the cover 4 are deformed by the peripheral region of the image displayed by the user of the device. On the other hand, in the case of the display device 1 with an input function according to the present invention, since there is no gap region in which the difference is high, the image displayed by the user of the device is not deformed, and extremely excellent recognition can be obtained. Sex.

In addition, as shown in FIG. 6 , the touch panel 3 has a touch panel peripheral edge portion 3 a opposite to the frame portion 22 , and is configured as a frame portion 22 and a peripheral portion of the touch panel. 3a does not adhere to each other without the aid of the adhesive layer 6b. In other words, the touch panel peripheral edge portion 3a is configured to float relative to the frame portion 22. Here, as described above, the peripheral portion of the touch panel 3 is connected to the flexible wiring board, but the flexible wiring board is bent toward the rear side of the display panel 21 (display device 2) and is taken out. The bending of the flexible wiring board may cause peeling of the flexible wiring board at the connection place of the flexible wiring board and the touch panel 3. In this regard, the touch panel peripheral portion 3a is floated relative to the frame portion 22 as in the present invention. In a state where the connection between the flexible wiring board and the touch panel 3 acts to peel the flexible wiring board, the floating touch panel peripheral edge portion 3a absorbs a part of the force, which can effectively prevent The flexible wiring board is peeled off from the touch panel 3. In particular, a gap W is formed between the frame portion 22 that covers the peripheral edge portion of the surface of the display panel 21 and the touch panel peripheral portion 3a that faces the surface 22a of the frame portion 22, and the touch panel peripheral portion 3a is formed. The deflection of the flexible wiring board is further improved, and the peeling of the flexible wiring board from the touch panel 3 can be prevented extremely effectively, and the display device with an input function can be prevented. The durability of 1 is improved.

One embodiment of the present invention has been described above, but the specific mode of the present invention is not limited to the above embodiment. In the above-described embodiment, the touch panel 3 provided in the display device 1 with an input function is configured to superpose the first transparent planar body 31 and the second transparent planar body 32. However, the first transparent surface may be omitted. The touch panel 3 is configured by either the planar body 31 or the second transparent planar body 32. In addition, the touch electrode portion 312 may be formed on one surface side of the transparent substrate 311, and the touch electrode portion 322 may be formed on the other surface side to constitute the touch panel 3. Further, as shown in the perspective view of FIG. 7, the second transparent planar body 32 can be omitted, and both the touch electrode portion 312 and the touch electrode portion 322 can be formed on one surface side of the transparent substrate 311 of the first transparent planar body 31. In the case where the touch panel 3 is configured as described above, the portions where the touch electrode portion 312 and the touch electrode portion 322 overlap each other are formed. However, by having the insulating portion 350 interposed therebetween, the touch electrode portion 312 can be prevented. The conduction of the touch electrode portion 322 can maintain the function as the touch panel 3.

In addition, as for the configuration of each touch panel 3, the touch electrode portion 312 (touch electrode portion 322) is formed in a strip shape, for example, as shown in FIG. The touch electrode portion 312 is formed in an island shape. When the touch electrode portion 312 is configured in an island shape as described above, each of the touch electrode portions 312 is connected to the lead wiring 313, and a part of the lead wiring 313 is disposed to pass between the touch electrode portions 312. In addition, as shown in FIG. 8, when the touch electrode portion 312 is formed in an island shape and the touch electrodes 312 are connected to the lead wires 313, respectively, only the touch electrodes are provided. The first transparent planar body 31 of the portion 312 has a function as the touch panel 3 .

Further, in the above-described embodiment, each of the touch electrode portions 312 and 322 included in the touch panel 3 is formed of a conductive film such as an ITO film. For example, the touch lines may be formed in a mesh shape to constitute each touch. Specific examples of the electrode portions 312 and 322 as the mesh shape include a shape in which the metal wires are in a lattice shape. In the lattice shape, the metal wires may be arranged in parallel with the respective sides of the transparent substrates 311 and 321 to form a lattice shape, and the metal wires may be arranged so as to be inclined by a predetermined angle with respect to each side of the transparent substrates 311 and 321 . Grid-like shape. The metal wires are extremely thin wires, and the metal wires are arranged at substantially equal intervals to each other. The line width of the metal wire is preferably in the range of 3 μm to 50 μm, particularly preferably in the range of 4 μm to 30 μm. Further, the interval between the adjacent metal wires is preferably in the range of 100 μm to 1000 μm.

Further, in the above embodiment, each of the touch electrode portions 312 and 322 and the lead wires 313 and 323 may be formed of a metal thin film such as copper or silver. In the case of adopting such a configuration, it can be configured as a touch electrode At least a part of the portions 312 and 322 has a mesh shape. When the touch electrodes 312 and 322 and the lead wires 313 and 323 are formed of a metal thin film, the touch electrode portions 312 and 322 and the lead wires 313 and 323 can be formed at the same time, which can improve manufacturing. Workability and can reduce manufacturing costs. In addition, the appearance of the touch panel 3 can be made good. In addition, as a method of forming the touch electrode portions 312 and 322 and the lead wires 313 and 323 by the metal thin film, as described above, a conductive paste containing conductive particles of a metal such as silver may be screen printed on the transparent substrate. The method of 311 and 321, the method of laminating the metal foil of copper, etc. on the transparent substrates 311 and 321, and forming a resist pattern on the metal foil, and etching the metal foil.

Further, in the above embodiment, the touch panel 3 is of a capacitive type, but for example, a resistive film type touch panel can be used. The touch position detecting method in the resistive film type touch panel is the same as the conventional resistive film type touch panel, and the touch electrode portion 312 and the touch electrode are pressed by pressing any position of the cover 4 with a finger or the like. The portion 322 is in contact, and the resistance value of the contact is measured in the lateral direction and the longitudinal direction, thereby calculating the coordinates of the contact position.

1‧‧‧Display device with input function

2‧‧‧Display device

3‧‧‧Touch panel

3a‧‧‧ Touch panel peripheral part

4‧‧‧ cover

5‧‧‧Outer casing

21‧‧‧ display panel

22‧‧‧Border Department

51‧‧‧Framework

W‧‧‧ gap

Claims (6)

A display device with an input function, comprising: a display panel; and a frame portion covering at least a portion of a peripheral portion of a surface of the display panel; and a touch panel disposed on the bonding layer a front surface of the display panel; wherein the adhesive layer is disposed on a surface area of the display panel that is not covered by the frame portion, and the display panel and the touch panel are bonded together. The display device with an input function of claim 1, wherein the touch panel has a peripheral portion of the touch panel opposite to the frame portion, and the frame portion and the peripheral portion of the touch panel are not pasted by the adhesive layer Hehe. A display device with an input function according to claim 1, wherein a gap is formed between the frame portion and the peripheral portion of the touch panel. The display device with an input function according to any one of claims 1 to 3, further comprising an outer casing for housing the display panel and the laminated body of the touch panel, the outer casing having the outer cover covering the touch panel The frame part of the peripheral part of the way. A display device with an input function according to claim 4, further comprising a cover disposed in front of the touch panel, wherein the cover is disposed such that a peripheral end surface thereof faces the inner peripheral surface of the frame portion The inside of the frame portion. A display device with an input function according to claim 5, wherein the cover has a circularly polarizing plate.