JP2013045155A - Input unit, display unit, and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input unit, a display unit, and a device having improved reliability.SOLUTION: An input unit X1 includes: a substrate 2 that is rectangular in a plan view; plural detection electrodes 3a and 4a provided on the substrate 2; electrode wiring 9 provided on the substrate 2 and disposed on an outer side of the plural detection electrodes 3a and 4a; a shield layer 14 provided on the substrate 2 and covering the plural detection electrodes 3a and 4a in a plan view; and conduction parts 15 where the electrode wiring 9 and the shield layer 14 are electrically connected to each other. The conduction parts 15 are provided on portions other than corner portions R1 of the substrate 2.

Description

  The present invention relates to an input device, a display device, and a device that detect, for example, a position input by a user as an input position.

  As an input device, for example, a capacitive touch panel that detects a change in capacitance between a finger and a detection electrode and detects an input position is known (see, for example, Patent Documents 1 and 2). . In such an input device, a shield layer for shielding noise generated by the display panel is provided on a surface facing the display panel (see, for example, Patent Document 3). This shield layer is electrically connected to electrode wiring provided on the base of the input device in order to set it to the ground potential.

JP 2008-97283 A JP 2008-310551 A JP 2001-325070 A

  The substrate in the above input device may cause thermal shrinkage depending on the use environment. When thermal contraction occurs in the substrate, it may be greatly deformed around the corner of the substrate. For this reason, depending on the position where the conductive portion in which the electrode wiring and the shield layer are electrically connected is provided, a crack or the like may occur in the conductive portion, which may reduce the reliability of the input device.

  The present invention has been made in view of the above-described problems, and an object thereof is related to an input device, a display device, and a device with improved reliability.

  One aspect of the input device according to the present invention includes a base having a rectangular shape in plan view, a plurality of detection electrodes provided on the base, the plurality of detection electrodes provided on the base. An electrode wiring located on the outside of the substrate, a shield layer that is provided on the base and covers the plurality of detection electrodes in plan view, and the electrode wiring and the shield layer are electrically connected. And the conducting portion is provided on a portion other than the corner portion of the base body.

  One aspect of the display device of the present invention includes the input device according to the present invention, a display panel arranged to face the input device, and a first housing in which the display panel is accommodated.

  One aspect of the device of the present invention includes the display device according to the present invention in the second housing.

  The input device, the display device, and the device of the present invention have an effect that reliability is improved.

It is a top view which shows schematic structure of the input device which concerns on this embodiment. It is a top view which shows schematic structure of said input device, Comprising: It is the figure which saw through the base | substrate. It is a top view which shows schematic structure of said input device, Comprising: It is the figure seen from the opposite side to FIG. It is sectional drawing cut | disconnected along the cutting line II shown in FIG. It is sectional drawing cut | disconnected along the cutting line II-II shown in FIG. It is sectional drawing cut | disconnected along the cutting line III-III shown in FIG. It is sectional drawing which shows schematic structure of the display apparatus which concerns on this embodiment. It is a perspective view which shows schematic structure of the portable terminal which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  However, for convenience of explanation, the drawings to be referred to below show simplified main members necessary for explaining the present invention, among the constituent members of one embodiment of the present invention. Therefore, the input device, the display device, and the device according to the present invention may include arbitrary constituent members that are not shown in the drawings referred to in this specification.

As shown in FIGS. 1 and 2, the input device X1 according to the present embodiment is a capacitive touch panel, and includes an input area E _I that can be input by a user, and an outside of the input area E _I. And an outer region _EO located at the same position.

  As shown in FIGS. 1 to 6, the input device X <b> 1 includes a base 2.

Base 2, the first detection electrode 3a to be described later in the input region E _I, the first connection electrode 3b, the second detection electrode 4a, and it takes a roll for supporting the second connection electrode 4b, described later in the outer region E _O It is a member that plays a role of supporting the wiring conductor 8 and the electrode wiring 9. The base 2 has an operation surface 2a and a back surface 2b located on the opposite side of the operation surface 2a.

  The base body 2 is configured to be able to appropriately transmit light in a direction intersecting the operation surface 2a and the back surface 2b, and to have an insulating property. Examples of the constituent material of the substrate 2 include those having translucency such as transparent glass or transparent plastic, among which transparent glass is preferable from the viewpoint of visibility. In addition, in this specification, translucency means having transparency with respect to visible light. Moreover, although the planar view shape of the base | substrate 2 which concerns on this embodiment is made into the rectangular shape in which corner R1 is rounded, it is not restricted to this. The corner R1 may not be rounded.

As shown in FIGS. 2, 4, and 5, the first detection electrode 3 a, the first connection electrode 3 b, the second detection electrode 4 a, and the second detection electrode 3 a are formed on the back surface 2 b of the base 2 corresponding to the input region E _I A connection electrode 4b and an insulator 5 are provided.

First detection electrode 3a is finger F1 of the user close to the input region E _I, are those having a role to detect the input position in the Y direction, the ability to generate an electrostatic capacitance between the finger F1 have. That is, a plurality of the first detection electrodes 3a are provided on the back surface 2b of the base 2 with a predetermined interval along the X direction. Here, from the viewpoint of improving the detection sensitivity, the first detection electrode 3a according to the present embodiment has a substantially rhombus shape in plan view, but is not limited thereto.

  The first connection electrode 3b is a member that plays a role of electrically connecting the adjacent first detection electrodes 3a. The first connection electrode 3 b is provided on the back surface 2 b of the base 2.

Second detection electrode 4a is a finger F1 of the user close to the input region E _I, are those having a role to detect the input position in the X direction, the ability to generate an electrostatic capacitance between the finger F1 have. That is, a plurality of second detection electrodes 4a are provided on the back surface 2b of the base 2 with a predetermined interval along the Y direction. Here, from the viewpoint of improving detection sensitivity, the second detection electrode 4a according to the present embodiment has a substantially rhombus shape in plan view, but is not limited thereto.

  The second connection electrode 4b is a member that plays a role of electrically connecting the adjacent second detection electrodes 4a. The second connection electrode 4b is provided on the insulator 5 so as to straddle the insulator 5 so as to be electrically insulated from the first connection electrode 3b. Here, the insulator 5 is provided on the back surface 2b of the base 2 so as to cover the first connection electrode 3b. Examples of the constituent material of the insulator 5 include an acrylic resin, an epoxy resin, a silicone resin, silicon dioxide, or silicon nitride.

  Examples of the constituent material of the first detection electrode 3a, the first connection electrode 3b, the second detection electrode 4a, and the second connection electrode 4b include a light-transmitting conductive member. As the conductive member having translucency, for example, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ATO (Antimony Tin Oxide), AZO (Al-Doped Zinc Oxide), tin oxide, zinc oxide, or conductive A functional polymer.

Further, as shown in FIG. 6, the light shielding film 6, the first insulating film 7, the wiring conductor 8, the electrode wiring 9, and the second insulating film 10 are formed on the back surface 2 b of the base 2 corresponding to the outer region _EO. Is provided.

The light shielding film 6 is a member that plays a role of decorating the outer region _EO of the input device X1 in black, for example. In the present embodiment, the light-shielding film 6 is provided in a frame shape so as to surround the input region E _I. Since the light shielding film 6 is provided in a frame shape, the design of the input device X1 can be improved. Examples of the constituent material of the light shielding film 6 include a resin material containing carbon, chromium oxide, or titanium oxide. Examples of the method for forming the light shielding film 6 include a screen printing method, an ink jet method, a sputtering method, and a vapor deposition method.

The first insulating film 7 is a member that protects the light shielding film 6 and insulates the light shielding film 6 from the wiring conductor 8 and the light shielding film 6 from the electrode wiring 9 in the outer region _EO . Therefore, the first insulating film 7 is provided on the light shielding film 6 so as to cover the light shielding film 6. Examples of the constituent material of the first insulating film 7 include acrylic resin, epoxy resin, silicon dioxide, and the like. Examples of the method for forming the first insulating film 7 include a transfer printing method, a spin coating method, and a slit coating method.

  The wiring conductor 8 is a member that plays a role for applying a voltage to the first detection electrode 3a and the second detection electrode 4a. As shown in FIG. 2, one end of the wiring conductor 8 is electrically connected to the first detection electrode 3a and the second detection electrode 4a, and the other end is located in the external conduction region G1. For example, a flexible substrate (not shown) is connected to the external conduction region G1. Further, the wiring conductor 8 is provided on the light shielding film 6 via the first insulating film 7. That is, the light shielding film 6 is provided so as to cover the wiring conductor 8 and the electrode wiring 9 in a plan view. For this reason, the light shielding film 6 can reduce the possibility that the wiring conductor 8 and the electrode wiring 9 are visually recognized by the user.

The electrode wiring 9 is a member that plays a role of shielding noise from the outside. That is, the electrode wiring 9 is a member that plays a role for reducing the influence of noise from the outside on the wiring conductor 8 and the detection electrodes 3a and 4a. For this reason, the electrode wiring 9 is located outside the wiring conductor 8 and the detection electrodes 3a and 4a as shown in FIG. More specifically, as in this embodiment, the electrode wiring 2 is preferably provided so as to surround the wiring conductor 8 and the detection electrodes 3a and 4a in plan view. When the electrode wiring 2 is provided so as to surround the wiring conductor 8 and the detection electrodes 3a and 4a in plan view, when the input device X1 is provided in, for example, a display device Y1 and a portable terminal P1 described later, the display device It becomes possible to more reliably reduce the influence of noise from the outside such as electronic components mounted on Y1 and the portable terminal P1. In this specification, “surrounding the wiring conductor 8 and the detection electrodes 3a, 4a” does not require the electrode wiring 2 to completely surround the wiring conductor 8 and the detection electrodes 3a, 4a. As shown in the drawing, it also means that the wiring conductor 8 and the detection electrodes 3a and 4a are surrounded by the electrode wiring 2 and the external conduction region G1. Further, one end and the other end of the electrode wiring 9 are located in the external conduction region G1. The electrode wiring 9 is preferably set to a reference potential, particularly a ground potential.

  For example, the wiring conductor 8 and the electrode wiring 9 are made of a metal thin film so as to be hard and have high shape stability. Examples of the metal thin film include an aluminum film, an aluminum alloy film, a laminated film of a chromium film and an aluminum film, a laminated film of a chromium film and an aluminum alloy film, a silver film, a silver alloy film, or a gold alloy film. . Examples of the method for forming the metal thin film include a sputtering method, a vapor deposition method, and a chemical vapor deposition method.

The second insulating film 10 is a member that plays a role in protecting the wiring conductor 8 and the electrode wiring 9 in the outer region _EO . Therefore, the second insulating film 10 is provided on the first insulating film 7 so as to cover the wiring conductor 8 and the electrode wiring 9. As a constituent material of the second insulating film 10, for example, an acrylic resin, an epoxy resin, silicon dioxide, or the like can be used as in the first insulating film 7. Examples of the method for forming the second insulating film 10 include a transfer printing method, a spin coating method, and a slit coating method.

In addition, as shown in FIGS. 1, 2, 4 to 6, an operation surface protective film is provided on the operation surface 2 a of the base 2 corresponding to the input area E _I and the outer area E _O via an adhesive material 11. 12 is provided. Further, as shown in FIGS. 4 and 5, on the rear surface 2b of the substrate 2 corresponding to the input region E _I, back passivation film 13 is provided via the adhesive 11. Examples of the operation surface protection film 12 and the back surface protection film 13 include a polyester film, a polypropylene film, and a polyethylene film. Examples of the adhesive material 11 include an acrylic adhesive material, a silicone adhesive material, a rubber adhesive material, and a urethane adhesive material.

As shown in FIGS. 3 to 6, a shield layer 14 is provided on the back protective film 13 corresponding to the input region E _I and on the second insulating film 10 corresponding to the outer region E _O. . In the present embodiment, the shield layer 14 is provided on the entire back surface of the back protective film 13 and the entire back surface of the second insulating film 10. The shield layer 14 is a member that plays a role of shielding noise generated by the liquid crystal display panel 101 described later. That is, the shield layer 14 is a member that plays a role in reducing the influence of noise from the liquid crystal display panel 101 on the detection electrodes 3 a and 4 a and the wiring conductor 8.

  The shield layer 14 includes a base film 14a and a conductive member 14b. The base film 14a has an insulating property. Examples of the base film 14a include a polyester film, a polypropylene film, and a polyethylene film. The conductive member 14b is provided on the base film 14a. Examples of the conductive member 14b include ITO, IZO, ATO, AZO, tin oxide, zinc oxide, or a conductive polymer.

The conduction portion 15 is a member that plays a role for electrically connecting the electrode wiring 9 and the conductive member 14 b in the shield layer 14. In the present embodiment, as shown in FIG. 6, by forming a through hole T1 in the second insulating film 10 and the base film 14a, and forming a through conductor made of solder, silver paste or the like in the through hole T1, A conductive portion 15 is formed. Since the electrode wiring 9 and the conductive member 14b in the shield layer 14 are electrically connected by the conductive portion 15, the resistance value of the conductive member 14b can be lowered. As a result, noise generated by the liquid crystal display panel 101 can be shielded more efficiently.

  In addition, although the example which formed the conduction | electrical_connection part 15 by the penetration conductor was demonstrated above, it is not limited to this. The conductive portion 15 may be formed by forming a notch in the second insulating film 10 and the base film 14a and forming a conductor member made of solder, silver paste or the like in the notch.

  Here, the conduction portion 15 is provided on a portion other than the corner portion R1 of the base 2. Since the conductive portion 15 is provided on a portion other than the corner portion R1 of the base body 2, the possibility that a crack or the like is generated in the conductive portion 15 can be reduced even when the base body 2 is thermally contracted. it can.

  Specifically, when the input device X1 is used in a usage environment having a temperature difference such as day and night, the base 2 in the input device X1 may be thermally contracted. When thermal contraction occurs in the base 2, there is a possibility that the base 2 is largely deformed around the corner R <b> 1. On the other hand, in the input device X1 according to the present embodiment, the conduction portion 15 is provided on a portion other than the corner portion R1 of the base 2. For this reason, even if it is a case where heat shrinkage arises in the base | substrate 2, possibility that a crack etc. will arise in the conduction | electrical_connection part 15 can be reduced.

  In the present embodiment, the corner R1 of the base 2 is divided into eight equal intervals at the long side of the base 2 in plan view, and the short side of the base 2 is divided into eight at equal intervals in the plan view. Among the regions connecting the line perpendicular to the long side and the line perpendicular to the short side of the substrate 2, the region closest to the corner of the substrate 2 is meant.

  Moreover, as shown in FIG. 3, it is preferable that the conduction | electrical_connection part 15 is located in the center part C1 between the corner | angular parts R1 of the base | substrate 2. As shown in FIG. When the base 2 is thermally contracted, the corner R1 of the base 2 is most affected by the thermal contraction, and the central portion C1 positioned between the corners R1 of the base 2 is least affected by the thermal contraction. It will be. That is, the corner portion R1 of the base body 2 is most deformed, and the central portion C1 located between the corner portions R1 of the base body 2 is least deformed. For this reason, when the conduction | electrical_connection part 15 is located in the center part C1 between the corner | angular parts R1 of the base | substrate 2, possibility that a crack etc. will arise in the conduction | electrical_connection part 15 can be reduced more.

  In FIGS. 2 and 3, two conductive parts 15 are illustrated, but the present invention is not limited to this. If the conduction | electrical_connection part 15 is provided on parts other than corner R1 of the base | substrate 2, about the number of the conduction | electrical_connection parts 15, it will not specifically limit.

  Next, the detection principle of the input device X1 will be described.

When the finger F1, which is a conductor, approaches, touches, or presses the operation surface 2a of the base 2 corresponding to the input area E _I through the operation surface protection film 12, the finger F1 is positioned between the detection electrodes 3a and 4a. The capacitance changes. Here, the position detection driver (not shown) includes the finger F1 and the detection electrodes 3a,
The change of the electrostatic capacitance between 4a is always detected. When the position detection driver detects a change in capacitance that is equal to or greater than a predetermined value, the position detection driver detects a position where the change in capacitance is detected as an input position. In this way, the input device X1 can detect the input position. Note that the input device X1 may detect either the input position or the mutual capacitance method or the self-capacitance method. Employing the mutual capacitance method is preferable compared to the case of employing the self-capacitance method because a plurality of input positions can be detected simultaneously.

  As described above, the reliability of the input device X1 is improved.

  Next, a display device Y1 including the input device X1 will be described with reference to FIG.

  As shown in FIG. 7, the display device Y1 according to the present embodiment includes an input device X1 and a liquid crystal display device Z1 disposed to face the input device X1.

  The liquid crystal display device Z1 includes a liquid crystal display panel 101, a backlight 102, and a first housing 103.

  The liquid crystal display panel 101 is a display panel using a liquid crystal composition for display. Instead of the liquid crystal display panel 101, a display panel such as a plasma display, an organic EL display, or electronic paper may be used. The backlight 102 includes a light source 102a and a light guide plate 102b. The light source 102a is a member that plays a role of emitting light toward the light guide plate 102b, and includes, for example, an LED (Light Emitting Diode). Instead of the LED, a cold cathode fluorescent lamp, a halogen lamp, a xenon lamp, or an EL (Electro-Luminescence) may be used. The light guide plate 102b is a member that plays a role of guiding light from the light source 102a substantially uniformly over the entire lower surface of the liquid crystal display panel 101.

  The first housing 103 serves to accommodate the liquid crystal display panel 101 and the backlight 102, and includes an upper housing 103a and a lower housing 103b. Examples of the constituent material of the first housing 103 include a resin such as polycarbonate or a metal such as stainless steel or aluminum.

  Here, the input device X1 and the liquid crystal display device Z1 are bonded via a double-sided tape 104. That is, the input device X1 and the liquid crystal display device Z1 are bonded via the double-sided tape 104 so that the back surface 2b of the base 2 in the input device X1 is disposed to face the main surface of the liquid crystal display panel 101. Note that the fixing member used in the fixing method between the input device X1 and the liquid crystal display device Z1 is not limited to the double-sided tape 104. For example, an adhesive member such as a thermosetting resin or an ultraviolet curable resin, or the input device X1. And a fixed structure that physically fixes the liquid crystal display device Z1. Further, the input device X1 and the liquid crystal display device Z1 may be disposed in contact with each other or may be disposed with a gap therebetween.

Thus, the input device X1 while seeing through the liquid crystal display panel 101 of the liquid crystal display device Z1, by inputting operation of the input region E _I of the input device X1, it is possible to input various information. When inputting various types of information, the input device X1 may be provided with a function of presenting various tactile sensations such as a feeling of pressing, a feeling of tracing, and a feeling of touch to the user who has input the information. In this case, the base body 2 in the input device X1 includes one or more vibrating bodies (for example, piezoelectric elements), and when a predetermined input operation or a predetermined pressing load is detected, the vibrating body is detected at a predetermined frequency. It can be realized by vibrating.

  Since the display device Y1 includes the input device X1, the reliability is improved.

  Next, the portable terminal P1 provided with the display device Y1 will be described with reference to FIG.

As illustrated in FIG. 8, the mobile terminal P1 according to the present embodiment is a device such as a mobile phone, a smartphone, or a PDA, and includes a display device Y1, an audio input unit 201, and an audio output unit 20.
2, a key input unit 203, and a second housing 204.

  The voice input unit 201 is composed of, for example, a microphone or the like, and inputs a user's voice or the like. The audio output unit 202 includes a speaker or the like, and outputs audio from the other party. The key input unit 203 is configured by, for example, a mechanical key. The key input unit 203 may be an operation key displayed on the display screen. The second housing 204 is a member that plays a role of housing the display device Y <b> 1, the voice input unit 201, the voice output unit 202, and the key input unit 203.

  In addition, the mobile terminal P1 may include a short-distance wireless communication unit such as a digital camera function unit, a one-segment broadcasting tuner, an infrared communication function unit, and various interfaces, depending on the required functions. The detailed illustration and description thereof will be omitted.

  Since the portable terminal P1 includes the display device Y1, the reliability is improved.

  In addition, although the example which provided the audio | voice input part 201 in the portable terminal P1 was demonstrated above, it is not limited to this. That is, the voice input unit 201 may not be provided in the mobile terminal P1.

  Here, the display device Y1 is not limited to the portable terminal P1 described above, but various devices such as a programmable display, an electronic notebook, a personal computer, a copying machine, a game terminal device, a television, and a digital camera used for industrial purposes. The device may be provided.

X1 input device Y1 display device P1 portable terminal 2 substrate 3a first detection electrode (detection electrode)
4a Second detection electrode (detection electrode)
9 Electrode wiring 14 Shield layer 14a Base film 14b Conductive member 15 Conductive portion 101 Liquid crystal display panel (display panel)
103 1st housing | casing 204 2nd housing | casing R1 Corner of base | substrate

Claims (6)

A base having a rectangular shape in plan view;
A plurality of detection electrodes provided on the substrate;
An electrode wiring provided on the substrate and located outside the plurality of detection electrodes;
A shield layer provided on the substrate and covering the plurality of detection electrodes in plan view;
A conductive portion in which the electrode wiring and the shield layer are electrically connected, and
The conducting device is an input device provided on a portion other than a corner of the base.   The input device according to claim 1, wherein the conductive portion is located in a central portion between corner portions of the base body.   The input device according to claim 1, wherein the electrode wiring is provided so as to surround the plurality of detection electrodes in a plan view. The input device according to any one of claims 1 to 3,
A display panel disposed opposite the input device;
And a first housing in which the display panel is accommodated.   The display device according to claim 4, wherein the display panel is a liquid crystal display panel.   The apparatus provided with the display apparatus of Claim 4 or 5 in the 2nd housing | casing.

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