JP2012043362A - Display device with input function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with an input function capable of preventing reduction in detection sensitivity even when a vibrator is mounted on a substrate.SOLUTION: The display device with an input function X1 comprises: a touch panel 2; and a liquid crystal display panel 3 disposed opposite to the touch panel 2. The touch panel 2 includes: a substrate 20; detection electrodes 21a, 22a provided on a first main surface 20a of the substrate 20; and a vibrator 26 provided on the first main surface 20a of the substrate 20. The liquid crystal display panel 3 has a third main surface 31a facing the first main surface 20a of the substrate 20. A wiring 7 for the vibrator is provided on the third main surface 31a of the liquid crystal display panel 3. An electrode terminal 261 is provided on a back surface 26b of the vibrator 26. The electrode terminal 261 provided on the back surface 26b of the vibrator 26 and the wiring 7 for the vibrator provided on the third main surface 31a of the liquid crystal display panel 3 are electrically connected through an anisotropic conductive rubber 8.

Description

  The present invention relates to a display device with an input function, which includes a touch panel and a display panel arranged to face the touch panel.

  In recent years, in a display device with an input function provided with a touch panel, when a user presses the touch panel, a technology for transmitting a realistic pressing feeling similar to that when operating a push button switch to the pressed user. Is known (see, for example, Patent Document 1). In addition, among touch panels, capacitive touch panels are capable of multipoint input (multitouch), and have recently begun to be actively adopted in mobile terminals such as mobile phones and smartphones (for example, patents). Reference 2).

JP 2004-118754 A JP 2008-310551 A

  Incidentally, the capacitive touch panel has a function of detecting an input position by detecting a change in capacitance between a finger and a detection electrode. When the tactile transmission technology is applied to this capacitive touch panel, it is necessary to attach a vibrating body having electrode terminals to a substrate on which detection electrodes are provided. However, depending on the mounting position of the vibrator with respect to the base, stray capacitance may be generated between the electrode terminal of the vibrator and the detection electrode of the base, and the detection sensitivity of the touch panel may be reduced due to the generated stray capacitance. .

  The present invention has been made in view of the above-described problems, and an object thereof is to a display device with an input function that can suppress a decrease in detection sensitivity even when a vibrating body is attached to a base.

  One aspect of the display device with an input function according to the present invention is a display device with an input function including a touch panel and a display panel disposed to face the touch panel, the touch panel including a first main surface, and A substrate having a second main surface located on the opposite side of the first main surface, a detection electrode provided on the first main surface of the substrate, provided on the first main surface of the substrate, and A vibrating body that vibrates the base, wherein the display panel has a third main surface facing the first main surface of the base, and the vibrating body is disposed on the third main surface of the display panel. Wiring is provided, and the vibrating body has a facing surface facing the first main surface of the base body and a back surface located on the opposite side of the facing surface. An electrode terminal is provided, and an electrode terminal provided on the back surface of the vibrating body; Serial The third major surface on the vibrating-body wiring provided in the display panel are electrically connected through a conductive member.

  The display device with an input function of the present invention has an effect that it is possible to suppress a decrease in detection sensitivity even when a vibrating body is attached to a base.

It is a top view which shows schematic structure of the display apparatus with an input function which concerns on one Embodiment of this invention. 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. FIG. 4 is a cross-sectional view taken along a cutting line IV-IV shown in FIG. 1. It is a perspective view which shows the external appearance of a vibrating body. It is a top view which shows schematic structure of the display panel in a display apparatus with an input function. It is sectional drawing which shows the other example of the display apparatus with an input function, Comprising: It is sectional drawing which shows the same part as FIG. It is a flowchart which shows the operation example of the display apparatus with an input function. FIG. 6 is a cross-sectional view illustrating a schematic configuration of a display device with an input function according to a first modification, and is a cross-sectional view illustrating the same portion as FIG. It is sectional drawing which shows schematic structure of the display apparatus with an input function which concerns on the modification 2, Comprising: It is sectional drawing which shows the same part as FIG.

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

  However, in the drawings referred to below, for the convenience of explanation, among the constituent members of one embodiment of the present invention, only the main members necessary for explaining the present invention are shown in a simplified manner. Therefore, the display device with an input function 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 FIG. 1, the input function-equipped display device X1 according to this embodiment includes a display input region E _I capable of inputting displayed and information desired image, outside the display input region E _I And an outer region _EO located. As shown in FIG. 2, the display device with an input function X <b> 1 includes a touch panel 2, a liquid crystal display panel 3 disposed to face the touch panel 2, and a back for irradiating the liquid crystal display panel 3 with light. A light 4 and a housing 5 for housing the liquid crystal display panel 3 and the backlight 4 are provided. In the present embodiment, the touch panel 2 is a capacitive touch panel, but may be a resistive touch panel, a surface acoustic wave touch panel, an infrared touch panel, or an electromagnetic induction touch panel.

  As shown in FIGS. 1 to 5, the touch panel 2 includes a base body 20.

Substrate 20, the first detection electrode 21a to be described later in the display input region _{E I,} first connection electrode 21b, the second detection electrode 22a, and takes a roll for supporting the second connection electrode 22b, described later in the outer region _{E O} It is a member that plays a role of supporting the detection electrode wiring 24 to be performed. The base 20 has a first main surface 20a and a second main surface 20b located on the opposite side of the first main surface 20a. That is, the second main surface 20b of the substrate 20 corresponding to the display input region E _I becomes the surface that can be used to input information by pressing with a finger F1.

  The base body 20 is configured to be able to appropriately transmit light in a direction intersecting the first main surface 20a and the second main surface 20b, and to have an insulating property. Examples of the constituent material of the base body 20 include those having translucency such as transparent glass or transparent plastic. Among them, transparent glass is preferable from the viewpoint of visibility. In addition, in this specification, translucency means having transparency with respect to visible light.

As shown in FIGS. 1, 3 and 4, a first detection electrode 21 a, a first connection electrode 21 b, and a second detection are formed on the first main surface 20 a of the base 20 corresponding to the display input area E _I. An electrode 22a;
A second connection electrode 22b and an insulator 23 are provided.

First detection electrode 21a is a finger F1 of the user has approached the display input region E _I, (in the plane of FIG. 1 the left-right direction) the first direction are those having a role to detect the input position in the finger It has a function of generating a capacitance with F1. That is, the first detection electrodes 21a are provided on the first main surface 20a of the base body 20 at a predetermined interval along the second direction (vertical direction on the paper surface of FIG. 1).

  The second connection electrode 21b is a member that plays a role of electrically connecting the adjacent first detection electrodes 21a. The first connection electrode 21 b is provided on the first main surface 20 a of the base body 20.

Second detection electrode 22a is a finger F1 of the user has approached the display input region E _I, are those having a role to detect the input position in the second direction, generate an electrostatic capacitance between the finger F1 It has a function to do. That is, the second detection electrodes 22a are provided on the first main surface 20a of the base body 20 with a predetermined interval along the first direction.

  The second connection electrode 22b is a member that plays a role of electrically connecting the adjacent second detection electrodes 22a. The second connection electrode 22 b is provided on the insulator 23. Therefore, the second connection electrode 22b is electrically insulated from the first connection electrode 21b. Here, the insulator 23 is provided on the first main surface 20a of the base body 20 so as to cover the first connection electrode 21b. As a constituent material of the insulator 23, for example, a transparent resin such as an acrylic resin, an epoxy resin, or a silicone resin can be given.

  Examples of the constituent material of the first detection electrode 21a, the first connection electrode 21b, the second detection electrode 22a, and the second connection electrode 22b 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 Functional polymers (for example, PEDOT, PSS, etc.).

As shown in FIG. 5, the detection electrode wiring 24, the insulating member 25, and the vibrating body 26 are provided on the first main surface 20 a of the base body 20 corresponding to the outer region _EO .

  The detection electrode wiring 24 is a member that plays a role of applying a voltage to the first detection electrode 21a and the second detection electrode 22a. One end of the detection electrode wiring 24 is electrically connected to the first detection electrode 21a and the second detection electrode 22a, and the other end is located in the external conduction region G1. The external conduction region G1 is a region electrically connected to an FPC (Flexible Printed Circuit) or the like. For example, the detection electrode wiring 24 is 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 (CVD) method.

  The insulating member 25 is provided on the first main surface 20 a of the base body 20 so as to cover the detection electrode wiring 24. The insulating member 25 is a member that protects the detection electrode wiring 24 and plays a role for mounting the vibrating body 26. Examples of the constituent material of the insulating member 25 include a transparent resin such as an acrylic resin, an epoxy resin, or a silicone resin.

The vibrating body 26 is a member that plays a role of vibrating the base body 20 when a predetermined pressing load is detected. The vibrating body 26 according to the present embodiment is provided on the insulating member 25. In the present embodiment, the case where the vibrating body 26 is a piezoelectric element that vibrates based on an applied voltage will be described. Examples of the piezoelectric element include a bimorph type element in which piezoelectric layers and metal layers are alternately stacked.

  FIG. 6 is a perspective view showing the appearance of the vibrating body 26. As shown in FIGS. 5 and 6, the vibrating body 26 includes a facing surface 26 a that faces the first main surface 20 a of the base body 20, and a back surface 26 b that is located on the opposite side of the facing surface 26 a. The facing surface 26 a of the vibrating body 26 and the insulating member 25 are bonded to each other via an adhesive member 27. Examples of the constituent material of the adhesive member 27 include an acrylic adhesive, a rubber adhesive, or a urethane adhesive. An electrode terminal 261 is provided on the back surface 26 b of the vibrating body 26. The reason why the electrode terminal 261 is provided not on the facing surface 26a of the vibrating body 26 but on the back surface 26b of the vibrating body 26 will be described later.

Although FIG. 1 illustrates an example in which two vibrating bodies 26 are provided and the vibrating bodies 26 are provided side by side on the same side of the base body 20, the present invention is not limited to this. That is, if it is possible to transmit the pressing feeling to a user who presses the second major surface 20b of the substrate 20 corresponding to the display input region E _I, for the number and position of the vibrating body 26, is arbitrary. For example, the vibrating body 26 may be provided on the base body 20 on two opposing short sides.

  The liquid crystal display panel 3 includes a first transparent substrate 30, a second transparent substrate 31 disposed opposite to the first transparent substrate 30, and a liquid crystal interposed between the first transparent substrate 30 and the second transparent substrate 31. Layer 32. The second transparent substrate 31 has a third main surface 31 a facing the touch panel 2. Here, the driving method of the liquid crystal display panel 3 may be a simple matrix driving method or an active matrix driving method. In addition, as a mode of the liquid crystal display panel 3, any of TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, IPS (In-Plane Switching) type, VA (Vertical Alignment) type, OCB (Optically Compensated Bend) type In other modes, for example, an AFFS (Advanced Fringe Field Switching) type or the like may be used.

  The backlight 4 includes a light source 41, a light guide plate 42, and a reflection plate 43. The light source 41 is a member that plays a role of emitting light toward the light guide plate 42, and includes, for example, an LED (Light Emitting Diode). Instead of the LED, a cold cathode fluorescent lamp (CCFL), a halogen lamp, a xenon lamp, or an EL (Electro-Luminescence) may be used. The light guide plate 42 is a member that plays a role of guiding light from the light source 42 substantially uniformly over the entire lower surface of the liquid crystal display panel 3 (the lower surface of the first transparent substrate 30). The reflecting plate 43 is a member that plays a role of reflecting the light from the light source 41 and guiding the reflected light to the light guide plate 42.

  The housing 5 includes an upper housing 51 and a lower housing 52. As a constituent material of the upper casing 51 and the lower casing 52, for example, a resin such as polycarbonate, or a metal such as stainless steel (SUS) or aluminum can be given. As shown in FIG. 2, the upper housing 51 supports the touch panel 2 via the support member 6. The support member 6 has a sufficient buffering function so that the touch panel 2 can vibrate. Examples of the support member 6 include boron, a urethane material, and an acrylic resin double-sided pressure-sensitive adhesive tape.

  FIG. 7 is a plan view showing a schematic configuration of the liquid crystal display panel 3. In FIG. 7, for convenience of explanation, the vibrating body 26 is indicated by a one-dot chain line. As shown in FIG. 7, the vibrator wiring 7 is provided on the third main surface 31 a of the second transparent substrate 31. The vibrating body wiring 7 is a member that plays a role for applying a voltage to the electrode terminal 261 of the vibrating body 26. One end of the vibrating body wiring 7 is electrically connected to the electrode terminal 261 of the vibrating body 26 and the other end is located in the external conduction region G2. The external conduction region G2 is a region that is electrically connected to an FPC or the like.

  As shown in FIG. 5, the electrode terminal 261 provided on the back surface 26 b of the vibrating body 26 and the vibrating body wiring 7 provided on the third main surface 31 a of the second transparent substrate 31 are anisotropically conductive. Electrical connection is made via rubber 8. The anisotropic conductive rubber 8 is a conductive member having flexibility. The anisotropic conductive rubber 8 is, for example, a member having a configuration in which a plurality of wires are arranged in the thickness direction of the insulating rubber, and a current flows in the direction in which the wires extend. Instead of the anisotropic conductive rubber 8, another conductive member such as a conductive adhesive or solder may be used. However, the use of the anisotropic conductive rubber 8 as in this embodiment is preferable in the following points. That is, since the anisotropic conductive rubber 8 is a flexible conductive member, the vibration of the vibrating body 26 is not caused to be suppressed on the base 20 without excessively suppressing the vibration of the vibrating body 26 by the anisotropic conductive rubber 8. Can communicate.

  Since the electrode terminal 261 of the vibrating body 26 and the vibrating body wiring 7 on the third main surface 31a of the second transparent substrate 31 are electrically connected via the anisotropic conductive rubber 8, the vibrating body A voltage can be applied to the vibrating body 26 via the wiring 7 and the electrode terminal 261 of the vibrating body 26. When a voltage is applied to the vibrating body 26, the vibrating body 26 vibrates.

  The anisotropic conductive rubber 8 may be provided over the entire back surface 26b of the vibrating body 26, or may be provided only in a portion where the electrode terminal 261 of the back surface 26b of the vibrating body 26 is located. If the anisotropic conductive rubber 8 is provided only in the portion where the electrode terminal 261 of the back surface 26b of the vibrating body 26 is located, and the anisotropic conductive rubber 8 is provided over the entire back surface 26b of the vibrating body 26 In comparison, the vibration of the vibrating body 26 can be reduced by the anisotropic conductive rubber 8, which is preferable.

  As described above, in the display device with an input function X1, the vibrating body 26 includes the facing surface 26a that faces the first main surface 20a of the base 20 and the back surface 26b that is located on the opposite side of the facing surface 26a. Yes. An electrode terminal 261 is provided on the back surface 26 b of the vibrating body 26, and the vibrating body wiring 7 is provided on the third main surface 31 a of the second transparent substrate 31. The electrode terminal 261 of the vibrating body 26 and the vibrating body wiring 7 on the third main surface 31 a of the second transparent substrate 31 are electrically connected via the anisotropic conductive rubber 8. That is, the display device X1 with an input function can apply a voltage to the vibrating body 26 through the vibrating body wiring 7 and the electrode terminal 261 of the vibrating body 26.

  Here, suppose that the electrode terminal 261 is provided on the facing surface 26a of the vibrating body 26, contrary to the display device X1 with an input function. In this case, the distance between the electrode terminal 261 and the detection electrodes 21a and 22a and the distance between the electrode terminal 261 and the detection electrode wiring 24 are shorter than those of the display device with an input function X1. For this reason, stray capacitance is generated between the electrode terminal 261 and the detection electrodes 21a and 22a and between the electrode terminal 261 and the detection electrode wiring 24, and the detection sensitivity of the touch panel 2 is reduced by the generated stray capacitance. there is a possibility.

  On the other hand, in the display device X1 with an input function, the electrode terminal 261 is provided on the back surface 26b of the vibrating body 26, and the vibrating body 26 is connected to the vibrating body wiring 7 and the electrode terminal 261 of the vibrating body 26. A voltage is applied. For this reason, in the display device with an input function X1, the distance between the electrode terminal 261 and the detection electrodes 21a and 22a and the distance between the electrode terminal 261 and the detection electrode wiring 24 are increased. Therefore, the stray capacitance generated between the electrode terminal 261 and the detection electrodes 21a and 22a and between the electrode terminal 261 and the detection electrode wiring 24 can be reduced. As a result, the display device with an input function X1 can suppress a decrease in detection sensitivity even when the vibrating body 26 is attached to the base body 20.

In the above description, the example in which the vibrating body 26 is provided on the insulating member 25 has been described, but the present invention is not limited thereto. For example, as shown in FIG. 8, the vibrating body 26 may be provided directly on the first main surface 20 a of the base body 20 corresponding to the outer region _EO instead of on the insulating member 25. However, in such a configuration, since the vibrating body 26 is attached to the base body 20, the outer region _EO becomes large. That is, the display device with an input function X1 is enlarged in the horizontal direction. For this reason, it is preferable that the vibrating body 26 is provided on the insulating member 25 covering the detection electrode wiring 24 from the viewpoint of miniaturization of the display device with an input function X1 as in the present embodiment.

  Next, the operation of the display device with input function X1 according to the above configuration will be described with reference to FIG.

As shown in FIG. 9, when the user presses the second main surface 20b of the base body 20 corresponding to the display input area E _I , the vibrating body 26 detects the pressing load on the base body 20 (Op1). . Here, the load detection function of the vibrating body 26 will be described. That is, when the user presses the second main surface 20b of the base 20 corresponding to the display input area E _I , the base 20 bends. The vibrating body 26 is also bent according to the bending of the base body 20. That is, the bending amount of the vibrating body 26 changes according to the pressing load on the base body 20. In this embodiment, since the vibrating body 26 is a piezoelectric element, it can be converted into a voltage corresponding to the amount of bending. As a result, the pressing load of the base body 20 can be detected by the vibrating body 26. In addition, although the example which implement | achieved the load detection function with the vibrating body 26 was demonstrated above, you may implement | achieve not only this but with load sensors, such as a distortion sensor, for example.

  The tactile transmission driver (not shown) determines whether the pressing load detected in Op1 is equal to or greater than the threshold when the pressing operation on the base 20 by the user is a pressing operation on the input object displayed on the display screen. It is determined whether or not (Op2). Note that the tactile transmission driver is provided on, for example, an FPC electrically connected to the external conduction region G2.

  If the tactile transmission driver determines that the pressing load detected at Op1 is equal to or greater than the threshold (YES at Op2), the tactile transmission driver vibrates the vibrating body 26 (Op3). And the base | substrate 20 vibrates with the vibrating body 26 vibrated by Op3. Thereby, a pressing feeling is transmitted to the user who pressed the base body 20. On the other hand, if the tactile sensation transmission driver determines that the pressing load detected at Op1 is less than the threshold (NO at Op2), the process of FIG. 9 ends.

  The above-described embodiment shows a specific example of the embodiment of the present invention, and various modifications can be made. Hereinafter, some main modifications will be described.

[Modification 1]
FIG. 10 is a cross-sectional view illustrating a schematic configuration of a display device X2 with an input function according to the first modification. 10 is a cross-sectional view showing the same part as FIG. 10, components having the same functions as those in FIG. 5 are given the same reference numerals, and detailed descriptions thereof are omitted.

  In the display device with an input function X2, the insulating member 25 is provided with a plurality of recesses 25a on the surface on which the adhesive member 27 is provided. An adhesive member 27 is embedded in the plurality of recesses 25a. Since the adhesive member 27 is embedded in the plurality of recesses 25a, the area where the insulating member 25 and the adhesive member 27 come into contact increases. Since the area where the insulating member 25 and the adhesive member 27 are in contact with each other increases, the adhesive strength of the vibrating body 26 with respect to the insulating member 25 can be improved. For this reason, in the display device with an input function X2, even if the vibrating body 26 vibrates, the possibility that the vibrating body 26 is peeled off from the insulating member 25 can be reduced.

[Modification 2]
FIG. 11 is a cross-sectional view illustrating a schematic configuration of a display device X3 with an input function according to the second modification. FIG. 11 is a cross-sectional view showing the same part as FIG. 11, components having the same functions as those in FIG. 5 are given the same reference numerals, and detailed descriptions thereof are omitted.

  In the display device with an input function X <b> 3, in the liquid crystal display panel 3, the first transparent substrate 30 has a protruding portion 300 that protrudes outward from the second transparent substrate 31. Further, the protruding portion 300 of the first transparent substrate 30 has a third main surface 30 a facing the touch panel 2. In the display device with an input function X <b> 3, the vibrating body wiring 7 is provided on the third main surface 30 a of the protruding portion 300 of the first transparent substrate 30. The electrode terminal 261 provided on the back surface 26b of the vibrating body 26 and the vibrating body wiring 7 provided on the third main surface 30a of the protruding portion 300 of the first transparent substrate 30 are provided with the anisotropic conductive rubber 8. Is electrically connected. For this reason, the display device X3 with an input function can apply a voltage to the vibrating body 26 via the vibrating body wiring 7 and the electrode terminal 261 of the vibrating body 26 in the same manner as the display device with an input function X1. Further, in the display device with input function X3, the vibrating body wiring 7 is provided on the third main surface 30a of the protruding portion 300 of the first transparent substrate 30, so that it is longer than the display device with input function X1. It can be downsized in the direction.

[Modification 3]
Instead of the liquid crystal display panel 3, a display panel such as a CRT, plasma display, organic EL display, inorganic EL display, LED display, fluorescent display tube, field emission display, surface electric field display, or electronic paper may be used.

X1, X2, X3 Display device 2 with input function Touch panel 20 Base 20a Base first main surface 20b Base second main surface 21a First detection electrode (detection electrode)
22a Second detection electrode (detection electrode)
24 Wiring for detection electrode 25 Insulating member 25a Recessed portion 26 of insulating member Vibrating body 26a Opposing surface 26b of vibrating body Rear surface 261 of vibrating body
30a Third main surface of first transparent substrate (third main surface of display panel)
31a Third main surface of second transparent substrate (third main surface of display panel)
4 Backlight 7 Wiring for vibrator 8 Anisotropic conductive rubber (conductive member)

Claims (7)

A display device with an input function comprising a touch panel and a display panel arranged to face the touch panel,
The touch panel
A base body having a first main surface and a second main surface located on the opposite side of the first main surface;
A detection electrode provided on the first main surface of the substrate;
A vibrating body provided on the first main surface of the base body and vibrating the base body,
The display panel has a third main surface facing the first main surface of the base body,
Vibrator wiring is provided on the third main surface of the display panel,
The vibrator has a facing surface facing the first main surface of the base body and a back surface located on the opposite side of the facing surface.
An electrode terminal is provided on the back surface of the vibrating body,
The display with an input function, wherein the electrode terminal provided on the back surface of the vibrating body and the wiring for the vibrating body provided on the third main surface of the display panel are electrically connected via a conductive member. apparatus. The touch panel
A detection electrode wiring provided on the first main surface of the base body and electrically connected to the detection electrode;
An insulating member provided on the first main surface of the base so as to cover the detection electrode wiring; and
The display device with an input function according to claim 1, wherein the facing surface of the vibrating body and the insulating member are bonded to each other via an adhesive member. The insulating member is provided with a plurality of recesses on the surface on which the adhesive member is provided,
The display device with an input function according to claim 2, wherein the adhesive member is embedded in the plurality of concave portions.   The display device with an input function according to claim 1, wherein the conductive member is anisotropic conductive rubber.   The display device with an input function according to claim 1, further comprising a backlight for irradiating the display panel with light.   The display device with an input function according to claim 1, wherein the touch panel is a capacitive touch panel.   The display device with an input function according to claim 1, wherein the display panel is a liquid crystal display panel.