JP2012243261A - Display device having input function, and appliance - Google Patents

Abstract

A display device with an input function and a device capable of improving reliability are provided.
A display device with an input function includes a liquid crystal display panel 2, a touch panel disposed opposite to the liquid crystal display panel 2, and a frame 4 in which the liquid crystal display panel 2 is housed. 31, a detection electrode provided on the base 31, and a wiring conductor 35 provided on the base 31 and electrically connected to the detection electrode. The frame 4 is set to a reference potential. And has a conductive portion 43 located between the liquid crystal display panel 2 and the wiring conductor 35 of the touch panel.
[Selection] Figure 6

Description

  The present invention relates to, for example, a display device with an input function that detects a place where a user performs an input operation as an input position, and a device.

  In recent years, display devices with an input function including a touch panel have been widely used for mobile terminals such as mobile phones, smartphones, and game terminals (see, for example, Patent Document 1). Such a display device with an input function includes a display panel, a touch panel arranged to face the display panel, and a frame in which the display panel is accommodated. Here, the touch panel has a base, a detection electrode provided on the base, and a wiring conductor provided on the base and electrically connected to the detection electrode.

JP 2010-218542 A

  Since the touch panel is disposed to face the display panel, it is easily affected by noise from the display panel. When the touch panel is affected by noise from the display panel, there is a possibility that the detection accuracy and the detection sensitivity of the input position are lowered in the touch panel. In particular, since the wiring conductor of the touch panel applies a voltage to the detection electrode, when the wiring conductor is affected by noise from the display panel, the detection accuracy and detection sensitivity of the input position on the touch panel are reduced. It becomes easy. When the detection accuracy and detection sensitivity of the input position are lowered, the reliability of the display device with an input function is lowered.

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

  One aspect of the display device with an input function of the present invention includes a display panel, a touch panel disposed to face the display panel, and a frame in which the display panel is accommodated, and the touch panel includes a base body, A detection electrode provided on the substrate; a wiring conductor provided on the substrate and electrically connected to the detection electrode; and the frame is set to a reference potential. And a conductive portion located between the display panel and the wiring conductor of the touch panel.

  One aspect of the device of the present invention includes the display device with an input function according to the present invention in a housing.

  INDUSTRIAL APPLICABILITY The display device with an input function and the device of the present invention have an effect that reliability can be improved.

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 a top view which shows schematic structure of a touch panel. 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 the figure which expanded the part of A1 shown in FIG. It is a perspective view which shows schematic structure of a portable terminal.

  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 display device with an input function and the mobile terminal according to the present invention can include arbitrary constituent members 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 FIGS. 1 and 2, the display device with an input function X1 includes a liquid crystal display panel 2, a touch panel 3, and a frame 4.

  The liquid crystal display panel 2 is a display panel using a liquid crystal composition for display. Specifically, the liquid crystal display panel 2 includes a first substrate, a second substrate disposed opposite to the first substrate, a liquid crystal layer interposed between the first substrate and the second substrate, and the first substrate and the second substrate. And a display member layer that is interposed therebetween and contributes to display. Examples of the display member layer include a pixel electrode and an alignment film. Further, if the liquid crystal display panel 2 is a transmissive type, the liquid crystal display panel 2 includes a backlight that irradiates one substrate, a liquid crystal layer, and the other substrate. If the liquid crystal display panel 2 is a reflective type, the liquid crystal display panel 2 is interposed between the one substrate and the other substrate. A reflective film is provided. Further, if the liquid crystal display panel 2 is a semi-transmissive type, the liquid crystal display panel 2 includes a backlight and a semi-transmissive film interposed between one substrate and the other substrate.

  The driving method of the liquid crystal display panel 2 may be a simple matrix driving method or an active matrix driving method. In the case of the liquid crystal display panel 2 of the active matrix driving method, the methods include TN (Twisted Nematic) type, IPS (In-Plane Switching) type, AFFS (Advanced Fringe Field Switching) type, VA (Vertical Alignment) type. OCB (Optically Compensated Bend) type. Further, it may be a monochrome liquid crystal display panel 2 or a color liquid crystal display panel 2. Here, in practice, a phase difference plate, a polarizing plate, and the like are provided on the front surface or the back surface of the liquid crystal display panel 2.

  Instead of the liquid crystal display panel 2, a display panel such as a plasma display, an organic EL display, or electronic paper may be used.

  The touch panel 3 is disposed opposite to the liquid crystal display panel 2 via the space S1, and is a member that plays a role of detecting a position operated by a user with a finger or a pen as an input position. In the following, an example in which the touch panel 3 is a capacitive touch panel will be described. It may be a touch panel.

  FIG. 3 is a plan view showing a schematic configuration of the touch panel 3 according to the present embodiment. 4 is a cross-sectional view taken along a cutting line II-II shown in FIG. FIG. 5 is a cross-sectional view taken along the cutting line III-III shown in FIG.

  As shown in FIGS. 3 to 5, the touch panel 3 includes a base 31. The base 31 has an operation surface 31a operated by a user with a finger or a pen, and a back surface 31b located on the opposite side of the operation surface 31a. The base 31 is configured to be able to appropriately transmit light in a direction that intersects the operation surface 31a and the back surface 31b, and has an insulating property. Examples of the constituent material of the base 31 include transparent materials such as transparent glass or transparent plastic, and transparent glass is preferable from the viewpoint of visibility. In addition, in this specification, translucency means having transparency with respect to visible light.

On the back surface 31b of the substrate 31 corresponding to the display input region _{E I,} the first detection electrode 32a, a first connection electrode 33a, a second detection electrode 32b, a second connection electrode 33b, and the insulator 34 Is provided.

First detection electrode 32a is finger U1 of a user close to the display input region E _I, are those having a role to detect the input position in the Y direction, to generate an electrostatic capacitance between the finger U1 It has a function. In other words, the first detection electrodes 32 a are provided on the back surface 31 b of the base 31 with a predetermined interval along the X direction. Here, from the viewpoint of improving detection sensitivity, the first detection electrode 32a according to the present embodiment has a substantially rhombus shape in plan view, but is not limited thereto.

  The first connection electrode 33a is a member that plays a role of electrically connecting the adjacent first detection electrodes 32a. The first connection electrode 33 a is provided on the back surface 31 b of the base 31.

Second detection electrode 32b is finger U1 of a user close to the display input region E _I, are those having a role to detect the input position in the X direction, to generate an electrostatic capacitance between the finger U1 It has a function. In other words, the second detection electrodes 32b are provided on the back surface 31b of the base 31 with a predetermined interval along the Y direction. Here, the second detection electrode 32b according to the present embodiment has a substantially rhombus shape in plan view from the viewpoint of improving detection sensitivity, but is not limited thereto.

  The second connection electrode 33b is a member that plays a role of electrically connecting the adjacent second detection electrodes 32b. The second connection electrode 33 b is provided on the insulator 34 so as to be electrically insulated from the first connection electrode 33 a and straddle the insulator 34. Here, the insulator 34 is provided on the back surface 31b of the base 31 so as to cover the first connection electrode 33a. Examples of the constituent material of the insulator 34 include a transparent resin such as an acrylic resin, an epoxy resin, or a silicone resin.

  Examples of the constituent material of the first detection electrode 32a, the first connection electrode 33a, the second detection electrode 32b, and the second connection electrode 33b 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 Examples thereof include conductive polymers (for example, PEDOT and PSS).

A wiring conductor 35 is provided on the back surface 31b of the base 31 corresponding to the outer region _EO .

The wiring conductor 35 is a member that plays a role for applying a voltage to the first detection electrode 32a and the second detection electrode 32b. One end of the wiring conductor 35 has the first detection electrode 32a and the second detection electrode 32a.
The other end is electrically connected to the detection electrode 32b and is located in the external conduction region G1. For example, the wiring conductor 35 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 method.

  The protection member 36 is a member that plays a role of protecting the first detection electrode 32a, the first connection electrode 33a, the second detection electrode 32b, the second connection electrode 33b, the insulator 34, and the wiring conductor 35. For this reason, the protection member 36 is provided so as to cover these members. That is, the protection member 36 is joined to the back surface 31 b of the base 31 via the joining member 37. Examples of the protective member 36 include a polyethylene terephthalate film, an acrylic film, a polycarbonate film, and a resin film. Moreover, as the joining member 37, an acrylic adhesive, a silicone adhesive, a rubber adhesive, a urethane adhesive, etc. are mentioned, for example.

A coloring member 38 is provided on the operation surface 31a of the base 31 corresponding to the outer region _EO . The coloring member 38 is a member that plays a role of decorating the outer region _EO of the display device with an input function X1. In this embodiment, the colored member 38 is formed in a frame shape so as to surround the display input region E _I. Examples of the coloring member 38 include a resin material such as a polyvinyl chloride resin, a polyamide resin, a polyester resin, an acrylic resin, and a urethane resin, and a pigment or dye having a predetermined color as a colorant. Can be mentioned. Examples of the method for forming the coloring member 38 include a screen printing method.

FIG. 6 is an enlarged view of the portion A1 shown in FIG. As shown in FIG. 6, a light shielding film 39 is provided on the back surface 31b of the base 31 corresponding to the outer region _EO . The light shielding film 39 is a member that plays a role of reducing the possibility that the light of the backlight leaks to the outside. In the present embodiment, the light blocking layer 39 is formed in a frame shape so as to surround the display input region E _I. The light shielding film 39 is embedded in the bonding member 37. Examples of the light shielding film 39 include a resin film containing a black pigment or carbon, a metal chromium film, or a titanium film.

  The frame 4 is a member that plays a role for accommodating the liquid crystal display panel 2. Examples of the constituent material of the frame 4 include a resin such as polycarbonate, or a metal such as stainless steel and aluminum.

As shown in FIG. 2, the frame 4 includes a lower frame 41, an upper frame 42, and a conductive portion 43. The lower frame 41 is a part on which the liquid crystal display panel 2 is placed. The upper frame 42 is a part provided on the lower frame 41 so as to surround the liquid crystal display panel 2. In the present embodiment, the lower frame 41 and the upper frame 42 are configured integrally, but the lower frame 41 and the upper frame 42 may be configured separately and independently. Conducting site 43 is a portion constructed from the upper frame 42 and protrudes inward, as shown in FIG. 3, is formed in a frame shape so as to surround the display input region E _I. FIG. 3 is a plan view showing a schematic configuration of the touch panel 3, and a portion where the conductive portion 43 is located is indicated by a broken line.

  In the present embodiment, the upper frame 42 and the conductive portion 43 are integrally formed, but the present invention is not limited to this. The upper frame 42 and the conductive portion 43 may be configured separately and independently. It is preferable that the upper frame 42 and the conductive portion 43 are integrally formed because the cost for the upper frame 42 and the conductive portion 43 is reduced.

  The conductive portion 43 is set to a reference potential, and is located between the liquid crystal display panel 2 and the wiring conductor 35 of the touch panel 3 as shown in FIG. Here, when the liquid crystal display panel is the liquid crystal display panel 2 using the active matrix driving method, when the liquid crystal display panel 2 is AC driven, it is arranged on the other substrate (not shown) in order to suppress the voltage amplitude of the data wiring. The common electrode voltage is alternately switched between a low voltage and a high voltage. Noise is generated from the liquid crystal display panel 2 with the switching of the voltage of the common electrode.

  For this reason, as in the present embodiment, the conductive portion 43 is set to the reference potential, and if the conductive portion 43 is located between the liquid crystal display panel 2 and the wiring conductor 35 of the touch panel 3, the conductive portion 43 is conductive. In the part 43, noise from the liquid crystal display panel 2 can be shielded. Since noise from the liquid crystal display panel 2 can be shielded at the conductive portion 43, the influence of noise from the liquid crystal display panel 2 on the wiring conductor 35 of the touch panel 3 can be reduced. As a result, in the touch panel 3, it is possible to reduce the possibility that the detection accuracy and detection sensitivity of the input position will decrease.

  In the touch panel 3, the conductive portion 43 is preferably set to the ground potential in order to further reduce the possibility that the detection accuracy and detection sensitivity of the input position will be reduced.

  The conductive portion 43 and the protective member 36 of the touch panel 3 are bonded via the double-sided tape 5. Thereby, the space S <b> 1 between the liquid crystal display panel 2 and the touch panel 3 is sealed by the touch panel 3, the frame 4, and the double-sided tape 5. For this reason, possibility that water or dust will adhere to the liquid crystal display panel 2 from the outside can be reduced. In addition, in order to improve the waterproof property with respect to the liquid crystal display panel 2, it is preferable that the double-sided tape 5 is a waterproof double-sided tape.

  As shown in FIG. 6, the end surface 43 a of the conductive portion 43 is preferably located outside the end portion 39 a inside the light shielding film 39 in a cross-sectional view. In this way, the conductive portion 43 that protrudes inward from the upper frame 42 is hidden by the coloring member 38 and the light shielding film 39. That is, by providing the coloring member 38 and the light shielding film 39, the possibility that the conductive portion 43 is visually recognized by the user can be reduced.

  Next, the detection principle of the touch panel 3 will be described.

The operating surface 31a of the substrate 31 corresponding to the display input region E _I, finger U1 is conductor proximity, contact, or is pressed, the finger U1 and the detection electrode 32a, electrostatic capacitance between the 32b changes. Here, a position detection driver (not shown) always detects a change in capacitance between the finger U1 and the detection electrodes 32a and 32b. 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 touch panel 3 can detect the input position. The touch panel 3 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.

The touch panel 3 can input various types of information by performing an input operation on the display input area E _I while looking through the liquid crystal display panel 2. When inputting various types of information, the touch panel 3 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 31 in the touch panel 3 includes one or a plurality of vibrating bodies (for example, piezoelectric elements), and when a predetermined input operation or a predetermined pressing load is detected, the vibrating body is vibrated at a predetermined frequency. This can be realized.

  As described above, according to the display device with input function X1, the reliability can be improved.

  FIG. 7 is a perspective view showing a schematic configuration of a portable terminal Y1 including the display device with input function X1. The mobile terminal Y1 is, for example, a mobile phone, a smartphone, or a PDA. As shown in FIG. 7, the portable terminal Y <b> 1 includes a display device X <b> 1 with an input function, a housing 101, and operation keys 102. The housing | casing 101 is a member which bears the role which accommodates the display apparatus X1 with an input function. The operation key 102 is a key that is input by the user. The operation key 102 may be an operation key displayed on the display screen or may be an operation key that physically exists.

  In order to detect the input position of the input device X1, the portable terminal Y1 includes the position detection driver described above. As described above, the position detection driver is a driver that detects a position where a change in capacitance is detected as an input position when a change in capacitance of a predetermined value or more is detected. In addition, the mobile terminal Y1 is provided with a control driver that controls the operation of each part of the mobile terminal Y1, such as displaying an object on the display screen of the liquid crystal display panel 2 or controlling transmission / reception of audio data. The control driver performs control such as switching an object displayed on the display screen to another object based on an input detection signal from the position detection driver. The control driver and the position detection driver may be physically the same driver or may be physically different drivers.

  Since the portable terminal Y1 includes the display device with input function X1 in the housing 101, the reliability can be improved.

  Here, the display device X1 with an input function is a programmable display, an electronic notebook, a personal computer, a copying machine, a terminal device for games, a television, a digital camera, etc. used for industrial purposes instead of the portable terminal Y1. It may be provided in various devices.

Display device with X1 input function Y1 Mobile terminal 2 Liquid crystal display panel (display panel)
3 Touch Panel 31 Base 32a First Detection Electrode (Detection Electrode)
32b Second detection electrode (detection electrode)
35 Wiring conductor 39 Light-shielding film 38a End 4 inside the light-shielding film Frame 43 Conductive part 43a Conductive part end face 101 Housing

Claims (6)

A display panel;
A substrate, a detection electrode provided on the substrate, and a wiring conductor provided on the substrate and electrically connected to the detection electrode, and disposed opposite to the display panel; Touch panel,
A conductive portion located between the display panel and the wiring conductor of the touch panel,
The input device, wherein the conductive portion is set to a reference potential. A frame containing the display panel;
The input device according to claim 1, wherein the conductive portion is configured to protrude inward from the frame. The touch panel further includes a light shielding film,
3. The display device with an input function according to claim 1, wherein an end surface of the conductive portion is positioned outside a side end portion of the light shielding film in a cross-sectional view.   The display device with an input function according to claim 1, wherein the reference potential is a ground potential. 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.   The apparatus provided with the display apparatus with an input function as described in any one of Claims 1-5 in the housing | casing.

Images