JP5937307B2 - Display device with input function and device - Google Patents

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, a display device with an input function including a touch panel has been widely used in devices such as a mobile phone, a smartphone, and a game terminal (for example, see Patent Document 1). Such a display device with an input function includes a display panel, a touch panel disposed in front of the display panel, a protective member disposed in front of the touch panel, a backlight disposed in the rear of the display panel, and the display panel. , A touch panel, and a housing in which a backlight is accommodated. Moreover, the protective member is located inside the end of the touch panel.

JP 2010-218542 A

  However, in the conventional display device with an input function, there is a possibility that the light of the backlight leaks outside from the boundary portion between the housing and the protective member via the outer region of the touch panel. When the light from the backlight leaks to the outside, the user may be able to visually recognize the flicker of light at the boundary between the housing and the protective member.

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

One aspect of the display device with an input function of the present invention is a display panel, a touch panel disposed in front of the display panel, a protective member disposed in front of the touch panel, and disposed behind the display panel. A backlight and a housing in which the display panel, the touch panel, and the backlight are housed, and the protection member is located on an inner side than an end of the touch panel, and the housing is The touch panel has a protruding portion that protrudes in a direction in which the protective member is located, and the touch panel is provided with a light shielding film at a portion facing a gap provided between the protruding portion and the protective member. The light shielding film is provided at a predetermined distance or more away from the end 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 device housing.

  The display device with an input function and the device of the present invention have an effect that visibility 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 top view of the display apparatus with an input function showing the relationship between a light shielding film and a boundary part. It is a perspective view which shows schematic structure of the portable terminal which concerns on one Embodiment of this invention.

  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 device according to the present invention may include arbitrary components 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 X <b> 1 includes a liquid crystal display panel 2, a backlight 3, a touch panel 4, a protective film 5, and a housing 6.

  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. 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. Further, it may be a monochrome liquid crystal display panel 2 or a color liquid crystal display panel 2. Here, in reality, a retardation plate, a polarizing plate, and the like are provided on the front surface or the back surface of the liquid crystal display panel 2, but illustration and description of these details are omitted.

  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 backlight 3 is disposed behind the liquid crystal display panel 2 and is a member that plays a role of irradiating the liquid crystal display panel 2. The backlight 3 includes a light source 31 and a light guide plate 32. The light source 31 is a member that plays a role of emitting light toward the light incident surface 32a of the light guide plate 32, 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 32 is a member that plays a role for guiding light from the light source 31 substantially uniformly over the entire lower surface of the liquid crystal display panel 2. Here, in practice, a reflective plate is provided on the back surface of the light guide plate 32, and a diffuser plate, a lens sheet, and the like are provided on the front surface of the light guide plate 32. However, illustration and description of these details are omitted.

The touch panel 4 is disposed in front of the liquid crystal display panel 2 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. Hereinafter, an example in which the touch panel 4 is a capacitive touch panel will be described. However, the touch panel 4 is not limited to this, and a resistive film touch panel, a surface acoustic wave touch panel, an infrared touch panel, or an electromagnetic induction system is used. It may be a touch panel.

  FIG. 3 is a plan view showing a schematic configuration of the touch panel 4 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 4 includes a base body 41. The base 41 has an operation surface 41a operated by a user with a finger or a pen, and a back surface 41b located on the opposite side of the operation surface 41a. The base body 41 is configured to be able to appropriately transmit light in a direction that intersects the operation surface 41a and the back surface 41b, and has an insulating property. Examples of the constituent material of the base body 41 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.

On the back surface 41b of the substrate 41 corresponding to the display input region _{E I,} the first detection electrode 42a, a first connection electrode 43a, and the second detection electrode 42b, a second connection electrode 43 b, and the insulator 44 Is provided.

First detection electrode 42a 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 Y direction, to generate an electrostatic capacitance between the finger F1 It has a function. In other words, the first detection electrodes 42 a are provided on the back surface 41 b of the base body 41 with a predetermined interval along the X direction. Here, from the viewpoint of improving detection sensitivity, the first detection electrode 42a according to the present embodiment has a substantially rhombus shape in plan view, but is not limited thereto.

  The first connection electrode 43a is a member that plays a role of electrically connecting the adjacent first detection electrodes 42a. The first connection electrode 43 a is provided on the back surface 41 b of the base body 41.

Second detection electrode 42b are fingers F1 of the user has approached 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 F1 It has a function. In other words, the second detection electrodes 42 b are provided on the back surface 41 b of the base body 41 with a predetermined interval along the Y direction. Here, from the viewpoint of improving detection sensitivity, the second detection electrode 42b according to the present embodiment has a substantially rhombus shape in plan view, but is not limited thereto.

  The second connection electrode 43b is a member that plays a role of electrically connecting the adjacent second detection electrodes 42b. The second connection electrode 43b is provided on the insulator 44 so as to be electrically insulated from the first connection electrode 43a and straddle the insulator 44. Here, the insulator 44 is provided on the back surface 41b of the base body 41 so as to cover the first connection electrode 43a. Examples of the constituent material of the insulator 44 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 42a, the first connection electrode 43a, the second detection electrode 42b, and the second connection electrode 43b 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 45 is provided on the back surface 41b of the base body 41 corresponding to the outer region _EO .

  The wiring conductor 45 is a member that plays a role for applying a voltage to the first detection electrode 42a and the second detection electrode 42b. One end of the wiring conductor 45 is electrically connected to the first detection electrode 42a and the second detection electrode 42b, and the other end is located in the external conduction region G1. For example, the wiring conductor 45 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.

A protective film 46 is provided on the back surface 41b of the base 41 corresponding to the display input area E _I and the outer area E _O.

  The protective film 46 is a member that plays a role in protecting the first detection electrode 42 a, the first connection electrode 43 a, the second detection electrode 42 b, the second connection electrode 43 b, the insulator 44, and the wiring conductor 45. For this reason, the protective film 46 is provided so as to cover these members. Examples of the constituent material of the protective film 46 include silicon dioxide and acrylic materials. Examples of the method for forming the protective film 46 include a transfer printing method, a spin coating method, and a slit coating method.

  As shown in FIGS. 1 and 2, the protective film 5 is a member that is disposed in front of the touch panel 4 and plays a role for protecting the touch panel 4. Specifically, the protective film 5 protects the operation surface 41 a of the base body 41 in the touch panel 4. For this reason, the protective film 5 is bonded to the operation surface 41 a of the base body 41 through the adhesive material 51. Further, the protective film 5 is located inside the end portion 411 of the base body 41. Examples of the protective film 5 include a polyester film, a polypropylene film, and a polyethylene film. Examples of the adhesive material 51 include an acrylic adhesive material, a silicone adhesive material, a rubber adhesive material, and a urethane adhesive material.

  Moreover, in this embodiment, the decorating member 52 is provided in the outer peripheral part of the protective film 5 (refer FIG. 6). Since the decorative member 52 is provided on the outer peripheral portion of the protective film 5, the outer peripheral portion of the protective film 5 can be decorated. As the decorative member 52, for example, a resin material such as polyvinyl chloride resin, polyamide resin, polyester resin, acrylic resin, urethane resin, or the like containing a pigment or dye of a predetermined color as a colorant Is mentioned. Examples of the method for forming the decorative member 52 include a screen printing method.

  In place of the protective film 5, glass, plastic, or the like formed with a small thickness may be used as the protective member.

The housing 6 is a member that plays a role for housing the liquid crystal display panel 2, the backlight 3, and the touch panel 4. The housing 6 includes a base body 61, a frame body 62, and a protrusion 63. On the substrate 61, the liquid crystal display panel 2, the backlight 3, the touch panel 4, and the protective film 5 are placed. The frame body 62 is provided on the base 61 so as to surround the liquid crystal display panel 2, the backlight 3, the touch panel 4, and the protective film 5. The protruding portion 63 protrudes from the frame body 62 in the direction in which the protective film 5 is located. Examples of the constituent material of the housing 6 include a resin such as polycarbonate, or a metal such as stainless steel and aluminum.

  FIG. 6 is an enlarged view of the portion A1 shown in FIG. As shown in FIG. 6, the touch panel 4 is provided with a light shielding film 47 at a portion facing the boundary portion C <b> 1 between the protruding portion 63 and the protective film 5. Specifically, the light shielding film 47 is provided on the operation surface 41a of the base body 41 of the touch panel 4 at a portion facing the boundary portion C1. In the present embodiment, the boundary portion C <b> 1 is a gap provided between the protruding portion 63 and the protective film 5. The light shielding film 47 is a member that plays a role of reducing the possibility that the light of the backlight 3 leaks to the outside. Examples of the light shielding film 47 include a resin film containing a black pigment or carbon, a metal chromium film, or a titanium film.

Since the light shielding film 47 is provided in the part which opposes the boundary part C1 in the touch panel 4, the light of the backlight 3 may leak outside from the boundary part C1 via the outer side area | region _EO of the touch panel 4. Can be reduced. Since the possibility that the light of the backlight 3 leaks to the outside can be reduced, the possibility that the flickering of the light is visually recognized by the user at the boundary portion C1 can be reduced.

Further, in order to further reduce the possibility that the light of the backlight 3 leaks out from the boundary portion C1, the light shielding film 47 covers the boundary portion C1 in a plan view as shown in FIG. It is preferable to be provided. Therefore, in the present embodiment, the light-shielding film 47 is formed in a frame shape so as to surround the display input region E _I.

  Further, as in the present embodiment, it is preferable that a part of the light shielding film 47 is covered with the adhesive material 51. Since part of the light shielding film 47 is covered with the adhesive material 51, the possibility that the light shielding film 47 is peeled off from the operation surface 41a of the base body 41 can be reduced.

  In order to further reduce the possibility that the light shielding film 47 is peeled off from the operation surface 41 a of the base body 41, it is preferable that the light shielding film 47 covered with the adhesive material 51 is provided with a plurality of holes. By providing a plurality of holes in the light shielding film 47, the operation surface 41a of the base body 41 and the light shielding film 47 are bonded in a state where the adhesive material 51 is embedded in the holes. That is, since the adhesion area of the adhesive material 51 to the light shielding film 47 is increased, the possibility that the light shielding film 47 is peeled off from the operation surface 41a of the base body 41 can be further reduced.

  Further, as in the present embodiment, the light shielding film 47 is preferably provided at a predetermined distance L1 or more away from the end 411 of the base body 41. In the present embodiment, the predetermined distance L1 is 0.85 to 1.15 mm. Since the light shielding film 47 is provided at a predetermined distance L1 or more, the possibility that the light shielding film 47 is peeled off from the operation surface 41a of the base 41 when the end surface 41c of the base 41 is polished can be reduced.

  In the above description, the example in which the light shielding film 47 is provided on the operation surface 41a of the base body 41 has been described. However, the present invention is not limited to this. For example, the light shielding film 47 may be provided on the protective film 46 in the touch panel 4 at a portion facing the boundary portion C1.

Further, in the present embodiment, the light shielding film 47 is provided at a portion facing the boundary portion C <b> 1 and at a portion facing the wiring conductor 45. In this case, it is preferable to set the light shielding film 47 to the reference potential by including the conductive material in the light shielding film 47 or forming the light shielding film 47 with the conductive material. In this way, external noise can be shielded to some extent by the light shielding film 47. Since the noise from the outside can be shielded to some extent by the light shielding film 47, the influence of the noise from the outside on the wiring conductor 45 can be reduced. As a result, in the touch panel 4, the possibility that the detection accuracy and detection sensitivity of the input position are reduced can be reduced.

  In the touch panel 4, it is preferable that the light shielding film 47 is set to the ground potential in order to further reduce the possibility that the detection accuracy and detection sensitivity of the input position are lowered.

  Next, the detection principle of the touch panel 4 will be described.

The operating surface 41a of the substrate 41 corresponding to the display input region E _I, the finger F1 is a conductor through the protective film 5 is close, contacting, or pressed, fingers F1 and the detection electrode 42a, an electrostatic between 42b The capacitance changes. Here, a position detection driver (not shown) always detects a change in electrostatic capacitance between the finger F1 and the detection electrodes 42a and 42b. 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 4 can detect the input position. The touch panel 4 may detect either 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 4 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 4 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 41 of the touch panel 4 includes one or a plurality of vibrating bodies (for example, piezoelectric elements) and vibrates at a predetermined frequency when a predetermined input operation or a predetermined pressing load is detected. This can be realized.

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

  FIG. 8 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. 8, the portable terminal Y <b> 1 includes a display device with an input function X <b> 1, a voice input unit 101, a voice output unit 102, a key input unit 103, and a device casing 104.

  The voice input unit 101 includes, for example, a microphone or the like, and inputs a user's voice or the like. The audio output unit 102 includes a speaker or the like, and outputs audio from the other party. The key input unit 103 is constituted by, for example, a mechanical key. Note that the key input unit 103 may be an operation key displayed on the display screen. The device housing 104 is a member that plays a role of housing the display device with an input function X 1, the sound input unit 101, the sound output unit 102, and the key input unit 103.

  In addition, the portable terminal Y1 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 mobile terminal Y1 includes the display device X1 with an input function, the visibility can be improved.

In addition, although the example which provided the audio | voice input part 101 in the portable terminal Y1 was demonstrated above, it is not limited to this. That is, the voice input unit 101 may not be provided in the portable terminal Y1.

  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 (equipment)
2 Liquid crystal display panel (display panel)
3 Backlight 4 Touch Panel 411 Touch Panel Edge 5 Protective Film (Protective Member)
51 Adhesive Material 6 Case 63 Projection 47 Light-shielding Film 104 Device Case C1 Boundary

Claims (5)

A display panel;
A touch panel disposed in front of the display panel;
A protective member disposed in front of the touch panel;
A backlight disposed behind the display panel;
A housing that houses the display panel, the touch panel, and the backlight;
The protective member is located inside the end of the touch panel,
The housing has a protruding portion protruding in a direction in which the protection member is located,
The touch panel is provided with a light-shielding film at a portion facing a gap provided between the protruding portion and the protective member ,
The display device with an input function , wherein the light shielding film is provided at a predetermined distance or more away from an end of the touch panel .   The display device with an input function according to claim 1, wherein the light shielding film is provided so as to cover the gap in a plan view. The protective member is bonded to the touch panel via an adhesive material,
The display device with an input function according to claim 1, wherein a part of the light shielding film is covered with the adhesive material. The touch panel is a capacitive touch panel,
The display panel is a liquid crystal display panel, an input function-equipped display device according to any one of claims 1-3. The apparatus provided with the display apparatus with an input function as described in any one of Claims 1-4 in the housing | casing for apparatuses.

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