JP6084875B2 - Display device with input function and electronic device - Google Patents

Description

  The present invention relates to a display device with an input function and an electronic apparatus.

  Conventionally, for example, a display device with an input function in which an input board including a detection electrode for detecting an input operation and a display board including a display electrode for displaying an image are arranged to face each other is known. Yes. A conductive layer is provided on the surface of the input plate that faces the display plate. In such a display device, the input operation is detected based on the capacitance between the finger or the like and the detection electrode in the user, and the pressing operation on the input plate is detected based on the capacitance between the conductive layer and the display electrode. can do. Here, the conductive layer is provided on the entire surface of the input plate facing the display plate, for example, for the purpose of reducing the possibility of electrical noise being mixed from the display electrode to the detection electrode (for example, Patent Document 1).

JP-A-7-64725

  However, in the above conventional display device, for example, since the area of the conductive layer is relatively large, when detecting a pressing operation, there is a possibility that electrical noise mixed into the conductive layer from the display electrode is relatively large. there were. If the electrical noise mixed into the conductive layer from the display electrode is relatively large, the detection accuracy of the pressing operation may be lowered.

  The present invention has been made in view of such circumstances, and an object thereof is related to a display device with an input function and an electronic apparatus that can reduce the possibility of a decrease in detection accuracy.

One aspect of the display device with an input function according to the present invention has a central region and a peripheral region positioned so as to surround the central region, and includes an input plate including a detection electrode for detecting an input operation, A conductive layer provided on the input plate and overlapping the detection electrode in plan view; a display plate disposed opposite to the conductive layer and including a display electrode for displaying an image; and the conductive layer A support member that supports the input plate in the peripheral region so as to separate the layer from the display plate, and the conductive layer includes at least a first conductive layer located in the central region, A part of the first conductive layer located in the peripheral region, and a second conductive layer spaced apart from the first conductive layer, wherein the first conductive layer includes a first portion located in a central region, and a peripheral edge Located in the region and more than the first part The detection electrode has a second portion with a small width in a plan view, and the detection electrode has an input electrode to which a voltage is applied, and a voltage applied to the input electrode that intersects the input electrode in a plan view. And having an output electrode for outputting a signal based on the first direction, when the longitudinal direction of the input electrode in plan view is the first direction, the longitudinal direction of the first conductive layer in plan view is the first direction. And a first control unit having a first voltage supply unit for applying a voltage to the input electrode and a first receiving unit for receiving an output signal from the output electrode. In addition, a plurality of the output electrodes are provided and grouped into a plurality of output electrode groups, and the first receiving unit receives the output signal for each of the plurality of output electrode groups, The first portion of the first conductive layer is a plane And overlaps the one of the output electrodes of the plurality of the output electrodes.

  An electronic apparatus according to the present invention includes the display device with an input function according to the present invention and a housing in which the display device with the input function is accommodated.

  INDUSTRIAL APPLICABILITY The display device with an input function and the electronic device according to the present invention have an effect that the possibility that the detection accuracy is lowered can be reduced.

It is a top view which shows schematic structure of the display apparatus with an input function which concerns on this embodiment. It is a top view which shows an input board and a conductive layer among the display apparatuses with an input function which concern on this embodiment. It is a top view which shows only an input board among the display apparatuses with an input function which concern on this embodiment. It is a top view which shows only a conductive layer among the display apparatuses with an input function which concern on this embodiment. It is the II sectional view taken on the line shown in FIGS. It is a figure which shows the same site | part as FIG. 5 when a finger | toe presses an input board. It is a figure which shows the other Example of the display apparatus with an input function which concerns on this embodiment, and is a figure which shows the same site | part as FIG. It is a figure which shows the other Example of the display apparatus with an input function which concerns on this embodiment, and is a figure which shows the same site | part as FIG. It is a block diagram which shows schematic structure of the display apparatus with an input function which concerns on this embodiment. It is a flowchart explaining operation | movement of the display apparatus with an input function which concerns on this embodiment. It is a flowchart explaining operation | movement of the display apparatus with an input function which concerns on this embodiment. It is a flowchart explaining operation | movement of the display apparatus with an input function which concerns on this embodiment. It is a perspective view which shows schematic structure of the portable terminal which concerns on this embodiment. 10 is a plan view illustrating a schematic configuration of a display device with an input function according to Modification 1. FIG. It is a top view which shows only an input board among the display apparatuses with an input function which concern on the modification 1. FIG. It is a top view which shows only a conductive layer among the display apparatuses with an input function which concern on the modification 1. FIG. It is the II-II sectional view taken on the line shown in FIGS. It is a block diagram which shows schematic structure of the display apparatus with an input function which concerns on the modification 1. FIG. It is a flowchart explaining operation | movement of the display apparatus with an input function which concerns on this embodiment. FIG. 10 is a plan view illustrating a schematic configuration of a display device with an input function according to Modification 2. It is a top view which shows a conductive layer and a metal layer among the display apparatuses with an input function which concern on the modification 2. It is the III-III sectional view taken on the line shown in FIG. 20 and FIG.

  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 electronic apparatus according to the present invention can include arbitrary constituent members not shown in the drawings referred to in this specification.

  First, the external configuration of the display device X1 according to the present embodiment will be described with reference to FIGS.

As shown in FIGS. 1 to 5, the display device X <b> 1 is a display device with an input function. The display device X <b> 1 includes an input plate 2, a conductive layer 3, a display plate 4, a support member 5, a backlight 6, a circuit board 7, and a first housing 8. In FIG. 1, the backlight 6 and the circuit board 7 are not shown.

  The input board 2 has an input function. The input plate 2 has a base 21, a detection electrode 22, a first insulating layer 23, and a second insulating layer 24.

  The base 21 has a role of supporting the detection electrode 22, the first insulating layer 23, and the second insulating layer 24. The base 21 has a first main surface 21A and a second main surface 21B. 21 A of 1st main surfaces are located in a user side rather than the 2nd main surface 21B. The second main surface 21B is located on the opposite side of the first main surface 21A. Specifically, the second main surface 21B is located on the side farther from the user than the first main surface 21A. In the present embodiment, the base body 21 has a rectangular shape in plan view, but is not limited thereto. The base body 21 may be circular or polygonal in plan view. Examples of the constituent material of the input plate 2 include a transparent resin material such as glass or plastic.

  The detection electrode 22 has a role of detecting an input operation. The detection electrode 22 is provided on the second main surface 21 </ b> B of the base 21. Here, when the user of the display device X1 touches or approaches the first main surface 21A with the finger F1, a capacitance is generated between the detection electrode 22 and the finger F1 via the base 21. In the display device X1, an input operation can be detected by capturing the change in the capacity.

  The detection electrode 22 has an input electrode 22a and an output electrode 22b.

  The input electrode 22a is an electrode to which a voltage is applied from the first voltage supply unit 111 (see FIG. 9) included in the control IC 71. A plurality of input electrodes 22 a are provided side by side in the X direction on the second main surface 21 </ b> B of the base 21. In the present embodiment, the input electrode 22a has a substantially rectangular shape extending in the Y direction in plan view. That is, the longitudinal direction of the input electrode 22a is the Y direction. In addition, the planar view shape of the input electrode 22a can be appropriately changed according to the usage mode of the display device X1.

  The output electrode 22b is an electrode that outputs a signal to the first receiving unit 112 (see FIG. 9) included in the control IC 71 based on the voltage applied to the input electrode 22a. A plurality of output electrodes 22 b are provided side by side in the Y direction on the second main surface 21 </ b> B of the base 21. Specifically, the output electrode 22 b is provided on the first insulating layer 23. Here, the first insulating layer 23 covers the input electrode 22 a and is provided on the second main surface 21 </ b> B of the base 21. Examples of the constituent material of the first insulating layer 23 include resin materials such as acrylic resins, silicone resins, rubber resins, and urethane resins.

  In the present embodiment, the output electrode 22b has a substantially rectangular shape extending in the X direction in plan view. That is, the longitudinal direction of the output electrode 22b is the X direction. In addition, the planar view shape of the output electrode 22b can be appropriately changed according to the usage mode of the display device X1. Here, the X direction and the Y direction are different from each other. For this reason, the output electrode 22b intersects the input electrode 22a in plan view. The plurality of output electrodes 22b are grouped into a plurality of output electrode groups 22B. In the present embodiment, the output electrode group 22B includes three output electrodes 22b, and three groups are provided.

Examples of the constituent material of the detection electrode 22 include a light-transmitting conductive member. Examples of the light-transmitting conductive member include ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), AZO (Al-Doped Zinc Oxide), tin oxide, zinc oxide, or a conductive polymer. . As a method for forming the detection electrode 22, for example, the above-described material is formed by sputtering, vapor deposition, or CVD (Chemical Vapor Deposition). And it forms by apply | coating photosensitive resin to the surface of this film | membrane, and patterning a film | membrane to a predetermined shape through an exposure, image development, and an etching process.

  The second insulating layer 24 has a role of reducing the possibility that the output electrode 22b is corroded by moisture absorption in the atmosphere. The second insulating layer 24 has a role of electrically insulating the output electrode 22b and the conductive layer 3 from each other. The second insulating layer 24 covers the output electrode 22b and is provided on the first insulating layer 23.

  In the present embodiment, the input plate 2 is a cover panel integrated capacitive touch panel, but is not limited thereto, and may be a laminated capacitive touch panel, for example. When the input plate 2 is a cover panel integrated capacitive touch panel, it is not necessary to provide a cover panel on the first main surface 21A of the base body 21, and the input plate 2 can be reduced in size in the Z direction.

  In the present embodiment, the input plate 2 is a projection-type capacitive touch panel, but is not limited thereto, and may be a surface-type capacitive touch panel, for example. When the input plate 2 is a surface-type capacitive touch panel, the detection electrode 22 may not be divided into the input electrode 22a and the output electrode 22b.

  In the present embodiment, the first insulating layer 23 covers the entire input electrode 22a and is provided on the second main surface 21B of the base 21. However, the present invention is not limited to this. The first insulating layer 23 may be provided only at a portion where the input electrode 22a and the output electrode 22b intersect in plan view.

  Here, the input board 2 has the center area | region E1 and the peripheral area | region E2. The central region E1 is a region located in the center of the input plate 2 in plan view. The central region E1 can be, for example, a region located in the center when the base 21 is divided into three equal parts in the X direction and the Y direction, respectively. The peripheral area E2 is located so as to surround the central area E1. That is, the peripheral area E2 is located outside the central area E1.

  The conductive layer 3 is provided on the input plate 2. Specifically, the conductive layer 3 is provided on the second insulating layer 24. Further, the conductive layer 3 overlaps the detection electrode 22 in plan view. The conductive layer 3 has a first conductive layer 31 and a second conductive layer 32.

  The first conductive layer 31 has a role of generating a capacitance with the display electrode 45 of the display panel 4. In the present embodiment, the first conductive layer 31 is provided along the Y direction, which is the longitudinal direction of the input electrode 22a. That is, the longitudinal direction of the first conductive layer 31 is the Y direction. The first conductive layer 31 has a first part 31a and a second part 31b. The first portion 31a is located in the central region E1. The 2nd site | part 31b is a site | part for electrically connecting the 1st site | part 31a and the 2nd control part 130 (refer FIG. 9) contained in control IC71. The 2nd site | part 31b is following the 1st site | part 31a, and is located in the peripheral area | region E2.

  The second conductive layer 32 has a role of reducing the possibility that electrical noise generated from the display electrode 45 of the display panel 4 is mixed into the detection electrode 22. The second conductive layer 32 is located in the peripheral region E <b> 2 and is separated from the first conductive layer 31. Specifically, the second conductive layer 32 is located so as to surround the first portion 31a located in the central region E1. In the present embodiment, the second conductive layer 32 is provided over substantially the entire peripheral area E2 where the second portion 31b is not provided.

  Examples of the constituent material and the formation method of the conductive layer 3 include the same materials as those of the detection electrode 22.

  The display board 4 has a role of displaying an image. The display board 4 is disposed to face the input board 2. Specifically, the display panel 4 is disposed to face the second main surface 21 </ b> B of the base body 21. In the present embodiment, the display board 4 has substantially the same shape as the input board 21 in plan view, but is not limited to this, and may be, for example, a substantially circular shape or a substantially polygonal shape. The display panel 4 includes a first substrate 41, a second substrate 42, a liquid crystal layer 43, a sealing member 44, and a display electrode 45.

  The first substrate 41 is disposed to face the second main surface 21B of the input plate 2. The second substrate 42 is located on the side farther from the input plate 2 than the first substrate 41. The second substrate 42 is disposed to face the first substrate 41. Examples of the constituent material of the first substrate 41 and the second substrate 42 include a transparent resin material such as glass or plastic.

  The liquid crystal layer 43 is a display member layer for displaying an image. The liquid crystal layer 43 is interposed between the first substrate 41 and the second substrate 42. Specifically, the liquid crystal layer 43 is sealed in a region between the first substrate 41 and the second substrate 42 by the first substrate 41, the second substrate 42, and the sealing member 44. Here, in this embodiment, the area | region where a liquid-crystal layer is located in planar view among the display boards 4 is called display area A1.

  The display electrode 45 is an electrode for displaying an image. The display electrode 45 includes a first display electrode 45a and a second display electrode 45b. The first display electrode 45 a is provided on the surface of the first substrate 41 that faces the second substrate 42. The second display electrode 45 b is provided on the surface of the second substrate 42 that faces the first substrate 41. The display panel 4 is positioned between the first display electrode 45a and the second display electrode 45b by applying a predetermined voltage to the first display electrode 45a or the second display electrode 45b via a driving IC (not shown). An image can be displayed by exciting the liquid crystal layer 43. As the constituent material and the formation method of the display electrode 45, the same materials as those of the detection electrode 22 can be used.

  In addition to the above-described members, the display plate 4 has a polarizing plate for polarizing light, an alignment plate for aligning the liquid crystal layer 43, and a specific wavelength range among visible light incident on the display plate 4. A color filter or the like for passing through is appropriately provided.

  In this embodiment, the display board 4 is an active matrix type display board. Therefore, the second display electrode 45b is a pixel electrode provided in a plurality of regions partitioned by the source line and the gate line. The first display electrode 45a is a counter electrode facing the second display electrode 45b as the pixel electrode. For example, the first display electrode 45a is provided over the entire area of the display area A1. The display board 4 may be a passive matrix type display board. The display board 4 may be an IPS (In Plane Switching) system.

  The support member 5 has a role of supporting the input plate 2. The support member 5 supports the input plate 2 on the second main surface 21B side of the base body 21. The support member 5 is located in the peripheral area E2. The input plate 2 and the display plate 4 are separated from each other by a support member 5. In the present embodiment, the support member 5 is provided on the display board 4, but is not limited thereto. The support member 5 only needs to have a role of separating the input plate 2 and the display plate 4 from each other. Further, in the present embodiment, the support member 5 is positioned so as to surround the display area A1 in plan view, but is not limited thereto. The support member 5 only needs to support the input plate 2 in the peripheral region E2.

Thus, in the display device X1, the support member 5 supports the input plate 2 in the peripheral area E2. A part of the first conductive layer 31 is located in the central region E1. In addition, the second conductive layer 32 is located in the peripheral region E <b> 2 so as to be separated from the first conductive layer 31. For this reason, possibility that detection accuracy will fall can be reduced.

  Specifically, in the display device X1, a pressing operation is detected by detecting a change in capacitance between the first conductive layer 31 and the first display electrode 45a. That is, for example, when a voltage is applied to the first conductive layer 31, the distance between the first conductive layer 31 and the first display electrode 45a is between the first conductive layer 31 and the first display electrode 45a. A capacity corresponding to D1 is generated. Here, as shown in FIG. 6, when the input plate 2 is pressed from the first main surface 21A to the second main surface 21B by the finger F1, the separation distance D1 changes. For this reason, the capacitance generated between the first conductive layer 31 and the first display electrode 45a changes with the change in the separation distance. The display device X1 detects the pressing operation by capturing the change in the capacity.

  Here, in the conventional display device, the conductive layer is not divided into a first conductive layer and a second conductive layer. Specifically, the conductive layer was provided from the central region to the peripheral region. In such a display device, the conductive layer captures a change in capacitance between the first display electrode and detects a pressing operation, and reduces the possibility of electrical noise from the first display electrode entering the detection electrode. Was. However, since the conductive layer is provided from the central region to the peripheral region, there is a high possibility that electrical noise generated from the first display electrode is mixed when a pressing operation is detected. Further, since the input plate is supported by the support member in the peripheral region, when the input plate is pressed from the first main surface to the second main surface by the finger, the conductive layer and the first display located in the peripheral region are displayed. The change in the separation distance from the electrode becomes relatively small. For this reason, there is a low possibility that the conductive layer located in the peripheral region does not contribute to the change in capacitance between the conductive layer and the first display electrode.

  Therefore, in the display device X1, the conductive layer 3 includes the first conductive layer 31 and the second conductive layer 32. A part of the first conductive layer 31 is located in the central region E1. Here, the central region E1 is a region where the separation distance D1 between the conductive layer 3 and the first display electrode 45a is likely to change due to the pressing of the input plate 2 by the finger F1. In the display device X1, at least a part of the first conductive layer 31 is provided in the central region E1, and the second conductive layer 32 spaced from the first conductive layer 31 is provided in the peripheral region E2. Therefore, the first conductive layer 31 can reduce the area in plan view as compared with the conductive layer in the conventional display device, and the capacitance between the first conductive layer 31 and the first display electrode 45a. The possibility that the change becomes small can be reduced. Therefore, the possibility that the detection accuracy of the pressing operation is reduced can be reduced. Further, in the peripheral region E2, the second conductive layer 32 can reduce the possibility that electrical noise is mixed from the first display electrode 45a to the detection electrode 22. For this reason, possibility that the detection accuracy of input operation will fall can be reduced.

  Note that, as in the present embodiment, the planar view width W1 of the first part 31a is preferably larger than the planar view width W2 of the second part 31b. According to such a configuration, the capacitance generated between the first display electrode 45a in the first region 31a located in the central region E1 where the separation distance D1 is likely to change due to the pressing of the input plate 2 by the finger F1 is further increased. Can be bigger.

  In the present embodiment, the example in which the first conductive layer 31 includes the first part 31a and the second part 31b has been described, but the present invention is not limited thereto. For example, as shown in FIG. 7, the first conductive layer 31 may have substantially the same planar view width in the central region E1 and the peripheral region E2. Moreover, the 1st conductive layer 31 may be provided so that the 2nd conductive layer 32 may be divided into two, for example, as shown in FIG. Thus, the plan view shape of the first conductive layer 31 can be variously modified without departing from the spirit of the present invention.

The second conductive layer 32 is preferably set to a reference potential. When the second conductive layer 32 is set to the reference potential, the possibility that electrical noise is mixed into the detection electrode 22 from the first display electrode 45a by the second conductive layer 32 can be further reduced.

  The backlight 6 has a role of entering light over the entire display panel 4. The backlight 6 is disposed behind the display panel 4. The backlight 6 includes a light source 61 and a light guide plate 62. The light source 61 is a member that plays a role of emitting light toward the light guide plate 62, and is composed of an LED (Light Emitting Diode). Note that the light source 61 does not have to be configured by an LED, and may be configured by, for example, a cold cathode fluorescent lamp, a halogen lamp, a xenon lamp, or an EL (Electro-Luminescence). The light guide plate 62 is a member that plays a role of guiding light from the light source 61 substantially uniformly over the entire lower surface of the display plate 4. In the case where a display panel using self-luminous elements is used instead of the display panel 4, the backlight 6 may not be provided.

  The circuit board 7 is disposed below the backlight 6, and a control IC 71 is provided on the lower surface thereof. For example, the control IC 71 has a role of detecting an input operation and a pressing operation. The detection control IC 71 is electrically connected to the detection electrode 22 and the first conductive layer 31 via a flexible printed wiring board (not shown).

The control IC 71 includes, for example, a CPU (Central Processing Unit) and a memory. As shown in FIG. 9, the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 are included. Is included. In the present embodiment, the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 are physically included in one control IC 71. However, the present invention is not limited to this. On the circuit board 7, a control IC may be individually provided for each of the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140.

  Further, the first control unit 110 may be realized by a plurality of control ICs. For example, some functions of the first control unit 110 may be realized by one control IC, and the remaining functions of the first control unit 110 may be realized by the other control IC. The operation control unit 120, the second control unit 130, and the reference potential setting unit 140 are the same. The same applies to the third control unit 150 described in the first modification.

  The circuit board 7 may be provided with a driving IC for driving the display panel 4 and the backlight 6 in addition to the control IC 71. Further, the control IC 71 may not be provided on the circuit board 7a.

  The first housing 8 has a role of accommodating the input board 2, the conductive layer 3, the display board 4, the support member 5, the backlight 6, and the circuit board 7. The first casing 8 is provided such that a part of the first casing 8 is opened, and the first main surface 21A of the base 21 in the input plate 2 is exposed in the opening. Examples of the constituent material of the first casing 8 include resins such as polycarbonate, and metals such as stainless steel and aluminum.

  As described above, the display device X1 inputs various information by performing an input operation or a pressing operation on the first main surface 21A of the base body 21 while seeing through the display plate 4 through the input plate 2. Can do.

  Next, the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 included in the control IC 71 will be specifically described with reference to FIG.

Here, the functions of the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 described above are performed when an arithmetic device such as a CPU provided in the computer executes a predetermined program. Realized.

  The first control unit 110 includes a first voltage supply unit 111 and a first reception unit 112.

The first voltage supply unit 111 has a role of supplying the input signal Vin to the input electrode 22a. In the present embodiment, the input signal Vin is a voltage V1 having a waveform with a predetermined frequency. The first receiving unit 112 has a role of receiving an output signal Iout corresponding to the input signal Vin from the output electrode 22b. That is, if the input operation by the finger F1 is not performed, as the output signal Iout, current amount I ₁ is detected. Here, when an input operation is performed when the finger F1 is in contact with or close to the first main surface 21A of the base body 21, a capacitance C1 is generated between the finger F1 and the detection electrode 22. For this reason, the current amount I ₁ received by the first receiving unit 112 changes to the current amount I ₂ . In the present embodiment, the first receiver 112 detects the output signal Iout for each output electrode group 22B. That is, the first receiving unit 112 simultaneously receives the output signal Iout from the three output electrodes 22b included in one output electrode group 22B.

  The operation control unit 120 includes a comparison unit 121 and a switching unit 122.

The comparison unit 121 refers to the threshold value Ix recorded in a threshold value recording unit (not shown) and compares the threshold value Ix with the output signal Iout. When the output signal Iout reaches the threshold value Ix, the comparison unit 121 determines that an input operation has been performed and detects the input operation. Threshold Ix, for example, may be a value between the current quantity I ₁ and the current amount I _2. In the present embodiment, the first portion 31a overlaps with only one output electrode group 22B. For this reason, the comparison unit 121 calibrates the output signal Iout in consideration of electrical noise when comparing the output signal Iout received from one output electrode group 22B overlapping the first part 31a with the threshold value Ix. As a result, the possibility that the detection accuracy is lowered can be reduced.

  The switching unit 122 has a role of switching operations between the first control unit 110 and the second control unit 130. When the comparison unit 121 detects an input operation, the switching unit 122 stops the operation of the first control unit 110 and starts the operation of the second control unit 130. In addition, when the comparison unit 121 detects a pressing operation, the switching unit 122 stops the operation of the second control unit 130 and starts the operation of the first control unit 110. That is, in the present embodiment, the first control unit 110 and the second control unit 130 are not operating simultaneously. The first control unit 110 and the second control unit 130 may have a period of simultaneous operation.

  The second control unit 130 includes a second voltage supply unit 131 and a second reception unit 132.

The second voltage supply unit 131 has a role of supplying the input signal Vin to the first conductive layer 31. In the present embodiment, the input signal Vin is a voltage V2 having a waveform with a predetermined frequency. The second receiving unit 132 has a role of receiving an output signal Iout corresponding to the input signal Vin. That is, when the pressing operation is not performed with the finger F1, the current amount I is output as the output signal Iout.
₃ is detected. Here, when the finger F1 presses the base body 21 from the first main surface 21A to the second main surface 21B, the capacitance C2 between the first conductive layer 31 and the display electrode 45 changes. For this reason, the current amount I ₃ received by the second reception unit 132 changes to the current amount I ₄ . Here, the comparison unit 121 refers to the threshold value Iy recorded in the threshold value recording unit (not shown) and compares the threshold value Iy with the output signal Iout. When the output signal Iout reaches the threshold value Iy, the comparison unit 121 determines that a pressing operation has been performed and detects the pressing operation. Thus, in this embodiment, the input operation and the pressing operation can be detected by one comparison unit 121.

The reference potential setting unit 140 has a role of setting the detection electrode 22 or the first conductive layer 31 to the reference potential. The reference potential setting unit 140 sets the first conductive layer 31 to the reference potential when the first control unit 110 is operating. For this reason, when the user of the display device X1 performs an input operation, it is possible to further reduce the possibility that electrical noise is mixed into the detection electrode 22 from the first display electrode 45a. The reference potential setting unit 140 sets the detection electrode 22 to the reference potential when the second control unit 130 is operating. For this reason, when the user of the display device X1 performs a pressing operation, it is possible to reduce the possibility that electrical noise is mixed into the first conductive layer 31 from the user's finger F1.

  In the above description, the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 have been described as being implemented by software. However, the present invention is not limited thereto. The first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 may be realized by hardware. In addition, some functions of the first control unit 110, the operation control unit 120, the second control unit 130, and the reference potential setting unit 140 are realized by software, and the first control unit 110, the operation control unit 120, and the second control. The remaining functions of the unit 130 and the reference potential setting unit 140 may be realized by hardware.

  Next, the operation of the display device X1 will be described with reference to FIGS.

First, an operation when detecting an input operation will be described with reference to FIG. As shown in FIG. 10, first, the first voltage supply unit 111 supplies the input signal Vin to the input electrode 22a (Op1). The first receiving unit 112 constantly receives the output signal Iout corresponding to the input signal Vin from the output electrode 22b (Op2). Here, the finger F1 is the base body 21.
When the first main surface 21A is contacted or approached, the output signal Iout changes. Comparison unit 12
1 refers to the threshold value Ix recorded in the threshold value recording unit, compares the threshold value Ix with the output signal Iout received by the first receiving unit 112 (Op3), and determines whether the output signal Iout is equal to or greater than the threshold value Ix. Is determined (Op4). If it is determined that the output signal Iout is greater than or equal to the threshold value Ix (YES in Op4), the comparison unit 121 determines that the input operation has been performed with the finger F1, and detects the input operation (Op5). On the other hand, if the comparison unit 121 determines that the output signal Iut has not reached the threshold value Ix (NO in Op4), the comparison unit 121 returns to Op3 and continues the comparison between the output signal Iout and the threshold value Ix. Note that in Op1 to Op5 described above, the first conductive layer 31 is set to the reference potential.

  Next, the operation after the input operation is detected will be described with reference to FIG. As shown in FIG. 11A, after the comparison unit 121 detects an input operation (Op5), the comparison unit 121 sends a detection completion signal to the switching unit 122. The switching unit 122 that has received the detection completion signal stops the operation of the first control unit 110 (Op6). Then, the switching unit 122 sends a switching signal to the reference potential setting unit 140. The reference potential setting unit 140 that has received the switching signal sets the detection electrode 22 to the reference potential (Op7) and releases the first conductive layer 31 from the reference potential (OP8). Then, the switching unit 122 starts the operation of the second control unit 130 (Op9). Note that the order of Op6 to Op8 is arbitrary.

Next, an operation for detecting a pressing operation will be described with reference to FIG. As shown in FIG. 12, the second voltage supply unit 131 supplies the input signal Vin to the first conductive layer 31 (Op10). Then, the second receiving unit 132 receives the output signal Iout corresponding to the input signal Vin from the first conductive layer 31 (Op11). Here, when the finger F1 presses the input plate 2 from the first main surface 21A to the second main surface 21B, the output signal Iout changes. The comparison unit 121 refers to the threshold value Iy recorded in the threshold value recording unit, and compares the threshold value Iy with the output signal Iout (
Op12), it is determined whether or not the output signal Iout is greater than or equal to the threshold value Iy (Op13). If it is determined that the output signal Iout has reached the threshold value Iy (YES in Op13), the comparison unit 121 determines that the pressing operation has been performed with the finger F1, and detects the pressing operation (Op14). On the other hand, if the comparison unit 121 determines that the detection signal Vout has not reached the threshold value Vy (Op1
3), the process returns to Op12 and the comparison between the output signal Iout and the threshold value Iy is continued. Note that the processing of FIG. 12 may be terminated when the user's finger F1 is separated from the first main surface 21A of the base body 21.

  Next, the operation after detecting the pressing operation will be described with reference to FIG. As illustrated in FIG. 11B, after the comparison unit 121 detects a pressing operation (Op 14), the comparison unit 121 sends a detection completion signal to the switching unit 122. The switching unit 122 that has received the detection completion signal stops the operation of the second control unit 130 (Op15). Then, the switching unit 122 sends a switching signal to the reference potential setting unit 140. The reference potential setting unit 140 that has received the switching signal sets the first conductive layer 31 to the reference potential (Op16) and releases the detection electrode 22 from the reference potential (OP17). Then, the switching unit 122 starts the operation of the first control unit 110 (Op18). Note that the order of Op15 to Op17 is arbitrary.

  As described above, in the display device X1, it is possible to reduce the possibility that the detection accuracy is lowered.

  Next, the mobile terminal Y1 including the display device X1 will be described with reference to FIG. FIG. 13 is a perspective view of the portable terminal Y1.

  As shown in FIG. 13, the mobile terminal Y1 according to the present embodiment is a smartphone terminal. The mobile terminal Y1 is not limited to a smartphone terminal, and may be, for example, a mobile phone, a tablet terminal, or an electronic device such as a PDA (Personal Digital Assistant).

  The portable terminal Y1 includes a display device X1, an audio input unit 501, an audio output unit 502, a key input unit 503, and a second housing 504.

  The voice input unit 501 has a role of inputting a user's voice and the like, and includes a microphone or the like. The audio output unit 502 has a role of outputting audio from the other party, and is configured by an electromagnetic speaker or a piezoelectric speaker. The key input unit 503 is composed of mechanical keys. The key input unit 503 may be an operation key displayed on the display screen. The second housing 504 has a role of accommodating the display device Y1, the audio input unit 501, the audio output unit 502, and the key input unit 503. As a constituent material of the second housing 504, the same material as that of the first housing 8 may be used. Note that the second housing 504 and the first housing 8 of the display device X1 may be integrated.

  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, a wireless LAN module, various interfaces, and the like according to necessary functions. However, illustration and description of these details are omitted.

  As described above, since the mobile terminal Y1 includes the display device X1, it is possible to reduce the possibility that the detection accuracy is lowered.

  Here, instead of the portable terminal Y1, the display device X1 includes various electronic notebooks, personal computers, copiers, game terminal devices, televisions, digital cameras, programmable displays used in industrial applications, and the like. The electronic device may be provided.

  The above-described embodiment can be variously modified. Hereinafter, some main modifications will be described.

[Modification 1]
FIG. 14 is a plan view illustrating a schematic configuration of a display device X2 with an input function according to the first modification. FIG. 15 is a plan view showing only the input plate 2 of the display device X2 with an input function according to the first modification. FIG. 16 is a plan view showing only the conductive layer 3 in the display device X2 with an input function according to the first modification. FIG. 17 is a cross-sectional view taken along the line II-II shown in FIGS. 14 to 17, components having the same functions as those in FIGS. 1 and 3 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 14, the backlight 6 and the circuit board 7 are not shown.

  As shown in FIGS. 14 to 17, in the display device X <b> 2, the conductive layer 3 further includes a third conductive layer 33.

  The third conductive layer 33 is located in the peripheral area E2. The third conductive layer 33 is separated from the first conductive layer 31 and the second conductive layer 32. In the present embodiment, the third conductive layer 33 is positioned so as to be surrounded by the second conductive layer 32 in the peripheral region E2. That is, the second conductive layer 32 is provided in a region where the first conductive layer 31 and the third conductive layer 33 are not located in the peripheral region E2.

  Here, as shown in FIG. 18, the control IC 71 further includes a third control unit 150. The operation control unit 120 included in the control IC 71 further includes a measurement unit 123.

  The third control unit 150 includes a third voltage supply unit 151 and a third reception unit 152. The third voltage supply unit 151 has a role of supplying the input signal Vin to the third conductive layer 33. In the present embodiment, the input signal Vin is a voltage V2 having a waveform with a predetermined frequency. That is, the same input signal Vin is supplied to the first conductive layer 31 and the third conductive layer 33. The third receiving unit 152 has a role of receiving the output signal Iout corresponding to the input signal Vin.

The measurement unit 123 has a role of measuring the capacitance between the first conductive layer 31 and the first display electrode 45a that is changed by pressing the input plate 2 with the finger F1. Specifically, the output signal Iout received by the second receiving unit 132 is not only the capacitance between the first conductive layer 31 and the first display electrode 45a changed by the pressing of the input plate 2 by the finger F1, but the first Electrical noise mixed into the first conductive layer 31 from the one display electrode 45a contributes. In contrast, since the third conductive layer 33 is located in the peripheral region E2, the separation distance between the third conductive layer 33 and the first display electrode 45a is not easily changed by pressing the input plate 2 with the finger F1. That is, the output signal Iout received by the third receiver 151 is exclusively contributed by electrical noise mixed into the third conductive layer 33 from the first display electrode 45a. Therefore, in the display device X2, the measurement unit 123 subtracts the output signal Iout received by the third reception unit 151 from the output signal Iout received by the second reception unit 132. As a result, the capacitance between the first conductive layer 31 and the first display electrode 45a, which has been changed by pressing the input plate 2 with the finger F1, can be measured more accurately.

As in Modification 1, the area of the third conductive layer 33 in plan view is preferably the same as the area of the first conductive layer 31 in plan view. According to such a configuration, the electrical noise mixed into the third conductive layer 33 from the first display electrode 45a and the electrical noise mixed into the first conductive layer 31 from the first display electrode 45a are substantially the same. can do. For this reason, the capacitance between the first conductive layer 31 and the first display electrode 45a changed by the pressing of the input plate 2 by the finger F1 can be measured more accurately by the measurement unit 123. In the present specification, “the area of the third conductive layer 33 in the plan view is the same as the area of the first conductive layer 31 in the plan view” is a concept including “substantially the same”. For example, when the measuring unit 123 subtracts the output signal Iout received by the third receiving unit 151 from the output signal Iout received by the second receiving unit 132, the area of the third conductive layer 33 in plan view is set to the first conductive level. If there is no process for converting the area of the layer 31 in plan view, the area of the third conductive layer 33 in plan view and the area of the first conductive layer 31 in plan view can be regarded as substantially the same. .

  Next, the operation of the display device X2 will be described with reference to FIG. FIG. 19 is a flowchart illustrating an operation when detecting a pressing operation. The display device X2 has an operation flow of FIG. 19 instead of the operation flow of FIG. 12 included in the display device X1.

As shown in FIG. 19, the second voltage supply unit 131 supplies the input signal Vin to the first conductive layer 31 (Op19). Simultaneously with Op19, the third voltage supply unit 151 supplies the input signal Vin to the third conductive layer 33 (Op20). Next, the second receiving unit 132 receives the output signal Iout corresponding to the input signal Vin from the first conductive layer 31 (Op21). Simultaneously with Op21, the third receiving unit 152 outputs the output signal Iout corresponding to the input signal Vin.
Is received from the third conductive layer 33 (Op22). Then, the measurement unit 123 subtracts the output signal Iout received by the third reception unit 152 from the output signal Iout received from the second reception unit 132 (Op23). Note that the measurement at Op23 is not limited to subtraction, and various calculations for accurately measuring the capacitance between the first conductive layer 31 and the first display electrode 45a, which are changed by pressing the input plate 2 with the finger F1, are performed. Including. Then, the comparison unit 121 refers to the threshold value Iy recorded in the threshold value recording unit, compares the threshold value Iy with the measured value at Op23 (Op24), and determines whether the measured value is equal to or greater than the threshold value Iy. (Op25). If it is determined that the measured value has reached the threshold value Iy (YES in Op25), the comparison unit 121 determines that the pressing operation has been performed with the finger F1, and detects the pressing operation (Op26). On the other hand, when it is determined that the measurement value has not reached the threshold value Vy (NO in Op26), the comparison unit 121 returns to Op24 and continues the comparison between the measurement value and the threshold value Iy. Note that the processing of FIG. 19 may be terminated when the user's finger F1 is separated from the first main surface 21A of the base 21.

[Modification 2]
FIG. 20 is a plan view illustrating a schematic configuration of a display device X3 with an input function according to the second modification. FIG. 21 is a plan view showing the conductive layer 3 and the metal layer 9 in the display device with input function X3 according to the second modification. 22 is a cross-sectional view taken along the line III-III shown in FIGS. 20 and 21. FIG. 20 to 22, components having the same functions as those in FIGS. 1, 4, and 5 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 19, the backlight 6 and the circuit board 7 are not shown.

  As shown in FIGS. 20 to 22, the display device X <b> 3 further includes a metal layer 9.

  The metal layer 9 is electrically connected to the second conductive layer 32 outside the display area A1. In the second modification, the metal layer 9 is provided on the second conductive layer 32. The metal layer 9 is formed of a metal thin film, for example. Examples of the constituent material 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. Can be mentioned. Examples of the method for forming the metal thin film include a sputtering method, a CVD method, and a vapor deposition method.

  Here, the constituent material of the second conductive layer 32 is a conductive member having transparent translucency. For this reason, the second conductive layer 32 has a relatively high sheet resistance value. In the second modification, the metal layer 9 having a lower sheet resistance value than the second conductive layer 32 is electrically connected to the second conductive layer 32. For this reason, the shielding effect of the 2nd conductive layer 32 with respect to an electrical noise can be improved more. Moreover, since the metal layer 9 is located outside the display area A1, the possibility that the metal layer 9 is visually recognized by the user can be reduced. Further, the second conductive layer 32 can be set to the reference potential via the metal layer 9.

  As in Modification 2, the metal layer 9 is preferably located so as to surround a part of the first conductive layer 31 and the second conductive layer 32. According to such a configuration, for example, static electricity generated through a region between the input plate 2 and the first casing 8 is likely to jump into the metal layer 8. For this reason, the possibility that the static electricity is mixed into the first conductive layer 31 can be reduced. Therefore, the possibility that the detection accuracy is lowered can be further reduced.

[Modification 3]
In the present specification, the above embodiment, Modification 1 and Modification 2 are individually and specifically described. However, the present embodiment is not limited thereto, and is individually described in the above embodiment, Modification 1 and Modification 2. An example in which the described items are appropriately combined is also described. That is, the display device with an input function according to the present invention is not limited to the display devices X1 to X3, but appropriately combines the matters individually described in the above-described embodiment, modification 1, and modification 2. A display device with an input function is also included.

  Moreover, although this embodiment demonstrated portable terminal Y1 provided with the display apparatus X1, the electronic device which concerns on this invention is not limited to a crack. The electronic apparatus according to the present invention may include the display device X1 or the display device X2 instead of the display device X1.

X1 to X3 Display device Y1 Mobile terminal (electronic device)
A1 display area E1 central area E2 peripheral area 2 input plate 22 detection electrode 22a input electrode 22b output electrode 22B output electrode group 3 conductive layer 31 first conductive layer 31a first part 31b second part 32 second conductive layer 33 third conductive Layer 4 Display panel 45 Display electrode 5 Support member 9 Metal layer 110 First control unit 111 First voltage supply unit 112 First reception unit 120 Operation control unit 121 Comparison unit 122 Switching unit 123 Measurement unit 130 Second control unit 131 Second Voltage supply unit 132 Second reception unit 140 Reference potential setting unit 150 Third control unit 151 Third voltage supply unit 152 Third reception unit 504 Second housing (housing)

Claims (10)

An input plate having a central region and a peripheral region positioned so as to surround the central region, and including a detection electrode for detecting an input operation;
A conductive layer provided on the input plate and overlapping the detection electrode in plan view;
A display plate disposed opposite to the conductive layer and including a display electrode for displaying an image;
A support member that supports the input plate in the peripheral region so as to separate the conductive layer and the display plate;
The conductive layer is
A first conductive layer at least partially located in the central region;
A second conductive layer at least partially located in the peripheral region and spaced apart from the first conductive layer ;
The first conductive layer has a first part located in a central region, and a second part located in a peripheral region and having a smaller planar view width than the first part,
The detection electrode includes an input electrode to which a voltage is applied, and an output electrode for outputting a signal based on the voltage applied to the input electrode that intersects the input electrode in plan view. And
When the longitudinal direction of the input electrode in plan view is the first direction,
The longitudinal direction of the first conductive layer in plan view is the same as the first direction,
A first control unit having a first voltage supply unit for applying a voltage to the input electrode, and a first reception unit for receiving an output signal from the output electrode;
A plurality of the output electrodes are provided and grouped into a plurality of output electrode groups,
The first receiving unit receives the output signal for each of the plurality of output electrode groups,
The display unit with an input function , wherein the first part of the first conductive layer overlaps with one of the plurality of output electrode groups in plan view . An input plate having a central region and a peripheral region positioned so as to surround the central region, and including a detection electrode for detecting an input operation;
A conductive layer provided on the input plate and overlapping the detection electrode in plan view;
A display plate disposed opposite to the conductive layer and including a display electrode for displaying an image;
A support member that supports the input plate in the peripheral region so as to separate the conductive layer and the display plate;
The conductive layer is
A first conductive layer at least partially located in the central region;
A second conductive layer at least partially located in the peripheral region and spaced apart from the first conductive layer;
The second conductive layer is set to a reference potential, the input function-equipped display device. The display board has a display area,
A metal layer electrically connected to the second conductive layer and positioned outside the display area in plan view;
The first conductive layer and the second conductive layer have translucency,
The metal layer has a lower sheet resistance value than that of the second conductive layer, with an input function display device according to claim 1 or 2. The display device with an input function according to claim 3 , wherein the metal layer is positioned so as to surround a part of the first conductive layer and the second conductive layer in a plan view. An input plate having a central region and a peripheral region positioned so as to surround the central region, and including a detection electrode for detecting an input operation;
A conductive layer provided on the input plate and overlapping the detection electrode in plan view;
A display plate disposed opposite to the conductive layer and including a display electrode for displaying an image;
A support member that supports the input plate in the peripheral region so as to separate the conductive layer and the display plate;
The conductive layer is
A first conductive layer at least partially located in the central region;
A second conductive layer at least partially located in the peripheral region and spaced apart from the first conductive layer;
A display device with an input function , comprising: a third conductive layer located in the peripheral region and spaced apart from the first conductive layer and the second conductive layer. The display device with an input function according to claim 5 , wherein an area of the third conductive layer in a plan view is the same as an area of the first conductive layer in a plan view. A second voltage supply unit for supplying a voltage to the first conductive layer, and a second control unit having a second reception unit for receiving an output signal from the first conductive layer;
A third control unit having a third voltage supply unit for supplying a voltage to the third conductive layer, and a third reception unit for receiving an output signal from the third conductive layer;
A measurement unit for measuring the capacitance between the first conductive layer and the display electrode based on the output signal received by the second reception unit and the output signal received by the third reception unit; The display device with an input function according to claim 5 or 6 further provided. An input plate having a central region and a peripheral region positioned so as to surround the central region, and including a detection electrode for detecting an input operation;
A conductive layer provided on the input plate and overlapping the detection electrode in plan view;
A display plate disposed opposite to the conductive layer and including a display electrode for displaying an image;
A support member that supports the input plate in the peripheral region so as to separate the conductive layer and the display plate;
The conductive layer is
A first conductive layer at least partially located in the central region;
A second conductive layer at least partially located in the peripheral region and spaced apart from the first conductive layer;
A first control unit having a first voltage supply unit for applying a voltage to the detection electrode, and a first reception unit for receiving an output signal from the detection electrode;
A second voltage supply unit configured to supply a voltage to the first conductive layer; and a second control unit including a second reception unit configured to receive an output signal from the first conductive layer. ,
Wherein the first conductive layer, in a case where the first control unit is operated, is set to the reference potential, the input function-equipped display device. The display device with an input function according to claim 8 , wherein the detection electrode is set to a reference potential when the second control unit is operating. A display device with an input function according to any one of claims 1 to 9 ,
An electronic apparatus comprising: a housing that houses the display device with an input function.