JP2015011582A - Input device, display device and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with an input function and electronic equipment capable of reducing possibility that detecting accuracy is deteriorated.SOLUTION: An input device X1 includes: a plurality of first detection electrode patterns 4 electrically connected to each other; second detection electrode patterns 6 each disposed between the first detection electrode patterns 4; third detection electrode patterns 9 crossing the plurality of first detection electrode patterns 4 and the second detection electrode patterns 6 in a plan view; and a control part 11 having a voltage supply part 111 for applying a voltage to the third detection electrode patterns 9, a first reception part 112 for receiving a signal from the first detection patterns 4, a second reception part 113 for receiving a signal from the second detection electrode patterns 6, a first correction part 114 for correcting the signal received by the first reception part 112 on the basis of the signal received from the second reception part 113 and a first determination part 115 for determining that an input operation has been performed when the signal corrected by the first correction part 114 reaches a predetermined value.

Description

  The present invention relates to an input device, a display device, and a mobile terminal.

  2. Description of the Related Art Conventionally, an input device that detects an input operation according to a capacitance formed between a user's finger and a detection electrode pattern is known. In such an input device, a plurality of first detection electrode patterns and a plurality of second detection electrode patterns are provided on a base. The plurality of second detection electrode patterns intersect with the plurality of first detection electrode patterns in plan view. In addition, adjacent first detection electrode patterns among the plurality of first detection electrode patterns are electrically connected to each other (for example, see Patent Document 1). In such an input device, for example, a voltage is applied to the second detection electrode pattern, and the control unit receives a signal from the first detection electrode pattern. Here, when the finger of the user is close to the base body, a capacitance is formed between the first detection electrode pattern and the finger, so that a signal received by the control unit changes. In the conventional input device, an input operation can be detected by capturing the change in the signal.

JP 2010-39515 A

  By the way, for example, when the conventional input device is incorporated in a portable terminal, an external electronic device may be connected to the portable terminal. When an external electronic device is connected to the portable terminal, the ground potential in the input device may fluctuate with respect to the earth potential. When the ground potential in the input device fluctuates, current may flow through the first detection electrode pattern due to the capacitance formed between the finger of the user and the first detection electrode pattern. . For this reason, the current becomes noise, and the detection accuracy of the input operation in the input device may be reduced.

  The present invention has been made in view of such circumstances, and an object thereof is related to an input device, a display device, and a mobile terminal that can reduce the possibility that the detection accuracy is lowered.

  One aspect of the input device according to the present invention is provided between a plurality of first detection electrode patterns adjacent to each other and electrically connected to each other, and the first detection electrode patterns adjacent to each other, In addition, the second detection electrode pattern separated from the first detection electrode pattern and the plurality of first detection electrode patterns and the second detection electrode pattern are separated from each other, and the plurality of first detection electrodes in plan view. A third detection electrode pattern crossing the electrode pattern and the second detection electrode pattern; a voltage supply unit for applying a voltage to the third detection electrode pattern; and a voltage applied from the voltage supply unit to the third detection electrode pattern A first receiving unit that receives a signal from the first detection electrode pattern based on the first detection electrode pattern, and a first receiving unit that receives a signal from the voltage supply unit to the third detection electrode pattern. A second receiving unit that receives a signal from the detection electrode pattern, a first correcting unit that corrects a signal received by the first receiving unit based on a signal received from the second receiving unit, and the first correcting unit corrects the signal And a control unit having a first determination unit that determines that an input operation has been performed when the received signal reaches a predetermined value.

  One aspect of the display device according to the present invention includes the input device according to the present invention and a display panel disposed to face the input device.

  One aspect of a portable terminal according to the present invention includes the display device according to the present invention, a housing that accommodates the display panel, and an external connection terminal that is electrically connected to an external electronic device.

  The input device, the display device, and the mobile terminal of 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 input device which concerns on this embodiment. It is the II sectional view taken on the line shown in FIG. It is the figure which expanded the area | region A1 enclosed with the dashed-dotted line shown in FIG. It is a block diagram which shows schematic structure of the input device which concerns on this embodiment. (A) It is the II-II sectional view taken on the line shown in FIG. 3, and is the schematic which showed formation of an electrostatic capacitance. (B) It is the II-II sectional view taken on the line shown in FIG. 3, and is the schematic which showed formation of the electrostatic capacitance when a finger | toe adjoins with respect to an input device. It is a flowchart explaining operation | movement of the input device which concerns on this embodiment. It is sectional drawing which shows the outline of the display apparatus which concerns on this embodiment. It is a perspective view which shows schematic structure of the portable terminal which concerns on this embodiment. 10 is a plan view illustrating a schematic configuration of an input device according to Modification 1. FIG. FIG. 9 is a block diagram illustrating a schematic configuration of an input device according to a first modification. 10 is a flowchart for explaining the operation of an input device according to Modification 2. FIG. 10 is a block diagram illustrating a schematic configuration of an input device according to Modification 3. 10 is a flowchart for explaining the operation of an input device according to Modification 3.

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

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

  First, the external configuration of the input device X1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a plan view showing a schematic configuration of the input device X1. FIG. 2 is a cross-sectional view taken along the line II shown in FIG. FIG. 3 is an enlarged view of a region A1 surrounded by a one-dot chain line shown in FIG.

  As shown in FIG. 1, the input device X1 according to the present embodiment is a capacitive touch panel, and has an input area E1 and an outer area E2. The input area E1 is an area where the user can perform an input operation. The outer area E2 is an area where the user cannot perform an input operation. In this embodiment, the outer side area | region E2 points out the whole area | region where the decorating part 3b is located planarly. In the present embodiment, the outer area E2 is located outside the input area E1 so as to surround the input area E1, but is not limited thereto, and may be located within the input area E1.

  As shown in FIGS. 1 to 3, the input device X <b> 1 includes a base body 2, a decoration layer 3, a first detection electrode pattern 4, a first wiring conductor 5, a second detection electrode pattern 6, a second wiring conductor 7, insulation. A layer 8, a third detection electrode pattern 9, a third wiring conductor 10, and a control IC 11 are provided. In FIG. 1 and FIG. 3, illustration of the decorative layer 3 and the insulating layer 8 is omitted for convenience of explanation. In FIGS. 1 and 3, the first wiring conductor 5, the second wiring conductor 7, and the third wiring conductor 10 are indicated by solid lines from the viewpoint of easy viewing of the drawings.

  The substrate 2 includes a decorative layer 3, a first detection electrode pattern 4, a first wiring conductor 5, a second detection electrode pattern 6, a second wiring conductor 7, an insulating layer 8, a third detection electrode pattern 9, and a third wiring. It has a role of supporting the conductor 10. The base 2 has a first main surface 2A and a second main surface 2B. The first main surface 2A is located closer to the user than the second main surface 2B. The second main surface 2B is located on the opposite side of the first main surface 2A. Specifically, the second main surface 2B is located on the side farther from the user than the first main surface 2A. In the present embodiment, the base body 2 is rectangular in plan view, but is not limited thereto. The substrate 2 may be circular or polygonal in plan view. In this embodiment, the constituent material of the base 2 is glass, but a transparent resin material such as plastic may be employed instead of glass.

  The decoration layer 3 has a role of decorating the first main surface 2A of the base 2. The decorative layer 3 is provided over substantially the entire first main surface 2A of the base 2. The decoration layer 3 has a film part 3a having translucency and a decoration part 3b colored with an arbitrary color. The decoration part 3b is provided only on the 1st main surface 2A of the base | substrate 2 corresponding to the outer side area | region E2. Moreover, the decoration part 3b is located between 2A of 1st main surfaces of the base | substrate 2, and the film part 3a. Examples of the constituent material of the film part 3a include plastics. As a constituent material of the decoration part 3b, the thing containing carbon, titanium, chromium, etc. which are coloring materials with respect to the resin material is mentioned, for example. The decorative layer 3 is bonded onto the first main surface 2A of the base 2 by, for example, an acrylic adhesive, a silicone adhesive, a rubber adhesive, or a urethane adhesive.

  The first detection electrode pattern 4 is an electrode that outputs a signal to the first reception unit 112 (see FIG. 5) included in the control IC 11 based on the voltage applied to the third detection electrode pattern 9. A plurality of first detection electrode patterns 4 are provided side by side in the longitudinal direction of the base 2 (Y direction in FIG. 1) on the second main surface 2B of the base 2 corresponding to the input region E1. In the present embodiment, the first detection electrode pattern 4 has a substantially rectangular shape extending in the short direction (X direction in FIG. 1) of the base 2 in plan view, but is not limited thereto. The shape of the first detection electrode pattern 4 in plan view can be appropriately changed according to the usage mode of the input device X1.

  Examples of the constituent material of the first detection electrode pattern 4 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. . In addition, the 1st detection electrode pattern 4 may be formed with the metal fine wire, for example. As a method for forming the first detection electrode pattern 4, 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 first wiring conductor 5 has a role of electrically connecting the first detection electrode pattern 4 and a control IC 11 (not shown). A plurality of first wiring conductors 5 are provided on the second main surface 2B of the base 2 corresponding to the outer region E2. One end of the first wiring conductor 5 is electrically connected to the end portion of the first detection electrode pattern 4 located on the left side in FIG. In the present embodiment, one end of the first wiring conductor 5 is connected to the end of the first detection electrode pattern 4 in the input region E1, but not limited to this, the first detection electrode pattern in the outer region E2. 4 may be connected to the end portion. If one end of the first wiring conductor 5 is located in the outer region E2, the possibility that the one end of the first wiring conductor 5 is visually recognized can be reduced by the decorative portion 3b. The other end of the first wiring conductor 5 is located in a conduction region E3 included in the outer region E2. For this reason, the first wiring conductor 5 is electrically connected to the control IC 11 via a wiring board (not shown) in the conduction region E3.

  Here, as shown in FIG. 3, one end of the first wiring conductor 5 is branched into two. One end of the first wiring conductor 5 branched into two is connected to the first detection electrode patterns 4 adjacent to each other. For this reason, two first detection electrode patterns 4 adjacent to each other are electrically connected to each other by one first wiring conductor 5. In the input device X1, two adjacent first detection electrode patterns 4 that are electrically connected to each other are referred to as a first detection electrode pattern group 4A. In the present embodiment, 18 first detection electrode patterns 4 are provided. For this reason, there are nine first detection electrode pattern groups 4A. Note that the number of the first detection electrode patterns 4 is arbitrary, and can be appropriately changed according to the usage mode of the input device X1. Further, the number of first detection electrode patterns 4 included in the first detection electrode pattern group 4A is not limited to two, and may be two or more.

  The first wiring conductor 5 is formed of, for example, a metal thin film so as to be hard and have high shape stability. 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.

  The second detection electrode pattern 6 is an electrode that outputs a signal to the second reception unit 113 (see FIG. 5) included in the control IC 11 based on the voltage applied to the third detection electrode pattern 9. A plurality of second detection electrode patterns 6 are provided side by side in the Y direction on the second main surface 2B of the base 2. In the present embodiment, the second detection electrode pattern 6 has a substantially rectangular shape extending in the X direction in plan view, and the length of the second detection electrode pattern 6 and the length of the first detection electrode pattern 4 in the X direction are substantially the same. Are the same. Note that the shape of the second detection electrode pattern 6 in plan view can be changed as appropriate according to the usage mode of the input device X1.

  Eight second detection electrode patterns 6 are provided corresponding to the first detection electrode pattern group 4A. Specifically, the second detection electrode pattern 6 is provided between two adjacent first detection electrode patterns 4 included in the first detection electrode pattern group 4A. Further, the second detection electrode pattern 6 is separated from the first detection electrode pattern 4. That is, the second detection electrode pattern 6 is electrically independent from the first detection electrode pattern 4.

  Examples of the constituent material and the forming method of the second detection electrode pattern 6 include the same materials as those of the first detection electrode pattern 4.

  The second wiring conductor 7 has a role of electrically connecting the first detection electrode pattern 4 and a control IC 11 (not shown). A plurality of second wiring conductors 7 are provided on the second main surface 2B of the base 2 corresponding to the outer region E2. The plurality of second wiring conductors 7 are separated from each other. That is, the plurality of second wiring conductors 7 are electrically independent from each other. One end of the second wiring conductor 7 is electrically connected to the end of the second detection electrode pattern 6 located on the right side of the drawing in FIG. In the present embodiment, one end of the second wiring conductor 7 is connected to the end of the second detection electrode pattern 6 in the input region E1, but not limited to this, the second detection electrode pattern in the outer region E2. 6 may be connected to the end. If one end of the second wiring conductor 7 is located in the outer region E2, the possibility that the one end of the second wiring conductor 7 is visually recognized can be reduced by the decorative portion 3b. The other end of the second wiring conductor 7 is located in the conduction region E3. For this reason, the second wiring conductor 7 is electrically connected to the control IC 11 via a wiring board (not shown) in the conduction region E3.

  Examples of the constituent material and the forming method of the second wiring conductor 7 include the same materials as those of the first wiring conductor 5.

  The insulating layer 8 serves to protect the first detection electrode pattern 4, the first wiring conductor 5, the second detection electrode pattern 6, and the second wiring conductor 7. Here, examples of the role of protecting these members include a role of protecting from corrosion due to moisture absorption, a role of protecting from unnecessary electrical connection, and the like. The insulating layer 8 is provided over substantially the entire second main surface 2B of the base 2. The insulating layer 8 covers at least a part of the first detection electrode pattern 4, the first wiring conductor 5, the second detection electrode pattern 6, and the second wiring conductor 7. The insulating layer 8 is notched in the conduction region E3. For this reason, the other end of the first wiring conductor 5 and the other end of the second wiring conductor 7 are exposed from the insulating layer 8 in the conduction region E3. The insulating layer 8 may not be provided over substantially the entire second main surface 2B of the base body 2, and is provided only on the second main surface 2B of the base body 2 corresponding to the input region E1, for example. May be.

  Examples of the constituent material of the insulating layer 8 include an acrylic resin, a silicone resin, a rubber resin, a urethane resin, or an inorganic compound containing silicon. Examples of the method for forming the insulating layer 8 include a transfer printing method, a spin coating method, and a slit coating method.

  The third detection electrode pattern 9 is an electrode to which a voltage is applied from a voltage supply unit 111 (see FIG. 5) included in the control IC 11. A plurality of third detection electrode patterns 9 are provided side by side in the X direction on the second main surface 2B of the base 2 corresponding to the input region E1. Specifically, the third detection electrode pattern 9 is provided on the insulating layer 8 corresponding to the input region E1. In the present embodiment, the third detection electrode pattern 9 has a substantially rectangular shape extending in the Y direction, but is not limited thereto. The shape of the third detection electrode pattern 9 in plan view can be appropriately changed according to the usage mode of the input device X1.

  The third detection electrode pattern 9 intersects the plurality of first detection electrode patterns 4 and second detection electrode patterns 6 in plan view. Here, as described above, the third detection electrode pattern 9 is provided on the insulating layer 8. For this reason, the third detection electrode pattern 9 is electrically independent from the first detection electrode pattern 4 and the second detection electrode pattern 6. When the insulating layer 8 is not provided, the third detection electrode pattern 9 may be provided directly on the second main surface 2B of the base 2. In such a case, a plurality of insulators are provided corresponding to a plurality of regions where the third detection electrode pattern 9, the first detection electrode pattern 4, and the second detection electrode pattern 6 intersect in plan view. That is, the third detection electrode pattern 9 is provided across the insulator in a region intersecting the first detection electrode pattern 4 or the second detection electrode pattern 6 in plan view.

  Examples of the constituent material and the formation method of the third detection electrode pattern 9 include the same materials as those of the first detection electrode pattern 4.

  The third wiring conductor 10 has a role of electrically connecting the third detection electrode pattern 9 and a control IC 11 (not shown). A plurality of third wiring conductors 10 are provided on the second main surface 2B of the base 2 corresponding to the outer region E2. Specifically, the third wiring conductor 10 is provided on the insulating layer 8 corresponding to the outer region E2. One end of the third wiring conductor 10 is electrically connected to the end of the third detection electrode pattern 9 located on the lower side in the drawing in FIG. In the present embodiment, one end of the third wiring conductor 10 is connected to the end of the third detection electrode pattern 9 in the input region E1, but not limited to this, the third detection electrode pattern in the outer region E2. 9 may be connected to the end. If one end of the third wiring conductor 10 is positioned in the outer region E2, the possibility of one end of the third wiring conductor 10 being visually recognized can be reduced by the decorative portion 3b. The other end of the third wiring conductor 10 is located in the conduction region E3. Therefore, the third wiring conductor 10 is electrically connected to the control IC 11 via a wiring board (not shown) in the conduction region E3.

  As a constituent material and a forming method of the third wiring conductor 10, the same materials as those of the first wiring conductor 5 can be cited. In the present embodiment, the input device X1 is a cover glass integrated capacitive touch panel, but is not limited thereto. The input device X1 may be a stacked or on-cell capacitive touch panel. When the input device X1 is a laminated type, the second main surface 2B of the base body 2 is positioned closer to the user than the first main surface 2A. In the case where the input device X1 is an on-cell type, the base 2 is such that the second main surface 2B of the base 2 is located closer to the user than the first main surface 2A, and the display panel 12 It is formed integrally with the first substrate 12a (see FIG. 7).

  The control IC 11 has a role of controlling the operation of the input device X1. The control IC 11 is electrically connected to the first detection electrode pattern group 4A via the first wiring conductor 5 located in the conduction region E3. The control IC 11 is electrically connected to the second detection electrode pattern 6 via the second wiring conductor 7 located in the conduction region E3. The control IC 11 is electrically connected to the third detection electrode pattern 9 via the third wiring conductor 10 located in the conduction region E3. The control IC 11 can be provided on the circuit board 14 when the input device X1 is incorporated in the display device Y1 (see FIG. 7), for example.

  Here, the function of the control IC 11 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 is a block diagram illustrating a schematic configuration of the input device X1. In FIG. 4, a block surrounded by a one-dot chain line is a functional block included in the control IC 11. FIG. 5A is a cross-sectional view taken along the line II-II shown in FIG. 3, and is a schematic diagram showing the formation of capacitance. FIG. 5B is a cross-sectional view taken along the line II-II shown in FIG. 3, and is a schematic diagram showing the formation of capacitance when a finger approaches the input device X1.

  As illustrated in FIG. 4, the control IC 11 includes a voltage supply unit 111, a first reception unit 112, a second reception unit 113, a first correction unit 114, and a first determination unit 115. Note that the functions of each unit of the control IC 11 may be realized by software executed on any suitable processor such as a CPU (Central Processing Unit), or may be realized by a dedicated processor such as a digital signal processor. May be. The functions in each unit of the control IC 11 may be realized individually by a plurality of ICs or may be realized by a single IC.

  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.

  The voltage supply unit 111 has a role of supplying the input signal Vin to the third detection electrode pattern 9. In the present embodiment, the input signal Vin is a voltage V1 having a waveform with a predetermined frequency.

  The first receiver 112 has a role of receiving an output signal I1 corresponding to the input signal Vin from the first detection electrode pattern group 4A.

  Specifically, as shown in FIG. 5A, a capacitance C1 and a capacitance C2 are formed in one first detection electrode pattern 4 included in the first detection electrode pattern group 4A. The capacitor C1 is a capacitor formed in a portion where the first detection electrode pattern 4 and the third detection electrode pattern 9 overlap in plan view. The capacitor C2 is a capacitor formed between one first detection electrode pattern 4 and the third detection electrode pattern 9 located on the side of the one first detection electrode pattern 4 by the fringe effect. Further, a capacitor C3 and a capacitor C4 are formed in the other first detection electrode pattern 4 included in the first detection electrode pattern group 4A. The capacitor C3 is a capacitor formed in a portion where the other first detection electrode pattern 4 and the third detection electrode pattern 9 overlap in plan view. The capacitor C4 is a capacitor formed between the other first detection electrode pattern 4 and the third detection electrode pattern 9 located on the side of the other first detection electrode pattern 4 by the fringe effect. Here, when the input signal Vin is supplied to the third detection electrode pattern 9, a current flows through the first detection electrode pattern group 4A according to the capacitors C1 to C4. The first receiving unit 112 receives the current as the output signal I1.

  Here, as shown in FIG. 5B, when the user's finger F1 comes close to the first main surface 2A of the base 2, there is a capacitance between the finger F1 and the first detection electrode pattern group 4A. It is formed. Specifically, a capacitor C5 is formed between one first detection electrode pattern 4 included in the first detection electrode pattern group 4A and the finger F1. A capacitor C6 is formed between the other first detection electrode pattern 4 included in the first detection electrode pattern group 4A and the finger F1. Here, the capacitance C2 formed between the first detection electrode pattern 4 and the third detection electrode pattern 9 is between the finger F1 and the third detection electrode pattern 9 due to the proximity of the finger F1. The capacitance changes to the formed capacitance C2 ′. Similarly, the capacitance C4 formed between the other first detection electrode pattern 4 and the third detection electrode pattern 9 is between the finger F1 and the third detection electrode pattern 9 due to the proximity of the finger F1. The capacitance changes to the formed capacitance C4 ′. Therefore, the output signal I when the finger F1 is close to the first main surface 2A of the base 2 is smaller than the output signal I1 when the finger F1 is not close to the first main surface 2A of the base 2. Become. In the input device X1, the input operation is detected by detecting the change in the output signal I1.

  The second reception unit 113 has a role of receiving the output signal I2 corresponding to the input signal Vin from the second detection electrode pattern 6.

  Specifically, as shown in FIG. 5A, a capacitor C <b> 7 is formed in the second detection electrode pattern 6. The capacitor C7 is a capacitor formed in a portion where the second detection electrode pattern 6 and the third detection electrode pattern 9 overlap in plan view. Here, when the input signal Vin is supplied to the third detection electrode pattern 9, a current flows through the second detection electrode pattern 6 according to the capacitance C7. The second receiving unit 113 receives the current as the output signal I2. The second detection electrode pattern 6 is sandwiched between one first detection electrode pattern 4 and the other first detection electrode pattern 4 included in the first detection electrode pattern group 4A. For this reason, in the 2nd detection electrode pattern 6, the fringe effect between the 3rd detection electrode patterns 9 is suppressed. In other words, the capacitance formed by the fringe effect between the second detection electrode pattern 6 and the third detection electrode pattern 9 is small enough to be ignored as compared with the capacitance C2 and the capacitance C4.

  Also, as shown in FIG. 5B, when the user's finger F1 is close to the first main surface 2A of the base 2, there is a capacitance C8 between the finger F1 and the second detection electrode pattern 6. Is formed. A capacitor C6 is formed between the other first detection electrode pattern 4 included in the first detection electrode pattern group 4A and the finger F1.

  The first correction unit 114 has a role of correcting the output signal I1 received by the first reception unit 112 in accordance with the output signal I2 received by the second reception unit 113. In the input device X1, by correcting the output signal I1 by the first correction unit 114, it is possible to reduce the possibility that the detection accuracy is lowered.

  Specifically, for example, when the input device X1 is incorporated in the mobile terminal Z1 (see FIG. 8), an external electronic device may be connected to the mobile terminal Z1 via the external connection terminal 205. is there. When an external electronic device is connected to the mobile terminal Z1, there is a possibility that the ground potential in the input device X1 varies due to the connection between the ground potential in the electronic device and the ground potential in the input device X1. is there. Specifically, the ground potential in the input device X1 varies with, for example, an amplitude of 0.5 V and a frequency of about 400 kHz, although it varies depending on the type of external electronic device connected to the mobile terminal Z1. When the fluctuation occurs, a potential difference is generated between the ground potential in the input device X1 and the ground potential in the finger F1. Therefore, as shown in FIG. 5B, when the finger F1 comes close to the first main surface 2A of the base 2, the noise signal IX is transmitted to the first detection electrode pattern group 4A via the capacitors C5 and C6. Current flows. That is, the output signal I1 received by the first receiving unit 112 is changed by the noise signal IX in addition to the capacitors C2 and C4. For this reason, the detection accuracy of the input device X1 may be reduced.

  Therefore, in the input device X1, the second detection electrode pattern 6 is provided between one first detection electrode pattern 4 and the other first detection electrode pattern 4 included in the first detection electrode pattern group 4A. As shown in FIG. 5B, when the finger F1 comes close to the first main surface 2A of the base 2, a current as a noise signal IX flows through the second detection electrode pattern 6 through the capacitor C8. Here, as described above, the capacitance formed by the fringe effect between the second detection electrode pattern 6 and the third detection electrode pattern 9 is small enough to be ignored as compared with the capacitance C2 and the capacitance C4. That is, the output signal I2 received by the second receiving unit 113 can be regarded as changing only by the noise signal IX. For this reason, in the 1st correction | amendment part 114, the influence of the noise signal IX in the output signal I1 can be substantially canceled by correct | amending the output signal I1 according to the output signal I2. Therefore, the possibility that the detection accuracy of the input device X1 is lowered can be reduced.

  The first determination unit 115 has a role of determining whether or not an input operation has been performed. For example, a predetermined threshold value is recorded in the first determination unit 115. The first determination unit 115 determines that an input operation has been performed when it is determined that the output signal I1 corrected by the first correction unit 114 has reached a threshold value.

  Note that, as in the present embodiment, the first wiring conductor 5 is preferably located on the opposite side of the second wiring conductor 7 with the input region E1 interposed therebetween. According to such a configuration, it is possible to reduce the possibility that the first wiring conductor 5 and the second wiring conductor 7 overlap in plan view. For this reason, possibility that the 1st wiring conductor 5 and the 2nd wiring conductor 7 may interfere electrically may be reduced.

  Further, as in the present embodiment, a plurality of second detection electrode patterns 6 are provided corresponding to the plurality of first detection electrode pattern groups 4A, and the plurality of second detection electrode patterns 6 are independent from each other. Is preferred. According to such a configuration, the output signal I1 received by the first receiver 112 from one first detection electrode pattern group 4A is transmitted from the second detection electrode pattern 6 corresponding to the first detection electrode pattern group 4A to the second. 2 The correction can be made according to the output signal I2 received by the receiving unit 113. For this reason, the correction procedure in the first correction unit 114 can be simplified.

  In addition, the area of the second detection electrode pattern 6 in plan view is preferably substantially the same as the area of the first detection electrode pattern group 4A in plan view. According to such a configuration, the noise signal IX that flows through the first detection electrode pattern group 4A and the noise signal IX that flows through the second detection electrode pattern 6 when the finger F1 comes close to the first main surface 2A of the base 2. Can be made substantially the same. For this reason, the correction according to the area difference is not required, and the correction procedure in the first correction unit 114 can be simplified.

  In addition, the separation distance between the second detection electrode pattern 6 and the first detection electrode pattern 4 is preferably relatively small. Specifically, the distance between the second detection electrode pattern 6 and the first detection electrode pattern 4 is preferably half or less of the thickness of the insulating layer 8. Further, when the third detection electrode pattern 9 is provided directly on the second main surface 2B of the substrate 2 without providing the insulating layer 8, the separation distance between the second detection electrode pattern 6 and the first detection electrode pattern 4 is as follows. The thickness is preferably about 10 to 300 μm. According to such a configuration, it is possible to reduce the possibility that a capacitance is formed between the second detection electrode pattern 6 and the third detection electrode pattern 9 due to the fringe effect.

  Next, the operation of the input device X1 will be described with reference to FIG. FIG. 6 is a flowchart for explaining the operation of the input device X1.

  As illustrated in FIG. 6, the voltage supply unit 111 supplies the input signal Vin to the third detection electrode pattern 9 (Op1). Next, the first receiver 112 receives the output signal I1 output from the first detection electrode pattern group 4A according to Vin (Op2). In addition, the second receiving unit 113 receives the output signal I2 output from the second detection electrode pattern 6 according to Vin (Op3). In the present embodiment, for the first detection electrode pattern group 4A and the second detection electrode pattern 6 corresponding to the first detection electrode pattern group 4A, Op2 and Op3 are performed at the same timing. Here, when the finger F1 comes close to the first main surface 2A of the base 2, the capacitance C2 and the capacitance C4 change to a capacitance C2 ′ and a capacitance C4 ′. In addition, the noise signal IX flows through the first detection electrode pattern group 4A and the second detection electrode pattern 6 via the capacitance C5, the capacitance C6, and the capacitance C8. Therefore, the first correction unit 114 corrects the output signal I1 based on the output signal I2 (Op4). Thereby, the influence of the noise signal IX on the output signal I1 is canceled, and the change amount of the output signal I1 due to the change of the capacitor C2 and the capacitor C4 to the capacitor C2 ′ and the capacitor C4 ′ is calculated as a correction value. Next, the first determination unit 115 compares the threshold value recorded in the first determination unit 115 with the correction value in the first correction unit 114 (Op5), and determines that the correction value has reached the threshold value. (YES at Op5) An input operation is detected (Op6). On the other hand, when it is determined that the correction value has not reached the threshold value (NO in Op5), the operation is repeated from Op1. By such an operation, the possibility that the detection accuracy of the input device X1 is lowered can be reduced.

  Next, the display device Y1 including the input device X1 will be described with reference to FIG. FIG. 7 is a cross-sectional view illustrating a schematic configuration of the display device Y1 including the input device X1.

  As illustrated in FIG. 7, the display device Y1 according to the present embodiment includes an input device X1, a display panel 12, a backlight 13, a circuit board 14, and a first housing 15.

  The display panel 12 has a role of displaying an image or a moving image. The display panel 12 includes an upper substrate 12a, a lower substrate 12b, a liquid crystal layer 12c, and a sealing member 12d.

  The upper substrate 12a is disposed to face the second main surface 2B of the base 2 of the input device X1. The input device X1 may be provided on the upper substrate 12a via a fixing member. Examples of the fixing member include a double-sided tape, a thermosetting resin, an ultraviolet curable resin, or a stopper such as a screw. The lower substrate 12b is disposed to face the upper substrate 12a. Examples of the constituent material of the upper substrate 12a and the lower substrate 12b include a transparent resin material such as glass or plastic.

  The liquid crystal layer 12c is a display member layer for displaying an image, and is interposed between the upper substrate 12a and the lower substrate 12b. Specifically, the liquid crystal layer 12c is sealed in a region between the upper substrate 12a and the lower substrate 12b by the upper substrate 12a, the lower substrate 12b, and the sealing member 12d. The display panel 12 according to the present embodiment includes the liquid crystal layer 12c as the display member layer, but is not limited thereto. Instead of the liquid crystal layer 12c, a plasma generation layer, an organic EL layer, or the like may be provided.

  The backlight 13 has a role of entering light over the entire lower surface of the display panel 12. The backlight 13 is disposed behind the display panel 12. The backlight 13 includes a light source 13a and a light guide plate 13b. The light source 13a is a member that plays a role of emitting light toward the light guide plate 13b, and is composed of an LED (Light Emitting Diode). In addition, the light source 13a does not need to be comprised from LED, for example, may be comprised from the cold cathode fluorescent lamp, the halogen lamp, the xenon lamp, or EL (Electro-Luminescence). The light guide plate 13 b is a member that plays a role for guiding light from the light source 13 a substantially uniformly over the entire lower surface of the display panel 12. In the case where a display panel using self-luminous elements is used instead of the display panel 12, the backlight 13 is not necessary.

  The circuit board 14 has a role of supporting electronic components such as a control circuit for controlling the display panel 12 and the backlight 13, a resistor, or a capacitor, for example. The circuit board 14 is disposed behind the backlight 13. The control circuit disposed on the circuit board 14 is electrically connected to the display panel 12 and the backlight 13 by a flexible printed wiring board (not shown). The control IC 11 of the input device X1 may be provided on the circuit board 14.

  The first housing 15 has a role of supporting the input device X1 and a role of housing the display panel 12, the backlight 13, and the circuit board 14. The first housing 15 is formed so as to be partially opened, and the decorative layer 3 in the input device X1 is exposed in the opening. The display panel 12, the backlight 13, and the circuit board 14 are located in a region surrounded by the first housing 15 and the input device X1.

  Examples of the constituent material of the first housing 15 include a resin such as polycarbonate, or a metal such as stainless steel and aluminum.

  In this way, the display device Y1 can input various types of information by performing an input operation on the input area E1 of the input device X1 while seeing through the display panel 12 via the input device X1.

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

  Next, the mobile terminal Z1 including the display device Y1 will be described with reference to FIG. FIG. 8 is a perspective view of the portable terminal Z1 including the display device Y1.

  As shown in FIG. 8, the mobile terminal Z1 according to the present embodiment is a smartphone terminal. The mobile terminal Z1 is not limited to a smartphone terminal, and may be an electronic device such as a mobile phone, a tablet terminal, or a PDA (Personal Digital Assistant).

  The portable terminal Z1 includes a display device Y1, an audio input unit 201, an audio output unit 202, a key input unit 203, and a second housing 204.

  The voice input unit 201 has a role of inputting a user's voice and the like, and includes a microphone or the like. The audio output unit 202 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 203 is composed of mechanical keys. The key input unit 203 may be an operation key displayed on the display screen. The second housing 204 has a role of accommodating the display device Y1, the audio input unit 201, the audio output unit 202, and the key input unit 203. As a constituent material of the second casing 204, the same material as that of the first casing 15 may be used. The second housing 204 and the first casing 15 of the display device Y1 may be integrated.

  Here, an opening is provided in a part of the second housing 204, and the external connection terminal 205 is provided in the opening. For this reason, the portable terminal Z1 can be connected to an external electronic device such as a charger via the external connection terminal 205. Here, when an external electronic device is connected to the external connection terminal 205, the electronic device is connected to the ground potential in the input device X1. At this time, the ground potential in the input device X1 varies due to common mode noise. Since the mobile terminal Z1 includes the input device X1, it is possible to reduce the possibility that the detection accuracy of the input device X1 is lowered due to the noise.

  Note that the mobile terminal Z1 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 depending on a required function. Illustration and description of these details are omitted.

  The display device Y1 is not limited to the portable terminal Z1 described above. Various devices such as an electronic notebook, a personal computer, a copying machine, a game terminal device, a television, a digital camera, or a programmable display used in industrial applications can be used. The electronic device may be provided.

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

  [Modification 1] FIG. 9 is a plan view illustrating a schematic configuration of an input device X2 according to Modification 1. FIG. FIG. 10 is a block diagram illustrating a schematic configuration of the input device X2 according to the first modification. FIG. 11 is a flowchart illustrating the operation of the input device X2 according to the first modification. 9 to 11, configurations having the same functions as those in FIGS. 1, 4, and 6 are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, in FIG. 9, illustration of the decoration layer 3 and the insulating layer 8 is abbreviate | omitted for convenience of explanation. Moreover, in FIG. 9, the 1st wiring conductor 5, the 2nd wiring conductor 21, and the 3rd wiring conductor 10 are shown as a continuous line from a viewpoint of visibility of drawing.

  As illustrated in FIGS. 9 and 10, the input device X2 includes a second wiring conductor 21 instead of the second wiring conductor 7 included in the input device X1. In the input device X2, the control IC 11 further includes a second determination unit 116.

  The second wiring conductor 21 has the same role as the second wiring conductor 7. A plurality of second wiring conductors 21 are provided on the insulating layer 8 corresponding to the outer region E2. One end of the second wiring conductor 21 is electrically connected to the end portion of the second detection electrode pattern 6 located on the right side in FIG. Here, the plurality of second wiring conductors 21 are connected to each other. In the first modification, nine second wiring conductors 21 provided corresponding to the nine second detection electrode patterns 6 are aggregated into one wiring conductor and drawn out to the conduction region E3. Note that all the nine second wiring conductors 21 may not be connected to each other.

  In this way, when the plurality of second wiring conductors 21 are connected to each other, the number of wiring conductors drawn to the conduction region E3 can be reduced. For this reason, the outer side area | region E2 can be made relatively small and size reduction of the input device X2 is realizable.

  The second determination unit 116 has a role of determining whether or not the output signal I1 received by the first reception unit 112 has reached a predetermined value. Specifically, in the input device X2, a plurality of second wiring conductors 21 are connected to each other. For this reason, when the finger F1 comes close to the first main surface 2A of the base 2, it is determined which of the plurality of second detection electrode patterns 6 the output signal I2 has flowed to. I can't. Therefore, the second determination unit 116 determines whether or not the output signal I1 has reached a predetermined value, so that the first detection electrode pattern group 4A facing the finger F1 among the plurality of first detection electrode pattern groups 4A. Is determined. The first correction unit 114 corrects the output signal I1 for the first detection electrode pattern group 4A that is determined by the second determination unit 116 that the output signal I1 has reached a predetermined value.

  Here, the operation of the input device X2 will be described with reference to FIG.

  The input device X2 has Op7 in addition to Op1 to Op6 shown in FIG. Op7 is an operation flow located between Op2 and Op4. Specifically, for example, a predetermined threshold is recorded in the second determination unit 116. The output signal I1 received by the first reception unit 112 in Op2 is compared with the above threshold value in the second determination unit 116 (Op7). When the second determination unit 116 determines that the output signal I1 is equal to or greater than the threshold (YES at Op7), the output signal I1 determined to be equal to or greater than the threshold is corrected according to the output signal I2 (Op4). . On the other hand, when the second determination unit 116 determines that the output signal I1 is less than the threshold value (NO at Op7), the operation returns to Op2 and is repeated. As described above, since the input device X2 includes the second determination unit 116, it is possible to reduce the possibility that the detection accuracy is lowered even if the plurality of second wiring conductors 21 are connected to each other. .

  [Modification 2] FIG. 12 is a block diagram illustrating a schematic configuration of an input device X3 according to Modification 2. FIG. 13 is a flowchart illustrating the operation of the input device X3 according to the second modification. 12 and 13, the same reference numerals are given to configurations having the same functions as those in FIGS. 4 and 6, and detailed descriptions thereof are omitted.

  As shown in FIG. 12, in the input device X3, the control IC 11 further includes a second correction unit 117.

  The second correction unit 117 has a role of correcting the output signal I2 received by the second reception unit 113. Specifically, in the input device X3, the area of the second detection electrode pattern 6 in plan view and the area of the first detection electrode pattern group 4A in plan view are different from each other. For this reason, the noise signal Ix included in the output signal I1 is different from the noise signal Ix included in I2 included in the output signal I2. Therefore, the second correction unit 117 corrects the output signal I2 according to the ratio between the area of the second detection electrode pattern 6 in plan view and the area of the first detection electrode pattern group 4A in plan view. The correction value calculated by the correction is substantially the same as the noise signal Ix included in the output signal I1.

  Here, the operation of the input device X3 will be described with reference to FIG.

  The input device X3 has Op8 in addition to Op1 to Op6 shown in FIG. Op8 is an operation flow located between Op3 and Op4. Specifically, for example, the ratio between the area of the first detection electrode pattern group 4 </ b> A in plan view and the area of the second detection electrode pattern 6 in plan view is recorded in the second correction unit 117. The output signal I2 received by the second receiver 113 at Op3 is corrected according to the above ratio (Op8). That is, in Op8, the output signal I2 is converted into a correction value substantially the same as the noise signal Ix included in the output signal I1. Next, the noise signal Ix included in the output signal I1 is canceled from the output signal I1 based on the correction value (Op4). Thus, since the input device X3 includes the second correction unit 117, the area of the first detection electrode pattern group 4A in plan view and the area of the second detection electrode pattern 6 in plan view are different. However, it is possible to reduce the possibility that the detection accuracy is lowered.

  [Modification 3] Although the present specification has described the above embodiment, modification 1, and modification 2 individually and specifically, the present invention is not limited thereto, and the above embodiment, modification 1, and modification are described. An example in which matters individually described in Example 2 are appropriately combined is also described. That is, the input device according to the present invention is not limited to the input devices X1 to X3, and an input device that appropriately combines the matters individually described in the embodiment, the first modification, and the second modification. Including.

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

  Moreover, although this embodiment demonstrated portable terminal Z1 provided with input device X1, the portable terminal which concerns on this invention is not limited to this. The mobile terminal according to the present invention may include the input device X1 or the input device X2 instead of the input device X1.

X1 to X3 Input device Y1 Display device Z1 Mobile terminal E1 Input region E2 Outside region 4 First detection electrode pattern 4A First detection electrode pattern group 5 First wiring conductor 6 Second detection electrode pattern 7 Second wiring conductor 9 Third detection Electrode pattern 10 Third wiring conductor 11 Control IC (control unit)
111 Voltage supply unit 112 First reception unit 113 Second reception unit 114 First correction unit 115 First determination unit 116 Second determination unit 117 Second correction unit 12 Display panel 204 Second housing (housing)
205 External connection terminal

Claims (10)

A plurality of first detection electrode patterns that are adjacent to each other and electrically connected to each other;
A second detection electrode pattern provided between the first detection electrode patterns adjacent to each other, and spaced apart from the first detection electrode pattern;
A plurality of the first detection electrode patterns and the second detection electrode patterns spaced apart from each other, and a third detection electrode pattern intersecting the plurality of the first detection electrode patterns and the second detection electrode patterns in plan view; ,
A voltage supply unit configured to apply a voltage to the third detection electrode pattern; a first reception unit configured to receive a signal from the first detection electrode pattern based on a voltage applied from the voltage supply unit to the third detection electrode pattern; A second receiver for receiving a signal from the second detection electrode pattern based on a voltage applied to the third detection electrode pattern from the voltage supply unit; and a first receiver based on a signal received from the second receiver. A control unit having a first correction unit that corrects a signal received by the reception unit, and a first determination unit that determines that an input operation has been performed when the signal corrected by the first correction unit reaches a predetermined value; An input device with. An input region and an outer region located outside the input region;
The first detection electrode pattern, the second detection electrode pattern, and the third detection electrode pattern are provided in the input region,
Electrically connecting the first detection electrode patterns adjacent to each other, and a first wiring conductor located in the outer region;
The input device according to claim 1, further comprising: a second wiring conductor that is electrically connected to the second detection electrode pattern and located in the outer region.   The input device according to claim 2, wherein the first wiring conductor is located on the opposite side of the second wiring conductor across the input region. When the first detection electrode patterns adjacent to each other that are electrically connected to each other are used as a first detection electrode pattern group,
A plurality of the first detection electrode pattern groups are provided,
A plurality of the second detection electrode patterns are provided corresponding to the plurality of first detection electrode pattern groups,
A plurality of the second wiring conductors are provided corresponding to the plurality of third detection electrode patterns,
The input device according to claim 2, wherein the plurality of second wiring conductors are separated from each other. When the first detection electrode patterns adjacent to each other that are electrically connected to each other are used as a first detection electrode pattern group,
A plurality of the first detection electrode pattern groups are provided,
A plurality of the second detection electrode patterns are provided corresponding to the plurality of first detection electrode pattern groups,
A plurality of the second wiring conductors are provided corresponding to the plurality of third detection electrode patterns,
The input device according to claim 2, wherein the plurality of second wiring conductors are connected to each other. The control unit corrects a signal received by the second reception unit based on a ratio between an area of the first detection electrode pattern in plan view and an area of the second detection electrode pattern in plan view. Further comprising
The input device according to claim 1, wherein the first correction unit corrects the signal received by the first reception unit based on the signal corrected by the second correction unit. The control unit further includes a second determination unit that determines whether the signal received by the first reception unit has reached a predetermined value,
The first correction unit, when the second determination unit determines that the signal received by the first reception unit has reached a predetermined value, based on the signal received by the second reception unit. The input device according to claim 5, wherein correction is performed. A plurality of first detection electrode patterns that are adjacent to each other and electrically connected to each other;
A second detection electrode pattern provided between the first detection electrode patterns adjacent to each other, and spaced apart from the first detection electrode pattern;
A plurality of the first detection electrode patterns and the second detection electrode patterns spaced apart from each other, and a third detection electrode pattern intersecting the plurality of the first detection electrode patterns and the second detection electrode patterns in plan view; An input device. The input device according to any one of claims 1 to 8,
A display panel disposed opposite to the input device. The input device according to any one of claims 1 to 8,
A display panel disposed opposite to the input device.

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