JP2016001408A - Input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device capable of suppressing the variation in position detection accuracy and detection sensitivity in an input region.SOLUTION: The input device of the present invention includes: a substrate 20; a plurality of electrodes 21a-21f arranged in an input region 16 of the substrate 20; a terminal unit 29 formed in a non-input region 17 outside the input region 16; and a leader wire 27 for electrically connecting the electrodes 21a-21f to the terminal unit 29. The plurality of electrodes 21a-21f have a substantially equal outer shape, and sensitivity adjustment units 31a-31d are formed inside the outer shapes. Each of the sensitivity adjustment units 31a-31d has a large area for each of the electrodes 21a-21f having a small resistance value between it and the terminal unit 29.

Description

  The present invention relates to an input device, and more particularly, to an input device having a plurality of electrodes in which an input region of a base material is formed and lead wirings drawn from the electrodes.

  The following Patent Document 1 discloses a capacitance type input device in which a plurality of electrodes are connected by a bridge portion. FIG. 15 is a plan view of the input device of the first conventional example described in Patent Document 1. In FIG.

  As shown in FIG. 15, the input device 101 of the first conventional example includes a base material 102, and a first electrode 104 and a second electrode 105 formed in an input region 111 of the base material 102. The first electrodes 104 are arranged at intervals in the Y1-Y2 direction, and the first electrodes 104 adjacent in the Y1-Y2 direction are connected to each other by a connecting portion 124. The second electrodes 105 are arranged at intervals in the X1-X2 direction, and the second electrodes 105 adjacent in the X1-X2 direction are connected by a bridge portion 123. The connecting portion 124 and the bridge portion 123 are formed so as to intersect with each other in plan view, and are insulated via an insulating layer (not shown). A lead wire 106 is connected to the first electrode 104 and the second electrode 105, and the lead wire 106 is routed through the non-input region 112 and connected to the terminal portion 127.

  When the operator brings a finger or the like close to the input region 111, capacitance is generated between the finger and the first electrode 104 and between the finger and the second electrode 105. Based on the capacitance change at this time, it is possible to calculate the input position by the finger.

JP 2013-164827 A Republished patent WO2011 / 142333

  However, as shown in FIG. 15, the lead-out wiring 106 led out from the first electrode 104 and the second electrode 105 extends to the terminal portion 127 formed at the edge of the base material 102, and thus the lead-out wiring 106. The length differs depending on the positions of the electrodes 104 and 105. Since the resistance value of the lead-out wiring 106 is proportional to the length of the lead-out wiring 106, the resistance value between the electrodes 104 and 105 and the terminal portion 127 becomes a different value in each of the electrodes 104 and 105.

  In addition, in the plurality of first electrodes 104 connected by the connecting portion 124 and the plurality of second electrodes 105 connected by the bridge portion 123, the resistance value between each electrode 104, 105 and the terminal portion 127. Is different. Each electrode (for example, the first electrode 104a and the second electrode 105a in FIG. 15) connected to the lead wiring 106 has a relatively small resistance value with the terminal portion 127. On the other hand, each electrode located on the opposite side (for example, the first electrode 104b and the second electrode 105b) adds the resistance values of the electrodes 104 and 105 and the connecting portion 124 to the resistance value of the lead wiring 106. Therefore, the resistance value between the terminal portion 127 increases.

  As described above, the electrodes 104 and 105 located on the opposite side (Y1 side) to the terminal portion 127 shown in FIG. 15 and the electrodes located on the opposite side to the electrodes 104 and 105 connected to the respective extraction wirings 106. The resistance values between the terminal portions 127 tend to increase as the numbers 104 and 105 increase. Thus, if the resistance values between the electrodes 104 and 105 and the terminal portion 127 are different, variations in detection sensitivity of the electrodes 104 and 105 are likely to occur.

  Patent Document 2 discloses an input device having a curved surface panel. FIG. 16 shows an input device of a second conventional example described in Patent Document 2. In FIG. FIG. 16A is a cross-sectional view of the input device 201 of the second conventional example, and FIG. 16B is a plan view of the input device 201.

  As shown in FIG. 16A, the input device 201 of the second conventional example includes a surface panel 220 that is convexly curved, a first base member 221 and a first base member 221 that are flatly bonded to the lower surface side of the surface panel 220. Two base materials 222 are provided. A first electrode 240 is formed on the first base material 221, and a second electrode 242 is formed on the second base material 222. In the input device 201 of the second conventional example, the distance between the surface of the front panel 220 and the electrodes 240 and 242 differs depending on the input position. This difference in distance appears as a difference in detection sensitivity, and an area with good detection sensitivity and a bad area are generated in the surface of the front panel 220 when an input operation is performed.

  Therefore, as shown in FIG. 16B, in the input device 201 of the second conventional example, the electrodes 240 and 242 are formed with different shapes, and the electrodes (240b, 240c, 242c) is formed with a larger area than the electrodes (240a, 240d, 242a, 242e) located at the peripheral edge. Thereby, the uniformity of detection sensitivity can be improved.

  However, in the case of a flat surface panel or when the distance between the surface of the surface panel and each electrode is formed to be constant, for the purpose of reducing variation in detection sensitivity of each electrode, FIG. As shown, when the detection sensitivity is made uniform by changing the size of each electrode, the outer shape of each electrode is different and the detection range varies, resulting in variations in position detection accuracy within the surface panel.

  An object of the present invention is to provide an input device that solves the above-described problems and can suppress variations in position detection accuracy and detection sensitivity in an input region.

  The input device of the present invention includes a base material, a plurality of electrodes arranged in the input region of the base material, a terminal portion formed in a non-input region outside the input region, the electrode, and the terminal portion. The plurality of electrodes have substantially the same outer shape, and a sensitivity adjustment portion is formed inside the outer shape, the sensitivity adjustment portion, The smaller the resistance value between the electrode and the terminal portion, the larger the area.

  According to this, since the plurality of electrodes have substantially the same outer shape, the uniformity of the arrangement of the plurality of electrodes can be improved, and variation in position detection accuracy in the input region can be suppressed. In addition, a sensitivity adjustment part is formed inside the outer shape of the electrode, and the area of the sensitivity adjustment part is changed according to the resistance value between the electrode and the terminal part, thereby detecting each electrode due to the difference in resistance value. Variation in sensitivity is suppressed to a small level. Therefore, according to the input device of the present invention, it is possible to suppress variations in position detection accuracy and detection sensitivity in the input region.

  The sensitivity adjusting unit is preferably an opening formed in the electrode. According to this, since the opening does not contribute to the detection of the input position, the detection sensitivity is suppressed to be low by forming the area of the opening larger as the resistance value between the electrode and the terminal is smaller. . Therefore, an opening is formed so as to reduce the variation in detection sensitivity for an electrode having a large resistance value with respect to the terminal portion, and variation in detection sensitivity in the entire input region can be suppressed.

  It is preferable that a floating electrode separated from the electrode is formed inside the opening. According to this, by forming the floating electrode, the contrast difference between the electrode and the opening provided with no electrode is reduced, and the invisibility of the electrode can be improved. In addition, since the floating electrode is separated from the electrode, the input position is not detected, or even when the electrode and the floating electrode are capacitively coupled, the change in the capacitance of the electrode due to the floating electrode can be suppressed small. Therefore, even when a floating electrode is provided, variation in detection sensitivity can be suppressed.

  The sensitivity adjusting unit is preferably a slit formed on the outer periphery of the electrode. According to this, detection sensitivity can be suppressed by increasing the area of the slit, and variations in detection sensitivity of each electrode in the input area can be suppressed. Even when the slits are provided, the outer shapes of the electrodes are formed to be substantially the same, so that variation in position detection accuracy can be suppressed.

  In the electrode in which the sensitivity adjustment unit is formed, it is preferable that a plurality of the sensitivity adjustment units are formed. According to this, compared with the case where one sensitivity adjusting portion is formed for each electrode, the sensitivity adjusting portions can be formed in a distributed manner in one electrode, so that the detection sensitivity in one electrode can be increased. It is possible to improve the position detection accuracy by suppressing the variation of.

  The sensitivity adjustment unit is preferably formed symmetrically with respect to the center of the electrode. According to this, the distribution of detection sensitivity in one electrode can be made uniform, and the position detection accuracy can be improved.

  The plurality of electrodes are arranged at intervals in a first direction in the input region of the substrate, and the electrodes adjacent to each other in the first direction are electrically connected and connected to each other. The lead-out wiring is led out from the electrode located on the outermost side among the electrode rows composed of the electrodes, and the sensitivity adjusting unit is disposed at a position near the electrode from which the lead-out wiring is drawn out. It is preferable that the electrode has a larger area. According to this, the detection sensitivity is suppressed to be lower by forming the area of the sensitivity adjustment portion larger as the electrode is arranged closer to the electrode from which the extraction wiring is extracted. Therefore, variation in detection sensitivity due to a difference in resistance value between each electrode of the electrode array and the terminal portion can be suppressed to be small, and variation in detection sensitivity in the input region can be suppressed.

  The lead-out wiring is drawn out from each of the plurality of electrodes, and the lead-out wiring extends from the input region toward the non-input region, and the shorter the lead-out wiring, the shorter the length of each of the plurality of electrodes. It is preferable that the area of the sensitivity adjusting portion formed in the above is formed large. According to this, the detection sensitivity is suppressed to be lower as the length of the lead-out wiring is shorter, that is, as the resistance value between each electrode and the terminal portion is smaller. Therefore, variation in detection sensitivity due to the resistance value of the lead wiring connected to each electrode can be suppressed.

  According to the input device of the present invention, it is possible to suppress variations in position detection accuracy and detection sensitivity in the input region.

It is a top view of the input device in a 1st embodiment of the present invention. It is sectional drawing when it cut | disconnects by the II-II line | wire of FIG. 1, and it sees from the arrow direction. It is a partial enlarged plan view of the 1st electrode. It is a partial enlarged plan view of the 2nd electrode. It is the elements on larger scale of the 1st electrode which shows the 1st modification in a 1st embodiment. It is the elements on larger scale of the 1st electrode which shows the 2nd modification. It is the elements on larger scale of the 1st electrode which shows the 3rd modification. It is the elements on larger scale of the 1st electrode which shows the 4th modification. It is the elements on larger scale of the 1st electrode which shows the 5th modification. It is the elements on larger scale of the 1st electrode which shows the 6th modification. It is a top view of the input device in a 2nd embodiment. FIG. 10 is a partial enlarged cross-sectional view of a first electrode, showing a first modification example of the second embodiment. It is the elements on larger scale of the 1st electrode which shows the 2nd modification. It is a disassembled perspective view of the input device of 3rd Embodiment. It is a top view of the input device in the 1st conventional example. (A) It is sectional drawing of the input device in a 2nd prior art example, (b) It is a top view of the input device in a 2nd prior art example.

  Hereinafter, an input device according to a specific embodiment of the present invention will be described with reference to the drawings. In addition, the dimension of each drawing is changed and shown suitably.

<First Embodiment>
FIG. 1 is a plan view of the input device according to the first embodiment. FIG. 2 is a cross-sectional view of the input device as viewed from the direction of the arrow cut along line II-II in FIG. As shown in FIG. 1, the input device 10 according to the present embodiment includes a base material 20 and a plurality of first electrodes 21 a to 21 f and second electrodes 22 a to 22 g formed on the base material 20. The first electrodes 21 a to 21 f and the second electrodes 22 a to 22 g are each formed in a rhombus shape and are arranged in the input region 16 of the substrate 20.

  The first electrodes 21a to 21f are arranged at intervals in the X1-X2 direction, and the first electrodes 21a to 21f adjacent in the X1-X2 direction are connected to each other by the bridge portion 23. The first electrode array 18 including the plurality of connected first electrodes 21a to 21f extends in the X1-X2 direction, and a plurality of first electrode arrays 18 are arranged at intervals in the Y1-Y2 direction. Further, the second electrodes 22a to 22g are arranged at intervals in the Y1-Y2 direction, and the second electrodes 22a to 22g adjacent to each other in the Y1-Y2 direction are connected to each other by a narrow connecting portion 24. Has been. The second electrode array 19 including the plurality of connected second electrodes 22a to 22g extends in the Y1-Y2 direction, and a plurality of second electrode arrays 19 are arranged at intervals in the X1-X2 direction.

  As shown in FIG. 1, the first electrodes 21 a to 21 f and the second electrodes 22 a to 22 g are formed on the same base material 20, and the bridge portion 23 and the connecting portion 24 are formed to intersect each other. Yes. In addition, as shown in FIG. 2, an insulating layer 26 is provided so as to cover the connecting portion 24 at a portion where the connecting portion 24 and the bridge portion 23 intersect, and the connecting portion 24 and the bridge portion 23 are insulated from each other. It is electrically insulated through layer 26.

In this embodiment, PET (polyethylene terephthalate) and COP (cyclic polyolefin) which are transparent resin materials can be used as the base material 20, and it is formed in a film shape. The plurality of first electrodes 21a to 21f and the second electrodes 22a to 22g are formed by a thin film method such as sputtering or vapor deposition using a transparent conductive material such as ITO (Indium Tin Oxide), SnO ₂ , or ZnO. can do. In addition, as the plurality of first electrodes 21a to 21f and the second electrodes 22a to 22g, an ink having any one of Ag nanowires, carbon nanotubes, PEDOT, and graphene is used, and printing methods such as screen printing and inkjet printing are used. It is also possible to form.

  As shown in FIG. 1, the lead-out wiring 27 is drawn out from the first electrode 21 a arranged on the outermost side (X1 side or X2 side) in the first electrode row 18. Further, in the second electrode row 19, the lead-out wiring 27 is drawn from the second electrode 22 a arranged on the most Y2 side. The lead wire 27 is routed around the non-input area 17 outside the input area 16 and is connected to the terminal portion 29. A flexible printed circuit board (not shown) is connected to the terminal portion 29 and is connected to an external circuit such as an IC.

  As the lead-out wiring 27 and the terminal portion 29, a metal material, an alloy material having good conductivity, or a laminate of these materials can be used. For example, Ag, Cu, CuNi, Cu / CuNi, CuNi / Cu / CuNi Ti / Au or the like can be selected. Moreover, it can also be set as the structure which laminated | stacked metal materials, such as Cu, on transparent conductive materials, such as ITO.

  As shown in FIG. 2, the surface panel 13 is bonded to the base material 20 via the optical adhesive layer 40. The front panel 13 is formed in a flat plate shape using a translucent resin material or glass material, and a colored decorative layer 14 is formed on the back side of the front panel 13. The decorative layer 14 is formed in the non-input area 17 of the front panel 13 and prevents the lead-out wiring 27 from being visually recognized from the outside.

  In the present embodiment, the operator can perform an input operation in a state where a finger or the like is brought into contact with the surface of the front panel 13 or close to the front panel 13 without being touched. At this time, a capacitance is generated between the finger and the first electrodes 21a to 21f, or between the finger and the second electrodes 22a to 22g. Input position information can be detected based on the capacitance change at this time. The detection method can be either a self-capacitance method or a mutual capacitance method. For example, the X coordinate can be detected based on the capacitance change with the second electrode row 19, and the Y coordinate can be detected based on the capacitance change with the first electrode row 18. (Self-capacitance method). In addition, a driving voltage is applied to one electrode of the first electrode array 18 or the second electrode array 19, and an input coordinate is detected by detecting a change in capacitance between the first electrode array 18 and the second electrode array 19 with a finger or the like. (Mutual capacity method).

  FIG. 3 is a partially enlarged plan view of the first electrode. FIG. 4 is a partially enlarged plan view of the second electrode. 3 and 4 show the first electrodes 21a to 21f and the second electrodes 22a to 22g individually for the sake of clarity, but as described above, in the present embodiment, the first electrodes 21a to 21f are shown. 21 f and the second electrodes 22 a to 22 g are formed on the same base material 20.

  As shown in FIGS. 3 and 4, in the input device 10 of the present embodiment, the plurality of first electrodes 21 a to 21 f and the second electrodes 22 a to 22 g are formed so as to have substantially the same rhombus outer shape. In addition, an opening 31 is provided as a sensitivity adjustment portion inside the outer shape. In the present embodiment, the opening 31 is circular, and the center of the opening 31 and the center of the first electrodes 21a to 21f or the second electrodes 22a to 22g are formed to coincide with each other.

  As shown in FIG. 3, in the first electrodes 21 a to 21 d of the first electrode array 18, the openings 31 are formed with different areas. Moreover, the opening part 31 is not formed in the 1st electrodes 21e and 21f located on the opposite side with respect to the 1st electrode 21a to which the extraction wiring 27 was connected. As shown in FIG. 3, the opening 31b of the first electrode 21b has a larger area than the opening 31c formed in the first electrode 21c, and the opening of the first electrode 21a is larger than the opening 31b. The part 31a is formed with a large area. As described above, the opening 31 formed in the first electrodes 21a to 21f has a larger area as the first electrodes 21a to 21f arranged closer to the first electrode 21a from which the lead wiring 27 is drawn. Is formed.

  As shown in FIG. 3, the resistance value between the first electrode 21 a and the terminal portion 29 in the first electrode array 18 depends only on the resistance value of the lead-out wiring 27. On the other hand, in the 1st electrode row | line | column 18, each 1st electrode located between 1st electrode 21a-21f and the extraction wiring 27 is separated from the 1st electrode 21a from which the extraction wiring 27 is extracted. The resistance values of 21a to 21f and the bridge portion 23 are added, and the resistance value increases. That is, in the present embodiment, the area of the opening 31 as the sensitivity adjustment unit is formed larger as the resistance value between the first electrodes 21a to 21f and the terminal unit 29 is smaller.

  As shown in FIG. 4, openings 32 a to 32 d are formed in the second electrodes 22 a to 22 e of the second electrode row 19 as well as the first electrodes 21 a to 21 f. In the second electrodes 22a to 22e, the openings 32a to 32d are arranged closer to the second electrode 22a from which the lead-out wiring 27 is drawn (Y2 side in FIG. 4). The area is large. That is, the electrode 32 having a smaller resistance value between the second electrodes 22a to 22e and the terminal portion 29 has a larger area of the opening 32 as the sensitivity adjustment portion.

  According to the input device 10 of this embodiment, since the plurality of first electrodes 21a to 21f and the second electrodes 22a to 22g have substantially the same outer shape, the plurality of first electrodes 21a to 21f, And the detection range of the 2nd electrodes 22a-22g can be made uniform, and the dispersion | variation in the position detection accuracy in the input area 16 can be suppressed.

  Further, as shown in FIGS. 3 and 4, openings 31 and 32 are provided as sensitivity adjusting portions inside the outer shapes of the first electrode 21 and the second electrode 22, and the electrodes 21 and 22 and the terminal portions are provided. The areas of the openings 31 and 32 are made different according to the resistance value between them. The openings 31 and 32 do not contribute to the detection of the input position because the electrodes 21 and 22 are not formed and no capacitance is formed during the input operation. Therefore, the detection sensitivity is lowered by forming the areas of the openings 31 and 32 larger as the electrodes closer to the electrodes 21 a and 22 a having a smaller resistance value between the electrodes 21 and 22 and the terminal portion 29. Therefore, the electrodes 31f and 22g having a large resistance value with respect to the terminal portion 29 are formed such that the areas of the openings 31 and 32 are larger as the electrodes are closer to the electrodes 21a and 22a so that the difference in detection sensitivity is smaller. Thus, variation in detection sensitivity in the entire input region 16 can be suppressed.

  Therefore, according to the input device 10 of the present embodiment, it is possible to suppress variations in position detection accuracy and detection sensitivity in the input region 16.

  In the present embodiment, the openings 31 and 32 are formed in both the first electrode 21 and the second electrode 22, but the present invention is not limited to this. The configuration may be such that the opening 31 or the opening 32 is formed in either the first electrode 21 or the second electrode 22.

  FIG. 5 is a partially enlarged plan view of the first electrode 21 showing a first modification of the first embodiment. In the first modification, a plurality of openings 31a to 31c are formed as sensitivity adjustment portions in the first electrodes 21a to 21c, respectively. In addition, the openings 31a to 31c of the present modification are formed in a rhombus similar to the first electrodes 21a to 21c.

  Also in this modification, the area of each of the plurality of openings 31a to 31c is formed larger as it is arranged closer to the first electrode 21a to which the lead wiring 27 is connected. Thereby, in the electrode 21, the opening portion 31 is formed larger as the electrode 21 has a smaller resistance value with respect to the terminal portion 29, and variations in detection sensitivity in the entire input region 16 can be suppressed.

  Further, compared to the case where one opening 31 is formed for each electrode 21, in this modification, the openings 31 can be formed dispersed in the electrode 21. Further, as shown in FIG. 5, the opening 31 is formed symmetrically with respect to the center of the electrode 21. Therefore, it is possible to improve the position detection accuracy by making the distribution of detection sensitivity within one electrode uniform.

  Further, the present invention is not limited to the case where the openings 31 are arranged symmetrically in one electrode 21. For example, when the gradient of detection sensitivity in the plane of the input region 16 is large, the openings 31 in one electrode 21 By making the arrangement unevenly distributed, it is possible to make the distribution of the detection sensitivity within one electrode 21 uniform.

  FIG. 6 is a partially enlarged plan view of the first electrode, showing a second modification of the first embodiment. In the present modification, as in the first modification, a plurality of openings 31a to 31c are provided in the first electrodes 21a to 21c. In this modification, the detection sensitivity is adjusted by changing the total area of the openings 31a to 31c by changing the number of the openings 31a to 31c in each electrode. As shown in FIG. 6, as the first electrode 21a to which the lead wiring 27 is connected is approached, more openings 31a to 31c are formed. Thereby, the variation in detection sensitivity in the input region 16 is suppressed by changing the area of the opening 31 so as to reduce the variation in detection sensitivity for the electrode 21 having a large resistance value with respect to the terminal portion 29. be able to.

  In addition, as shown in FIG. 6, by forming a large number of openings 31a to 31c having a relatively small area, a contrast difference between the portions where the first electrodes 21a to 21c are present and the openings 31a to 31c is visually recognized. This makes it difficult to achieve a good appearance.

  FIG. 7 is a partially enlarged plan view of the first electrode, showing a third modification of the first embodiment. As shown in FIG. 7, in the third modification, floating electrodes 36a to 36c that are separated from the electrodes 21a to 21c are formed inside the openings 31a to 31c. The floating electrodes 36a to 36c are made of the same material as the electrodes 21a to 21c, and for example, a transparent conductive material such as ITO is used.

  By forming the floating electrodes 36a to 36c, the difference in contrast between the electrode 21 and the opening 31 where the electrode 21 is not provided is reduced, and visibility can be improved. Further, since the floating electrode 36 is separated from the electrode 21, the input position is not detected, or even when the electrode 21 and the floating electrode 36 are capacitively coupled, the electrostatic capacitance of the electrode 21 by the floating electrode 36. Changes are kept small. Therefore, even when the floating electrode 36 is provided, variations in detection sensitivity in the input region 16 can be suppressed.

  FIG. 8 is a partially enlarged plan view of the first electrode, showing a fourth modification of the first embodiment. In the fourth modification, a plurality of openings 31a to 31c are formed in each of the electrodes 21a to 21c, and floating electrodes 36a to 36c are formed in each of the plurality of openings 31a to 31c.

  According to this, the distribution of detection sensitivity in one first electrode 21a to 21c is made uniform to improve the position detection accuracy, and the difference in contrast between the one electrode 21a to 21c is made uniform, so that the electrode is invisible. Can be improved.

  FIG. 9 is a partially enlarged plan view of the first electrode, showing a fifth modification of the first embodiment. As shown in FIG. 9, in the fifth modified example, similarly to the second modified example shown in FIG. 6, a plurality of openings 31a to 31c are formed in the same shape, and the number of openings 31a to 31c is set. The sensitivity is adjusted by changing. Then, floating electrodes 36a to 36c are formed in the respective openings 31a to 31c.

  As shown in FIG. 9, by forming the openings 31a to 31c in the same shape and forming the floating electrodes 36a to 36c in the same shape, the difference in contrast in the first electrodes 21a to 21c is uniform. And invisibility of the electrode can be improved. In addition, the capacitance of the first electrodes 21a to 21c and the floating electrodes 36a to 36c can be increased by forming the areas of the floating electrodes 36a to 36c constant compared to the case where the areas of the floating electrodes 36a to 36c are made different. It is easy to control the coupling to a predetermined value or not to capacitive coupling.

  FIG. 10 is a partially enlarged plan view of the first electrode, showing a sixth modification of the first embodiment. The sixth modification is different in that the sensitivity adjustment unit is slits 38a to 38c formed on the outer circumferences of the first electrodes 21a to 21c. As shown in FIG. 10, the slits 38 a to 38 c are formed to extend from the outer periphery of the first electrodes 21 a to 21 c toward the central portion, and the first electrode 21 c, the first electrode 21 b, the first electrode The number of slits 38c, 38b, 38a increases in the order of the electrode 21a.

  In this modification, the total area of the slits 38a to 38c is formed larger as the resistance value between the first electrodes 21a to 21c and the terminal portion 29 (not shown in FIG. 10) is smaller. For this reason, the detection sensitivity of the first electrode 21 is suppressed so that the detection sensitivity coincides with the electrode 21 having a large resistance value between the first electrode 21 and the terminal portion 29. Therefore, variation in detection sensitivity in the input region 16 can be suppressed by changing the areas of the slits 38a to 38c. The shape of the slits 38a to 38c is not limited to a straight line, and may be, for example, a bent shape or an arc shape.

  Even when the slits 38a to 38c are formed, the substantial outer shape for detecting the input operation of the first electrodes 21a to 21c is the first electrode 21a to 21c when the slits 38a to 38c are not formed. It is almost the same as the external shape. Therefore, variation in position detection accuracy of the first electrodes 21a to 21c can be suppressed.

  5 to 10 all show the first electrode 21, but the second electrode 22 is similarly formed with a plurality of openings, floating electrodes, or slits. Can do. In each modification shown in FIGS. 5 to 10, the opening 31, the floating electrode 36, and the slit 38 are all formed symmetrically with respect to the center of the first electrode 21, but are not limited thereto. For example, when the sensitivity gradient in the input region 16 is steep, the sensitivity adjustment unit (opening 31, floating electrode 36, slit 38) in the first electrode 21 can be biased to make the sensitivity uniform. .

<Second Embodiment>
FIG. 11 is a plan view of the input device according to the second embodiment. The input device 11 of this embodiment includes a base material 50 and a plurality of first electrode rows 48 and second electrode rows 49 formed in the input region 16 of the base material 50. The first electrode array 48 includes a plurality of first electrodes 51a to 51f arranged at a constant interval in the Y1-Y2 direction. The second electrode array 49 is formed extending in the Y1-Y2 direction, and is arranged adjacent to the first electrode array 48 (first electrodes 51a to 51f) with a gap. When the adjacent first electrode row 48 and second electrode row 49 are used as one set of electrodes, a plurality of the set of electrodes are arranged at intervals in the X1-X2 direction.

  A first lead wire 56 is drawn from each of the first electrodes 51 a to 51 f and the second electrode row 49 of the first electrode row 48, and the first lead wire 56 is drawn from the input region 16 to the non-input region. 17 is extended. The first lead wiring 56 is electrically connected to the terminal portion 59 via the second lead wiring 57 formed in the non-input region 17.

  In the present embodiment, the first electrode array 48 and the second electrode array 49 are formed on the same surface of the base material 50, and between the adjacent first electrode array 48 and second electrode array 49. Capacitance is formed in In the mutual capacitance detection method, the first electrodes 51a to 51f are used as drive electrodes, and a drive voltage is sequentially applied to the first electrodes 51a to 51f in the Y1 direction or the Y2 direction at a constant cycle. The electrode array 49 is used as a detection electrode. Alternatively, the second electrode array 49 is used as a drive electrode, and a drive voltage is sequentially applied to the second electrode array 49 in the X1 direction or the X2 direction at a constant cycle, and the first electrodes 51a to 51f are Used as detection electrode.

  As shown in FIG. 11, also in the present embodiment, the first electrodes 51 a to 51 d are provided with openings 33 a to 33 d as sensitivity adjustment units. The openings 33a to 33d are formed so that the areas of the first electrodes 51a to 51d located on the Y1 side are larger. That is, the area of the openings 33a to 33d is increased as the length of the first lead wiring 56 connected to the first electrodes 51a to 51d is shorter. Note that the opening 33 is not formed in the first electrodes 51e and 51f that are arranged on the Y2 side and have a long first lead wiring 56 that is connected.

  Also in the present embodiment, by forming the openings 33a to 33d, the terminals are controlled so as to suppress variations in detection sensitivity with respect to the first electrodes 51e and 51f having a large resistance value with the terminal portion 59. The detection sensitivity of the first electrodes 51a to 51d having a small resistance value with respect to the portion 29 (the length of the first extraction wiring 56 is short) is suppressed. Therefore, variation in detection sensitivity in the input region 16 can be suppressed.

  FIG. 12 is a partially enlarged plan view of the first electrode 51 showing a first modification of the second embodiment. As shown in FIG. 12, a plurality of openings 33a to 33c are formed in each of the first electrodes 51a to 51c, and the shorter the length of the first lead wiring 56, the more the openings 33a to 33c have. The total area has increased. Thereby, variation in detection sensitivity in the input region 16 can be suppressed, and the distribution of detection sensitivity in each of the first electrodes 51a to 51c can be made uniform to improve position detection accuracy.

  FIG. 13 is a partially enlarged plan view of the first electrode, showing a second modification of the second embodiment. As shown in FIG. 13, floating electrodes 37 a to 37 c are formed in the openings 33 a to 33 c so as to be separated from the first electrodes 51 a to 51 c. Thereby, the difference in contrast between the electrode 51 and the opening 33 where the electrode 51 is not provided is reduced, and the invisibility of the electrode can be improved. Further, since the floating electrode 37 is separated from the electrode, the input position is not detected, and the detection sensitivity can be made uniform even when the floating electrode 37 is provided.

  In the present embodiment, the present invention is not limited to the first and second modifications. For example, similarly to FIG. 6, a plurality of openings 33 a to 33 c having the same area are formed in each of the first electrodes 51 a to 51 c, The number of openings 33a to 33c may be varied. Or similarly to FIG. 10, it can change suitably, such as forming a slit in 1st electrode 51a-51c instead of opening part 33a-33c.

<Third Embodiment>
FIG. 14 is an exploded perspective view of the input device according to the third embodiment. The input device 10 according to the first embodiment and the input device 11 according to the second embodiment detect the input position by forming the first electrode and the second electrode on one base material, but the present invention is not limited to this. Not. As illustrated in FIG. 14, the input device 12 of the third embodiment includes a first base 63 and a second base 64, and the first base 63 and the second base 64 Are bonded via the optical adhesive layer 41.

  In the input region 16 of the first base material 63, a plurality of first electrode rows 18 extending in the X1-X2 direction are formed. The first electrode array 18 is configured by connecting a plurality of first electrodes 21 a to 21 d by a connecting portion 25. A plurality of second electrode rows 19 extending in the Y1-Y2 direction are formed in the input region 16 of the second base material 64. The second electrode array 19 is configured by connecting a plurality of second electrodes 22 a to 22 e by a connecting portion 24. By bonding the first base material 63 and the second base material 64 together, a capacitance is formed between the first electrodes 21a to 21d and the second electrodes 22a to 22e, and the above-described first The input position information can be detected by the same method as in the embodiment.

  As shown in FIG. 14, openings 31 a to 31 c are formed as sensitivity adjustment portions in the first electrodes 21 a to 21 c, respectively, and the openings 31 a to 31 c are formed between the first electrodes 21 a to 21 c and the terminal portion 29. The smaller the resistance value between, the larger the area. That is, the area of the openings 31a to 31c is formed larger as the electrode is disposed closer to the electrode to which the lead wiring 27 is connected (the first electrode 21a located on the X1 side or the X1 side shown in FIG. 14). ing. Thereby, the dispersion | variation in the detection sensitivity resulting from the difference in resistance value between the 1st electrodes 21a-21c and the terminal part 29 is suppressed small. Therefore, variation in detection sensitivity in the input region 16 of the first base 63 is suppressed.

  Similarly, in the second base material 64, openings 32a to 32c are formed in the second electrodes 22a to 22c. The openings 32a to 32c are formed to have a larger area as the resistance value between the second electrodes 22a to 22c and the terminal portion 29 is smaller. That is, the area of the openings 31a to 31c is formed larger as the electrode is located closer to the electrode to which the lead wiring 27 is connected (second electrode 22a located on the Y2 side shown in FIG. 14). Thereby, the dispersion | variation in the detection sensitivity in the input area 16 of the 2nd base material 64 is suppressed.

  Further, as shown in FIG. 14, the first electrodes 21 a to 21 d and the second electrodes 22 a to 22 e are formed with the same outer shape, so that the arrangement of the plurality of first electrodes 21 and the second electrodes 22 is arranged. Uniformity can be improved, and variations in position detection accuracy in the input region 16 can be suppressed. Therefore, also in the input device 12 of this embodiment, it is possible to suppress variations in position detection accuracy and detection sensitivity in the input region 16.

10, 11, 12 Input device 13 Front panel 16 Input area 17 Non-input area 18, 48 First electrode array 19, 49 Second electrode array 20, 50 Base material 21, 21a-21e, 51, 51a-51f First 1 electrode 22, 22a to 22f, 52 second electrode 23 bridge portion 24, 25 connecting portion 27 lead wire 29, 59 terminal portion 31, 32, 33 opening portion 36, 37 floating electrode 38 slit 56 first lead wire 57 2nd lead-out wiring 63 1st base material 64 2nd base material

Claims (8)

Electrical connection between the base material, the plurality of electrodes arranged in the input area of the base material, the terminal part formed in the non-input area outside the input area, and the electrode and the terminal part And lead wiring
The plurality of electrodes have substantially the same outer shape, and a sensitivity adjustment portion is formed inside the outer shape,
The input device according to claim 1, wherein the sensitivity adjustment unit is formed such that an electrode having a smaller resistance value between the electrode and the terminal unit has a larger area.   The input device according to claim 1, wherein the sensitivity adjustment unit is an opening formed in the electrode.   The input device according to claim 2, wherein a floating electrode separated from the electrode is formed inside the opening.   The input device according to claim 1, wherein the sensitivity adjustment unit is a slit formed on an outer periphery of the electrode.   5. The input device according to claim 1, wherein a plurality of the sensitivity adjustment units are formed in the electrode in which the sensitivity adjustment unit is formed. 6.   The input device according to claim 5, wherein the sensitivity adjustment unit is formed symmetrically with respect to a center of the electrode. The plurality of electrodes are arranged at intervals in a first direction in the input region of the substrate, and the electrodes adjacent to each other in the first direction are electrically connected and connected to each other. The lead-out wiring is drawn out from the electrode located on the outermost side among the electrode rows of the electrodes,
The area of the sensitivity adjustment unit is larger as an electrode arranged in a position closer to an electrode from which the extraction wiring is extracted in the electrode row. The input device according to item 1. The lead-out wiring is led out from each of the plurality of electrodes, and the lead-out wiring extends from the input area toward the non-input area,
The area of the said sensitivity adjustment part formed in each of these electrodes is formed so that the length of the said extraction wiring is short, The any one of Claims 1-6 characterized by the above-mentioned. Input device.