JP6647879B2 - Conductive film, touch panel, and display device - Google Patents

Description

  The present invention relates to a conductive film including a plurality of electrode wires, a touch panel including the conductive film, and a display including the touch panel.

  A display device using a touch panel as an input device includes a display panel for displaying an image, and the touch panel overlaid on the display panel. As a method of detecting a contact position of a finger or the like on a touch panel, a capacitance method of detecting a contact of a finger or the like with an operation surface of the touch panel as a change in capacitance is widely used. In the capacitive touch panel, the conductive film included in the touch panel includes a plurality of first electrodes extending along a first direction, a plurality of second electrodes extending along a second direction orthogonal to the first direction, A transparent dielectric layer sandwiched between the first electrode and the second electrode; Then, a change in capacitance between one first electrode and each of the plurality of second electrodes is detected for each first electrode, and a contact position of a finger or the like on the operation surface is detected.

  In one example of such a conductive film, each of the plurality of first electrodes includes a plurality of first electrode lines extending along the first direction, and each of the plurality of second electrodes extends along the second direction. It is composed of a plurality of second electrode lines. As the electrode wire, a thin wire made of a metal such as silver or copper is used. By using metal as the material of the electrode wires, quick response and high resolution can be obtained when detecting the contact position, and the touch panel can be made larger and the manufacturing cost can be reduced.

  By the way, in a configuration in which the electrode lines are formed of a metal that absorbs or reflects visible light, a plurality of first electrode lines and a plurality of second electrode lines are orthogonal to each other when viewed from the operation surface of the touch panel. The shape of the pattern is visually recognized. On the other hand, even in a display panel on which a touch panel is stacked, a black matrix that partitions a plurality of pixels along the first direction and the second direction is visually recognized as a lattice pattern.

  At this time, the interval between the first electrode lines adjacent to each other is generally different from the interval in the second direction between the pixels adjacent to each other, and the interval between the second electrode lines adjacent to each other is also different. Is different from the interval in the first direction between mutually adjacent pixels. Then, when viewed from the operation surface of the touch panel, the lattice-shaped periodic structure formed by the first electrode lines and the second electrode lines and the lattice-shaped periodic structure that divides the pixels are overlapped to form two periodic structures. Misalignment may induce moire. When moiré is visually recognized, the quality of an image visually recognized on the display device is reduced.

As one method of suppressing such moiré from being visually recognized, there is a method of suppressing the occurrence of moiré by breaking the periodicity of the periodic structure of the electrode wires.
For example, in the touch panel described in Patent Document 1, each of the first electrode line and the second electrode line is a broken line, and the periodic structure formed from these electrode lines has a polygonal repeating structure different from a rectangle. Have. As a result, the periodicity of the periodic structure of the electrode wires is broken as compared with the periodic structure of the lattice. Further, for example, in the conductive film described in Patent Literature 2, the electrode lines have partially different line widths, so that the periodicity of the periodic structure of the electrode lines is broken as compared with the case where the line width is constant. I have. Further, for example, in the conductive film described in Patent Literature 3, the periodicity of the periodic structure of the electrode lines is broken because the contours of the electrode lines have random irregularities.

International Publication No. WO 2014/115831 JP 2009-252868 A JP 2010-276998 A

  The lower the periodicity of the pattern in which the plurality of first electrode lines and the plurality of second electrode lines are superimposed, the more difficult it becomes to recognize this electrode line pattern as a periodic structure. Becomes difficult to recognize as a shift between the two periodic structures. Therefore, as the periodicity of the electrode line pattern is lower, the visibility of moire is suppressed.

  On the other hand, if the periodicity of the electrode line pattern is low, unevenness such as brightness occurs in an area where the electrode line pattern is located, and when viewed from the operation surface, flickering and screen glare distributed in a sandy manner are felt. In some cases, a phenomenon called graining may occur. If the periodicity of the electrode wire pattern is low, the density of the electrode wires in the pattern is biased, and thus such a difference in the density of the electrode wires is considered to be one of the causes of the formation of the grain.

  In other words, the lower the periodicity of the electrode line pattern, the more the moiré is suppressed, while the degree of the grain becomes stronger, and after all, the quality of the image visually recognized on the display device is deteriorated due to the appearance different from the moiré. I do.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a conductive film, a touch panel, and a display device that can achieve both suppression of moiré and suppression of grain.

  A conductive film that solves the above-mentioned problem has a first surface, a transparent dielectric layer having a second surface opposite to the first surface, and a transparent dielectric layer on the first surface of the transparent dielectric layer. A first electrode line group consisting of a plurality of electrode lines extending along a first direction and arranged in a first intersecting direction intersecting with the first direction; and a second electrode line group of the transparent dielectric layer. A second electrode line group including a plurality of electrode lines extending along a second direction intersecting with the first direction and arranged along a second intersecting direction intersecting with the second direction; Wherein each of the first electrode line group and the second electrode line group is a target electrode line group, and the first direction with respect to the first electrode line group and the second direction with respect to the second electrode line group. Each is a reference direction, the first intersecting direction with respect to the first electrode line group, and Each of the second intersecting directions with respect to the second electrode line group is a reference intersecting direction, and the target electrode line group is a plurality of reference electrode lines that are virtual electrode lines having a bent line shape extending in the reference direction. Wherein the first virtual bent portion and the second virtual bent portion are alternately arranged one by one periodically along the reference electrode line, and a plurality of the first virtual bent portions and a plurality of the second virtual bent portions are arranged. The virtual bending portion is located on a separate straight line extending in the reference direction, and the first virtual line is formed by a plurality of the reference electrode lines arranged at a reference interval that is a predetermined interval in the reference cross direction. The reference bent portion, which is each of the bent portion and the second virtual bent portion, includes a plurality of the electrode lines having bent line shapes that are irregularly displaced with respect to the order of arrangement of the reference bent portions in each reference electrode line. In the reference electrode line, the reference direction The distance between two adjacent reference bends is a reference cycle, and has a length of 0.25 times or less of the reference cycle around the reference bend before the displacement, and extends in the reference direction. A diamond-shaped virtual region having an extended diagonal line and a diagonal line having a length of 0.5 times or less the reference interval and extending in the reference cross direction is a displacement region, and the reference bent portion after the displacement is provided. Are located within the displacement region.

  According to the above configuration, the electrode lines included in each of the first electrode line group and the second electrode line group have a bent line shape that bends irregularly. Therefore, compared to the electrode line pattern composed of the electrode lines having a regular bent line shape, the spatial periodicity of the electrode line pattern is low, and regarding the suppression of moiré, the period of the pixel pattern of the display panel is small. The effect on sex is kept low. Therefore, when a touch panel using a conductive film having such an electrode line pattern is superimposed on a display panel, it is possible to suppress the occurrence of moire. On the other hand, the electrode wires constituting the electrode wire pattern having the above configuration have a bent line shape in which the reference bent portion of the reference electrode line having the regular bent line shape is irregularly displaced, and the displacement of the reference bent portion is By setting the size of the displacement region, which is the range, within the above range, excessive irregularity of the electrode line pattern can be suppressed to such an extent that the occurrence of grain is suppressed. Therefore, by using the conductive film having the electrode line pattern having the above configuration, it is possible to achieve both the suppression of moire and the suppression of grain.

  In the above-described configuration, each of the plurality of electrode lines constituting the target electrode line group is a set of a plurality of short line portions having a linear shape connecting adjacent bent portions along each electrode line, and the plurality of short lines are provided. In the portion, the length of the short line portion and the inclination of the short line portion with respect to the reference direction may change irregularly in the order in which the short line portions are arranged in each electrode wire.

According to the above configuration, an electrode wire having a bent line shape that bends irregularly is accurately realized.
In the above configuration, each of the plurality of electrode wires constituting the target electrode wire group has a plurality of first bent portions and a plurality of second bent portions, and the first bent portion, the second bent portion, and the like. Have a bent line shape alternately arranged one by one along the electrode lines, and in a power spectrum obtained by a two-dimensional Fourier transform of a plurality of electrode lines constituting the target electrode line group, 4 Four directions that are line-symmetric with respect to each of two coordinate axes orthogonal to each other at the origin are the periodic directions, and the electrode lines forming the target electrode line group include the electrode lines. , The angle of the electrode wire at the second bent portion, the distance between the adjacent first bent portions, the distance between the adjacent second bent portions, the cycle of these Derived from sex That such peaks are distributed in a band shape along each periodic direction, a plurality of electrode lines constituting the target electrode line group may be configured.

According to the above configuration, since the periodicity of the electrode line pattern is suppressed to a low level, it is possible to accurately suppress moiré from being visually recognized when overlapping with the display panel.
In the power spectrum having the above-described configuration, the peak distributed in the band shape includes a peak stronger than a peak derived from the periodicity only in the reference cross direction in a plurality of electrode lines included in the target electrode line group, A plurality of electrode lines constituting the target electrode line group may be configured.

  According to the above configuration, the periodicity in the reference cross direction in each target electrode line group is suppressed to be low in the electrode line pattern, and therefore, when superimposed on the display panel, the visibility of moire is accurately suppressed. .

  A touch panel that solves the above-mentioned problem includes a conductive film having the above configuration, a cover layer that covers the conductive film, and an electrode line disposed on the first surface and an electrode line disposed on the second surface. And a peripheral circuit for measuring the capacitance.

According to the above configuration, it is possible to suppress both moiré and grain at the time of superposition with the display panel.
A display device that solves the above problem has a display panel that has a plurality of pixels arranged in a lattice and displays information, a touch panel that transmits the information displayed by the display panel, and controls driving of the touch panel. A touch panel having the above configuration.

  According to the above configuration, the display device can achieve both the suppression of moiré and the suppression of grain, so that a decrease in display quality is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, suppression of a moire and suppression of a grain can be compatible.

FIG. 2 is a cross-sectional view illustrating a cross-sectional structure in one embodiment of a display device. FIG. 2 is a plan view showing a planar structure of a conductive film according to one embodiment. FIG. 2 is a plan view showing a pixel array of the display panel according to the embodiment. FIG. 2 is a schematic diagram illustrating an electrical configuration of a touch panel according to one embodiment. The figure which shows the structure of the sensing electrode wire in one Embodiment. FIG. 2 is a diagram illustrating a configuration of a drive electrode line according to the embodiment. FIG. 2 is a plan view showing a planar structure of a part of the conductive film according to one embodiment, showing a configuration of an electrode line pattern including a sensing electrode line and a drive electrode line. The figure which shows the structure of the sensing reference electrode wire in one Embodiment. FIG. 9 is a diagram illustrating an example of an FFT analysis result of a pattern including a plurality of sensing reference electrode lines according to the embodiment. The figure which shows the relationship between the occupation ratio and the intensity of the frequency component in a FFT analysis result about the sensing reference electrode line in one Embodiment. The figure which shows the displacement area | region of the reference | standard bending part in the sensing reference electrode wire of one Embodiment. The figure which shows an example of the sensing electrode wire created by the displacement of the reference | standard bending part in the sensing reference electrode wire of one Embodiment. FIG. 4 is a diagram illustrating an example of a drive electrode line created by displacement of a reference bent portion in the drive reference electrode line according to the embodiment. FIG. 9 is a diagram illustrating an example of an FFT analysis result of a pattern including a plurality of sensing reference electrode lines according to the embodiment. The figure which shows an example of the FFT analysis result of the pattern of the electrode line created based on the sensing reference electrode line of one Embodiment. The figure which shows an example of the FFT analysis result of the pattern of the electrode line created based on the sensing reference electrode line of one Embodiment. The figure which shows an example of the FFT analysis result of the pattern of the electrode line created based on the sensing reference electrode line of one Embodiment. The figure which showed the relationship between the magnitude | size of the displacement area | region of the reference | standard bending part of the sensing reference electrode wire in one embodiment, and the intensity | strength of the fundamental spatial frequency component in the FFT analysis result of the sensing electrode wire. The figure which shows an example of the FFT analysis result of the electrode line pattern comprised from the sensing electrode line and drive electrode line of one Embodiment. Sectional drawing which shows the cross-section of the display device in a modification. Sectional drawing which shows the cross-section of the display device in a modification.

  One embodiment of a conductive film, a touch panel, and a display device will be described with reference to FIGS. In addition, each drawing is a diagram schematically showing the configuration of the conductive film, the touch panel, and the display device according to the present embodiment, and the size of each part of the configuration shown in each drawing is shown. The ratio may be different from the actual ratio.

[Configuration of Display Device]
The configuration of the display device will be described with reference to FIG.
As shown in FIG. 1, the display device 100 includes, for example, a laminated body in which a display panel 10 that is a liquid crystal panel and a touch panel 20 are bonded by one transparent adhesive layer (not shown), and further drives the touch panel 20. And a control unit that controls the driving of the touch panel 20. The transparent adhesive layer may be omitted as long as the relative position between the display panel 10 and the touch panel 20 is fixed by another configuration such as a housing.

A substantially rectangular display surface is defined on the surface of the display panel 10, and information such as an image based on image data is displayed on the display surface.
The components constituting the display panel 10 are arranged as follows in order from the component far from the touch panel 20. That is, the lower polarizing plate 11, the thin film transistor (hereinafter, TFT) substrate 12, the TFT layer 13, the liquid crystal layer 14, the color filter layer 15, the color filter substrate 16, and the upper polarizing plate 17 are located in the order far from the touch panel 20. I have.

  Among them, pixel electrodes constituting sub-pixels are arranged in a matrix on the TFT layer 13. The black matrix included in the color filter layer 15 has a lattice shape including a plurality of unit cells having a rectangular shape. The black matrix partitions a plurality of regions having a rectangular shape facing each of the sub-pixels by such a lattice shape, and each region partitioned by the black matrix emits white light in any of red, green, and blue. There is a colored layer that changes the light to that color.

  Note that the display panel 10 is an EL panel that outputs colored light, and has a configuration including a red pixel that outputs red light, a green pixel that outputs green light, and a blue pixel that outputs blue light. If so, the color filter layer 15 described above may be omitted. At this time, the boundary between pixels adjacent to each other in the EL panel functions as a black matrix. In addition, the display panel 10 may be a plasma panel that emits light by discharge. In this case, a boundary portion that partitions the red phosphor layer, the green phosphor layer, and the blue phosphor layer is a black matrix. Function.

  The touch panel 20 is a capacitive touch panel, and is a laminate in which a conductive film 21 and a cover layer 22 are bonded to each other by a transparent adhesive layer 23, and has a light transmissivity for transmitting information displayed on the display panel 10. have.

  More specifically, the transparent substrate 31, the plurality of drive electrodes 31DP, the transparent adhesive layer 32, the transparent dielectric substrate 33, and the plurality of sensing electrodes are arranged in order from the components constituting the touch panel 20 close to the display panel 10. 33SP, the transparent adhesive layer 23, and the cover layer 22 are located. Among these, the transparent substrate 31, the drive electrode 31DP, the transparent adhesive layer 32, the transparent dielectric substrate 33, and the sensing electrode 33SP constitute the conductive film 21.

  The transparent substrate 31 has a light-transmitting property and an insulating property for transmitting information such as an image displayed on the display surface of the display panel 10 and is overlaid on the entire display surface. The transparent substrate 31 is made of, for example, a transparent glass substrate, a transparent resin film, or a substrate such as a silicon substrate. Examples of the resin used for the transparent substrate 31 include PET (Polyethylene Terephthalate), PMMA (Polymethyl methacrylate), PP (Polypropylene), PS (Polystyrene), and the like. The transparent substrate 31 may be a single-layer structure composed of one substrate, or may be a multilayer structure in which two or more substrates are stacked.

  The surface of the transparent substrate 31 opposite to the display panel 10 is set as a drive electrode surface 31S, and a plurality of drive electrodes 31DP are arranged on the drive electrode surface 31S. The plurality of drive electrodes 31DP and portions where the drive electrodes 31DP are not located on the drive electrode surface 31S are bonded to the transparent dielectric substrate 33 by one transparent adhesive layer 32.

  The transparent adhesive layer 32 has a light-transmitting property for transmitting information such as an image displayed on the display surface. For the transparent adhesive layer 32, for example, a polyether adhesive or an acrylic adhesive is used.

  The transparent dielectric substrate 33 has a light transmittance for transmitting information such as an image displayed on the display surface, and a relative permittivity suitable for detecting capacitance between electrodes. The transparent dielectric substrate 33 is made of, for example, a transparent glass substrate, a transparent resin film, or a substrate such as a silicon substrate. Examples of the resin used for the transparent dielectric substrate 33 include PET, PMMA, PP, and PS. The transparent dielectric substrate 33 may be a single-layer structure composed of one base material or a multilayer structure in which two or more base materials are stacked.

  As a result of the plurality of drive electrodes 31DP being bonded to the transparent dielectric substrate 33 by the transparent adhesive layer 32, the plurality of drive electrodes 31DP are arranged on the back surface of the transparent dielectric substrate 33 that faces the transparent substrate 31.

  The surface of the transparent dielectric substrate 33 opposite to the transparent adhesive layer 32 is set as a sensing electrode surface 33S, and a plurality of sensing electrodes 33SP are arranged on the sensing electrode surface 33S. That is, the transparent dielectric substrate 33 is sandwiched between the plurality of drive electrodes 31DP and the plurality of sensing electrodes 33SP. The plurality of sensing electrodes 33SP and portions where the sensing electrodes 33SP are not located on the sensing electrode surface 33S are bonded to the cover layer 22 by one transparent adhesive layer 23.

  The transparent adhesive layer 23 has a light-transmitting property for transmitting information such as an image displayed on the display surface. For the transparent adhesive layer 23, for example, a polyether adhesive or an acrylic adhesive is used. The kind of the adhesive used as the transparent adhesive layer 23 may be a wet laminating adhesive, a dry laminating adhesive or a hot laminating adhesive.

  The cover layer 22 is formed from a glass substrate such as tempered glass, a resin film, or the like, and a surface of the cover layer 22 opposite to the transparent adhesive layer 23 is a surface of the touch panel 20 and functions as an operation surface 20S.

  In addition, among the above components, the transparent adhesive layer 23 may be omitted. In the configuration in which the transparent adhesive layer 23 is omitted, the surface facing the transparent dielectric substrate 33 among the surfaces of the cover layer 22 is set as the sensing electrode surface 33S, and one thin film formed on the sensing electrode surface 33S is formed. A plurality of sensing electrodes 33SP may be formed by patterning.

  When manufacturing the touch panel 20, a method in which the conductive film 21 and the cover layer 22 are bonded together with the transparent adhesive layer 23 may be adopted. As another example different from such a manufacturing method, the following method is used. A manufacturing method may be adopted. That is, a thin film layer made of a conductive metal such as copper is formed directly on the cover layer 22 such as a resin film or via an underlayer, and the pattern shape of the sensing electrode 33SP is formed on the thin film layer. The formed resist layer is formed. Next, the thin film layer is processed into a plurality of sensing electrodes 33SP by a wet etching method using ferric chloride or the like, and a first film is obtained. Similarly to the sensing electrode 33SP, a thin film layer formed on another resin film functioning as the transparent substrate 31 is processed into a plurality of drive electrodes 31DP to obtain a second film. Then, the first film and the second film are attached to the transparent dielectric substrate 33 by the transparent adhesive layers 23 and 32 so as to sandwich the transparent dielectric substrate 33 therebetween.

[Plane structure of conductive film]
With reference to FIG. 2, the planar structure of the conductive film 21 will be described focusing on the positional relationship between the sensing electrode 33SP and the drive electrode 31DP. FIG. 2 is a view of the conductive film 21 as viewed from a direction facing the surface of the transparent dielectric substrate 33. Each of the strip-shaped regions extending along the horizontal direction surrounded by a two-dot chain line is one. The area where the sensing electrode 33SP is arranged is shown, and each of the strip-shaped areas surrounded by the two-dot chain line extending in the vertical direction is an area where one drive electrode 31DP is arranged. Note that the numbers of the sensing electrodes 33SP and the drive electrodes 31DP are simplified.

  Further, in order to facilitate understanding of the configuration of the sensing electrode 33SP and the drive electrode 31DP, only the sensing electrode 33SP located at the uppermost position in FIG. In FIG. 2, only the drive electrode 31DP located on the leftmost side shows the drive electrode lines constituting the drive electrode 31DP by thin lines. In FIG. 2, the shape of the sensing electrode wire and the shape of the drive electrode wire are schematically shown.

  As shown in FIG. 2, on the sensing electrode surface 33S of the transparent dielectric substrate 33, each of the plurality of sensing electrodes 33SP has a band shape extending along the first electrode direction D1, which is one direction, and They are arranged along a second electrode direction D2 orthogonal to the first electrode direction D1. Each sensing electrode 33SP is mutually insulated from another adjacent sensing electrode 33SP.

  Each sensing electrode 33SP includes a plurality of sensing electrode lines 33SR, and a sensing electrode line group 33SG, which is a set of all of the plurality of sensing electrode lines 33SR, is arranged on the sensing electrode surface 33S. A metal film such as copper, silver, or aluminum is used as a material for forming the sensing electrode line 33SR. The sensing electrode line 33SR is formed by, for example, patterning a metal film formed on the sensing electrode surface 33S by etching. It is formed. Each of the plurality of sensing electrodes 33SP is individually connected to a detection circuit which is an example of a peripheral circuit of the touch panel 20 via a sensing pad 33P, and a current value is measured by the detection circuit.

  On the drive electrode surface 31S of the transparent substrate 31, each of the plurality of drive electrodes 31DP has a band shape extending along the second electrode direction D2, and is arranged along the first electrode direction D1. Each drive electrode 31DP is insulated from another adjacent drive electrode 31DP.

  Each drive electrode 31DP includes a plurality of drive electrode lines 31DR, and a drive electrode line group 31DG, which is a set of all of the plurality of drive electrode lines 31DR, is arranged on the drive electrode surface 31S. A metal film such as copper, silver, or aluminum is used as a material for forming the drive electrode line 31DR. The drive electrode line 31DR is formed by, for example, patterning a metal film formed on the drive electrode surface 31S by etching. It is formed. Each of the plurality of drive electrodes 31DP is individually connected to a selection circuit, which is an example of a peripheral circuit of the touch panel 20, via a drive pad 31P, and is selected by the selection circuit by receiving a drive signal output from the selection circuit.

  In a plan view facing the surface of the transparent dielectric substrate 33, a portion where the sensing electrode 33SP and the drive electrode 31DP overlap each other is a capacitance detecting unit ND having a square shape defined by a two-dot chain line in FIG. . One capacitance detection section ND is a portion where one sensing electrode 33SP and one drive electrode 31DP three-dimensionally intersect, and detects a position on the touch panel 20 where a user's finger or the like touches. The smallest possible unit.

The method of forming the sensing electrode lines 33SR and the drive electrode lines 31DR is not limited to the above-described etching, and other methods such as a printing method may be used.
[Planar structure of display panel]
The planar structure of the color filter layer 15 in the display panel 10, that is, the pixel arrangement of the display panel 10 will be described with reference to FIG.

  As shown in FIG. 3, the black matrix 15a of the color filter layer 15 has a grid pattern composed of a plurality of unit grids having a rectangular shape arranged along the first electrode direction D1 and the second electrode direction D2. have. One pixel 15P is composed of three unit lattices that are continuous along the first electrode direction D1, and a plurality of pixels 15P are arranged in a grid along the first electrode direction D1 and the second electrode direction D2. In.

  Each of the pixels 15P includes a red coloring layer 15R for displaying red, a green coloring layer 15G for displaying green, and a blue coloring layer 15B for displaying blue. In the color filter layer 15, for example, a plurality of red coloring layers 15R, a plurality of green coloring layers 15G, and a plurality of blue coloring layers 15B are repeatedly arranged in this order along the first electrode direction D1. Further, the plurality of red coloring layers 15R are continuously arranged along the second electrode direction D2, the plurality of green coloring layers 15G are continuously arranged along the second electrode direction D2, and the plurality of blue coloring layers 15B. Are continuously arranged along the second electrode direction D2.

  One red coloring layer 15R, one green coloring layer 15G, and one blue coloring layer 15B constitute one pixel 15P, and the plurality of pixels 15P are formed of a red coloring layer 15R in the first electrode direction D1, a green color. The coloring layers 15G and the blue coloring layers 15B are arranged along the first electrode direction D1 while maintaining the order of arrangement. In other words, the plurality of pixels 15P are arranged in a stripe shape extending along the second electrode direction D2.

  The width of the pixel 15P along the first electrode direction D1 is the first pixel width P1, and the width of the pixel 15P along the second electrode direction D2 is the second pixel width P2. Each of the first pixel width P1 and the second pixel width P2 is set to a value according to the size of the display panel 10, the resolution required for the display panel 10, and the like.

[Electrical configuration of touch panel]
With reference to FIG. 4, an electrical configuration of the touch panel 20 will be described together with functions of a control unit included in the display device 100. In the following, an electrical configuration of the mutual capacitance type touch panel 20 will be described as an example of the capacitance type touch panel 20.

  As shown in FIG. 4, the touch panel 20 includes a selection circuit 34 and a detection circuit 35 as peripheral circuits. The selection circuit 34 is connected to the plurality of drive electrodes 31DP, the detection circuit 35 is connected to the plurality of sensing electrodes 33SP, and the control unit 36 included in the display device 100 is connected to the selection circuit 34 and the detection circuit 35. I have.

  The control unit 36 generates and outputs a start timing signal for causing the selection circuit 34 to start generating a drive signal for each drive electrode 31DP. The control unit 36 generates and outputs a scan timing signal for causing the selection circuit 34 to sequentially scan the target to which the drive signal is supplied from the first drive electrode 31DP1 to the nth drive electrode 31DPn.

  The control unit 36 generates and outputs a start timing signal for causing the detection circuit 35 to start detecting the current flowing through each sensing electrode 33SP. The control unit 36 generates and outputs a scan timing signal for causing the detection circuit 35 to sequentially scan the detection target from the first sensing electrode 33SP1 to the nth sensing electrode 33SPn.

  The selection circuit 34 starts generating the drive signal based on the start timing signal output from the control unit 36, and switches the output destination of the drive signal to the first drive electrode based on the scan timing signal output from the control unit 36. Scanning is performed from 31DP1 toward the n-th drive electrode 31DPn.

  The detection circuit 35 includes a signal acquisition unit 35a and a signal processing unit 35b. The signal acquisition unit 35a starts acquiring a current signal that is an analog signal generated at each sensing electrode 33SP based on the start timing signal output from the control unit 36. Then, the signal acquisition unit 35a scans the acquisition source of the current signal from the first sensing electrode 33SP1 to the nth sensing electrode 33SPn based on the scanning timing signal output from the control unit 36.

  The signal processing unit 35b processes each current signal acquired by the signal acquisition unit 35a, generates a voltage signal that is a digital value, and outputs the generated voltage signal to the control unit 36. As described above, the selection circuit 34 and the detection circuit 35 generate the voltage signal from the current signal that changes in accordance with the change in the capacitance, thereby changing the change in the capacitance between the drive electrode 31DP and the sensing electrode 33SP. Is measured.

  The control unit 36 detects a position on the touch panel 20 touched by a user's finger or the like based on the voltage signal output from the signal processing unit 35b, and displays information on the detected position on the display surface of the display panel. Used for various processes such as generation of information. The touch panel 20 is not limited to the mutual capacitance type touch panel 20 described above, and may be a self-capacity type touch panel.

[Structure of sensing electrode wire group]
The configuration of the sensing electrode line group 33SG will be described with reference to FIG.
As shown in FIG. 5, each of the plurality of sensing electrode lines 33SR has a bent line shape including a plurality of bent portions 33Q. In the plurality of bent portions 33Q, a bent portion 33Q corresponding to a mountain portion in the drawing is an example of a first bent portion, and a bent portion 33Q corresponding to a valley portion in the drawing is an example of a second bent portion. The bent portions 33Q corresponding to the mountain portions in the drawing and the bent portions 33Q corresponding to the valley portions in the drawing are alternately arranged one by one along the sensing electrode line 33SR.

  The plurality of sensing electrode lines 33SR are arranged at intervals along the second electrode direction D2. It is preferable that the sensing electrode lines 33SR adjacent to each other do not cross or contact with each other. Each of the plurality of sensing electrode lines 33SR forming one sensing electrode 33SP is connected to the sensing pad 33P at one end in the first electrode direction D1.

  In detail, each of the plurality of sensing electrode lines 33SR is a set of short line portions 33E having a linear shape connecting the bent portions 33Q adjacent to each other along the sensing electrode line 33SR. It includes a plurality of short lines 33E arranged along the first electrode direction D1, and a bent portion 33Q that is a portion where two adjacent short lines 33E are connected. In other words, each of the plurality of sensing electrode lines 33SR has a polygonal line shape in which the plurality of short line portions 33E are connected via the bent portion 33Q and extend along the first electrode direction D1.

  Each of the plurality of short lines 33E has a length L1 along the direction in which the short line 33E extends, and the plurality of short lines 33E include short lines 33E having different lengths L1. That is, in the plurality of short line portions 33E, the length L1 is not constant. Between the plurality of short lines 33E arranged in the first electrode direction D1, the length L1 is irregularly changed with respect to the order of arrangement of the short lines 33E.

  Each of the plurality of short lines 33E has an inclination θ1 with respect to a base axis A1, which is a virtual straight line extending along the first electrode direction D1, and the plurality of short lines 33E have inclinations θ1 different from each other. A short line portion 33E is included. That is, the inclination θ1 is not constant in the plurality of short line portions 33E. The inclination θ1 is an angle other than 0 degrees, and one inclination θ1 of the two short lines 33E adjacent to each other is positive, and the other inclination θ1 is negative. In other words, in one sensing electrode line 33SR, a short line portion 33E having a positive inclination θ1 and a short line portion 33E having a negative inclination θ1 are alternately repeated along the first electrode direction D1. . The absolute value of the inclination θ1 changes irregularly between the plurality of short lines 33E arranged in the first electrode direction D1 with respect to the order of arrangement of the short lines 33E.

  All of the plurality of short lines 33E constituting one sensing electrode line 33SR intersect or contact one base axis A1. In other words, for each sensing electrode line 33SR, a base axis A1, which is a single virtual straight line that intersects or contacts all of the plurality of short lines 33E constituting each sensing electrode line 33SR, can be arranged. Further, a plurality of sensing electrode lines 33SR are configured such that these base axes A1 are arranged at predetermined intervals in the second electrode direction D2.

  When the number of bent portions 33Q of one sensing electrode line 33SR is the number of bent portions, the variation in the number of bent portions among the plurality of sensing electrode lines 33SR, that is, the variation in the number of bent portions in the sensing electrode line group 33SG is 5%. The following is preferred. For all the sensing electrode lines 33SR included in the sensing electrode line group 33SG, the arithmetic average value of the number of bent portions for each sensing electrode line 33SR is set to an average value Asave. For all the sensing electrode lines 33SR included in the sensing electrode line group 33SG, the maximum value of the number of bent portions for each sensing electrode line 33SR is set to the maximum value Asmax. For all the sensing electrode lines 33SR included in the sensing electrode line group 33SG, the minimum value of the number of bent portions for each sensing electrode line 33SR is set to the minimum value Asmin. At this time, the variation in the number of bent portions is given by (Asmax + Asmin) / (2 × Asave) × 100.

  Specifically, the number of bent portions of each sensing electrode line 33SR is preferably equal, and even if the number of bent portions varies among the plurality of sensing electrode lines 33SR, the number of bent portions of each sensing electrode line 33SR is smaller. The difference is preferably two or less. The reason why the difference in the number of bent portions is two or less is that the difference between the plurality of sensing electrode lines 33SR depends on whether or not the bent portion 33Q is arranged at each of two ends of each sensing electrode line 33SR. This may cause variations in the number of bent portions.

  If the variation in the number of bent portions in the sensing electrode wire group 33SG is within the above range, it is possible to suppress the occurrence of bias in the density of the electrode wires in the pattern configured of the plurality of sensing electrode wires 33SR, and to be adjacent to each other. Intersecting or contacting of the sensing electrode lines 33SR is suppressed. When the sensing electrode lines 33SR adjacent to each other intersect or come into contact with each other, the short lines 33E of the sensing electrode lines 33SR intersect with each other to form a corner at the intersection or the contact portion. When the sensing electrode line 33SR is formed by etching, the electrode line is thickened at the corner, and the corner is easily recognized. Therefore, it is preferable that the number of corner portions is small, and for that purpose, it is preferable that the number of the intersections and the contact portions is small.

  In one sensing electrode line 33SR, a virtual line segment connecting a plurality of bent portions 33Q arranged along the bent line every other straight line is referred to as a virtual line segment A3, and a set of the virtual line segments A3 is referred to as a virtual line A2. And In other words, the imaginary line segment A3 is a line segment connecting the adjacent peaks or the adjacent valleys in the bent line in a straight line. A plurality of virtual line segments A3 extending along the first electrode direction D1 form a virtual line A2.

  The plurality of virtual line segments A3 include virtual line segments A3 having different inclinations with respect to the base axis A1. That is, in the plurality of virtual line segments A3, the inclination with respect to the base axis A1 is not constant. Then, in one virtual line A2, the inclination of each of the plurality of virtual line segments A3 with respect to the base axis A1 changes irregularly in the order of arrangement of the virtual line segments A3. The plurality of virtual line segments A3 may include a virtual line segment A3 whose inclination with respect to the base axis A1 is 0 degree.

[Configuration of Drive Electrode Line Group]
With reference to FIG. 6, the configuration of drive electrode line group 31DG will be described.
As shown in FIG. 6, each of the plurality of drive electrode lines 31DR has a bent line shape including a plurality of bent portions 31Q, and the plurality of drive electrode lines 31DR are spaced apart along the first electrode direction D1. Are arranged. It is preferable that the drive electrode lines 31DR adjacent to each other do not cross or contact with each other. Each of the plurality of drive electrode lines 31DR forming one drive electrode 31DP is connected to the drive pad 31P at one end in the second electrode direction D2.

  Specifically, each of the plurality of drive electrode lines 31DR is a set of linear short portions 31E connecting the bent portions 31Q adjacent to each other along the drive electrode line 31DR, and each drive electrode line 31DR is It includes a plurality of short line portions 31E arranged in the second electrode direction D2 and a bent portion 31Q which is a portion where two adjacent short line portions 31E are connected. The plurality of bent portions 31Q include a first bent portion and a second bent portion, and the first bent portion and the second bent portion are alternately arranged one by one along the drive electrode line 31DR.

  Each of the plurality of short lines 31E has a length L2 along the direction in which the short lines 31E extend. Between the plurality of short lines 31E arranged in the second electrode direction D2, the length L2 is irregularly changed in the order of arrangement of the short lines 31E.

  Each of the plurality of short lines 31E has an inclination θ2 with respect to a base axis B1, which is a virtual straight line extending along the second electrode direction D2. The inclination θ2 is an angle other than 0 degrees, and in one drive electrode line 31DR, a short line portion 31E having a positive inclination θ2 and a short line portion 31E having a negative inclination θ2 in the second electrode direction D2. Are alternately repeated along. The absolute value of the inclination θ2 is irregularly changed between the plurality of short lines 31E arranged along the second electrode direction D2 with respect to the order of arrangement of the short lines 31E.

  All of the plurality of short line portions 31E constituting one drive electrode line 31DR intersect or contact one base axis B1. In other words, for each drive electrode line 31DR, a base axis B1 that is one virtual straight line that intersects or contacts all of the plurality of short lines 31E configuring each drive electrode line 31DR can be arranged. Further, a plurality of drive electrode lines 31DR are configured such that these base axes B1 are arranged at predetermined intervals in the first electrode direction D1.

  When the number of bent portions 31Q included in one drive electrode line 31DR is defined as the number of bent portions, the variation in the number of bent portions among the plurality of drive electrode lines 31DR, that is, the variation in the number of bent portions in the drive electrode line group 31DG is 5%. The following is preferred. For all the drive electrode lines 31DR included in the drive electrode line group 31DG, the arithmetic average value of the number of bends for each drive electrode line 31DR is set as an average value Adave. For all the drive electrode lines 31DR included in the drive electrode line group 31DG, the maximum value of the number of bent portions for each drive electrode line 31DR is set to the maximum value Admax. For all the drive electrode lines 31DR included in the drive electrode line group 31DG, the minimum value of the number of bent portions for each drive electrode line 31DR is set to the minimum value Admin. At this time, the variation in the number of bent portions is given by (Admax + Admin) / (2 × Adave) × 100.

  Specifically, the number of bends of each drive electrode line 31DR is preferably equal, and even if the number of bends varies among the plurality of drive electrode lines 31DR, the number of bends in each drive electrode line 31DR is reduced. The difference is preferably two or less. If the variation in the number of bent portions in the drive electrode line group 31DG is within the above range, it is possible to prevent the density of the electrode lines from being biased in the pattern composed of the plurality of drive electrode lines 31DR, and to be adjacent to each other. The intersection and contact of the drive electrode lines 31DR are suppressed.

  In one drive electrode line 31DR, a virtual line segment that connects a plurality of bent portions 31Q arranged along the bent line every other straight line is referred to as a virtual line segment B3, and a set of the virtual line segments B3 is referred to as a virtual line B2. And In one virtual line B2, the inclination of each of the plurality of virtual line segments B3 with respect to the base axis B1 changes irregularly in the order of arrangement of the virtual line segments B3. The plurality of virtual line segments B3 may include a virtual line segment B3 whose inclination with respect to the base axis B1 is 0 degrees.

[Detailed structure of conductive film]
Referring to FIG. 7, an electrode line pattern which is a pattern formed by overlapping sensing electrode line group 33SG and drive electrode line group 31DG will be described.

  As shown in FIG. 7, in the conductive film 21, when viewed from the direction facing the surface of the transparent dielectric substrate 33, the pattern formed by the above-described plurality of sensing electrode lines 33 SR and the plurality of drive electrode lines 31 DR A pattern is formed in which the configured pattern is superimposed. At this time, these electrode lines are overlapped so that the sensing electrode 33SP and the drive electrode 31DP are orthogonal to each other, that is, the direction in which the sensing electrode line 33SR extends is orthogonal to the direction in which the drive electrode line 31DR extends. .

[Method of creating electrode wire pattern]
With reference to FIG. 8 to FIG. 13, a description will be given of a method of creating a pattern including the plurality of sensing electrode lines 33SR and a pattern including the plurality of drive electrode lines 31DR. First, a method of forming a pattern including the sensing electrode lines 33SR will be described.

  The pattern of the sensing electrode lines 33SR of the present embodiment is created based on a pattern composed of a plurality of reference electrode lines having a periodic polygonal line shape. First, a pattern composed of reference electrode lines will be described with reference to FIG.

  As shown in FIG. 8, each of the plurality of sensing reference electrode lines 40KR is a set of two types of reference short line portions 40E having a linear shape and mutually different inclinations, and extends along the first electrode direction D1. It includes two types of reference short line portions 40E that are alternately repeated, and a reference bent portion 40Q that is a portion where the two types of reference short line portions 40E are connected. In other words, each of the plurality of sensing reference electrode lines 40KR has a polygonal line shape in which the plurality of short reference line portions 40E are connected via the reference bent portion 40Q and extends along the first electrode direction D1.

  Each of the two types of reference short line portions 40E has a length Lk along the direction in which the reference short line portion 40E extends. The lengths Lk of the plurality of reference short line portions 40E are all equal. Of the two types of reference short line portions 40E, one reference short line portion 40Ea has an inclination of an angle + θk with respect to a base axis A1 which is a straight line extending along the first electrode direction D1, and the other reference short line portion 40Eb. Has an inclination of -θk with respect to the base axis A1. The angle formed by the two adjacent reference short line portions 40E is the reference angle αs, and the reference angles αs of the sensing reference electrode lines 40KR are all equal. The reference angle αs is bisected by a straight line passing through the reference bent portion 40Q and extending in a direction along the second electrode direction D2.

  In other words, the plurality of reference bending portions 40Q include a mountain portion in the drawing as an example of a first virtual bending portion and a valley portion in the drawing as an example of the second virtual bending portion. The two virtual bends are arranged alternately one by one periodically along the sensing reference electrode line 40KR. The plurality of first virtual bent portions and the plurality of second virtual bent portions are located on different straight lines extending along the first electrode direction D1.

  The length between the reference bent portions 40Q adjacent to each other along the first electrode direction D1 is the reference cycle Ws. In other words, the reference period Ws is the length between two connected reference bent portions 40Q when the reference bent portions 40Q arranged along the bent line are connected with every other straight line in one sensing reference electrode line 40KR. Now, it is the length between the first virtual bent portions corresponding to the ridge portions adjacent to each other in the bending line, or the length between the second virtual bent portions corresponding to the valley portions adjacent to each other. . In the sensing reference electrode line 40KR, the reference cycle Ws is constant.

  The plurality of sensing reference electrode lines 40KR are arranged at a fixed reference interval Ps along the second electrode direction D2. That is, the reference interval Ps is the distance between the ends of the sensing reference electrode lines 40KR adjacent to each other in the second electrode direction D2.

  Each of the plurality of sensing reference electrode lines 40KR is formed in a shape in which one sensing reference electrode line 40KR is translated along the second electrode direction D2. In the plurality of sensing reference electrode lines 40KR, the reference bent portion 40Q They are arranged on a straight line extending along the second electrode direction D2.

  The width occupied by one sensing reference electrode line 40KR in the second electrode direction D2, that is, the length of one reference short line portion 40E along the second electrode direction D2 is the reference width Hs. In the plurality of sensing reference electrode lines 40KR, the reference width Hs is constant.

  Each parameter of the reference angle αs, the reference cycle Ws, the reference interval Ps, and the reference width Hs is obtained by superimposing a pattern including a plurality of sensing reference electrode lines 40KR and a pixel pattern of the display panel 10 using Fourier analysis. Is preferably set to a value at which the occurrence of moire is suppressed. Specifically, the contrast of a moire generated when a pattern composed of a plurality of sensing reference electrode lines 40KR is superimposed on a pixel pattern of a predetermined period, and the pitch and angle of a fringe recognized as a moire are calculated. The value of each parameter is set so as to be difficult to perform. At this time, it is preferable that the value of each parameter that suppresses generation of moiré is commonly obtained for the pixel patterns of the plurality of display panels 10 having different sizes and different resolutions. The plurality of display panels 10 to be superimposed only need to include at least two types of display panels having different sizes or two types of display panels having different resolutions.

  In the Fourier analysis, a Fourier transform is performed on the pattern to be superimposed to obtain frequency information, a convolution of the obtained two-dimensional Fourier pattern is calculated, a two-dimensional mask is applied, and an inverse Fourier transform is applied. To perform image reconstruction. Since the pitch of the moiré is larger than the period of the original pattern to be superimposed, the two-dimensional mask only needs to remove high-frequency components and extract only low-frequency components by the two-dimensional mask. By setting the size of the mask to a size determined according to the human visual response characteristics, based on calculating the contrast, pitch, and angle of moiré after image reconstruction, whether or not moiré is visually recognized Can be determined.

  The reference interval Ps is preferably set in a range of 10% or more and 300% or less of the first pixel width P1 and the second pixel width P2 in the display panel 10. When the first pixel width P1 is different from the second pixel width P2, the larger one of the first pixel width P1 and the second pixel width P2 may be used as a reference.

  If the reference interval Ps is 10% or more of the first pixel width P1 and the second pixel width P2, the ratio of the electrode lines in the pattern does not become excessive, so that the light transmittance of the touch panel 20 is reduced. Can be suppressed. On the other hand, when the reference interval Ps is 300% or less of the first pixel width P1 and the second pixel width P2, the position detection accuracy on the touch panel is improved.

The reference width Hs is preferably set in a range where the occupation ratio Hs / Ps, which is the ratio of the reference width Hs to the reference interval Ps set as described above, is 0.7 or more and 1.3 or less.
The reason for defining the range of the occupancy ratio Hs / Ps will be described with reference to FIGS.

  FIG. 9 is a result of analyzing an example of a pattern including a plurality of sensing reference electrode lines 40KR illustrated in FIG. 8 by FFT (Fast Fourier Transformation), and includes a plurality of sensing reference electrode lines 40KR. 4 shows a power spectrum of a pattern by a two-dimensional Fourier transform. FIG. 9 highlights characteristic peaks, and omits weak points that are low in relation to the pattern of the sensing reference electrode line 40KR.

  The origin indicates the peak of the DC component, and basic spatial frequency components f1 and f2 defined by the reference angle αs and the reference period Ws, and higher-order components appear in the two-dimensional frequency space. In the figure, frequency components due to the reference period Ws appear on the left and right of the basic spatial frequency component f1 and on the left and right of the basic spatial frequency component f2.

  Here, a frequency component g which is a spatial frequency only in the v direction appears between the basic spatial frequency component f1 and the basic spatial frequency component f2. The frequency component g is a frequency component generated due to the reference interval Ps, and is derived from the periodicity only in the second electrode direction D2 included in the pattern of the sensing reference electrode line 40KR. The high intensity of the frequency component g indicates that the frequency component of the element extending in the first electrode direction D1 in the pattern of the sensing reference electrode line 40KR is large. In this case, the display panel 10 also extends in the first electrode direction D1. When the pixel pattern and the pattern of the sensing reference electrode line 40KR are overlapped with each other, these patterns interfere with each other and moire having high contrast is easily generated.

  FIG. 10 shows a result of analyzing how the intensity of the frequency component g in the FFT analysis result changes when the reference width Hs and the occupancy ratio Hs / Ps are changed. That is, the relationship between the degree of overlap between the region occupied by one sensing reference electrode line 40KR and the region occupied by another sensing reference electrode line 40KR and the intensity of the frequency component g along the first electrode direction D1 is shown. In FIG. 10, the vertical axis represents the logarithmic representation of the relative value obtained by dividing the intensity of the frequency component g by the intensity of the DC component of the entire pattern of the sensing reference electrode line 40KR, and the horizontal axis represents the occupancy ratio Hs / Ps. Show.

  As shown in FIG. 10, when increasing the occupancy ratio Hs / Ps from 0.4, if the occupancy ratio Hs / Ps exceeds 0.7, the intensity of the frequency component g sharply decreases, and the occupancy ratio Hs / Ps decreases. When Hs / Ps is 1.0, the intensity of the frequency component g becomes minimum. When the occupation ratio Hs / Ps exceeds 1.0, the intensity of the frequency component g increases. When the occupation ratio Hs / Ps exceeds 1.3, the intensity of the frequency component g becomes high and constant.

  Therefore, when the occupation ratio Hs / Ps is 0.7 or more and 1.3 or less, the intensity of the frequency component g is suppressed to be low. Therefore, when the pixel pattern and the pattern of the sensing reference electrode line 40KR are overlapped, moiré is generated. If the occupancy ratio Hs / Ps is 1.0, the intensity of the frequency component g becomes the lowest, which suggests that moiré is least likely to occur.

  The reference angle αs is preferably from 95 to 150 degrees, more preferably from 100 to 140 degrees. When the reference angle αs is equal to or more than 95 degrees, the number of the reference bent portions 40Q is increased and the ratio of the electrode lines occupied in the pattern is suppressed from being excessive, so that the decrease in the light transmittance of the touch panel 20 is suppressed. Can be On the other hand, if the reference angle αs is equal to or less than 150 degrees, the reference period Ws is maintained in a range that is not too large. Becomes When the reference angle αs is 90 degrees, the ratio between the reference cycle Ws and the reference width Hs is 2: 1. When the occupation ratio Hs / Ps is 1.0, the ratio between the reference cycle Ws and the reference interval Ps is not satisfied. The ratio becomes 2: 1. As a result, interference between the reference period Ws and the reference interval Ps becomes strong, which is not preferable.

  Subsequently, a method of creating a pattern composed of the plurality of sensing electrode lines 33SR based on the pattern composed of the plurality of sensing reference electrode lines 40KR will be described.

  The pattern composed of the sensing electrode line group 33SG, that is, the plurality of sensing electrode lines 33SR is created by irregularly displacing the position of the reference bent portion 40Q in the plurality of sensing reference electrode lines 40KR. The displacement region of the reference bent portion 40Q will be described in detail with reference to FIGS.

  As shown in FIG. 11, the position of the reference bent portion 40Q is moved within a rhombic displacement region Ss centered on the reference bent portion 40Q. One sensing electrode line 33SR is arranged such that the position of each reference bent portion 40Q in one sensing reference electrode line 40KR is irregular in the order of arrangement of the reference bent portions 40Q in the displacement region Ss for each reference bent portion 40Q. It has a moved shape.

  The displacement region Ss has a rhombus shape having a reference diagonal line Ns1 which is a diagonal line extending along the first electrode direction D1 and a cross direction diagonal line Ns2 which is a diagonal line extending along the second electrode direction D2. The length of the reference direction diagonal line Ns1 is the length ds1, and the length ds1 is set in a range of more than 0 times and 0.25 times or less of the reference period Ws. The length of the diagonal line Ns2 in the cross direction is the length ds2, and the length ds2 is set in a range of more than 0 times and 0.5 times or less of the reference interval Ps.

  FIG. 12 shows the sensing electrode lines 33SR obtained by irregularly displacing the positions of the reference bent portions 40Q in the plurality of sensing reference electrode lines 40KR within the displacement area Ss set for each of the reference bent portions 40Q. An example of a pattern is shown. In FIG. 12, the sensing reference electrode line 40KR is indicated by a thin line, and the sensing electrode line 33SR is indicated by a thick line.

  The reference bent portion 40Q after being moved in the displacement region Ss is the bent portion 33Q of the sensing electrode line 33SR, and the length and the inclination with respect to the first electrode direction D1 have been changed with the displacement of the reference bent portion 40Q. The later reference short line portion 40E is the short line portion 33E of the sensing electrode line 33SR. The positions of the reference bent portions 40Q in the plurality of sensing reference electrode lines 40KR are irregularly displaced with respect to the order in which the reference bent portions 40Q are arranged in the sensing reference electrode lines 40KR. A structured pattern is formed.

  As shown in FIG. 13, the pattern composed of the plurality of drive electrode lines 31DR is also similar to the pattern composed of the plurality of sensing electrode lines 33SR, in which the reference bend in the plurality of reference electrode lines having a periodic broken line shape is provided. Created by irregularly displacing parts.

  That is, the positions of the reference bent portions 41Q in the plurality of drive reference electrode lines 41KR are irregular in the order of arrangement of the reference bent portions 41Q in the drive reference electrode lines 41KR in the displacement area Sd for each reference bent portion 41Q. , A pattern composed of the plurality of drive electrode lines 31DR is formed. In FIG. 13, the drive reference electrode line 41KR is indicated by a thin line, and an example of the drive electrode line 31DR formed based on the drive reference electrode line 41KR is indicated by a thick line.

  The pattern constituted by the plurality of drive reference electrode lines 41KR is a pattern obtained by rotating the pattern constituted by the plurality of sensing reference electrode lines 40KR by 90 degrees. That is, the drive reference electrode line 41KR has a polygonal line shape in which a plurality of reference short line portions 41E are connected via the reference bent portion 41Q and extend along the second electrode direction D2. The reference bending portion 41Q includes a first virtual bending portion and a second virtual bending portion, and the plurality of first virtual bending portions and the plurality of second virtual bending portions are separately extended along the second electrode direction D2. The first virtual bent portion and the second virtual bent portion are alternately arranged one by one periodically along the drive reference electrode line 41KR.

  The angle between two adjacent reference short line portions 41E is the reference angle αd, the length between the adjacent reference bent portions 41Q along the second electrode direction D2 is the reference period Wd, and the first electrode The width occupied by one drive reference electrode line 41KR in the direction D1 is the reference width Hd. The plurality of drive reference electrode lines 41KR are arranged at a reference interval Pd along the first electrode direction D1. Each of the reference angle αd, the reference cycle Wd, the reference width Hd, and the reference interval Pd is based on the conditions described for the reference angle αs, the reference cycle Ws, the reference width Hs, and the reference interval Ps in the above description. It is preferable that the setting is made so as to satisfy the same condition.

  That is, the parameters of the reference angle αd, the reference cycle Wd, the reference width Hd, and the reference interval Pd are different from each other when the pattern including the plurality of drive reference electrode lines 41KR and the pixel pattern of the display panel 10 are overlapped. Is preferably set to a value that suppresses the occurrence of. The reference angle αd is preferably from 95 to 150 degrees, and more preferably from 100 to 140 degrees. Further, it is preferable that the reference interval Pd is set in a range of 10% or more and 300% or less of the first pixel width P1 and the second pixel width P2 in the display panel 10. Further, the reference width Hd is preferably set in a range where the ratio (Hd / Pd) of the reference width Hd to the reference interval Pd is 0.7 or more and 1.3 or less.

  The displacement region Sd has a rhombic shape having a reference diagonal line Nd1 which is a diagonal line extending along the second electrode direction D2 and a cross direction diagonal line Nd2 which is a diagonal line extending along the first electrode direction D1. The length of the diagonal line Nd1 in the reference direction is the length dd1, and the length dd1 is set in a range of more than 0 times and 0.25 times or less of the reference period Wd. The length of the cross direction diagonal line Nd2 is the length dd2, and the length dd2 is set in a range of more than 0 times and 0.5 times or less of the reference interval Pd.

  The reference bent portion 41Q after being moved in the displacement area Sd is the bent portion 31Q of the drive electrode line 31DR, and the length and the inclination with respect to the second electrode direction D2 are changed with the displacement of the reference bent portion 41Q. The later reference short line portion 41E is the short line portion 31E of the drive electrode line 31DR.

  As described above, the pattern composed of the sensing electrode lines 33SR is a pattern in which the periodicity of the pattern composed of the sensing reference electrode lines 40KR is broken, and the pattern composed of the drive electrode lines 31DR is This is a pattern in which the periodicity of the pattern composed of the line 41KR is broken. Therefore, when the electrode line pattern of the present embodiment is superimposed on the pixel pattern of the display panel 10, it is possible to suppress the occurrence of moire.

  On the other hand, when creating the sensing electrode line 33SR, the length ds1 of the diagonal line Ns1 in the reference direction is 0.25 times or less the reference period Ws in the displacement region Ss that defines the range of displacement of the reference bent portion 40Q, and The length ds2 of the diagonal line Ns2 is not more than 0.5 times the reference interval Ps. In addition, when creating the drive electrode line 31DR, the length dd1 of the diagonal line Nd1 in the reference direction is 0.25 times or less the reference period Wd in the displacement area Sd that defines the range of displacement of the reference bent portion 41Q, and The length dd2 of the diagonal line Nd2 is not more than 0.5 times the reference interval Pd. As a result, the electrode line pattern is prevented from being excessively irregular, and the occurrence of grain is suppressed.

  With reference to Table 1, the relationship between the size ranges of the displacement regions Ss and Sd and the suppression of moiré and grain will be described in detail. Table 1 is an electrode line pattern in which the pattern of the sensing electrode line 33SR and the pattern of the drive electrode line 31DR created based on the reference electrode lines 40KR and 41KR are superimposed, and the sizes of the displacement regions Ss and Sd are shown. The results of evaluating the degree of occurrence of moiré and grain by superimposing each of a plurality of electrode line patterns created by changing the pixel pattern are shown.

The patterns of the reference electrode lines 40KR and 41KR used to create the electrode line pattern and the configuration of the pixel pattern are shown below.
<Patterns of reference electrode lines 40KR and 41KR>
・ Reference angle αs = αd = 120 degrees ・ Reference width Hs = Hd = 360 μm
・ Reference cycle Ws = Wd = 1200 μm
・ Reference interval Ps = Pd = 360 μm
<Pixel pattern>
・ Pixel width P1 = P2 = 180 μm
11 types in which ds2 / Ps is twice as large as ds1 / Ws and 2 × ds1 / Ws, that is, ds2 / Ps is changed by 0.1 from 0 to 1 for the pattern of the sensing reference electrode line 40KR. Are set individually, and the reference bent portion 40Q is displaced in each displacement region Ss, thereby creating 11 types of patterns of the sensing electrode lines 33SR. Further, a displacement area Sd where dd1 = ds1 and dd2 = ds2 is set for the pattern of the drive reference electrode line 41KR so as to correspond to each displacement area Ss, and the reference bending portion 41Q is displaced. As a result, patterns of 11 types of drive electrode lines 31DR were created. Then, eleven types of electrode line patterns were created by superimposing the pattern of the sensing electrode lines 33SR and the pattern of the drive electrode lines 31DR in which the displacement areas Ss and Sd had the same size.

  That is, the values of 2 × ds1 / Ws, ds2 / Ps, 2 × dd1 / Wd, and dd2 / Pd are equal to each other for each electrode line pattern. Hereinafter, this value is referred to as a displacement value. When the displacement value is 0, the reference bent portions 40Q and 41Q are not displaced, and the electrode line pattern is a pattern in which the pattern of the sensing reference electrode line 40KR and the pattern of the drive reference electrode line 41KR are overlapped.

  The evaluation of the moire and the grain was visually performed. In the evaluation of moiré, “○” indicates that moiré is not visually recognized, “Δ” indicates that moiré is weakly recognized, and “x” indicates that moiré is strongly recognized. In the evaluation of the grain, “○” indicates that the grain is not visually recognized, “Δ” indicates that the grain is weakly recognized, and “X” indicates that the grain is strongly recognized. In addition, that the moiré is visually recognized means that a pattern like a stripe different from the electrode line pattern or the pixel pattern is visible in the area where the pattern is arranged, and that the grain is visually recognized, It means that the area where the pattern is arranged has a sand-like distribution of flickering, or the area looks glare.

As shown in Table 1, when the displacement value is 0, the moiré looks weak. The electrode line pattern composed of the reference electrode lines 40KR and 41KR has a lower periodicity than the lattice-shaped periodic structure. Further, as described above, in the pattern of the reference electrode lines 40KR and 41KR, the moire is suppressed by the parameters of the reference angles αs and αd, the reference periods Ws and Wd, the reference widths Hs and Hd, and the reference intervals Ps and Pd. This is the pattern set to the value to be set. Therefore, even when an electrode line pattern composed of the reference electrode lines 40KR and 41KR is used, moiré can be suppressed to some extent when overlapping with the pixel pattern. Then, in the case of an electrode line pattern in which the periodicity of the pattern of the reference electrode lines 40KR and 41KR is further broken by the displacement of the reference bent portions 40Q and 41Q, moire is further suppressed, and as shown in Table 1, the displacement value is reduced. When it is 0.1 or more, moire is not visible.

  On the other hand, when the displacement value is 0.4 or less, the grain is not visible, but when the displacement value is 0.5, the grain is weak, and when the displacement value is 0.6 or more, the grain is not visible. Looks strong. Thus, as the size of the displacement areas Ss and Sd is larger, that is, as the periodicity of the electrode line pattern is lower, the grain becomes stronger. However, when the displacement value is 0.5 or less, the grain becomes larger. It is suggested that it can be suppressed to some extent.

  Therefore, when the displacement value is more than 0 and not more than 0.5, both the suppression of moire and the suppression of grain can be achieved. That is, in the displacement region Ss, the length ds1 of the reference direction diagonal line Ns1 is 0.25 times or less of the reference period Ws, the length ds2 of the cross direction diagonal line Ns2 is 0.5 times or less of the reference interval Ps, In the displacement region Sd, if the length dd1 of the reference direction diagonal line Nd1 is 0.25 times or less of the reference period Wd and the length dd2 of the cross direction diagonal line Nd2 is 0.5 times or less of the reference interval Pd. In addition, both suppression of moire and suppression of grain can be achieved.

  From the results in Table 1, it is preferable that the displacement value be 0.1 or more in order to increase the moiré suppression effect. That is, it is preferable that the length ds1 of the reference diagonal line Ns1 is 0.05 times or more of the reference period Ws, and the length ds2 of the cross direction diagonal line Ns2 is 0.1 times or more of the reference interval Ps. Similarly, it is preferable that the length dd1 of the reference diagonal line Nd1 is at least 0.05 times the reference period Wd, and the length dd2 of the cross direction diagonal line Nd2 is at least 0.1 times the reference interval Pd.

  Furthermore, from the results in Table 1, it is preferable that the displacement value be 0.4 or less in order to increase the grain-grain suppression effect. That is, it is preferable that the length ds1 of the reference diagonal line Ns1 is 0.2 times or less of the reference period Ws, and the length ds2 of the cross direction diagonal line Ns2 is 0.4 times or less of the reference interval Ps. Similarly, it is preferable that the length dd1 of the reference direction diagonal line Nd1 is 0.2 times or less of the reference period Wd, and the length dd2 of the cross direction diagonal line Nd2 is 0.4 times or less of the reference interval Pd.

[Analysis of electrode wire pattern by FFT]
Subsequently, the configuration of the electrode line pattern will be further described using the result of analyzing the electrode line pattern by FFT. First, regarding the relationship between the size of the displacement regions Ss and Sd set in the reference electrode lines 40KR and 41KR and the periodicity of the electrode line patterns created from the reference electrode lines 40KR and 41KR, the pattern of the sensing electrode line 33SR is taken as an example. A description will be given with reference to FIGS.

  FIG. 14 shows a result of analyzing, by FFT, an example of a pattern of the sensing reference electrode line 40KR in which the occupancy ratio Hs / Ps is set to 1.0. Since the occupation ratio Hs / Ps is 1.0, the intensity of the frequency component g is much lower than that of the peak group including the basic spatial frequency components f1 and f2. Is omitted.

  FIGS. 15 to 17 are examples of patterns obtained by irregularly displacing the positions of the reference bent portions 40Q in the pattern of the sensing reference electrode lines 40KR used in the FFT analysis of FIG. 14 in the displacement region Ss. Shows the result of analyzing by FFT.

  FIG. 15 shows that each length ds1 of the reference direction diagonal line Ns1 in the displacement region Ss is about 0.1 times the reference period Ws, and that the length ds2 of the cross direction diagonal line Ns2 is about 0.2 times the reference interval Ps. The analysis result of the pattern which displaced the position of the bending part 40Q is shown.

  In the power spectrum shown in FIG. 15, in the frequency region higher than the basic spatial frequency components f1 and f2, points having a low average intensity appear as a band-like peak group as compared with FIG. 14. The strip-shaped points are distributed in a direction defined by the reference angle αs in the sensing reference electrode line 40KR. The reason why such a band-like point appears is that a non-periodic noise component increases due to the irregular displacement of the reference bent portion 40Q.

  FIG. 16 shows a case where the length ds1 of the reference direction diagonal line Ns1 in the displacement region Ss is about 0.25 times the reference period Ws, and the length ds2 of the cross direction diagonal line Ns2 is about 0.5 times the reference interval Ps. The analysis result of the pattern which displaced the position of the bending part 40Q is shown.

  In the power spectrum shown in FIG. 16, the number of band-like points based on the noise component is increased as compared with FIG. On the other hand, the higher-order term intensity of the frequency component based on the periodicity of the sensing reference electrode line 40KR decreases, suggesting that the higher-order component is buried in the noise.

  FIG. 17 shows a case where the length ds1 of the reference direction diagonal line Ns1 in the displacement area Ss is about 0.5 times the reference period Ws, and the length ds2 of the cross direction diagonal line Ns2 is about 1.0 times the reference interval Ps. The analysis result of the pattern which displaced the position of the bending part 40Q is shown. In the power spectrum shown in FIG. 17, only the fundamental spatial frequency can be confirmed as a peak.

Further, as the lengths ds1, ds2 in the displacement region Ss become longer, that is, as the displacement region Ss becomes larger, the intensity of the basic spatial frequency components f1, f2 becomes lower.
FIG. 18 is a diagram showing a relationship between the intensity of the basic spatial frequency components f1 and f2 and the size of the displacement area Ss. In FIG. 18, the vertical axis indicates a relative value obtained by dividing the basic spatial frequency intensity by the DC component intensity, and the horizontal axis indicates displacement values, that is, 2 × ds1 / Ws and ds2 / Ps.

  As shown in FIG. 18, the basic spatial frequency intensity linearly decreases when the displacement value exceeds 0.2. That is, as the displacement value becomes larger than 0.2, the number of moire-inducing elements in the pattern of the sensing electrode lines 33SR is reduced, and the possibility of occurrence of moire when overlapping with another periodic structure is reduced.

  As described above, in the power spectrum obtained by performing the two-dimensional Fourier transform on the pattern composed of the plurality of sensing electrode lines 33SR, the peaks that are the basic spatial frequency components and the spatial frequency region higher than the basic spatial frequency A peak group, which is a band-like distribution in which points having an average intensity lower than the spatial frequency component, appears. These peaks and peak groups are four directions extending radially from the origin, and appear along each of the four directions located in line symmetry with respect to each of two coordinate axes orthogonal to each other at the origin. . These four directions are directions defined by the reference angle αs in the sensing reference electrode line 40KR.

  The peaks and peak groups are defined by the angle of the sensing electrode line 33SR at the bent portion 33Q including the first bent portion and the second bent portion, the distance between the first bent portions adjacent to each other, the second bent portion adjacent to each other. The distance between the parts is a peak derived from these periodicities.

  Further, a power spectrum obtained by two-dimensional Fourier transform of a pattern composed of a plurality of drive electrode lines 31DR also has similar characteristics. That is, the peaks and peak groups appear in the four directions defined by the reference angle αd in the drive reference electrode line 41KR. Such peaks and peak groups are defined by the angle of the drive electrode line 31DR in the bent portion 31Q including the first bent portion and the second bent portion, the distance between the first bent portions adjacent to each other, the second bent portion adjacent to each other. The distance between the parts is a peak derived from these periodicities.

  FIG. 19 shows an example of an electrode line pattern in which the pattern of the sensing electrode line 33SR and the pattern of the drive electrode line 31DR are superimposed, that is, the result of analyzing by FFT an example of the electrode line pattern as shown in FIG. Is shown.

  In the power spectrum shown in FIG. 19, the basic spatial frequency components f1 and f2 caused by the periodicity of the sensing reference electrode line 40KR and the basic spatial frequency components f3 and f4 caused by the periodicity of the drive reference electrode line 41KR are combined. 8 peaks appear.

  In the present embodiment, the first electrode direction D1, which is the direction in which the sensing electrode line 33SR extends, and the second electrode direction D2, which is the direction in which the drive electrode line 31DR extends, are orthogonal to each other. Therefore, the positions of the eight peaks are arranged line-symmetrically with respect to each of the u-axis and the v-axis.

[Action]
The operation of the present embodiment will be summarized. As shown by the analysis results of the FFT described above, the electrode line pattern of the present embodiment has increased noise with the basic spatial frequency component remaining as compared with the pattern formed of the reference electrode lines 40KR and 41KR. Low periodicity. Therefore, when the electrode line pattern of the present embodiment is used, a shift between the pixel pattern and the electrode line pattern is less likely to be recognized as a shift between the two periodic structures, so that moire is suppressed from being visually recognized.

  In recent years, in which the size and resolution of display panels have been diversified, in order to reduce the design load of the electrode line patterns, a plurality of display panels having the same size and different resolutions or different sizes and the same size have been used. It is desired to apply an electrode line having a common pattern between a plurality of display panels having a moderate resolution. The degree of occurrence of moire varies depending on the relationship between the periodic structure of the electrode lines and the periodic structure of the pixels. It is necessary to design a precise electrode line pattern while evaluating the degree of occurrence of moire for each periodic structure, that is, for each size and resolution of the display panel. The display panel that can suppress moire by the electrode line pattern designed in this way is, after all, limited to the display panel evaluated at the time of design.

  On the other hand, in the present embodiment, the periodicity of the electrode line pattern, that is, the periodicity of the presence or absence of the structure in the first electrode direction D1 and the second electrode direction D2 is low, so that the display panel having more various pixel patterns is provided. With respect to 10, moire can be suppressed from being visually recognized.

  The basic spatial frequency component is defined by the shapes of the reference electrode lines 40KR and 41KR. Therefore, when the parameters of the reference electrode lines 40KR and 41KR are superimposed on a plurality of display panels 10 having different sizes and resolutions, the moire pattern is applied to each display panel 10. Is set so as to suppress the occurrence of moiré due to the periodicity based on the fundamental spatial frequency component.

  The electrode line pattern according to the present embodiment has periodicity due to the irregular displacement of the reference bent portions 40Q and 41Q, as well as the plurality of display panels 10 used for setting each parameter in the reference electrode lines 40KR and 41KR. Is reduced, the occurrence of moire is suppressed for display panels 10 having more various pixel patterns other than the plurality of display panels 10.

  On the other hand, in the electrode line pattern of the present embodiment, the size of the displacement areas Ss, Sd, which is the range of displacement of the reference bent portions 40Q, 41Q in the reference electrode lines 40KR, 41KR, is equal to the reference period Ws, The size is kept within a predetermined range defined by the ratio of the length of the diagonal line to Wd and the reference intervals Ps and Pd. As a result, excessive irregularity of the electrode wire pattern is suppressed to such an extent that generation of grain is suppressed. That is, it is possible to suppress the occurrence of bias in the density of the electrode wires in the electrode wire pattern, and it is possible to suppress the perception of flickering and screen glare distributed in a sand form from the operation surface.

  Therefore, by using the electrode line pattern of the present embodiment, it is possible to achieve both suppression of moire and suppression of grain. As a result, in the display device 100 including the touch panel 20 having the electrode line pattern according to the present embodiment, a decrease in display quality is suppressed.

  In the above embodiment, the transparent dielectric substrate 33 is an example of a transparent dielectric layer. The front surface of the transparent dielectric substrate 33 is an example of a first surface, and the back surface of the transparent dielectric substrate 33 is an example of a second surface. Further, the sensing electrode line group 33SG is an example of a first electrode line group, and the drive electrode line group 31DG is an example of a second electrode line group. The first electrode direction D1 is a first direction and a second intersecting direction, and the second electrode direction D2 is a second direction and a first intersecting direction.

  When the sensing electrode line group 33SG is a target electrode line group including a plurality of electrode lines created based on a plurality of reference electrode lines, the first electrode direction D1 is a reference direction, and the second electrode direction D1 is a reference direction. The direction D2 is the reference cross direction. When the drive electrode line group 31DG is the target electrode line group, the second electrode direction D2 is the reference direction, and the first electrode direction D1 is the reference cross direction.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since each of the sensing electrode line 33SR and the drive electrode line 31DR has a bent line shape that bends irregularly, compared with an electrode line pattern composed of electrode lines having a regular bent line shape, The periodicity of the electrode line pattern is low. Therefore, regarding the suppression of the moiré, the influence on the periodicity of the pixel pattern is suppressed to be low, and when the touch panel 20 having such an electrode line pattern is overlapped with the display panel 10, the moiré is suppressed from being visually recognized. . Each of the sensing electrode line 33SR and the drive electrode line 31DR has a bent line shape obtained by irregularly displacing the reference bent portions 40Q, 41Q of the reference electrode lines 40KR, 41KR having a regular bent line shape. When the sizes of the displacement regions Ss and Sd, which are the ranges of displacement of the reference bent portions 40Q and 41Q, are within the above-described range, the electrode line pattern becomes excessively irregular. Can be suppressed to the extent that can be suppressed. Therefore, by using the electrode wire pattern having the above configuration, it is possible to achieve both the suppression of moire and the suppression of grain.

  (2) In the plurality of short line portions 33E constituting the sensing electrode line 33SR, the length L1 of the short line portion 33E and the inclination θ1 of the short line portion 33E with respect to the first electrode direction D1 are irregularly changed. The drive electrode line 31DR also has a similar irregularity. Therefore, an electrode wire having a bent line shape that bends irregularly is accurately realized.

  (3) All of the plurality of short line portions 33E of the sensing electrode line 33SR intersect or contact with one base axis A1. In addition, all of the plurality of short line portions 31E of the drive electrode line 31DR intersect or contact one base axis B1. According to such a configuration, since the bent portion that is the peak portion and the bent portion that is the valley portion are arranged so as to spread in the direction in which the electrode lines are arranged, the degree of bending at the bending line increases, and the irregular bending line shape Can be accurately realized. The base axis A1 arranged for each of the plurality of sensing electrode lines 33SR and the base axis B1 arranged for each of the plurality of drive electrode lines 31DR are arranged along the direction in which the electrode lines are arranged. Are arranged at predetermined intervals. According to such a configuration, in the sensing electrode wire group 33SG and the drive electrode wire group 31DG, excessive bias in the positions of the electrode wires and the positions of the bent portions is suppressed, so that a bias occurs in the electrode wire density in the electrode wire pattern. Is suppressed.

  (4) The variation in the number of bent portions 33Q in the sensing electrode wire group 33SG is 5% or less, and the variation in the number of bent portions 31Q in the drive electrode wire group 31DG is 5% or less. According to such a configuration, occurrence of bias in the density of the electrode wires in the electrode wire pattern is suppressed. Further, since the sensing electrode lines 33SR adjacent to each other and the drive electrode lines 31DR adjacent to each other are prevented from intersecting or contacting with each other, the electrodes are formed at the intersections of the electrode lines or at the corners formed at the contact portions. It is possible to prevent the electrode lines from being easily recognized due to the thick lines.

  (5) In the pattern composed of the plurality of reference electrode lines 40KR and 41KR, the ratio of the reference widths Hs and Hd to the reference intervals Ps and Pd is 0.7 or more and 1.3 or less. According to such a configuration, the intensity of the frequency component of the element extending in the extending direction of the reference electrode lines 40KR and 41KR, which appears in the FFT analysis of the pattern of the reference electrode lines 40KR and 41KR, can be suppressed to be low, so that the reference electrode lines 40KR and 41KR. When the pattern is superimposed on the display panel 10, moire hardly occurs. As a result, even in an electrode line pattern created based on the reference electrode lines 40KR and 41KR, moire does not easily occur when the electrode line pattern is overlapped with the display panel 10.

  (6) In a pattern composed of a plurality of reference electrode lines 40KR and 41KR, if the reference angles αs and αd are 95 degrees or more, the operation is caused due to an excessive number of reference bent portions 40Q and 41Q. Since the ratio of the electrode wires occupying in the plane is suppressed from becoming excessive, a decrease in the light transmittance of the touch panel 20 is suppressed. On the other hand, if the reference angles αs and αd are equal to or less than 150 degrees, the reference periods Ws and Wd are maintained in a range that is not too large, so that the reference intervals Ps and Pd and the reference widths Hs and Hd with respect to the reference intervals Ps and Pd. It is easy to set the ratio to a value within an appropriate range.

  (7) In the power spectrum obtained by the two-dimensional Fourier transform of the pattern composed of the plurality of sensing electrode lines 33SR, four directions extending radially from the origin and two coordinate axes orthogonal to the origin are provided. When the four directions symmetrically positioned with respect to each other are defined as the periodic direction, the angle of the sensing electrode line 33SR at the first bent portion, the angle of the sensing electrode line 33SR at the second bent portion, the distance between the first bent portions adjacent to each other. , The distance between the second bent portions adjacent to each other, and peaks derived from these periodicities are distributed in a band shape along each periodic direction. A similar power spectrum can be obtained for a pattern composed of a plurality of drive electrode lines 31DR. In the configuration in which such a power spectrum is obtained for the pattern of the sensing electrode line 33SR and the pattern of the drive electrode line 31DR, the periodicity of the electrode line pattern is suppressed low, so that the display panel 10 having various pixel patterns can be used. Therefore, it is possible to suppress the moire from being visually recognized.

  (8) In the power spectrum, the band-shaped peaks include peaks that are stronger than the peaks derived from the periodicity of only the second electrode direction D2 in the plurality of sensing electrode lines 33SR. Similarly, in the power spectrum obtained by the two-dimensional Fourier transform of the pattern composed of the plurality of drive electrode lines 31DR, similarly, the peak distributed in a band shape is only in the first electrode direction D1 in the plurality of drive electrode lines 31DR. Includes peaks that are stronger than peaks due to periodicity. According to such a configuration, the periodicity of the electrode line pattern in the direction in which the electrode lines are arranged is suppressed to a low level, so that moire can be accurately viewed on the display panel 10 having various pixel patterns. Can be suppressed.

[Modification]
The above embodiment can be modified and implemented as follows.
Each of the sensing electrode line 33SR and the drive electrode line 31DR has the reference bent portions 40Q and 41Q of the reference electrode lines 40KR and 41KR having a regular bent line shape irregular in the displacement regions Ss and Sd in the above-described range. If it has the bent line shape displaced to the shape of the sensing electrode line 33SR and the drive electrode line 31DR, the shape of the electrode line pattern composed of these electrode lines 33SR and 31DR, the shape of the reference electrode lines 40KR and 41KR, Even if the shape and the shape of the electrode line pattern composed of these electrode lines 40KR and 41KR are not the same as the shape of the above-described embodiment, the effect according to the above (1) can be obtained. For example, the shape of the reference electrode lines 40KR and 41KR may be different from that of the above-described embodiment as long as it is a periodic bent line shape. And may be different. In the sensing electrode line 33SR and the drive electrode line 31DR created from the reference electrode lines 40KR and 41KR, the angle formed by the direction in which the sensing electrode line 33SR extends and the direction in which the drive electrode line 31DR extends, the sensing electrode line In the group 33SG and the drive electrode line group 31DG, the angle between the direction in which the electrode lines extend and the direction in which the electrode lines are arranged may be different from that in the above embodiment. Further, for example, the bent portions 33Q and 31Q in the sensing electrode wire 33SR and the drive electrode wire 31DR may have a curvature.

  -The sensing electrode line group 33SG and the drive electrode line group 31DG of the above embodiment, that is, the sensing electrode line group 33SG composed of a plurality of sensing electrode lines 33SR having a bent line shape that bends irregularly, and irregularly bent Drive electrode line group 31DG composed of a plurality of drive electrode lines 31DR having a bent line shape, is disposed at least in a region where moire and grain are desired to be suppressed on a surface on which each electrode line group is disposed. Just do it.

  As shown in FIG. 20, in the conductive film 21 forming the touch panel 20, the transparent substrate 31 and the transparent adhesive layer 32 may be omitted. In such a configuration, of the surface of the transparent dielectric substrate 33, the back surface facing the display panel 10 is set as the drive electrode surface 31S, and the drive electrode 31DP is located on the drive electrode surface 31S. The surface of the transparent dielectric substrate 33 which is the surface opposite to the back surface is the sensing electrode surface 33S, and the sensing electrode 33SP is located on the sensing electrode surface 33S. In such a configuration, the drive electrode 31DP is formed by, for example, patterning one thin film formed on one surface of the transparent dielectric substrate 33 by etching, and the sensing electrode 33SP is formed of, for example, a transparent dielectric substrate. One thin film formed on the other surface of the body substrate 33 is formed by patterning by etching.

  Note that, in the configuration in which the sensing electrode line group 33SG and the drive electrode line group 31DG are formed on different base materials as in the above-described embodiment, compared with a configuration in which electrode lines are formed on both surfaces of one base material. Thus, the formation of the electrode wire is easy.

  21, as shown in FIG. 21, in the touch panel 20, the drive electrode 31DP, the transparent substrate 31, the transparent adhesive layer 32, the transparent dielectric substrate 33, the sensing electrode 33SP, and the transparent adhesive layer 23 are arranged in order from the components close to the display panel 10. , The cover layer 22 may be located.

  In such a configuration, for example, the drive electrode 31DP is formed on one surface serving as the drive electrode surface 31S of the transparent substrate 31, and the sensing electrode 33SP is formed on one surface serving as the sensing electrode surface 33S of the transparent dielectric substrate 33. Is done. Then, a surface of the transparent substrate 31 opposite to the drive electrode surface 31S and a surface of the transparent dielectric substrate 33 opposite to the sensing electrode surface 33S are bonded by the transparent adhesive layer 32. In this case, the transparent substrate 31, the transparent adhesive layer 32, and the transparent dielectric substrate 33 constitute a transparent dielectric layer, and the sensing electrode surface 33S of the transparent dielectric substrate 33 is the first surface. The drive electrode surface 31S is the second surface.

  The display panel 10 and the touch panel 20 need not be formed separately, and the touch panel 20 may be formed integrally with the display panel 10. In such a configuration, for example, in the conductive film 21, the plurality of drive electrodes 31DP are located on the TFT layer 13, while the plurality of sensing electrodes 33SP are located between the color filter substrate 16 and the upper polarizer 17. Configuration. Alternatively, an on-cell type configuration in which the conductive film 21 is located between the color filter substrate 16 and the upper polarizing plate 17 may be used. In such a configuration, a layer sandwiched between the drive electrode 31DP and the sensing electrode 33SP constitutes a transparent dielectric layer.

  A1, B1 base axis, A2, B2 virtual line, A3, B3 virtual line segment, D1 first electrode direction, D2 second electrode direction, ND capacitance detection unit, Ss, Sd displacement area, Ns1 .., Nd1... Reference direction diagonal, Ns2, Nd2... Cross direction diagonal, Ps, Pd... Reference interval, Hs, Hd. Lower polarizing plate, 12: Thin film transistor substrate, 13: TFT layer, 14: Liquid crystal layer, 15: Color filter layer, 15P: Pixel, 16: Color filter substrate, 17: Upper polarizing plate, 20: Touch panel, 21: Conductivity Film, 22 cover layer, 23 transparent adhesive layer, 31 transparent substrate, 31DP drive electrode, 31DR drive electrode wire, 31DG drive electrode wire group, 31S drive electrode surface, 31E ... Short line part, 31Q ... Bend part, 33 ... Transparent dielectric substrate, 33SP ... Sensing electrode, 33SR ... Sensing electrode line, 33SG ... Sensing electrode line group, 33S ... Sensing electrode surface, 33E ... Short line part, 33Q ... Bend part, Reference numeral 34: selection circuit, 35: detection circuit, 36: control unit, 40KR: sensing reference electrode line, 41KR: drive reference electrode line, 40E, 41E: reference short line portion, 40Q, 41Q: reference bending portion, 100: display device.

Claims (6)

A transparent dielectric layer having a first surface and a second surface opposite to the first surface;
A first electrode line group including a plurality of electrode lines extending along a first direction on the first surface of the transparent dielectric layer and arranged in a first intersecting direction intersecting the first direction; When,
On the second surface of the transparent dielectric layer, a plurality of electrode lines extend along a second direction intersecting the first direction and are arranged in a second intersecting direction intersecting the second direction. A second electrode wire group to be provided,
Each of the first electrode line group and the second electrode line group is a target electrode line group, and the first direction with respect to the first electrode line group and the second direction with respect to the second electrode line group, respectively. A reference direction, wherein each of the first cross direction with respect to the first electrode line group and the second cross direction with respect to the second electrode line group is a reference cross direction,
The target electrode line group is a plurality of reference electrode lines which are virtual electrode lines having a bent line shape extending in the reference direction, and a first virtual bent portion and a second virtual bent portion are formed on the reference electrode line. A plurality of the first imaginary bent portions and a plurality of the second imaginary bent portions are located on separate straight lines extending in the reference direction, and the reference intersections are provided. In the plurality of reference electrode lines arranged at predetermined reference intervals in the direction, the reference bending portions, which are each of the first virtual bending portion and the second virtual bending portion, are each a reference electrode line. It is composed of a plurality of the electrode wires having a bent line shape irregularly displaced with respect to the order of arrangement of the reference bent portion in,
In the reference electrode line, a distance between two reference bending portions adjacent to each other in the reference direction is a reference period, and the center of the reference bending portion before the displacement is equal to or less than 0.25 times the reference period. A rhombic virtual region having a length and a diagonal line extending in the reference direction and a diagonal line having a length of 0.5 times or less the reference interval and extending in the reference cross direction is a displacement region. The conductive film, wherein the reference bent portion after the displacement is located in the displacement region. Each of the plurality of electrode lines constituting the target electrode line group is a set of a plurality of short line portions having a linear shape connecting adjacent bent portions along each electrode line,
The length of the short line portion and the inclination of the short line portion with respect to the reference direction in the plurality of short line portions are irregularly changed with respect to the order in which the short line portions are arranged in each electrode line. The conductive film as described in the above. Each of the plurality of electrode wires constituting the target electrode wire group has a plurality of first bent portions and a plurality of second bent portions, and the first bent portion and the second bent portion are the electrode wires. Has a bent line shape that is alternately arranged one by one along
In a power spectrum obtained by two-dimensional Fourier transform of a plurality of electrode lines constituting the target electrode line group,
Four directions extending radially from the origin, and four directions located in line symmetry with respect to each of two coordinate axes orthogonal to each other at the origin are periodic directions,
Among the electrode lines constituting the target electrode line group, an angle of the electrode line at the first bent portion, an angle of the electrode line at the second bent portion, and a distance between the adjacent first bent portions. The plurality of electrode lines constituting the target electrode line group are configured such that a distance between the second bent portions adjacent to each other, and peaks derived from these periodicities are distributed in a band shape along each periodic direction. The conductive film according to claim 1. In the power spectrum, the target electrode line so that a peak stronger than a peak derived from the periodicity only in the reference cross direction in the plurality of electrode lines constituting the target electrode line group includes a peak distributed in the band shape. The conductive film according to claim 3, wherein a plurality of electrode wires constituting the group are configured. The conductive film according to any one of claims 1 to 4,
A cover layer covering the conductive film,
A touch panel comprising: a peripheral circuit that measures a capacitance between the electrode line disposed on the first surface and the electrode line disposed on the second surface. A display panel that has a plurality of pixels arranged in a lattice and displays information;
A touch panel that transmits the information displayed on the display panel,
A control unit for controlling the driving of the touch panel,
The display device, wherein the touch panel is the touch panel according to claim 5.