JP2011128896A - Electrostatic capacitance touch panel and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel input device which completely eliminates a stray capacity between detection electrodes and improves the detection sensitivity of detection electrodes where the stray capacity increases, and a method of manufacturing the same. <P>SOLUTION: A pair of third ground patterns wired along both sides of a first electrode are electrically connected with fourth ground patterns wired to other sides of a first connecting pattern of the first electrode with a first coating sandwiched therebetween at a cross area where the first electrode orthogonally intersect with a second electrode. Thus, the first electrode and the second electrode are wired in a matrix shape on an insulating substrate, and furthermore, ground patterns are wired on the substrate in a mesh shape while the first electrode and the second electrode are insulated, so that the stray capacity is eliminated between the detection electrodes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a capacitive touch panel that detects a detection electrode in which stray capacitance increases when an input operation body of an input operation approaches and detects the input operation position from the arrangement position of the detection electrode, and a method for manufacturing the same. Specifically, the present invention relates to a capacitive touch panel that detects a two-dimensional input operation position in an orthogonal XY direction on an insulating substrate and a manufacturing method thereof.

  As a pointing device for pointing and inputting icons etc. displayed on the display of electronic devices, the input operation body such as a finger approaches the detection electrode on the input operation surface, and changes to the input operation surface in a non-contact manner. There is known a capacitive touch panel for detecting the input operation position.

  In a conventional capacitive touch panel, a large number of X-side electrodes and Y-side electrodes are arranged in a matrix so as to cross each other on an insulating substrate, and an input operation body such as a finger approaches to make a stray capacitance. The increasing X-side electrode and Y-side electrode are detected, and the input operation position to the insulating substrate is detected as the input operation is performed at the arrangement position of the electrodes (Patent Document 1).

  In this capacitive touch panel 100, as shown in FIG. 8, an X-axis input switch 101 connected to many X-side electrodes and a Y-axis input switch 102 connected to many Y-side electrodes are sequentially switched and controlled. Applying a predetermined pulse voltage from the oscillation circuit 103 to a large number of X-side electrodes and Y-side electrodes for scanning, and simultaneously switching the other side of the applied electrodes to the arithmetic circuit 106 by switching the switches 104 and 105 to the other side Read the potential.

  Since the stray capacitance increases at an electrode that an input operation body such as a finger approaches, a part of the current flowing through the electrode by applying a pulse voltage flows through the stray capacitance, and the potential on the other side detected by the arithmetic circuit 106 is The electric potential is lower than the potential before the input operation body is brought closer. Since a large number of X-side electrodes and Y-side electrodes are arranged in a matrix on the insulating substrate, when the input operation body is brought close to the insulating substrate, at least the X side wired along the Y direction. The other-side potential of any one of the Y-side electrodes wired along the X direction decreases, and the arithmetic circuit 106 determines the XY coordinates from the arrangement position of the X-side electrode and the Y-side electrode where the potential has decreased. The input operation position represented by is detected.

  Here, the stray capacitance of the detection electrode, which increases as the input operation body approaches, is a minute value of 10 pF or less, and the stray capacitance with the other electrode orthogonal to the electrode to detect the stray capacitance or external noise There was a problem that it was easily affected and the detection sensitivity was lowered.

  Therefore, Patent Document 2 discloses a touch panel in which a shield layer is arranged on the back surface of an insulating substrate on which detection electrodes are arranged to shield from external noise.

  Further, in the capacitive touch panel 100 described in Patent Document 1, a shield electrode switching control circuit 107 is provided, and the other electrode orthogonal to the electrode (for example, the X side electrode) that scans by applying a pulse voltage. (For example, the Y-side electrode) is grounded, and an electrode orthogonal to the electrode to be measured is used as a shield electrode to reduce the influence of stray capacitance with the other electrode and the external conductor.

JP 2009-175784 A

JP 2009-086184 A

  However, in the touch panel in which the shield layer is provided on the back surface of the insulating substrate on which the detection electrode is arranged, the shield layer 201 and the detection electrode 202 are capacitively coupled as shown in FIG. For stray capacitance Cx of 10 pF or less, capacitances C1 and C2 of several tens of pF that cannot be ignored are generated between each detection electrode and the shield layer, and the detection sensitivity is lowered.

  Further, in the capacitive touch panel 100 in which an electrode orthogonal to the electrode to be measured is a shield electrode, the ground line serving as the shield electrode (for example, the Y-side electrode) detects an increase in stray capacitance (for example, the X-side electrode). The stray capacitance C3 (see FIG. 9) between the electrodes to be detected (for example, the X side electrode) is generated even when the other electrode is used as a shield electrode, thereby improving the detection sensitivity. It is not possible. While it is desirable to arrange a large number of detection electrodes at a narrow pitch in order to increase the detection accuracy of the input operation position, the stray capacitance to be detected for each detection electrode is proportional to the area facing the input operation body. It is necessary to enlarge the surface area on the insulating substrate as much as possible. As a result, the adjacent detection electrodes approach each other, and the increase in the stray capacitance C3 cannot be avoided.

  Further, in the conventional capacitive touch panel 100, it is necessary to ground the detection electrode on the other side every time the input operation position in the X direction and the Y direction is detected, and it is necessary to provide an extra shield electrode switching control circuit 107. In addition, switching control is troublesome, and since the ground line is formed only along one direction, noise from the outside cannot be sufficiently blocked.

  The present invention has been made in view of such conventional problems, and a touch panel input device that completely removes the stray capacitance between the detection electrodes and increases the detection sensitivity of the detection electrode that increases the stray capacitance, and its manufacture. It aims to provide a method.

  In order to achieve the above-described object, the capacitive touch panel according to claim 1 includes a plurality of first electrodes and a plurality of second electrodes wired in a matrix on an insulating substrate along directions orthogonal to each other. And an insulating region that is disposed between the first electrode and the second electrode in an intersecting region where the first electrode and the second electrode intersect and insulates the intersecting first electrode and the second electrode. Then, the change in the stray capacitance of each first electrode and each second electrode is detected, and the detected object approaches the insulating substrate from the arrangement position of the first electrode and the second electrode on which the stray capacitance has changed on the insulating substrate. The capacitive touch panel detects an input operation position of an input operation to be performed, and is wired between adjacent first electrodes on the insulating substrate along the wiring direction of the first electrode, and an insulating coat is interposed in the intersecting region. A plurality of first groups wired on the other side of the second electrode and insulated from the second electrode. Between the second electrode and the second electrode adjacent to each other on the insulating substrate along the wiring direction of the second electrode, and is wired to the other side of the first electrode through the insulating coat at the intersection region. A plurality of second ground patterns to be insulated are provided, and each of the plurality of first ground patterns and each of the second ground patterns are electrically connected to each other on a portion of the insulating substrate that intersects each other.

  Since the first ground pattern and the second ground pattern are wired between the adjacent first electrodes or between the second electrodes, stray capacitance does not occur between the adjacent electrodes, and the first electrode or the second electrode is highly accurate. The change in stray capacitance between the target and the detected object can be detected.

  Since the first ground pattern and the second ground pattern are insulated and wired with the second electrode or the first electrode on the other side intersecting via the insulating coat that insulates the first electrode and the second electrode in the intersecting region, On the insulating substrate on which the first electrode and the second electrode are wired in a matrix, a ground pattern is further wired in a matrix so as to be insulated from the first electrode and the second electrode.

  In addition, the capacitive touch panel according to claim 2 includes a plurality of first electrodes and a plurality of second electrodes wired in a matrix on the insulating substrate along directions orthogonal to each other, and a first electrode, Each of the first electrodes has an insulating coating that is disposed between the first electrode and the second electrode in an intersecting region where the second electrode intersects and insulates the intersecting first electrode and the second electrode. The input operation of the input operation of detecting the change in the stray capacitance of each second electrode and bringing the detected object closer to the insulating substrate from the arrangement position of the first electrode and the second electrode on which the stray capacitance has changed on the insulating substrate. A capacitive touch panel for detecting a position, wherein each first electrode includes a plurality of rhombus-shaped first pattern bodies that become narrower toward an intersecting region, and a first portion between the first pattern bodies in the intersecting region. A strip-shaped first connection pattern that is continuously integrated along the wiring direction of the electrodes; Each second electrode has a plurality of rhombus-shaped second pattern bodies complementary to the first pattern body on the insulating substrate, straddling the first connection pattern at the intersection region, and the second electrode body between the second pattern bodies. A second connection pattern in a strip shape connected along the wiring direction, and a third ground pattern is wired on both sides of each first electrode along the gap between the outline of the first electrode and the second pattern body, At the intersection region, the first coat portion of the insulating coat is bridged across the first connection pattern, and the second coat portion is bridged across the third ground pattern on both sides of the first connection pattern, and on both sides of the first electrode. A fourth ground pattern for electrically connecting the pair of third ground patterns wired along the second wiring pattern is wired to the other side of the first connection pattern with the first coat portion interposed therebetween, and the second connection pattern is connected to the second coat portion. The first connecting pad across Wherein the wire to the other side of the over emissions, and a third ground pattern.

  Since the first pattern body of the first electrode and the second pattern body of the second electrode are formed in a rhombus shape complementary to each other on the insulating substrate, the exposed area of the insulating substrate is small, and a large number of each electrode is efficiently The pattern is wired.

  Since the second electrode or the first electrode on the other side is wired between the adjacent first electrodes or between the second electrodes, a large stray capacitance does not occur between them. Further, since the third ground pattern is wired between the adjacent first electrode and the second electrode, no stray capacitance is generated between these electrodes, and the first electrode or the second electrode and the object to be detected with high accuracy. Changes in stray capacitance between them can be detected.

  A pair of third ground patterns wired along both sides of the first electrode are electrically connected by the fourth ground pattern wired to the other side of the first connection pattern via the first coat portion in the intersecting region. Therefore, on the insulating substrate on which the first electrode and the second electrode are wired in a matrix, a ground pattern that further insulates from the first electrode and the second electrode is wired in a mesh pattern.

  The capacitive touch panel according to claim 3 is characterized in that the first electrode and the third ground pattern and / or the second electrode and the fourth ground pattern are formed of the same conductive material.

  Since the first electrode and the third ground pattern or the second electrode and the fourth ground pattern are respectively wired on the same side of the insulating coat, both can be formed in the same process by using the same conductive material.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a capacitive touch panel in which a first layer including a first electrode, a third ground pattern, and a second pattern body is formed in each intersection region of an insulating substrate. A step, a second step of forming a second layer comprising a first coat portion and a second coat portion of an insulating coat in each intersection region, and a second connection pattern and a fourth ground pattern in each intersection region The third step of forming the third layer, the first step, the second step, the third step, or the third step, the second step, the first step, the first layer and the second layer, The capacitive touch panel according to claim 2 is manufactured by stacking a third layer and electrically connecting each portion facing in the stacking direction in each step.

  Since the first layer and the third layer made of the conductive pattern are laminated on both sides of the second layer made of the insulating coat, the third ground pattern is connected between the second pattern body and the fourth ground pattern, which are electrically connected to each other. And a part of the fourth ground pattern is overlapped in the stacking direction, and the first coat part or the second coat part of the second layer is interposed between the conductive patterns to be insulated. 2 is manufactured by a simple process.

  The method of manufacturing a capacitive touch panel according to claim 5 includes the first electrode of the first layer, the third ground pattern, the second pattern body, and / or the second connection pattern of the third layer and the fourth ground. The pattern is formed of the same conductive material.

  By using the same conductive material for each pattern of the first layer and the third layer, each layer can be formed in one step.

  According to the first aspect of the present invention, since no stray capacitance is generated between the adjacent first electrodes or between the second electrodes, a change in the stray capacitance between the first electrode or the second electrode and the detected object is detected with high accuracy. it can.

  In addition, since the ground pattern is wired in a matrix form on the insulating substrate so as to be insulated from the first electrode and the second electrode, the matrix-like ground pattern blocks intrusion of external noise to the first electrode or the second electrode. Is done. Therefore, the input operation position can be detected without necessarily forming the shield layer on the back side of the insulating substrate, and when the shield layer is not formed, a large stray capacitance is not generated between the first electrode or the second electrode and the shield layer. Therefore, the detection accuracy of the stray capacitance with the detection object is increased.

  According to the invention of claim 2, the second electrode or the first electrode on the other side is wired between the adjacent first electrodes or the second electrodes, respectively, and between the adjacent first electrode and the second electrode. Since the third ground pattern is wired, a large stray capacitance does not occur between any electrodes, and a change in stray capacitance between the first electrode or the second electrode and the detection target can be detected with high accuracy.

  Further, since the ground pattern is wired in a mesh pattern on the insulating substrate so as to be insulated from the first electrode and the second electrode, intrusion of external noise to the first electrode or the second electrode is shielded by the mesh pattern. Is done. Therefore, the input operation position can be detected without necessarily forming the shield layer on the back side of the insulating substrate. If the shield layer is not formed, a large stray capacitance does not occur between the first electrode or the second electrode and the shield layer. Therefore, the detection accuracy of the stray capacitance with the object to be detected is increased.

  According to the invention of claim 3, the first electrode and the third ground pattern or the second electrode and the fourth ground pattern can be formed in the same process, and the manufacturing process can be shortened.

  According to invention of Claim 4, the electrostatic capacitance type touch panel of Claim 2 can be manufactured by the simple process of laminating | stacking 3 layers on an insulated substrate.

  Furthermore, the capacitive touch panel according to claim 2 can be manufactured even if each layer is laminated in the order of the first step, the second step, and the third step, or in the order of the third step, the second step, and the first step. Therefore, the process order can be arbitrarily selected according to the characteristics of the capacitive touch panel and the convenience of the manufacturing process.

  According to invention of Claim 5, a 1st process and / or a 3rd process can be made into one lamination process, respectively.

FIG. 1 is a block diagram of a capacitive touch panel 1 and an input operation position detection circuit 10 according to the first embodiment of the present invention. FIG. 2 is a main part plan view showing the intersecting region 1A of the capacitive touch panel 1. FIG. 3A shows a first layer laminated in the first step of manufacturing the capacitive touch panel 20 according to the second embodiment of the present invention. FIG. b) It is explanatory drawing which expands and shows the intersection area | region 20A of the principal part, respectively. 4A and 4B show the second layer laminated in the second step of manufacturing the capacitive touch panel 20, FIG. 4A shows the entire capacitive touch panel 20, and FIG. It is explanatory drawing which expands and shows each. 5A and 5B show the third layer laminated in the third step of manufacturing the capacitive touch panel 20, FIG. 5A shows the entire capacitive touch panel 20, and FIG. It is explanatory drawing which expands and shows each. 6A and 6B show the capacitive touch panel 20 as a whole, FIG. 6B shows the intersection area 20A of the main part, and FIG. 6C further enlarges the intersection area 20A. It is a top view. FIG. 7 is an explanatory diagram illustrating only the ground patterns 25 and 26 wired on the surface of the capacitive touch panel 20. FIG. 8 is a block diagram showing a conventional capacitive touch panel 100. 9A and 9B show a conventional capacitive touch panel, in which FIG. 9A shows the capacitance generated while waiting for an input operation, and FIG. 9B shows the static generated when the input operation is being performed. It is explanatory drawing which compares and shows electric capacity.

  Hereinafter, the capacitive touch panel 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the capacitive touch panel 1 includes an insulating substrate 2 and a plurality of X detection electrodes 3, 3 wired in a matrix on the surface of the insulating substrate 2 along XY directions orthogonal to each other. .., Y detection electrodes 4, 4, .., X ground pattern 5 wired between X detection electrodes 3, 3 adjacent in the X direction, and Y detection electrodes 4, 4 wired in the Y direction. Y ground pattern 6 to be provided.

  In each cross region 1A where the X detection electrode 3 and the Y detection electrode 4 intersect, the Y detection electrode 4 and the Y ground pattern 6 intersecting the X electrode 3 are insulated from each other and the X ground pattern 5 is intersected with the Y detection. An insulating coat 15 (see FIG. 2) is provided to insulate from the electrode 4, whereby the detection electrodes 3 and 4 are insulated from each other and also insulated from the ground patterns 5 and 6. The capacitive touch panel 1 has an input operation position detection for detecting an input operation position by an input operation body such as a finger from the positions of the detection electrodes 3 and 4 where the common mode noise input due to an increase in stray capacitance is increased. Although the circuit 10 is connected, its configuration and operation will be described later.

  The insulating substrate 2 can be composed of various materials such as polyethylene terephthalate (PET) or polyimide flexible plastic sheet as long as the conductive pattern is formed on the surface. The display device arranged on the back side from the input operation surface is configured with a transparent glass substrate so that it can be seen.

  As shown in FIG. 2, the X detection electrodes 3 wired at equal intervals in the X direction on the surface of the insulating substrate 2 cross the trapezoidal X pattern body 3a and the Y detection electrode 4 along the X direction. In the region 1A, the X pattern main body 3a is connected to the X pattern main body 3a in the Y direction, and the X pattern main body 3a connected by the X connection pattern 3b is connected to the cross region 1A. It has a point-symmetric shape around the center.

  The Y detection electrodes 4 wired at equal intervals in the Y direction on the surface of the insulating substrate 2 are continuously formed in the X direction in a shape in which the X detection electrodes 3 are rotated 90 degrees on the insulating substrate 2. . That is, the Y detection electrode 4 includes a trapezoidal Y pattern body 4a along the Y direction, and a narrow strip-shaped Y connection pattern 4b that integrally connects the Y pattern bodies 4a in the X direction at the intersection region 1A. The pair of Y pattern bodies 4a connected by the Y connection pattern 4b has a point-symmetric shape around the center of the intersecting region 1A.

  The X detection electrode 3 and the Y detection electrode 4 can be formed of any conductive material that can be wired on the insulating substrate 2, but here, printing can be performed on the insulating substrate 2 that is a glass substrate, and a transparent conductive material It is made of ITO (Indium Tin Oxide).

  As shown in FIG. 2, a slight gap is formed between the adjacent pattern bodies 3a and 4a, and the gaps between the X detection electrodes 3 and 3 are spaced apart from the pattern bodies 3a and 4a by a predetermined distance. An X ground pattern 5 to be wired and a Y ground pattern 6 to be wired between the Y detection electrodes 4 and 4 are wired. The X ground pattern 5 and the Y ground pattern 6 may be formed of any conductive material. However, the X ground pattern 5 and the Y ground pattern 6 may be formed in the same process as the X detection electrode 3 or the Y detection electrode 4 as follows. It is formed by printing with the conductive material ITO.

  In this embodiment, the Y detection electrode 4 and the Y ground pattern 6 are formed on the insulating substrate 2 in advance, and the Y connection is made in each crossing region 1A where the X detection electrode 3 and the Y detection electrode 4 intersect. An insulating coat 15 made of an insulating material such as silica (SiO 2) is printed on the upper layer so as to straddle the pattern 4 b and the Y ground pattern 6. Thereafter, as shown in the figure, the X detection electrode 3 and the X detection electrode 3 are arranged so that the portion of the X detection pattern 3 that crosses the X connection pattern 3b and the Y connection pattern 4b of the X ground pattern 5 is wired on the insulating coat 15, respectively. The ground pattern 5 is wired over the entire insulating substrate 2. In each intersection region 1A, the portion where the X ground pattern 5 and the Y ground pattern 6 are overlapped is also used as the X ground pattern 5 and the Y ground pattern 6, and the two are electrically connected.

  In the capacitive touch panel 1 manufactured in this way, a plurality of X detection electrodes 3 and a plurality of Y detection electrodes 4 are wired in a matrix on an insulating substrate 2, and an X ground pattern 5 and a Y ground pattern are interposed therebetween. 6 is insulated from the detection electrodes 3 and 4 and wired in a grid pattern. The X ground pattern 5 and the Y ground pattern 6 are respectively grounded, and noise other than the common mode noise from the input operation body approaching from above the detection electrodes 3 and 4 is cut off and grounded to the detection electrodes 3 and 4. Since the ground patterns 5 and 6 are wired, the stray capacitance between the detection electrodes 3 and 4 does not affect the detection of the input operation position.

  As shown in FIG. 1, the input operation position detection circuit 10 is connected to one side of each of the plurality of X detection electrodes 3 and the Y detection electrodes 4, and the other side is grounded. An X-side multiplexer 11 for switching the connection between the diode 8 and the unity gain amplifier 9 connected to the other side of the Y detection electrode 4 and the other side of the unity gain amplifier 9 connected to each X detection electrode 3, and each Y detection A Y-side multiplexer 12 that switches connection to the other side of the unity gain amplifier 9 connected to the electrode 4, an A / D converter 13, and a CPU 14 are included.

  The unity gain amplifier 9 separates the input side circuit on the other side of each X detection electrode 3 and the Y detection electrode 4 clamped to the ground level by the diode 8 and the detection circuit on the output side thereof. The X-side multiplexer 11 and the Y-side multiplexer 12 are connected to the A / D converter 13 by the CPU 14, whereby the capacitance change signal output from the unity gain amplifier 9 that is selectively connected by the CPU 14 is A / D converted. Is input to the device 13.

The A / D converter 13 binarizes the input capacitance change signal and outputs it to the CPU 14. The CPU 14 compares the level of the envelope of the input capacitance change signal with a predetermined voltage threshold V _TH. Thus, the detection electrodes 3 and 4 whose capacitance is increased by the approach of the input operation body and the level of common mode noise input from the finger is increased are detected by the X detection electrode 3 and the Y detection electrode 4 respectively. Then, the input operation position is detected in the XY directions from the arrangement position of the detection electrodes 3 and 4 on the insulating substrate 2.

  The CPU 14 outputs the input operation position thus truly detected to a microcomputer that controls cursor movement control on the display screen and the operation of the electronic device, and executes predetermined processing according to the input operation position.

  The change in the capacitance of the detection electrode due to the input operation is proportional to the area of the capacitance. Therefore, it is necessary to arrange the detection electrode on the limited insulating substrate 2 as efficiently as possible. In the capacitive touch panel 1 according to the first embodiment, a useless portion where the insulating substrate 2 is exposed is left in the intersecting region 1A. The capacitive touch panel 20 according to the second embodiment has a detection electrode that intersects the XY direction without waste on almost all of the insulating substrate 2, and this static touch panel 20 will be described below with reference to FIGS. 3 to 7. The capacitive touch panel 20 will be described. In the second embodiment, the insulating substrate 2 and the input operation position detection circuit 10 are the same as those in the first embodiment, and a description thereof is omitted.

  Similarly to the first embodiment, the capacitive touch panel 20 has a plurality of X detection electrodes 23, 23... And Y detection electrodes 24, 24 along the XY directions orthogonal to each other on the surface of the insulating substrate 2. .. are wired in a matrix, and the Y ground pattern 25, the X detection electrode 23, and the Y detection electrode 24 are wired between the Y detection electrodes 24, 24 adjacent in the Y direction along the Y detection electrode 24. An X ground pattern 26 that connects the Y ground patterns 25 and 25 is wired in each intersecting region 20A.

  As shown in FIG. 6, the X detection electrodes 23 wired at equal intervals in the X direction on the surface of the insulating substrate 2 intersect with the rhombus X pattern body 23a and the Y detection electrode 24 along the Y direction. In the region 20A, the Y detection electrodes 24, which are formed of narrow strip-like X connection patterns 23b that integrally connect the X pattern main bodies 23a in the Y direction, are wired on the surface of the insulating substrate 2 at equal intervals in the Y direction. The rhombus Y pattern main body 24a, which is substantially the same as the X pattern main body 23a, and the narrow band-like Y connection pattern 24b for integrally connecting the Y pattern main bodies 24a in the X direction in the intersecting region 20A. Therefore, the X detection electrode 23 and the Y detection electrode 24 become narrower toward the respective intersecting regions 20A intersecting each other, and the intersecting regions 20A are continuous by the narrow strip-shaped X connection pattern 23b or the Y connection pattern 24b. .

  As in the first embodiment, the detection electrodes 23 and 24 and the ground patterns 25 and 26 wired on the insulating substrate 2 are all made of ITO, which is a transparent conductive material.

  Further, in each intersecting region 20A where the X detection electrode 23 and the Y detection electrode 24 intersect, the X detection electrode 23 is insulated from the Y detection electrode 24 and the Y ground pattern 25, and the X ground pattern 26 is intersected. An insulating coat 27 is provided to insulate from the Y detection electrode 24, so that the detection electrodes 23 and 24 are insulated from each other and from the ground patterns 25 and 26.

  The capacitive touch panel 20 shown in FIG. 6 is formed through the manufacturing steps shown in FIGS. That is, in the first step shown in FIG. 3, as shown in FIG. 3A, an X connection pattern 23b and a pair of X ground patterns 26 on both sides are printed in the Y direction at the position of each intersecting region 20A. It is formed. Each X connection pattern 23b overlaps with the arrangement position of the X pattern main body 23a shown in FIG. 6B on both sides in the Y direction, and the pair of X ground patterns 26 includes the Y connection pattern 24b shown in FIG. 6B. And both sides in the Y direction overlap with the Y ground pattern 25.

  In the second step, the both ends in the Y direction of the X connection pattern 23b and the pair of X ground patterns 26 printed and formed in the first step are left at the positions of the respective intersecting regions 20A, and FIGS. An insulating coat 27 made of an insulating material such as silica (SiO 2) shown in FIG. The insulating coat 27 is wider than the X connection pattern 23b and has a rectangular second coat portion 27A having a width extending over both sides of the Y detection electrode 24 and straddling a pair of Y ground patterns 25, 25, and an X ground. As shown in FIG. 4B, a pair of rectangular first coat portions 27B having a width wider than the pattern 26 and extending over the Y detection electrode 24 are formed in a cross shape.

  Subsequently, in the third step, the X pattern body 23a, the Y detection electrode 24, and the Y ground pattern 25 are overlaid from above to be printed. As shown in FIGS. 5A and 5B, the Y ground pattern 25 is a waveform formed between the Y pattern electrode 23 and the X pattern body 23a along the contour of each Y detection electrode 24 wired along the X direction. Insulated and wired in any gap. In the third step, when the X pattern main body 23a, the Y detection electrode 24, and the Y ground pattern 25 are printed and formed from above, the X connection pattern 23b is intersected with the Y connection pattern 24b intersecting with the Y ground on both sides in each intersecting region 20A. An insulating coat 27 is interposed between the pattern 25 and insulated, and both sides not covered by the insulating coat 27 overlap with the X pattern main body 23a to electrically connect the X pattern main body 23a. Further, the X connection pattern 23b and the pair of X ground patterns 26 on both sides thereof are insulated by interposing an insulating coat 27 between the intersecting Y connection patterns 24b, and both sides of the X connection pattern 23b not covered by the insulation coat 27 are covered. It overlaps with the Y ground pattern 25 and electrically connects the pair of Y ground patterns 25 along the Y detection electrode 24.

  In this way, the capacitive touch panel 20 manufactured through the first to third steps has a plurality of X detection electrodes 23 and a plurality of Y detection electrodes 24 wired in a matrix on the insulating substrate 2, and the X As shown in FIG. 7, the ground pattern 26 and the Y ground pattern 25 are insulated from the detection electrodes 23 and 24 and wired in a mesh pattern. Since the X ground pattern 26 and the Y ground pattern 25 are grounded, noise other than the common mode noise from the input operation body approaching from above the X detection electrodes 23 and 24 is blocked and the detection electrodes 23 and 24 are also blocked. Since the ground pattern 25 that is grounded is wired, the stray capacitance between the detection electrodes 23 and 24 does not affect the detection of the input operation position.

  The process of manufacturing the capacitive touch panel 20 in the second embodiment may be formed in the order of the first process through the third process and the second process.

  In the first and second embodiments described above, the ground pattern 5, 6, 25, 26 having a lattice shape or a mesh shape is wired on the insulating substrate 2 so as to be insulated from the detection electrodes. Although it can be cut off, a shield layer separately grounded may be formed on the back side of the insulating substrate 2 in order to completely block noise from the back side of the insulating substrate 2.

  Further, as described above, the input operation position detecting means for detecting the input operation position from the change in the stray capacitance of the detection electrode is not limited to the method of detecting from the increase of the common mode noise. It may be input from one side of the body or the detection electrode and detected from a change in detection signal due to a change in stray capacitance.

  In the input operation position detection circuit 10 described above, the detection resistor 7 may be connected between the X detection electrode 3 and the Y detection electrode 4 and the diode 8, and the X detection electrode 3 and the Y detection electrode 4 are connected to each other. The unity gain amplifier 9 that separates the input circuit on the other side and the detection circuit on the output side thereof may be replaced by an FET (field effect transistor) whose gate is connected to the input circuit side. Furthermore, if these unity gain amplifiers 9 or FETs are connected between the multiplexers 11 and 12 and the A / D converter 13, it is not necessary to prepare each of the detection electrodes 3 and 4.

  This is suitable for a capacitive touch panel that detects an input operation position in a non-contact manner from a minute change in stray capacitance caused by approaching an input operation body.

1 Capacitive touch panel (first embodiment)
1A Crossing area 2 Insulating substrate 3 X detection electrode 4 Y detection electrode 5 X ground pattern 6 Y ground pattern 15 Insulation coating 20 Capacitive touch panel (second embodiment)
20A Crossing area 23 X detection electrode 24 Y detection electrode 25 Y ground pattern 26 X ground pattern 27 Insulation coating

Claims (5)

A plurality of first electrodes and a plurality of second electrodes wired in a matrix on the insulating substrate along directions orthogonal to each other;
An insulating region that is disposed between the first electrode and the second electrode in an intersecting region where the first electrode and the second electrode intersect, and insulates the intersecting first electrode and the second electrode;
An input for detecting a change in the stray capacitance of each first electrode and each second electrode, and bringing the detected object closer to the insulating substrate from the position of the first electrode and the second electrode on which the stray capacitance has changed on the insulating substrate. A capacitive touch panel that detects an input operation position of an operation,
A plurality of wires that are wired between adjacent first electrodes on the insulating substrate along the wiring direction of the first electrode and are wired to the other side of the second electrode through an insulating coat at the intersection region to be insulated from the second electrode A first ground pattern;
A plurality of wires that are wired along the wiring direction of the second electrode between adjacent second electrodes on the insulating substrate, and are wired to the other side of the first electrode through an insulating coat at the intersection region to be insulated from the first electrode. And a second ground pattern of
The plurality of first ground patterns and the second ground patterns are electrically connected at portions on the insulating substrate that intersect each other. A plurality of first electrodes and a plurality of second electrodes wired in a matrix on the insulating substrate along directions orthogonal to each other;
An insulating region that is disposed between the first electrode and the second electrode in an intersecting region where the first electrode and the second electrode intersect, and insulates the intersecting first electrode and the second electrode;
An input for detecting a change in the stray capacitance of each first electrode and each second electrode, and bringing the detected object closer to the insulating substrate from the position of the first electrode and the second electrode on which the stray capacitance has changed on the insulating substrate. A capacitive touch panel that detects an input operation position of an operation,
Each first electrode has a plurality of rhombus-shaped first pattern bodies that become narrower toward the intersecting region, and a band-like shape that continuously connects the first pattern bodies along the wiring direction of the first electrode in the intersecting region. A first connection pattern;
Each second electrode straddles the plurality of rhombus-shaped second pattern bodies complementary to the first pattern body on the insulating substrate and the first connection pattern in the intersecting region, and the wiring direction of the second electrode between the second pattern bodies And a belt-like second connection pattern connected along
A third ground pattern is wired on both sides of each first electrode along the gap between the contour of the first electrode and the second pattern body,
The first coat part of the insulating coat is bridged across the first connection pattern in the intersecting region, and the second coat part is bridged across the third ground patterns on both sides of the first connection pattern,
Wiring a fourth ground pattern electrically connecting between a pair of third ground patterns wired along both sides of the first electrode to the other side of the first connection pattern across the first coat portion;
A capacitive touch panel, wherein the second connection pattern is wired on the other side of the first connection pattern and the third ground pattern with the second coat portion interposed therebetween. The capacitive touch panel according to claim 2, wherein the first electrode and the third ground pattern and / or the second electrode and the fourth ground pattern are formed of the same conductive material. A first step of forming a first layer comprising a first electrode, a third ground pattern, and a second pattern body in each intersecting region of the insulating substrate;
A second step of forming a second layer composed of a first coat portion and a second coat portion of an insulating coat in each intersection region;
A third step of forming a third layer composed of a second connection pattern and a fourth ground pattern in each intersection region;
The first layer, the second layer, and the third layer are laminated in the order of the first step, the second step, and the third step, or in the order of the third step, the second step, and the first step. The manufacturing method of the capacitive touch panel characterized by manufacturing the capacitive touch panel of Claim 2 which electrically connects each part which opposes. 5. The first electrode of the first layer, the third ground pattern, the second pattern body, and / or the second connection pattern of the third layer and the fourth ground pattern are formed of the same conductive material. The manufacturing method of the capacitive touch panel as described in 2.

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