JP2010113498A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device having a capacitively-coupled touch panel having excellent reliability allowing finger touch input and being excellent in detection sensitivity. <P>SOLUTION: A recess is formed in a front panel and the touch panel is housed in the recess. A transparent conductive film is formed on the backside of the touch panel to shield against noise generated at the display device. Also, a conductive member is provided to supply a voltage to the transparent conductive film on the backside. Electrodes formed on the capacitively-coupled touch panel are divided according to the ratio of the number of X electrodes to the number of Y electrodes, and floating electrodes are formed in gaps that form as area decreases, to thereby adjust the area of the electrodes. The level of noise can be lowered more than the level of signals is lowered because of the reduction in the area of each electrode, thereby S/N ratio can be increased and the detection sensitivity can be enhanced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device with a touch panel, and more particularly to a technique effective when applied to a display device with a touch panel including a capacitively coupled touch panel.

In recent years, touch screen technology supporting a “human friendly” graphical user interface has become important in the spread of mobile devices.
As this touch panel technology, a capacitive coupling type touch panel is known, and as this capacitive coupling type touch panel, one that detects a touch position touched by an observer is known. (See Patent Document 1 below)
The touch panel described in Patent Document 1 below detects the position coordinates touched by the observer by detecting the coupling capacitance between the X-direction electrode line and the Y-direction electrode line.

As prior art documents related to the invention of the present application, there are the following.
Special table 2003-511799 gazette

The capacitively coupled touch panel includes a plurality of Y electrodes extending in a first direction (for example, the Y direction) and provided in a second direction (for example, the X direction) intersecting the first direction, A plurality of X electrodes extending in the second direction intersecting with the Y electrodes and provided side by side in the first direction. Such a touch panel is called an XY touch panel. In an XY touch panel, a plurality of X electrodes and a plurality of Y electrodes are laminated on a substrate via an interlayer insulating film. These X electrode and Y electrode are formed of a transparent conductive material such as ITO (Indium Tin Oxide), for example.
The capacitance of one line of electrodes of the conventional XY touch panel that is not touched with a finger (steady state) is formed by the interelectrode capacitance between adjacent electrodes and the intersection with the orthogonal electrode. Crossover capacitance, ground capacitance between the display device arranged under the touch panel, and wiring capacitance generated in wiring between the control IC and the touch panel.
Since the capacitive coupling type touch panel is a system that detects a change in capacitance caused by a human finger touching the touch panel, it is desired that the capacitance other than the capacitance between electrodes is smaller. When the interelectrode capacitance is larger than other capacitances, the capacitance ratio when touched with a finger or the like can be secured, and the performance of the touch panel is improved. Conversely, if the capacity ratio cannot be ensured, it may be possible that the device does not recognize that it is touched with a finger or the like and malfunctions.

As an index of detection sensitivity of the touch panel, a ratio between a change in capacitance when a finger or the like is touched and a background noise (hereinafter referred to as S / N ratio) is used. In order to increase the detection sensitivity, that is, the S / N ratio, it is necessary to increase the signal or reduce the noise.
On the other hand, a front panel is formed on the side of the touch panel where a finger or the like is touched for the purpose of protecting the surface. In order to increase the detection sensitivity, it is advantageous in terms of characteristics that the front panel is thin. However, it is disadvantageous to reduce the thickness of the front panel in terms of strength.
As described above, the signal level is proportional to the capacitance formed between the finger or the like touching the touch panel and the electrode. On the other hand, when the wiring capacitance or the like increases, the capacitance change when touched by a finger or the like becomes relatively small and the S / N ratio deteriorates.
In addition, regarding background noise, it was found that the electrode of the touch panel located immediately above detects fluctuations in the signal voltage generated for display by the display device as noise. The larger the total electrode area on one electrode line of the touch panel, the larger the ground capacitance, so that it is easier to detect noise. However, when the electrode area is reduced, the capacitance between the electrodes is also reduced and the signal level is lowered.
Therefore, in order to suppress the influence of noise generated from the display device without lowering the signal level, first, it was considered to install a transparent conductive film as a shield layer on the back surface of the touch panel substrate. However, in order to form a transparent conductive film on the back surface of the substrate and use it as a shield layer, it is necessary to supply a voltage to the back surface of the substrate.
In addition, as a signal supply method for improving the S / N ratio, an attempt was made to connect to the wiring at both ends of the X electrode and the Y electrode of the touch panel, and the signal from the control IC was sent to each of the X electrode and the Y electrode. It was found that supplying from both ends of the film was good for improving the S / N ratio. However, since a signal is supplied from both ends of the electrode, the wiring from the control IC to the touch panel is extended to the left and right and formed to intersect with other wiring, which causes a new problem that the wiring capacity increases. Also occurred.

There is also a problem caused by the outer shape of the touch panel. The outer shape of the touch panel that is used while being overlapped with the display device is substantially the same as that of the display device. The display device is generally rectangular, and generally, either the X direction or the Y direction is long.
In the prior art, the individual electrodes on each line in the X direction and the Y direction have the same size, but the length of one line differs between the electrodes in the X direction and the electrodes in the Y direction, and the number of individual electrodes is different. Therefore, the capacity of one line differs between the X direction and the Y direction. As an example, in the case of a vertically long touch panel, the capacity of one line of Y electrodes arranged in parallel in the long side direction is larger than the capacity of one line of X electrodes arranged in parallel in the short side direction.
Therefore, in the conventional touch panel in which the capacitance on one electrode line is different between the X direction and the Y direction, the noise intensity is different between the X direction and the Y direction. That is, in the conventional touch panel, the S / N ratio differs between the X direction and the Y direction. Due to the difference in S / N ratio, there is a problem that the detection sensitivity of the entire touch panel is defined by the lower S / N ratio.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a capacitive coupling type touch panel that is capable of finger touch input and has high reliability and excellent detection sensitivity. It is to provide an attached display device.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
In order to improve the S / N ratio, the front panel is provided with a recess, and a finger or the like is in close contact with the electrode part. Further, by providing the front panel with a recess, the front panel is not only thinned, The peripheral part has a sufficient thickness to ensure strength.
In order to improve the S / N ratio, a shield electrode is formed on the back surface of the XY touch panel, and a connection terminal for the back surface is provided to supply a constant voltage to the shield electrode on the back surface. The connection terminal for use was connected with a conductive member.
Furthermore, in order to solve the problem that the wiring crosses on the flexible substrate and the wiring capacity increases because the signal is supplied from both ends of the XY electrode, the wiring connected from the output of the control IC to the electrode on the touch panel The portion has a structure in which no wiring including the ground potential portion is disposed on the back surface thereof. In addition, in the portion where the wiring crossing of the flexible substrate is required, the crossing area is minimized by crossing the wirings to prevent an increase in wiring capacity.
Furthermore, the area of the Y electrode that runs parallel to the long side of the touch panel is reduced and smaller than the area of the other X electrode that is orthogonal to each other, and the capacitance on the electrode 1 line in the X and Y directions is the same. It was made to become. In addition, a floating electrode (dummy electrode) was disposed in a portion that was vacated by area reduction.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the display apparatus with a touch panel of the capacitive coupling method of the reliable and excellent detection sensitivity which can perform finger touch input.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
In this embodiment, a liquid crystal display panel will be described as an example of a display panel. The display panel is not limited to a liquid crystal display panel as long as it can use a touch panel, and an organic light-emitting diode element or a surface conduction electron-emitting element can also be used.
FIG. 1 is a plan view showing a schematic configuration of a display device with a touch panel according to an embodiment of the present invention. 2 is a cross-sectional view showing a cross-sectional structure taken along the line AA ′ of FIG.
As shown in FIGS. 1 and 2, the display device 300 of the present embodiment includes a liquid crystal display panel 600, a capacitively coupled touch panel 400 disposed on the surface of the liquid crystal display panel 600 on the viewer side, A backlight 700 is provided below the surface of the liquid crystal display panel 600 opposite to the viewer side. As the liquid crystal display panel 600, for example, a liquid crystal display panel of an IPS method, a TN method, a VA method, or the like is used.
The liquid crystal display panel 600 is formed by bonding two substrates 620 and 630 arranged to face each other, and polarizing plates 601 and 602 are provided outside the two substrates. Further, the liquid crystal display panel 600 and the touch panel 400 are joined by a first adhesive 501 made of a resin / adhesive film or the like.
Further, a front protective plate (also called a front window or front panel) 12 made of acrylic resin or glass is bonded to the outside of the touch panel 400 by a second adhesive material 502 made of a resin / adhesive film or the like.
The front protective plate 12 is provided with a recess 612, and the thickness of the front protective plate 12 is thin in a region overlapping the touch panel 400 and thick in the peripheral portion. Thus, in this embodiment, the detection sensitivity is increased and the strength of the front protective plate 12 is ensured.
A transparent conductive layer 603 made of ITO is provided on the liquid crystal display panel side of the touch panel 400. The transparent conductive layer 603 is formed for the purpose of shielding a signal generated in the liquid crystal display panel 600.

The liquid crystal display panel 600 is provided with a large number of electrodes, and a voltage is applied to the electrodes as signals at various timings. The change in voltage in the liquid crystal display panel 600 becomes noise for the electrodes provided on the capacitively coupled touch panel 400.
Therefore, it is necessary to electrically shield the touch panel 400 from the liquid crystal display panel 600, and the transparent conductive layer 603 is provided as a shield electrode. In order to function as a shield electrode, a constant voltage is supplied to the transparent conductive layer 603 from the flexible printed circuit board 71 or the like, for example, a ground potential.
The flexible printed circuit board 71 is connected to a connection terminal (not shown) formed on the surface (hereinafter referred to as the front surface) on which the electrodes of the touch panel 400 are formed, but the surface on which the transparent conductive layer 603 is provided (hereinafter referred to as the back surface). A conductive member 80 is provided to supply a voltage such as a ground potential.
Note that the transparent conductive layer 603 desirably has a sheet resistance value of 150 to 200 Ω / □, which is about the same as that of an electrode provided on the touch panel 400, in order to suppress the influence of noise. The resistance value of the transparent conductive layer 603 made of ITO is known to be related to the size of the crystal grains, but crystallization can be achieved by setting the heat treatment temperature at the time of forming the transparent conductive layer 603 to 200 ° C. or higher. It is possible to advance the sheet resistance value to 150 to 200Ω / □.
Further, a transparent conductive layer 603 having a lower resistance can be used. For example, by setting the heat treatment temperature to 450 ° C. and sufficiently crystallizing the transparent conductive layer 603, the sheet resistance value can be set to 30 to 40Ω / □.

If the transparent conductive layer 603 for shielding is comparable to or lower in resistance than the electrode provided on the touch panel 400, the effect of suppressing noise is improved.
The flexible printed circuit board 71 is connected to a touch panel control circuit (not shown), and detection of an input position and the like are controlled by the touch panel control circuit. The electrodes provided on the front surface of the touch panel 400 and the touch panel control circuit are electrically connected via the flexible printed circuit board 71. In addition, an arbitrary voltage such as a ground potential is supplied to the transparent conductive layer 603 provided on the back surface via the flexible printed circuit board 71.
Since the flexible printed circuit board 71 is connected to an input terminal provided on the front surface of the touch panel 400, it is necessary to provide a wiring from the input terminal to the transparent conductive layer 603 provided on the back surface to be electrically connected. Therefore, a back connection pad is provided in line with the input terminal, and the back connection pad and the transparent conductive layer 603 on the back are connected by the conductive member 80. Details of the back surface connection pad will be described later.
As shown in FIG. 2, in this embodiment, the spacer 30 is inserted between the substrate 620 and the touch panel 400.
In the hybrid structure in which the touch panel 400 and the front window 12 are combined with the liquid crystal display panel 600, there is a problem that the glass strength of the substrate 620 of the liquid crystal display panel 600 is weak.
In the substrate 620, a region where the drive circuit 50 is mounted protrudes from the other substrate 630 and has a single plate shape. There is a case where the substrate 620 is damaged in the mounting area of the drive circuit 50. Therefore, the spacer 30 is inserted between the substrate 620 and the touch panel 400 to improve the strength.

Next, the liquid crystal display panel 600 will be described with reference to FIG. FIG. 3 is a block diagram showing a basic configuration of the liquid crystal display panel 600. However, in FIG. 3, the touch panel 400 is omitted for explaining the liquid crystal display panel 600.
As described above, the liquid crystal display device includes the liquid crystal display panel 600, the drive circuit 50, the flexible printed circuit board 72, and the backlight 700. A drive circuit 50 is provided on one side of the liquid crystal display panel 600, and various signals are supplied to the liquid crystal display panel 600 by the drive circuit 50. The liquid crystal display panel 600 is electrically connected to a flexible printed circuit board 72 for supplying an external signal to the drive circuit 50.
The liquid crystal display panel 600 includes a substrate 620 (hereinafter also referred to as a TFT substrate) on which a thin film transistor 610, a pixel electrode 611, a counter electrode (common electrode) 615 and the like are formed, and a substrate 630 (hereinafter referred to as a filter) on which a color filter and the like are formed. Are also stacked with a predetermined gap therebetween, and both substrates are bonded together by a sealing material (not shown) provided in the shape of a frame in the vicinity of the peripheral edge between the two substrates. A liquid crystal composition is sealed and sealed, and polarizing plates 601 and 602 (see FIG. 2) are attached to the outside of both substrates, and a flexible printed circuit board 72 is connected to the TFT substrate 620.
Note that this embodiment similarly applies to a so-called horizontal electric field type liquid crystal display panel in which the counter electrode 615 is provided on the TFT substrate 620 and to a so-called vertical electric field type liquid crystal display panel in which the counter electrode 615 is provided on the filter substrate 630. Applied.

In FIG. 3, a scanning signal line (also referred to as a gate signal line) 621 extending in the x direction and arranged in parallel in the y direction, and a video signal line extending in the y direction and arranged in parallel in the x direction (in FIG. 3). 622), and a pixel portion 608 is formed in a region surrounded by the scanning signal line 621 and the drain signal line 622.
Note that although the liquid crystal display panel 600 includes a large number of pixel portions 608 in a matrix, only one pixel portion 608 is shown in FIG. 3 for easy understanding. The pixel portions 608 arranged in a matrix form a display region 609, and each pixel portion 608 plays a role of a pixel of a display image and displays an image in the display region 609.
The thin film transistor 610 of each pixel portion 608 has a source connected to the pixel electrode 611, a drain connected to the video signal line 622, and a gate connected to the scanning signal line 621. The thin film transistor 610 functions as a switch for supplying a display voltage (gradation voltage) to the pixel electrode 611.
Note that although the names of the source and the drain may be reversed due to a bias relationship, the one connected to the video signal line 622 is referred to as a drain here. Further, a liquid crystal capacitor is formed between the pixel electrode 611 and the counter electrode 615.
The drive circuit 50 is disposed on a transparent insulating substrate (glass substrate, resin substrate, etc.) constituting the TFT substrate 620. The drive circuit 50 is connected to the scanning signal line 621, the video signal line 622, and the counter electrode signal line 625.

A flexible printed circuit board 72 is connected to the TFT substrate 620. The flexible printed circuit board 72 is provided with a connector 640. The connector 640 is connected to an external signal line and receives an external signal. A wiring 631 is provided between the connector 640 and the drive circuit 50, and an external signal is input to the drive circuit 50.
The flexible printed circuit board 72 supplies a constant voltage to the backlight 700. The backlight 700 is used as a light source for the liquid crystal display panel 600. Note that the backlight 700 is provided on the back surface or the front surface of the liquid crystal display panel 600, but in FIG. 3, the backlight 700 is displayed side by side with the liquid crystal display panel 600 for the sake of simplicity.
A control signal sent from a control device (not shown) provided outside the liquid crystal display panel 600 and a power supply voltage supplied from an external power supply circuit (not shown) are driven via the connector 640 and the wiring 631. Input to the circuit 50.
Signals input to the driving circuit 50 from the outside are control signals such as a clock signal, a display timing signal, a horizontal synchronizing signal, a vertical synchronizing signal, display data (R, G, B), and a display mode control command. The drive circuit 50 drives the liquid crystal display panel 600 based on the input signal.
The drive circuit 50 is composed of a one-chip semiconductor integrated circuit (LSI), and outputs a scanning signal output circuit to the scanning signal line 621, a video signal output circuit to the video signal line 622, and a counter electrode signal line 625. And an output circuit for outputting a common electrode voltage (common voltage).

The driving circuit 50 sequentially supplies a “High” level selection voltage (scanning signal) to each scanning signal line 621 of the liquid crystal display panel 600 every horizontal scanning time based on a reference clock generated inside. Accordingly, the plurality of thin film transistors 610 connected to each scanning signal line 621 of the liquid crystal display panel 1 electrically conducts the video signal line 622 and the pixel electrode 611 during one horizontal scanning period.
Further, the driving circuit 50 outputs a gradation voltage corresponding to the gradation to be displayed by the pixel to the video signal line 622. When the thin film transistor 610 is turned on (conductive), a gradation voltage (video signal) is supplied from the video signal line 622 to the pixel electrode 611. After that, when the thin film transistor 610 is turned off, the gradation voltage based on the image to be displayed by the pixel is held in the pixel electrode 611.
A constant counter electrode voltage is applied to the counter electrode 615, and the liquid crystal display panel 600 changes the orientation direction of the liquid crystal molecules sandwiched between the pixel electrode 611 and the counter electrode 615 due to the potential difference between the pixel electrode 611 and the counter electrode 615. An image is displayed by changing the transmittance or reflectance of the image.
In addition, the drive circuit 50 performs common inversion driving for outputting a counter electrode voltage whose polarity is inverted every certain period to the counter electrode signal line 625 in order to perform AC driving.
As described above, a change in a signal for driving the liquid crystal display panel 600 is detected by the touch panel 400 as noise. Therefore, it was necessary to take measures. In particular, the touch panel 400 has a property of prompting the user to input based on an image displayed on the liquid crystal display panel 600, and needs to be provided so as to overlap with a display device such as the liquid crystal display panel 600. It is strongly influenced by noise generated by the display device.

Next, FIG. 4 shows a schematic diagram of the touch panel 400. This embodiment shows a case where the touch panel 400 is used vertically. Note that the outer shape of the touch panel used to overlap the display panel is substantially the same as that of the display panel. The display panel is generally rectangular, and generally, either the X direction or the Y direction is long.
In FIG. 4, it is assumed that the liquid crystal display panel 600 used to overlap the touch panel 400 also has a vertically long shape.
Touch panel 400 uses glass substrate 5 as a transparent substrate, touch panel electrodes 1 and 2, connection terminal 7, and touch panel electrodes 1 and 2 on one surface (also referred to as the front surface) of glass substrate 5. Wiring 6 up to 7 and a back surface connection pad 81 are arranged. At least the intersecting portion of the two kinds of electrodes arranged so as to be orthogonal is separated by an insulating film. It is also possible to use a transparent resin substrate instead of the glass substrate 5.
The touch panel electrodes 1 and 2 are formed of a transparent conductive film made of ITO, and an electrode extending in the vertical direction (Y direction in the figure) and arranged in parallel in the horizontal direction (X direction) is referred to as a Y electrode 1. An electrode extending in the horizontal direction (X direction) so as to cross the Y electrode 1 and formed in parallel in the vertical direction (Y direction) is referred to as an X electrode 2. A change in electrostatic capacitance of the Y electrode 1 and the X electrode 2 is detected, and the touched position is calculated. A detectable area inside the dotted line indicated by reference numeral 3 is called an input area.
Signals are supplied from both ends to the Y electrode 1 and the X electrode 2 provided on the touch panel 400, and the detection accuracy of the signals is increased. That is, in the case where a change in capacitance is detected by supplying a charge to each Y electrode 1 and X electrode 2 and measuring the time to reach a certain voltage, the charge is supplied from both ends of the electrode, thereby reducing the wiring resistance. It is possible to suppress the measurement error that occurs.
Therefore, the wiring 6 is formed on the outer periphery of the input area 3 and connected to the connection terminal 7 formed in parallel with one side of the touch panel 400. A back surface connection pad 81 is provided along with the connection terminal 7 and is electrically connected to a transparent conductive layer 603 provided on the back surface of the glass substrate 5 via a conductive member 80 described later.
In addition to the connection terminal 7, a back connection terminal 82 and a dummy connection terminal 83 are provided. Further, the back connection pad 81 is formed to have a larger area than the connection terminal 7, and the connection work of the conductive member 80 is facilitated. Further, by providing the dummy connection terminal 83, it is possible to prevent a short circuit between the terminals. Reference numeral 84 denotes a wiring for electrically connecting the back surface connection terminal 82 and the back surface connection pad 81 and can be formed in the same process as the other wiring 6.

Next, each Y electrode 1 and X electrode 2 will be described. Both the Y electrode 1 and the X electrode 2 are narrow at the intersections 1a and 2a, and are wide at the electrode parts 1b and 2b sandwiched between the two intersections 1a or 2a. The electrode portions 1b and 2b sandwiched between the intersecting portions 1a or 2a are also referred to as individual electrodes.
In FIG. 4, the width of the individual electrode 1b of the Y electrode 1 of the touch panel 400 is decreased. That is, the area of the Y electrode 1 is reduced to correspond to the ratio of the number of individual electrodes 2b of the X electrode 2 to the number of individual electrodes 1b of the Y electrode 1, and the individual electrode 1a and the floating potential electrode (Dummy electrode) 4 is separated.
Therefore, the area of the Y electrode 1 whose electrode area has been increased according to the vertically long shape is reduced to make the capacitance on one line substantially equal to that of the X electrode 2, and due to fluctuations in the signal voltage generated from the liquid crystal display panel 600. Noise was made equal between the Y electrode 1 and the X electrode 2.
As described above, the transparent conductive layer 603 is provided on the back surface of the touch panel 400 to suppress the influence of noise from the liquid crystal display panel 600. However, even when the transparent conductive layer 603 is provided, the influence of noise from the liquid crystal display panel 600 may become a problem.
In the prior art, the individual electrodes on each line in the X direction and the Y direction have the same size, but the length of one line differs between the electrodes in the X direction and the electrodes in the Y direction. Different. Therefore, the capacity of one line differs between the X direction and the Y direction. For example, in the case of a vertically long touch panel, the capacity of one line of the Y electrode arranged parallel to the Y direction is larger than the capacity of one line of the X electrode arranged parallel to the X direction.
Therefore, in the conventional touch panel in which the capacitance on one electrode line is different between the X direction and the Y direction, the noise intensity is different between the X direction and the Y direction. That is, in the conventional touch panel, the S / N ratio differs between the X direction and the Y direction. Due to the difference in S / N ratio, there is a problem that the detection sensitivity of the entire touch panel is defined by the lower S / N ratio.
In this embodiment, it is possible to solve the above problems and provide an input device having a large S / N ratio and good detection sensitivity. When the area is reduced by dividing the individual electrode 1b and the floating electrode 4 is formed, the ground capacity can be reduced, so that the noise level can be lowered.

In the electrode shown in FIG. 4, when the floating electrode 4 is not disposed, the interval 8 between the adjacent Y electrode 1 and X electrode 2 becomes wide. As described above, the Y electrode 1 and the X electrode 2 are formed of a transparent conductive film. In this interval 8, an insulating film and a glass substrate are formed, and there is no transparent conductive film. With respect to the transmittance, the reflectance, and the chromaticity of the reflected light, a difference occurs between the portion where the transparent conductive film is present and the portion where the transparent conductive film is not present, so that the interval 8 is visible to the naked eye, thereby reducing the quality of the displayed image.
In our study, when the interval 8 is 30 μm, the interval appears thin, and when it is 20 μm, it is almost invisible. Also, the result was invisible at 10 μm. As the interval 8 is narrowed, the capacitance between the Y electrode 1 and the X electrode 2 adjacent to each other via the floating electrode 4 increases. In addition, by narrowing the interval 8, the defect that the Y electrode 1 or the X electrode 2 and the floating electrode 4 are short-circuited due to pattern formation abnormality due to adhesion of foreign matters during the process increases.
When the floating electrode 4 adjacent to the individual electrode 1b of the Y electrode 1 is short-circuited, the ground capacity for the corresponding one line of the Y electrode increases, noise increases, and the detection sensitivity decreases. The floating electrode 4 is divided into four parts as shown in FIG. 4 in order to reduce the increased capacitance when short-circuited. When more finely subdivided, the concern about short-circuit defects is reduced, but since there are more areas without transparent conductive film in the corresponding area, there is a concern that differences in transmittance, reflectance, and chromaticity with adjacent electrodes may occur and increase. is there. Therefore, as described above, the floating electrode 4 is divided into four parts, and the distance between the electrodes is set to about 20 μm narrower than 30 μm.
In this embodiment, the case where the liquid crystal display panel 600 is used while being stacked on the vertically long liquid crystal display panel 600 is shown, but the effect of the present invention is not changed even when the liquid crystal display apparatus is stacked horizontally or on another type of image display apparatus. Further, the number of divisions of the floating electrode is not limited to four divisions.

Next, FIG. 5 shows a touch panel 400 in which a flexible printed circuit board 71 is attached with an anisotropic conductive film or the like. The flexible printed board 71 is electrically connected to the connection terminal 7 of the touch panel 400 and supplies various signals output from a control circuit (not shown) to the touch panel 400.
First, a signal output from the control circuit is transmitted to the wiring 73 provided on the flexible printed circuit board 71 via the external device side input / output terminal 74. A through hole 78 is formed in the wiring 73 and is connected to a cross wiring 77 provided on the back surface.
The cross wiring 77 crosses many wirings 73 and is connected to the wiring 73 again through a through hole 78 formed at the other end. The cross wiring 77 and the wiring 73 are orthogonal to each other so that the overlapping area is as small as possible. That is, the intersection wiring 77 is formed along the X direction, and the wiring 73 is formed along the Y direction at the intersection. The cross wiring 77 is provided so as not to cross the power supply wiring 73-3 including the ground potential.
Note that the wiring 73-3 supplies a ground potential (GND) to the transparent conductive layer 603 on the back surface for the purpose of shielding. The wiring 73-3 and the back connection terminal 82 are electrically connected via the wiring 84, the back connection pad 81, and the conductive member 80. Further, since the wiring 73-3 is formed so as to surround the other wiring 73, there is also an effect of shielding the other wiring 73.

Signals are supplied from both ends to the Y electrode 1 and the X electrode 2 provided on the touch panel 400, and the detection accuracy of the signals is increased. That is, in the case where a change in capacitance is detected by supplying a charge to each Y electrode 1 and X electrode 2 and measuring the time to reach a certain voltage, the charge is supplied from both ends of the electrode, thereby reducing the wiring resistance. It is possible to suppress the measurement error that occurs.
Therefore, as shown in the X electrodes 2-1 and 2-2 in FIG. 5, the wiring 6-1 is connected to the X electrode 2-1 from the right side in the figure, and the wiring 6-2 is connected to the X electrode 2- from the left side in the figure. 2 is connected. Similarly, the Y electrode 1 is also connected to the wiring 6 at both upper and lower ends.
A touch panel side input / output terminal 79 is formed on the flexible printed circuit board 71 and is connected to the connection terminal 7 formed on the front surface of the touch panel 400. The connection terminal 7 is connected to the wiring 6, and the wiring 6 is formed on the outer periphery of the input region 3 so as to supply signals from both ends of the Y electrode 1 and the X electrode 2.
As described above, in order to supply signals from both ends of the Y electrode 1 and the X electrode 2, it is necessary to branch and supply signals output from the control circuit to the two end portions. The signal can be supplied from both ends of the Y electrode 1 and the X electrode 2 by branching to -1 and 73-2.

Furthermore, since the branched wiring intersects with other wiring, the intersecting wiring 77 is formed on the back surface of the flexible printed circuit board 71 and connected to the wiring 73 via the through hole 78. That is, the through hole 78 has a role of connecting to the cross wiring 77 on the back surface and a role of branching the signal. Since the signal branches on the flexible printed circuit board 71, the number of wires supplied with signals on the touch panel 400 side is increased with respect to the number of wires supplied with signals on the external device side input / output terminal 74 side. Therefore, dummy terminals 76 are formed between the external device side input / output terminals 74. A dummy terminal 75 is also provided outside the external device side input / output terminal 74 in order to improve connection reliability.
The configuration in which signals are supplied from both ends of the Y electrode 1 and the X electrode 2 causes a particular problem that the wiring intersects, but in particular, when the connection terminal 7 is formed on the short side, The Y electrode 1 extending in the direction (Y direction in the figure) and arranged in parallel in the horizontal direction (X direction) has the wiring 6 connected to the wiring 6-b near the center of the touch panel 400 and the wiring 6-a near the outer edge. The Rukoto.
Therefore, on the flexible printed circuit board 71, the cross wiring 77 that connects the wiring 6-b and the wiring 6-a crosses many other wirings 73. Therefore, the wiring capacity of the Y electrode 1 is larger than the wiring capacity of the X electrode 2. As described above, the Y electrode 1 has the problem that the area of the electrode increases according to the vertically long shape, and is more susceptible to noise than the X electrode 2. Therefore, when the connection terminal 7 is formed on the short side, the area of the Y electrode 1 is reduced, the capacitance on one line is made substantially equal to the X electrode 2, and the signal voltage generated from the liquid crystal display panel 600 is reduced. A configuration in which noise due to fluctuations is equivalent between the Y electrode 1 and the X electrode 2 is effective.
Further, although a transparent conductive layer 603 is provided on the back surface of the glass substrate 5 as a noise countermeasure, a voltage such as a ground potential supplied via the flexible printed circuit board 71 is supplied via the back surface connection terminal 82 and the wiring 84. The back surface connection pad 81 is supplied.

Next, the front panel 12 will be described with reference to FIG. FIG. 6 is a schematic perspective view of the front panel 12 as viewed from the touch panel 400 side. The front panel 12 is formed with a recess 612 so that the touch panel 400 can be accommodated. Further, the peripheral portion 614 is formed thicker than the concave portion 612, and the peripheral portion 614 ensures sufficient strength. Further, a groove 613 is formed in a part of the peripheral portion 614 so that the flexible printed circuit board 71 can extend outward from the recess 612.
The recess 612 provided in the front panel 12 can be formed by cutting the front panel 12. In addition, the thicker the peripheral portion 614 of the front panel 12 fixed to the housing or the like, the stronger the strength of the device dropping, etc., and 0.7 mm to 1.0 mm for acrylic and 0.5 mm to 1.0 mm for glass. desirable.
However, for the touch panel 400, it is desirable to reduce the thickness of the concave portion 612 in the case of acrylic, since the sensitivity when operating with a finger is lowered if the thickness on the operation surface is thick. In this case, 0.8 mm or less is desirable.

Next, FIG. 7 shows how the transparent conductive layer 603 and the back surface connection pad 81 are connected. FIG. 7A is a schematic plan view of the touch panel 400, and FIG. 7B is a schematic side view thereof. In FIG. 7, the connection between the transparent conductive layer 603 and the back surface connection pad 81 is illustrated in a simplified manner. The touch panel 400 has an input region 3 formed on the front surface of the glass substrate 5. Further, a back connection terminal 82 is formed on the front surface, and the back connection terminal 82 is connected to a flexible printed circuit board 71 (not shown). The connection between the back connection terminal 82 and the back connection pad 81 is connected via a wiring 84. The wiring 84 is formed integrally with the back surface connection terminal 82 and the back surface connection pad 81.
The back surface connection pad 81 and the transparent conductive layer 603 are connected as a conductive member 80 via a conductive tape (hereinafter, the conductive tape is also indicated by reference numeral 80). The conductive tape 80 has a wiring formed of a copper foil on a resinous base material, and an anisotropic conductive film including conductive beads having a particle diameter of 4 μm is attached to one side of the copper foil. One end of the conductive tape 80 is attached to the back surface connection pad 81 and the other end is attached to the transparent conductive layer 603. After pasting, the conductive tape 80 is heat-bonded by hot tweezers or the like. In FIG. 7, the conductive tape 80 is connected at two places on the left and right sides of the side of the touch panel 400 where the connection terminals 7 are provided.
The cost can be reduced by using a conductive tape 80 that is less expensive than a flexible printed circuit board and heat-pressing it with hot tweezers, which is a general tool. Further, in the work using hot tweezers, it is not necessary to turn the touch panel 400 upside down when pressing the back surface, and the possibility of damaging or soiling the electrode surface of the touch panel 400 can be reduced.

A back surface connection pad 81-2 is also provided on the side opposite to the side where the connection terminal 7 of the touch panel 400 is provided in FIG. The transparent conductive film has a higher specific resistance than a general metal. Therefore, in FIG. 8, the potential of the transparent conductive layer 603 on the back surface can be made uniform by adding the back surface connection pad 81 on the opposite side of the substrate on the side where the connection terminals 7 are provided.
In FIG. 8, the back surface connection terminal 82-1 with respect to the back surface connection pad 81-1 at the corner of the side on which the connection terminal 7 is provided, and the back surface connection pad on the opposite side to the side on which the connection terminal 7 is provided. Although described separately from the back surface connection terminal 82-2 for 81-2, the same effect can be obtained even if the wiring pattern 84 on the glass is connected. The wiring pattern 84 is formed of a multilayer of a transparent conductive film and a metal film, and the wiring resistance is lowered as compared with the case of a single layer of the transparent conductive film.

Next, FIG. 9 shows a state in which the touch panel 400 is laminated with a display device using the metal frame 750 and the front panel 12 is bonded and fixed to the mold frame 755. The transparent conductive layer 603 provided on the back surface of the touch panel 400 is connected to the metal frame with an anisotropic conductive tape 760 using a conductive resin or conductive beads. Application of a voltage signal to the transparent conductive layer 603 on the back surface of the touch panel 400 is performed through a metal frame 750 of the display device. For this reason, a voltage can be applied to the transparent conductive layer 603 without using a dedicated pattern or member for connecting the front and back of the touch panel. It is to be noted that the same effect can be obtained by connecting the connection pad on the display device substrate or the pattern on the flexible printed circuit board on the display device side with a conductive resin or the like instead of the metal frame 750.
A transparent conductive layer 780 formed on the liquid crystal display panel side is connected to the metal frame 750 with a conductive resin 770 or the like. By providing the transparent conductive layer 603 on the back surface of the touch panel 400 and further providing the transparent conductive layer 780 on the liquid crystal display panel side, the shielding effect is improved.
A mold frame 755 is provided so as to surround the outer periphery of the metal frame 750, and the outer peripheral portion 614 of the front panel 12 is fixed to the mold frame 755 with an adhesive 756 such as a double-sided tape. The outer peripheral portion 614 is formed thicker than the concave portion 612, and the strength is maintained in terms of fixing.

Next, the manufacturing method of the touch panel by this invention is demonstrated using FIGS. 10-14. FIG. 4A is a schematic cross-sectional view of each process step along the line BB ′ in FIG. Similarly, a schematic cross-sectional view of each process step along the line CC ′ in FIG. 4 is shown in FIG.
First, the first step will be described with reference to FIG. In the step shown in FIG. 10, after a first ITO film (Indium Tin Oxide) is formed on the glass substrate 5 to a thickness of about 15 nm, a silver alloy is formed to a thickness of about 200 nm.
A resist pattern is formed by a photolithography process, and the silver alloy film is patterned. Next, the resist is peeled and removed, a resist pattern is formed by a photolithography process, and the first ITO film is patterned.
Thereafter, the resist is peeled and removed to form a patterned ITO film 14 and silver alloy film 15 as shown in FIG.
Since the silver alloy film 15 is opaque, the silver alloy film 15 is formed only on the peripheral wiring 6 by removing from the portion of the liquid crystal display panel 600 to be overlapped later to avoid being visually recognized.
Next, a 2nd process is demonstrated using FIG. A photosensitive interlayer insulating film 16 is applied on a substrate on which a pattern of the first ITO film 14 and the silver alloy film 15 is formed, and is patterned by a photolithography technique. As the interlayer insulating film 16, it is desirable to apply a film having SiO ₂ as a main component to a thickness of 1 μm or more. As shown in FIG. 11B, a contact hole 17 is provided in the peripheral portion. Further, the interlayer insulating film 16 is removed from the connection portion 7 used for connection with the external drive circuit.

Next, a 3rd process is demonstrated using FIG. A second ITO film is formed to a thickness of about 30 nm, a resist pattern is formed by a photolithography process, and the second ITO film is patterned. Thereafter, the resist is peeled off and a second ITO film 18 is formed as shown in FIG.
Next, a 4th process is demonstrated using FIG. The same film as the insulating film used in the second step is applied again on the substrate as the uppermost protective film 19. A pattern is formed on the uppermost protective film 19 by a photolithography process.
Next, the fifth step will be described with reference to FIG. In the fifth step, an ITO film is formed as the transparent conductive layer 603 on the back surface of the glass substrate 5. At this time, a mask is formed on the periphery of the front surface of the glass substrate 5. When forming the ITO film on the back surface, there is a risk that the ITO will go around the edge of the glass substrate 5 and adhere to the front surface side. Therefore, it is necessary to protect the peripheral part of the front surface of the glass substrate 5 with a mask. The touch panel 400 is formed through the above steps.
In addition, as a transparent conductive layer 603 formed on the back surface of the glass substrate 5, instead of the ITO film, a conductive and transparent material such as a PET film with ITO may be used.

Next, a modification of the touch panel according to the embodiment of the present invention will be described with reference to FIGS. 15 is a plan view showing a schematic configuration of a modified example of the touch panel according to the embodiment of the present invention. FIG. 16 is a cross-sectional view showing a cross-sectional structure along the line AA ′ in FIG. FIG. 16 is a cross-sectional view showing a cross-sectional structure along the line BB ′ in FIG. 15.
Also in the touch panel 400 illustrated in FIG. 15, the first touch panel 400 extends in the first direction (for example, the X direction) and is arranged in parallel at a predetermined arrangement pitch in the second direction (for example, the Y direction) that intersects the first direction. A plurality of X electrodes 2 and a plurality of Y electrodes 1 extending in the second direction crossing the X electrodes 2 and arranged in parallel in the first direction at a predetermined arrangement pitch. Yes.
Each of the plurality of X electrodes 2 includes an intersecting portion 2a and an electrode portion 2b having a width wider than the width of the intersecting portion 2a. Each of the plurality of X electrodes 2 is disposed on an observer-side surface of the glass substrate 5 via an interlayer insulating film 16, and is covered with an uppermost protective film 19 formed thereon. Instead of the glass substrate 5, for example, a transparent insulating substrate may be used.
Each of the plurality of Y electrodes 1 includes an intersecting portion 1a and an electrode portion 1b having a width wider than the width of the intersecting portion 1a. Each electrode portion 1 b of the plurality of Y electrodes 1 is formed in the same layer as the X electrode 2 and separated from the X electrode 2. That is, each of the electrode portions 1b of the plurality of Y electrodes 1 is disposed on the surface on the viewer side of the glass substrate 5 with the interlayer insulating film 16 therebetween, like the X electrode 2, and is the uppermost layer formed on the upper layer. The upper protective film 19 is covered.
Each intersecting portion 1a of the plurality of Y electrodes 1 is disposed on the surface on the viewer side of the glass substrate 5, and is covered with an interlayer insulating film 16 formed as an upper layer thereof. The intersecting portion 1a of the Y electrode 1 intersects the intersecting portion 2a of the X electrode 2 in a planar manner, and a contact hole 17a formed in the interlayer insulating film 16 in two adjacent electrode portions 1b across the intersecting portion 2a. Are electrically and mechanically connected to each other.
The touch panel 400 has a central region in which the plurality of electrodes 1Y and 1X are disposed, and a peripheral region disposed around the central region. In the peripheral region of the touch panel 400, as shown in FIG. 15, a plurality of peripheral wirings 6 electrically connected to each of the plurality of electrodes 1Y and the plurality of X electrodes 2 are arranged.
The Y electrode 1 and the X electrode 2 are made of, for example, ITO (Indium Tin Oxide).

Next, a method for manufacturing the touch panel 400 shown in FIG. 15 will be described.
First, a first ITO film (Indium Tin Oxide) is formed on the surface of the observer side of the glass substrate 5, and then a silver alloy film is formed.
Next, a resist pattern is formed by a photolithography process, and the silver alloy film is patterned. Next, the resist is peeled and removed, a resist pattern is formed by a photolithography process, and the first ITO film is patterned.
Thereafter, the resist is peeled and removed to form the intersecting portion 1a of the patterned Y electrode 1 and the peripheral wiring 6 as shown in FIG.
Next, a photosensitive interlayer insulating film 16 is applied on the substrate on which the intersecting portion 1a of the Y electrode 1 and the peripheral wiring 6 are formed, and is patterned by a photolithography technique. Here, contact holes 17 a and 17 are provided in the interlayer insulating film 16. Further, the interlayer insulating film 16 is removed from the connection portion 7 used for connection with the external drive circuit.
Next, a second ITO film is formed on the glass substrate 5, a resist pattern is formed by a photolithography process, and the second ITO film is patterned. Thereafter, the resist is peeled and removed to form an electrode portion 1b of the Y electrode 1, an intersecting portion 2a of the X electrode, and an electrode portion 2b as shown in FIG. In this step, the intersecting portion 1a of the Y electrode 1 is connected to the electrode portion 1b of the Y electrode 1 through ITO in the contact hole 17a. Further, both ends of the Y electrode 1 and both ends of the X electrode 2 are connected to the peripheral wiring 6 through ITO in the contact hole 17.
Next, the same film as the insulating film used in the previous step is applied again on the substrate as the uppermost protective film 19. A pattern is formed on the uppermost protective film 19 by a photolithography process.
Finally, an ITO film is formed as the transparent conductive layer 603 on the back surface of the glass substrate 5.

15 to 17, the example in which the intersecting portion 1a of the Y electrode 1 and the peripheral wiring 6 are formed in the same layer on the glass substrate 5 has been described. However, the electrode portion 1b of the Y electrode 1 and the X portion The intersecting portion 2 a and the electrode portion 2 b of the electrode 2 may be formed in the same layer on the glass substrate 5, and the intersecting portion 1 a of the Y electrode 1 may be formed on the interlayer insulating film 16.
Further, in FIGS. 15 to 17, since the number of the electrode portions 1 b of the Y electrode 1 and the number of the electrode portions 2 b of the X electrode 2 are the same, the widths of the respective electrode portions (1 b and 2 b) are the same. When the number of electrode portions 1b of the Y electrode 1 and the number of electrode portions 2b of the X electrode 2 are different, for example, when the number of electrode portions 1b of the Y electrode 1 is larger than the number of electrode portions 2b of the X electrode 2, FIG. As shown, the width of the electrode portion 1b of the Y electrode 1 may be reduced. That is, the area of the Y electrode 1 is reduced to correspond to the ratio of the number of individual electrodes 2b of the X electrode 2 to the number of individual electrodes 1b of the Y electrode 1, and the individual electrode 1a and the floating potential electrode (dummy electrode) 4 may be separated.
As described above, according to the present embodiment, it is possible to produce a touch panel excellent in detection sensitivity in the capacitive coupling input device for a display device for image information and character information.
Note that the present invention is not limited to the shape of the input detection area and the shape of the individual electrodes. In the embodiment, the electrodes in the X direction and the Y direction that are orthogonal to each other are described. However, if the purpose is to improve the S / N ratio between the electrode lines used to detect the input position, the electrodes intersect diagonally. It is also effective for capacitance between electrodes having different lengths.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is a top view which shows schematic structure of the display apparatus with a touchscreen of the Example of this invention. FIG. 2 is a cross-sectional view showing a cross-sectional structure taken along the line A-A ′ of FIG. 1. It is a block diagram which shows the basic composition of the liquid crystal display panel of the Example of this invention. It is a top view which shows schematic structure of the touchscreen of the Example of this invention. It is a top view which shows the state which mounted the flexible printed circuit board in the touchscreen of the Example of this invention. It is a perspective view which shows schematic structure of the front panel of the Example of this invention. It is the top view and sectional drawing which show schematic structure of the touchscreen of the Example of this invention. It is a top view which shows schematic structure of the touchscreen of the Example of this invention. It is sectional drawing which shows schematic structure of the modification of the display apparatus with a touchscreen of the Example of this invention. It is sectional drawing for demonstrating the 1st process of the manufacturing method of the touchscreen of the Example of this invention. It is sectional drawing for demonstrating the 2nd process of the manufacturing method of the touchscreen of the Example of this invention. It is sectional drawing for demonstrating the 3rd process of the manufacturing method of the touchscreen of the Example of this invention. It is sectional drawing for demonstrating the 4th process of the manufacturing method of the touchscreen of the Example of this invention. It is sectional drawing for demonstrating the 5th process of the touchscreen manufacturing method of the Example of this invention. It is a top view which shows schematic structure of the modification of the touchscreen of the Example of this invention. FIG. 16 is a cross-sectional view showing a cross-sectional structure along the line A-A ′ of FIG. 15. FIG. 16 is a cross-sectional view showing a cross-sectional structure along the line B-B ′ of FIG. 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Y electrode 1a, 2a Crossing part 1b, 2b Electrode part 2,2-1,2-2 X electrode 3 Input area 4 Floating electrode 5 Glass substrate 6,6-1,6-2,6-a, 6-b Wiring 7 Connection terminal 8 Interval 12 Front protective plate 14 First ITO film 15 Silver alloy film 16 Interlayer insulating film 17, 17a Contact hole 18 Second ITO film 19 Uppermost protective film 30 Spacer 50 Drive circuit 71, 72 Flexible Printed circuit board 73, 73-1, 73-2 Wiring 73-3 Power supply wiring 74 External device side input / output terminal 75, 76 Dummy terminal 77 Cross wiring 78 Through hole 79 Touch panel side input / output terminal 80 Conductive member 81 Back connection pad 81 -1 Front / back connection pad 81-2 Front / back connection pad 82 Back connection terminal 82-1 Back connection terminal 83 Dummy connection terminal 84 Wiring 300 Display Device 400 Touch Panel 501 First Adhesive Material 502 Second Adhesive Material 600 Liquid Crystal Display Panel 601 602 Polarizing Plate 603 Transparent Conductive Layer,
608 Pixel part 609 Display area 610 Thin film transistor 611 Pixel electrode 612 Concave part 614 Peripheral part 615 Counter electrode (common electrode)
621 Scanning signal line (gate signal line)
622 Video signal line (drain signal line)
625 Counter electrode signal line 631 Wiring 640 Connector 620, 630 Substrate 700 Backlight,
750 Metal frame 755 Mold frame 780 Transparent conductive layer 770 Conductive resin

Claims (18)

A display panel;
A capacitive touch panel placed over the display panel;
A front panel disposed over the capacitive touch panel;
A plurality of X electrodes formed on the front surface of the capacitive touch panel; a plurality of Y electrodes intersecting with the X electrodes;
A back electrode formed on the back surface of the capacitive touch panel;
An X electrode signal wiring for supplying a signal from both ends of the X electrode;
Y electrode signal wiring for supplying signals from both ends of the Y electrode;
A flexible substrate connected to the X electrode signal wiring and the Y electrode signal wiring at a connecting portion;
The X electrode and the Y electrode have an intersecting portion overlapping each other and an electrode portion formed between the two intersecting portions,
Forming a back connection terminal on the front surface of the capacitive touch panel adjacent to the connection portion and outside the Y electrode signal wiring;
Connecting the back surface connection terminal and the back electrode with a conductive member;
A display device, wherein a recess is formed in the front panel, and the capacitive touch panel is accommodated in the recess.   The display device according to claim 1, wherein the conductive member connected to the back electrode of the capacitive touch panel is formed of a conductive tape.   The display device according to claim 1, wherein the conductive member and the back surface connection terminal are connected by an anisotropic conductive film.   The display device according to claim 1, wherein the back electrode is formed of a transparent conductive film.   The area of the electrode part of the Y electrode is smaller than the area of the electrode part of the X electrode, and a dummy electrode is formed in the vicinity of the electrode part of the X electrode or the Y electrode. Display device.   The display device according to claim 1, wherein the electrode portion of the X electrode and the electrode portion of the Y electrode are formed in the same layer. A display panel with a long side and a short side;
A capacitive touch panel adhered on the display panel;
A front panel adhered on the capacitive touch panel;
The capacitive touch panel includes a plurality of X electrodes formed on a front surface, a plurality of Y electrodes intersecting with the X electrodes,
A back electrode formed on the back surface of the capacitive touch panel;
A flexible substrate electrically connected to the X electrode and the Y electrode;
A short terminal on the front surface of the capacitive touch panel, and a connection terminal for connecting an X electrode and a Y electrode to the flexible substrate;
The X electrode and the Y electrode have an intersecting portion that overlaps each other, and an individual electrode that is formed between two intersecting portions and wider than the intersecting portion,
The Y electrode is formed along the long side,
The X electrode is formed along the short side,
On the short side of the front surface of the capacitive touch panel, a back connection terminal is formed adjacent to the connection terminal connected to the Y electrode,
Connecting the back surface connection terminal and the back electrode with a conductive member;
A display device, wherein a recess is formed in the front panel, and a front surface of the capacitive touch panel is bonded to the recess.   The display device according to claim 7, wherein a conductive member connected to a back electrode of the capacitance touch panel is formed of a conductive tape.   The display device according to claim 7, wherein the conductive member and the back surface connection terminal are connected by an anisotropic conductive film.   The display device according to claim 7, wherein the back electrode is formed of a transparent conductive film.   The area of the individual electrode of the Y electrode is smaller than the area of the individual electrode of the X electrode, and a dummy electrode is formed in the vicinity of the individual electrode of the X electrode or the Y electrode. Display device.   The display device according to claim 7, wherein the individual electrode of the X electrode and the individual electrode of the Y electrode are formed in the same layer. A display panel;
A capacitive touch panel provided on the display panel;
A front panel provided on the capacitive touch panel;
A plurality of X electrodes formed on the front surface of the capacitive touch panel; a plurality of Y electrodes intersecting with the X electrodes;
A back electrode formed on the back surface of the capacitive touch panel;
A first wiring for supplying a signal to the X electrode;
A second wiring for supplying a signal to the Y electrode;
A flexible substrate on which the first and second wirings are formed;
The X electrode and the Y electrode have an intersecting portion that overlaps each other, and an individual electrode that is formed between two intersecting portions and wider than the intersecting portion,
The flexible substrate has an external device side input / output terminal and a capacitance touch panel side input / output terminal,
Arranged on the capacitive touch panel side input / output terminal, provided a connection terminal for the back surface,
A constant voltage power supply is supplied to the connection terminal for the back surface through the flexible substrate,
The back electrode and the back connection terminal are connected by a conductive member,
A display device, wherein a recess is formed in the front panel, and a front surface of the capacitive touch panel is bonded to the recess.   The display device according to claim 13, wherein a conductive member connected to a back electrode of the capacitance touch panel is formed of a conductive tape.   The display device according to claim 13, wherein the conductive member and the back surface connection terminal are connected by an anisotropic conductive film.   The display device according to claim 13, wherein the back electrode is formed of a transparent conductive film.   The area of the individual electrode of the Y electrode is smaller than the area of the individual electrode of the X electrode, and a dummy electrode is formed adjacent to the individual electrode of the X electrode or the Y electrode. Display device.   The display device according to claim 13, wherein the individual electrode of the X electrode and the individual electrode of the Y electrode are formed in the same layer.

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