JP2010211348A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device with a capacitance coupling type touch panel for performing a finger touch input with high reliability and excellent detection sensitivity. <P>SOLUTION: The capacitance touch panel includes: a plurality of X electrodes; a plurality of Y electrodes to be intersected with the X electrodes; and a flexible substrate where a plurality of first signal wires for supplying signals from the both ends of the X electrodes, a plurality of second signal wires for supplying signals from the both ends of the Y electrodes, first wiring to be connected to the first signal wires, and second wiring to be connected to the second signal wires are formed. The X electrodes and the Y electrodes have: intersection parts to be mutually superimposed; and electrode parts formed between the two intersection parts. The flexible substrate has a conductive film for shielding, which is formed in the circumference of the first and second wires. The first and second wires are intersected on the flexible substrate and branched into a plurality of routes on the flexible substrate. <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.

Special table 2003-511799 gazette

The capacitively coupled touch panel includes a plurality of X electrodes extending in a first direction (for example, Y direction) and provided in a second direction (for example, X direction) intersecting the first direction, A plurality of Y electrodes extending in the second direction intersecting with the X electrodes and provided side by side in the first direction are provided. 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 electrodes and Y electrodes are formed of a transparent conductive material such as ITO (Indium Tin Oxide).
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. And a ground capacitance between the display device arranged under the touch panel and a wiring capacitance generated in the 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 inter-electrode capacitance 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 the detection sensitivity of the touch panel, a ratio of capacitance change when touched by a finger or the like and 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.

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, it is known that the S / N ratio can be improved by supplying a signal from the control IC from both ends of the X electrode and the Y electrode. However, since signals are 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 increases the wiring capacity of the wiring on the flexible substrate. become.
If the wiring capacity of the wiring on the flexible substrate increases, noise can be easily detected, and malfunction or non-operation may occur even if nothing is done.
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.
When a signal is supplied from both ends of the electrode of the XY touch panel to improve the S / N ratio, the wiring capacity of the wiring on the flexible substrate increases, and noise is easily detected. Therefore, a shield conductive film is formed around the wiring connected from the output of the control IC to the electrode on the touch panel. 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.
In addition, in order to make the capacitance on the electrode 1 line equal in the X direction and the Y direction, the area of the electrode having a large number of electrodes was reduced, and the noise intensity was made equal in the X direction and the Y direction. That is, the S / N ratio was made equal in the X direction and the Y direction.

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.

It is a schematic plan view of a display device with a touch panel which is a premise of the present invention. It is a schematic sectional drawing of the display apparatus with a touchscreen used as the premise of this invention. 1 is a schematic plan view of a touch panel of a display device with a touch panel as a premise of the present invention. It is the schematic plan view which mounted the flexible printed circuit board in the touchscreen of the display apparatus with a touchscreen which is a premise of this invention. It is a schematic sectional drawing of the modification of the display apparatus with a touchscreen used as the premise of this invention. It is a schematic sectional drawing of the 1st process of the touchscreen of the display apparatus with a touchscreen used as the premise of this invention. It is a schematic sectional drawing of the 2nd process of the touchscreen of the display apparatus with a touchscreen used as the premise of this invention. It is a schematic sectional drawing of the 3rd process of the touchscreen of the display apparatus with a touchscreen used as the premise of this invention. It is a schematic sectional drawing of the 4th process of the touchscreen of the display apparatus with a touchscreen used as the premise of this invention. It is a front view of the touch panel of the Example of this invention. It is a back view of the touch panel of the Example of this invention. It is a side view of the touch panel of the Example of this invention. It is a figure which shows the layout of the front side of the flexible printed circuit board of the Example of this invention. It is a figure which shows the layout by the side of the back surface of the flexible printed circuit board of the Example of this invention.

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.
[Display device with touch panel as a premise of the present invention]
FIG. 1 is a plan view showing a schematic configuration of a display device with a touch panel which is a premise of the present invention. 2 is a cross-sectional view taken along line AA ′ of FIG.
As shown in FIG. 1 and FIG. 2, a display device 300 with a touch panel, which is a premise of the present invention, is a liquid crystal display panel 600 and a capacitive coupling type device disposed on a viewer side surface of the liquid crystal display panel 600. A touch panel 400 and a backlight 700 disposed below the viewer side of the liquid crystal display panel 600 are provided. As the liquid crystal display panel 600, for example, an IPS, TN, or VA liquid crystal display panel 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 referred to as a front window) 12 made of an acrylic resin or the like 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.

A transparent conductive layer 603 is provided between the liquid crystal display panel 600 and the polarizing plate 601. This 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.
A change in voltage in the liquid crystal display panel 600 with respect to the electrodes provided on the capacitively coupled touch panel 400 becomes noise. Therefore, it is necessary to electrically shield the liquid crystal display panel 600, and the transparent conductive layer 603 is provided. In order to function as a shield, 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.
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 is known to be related to the size of the crystal grains. However, by setting the heat treatment temperature at the time of forming the transparent conductive layer 603 to 200 ° C. or higher, crystallization is promoted to form a sheet. The resistance value can be 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.

A drive circuit Dr 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 Dr. A flexible printed circuit board 72 is electrically connected to the drive circuit Dr in order to supply an external signal. A flexible printed circuit board 71 is also connected to the touch panel 400. A touch panel control circuit (not shown) is connected to the flexible printed circuit board 71, and detection of an input position and the like are controlled by the touch panel control circuit.
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.
The substrate 620 is also called a TFT substrate, on which pixel electrodes, thin film transistors, and the like are formed, and a drive circuit Dr that supplies signals is mounted. The region where the drive circuit Dr is mounted protrudes from the other substrate 630 and has a single plate shape. There may be a problem that the substrate 620 is damaged in the mounting region of the drive circuit Dr. Therefore, the spacer 30 is inserted between the substrate 620 and the touch panel 400 to improve the strength.

Next, FIG. 3 shows a schematic diagram of the touch panel 400. FIG. 3 shows a case where the touch panel 400 is used in a portrait orientation. 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. 3, it is assumed that the liquid crystal display panel 600 used to overlap the touch panel 400 also has a vertically long shape.
The touch panel 400 uses a glass substrate 5 as a transparent substrate, touch panel electrodes 1 and 2, connection terminals 7, and wiring 6 from the touch panel electrodes 1 and 2 to the connection terminals 7 on one surface of the glass substrate 5. And place. At least the intersecting portion of the two kinds of electrodes arranged so as to be orthogonal is separated by an insulating film.
The electrodes 1 and 2 for the touch panel are formed of a transparent conductive film, and an electrode extending in the vertical direction (Y direction in the drawing) and arranged in parallel in the horizontal direction (X direction) is referred to as an X electrode 1. An electrode extending in the horizontal direction (X direction) so as to cross the X electrode 1 and formed in parallel in the vertical direction (Y direction) is referred to as a Y electrode 2. Changes in the capacitances of the X electrode 1 and the Y electrode 2 are detected, and the touched position is calculated. A detectable area inside the dotted line indicated by reference numeral 3 is called an input area.
Each of the X electrode 1 and the Y electrode 2 has a narrow width at the crossing portions 1a and 2a, and a wide width at the electrode portions 1b and 2b sandwiched between the two crossing portions 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. 3, the width of the individual electrode 1b of the X electrode 1 of the touch panel 400 is reduced. That is, the area of the X electrode 1 is reduced to correspond to the ratio of the number of the individual electrodes 1b of the Y electrode 2 to the number of the individual electrodes 1b of the X electrode 1, so that the individual electrode 1a and the floating potential electrode are reduced. (Dummy electrode) 4 is separated.
For this reason, the area of the X electrode 1 whose electrode area has increased in accordance with the vertically long shape is reduced to make the capacitance on one line substantially equal to that of the Y electrode 2, and due to fluctuations in the signal voltage generated from the liquid crystal display panel 600. Noise was made equal between the X electrode 1 and the Y electrode 2.
As described above, the liquid crystal display panel 600 is provided with the transparent conductive layer 603 to suppress the influence of noise from the liquid crystal display panel 600. However, it is difficult to form the transparent conductive layer 603 on the liquid crystal display panel 600 at a high temperature, and the transparent conductive layer 603 having a sufficiently low resistance may not be provided on the liquid crystal display panel 600. Even when the transparent conductive layer 603 is provided, the influence of noise from the liquid crystal display panel 600 may be 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 is different 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 X electrode arranged in parallel to the Y direction is larger than the capacity of one line of the Y electrode arranged in 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.

The display device with a touch panel, which is a premise of the present invention, can 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. 3, when the floating electrode 4 is not arranged, the interval 8 between the adjacent X electrode 1 and Y electrode 2 becomes wide. As described above, the X electrode 1 and the Y electrode 2 are formed of a transparent conductive film. In the gap portion 8, an insulating film and a glass substrate are formed, and a region without the transparent conductive film is formed. Regarding 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.
In our examination, when the interval part 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 portion 8 is narrowed, the capacitance between the X electrode 1 and the Y electrode 2 that are adjacent via the floating electrode 4 increases. In addition, by narrowing the gap portion 8, the defect that the X electrode 1 or the Y 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.
If the floating electrode 4 adjacent to the individual electrode 1b of the X electrode 1 is short-circuited, the ground capacity for the corresponding X electrode 1 line increases, noise increases, and the detection sensitivity decreases. The floating electrode 4 is divided into four parts as shown in FIG. 1 in order to reduce the increased capacitance when short-circuited. When the subdivision is finer, the concern about short-circuit defects is reduced, but the area without the transparent conductive film increases in the corresponding area, and 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 the display device with a touch panel, which is a premise of the present invention, the case where it is used by being overlapped with a vertically long liquid crystal display device has been shown. Will not change. Further, the number of divisions of the floating electrode is not limited to four divisions.

Next, FIG. 4 shows a touch panel 400 in which a flexible printed circuit board 71 is attached. The flexible printed board 71 is electrically connected to the connection terminal 7 of the touch panel 400 and supplies the touch panel 400 with various signals output from a touch panel control circuit (not shown).
First, a signal output from the touch panel 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 is formed so as to surround the other wiring 73 by supplying a ground potential (GND) for the purpose of shielding.
Signals are supplied to both the X electrode 1 and the Y electrode 2 provided on the touch panel 400 from both ends, and the signal detection accuracy is increased. That is, when a change in capacitance is detected by supplying a charge to each X electrode 1 and Y electrode 2 and measuring the time to reach a certain voltage, by supplying the charge from both ends of the electrode, It is possible to suppress the measurement error that occurs.
Therefore, as shown by Y electrodes 2-1 and 2-2 in FIG. 4, the wiring 6-1 is connected to the Y electrode 2-1 from the right side in the drawing, and the wiring 6-2 is connected to the Y electrode 2- from the left side in the drawing. 2 is connected. Similarly, the X electrode 1 is also connected to the wiring 6 at both upper and lower ends.

As described above, in order to supply signals from both ends of the X electrode 1 and the Y electrode 2, it is necessary to branch and supply the signal output from the touch panel control circuit to the two ends. By branching to 73-1 and 73-2, signals can be supplied from both ends of the X electrode 1 and the Y electrode 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.
In order to supply signals from both ends of the X electrode 1 and the Y electrode 2, there is a specific problem that the wirings intersect. Especially when the connection terminal 7 is formed on the short side, the vertical direction (in the drawing) In the X electrode 1 extending in the Y direction and parallel in the horizontal direction (X direction), the wiring 6 is connected to the wiring 6-b near the center of the touch panel 400 and the wiring 6-a near the outer edge. .
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 X electrode 1 is larger than the wiring capacity of the Y electrode 2. As described above, the X 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 Y electrode 2. Therefore, when the connection terminal 7 is formed on the short side, the area of the X electrode 1 is reduced, the capacitance on one line is made substantially equal to that of the Y electrode 2, and the fluctuation of the signal voltage generated from the liquid crystal display panel 600 occurs. It is effective to make the noise caused by the same between the X electrode 1 and the Y electrode 2.

Next, the spacer 30 is attached to the flexible printed circuit board 71 in FIG. 5, the touch panel 400 and the spacer 30 are integrally formed, and then the touch panel 400 is combined with the liquid crystal display panel 600 to easily mount the spacer 30. Indicates.
The spacer 30 is attached to the flexible printed circuit board 71 attached to the touch panel 400 with an adhesive or the like, and is easily mounted on the liquid crystal display panel 600. In addition, by attaching the spacer 30 to the flexible printed circuit board 71, it is possible to absorb a minute step by the flexible printed circuit board 71.
In FIG. 5, the polarizing plate 601 is provided between the touch panel 400 and the front window 12. By providing the polarizing plate 601 on the touch panel 400, the problem that the electrode pattern of the touch panel 400 is observed is reduced.

Next, a manufacturing method of a touch panel in a display device with a touch panel, which is a premise of the present invention, will be described with reference to FIGS. A schematic cross-sectional view of each process step along the line BB ′ in FIG. 3 is shown in FIG. Similarly, a schematic cross-sectional view of each process step along the line CC ′ in FIG. 3 is shown in FIG.
First, the first step will be described with reference to FIG. In the process shown in FIG. 6, after a first ITO film 14 (Indium Tin Oxide) is formed on the glass substrate 5 to a thickness of about 15 nm, a silver alloy film 15 is formed to a thickness of about 200 nm. A resist pattern is formed by a photolithography process, and the silver alloy film 15 is patterned. Next, the resist is peeled and removed, a resist pattern is formed by a photolithography process, and the first ITO film 14 is patterned.
Thereafter, the resist is peeled and removed to form a patterned ITO film 14 and a silver alloy pattern 15 as shown in FIG. Since the silver alloy pattern 15 is opaque, in order to avoid being visually recognized, the silver alloy pattern 15 is removed from a portion of the liquid crystal display panel 600 to be overlapped later, and only the peripheral wiring pattern 6 is formed in the silver alloy pattern 15. .

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 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. 7B, a contact hole 17 is provided in the peripheral portion. Further, the interlayer insulating film pattern 16 is removed from the connection portion 7 used for connection to the external drive circuit.
Next, a 3rd process is demonstrated using FIG. The second ITO film 18 is formed to a thickness of about 30 nm, a resist pattern is formed by a photolithography process, and the second ITO film 18 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. The touch panel 400 is formed through the above steps.

[Example]
The display device with a touch panel according to the embodiment of the present invention is different in the configuration of the touch panel 400 from the above-described display device with a touch panel which is the premise of the present invention.
Hereinafter, the touch panel 400 of the display device with a touch panel according to the present embodiment will be described.
10 to 14 are diagrams for explaining the touch panel according to the present embodiment. FIG. 10 is a front view of the touch panel according to the present embodiment as viewed from the observer side. FIG. 11 illustrates the touch panel according to the present embodiment. FIG. 12 is a side view of the touch panel of this embodiment, and FIG. 13 is a diagram showing a layout on the front side (observer side) of the flexible printed circuit board 71 of this embodiment. FIG. 14 is a diagram illustrating a layout on the back surface side (the side opposite to the observer) of the flexible printed circuit board 71 of the present embodiment.
Note that the layout on the back side (opposite to the observer) of the flexible printed circuit board 71 of this embodiment shown in FIG. 14 shows a layout seen through from the observer side (usually a layout described by a broken line). Yes.
As shown in FIGS. 10 to 14, the flexible printed circuit board 71 of the present embodiment has a touch panel control circuit (IC) for a touch panel mounted on the flexible printed circuit board 71, a point having a bent portion 50, and a touch panel use. The flexible printed circuit board 71 which is the premise of the present invention described above in that the reinforcing plate 52 is disposed on the back side of the region where the touch panel control circuit (IC) is mounted and the conductive film 53 for shielding is provided. Is different.
In the touch panel 400 of the present embodiment, the individual electrode 1b of the X electrode 1 has the same area as the individual electrode 2b of the Y electrode 2, but may have the electrode shape shown in FIG.

In this embodiment, as shown in FIGS. 13 and 14, the wiring is formed to be bent in order to shorten the length of the flexible printed circuit board 71 (the length in the extending direction of the X electrode 1). 73-5 also serves as a wiring (73 in FIG. 4) and a cross wiring (77 in FIG. 4). However, also in this embodiment, the cross wiring and the wiring are orthogonal to each other so that the overlapping area is as small as possible. That is, the cross wiring is formed along the X direction, and the wiring is formed along the Y direction.
In the present embodiment, a shielding conductive film 53 is formed around the wiring 73-5. The shielding conductive film 53 is formed around each wiring (73-6 in FIG. 14) or around a plurality of wirings (73-5 in FIG. 13, 43-7 in FIG. 14). .
13 and 14, reference numeral 54 denotes a conductive film to which a reference potential (for example, GND) is supplied.
The shield conductive film 53 has a reference potential (eg, GND) or a voltage having the same waveform as the drive voltage supplied to the wiring 73-5 (eg, the same voltage as the drive voltage supplied to the wiring 73-5). ). Thereby, it is possible to improve the sensitivity of the touch panel 400 by preventing external noise from directly affecting the wiring 73-5.
In addition, a method of supplying a driving voltage to all the wirings 73-5 at the same time is also known. However, this embodiment is particularly effective in a case of supplying a driving voltage to all the wirings 73-5 at the same time. It becomes.

In this embodiment, the bent portion 50 is formed on the flexible printed circuit board 71. The bent portion 50 is a single-layer wiring (or single-sided wiring) in which wiring is formed only on one side of the base film, and further, a through hole 51 is formed to reduce the repulsive force when bent.
In the flexible printed circuit board 71 of the present embodiment, the reinforcing plate 52 is disposed on the back side of the region separated by the bent portion 50 and where the touch panel control circuit (IC) for the touch panel is mounted. This makes the flexible printed circuit board 71 difficult to bend and prevents touch panel control circuits (ICs) for touch panels mounted on the flexible printed circuit board 71 or electronic components (capacitors, resistors, etc.) from being damaged and peeling off the circuit board. ing.
As described above, according to the present invention, it is possible to produce a touch panel with excellent detection sensitivity in a capacitively coupled 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.

1 X electrode 2 Y electrode
3 Input region 4 Floating electrode 5 Glass substrate 6 Peripheral wiring 7 Connection terminal 12 Front protective plate 14 First ITO film 15 Silver alloy film 16 Interlayer insulating film 17 Contact hole 18 Second ITO film 19 Uppermost protective film 30 Spacer DESCRIPTION OF SYMBOLS 50 Bending part 51 Through-hole 52 Reinforcing plate 53 Conductive film for shielding 54 Conductive film to which a reference potential is supplied 71 Flexible printed circuit board 73 Wiring 78 Through hole 300 Display device 400 Touch panel 501 First adhesive 502 Second adhesive 600 Liquid crystal display panel 603 Transparent conductive layer 700 Backlight IC Touch panel control circuit Dr drive circuit

Claims (12)

A display panel;
A capacitance touch panel formed on the display panel,
The capacitive touch panel includes a plurality of X electrodes,
A plurality of Y electrodes intersecting with the plurality of X electrodes;
A plurality of first signal wirings for supplying signals from both ends of the plurality of X electrodes;
A plurality of second signal wirings for supplying signals from both ends of the plurality of Y electrodes;
A flexible substrate on which a first wiring connected to the plurality of first signal wirings and a second wiring connected to the plurality of second signal wirings are formed;
The X electrode and the Y electrode have an intersecting portion overlapping each other and an electrode portion formed between the two intersecting portions,
The flexible substrate has a conductive film for shielding formed around the plurality of first and second wirings,
The plurality of first and second wirings intersect on the flexible substrate, and the plurality of first and second wirings are branched into a plurality of paths on the flexible substrate. Display device.   The display device according to claim 1, wherein a dummy electrode is formed adjacent to an electrode portion of the X electrode or the Y electrode.   The display according to claim 1, wherein the X electrode and the Y electrode are made of a transparent conductive film formed with an insulating film interposed therebetween, and the dummy electrode is made of a transparent conductive film in the same layer as the electrode portion. apparatus.   The display device according to claim 1, wherein the conductive film for shielding is formed around at least one of the plurality of first and second wirings.   The display device according to claim 1, wherein the conductive film for shielding is formed around a plurality of wirings in the plurality of first and second wirings. A display panel;
A capacitive touch panel adhered on the display panel;
The display panel has a long side and a short side,
The capacitive touch panel includes a plurality of X electrodes,
A plurality of Y electrodes intersecting with the plurality of X electrodes;
A plurality of first and third signal wirings for supplying signals to the plurality of X electrodes;
A plurality of second and fourth signal wirings for supplying signals to the plurality of Y electrodes;
A first wiring connected to the plurality of first signal wirings; a second wiring connected to the plurality of second signal wirings; and a third wiring connected to the plurality of third signal wirings. And a flexible substrate on which a fourth wiring connected to the plurality of fourth signal wirings is 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 a conductive film for shielding formed around the first to fourth wirings,
The X electrode is formed along the long side,
One ends of the first and third signal wirings are respectively connected to the X electrodes at both ends of the long side,
One end of the first and third wirings is connected on the flexible substrate,
The Y electrode is formed along the short side,
One end portions of the second and fourth signal wires are respectively connected to the Y electrodes at both ends of the short side,
One end of said 2nd and 4th wiring is connected on the said flexible substrate, The display apparatus characterized by the above-mentioned.   The display device according to claim 6, wherein a dummy electrode is formed adjacent to the individual electrode of the X electrode.   The X electrode and the Y electrode are made of a transparent conductive film formed with an insulating film interposed therebetween, and the dummy electrode is made of a transparent conductive film in the same layer as the X electrode. Display device.   The display device according to claim 6, wherein the conductive film for shielding is formed around at least one of the plurality of first to fourth wirings.   The display device according to claim 6, wherein the conductive film for shielding is formed around a plurality of the first to fourth wirings. The flexible substrate has a bent portion;
In the bent portion, the signal wiring is formed only on one surface of the flexible substrate,
The display device according to claim 1, wherein a through-hole is formed in the bent portion. The flexible substrate has a detection circuit for touch position detection mounted on one surface,
The display device according to claim 1, further comprising a reinforcing plate on the other surface of the area where the detection circuit of the flexible substrate is mounted.

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