JP2013016205A - Capacitive coupling type touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitive coupling type touch panel in which characteristic decrease is suppressed and low cost is achieved.SOLUTION: A capacitive coupling type touch panel includes: a first shield conductor formed on a first surface of a substrate; an insulator film formed on the first conductor; plural first electrodes formed on the insulator film, extending in a first direction, and arranged in parallel; and plural second electrodes formed on the insulator film, extending in a second direction, and arranged in parallel. The first shield conductor receives a predetermined signal. Each of the plural first electrodes includes a first portion formed on the first surface of the substrate and a second portion formed away from the second electrodes on the insulator film. The first portion is connected to the second portion through a contact hole formed in the insulator film. The first shield conductor includes plural openings. The plural openings each include a first opening with the first portion formed in its opening and a second opening without the first portion formed in its opening.

Description

  The present invention relates to a display device with a touch panel, and particularly to a display device with a touch panel provided with a capacitively coupled touch panel.

As a main method of a touch panel, a method for detecting a change in light and a method for detecting a change in electrical characteristics are known. As a method for detecting a change in electrical characteristics, a capacitive coupling method is known. (See Patent Document 1 and Patent Document 2 below)
16 to 18 are diagrams related to a conventional capacitive coupling type touch panel, FIG. 16 is a plan view showing an electrode pattern, and FIG. 17 is a cross-sectional view showing a cross-sectional structure taken along line FF ′ of FIG. 18 and 18 are cross-sectional views showing a cross-sectional structure along the line GG ′ of FIG.
As shown in FIGS. 16 to 18, a conventional capacitively coupled touch panel extends in a first direction (for example, the X direction) and intersects the first direction (for example, Y direction). A plurality of electrodes 1 </ b> X arranged in parallel in the first direction, and a plurality of electrodes 2 </ b> Y extending in the second direction intersecting with the electrodes 1 </ b> X and arranged in parallel in the first direction. . The plurality of electrodes 2Y are disposed on the substrate 11 and covered with an insulating film 12 formed in an upper layer thereof. The plurality of electrodes 1X are disposed on the insulating film 12, and are covered with a protective film 13 formed in an upper layer thereof. The electrodes 1X and 2Y are made of a transparent conductive material such as ITO (Indium Tin Oxide).
Further, as shown in FIGS. 17 and 18, the conventional capacitive coupling type touch panel has a planar shielding conductor 15 on the surface of the substrate 11 opposite to the observer side. . The shield conductor 15 receives a predetermined signal and reduces noise from the display panel to the touch panel. The shield conductor 15 is formed of a transparent conductive film such as ITO.

  As prior art documents related to the invention of the present application, there are the following.

JP 2008-65748 A Japanese Patent Application No. 2007-175050

  In the conventional capacitive coupling type touch panel, as shown in FIGS. 16 to 18, the plurality of electrodes 1 </ b> X and the plurality of electrodes 2 </ b> Y are formed on different conductive layers (lower layer and upper layer) through the insulating film 12. ing. In the case of such an electrode structure, the protective film 13 formed on the insulating film 12 and the upper electrode 1X is distorted by the upper electrode 1X. Since the optical path length differs between the upper layer, a color difference occurs between the lower layer electrode 1X and the upper layer electrode 2Y, and the electrode patterns of the electrode 1X and the electrode 2Y become obvious. Such an actualization of the electrode pattern causes deterioration of optical characteristics and causes deterioration of the characteristics of a display device incorporating a touch panel, and thus countermeasures are necessary.

Further, in the conventional capacitive coupling type touch panel, as shown in FIGS. 17 and 18, a shielding conductor is provided on the surface (back surface) opposite to the surface (main surface) on the viewer side of the substrate 11. 15 is provided. In the case of such a structure, the shielding conductor 15 is formed on the transparent conductive material layer for forming the electrode 1X and the transparent conductive material layer for forming the electrode 2Y as the transparent conductive material layer. Therefore, three transparent conductive material layers to which the transparent conductive material layer is added are necessary, which becomes a factor that hinders cost reduction.
Therefore, the present inventor made the present invention by paying attention to three transparent conductive material layers of the electrode 1X, the electrode 2Y, and the conductor 15 for shielding.
An object of the present invention is to provide a technology capable of suppressing deterioration in characteristics and reducing costs in a capacitively coupled touch panel.
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.

(1) A display panel and a capacitively coupled touch panel disposed on an observer side surface of the display panel, the touch panel on a surface of the substrate and the observer side of the substrate A first conductor for shielding formed, an insulating film formed on the first conductor for shielding, and formed on the insulating film, extending in a first direction and extending in the first direction A plurality of first electrodes arranged in parallel in a second direction intersecting with the insulating film, and extending in the second direction extending in the second direction and aligned in the first direction intersecting with the second direction. A display device with a touch panel having a plurality of second electrodes provided, wherein a predetermined signal is input to the first conductor for shielding, and each of the plurality of first electrodes is connected to the substrate of the substrate. The first portion formed on the surface on the viewer side and the second electrode on the insulating film are A second portion formed separately, the first portion being connected to the second portion via a contact hole formed in the insulating film, and a plurality of first conductors for shielding The plurality of openings include a first opening in which the first portion is formed in the opening, and a second opening in which the first portion is not formed in the opening, The first portion is formed in the first opening.

(2) In (1), the first conductor for shielding has a mesh shape composed of a first piece and a second piece intersecting each other, and each of the first opening and the second opening. Is an opening formed by the first piece and the second piece constituting the mesh shape.
(3) In the above (2), the second electrode includes a first portion that intersects the first portion of the first electrode in a plan view, and a second portion that continues to the first portion, The second portion of the first electrode is formed in a square shape whose planar shape is wider than the first portion of the first electrode, and the second portion of the second electrode has a planar shape of the second shape. The second portion of the first electrode and the second portion of the second electrode are formed in a rectangular shape wider than the first portion of the electrode, and each side facing each other is in the first direction. The mesh-shaped first piece and second piece of the first conductor for shielding are arranged in a state of forming an acute angle, and the second part of the first electrode and the second part of the second electrode Are formed along each side facing each other.
(4) In (3), between the first portions of the two adjacent first electrodes, the mesh-shaped first piece and the second piece of the first conductor for shielding are provided. At least one is arranged.
(5) In (1), each of the plurality of first electrodes or the plurality of second electrodes is formed around a region where the plurality of first electrodes and the plurality of second electrodes are formed. A plurality of wirings that are electrically connected to each other, and the plurality of wirings are formed on the surface of the observer side of the substrate, and are formed so as to cover the plurality of wirings on the insulating film, It has the 2nd conductor for shielding into which a predetermined signal is inputted.
(6) In any one of the above (1) to (5), the touch panel has a protective film formed on the plurality of first electrodes and the plurality of second electrodes.
(7) In the above (6), the touch panel has a front panel formed on the protective film.

(8) A display panel and a capacitively coupled touch panel disposed on an observer-side surface of the display panel, the touch panel on a surface of the substrate and the display panel side of the substrate A plurality of first electrodes extending in a first direction and juxtaposed in a second direction intersecting the first direction; and formed on a surface of the substrate on the display panel side, A plurality of second electrodes extending in a second direction and juxtaposed in the first direction intersecting the second direction; and formed on the plurality of first electrodes and the plurality of second electrodes. And a shield conductor formed on the insulation film, wherein the shield conductor receives a predetermined signal and the plurality of first electrodes. Each of the first portion formed on the insulating film and the front of the substrate A second portion formed separately from the second electrode on the surface on the display panel side, and the first portion is connected to the second portion via a contact hole formed in the insulating film. The shielded conductor has a plurality of openings, and the plurality of openings includes a first opening in which the first portion is formed in the opening, and the first portion in the opening. And the second opening is not formed, and the first portion is formed in the first opening.

(9) In (8), the conductor for shielding has a mesh shape composed of a first piece and a second piece intersecting each other, and each of the first opening and the second opening is It is an opening formed by the first piece and the second piece constituting the mesh shape.
(10) In the above (9), the second electrode has a first portion that intersects the first portion of the first electrode in a plane, and a second portion that continues to the first portion, The second portion of the first electrode is formed in a square shape whose planar shape is wider than the first portion of the first electrode, and the second portion of the second electrode has the planar shape of the first portion. The second electrode is formed in a rectangular shape having a width wider than the first portion, and the second portion of the first electrode and the second portion of the second electrode have respective sides facing each other in the first direction. The mesh-shaped first piece and the second piece of the shielding conductor are arranged at an acute angle with respect to the second part of the first electrode and the second part of the second electrode. It is formed in a shape along each side facing each other.
(11) In the above (10), at least one of the first piece and the second piece of the conductor for shielding is arranged between the first portions of two adjacent first electrodes. ing.
(12) In (8), each of the plurality of first electrodes or the plurality of second electrodes is formed around a region where the plurality of first electrodes and the plurality of second electrodes are formed. A plurality of wirings electrically connected to the display panel, the plurality of wirings formed on the display panel side surface of the substrate, and a shield conductor formed to cover the plurality of wirings Has been.
(13) In any one of (8) to (12), the touch panel has a protective film formed on the plurality of first electrodes and the plurality of second electrodes.
(14) In any one of (1) to (13), the plurality of first electrodes and the plurality of second electrodes are formed of a transparent conductive film.

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 aim at suppression of a characteristic fall and cost reduction in a capacitive coupling type touch panel.

It is a top view which shows the electrode pattern of the touchscreen integrated in the display apparatus with a touchscreen of Example 1 of this invention. It is the top view which expanded a part of FIG. FIG. 2A is a cross-sectional view taken along line A-A ′ of FIG. 1 and FIG. 2B is an enlarged cross-sectional view of part of FIG. FIG. 2A is a cross-sectional view taken along line B-B ′ of FIG. 1 and FIG. 2B is an enlarged cross-sectional view of part of FIG. It is a top view which shows the conductor pattern for the shield of the touch panel of FIG. It is a block diagram which shows schematic structure of the display apparatus with a touchscreen of Example 1 of this invention. It is sectional drawing which shows the cross-section of the touchscreen which is a modification of Example 1 of this invention. It is a top view which shows the electrode pattern of the touchscreen integrated in the display apparatus with a touchscreen of Example 2 of this invention. It is the top view which expanded a part of FIG. FIGS. 8A and 8B are diagrams illustrating a cross-sectional structure of the touch panel in FIG. 8 (a) is a cross-sectional view taken along the line D-D ′ in FIG. 8, and FIG. 8A and 8B are diagrams showing a cross-sectional structure of the touch panel in FIG. 8 (a) is a cross-sectional view taken along the line E-E 'in FIG. 8, and FIG. It is a block diagram which shows schematic structure of the display apparatus with a touchscreen of Example 2 of this invention. It is a top view which shows the electrode pattern of the touchscreen integrated in the display apparatus with a touchscreen of Example 3 of this invention. It is a top view which shows the conductor pattern for shielding of FIG. It is a top view which shows the conductor pattern for the shield of the touchscreen integrated in the display apparatus with a touchscreen which is Example 4 of this invention. It is a top view which shows the electrode pattern of the conventional capacitive coupling type touchscreen. FIG. 17 is a cross-sectional view showing a cross-sectional structure along the line F-F ′ of FIG. 16. FIG. 17 is a cross-sectional view showing a cross-sectional structure along the line G-G ′ of FIG. 16.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments of the invention, those having the same function are given the same reference numerals, and the repeated explanation thereof is omitted.

[Example 1]
In the first embodiment, an example in which the present invention is applied to a display device with a touch panel provided with a touch panel on a liquid crystal display panel will be described as an example of a display panel.
1 to 6 are diagrams related to a display device with a touch panel according to a first embodiment of the present invention.
FIG. 1 is a plan view showing an electrode pattern of a touch panel incorporated in a display device with a touch panel,
FIG. 2 is an enlarged plan view of a part of FIG.
3 is a diagram showing a sectional structure of the touch panel of FIG. 1 ((a) is a sectional view taken along the line AA ′ of FIG. 1, (b) is a sectional view in which (a) is enlarged),
4 is a diagram showing a sectional structure of the touch panel of FIG. 1 ((a) is a sectional view taken along line BB ′ of FIG. 1, (b) is a sectional view enlarging a part of (a)),
FIG. 5 is a plan view showing a conductor pattern for shielding the touch panel of FIG.
FIG. 6 is a block diagram showing a schematic configuration of a display device with a touch panel,
In FIG. 6, the touch panel 20 shows a cross-sectional structure along the line CC ′ in FIG. 1.

As shown in FIG. 6, the display device with a touch panel according to the first embodiment includes a liquid crystal display panel 30, a capacitively coupled touch panel 20 disposed on the surface of the liquid crystal display panel 30 on the viewer side, A backlight 40 is provided below the surface of the liquid crystal display panel 30 opposite to the viewer side. As the liquid crystal display panel 30, 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 30 has a display area in which a plurality of pixels are arranged in a matrix, and a non-display area arranged around the display area. Each of the plurality of pixels has a pixel electrode and a counter electrode. In the non-display area, a light shielding film such as a black matrix is provided.
As shown in FIGS. 1 to 4, the touch panel 20 extends on the viewer side surface of the substrate 11 in a first direction (for example, the X direction), and each crosses the first direction. A plurality of electrodes 1X arranged in parallel in a second direction (for example, the Y direction) at a predetermined arrangement pitch, each extending across the plurality of electrodes 1X and extending in the second direction, And a plurality of electrodes 2Y arranged in parallel at a predetermined arrangement pitch in one direction.
Each of the plurality of electrodes 2Y is formed of an electrode pattern in which a first portion 2a and a second portion 2b having a width wider than the width of the first portion 2a are alternately arranged in the second direction. Yes. Each of the plurality of electrodes 2Y is arranged on the surface of the substrate 11 on the viewer side via an insulating film 12, and is covered with a protective film 13 formed thereon. As the substrate 11, for example, a transparent insulating substrate such as glass is used.

Each of the plurality of electrodes 1X is formed of an electrode pattern in which a first portion 1a and a second portion 1b having a width wider than the width of the first portion 1a are alternately arranged in the first direction. Yes. Each first portion 1a of the plurality of electrodes 1X is formed in a conductive layer different from the electrode 2Y, and intersects the first portion 2a of the electrode 2Y in a plane. Each second portion 1b of the plurality of electrodes 1X is formed separately from the electrode 2Y in the same conductive layer as the electrode 2Y. In the first embodiment, the first portion 1a of the electrode 1X is formed in a lower layer than the electrode 2Y when viewed from the substrate 11 side.
Like the electrode 2Y, each of the second portions 1b of the plurality of electrodes 1X is disposed on the surface on the viewer side of the substrate 11 via the insulating film 12, and is covered with a protective film 13 formed thereon. ing. Each first portion 1a of the plurality of electrodes 1X is disposed on the surface of the substrate 11 on the viewer side, and is covered with an insulating film 12 formed on the upper layer.
The first portion 1a of the electrode 1X intersects the first portion 2a of the electrode 2Y in a plan view, and two adjacent second portions 1b across the first portion 2a are connected to the first portion 1a of the electrode 1X and the electrode. They are electrically and mechanically connected via contact holes 12a formed in the insulating film 12 which is an interlayer insulating film between 2Y.
That is, each of the plurality of electrodes 1X is formed in a conductive layer different from the electrode 2Y, and the first portion 1a intersecting with the electrode 2Y is separated from the electrode 2Y and formed in the same conductive layer as the electrode 2Y. The first portion 1a of the electrode 1X is connected to the second portion of the electrode 1X through a contact hole 12a formed in the insulating film 12 between the first portion 1a and the electrode 2Y. It is electrically connected to 1b.

The second part 2b of the electrode 2Y is disposed between the first parts 1a when viewed in plan in the two adjacent electrodes 1X. The second portion 1b of the electrode 1X is disposed between the first portions 2a of the two adjacent electrodes 2Y when viewed in plan.
That is, the electrode 2Y has a width 2b wider than the width (2a) of the portion (2a) intersecting the electrode 1X between the electrodes 1X, and the electrode 1X has a width of the portion 1a intersecting the electrode 2Y between the electrodes 2Y. Has a portion 1b having a wider width.
When viewed in a plan view, the touch panel 20 includes a central region in which the plurality of electrodes 2Y and 1X are disposed, and a peripheral region disposed around the central region. In the peripheral region of the touch panel 20, as shown in FIG. 1, a plurality of wirings 5 electrically connected to each of the plurality of electrodes 2Y and a plurality of electrodes electrically connected to each of the plurality of electrodes 1X. Wiring 5 is arranged. Each of the plurality of wirings 5 is a wiring that electrically connects each of the plurality of electrodes 2Y and the plurality of electrodes 1X and the touch position control circuit.

The central area of the touch panel 20 is arranged corresponding to the display area of the liquid crystal display panel 30, and the peripheral area of the touch panel 20 is arranged corresponding to the non-display area of the liquid crystal display panel 30. That is, the plurality of electrodes 1X and 2Y of the touch panel 20 are disposed in a region facing the display region of the liquid crystal display panel 30, and the plurality of wirings 5 are disposed in a region facing the non-display region of the liquid crystal display panel 30. Yes.
As shown in FIGS. 3 and 4, each of the plurality of wirings 5 is disposed on the surface (main surface) on the viewer side of the substrate 11 and is covered with an insulating film 12 formed in an upper layer thereof. Each of the plurality of wirings 5 has a corresponding electrode (electrode) at the end of each electrode (electrode 1X, electrode 2Y) via a contact hole 12b formed in the insulating film 12, as shown in FIGS. 1X, electrode 2Y).
Each of the plurality of electrodes 1X and the plurality of electrodes 2Y is made of a transparent material such as ITO (Indium Tin Oxide) having high transparency. Each of the plurality of wirings 5 has, for example, a two-layer structure made of different conductive materials. For example, the transparent conductive film (for example, ITO) in the same layer as the first portion 1a of the electrode 1X, and the transparent conductive film It has a two-layer structure with a conductive metal film formed thereon and having a resistance value lower than that of the transparent conductive film.

As shown in FIGS. 1 to 5, the touch panel 20 includes a shielding conductor 3. The shielding conductor 3 is disposed on the surface (main surface) of the substrate 11 on the viewer side, and is covered with an insulating film 12 formed thereon.
The shield conductor 3 is formed in the same layer as the first portion 1a of the electrode 1X, and is formed of a highly transparent material, for example, a transparent conductive material such as ITO (Indium Tin Oxide). The first portions 1a of the plurality of electrodes 1X and the shielding conductor 3 are formed by patterning the same conductive film.

The shield conductor 3 is disposed in the central region of the touch panel 20 so as to cover a plurality of electrodes (electrode 1X, electrode 2Y) when viewed in plan. The shielding conductor 3 has a plurality of openings 4 as shown in FIGS. The plurality of openings 4 include an opening 4a in which the first portion 1a of the electrode 1X is disposed in the opening, and an opening 4b in which the first portion 1a of the electrode 1X is not disposed in the opening. The first portion 1a is formed in the opening 4a of the conductor 3 for shielding. In other words, the shielding conductor 3 according to the first embodiment is formed of the same conductive layer as the first portion 1a of the electrode 1X, separated from the first portion 1a of the electrode 1X.
In the first embodiment, for example, the conductors 3 for shielding extend in the third direction, and are arranged in parallel at a predetermined pitch in a fourth direction orthogonal to the third direction. A plurality of pieces 3a and a plurality of pieces 3b each extending in the fourth direction intersecting with the third direction and arranged in parallel at a predetermined pitch in the third direction. Each of the opening 4a and the opening 4b is an opening formed by the piece 3a and the piece 3b constituting the mesh shape.
In the first embodiment, the planar shape of each of the second portions (1b, 2b) of the electrode 1X and the electrode 1Y is, for example, as shown in FIGS. 1 and 2, for example, each of the first portions (1a, 2a). The second portion 1b of the electrode 1X and the second portion 2b of the electrode 2Y have an acute angle with respect to the first direction (for example, the X direction). As shown in FIG. 5, the shield conductor 3 is arranged in a state (inclined state), and as shown in FIG. 5, one piece 3a and the other piece 3b constituting the mesh shape are connected to the electrode 1X. The second portion 1b and the second portion 2b of the electrode 2Y are formed in a shape along each side facing each other. The second portion 1b of the electrode 1X and the second portion 2b of the electrode 2Y are arranged in a state where each side facing each other forms an angle of 45 degrees, for example, with respect to the first direction (X direction) (inclined state). The one piece 3a constituting the mesh shape extends at an angle of 45 degrees clockwise with respect to the first direction (X direction), for example, and the other piece 3b constituting the mesh shape is, for example, the first piece 3a It extends at an angle of 45 degrees counterclockwise with respect to the direction (X direction).
In the first embodiment, the shield conductor 3 has a shape in which one piece 3a and the other piece 3b constituting the mesh shape are arranged between the first portions 1a of two adjacent electrodes 1X. In other words, the shape is such that one piece 3a and the other piece 3b constituting the mesh shape cross between the first portions 1a of two adjacent electrodes 1X.

  The touch panel 20 according to the first embodiment is disposed on the liquid crystal display panel 30 so that the surface of the substrate 11 opposite to the surface on the viewer side faces the surface on the viewer side of the liquid crystal display panel 30, and is shielded. The electrical conductor 3 is disposed between the liquid crystal display panel 30 and the central region where the plurality of electrodes (electrode 1X, electrode 2Y) of the touch panel 20 are disposed. The shield conductor 3 receives a predetermined signal and reduces noise from the liquid crystal display panel 30 to the touch panel 20. The shielding conductor 3 according to the first embodiment is electrically connected to a wiring whose potential is fixed to, for example, a reference potential (for example, 0 V) among power supply potentials used in a display device with a touch panel.

As shown in FIGS. 1 to 4, the touch panel 20 includes a shielding conductor 6 in addition to the shielding conductor 3. The shield conductor 6 is disposed on the insulating film 12 and is covered with a protective film 13 formed thereon.
The shield conductor 6 is formed in the same layer as the second portion 1b of the electrode 1X and the electrode 2Y, and is formed of a highly transparent material, for example, a transparent conductive material such as ITO (Indium Tin Oxide). . The second portions 1b of the plurality of electrodes 1X, the plurality of electrodes 2Y, and the conductor for shielding 6 are formed by patterning the same conductive film.
The shield conductor 6 is arranged in the peripheral region of the touch panel 20 so as to cover the plurality of wirings 5 when viewed in plan. The shield conductor 6 is formed of the same conductive layer as the second conductor 1b of the electrode 1X and the electrode 2Y.
The shield conductor 6 receives a predetermined signal and reduces noise from the observer side to the touch panel 20. The shielding conductor 6 according to the first embodiment is electrically connected to a wiring whose potential is fixed to, for example, a reference potential (for example, 0 V) among power supply potentials used in a display device with a touch panel.
In FIG. 6, it is schematically shown that C1 and C3 capacitances are formed between the observer's finger 50 and the electrode 1X, and C2 capacitances are formed between the observer's finger 50 and the electrode 2Y. Show. The touch panel 20 according to the present embodiment detects a touch position coordinate on the touch surface of the touch panel 20 touched by the observer's finger 50 by detecting a capacitance difference in the coupling capacitance between the electrode 1X and the electrode 2Y.

Next, a method for manufacturing the touch panel 20 according to the first embodiment will be described with reference to FIGS.
First, a first transparent conductive film made of a transparent conductive material (for example, ITO) is formed on the surface of the substrate 11 on the viewer side.
Next, a first mask having an electrode pattern, a shielding conductor pattern, and a wiring pattern is formed on the first transparent conductive film using, for example, a positive resist, and then the first mask is formed. By using the mask as an etching mask and etching the first transparent conductive film, the first portion 1a of the electrode 1X, the conductor 3 for shielding, and the wiring lower layer pattern are formed on the substrate 11. The shield conductor 3 includes a plurality of openings including an opening 4a in which the first portion 1a of the electrode 1X is formed in the opening and an opening 4b in which the first portion 1a of the electrode 1X is not formed in the opening. 4 and the first portion 1a of the electrode 1X is formed in the opening 4 of the conductor 3 for shielding.
Next, the first mask is removed, and then an upper wiring layer pattern made of, for example, a conductive metal material is selectively formed on the lower wiring layer pattern. Thereby, the wiring 5 having a two-layer structure composed of the wiring lower layer pattern and the wiring upper layer pattern is formed.
Next, an insulating film 12 made of, for example, a negative resist is formed on the substrate 3 including the conductor 3 for shielding, the first portion 1a of the electrode 1X, and the wiring 5. In this step, the shielding conductor 3, the first portion 1a of the electrode 1X, and the wiring 5 are covered with the insulating film 12.
Next, a contact hole 12a and a contact hole 12b are formed in a necessary portion of the insulating film 12, and then a transparent conductive material (for example, ITO) is formed on the insulating film 12 including the inside of the contact hole 12a and the inside of the contact hole 12b. A second transparent conductive film is formed.

Next, a second mask having an electrode pattern and a shield conductor pattern is formed on the second transparent conductive film using, for example, a positive resist, and then the second mask is used as an etching mask. And the second conductive film is etched to form the second portion 1b of the electrode 1X, the electrode 2Y, and the shield conductor 6 on the insulating film 12. In this step, the upper second portion 1b is electrically and mechanically connected to the lower first portion 1a through the contact hole 12a. The lower first portion 1a intersects the upper electrode 2Y first portion 1a. The ends of the electrode 1X and the electrode 2Y are electrically and mechanically connected to the corresponding lower-layer wiring 5 through the contact holes 12b.
Next, the second mask is removed, and then the protective film 13 made of, for example, a negative resist is formed on the insulating film 12 including the second portion 1b of the electrode 1X, the electrode 2Y, and the conductor 6 for shielding. By forming the structure, the structure shown in FIGS. 1 to 5 is obtained. In this step, the second portion 1b of the electrode 1X, the electrode 2Y, and the shielding conductor 6 are covered with the protective film 13.

By the way, in the conventional capacitive coupling type touch panel, as shown in FIGS. 16 to 18, the plurality of electrodes 1 </ b> X and the plurality of electrodes 2 </ b> Y are formed on different conductive layers (lower layer and upper layer) through the insulating film 12. Is formed. In the case of such an electrode structure, the protective film 13 formed on the insulating film 12 and the upper electrode 1X is distorted by the upper electrode 1X. Since the optical path length differs between the upper layer, a color difference occurs between the lower electrode 2Y and the upper electrode 1X, and the electrode patterns of the electrode 1X and the electrode 2Y become obvious.
On the other hand, in the capacitively coupled touch panel 20 of the present embodiment, as shown in FIGS. 1 to 4, the electrode 1X is formed in a layer different from the electrode 2Y so as to intersect the electrode 2Y. The first portion 1a has a second portion 1b formed separately from the electrode 2Y in the same layer as the electrode 2Y. The first portion 1a is an insulating film between the first portion 1a and the electrode 2Y. 12 is connected to the second portion 1b through a contact hole 12a.
In the case of such an electrode structure, since the protective film 13 can have a uniform film formation surface, distortion generated in the protective film 13 can be suppressed, and the electrode pattern resulting from the color difference due to the distortion of the protective film 13 can be realized. Can be suppressed. As a result, it is possible to suppress the deterioration of the optical characteristics due to the actualization of the electrode pattern, and thus it is possible to suppress the deterioration of the characteristics of the display device incorporating the touch panel 20.
In addition, since the portion where the color difference occurs can be minimized, that is, only the first portion 1a of the electrode 1X, it is possible to suppress the manifestation of the electrode pattern caused by the color difference due to the optical path difference. As a result, it is possible to suppress the deterioration of the optical characteristics due to the actualization of the electrode pattern, and thus it is possible to suppress the deterioration of the characteristics of the display device incorporating the touch panel 20.

Further, in the conventional capacitive coupling type touch panel, as shown in FIGS. 17 and 18, a shielding conductor 15 is provided on the surface of the substrate 11 opposite to the surface on the observer side. In the case of such a structure, the shielding conductor 15 is formed on the transparent conductive material layer for forming the electrode 1X and the transparent conductive material layer for forming the electrode 2Y as the transparent conductive material layer. Therefore, three transparent conductive material layers to which the transparent conductive material layer is added are necessary, which becomes a factor that hinders cost reduction.
On the other hand, in the capacitive coupling type touch panel 20 of this embodiment, as shown in FIGS. 1 to 5, the shielding conductor 3 is a transparent conductive layer in the same layer as the first portion 1a of the electrode 1X. It is formed of a film. The shielding conductor 3 has an opening 4a in a region where the first portion 1a of the electrode 1X is formed, and the first portion 1a of the electrode 1X has an opening formed in the shielding conductor 3. It is formed in the part 4a.
By adopting such an electrode structure, the electrode 1X, the electrode 2Y, and the shield conductor 3 for reducing noise from the liquid crystal display panel 30 to the touch panel 20 are configured by two transparent conductive material layers. Since the material and process which concern on a transparent conductive material layer can be omitted compared with the conventional touch panel, a touch panel can be manufactured more cheaply. Thereby, cost reduction of the display apparatus with a touch panel incorporating a touch panel can be achieved.

  Further, in the touch panel 20 according to the first embodiment, as shown in FIGS. 1 to 4, the shield conductor 6 is formed on the insulating film 12 so as to cover the plurality of wirings 5 and receives a predetermined signal. have. In this embodiment, 0V is input to the shielding conductor. The type of signal input to the conductor used for the shield does not regulate the gist of the present invention and may be other signals. The shield conductor 6 is formed on the first conductive layer 1a of the electrode 1X and the transparent conductive layer in the same layer as the electrode 2Y. With such a structure, noise from the observer side to the touch panel can be reduced by the shielding conductor 6, and the electrode 1X, the electrode 2Y, and the shield to reduce noise from the observer side to the touch panel 20 can be reduced. Therefore, the touch panel can be manufactured at a low cost.

Here, the noise from the liquid crystal display panel 30 to the touch panel 20 can be reduced by providing the shielding conductor 3 between the substrate 11 and the electrodes 1X and 2Y as in the first embodiment. However, since the distance between the electrode 1X and the electrode 2Y and the shielding conductor 3 is only about several μm, a capacitance is generated between the electrode 1X and the electrode 2Y and the shielding conductor 3. Since this capacitance may adversely affect the operation of the capacitive touch panel, it is desirable to make it as small as possible.
Therefore, the shielding conductor 3 according to the first embodiment has an opening 4a in which the first portion 1a of the electrode 1X is formed in the opening. Further, separately from the opening 4a, the electrode 1X is formed in the opening. There is also an opening 4b in which the first portion 1a is not formed. By adopting such a conductor structure, the capacity generated between the electrode 1X and the electrode 2Y and the shield conductor 3 can be reduced, so that a display device with a touch panel having high reliability and excellent noise resistance can be obtained. It can be provided at low cost.

  The capacitance generated between the electrode 1X and the electrode 2Y and the shielding conductor 3 is the number and size of the opening 4b in which the first portion 1a of the electrode 1X is not formed in the opening, that is, per unit area. Although it is reduced by increasing the non-conductor region, the capacitance generated between the electrodes 1X and 2Y and the shielding conductor 3 and the shielding effect by the conductor 3 are in a trade-off relationship. The number and size of the openings 4b are preferably determined in consideration of the shielding effect. The number and size of the openings 4b are determined by the number of one and the other pieces (3a, 3b) constituting the mesh shape that cross between the first portions 1a of the two adjacent electrodes 1X (the two adjacent electrodes 1X The number of one and the other pieces (3a, 3b) constituting the mesh shape between the first portions 1a) can be defined, so that the shield conductor 3 is the same as that of the first embodiment. Thus, between the first portions 1a of the two adjacent electrodes 1X, at least one mesh and the other piece (3a, 3b) crossing each other cross each other (the first portion of the two adjacent electrodes 1X) It is desirable that a mesh shape in which at least one of the one and the other pieces (3a, 3b) intersecting each other is arranged between 1a.

FIG. 7 is a cross-sectional view showing a cross-sectional structure of a touch panel which is a modification of the first embodiment of the present invention.
The touch panel 20 of the present modification has basically the same configuration as that of the first embodiment, and the following configuration is different.
That is, as shown in FIG. 7, the touch panel 20 of this modification has a front panel 14 formed on the protective film 13. Also in such a touch panel 20, the same effect as in the first embodiment can be obtained.

[Example 2]
8 to 12 are diagrams related to a display device with a touch panel according to a second embodiment of the present invention.
FIG. 8 is a plan view showing an electrode pattern of a touch panel incorporated in a display device with a touch panel,
FIG. 9 is an enlarged plan view of a part of FIG.
10 is a view showing a cross-sectional structure of the touch panel of FIG. 8 ((a) is a cross-sectional view taken along the line DD ′ of FIG. 8, (b) is a cross-sectional view in which a part of (a) is enlarged),
11 is a view showing a cross-sectional structure of the touch panel of FIG. 8 ((a) is a cross-sectional view taken along the line EE ′ of FIG. 8, (b) is a cross-sectional view in which a part of (a) is enlarged),
FIG. 12 is a block diagram illustrating a schematic configuration of a display device with a touch panel.

The display device with a touch panel according to the second embodiment basically has the same configuration as that of the first embodiment described above, and the following configuration is different.
That is, in the first embodiment, as shown in FIGS. 1 to 4, the first portion 1a of the electrode 1X and the shielding conductor 3 are formed in the lower conductive layer, and the upper conductive layer is further formed. Although the example in which the second portion 1b of the electrode 1X, the electrode 2Y, and the shielding conductor 6 are formed in the layer has been described, in the second embodiment, as shown in FIGS. The second portion 1b of the electrode 1X and the electrode 2Y (2a, 2b) are formed in the layer, and the first portion 1a of the electrode 1X and the shielding conductor 3 are formed in the upper conductive layer. ing.
The second portions 1b of each of the plurality of electrodes 1X, the plurality of electrodes 2Y, and the plurality of wirings 5 are formed on the main surface of the substrate 11 and covered with an insulating film 12 formed on the upper layer thereof. Each of the first portions 1a of the plurality of electrodes 1X and the conductor 3 for shielding are formed on the insulating film 12, and are covered with a protective film 13 formed on these layers.
The first portion 1a (upper layer in this embodiment) of the electrode 1X intersects the first portion 2a of the electrode 2Y in a plan view, and two adjacent second portions 1b (this embodiment) sandwiching the first portion 2a. Are electrically and mechanically connected to each other via contact holes 12a formed in the insulating film 12 which is an interlayer insulating film between the first portion 1a of the electrode 1X and the electrode 2Y.
The shield conductor 3 is formed in the central region and the peripheral region of the touch panel 20 so as to cover the second portions 1b, the plurality of electrodes 2Y, and the plurality of wirings 5 of each of the plurality of electrodes 1X.

As shown in FIG. 12, the touch panel 20 of the second embodiment is arranged on the liquid crystal display panel 30 so that the surface of the substrate 11 on the protective film 13 side faces the surface of the liquid crystal display panel 30 on the viewer side. In addition, the conductor 3 for shielding is disposed between the liquid crystal display panel 30 and the central region and the peripheral region of the touch panel 20. The shield conductor 3 receives a predetermined signal and reduces noise from the liquid crystal display panel 30 to the touch panel 20.
In the second embodiment as well, the manifestation of the electrode pattern caused by the color difference due to the distortion of the protective film 13 and the manifestation of the electrode pattern caused by the color difference due to the optical path difference can be suppressed. Deterioration can be suppressed, and deterioration in characteristics of a display device incorporating the touch panel 20 can be suppressed.
In addition, the electrode 1X, the electrode 2Y, and the shield conductor 3 for reducing noise from the liquid crystal display panel 30 to the touch panel 20 can be configured by two layers of transparent conductive material layers. Since the material and process which concern on a transparent conductive material layer can be omitted compared with, a touch panel can be manufactured more inexpensively. Thereby, cost reduction of the display apparatus with a touch panel incorporating a touch panel can be achieved.
Also in the second embodiment, the shielding conductor 3 has an opening 4a in which the first portion 1a of the electrode 1X is formed in the opening, as in the first embodiment, and this opening 4a. Apart from this, it also has an opening 4b in which the first portion 1a of the electrode 1X is not formed. Also in the second embodiment, similarly to the first embodiment, since the capacitance generated between the electrode 1X and the electrode 2Y and the conductor 3 for shielding can be reduced, the reliability is high and the noise resistance is excellent. A display device with a touch panel can be provided at low cost.

[Example 3]
FIG.13 and FIG.14 is a figure which concerns on the touchscreen integrated in the display apparatus with a touchscreen which is Example 3 of this invention,
FIG. 13 is a plan view showing an electrode pattern of a touch panel,
FIG. 14 is a plan view showing a conductor pattern for shielding in FIG.
The display device with a touch panel according to the third embodiment has basically the same configuration as that of the first embodiment described above, and the configuration of the conductor 3 for shielding is different.
That is, the shielding conductor 3 of the first embodiment described above has a mesh shape in which one piece 3a and the other piece 3b intersect each other between the first portions 1a of two adjacent electrodes 1X. It has become.
On the other hand, as shown in FIGS. 13 and 14, the shielding conductor 3 according to the third embodiment has one piece 3a crossing each other between the first portions 1a of two adjacent electrodes 1X. The other piece 3b has a mesh shape that crosses two by two. In the third embodiment, the width of each of the one and other pieces (3a, 3b) is, for example, about 20 μm, and the width of each of the openings 4a, 4b is, for example, about 200 μm.
In the third embodiment in which the shielding conductor 3 is configured as described above, the same effect as in the first embodiment can be obtained.
In addition, it cannot be overemphasized that the mesh pattern shape of the conductor 3 for a shield in this Example 3 is applicable also to the modification of Example 1 and Example 2 mentioned above.

[Example 4]
FIG. 15: is a top view which shows the conductor pattern for the shield of the touchscreen integrated in the display apparatus with a touchscreen which is Example 4 of this invention.
The display device with a touch panel of the fourth embodiment has basically the same configuration as that of the first embodiment described above, and the configuration of the conductor 3 for shielding is different.
That is, the conductor 3 for shielding of the above-described first embodiment has a mesh shape in which one piece 3a and the other piece 3b intersecting each other cross between the first portions 1a of two adjacent electrodes 1X. Yes.
On the other hand, as shown in FIG. 15, the conductor 3 for shielding according to the fourth embodiment is not a mesh shape but simply a pattern shape in which a plurality of openings 4a and openings 4b are dotted. .
In the fourth embodiment in which the shielding conductor 3 is configured as described above, the same effect as in the first embodiment can be obtained.
In addition, it cannot be overemphasized that the pattern shape of the conductor 3 for a shield in this Example 4 is applicable also to the modification of Example 1 mentioned above and Example 2. FIG.

In the above-described embodiments (1, 2, 3, 4) and modifications, the example in which the first portion 1a and the second portion 1b of the electrode 1X are formed of different conductive layers has been described. It goes without saying that the case where the first portion 2a and the second portion 2b of the electrode 2Y are formed of different conductive layers is also included.
In the above-described embodiments (1, 2, 3, 4) and modifications, the display device with a touch panel provided with a touch panel on the liquid crystal display panel has been described as an example of the display panel, but the present invention is limited to this. The present invention can be applied to a display device with a touch panel provided with a touch panel on another display panel such as an organic EL display panel or an inorganic EL display panel.
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.

1X electrode 1a 1st part 1b 2nd part 2Y electrode 2a 1st part 2b 2nd part 3 Shielding conductor 3a, 3b piece 4, 4a, 4b Opening 5 wiring 6 Shielding conductor 11 Substrate 12 Insulating film 12a, 12b Contact hole 13 Protective film 14 Front panel 15 Conductor for shielding 20 Touch panel 30 Liquid crystal display panel 40 Backlight

Claims (14)

A substrate,
A first conductor for shielding formed on the first surface of the substrate;
An insulating film formed on the first conductor for shielding;
A plurality of first electrodes formed on the insulating film, extending in a first direction and juxtaposed in a second direction intersecting the first direction;
A capacitively coupled touch panel formed on the insulating film and having a plurality of second electrodes arranged in parallel in the first direction extending in the second direction and intersecting the second direction. There,
A predetermined signal is input to the first conductor for shielding,
Each of the plurality of first electrodes includes a first portion formed on the first surface of the substrate and a second portion formed separately from the second electrode on the insulating film. Have
The first portion is connected to the second portion through a contact hole formed in the insulating film,
The first conductor for shielding has a plurality of openings,
The plurality of openings include a first opening in which the first portion is formed in the opening, and a second opening in which the first portion is not formed in the opening,
The capacitive coupling type touch panel, wherein the first portion is formed in the first opening. The first conductor for shielding has a mesh shape composed of a first piece and a second piece intersecting each other,
2. The electrostatic according to claim 1, wherein each of the first opening and the second opening is an opening formed by the first piece and the second piece constituting the mesh shape. Capacitive coupling type touch panel. The second electrode includes a first portion that intersects the first portion of the first electrode in a plane, and a second portion that continues to the first portion,
The second portion of the first electrode is formed in a square shape having a wider planar shape than the first portion of the first electrode,
The second portion of the second electrode is formed in a square shape having a wider planar shape than the first portion of the second electrode,
The second portion of the first electrode and the second portion of the second electrode are arranged in a state where each side facing each other forms an acute angle with respect to the first direction;
The mesh-shaped first piece and the second piece of the first conductor for shielding are along each side of the second portion of the first electrode and the second portion of the second electrode facing each other. 3. The capacitively coupled touch panel according to claim 2, wherein the touch panel is formed.   Between the first portions of the two adjacent first electrodes, at least one of the mesh-shaped first piece and second piece of the first conductor for shielding is disposed. The capacitively coupled touch panel according to claim 3. A plurality of first electrodes and a plurality of second electrodes formed around a region where the plurality of first electrodes and the plurality of second electrodes are formed and electrically connected to each of the plurality of first electrodes or the plurality of second electrodes; Have wiring,
The plurality of wirings are formed on the first surface of the substrate,
2. The capacitively coupled touch panel according to claim 1, further comprising a second conductor for shielding, which is formed so as to cover the plurality of wirings on the insulating film and receives a predetermined signal. .   6. The capacitively coupled touch panel according to claim 1, further comprising a protective film formed on the plurality of first electrodes and the plurality of second electrodes. 7.   7. The capacitively coupled touch panel according to claim 6, further comprising a front panel formed on the protective film. A substrate,
A plurality of first electrodes formed on a second surface of the substrate, extending in a first direction and juxtaposed in a second direction intersecting the first direction;
A plurality of second electrodes formed on the second surface of the substrate, extending in the second direction and juxtaposed in the first direction intersecting the second direction;
An insulating film formed on the plurality of first electrodes and the plurality of second electrodes;
A capacitively coupled touch panel having a shielding conductor formed on the insulating film,
A predetermined signal is input to the shielding conductor,
Each of the plurality of first electrodes includes a first portion formed on the insulating film and a second portion formed separately from the second electrode on the second surface of the substrate. Have
The first portion is connected to the second portion through a contact hole formed in the insulating film,
The shield conductor has a plurality of openings,
The plurality of openings include a first opening in which the first part is formed in the opening, and a second opening in which the first part is not formed in the opening,
The capacitive coupling type touch panel, wherein the first portion is formed in the first opening. The shield conductor comprises a mesh shape composed of a first piece and a second piece intersecting each other,
9. The electrostatic according to claim 8, wherein each of the first opening and the second opening is an opening formed by the first piece and the second piece constituting the mesh shape. Capacitive coupling type touch panel. The second electrode includes a first portion that intersects the first portion of the first electrode in a plane, and a second portion that continues to the first portion,
The second portion of the first electrode is formed in a square shape having a wider planar shape than the first portion of the first electrode,
The second portion of the second electrode is formed in a square shape having a wider planar shape than the first portion of the second electrode,
The second portion of the first electrode and the second portion of the second electrode are arranged in a state where each side facing each other forms an acute angle with respect to the first direction;
The mesh-shaped first piece and second piece of the shielding conductor are formed in a shape along each side of the second portion of the first electrode and the second portion of the second electrode facing each other. 10. The capacitively coupled touch panel according to claim 9, wherein the touch panel is a capacitively coupled touch panel.   The at least one first piece and the second piece of the conductor for shielding are arranged between the first portions of the two adjacent first electrodes. 10. The capacitively coupled touch panel according to 10. A plurality of first electrodes and a plurality of second electrodes formed around a region where the plurality of first electrodes and the plurality of second electrodes are formed and electrically connected to each of the plurality of first electrodes or the plurality of second electrodes; Have wiring,
The plurality of wirings are formed on the second surface of the substrate,
9. The capacitively coupled touch panel according to claim 8, wherein the shield conductor is formed so as to cover the plurality of wirings.   13. The capacitively coupled touch panel according to claim 8, further comprising a protective film formed on the plurality of first electrodes and the plurality of second electrodes.   14. The capacitively coupled touch panel according to claim 1, wherein the plurality of first electrodes and the plurality of second electrodes are made of a transparent conductive film. .

Images