KR20150108644A - Touch panel - Google Patents

Abstract

The present invention relates to a touch panel. The touch panel according to an embodiment of the present invention includes: a sensing electrode formed on a substrate; at least one wiring electrically connected to the sensing electrode; and a shield unit formed between an external unit of the substrate, and the sensing electrode.

Description

TOUCH PANEL {TOUCH PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel, and more particularly, to a touch panel capable of preventing foreign matter (e.g., moisture) from penetrating into a display device including a touch panel or a touch panel.

2. Description of the Related Art In electronic devices such as a personal digital assistant (PDA), a notebook computer, an OA device, a medical device or a car navigation system, a touch panel for detecting touch input using a human hand or an object, .

[0003] As a representative method in which a touch panel senses a touch input from the outside, a capacitive type, a resistive type, an electromagnetic induction type, and an optical type are known. Recently, a capacitive type is widely used.

[0004] Both the touch panel for sensing the touch input and the electronic device equipped with the touch panel through the above-described various methods include a large number of electronic components that are vulnerable to exposure to foreign substances (particularly, moisture, salinity) Blocking the penetration of foreign substances is one of the most important factors to consider.

For example, when the sensing electrodes included in the touch panel are exposed to moisture or salinity, corrosion may occur, and short-circuit or signal errors may occur between the electrodes due to such corrosion.

That is, in a touch panel in which rapid input sensing is important, a significant deterioration in quality and performance due to penetration of external foreign matter may cause a fatal problem.

Korean Patent Publication No. 10-2013-0025769 (Mar. 13, 2013)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a touch panel, And to provide a touch panel and an image display device excellent in penetration prevention performance.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

According to an aspect of the present invention, there is provided a touch panel including a sensing electrode formed on a substrate, at least one wiring electrically connected to the sensing electrode, and a shield formed between the edge of the substrate and the wiring .

The shield may be made of at least one insulating material.

The plasma display apparatus according to claim 1, further comprising a ground line formed on one side of the wiring and to which a ground power is applied, the shield being disposed between an edge of the substrate and an edge of the substrate, .

The substrate may include a first substrate and a second substrate, and the wiring and the shield may be disposed on at least one of the first substrate and the second substrate.

Also, the substrate may include a first substrate and a second substrate, the wiring may be formed on the first substrate or the second substrate, the shield may include a first shield and a second shield formed on the first substrate, And a second shielding part formed on the second substrate, wherein the first shielding part and the second shielding part are arranged alternately.

In addition, the shielding portion may have a thickness of 5 탆 or more and 15 탆 or less, or a width of 0.09 mm or more and 0.11 mm or less.

According to an embodiment of the present invention, a touch panel and an image display device having an excellent penetration prevention performance against foreign substances can be provided by forming a shielding portion in a shape surrounding a part such as a sensing electrode at the edge of the touch panel.

Further, in the touch panel manufacturing process, a shielding portion is formed by a screen printing technique or the like, so that a touch panel having waterproof performance can be easily secured.

Further, by integrating the touch panel and the shielding portion, the resistance against the application of the external impact can be improved and the foreign matter blocking performance can be maintained.

1 is a view illustrating a touch panel according to a first embodiment of the present invention.
2 is a cross-sectional view illustrating a portion of a touch panel cut along a line A-A 'in FIG.
3 is a view illustrating a touch panel according to a second embodiment of the present invention.
4 is a cross-sectional view illustrating a portion of a touch panel cut along a line B-B 'in FIG.
5 is a view illustrating a touch panel according to a third embodiment of the present invention.
6 is a cross-sectional view illustrating a portion of a touch panel cut along a line C-C 'in FIG.
7 is a view illustrating a touch panel according to a fourth embodiment of the present invention.
8 is a cross-sectional view showing a part of the touch panel cut along line D-D 'in FIG.
9 is a view illustrating a touch panel according to a fifth embodiment of the present invention.
10 is a cross-sectional view showing a part of a touch panel cut along the line E-E 'in FIG.

The embodiments disclosed herein should not be construed or interpreted as limiting the scope of the present invention. It will be apparent to those of ordinary skill in the art that the description including the embodiments of the present specification has various applications. Accordingly, it is intended that the scope of the invention be limited not by the claims, but rather by the appended claims, rather than by the claims. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view illustrating a touch panel according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a portion of a touch panel cut along a line A-A 'in FIG.

Referring to FIGS. 1 and 2, a touch panel according to a first embodiment of the present invention includes a sensing electrode 20, a wiring 30, and a shielding portion 40.

At least one or more detection electrodes 20 may be formed on the substrate 10.

The substrate 10 may be formed of a transparent film to which a material for forming the sensing electrode 20 can be applied, PET (polyethylene terephthalate), PC (polycarbonate), PES (polyether sulfone), PI (polymide), PMMA Glass, and the like.

The sensing electrode 20 is provided in the touch active area and can sense a touch input by a person or an object. In the present invention, the touch active area means an area where a user's touch command can be input. The term "touch inactive area" refers to an area opposite to the touch active area, which is not activated even when a user touches the touch area, and thus the touch command is not input. Here, the touch active area may be the same as the screen area, but it is not limited thereto, and it should be construed to mean an area that can be extended to a part or all of the non-screen area in addition to a part or all of the screen area.

The sensing electrode 20 may be formed of at least one material selected from the group consisting of indium tin oxide (ITO), carbon nanotube (CNT), indium zinc oxide (IZO), zinc oxide (ZnO), graphene, ), Copper oxide, or the like.

The sensing electrode 20 may include a first sensing electrode 20a and a second sensing electrode 20b.

The first sensing electrode 20a and the second sensing electrode 20b may be formed using various methods such as etching, photolithography, sputtering, or screen printing. .

In this case, the first sensing electrode 20a and the second sensing electrode 20b may be patterned so as to intersect with each other, but it is not limited thereto and those skilled in the art can easily understand that the sensing electrode 20a and the second sensing electrode 20b can be patterned into various arrangements. For example, the first sensing electrode 20 may extract a coordinate component in a first direction (e.g., transverse direction) with respect to the touch input, and the second sensing electrode 20 may extract a coordinate component in a second direction E.g., in the longitudinal direction). Alternatively, each sensing electrode 20 may be formed to have a bar shape, a diamond shape, or the like.

One end of the wiring 30 is electrically connected to one end of the sensing electrode 20 and the other end of the wiring 30 is electrically connected to the sensing electrode 20. The other end of the wiring 30 is electrically connected to the sensing electrode 20, To the terminal portion. At this time, the number of the wirings 30 may be the same as the number of the sensing electrodes 20.

Specifically, the wiring 30 may include a plurality of first wirings 30a and a plurality of second wirings 30b, as shown in FIGS. At this time, one of the first wirings 30a may be electrically connected to one of the first sensing electrodes 20a, and one of the second wirings 30b may be electrically connected to one of the second sensing electrodes 20b .

Further, the wiring 30 is generally located in the touch inactive region, but in some cases, it may be located in the touch active region.

The wirings 30 may be formed of indium tin oxide (ITO), carbon nanotube (CNT), indium zinc oxide (IZO), zinc oxide (ZnO), graphene, A conductive polymer, silver nano wire, copper oxide, or the like may be used in the same manner. When the wiring 30 is located in a non-screen area, it may be a sufficiently transparent material (e.g., molybdenum, titanium, etc.) if it is formed of a conductive material.

The wiring 30 may be formed using various methods such as etching, photolithography, sputtering, or screen printing.

The shielding portion 40 can prevent external foreign substances such as moisture, salt, dust, and air from penetrating into the touch panel and damaging the components such as the sensing electrode 20 and the like.

Specifically, the shield 40 may be formed between the edge of the substrate 10 and the sensing electrode 20. That is, the shielding portion 40 is formed to surround the sensing electrode 20 between the edge of the substrate 10 and the sensing electrode 20 so that the sensing electrode 20 is exposed to the foreign material It serves as a blocking shield.

This shielding 40 may be made of one or more insulating materials. The shielding portion 40 may be formed of one or a combination of a variety of materials such as polycarbonate (PC) and polyethylene terephthalate (PET), which have a high resistance to moisture and sodium ions. The shielding portion 40 may be formed of ITO (Indium Tin Oxide), CNT (Carbon Nano Tube), IZO (Indium Zinc Oxide), ZnO (Zinc Oxide) A conductive member such as Graphene, conductive polymer, Ag nano wire, copper oxide, or the like may be used in the same manner.

The shielding portion 40 may be formed using various methods such as etching, photolithography, sputtering, or screen printing. At this time, the shielding portion 40 may be formed through the same process as the process of forming the sensing electrode 20 or the wiring 30, thereby simplifying the manufacturing process.

FIG. 3 is a view illustrating a touch panel according to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating a portion of a touch panel cut along a line B-B 'in FIG. The same reference numerals are used for the same components as those of the first embodiment described above with reference to Figs. 1 and 2, and a detailed description thereof will be omitted.

Referring to FIGS. 3 and 4, the touch panel according to the second embodiment of the present invention further includes a ground line 50. FIG.

The ground line (50) may be formed on one side of the wiring (30). That is, the ground line 50 may be formed between the sensing electrodes 20, or may be formed in one area such as a central portion or an outer portion of the substrate 10 with reference to the wiring 30. The ground line 50 may be supplied with a ground power to attenuate or block the noise generated in the sensing electrode 20 or the wiring 30. [ 4, the ground line 50 is formed on the same surface of the same substrate as the substrate on which the wiring 30 is formed. However, the present invention is not limited thereto and may be formed on the other surface of the same substrate, As shown in FIG.

Specifically, the ground line 50 is maintained at a ground level by receiving ground power, and electrostatic discharge introduced into the touch panel is discharged to the outside so that the electrical signal of the sensing electrode 20 can be precisely classified , It is possible to prevent the electrodes from being damaged by the instantaneous high current, thereby improving the reliability of the static electricity.

Further, the ground line 50 can be formed between the plurality of wirings 30, thereby attenuating or blocking the signal interference due to the coupling phenomenon occurring between the wirings 30, so that the touch input can be detected more accurately .

In this case, the ground line 50 may be formed using the same material as that used for forming the sensing electrode 20, the wiring 30, or the shielding portion 40. For example, the ground line 50 can be integrally patterned through the same process as the sensing electrode 20, the wiring 30, or the shield 40, thereby further simplifying the manufacturing process.

3 and 4, the shield 40 is closer to the edge of the substrate 10 of the wiring 30 and the ground line 50 than to the edge of the substrate 10, As shown in FIG. That is, the shielding portion 40 is formed so as to surround both the wiring line 30 and the grounding line 50 in order to block foreign matter from both the wiring line 30 and the grounding line 50.

FIG. 5 is a view illustrating a touch panel according to a third embodiment of the present invention, and FIG. 6 is a cross-sectional view illustrating a portion of a touch panel cut along a line C-C 'in FIG. The same reference numerals are given to the same components as those of the first and second embodiments described above with reference to Figs. 1 to 4, and a description thereof will be omitted.

The substrate 10 of the touch panel according to the third embodiment of the present invention includes a first substrate 10a and a second substrate 10b and the sensing electrode 20 or the wiring 30 includes a first substrate 10a ) Or on the second substrate 10b.

5 and 6, the first wiring 30a is formed on the first substrate 10a, the second wiring 30b is formed on the second substrate 10b, and the shielding portion 40 is formed on the second substrate 10b. The wirings 30a and 30b may be formed only on the first substrate 10a or only on the second substrate 10b and may be formed only on the first substrate 10a, The portion 40 may be formed on the second substrate 10b.

When all of the wirings 30 are formed only on one substrate 10a or 10b, the wirings 30 may be formed on the same or different surfaces of the substrate.

In this case, the shielding portion 40 may be formed on a substrate different from the substrate on which the sensing electrode 20, the first wiring 30a, or the second wiring 30b are formed. For example, FIG. 6 illustrates that the shield 40 may be formed on a substrate 10a different from the substrate 10b on which the second wires 30b are formed.

In this case, the fact that two of the sensing electrodes 20, the wirings 30, or the shielding portions 40 are formed on one substrate means that they are formed on the same surface of the substrate or formed on different surfaces, respectively . At this time, an adhesive material layer such as optical clear adhesive (OCA) may be formed between the first substrate 10a and the second substrate 10b.

When the sensing electrode 20, the wiring 30 and the shielding portion 40 are formed on one and the same substrate, the thickness of the touch panel is reduced. However, the pattern is complicated, have. In this case, it is advantageous in that the blocking effect of the shielding part 40 can be maintained while reducing the complexity of the pattern according to the simultaneous implementation on one substrate, by forming each on two or more different substrates.

FIG. 7 is a view illustrating a touch panel according to a fourth embodiment of the present invention, and FIG. 8 is a cross-sectional view illustrating a portion of a touch panel cut along the line D-D 'in FIG. The same reference numerals are used for the same components as those of the first to third embodiments described above with reference to Figs. 1 to 6, and a detailed description thereof will be omitted.

A plurality of shielding portions 40a and 40b may be sequentially arranged in order to more effectively block foreign substances such as a water portion penetrating into the touch panel.

The substrate of the touch panel according to the fourth embodiment of the present invention includes the first substrate 10a and the second substrate 10b like the third embodiment and the sensing electrode 20 or the wiring 30 1 substrate 10a or the second substrate 10b.

In this case, the shielding portions 40a and 40b may be formed on the first substrate 10a and the second substrate 10b such that a plurality of the shielding portions 40a and 40b are engaged with each other. 7 and 8, a first shielding portion 40a is formed on the upper surface of the first substrate 10a and a second shielding portion 40b is formed on the lower surface of the second substrate 10b. , And the first shielding portion 40a and the second shielding portion 40b may be alternately arranged. More concretely, a plurality of second shielding portions 40b are disposed on the lower surface of the second substrate 10b to form concave and convex shapes (e.g., concave and convex) between the plurality of second shielding portions 40b, The first shielding portion 40a may be interposed in the concave space formed between the second shielding portions 40b.

7 and 8, two shielding portions 40a and 40b are formed on the first substrate 10a and one shielding portion 40b is formed on the second substrate 10b. However, the present invention is not limited thereto, May be formed on the first substrate 10a and the second substrate 10b, respectively.

In this case, the shielding portions 40a and 40b may be formed on one surface of the substrate facing each other. For example, when the second substrate 10b is placed on the first substrate 10a, 40 may be formed on the upper surface of the first substrate 10a and the lower surface of the second substrate 10b, respectively.

At this time, an adhesive material layer such as optical clear adhesive (OCA) may be formed between the first substrate 10a and the second substrate 10b.

Therefore, even when external foreign matter passes through the shielding portion 40 formed on the outermost side, the possibility of damage to the sensing electrode 20 or the like by the shielding portion 40 formed on the inside can be effectively reduced.

FIG. 9 is a view illustrating a touch panel according to a fifth embodiment of the present invention, and FIG. 10 is a cross-sectional view illustrating a portion of a touch panel cut along a line E-E 'in FIG. The same reference numerals are used for the same components as those of the first to fourth embodiments described above with reference to Figs. 1 to 8, and a detailed description thereof will be omitted.

The substrate of the touch panel according to the fifth embodiment of the present invention includes a first substrate 10a and a second substrate 10b and the sensing electrode 20 includes a first sensing electrode 20a and a second sensing electrode 20b. 20b, and the wiring 30 may include a first wiring 30a and a second wiring 30b. In this case, the first sensing electrode 20a and the first wiring 30a are formed on the upper surface of the first substrate 10a and are electrically connected to each other. On the upper surface of the second substrate 10b, A second wiring 20b and a second wiring 30b are formed and electrically connected to each other.

In this case, the first shielding portion 40a is formed on the upper surface of the first substrate 10a together with the first sensing electrode 20a and the first wiring 30a, and the second shielding portion 40b is formed on the upper surface of the second substrate 10a, Is formed on the upper surface of the second substrate 10b together with the sensing electrode 20b and the second wiring 30b. In other words, unlike the third and fourth embodiments described above with reference to FIGS. 5 to 8, in the fifth embodiment, both the sensing electrode 20 and the wiring 30 are formed on the first substrate 10a and the second substrate The shielding portion 40 is formed on the upper surface of the first substrate 10a and the second substrate 10b, respectively.

The first shielding portion 40a formed on the upper surface of the first substrate 10a surrounds the first sensing electrode 20a and the first wiring 30a and is formed on the upper surface of the second substrate 10b. Since the second shielding portion 40b surrounds the second sensing electrode 20b and the second wiring 30b, the second shielding portion 40b serves as a shield for shielding the sensing electrode 20 and the wiring 30 from being exposed to external foreign matter .

The touch panel according to the fifth embodiment may further include a cover substrate 100 and an adhesive material layer 200. Specifically, the transparent substrate 100 is placed on the second substrate 10b and is in contact with a human hand or a touch pen. The transparent substrate 100 is formed of a material such as tempered glass or PMAA (PolyMethyMethacrylate) It is possible to protect the sensing electrode 20, the wiring 30, The adhesive material layer 200 is a structure for attaching the respective substrates to each other. Typically, OCA (optical clear adhesive) can be used. However, the adhesive material layer 200 is not limited to OCR (optical clear resin) It is irrelevant if it is a material that has optical transparency and can adhere each substrate. 9 and 10, a first adhesive material layer 200a is formed between the first substrate 10a and the second substrate 10b, and the cover substrate 100 and the second substrate 10b The second adhesive material layer 200b may be formed between the first adhesive material layer 10b and the second adhesive material layer 200b.

In the first to fifth embodiments described above, the shielding portion 40 is shown to have a rectangular cross section. However, the shielding portion 40 may be formed in various shapes such as a polygonal shape or a convex shape, . It is needless to say that in the first to fourth embodiments, an adhesive material layer such as optical clear adhesive (OCA) may be formed between each substrate as in the fifth embodiment.

Further, the shielding portion 40 may have a thickness of 5 占 퐉 or more and 15 占 퐉 or less. Specifically, when the shielding portion 40 is formed by using a screen printing technique or the like, bubbles may be generated due to the difference in thickness as the thickness of the shielding portion 40 is increased. As the thickness of the shielding portion 40 is reduced, external foreign substances can not be effectively blocked. 40) is formed to be 5 탆 or more and 15 탆 or less, it is possible to maintain the foreign matter blocking performance to a certain level or more while minimizing defects due to bubble generation.

In addition, the shield 40 may have a width of 0.09 mm or more and 1.1 mm or less. Specifically, the shielding portion 40 may be formed in the touch inactive region or the non-screen region. As the width of the shielding portion 40 increases, the shielding effect against external foreign substances increases. On the other hand, There is a disadvantage that the width becomes wider and finally the size of the whole product becomes larger than the same screen area. In addition, when the wiring 30 and the ground line 50 and the shielding portion 40 are formed together in the limited touch inactive region, mutual signal interference may occur or a process limit due to complicated patterns may follow.

Therefore, the lower limit of the width of the shielding portion 40 is set to 0.09 mm, the external foreign matter shielding performance is maintained at a predetermined level or more, and the upper limit is set to 1.1 mm, The interference with the line 50 can be minimized and the complexity of the process can be reduced.

Meanwhile, the touch panel according to the first to fourth embodiments of the present invention can be installed in a video display device. As such a video display device, a mobile phone, a notebook, a tablet PC, a wearable A wearable device, a head up display (HUD), a navigation device, a camera, a medical device, and the like. Such a video display device may include an image display device such as a cathode ray tube (CRT), a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an electroluminescence display . That is, the image display device should be understood as a term that can cover all devices that display data or graphic objects so as to be visible to a human eye.

It is to be understood that the term "comprising" and / or " comprising " as used herein means that the constituent element may be implanted unless specifically stated to the contrary, .

The embodiments of the present invention described above are disclosed for the purpose of illustration, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

10: substrate
10a: a first substrate
10b: second substrate
20: sensing electrode
30: Wiring
30a: first wiring
30b: second wiring
40:
40a: first shielding portion
40b: second shielding part
50: ground line
100: Cover substrate
200: adhesive material layer
200a: first adhesive material layer
200b: a second adhesive material layer

Claims (6)

A sensing electrode formed on a substrate;
At least one wiring electrically connected to the sensing electrode; And
A shielding portion formed between the edge of the substrate and the wiring;
And a touch panel.
The method according to claim 1,
The shielding portion
A touch panel comprising at least one insulating material
The method according to claim 1,
A ground line formed on one side of the wiring and to which a ground power source is applied;
Further comprising:
The shielding portion
Wherein the touch panel is disposed between the wiring and the ground line near the edge of the substrate and the edge of the substrate.
The method according to claim 1,
Wherein the substrate comprises a first substrate and a second substrate,
Wherein the wiring and the shielding portion
Wherein the touch panel is disposed on at least one of the first substrate and the second substrate.
The method according to claim 1,
Wherein the substrate comprises a first substrate and a second substrate,
Wherein the wiring is formed on the first substrate or the second substrate,
Wherein the shielding portion comprises: a first shielding portion formed on the first substrate; And a second shield formed at least on the second substrate,
Wherein the first shielding portion and the second shielding portion are alternately arranged so as to be opposed to each other. The method according to claim 1,
The shielding portion
A thickness of 5 占 퐉 or more and 15 占 퐉 or less, or a width of 0.09 mm or more and 0.11 mm or less.

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