KR20130072410A - Conductive pattern of touch panel - Google Patents

Abstract

PURPOSE: An electrode pattern of a touch panel is provided to prevent degradation of visibility between a metal bridge line electrode and a pixel due to diffraction and interference at the same time, without blocking a light from a back light unit, by constituting the bridge electrode with thin metal bridge line electrodes constituted with rugged patterns. CONSTITUTION: Conductive pattern cells (221,231) are separated on a substrate, and an insulation layer (251) is formed on the conductive pattern cell. Metal bridge line electrodes (271) connect the conductive pattern cell onto the insulation layer, and are formed with rugged patterns. The rugged patterns are constituted by arranging and connecting dot type patterns in a row, and the dot type patterns are separated from each other in a constant interval.

Description

Electrode pattern of touch panel {CONDUCTIVE PATTERN OF TOUCH PANEL}

The present invention relates to an electrode pattern of a touch panel, and relates to an electrode pattern of a touch panel on which a metal bridge line electrode connecting the electrode pattern is formed.

2. Description of the Related Art In electronic devices such as personal digital assistants (PDAs), notebook computers, OA devices, medical devices, or car navigation systems, touch panels for providing input devices (pointing devices) It is widely used. A typical capacitive type touch panel is known as a resistive type, an electromagnetic induction type, an optical type, and the like.

Generally, the capacitive method is divided into analog method and digital method.

In the analog method, the sensor electrode is a sheet-shaped electrode and does not need a pattern in the sensing operation area, whereas the digital method requires a pattern of the electrode for sensing in the sensing operation area. In this digital scheme, the capacitive touch panel employs a change in capacitance caused between electrostatics and the transparent electrode of the human body to induce a base current in which the touch position can be identified. Various capacitive touch panel technologies have been developed to detect such human body, e.g., a finger or a stylus, where the touch panel is touched.

As an example, US Registration No. 6,970,160 discloses a lattice touch-sensing system for detecting a touch location on a touch-sensitive surface. The lattice-shaped touch sensing system may include two capacitive sensing layers separated by an insulating material, each layer consisting of substantially parallel conductive elements, and the two The conductive elements of the sensing layer are substantially orthogonal to each other. Each element can consist of a series of diamond shaped patches connected together by narrow conductive rectangular strips. Each conductive element of a given sensing layer is electrically connected to a lead line of a corresponding set of lead lines at one or both ends. A control circuit may also be included, the control circuit providing an excitation signal to both sets of conductive elements through the corresponding set of lead lines, and generating from the sensor elements when a touch occurs on the surface Receives a sensing signal, and determines the location of the touch based on the location of the affected bars in each layer.

Such a capacitive scheme is mostly made up of two capacitive sensing layers, the two capacitive sensing layers having a capacitive effect between the layers. And is formed with an insulating material. Such a configuration makes the structure of the panel very thick, resulting in a reduction in size. Moreover, conventional capacitive touch panels include substrates on both surfaces where two capacitive sensing layers are respectively formed. In this regard, through holes must be formed on the substrate to act as vias, and circuit layering must be employed to properly connect the conductor elements of the sensing layers. do. This makes the fabrication of capacitive touch panels difficult and complicated.

Therefore, in order to cope with such a problem, techniques for reducing two capacitive sensing layers to one are used.

FIG. 1 is a view showing an electrode pattern of a touch panel according to a related art, and FIG. 2 is a cross-sectional view illustrating an electrode pattern of a touch panel according to a related art. The conventional touch panel and electrode pattern will be described with reference to FIGS. 1 and 2. FIG.

A first axis Rx conductive pattern 120 is formed on the substrate 110 and a second axis Tx conductive transparent pattern cell 131 is formed as shown in FIGS. 1 and 2 (a) . Such electrode patterns are shown in cross section in Fig.

In this case, etching, sputtering, or screen printing may be used as a method of forming the first axial conductive pattern 120 and the second axial conductive transparent pattern cell 131, and may be transparent. As the material of the pattern, indium tin oxide (ITO) is generally used.

Thereafter, as shown in FIG. 2B, a photoresist (PR) layer 10 is formed on the second-axis conductive patterned cell 131, and then an insulating material is applied to the insulating-material applied layer 40 are formed.

Thereafter, the photoresist 10 is removed to form the insulating layer 50 as shown in FIG. 2C. The bridge electrode 90 is formed on the insulating layer 50 thus formed to electrically connect the second axis Tx conductive pattern cells 131 that are spaced apart from each other.

However, the electrode pattern of the conventional touch panel has a problem that the bridge electrode interconnecting the conductive pattern cells 131 is visible to the naked eye of the user, so that the width of the bridge electrode is set to 10 μm, but there is a problem of conductivity. Accordingly, a bridge electrode was constructed using metal, but there was also a problem in the naked eye due to the difference in reflectance and color between the metal and the surrounding LCD.

As such, in order to solve the visible problem, transparent materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and carbon nanotube (CNT) may be used. Due to the problem and the limitation of the conductivity of the transparent electrode, there was a problem that the design of reducing the width of the electrode was impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and the bridge electrode is composed of a plurality of thin metal bridge line electrodes composed of a concave-convex pattern, and the metal bridge line electrode and the pixel are caused by diffraction and interference of illumination from the backlight unit. We want to solve the problem of low visibility between pixels.

Electrode pattern of the touch panel according to an embodiment of the present invention, a plurality of conductive pattern cells are formed spaced apart from each other on the substrate; An insulating layer formed on the conductive pattern cell; And a plurality of metal bridge line electrodes formed to interconnect the conductive pattern cells on the insulating layer, wherein the metal bridge line electrodes are formed in an uneven pattern.

According to another exemplary embodiment of the present invention, the uneven pattern may be formed in a shape in which a plurality of dot patterns are arranged in a row and connected.

According to another embodiment of the present invention, the dot pattern may be formed spaced apart from each other at a predetermined uniform interval.

According to another embodiment of the present invention, the dot pattern may be formed to overlap each other.

According to another embodiment of the present invention, the dot pattern may be formed of a circular or polygonal pattern.

According to another embodiment of the present invention, the conductive pattern cell is indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), carbon nano tube (CNT), silver nano-wire (Ag Nano wire), a conductive polymer, or graphene (Graphene) can be composed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and constitutes a bridge electrode composed of a plurality of thin metal bridge line electrodes composed of an uneven pattern, and simultaneously prevents light from the backlight unit without diffusing and interfering with the metal bridge. The problem of low visibility between the line electrode and the pixel may be solved.

According to the present invention, while ensuring the electrical conductivity of the bridge electrode, it is possible to solve the problem of the bridge electrode visible to the naked eye of the user.

1 is a view showing an electrode pattern of a touch panel according to the prior art.
2 is a cross-sectional view illustrating an electrode pattern of a touch panel according to the related art.
3 is a diagram illustrating an electrode pattern of a touch panel according to an exemplary embodiment of the present invention.
4 is a diagram illustrating a pattern electrode of a touch panel according to another exemplary embodiment of the present invention.
5 is a diagram illustrating a pattern electrode of a touch panel according to another exemplary embodiment of the present invention.
6 is a diagram illustrating a pattern electrode of a touch panel according to another exemplary embodiment of the present invention.
7 is a diagram illustrating a pattern electrode of a touch panel according to another exemplary embodiment of the present invention.
8 is a diagram illustrating an electrode pattern of a touch panel according to another exemplary embodiment of the present invention.

Hereinafter, an electrode pattern of a touch panel according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention. In addition, the size of each component in the drawings may be exaggerated for the sake of explanation and does not mean a size actually applied.

An electrode pattern of a touch panel according to an embodiment of the present invention will be described with reference to FIG. 3.

3 is a view illustrating a pattern electrode of a touch panel according to an embodiment of the present invention. In detail, the pattern electrode of the metal bridge line electrode is formed in a rhombic shape.

As illustrated in FIG. 3, a second conductive pattern 220 is formed on the substrate 200 in the direction Rx of the first axis and is spaced apart from each other in the direction Tx of the second axis. Cells 231 are formed. The first conductive pattern 220 is composed of a first conductive pattern cell 221 and a conductive lead 223.

In this case, the first conductive pattern cells 221 are interconnected by the conductive leads 223, and the first conductive pattern cells 221, the second conductive pattern cells 231, and the conductive leads 223 are formed of ITO. (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZnO (Zinc Oxide), carbon nanotube (CNT), silver nano-wire (Ag Nano wire), conductive polymer, or graphene (Graphene) It can be formed as.

Here, it is preferable that the first conductive pattern 220 and the second conductive pattern 230 are substantially perpendicular to each other, but it is apparent that the first conductive pattern 220 and the second conductive pattern 230 may be arranged on the surface of the substrate at an angle including a non-vertical angle.

An insulating layer 251 is disposed on the first conductive pattern 220 and the second conductive pattern 230, and the insulating layer 251 uses an offset (off-set) or ink jet (Ink-Jet) process. The insulating layer 251 is formed on the second conductive pattern cells 231 and the conductive lead 223.

The metal bridge line electrode 271 may be formed on the insulating layer 251 to interconnect the second conductive pattern cells 231, and the metal bridge line electrode 271 may be formed in an uneven pattern. That is, as shown in FIG. 3, the metal bridge line electrodes 271 are formed in a concave-convex pattern to form a pair of thin metal bridge lines facing each other, and the concave-convex pattern includes a plurality of dot patterns in a line. The concave-convex pattern is formed in a rhombic dot-shaped pattern and is spaced apart from each other at predetermined uniform intervals.

4, 5, 6, and 7 are diagrams illustrating electrode patterns of a touch panel according to another exemplary embodiment of the present invention.

FIG. 4 illustrates an embodiment in which the uneven patterns of the metal bridge line electrodes 271 are formed in a rhombic dot pattern and overlap each other on the insulating layer 251. FIG. 5 illustrates the metal bridge lines on the insulating layer 251. The concave-convex pattern of the electrode 271 is formed in a circular dot-shaped pattern is an embodiment formed to be spaced apart from each other at a predetermined uniform interval.

6 illustrates an embodiment in which the uneven pattern of the metal bridge line electrode 271 is formed in a circular dot pattern and overlaps each other on the insulating layer 251, and FIG. 7 illustrates a metal on the insulating layer 251. The embodiment in which the uneven pattern 271 of the bridge line electrode 271 is formed of a square dot pattern and spaced apart from each other at a predetermined uniform interval is illustrated.

Meanwhile, the uneven pattern of the metal bridge line electrode according to the present invention is not limited to the embodiment of FIGS. 3 to 7 but may be formed of various types of polygons such as hexagons and octagons.

FIG. 8 is a view illustrating a pattern electrode of a touch panel according to another exemplary embodiment of the present invention, and illustrates an embodiment in which three metal bridge line electrodes 272 are formed in an uneven pattern on an insulating layer 251. Doing.

As shown in the embodiment of FIG. 8, when the metal bridge line electrode is composed of three metal bridge line electrodes formed in an uneven pattern, higher conductivity may be ensured as compared with the case of the two metal bridge line electrodes. .

Meanwhile, in the above embodiments, an example in which the uneven pattern is formed over the entire area of the metal bridge line electrode has been described. However, the uneven pattern may be formed in a partial area of the metal bridge line electrode. For example, the uneven pattern may be configured to be formed only at both ends or one end on the metal bridge line electrode, or may be configured to be formed only at the center region of the metal bridge line electrode.

In the above description, an example consisting of two or three metal bridge line electrodes has been described, but the present invention is not limited to the number of metal bridge line electrodes.

In general, the LCD is displayed in a black color when off, and thus there is a problem in that the bridge electrode is visible to the naked eye due to a difference in reflectance and color with the LCD. However, according to the present invention, the bridge electrode is formed of a metal bridge line electrode having a thin uneven pattern to reduce the phenomenon of the bridge electrode being visually recognized.

Therefore, according to the present invention, while ensuring the electrical conductivity of the bridge electrode, it is possible to solve the problem that the bridge electrode is visible to the human eye.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical spirit of the present invention should not be limited to the above-described embodiments of the present invention, but should be determined by the claims and equivalents thereof.

200: substrate
223: Challenge Lead
220: first conductive pattern
221: first conductive pattern cell
231: second conductive pattern cell
251: insulating layer
271, 272: metal bridge line electrode

Claims (6)

A plurality of conductive pattern cells formed spaced apart from each other on the substrate;
An insulating layer formed on the conductive pattern cell;
And a plurality of metal bridge line electrodes formed to interconnect the conductive pattern cells on the insulating layer.
The metal bridge line electrode,
Electrode pattern of a touch panel formed with an uneven pattern. The method of claim 1,
The concavo-
An electrode pattern of a touch panel, in which a plurality of dot patterns are arranged in a row and connected to each other. The method of claim 2,
The dot pattern is,
Electrode pattern of the touch panel is formed spaced apart from each other at a predetermined uniform interval. The method of claim 2,
The dot pattern is,
Electrode pattern of the touch panel formed to overlap each other. The method of claim 2,
The dot pattern is,
Electrode pattern of a touch panel that is a pattern of circles or polygons. The method of claim 1,
The conductive pattern cell,
Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Zinc Oxide (ZnO), carbon nano tube (CNT), silver nano-wire (Ag Nano wire), conductive polymer, or graphene Electrode pattern of the touch panel consisting of.

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