KR102095241B1 - Electrostatic capacity type touch screen panel - Google Patents

Abstract

A touch screen panel according to an exemplary embodiment of the present invention includes a substrate, a plurality of first electrodes arranged in a first direction on the substrate, and arranged in a second direction perpendicular to the first electrodes, and an insulating layer. The plurality of second electrodes insulated from the first electrodes and the first electrodes are arranged side by side and include dummy patterns formed between the first electrodes, and the area of the first electrodes is It may be larger than the area of the second electrodes.

Description

Touch screen panel {ELECTROSTATIC CAPACITY TYPE TOUCH SCREEN PANEL}

The present invention relates to a touch screen panel (corrected capacitive type).

Recently, display devices such as a liquid crystal display device, an electroluminescent display, and a plasma display panel have attracted attention because of their fast response speed, low power consumption, and excellent color reproduction. . Such display devices have been used in various electronic products such as TVs, computer monitors, notebook computers, mobile phones, refrigerator display units, personal digital assistants, and automated teller machines. In general, these display devices configure an interface with a user using various input devices such as a keyboard, a mouse, and a digitizer.

However, the use of separate input devices such as a keyboard and a mouse has a problem of causing user dissatisfaction by causing inconvenience such as learning how to use and taking up space. Accordingly, there is an ever increasing demand for an input device that is convenient, simple, and can reduce malfunction. According to such a demand, a touch screen panel has been proposed in which a user directly enters information by directly touching the screen with a hand or pen.

The touch screen panel is simple, has few malfunctions, and can be input without using a separate input device, and is applied to various display devices because of the convenience that the user can operate quickly and easily through the content displayed on the screen. Is becoming.

1 is a plan view showing a conventional touch screen panel.

Referring to FIG. 1, the Tx electrodes 20 are arranged on the substrate 10 in the x direction, and the Rx electrodes 30 are arranged in the y direction intersecting the Tx electrodes 20. In addition, the Tx electrodes 20 and Rx electrodes 30 are arranged symmetrically in a diamond shape, respectively. Therefore, when a user's touch occurs, a change in the capacitance between the Tx electrode 20 and the Rx electrode 30 is sensed to generate a touch position.

However, in the conventional touch screen panel, the Tx electrodes and the Rx electrodes are arranged symmetrically, so that the parasitic capacitance is large and the change in capacitance before and after the touch is small. In addition, when a touch screen panel is applied to a display device, noise is generated due to a change in voltage level of output data supplied from a source driver and a gate driver for driving a thin film transistor, and this noise is induced in the touch electrode of the touch screen panel. There was a problem in that the touch performance is reduced.

Accordingly, there is a need for a new touch screen panel that can solve the problems of the prior art.

The present invention provides a touch screen panel capable of improving touch performance by reducing parasitic capacitance and increasing a change in capacitance before and after touch.

In order to achieve the above object, the touch screen panel according to an embodiment of the present invention is a substrate, a plurality of first electrodes arranged in a first direction on the substrate, a first crossing the first electrodes Arranged in two directions, a plurality of second electrodes insulated from the first electrodes by an insulating layer and parallel to the first electrodes, including dummy patterns formed between the first electrodes, The area of the first electrodes may be larger than the area of the second electrodes.

The first electrodes, the second electrodes, and the dummy patterns may be formed on the same surface of the substrate.

The dummy patterns may be spaced apart from the first electrodes and the second electrodes.

The width of the first electrode may be greater than the width of the second electrode.

The area of the second electrodes may be 30% to 50% of the area of the first electrodes.

The width of the second electrode may be 500 μm to 2000 μm.

The area of the dummy patterns is 5% to 20% of the area of the first electrodes.

The width of the first electrode and the second electrode may decrease as they are adjacent to regions where the first electrode and the second electrode cross each other.

Each of the first electrodes may further include a plurality of first connection patterns, and the second electrodes may be integrally formed in the second direction.

The plurality of first routing wires connected to the first electrodes and the plurality of second routing wires connected to the second electrodes may be further included.

According to an embodiment of the present invention, by forming an area of the first electrode larger than that of the second electrode, and forming dummy patterns therebetween, there is an advantage of reducing the parasitic capacity of the touch screen panel and improving touch sensitivity.

1 is a plan view showing a conventional touch screen panel.
2 is a plan view of a touch screen panel according to an embodiment of the present invention.
3 is a cross-sectional view taken along line I-I 'and II-II' of the touch screen panel shown in FIG. 2;
4 is a view showing first electrodes, second electrodes, and dummy patterns of a touch screen panel according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Throughout the specification, the same reference numerals refer to substantially the same components. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description is omitted.

The touch screen panel according to the embodiment of the present invention will be described with reference to FIGS. 2 and 3 as follows. 2 is a plan view of a touch screen panel according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line I-I 'and II-II' of the touch screen panel illustrated in FIG. 2.

2 and 3, a touch screen panel according to an exemplary embodiment of the present invention includes an electrode portion A, a routing wiring portion B, and a pad portion C.

The electrode portion A is arranged in a first direction (x-axis direction) in a plurality of first electrodes 130 arranged in parallel, in a second direction (y-axis direction) intersecting the first electrodes 130. It includes a plurality of second electrodes 140 and a plurality of dummy patterns 150 arranged between them.

The first electrodes 130 each include a plurality of first electrode patterns 131 that are independently formed, and a plurality of first connection patterns 110 that connect neighboring first electrode patterns 131. do. The flat shape of the first electrode patterns 131 may be formed as a quadrangular protruding triangle horn on both sides.

Each of the second electrodes 140 includes a plurality of second electrode patterns 141. Unlike the first electrode patterns 131, the second electrode patterns 141 are integrally formed so that a connection pattern is not formed. The planar shape of the second electrode pattern 141 may be formed as a long hexagon.

The dummy patterns 150 are formed between the first electrodes 130 and the second electrodes 140 intersecting each other. The dummy patterns 150 are spaced apart from each other by maintaining a predetermined interval without contacting the first electrodes 130 and the second electrodes 140. The dummy patterns 150 are formed between the first electrodes 130 and the second electrodes 140 to prevent the user from visually viewing the pattern shape of the electrodes and to reduce parasitic capacitance. The planar shape of the dummy patterns 150 may be a shape between the first electrodes 130 and the second electrodes 140, and may be rectangular as illustrated in the drawing.

The first and second electrode patterns 131 and 141 constituting the first electrodes 130 and the second electrodes 140 of the electrode part A and the first connection patterns 110 are All are formed of the same material, and are formed of a transparent conductive material such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Gallium-Doped Zinc Oxide (GZO). Further, the dummy patterns 150 may also be formed of a transparent conductive material such as ITO, IZO, GZO. In addition, the first electrodes 130, the second electrodes 140 and the dummy patterns 150 are formed on the same surface of the substrate 100.

In the touch screen panel according to the exemplary embodiment of the present invention described above, the first connection patterns 110 are formed on a different layer from the first electrode patterns 131, and the adjacent first electrode patterns 131 are formed. Connect to each other. On the other hand, the second electrode patterns 141 are integrally formed without a connection pattern such as the first connection pattern. However, the present invention is not limited to this, for example, the first connection patterns 110 are formed integrally with the first electrode patterns 131, and the second connection patterns 137 are constant connection patterns. It may be formed to connect to each other through.

The routing wiring part B is formed on an outer portion of the electrode part A and is connected to a plurality of first electrodes 130 and a plurality of first routing lines 112 and a plurality of second electrodes ( 140) and a plurality of second routing wires 114 connected to each other. Each of the first and second routing wires 112 and 114 may be made of a metal material such as Al, AlNd, Mo, MoTi, Cu, Cr. The routing wiring part B may also be configured to further include an insulating layer 120 formed thereon to protect the first and second routing wiring lines 112 and 114.

In one embodiment of the present invention, the first and second routing wires 112 and 114 have been described as being formed in a single layer structure, but the present invention is not limited thereto. For example, each of the first and second routing wires 112 and 114 includes a transparent conductive layer such as ITO, IZO, and GZO on a single layer of a metal material such as Al, AlNd, Mo, MoTi, Cu, and Cr. It can also be formed in a stacked double layer structure.

The pad part C includes a plurality of first pads 116 and a plurality of second routing wires (respectively) connected to the plurality of first electrodes 130 through the plurality of first routing wires 112. It is made of a plurality of second pads 118 that are respectively connected to the plurality of second electrodes 140 through 114). Each of the first and second pads 116 and 118 includes first layers 116a and 118a made of a metal material such as Al, AlNd, Mo, MoTi, Cu, and Cr, and the first layers 116a and 118a. ), And is formed of second layers 116b and 118b formed of a transparent conductive material such as ITO, IZO, and GZO.

In the description of the above-described embodiment, the first and second pads 116 and 118 are described as being formed in a two-layer structure, but the present invention is not limited thereto. For example, the first and second pads 116 and 118 may be formed of a single layer structure 116a or 118a made of a metal material without forming a two-layer structure that is a top layer.

On the other hand, in the touch screen panel according to an embodiment of the present invention, the first connection patterns 110, the first and second routing wires 112 and 114, and the first and second on the substrate 100 Pads 116 and 118 are formed, and an insulating layer 120 is formed on the substrate 100 on which they are formed. The insulating layer 120 includes first and second contact holes 120a and 120b exposing portions of each of the first connection patterns 110 and first routing wires 112 as illustrated in FIG. 3. ) And a third contact hole 120c exposing a portion of each of the second routing wires 114 and a fourth contact hole exposing a portion of each of the first pad 116 and the second pad 118 ( 120d).

In the embodiment of FIG. 3, the first to fourth contact holes 120a and 120b are formed on the front surface of the substrate 100 on which the first connection patterns 110 and the first and second routing wires 112 and 114 are formed. Although described as forming the insulating layer 120 having 120c and 120d), the present invention is not limited thereto. For example, the insulating layer 120 is a first constituting the first electrode 130, so that the first and second electrodes 130, 140 in the electrode portion (A) do not contact each other as shown in FIG. The electrode pattern 131 and the second electrode 140 may be partially formed only at intersections of the second electrode patterns 141. As the material of the insulating layer 120, silicon nitride (SiNx) is used.

In addition, the first to fourth contact holes 120a, 120b, 120c, and 120d are formed on the insulating layer 120 formed of a plurality of first electrode patterns 131 and arranged in a first direction (x-axis direction) A plurality of first electrodes 130 are formed, a plurality of second electrode patterns 141 and a plurality of second electrodes arranged in a second direction (y-axis direction) intersecting the first direction 140 is formed.

Since the first electrode patterns 131 constituting the first electrodes 130 are formed separately from each other, they need to be connected to each other in order to form a touch sensing circuit. In the touch screen panel according to an embodiment of the present invention, the first electrode patterns 131 adjacent to each other are insulating exposed through the first and second contact holes 120a and 120b as shown in FIG. 3. The first connection pattern 110 under the layer 120 is connected to each other. However, the adjacent first electrode patterns 131 may be connected to each other by the first connection pattern 110 exposed through the opening as illustrated in FIG. 3.

Meanwhile, the first and second electrode patterns 131 and 141 positioned at the outermost sides of the electrode portion A are connected to the first and second routing wires 112 and 114 through the third contact hole 120c. Each is connected. Alternatively, each of the first and second electrode patterns 131 and 141 positioned at the outermost portion of the electrode portion A may be connected to the first and second routing wires 112 and 114 through the opening, respectively. It might be.

In addition, the first and second electrode pads 116 and 118 of the pad portion C are first and second routing wires through the fourth contact holes 120d as shown in FIGS. 2 and 3. (112, 114) respectively.

Next, first electrodes, second electrodes, and dummy patterns according to an embodiment of the present invention will be described in more detail with reference to FIG. 4.

4 is a view showing first electrodes, second electrodes, and dummy patterns of a touch screen panel according to an embodiment of the present invention. Referring to FIG. 4, a plurality of first electrodes 130 are arranged in a first direction (x-axis direction), and a plurality of second electrodes 140 cross a first direction (y-axis). Direction), and dummy patterns 150 are respectively arranged between the first electrodes 130 and the second electrodes 140.

In the present invention, the area of the second electrodes 140 is smaller than the area of the first electrodes 130. More specifically, the area of the second electrodes 140 is 30% to 50% of the area of the first electrodes 130. One of the reasons for the occurrence of parasitic capacitance in the touch screen panel is that the overlapping regions of the first electrode 130 and the second electrode 140 exist. Accordingly, in the present invention, the area of the second electrodes 140 is reduced to be smaller than that of the first electrodes 130, thereby minimizing the overlapping areas of the first electrodes 130 and the second electrodes 140, thereby parasitic. Decrease capacity.

In this case, the first electrode 130 and the second electrode 140 are formed in a shape in which the width decreases as the first electrode 130 and the second electrode 140 are adjacent to regions crossing each other. That is, when the widths of the first electrode 130 and the second electrode 140 are reduced in a crossing region where the first electrode 130 and the second electrode 140 directly overlap, parasitic capacitance can be reduced, There is an advantage that can prevent the resistance of the first electrode 130 and the second electrode 140 is increased.

In addition, the width W1 of the second electrode 140 is formed smaller than the width W2 of the first electrode 130. At this time, the width W1 of the second electrode 140 is formed to be 500 to 2000 μm to maintain touch performance.

In addition, the area of the dummy patterns 150 formed between the first electrodes 130 and the second electrodes 140 is smaller than the area of the first electrodes 130. More specifically, the area of the dummy patterns 150 is 5% to 20% of the area of the first electrodes 130. Here, when the area of the dummy patterns 150 is 5% or more of the area of the first electrodes 130, parasitic capacitance formed between the first electrodes 130 and the second electrodes 140 may be reduced. If there is an advantage, and the area of the dummy patterns 150 is 20% or less of the area of the first electrodes 130, there is an advantage that the current pass is small to prevent the touch performance from deteriorating.

In general, there are a voltage method and a charge method as a method of sensing a touch. The touch detection method according to an embodiment of the present invention is based on a voltage method, and is defined according to Equation 1 below.

In Equation 1 above, “Vs” is a value representing touch sensitivity as a voltage level, “Vin” is a voltage input to a driving electrode (the first electrode in the embodiment of the present invention), and “Vout before touch” is The voltage output to the sensing electrode before the touch (the second electrode in the embodiment of the present invention), and “Vout after touch” indicate the voltage output to the sensing electrode after the touch (the second electrode in the embodiment of the present invention).

Vs representing touch sensitivity is a capacitance between the first and second electrodes, an electrode (for example, a common electrode) of the display device and first and second electrodes when applied to the display device, as described in Equation 1 above. It is affected by the capacitance between the electrodes and the capacitance lost by the touch when the touch is made. In Equation 1, “Cm” denotes mutual capacitance between the first electrode and the second electrode, and can be divided into a component by a near field and a component by a far field. "Cmnear" represents the capacitance by the near field, and "Cmfar" represents the capacitance by the far field. In addition, "Cp" is between the first and second electrodes and the electrode of the display device (for example, a common electrode). It represents the components that combine all the capacitances that are not used for sensing, such as the capacitance formed between the capacitance formed between the first electrodes, the capacitance formed between the first electrodes, and the capacitance formed between the second electrodes. It represents the capacitance by.

According to Equation 1, in order to increase the value of Vs, which is the touch sensitivity, the capacitance formed between the first and second electrodes represented by "Cp" and the electrode of the display device and the capacitance formed between the first electrodes and the second electrode It is necessary to reduce the parasitic capacitance, which is a component of all capacitances not used for sensing, such as the capacitance formed between electrodes.

Accordingly, according to an embodiment of the present invention, by forming the area of the first electrode larger than that of the second electrode and forming dummy patterns between them, the parasitic capacitance of the touch screen panel may be reduced to improve touch sensitivity.

Hereinafter, preferred embodiments are disclosed to help understanding of the present invention. However, the following examples are merely illustrative of the present invention, and the present invention is not limited to the following examples.

In the following, as a comparative example, the touch screen panel shown in FIG. 1 was manufactured, and as an example, the touch screen panel shown in FIG. 2 was manufactured. The amount of change in the electrostatic capacity before and after the touch of the touch screen panel manufactured according to the above Examples and Comparative Examples was measured and shown in Table 1 below.

Amount of capacitance change Comparative example Example Maximum change amount (%) 0.20 0.29 Minimum change amount 1 (%) 0.03 0.05 Minimum change amount 2 (%) 0.02 0.03

Referring to Table 1, the touch screen panel according to an embodiment of the present invention was found that the amount of change in the electrostatic capacity before and after the touch is increased than the comparative example. That is, it was confirmed that the touch performance was improved because the parasitic capacity was reduced. Through the above description, those skilled in the art will appreciate that various changes and modifications are possible without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined by the scope of the claims.

100: substrate 110: connection pattern
120: insulating layer 130: first electrode
140: second electrode 150: dummy pattern

Claims (7)

Board;
A plurality of first electrodes arranged in a first direction on the substrate;
A plurality of second electrodes arranged in a second direction perpendicular to the first electrodes and insulated from the first electrodes by an insulating layer;
Dummy patterns arranged side by side with the first electrodes and formed between the first electrodes;
A plurality of first routing wires each connected to each of the plurality of first electrodes and including a first metal layer disposed on the substrate and a first transparent conductive layer disposed on the first metal layer; And
A second metal layer, each of which is connected to each of the plurality of second electrodes, disposed on the substrate and formed of the same material as the first metal layer; and the first transparent conductive layer disposed on the second metal layer. A plurality of second routing wires including a second transparent conductive layer formed of the same material;
It includes,
The plurality of first and second electrodes and the dummy pattern are formed of the same material as the first transparent conductive layer,
The area of the second electrodes is 30% to 50% of the area of the first electrodes,
The area of the dummy patterns is 5% to 20% of the area of the first electrodes. According to claim 1,
The first electrode patterns constituting each of the first electrodes, the second electrodes, and the dummy patterns are formed on the same surface of the substrate,
Each of the first electrode patterns includes a first side and a second side that have the same length and are parallel to each other,
Each of the dummy patterns includes a third side and a fourth side that have the same length as the first side and the second side and are parallel to each other.
The third side of the dummy pattern is disposed adjacent to the first side of any one of the first electrode patterns, and the fourth side of the dummy pattern is the second side of the other first electrode pattern. A touch screen panel disposed adjacent to the sides. According to claim 1,
The dummy patterns are first electrode patterns constituting each of the first electrodes and a touch screen panel spaced apart from the second electrodes. According to claim 1,
The width of the first electrode is greater than the width of the second electrode touch screen panel. According to claim 1,
The width of the second electrode is 500 μm to 2000 μm touch screen panel. According to claim 1,
Each of the first electrode and the second electrode is a touch screen panel having a width that decreases as it is adjacent to an area where the first electrode and the second electrode intersect. According to claim 1,
Among the electrode patterns constituting each of the first electrodes, adjacent electrode patterns are connected to each other, and further comprising a plurality of first connection patterns formed of the same material as the first metal layer on the substrate, and the second electrodes Each is a touch screen panel integrally formed in the second direction.

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