KR20220139535A - Touch sensor and display device including the same - Google Patents

Abstract

In one aspect of the present disclosure, a touch sensor includes: a substrate; a driving electrode disposed on a substrate; a first floating electrode disposed on the driving electrode; a second floating electrode spaced apart from the same layer as the driving electrode and disposed on the substrate; and a sensing electrode disposed on the second floating electrode, wherein the first floating electrode and the second floating electrode are in a floating state with the driving electrode and the sensing electrode. According to the present invention, the touch sensor having improved sensitivity compared to a conventional capacitive touch sensor and a display device including the touch sensor may be provided.

Description

TOUCH SENSOR AND DISPLAY DEVICE INCLUDING THE SAME

The present disclosure relates to a touch sensor and a display device including the same.

A touch sensor is a sensor capable of recognizing the position of a target object (finger, input pen, etc.) that is in contact, pressure, or close to the sensor. It is a sensor device.

A touch sensor is generally used as a plate and is attached to various surfaces, and in a mobile device, it is mainly attached or integrated on a display panel that displays an image to perform a touch recognition function.

Types of the touch sensor include a capacitive touch sensor, an inductive touch sensor, and a resistive touch sensor. Here, in particular, the capacitive touch sensor is a touch sensor that detects a change in the capacitance of the touch sensor according to an approach of a sensing target part, such as a finger.

However, the conventional capacitive touch sensor has a problem in that the touch performance is deteriorated in the 10-inch band in the flexible touch display.

US registered patent US9927939B2 US registered patent US9323372B2

Various examples of the present disclosure are to provide a touch sensor with improved sensitivity of the touch sensor compared to the existing capacitive touch sensor, and a display device including the same.

Technical problems to be achieved in various examples of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned are to those of ordinary skill in the art from various examples of the present disclosure to be described below. can be considered by

In one aspect of the present disclosure, a substrate; a driving electrode disposed on the substrate; a first floating electrode disposed on the driving electrode; a second floating electrode spaced apart from the driving electrode and disposed on the substrate; and a sensing electrode disposed on the second floating electrode, wherein the first floating electrode and the second floating electrode are in a floating state with the driving electrode and the sensing electrode.

The first floating electrode and the second floating electrode may be connected through a via hole.

The first floating electrode and the second floating electrode may form a capacitor without being physically connected to each other.

The driving electrode and the sensing electrode may be disposed to be spaced apart from each other on different layers.

When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the driving electrode and the cross-sectional area of the sensing electrode may have different sizes have.

A size of a cross-sectional area of the sensing electrode may be smaller than a size of a cross-sectional area of the driving electrode.

Each of the first floating electrode and the second floating electrode may have a cross-sectional area corresponding to a cross-sectional area of each of the driving electrode and the sensing electrode.

When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the first floating electrode and the cross-sectional area of the second floating electrode are different from each other can have size.

When viewed in a direction perpendicular to a stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the first floating electrode may be disposed to partially overlap the driving electrode.

When viewed in a direction perpendicular to a stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the second floating electrode may be disposed to partially overlap the sensing electrode.

a cover film disposed on the first floating electrode and the sensing electrode and in contact with an object; and a processor electrically connected to the driving electrode and the sensing electrode, wherein the processor applies a driving signal to the driving electrode, receives a response signal to the driving signal from the sensing electrode, and the response signal A touch of the object may be recognized based on .

In another aspect of the present disclosure, a display substrate including a display area; and a touch sensor coupled to the display substrate, the touch sensor comprising: a substrate; a driving electrode disposed on the substrate; a first floating electrode disposed on the driving electrode; a second floating electrode spaced apart from the driving electrode and disposed on the substrate; and a sensing electrode disposed on the second floating electrode, wherein the first floating electrode and the second floating electrode are in a floating state with the driving electrode and the sensing electrode.

The first floating electrode and the second floating electrode may be connected through a via hole.

The first floating electrode and the second floating electrode may form a capacitor without being physically connected to each other.

When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the driving electrode and the cross-sectional area of the sensing electrode may have different sizes have.

A size of a cross-sectional area of the sensing electrode may be smaller than a size of a cross-sectional area of the driving electrode.

When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the first floating electrode and the cross-sectional area of the second floating electrode are different from each other can have size.

When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the first floating electrode is disposed to partially overlap the driving electrode, When viewed in a direction perpendicular to the stacking direction of the electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the second floating electrode may be disposed to partially overlap the sensing electrode.

The touch sensor may include: a cover film disposed on the first floating electrode and the sensing electrode and in contact with an object; and a processor electrically connected to the driving electrode and the sensing electrode, wherein the processor applies a driving signal to the driving electrode, receives a response signal to the driving signal from the sensing electrode, and the response signal A touch of an object may be recognized based on .

The various examples of the present disclosure described above are only some of the preferred examples of the present disclosure, and various examples in which the technical features of various examples of the present disclosure are reflected are detailed descriptions to be detailed below by those of ordinary skill in the art. can be derived and understood based on

According to various examples of the present disclosure, the following effects are obtained.

According to various examples of the present disclosure, a touch sensor having improved sensitivity of the touch sensor compared to a conventional capacitive touch sensor and a display device including the same may be provided.

Effects that can be obtained from various examples of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned are clearly derived to those of ordinary skill in the art based on the detailed description below. and can be understood

The accompanying drawings are provided to help understanding of various examples of the present disclosure, and various examples of the present disclosure are provided together with the detailed description. However, the technical features of various examples of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to constitute a new embodiment. Reference numerals in each drawing refer to structural elements.
1 is a cross-sectional view of a touch sensor according to an example of the present disclosure.
2 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
3 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
4 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
5 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
6 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
7 is a cross-sectional view of a touch sensor according to another example of the present disclosure.
8 is a cross-sectional view of a display device according to an example of the present disclosure.
9A is a circuit diagram of a conventional capacitive sensor, and FIG. 9B is a circuit diagram of a touch sensor according to an example of the present disclosure.

Hereinafter, implementations according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary implementations of the present invention, and is not intended to represent the only implementation forms in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the present disclosure may be practiced without these specific details.

In some cases, well-known structures and devices may be omitted or shown in block diagram form focusing on core functions of each structure and device in order to avoid obscuring the concepts of the present disclosure. In addition, the same reference numerals are used to describe the same components throughout the present disclosure.

Since various examples according to the concept of the present invention can have various changes and have various forms, various examples are illustrated in the drawings and described in detail in the present disclosure. However, this is not intended to limit various examples according to the concept of the present invention to specific disclosed forms, and includes changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named as a second component, Similarly, the second component may also be referred to as the first component.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle. Expressions describing the relationship between elements, for example, “between” and “between” or “directly adjacent to”, etc. should be interpreted similarly.

In various examples of the present disclosure, “/” and “,” should be construed as indicating “and/or”. For example, “A/B” may mean “A and/or B”. Furthermore, “A, B” may mean “A and/or B”. Furthermore, “A/B/C” may mean “at least one of A, B, and/or C”. Furthermore, “A, B, and C” may mean “at least one of A, B and/or C”.

In various examples of the present disclosure, “or” should be construed as indicating “and/or”. For example, “A or B” may include “only A”, “only B”, and/or “both A and B”. In other words, “or” should be construed as indicating “additionally or alternatively”.

The terminology used in the present disclosure is used only to describe various specific examples, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present disclosure, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and includes one or more other features or numbers, It should be understood that the possibility of the presence or addition of steps, operations, components, parts or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present disclosure. does not Hereinafter, various examples of the present disclosure will be described in detail with reference to the accompanying drawings.

touch sensor

In the present disclosure, a touch sensor is a sensor that recognizes a touch of an object such as a user's finger or a stylus, and may be referred to as a touch panel. In various examples of the present disclosure, the touch sensor includes a driving electrode, a sensing electrode, and a floating electrode stacked according to various methods.

Hereinafter, a touch sensor according to various examples of the present disclosure will be described.

Example 1

1 is a cross-sectional view of a touch sensor 10 according to an example of the present disclosure.

Referring to FIG. 1 , a touch sensor 10 according to an example of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode 500 . ) and an insulating layer 700 .

The substrate 100 may be formed of various materials. The substrate 100 may be made of an insulating material such as glass or resin. In addition, the substrate 100 may be made of a material having flexibility to be bent or folded, and may have a single-layer structure or a multi-layer structure. Also, the substrate 100 may have transparency through which light may pass.

The substrate 100 may be provided according to an aspect in which the touch sensor 10 according to various examples of the present disclosure is coupled to the display substrate 2 to be described later. For example, when the touch sensor 10 is coupled to the display substrate 2 in an outcell manner, the substrate 100 may be attached to the display substrate 2 .

For example, when the touch sensor 10 is coupled to the display substrate 2 in an on-cell manner, the substrate 100 is an encapsulation this film used for the display substrate 2 . can be

The driving electrode 200 may be disposed on the substrate 100 and may be a transmitter (Tx) electrode. The driving electrode 200 may be electrically connected to a processor (not shown) to be described later, and a driving signal may be applied from the processor (not shown).

The first floating electrode 300 is disposed on the driving electrode 200 . For example, the first floating electrode 300 is disposed on the upper end of the driving electrode 200 . The first floating electrode 300 is not physically connected to the driving electrode 200 and the sensing electrode 500 , but is in an electrically separated state, that is, in a floating state. In other words, the first floating electrode 300 does not supply an electrical signal and does not receive an electrical signal.

The first floating electrode 300 is formed in a direction perpendicular to the stacking direction (hereinafter, referred to as the A direction) of the driving electrode 200 , the first floating electrode 300 , the second floating electrode 400 , and the sensing electrode 500 (hereinafter referred to as the A direction). , B direction), it is disposed to overlap the driving electrode 200 . For example, a part or all of the first floating electrode 300 may overlap all of the driving electrode 200 .

As the first floating electrode 300 is disposed to overlap the driving electrode 200 , the first floating electrode 300 and the driving electrode 200 may form a capacitor in the overlapping region. Here, a separate insulating layer 700 may be provided between the first floating electrode 300 and the driving electrode 200 . The capacitor formed between the first floating electrode 300 and the driving electrode 200 may serve to shield noise generated from the display substrate 2 to the first floating electrode 300 .

The second floating electrode 400 is disposed on the substrate 100 . For example, the second floating electrode 400 is disposed on the top of the substrate 100 . Specifically, the second floating electrode 400 may be disposed on the substrate 100 to be spaced apart from the same layer as the driving electrode 200 . In this case, a separate insulating layer may be provided between the second floating electrode 400 and the driving electrode 200 . The second floating electrode 400 is in a floating state like the first floating electrode 300 .

The second floating electrode 400 is a sensing electrode when viewed in a direction perpendicular to the stacking direction of the driving electrode 200 , the first floating electrode 300 , the second floating electrode 400 , and the sensing electrode 500 . It is arranged to overlap with (500). For example, some or all of the second floating electrode 400 may overlap all of the sensing electrode 500 .

As the second floating electrode 400 is disposed to overlap the sensing electrode 500 , the second floating electrode 400 and the sensing electrode 500 may form a capacitor in the overlapping region. Here, a separate insulating layer 700 may be provided between the second floating electrode 400 and the sensing electrode 500 . The capacitor formed between the second floating electrode 400 and the sensing electrode 500 may serve to shield noise generated from the display substrate 2 toward the sensing electrode 500 .

The first floating electrode 300 and the second floating electrode 400 are disposed to be spaced apart from each other on different layers. In this case, the first floating electrode 300 and the second floating electrode 400 are connected to each other through a via hole 600 .

The sensing electrode 500 may be disposed on the second floating electrode 400 . For example, the sensing electrode 500 is disposed to overlap the second floating electrode 400 as described above. The sensing electrode 500 may be a receiving (Receiver, Rx) electrode. The sensing electrode 500 senses a response signal to the driving signal, and may be electrically connected to a processor (not shown) to be described later to transmit the response signal to the processor (not shown).

In the present disclosure, the driving electrode 200 and/or the sensing electrode 500 may have various shapes. For example, the driving electrode 200 and/or the sensing electrode 500 may have various shapes such as diamonds, other polygons, and meshes.

The insulating layer 700 is provided between the layer on which the driving electrode 200 and the second floating electrode 400 are disposed and the layer on which the first floating electrode 300 and the sensing electrode 500 are disposed. The insulating layer 700 is formed of various insulating materials to block electrical connection between different layers. In addition, in the layer in which the driving electrode 200 and the second floating electrode 400 are disposed, a separate insulating layer may be provided between the driving electrode 200 and the second floating electrode 400 , and the first floating electrode In the layer in which 300 and the sensing electrode 500 are disposed, a separate insulating layer may be provided between the first floating electrode 300 and the sensing electrode 500 .

As described above, in the touch sensor 10 of the present disclosure, the sensing electrode 500 is disposed to be spaced apart from the driving electrode 200 on a different layer. For example, the driving electrode 200 is disposed at the bottom of the first floating electrode 300 , that is, on the same layer as the second floating layer, and the sensing electrode 500 is at the top of the second floating electrode 400 , that is, the second floating layer. 1 It may be disposed on the same layer as the floating electrode 300 . Accordingly, the driving electrode 200 performs a noise shielding role for the first floating electrode 300 , and the second floating electrode 400 performs a noise shielding role for the sensing electrode 500 , thereby to-noise) characteristics can be improved.

Example 2

2 is a cross-sectional view of a touch sensor according to another example of the present disclosure. Hereinafter, a detailed description of the parts overlapping with the previously described parts will be omitted.

Referring to FIG. 2 , the touch sensor 10 according to another example of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode ( 500 ) and an insulating layer 700 .

In the touch sensor 10 according to another example of the present disclosure, when viewed in the B direction, the cross-sectional area of the driving electrode 200 and the cross-sectional area of the sensing electrode 500 may have different sizes. Accordingly, when viewed in the B direction, the cross-sectional area of the first floating electrode 300 and the cross-sectional area of the second floating electrode 400 may also have different sizes.

For example, the size of the cross-sectional area of the sensing electrode 500 may be smaller than the size of the cross-sectional area of the driving electrode 200 . Accordingly, each of the first floating electrode 300 and the second floating electrode 400 may have a cross-sectional area corresponding to the cross-sectional area of each of the driving electrode 200 and the sensing electrode 500 . That is, the size of the cross-sectional area of the second floating electrode 400 may be smaller than the size of the cross-sectional area of the first floating electrode 300 .

As the cross-sectional area of the driving electrode 200 and the cross-sectional area of the sensing electrode 500 have different sizes, the cross-sectional area of the first floating electrode 300 and the cross-sectional area of the second floating electrode 400 have different sizes, The above-described shielding effect by the driving electrode 200 and the shielding effect by the second floating electrode 400 may be adjusted to be different from each other.

When the size of the cross-sectional area of the sensing electrode 500 is smaller than the size of the cross-sectional area of the driving electrode 200 and the size of the cross-sectional area of the second floating electrode 400 is smaller than the size of the cross-sectional area of the first floating electrode 300, sensing The size of the capacitor formed between the electrode 500 and the second floating electrode 400 may be larger than the size of the capacitor formed between the driving electrode 200 and the first floating electrode 300 . Accordingly, the shielding effect due to the second floating electrode 400 may be increased.

Hereinafter, in Examples 3 to 5 of the present disclosure, as described above, the driving electrode 200 and the first floating electrode 300 only partially overlap each other, or the sensing electrode 500 and the second floating electrode 400 are The driving electrode 200 and the first floating electrode 300 may partially overlap each other, and the sensing electrode 500 and the second floating electrode 400 may only partially overlap each other.

Example 3

3 is a cross-sectional view of a touch sensor according to another example of the present disclosure.

Referring to FIG. 3 , the touch sensor 10 according to another example of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode ( 500 ) and an insulating layer 700 . Here, the driving electrode 200 , the first floating electrode 300 , the second floating electrode 400 , and the sensing electrode 500 may have, for example, a mesh shape.

According to another example of the present disclosure, when viewed in the B direction, the first floating electrode 300 may be disposed to partially overlap the driving electrode 200 . Also, the second floating electrode 400 may be disposed to completely overlap the sensing electrode 500 .

Example 4

4 is a cross-sectional view of a touch sensor according to another example of the present disclosure.

Referring to FIG. 4 , the touch sensor 10 according to another embodiment of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode ( 500 ) and an insulating layer 700 . Here, the driving electrode 200 , the first floating electrode 300 , the second floating electrode 400 , and the sensing electrode 500 may have, for example, a mesh shape.

According to another example of the present disclosure, when viewed in the B direction, the second floating electrode 400 may be disposed to partially overlap the sensing electrode 500 . Also, the first floating electrode 300 may be disposed to completely overlap the driving electrode 200 .

Example 5

5 is a cross-sectional view of a touch sensor according to another example of the present disclosure.

Referring to FIG. 5 , the touch sensor 10 according to another example of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode ( 500 ) and an insulating layer 700 . Here, the driving electrode 200 , the first floating electrode 300 , the second floating electrode 400 , and the sensing electrode 500 may have, for example, a mesh shape.

According to another example of the present disclosure, when viewed in the B direction, the second floating electrode 400 may be disposed to partially overlap the sensing electrode 500, and the first floating electrode 300 may be a driving electrode ( 200) and may be arranged to partially overlap.

In Examples 3 to 5 of the present disclosure described above, especially when the electrode has a mesh pattern, the first floating electrode 300 is connected to the driving electrode 200 even if the meshes of different layers do not overlap depending on the implementation or design. The second floating electrode 400 may overlap within a region corresponding to the sensing electrode 500 and overlap within the region corresponding to the sensing electrode 500 .

Example 6

6 is a cross-sectional view of a touch sensor according to another example of the present disclosure.

Referring to FIG. 6 , the touch sensor 10 according to another example of the present disclosure includes a substrate 100 , a driving electrode 200 , a first floating electrode 300 , a second floating electrode 400 , and a sensing electrode ( 500 ) and an insulating layer 700 .

Unlike the above, the first floating electrode 300 and the second floating electrode 400 may not be physically connected. That is, they may not be connected through the via hole 600 . For example, when viewed in the B direction, one region of the first floating electrode 300 and one region of the second floating electrode 400 may overlap each other. Accordingly, one region of the first floating electrode 300 and one region of the second floating electrode 400 may form a capacitor with each other.

In addition, when viewed in the B direction, the size of the cross-sectional area of the first floating electrode 300 is larger than the size of the cross-sectional area of the driving electrode 200 , and the size of the cross-sectional area of the second floating electrode 400 is the size of the sensing electrode 500 . ) may be larger than the size of the cross-sectional area.

Example 7

7 is a cross-sectional view of a touch sensor according to another example of the present disclosure.

Referring to FIG. 7 , the touch sensor 10 according to another embodiment of the present disclosure includes a substrate 100 , a driving electrode 200 , a third floating electrode 800 , a sensing electrode 500 , and an insulating layer 700 , 710, 720).

Unlike the above, the touch sensor 10 according to another example of the present disclosure may not include separate floating electrodes, but only one floating electrode, that is, the third floating electrode 800 .

The third floating electrode 800 may be disposed between the driving electrode 200 and the sensing electrode 500 . That is, the driving electrode 200 , the third floating electrode 800 , and the sensing electrode 500 may be respectively disposed on different layers.

The driving electrode 200 may be disposed at a lower end of one region of the third floating electrode 800 . The sensing electrode 500 may be disposed on top of the other region of the third floating electrode 800 . Here, one region and the other region of the third floating electrode 800 may be separate regions in the longitudinal direction of the third floating electrode 800 .

In addition, the insulating layer 700 may be provided between the driving electrode 200 and the third floating electrode 800 , and the insulating layer 710 may be provided between the third floating electrode 800 and the sensing electrode 500 . The insulating layer 720 may be provided between the substrate 100 and the third floating electrode 800 , except for the driving electrode 200 .

Although not shown, the touch sensor 10 according to various examples of the present disclosure described above may further include a cover layer (not shown) and a processor (not shown).

A cover film (not shown) is disposed on the first floating electrode 300 and the sensing electrode 500 , or is disposed on the sensing electrode 500 to contact the object. The cover layer (not shown) may protect the display device 1 from the external environment by, for example, forming an organic layer and/or an inorganic layer.

The processor (not shown) is electrically connected to the driving electrode 200 and the sensing electrode 500 . In the present disclosure, a processor (not shown) may include a driving circuit for operating the driving electrode and/or a sensing circuit for operating the sensing electrode. The processor (not shown) may apply a driving signal to the driving electrode 200 , receive a response signal to the driving signal from the sensing electrode 500 , and recognize a touch of an object based on the response signal.

display device

8 is a cross-sectional view of a display device according to an example of the present disclosure.

Referring to FIG. 8 , the display device 1 according to an example of the present disclosure includes a display substrate 2 and a touch sensor 10 .

In the present disclosure, the display device 1 may also be referred to as a touch screen integrated display device, a touch screen panel (TSP), or the like.

The display substrate 2 includes a display area and may be made of a flexible or rigid material. Here, the display area may be an area in which sub-pixels are provided to display an image. The display substrate 2 displays text, images, and images by a separate driving circuit (not shown) electrically connected to the display substrate 2 . The display board 2 may be electrically connected to the touch sensor 10 to display an event according to a touch of an object based on text, an image, an image, or the like.

The touch sensor 10 is coupled to the display substrate 2 . The touch sensor 10 may be one of Embodiments 1 to 7 of the present disclosure described above.

Experimental example

Hereinafter, experimental examples for the performance of the touch sensor according to various examples of the present disclosure described above will be described.

9A is a circuit diagram of a conventional capacitive sensor, and FIG. 9B is a circuit diagram of a touch sensor according to an example of the present disclosure.

Referring to FIGS. 9A and 9B , the touch sensor according to an example of the present disclosure includes a first floating electrode positioned at the upper end of the driving electrode and a second floating electrode positioned at the lower end of the sensing electrode in addition to the existing capacitive sensor. It may be included as described above. The driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode are represented as nodes in the circuit diagram, and a capacitor is formed between the nodes.

In this case, the impedance Z12 formed between the first floating electrode and the second floating electrode in the touch sensor according to an example of the present disclosure may be a via hole or a capacitance.

In the experimental example, common parameters C _m0 , ΔC _m , and C _rx-noise in the circuit diagram were all the same values. Table 1 shows the experimental results according to FIGS. 9A and 9B.

Here, the existing Tx and Rx touch sensors correspond to FIG. 9A, and the proposed sensor corresponds to FIG. 9B. Each variable of the item is as shown in the circuit diagram. Referring to Table 1, it can be seen that in the case of the touch sensor of FIG. 9B , in particular, the SNR characteristic is improved by more than about 100 [%] compared to the touch sensor of FIG. 9A.

As confirmed in the experimental example, as described above, the touch sensor and display device according to various examples of the present disclosure compared with the existing touch sensor and display device based on the structure and positional relationship of the driving electrode, the sensing electrode, and the floating electrode. SNR characteristics are improved.

Since examples of the proposed method in the above description may also be included as one of the implementation methods of the present disclosure, it is obvious that they may be regarded as a kind of proposed method. In addition, the above-described proposed methods may be implemented independently, but may also be implemented in the form of a combination (or merge) of some of the proposed methods.

The examples of the present disclosure disclosed as described above are provided to enable any person skilled in the art to implement the present disclosure to practice and practice the present disclosure. Although the above has been described with reference to examples of the present disclosure, those skilled in the art may variously modify and change the examples of the present disclosure. Accordingly, this disclosure is not intended to be limited to the examples set forth herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

1: display device
2: display board
10: touch sensor
100: substrate 200: driving electrode
300: first floating electrode 400: second floating electrode
500: sensing electrode 600: via hole
700, 710, 720: insulating layer

Claims (19)

Board;
a driving electrode disposed on the substrate;
a first floating electrode disposed on the driving electrode;
a second floating electrode spaced apart from the driving electrode and disposed on the substrate; and
A sensing electrode disposed on the second floating electrode,
The first floating electrode and the second floating electrode are in a floating state with the driving electrode and the sensing electrode,
touch sensor.
According to claim 1,
The first floating electrode and the second floating electrode are connected through a via hole,
touch sensor.
According to claim 1,
The first floating electrode and the second floating electrode are not physically connected to each other to form a capacitor,
touch sensor.
According to claim 1,
The driving electrode and the sensing electrode are disposed to be spaced apart from each other in layers,
touch sensor.
According to claim 1,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the driving electrode and the cross-sectional area of the sensing electrode have different sizes,
touch sensor.
6. The method of claim 5,
The size of the cross-sectional area of the sensing electrode is smaller than the size of the cross-sectional area of the driving electrode,
touch sensor.
6. The method of claim 5,
Each of the first floating electrode and the second floating electrode has a cross-sectional area corresponding to the cross-sectional area of each of the driving electrode and the sensing electrode,
touch sensor.
According to claim 1,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the first floating electrode and the cross-sectional area of the second floating electrode are different from each other having size,
touch sensor.
According to claim 1,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the first floating electrode is disposed to partially overlap the driving electrode,
touch sensor.
According to claim 1,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the second floating electrode is disposed to partially overlap the sensing electrode,
touch sensor.
According to claim 1,
a cover film disposed on the first floating electrode and the sensing electrode and in contact with an object; and
Further comprising a processor electrically connected to the driving electrode and the sensing electrode,
The processor applies a driving signal to the driving electrode, receives a response signal to the driving signal from the sensing electrode, and recognizes a touch of the object based on the response signal,
touch sensor.
a display substrate including a display area; and
a touch sensor coupled to the display substrate;
The touch sensor is:
Board;
a driving electrode disposed on the substrate;
a first floating electrode disposed on the driving electrode;
a second floating electrode spaced apart from the driving electrode and disposed on the substrate; and
A sensing electrode disposed on the second floating electrode,
The first floating electrode and the second floating electrode are in a floating state with the driving electrode and the sensing electrode,
display device.
13. The method of claim 12,
The first floating electrode and the second floating electrode are connected through a via hole,
display device.
13. The method of claim 12,
The first floating electrode and the second floating electrode are not physically connected to each other to form a capacitor,
display device.
13. The method of claim 12,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the driving electrode and the cross-sectional area of the sensing electrode have different sizes,
display device.
16. The method of claim 15,
The size of the cross-sectional area of the sensing electrode is smaller than the size of the cross-sectional area of the driving electrode,
display device.
13. The method of claim 12,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the cross-sectional area of the first floating electrode and the cross-sectional area of the second floating electrode are different from each other having size,
display device.
13. The method of claim 12,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the first floating electrode is disposed to partially overlap the driving electrode,
When viewed in a direction perpendicular to the stacking direction of the driving electrode, the first floating electrode, the second floating electrode, and the sensing electrode, the second floating electrode is disposed to partially overlap the sensing electrode,
display device.
13. The method of claim 12,
The touch sensor is:
a cover film disposed on the first floating electrode and the sensing electrode and in contact with an object; and
Further comprising a processor electrically connected to the driving electrode and the sensing electrode,
The processor applies a driving signal to the driving electrode, receives a response signal to the driving signal from the sensing electrode, and recognizes a touch of an object based on the response signal,
display device.

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