KR101553604B1 - Touch detecting apparatus and method - Google Patents

Abstract

One embodiment of the present invention is a touch detection apparatus including a plurality of sensor nodes arranged in a row or column direction, the touch detection apparatus comprising: a drive line (Tx) to which an alternate voltage is applied; A sense line Rx for outputting a voltage change in response to the alternating voltage; A charging unit that charges the sensing line and floats the sensing line; And a touch detection unit for detecting a touch through detection of a voltage change amount of the sensing line in accordance with an alternating voltage applied to the driving line in a floating state of the sensing line, wherein the sensing line corresponds to the sensor node, And the drive line corresponds to one or more sensor nodes.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch detection apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for detecting a touch, and more particularly, to a touch detection apparatus and method for detecting a touch using mutual capacitance formed by a drive line and a sense line.

The touch screen panel is a device for inputting a command of a user by touching a character or a figure displayed on the screen of the image display device with a finger or other contact means of a person, and is attached and used on the image display device. The touch screen panel converts a contact position that is touched by a human finger or the like into an electrical signal, and the converted electrical signal is used as an input signal.

As a method of implementing a touch screen panel, a resistive film type, a light sensing type, and a capacitive type are known. Among them, the capacitive touch panel converts the contact position into an electrical signal by sensing a change in the capacitance that the conductive sensing pattern forms with other peripheral sensing patterns or the ground electrode when a human hand or an object touches.

1 is an exploded top view of an example of a conventional capacitive touch screen panel.

1, the touch screen panel 1 includes a transparent substrate 2 and a first sensor pattern layer 3, a first insulating film layer 4, and a second sensor pattern layer 4 formed sequentially on the transparent substrate 2 5, a second insulating film layer 6, and a metal wiring 7.

The first sensor pattern layer 3 may be connected to the transparent substrate 2 along the transverse direction and may be formed in a regular pattern in which a plurality of diamond shapes are connected in a line, for example. The first sensor pattern layer 3 may be composed of a plurality of Y patterns formed so that the first sensor pattern layers 3 located on one row having the same Y coordinate are connected to each other. ).

The second sensor pattern layer 5 may be connected to the first insulating layer 4 along the column direction and may be formed in the same diamond shape as the first sensor pattern layer 3, for example. The second sensor pattern layer 5 is connected to the second sensor pattern layers 5 located in one row having the same X coordinate and is connected to the first sensor pattern layer 3 ). And the second sensor pattern layer 5 is connected to the metal wiring 7 on a row basis.

The first and second sensor pattern layers 3 and 5 may be made of a transparent conductive material such as indium tin oxide (ITO), and the first insulating layer 4 may be made of a transparent insulating material.

The sensor pattern layers 3 and 5 are electrically connected to the driving circuit via the metal wiring 7, respectively.

When a finger or a contact means of a person is brought into contact with the touch screen panel 1, a change in capacitance according to the contact position is transmitted to the drive circuit side through the first and second sensor pattern layers 3 and 5 and the metal wiring 7 do. Then, the contact position is recognized as the change in the capacitance transferred is converted into an electrical signal by the X and Y input processing circuits or the like.

However, the touch screen panel 1 needs to have an ITO pattern separately in each of the sensor pattern layers 3 and 5, and the insulating layer 4 must be provided between the sensor pattern layers 3 and 5, .

Further, in the related art, it is necessary to accumulate the change of the electrostatic capacity generated finely by the touch several times to detect the touch. Therefore, it is required to detect the change of the electrostatic capacitance at a high frequency.

And the prior art requires metal wiring to maintain a low resistance because the change of the capacitance must be accumulated sufficiently within a predetermined time. This metallization thickens the bezel around the rim of the touch screen and creates an additional masking process.

In addition, in a conventional touch screen panel, after applying a clock signal such as an alternating voltage (Vdrv), an output value detected by a sensor pattern is directly applied to an input of an ADC (Analog to Digital Converter) And the touch signal was obtained using the voltage variation at the time of occurrence and the touch occurrence. In this case, when a touch occurs in the sensor pattern, since the touch is detected using the touch capacitance Ct, which is the capacitance formed between the sensor patterns as a human finger or contact means touches, There is a problem that an output value detected in the sensor pattern is affected by noise and an error in touch recognition can be caused.

Accordingly, there is a demand for a method for increasing the amount of change in touching and non-touching while minimizing the influence of noise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a touch detecting apparatus and method for detecting a touch using mutual capacitance formed by a driving line and a sensing line.

According to an aspect of the present invention, there is provided a touch sensing apparatus including a plurality of sensor nodes arranged in a row or column direction, the touch sensing apparatus comprising: a driving line to which an alternating voltage is applied; A sense line Rx for outputting a voltage change in response to the alternating voltage; A charging unit that charges the sensing line and floats the sensing line; And a touch detection unit for detecting a touch through detection of a voltage change amount of the sensing line in accordance with an alternating voltage applied to the driving line in a floating state of the sensing line, wherein the sensing line corresponds to the sensor node, And the drive line corresponds to one or more sensor nodes.

According to an embodiment of the present invention, each of the sensor nodes may be alternately arranged such that the driving line and the sensing line are not overlapped with each other.

According to an embodiment of the present invention, the total area occupied by the driving line in the sensor node may be larger than the total area occupied by the sensing line.

According to an embodiment of the present invention, the thickness of the line diverging from the driving line may be greater than the thickness of the line diverging from the sensing line.

According to an embodiment of the present invention, the driving lines constituting the sensor nodes belonging to the same column or the same row can be branched from one common driving line.

According to an embodiment of the present invention, the touch detection apparatus includes a dummy line extending in the row or column direction, and the dummy line may be disposed between a row and a column of the sensor node or between a row and a row .

According to an embodiment of the present invention, each of the sensor nodes is formed as a second group including a first group including one or more lines branched from the drive line and one or more lines branched from the sense line, One of the first line belonging to the first group and the second line belonging to the second group may be at least partially surrounded by another one.

According to an embodiment of the present invention, the sensor node comprises the sensing line formed of the first comb tooth-shaped driving line having the first specific interval and the second comb tooth having the second specific interval, 2 comb teeth may be inserted between the first comb teeth so that the first comb teeth and the second comb teeth are engaged with each other.

According to an embodiment of the present invention, the sensor node includes a sensing line having a predetermined interval of a continuous H shape and a driving line having a shape corresponding to a specific distance of the sensing line, As shown in FIG.

According to an embodiment of the present invention, the sensor node includes a first spiral driving line having a specific interval and converging to a specific point in the sensor node, and a second spiral corresponding to an interval in the first spiral shape, and a sensing line in the form of a spiral, and the sensing line may be arranged to be inserted between the driving lines.

According to an embodiment of the present invention, the sensor node may comprise a sensing line having one or more branch lines that diverge radially from a specific point, and a drive line formed to surround the radial pattern of the sensing line have.

According to an embodiment of the present invention, the center of each sensor node may be arranged to be shifted by a predetermined distance in the column direction from the center of the closest sensor node among the sensor nodes disposed in adjacent columns.

According to another embodiment of the present invention, there is provided a touch detection method of a touch screen panel including a plurality of sensor nodes arranged in a row or column direction, and each of the sensor nodes is arranged so that a drive line and a sensing line are not overlapped with each other, Charging the sensing line and floating the sensing line; Applying an alternating voltage to the drive line; And detecting a touch through detection of a voltage change amount of the sensing line in accordance with an alternating voltage applied to the driving line in a floating state of the sensing line.

According to another embodiment of the present invention, each of the sensor nodes is formed as a second group including a first group including one or more lines branched from the drive line and one or more lines branched from the sense line, One of the first line belonging to the first group and the second line belonging to the second group may be at least partially surrounded by another one.

According to an embodiment of the present invention, a touch can be detected using the mutual capacitance formed by the driving line and the sensing line.

In addition, according to one embodiment of the present invention, because the mutual capacitance rather than the touch capacitance is used for the touch detection, the influence of the noise generated at the touch can be reduced to improve the accuracy of the touch recognition.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an exploded top view of an example of a conventional capacitive touch screen panel.
2 is an exemplary diagram of the mutual capacitance formed between the drive line and the sense line.
3 is an exploded top view of a touch detection device according to an embodiment of the present invention.
4 is a circuit diagram illustrating a touch detection unit according to an embodiment of the present invention.
5 is an exemplary waveform diagram of a touch detection unit according to an embodiment of the present invention.
6 and 7 are diagrams illustrating an example of a specific pattern of a sensor node according to an embodiment of the present invention.
8 is a diagram illustrating an example of disposing a sensor node according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

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

Embodiments of the present invention relate to a method of detecting whether or not a touch is generated by a change in mutual capacitance (Cm) between drive lines and sensing lines alternately arranged.

FIGS. 2A and 2B are views for explaining the touch detection method.

As shown in FIG. 2A, an electric field is formed between the two conductors in accordance with the flow of the flux, and the intrinsic capacitance, that is, the mutual capacitance Cm, is formed by these values .

2A, an arbitrary conductor (for example, a first conductor 210 and a second conductor 220) may be disposed on the upper surface of the structure including the first conductor 210 and the second conductor 220, When a contact is made by a finger or the like in the case of a constituent element of a touch screen panel (TSP), the first conductor 210 and the second conductor 210, which are proportional to the amount of electric flux absorbed by the contact object, The value of the mutual capacitance Cm between the conductors 220 is changed.

The touch screen panel according to the embodiment of the present invention can detect a touch by detecting a change in the mutual capacitance Cm between the conductors 210 and 220.

A touch screen panel that performs touch detection in this manner is called a mutual touch screen panel. Such a mutual touch screen panel includes a drive line to which a drive signal is applied and a sense line for providing a signal detection point for touch detection.

Typically, the drive line and the sense line are alternately arranged so as not to contact each other, and the drive line and the sense line may correspond to the first conductor 210 and the second conductor 220 in FIG. 2A, respectively.

FIG. 2B illustrates a situation in which a third object is located above the conductors 210 and 220 shown in FIG. 2A.

2B, when a third object, such as a finger of a person, approaches the two conductors 210 and 220, the distance between the first conductor 210 and the finger is smaller than the distance between the first conductor 210 and the finger. When the distance between the first conductor 210 and the second conductor 220 is relatively short, the total amount of flux absorbed by the finger is extremely smaller than the amount of flux transmitted between the first conductor 210 and the second conductor 220 Loses.

Therefore, the touch detection can be easily performed when the distance between the first conductor 210 and the second conductor 220 and the distance between the first conductor 210 and the touching means (such as a finger) are properly adjusted.

For example, if the distance between the first conductor and the finger is assumed to be 'D', the distance between the first conductor and the second conductor can be maintained at a half of the 'D' distance.

In another embodiment of the touch detection method, there is a touch detection method of detecting a touch using the touch capacitance formed between the first conductor and the finger or between the second conductor and the finger. However, such a method has a problem that it affects the detection of the touch capacitance due to the touch noise generated when the finger or the like touches.

According to an embodiment of the present invention, if a touch is detected using the mutual capacitance Cm formed between the first conductor and the second conductor instead of the touch capacitance, the influence on the touch noise can be minimized . This is because the mutual capacitance Cm is formed between the conductor and the conductor, unlike the touch capacitance caused by the contact of the finger.

Hereinafter, the first conductor 210 and the second conductor 220 are applied to a drive line and a sense line constituting a sensor node, which may be referred to as a touch detection unit area of a touch screen panel, The line 220 will be replaced with the reference numerals.

3 is an exploded top view of a touch detection device according to an embodiment of the present invention.

Referring to FIG. 3, the touch sensing apparatus 100 includes a sensor node 200 and a touch sensing unit 300.

The touch sensing apparatus 100 may include one or more sensor nodes 200 arranged in a row or column direction.

The sensor node 200 may be regarded as a unit region for touch sensing formed by alternately arranging the driving line 210 and the sensing line 220. For example, the mutual capacitance Cm formed between the driving line 210 and the sensing line 220 may be changed through a touch input tool such as a finger or a conductive material to contact the sensor node 200, Thus, the touch can be detected.

A power supply (for example, an alternating voltage) is applied to the driving line 210, and the sensing line 220 is an area for touch detection. For example, the alternating voltage alternating at a predetermined frequency is applied to the driving line 210, and the sensing line 220 outputs a signal corresponding to the touch state of the touch input tool in response to the alternating voltage. In one example, the sense line 220 may output a different voltage level value in response to the alternating voltage, when the touch occurs and not. This can be attributed to the variation of the mutual capacitance Cm formed by the drive line 210 and the sense line 220 with each other.

The sensing line 220 may correspond to the sensor node 200 and the driving line 210 may correspond to the one or more sensor nodes 200. For example, as shown in FIG. 3, a sensing line 220 corresponding to each of the sensor nodes 200 is connected to a corresponding one of the sensor nodes 200 disposed in the same column, The driving lines 210 may be connected to each other so that one signal line may be connected so that an alternating voltage is commonly applied.

The sensor node 200 is alternately arranged such that the driving line 210 and the sensing line 220 do not overlap with each other. The driving line 210 and the sensing line 220 form a geometric pattern such as a comb-like pattern, an antenna pattern, and a spiral pattern in the sensor node 200. This will be described later with reference to Figs. 6 and 7. Fig.

The driving device 30 for driving the touch sensing device 100 may be formed on a circuit board such as a printed circuit board or a flexible circuit film, but not limited thereto, and may be directly mounted on a part of the substrate or the cover glass. The driving device 30 may include a touch detection unit 300, a touch information processing unit 302, a memory 304 and a control unit 306 and may be implemented as one or more integrated circuit (IC) The detection unit 300, the touch information processing unit 302, the memory 304, and the control unit 306 may be separated, or two or more components may be integrated.

The touch detection unit 300 may include a plurality of switches and a plurality of capacitors connected to the sensor node 200 and the signal line. The touch detection unit 300 receives signals from the control unit 306 to drive circuits for touch detection, And outputs a corresponding voltage. The touch sensing unit 300 may include an amplifier and an analog-to-digital converter. The touch sensing unit 300 may convert, amplify, or digitize the voltage variation of the sensor node 200 and store the converted difference in the memory 304.

The touch detection unit 300 can detect a touch by detecting a change in the mutual capacitance Cm formed between the driving line 210 and the sensing line 220 according to the application of the alternating voltage.

The touch information processing unit 302 processes the digital voltage stored in the memory 304 to generate necessary information such as touch state, touch area and touch coordinates.

The control unit 306 controls the touch detection unit 300 and the touch information processing unit 302. The control unit 306 may include a micro control unit (MCU), and may perform predetermined signal processing through the firmware.

The memory 304 stores the digital voltage based on the difference in the voltage change detected from the touch detection unit 300, predetermined data used for touch detection, area calculation, touch coordinate calculation, or data received in real time.

FIG. 4 is a circuit diagram illustrating a touch detection unit 300 according to an embodiment of the present invention, and FIG. 5 is an exemplary waveform diagram of a touch detection unit 300 according to an embodiment of the present invention.

The touch detection unit 300 may include a charging unit 310 and an alternating voltage generation unit 320.

Referring to FIG. 4, the charging unit 310 charges the sensing line 220 and charges the sensing line 220. More specifically, the charging unit 310 is connected to the sensing line 220 to supply the charging signal Vb. The charging unit 310 may be a three-terminal switching device that performs a switching operation in response to a control signal supplied to an on / off control terminal, or may be a linear device such as an OP-AMP that supplies a signal in accordance with a control signal.

The alternating voltage generator 320 applies an alternating voltage to the driving line 210. That is, the alternating voltage generating unit 320 applies the alternating voltage alternating at a predetermined frequency to the output terminal of the driving line 210 to vary the electric potential. The alternating voltage generator 320 may generate a clock signal having the same duty ratio, but may generate an alternating voltage having a different duty ratio.

If the charging signal Vb is applied to the input terminal of the charging unit 310 while the charging unit 310 is turned on, the sensing line 220 is charged. Thereafter, when the charging unit 310 is turned off, the signal charged in the sensing line 220 is isolated in a charged state unless it is discharged separately. This isolated state is referred to as a floating state.

That is, the floating state means a state in which the charged state is isolated from the charged state until the charged signal is turned off by turning on the charging unit 310 to turn off the charging unit 310 and discharging the charged signal separately.

In this case, the input terminal of the sensing line 220 may have a high impedance in order to stably isolate the charged electric charge. For this, the thickness of at least one line branched from the sensing line 220 disposed at the sensor node 200 may be made smaller than the thickness of one or more lines branched at the driving line 210, have.

5, when the alternating voltage supplied to the driving line 210 increases from 0 V to 5 V, for example, when the sensing line 220 is in the floating state, the output voltage at the output node of the sensing line 220 The voltage Vo is instantaneously increased, and when the alternating voltage again drops from 5V to 0V, the level of the output voltage Vo drops instantaneously. The rise and fall of the voltage level at this time will have different values depending on the connected capacitance. The change in the rise or fall of the voltage level depending on the capacitance connected to it is sometimes referred to as "kick-back".

Referring to FIGS. 4 and 5, a method of detecting a touch generated on a touch screen panel will be described.

First, the charger 310 charges the sensing line 220 by applying a charging signal Vb. The charge signal Vb may continuously hold a high signal, or may be in the form of a clock signal having a certain frequency, as shown in Fig.

The charging signal Vb may be applied to charge the sensing line 220 when the switch SW of the charging unit 310 is turned on. The switch SW has a predetermined frequency and can be switched on / off.

Thereafter, when the switch SW is turned off, the charging signal Vb is charged in the sensing line 220 and can be isolated from the charged state to a floating state.

At this time, when the level of the alternating voltage (KB) supplied to the driving line 210 is changed, the level of the output node voltage Vo of the sensing line 220 is changed. For example, when the alternating voltage (KB) falls from 5V to 0V, the output node voltage Vo of the sensing line 220 also falls, and conversely, when the alternating voltage (KB) The output node voltage Vo of the line 220 also rises.

Assuming that no touch is generated, when the alternating voltage KB supplied to the driving line 210 in the floating state of the sensing line 220 drops to 0 V, the output node voltage Vo of the sensing line 220 is instantaneously .

Assuming that the touch occurs, when the alternating voltage applied to the driving line 210 falls to 0 V in the floating state of the sensing line 220, the output node voltage Vo of the sensing line 220 falls The lowering width is formed to be smaller than that in the case where no touch occurs.

5, when the alternating voltage KB is applied to the driving line 210 while the sensing line 220 is maintained in the floating state, the voltage of the output node Vo of the sensing line 220 It can be seen that the change amount? V appears differently between non-touch and touch. This is because the amount of change ΔV of the output node voltage of the sensing line 220 when the touch is generated or not by the change of the mutual capacitance Cm formed between the sensing line 220 and the driving line 210, This is because the values are different.

5, even if the switch SW is turned on / off and the alternating voltage applied to the driving line 210 is activated at the same timing, the voltage change amount The same signal of the inside of the touch detection apparatus 100 (for example, a controller or the like) can be used.

A method of detecting a touch using the touch capacitance Ct affects an output voltage Vo detected by the sensor node 200 due to a touch noise generated when a finger or the like touches the touch, The sensing device 100 can reduce the influence of the touch noise by allowing the mutual capacitance Cm formed by the driving line 210 and the sensing line 220 to replace the touch capacitance Ct. Therefore, the touch sensing apparatus 100 according to the embodiment of the present invention can detect the touch in accordance with the change of the mutual capacitance Cm in place of the touch capacitance Ct.

6 and 7 are diagrams illustrating an example of a specific pattern of a sensor node according to an embodiment of the present invention. FIG. 6 shows a specific pattern in one sensor node, and FIG. 7 shows a state of sensor nodes arranged in four rows and four columns.

As described above, the driving line 210 and the sensing line 220 included in the touch screen panel according to the embodiment of the present invention are alternately arranged so as not to overlap each other.

6 and 7, each of the sensor nodes 200 includes a first group including one or more lines branched from the driving line 210 and a second group including one or more lines branched from the sensing line 220 One of the first line belonging to the first group and the second line belonging to the second group is formed at least partially surrounded by the other.

Meanwhile, the total area occupied by the driving line 210 in one sensor node 220 may be larger than the total area occupied by the sensing line 220. In other words, the thickness of the one or more lines diverging from the drive line 210 may be greater than the thickness of the one or more lines diverging from the sense line 220.

This is for the following reasons. As described above, according to the embodiment of the present invention, in order to detect whether or not a touch is generated, the sensing line 220 must be charged and then maintained in a floating state for a predetermined time. Since the floating state is vulnerable to external noise, The output terminal of the sensing line 220 must have a high impedance. Thus, if the thickness of one or more lines diverging from the sensing line 220 is less than the thickness of one or more lines diverging from the driving line 210, the sensing line 220 may have a high impedance, .

As shown in FIG. 6 (a), the sensor node 200 may have a comb-like pattern. The sensor node 200 includes a first comb-shaped driving line 210 having a first specific interval and a second comb-shaped sensing line 220 having a second specific interval. At this time, the second comb pattern may be inserted between the first comb patterns so that the first comb pattern and the second comb pattern are engaged with each other.

As shown in FIG. 6 (b), the sensor node 200 may have an antenna pattern. The sensor node 200 includes a sensing line 220 having a predetermined interval of a continuous H shape and a driving line 210 having a shape corresponding to a specific distance of the sensing line 220, Line 220, as shown in FIG.

As shown in FIG. 6 (c), the sensor node 200 may have a spiral pattern. The sensor node 200 includes a spiral-shaped driving line 210 that converges to a specific point in the sensor node 200 at a specific interval, and an interval between the driving line 210 and the spiral- And the sensing line 220 may be arranged to be interposed between the driving lines 210. The sensing line 220 may be formed of a conductive material,

As shown in FIG. 6 (d), the sensor node 200 may have a geometric pattern. A sensing line 220 having one or more branch lines that diverge radially from a particular point in the sensor node 220 and a sensing line 220 that is formed to surround the radial pattern of sensing line 220. [ (210). In addition, one or more lines perpendicular to the longitudinal direction of the branch line may be formed in each branch line forming the radial shape of the sensing line 220.

FIG. 7 is a diagram in which the sensor node 200 in FIG. 6 is extended to a 4x4 matrix and corresponds to FIG. 6 from (a) to (d).

Referring to FIG. 7, the driving lines 210 constituting the sensor nodes 200 belonging to the same column can be branched from one common driving line. For example, as shown in FIG. 7, among the driving lines included in the touch sensing device 100, the driving lines arranged in the same column may be connected to each other and an alternating voltage may be commonly applied.

On the other hand, the sensing line 220 may be formed independently for each sensor node 200.

7 (a), the touch sensing apparatus 100 may include a dummy line 230 extending in the column direction. The dummy line 230 may be disposed between the rows and columns of the sensor node 200. Here, arranging the dummy lines is for preventing interference (for example, influence of parasitic capacitance or the like due to the relationship between the sensor nodes 200) that may exist in the relationship between the adjacent sensor nodes 200.

6 and 7 show an example of a pattern formed by the driving line 210 and the sensing line 220 in the sensor node 200, the embodiment of the present invention is not limited to this, and the driving line 210 And one or more of the lines branched from the sensing line 220 are arranged so that the lines do not overlap with each other to form a certain pattern.

8 is a diagram illustrating an example of disposing a sensor node according to another embodiment of the present invention.

8A and 8B show only a part of the sensor node included in the touch sensing apparatus 100 to explain the arrangement of the sensor node.

FIG. 8A is arranged in the same manner as the sensor node shown in FIG. 7A, and the centers of the sensor nodes are arranged in the same position in the row direction and the column direction.

FIG. 8B shows the positions of the sensor nodes shown in FIG. 7A are different from each other. Specifically, although each of the sensor nodes is arranged side by side in the column direction, the sensor nodes are not located in the same row as adjacent sensor nodes in the row direction, but are arranged to be shifted by a predetermined distance. For example, the center of a specific sensor node may be shifted from the center of the nearest sensor node disposed in an adjacent column by a predetermined distance in the column direction. The predetermined interval may be about 1/2 of the length in the column direction of the sensor node, but it is not limited thereto.

A description will be given of the difference between (a) and (b) of FIG. 8, taking as an example a case where a touch to the sensor node occurs.

It is assumed that a touch occurs at the same point in Figs. 8 (a) and 8 (b). The point where the touch is made is referred to as a touch area (TA). First, if a sensor node is arranged in a pattern as shown in FIG. 8A, the touch area TA is spread over two sensor nodes. At this time, the touch is detected from the change of the mutual capacitance Cm formed at each of the two corresponding sensor nodes.

On the other hand, if the sensor node is arranged in a pattern as shown in FIG. 8B, the touch region TA is spread over three sensor nodes, and the mutual capacitance Cm formed in each of the three corresponding sensor nodes The touch is detected from the change.

Therefore, when a touch occurs at the same point, the touch region TA in the shape (Figure 8B) in which the sensor nodes are arranged at least partially offset from the shape (Figure 8A) in which the sensor nodes are arranged side by side in the row and column directions, Is spread over more sensor nodes, and thus the occurrence of touch is detected from more sensor nodes, the accuracy of touch detection can be further improved.

A touch sensing apparatus according to an embodiment of the present invention includes a sensing line 220 and a sensing line 220 as a sensor node 200. A touch is detected through a change in mutual capacitance Cm , It is possible to minimize the influence of the touch noise generated at the time of touch.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (14)

A touch detection apparatus comprising a plurality of sensor nodes arranged in a row or column direction,
A driving line Tx to which an alternating voltage is applied;
A sense line Rx for outputting a voltage change in response to the alternating voltage;
A charging unit that charges the sensing line and floats the sensing line; And
And a touch detection unit that detects a touch by detecting a voltage change amount of the sensing line in accordance with a mutual capacitance change between the driving line and the sensing line as the alternate voltage is applied to the driving line,
Wherein the sensing line corresponds to the sensor node, and the driving line corresponds to one or more sensor nodes.
The method according to claim 1,
Wherein each of the sensor nodes is alternately arranged such that the driving line and the sensing line are not overlapped with each other.
3. The method of claim 2,
Wherein a total area occupied by the driving line in the sensor node is larger than a total area occupied by the sensing line.
The method of claim 3,
Wherein a thickness of a line branched from the drive line is larger than a thickness of a line branched from the sense line.
The method according to claim 1,
Wherein driving lines constituting sensor nodes belonging to the same column or the same row are branched from one common driving line.
The method according to claim 1,
Wherein the touch detection device includes a dummy line extending in the row or column direction,
Wherein the dummy line is disposed between a row and a column of the sensor node or between a row and a row of the sensor node.
The method according to claim 1,
Each of the sensor nodes is formed as a second group including a first group including one or more lines branched from the drive line and one or more lines branched from the sense line,
Wherein one of the first line belonging to the first group and the second line belonging to the second group is at least partially surrounded by another one.
The method according to claim 1,
Wherein the sensor node comprises the drive line formed of a first comb tooth pattern having a first specific interval and the detection line formed of a second comb tooth pattern having a second specific gap and the second comb tooth pattern is formed of the first comb tooth pattern And the first comb-stripe and the second comb-stripe are disposed so as to mesh with each other.
The method according to claim 1,
Wherein the sensor node comprises a sensing line having a predetermined interval of a continuous H shape and a driving line having a shape corresponding to a specific distance of the sensing line, the driving line being arranged to be inserted between the sensing lines, .
The method according to claim 1,
The sensor node includes a first spiral drive line that converges to a specific point within the sensor node at a specific interval and a second spiral sensing line corresponding to an interval in the first spiral shape And the sensing line is arranged to be inserted between the driving lines.
The method according to claim 1,
Wherein the sensor node comprises a sensing line having at least one branch line branched radially from a specific point, and a drive line formed to surround the branch line.
The method according to claim 1,
Wherein the center of each of the sensor nodes is arranged to be shifted by a predetermined distance in the column direction from the center of the closest sensor node among the sensor nodes disposed in adjacent columns.
A touch detection method of a touch screen panel including a plurality of sensor nodes arranged in a row or column direction and each of the sensor nodes being arranged so that a driving line and a sensing line are not overlapped with each other,
Charging the sensing line and floating the sensing line;
Applying an alternating voltage to the drive line; And
Detecting a touch by detecting a voltage change amount of the sensing line according to a mutual capacitance change between the driving line and the sensing line in accordance with the alternating voltage applied to the driving line.
14. The method of claim 13,
Each of the sensor nodes is formed as a second group including a first group including one or more lines branched from the drive line and one or more lines branched from the sense line,
Wherein one of the first line belonging to the first group and the second line belonging to the second group is at least partially surrounded by another one.

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