KR101461926B1 - Touch detecting apparatus and method for reducing parasitic capacitance - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a touch detection apparatus of a touch panel including a plurality of sensor nodes formed by a plurality of drive lines and sensing lines, wherein a specific sensor node Wherein the attenuation unit is configured to apply an output voltage of a specific sensing line including the specific sensor node to the other sensor node at a time of detection of the specific sensor node, wherein the attenuation unit attenuates parasitic capacitance generated in other sensor nodes except for the specific sensor node A touch detection device is provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a TOUCH DETECTING APPARATUS AND METHOD FOR REDUCING PARASITIC CAPACITANCE,

The present invention relates to an apparatus and method for detecting a touch, and more particularly, to a touch detection apparatus and method for applying an output terminal voltage of a sensor node that detects a touch to another sensor node to attenuate a parasitic capacitance.

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, a touch screen panel 10 includes a transparent substrate 12 and a first sensor pattern layer 13, a first insulating layer 14, and a second sensor pattern layer (not shown) sequentially formed on a transparent substrate 12 15, a second insulating film layer 16, and a metal wiring 17.

The first sensor pattern layer 13 may be connected on the transparent substrate 12 along the lateral direction and connected to the metal wiring 17 on a row-by-row basis.

The second sensor pattern layer 15 may be connected to the first insulating layer 14 along the column direction and alternately arranged with the first sensor pattern layer 13 so as not to overlap the first sensor pattern layer 13 . In addition, the second sensor pattern layer 15 is connected to the metal wiring 17 on a row basis.

When a human finger or a contact means is brought into contact with the touch screen panel 10, a change in capacitance according to the contact position is transmitted to the drive circuit side through the first and second sensor pattern layers 13 and 15 and the metal wiring 17 do. Then, the contact position is determined as the change in capacitance transferred is converted into an electrical signal.

The first sensor pattern layer 13 and the second sensor pattern layer 15 are formed of a conductor and each sensor pattern layer may be arranged with a plurality of lines connected in a row or column direction on the substrate, The touching panel 10 can be made to touch the touch screen panel 10 by changing the capacitance formed by the lines in the row direction arranged in the pattern layer 13 and the lines in the column direction arranged in the second sensor pattern layer 15. [ It is possible to grasp the contact and its position. However, since the distance between the respective lines is very close, capacitances are generated not only at the position where the contact occurs but also around the position where the contact occurs, so that the capacitances generated around the contact position can act as parasitic capacitances. Such a parasitic capacitance causes a problem of deteriorating the accuracy of detecting whether or not a touch is generated and adversely affects it. Therefore, there is a need for a technique for minimizing such parasitic capacitance to prevent errors in touch detection.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art.

It is also an object of the present invention to improve the sensitivity of touch detection by attenuating the parasitic capacitance generated at the sensor node in a touch detection apparatus including a plurality of sensor nodes.

According to an aspect of the present invention, there is provided a touch sensing apparatus for a touch panel including a plurality of sensor nodes formed by a plurality of driving lines and a plurality of sensing lines, The sensor node includes a sensor node, a sensor node, and a sensor node. The sensor node includes a sensor node, a sensing node, and a sensor node. So that the output terminal voltage of the sensor node is applied to the other sensor node.

According to an embodiment of the present invention, a touch sensing operation may be performed by detecting a voltage change amount of the specific sensing line in accordance with an alternating voltage applied to a specific driving line including the specific sensor node, And may further include a detection unit.

According to an embodiment of the present invention, the touch detection unit includes: a charging unit that charges the specific sensing line and floats the sensing line; And an alternating voltage generator for applying an alternating voltage to the specific driving line.

According to an embodiment of the present invention, the attenuator includes a buffer, an input end of the buffer is connected to an output end of the specific sensing line, and an output end of the buffer is connected to a driving line and a sensing line included in the specific sensor node. But may be connected to other drive lines and sense lines except for.

According to another embodiment of the present invention, there is provided a touch detection apparatus of a touch panel including a plurality of sensor nodes formed by a plurality of drive lines and a plurality of sensing lines, And an attenuation unit that attenuates a parasitic capacitance generated in another sensor node adjacent to the node, wherein the attenuation unit outputs the output voltage of a specific sensing line including the specific sensor node to the other sensor node And to be applied to the drive line and the sense line included.

According to another embodiment of the present invention, there is provided a touch detection method of a touch panel including a plurality of sensor nodes formed by a plurality of drive lines and a plurality of sensing lines, Attenuating a parasitic capacitance generated in a sensor node other than a node; And a step of detecting whether or not a touch is detected on the basis of a difference in an output terminal voltage of the specific sensor node, wherein the attenuating step is performed such that an output terminal voltage of the specific sensing line including the specific sensor node is applied to the other sensor node , And a touch detection method.

According to another embodiment of the present invention, the detecting step may include detecting a voltage change amount of the specific sensing line according to an alternating voltage applied to a specific driving line including the specific sensor node in a floating state of the specific sensing line And detecting the touch.

According to another embodiment of the present invention, the touch detection step may include floating the specific sensing line after charging the specific sensing line; And applying an alternating voltage to the specific drive line.

According to another embodiment of the present invention, the attenuation step includes a buffer, an input end of the buffer is connected to an output end of the specific sensing line, and an output end of the buffer is connected to a driving line and a sensing line Respectively, to the other drive lines and sense lines.

According to an embodiment of the present invention, in a touch sensing apparatus including a plurality of sensor nodes, by applying an output terminal voltage of a sensor node to be detected to another sensor node, the parasitic capacitance can be attenuated, Can be improved.

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 a diagram illustrating a structure of a touch detection apparatus according to an embodiment of the present invention.
4 is a view illustrating an example of attenuating parasitic capacitance according to an embodiment of the present invention.
5 is a circuit diagram illustrating a touch detection unit according to an embodiment of the present invention.
6 is an exemplary waveform diagram of a touch detection unit according to an 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 touch detection scheme that improves touch sensitivity by attenuating parasitic capacitance.

Hereinafter, a touch detection method using mutual capacitance (Cm) generated between drive lines and sense lines alternately arranged will be described.

2 is an exemplary diagram of the mutual capacitance formed between the drive line and the sense line.

As shown in FIG. 2, an electric field is formed between the two conductors according to the flow of the flux, and the intrinsic capacitance between the two conductors, that is, mutual capacitance Cm is formed by this value .

2, an arbitrary conductor (for example, a first conductor 210 and a second conductor 220) may be disposed on a top 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.

The driving line and the sensing line are alternately arranged so as not to contact each other. The driving line and the sensing line may correspond to the first conductor 210 and the second conductor 220 in FIG. 2, respectively.

3 is a diagram illustrating a structure of a touch detection apparatus according to an embodiment of the present invention.

Referring to FIG. 3, a touch sensing apparatus according to an embodiment of the present invention includes a touch panel 100 and a driving apparatus 200.

The touch panel 100 includes a plurality of sensor nodes 110. The sensor nodes 110 include a plurality of driving lines 120, a plurality of sensing lines 130 arranged in a direction crossing the plurality of driving lines, A plurality of driving lines 120 and a plurality of sensing lines 130 may be formed by arranging a plurality of diamond shapes or bar shapes in a row As shown in FIG. 3 illustrates a mutual touch panel 100 in which the driving line 120 and the sensing line 130 are formed on different layers. However, the present invention is not limited to this, The line 130 includes a mutual touch panel formed in the same layer.

The sensor node 110 may be formed of two pattern layers. That is, the first pattern layer may include a plurality of driving lines 120 connected to the substrate along the column direction, and may be connected to signal lines (not shown) on a column basis. In addition, the second pattern layer may include a plurality of sensing lines 130 connected along the row direction, and may be connected to signal lines (not shown) on a row-by-row basis. Here, an insulating layer made of an insulating material may be interposed between the first pattern layer and the second pattern layer. At this time, the directions in which the drive line and the sense line are disposed may be mutually changed. That is, a plurality of sensing lines may be arranged in the column direction, and a plurality of driving lines may be arranged in the row direction.

As another example, the sensor node 110 may include a pattern in the row direction and a pattern in the column direction on one substrate, and an insulating material may be formed in a portion where the pattern in the row direction intersects the pattern in the column direction.

The driving line 120 is applied with a power supply (for example, an alternating voltage), and the sensing line 130 is an area for touch detection. For example, the alternating voltage alternating at a predetermined frequency is applied to the driving line 120, and the sensing line 130 outputs a signal corresponding to the touching state in response to the alternating voltage.

Meanwhile, the driving apparatus 200 includes a touch detection unit 210 and an attenuation unit 220.

The touch detection unit 210 detects whether or not a touch is generated due to a change in mutual capacitance Cm generated between the sensing line 130 and the driving line 120 forming the sensor node 110, do. For example, in the case of detecting whether a specific sensor node is touched, the touch detection unit 210 may measure the mutual capacitance Cm generated between the driving line and the sensing line included in the specific sensor node. At this time, the alternate voltage may be applied to the driving line including the specific sensor node.

The attenuation unit 220 supplies an output terminal voltage of a specific sensing line including a specific sensor node, which is a current sensing target of the plurality of sensor nodes 110, to another sensor node. Therefore, the attenuation unit 220 can attenuate the parasitic capacitance Cp generated at other sensor nodes except for the specific sensor node to be detected or not, among the plurality of sensor nodes. The parasitic capacitance Cp means a capacitance attached to the sensor node 110 and is a kind of parasitic capacitance formed by the sensor node 110, the signal wiring 120, and the like. The parasitic capacitance Cp may include any parasitic capacitance generated by the touch detection unit 210, the touch panel, and the image display device.

As described above with reference to FIG. 2, the mutual capacitance Cm generated at the sensor node is used to detect whether or not the touch is present. However, in the case of the touch panel 100 shown in FIG. 3, mutual capacitance Cm 'occurs not only in a specific sensor node to be touched, but also in other sensor nodes, And the sum of the mutual electrostatic capacitances (Cm ') generated acts as the parasitic capacitance. For example, when the touch target is the 'Tx2Rx2' sensor node, mutual capacitance Cm is generated between the driving line Tx2 and the sensing line Rx2 crossing the 'Tx2Rx2' sensor node, Tx1Rx1, Tx1Rx2, ..., TxnRxn in which the driving lines Tx1, Tx2, Tx3, ..., Txn and the sensing lines Rx1, Rx2, Rx3, ..., Rxn cross each other, The mutual capacitances Cm 'generated in other sensor nodes other than the specific sensor node to be touched or not are detected by touching the specific sensor node with respect to the parasitic capacitance (Cm'). Cp).

Accordingly, in the present invention, it is possible to attenuate the parasitic capacitance Cp using the attenuator 220 to improve the touch sensitivity. This will be described with reference to FIG.

First, the principle of generating the capacitance will be described as follows.

When the vicinity of a conductor charged with different polarities is surrounded by a material having a permittivity (?), The amount Q of charges collected on the conductor depending on the magnitude of the potential between the respective conductors is referred to as a capacitance (C). That is, the electrostatic capacitance C can be expressed by the following equation (1).

[Equation 1]

C =? * A / d

Referring to Equation (1), the capacitance C is proportional to the area A of the conductor and inversely proportional to the distance d between the conductors.

3, a dielectric material such as glass or OCA is present between the first pattern layer and the second pattern layer of the sensor node, and the first pattern layer and the second pattern layer are in contact with each other It is insulated through these dielectric materials. The driving line or the sensing line arranged in the first pattern layer and the second pattern layer is formed of a conductor, and the touch detection device has a structure including a plurality of conductors and a dielectric material existing in the periphery thereof, that is, Structure.

Unwanted capacitance is formed by the width of each conductor (drive line or sensing line), the distance between conductors, and the dielectric constant (?) Of the dielectric material existing between the conductors, and this capacitance is the parasitic capacitance (Cp) do. For example, the mutual capacitances Cm 'generated by the sensor nodes other than the mutual capacitance Cm of the specific sensor nodes may be the parasitic capacitance Cp.

Particularly, in the touch screen panel in which the driving lines and the sensing lines included in the plurality of sensor nodes are densely arranged in rows or columns, the arrangements of the conductors are very dense and many are distributed. Therefore, the parasitic capacitance Cp) becomes very large. Accordingly, attenuation or compensation of such a parasitic capacitance Cp is an important factor affecting performance related to touch detection in a touch screen panel.

FIG. 4 illustrates an example of the attenuation unit 220 for attenuating the parasitic capacitance according to an embodiment of the present invention, and is a view for explaining the principle of parasitic capacitance attenuation.

4, the attenuator 220 outputs the output voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2, which is the current sensing target among the plurality of sensor nodes, to the other sensor nodes Tx1Rx1, Tx1Rx2, ..., TxnRxn. That is, the attenuation unit 220 outputs the output terminal voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2, which is the current touch target of the plurality of sensor nodes, to the driving line Tx2 and the sensing line Rx2 and to the sensing lines Rx1, Rx3, ..., Rxn, respectively.

The attenuator 220 is connected to each of the drive lines Tx1, Tx2, Tx3, ..., Txn or each of the sense lines Rx1, Rx2, Rx3, ..., Rxn, And may include a buffer 221. 4, the output terminal voltage of the specific sensing line including the sensor node currently selected as the touch sensing object is input to the other driving line and the sensing lines via the buffer 221 of the attenuation unit 220. [ That is, the input terminal of the buffer 221 is connected to the output terminal of the specific sensing line Rx2 including the sensor node Tx2Rx2 which is the current touch detection object, the output terminal of the buffer 221 is connected to the specific driving line Tx2, Txn and sensing lines Rx1, Rx3, ..., Rxn except for the sensing line Rx2, respectively.

The output terminal voltage of the specific sensing line Rx2 including the specific sensor node Tx2Rx2 is different from the driving line Tx2 crossing the specific sensor node Tx2Rx2 and the other driving line Tx2 excluding the sensing line Rx2 Tx1, Tx3, ..., Txn and the sense lines Rx1, Rx3, ..., Rxn, but may be supplied to the drive line and the sense line, which are part of them. For example, the attenuator 220 outputs the output voltage of the specific sensing line Rx2 including the specific sensor node Tx2Rx2 to the driving lines Tx1 and Tx3 that intersect the other sensor nodes adjacent to the specific sensor node Tx2Rx2. And the sense lines Rx1 and Rx3.

The reason why the parasitic capacitance is attenuated by the attenuation unit 220 will be described below.

In a capacitor structure composed of two conductors and a dielectric material existing therebetween, the amount of charge Q to be filled in the structure can be expressed by an equation such as Q = CV. Where C is the capacitance value of the structure and V is the potential difference between both conductors.

In the above equation, when the voltage V is converged close to zero, the amount of charge Q drawn by the inter-conductor potential difference can be converged close to zero. Since the electrostatic capacitance C is proportional to the charging ability of the electric charge, if the electric charge quantity Q to be charged becomes close to 0, the electrostatic capacity C formed by the inter-conductor relation also converges to zero.

Referring to FIG. 4 again, the embodiment of the present invention utilizes the above-described principle. When touching or detecting a specific sensor node Tx2Rx2, the sensing line Rx2 including the sensor node Tx2Rx2, The potentials of the drive lines Tx1, Tx3, ..., Txn and the sense lines Rx1, Rx3, ..., Rxn existing in the vicinity are controlled to be close to the same level to control the parasitic capacitance Cp ) To be close to '0'.

4, the output terminal voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2, which is the current touch sensing target, among the sensor nodes is connected to the buffer 221 of the attenuation unit 220 Rx2, Rx3, ..., Rxn except for the specific drive line Tx2, the specific sense line Rx2 and the other drive lines Tx1, Tx3, ..., Txn and the sense lines Rx1, The potential difference between the other driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn is minimized, and thus the parasitic capacitance generated at the sensor node can be effectively attenuated.

Therefore, the mutual capacitance Cm 'formed at the portion of the parasitic capacitance Cp most contributing to the sensor node other than the specific sensor node can be minimized through the attenuation unit 220.

On the other hand, the buffer 221 is connected to the sensing line Rx2 including the sensor node Tx2Rx2, which is the current touch target, or the sensing lines Rx1, Rx3, ..., Txn, Rxn), a signal is adjusted, and an interference is prevented. At this time, the output terminal voltage of the sensing line Rx2 including the sensor node Tx2Rx2 to be detected is directly applied to the other driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn Since the potential between the sensor nodes must be made the same level, the gain of the buffer amplifier should be 1, but it may be changed as needed. That is, the gain of the buffer 221 included in the attenuation unit 220 may be changed to bring the potential difference between the sensor nodes close to zero.

According to the embodiment of the present invention, the generation of parasitic capacitance caused by other sensor nodes can be suppressed by the attenuation unit 220, thereby minimizing the parasitic capacitance, Can be improved.

FIG. 5 is a circuit diagram illustrating a touch detection unit according to an embodiment of the present invention, and FIG. 6 is an exemplary waveform diagram of a touch detection unit according to an embodiment of the present invention.

The touch detection unit 210 may include a charging unit 212 and an alternating voltage generation unit 214.

Referring to FIG. 5, the charger 212 floats the sensing line 130 after charging. Specifically, the charger 212 is connected to the sensing line 130 to supply the charging signal Vb. The charging unit 212 may be a three-terminal switching element that performs a switching operation in response to a control signal supplied to an on / off control terminal, or may be a linear element such as an OP-AMP that supplies a signal in accordance with a control signal.

The alternating voltage generator 214 applies an alternating voltage (KB) to the driving line 120. That is, the alternating voltage generating unit 214 applies the alternating voltage (KB) alternating at a predetermined frequency to the output terminal of the driving line 120 to vary the electric potential. The alternating voltage generator 214 may generate a clock signal having the same duty ratio but may generate an alternating voltage having a different duty ratio.

When the charge signal Vb is applied to the input terminal of the charger 212 while the charger 212 is turned on, the sense line 130 is charged. Thereafter, when the charging unit 212 is turned off, the charged signal in the sensing line 130 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 212 to turn off the charging unit 212 and discharging the charged signal separately.

At this time, the input terminal of the sensing line 130 may have a high impedance in order to stably isolate the charged charge. For this, the thickness of at least one line branched from the sensing line 130 disposed at the sensor node 110 may be made smaller than the thickness of at least one line branched from the driving line 120 so as to have a high impedance have.

Referring to FIG. 6, when the alternating voltage KB supplied to the driving line 120 increases from 0 V to 5 V, for example, when the sensing line 130 is in a floating state, The output voltage Vo of the output voltage Vo is momentarily increased. When the alternating voltage again falls from 5V to 0V, the level of the output voltage Vo is instantaneously decreased. 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. 5 and 6, a method of detecting a touch generated on a touch screen panel will be described.

First, the charger 212 charges the sensing line 130 by applying a charging signal Vb. The charge signal Vb may continuously maintain 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 130 when the switch SW of the charging unit 212 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 line Vb may be isolated from the charging line Vb in the sensing line 130 and may be in a floating state.

At this time, when the level of the alternating voltage (KB) supplied to the driving line 120 is changed, the level of the output node voltage Vo of the sensing line 130 is changed. For example, when the alternating voltage (KB) falls from 5V to 0V, the output node voltage Vo of the sensing line 130 also falls, and conversely, when the alternating voltage (KB) The output node voltage Vo of the line 130 also rises.

Assuming that no touch is generated, when the alternating voltage KB supplied to the driving line 120 in the floating state of the sensing line 130 falls to 0 V, the output node voltage Vo of the sensing line 130 is instantaneously .

Assuming that the touch occurs, when the alternating voltage KB applied to the driving line 120 falls to 0 V in the floating state of the sensing line 130, the output node voltage Vo of the sensing line 130 is increased, The lowering width is formed to be smaller than that in the case where no touch occurs.

6, when the alternating voltage KB is applied to the driving line 120 while the sensing line 130 is maintained in the floating state, the voltage of the output node Vo of the sensing line 130 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 130 when the touch is generated or not by the change of the mutual capacitance Cm formed between the sensing line 130 and the driving line 120, This is because the values are different.

6, when the on / off switching of the switch SW and the alternating voltage applied to the driving line 120 are started at the same timing, the voltage change amount DELTA V), the same signal of the inside of the touch detection apparatus (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 110 due to a touch noise generated when a finger or the like is touched. The sensing device can reduce the influence of the touch noise by allowing the mutual capacitance Cm formed by the driving line 120 and the sensing line 130 to replace the touch capacitance Ct. Therefore, the touch sensing apparatus according to the embodiment of the present invention can detect the touch according to the change of the mutual capacitance Cm in place of the touch capacitance Ct.

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 (9)

A touch panel touch-sensing device comprising: a plurality of sensor nodes formed by a plurality of drive lines and a plurality of sensing lines, And an attenuator for attenuating the parasitic capacitance generated in the sensor node,
Wherein the attenuation unit applies the output terminal voltage of the detection subject sensing line including the detection subject sensor node to the other sensor node at the time of detecting whether the detection subject sensor node is touched,
And a touch detection unit for detecting a touch through detection of a voltage change amount of the detection subject sensing line in accordance with an alternating voltage applied to a detection subject driving line including the detection subject sensor node in a state in which the sensing subject sensing line is floated , A touch detection device.
delete The method according to claim 1,
The touch detection unit includes:
A charging unit that charges the sensing target sensing line and floats the sensing target sensing line; And
Further comprising an alternating voltage generation section for applying an alternating voltage to the detection subject drive line.
The method according to claim 1,
Wherein the attenuator comprises a buffer,
Wherein an input terminal of the buffer is connected to an output terminal of the detection object sensing line and an output terminal of the buffer is connected to another driving line and a sensing line except the driving line and the sensing line included in the detection object sensor node, .
A touch detection apparatus of a touch panel including a plurality of sensor nodes formed by a plurality of drive lines and a plurality of sense lines,
And an attenuation unit that attenuates a parasitic capacitance generated in another sensor node adjacent to the detection target sensor node,
Wherein the attenuation unit applies an output terminal voltage of the detection subject sensing line including the detection subject sensor node to a driving line and a sensing line included in the other sensor node at a time of detecting whether the detection subject sensor node is touched,
And a touch detection unit for detecting a touch through detection of a voltage change amount of the detection subject sensing line in accordance with an alternating voltage applied to a detection subject driving line including the detection subject sensor node in a state in which the sensing subject sensing line is floated , A touch detection device.
A touch detection method of a touch panel including a plurality of sensor nodes formed by a plurality of driving lines and a plurality of sensing lines,
A step of attenuating a parasitic capacitance generated in a sensor node other than a detection target sensor node selected to be a touch target among the plurality of sensor nodes; And
Detecting a touch through detection of a voltage change amount of the detection subject sensing line in accordance with an alternating voltage applied to a detection subject driving line including the detection subject sensor node while the detection subject sensing line including the detection subject sensor node is floated , ≪ / RTI >
Wherein the attenuation step applies the output terminal voltage of the detection subject sensing line to the other sensor node.
delete The method according to claim 6,
Wherein the touch detection step comprises:
Charging the detection target sensing line and floating the sensing target sensing line; And
And applying an alternating voltage to the detection subject drive line.
The method according to claim 6,
Wherein the attenuating step comprises a buffer,
Wherein an input terminal of the buffer is connected to an output terminal of the detection object sensing line and an output terminal of the buffer is connected to another driving line and a sensing line excluding a driving line and a sensing line included in the detection target sensor node, Detection method.

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