KR102378319B1 - Touch display device, touch panel, touch driving circuit, and driving method - Google Patents

Abstract

Embodiments of the present invention relate to a touch display device, a touch panel, a touch driving circuit, and a driving method, and more particularly, a touch capable of minimizing the influence of panel noise on touch sensing and display by receiving panel noise feedback. It relates to a display device, a touch panel, a touch driving circuit, and a driving method.

Description

Touch display device, touch panel, touch driving circuit and driving method {TOUCH DISPLAY DEVICE, TOUCH PANEL, TOUCH DRIVING CIRCUIT, AND DRIVING METHOD}

The present invention relates to a touch display device, a touch panel, a touch driving circuit, and a driving method.

As the information society develops, the demand for a touch display device for displaying an image is increasing in various forms, and in recent years, various display devices such as a liquid crystal display device, a plasma display device, and an organic light emitting display device are utilized.

Among these display devices, there is a touch display device that provides a touch-based input method that allows a user to easily and intuitively and conveniently input information or a command by breaking away from a conventional input method such as a button, a keyboard, and a mouse.

In the conventional touch display device, during the touch driving period, the touch electrode, which is the sensing target, is affected by the surrounding electrodes or wires, and thus the touch sensitivity is greatly reduced.

In addition, since the conventional touch display device has to provide both an image display function and a touch sensing function, a driving time such as a frame time is divided into a display driving period and a touch driving period, and display driving is performed in the display driving period. , touch driving and touch sensing are performed in the touch driving period that is performed after the display driving period.

In the case of such a time division driving method, in order to time division display driving and touch driving, very precise timing control is required, and expensive parts may be required for this.

In addition, in the case of the time division driving method, both the display driving time and the touch driving time may be insufficient, and there has been a problem in that image quality and touch sensitivity are both degraded. In particular, due to time division driving, there may be a problem in that high-resolution image quality cannot be provided.

Against this background, it is an object of the embodiments of the present invention to provide a touch display device, a touch panel, a touch driving circuit, and a drive capable of accurate touch sensing without being affected by panel noise during sensing processing for a sensing target touch electrode. to provide a way.

Another object of the embodiments of the present invention is to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of stably performing time-free driving capable of simultaneously performing display and touch sensing. there is

Another object of the embodiments of the present invention is to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of minimizing the influence of a ripple induced by a touch electrode serving as a common electrode on touch sensing and display. is to provide

Another object of the embodiments of the present invention is to provide a touch display device capable of preventing crosstalk between a display and a touch due to ripple induced by a touch electrode serving as a common electrode in an environment in which display driving and touch driving are simultaneously performed. , to provide a touch panel, a touch driving circuit and a driving method.

In one aspect, embodiments of the present invention may provide a touch display device including a touch panel having a plurality of touch electrodes disposed in a touch area, and a touch driving circuit configured to detect a sensing signal by driving the touch panel.

During the first time period, the plurality of touch electrodes may be classified into one or more sensing target touch electrodes selected for the first time period and one or more non-sensing target touch electrodes excluding the one or more sensing target touch electrodes.

During the first time period, the touch driving circuit supplies a driving signal to one or more non-sensing target touch electrodes, supplies a received signal received from the touch panel to the one or more sensing target touch electrodes, and A detection signal can be detected.

As an example of a structure and method for receiving a received signal from a touch panel, the touch panel includes one or more dummy electrodes disposed in an outer region of the touch region, and one or more supplies for supplying signals from the touch driving circuit to the one or more dummy electrodes. A line and one or more feedback lines for transmitting a signal from the one or more dummy electrodes to the touch driving circuit may be disposed.

In this case, during the first time period, when the driving signal is supplied to the one or more non-sensing target touch electrodes, the touch driving circuit supplies the driving signal to the one or more dummy electrodes through one or more supply lines and to the one or more dummy electrodes. The supplied driving signal may be fed back through one or more feedback lines, and the fed back driving signal (received signal received from the touch panel) may be supplied to one or more sensing target touch electrodes.

As another example of the structure and method of receiving a received signal from the touch panel, one or more feedback lines for transmitting a signal from one or more non-sensing target touch electrodes to the touch driving circuit may be disposed on the touch panel.

In this case, during the first time period, the touch driving circuit supplies a driving signal to the one or more non-sensing target touch electrodes, and applies the driving signal supplied to the selected feedback touch electrode among the one or more non-sensing target touch electrodes to the feedback touch electrode. Feedback is received through the connected feedback line, and the feedback driving signal (received signal received from the touch panel) is supplied to one or more sensing target touch electrodes.

In another aspect, embodiments of the present invention provide a touch including a plurality of touch electrodes disposed in a touch region, one or more dummy electrodes disposed in an outer region of the touch region, and one or more feedback lines connected to one or more dummy electrodes. A panel can be provided.

During the first time period, the plurality of touch electrodes may be classified into one or more sensing target touch electrodes selected for the first time period and one or more non-sensing target touch electrodes excluding the one or more sensing target touch electrodes.

During the first time period, a driving signal is supplied to one or more non-sensing target touch electrodes, a driving signal is supplied to one or more dummy electrodes, and a signal corresponding to a signal output from one or more feedback lines is applied to the one or more sensing target touch electrodes. can be supplied as

In another aspect, embodiments of the present invention provide a touch panel including a plurality of touch electrodes disposed in a touch area, a plurality of touch lines connected to the plurality of touch electrodes, and a plurality of feedback lines connected to the plurality of touch electrodes can provide

During the first time period, the plurality of touch electrodes may be classified into one or more sensing target touch electrodes selected for the first time period and one or more non-sensing target touch electrodes excluding the one or more sensing target touch electrodes.

During the first time period, a driving signal is supplied to the one or more non-sensing target touch electrodes, and a signal corresponding to a signal output from a feedback line connected to one of the one or more non-sensing target touch electrodes is supplied to the one or more sensing target touch electrodes can be

In another aspect, embodiments of the present invention provide a first driving unit for supplying a driving signal to one or more non-sensing target touch electrodes excluding one or more sensing target touch electrodes selected from among a plurality of touch electrodes, and a feedback signal from the touch panel It is possible to provide a driving circuit including a second driving unit for receiving and supplying a feedback signal as a driving signal to one or more sensing target touch electrodes.

In another aspect, embodiments of the present invention include the steps of supplying a driving signal to one or more non-sensing target touch electrodes except for one or more sensing target touch electrodes selected from among a plurality of touch electrodes, and receiving a feedback signal from a touch panel. It is possible to provide a driving method comprising the steps of: and supplying a feedback signal as a driving signal to one or more sensing target touch electrodes.

According to the above-described embodiments of the present invention, a touch display device, a touch panel, a touch driving circuit and driving capable of accurately sensing a touch without being affected by panel noise during the sensing process of the sensing target touch electrode. method can be provided.

According to the embodiments of the present invention, it is possible to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of stably performing time-free driving capable of simultaneously performing display and touch sensing. there is.

According to embodiments of the present invention, it is possible to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of minimizing the influence of a ripple induced by a touch electrode serving as a common electrode on touch sensing and display. can

According to the embodiments of the present invention, in an environment in which display driving and touch driving are performed simultaneously, a touch display device capable of preventing crosstalk between a display and a touch due to ripple caused by a touch electrode serving as a common electrode, a touch A panel, a touch driving circuit, and a driving method may be provided.

1 and 2 are system configuration diagrams of a touch display device according to embodiments of the present invention.
3 is a diagram illustrating a display panel having a built-in touch panel in a touch display device according to an embodiment of the present invention.
4 is a time division driving timing diagram of a touch display device according to embodiments of the present invention.
5 is a time-free driving timing diagram of a touch display device according to embodiments of the present invention.
6 is a diagram illustrating a ground environment of a touch display device according to embodiments of the present invention.
7 is a time-free driving timing diagram during ground modulation in a touch display device according to embodiments of the present invention.
8 is a diagram illustrating a touch driving circuit of a touch display device according to embodiments of the present invention.
9 is a diagram illustrating a touch driving operation for one touch electrode column performed by a touch driving circuit of a touch display device according to embodiments of the present invention.
10 is a diagram illustrating a touch driving operation for a touch panel performed by a touch driving circuit of a touch display device according to embodiments of the present invention.
11 is a view for explaining a common voltage ripple phenomenon that occurs during touch driving of a touch display device according to embodiments of the present invention and a touch sensing failure according thereto.
12 is a diagram schematically illustrating a touch driving structure capable of preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.
13 is a diagram illustrating a first touch driving structure for preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.
14 is a diagram illustrating a second touch driving structure for preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.
15 is a block diagram of a touch driving circuit according to embodiments of the present invention.
16 is a flowchart of a driving method according to embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

1 and 2 are system configuration diagrams of a touch display device according to embodiments of the present invention.

A touch display device according to embodiments of the present invention may perform an image display function and a touch sensing function (touch input function).

Hereinafter, configurations for the touch display device according to the embodiments of the present invention to provide an image display function will be described with reference to FIG. 1 , and the touch display device according to the embodiments of the present invention provides a touch sensing function (touch input). function) will be described with reference to FIG. 2 .

Referring to FIG. 1 , a touch display device according to embodiments of the present invention may include a display panel DISP and driving circuits for driving the display panel DISP to provide an image display function.

A plurality of data lines DL and a plurality of gate lines GL are disposed in the display panel DISP, and a plurality of data lines DL and a plurality of gate lines GL defined by the plurality of data lines DL and GL are disposed. The subpixels SP of are arranged.

The driving circuits for driving the display panel DISP include a data driving circuit DDC driving the plurality of data lines DL, a gate driving circuit GDC driving the plurality of gate lines GL, , and a display controller (D-CTR) for controlling the data driving circuit (DDC) and the gate driving circuit (GDC).

Pixel electrodes in each sub-pixel SP may be disposed on the display panel DISP.

A pixel voltage may be applied to the pixel electrode of each sub-pixel SP.

Also, one or two or more common electrodes to which a common voltage is applied may be disposed on the display panel DISP.

One common electrode is a single tubular electrode formed on the front surface of the display panel DISP.

Two or more common electrodes can be regarded as an electrode obtained by dividing one canister electrode into two or more. Each of the two or more common electrodes may have a size larger than the size of one sub-pixel area.

In each sub-pixel SP, a corresponding electric field may be formed by the pixel voltage (which may be a data voltage) applied to the corresponding pixel electrode and the common voltage applied to the common electrode.

The display controller (D-CTR) supplies various driving control signals (DCS, GCS) to the data driving circuit (DDC) and the gate driving circuit (GDC) to control the data driving circuit (DDC) and the gate driving circuit (GDC) control

The display controller (D-CTR) starts scanning according to the timing implemented in each frame, and converts the input image data input from the outside to match the data signal format used by the data driving circuit (DDC) to convert the converted image data (DATA) is output, and data operation is controlled at an appropriate time according to the scan.

The display controller D-CTR may include a timing controller used in the field of display technology, and may be a control device further including other control functions or modules.

The display controller D-CTR may be implemented as a separate component from the data driving circuit DDC, or may be integrated with the data driving circuit DDC and implemented as an integrated circuit.

The data driving circuit DDC receives image data DATA from the display controller D-CTR and supplies a data voltage to the plurality of data lines DL to drive the plurality of data lines DL. .

The data driving circuit DDC may be implemented by including at least one source driver integrated circuit.

Each source driver integrated circuit is connected to a bonding pad of the display panel DISP by a tape automated bonding (TAB) method or a chip on glass (COG) method, or the display panel It may be directly disposed on the DISP or, in some cases, may be integrated and disposed on the display panel DISP. In addition, each source driver integrated circuit SDIC may be implemented in a chip on film (COF) method mounted on a film connected to the display panel DISP.

The gate driving circuit GDC sequentially drives the plurality of gate lines GL by sequentially supplying a scan signal to the plurality of gate lines GL.

The gate driving circuit GDC may be implemented by including at least one gate driver integrated circuit.

Each gate driver integrated circuit is connected to a bonding pad of the display panel DISP by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or is implemented as a GIP (Gate In Panel) type. It may be directly disposed on the display panel DISP or, in some cases, may be integrated and disposed on the display panel DISP. In addition, each gate driver integrated circuit GDIC may be implemented in a chip-on-film (COF) method mounted on a film connected to the display panel DISP.

The gate driving circuit GDC sequentially transmits a scan signal (gate signal) of an on voltage or an off voltage to the plurality of gate lines GL under the control of the display controller D-CTR. supply

The data driving circuit DDC converts the image data DATA received from the display controller D-CTR into an analog data voltage when a specific gate line is opened by the gate driving circuit GDC to convert a plurality of data lines Supplied by DL.

The data driving circuit DDC may be located only on one side (eg, upper or lower side) of the display panel DISP, and in some cases, both sides of the display panel DISP (eg : It may be located on both the upper and lower sides).

The gate driving circuit GDC may be located only on one side (eg, left or right) of the display panel DISP, and in some cases, both sides (eg, left or right) of the display panel DISP according to a driving method, a panel design method, etc. For example, it can be located on both the left and right side).

Referring to FIG. 2 , in the touch display device according to the embodiments, in order to provide a touch sensing function, a touch panel TSP and a touch circuit for detecting the presence or absence of a touch or touch coordinates by detecting the touch panel TSP (TC) may be included.

The touch circuit TC may include a touch driving circuit TDC and a touch controller T-CTR.

The touch driving circuit TDC and the touch controller T-CTR may be implemented separately or may be integrated and implemented as one.

In the touch panel TSP, a plurality of touch electrodes TE are disposed in a touch area (which may correspond to a display area), and a plurality of touch lines TL electrically connected to the plurality of touch electrodes TE are disposed can be

Each touch electrode TE may be an electrode without an opening.

Alternatively, each touch electrode TE may be a mesh-type electrode having a plurality of openings, or a comb-shaped electrode.

Each touch electrode TE may be electrically connected to one or more touch lines TL through one or more contact holes.

The plurality of touch lines TL electrically connect the plurality of touch electrodes TE to the touch driving circuit TDC.

The touch driving circuit TDC may generate and output sensing data by driving the touch panel TSP.

For example, the touch driving circuit TDC supplies a driving signal to all or a part of the plurality of touch electrodes TE disposed on the touch panel TSP, and detects a sensing signal from at least one touch electrode TE. Detection data can be generated and output.

The touch driving circuit TDC may supply a driving signal (touch driving signal) to one or more touch electrodes TE through one or more touch lines TL and detect a sensing signal (touch sensing signal).

The touch controller T-CTR may acquire touch presence and/or touch coordinates by using the sensed data output from the touch driving circuit TDC.

The touch display device may detect a touch based on mutual-capacitance or may detect a touch based on self-capacitance.

When a touch is sensed based on mutual-capacitance, the plurality of touch electrodes TE disposed on the touch panel TSP may be disposed in a matrix form. In this case, each touch electrode TE may have a bar shape.

Alternatively, when sensing a touch based on mutual-capacitance, the plurality of touch electrodes TE disposed on the touch panel TSP may form row-direction touch electrode lines and column-direction touch electrode lines. In this case, each touch electrode TE may have a diamond shape, a rectangular shape, or a square shape.

The touch driving circuit TDC supplies a driving signal to the touch electrode TE or touch electrode lines in the row direction (or column direction), and the touch electrode TE or the touch electrode line in the column direction (or row direction). The sensor receives a detection signal, generates detection data based on the received detection signal, and supplies it to the touch controller (T-CTR). The touch controller T-CTR detects the presence or absence of a touch or touch coordinates based on the sensed data.

When sensing a touch based on self-capacitance, the touch electrodes TE on the touch panel TSP may be electrically separated from each other.

The touch driving circuit TDC supplies a driving signal to all or part of the plurality of touch electrodes TE, receives a sensing signal from the touch electrode TE to which the driving signal is supplied, and detects data based on the received sensing signal. generated and supplied to the touch controller (T-CTR). The touch controller T-CTR detects the presence or absence of a touch or touch coordinates based on the sensed data.

As described above, the touch display device according to embodiments of the present invention may sense a touch based on self-capacitance or may sense a touch based on mutual-capacitance. However, hereinafter, for convenience of description, sensing of a touch based on self-capacitance will be described as an example.

The touch panel TSP may be manufactured separately from the display panel DISP and bonded to the display panel DISP. That is, the touch panel TSP may be external to the display panel DISP.

Alternatively, the touch panel TSP may be embedded in the display panel DISP. In this case, the plurality of touch electrodes TE and the plurality of touch lines TL are embedded in the display panel DISP. That is, in the process step of manufacturing the display panel DISP, a plurality of touch electrodes TE and a plurality of touch lines TL may be formed.

The touch driving circuit TDC and the data driving circuit DDC may be integrated and implemented.

3 is a diagram illustrating a display panel DISP having a built-in touch panel TSP in the touch display device according to embodiments of the present invention.

When the touch panel TSP is embedded in the display panel DISP, the plurality of touch electrodes TE disposed in the touch area of the display panel DISP may be a common electrode used when driving the display. In this case, as an example, the display panel DISP may be of various types such as a liquid crystal display panel and an organic light emitting display panel.

Accordingly, a common voltage may be applied to the plurality of touch electrodes TE for image display, and a driving signal may be applied to all or part of the plurality of touch electrodes TE for touch sensing.

Meanwhile, the display panel DISP may be an organic light emitting display panel. In this case, the plurality of touch electrodes TE and the plurality of touch lines TL are disposed on the entire surface of the display panel DISP and may be positioned on an encapsulation layer disposed on the common electrode to which a common voltage is applied. can

Here, the common electrode disposed on the front surface of the display panel DISP, which is an organic light emitting display panel, is, for example, an anode electrode (corresponding to a pixel electrode) of an organic light emitting diode (OLED) in each subpixel SP. ) and the cathode electrode may be the cathode electrode, and the common voltage may be the cathode voltage.

In this case, each of the plurality of touch electrodes TE may be in the form of an electrode having no opening. In this case, each of the plurality of touch electrodes TE may be a transparent electrode for light emission from the sub-pixels SP.

Alternatively, each of the plurality of touch electrodes TE may be a mesh-type electrode having a plurality of openings. In this case, each opening in each of the plurality of touch electrodes TE may correspond to a light emitting area (eg, a region in which a part of the anode electrode is located) of the subpixel SP.

Meanwhile, in relation to the size of the touch electrode, an area of each of the plurality of touch electrodes TE may overlap an area of two or more sub-pixels SP.

That is, the area size of one touch electrode TE may correspond to the area size of two or more sub-pixels SP.

One touch electrode TE may overlap two or more gate lines GL.

One touch electrode TE and two or more gate lines GL are insulated from each other.

One touch electrode TE may overlap two or more data lines DL.

One touch electrode TE and two or more data lines DL are insulated from each other.

2 and 3 , the plurality of touch lines TL are insulated from each other in the touch panel TSP.

2 and 3 , the plurality of touch lines TL may be arranged in the same direction as the plurality of data lines DL.

In this case, the data lines DL parallel to the touch line TL affect the touch electrode TE disposed in the same direction. That is, the voltage state of the data lines DL parallel to the touch line TL affects the voltage state of the touch electrode TE disposed in the same direction.

Alternatively, the plurality of touch lines TL may be arranged in the same direction as the plurality of gate lines GL.

In this case, the gate lines GL parallel to the touch line TL affect the touch electrode TE disposed in the same direction. That is, the voltage state of the gate lines GL parallel to the touch line TL affects the voltage state of the touch electrode TE disposed in the same direction.

4 is a time division driving timing diagram of a touch display device according to embodiments of the present invention.

Referring to FIG. 4 , the touch display device according to embodiments of the present invention may perform display driving and touch driving at different time zones.

That is, the touch display device according to embodiments of the present invention may perform display driving and touch driving by time division. This driving method is called a time division driving method.

The touch display device according to embodiments of the present invention may use the synchronization signal TSYNC to distinguish the display driving period from the touch driving period.

For example, in the synchronization signal TSYNC, a first level (eg, a high level or a low level) may indicate a display driving period, and a second level (eg, a low level or a high level) may indicate a touch driving period. .

During the touch driving period, all or part of the plurality of touch electrodes TE receive the driving signal TDS.

During the display driving period, the plurality of touch electrodes TE may be floated, grounded to the ground, or a specific DC voltage may be applied.

If the touch electrode TE also serves as a common electrode for driving the display, the touch electrode TE receives the common voltage Vcom for driving the display during the display driving period and receives the driving signal ( TDS) can be obtained.

The driving signal TDS applied to the touch electrode TE during the touch driving period may be a DC voltage or a signal whose voltage level is changed. When the driving signal TDS is a signal whose voltage level is changed, the driving signal TDS may also be referred to as a modulation signal, a pulse signal, or an AC signal.

Meanwhile, during the touch driving period, while the driving signal TDS is applied to the touch electrode TE, which may be a common electrode, the touch electrode TE may form parasitic capacitance with other surrounding electrodes. Such parasitic capacitance may degrade touch sensitivity.

Accordingly, in the touch display device, while the driving signal TDS is applied to the touch electrode TE, which may be a common electrode, during the touch driving period, the load-free driving signal LFD is applied to other electrodes around the touch electrode TE. ) can be approved.

The load-free driving signal LFD may be a driving signal TDS or a signal corresponding to at least one of a frequency, a phase, a voltage polarity, and an amplitude of the driving signal TDS.

Other electrodes surrounding the touch electrode TE may be data lines, gate lines, or other touch electrodes, and may also be all electrodes or signal wires in the vicinity of the touch electrode TE.

During the touch driving period, while the driving signal TDS is applied to the touch electrode TE, one or more data lines positioned around the touch electrode TE or load-free driving to all data lines in the display panel DIPS A signal LFD_DATA may be applied.

During the touch driving period, while the driving signal TDS is applied to the touch electrode TE, one or more gate lines positioned around the touch electrode TE or load-free driving to all gate lines in the display panel DIPS A signal LFD_GATE may be applied.

During the touch driving period, while the driving signal TDS is applied to the touch electrode TE, one or more touch electrodes TE positioned around the touch electrode TE or all other touch electrodes ( TE), the load-free driving signal LFD_Vcom may be applied.

When the touch display device according to the embodiments of the present invention is driven by the time division driving method, since the frame time must be divided into the display driving period and the touch driving period to be used, the display driving time may be insufficient.

This lack of driving time for the display may cause a situation in which a capacitor for displaying an image (eg, a capacitor between a pixel electrode and a common electrode, etc.) cannot be charged as much as necessary.

When the touch display device according to the embodiments of the present invention is driven by the time division driving method, not only the display driving time is insufficient, but also the touch driving time is insufficient, and thus the touch sensing speed and accuracy may be deteriorated.

In addition, when the touch display device according to the embodiments of the present invention is driven by the time division driving method, a power integrated circuit for generating the driving signal TDS and the load-free driving signal LFD is separately required. there is.

Accordingly, the touch display device according to embodiments of the present invention may simultaneously perform display driving and touch driving in a driving method different from the time division driving method.

In order for the touch display device according to the embodiments of the present invention to simultaneously perform display driving and touch driving, a driving operation must be performed so that there is no adverse interaction between the display driving and the touch driving. A time-free driving method for this will be described in detail below.

5 is a time-free driving timing diagram of a touch display device according to embodiments of the present invention.

Referring to FIG. 5 , the touch display device according to embodiments of the present invention may simultaneously perform display driving and touch driving. Such a driving method is called a Time Free Driving (TFD) method.

Accordingly, the touch display device according to embodiments of the present invention may not require a synchronization signal TSYNC for distinguishing the display driving period from the touch driving period.

When the touch display device according to the embodiments of the present invention performs time-free driving, display driving and touch driving may be performed during an active time among an active time and a blank time defined by the vertical synchronization signal Vsync. . Here, one active time may correspond to one display frame time.

Accordingly, when the touch display device according to the embodiments of the present invention performs time-free driving, during the active time defined by the vertical synchronization signal Vsync, the plurality of gate lines GL are connected to drive the display. While sequentially driving, a data voltage for image display may be supplied to the data lines DL, and at the same time, a driving signal TDS may be supplied to the plurality of touch electrodes TE for touch driving.

Accordingly, the touch display device according to the embodiments of the present invention may sense a touch by a finger and/or a pen while displaying an image through display driving by performing a driving operation in a time-free driving method.

Meanwhile, the touch display device according to embodiments of the present invention may simultaneously perform display driving and touch driving in all frame times (ie, all active times).

On the other hand, in the touch display device according to the embodiments of the present invention, only display driving is performed in some frame times (active time), and display driving and touch driving can be simultaneously performed in some other frame times (active time), , in some cases, only touch driving may be performed in some frame time (active time).

Meanwhile, in the touch display device according to the embodiments of the present invention, a driving signal TDS having a variable voltage level during an active time is supplied to the touch electrode TE, and a driving signal TDS having a variable voltage level even during a blank time is supplied to the touch electrode TE. TDS) can be supplied to the touch electrode TE (Case 1).

Alternatively, the touch display device according to the embodiments of the present invention may float the touch electrode TE, supply a DC voltage, or supply a specific reference voltage (eg, a ground voltage) during the blank time (Case 2). ). This may be applied when the blank time is used as a special time for pen touch driving.

As described above, when the touch display device performs display driving and touch driving simultaneously in a time-free driving method, it is possible to prevent a situation in which display driving time is insufficient due to touch driving. Accordingly, it is possible to realize a high resolution while performing touch sensing.

FIG. 6 is a diagram illustrating a ground environment of a touch display device according to embodiments of the present invention, and FIG. 7 is a time-free driving timing diagram during ground modulation in a touch display device according to embodiments of the present invention.

Referring to FIG. 6 , the touch display device according to embodiments of the present invention has two types of ground GND1 and GND2.

The touch controller T-CTR, the display controller D-CTR, and the like may be grounded to the primary ground GND1 among the two grounds GND1 and GND2.

The display panel DISP and the like may be grounded to the secondary ground GND2 among the two grounds GND1 and GND2.

The touch driving circuit TDC that exchanges signals between the touch controller T-CTR grounded to the primary ground GND1 and the display panel DISP grounded to the secondary ground GND2 is the primary ground GND1 and the secondary ground GND2.

The data driving circuit (DDC) that exchanges signals between the display controller (D-CTR) grounded to the primary ground (GND1) and the display panel (DISP) grounded to the secondary ground (GND2) is the primary ground (GND1) and the secondary ground GND2.

Meanwhile, the primary ground GND1 may be a ground wire or a ground electrode disposed on the display panel DISP, an external structure such as an outer cover of the display panel DISP, or a wire or electrode disposed on the external structure. . In addition, the secondary ground GND2 may be a ground wire or a ground electrode disposed on the display panel DISP, an external structure such as an outer cover of the display panel DISP, or a wire or electrode disposed on the external structure. .

Referring to FIG. 6 , the touch display device according to embodiments of the present invention may further include a ground modulation circuit (GMC) for performing ground modulation.

In the ground modulation circuit GMC, one of the primary ground voltage Vgnd1 of the primary ground GND1 and the secondary ground voltage Vgnd2 of the secondary ground GND2 is modulated with respect to the other ground voltage. Modulation processing can be performed so that it becomes this.

Referring to FIG. 6 , the secondary ground voltage Vgnd2 of the secondary ground GND2 can be viewed as a modulated ground voltage with respect to the primary ground voltage Vgnd1 of the primary ground GND1.

Also, the primary ground voltage Vgnd1 of the primary ground GND1 may be regarded as a ground voltage modulated with respect to the secondary ground voltage Vgnd2 of the secondary ground GND2.

That is, looking at the secondary ground voltage Vgnd2 based on the primary ground voltage Vgnd1, the secondary ground voltage Vgnd2 is seen as a modulated signal (modulated ground voltage) whose voltage level is variable. Looking at the primary ground voltage Vgnd1 based on the secondary ground voltage Vgnd2, the primary ground voltage Vgnd1 appears to be a modulated signal (modulated ground voltage) whose voltage level is variable.

The driving signal TDS applied to the touch electrodes TE in the display panel DISP by grounding the display panel DISP to the secondary ground GND2 having the secondary ground voltage Vgnd2 in the form of a modulated signal to swing like the secondary ground voltage (Vgnd2).

As described above, the touch display device can stably drive the display and drive the touch at the same time in a time-free driving method using the two grounds GND1 and GND2.

When the touch display device performs display driving and touch driving simultaneously in a time-free driving method, data is transmitted to the plurality of data lines DL while the driving signal TDS is applied to one or more of the plurality of touch electrodes TE. A voltage may be applied.

In this case, the driving signal TDS applied to one or more of the plurality of touch electrodes TE is the secondary ground voltage Vgnd2 of the secondary ground GND2 to which the display panel DISP is grounded, the frequency, the phase, One or more of signal characteristics such as voltage polarity and amplitude may correspond.

On the other hand, when the plurality of touch electrodes TE are divided common electrodes to which a common voltage used to drive a display is applied, the driving signal TDS applied to one or more of the plurality of touch electrodes TE is necessary for driving the display. It may be a common voltage (Vcom).

When the touch display device according to the embodiments of the present invention simultaneously performs display driving and touch driving according to a time-free driving method and the plurality of touch electrodes TE also serve as common electrodes, below, the driving signal TDS ) and the common voltage Vcom may be regarded as the same.

Referring to FIG. 7 , in the touch display device according to the embodiments of the present invention, during the display driving period (ie, during the active time), a driving signal TDS having a variable voltage level is applied to a plurality of touch electrodes TE. is supplied

The driving signal TDS supplied to the plurality of touch electrodes TE is a touch driving signal for driving a touch and also a common voltage Vcom forming a capacitance with each pixel voltage (data voltage) for image display.

Referring to FIG. 7 , the driving signal TDS applied to the plurality of touch electrodes TE disposed on the display panel DISP is a secondary ground voltage of the secondary ground GND2 to which the display panel DISP is grounded. (Vgnd2) may correspond to one or more of frequency, phase, voltage polarity, and amplitude.

Referring to the example of FIG. 7 , while the display driving and the touch driving are simultaneously performed (ie, during the active time), the secondary ground voltage Vgnd2 of the secondary ground GND2 to which the display panel DISP is grounded is ΔV The voltage level can vary between V0 and V0+ΔV with an amplitude of . The driving signal TDS applied to the touch electrode TE may have an amplitude of ΔV and a voltage level may vary between V1 and V1+ΔV.

As in the example of FIG. 7 , the secondary ground voltage Vgnd2 of the secondary ground GND2 to which the display panel DISP is grounded and the driving signal TDS applied to the touch electrode TE are, in frequency, phase, At least one of amplitude and signal polarity may be the same.

However, when the voltage level is changed, the high level voltage and the low level voltage may be the same (V0=V1) or different from each other (V0≠V1).

As shown in FIG. 7 , the vertical synchronization signal Vsync maintains a second level (eg, a high level or a low level) during the active time, and maintains a first level (eg, a low level or a high level) during the blank time. can keep In this case, between the first levels (eg, low level or high level) may be defined as one display frame.

Alternatively, the vertical synchronization signal Vsync may maintain a first level (eg, a low level or a high level) during the active time and maintain a second level (eg, a high level or a low level) during the blank time. In this case, between two pulses having a second level (eg, a high level or a low level) may be defined as one display frame.

8 is a diagram illustrating a touch driving circuit of a touch display device according to embodiments of the present invention, and FIG. 9 is a single touch performed by a touch driving circuit (TDC) of a touch display device according to embodiments of the present invention. It is a diagram showing a touch driving operation for an electrode column.

Referring to FIG. 8 , the touch driving circuit TDC according to embodiments of the present invention includes a first multiplexer circuit MUX1 , a sensing unit block SUB including a plurality of sensing units SU, and a second multiplexer It may include a circuit MUX2, an analog-to-digital converter (ADC), and the like.

The first multiplexer circuit MUX1 may include one or two or more multiplexers. The second multiplexer circuit MUX2 may include one or two or more multiplexers.

Referring to FIG. 8 , each sensing unit SU may include a pre-amplifier (Pre-AMP), an integrator (INTG), and a sample and hold circuit (SHA).

One pre-amplifier (Pre-AMP) may be electrically connected to one or two or more touch electrodes (TE).

For example, as shown in FIG. 9 , one pre-amplifier (Pre-AMP) includes a plurality of touch electrodes TE1, TE2, TE3, TE4, TE5 included in one TE column (TEC). , ......) can be electrically connected to.

Referring to FIG. 9 , one pre-amplifier (Pre-AMP) is selected as a sensing target while rotating among one or more connectable touch electrodes (TE1, TE2, TE3, TE4, TE5, ......) The driving signal TDS may be supplied to one sensing target touch electrode (eg, TE1), and the sensing signal may be received from the sensing target touch electrode (eg, TE1) to which the driving signal TDS is applied.

Referring to FIG. 9 , the multiplexer MUX included in the first multiplexer circuit MUX1 includes a plurality of touch electrodes TE1, TE2, TE3, TE4, TE5 included in the touch electrode column TEC. , ...... ), which is a touch electrode selected as a sensing target, is connected to the sensing target touch electrode TE1 with the pre-amplifier (Pre-AMP).

That is, the multiplexer MUX connects the node b connected to the pre-AMP to the node a1 connected to the selected sensing target touch electrode TE1.

Accordingly, the pre-amplifier (Pre-AMP) receives the common voltage (Vcom) corresponding to the driving signal (TDS) output from the power management integrated circuit (PMIC) through the first input terminal (I1) and receives the second input terminal ( output as I2).

The common voltage Vcom output from the second input terminal I2 of the Pre-AMP is supplied to the sensing target touch electrode TE1 selected by the multiplexer MUX.

The multiplexer MUX is a plurality of touch electrodes TE1, TE2, TE3, TE4, TE5, ...... The nodes (a2, a3, a4, a5, ...... ) connected to the non-sensing target touch electrodes (TE2, TE3, TE4, TE5, ...... ) are connected to the power management integrated circuit (PMIC). It connects in common to node c that is directly connected to

Accordingly, the non-sensing target touch electrodes TE2, TE3, TE4, TE5, ...... ) can directly receive the common voltage (Vcom) without going through the pre-amplifier (Pre-AMP).

Thereafter, the pre-amplifier may receive a sensing signal from the sensing target touch electrode TE1. The feedback capacitor Cfb is charged by the sensing signal thus received, and accordingly, the signal output to the output terminal O of the pre-amplifier may be input to the integrator INTG.

The pre-amplifier (Pre-AMP) and the integrator (INTG) may be implemented integrally.

The integrator (INTG) integrates the signal output from the pre-amplifier (Pre-AMP).

The analog-to-digital converter ADC may output touch sensing data obtained by converting the integral value output to the integrator INTG into a digital value to the touch controller T-CTR.

The analog-to-digital converter ADC may output sensing data to the touch controller T-CTR grounded to the primary ground GND1.

The pre-amplifier may receive a sensing signal from the touch electrode TE disposed on the display panel DISP grounded to the secondary ground GND2 that is a different ground from the primary ground GND1. When such a touch driving circuit TDC is used, a touch sensing signal is received from the touch electrode TE disposed on the display panel DISP grounded to the secondary ground GND2, which is the ground, and the touch sensing signal is received to the primary ground GND1. By outputting touch detection data to the grounded touch controller (D-CTR), it is possible to enable touch detection in a touch display device having two types of ground (GND1, GND2).

Meanwhile, referring to FIG. 8 , the touch driving circuit TDC according to embodiments of the present invention may further include a signal transmission circuit STC for transmitting a signal with the touch controller T-CTR. In this case, the signal transfer circuit STC included in the touch driving circuit TDC according to embodiments of the present invention may be grounded to both the primary ground GND1 and the secondary ground GND2.

10 is a diagram illustrating a touch driving operation for a touch panel TSP performed by a touch driving circuit TDC of a touch display device according to embodiments of the present invention, and FIG. 11 is a diagram illustrating a touch driving operation according to embodiments of the present invention. A diagram for explaining a common voltage ripple (Vcom ripple) phenomenon that occurs as a noise component of a common voltage (Vcom) during touch driving of a touch display device and a touch sensing failure resulting therefrom.

As shown in FIG. 10 , for convenience of explanation, nine touch electrodes TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE It is assumed that 3-1, TE 3-2, TE 3-3) are arranged in the touch area and arranged in 3 rows and 3 columns.

9 touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) One or more touch lines TL are connected to each.

The first touch electrode column TEC #1 includes three touch electrodes TE 1-1, TE 1-2, TE 1-3, and the second touch electrode column TEC #2 includes three touch electrodes. (TE 2-1, TE 2-2, TE 2-3), and the third touch electrode column (TEC #3) has three touch electrodes (TE 3-1, TE 3-2, TE 3-3). ) is included.

The touch line direction and the touch electrode column direction correspond to the data line direction.

Meanwhile, there may be three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) corresponding to the three touch electrode columns (TEC #1, TEC #2, TEC #3). .

When driven in the time-free driving method, the touch driving circuit TDC includes nine touch electrodes TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2- 3, TE 3-1, TE 3-2, TE 3-3) supply the common voltage Vcom to all of the nine touch electrodes TE 1-1 and TE 1- by the first multiplexer circuit MUX1 2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) detects the detection signal from the sequentially selected sensing target touch electrode do.

In the example of FIG. 10 , the touch electrodes TE 1-1, TE 2-1, TE 3-1 positioned in the first row in each of the three touch electrode columns TEC #1, TEC #2, and TEC #3 ) is a touch electrode selected as a "sensing target touch electrode" by the first multiplexer circuit MUX1.

Touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2) located in the second and third rows in each of the three touch electrode columns (TEC #1, TEC #2, TEC #3) -3, TE 3-2, TE 3-3) are touch electrodes selected as "non-sensing target touch electrodes" by the first multiplexer circuit MUX1.

The touch driving circuit TDC receives the common voltage Vcom output from the power management integrated circuit PMIC through the common voltage buffer BUF.

The touch driving circuit TDC transfers the common voltage Vcom output from the common voltage buffer BUF to the six non-sensing target touch electrodes TE 1-2, TE 1-3, TE through the six amplifiers AMP. 2-2, TE 2-3, TE 3-2, TE 3-3) can be supplied.

The touch driving circuit (TDC) has three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #) corresponding to the three touch electrode columns (TEC #1, TEC #2, TEC #3). The common voltage Vcom is supplied to the first input terminal I1 of 3).

Accordingly, the first of the three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) corresponding to the three touch electrode columns (TEC #1, TEC #2, TEC #3) The common voltage Vcom input to the input terminal I1 is output to the second input terminal I2 of the three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3).

The common voltage (Vcom) output to the second input terminal (I2) of the three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) is , TE 2-1, TE 3-1).

Thereafter, the touch driving circuit TDC receives a common voltage Vcom through the second input terminal I2 of the three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3). The sensing signal is received from the three sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1. Thereafter, the signals output from the output terminals O of the three preamplifiers (Pre-AMP #1, Pre-AMP #2, and Pre-AMP #3) are input to the three integrators INTG.

As such, in each of the three touch electrode columns (TEC #1, TEC #2, TEC #3), the touch electrodes (TE 1-1, TE 2-1, TE 3-1) positioned in the first row are “detected” When the sensing of "target touch electrode" is completed, thereafter, the touch driving circuit TDC performs each of the three touch electrode columns TEC #1, TEC #2, and TEC #3 through the first multiplexer circuit MUX1. Select the touch electrodes (TE 1-2, TE 2-2, TE 3-2) located in the second row as the "sensing target touch electrode", and the touch electrodes (TE 1) located in the first and third rows -1, TE 1-3, TE 2-1, TE 2-3, TE 3-1, TE 3-3) select “non-sensing target touch electrode” and repeat the above-mentioned touch driving operation in the same way .

In this way, in each of the three touch electrode columns (TEC #1, TEC #2, TEC #3), the touch electrodes (TE 1-2, TE 2-2, TE 3-2) located in the second row are "detected" When the sensing of "target touch electrode" is completed, thereafter, the touch driving circuit TDC performs each of the three touch electrode columns TEC #1, TEC #2, and TEC #3 through the first multiplexer circuit MUX1. Select the touch electrodes (TE 1-3, TE 2-3, TE 3-3) located in the 3rd row as the "sensing target touch electrode", and the touch electrodes (TE 1) located in the 1st and 2nd rows -1, TE 1-2, TE 2-1, TE 2-2, TE 3-1, TE 3-2) select “non-sensing target touch electrode” and repeat the above-mentioned touch driving operation in the same way .

In this way, in each of the three touch electrode columns (TEC #1, TEC #2, TEC #3), the touch electrodes (TE 1-3, TE 2-3, TE 3-3) located in the third row are "detected" When the sensing with the "target touch electrode" is completed, the sensing of the entire area of the display panel DISP in which the touch panel TSP is embedded is completed.

Accordingly, the touch controller T-CTR may calculate the presence or absence of a touch in the entire area of the display panel DISP or the touch coordinates based on the touch sensing data generated and output by the touch driving circuit TDC. .

As described above with reference to FIG. 10, during the touch driving operation, the common voltage Vcom is simultaneously applied to the sensing target touch electrode (Sensing Target TE) and the non-sensing target touch electrode (Non-sensing target TE). .

The common voltage Vcom applied to the sensing target touch electrode is a driving signal for touch sensing. The common voltage Vcom applied to the non-sensing target touch electrode may be a load free driving signal for preventing unnecessary parasitic capacitance from being formed between the sensing target touch electrode and the non-sensing target touch electrode.

In addition, in the case of the time-free driving method, the common voltage Vcom applied to all touch electrodes TE including the sensing target touch electrode and the non-sensing target touch electrode is applied to the pixel electrode in each sub-pixel for image display. It is also the voltage that forms the pixel voltage and capacitance.

Meanwhile, referring to FIGS. 10 and 11 , when display driving and touch driving are simultaneously performed in a time-free driving method, if the common voltage Vcom is not stable and fluctuates, touch sensitivity and display quality are greatly reduced can

For example, according to the arrangement structure and driving method of the touch electrodes TE, the touch lines TL, and the data lines DL, the touch may be caused by a change in the data voltage applied to the data line DL. A change in the common voltage Vcom applied to the electrodes TE may occur.

When this variation of the common voltage Vcom occurs, a ripple (hereinafter, referred to as a common voltage ripple Vcom Ripple) may be generated as a noise component in the signal waveform of the common voltage Vcom.

The common voltage Vcom applied to the plurality of touch electrodes TE according to the time-free driving method is a modulation signal whose voltage level is changed, but the signal waveforms shown in FIGS. 10 and 11 are, for convenience of explanation, DC It shows that the common voltage ripple Vcom ripple occurs in the positive direction and the negative direction at the common voltage Vcom of the voltage.

As illustrated in FIG. 11 , when the common voltage ripple Vcom Ripple is generated, an undesired change may occur in the sensed data (touch sensed data), which may result in a touch sense failure.

In addition, the generation of the common voltage ripple Vcom ripple may affect display operation as well as touch sensing failure, thereby causing display-related defects such as crosstalk.

Accordingly, in the touch display device according to the embodiments of the present invention, when the touch electrode TE serving as a common electrode is driven in a time-free driving method, a common voltage ripple that may be generated in the touch electrode TE Degradation of touch sensitivity and display quality can be prevented.

Below, a touch driving method and a touch driving structure capable of preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention are shown in FIGS. It will be described with reference to FIG. 16 .

12 is a diagram schematically illustrating a touch driving structure capable of preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.

Referring to FIG. 12 , in the touch display device according to the embodiments of the present invention, a touch panel TSP having a plurality of touch electrodes TE disposed in a touch area, and driving the touch panel TSP to receive a sensing signal It may include a touch driving circuit (TDC) for detecting.

Here, the touch panel TSP may be embedded in the display panel DISP.

During the first time period, the plurality of touch electrodes TE include one or more sensing target touch electrodes selected for the first time period and one or more sensing target touch electrodes excluding one or more sensing target touch electrodes TE. It may be classified as a non-sensing target touch electrode (Non-sensing Target TE).

Here, the first time period may be a touch driving period in which touch driving for touch sensing is performed.

The first time period may be a period in which display driving is performed according to a driving method.

When driving in the time division driving method, the first time period may be a touch driving period in which display driving is not performed.

In the case of driving in the time-free driving method, the first time period may be a touch driving period that proceeds along with driving the display. In this case, an image may be displayed on the display panel DISP during the first time period.

A touch driving circuit (TDC) of a touch display device according to embodiments of the present invention provides a method and structure for supplying a driving signal to a non-sensing target TE, and a sensing target touch electrode (Sensing Target TE). ), the method and structure of supplying the driving signal are different from each other.

During the first time period, the touch driving circuit TDC supplies the driving signal TDS to one or more non-sensing target touch electrodes TE. Here, in the case of the time-free driving method, the driving signal TDS corresponds to the common voltage Vcom. Therefore, below, the driving signal TDS is used the same as the common voltage Vcom.

During the first time period, the touch driving circuit TDC supplies the received signal FB Vcom received from the touch panel TSP as a driving signal to one or more sensing target touch electrodes TE.

The touch driving circuit TDC may detect a sensing signal from one or more sensing target touch electrodes TE to which the received signal FB Vcom received from the touch panel TSP is applied.

Referring to FIG. 12 , the received signal FB Vcom received by the touch driving circuit TDC from the touch panel TSP is input to the first input terminal I1 of the pre-amplifier, and the second input terminal I2 ) is applied to the sensing target touch electrode Sensing Target TE in the touch panel TSP.

When a ripple exists in the received signal FB Vcom received from the touch panel TSP, the same ripple may also exist in the signal FB Vcom applied to the sensing target touch electrode Sensing Target TE.

Using the above-described touch driving structure, a touch driving circuit (TDC), which is a signal detection circuit for touch sensing by receiving a reception signal (FB Vcom) having a common voltage ripple from the touch panel (TSP) and applying it to a sensing target touch electrode Also, even if a common voltage ripple occurs during time-free driving, the touch driving circuit TDC shakes with the same phase and magnitude, thereby minimizing the influence of the common voltage ripple.

Hereinafter, two touch driving structures capable of reducing the influence of the common voltage ripple will be described with reference to FIGS. 13 and 14 .

13 is a diagram illustrating a first touch driving structure for preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.

13 , for convenience of explanation, nine touch electrodes TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE It is assumed that 3-1, TE 3-2, TE 3-3) are arranged in the touch area and arranged in 3 rows and 3 columns.

9 touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) One or more touch lines TL are connected to each.

The first touch electrode column TEC #1 includes three touch electrodes TE 1-1, TE 1-2, TE 1-3, and the second touch electrode column TEC #2 includes three touch electrodes. (TE 2-1, TE 2-2, TE 2-3), and the third touch electrode column (TEC #3) has three touch electrodes (TE 3-1, TE 3-2, TE 3-3). ) is included.

Meanwhile, there may be three preamplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) corresponding to the three touch electrode columns (TEC #1, TEC #2, TEC #3). .

In the example of FIG. 13 , the touch electrodes TE 1-1, TE 2-1, TE 3-1 positioned in the first row in each of the three touch electrode columns TEC #1, TEC #2, and TEC #3 ) is a touch electrode selected as a “sensing target touch electrode” by the first multiplexer circuit MUX1 during the first time period. Touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2) located in the second and third rows in each of the three touch electrode columns (TEC #1, TEC #2, TEC #3) -3, TE 3-2, TE 3-3) are touch electrodes selected as "non-sensing target touch electrodes" by the first multiplexer circuit MUX1 during the first time period.

Referring to FIG. 13 , according to the first touch driving structure for reducing the influence of the common voltage ripple, the touch panel TSP includes one or more dummy electrodes DE disposed in the outer region of the touch region, and the touch driving circuit. One or more supply lines SUPL for supplying signals from the furnace TDC to one or more dummy electrodes DE, and one or more feedback lines for signal transfer from one or more dummy electrodes DE to the touch driving circuit TDC. (FBL) may be disposed.

Through the structures DE, SUPL, and FBL described above, the touch driving circuit TDC may receive feedback of the common voltage ripple from the outer region of the touch panel TSP.

In the case of the first touch driving structure, the number of feedback lines FBL may be one or several in the touch panel TSP.

For example, as shown in FIG. 13 , the number of feedback lines FBL may be the same as the number of sensing target touch electrodes TE 1-1, TE 2-1, and TE 3-1.

In this first touch driving structure, by disposing the feedback lines FBL as many as the number of the sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1, the sensing target touch electrode TE 1-1, It is possible to make an effective common voltage ripple feedback structure considering the arrangement structure of TE 2-1 and TE 3-1).

On the other hand, when there is one sensing target touch electrode (one of TE 1-1, TE 2-1, TE 3-1) for each touch electrode column (one of TEC #1, TEC #2, and TEC #3) , the number of feedback lines FBL may be the same as the number of touch electrode columns TEC #1, TEC #2, and TEC #3.

Referring to FIG. 13 , during the first time period, the touch driving circuit TDC operates one or more "non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2 through one or more touch lines TL." -2, TE 2-3, TE 3-2, TE 3-3) when the driving signal Vcom is supplied to one or more “dummy electrodes DE” through one or more supply lines SUPL. (Vcom) can be supplied.

Referring to FIG. 13 , the touch driving circuit TDC receives a driving signal Vcom supplied to one or more dummy electrodes DE as feedback through one or more feedback lines FBL, and receives the feedback driving signal FB Vcom. may be supplied to one or more "sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1".

Referring to FIG. 13 , the touch driving circuit TDC includes one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 and one or more pre-amplifiers (Pre-AMP #1, Pre-AMP #1). -AMP #2, Pre-AMP #3) can be done.

Each preamplifier (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) has a first input terminal I1 connected to a feedback line FBL, and a sensing target touch electrode TE 1-1, TE 2-1 and TE 3-1) may include a second input terminal I2 electrically connected to the touch line TL, and an output terminal O for outputting an output signal to the integrator INTG.

The driving signal FB Vcom fed back through the feedback line FBL is a received signal received from the touch panel TSP. It is input to the first input terminal I1, and through the second input terminal I2 of each pre-amplifier (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3), the sensing target touch electrode (TE 1-2) , TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3).

As described above, in the touch display device according to the embodiments of the present invention, the dummy electrode DE is disposed on the outside of the panel, and the non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2- 2, TE 2-3, TE 3-2, TE 3-3) make the same driving state and voltage state as the voltage at the dummy electrode DE through the feedback line FBL connected to the dummy electrode DE The signal indicating the state (FB Vcom) is fed back, and the feedback signal (FB Vcom) is supplied to one or more sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1) to provide a touch driving circuit (TDC). ), even if a common voltage ripple occurs during time-free driving, the touch driving circuit TDC shakes with the same phase and magnitude, thereby minimizing the influence of the common voltage ripple.

The touch panel TSP for the above-described first touch driving structure includes a plurality of touch electrodes TE disposed in a touch area, one or more dummy electrodes DE disposed in an outer area of the touch area, and at least one dummy. It may include one or more feedback lines FBL connected to the electrode DE.

During the first time period, the plurality of touch electrodes TE include one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 selected for the first time period, and one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1. One or more non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3) except for the touch electrodes (TE 1-1, TE 2-1, TE 3-1) -2, TE 3-3).

During the first time period, a driving signal (Vcom) with one or more non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) is supplied, and the driving signal Vcom may be supplied to one or more dummy electrodes DE.

A signal corresponding to a signal output from one or more feedback lines FBL may be supplied to one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1.

As described above, it is possible to provide the touch panel TSP having the first touch driving structure capable of minimizing the influence of the common voltage ripple.

14 is a diagram illustrating a second touch driving structure for preventing deterioration of touch sensitivity and display quality due to a common voltage ripple that may be generated during a driving operation of a touch display device according to embodiments of the present invention.

Referring to FIG. 14 , according to the second touch driving structure, in the touch panel TSP, one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE One or more feedback lines FBL for transmitting signals from 3-2 and TE 3-3) to the touch driving circuit TDC may be disposed.

Through the above-described structures DE, SUPL, and FBL, the touch driving circuit TDC may receive feedback of the common voltage ripple from the touch region of the touch panel TSP.

In the case of the second touch driving structure, the number of feedback lines FBL may be one or several in the touch panel TSP.

For example, as shown in FIG. 14 , the number of feedback lines FBL may be the same as the number of sensing target touch electrodes TE 1-1, TE 2-1, and TE 3-1.

In this second touch driving structure, by disposing the feedback lines FBL as many as the number of the sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1, the sensing target touch electrode TE 1-1, It is possible to make an effective common voltage ripple feedback structure considering the arrangement structure of TE 2-1 and TE 3-1).

On the other hand, when there is one sensing target touch electrode (one of TE 1-1, TE 2-1, TE 3-1) for each touch electrode column (one of TEC #1, TEC #2, and TEC #3) , the number of feedback lines FBL may be the same as the number of touch electrode columns TEC #1, TEC #2, and TEC #3.

Referring to FIG. 14 , during the first time period, the touch driving circuit TDC operates one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3- 2, TE 3-3), the driving signal Vcom is supplied, and one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, The driving signal Vcom supplied to the selected feedback touch electrode (in the example of FIG. 14 , TE 1-2, TE 2-2, TE 3-2) among TE 3-3) is applied to the feedback touch electrode (in the example of FIG. 14 ). , TE 1-2, TE 2-2, TE 3-2) receive feedback through the feedback line (FBL).

The touch driving circuit TDC receives a driving signal FB Vcom fed back through a feedback line FBL connected to one or more feedback touch electrodes (in the example of FIG. 14 , TE 1-2, TE 2-2, TE 3-2). ) is supplied to one or more sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1).

More specifically, with reference to FIG. 14 , the touch driving circuit TDC includes one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 and one or more preamplifiers Pre -AMP #1, Pre-AMP #2, Pre-AMP #3) are included.

Each preamplifier (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) has a first input terminal I1 connected to a feedback line FBL, and a sensing target touch electrode TE 1-1, TE 2-1 and TE 3-1) may include a second input terminal I2 electrically connected to the touch line TL, and an output terminal O for outputting an output signal to the integrator INTG.

The driving signal FB Vcom fed back through the feedback line FBL is a received signal received from the touch panel TSP, and each pre-amplifier (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) ) is input to the first input terminal I1, and the sensing target touch electrode TE 1 through the second input terminal I2 of each pre-amplifier (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3). -1, TE 2-1, TE 3-1).

As described above, in the touch display device according to the embodiments of the present invention, the non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) A signal (FB Vcom) received feedback through a feedback line (FBL) connected to a part of 3-3) is supplied to one or more sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1) to drive a touch By loading the furnace TDC, even if a common voltage ripple occurs during time-free driving, the touch driving circuit TDC shakes with the same phase and magnitude, thereby minimizing the influence of the common voltage ripple.

The touch panel TSP for the above-described second touch driving structure includes a plurality of touch electrodes TE disposed in a touch area, a plurality of touch lines TL connected to the plurality of touch electrodes TE, and a plurality of It may include a plurality of feedback lines FBL connected to the touch electrode TE.

During the first time period, the plurality of touch electrodes TE include one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 selected for the first time period, and one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1. One or more non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3) except for the touch electrodes (TE 1-1, TE 2-1, TE 3-1) -2, TE 3-3).

During the first time period, a driving signal (Vcom) with one or more non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) is supplied, and a feedback line (FBL) connected to one of one or more non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) ), a signal corresponding to the signal FB Vcom may be supplied to one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1.

As described above, it is possible to provide a touch panel TSP having a second touch driving structure capable of minimizing the influence of the common voltage ripple.

Meanwhile, the driving signal applied to the non-sensing target touch electrode (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) corresponds to the load-free driving signal. and a driving signal fed back from the touch panel TSP and applied to the sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 corresponds to the touch driving signal TDS for touch sensing.

According to the time-free driving method, when display driving and touch driving are simultaneously performed, non-sensing target touch electrodes (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) and the driving signal applied to all of the sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1) corresponds to the common voltage (Vcom) required for the display, and the voltage level according to the ground modulation This may be a modulated signal that changes.

As such, the driving signal applied to all the touch electrodes TE is a driving signal related to touch sensing (a touch driving signal, a load-free driving signal) and a common voltage Vcom required for a display. The driving signal is in the form of a modulated signal in which the voltage level is changed, so that it is possible to simultaneously drive the display and drive the touch.

Meanwhile, as shown in FIGS. 6 and 7 , the secondary ground voltage Vgnd2 of the secondary ground GND2 is applied to the display panel DISP, and the voltage level of the secondary ground voltage Vgnd2 is changed. is a modulated signal, and may have an amplitude and a frequency corresponding to the driving signal Vcom applied to the touch electrode TE.

As described above, by grounding the display panel DISP to the secondary ground GND2 having the secondary ground voltage Vgnd2 in the form of a modulated signal, the voltage applied to the touch electrodes TE in the display panel DISP is applied. It is possible to swing the driving signal TDS like the secondary ground voltage Vgnd2.

On the other hand, the touch controller T-CTR, which receives sensing data from the touch driving circuit TDC and calculates the presence or absence of a touch or touch coordinates, has a primary ground different from the secondary ground voltage Vgnd2 applied to the display panel DISP. A voltage Vgnd1 may be applied.

15 is a block diagram of a touch driving circuit (TDC) according to embodiments of the present invention.

15 , in the touch driving circuit TDC according to the embodiments of the present invention, a driving signal ( Vcom) and receives the feedback signal FB Vcom from the touch panel TSP, and drives the feedback signal FB Vcom with one or more sensing target touch electrodes TE A second driving unit 1520 supplied as a signal may be included.

When the above-described touch driving circuit TDC is used, even if a ripple occurs in the touch electrode TE serving as a common electrode, it is possible to prevent a decrease in touch sensitivity and the like.

On the other hand, in the case of the touch driving circuit TDC suitable for the first touch driving structure of FIG. 13 , the first driving unit 1510 uses one or more non-sensing target touch electrodes among the plurality of touch electrodes TE to generate a driving signal Vcom. When , the driving signal Vcom is supplied together to the plurality of touch electrodes TE and one or more other dummy electrodes DE.

Then, the second driving unit 1520 supplies the feedback signal FB Vcom received from the one or more dummy electrodes DE supplied with the driving signal Vcom as a driving signal to one or more sensing target touch electrodes to provide a sensing signal. detect

When the above-described touch driving circuit TDC is used, the feedback signal FB Vcom fed back from the dummy electrode DE located in the outer region of the touch panel TSP is applied to the sensing target touch electrode, so that the dummy electrode DE ) so that the common voltage ripple generated in the sensing target touch electrode is equally generated, the touch driving circuit (TDC) also shakes with the same phase and size as the dummy electrode (DE), so that the effect of the common voltage ripple on touch sensing is reduced. can be eliminated or reduced.

The first driving unit 1510 may include an output buffer BUF and a plurality of amplifiers AMP in FIG. 13 .

The second driving unit 1520 may include pre-amplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) in FIG. 13 .

On the other hand, in the case of the touch driving circuit TDC suitable for the second touch driving structure of FIG. 14 , the first driving unit 1510 transmits the driving signal Vcom to one or more non-sensing target touch electrodes among the plurality of touch electrodes TE. ) is supplied.

In addition, the second driving unit 1520 supplies the feedback signal FB Vcom received from one of the one or more non-sensing target touch electrodes to which the driving signal Vcom is supplied to the one or more sensing target touch electrodes as a driving signal. A detection signal can be detected.

When the above-described touch driving circuit TDC is used, the feedback signal FB Vcom fed back from the non-sensing target touch electrode in the touch region of the touch panel TSP is applied to the sensing target touch electrode, thereby causing the touch electrode TE By making the common voltage ripple generated in the touch electrode equally generated in the sensing target touch electrode, the touch driving circuit (TDC) also shakes in the same phase and size as the touch panel (TSP), thereby eliminating the effect of the common voltage ripple on touch sensing or may be reduced.

The first driving unit 1510 may include an output buffer BUF and a plurality of amplifiers AMP in FIG. 14 .

The second driving unit 1520 may include pre-amplifiers (Pre-AMP #1, Pre-AMP #2, Pre-AMP #3) in FIG. 14 .

The touch driving method described above will be briefly described with reference to FIG. 16 .

16 is a flowchart of a driving method according to embodiments of the present invention.

Referring to FIG. 16 , in the driving method according to embodiments of the present invention, one or more non-sensing target touch electrodes excluding one or more sensing target touch electrodes selected from among a plurality of touch electrodes TE A step of supplying a driving signal (Vcom) to the sensing target TE (S1610), a step of receiving a feedback signal (FB Vcom) from the touch panel (TSP) (S1620), and using the feedback signal (FB Vcom) as a driving signal It may include a step of supplying one or more sensing target touch electrodes (Sensing Target TE) (S1630) and the like.

If the above-described driving method is used, even if a ripple occurs in the touch electrode TE serving as a common electrode, it is possible to prevent a decrease in touch sensitivity and the like.

According to the above-described embodiments of the present invention, a touch display device, a touch panel (TSP), and a touch driving circuit capable of accurately sensing a touch without being affected by panel noise during the sensing process for the touch electrode to be sensed. A furnace (TDC) and a driving method may be provided.

According to embodiments of the present invention, a touch display device, a touch panel (TSP), a touch driving circuit (TDC) and A driving method may be provided.

According to embodiments of the present invention, a touch display device, a touch panel (TSP), and a touch driving circuit (TDC) capable of minimizing the influence of a ripple induced by a touch electrode serving as a common electrode on touch sensing and display and a driving method.

According to embodiments of the present invention, in an environment in which display driving and touch driving are performed at the same time, a touch display device capable of preventing crosstalk between a display and a touch due to ripple caused by a touch electrode serving as a common electrode, a touch A panel TSP, a touch driving circuit TDC, and a driving method may be provided.

The above description and the accompanying drawings are merely illustrative of the technical spirit of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

DISP: display panel
DDC: data driving circuit
GDC: gate driving circuit
D-CTR: Display Controller
TDC: touch driving circuit
T-CTR: Touch Controller

Claims (18)

a touch panel having a plurality of touch electrodes disposed in the touch area; and
and a touch driving circuit for detecting a sensing signal by driving the touch panel,
During the first time period, the plurality of touch electrodes are
one or more sensing target touch electrodes selected for the first time period;
Classified as one or more non-sensing target touch electrodes except for the one or more sensing target touch electrodes,
During the first time period, the touch driving circuit,
supplying a driving signal to the one or more non-sensing target touch electrodes;
supplying the received signal received from the touch panel as a driving signal to the one or more sensing target touch electrodes, detecting the sensing signal from the one or more sensing target touch electrodes,
A ripple present in the received signal received from the touch panel is included in a driving signal supplied to the one or more sensing target touch electrodes through the touch driving circuit.
According to claim 1,
In the touch panel,
one or more dummy electrodes disposed in an outer region of the touch region;
one or more supply lines for supplying signals from the touch driving circuit to the one or more dummy electrodes;
at least one feedback line for transmitting a signal from the at least one dummy electrode to the touch driving circuit is disposed;
The one or more feedback lines connect the one or more dummy electrodes to the touch driving circuit.
3. The method of claim 2,
The number of the one or more feedback lines connected to the one or more dummy electrodes is the same as the number of the sensing target touch electrodes.
3. The method of claim 2,
During the first time period, the touch driving circuit,
When the driving signal is supplied to the one or more non-sensing target touch electrodes, the driving signal is supplied to the one or more dummy electrodes through the one or more supply lines,
receiving the driving signal supplied to the one or more dummy electrodes as feedback through the one or more feedback lines;
A touch display device for supplying the feedback driving signal to the one or more sensing target touch electrodes.
5. The method of claim 4,
The touch driving circuit,
Comprising one or more preamplifiers corresponding to the one or more sensing target touch electrodes,
The preamplifier is
a first input terminal connected to the feedback line;
a second input terminal electrically connected to the sensing target touch electrode through a touch line;
an output terminal for outputting an output signal;
The driving signal fed back through the feedback line is input to the first input terminal and transmitted to the sensing target touch electrode as the driving signal through the second input terminal.
According to claim 1,
In the touch panel,
at least one feedback line for transmitting a signal from the at least one non-sensing target touch electrode to the touch driving circuit is disposed;
The one or more feedback lines connect the one or more non-sensing target touch electrodes to the touch driving circuit.
7. The method of claim 6,
The number of the one or more feedback lines connected to the one or more non-sensing target touch electrodes is the same as the number of the sensing target touch electrodes.
7. The method of claim 6,
During the first time period, the touch driving circuit,
supplying the driving signal to the one or more non-sensing target touch electrodes;
receiving the driving signal supplied to the selected feedback touch electrode among the one or more non-sensing target touch electrodes as feedback through a feedback line connected to the feedback touch electrode;
The feedback driving signal is the received signal.
9. The method of claim 8,
The touch driving circuit,
Comprising one or more preamplifiers corresponding to the one or more sensing target touch electrodes,
The preamplifier is
a first input terminal connected to the feedback line;
a second input terminal electrically connected to the sensing target touch electrode through a touch line;
an output terminal for outputting an output signal;
The driving signal fed back through the feedback line is input to the first input terminal as the received signal, and is transmitted as the driving signal to the sensing target touch electrode through the second input terminal.
According to claim 1,
The touch panel is built into the display panel,
A touch display device for displaying an image on the display panel during the first time period.
11. The method of claim 10,
The driving signal is a modulated signal whose voltage level is changed in the touch display device.
12. The method of claim 11,
A ground voltage is applied to the display panel,
The ground voltage is a modulated signal whose voltage level is changed, and has an amplitude and a frequency corresponding to the driving signal.
In the touch panel,
a plurality of touch electrodes disposed in the touch area;
one or more dummy electrodes disposed in an outer region of the touch region; and
one or more feedback lines connected to the one or more dummy electrodes;
During the first time period, the plurality of touch electrodes are
one or more sensing target touch electrodes selected for the first time period;
Classified as one or more non-sensing target touch electrodes except for the one or more sensing target touch electrodes,
During the first hour period,
a driving signal is supplied to the one or more non-sensing target touch electrodes, and a driving signal is supplied to the one or more dummy electrodes;
A signal corresponding to the signal output from the one or more feedback lines is supplied to the one or more sensing target touch electrodes,
A touch panel in which a ripple present in a signal output from the one or more feedback lines is included in a signal supplied to the one or more sensing target touch electrodes.
In the touch panel,
a plurality of touch electrodes disposed in the touch area;
a plurality of touch lines connected to the plurality of touch electrodes; and
and a plurality of feedback lines connected to the plurality of touch electrodes,
During the first time period, the plurality of touch electrodes are
one or more sensing target touch electrodes selected for the first time period;
Classified as one or more non-sensing target touch electrodes except for the one or more sensing target touch electrodes,
During the first hour period,
A driving signal is supplied to the one or more non-sensing target touch electrodes,
A signal corresponding to a signal output from a feedback line connected to one of the one or more non-sensing target touch electrodes is supplied to the at least one sensing target touch electrode,
The ripple present in the signal output from the feedback line is included in the signal supplied to the one or more sensing target touch electrodes.
In the touch driving circuit for driving a touch panel in which a plurality of touch electrodes are disposed in a touch area,
a first driving unit for supplying a driving signal to one or more non-sensing target touch electrodes excluding one or more selected sensing target touch electrodes from among the plurality of touch electrodes; and
a second driving unit receiving a feedback signal from the touch panel and supplying the feedback signal as the driving signal to the one or more sensing target touch electrodes;
A driving circuit in which a ripple present in the feedback signal is included in the driving signal supplied to the one or more sensing target touch electrodes through the second driving unit.
16. The method of claim 15,
The first driving unit,
When the driving signal is supplied to the one or more non-sensing target touch electrodes among the plurality of touch electrodes,
supplying the driving signal together to the plurality of touch electrodes and one or more other dummy electrodes,
The second driving unit,
A driving circuit for supplying the feedback signal received from the one or more dummy electrodes to which the driving signal is supplied to the one or more sensing target touch electrodes as the driving signal.
17. The method of claim 16,
The first driving unit,
supplying the driving signal to the one or more non-sensing target touch electrodes among the plurality of touch electrodes;
The second driving unit,
A driving circuit for supplying the feedback signal received from one of the one or more non-sensing target touch electrodes to which the driving signal is supplied to the one or more sensing target touch electrodes as the driving signal.
In the driving method of driving a touch panel in which a plurality of touch electrodes are disposed in a touch area,
supplying, by the touch driving circuit, a driving signal to one or more non-sensing target touch electrodes except for one or more sensing target touch electrodes selected from among the plurality of touch electrodes;
receiving, by the touch driving circuit, a feedback signal from the touch panel; and
and supplying, by the touch driving circuit, the feedback signal as the driving signal to the one or more sensing target touch electrodes,
A driving method in which a ripple present in the feedback signal is included in the driving signal supplied to the one or more sensing target touch electrodes through a touch driving circuit.

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