KR101843462B1 - Liquid crystal display apparatus comprising a touch screen - Google Patents

Abstract

The present invention relates to a liquid crystal display device including a touch screen capable of reducing the parasitic capacitance and improving the touch sensing performance.
A liquid crystal display device including a touch screen according to an exemplary embodiment of the present invention is a liquid crystal display device including a touch screen having a touch electrode formed in a liquid crystal panel. The liquid crystal display device has the same structure as a driving wiring and an auxiliary wiring data line formed in the same direction as a gate line A sensing wiring formed in a direction of a first direction; A plurality of touch driving electrodes connected to the driving wiring and connected in a first direction; And a plurality of touch sensing electrodes formed on the same layer as the plurality of touch driving electrodes, wherein the plurality of touch sensing electrodes are divided into a plurality of partial sensing electrodes, and the plurality of partial sensing electrodes are connected to the sensing wiring, And connected in a second direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal display (LCD)

The present invention relates to a display device, and more particularly, to a liquid crystal display device including a touch screen capable of reducing a parasitic capacitance to improve touch sensing performance.

As mobile electronic devices such as mobile communication terminals and notebook computers are developed, a demand for a flat panel display apparatus that can be applied thereto is increasing.

Examples of flat panel display devices include a liquid crystal display apparatus (LCD), a plasma display panel (PDP), a field emission display apparatus (FED), an organic light emitting diode (OLED) A diode display apparatus, and an electrophoretic display apparatus (EPD) have been developed.

Of these flat panel display devices, liquid crystal display devices are being applied to the fields of development of mass production technology, ease of driving means, low power consumption, high image quality and large screen realization.

2. Description of the Related Art In recent years, a touch screen capable of inputting information directly to a screen by using a finger or a pen has been applied in place of an input device such as a mouse or a keyboard, which has been conventionally applied as an input device of a liquid crystal display device.

According to a structure in which a touch screen is coupled to a display panel, an in-cell type in which cells are refracted in a display panel, an on-cell type formed in an upper part of the display panel, and an add- Can be distinguished.

2. Description of the Related Art In application of a touch screen to a display device, a touch screen is built in a display panel for slimness, that is, an in-cell type is being developed.

In US Pat. No. 7,859,521 B2, a touch driving electrode is formed by connecting a patterned common electrode in a lateral direction, and a touch sensing electrode is formed perpendicularly to a touch driving electrode. Such an in-cell type touch screen senses a change in capacitance due to a user's touch through a touch sensing electrode and detects the touch position.

In this case, not only a capacitance between the touch driving electrode and the touch sensing electrode but also a parasitic capacitance is formed on the touch screen. The parasitic capacitance acts as noise to detect a change in the capacitance. Accordingly, when the parasitic capacitance is large, the touch sensing performance is degraded.

Also, the parasitic capacitance increases the RC delay of the touch signal to lower the touch sensing efficiency, and when the touch screen is formed in a large size, the parasitic capacitance increases and the touch sensing efficiency deteriorates.

In recent years, as a display device has become larger, a touch screen to be applied to the display device has also become larger. Therefore, there is a demand for a touch screen and a display device which are advantageous for reducing the parasitic capacitance and increasing the size.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device including a touch screen capable of improving touch sensing performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device including a touch screen capable of preventing deterioration of touch sensing performance due to an RC delay of a touch screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a touch screen advantageous for enlargement and a display device including the touch screen.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

A liquid crystal display device including a touch screen according to an exemplary embodiment of the present invention is a liquid crystal display device including a touch screen having a touch electrode formed in a liquid crystal panel. The liquid crystal display device has the same structure as a driving wiring and an auxiliary wiring data line formed in the same direction as a gate line A sensing wiring formed in a direction of a first direction; A plurality of touch driving electrodes connected to the driving wiring and connected in a first direction; And a plurality of touch sensing electrodes formed on the same layer as the plurality of touch driving electrodes, wherein the plurality of touch sensing electrodes are divided into a plurality of partial sensing electrodes, and the plurality of partial sensing electrodes are connected to the sensing wiring, And connected in a second direction.

The liquid crystal display device including the touch screen according to the embodiment of the present invention can improve the touch sensing performance.

The liquid crystal display device including the touch screen according to the embodiment of the present invention can compensate for the deterioration of the touch sensing performance due to the RC delay of the touch screen.

The embodiments of the present invention can provide a touch screen advantageous for enlargement and a liquid crystal display device including the touch screen.

The liquid crystal display device including the touch screen according to the embodiment of the present invention can simultaneously reduce the time required for touch sensing by driving the touch driving electrodes in groups of a certain number of units.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 illustrates a liquid crystal display device including a touch screen according to an embodiment of the present invention.
2 illustrates a touch screen and a touch driving circuit according to an exemplary embodiment of the present invention.
3 is a view showing an example of a structure in which a touch sensing electrode and a sensing wiring are in contact with each other.
4 to 7 are views illustrating a method of manufacturing a liquid crystal display device including a touch screen according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating an effect of reducing parasitic capacitance through a liquid crystal display device including a touch screen according to an embodiment of the present invention. FIG.

Hereinafter, a liquid crystal display device including a touch screen will be described with reference to the accompanying drawings.

In describing an embodiment of the present invention, when it is stated that a structure is formed on or on top of another structure and 'below or below', such a substrate is not limited to the case where these structures are in contact with each other, To the extent that the third structure is interposed therebetween.

The liquid crystal display device has been developed in various ways such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode according to a method of adjusting the arrangement of liquid crystal layers.

In the TN mode and the VA mode, a pixel electrode is formed on a lower substrate and a common electrode is formed on an upper substrate to control the alignment of the liquid crystal layer through a vertical electric field.

In the IPS mode and the FFS mode, a pixel electrode and a common electrode are disposed on a lower substrate, and the arrangement of the liquid crystal layer is adjusted by an electric field between the pixel electrode and the common electrode.

In the IPS mode, the pixel electrode and the common electrode are alternately arranged in parallel so that a horizontal electric field is generated between both electrodes to adjust the alignment of the liquid crystal layer. In such an IPS mode, the alignment of the liquid crystal layer is not adjusted in the pixel electrode and the upper portion of the common electrode, so that the transmittance of light is reduced in the region.

The FFS mode is designed to solve the shortcomings of the IPS mode. In the FFS mode, the pixel electrode and the common electrode are spaced apart with an insulating layer therebetween.

At this time, one electrode is formed in a plate shape or a pattern and the other electrode is formed in a finger shape, and the arrangement of the liquid crystal layer is controlled through a fringe field generated between the electrodes Method.

The display device according to the embodiment of the present invention can be applied to both the vertical electric field system (TN mode, VA mode) and the horizontal electric field system (IPS mode, FFS mode) without limitation of mode. The applied example will be described as an example.

1 is a view illustrating a liquid crystal display device including a touch screen according to an embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display device including a touch screen according to an embodiment of the present invention includes a liquid crystal panel 100 having an in-cell touch type touch screen (touch sensor) incorporated therein; A backlight unit 800; And a driving circuit unit.

Although the touch driving circuit unit 200 and the touch sensing circuit unit 300 are shown as separate components in FIG. 1, the touch driving circuit unit 200 and the touch sensing circuit unit 300 may be integrated into one driving circuit unit have.

In the liquid crystal panel 100, a plurality of pixels for displaying an image are arranged in a matrix form, and a touch screen (touch sensor) for detecting a user's touch position is arranged in an in-cell touch type . The construction and structure of the touch screen of the present invention will be described in detail later.

The liquid crystal panel 100 includes a color filter array substrate (upper substrate), a TFT array substrate (lower substrate), and a liquid crystal layer interposed between the two substrates.

Red, green, and blue color filters for displaying a full color image are formed on the color filter array substrate (upper substrate), and a black matrix for separating pixels is formed between the color filters do.

On the other hand, a plurality of pixels are formed on a TFT array substrate (lower substrate), and each of the plurality of pixels is defined by data lines DL1 to DLm and gate lines GL1 to GLn intersecting with each other.

A TFT and a storage capacitor Cst are formed for each region where the data lines and the gate lines cross each other. The gate electrode of the TFT is connected to the gate line, the source electrode is connected to the data line, and the drain electrode is connected to the pixel electrode.

The driving circuit unit includes a touch driving circuit unit 200, a touch sensing circuit unit 300, a timing controller 400, a T-con, a gate driver 500, a G-IC, a data driver 600, a D- 700, an LED driver), and a power supply unit (not shown).

Here, all or a part of the driving circuit portion may be formed on the liquid crystal panel 100 by a COG (Chip On Glass) or a COF (Chip On Flexible Printed Circuit) method.

The timing controller 400 converts the video signal data input from the outside into digital video data R (R) by using the vertical synchronizing signal V-sync, the horizontal synchronizing signal H-sync and the clock signal CLK. , G, B). The timing controller 400 supplies the data driver 600 with digital image data arranged in units of frames.

The timing controller 400 generates a gate control signal GCS for controlling the gate driver 500 using the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync and the clock signal CLK, A data control signal (DCS) for controlling the driver 600 and a backlight control signal (BCS) for removing the backlight driver.

The timing controller 400 supplies the generated gate control signal GCS to the gate driver 500 and supplies the data control signal DCS to the data driver 600 and supplies the backlight control signal BCS to the backlight driver 700).

Here, the data control signal DCS includes a source start pulse (SSP), a source sampling clock (SSC), a source output enable (SOE) and a polarity control signal (POL) ), And the like.

The gate control signal GCS may include a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable (GOE).

The timing controller 400 generates a touch control signal (TCS) for controlling the touch driving circuit unit 200 and supplies the touch control signal to the touch driving circuit unit 200.

The gate driver 500 generates a scan signal (gate drive signal) for driving the TFT formed in each of the plurality of pixels based on the gate control signal GCS from the timing controller 400. [

The gate driver 500 sequentially supplies a scan signal to a plurality of gate lines formed in the liquid crystal panel 100 in a first period for displaying an image in one frame period. A TFT formed in each pixel is driven by a scan signal to switch pixels.

The data driver 600 converts the digital image data (R, G, B) supplied from the timing controller 400 into an analog image signal, that is, a data voltage.

The data driver 600 supplies a data voltage to a plurality of data lines formed in the liquid crystal panel 100 in accordance with the time when the TFTs of the respective pixels are turned on based on the data control signal DCS from the timing controller 400 do.

Since the liquid crystal panel 100 can not generate light itself, the liquid crystal panel 100 displays an image using light supplied from the backlight unit 800.

The backlight unit 800 irradiates light to the liquid crystal panel 100 and includes a plurality of backlights that generate light and a backlight unit that guides light generated from the backlight toward the liquid crystal panel and improves efficiency of light (A light guide plate or a diffusion plate and a plurality of optical sheets).

Off time of the backlight based on the backlight control signal BCS input from the timing controller 400. The on-off time of the backlight, the on- And luminance can be controlled.

2 is a diagram illustrating a touch screen and a touch driving circuit according to an embodiment of the present invention.

Referring to FIG. 2, a common electrode is formed on a TFT array substrate (lower substrate) so as to correspond to a pixel electrode in order to form an electric field in each pixel. The common electrode functions not only for displaying an image but also for touch electrodes 110 and 120 for detecting a touch position of a user. The touch electrodes 110 and 120 include a touch driving electrode 110 to which a touch driving signal is supplied and a touch sensing electrode 120 to detect a change in capacitance. The common electrodes, that is, the touch electrodes 110 and 120 are formed of a transparent conductive material such as ITO (Indium Tin Oxide).

One frame is divided into a first period for displaying an image and a second period for non-display period, and signals (pixel voltage and common voltage) for displaying an image are supplied to the pixel electrode and the common electrode in the first period.

Meanwhile, in the second period, a touch driving signal for touch sensing is supplied to the touch driving electrode 110, and a change in capacitance caused by the touch of the user is sensed through the touch sensing electrode 120 to detect the presence / .

To this end, a plurality of touch driving electrodes 110 are connected through the driving wiring 130, and are connected to the touch driving circuit unit 200. The touch sensing electrode 120 is connected to the touch sensing circuit unit 300 through the sensing wiring 140.

The plurality of touch driving electrodes 110 are connected in a first direction (e.g., the X-axis direction) through the driving wiring 130 and the touch sensing electrodes 120 are connected to the touch sensing electrodes 120 in the second direction As an example, in the Y-axis direction). As described above, the touch driving electrode 110 and the touch sensing electrode 120 are connected in the X-axis and Y-axis directions to detect the touch position of the user.

Referring again to FIG. 1, the touch driving circuit unit 200 generates a touch driving signal for touch sensing based on a touch control signal TCS input from the timing controller 400. The touch driving circuit unit 200 supplies a touch driving signal to the plurality of touch driving electrodes 110.

In this way, when the common electrode is used as the touch driving electrode 110, the common voltage Vcom is supplied to the touch driving electrode 110 and the touch sensing electrode 120 in the first period in which an image is displayed in one frame . Thereafter, in the second period of the non-display period, a touch driving signal for touch sensing is supplied to the plurality of touch driving electrodes 110. [

Meanwhile, the touch sensing circuit unit 300 compares the capacitance inputted through the touch sensing electrode 120 with the reference capacitance to detect the presence or absence of touch by the user and the touch position. Then, the detected touch position is output as a touch sensing signal (TSS).

3 is a view illustrating an example of a structure in which a touch sensing electrode is in contact with a sensing line, and FIGS. 4 to 7 illustrate a method of manufacturing a liquid crystal display device including a touch screen according to an embodiment of the present invention . 3 to 7, a structure of the touch sensing electrode 120 and a structure in which the sensing electrode 140 and the sensing electrode 120 are in contact with each other will be described.

The touch driving electrodes 110 are connected to a driving wire 130 formed in a first direction and a contact 150 and connected to the touch driving circuit unit 200 to apply a touch driving signal supplied from the touch driving circuit unit 200 to a pixel .

In the liquid crystal display device including the touch screen according to the embodiment of the present invention, the touch sensing electrode 120 is composed of a plurality of partial sensing electrodes 122. In FIG. 2, the touch sensing electrode 120 formed on one vertical line is formed of three partial sensing electrodes 122.

The touch sensing electrode 120 is formed in a direction crossing the driving wiring 130 and includes a first partial sensing electrode 122, a second partial sensing electrode 122 and a third partial sensing electrode 122 ). The divided partial sensing electrodes 122 are connected to the touch sensing circuit unit 300 through the sensing wiring 140 and supply the touch sensing signal, that is, the capacitance formed in the sensing wiring 140 to the touch sensing circuit unit 300.

At this time, the three partial sensing electrodes 122 are connected to the touch sensing circuit 300 through the first sensing wiring 142, the second sensing wiring 144, and the third sensing wiring 146.

2 and 3, the touch sensing electrode 120 formed on one vertical line is divided into three partial sensing electrodes 122. However, the present invention is not limited thereto, and the touch sensing electrode 120 may be divided into four or more portions And may be divided into sensing electrodes 122.

As shown in FIG. 3, each of the plurality of partial sensing electrodes 122 may be divided into a plurality of minute electrodes 122a, 122b, and 122c. 3, each of the plurality of partial sensing electrodes is divided into three microelectrodes 122a, 122b, and 122c. However, the present invention is not limited to this, and a plurality of partial sensing electrodes may be divided into four or more microelectrodes .

As shown in FIG. 4, a gate line and a gate electrode of a TFT are formed of a gate metal, and a driving wiring 130 connecting the touch driving electrodes 110 is formed. At this time, an auxiliary wiring 132 for connecting the plurality of micro-electrodes 122a, 122b, and 122c of the partial sensing electrode 122 is also formed.

As shown in FIG. 5, after a gate insulating film and a semiconductor layer (active) are formed, a data line is formed of a data metal. Through this, a pixel region is defined, and the formation of the TFT is completed.

As shown in FIG. 6, an organic insulating film is applied and a pixel electrode is formed. Then, after the contact hole is formed, the contact 150 is formed of a conductive material to contact the pixel electrode and the drain electrode of the TFT.

Referring to FIG. 7, after an insulating layer is formed on the data lines and the pixel electrodes, the sensing lines 140 are formed to overlap the data lines. Here, the sensing wiring 140 is formed of a metal material of the data line. Thereafter, a common electrode is formed so as to overlap the pixel electrode. At this time, the common electrode may be patterned to have a plurality of slits, or may be patterned to have a finger shape.

The driving wiring 130 connecting the touch driving electrode 110 and the sensing wiring 140 connecting the partial sensing electrodes 122 of the touch sensing electrode 120 are located on different layers.

2 and 3, the liquid crystal panel 100 is provided with N driving wirings 130, and the touch driving circuit unit 200 is connected to the touch sensing unit via the N driving wirings 130 1 driving signal to the N driving signals to the plurality of touch driving electrodes 110 in sequence.

Here, the plurality of touch driving electrodes 110 are grouped by unit of the partial sensing electrodes 122, and the touch driving circuit unit 200 may simultaneously drive the plurality of touch driving electrodes 110 in groups.

At this time, the touch driving circuit unit 200 may supply the first driving signal to the group of the touch driving electrodes 110 corresponding to the first partial sensing electrodes among the plurality of partial sensing electrodes 122.

In addition, the touch driving circuit unit 200 may supply the second driving signal to a group of the touch driving electrodes 110 corresponding to the second partial sensing electrodes among the plurality of partial sensing electrodes 122.

The touch driving circuit unit 200 may supply a third driving signal to a group of the touch driving electrodes 110 corresponding to the third partial sensing electrode among the plurality of partial sensing electrodes 122.

The plurality of microelectrodes 122a, 122b and 122c are connected to each other through the auxiliary wiring 132 to form one partial sensing electrode 122. [ The partial sensing electrode 122 is electrically connected to the sensing wiring 140.

Here, the partial sensing electrode 122, the sensing wiring 140, the plurality of micro-electrodes 122a, 122b, and 122c, and the auxiliary wiring 132 are electrically connected through the contact 150.

As one example, the partial sensing electrode 122 and the sensing wiring 140 are electrically connected through the first contact 152. At this time, the first contact 152 may be a direct contact.

On the other hand, the plurality of micro-electrodes 122a, 122b, and 122c and the auxiliary wiring 132 are electrically connected through the second contact 154. [ Here, since the plurality of microelectrodes 122a, 122b, and 122c and the auxiliary wiring 132 are formed on different layers, they can be connected to each other through a contact (second contact) using a contact hole.

As described above, the touch sensing electrode 120 and the sensing wiring 140 are formed so as to overlap each other and are divided into a plurality of partial sensing electrodes of the touch sensing electrode 120 on one vertical line, The parasitic capacitance can be reduced.

Referring to FIG. 2, the touch driving circuit unit 200 may sequentially drive the first driving signal T1 to the ninth driving signal T9 for touch sensing, and may be supplied to the touch driving electrode 110. FIG.

The touch driving circuit unit 200 may supply driving signals corresponding to the first to the ninth driving signals T 1 to T 9 so as to correspond to the first partial sensing electrodes. T9, T4, and T7 signals can be simultaneously driven.

The touch driving circuit unit 200 may simultaneously drive the T2 signal, the T5 signal, and the T8 signal among the first driving signal T1 to the ninth driving signal T9 so as to correspond to the second partial sensing electrode.

Then, the touch driving circuit unit 200 may simultaneously drive the T3 signal, the T6 signal, and the T9 signal among the first driving signal T1 to the ninth driving signal T9 so as to correspond to the third partial sensing electrode.

If the driving signals are sequentially supplied to the touch driving electrodes corresponding to the three lines in this way, the touch sensing time is set to be 1 (one) times longer than when the driving signals are sequentially supplied from the first (first) line to the last / 3. Thus, the number of touch sensing times can be increased three times at the same time.

As in the case of the liquid crystal display device including the touch screen according to the embodiment of the present invention, when the touch driving electrodes 110 are simultaneously driven for each group of a certain number of units and the number of times of touch sensing is increased at the same time, The touch sensing performance (sensitivity) can be improved.

FIG. 8 is a diagram illustrating an effect of reducing a parasitic capacitance through a liquid crystal display device including a touch screen according to an embodiment of the present invention.

Referring to FIG. 8, it can be seen that the parasitic capacitance of the touch screen can be reduced by dividing it into a plurality of partial sensing electrodes of the touch sensing electrode 120 formed on one vertical line. Compared to one touch sensing electrode. When the touch sensing electrode 120 is formed of three partial sensing electrodes, the parasitic capacitance can be reduced to one third.

The parasitic capacitance acts as noise to detect a change in capacitance and increases the RC delay of the touch signal. Thus, as in the present invention, the touch sensing efficiency can be improved by reducing the parasitic capacitance. In addition, by reducing the parasitic capacitance, it is possible to produce a big screen of Turkey.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: liquid crystal panel 110: touch driving electrode
120: touch sensing electrode 122: partial sensing electrode
122a, 122b, 122c: microelectrode 130: driving wiring
132: auxiliary wiring 140: touch sensing wiring
200: touch driving circuit unit 300: touch sensing circuit unit
400: timing controller 500: gate driver
600: Data driver 700: Backlight driver
800: Backlight unit

Claims (9)

A liquid crystal display device comprising a touch screen having a touch electrode formed in a liquid crystal panel,
Driving wiring and auxiliary wiring formed in the same direction as the gate line
A sensing wiring formed in the same direction as the data line;
A plurality of touch driving electrodes connected to the driving wiring and connected in a first direction; And
And a plurality of touch sensing electrodes formed on the same layer as the plurality of touch driving electrodes,
Wherein the plurality of touch sensing electrodes are divided into a plurality of partial sensing electrodes, the plurality of partial sensing electrodes are connected to the sensing wiring in a second direction,
Each of the plurality of partial sensing electrodes is connected to a touch sensing circuit through different sensing wires,
Wherein each of the plurality of partial sensing electrodes comprises a plurality of minute electrodes divided in the first direction,
Wherein the plurality of microelectrodes constituting one partial sensing electrode are connected to each other through an auxiliary wiring formed in the first direction. The method according to claim 1,
Wherein the driving wiring is formed of a metal of a gate line, and the touch sensing electrode is formed of a metal of the data line. The method according to claim 1,
Wherein the driving wiring is formed in a first direction,
The sensing wiring is formed in a second direction intersecting with the first direction,
Wherein the sensing wiring is formed to overlap the data line with an insulating film interposed therebetween. The method of claim 3,
Wherein the plurality of microelectrodes are connected to each other through an auxiliary wiring formed in the same direction as the driving wiring and a contact using the contact hole. 5. The method of claim 4,
A touch driving circuit for supplying a driving signal for touch detection to the plurality of touch driving electrodes; And
And a touch sensing circuit unit for sensing a touch position of a user through a touch detection signal from a plurality of touch sensing electrodes. 6. The method of claim 5,
Wherein N driving wirings are provided, and the touch driving circuit unit sequentially supplies the first driving signal to the N driving signals for touch sensing through the N driving wirings to the plurality of touch driving electrodes. A liquid crystal display device comprising a screen. The method according to claim 6,
Wherein the plurality of touch driving electrodes are grouped by a unit of a partial sensing electrode, and the touch driving circuit unit simultaneously drives a plurality of touch driving electrodes by a group. 8. The method of claim 7,
Wherein the touch driving circuit unit supplies a first driving signal to a group of touch driving electrodes corresponding to a first partial sensing electrode among the plurality of partial sensing electrodes,
Supplying a second driving signal to a group of touch driving electrodes corresponding to a second partial sensing electrode among the plurality of partial sensing electrodes,
And a third driving signal is supplied to a group of touch driving electrodes corresponding to a third partial sensing electrode among the plurality of partial sensing electrodes. The method according to claim 1,
Wherein the plurality of touch driving electrodes and the plurality of touch sensing electrodes function as a common electrode during a period of displaying an image and function as a touch electrode during a non-display period during which no image is displayed. Device.

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