KR102261581B1 - Display device with a touch panel and method of driving the same - Google Patents

Abstract

The present invention relates to a display device equipped with a touch panel, and more particularly, after the touch driving signal is supplied to the touch panel during a touch sensing period, and then during an image output period, a common voltage is supplied to the touch panel. An object of the present invention is to provide a display device having a panel and a driving method thereof.

Description

A display device equipped with a touch panel and a driving method therefor {DISPLAY DEVICE WITH A TOUCH PANEL AND METHOD OF DRIVING THE SAME}

The present invention relates to a display device and a driving method thereof, and more particularly, to a display device having a touch panel and a driving method thereof.

Touch panels are liquid crystal display (LCD), field emission display (FED), plasma display panel (PDP), electroluminescent display (ELD), electrophoresis It is provided in a display device such as an electrophoretic display (EPD), etc., and is a type of input device that allows a user to input information by directly contacting a screen with a finger or a pen while looking at the display device.

In a method of manufacturing a display device having a touch panel, an add-on method in which a panel for outputting an image and a touch panel for detecting whether a touch is made are separately manufactured and then adhered, and a touch panel to a panel for outputting an image The built-in in-cell method and the like are included.

In a method of driving a display device having a touch panel, a mutual method in which a touch driving signal is sequentially supplied to touch electrodes divided into driving electrodes and receiving electrodes, and a touch driving signal being supplied to a plurality of touch electrodes The self-cap method is included.

1 is an exemplary diagram illustrating timing diagrams of various signals applied to a conventional display device equipped with a touch panel, and in particular, signals applied to a display device equipped with a mutual touch panel.

In the display device using the in-cell method and the mutual method, the common electrode, which is also used as a touch electrode, is time-divided and driven by the touch synchronization signal TSS.

For example, in the touch sensing period T, the touch driving signal Vd is sequentially supplied to the driving electrodes constituting the common electrode. As a more specific example, as shown in FIG. 1 , the first touch driving signal Vd1 is supplied to the first driving electrode in the first touch sensing period T1 , and the second touch driving signal Vd1 is supplied in the second touch sensing period T2 . The second touch driving signal Vd2 may be supplied to the driving electrode.

A reference voltage Vref is supplied to the driving electrodes to which the touch driving signal is not supplied during the touch sensing period T.

In the touch sensing period T, the reference voltage Vref is supplied to the receiving electrodes.

In the image output period D, a common voltage Vcom is supplied to the driving electrodes and the receiving electrodes.

In more detail, when the touch sensing period T and the image output period D are repeated, the touch sensing signals Vref, Vd1, Vd2 and the common voltage Vcom are repeatedly switched.

For example, the reception electrode signal Vrx supplied to the reception electrodes may be the common voltage Vcom or the reference voltage Vref.

Also, the driving electrode signal Vtx1 or Vtx2 supplied to the driving electrodes may be the touch driving signal Vd1 or Vd2 or the reference voltage Vref.

When the number of the driving electrodes is 32, one frame period is divided into 64 for 120Hz driving, and 32 image output periods and 32 touch sensing periods are repeated. In this case, one frame period is 16.7 ms.

As described above, for a short period of time, the voltage for sensing the touch and the voltage for outputting the image are switched. In this case, a delay may occur due to a load, and the common voltage supplied to the touch electrodes during the image output period may become unstable due to the delay. Accordingly, a horizontal line may be seen on the panel on which the touch electrodes are formed.

For example, as shown in FIG. 1 , the receiving electrode signal Vrx supplied to the receiving electrode is converted to the common voltage Vcom or the reference voltage Vref by the touch synchronization signal TSS. is switched In this case, when the touch synchronization signal TSS rises to the image output period D, the reference voltage Vref becomes the common due to a delay caused by the load of the receiving electrode. A delay period X that is gradually converted into a voltage Vcom is generated.

Also, during the delay period X, the touch driving signal Vd or the reference voltage Vref is gradually converted into the common voltage Vcom due to a delay caused by the load of the driving electrode.

Accordingly, during the delay period X, a normal image is not output to the panel. Accordingly, a horizontal line defect may occur in the panel.

The horizontal line defect due to the delay period X may occur not only in the display device using the mutual method described above, but also in the display device using the self-cap method.

The present invention is intended to solve the above-described problem, and is provided with a touch panel in which a common voltage is supplied to the touch panel during an image output period after the touch driving signal is supplied to the touch panel during a touch sensing period. It is a technical task to provide a display device and a method for driving the same.

A display device provided with a touch panel according to the present invention for achieving the above object includes: a panel having a built-in touch panel including touch electrodes that are also used as common electrodes; a panel driver driving the panel so that the panel outputs an image; and a touch sensing unit that supplies a touch driving signal to the touch panel during a touch sensing period and determines whether there is a touch on the touch panel using a sensing signal received from the touch panel, wherein in the touch sensing period After the touch driving signal is supplied to the touch panel, a common voltage is supplied to the touch panel during the image output period.

In a display device driving method according to the present invention for achieving the above object, a touch driving signal is supplied to a touch panel built in a panel during a touch sensing period, and the touch is performed using a sensing signal received from the touch panel. determining whether there is a touch on the panel; and supplying a common voltage to the touch panel during an image output period after the touch driving signal is supplied to the touch panel during the touch sensing period, wherein the image is output through the panel during the image output period. This is output.

According to the present invention, the common voltage Vcom may be previously supplied to the driving electrode and the receiving electrode immediately before the image output period starts, that is, immediately before the touch sensing period ends. Accordingly, a stabilized DC common voltage may be supplied to the driving electrode and the receiving electrode during the image output period, and accordingly, the horizontal line defect may be improved.

1 is an exemplary diagram illustrating timing diagrams of various signals applied to a conventional display device equipped with a touch panel.
2 is an exemplary view showing the configuration of a display device equipped with a touch panel according to the present invention.
3 is an exemplary view showing a touch panel applied to a display device equipped with a touch panel according to the present invention.
4 is an exemplary diagram illustrating a configuration of a touch driving unit among touch sensing units applied to a display device equipped with a touch panel according to the present invention.
5 is an exemplary view showing the configuration of a receiver applied to a display device equipped with a touch panel according to the present invention.
6 is an exemplary diagram illustrating timing diagrams of various signals applied to a display device equipped with a touch panel according to the present invention.

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

FIG. 2 is an exemplary view showing the configuration of a display device with a touch panel according to the present invention, and FIG. 3 is an exemplary view showing a touch panel applied to the display device with a touch panel according to the present invention.

A display device with a touch panel according to the present invention (hereinafter simply referred to as a 'display device') is a touch panel 500 including touch electrodes that are also used as common electrodes, as shown in FIGS. 2 and 3 . ) is embedded in the panel 100, the panel drivers 200, 300, and 400 for driving the panel 100 so that the panel 100 outputs an image, and during a touch sensing period, the touch panel 500 and a touch sensing unit 600 that supplies a touch driving signal to the touch panel and determines whether there is a touch on the touch panel 500 using a sensing signal received from the touch panel 500 . In particular, in the display device according to the present invention, after the touch driving signal is supplied to the touch panel 500 during the touch sensing period, a common voltage is supplied to the touch panel 500 during the image output period. .

First, the touch panel 500 applied to the present invention uses a capacitive method and is disposed on the panel 100 . In particular, the touch panel 500 is of an in-cell type, and is disposed on the panel 100 . In the touch panel 500 using the in-cell type, the touch electrodes are embedded in the panel 100 .

The touch panel 500 is configured in a mutual method or a self-cap method.

As shown in FIG. 3 , the touch panel 500 using the mutual method applies a sensing signal generated by the driving electrodes TX to which the touch driving signal is sequentially supplied and the touch driving signal to the touch. It includes receiving electrodes RX that are transmitted to the sensing unit 600 . The touch electrodes include the driving electrodes TX and the receiving electrodes RX.

The touch panel 500 using the self-cap method includes touch electrodes that receive the touch driving signal and transmit the sensing signal to the touch sensing unit 600 .

Hereinafter, for convenience of description, a touch panel 500 using the mutual method as shown in FIG. 3 will be described as an example of the present invention.

In the touch panel 500 using the mutual method, the driving electrodes TX are connected to the touch sensing unit 600 through driving electrode lines TL1 to TLk. The receiving electrodes RX are connected to the touch sensing unit 600 through receiving electrode lines RL1 to RLs.

As shown in FIG. 3 , the touch panel 500 includes a driving electrode TX composed of a plurality of unit driving electrodes provided in a first direction and a receiving electrode provided in a second direction perpendicular to the first direction. electrode RX.

The first direction may be a horizontal direction of the touch panel 500 or a vertical direction of the touch panel 500 . 3 shows the touch panel 500 in which the first direction is a horizontal direction.

In this case, the driving electrode TX extends along the horizontal direction of the touch panel 500 . The unit driving electrode means a unit constituting one driving electrode TX. Although the structure in which the unit driving electrodes are connected to each other is not clearly illustrated in FIG. 3 , the unit driving electrodes are electrically connected to each other to form one driving electrode TX.

In addition, in FIG. 3 , the receiving electrode RX extends along the vertical direction of the touch panel 500 .

The touch panel 500 is provided with a plurality of the driving electrodes TX and a plurality of the receiving electrodes RX. The number of the driving electrodes TX and the number of the receiving electrodes RX may be variously changed according to the size and shape of the touch panel.

In particular, in FIGS. 2 and 3 , k driving electrodes TX are connected to the touch sensing unit 600 through k driving electrode lines TL1 to TLk, and s receiving electrodes ( RX) are connected to the touch sensing unit 600 through the s receiving electrode lines RL1 to RLs.

Second, the panel 100 outputs an image. A plurality of pixels 110 are disposed on the panel 100 in the first direction and the second direction, and the touch panel 500 is disposed.

The panel 100 may be various types of panels such as a liquid crystal panel, an organic light emitting panel, or an electrophoretic display panel.

The panel 100 is formed by bonding a first substrate and a second substrate.

The first substrate and the second substrate may be manufactured using glass, plastic, metal, or the like.

When the display device according to the present invention is a liquid crystal display device, liquid crystal may be injected between the first substrate and the second substrate. When the display device according to the present invention is an organic light emitting display device, an organic compound for outputting light may be provided on the first substrate. When the display device according to the present invention is an electrophoretic display device, an electrophoretic dispersion liquid may be injected between the first substrate and the second substrate. Hereinafter, the present invention will be described by taking the case where the panel 100 is a liquid crystal panel as an example.

When the panel 100 is a liquid crystal panel, the panel 100 includes a first substrate having a color filter (CF substrate), a second substrate having a common electrode and a pixel electrode for each pixel (TFT substrate), and and a liquid crystal injected between the first substrate and the second substrate.

The second substrate includes the data lines DL1 to DLd, the gate lines GL1 to GLg crossing the data lines DL1 to DLd, and the pixels.

Each of the pixels 110 includes a switching transistor connected to the gate line and the data line, a pixel electrode connected to the switching transistor and receiving a data voltage from the data line through the switching transistor, and the pixel electrode; A common electrode for driving the liquid crystal filled in the pixel is also provided.

In the present invention, the common electrode is also used as the touch electrode.

Third, the panel driver includes a gate driver 200 for sequentially supplying gate pulses to the gate lines GL1 to GLg, and a data driver 200 for supplying a data voltage to the data lines DL1 to DLd. 300 ) and a control unit 400 for controlling functions of the gate driver 200 and the data driver 300 .

First, the controller 400 includes a gate control signal GCS for controlling the gate driver 200 using a vertical synchronization signal, a horizontal synchronization signal, and a clock supplied from an external system (not shown), and the data. A data control signal DCS for controlling the driver 300 is output.

In addition, the control unit 400 samples the input image data input from the external system, rearranges it, and supplies the rearranged digital image data to the data driver 300 .

Also, the control unit 400 may generate a touch control signal TCS for controlling the touch sensing unit 600 and transmit it to the touch sensing unit 600 .

The touch control signal TCS includes a touch synchronization signal TSS that distinguishes the image output period from the touch sensing period, and a common voltage control for supplying a common voltage to the touch panel 500 during the touch sensing period. signal (CCS).

The common voltage may be supplied to the touch panel 500 through the data driver 300 or a separate component constituting the touch sensing unit 800 or the panel driving unit.

When the touch sensing unit 600 supplies the common voltage to the touch panel 500 , the touch sensing unit 600 responds to the common voltage control signal CCS transmitted from the control unit 400 . , the common voltage may be supplied to the touch panel 500 .

Next, the data driver 300 converts the image data input from the controller 400 into the data voltage, and generates a data voltage corresponding to one horizontal line for each horizontal period in which the scan pulse is supplied to the gate line. supplied to the data lines. For example, the data driver 300 converts the image data into data voltages using gamma voltages supplied from a gamma voltage generator (not shown), and then outputs the data voltages to the data lines. .

Finally, the gate driver 200 sequentially supplies gate pulses to the gate lines GL1 to GLg of the panel 100 in response to the gate control signal input from the controller 400 . Accordingly, switching transistors formed in each pixel to which the gate pulse is input may be turned on, and an image may be output to each pixel.

The gate driver 200 is formed independently of the panel 100 and may be configured to be electrically connected to the panel 100 in various ways. However, the gate driver 200 is mounted in the panel 100 . It may be configured in a gate in panel (GIP) manner.

In the above description, the data driver 300 , the gate driver 200 , and the control unit 400 have been described as being independently configured, but at least one of the data driver 300 or the gate drivers 200 is It may be configured in the control unit 400 .

Fourth, the touch sensing unit 600 senses the presence or absence of a touch and a touch position in the touch panel 500 using sensing signals received from the touch panel 500 .

For example, the touch sensing unit 600 sequentially supplies the touch driving signal to the driving electrodes TX formed on the touch panel 500 and then passes through the receiving electrodes RX. Using the received sensing signals, it is possible to determine the presence or absence of a touch on the touch panel 500 and a touch position. When the user's finger touches the touch panel 500 , the sensing signal is induced by the touch driving signal and transmitted to the touch sensing unit 600 through the receiving electrodes RX.

To this end, the touch sensing unit 600 includes a touch driving unit 610 sequentially supplying the touch driving signal to the driving electrodes TX, a receiving unit 620 receiving the sensing signals, and a touch determining unit 630 . ) is included.

The touch determination unit 630 determines whether there is a touch on the touch panel 500 and a touch position. However, the touch determination unit 630 may only perform a function of converting the analog sensing signal received from the receiving electrodes RX into a digital signal. In this case, the presence or absence of the touch and the touch position may be determined by the controller 400 or a separate component.

The touch determination unit 630 includes the driving electrodes TX and the receiving electrodes RX in the image output period according to the touch synchronization signal TSS transmitted from the control unit 400 , A common voltage is supplied, and during the touch sensing period, the touch driving signal is supplied to the driving electrode TX, and the reference voltage is supplied to the receiving electrode RX.

In particular, when the touch sensing unit 600 supplies the common voltage to the touch panel 500 , the touch sensing unit 600 transmits the common voltage control signal CCS from the control unit 400 . Accordingly, after the touch driving signal is supplied to the touch panel 500 in the touch sensing period, a common voltage is supplied to the touch panel 500 during the image output period.

For example, as shown in FIG. 3 , the touch electrodes include driving electrodes TX to which a touch driving signal is supplied, and a receiving electrode for transmitting a sensing signal generated by the touch driving signal to the touch sensing unit ( RX), the touch sensing unit 600, after supplying the touch driving signal to the driving electrode TX in the touch sensing period, and during the image output period, The common voltage is supplied to the receiving electrode RX.

4 is an exemplary view illustrating the configuration of a touch driving unit among the touch sensing units applied to a display device with a touch panel according to the present invention, and FIG. 5 is a receiving unit applied to a display device equipped with a touch panel according to the present invention. It is an example diagram showing the configuration. As described above, the common voltage may be supplied to the touch panel 500 through the data driver 300 or a separate component constituting the touch sensing unit 800 or the panel driving unit. However, in the following, an example in which the touch sensing unit 800 transmits the common voltage to the touch panel 500 according to the common voltage control signal CCS and the touch synchronization signal TSS is the example of the present invention. It is described as an example.

In order to perform the above function, the touch sensing unit 600, the touch sensing unit, includes a plurality of switches SW, and each of the switches SW transmits the common voltage control signal ( CCS), the touch electrode is connected to a common voltage supply unit 710 for supplying the common voltage Vcom or a touch driving signal supply unit 720 for supplying the touch driving signal.

First, in order to perform the function as described above, the touch driving unit 610 constituting the touch sensing unit 600 includes a plurality of switchers SW, as shown in FIG. 4 .

Each of the switches SW is connected to the driving electrode line TL, the common voltage supply unit 710 and the touch driving signal supply unit 720 .

The driving electrode line TL is connected to the driving electrode TX.

The common voltage supply unit 710 supplies the common voltage.

The touch driving signal supply unit 720 transmits the touch driving signal to the driving electrode TX. The touch driving signal is sequentially supplied to the driving electrodes TX. In this case, a driving control signal (not shown) for sequentially supplying the touch driving signal to the driving electrodes TX may be transmitted to the switching unit SW.

For example, when the image output period arrives, the touch synchronization signal TSS indicating the image output period is supplied to the switching unit SW. In this case, the switching unit SW connects the common voltage supply unit 710 to the driving electrode line TL.

When the touch sensing period arrives, the touch synchronization signal TSS indicating the touch sensing period is supplied to the switching unit SW.

When it is a timing to supply the touch driving signal to the driving electrode TX connected to the driving electrode line TL, the switching unit SW performs the touch driving according to the driving control signal (not shown). The signal supply unit 720 is connected to the driving electrode line TL.

Accordingly, the touch driving signal supply unit 720 supplies the touch driving signal to the driving electrode TX through the switching unit SW and the driving electrode line TL.

When it is not a timing at which the reference voltage is supplied to the driving electrode TX connected to the driving electrode line TL, the switching unit SW is configured to control the touch driving signal supply unit 720 according to the driving control signal. ) is not connected to the driving electrode line TL.

In this case, the switching unit SW connects the reference voltage supply unit 730 illustrated in FIG. 5 to the driving electrode line TL. Accordingly, although not shown in FIG. 4 , the switching unit SW may be connected to the reference voltage supply unit 730 .

Accordingly, the reference voltage supply unit 730 supplies the reference voltage to the driving electrode TX through the switching unit SW and the driving electrode line TL.

The common voltage supply unit 710 , the touch driving signal supply unit 720 , and the reference voltage supply unit may be configured in the touch sensing unit 600 as shown in FIGS. 4 and 5 , but the touch sensing It may be configured independently of the unit 600 .

When the reference voltage is not supplied to the driving electrode TX connected to the driving electrode line TL, the driving electrode TX may be connected to a ground electrode.

Second, the receiving unit 610 constituting the touch sensing unit 600 includes a plurality of switchers SW, as shown in FIG. 5 .

Each of the switches SW is connected to the receiving electrode line RL, the common voltage supply unit 710 and the reference voltage supply unit 730 .

The receiving electrode line RL is connected to the receiving electrode RX.

The common voltage supply unit 710 supplies the common voltage.

The reference voltage supply unit 720 transmits the reference voltage to the driving electrode TX or the receiving electrode RX.

For example, when the image output period arrives, the touch synchronization signal TSS indicating the image output period is supplied to the switching unit SW. In this case, the switching unit SW connects the common voltage supply unit 710 to the receiving electrode line RXL.

When the touch sensing period arrives, the touch synchronization signal TSS indicating the touch sensing period is supplied to the switching unit SW.

In this case, the switching unit SW connects the reference voltage supply unit 730 to the receiving electrode line RX.

Accordingly, the reference voltage supply unit 730 supplies the reference voltage to the reception electrode RX through the switching unit SW and the reception electrode line RX.

6 is an exemplary diagram illustrating timing diagrams of various signals applied to a display device equipped with a touch panel according to the present invention, and in particular, signals applied to a display device equipped with a mutual touch panel. Hereinafter, a method of driving a display device equipped with a touch panel according to the present invention described with reference to FIGS. 2 to 5 will be described. In the following description, the same or similar contents to those described above are omitted or simply described.

First, when the touch sensing period T arrives by the touch synchronization signal TSS, the touch sensing unit 600 drives the touch with the touch panel 500 built in the panel 100 . A signal is supplied, and the presence or absence of a touch in the touch panel 500 is determined using a sensing signal received from the touch panel 500 .

For example, when the first touch sensing period T1 arrives, the touch driving unit 610 supplies the first touch driving signal Vd1 to the first touch electrode. When the second touch sensing period T2 arrives, the touch driving unit 610 supplies the second touch driving signal Vd2 to the second touch electrode.

In this case, the receiving unit 620 supplies the reference voltage Vref to the receiving electrodes.

In addition, the reference voltage Vref is supplied to the touch electrodes excluding the first touch electrode during the first touch sensing period T1.

The touch determination unit 630 may determine the presence or absence of a touch and a touch position on the touch panel 500 using the sensing signals received from the receiving electrodes RX.

Second, in the touch sensing period, after the touch driving signal is supplied to the touch panel, a common voltage is supplied to the touch panel during an image output period, and an image is output through the panel during the image output period .

For example, in the delay period Y from when the first touch driving signal Vd1 is output in the first touch sensing period T1 until the image output period arrives, the touch driver ( 610) and the receiving unit 620 supply the common voltage Vcom to the driving electrodes including the first driving electrode and the receiving electrodes.

In the delay period Y, even when the common voltage Vcom is supplied, the voltages of the driving electrodes and the receiving electrodes do not become the common voltage Vcom.

For example, in the delay period Y, voltages of the driving electrodes and the receiving electrodes gradually change from the reference voltage Vref or the touch driving signal Vd to the common voltage Vcom.

Third, when the image output period D arrives, voltages of the driving electrodes and the receiving electrodes become the common voltage Vcom.

In detail, before the image output period (D) arrives, in the delay period (Y), since the instability of the common voltage (Vcom) is improved, in the image output period (D), the common voltage ( Vcom) has a stable value.

Accordingly, in the entire period of the image output period D, a normal image is output from the panel 100 .

The present invention described above is summarized as follows.

The common voltage Vcom should be maintained at a constant DC voltage during the image output period. However, in the conventional display device, the common voltage Vcom supplied to the driving electrode and the receiving electrode during the image output period is at a normal level by the load of the driving electrode and the receiving electrode to a normal level. may not be supplied. Accordingly, horizontal lines may be generated on the panel.

The present invention is to prevent the delay of the common voltage Vcom as described above. To this end, in the present invention, immediately before the end of the touch sensing period, the common voltage Vcom is previously supplied to the driving electrode and the receiving electrode.

Accordingly, a stabilized DC common voltage may be supplied to the driving electrode and the receiving electrode during the image output period, and accordingly, the horizontal line defect may be improved.

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: panel 500: touch panel
200: gate driver 300: data driver
400: control unit 600: touch sensing unit
TX: driving electrode RX: receiving electrode
710: common voltage supply unit 720: touch driving signal supply unit
730: reference voltage supply

Claims (6)

a panel having a built-in touch panel including touch electrodes that are also used as common electrodes;
a panel driver for driving the panel so that the panel outputs an image during an image output period; and
a touch sensing unit that supplies a touch driving signal to the touch panel during a touch sensing period and determines whether there is a touch on the touch panel using a sensing signal received from the touch panel;
The panel driver,
A display device with a touch panel for controlling to supply a common voltage to the touch panel during the image output period after the touch driving signal is supplied to the touch panel in the touch sensing period. delete The method of claim 1,
wherein the touch sensing unit supplies the common voltage to the touch panel according to a common voltage control signal transmitted from the panel driver. 4. The method of claim 3,
The touch sensing unit includes a plurality of switchers,
Each of the switches connects the touch electrode to a common voltage supply unit for supplying the common voltage or a touch driving signal supply unit for supplying the touch driving signal according to the common voltage control signal, a display provided with a touch panel Device. The method of claim 1,
The touch electrodes include driving electrodes to which a touch driving signal is supplied and receiving electrodes for transmitting a sensing signal generated by the touch driving signal to the touch sensing unit,
The touch sensing unit supplies the common voltage to the driving electrode and the receiving electrode during the image output period after supplying the touch driving signal to the driving electrode in the touch sensing period. Device. supplying a touch driving signal to a touch panel built in the panel during a touch sensing period, and determining whether or not there is a touch in the touch panel using the sensing signal received from the touch panel; and
and supplying a common voltage to the touch panel during an image output period after the touch driving signal is supplied to the touch panel in the touch sensing period,
and an image is output through the panel during the image output period.

Images