KR20170126560A - Display Device Having Touch Sensor - Google Patents

Abstract

A touch sensor built-in type display device according to the present invention includes a display panel, a display panel drive circuit portion, and a touch drive circuit portion. In the display panel, touch sensors arranged in the pixel array and sensing lines connected to the touch sensors are arranged, and are driven in a time division manner in a pixel driving period and a touch driving period. The display panel drive circuit section writes the image data to the pixels of the pixel array. The touch driving circuit unit supplies a touch block driving signal, which is an AC waveform, to the touch sensors through the sensing lines, and determines a touch input based on the amount of charge change of the touch sensors sensed through the sensing lines. The touch driving driving circuit sequentially generates the first to k-th (k is a natural number) touch block driving signals for sequentially driving the first to k-th touch blocks during the touch driving period of each frame. The k-th touch block driving signal outputted during the k-th touch period is controlled such that the swing width of the AC signal output in the k-th touch period is smaller than the swing width of the AC signal output during the k-th touch period.

Description

[0001] The present invention relates to a display device having a built-in touch sensor,

The present invention relates to a touch sensor built-in display device.

In recent years, there has been a demand for display devices that can be enlarged in size, cost is low, and display quality (video expression power, resolution, brightness, contrast ratio, color reproduction power, etc.) A flat display device (or a display device) has been actively developed. In these flat display devices, various input devices such as a keyboard, a mouse, a trackball, a joystick, and a digitizer are used to configure an interface between a user and a display device. However, the use of the above-described input device requires the user to learn how to use it, inconveniences such as occupying an installation and operation space, and it is difficult to improve the completeness of the product. Accordingly, there is a growing demand for an input device for a display device that is convenient and simple and can reduce malfunctions. In response to such a request, a touch sensor has been proposed that allows a user to directly touch the screen with a hand or a pen or the like while looking at the display device, and to recognize information when the information is input.

2. Description of the Related Art In recent years, touch sensors have been adopted in portable information devices such as smart phones, and are being widely applied to notebook computers, computer monitors, and home appliances. 2. Description of the Related Art In recent years, a technology (hereinafter referred to as "In-cell touch sensor") in which touch sensors are embedded in a pixel array of a display panel is widely used. Incelel touch sensor technology can install touch sensors on the display panel without increasing the thickness of the display panel. These touch sensors are connected to the pixels through parasitic capacitance and signal lines (hereinafter referred to as "pixel signal lines"). The driving method includes a period for driving pixels (hereinafter referred to as a " pixel driving period ") and a period for driving the touch sensors (hereinafter referred to as" touch ") for reducing mutual influences due to coupling of pixels and touch sensors, Quot; driving period ").

Since the display devices in which the touch sensor is incorporated operate in a time-division manner between the pixel driving period and the touch driving period, the touch driving must be performed for a very short period of time. Therefore, it is very important to improve the sensitivity of touch sensing.

Further, side effects may occur in the process of increasing the sensitivity of the touch sensing, and a technique capable of reducing such side effects is required.

The present invention provides a touch sensing display device capable of reducing power consumption while enhancing touch sensing sensitivity.

In order to achieve the above object, a touch sensor built-in type display device according to the present invention includes a display panel, a display panel driving circuit, and a touch driving circuit. In the display panel, touch sensors arranged in the pixel array and sensing lines connected to the touch sensors are arranged, and are driven in a time division manner in a pixel driving period and a touch driving period. The display panel drive circuit section writes the image data to the pixels of the pixel array. The touch driving circuit unit supplies a touch block driving signal, which is an AC waveform, to the touch sensors through the sensing lines, and determines a touch input based on the amount of charge change of the touch sensors sensed through the sensing lines. The touch driving driving circuit sequentially generates the first to k-th (k is a natural number) touch block driving signals for sequentially driving the first to k-th touch blocks during the touch driving period of each frame. The k-th touch block driving signal outputted during the k-th touch period is controlled such that the swing width of the AC signal output in the k-th touch period is smaller than the swing width of the AC signal output during the k-th touch period.

Since the touch blocks are arranged in the horizontal direction and touch driving is performed in units of touch blocks, the sensing voltages obtained in the same period are substantially delayed by the length deviation of the sensing lines. That is, the present invention can improve the sensing sensitivity because the occurrence of the sensing voltage deviation due to the RC delay in the touch driving period can be improved.

When the AC signal of the same phase is applied to the touch block driving signal and the data lines and the gate lines of the display panel, the parasitic capacitance between the touch sensors and the signal lines can be minimized, so that the touch sensing sensitivity can be increased.

At the same time, the k (k is a natural number) touch block driving signal can reduce the voltage swing width of the AC signal except the k touch period, thereby reducing power consumption.

In addition, since the voltage swing width of the k-th touch block driving signal VCOM_Bk according to the present invention is smaller than the k-touch period except the k-touch period, EMI is reduced compared with the touch block driving signal swinging Can

1 is a view showing a touch sensor built-in display device according to the present invention.
2 is a view illustrating an arrangement of touch sensors according to an embodiment of the present invention.
3 is an enlarged view of a part of the display panel shown in Fig.
Fig. 4 is a diagram showing driving timings according to the present invention. Fig.
5 and 6 are diagrams showing the configuration of a drive signal generating section.
7 is a timing chart of the touch block driving signals outputted from the driving signal generating unit.
8 is a diagram showing a sensing circuit section.
9 is a diagram showing a first channel multiplexer of the sensing circuit section.
10 is a view showing a sensing unit.
11 is a diagram showing a touch block driving signal and an AC signal applied to the signal lines.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description, a detailed description of known technologies or configurations related to the present invention will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured. In addition, the component names used in the following description may be selected in consideration of easiness of specification, and may be different from the parts names of actual products.

1 is a view showing a touch sensor built-in display device according to the present invention. FIG. 2 is a view showing an embodiment of a display panel, and FIG. 3 is an enlarged view of a part of the display panel. 4 is a diagram showing a touch synchronous signal, a mux control signal, and a driving timing. In FIGS. 3 and 4, each touch sensor and sensing line is marked with a separate reference numeral. However, in the detailed description, the touch sensor TC and the sensing line CH .

1 to 4, a touch sensor built-in type display device according to the present invention includes a display panel 100, a host system 105, a timing controller 110, display panel drive circuit portions 120 and 130, and touch drive circuit portions 200, ). The display panel driving circuit units 120 and 130 include a data driving unit 120 and a gate driving unit 130. The touch driving circuit units 200, 300 and 400 include a touch driving signal generating unit 200, a sensing circuit unit 300, and an MCU 400 .

The display panel 100 includes a pixel array to which the touch sensors TC are coupled. The display panel 100 may include a plurality of touch blocks, for example, first to seventh touch blocks BLOCK1 to BLOCK7 as shown in FIG.

The pixel array of the display panel 100 includes a thin film formed at the intersections of the data lines DL1 to DLm, the gate lines GL1 to GLn, the data lines DL1 to DLm and the gate lines GL1 to GLn. A pixel electrode 5 connected to the thin film transistor TFT, and a storage capacitor Cst connected to the pixel electrode 5, and the like. The thin film transistor TFT is turned on in response to a gate pulse from the gate lines GL1 to GLn to supply a data voltage applied to the pixel electrode 5 through the data lines DL1 to DLm. The liquid crystal layer LC is driven by a voltage difference between a data voltage charged in the pixel electrode 5 and a common voltage Vcom applied to the touch common electrode 7 to control the amount of light transmitted.

The touch sensor TC is connected to a plurality of pixels and is implemented as a capacitance type to sense a touch input. The display panel 100 includes a first touch group TG1 and a second touch group TG2 and the first touch group TG1 and the second touch group TG2 include 210 touch sensors TC . In FIG. 2, the first to 210th touch sensors belonging to the first touch group TG1 are indicated as "1" to "210", and 210 touch sensors TCs belonging to the second touch group TG2 It is also indicated by numbers only.

The first touch block BLOCK1 includes 30 touch sensors TC1 to TC30 belonging to the first touch group TG1 and 30 touch sensors TC1 to TC30 belonging to the second touch group TG2.

Similarly, each of the second to fourth touch blocks BLOCK2 to BLOCK7 includes 30 touch sensors TC31 to TC60 belonging to the first touch group TG1 and 30 touch sensors TC31 to TC60 belonging to the second touch group TG2, And touch sensors TC31 to TC60.

A plurality of pixels P are coupled to each touch sensor TC. FIG. 3 shows a case where nine pixels P arranged in a 3x3 matrix are assigned to one touch sensor TC. The common electrode 7 is divided into units of touch sensors TC so that the area occupied by the common electrode 7 can be referred to as a touch sensor TC. Each of the touch sensors TC is connected to the sensing lines CH one by one. For example, a sensing line (CH1) of one row and one column is connected to the touch sensor (TC1) of one row and one column, and a sensing line (CH2) of one row and two columns is connected to the touch sensor (TC2) of one row and two columns. The first channel group CG1 includes sensing lines CH connected to the touch sensors TC1, TC11, TC21, ..., TC201 arranged in the first column TC_C1, the tenth channel group CG10, Includes sensing lines CH connected to the touch sensors TC10, TC20, TC30, ..., TC210 arranged in the tenth column TC_C10.

The common electrode 7 receives the common voltage Vcom, which is a reference voltage of the pixels during the display period, and receives the touch driving signal during the touch sensing period. The touch driving signal of the present invention includes touch block driving signals for touch sensing the display panel 100 on a block basis. In each of the touch block driving signals, the swing width of the voltage is changed during a period other than the touch period and the touch period. A detailed description of the touch block driving signal will be described later.

The display panel 100 according to the embodiment of the present invention displays an image through the pixels P during the pixel driving period Td and drives the touch sensors TC during the touch sensing period Tt Detection.

The touch driving period Tt includes first to seventh touch periods Tt1 to Tt7, and each touch period drives one touch block BLOCK. For example, the first touch period Tt1 drives the touch sensors TC1 * 2 through TC30 * 2 included in the first touch block BOLCK1, the seventh touch period Tt7 drives the seventh touch block BLOCK7, The touch sensors TC181 * 2 to TC210 *

The host system 105 may be implemented as any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 105 converts the digital video data RGB of the input image into a format suitable for display on the display panel 100, including a system on chip (SoC) with a built-in scaler. The host system 105 transmits timing signals (Vsync, Hsync, DE, MCLK) to the timing controller 110 together with the digital video data. In addition, the host system 105 receives coordinate data (Txy) of the touch data from the MCU 400 and executes an application program associated with the coordinate data.

The timing controller 110 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 105 And synchronizes the operation timings of the data driver 120 and the gate driver 130 with each other. The timing controller 110 also outputs a gate timing control signal and a data timing control signal. The gate timing control signal includes a gate start pulse (GSP), a gate shift clock, a gate output enable signal (GOE), and the like. The data timing control signal includes a source sampling clock (SSC) and a source output enable (SOE) signal.

The data driver 120 receives the image data RGB from the timing controller and converts the image data into a positive / negative gamma compensation voltage to output a positive / negative data voltage. The data voltage is supplied to the data lines DL1 to DLm.

The gate driver 130 sequentially supplies gate pulses to the gate lines GL1 to GLn under the control of the timing controller. The gate pulse output from the gate driver is synchronized with the data voltage. The gate driver may be formed on the lower substrate of the display panel 100 together with the pixel array in a gate in panel (GIP) process.

The touch driving circuit units 200, 300 and 400 supply a touch block driving signal having an AC waveform to the touch sensors TC through the sensing lines CH and change a charge variation amount of the touch sensors TC sensed through the sensing lines CH The touch input is judged based on the background. To this end, the touch driving circuit units 200, 300, and 400 include a touch driving signal generating unit 200, a sensing circuit unit 300, and an MCU 400.

The touch driving signal generator 200 generates a touch block driving signal and provides the touch block driving signal to the sensing circuit unit 300.

5 is a block diagram showing a configuration of a touch driving signal generating unit. 6 is a diagram illustrating an embodiment of a first drive signal generator, a second drive signal generator, and a first touch drive signal selector. 7 is a timing chart of the touch block driving signal outputted from the touch driving signal generating unit.

5 to 7, the touch driving signal generating unit 200 includes a first driving signal generating unit 211, a second driving signal generating unit 212, and first to seventh touch driving signal selecting units 221 To 227).

An input terminal of the first driving signal generator 211 receives the first high voltage VH1 and the first low voltage VL1 and receives a pulse width control signal PWM. The first drive signal generating unit 211 outputs the first high voltage VH1 when the pulse width control signal PWM is at the high level and outputs the first low voltage VH1 when the pulse width control signal PWM is at the low level VL1. As a result, the first driving signal generating unit 211 generates the first driving signal VCOM1 that swings from the first high voltage VH1 to the first low voltage VL1 with the same cycle as the pulse width control signal PWM, .

The first high voltage VH1 and the first low voltage VL1 may be generated in the touch driving signal generating unit 200 or may be generated in a separate power supply unit. The pulse width control signal PWM is input from the timing controller 110.

An input terminal of the second driving signal generator 212 receives the second high voltage VH2 and the second low voltage VL2, and the selection terminal receives the pulse width control signal PWM. The second driving signal generating section 212 outputs the second high voltage VH2 when the pulse width control signal PWM is at the high level and outputs the second low voltage VH2 when the pulse width control signal PWM is at the low level VL2. The second driving signal generator 212 generates the second driving signal VCOM2 that swings from the second high voltage VH2 to the second low voltage VL2 with the same cycle as the pulse width control signal PWM, . The second high voltage VH2 is a voltage level lower than the first high voltage VH1 and the secondlow voltage VL2 is a voltage level higher than the first low voltage VL1.

The second high voltage VH2 and the second low voltage VL2 may be generated in the touch driving signal generating unit 200 or may be generated in a separate power supply unit.

An input terminal of the first touch driving signal selector 221 receives the first driving signal VCOM1 and the second driving signal VCOM2 and receives a first mux control signal MUX1. The first touch driving signal selector 221 outputs the first driving signal VCOM1 when the first mux control signal MUX1 is at the high level and the second driving signal VCOM1 when the first mux control signal MUX1 is at the low level, And outputs the drive signal VCOM2. As a result, the first touch block driving signal VCOM_B1 output from the first touch driving signal selector 221 is at the first high voltage VH1 while the first mux control signal MUX1 is at the high level, Swings to the voltage VL1 and swings from the second high voltage VH2 to the second low voltage VL2 while the first mux control signal MUX1 is low level.

In this manner, the second touch block driving signal VCOM_B2 output from the second touch driving signal selecting unit 222 is a first touch block driving signal VCOM_B2, which is the first touch block driving signal VCOM_B2, Swings to the low voltage VL1 and swings from the second high voltage VH2 to the second low voltage VL2 while the second mux control signal MUX2 is at the low level.

Similarly, the seventh touch block driving signal VCOM_B7 outputted from the seventh touch driving signal selecting unit 227 is a first touch block driving signal VCOM_B7 from the first high voltage VH1 to the first low voltage VH1 while the seventh mux control signal MUX7 is at the high level VL1 and swings from the second high voltage VH2 to the second low voltage VL2 while the seventh mux control signal MUX7 is at the low level.

The sensing circuit unit 300 drives the touch sensor TC using the touch block driving signal VCOM_B. The sensing circuit unit 300 receives a sensing voltage that varies according to the capacitance variation of the touch sensors TC, converts the sensing voltage into touch data Tdata, which is digital data, and transmits the sensing data to the MCU 400. As shown in FIG. 2, in a display panel in which twenty touch sensors TC are disposed in the lateral direction and 21 are arranged in the column direction, the first sensing circuit unit 301 and the second sensing circuit unit 302 are used, (TC) are driven as follows.

8 is a diagram showing a configuration of a sensing circuit section.

Referring to FIG. 8, the sensing circuit unit 300 includes a first sensing circuit unit 301 and a second sensing circuit unit 302. The first sensing circuit unit 301 drives the touch sensors TC belonging to the first touch group TG1 and the second sensing circuit unit 302 drives the touch sensors TC belonging to the second touch group TG2 do. The configurations of the first and second sensing circuit units 301 and 302 may be substantially the same. Hereinafter, the first sensing circuit unit 301 will be mainly described herein.

The first sensing circuit unit 301 includes first through thirty channel circuit units 301 # 1, 301 # 2, 301 # 3 ... 301 # 30, a channel multiplexer 320 and an analog- do. Each of the channel circuit units 301 # 1, 301 # 2, 301 # 3 ... 301 # 30 can be implemented with the same configuration. Hereinafter, "# " And one reference numeral is denoted.

Each channel circuit section 310 includes a channel multiplexer 311, a sensing unit 312, an integrator 313 and a holder 314.

The channel multiplexer 311 is implemented as a 7: 1 multiplexer, and the input channels are connected to seven touch sensors TC included in the first to fourth touch blocks BLOCK1 to BLOCK7, respectively. The channel multiplexer 311 may be connected to the touch sensors TC arranged in the same column as the same row in the first to fourth touch blocks BLOCK1 to BLOCK7.

9 is a view showing an embodiment of the first channel multiplexer 311 # 1 and Table 1 is a table showing sensing lines CH selected by the mux control signals MUX1 to MUX7.

MUX1 MUX2 MUX3 MUX4 MUX5 MUX6 MUX7 CH1 ○ CH31 ○ CH61 ○ CH91 ○ CH121 ○ CH151 ○ CH181 ○

Referring to FIG. 9 and Table 1, the input terminals of the first channel multiplexer 311 # 1 according to the embodiment include a first sensing line CH1, a 31st sensing line CH31, a 61st sensing line CH61 The 91st sensing line CH91, the 151st sensing line CH151, and the 181st sensing line CH181. The input terminal of the first channel multiplexer 311 # 1 receives any one of the first to seventh mux control signals MUX1 to MUX7.

The first channel multiplexer 311 # 1 outputs the sensing voltage of the first sensing line CH1 in response to the first mux control signal MUX1 and outputs the sensing voltage of the third sensing line CH1 in response to the second mux control signal MUX2. (CH31). Then, in response to the seventh mux control signal MUX7, the sensing voltage of the 181st sensing line CH181 is output.

In this manner, the channel multiplexer 311 # 2 of the second channel circuit unit 311 # 2 responds to the first to Mux control signals MUX1 to MUX7, , The 32nd sensing line CH32, the 62nd sensing line CH62, the 92nd sensing line CH92, the 122nd sensing line CH122, the 152th sensing line CH152 and the 182nd sensing line CH182 And sequentially outputs the voltage.

As a result, the first to thirtieth channel circuit units 310 # 1 to 310 # 30 of the first sensing circuit unit 301 respond to the first mux control signal MUX1 to generate the first touch block BLCOK1 1 to thirtieth touch sensors TC1 to TC30. The first to thirtieth channel circuit units 310 # 1 to 310 # 30 then sense the touch sensors TC31 to TC60 belonging to the second touch block BLOCK2 in response to the second mux control signal MUX2. And acquires the sensing voltage of the touch sensors TC61 to TC90 belonging to the third touch block BLCOK3 in response to the third mux control signal MUC3. The sensing voltage of the touch sensors TC91 to TC120 belonging to the fourth touch block BLOCK4 to the sensing voltage of the seventh touch block BLCO7 The touch sensors TC181 to TC210 belonging to the touch sensor group are sequentially acquired.

Since the touch blocks BLOCK are arranged in parallel with the sensing circuit unit 300, the sensing line CH connecting the touch sensors TC and the sensing circuit unit 300 belonging to the same touch block BLOCK has a length deviation . As described above, in the embodiment of the present invention, the touch blocks BLCOK are arranged in the horizontal direction and touch driving is performed in units of touch blocks. Therefore, the sensing voltages Vsen acquired in the same time period are subjected to the length deviation There is almost no delay caused by the delay. That is, according to the present invention, it is possible to improve the sensing sensitivity because the occurrence of the sensing voltage (Vsen) deviation due to the RC delay in the touch driving period (Tt) can be improved.

The sensing unit 312 receives the sensing voltage input via the channel mux 311 and amplifies and outputs the sensing voltage.

Fig. 10 is a diagram showing the sensing unit 312. Fig.

10, the sensing unit 312 includes an inverting input terminal - for receiving a sensing voltage Vsen from the sensing line CH and a non-inverting input terminal +2 for receiving a touch block driving signal VCOM_B. And a feedback capacitor Cf connected between the inverting input terminal (-) and the output terminal (Vout). The feedback capacitor Cf integrates the sensing voltage input through the inverting input terminal (-). The reset switch RST is turned on at regular intervals to reset the amount of charge stored in the feedback capacitor Cf.

The touch block driving signal VCOM_B is supplied to the data lines DL and the gate lines GL while the touch block driving signals VCOM_B of the AC waveform are supplied to the sensing unit 312. [ And an AC signal (Vac) having the same phase as that of the AC signal (Vac). When the AC signal Vac having the same phase as the touch block driving signal VCOM_B is applied to the data lines DL and the gate lines GL of the display panel 100, the voltage difference across the parasitic capacitance is reduced. As a result, the amount of charge of the parasitic capacitance generated in the display panel 100 can be reduced. That is, when the AC signal Vac having the same phase is applied to the touch block driving signal VCOM_B1 and the data lines DL and the gate lines GL of the display panel 100, The parasitic capacitance between the gate lines GL and GL can be minimized, and the touch sensing sensitivity can be increased.

Particularly, the k-th touch block drive signal VCOM_Bk (k is a natural number of 7 or less) is set such that the swing width of the AC signal output during the k-th touch period is smaller than the swing width of the AC signal output during the k- Respectively. That is, the k-th touch block driving signal VCOM_Bk can increase the voltage swing width during the driving period of the k-th touch block BLOCKk to increase the capacitance change of the touch sensors TC. As a result, the k-th touch block driving signal VCOM_Bk can increase the touch sensing sensitivity during the k-touch period.

At the same time, the k-th touch block driving signal VCOM_Bk decreases the voltage swing width of the AC signal in the k-touch period, thereby reducing power consumption.

When the k-th touch block driving signal VCOM_Bk swings, Electro Magnetic Interference (hereinafter referred to as EMI) occurs at the inflection point where the slope of the voltage changes. At this time, EMI caused by the kth touch block driving signal VCOM_Bk is proportional to the swing width of the voltage. Since the voltage swing width of the k-th touch block driving signal VCOM_Bk is smaller than the k-touch period except the k-touch period, the EMI can be reduced compared with the touch block driving signal swinging in a wide range .

The integrator 313 of the channel circuit portion 310 integrates the output of the sensing unit 312. [

The holder 314 samples the voltage output by the integrator 313 at predetermined time intervals and outputs the sampled analog voltage.

The touch multiplexer 320 receives analog voltages output from the holders 314 # 1 to 314 # 30 of the first to thirtieth channel circuit units 310 # 1 to 310 # 30 and sequentially outputs the analog voltages. To this end, the touch multiplexer 320 may be implemented as a 30: 1 multiplexer having input terminals connected to the output terminals of the first to thirtieth channel circuit units 310 # 1 to 310 # 30.

The analog-to-digital converter 330 generates touch data (Tdata) obtained by converting an analog voltage output from the touch multiplexer 320 into a digital data value.

The MCU 400 receives the touch data Tdata output from the analog-to-digital converter 330 of the sensing circuit unit 300 and executes a preset touch recognition algorithm. Any known algorithm for the touch recognition algorithm is possible. The touch recognition algorithm compares the touch primitive data input from the sensing circuit unit 300 with a predetermined threshold value, and determines that the touch primitive data exceeding the threshold value is the touch input data obtained from the touch sensors at the touch input position. The touch recognition algorithm assigns an identification code to each of the touch input data of a threshold value or more and calculates coordinates of each of the touch input positions. The MCU 400 transmits the identification code and the touch coordinate information Txy of each of the touch input data to the host system 105. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the present invention should not be limited to the details described in the detailed description, but should be defined by the claims.

5: pixel electrode 7: common electrode
TC: Touch sensor CH: Sensing line
105: Host 110: Timing controller
120: Data driver 130: Gate driver
200: drive signal generator 300: sensing circuit
400: MCU

Claims (9)

A display panel in which touch sensors arranged in a pixel array and sensing lines connected to the touch sensors are arranged and driven in a time division manner in a pixel driving period and a touch driving period;
A display panel driving circuit for writing image data to pixels of the pixel array; And
And a touch driving circuit for supplying a touch block driving signal having an AC waveform to the touch sensors through the sensing lines and determining a touch input based on the amount of charge change of the touch sensors sensed through the sensing lines,
The touch driving circuit unit sequentially generates the first through k-th touch block driving signals by generating first through k-th (k is a natural number) touch block driving signals during the touch driving period of each frame,
Wherein the k-th touch block driving signal outputted during the k-th touch period is a touch sensor built-in display in which the swing width of the AC signal output in the k-th touch period is controlled to be smaller than the swing width of the AC signal output during the k- Device. The method according to claim 1,
The k < th > touch block drive signal
And swings from a second high voltage lower than the first high voltage to a second low voltage higher than the first low voltage except for the k-th touch period. The method according to claim 1,
The touch driving circuit unit includes a touch driving signal generating unit for generating first to k-th touch block driving signals,
The touch driving signal generating unit
A first driving signal generator for generating a first touch driving signal swinging from a first high voltage to a first low voltage;
A second driving signal generator for generating a second touch driving signal swinging from the second high voltage to the second row voltage; And
And a kth touch driving signal selector for outputting the kth touch block driving signal in response to the kth mux control signal received during the kth touch period. The method of claim 3,
Wherein the driving signal generating unit includes a first touch block driving signal selecting unit and a kth touch block driving signal selecting unit,
The k-th touch block driving signal selecting unit and the k-th touch block driving signal selecting unit select the first to k-th touch block driving signals to the k-th touch block driving signal selecting unit in response to sequentially- The display device including a touch sensor. The method according to claim 1,
Wherein the data line and the gate lines disposed on the display panel are supplied with an AC signal having the same phase as the touch block driving signal during the touch driving period. The method according to claim 1,
The sensing circuit section
And a sensing unit for outputting a sensing voltage. The display device of claim 1, wherein the sensing unit comprises: a sensing unit for sensing the touch block; a non-inverting input terminal for receiving the touch block driving signal; The method according to claim 1,
The sensing circuit section
Further comprising a k: 1 channel multiplexer coupled to k touch sensors included in the first touch block to the k touch block,
The channel multiplexer
And sequentially receives the sensing voltages of the k touch sensors included in the first to k-th touch blocks in response to sequentially applied first to k-th mux control signals. 8. The method of claim 7,
The touch blocks include j (j is a natural number) touch sensors,
Wherein the sensing circuit unit includes j channel circuit units for simultaneously receiving sensing voltages of the j touch sensors. 9. The method of claim 8,
Wherein the touch sensors connected to the respective channel circuit portions are arranged in the same column in the display panel.

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