KR20200050650A - Touch Device And Method Of Driving The Same - Google Patents

Abstract

Provided are a touch display device capable of preventing a malfunction of a gate driving unit, and a method of driving the same. According to the present invention, the touch display device includes: a timing control unit for generating a touch synchronization signal, image data, a data control signal, and a gate control signal; a microcontroller unit for generating a selection signal by using the touch synchronization signal; a touch power supply unit for modulating a common voltage and a gate low voltage according to the selection signal to generate a modulated common voltage and a modulated gate low voltage, respectively; a data driving unit for generating a data voltage by using the image data and the data control signal; a gate driving unit configured to generate a modulated gate voltage by using the gate control signal and the modulated gate low voltage, and including a bypass capacitor connected to an input terminal of the modulated gate row voltage during a display period and blocked from the input terminal of the modulated gate row voltage during a touch period; and a touch display panel for displaying an image by using the data voltage and the modulated gate voltage during the display period, and detecting a touch by using the modulated common voltage during the touch period.

Description

Touch display device and its driving method {Touch Device And Method Of Driving The Same}

The present invention relates to a touch display device, and in particular, by switching the connection of the bypass capacitor in the display section and the touch section, the malfunction is minimized in the display section and the power consumption is reduced in the touch section and the touch display device and its driving method will be.

In accordance with the information age, the display field has also rapidly developed, and in response, a liquid crystal display device (LCD) as a flat panel display device (FPD) having advantages of thinning, lightening, and low power consumption. ), Plasma display panel device (PDP), organic light emitting diode display device (OLED), field emission display device (FED), etc. It is rapidly replacing the cathode ray tube (CRT).

Recently, a touch display device (or touch screen) having a touch panel attached to such a display panel has been spotlighted.

The touch display device is used as an output means for displaying an image, and is used as an input means for receiving a user's command by touching a specific portion of the displayed image, and the touch panel of the touch display device according to the location information detection method It can be divided into a decompression method, an electrostatic method, an infrared method, and an ultrasonic method.

That is, when the user touches the touch panel while viewing the image displayed on the display panel, the touch panel can detect the location information of the corresponding part and compare the detected location information with the location information of the image to recognize the user's command.

Such a touch display device may be manufactured in a form in which a separate touch panel is attached to the display panel, or the touch panel is formed on a substrate of the display panel to be integrated.

In particular, in recent years, for the slimming of portable terminals such as smart phones and tablet PCs, electrodes and wires constituting a touch panel are formed on a substrate of a display panel to integrate the in-cell type touch display device. Demand is increasing.

The in-cell type touch display device may display an image by supplying a common voltage to the common wiring during the display period, and detect a touch by applying a modulated common voltage as a touch signal to the common wiring during the touch period.

Here, during the touch section, a plurality of pulse-shaped modulation common voltages are applied to the common wiring. In order to minimize delay and signal distortion due to parasitic capacitance between the common wiring and the gate wiring, the modulation gate voltage corresponding to the modulation common voltage It is applied to this gate wiring.

The gate voltage is generated using a constant voltage type gate low voltage, and the modulation gate voltage is generated using a plurality of pulse type modulation gate low voltages. Instead of the constant voltage type gate low voltage, a plurality of pulse type modulation gate low voltages are used. When it is input to the gate driving unit, a malfunction occurs in the level shifter of the gate driving unit, which causes a problem in the gate clock generation logic.

In order to prevent this, when a capacitor is connected to the input terminal of the modulating gate low voltage, the effect of improving signal delay and signal distortion in the touch section is reduced and power consumption is increased.

The present invention has been proposed to solve this problem, and by connecting the bypass capacitor to the modulation gate voltage input terminal of the gate driver through the switch during the display period, malfunction of the gate driver is prevented and defect generation of the gate clock generation logic is prevented. It is an object to provide a touch display device and a driving method thereof.

The present invention provides a touch display device and a driving method for improving signal delay and signal distortion and reducing power consumption by blocking a connection between a bypass capacitor and a modulation gate voltage input terminal of a gate driver through a switch during a touch period. To provide for other purposes.

In order to solve the above problems, the present invention, a timing control unit for generating a touch synchronization signal, image data, data control signal and gate control signal; A microcontroller unit for generating a selection signal using the touch synchronization signal; A touch power supply unit that modulates a common voltage and a gate low voltage according to the selection signal to generate a modulation common voltage and a modulation gate low voltage, respectively; A data driving unit that generates a data voltage using the image data and the data control signal; By using the gate control signal and the modulation gate voltage to generate a modulation gate voltage, and connected to the input terminal of the modulation gate voltage during the display period and the bypass capacitor blocked from the input terminal of the modulation gate voltage during the touch period A gate driver including; It provides a touch display device including a touch display panel for displaying an image using the data voltage and the modulation gate voltage during the display period, and detecting a touch using the modulation common voltage during the touch period.

The gate driving unit may further include a switch connected between the input terminal of the modulation gate row voltage and the bypass capacitor, and turned on during the display period and turned off during the touch period.

Further, the switch may be turned on or off according to the touch synchronization signal.

In addition, the selection signal has a constant voltage form during the display section, a plurality of pulse forms during the touch section, and the modulation common voltage and the modulation gate low voltage are the common voltage and the gate, respectively, during the display section. It may have a constant voltage form corresponding to the low voltage and a plurality of pulse forms corresponding to the selection signal during the touch period.

In addition, the touch display panel may include a gate wiring and a data wiring defining pixels by intersecting each other; A thin film transistor connected to the gate wiring and the data wiring; The touch wiring may be connected to a common electrode of a touch block including a plurality of pixels.

Further, during the display period, a gate-touch capacitor between the gate wiring and the touch wiring, a gate-source capacitor between the gate wiring and the source electrode of the thin film transistor, and a drain electrode of the gate wiring and the thin film transistor. The input capacitance of the gate wiring is maximized by the sum of the gate-drain capacitor between, the gate-common capacitor between the gate wiring and the common electrode, and the bypass capacitor, and during the touch period, the gate-touch The input capacitance of the gate wiring can be minimized by the capacitor, the gate-source capacitor, the gate-drain capacitor, and the gate-common capacitor.

In addition, the touch power supply unit may supply the modulation common voltage to the data driving unit, and the data driving unit may supply the modulation common voltage to the touch wiring to detect a touch.

In addition, the touch display device may further include a power management unit that supplies the common voltage and the gate low voltage to the touch power unit.

On the other hand, the present invention, the timing control unit generating a touch synchronization signal, image data, data control signal and gate control signal; A microcontroller unit generating a selection signal using the touch synchronization signal; Generating a modulated common voltage and a modulated gate voltage by modulating a common voltage and a gate low voltage according to the selection signal by the touch power supply unit; A data driving unit generating a data voltage using the image data and the data control signal; A gate driving unit connecting a bypass capacitor to an input terminal of the modulation gate low voltage during a display period, and blocking the bypass capacitor from an input terminal of the modulation gate low voltage during a touch period; A gate driving unit generating a modulation gate voltage using the gate control signal and the modulation gate low voltage; And a touch display panel displaying an image using the data voltage and the modulation gate voltage during the display period, and detecting a touch using the modulation common voltage during the touch period. Gives

The step of the gate driving unit connecting a bypass capacitor to the input terminal of the modulation gate row voltage during the display period, and blocking the bypass capacitor from the input terminal of the modulation gate row voltage during the touch period includes the touch synchronization signal. Turning on a switch connected between the input terminal of the modulation gate row voltage and the bypass capacitor during the display period; And turning off the switch during the touch period according to the touch synchronization signal.

The present invention has an effect of preventing malfunction of the gate driving unit and preventing occurrence of defects in the gate clock generation logic by connecting the bypass capacitor to the modulation gate voltage input terminal of the gate driving unit through the switch during the display period.

In addition, the present invention has an effect of improving signal delay and signal distortion and reducing power consumption by blocking the connection of the bypass capacitor and the modulation gate voltage input terminal of the gate driver through the switch during the touch period.

1 is a view showing a touch display device according to an embodiment of the present invention.
2 is a view showing a gate driver of a touch display device according to an exemplary embodiment of the present invention.
3 is a diagram illustrating one pixel of a touch display device according to an exemplary embodiment of the present invention.
4 is a waveform diagram showing a plurality of signals of a touch display device according to an exemplary embodiment of the present invention.

Hereinafter, a touch display device and a driving method thereof according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a touch display device according to an embodiment of the present invention.

As shown in FIG. 1, the touch display device 110 according to the exemplary embodiment of the present invention includes a timing control unit 120, a microcontroller unit 125, a power management unit 130, a touch power unit 135, and a data driving unit 140, a gate driving unit 145 and a touch display panel 160, the touch display 110 is an organic light emitting diode display device (OLED display device) or a liquid crystal display (liquid) crystal display device: LCD device).

The touch display device 110 according to an embodiment of the present invention is driven by dividing one frame (F of FIG. 4) into a display section (DP of FIG. 4) and a touch section (TP of FIG. 4). During DP), an image is provided by supplying a modulation gate voltage and a common modulation voltage (VCOMM) including a data voltage and a modulation gate low voltage (VGLM) to the data wiring DL, the gate wiring GL, and the touch wiring TL, respectively. Display, and supplies a modulation common voltage (VCOMM) to the touch wiring TL during the touch period TP to sense the touch.

Here, during the display period DP, a data voltage is applied to the pixel electrode (not shown) of the pixel P through the thin film transistor of the pixel P, and a modulation gate of a constant voltage type corresponding to the gate low voltage VGL A modulation gate voltage including a low voltage (VGLM) and a sequential pulse-type gate high voltage is applied to the gate electrode of the thin film transistor of the pixel P through the gate wiring GL, and a constant voltage-type modulation common voltage (VCOMM) ) Is applied to the touch electrode (common electrode) through the touch wiring TL to display an image.

Then, during the touch period TP, a plurality of pulsed modulation common voltages VCOMM, which are touch signals, are applied to the touch electrodes (common electrodes) through the touch wiring TL, and correspond to the modulation common voltages VCOMM. By supplying a modulation gate voltage including a plurality of pulsed modulation gate row voltages (VGLM) to the gate wiring GL, the parasitic capacitance between the touch wiring TL and the gate wiring GL is reduced and the touch wiring TL ) Can be minimized, and as a result, touch sensitivity can be improved.

The timing control unit 120 includes a video signal IS and a data enable signal DE, a horizontal sync signal HSY, a vertical sync signal VSY, and a clock CLK transmitted from an external system such as a graphic card or a TV system. ) Using a plurality of timing signals such as a touch synchronization signal (TSY), image data (RGB), data control signal (DCS) and gate control signal (GCS) is generated, the generated touch synchronization signal (TSY) is a micro Transfer to the controller unit 125, the generated image data (RGB) and data control signal (DCS) is transferred to the data driving unit 140, the generated gate control signal (GCS) is transferred to the gate driving unit 145 .

The microcontroller unit 125 generates a pulse width modulation (PWM) using the touch synchronization signal TSY and transmits the generated selection signal SEL to the touch power supply unit 135.

For example, the microcontroller unit 125 is a computer in which a microprocessor and an input / output module are made of one chip to perform a predetermined function, and a central processing unit (CPU), memory, and programmable input / output It may include.

The power management unit 130 generates the common voltage VCOM and the gate low voltage VGL, and transmits the generated common voltage VCOM and the gate low voltage VGL to the touch power unit 135.

For example, the power management unit 130 may be a power management integrated circuit (PMIC) that generates and outputs a plurality of power voltages.

The touch power unit 135 generates the modulation common voltage VCOMM and the modulation gate low voltage VGLM from the common voltage VCOM and the gate low voltage VGL according to the selection signal SEL, and the generated modulation common voltage (VCOMM) is transferred to the data driving unit 140, and the generated modulation gate low voltage VGLM is transferred to the gate driving unit 145.

Although not shown, the touch power supply unit 135 may include a mux input unit and a mux unit, and the mux input unit is required for generating a modulation common voltage (VCOMM) and a modulation gate low voltage (VGLM) according to a selection signal (SEL). The MUX input voltage is generated and transferred to the MUX unit, and the MUX unit selects one of the common voltage (VCOM), the gate low voltage (VGL), and the multiple MUX input voltage according to the selection signal (SEL), and modulates the common voltage (VCOMM). , It is possible to generate and output a modulated gate low voltage (VGLM).

For example, the touch power unit 135 may be a touch power integrated circuit (TPIC) that generates and outputs multiple modulation voltages.

The data driving unit 140 generates a data voltage (data signal) using the data control signal DCS and the image data RGB transmitted from the timing control unit 120 and touches the generated data voltage to the touch display panel 160 ) Is applied to the pixel electrode (not shown) of each pixel P through the data wiring DL and the thin film transistor (not shown).

Then, the data driving unit 140 applies the modulation common voltage VCOMM transmitted from the touch power unit 135 to the common electrode (not shown) through the touch wiring TL of the touch display panel 160.

In addition, the data driving unit 140 may calculate a change in the self-capacitance of the common electrode by analyzing the falling time of the modulation common voltage (VCOMM), and as a result, detect the touch. Can be.

The modulated common voltage VCOMM may have a constant voltage form corresponding to the common voltage VCOM in the display section (DP in FIG. 4), and may have a plurality of pulse forms in the touch section (TP in FIG. 4).

The gate driving unit 145 generates a modulation gate voltage (modulated gate signal) using the gate control signal GCS transmitted from the timing control unit 120 and the modulation gate low voltage VGLM transmitted from the touch power unit 135. Then, the generated modulation gate voltage is applied to the gate electrode of the thin film transistor of each pixel P through the gate wiring GL of the touch display panel 160.

The modulation gate voltage may have a sequential pulse shape corresponding to the gate high voltage in the display period DP, and may have a plurality of pulse shapes corresponding to the modulation common voltage VCOMM in the touch period TP.

The gate driving unit 145 is a gate-in-panel formed on a substrate of the display panel 160 on which the gate wiring GL, the data wiring DL, the touch wiring TL, and the pixel P are formed. in panel: GIP).

The gate-in-panel-type gate driving unit 145 includes a level shifter (147 in FIG. 2) for changing the voltage level and a shift register for generating a voltage in a sequential pulse form ( 149 in FIG. 2).

The touch display panel 160 displays an image using a modulation gate voltage, a data voltage, and a modulation common voltage (VCOMM), and senses a touch using the modulation common voltage (VCOMM). To the common electrode of the touch block consisting of the gate wiring GL and the data wiring DL defining the pixel P connected to the gate wiring GL and the data wiring DL, and a plurality of pixels P It includes a touch wiring (TL) to be connected.

When the touch display device 110 is an organic light emitting diode display device, the pixel P of the touch display panel 160 may include a switching thin film transistor, a driving thin film transistor, a storage capacitor, and a light emitting diode, and the touch display device 110 ) Is a liquid crystal display, the pixel P of the touch display panel 160 may include a thin film transistor, a storage capacitor, and a liquid crystal capacitor.

The touch display device 110 prevents malfunction of the gate driving unit 145 by connecting a bypass capacitor (Cbp of FIG. 2) to the input terminal of the modulation gate voltage VGLM during the display section DP. And, during the touch period TP, the bypass capacitor Cbp is cut off from the input terminal of the modulation gate row voltage VGLM to reduce power consumption, which will be described with reference to the drawings.

2 is a diagram illustrating a gate driving unit of a touch display device according to an exemplary embodiment of the present invention, and will be described with reference to FIG. 1.

As shown in FIG. 2, the gate driving unit 145 of the touch display device 110 according to an embodiment of the present invention includes a level shifter 147 for changing a voltage level and a sequential pulse form. It includes a shift register (149) for generating a voltage, a switch (SW) and a bypass capacitor (Cbp) in series between the input terminal and the ground terminal of the modulation gate low voltage (VGLM) of the level shifter 147 Leads to

The level shifter 147 may change the voltage level of the gate high voltage supplied from the power management unit 130 and the modulation gate low voltage VGLM supplied from the touch power supply unit 135 and supply the voltage to the shift register 149.

The shift register 149 generates a modulation gate voltage using the gate control signal GCS supplied from the timing control unit 120 and the gate high voltage and the modulation gate low voltage VGLM supplied from the level shifter 147 and , The generated modulation gate voltage can be supplied to the gate wiring GL.

Here, the bypass capacitor Cbp is connected to the input terminal of the modulation gate row voltage VGLM of the level shifter 147 during the display period (DP in FIG. 4) according to the on / off operation of the switch SW, During the touch period (TP of FIG. 4), the level shifter 147 is blocked from the input terminal of the modulation gate row voltage VGLM.

That is, the switch SW is turned on during the display period DP, and turned off during the touch period TP, for example, the switch SW is displayed It may be turned on and off according to the touch synchronization signal TSY of the timing controller 120 having a high level during the period DP and a low level during the touch period TP.

As described above, in the touch display device 110 according to the embodiment of the present invention, the bypass capacitor (VGLM) input terminal of the level shifter 147 of the level shifter 147 of the gate driving unit 145 during the display period DP By connecting Cbp), malfunction of the level shifter 147 due to alternating current components such as a plurality of pulse shapes and defects in the gate clock generation logic can be prevented.

And, by blocking the bypass capacitor (Cbp) from the input terminal of the modulation gate low voltage (VGLM) of the level shifter 147 of the gate driver 145 during the touch period TP, the delay of the modulation gate voltage VGLM is prevented. By maintaining the signal distortion improvement effect of the modulation common voltage (VCOMM), it is possible to reduce power consumption.

Meanwhile, the common electrode of each touch block of the touch display device 110 according to the embodiment of the present invention has a plurality of parasitic capacitances, which will be described with reference to the drawings.

3 is a diagram illustrating one pixel of a touch display device according to an exemplary embodiment of the present invention. For convenience, a liquid crystal display panel will be described with reference to FIGS. 1 and 2 together.

As illustrated in FIG. 3, one pixel P of the touch display device 110 according to an embodiment of the present invention includes a thin film transistor Tr connected to the gate wiring GL and the data wiring DL. , A storage capacitor Cst and a liquid crystal capacitor Clc connected to the thin film transistor Tr.

Specifically, the gate electrode of the thin film transistor Tr is connected to the gate wiring GL, the source electrode of the thin film transistor Tr is connected to the data wiring DL, and the drain electrode of the thin film transistor Tr is a storage capacitor. One electrode of (Cst) and one electrode of the liquid crystal capacitor (Clc) may be connected.

The other electrode of the storage capacitor Cst and the other electrode of the liquid crystal capacitor Clc are connected to the touch wiring TL, and FIG. 3 shows the touch wiring TL connected to the common electrode of another touch block. .

In the pixel P, a plurality of parasitic capacitances are formed between a plurality of electrodes and a plurality of wirings.

For example, a gate-source capacitor Cgs is formed between the gate electrode and the source electrode of the thin film transistor Tr, and a gate-drain capacitor Cgd is formed between the gate electrode and the drain electrode of the thin film transistor Tr. Can be.

In addition, a gate-touch capacitor Cgt may be formed between the gate wiring GL and the touch wiring TL, and a gate-common capacitor Cgc may be formed between the gate wiring GL and the common electrode.

In addition, a data-touch capacitor Cdt is formed between the data wiring DL and the touch wiring TL, and a data-pixel capacitor Cdp is formed between the data wiring DL and the pixel electrode, and the data wiring ( DL) and a common electrode, a data-common capacitor Cdc may be formed, and a touch-common capacitor Ctc may be formed between the touch wiring TL and the common electrode.

In such a pixel P, the parasitic capacitance connected to the common electrode of one touch block used as a touch electrode for touch sensing is different from the parasitic capacitance connected to the touch wiring TL connected to the common electrode of the touch block. , It can be divided into parasitic capacitance connected to the common electrode of the touch block.

The parasitic capacitance connected to the touch wiring TL connected to the common electrode of the corresponding touch block includes a touch-common capacitor Ctc and a data wiring DL between the corresponding touch wiring TL and a common electrode of a different touch block. And a data-touch capacitor Cdt between the corresponding touch wiring TL and a gate-touch capacitor Cgt between the gate wiring GL and the corresponding touch wiring TL, wherein the touch-common capacitor ( Ctc), the data-touch capacitor Cdt, and the gate-touch capacitor Cgt may be connected to the corresponding touch wiring TL in parallel with each other. (Ctc + Cdt + Cgt)

The parasitic capacitance connected to the common electrode of the corresponding touch block includes a data-common capacitor (Cdc) between the data wiring (DL) and the common electrode, and a gate-common capacitor (Cgc) between the gate wiring (GL) and the common electrode. ), A touch-common capacitor (Ctc) between the touch wiring (TL) connected to the pixel electrode of a different touch block and a corresponding common electrode, and a gate-drain connected in series to the storage capacitor (Cst) and the storage capacitor (Cst). It may include a capacitor (Cgd), a storage capacitor (Cst) between the common electrode and the pixel electrode and a data-pixel capacitor (Cdp) connected in series to the storage capacitor (Cst), data-common capacitor (Cdc), gate -Common capacitor (Cgc), touch-common capacitor (Ctc) and storage capacitor (Cst) can be connected to each other in parallel to the corresponding common electrode. (Cdc + Cgc + Ctc + (Cst∥Cgd) + (Cst∥Cdp))

Meanwhile, the parasitic capacitance connected to the gate wiring GL may include a gate-touch capacitor Cgt, a gate-source capacitor Cgs, a gate-drain capacitor Cgd, and a gate-common capacitor Cgc. (Cgt + Cgs + Cgd + Cgc)

In the touch display device 110 according to the exemplary embodiment of the present invention, the switch SW is turned on during the remaining period except for the section in which the gate high voltage of the display section (DP in FIG. 4) is applied, and the bypass capacitor ( Cbp) is connected to the gate wiring GL, and a modulation gate row voltage VGLM in the form of a constant voltage corresponding to the gate low voltage VGL is supplied to the gate wiring GL, and parasitics connected in parallel to the gate wiring GL. Input of the gate wiring GL by the sum of the gate-touch capacitor Cgt, the gate-source capacitor Cgs, the gate-drain capacitor Cgd, and the gate-common capacitor Cgc and the bypass capacitor Cbp. The capacitance is maximized, the high frequency component of the modulating gate voltage (VGLM) is removed, the modulation gate voltage (VGLM) is stabilized, the malfunction of the shift register 147 of the gate driving unit 145 is prevented, and the gate clock generation logic Bad Is prevented.

In addition, during the touch period (TP in FIG. 4), the switch SW is turned off, thereby bypassing the bypass capacitor Cbp from the gate wiring GL and in the form of a plurality of pulses corresponding to the modulation common voltage VCOMM. The modulation gate row voltage VGLM is supplied to the gate wiring GL, and the gate-touch capacitor Cgt, the gate-source capacitor Cgs, and the gate-drain capacitor Cgd, which are parasitic capacitances connected in parallel to the gate wiring GL. ) And the gate-common capacitor (Cgc) minimizes the input capacitance of the gate wiring (GL), minimizes the delay of the modulation gate low voltage (VGLM), and distorts the modulation common voltage (VCOMM) used as a touch signal. It is minimized and power consumption is reduced.

For example, when the bypass capacitor Cbp is connected to the gate wiring GL, the rising time and falling time of the modulation common voltage VCOMM are about 2.2 μsec, respectively, whereas the gate wiring ( When the bypass capacitor (Cbp) is blocked from GL), the rising time and falling time of the modulation common voltage (VCOMM) are about 1.2 μsec, respectively, minimizing signal distortion and improving touch sensitivity. Can be.

4 is a waveform diagram showing a plurality of signals of a touch display device according to an exemplary embodiment of the present invention, and will be described with reference to FIGS. 1 to 3.

As illustrated in FIG. 4, the touch synchronization signal TSY generated by the timing controller 120 has a first high potential voltage V1H during the display period DP and a first classic during the touch period TP. It has a first low potential voltage (V1L) less than the potential voltage (V1H).

The selection signal SEL generated by the microcontroller unit 125 has the second low potential voltage V2L during the display period DP, and the second low potential voltage V2L and the second during the touch period TP. It has a plurality of pulse shapes that vary between the second high potential voltage V2H greater than the low potential voltage V2L.

The modulation common voltage VCOMM generated by the touch power unit 135 has a third medium potential voltage V3M that is a common voltage VCOM during the display section DP, and a third medium potential voltage during the touch interval TP. It has a number of pulse shapes that vary between the third low potential voltage (V3L) less than (V3M) and the third high potential voltage (V3H) greater than the third medium potential voltage (V3M).

The modulated gate low voltage VGLM generated by the touch power unit 135 has a fourth low potential voltage V4L that is the gate low voltage VGL during the display period DP and a fourth low during the touch period TP. It has a plurality of pulse shapes that vary between the potential voltage V4L and the fourth high potential voltage V4H greater than the fourth low potential voltage V4L.

As described above, in the touch display device 110 according to the embodiment of the present invention, the microcontroller unit 125 generates a selection signal SEL using the touch synchronization signal TSY, and during the touch period TP In response to the selection signal SEL, the touch power unit 135 generates a plurality of pulsed modulation common voltages VCOMM and modulation gate voltages VGLM, and touches the selection signal SEL during the display section DP. The power supply unit 135 generates a modulation common voltage (VCOMM) and a modulation gate low voltage (VGLM) in the form of a constant voltage.

Here, the switch SW is turned on according to the touch synchronization signal TSY of the first high potential voltage V1H during the display period DP so that the bypass capacitor Cbp is the input terminal of the modulating gate voltage VGLM. Is connected, and as a result, the modulation gate low voltage (VGLM) is stabilized, malfunction of the shift register 147 of the gate driving unit 145 is prevented, and defects in the gate clock generation logic are prevented.

In addition, during the touch period TP, the switch SW is turned off according to the touch synchronization signal TSY of the first low potential voltage V1L, so that the bypass capacitor Cbp is the input terminal of the modulation gate voltage VGLM. Is blocked, and as a result, delay of the modulation gate low voltage (VGLM) is minimized, distortion of the modulation common voltage (VCOMM) used as a touch signal is minimized, and power consumption is reduced.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

110: touch display device 120: timing control unit
125: microcontroller unit 130: power management unit
135: touch power supply unit 145: gate driving unit
140: data driving unit 160: touch display panel

Claims (10)

A timing control unit generating a touch synchronization signal, image data, data control signal and gate control signal;
A microcontroller unit for generating a selection signal using the touch synchronization signal;
A touch power supply unit that modulates a common voltage and a gate low voltage according to the selection signal to generate a modulation common voltage and a modulation gate low voltage, respectively;
A data driving unit that generates a data voltage using the image data and the data control signal;
A bypass capacitor is generated by using the gate control signal and the modulation gate voltage to be connected to the input terminal of the modulation gate voltage during the display period and blocked from the input terminal of the modulation gate voltage during the touch period. A gate driver including;
A touch display panel that displays an image using the data voltage and the modulation gate voltage during the display period, and detects a touch using the modulation common voltage during the touch period.
Touch display device comprising a.
According to claim 1,
The gate driving unit, a touch display device further comprises a switch that is connected between the input terminal of the modulation gate row voltage and the bypass capacitor, and is turned on during the display period and turned off during the touch period.
According to claim 2,
The switch is a touch display device that is turned on or off according to the touch synchronization signal.
According to claim 1,
The selection signal has a constant voltage shape during the display period, and a plurality of pulse shapes during the touch period,
The modulated common voltage and the modulated gate low voltage each have a constant voltage shape corresponding to the common voltage and the gate low voltage during the display period, and a touch having a plurality of pulse shapes corresponding to the selection signal during the touch period. Display device.
According to claim 1,
The touch display panel,
A gate wiring and a data wiring defining a pixel crossing each other;
A thin film transistor connected to the gate wiring and the data wiring;
Touch wiring connected to a common electrode of a touch block including a plurality of the pixels
Touch display device comprising a.
The method of claim 5,
During the display period, a gate-touch capacitor between the gate wiring and the touch wiring, a gate-source capacitor between the gate wiring and the source electrode of the thin film transistor, and a drain electrode between the gate wiring and the thin film transistor. The input capacitance of the gate wiring is maximized by the sum of the gate-drain capacitor, the gate-common capacitor between the gate wiring and the common electrode, and the bypass capacitor,
During the touch period, a touch display device in which the input capacitance of the gate wiring is minimized by the gate-touch capacitor, the gate-source capacitor, the gate-drain capacitor, and the gate-common capacitor.
According to claim 1,
The touch power supply unit supplies the modulation common voltage to the data driving unit,
The data driving unit detects a touch by supplying the modulated common voltage to the touch wiring.
According to claim 1,
And a power management unit supplying the common voltage and the gate low voltage to the touch power unit.
A timing control unit generating a touch synchronization signal, image data, data control signal and gate control signal;
A microcontroller unit generating a selection signal using the touch synchronization signal;
Generating a modulated common voltage and a modulated gate voltage by modulating a common voltage and a gate low voltage according to the selection signal by the touch power supply unit;
A data driving unit generating a data voltage using the image data and the data control signal;
A gate driving unit connecting a bypass capacitor to an input terminal of the modulation gate low voltage during a display period, and blocking the bypass capacitor from an input terminal of the modulation gate low voltage during a touch period;
A gate driving unit generating a modulation gate voltage using the gate control signal and the modulation gate low voltage;
A touch display panel displaying an image using the data voltage and the modulation gate voltage during the display period, and detecting a touch using the modulation common voltage during the touch period.
Method of driving a touch display device comprising a.
The method of claim 9,
The step of the gate driving unit, connecting a bypass capacitor to the input terminal of the modulation gate row voltage during the display period, and blocking the bypass capacitor from the input terminal of the modulation gate row voltage during the touch period,
Turning on a switch connected between the input terminal of the modulation gate row voltage and the bypass capacitor during the display period according to the touch synchronization signal;
Turning off the switch during the touch period according to the touch synchronization signal
Method of driving a touch display device comprising a.

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