KR20150080164A - Touch panel dispaly device - Google Patents

Abstract

According to an embodiment of the present invention, the present invention can provide a touch panel display device including a touch sensing unit, which can prevent coupling noise by blocking application of common voltages on a driving electrode, which is not used for touch sensing, among driving electrodes even when capacitance between two lines is generated as a line for supplying driving voltages (TX CLK) is overlapped with a line for supplying common voltages. According to an embodiment of the present invention, the touch panel display device includes: the driving electrode which alternately repeats a display period and a touch sensing period during a one frame in multiple times and applies driving voltages; and a reception electrode which senses a touch signal. The touch panel display device includes a touch sensing unit. The touch sensing unit includes a plurality of control signal output devices and the driving electrodes which correspond to each control signal output device one to one. Each control signal output device outputs common voltages to the driving electrode in the display period. If one of the control signal output devices outputs driving voltages in the touch sensing period, common voltage supply of rest of the control signal output devices is blocked.

Description

{TOUCH PANEL DISPALY DEVICE}

The present invention relates to a touch panel display device.

The liquid crystal display displays an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, a liquid crystal display device includes a liquid crystal panel in which pixels are arranged in a matrix form, and a driving circuit for driving the liquid crystal panel.

On the other hand, as a method of inputting a control signal to an electronic product equipped with a liquid crystal display device, there are a method using a touch panel and a method using a button, but recently, a method using a touch panel has been widely used.

That is, the liquid crystal display device to which the touch panel is attached is applied to various kinds of electronic products such as navigation, industrial terminal, tablet PC, smart phone, financial automation device, game machine and the like, Its application is expanding due to its advantages.

1 is a diagram illustrating an example of a conventional method of driving a touch panel. FIG. 2 is a diagram illustrating various types of liquid crystal display devices provided with a touch panel, in which the touch panel shown in FIG. 2A is an on-cell type, the touch panel shown in FIG. ) Is a hybrid type. In Fig. 2, reference numeral 31 denotes a TFT substrate, 32 denotes a color filter substrate, 33 denotes a liquid crystal layer, and 34 denotes a cover glass.

The touch panel 40 is for sensing a touch from a user, and may be configured in various forms such as a resistive type, a capacitive type, and the like. However, in the following, a touch panel using a capacitive method is described.

The touch panel 40 includes a driving electrode 11 for applying a driving voltage and a receiving electrode 21 for receiving a sensing signal generated by a driving voltage.

The touch sensing device 60 includes a driving voltage generating unit 61 for applying a driving voltage to the driving electrode 11 and a sensing signal receiving unit 62 for sensing whether or not the sensing signal is received using the sensing signal received through the receiving electrode, .

The touch panel 40 may be configured in various forms according to its arrangement position.

First, the touch panel 40 may be configured to be attached to the upper surface of the color filter substrate 32 (on cell type) as shown in FIG. 2 (a)

2 (b), the touch panel 40 has a structure in which one of the two electrodes 11 and 21 constituting the touch panel 40 is connected to the TFT substrate 31 of the liquid crystal display device, And the other is formed on the upper surface of the color filter substrate 32 (in-cell type).

3, the touch panel 40 includes two electrodes 11 and 21 constituting the touch panel 40, as shown in FIG. 2 (c). The two electrodes 11 and 21 constitute the TFT substrate 31 constituting the liquid crystal display (Hybrid type) formed on the same layer. The two electrodes 11 and 21 applied to the hybrid type touch panel are respectively driven to the driving electrode and the receiving electrode during the touch sensing period. However, during the video output period, both of the two electrodes are driven to the common electrode receiving the common voltage.

FIG. 3 is a block diagram of a conventional touch sensing apparatus 60, and FIG. 4 is a diagram illustrating operation timing of a conventional touch sensing apparatus 60. Referring to FIG.

3 and 4, during the touch period, the touch sensing apparatus 60 outputs the driving voltage TX CLK to the driving electrode 11, and the common voltage Vcom ) Signal.

The touch sensing device 60 applied to such a conventional touch panel has the following problems.

When the common voltage Vcom signal is applied to the (N-1) th driving electrode 11 and the driving voltage TX CLK is applied to the (N-1) th driving electrode 11, .

When the wiring for the driving voltage (TX CLK) and the wiring for the common voltage (Vcom) overlap with each other, a capacitance is formed between them, and as the driving voltage (TXCLK) changes with time, A coupling noise is generated because the potential difference between the common signal line (TXCLK) and the common voltage (Vcom) continuously changes.

This noise component affects the touch performance, and when the overlapping of the wiring for the driving voltage (TX CLK) and the wiring for the common voltage (Vcom) is avoided, there is a problem that the bezel becomes large.

A touch panel display device according to an embodiment of the present invention provides a touch panel display device that prevents a coupling noise phenomenon of a common voltage according to a change in driving voltage.

Also, the touch panel display device according to the embodiment of the present invention provides a touch panel display device that prevents the common voltage noise while maintaining the narrow bezel.

A touch panel display device according to an exemplary embodiment of the present invention includes a touch panel display including a display electrode and a touch sensing period for alternately repeating a display period and a touch sensing period for one frame, Wherein the touch panel display device includes a touch sensing unit, the touch sensing unit includes a plurality of control signal output units and driving electrodes corresponding to the control signal output units on a one-to-one basis, When a control voltage of one of the control signal generators outputs a driving voltage during the touch sensing period, the supply of the common voltage of the remaining control signal generators is interrupted A touch panel display.

The first control signal output device among the control signal output devices of the touch panel display device according to the embodiment of the present invention operates by a start signal and the control signal output device of the next stage operates in synchronization with the output signal of the control signal output device of the previous stage A touch panel display device.

The control signal output units of the touch panel display according to the exemplary embodiment of the present invention receive a high logic clock signal, a high logic first control signal, and a low logic second control signal to output a driving voltage to the driving electrode A clock signal of a low logic, a first control signal of a low logic, and a second control signal of a high logic to output a common voltage to the driving electrode, and outputs a low logic clock signal, a high logic first control signal, And applies a second control signal of logic to cut off a common voltage supplied to the driving electrode.

Each of the control signal output devices of the touch panel display device according to the embodiment of the present invention includes first and second switches, a driving voltage is supplied to the driving electrode when the first switch is turned on, The common voltage is supplied to the driving electrode at the time of turning on the first switch, the first switch is turned off in the display period, the second switch is turned on, and the control signal output from any one of the control signal output devices The first switch is turned on, the second switch is turned off, and the first and second switches are both turned off.

And a timing controller for supplying the clock signal and the first and second control signals of the touch panel display device according to the embodiment of the present invention.

The common voltage supplied to the driving electrode during the display period of the touch panel display device according to the exemplary embodiment of the present invention is used as a common electrode for applying a common voltage to the liquid crystal panel.

A method of driving a touch panel display according to an exemplary embodiment of the present invention includes repeating a display period and a touch sensing period several times alternately for one frame and includes a driving electrode for applying a touch driving voltage and a receiving electrode for sensing a touch signal A common voltage is applied to the driving electrode during the display period, a driving voltage is supplied to any one of the driving electrodes during the touch sensing period, and a common voltage supplied to the remaining driving electrodes Wherein the touch panel display device is interrupted.

The driving method of a touch panel display device according to an exemplary embodiment of the present invention is characterized in that the supply of the driving voltage to the driving electrode is interrupted during the display period and the common voltage is supplied and during the touch sensing period, Wherein driving voltage is supplied to the driving electrode, supply of the common voltage is cut off, and supply of the driving voltage and the common voltage to the remaining driving electrodes is cut off.

The touch sensing unit according to the embodiment of the present invention uses the touch sense among the driving electrodes even if the wiring for supplying the driving voltage TX CLK and the wiring for supplying the common voltage Vcom are wrapped to form a capacitance between both wirings It is possible to provide a touch panel display device capable of blocking the coupling noise by blocking the application of the common voltage to the driving electrodes which are not driven.

1 is a diagram illustrating an example of a conventional method of driving a touch panel.
2 is an exemplary view showing various types of liquid crystal display devices provided with a touch panel.
2 (a) is a view showing an on-cell type touch panel.
2B is a view showing an in-cell type touch panel.
Fig. 2 (c) shows a hybrid type touch panel. Fig.
3 is a block diagram of a conventional touch sensing apparatus.
FIG. 4 is a timing chart illustrating operation timings of a conventional touch sensing apparatus. Referring to FIG.
5 and 6 are block diagrams of a touch panel display apparatus according to an embodiment of the present invention.
7 is a block diagram of a touch sensing unit according to an embodiment of the present invention.
8 is a view showing a drive timing diagram of the touch sensing unit.

Hereinafter, a touch panel display device according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

The display device of the present invention may be applied to a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting display (OLED) OLED, electrophoresis (EPD), and the like. In the following embodiments, a display device is described as a liquid crystal display device as an example of a flat panel display device, but it should be noted that the display device of the present invention is not limited to a liquid crystal display device.

5 and 6 are block diagrams of a touch panel display apparatus according to an embodiment of the present invention.

A touch panel display device 300 according to an embodiment of the present invention will be described with reference to FIG.

The touch panel display device 300 according to the embodiment of the present invention includes a driving electrode 110 for applying a driving voltage TX CLK, The touch panel display device 300 includes a touch sensing unit 900 and the touch sensing unit 900 includes a plurality of control signal output units And the control signal output units 200 are connected in common to the driving electrodes 110 during the display period, and the control signal output units 200 may include driving electrodes 110 corresponding to the control signal output units 200 on a one- And a common voltage Vcom of the other control signal output units when the control signal output unit of the control signal output units 200 outputs the driving voltage TX CLK during the touch sensing period. Characterized in that the supply of The control signal output units 200 receive the clock signal CLK1 or CLK2 of high logic, the first control signal CS1 of the high logic and the second control signal CS2 of the low logic, A clock signal CLK1 or CLK2 of a low logic, a first control signal CS1 of a low logic and a second control signal CS2 of a high logic, The common voltage Vcom is outputted to the driving electrode 100 and the low logic clock signal CLK1 or CLK2, the high logic first control signal CS1 and the low logic second control signal CS2 are applied And the common voltage Vcom supplied to the driving electrode 110 is cut off.

The touch panel display device 300 according to the embodiment of the present invention includes a liquid crystal panel 400, a gate driver 500 for applying a scan signal to gate lines of the liquid crystal panel, A timing controller 700 for controlling the data driver 600 and the gate driver 500, a common voltage generator 800 for applying a common voltage to the driving electrodes, A driving voltage generator 100 for applying a voltage to a driving electrode and a touch sensing unit 900 for sensing a touch by processing a sensing signal received from a receiving electrode of a touch panel by applying a driving voltage to a driving electrode of the touch panel ). ≪ / RTI >

First, in the liquid crystal panel 400, a liquid crystal layer is formed between two substrates. A plurality of gate lines GL1 to GLn and n are a natural number) intersecting the data lines DL1 to DLm and m are natural numbers and the data lines DL1 to DLm are formed on the lower substrate of the liquid crystal panel 400, A plurality of thin film transistors (TFTs) formed at intersections of the data lines DL1 to DLm and the gate lines GL1 to GLn, a plurality of pixel electrodes for charging data voltages to the liquid crystal cells, And storage capacitors connected to the electrodes to maintain the voltage of the liquid crystal cell.

The pixels of the liquid crystal panel 400 are formed in a pixel region defined by the data lines DL1 to DLm and the gate lines GL1 to GLn and arranged in a matrix form. The liquid crystal cells of each of the pixels are driven by an electric field applied in accordance with a voltage difference between a data voltage applied to the pixel electrode and a common voltage applied to the common electrode to control the amount of incident light.

The TFTs are turned on in response to gate pulses from the gate lines GL1 to GLn to supply a voltage from the data lines DL1 to DLm to the pixel electrodes of the liquid crystal cell.

A backlight unit may be disposed on the back surface of the liquid crystal panel 400.

The backlight unit is implemented as an edge type or direct type backlight unit, and irradiates light to the display panel DIS.

The liquid crystal panel 400 may be implemented in any known liquid crystal mode such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode.

The timing controller 700 receives timing signals such as a data enable signal DE and a dot clock signal CLK from an external system and controls the operation timings of the data driver 600 and the gate driver 500 Gate and data control signals (GCS, DCS).

The gate control signal GCS is inputted to a shift register in the gate driver 500, a gate start pulse (GST) indicating a start horizontal line at which a scan starts in one vertical period in which one screen is displayed, A gate shift clock signal GSC for sequentially shifting the pulse GSP and a gate output enable signal GOE for controlling the output of the gate driver 500.

The data control signal DCS is based on a Source Start Pulse (SSP), a Rising or a Falling edge indicating a start point of data in one horizontal period in which data for one horizontal line is displayed A source sampling clock (SSC) for controlling the latch operation of the data, a source output enable signal SOE for controlling the output of the data driver 600, and a clock signal CLK to be supplied to the liquid crystal cells of the liquid crystal panel 400 A polarity control signal POL for controlling the polarity of the data voltage, and the like.

The timing controller 700 rearranges the input image data input from the external system and outputs the rearranged image data to the data driver 600.

The timing controller 700 controls the data driver 600 and the gate driver 500 and generates touch sensing unit control signals for controlling the input / output operation timing of the touch sensing unit 900, And may control the sensing unit 900.

Next, the data driver 700 converts the image data input from the timing controller into analog data voltages, and supplies data voltages of one horizontal line to the data lines in each horizontal period in which the scan signals are supplied to the gate lines.

That is, the data driver 600 converts the image data into a data voltage using the gamma voltages supplied from the gamma voltage generator (not shown), and outputs the data voltage to the data line.

That is, the data driver 600 generates a sampling signal by shifting a source start pulse (SSP) from the timing controller 700 according to a source shift clock (SSC). The data driver 600 latches the pixel data RGB (image data) input according to the source shift clock SSC according to the sampling signal, changes the data voltage to a data voltage, (SOE) signal to the data lines in units of horizontal lines.

To this end, the data driver 600 may include a data sampling unit, a latch unit, a digital-analog converter, and an output buffer.

Next, the gate driver 500 shifts a gate start pulse (GSP) transmitted from the timing controller 700 according to a gate shift clock (GSC), sequentially shifts the gate lines GL1 to GLn On voltage Von to the gate electrode of the scan driver. The gate driver 500 supplies the gate-off voltage Voff to the gate lines GL1 to GLn during the remaining period when the scan signal of the gate-on voltage Von is not supplied.

Meanwhile, the gate driver 500 according to the present invention may be configured to be independent from the panel and be electrically connected to the panel in various ways. However, the gate driver 500 may be a gate panel : GIP) method.

In this case, the gate control signal for controlling the gate driver 500 may be a start signal VST and a gate clock GCLK.

Next, the common voltage generator 800 generates a common voltage to be supplied to the driving electrode 110 for video output.

The common voltage generated by the common voltage generator 800 is supplied to the driving electrode through the touch sensing unit 900.

Next, the driving voltage generator 100 generates a driving voltage to be supplied to the driving electrode 110 for touch sensing.

The driving voltage generated by the driving voltage generator 800 is supplied to the driving electrode through the touch sensing unit 900.

The common voltage generating unit 800 and the driving voltage generating unit 100 may be formed as one voltage generating unit.

In addition, the common voltage and the driving voltage may have different sizes, and in particular, the driving voltage for touch sensing may have a value larger than a common voltage for video output.

In this case, the driving voltage may have the voltage corresponding to the common voltage as the low level voltage, and the higher voltage may have the high level voltage.

Finally, as described above, the touch sensing unit 900 performs a function of sensing a touch by a user using a sensing signal (voltage value) received from the receiving electrodes RS1 to RSs of the touch panel.

That is, when a user touches a specific area of the liquid crystal panel with a finger or a pen in a state in which a driving voltage for touch detection is applied to the driving electrodes TX1 to TXk of the touch panel configured as described above, The capacitance between the reception electrodes RS1 to RSk and the reception electrodes RS1 to RSs is changed and the change of the capacitance changes a voltage value (sensing signal) applied to the touch sensing unit 900 through the reception electrode.

And a plurality of touch sensors formed at intersections of the driving electrodes TX1 to TXK and the receiving electrodes RS1 to RSs.

For example, the number of touch sensors may be twelve Tx lines (TX1 to TX12) and nine Rx lines

(RS1 to RS9) intersect with each other.

Each touch sensor may be formed larger than a pixel, and each touch sensor may correspond to a plurality of pixels in the horizontal and vertical directions.

The receiving electrodes RS1 to RSs are connected to the touch sensing unit 900. The touch sensing unit 900 determines whether or not the touch sensing unit 900 uses the voltage value (sensing signal) as described above.

In this case, the sensing signal received through the touch sensing unit 900 in a state in which the touch sensing unit 900 is sensed may be detected by a separate touch position sensing unit (not shown) Not shown) or the timing controller 700 so that the touch position can be detected. However, the touch sensing unit 900 as described above may be configured to detect the touch position directly, as well as to determine whether or not the touch is sensed.

In the meantime, the present invention is to sequentially drive a gate line for image output and a driving electrode for touch sensing at a predetermined time interval, and is characterized in that a common voltage (Vcom) for image output and a driving voltage Vd) are driven to drive the gate line at a predetermined time interval.

Meanwhile, during one frame, the video output, that is, the display time period and the touch detection period, that is, the touch detection period may be alternately performed several times, and the number of times may be determined in consideration of the size of the touch sensing unit 600 and the number of wirings , But is not limited to a specific number.

FIG. 7 is a block diagram of a touch sensing unit 900 according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a driving timing diagram of the touch sensing unit 900. Referring to FIG.

Referring to FIG. 7, the touch sensing unit 900 according to the embodiment of the present invention may include a plurality of control signal generators 200.

Each of the plurality of control signal generators 200 may correspond to each of the driving electrodes 110.

The control signal output unit 200 can receive the first and second clock signals CKL1 and CK2 and the first and second control signals CS1 and CS2 from the timing controller 700, The driving signal TX CLK or the common voltage Vcom may be supplied to each of the driving electrodes 110 in accordance with the logical values of the first and second clock signals CKL1 and CK2 and the first and second control signals CS1 and CS2 .

Also, the first control signal output unit of the control signal output unit 200 can start the operation by receiving the start signal SP from the timing controller 700, and the control signal output unit of the next stage is provided from the control signal output unit of the previous stage And can operate in synchronization with the start signal or the output signal of the control signal output unit of the previous stage.

The control signal output unit 200 may include odd-numbered control signal output units 210 and 230 and even-numbered control signal output units 220 and 240. The odd-numbered control signal output units 210 and 230 may include The second clock signal CLK2 is applied to the even-numbered control signal output units 220 and 240 and the first and second control signals CS1 and CS2 are applied to the control And may be applied to each of the signal output devices 200.

For example, the (N-1) th control signal output unit 210 may include an (N-1) th driving electrode 111, And the N-th control signal output unit 220 may correspond to the N-th driving electrode 112.

Each of the control signal output units 210, 220, 230 and 240 includes first and second switches T1 and T2. When the first switch T1 is turned on, A driving voltage TXCLK may be supplied and the common voltage Vcom may be supplied to the driving electrode TX CLK when the second switch T2 is turned on. In the display period, the first switch T 1 is turned off, the second switch T 2 is turned on, and the control signal output from any one of the control signal output units 210, 220, 230, and 240 The first switch T1 of the signal output device is turned on and the second switch T2 is turned off so that the first and second switches T1 and T2 can be turned off.

Referring to FIG. 8, the operation timing of the touch sensing unit 900 according to the embodiment of the present invention will be described.

<N-1th touch time interval>

During the (N-1) -th touch time, the driving voltage (TX CLK) becomes a high logic signal.

In the drawing, four pulse waveforms are shown during the (N-1) -th touch period, but the number of pulse waveforms is not limited thereto.

Also, the first clock signal CLK1 becomes a high logic signal, the first control signal CS1 becomes a high logic signal, and the second control signal CS2 becomes a low logic signal.

The N-1th control signal output unit 210 turns on the (N-1) th first switch T1 so that the driving voltage TX CLK can be applied to the (N-1) th driving electrode 111, -1 &lt; th &gt; second switch T2 is turned off.

<N-1th display time interval>

During the (N-1) th display period, the driving voltage (TX CLK) is a signal of low logic.

Also, the first clock signal CLK1 becomes a signal of a low logic, the second clock signal CLK2 becomes a signal of a low logic, the first control signal CS1 becomes a signal of a low logic, (CS2) becomes a signal of high logic.

At this time, the (N-1) th control signal output unit 210 turns on the (N-1) th second switch T2 so that the common voltage Vcom can be supplied to the (N-1)

The (N-1) th control signal output unit 210 provides a start signal to the Nth shift resister 220 to enable the Nth control signal output unit 220 to operate.

<Nth touch time interval>

During the Nth touch time, the driving voltage (TX CLK) becomes a high logic signal.

Also, the first clock signal CLK1 holds a signal of low logic, the second clock signal CLK2 becomes a signal of high logic, and the third clock signal CKL3 becomes a signal of LOW logic.

At this time, the Nth control signal output unit 220 turns on the Nth first switch T1 so that the driving voltage TX CLK can be applied to the Nth driving electrode 112, and the Nth second switch T2 ) Is turned off.

<Nth display time interval>

The N-th control signal output unit 220 may provide the N-th driving electrode 112 with a driving voltage TXCLK for touch sensing when the N-1th control signal output unit 210 receives the start signal.

During the Nth display period, the driving voltage (TX CLK) becomes a low logic signal.

Also, the first clock signal CLK1 becomes a low logic signal, the second clock signal CLK2 becomes a low logic signal, the first control signal CS1 becomes a high logic signal, (CS2) becomes a signal of low logic.

At this time, the Nth second switch T2 of the Nth control signal output unit 212 is turned on so that the common voltage Vcom can be supplied to the Nth driving electrode 111.

The first switch T1 of the shift resister 200 corresponding to each of the driving electrodes 110 is turned on while the driving voltage (TX CLK) The driving voltage TX CLK is supplied to the driving electrode 110 so that the second clock signal CLK2 becomes a high logic signal and the third clock signal CLK3 is inverted to the second clock signal CLK2 And becomes a signal of low logic.

The second switch T2 of the control signal output unit 200 corresponding to each of the driving electrodes 110 is turned on and the common voltage Vcom Is supplied to the driving electrode 110 and the second clock signal CLK2 becomes a low logic signal and the third clock signal CLK3 becomes a signal of a high logic as opposed to the second clock signal CLK2 .

&Lt; Operation method of the N-1 &lt; th &gt; second switch in the N-th touch period &

During the N-th touch period, the (N-1) th control signal output 210 is supplied with the second clock signal CLK2 of high logic and the low logic And the third clock signal CLK3 of the low logic is applied to the control signal output unit 210. The control signal output unit 210 receives the second clock signal CLK2 of the high logic and the third clock signal CLK3 of the low logic, (T2) to cut off the common voltage (Vcom) supplied to the (N-1) th driving forehead (112).

That is, when the driving voltage TX CLK is supplied through the N-th control signal output unit 220, another shift resist, that is, the (N-1) th second switch T2 of the N-1th control signal output unit 220 is turned Off, thereby preventing noise from occurring.

In summary, the control signal output device 200 can operate in the next step.

When the first or second clock signal CLK1 or CLK2 is a high logic signal, the first control signal CS1 is a high logic signal and the second control signal CS2 is a low logic signal while a start signal is applied , The first switch T1 is turned on and the second switch T2 is turned off to supply the driving voltage TX CLK to the driving electrode 110.

When the first or second clock signal CLK1 or CLK2 is a signal of low logic, the first control signal CS1 is a low logic signal, and the second control signal CS2 is a high logic signal, the first switch T1 And the second switch T2 is turned on to supply a common voltage Vcom to the driving electrode 110 for display.

The first control signal CS1 is a high logic signal and the second control signal CS2 is a low logic signal and the first control signal CS2 applied to the odd control signal output units 210 and 230 is a low logic signal, The odd-numbered control signal output units 210 and 230 turn off the second switch T2 so that the common voltage Vcom supplied to the odd-numbered driving electrodes 110 and 130 is cut off, When the second clock signal CLK2 applied to the output devices 220 and 240 is a low logic signal and the first control signal CS1 is a high logic signal and the second control signal CS2 is a low logic signal, The even-numbered control signal output units 220 and 240 turn off the second switch T2 so that the common voltage Vcom supplied to the even-numbered driving electrodes 120 and 140 is cut off.

The control signal output device 200 operates in the first to third steps described above.

Accordingly, the touch sensing unit 900 according to the embodiment of the present invention is configured such that the wiring for supplying the driving voltage TX CLK and the wiring for supplying the common voltage Vcom are wrapped, In the electrode 110, the application of the common voltage Vcom is blocked to the driving electrode 110 where the touch sense is not used, thereby blocking the coupling noise, thereby improving the SNR (Signal to Noise) and improving the touch performance.

In the conventional touch sensing apparatus 60, first and third clock signal lines CLK1 and CLK3 connected to the odd-numbered driving voltage generating unit and second and fourth clock signal lines CLK1 and CLK3 connected to the even- The touch sensing unit 900 according to the embodiment of the present invention also requires wiring for the first and second clock signals CLK1 and CLK2 and first and second clock signals CLK1 and CLK2, The wiring for the second control signals CS1 and CS2, a total of four wirings are required, so there is no problem that the bezel increases.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

11 driving electrode
21 receiving electrode
31 TFT substrate
32 color filter substrate
33 liquid crystal layer
34 Cover Glass
40 liquid crystal panel
60 Touch Sensing Device
61 driving voltage generating unit
62 detection signal receiver
100 driving voltage generating unit
110 driving electrode
200 control signal output
120 receiving electrode
300 touch panel display
400 liquid crystal panel
500 gate driver
600 data driver
700 timing controller
800 common voltage generator
900 touch sensing unit

Claims (8)

A touch panel display device comprising a display electrode and a touch sensing period for one frame alternately repeated several times, a driving electrode for applying a driving voltage, and a receiving electrode for sensing a touch signal,
The touch panel display device includes a touch sensing unit,
Wherein the touch sensing unit includes a plurality of control signal output units and driving electrodes corresponding to the control signal output units on a one-to-one basis,
Each of the control signal output units outputs a common voltage to the driving electrode during the display period,
Wherein when any of the control signal output units of the control signal output units outputs the driving voltage during the touch sensing period, supply of the common voltage of the remaining control signal output units is interrupted. The method according to claim 1,
Wherein the first control signal output unit of the control signal output units is operated by a start signal,
And the control signal output unit of the next stage operates in synchronization with the output signal of the control signal output unit of the previous stage. 3. The method of claim 2,
The control signal output units receive a clock signal of high logic, a first control signal of high logic, and a second control signal of low logic to output a driving voltage to the driving electrode, and output a low logic clock signal, And outputs a common voltage to the driving electrode. The first control signal of the low logic, the first control signal of the high logic, and the second control signal of the low logic receive the control signal and the second control signal of the high logic, The common voltage supplied to the touch panel is cut off. 3. The method of claim 2,
Wherein each of the control signal output units includes first and second switches,
A driving voltage is supplied to the driving electrode when the first switch is turned on,
A common voltage is supplied to the driving electrode when the second switch is turned on,
In the display period, the first switch is turned off, the second switch is turned on,
The first switch of one of the control signal output units of the control signal output units is turned on and the second switch is turned off while the other control signal output units are turned off, Display device. The method according to claim 3 or 4,
And a timing controller for supplying the clock signal and the first and second control signals. The method according to claim 1,
Wherein the common voltage supplied to the driving electrode during the display period is used as a common electrode for applying a common voltage to the liquid crystal panel. A driving electrode for applying a touch driving voltage and a receiving electrode for sensing a touch signal, wherein the display region and the touch sensing period are alternately repeated several times during one frame,
A common voltage is applied to the driving electrodes during the display period,
Wherein a driving voltage is supplied to one of the driving electrodes during the touch sensing period, and a common voltage supplied to the remaining driving electrodes is interrupted. 8. The method of claim 7,
During the display period, the supply of the driving voltage to the driving electrode is cut off, the common voltage is supplied,
A driving method of a touch panel display device in which a driving voltage is supplied to one of the driving electrodes during the touch sensing period, supply of a common voltage is interrupted, and supply of a driving voltage and a common voltage to the remaining driving electrodes is interrupted .

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