KR20190075656A - touch type display device - Google Patents

Abstract

According to the present invention, the touch sensitivity may be increased by supplying a voltage level of a touch driving signal in inverse proportion to an area of each touch electrode in a sensing section. Furthermore, the image quality may be increased by supplying a voltage level of a common voltage in proportion to an area of each touch electrode in a display section.

Description

[0001] The present invention relates to a touch type display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch-type display device, and more particularly, to a touch-type display device capable of improving a touch sensitivity and improving picture quality.

In view of the information age, the display field has also been rapidly developed. As a flat panel display device (FPD) having the advantages of thinning, light weight, and low power consumption in response to the information age, ), A plasma display panel device (PDP), an organic light emitting diode (OLED) display device, and a field emission display device (FED) cathode ray tube (CRT).

In recent years, a touch-type display device (or a touch screen) having a touch panel on a display panel has been spotlighted.

The touch-type display device is used as an output means for displaying an image, and is used as input means for inputting a user's command by touching a specific portion of the displayed image. The touch panel of the touch- A pressure reduction 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 position information of the corresponding part and compare the detected position information with the position information of the image to recognize the user's command.

Such a touch-type display device can be manufactured such that a separate touch panel is attached to the display panel or the touch panel is formed on the substrate of the display panel and integrated.

In particular, in recent years, in order to reduce the size of a portable terminal such as a smart phone, a tablet PC, etc., an in-cell type touch-type display device in which electrodes and wirings constituting a touch panel are formed on a substrate of a display panel, Demand is increasing.

In a touch-type display device of an in-cell type, a touch block arranged in a matrix form in a display area of a display panel is defined, a self-cap type touch electrode is arranged in a unit of a touch block, Sensing wiring is connected.

In one frame of the touch-type display device, a display period and a sensing period are alternated. A common voltage is output to the sensing wiring and applied to the corresponding touch electrode during the display period. During the sensing period, A touch driving signal for the touch electrode is outputted to the sensing wiring and applied to the corresponding touch electrode.

1 is a schematic view of a conventional touch-type display device.

As shown in Fig. 1, the conventional touch-type display device 10 includes a touch driver 15 and a display panel 11. The touch-

The touch driver 15 generates a data signal and a touch driving signal, transmits the data signal and the touch driving signal to the display panel 11, and receives the sensing signal from the display panel 11.

The display panel 11 displays an image using a data signal, and senses a touch using a touch driving signal.

The display panel 11 includes a plurality of touch electrodes 17 formed in a unit of a touch block TB and a plurality of sensing wires SL connected to the plurality of touch electrodes 17 and connected to the touch driver 15, And a plurality of sensing lines SL transmit a common voltage or a touch driving voltage from the touch driver 15 to the plurality of touch electrodes 17 and a plurality of touch electrodes 17 from the plurality of touch electrodes 17 to the touch driver 15 And transmits a sensing signal.

The sensing line SL is connected to the touch electrode 17 of the corresponding touch block TB through the contact hole CH.

A display panel 11 of various shapes such as a notch having a groove or a corner of the display panel 11 in a part of the display panel 11 of the touch- Is being produced.

According to the shape of the display panel 11, the plurality of touch electrodes 17 formed in units of the touch block TB can not be arranged on the display panel 11 with a constant area, The image quality is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and it is an object of the present invention to provide a touch-type display device capable of improving the touch sensitivity and improving the quality of an image.

According to an aspect of the present invention, there is provided a touch panel including: a display panel including a notch groove; a plurality of touch electrodes disposed in the display panel and having different areas; Wherein the plurality of sensing wirings transmit a touch driving signal to the plurality of touch electrodes in a touch sensing period and a voltage level of the touch driving signal is inversely proportional to an area of the plurality of touch electrodes, Lt; / RTI >

The plurality of sensing wires transmit a common voltage to the plurality of touch electrodes in a display period, and the voltage level of the common voltage may be proportional to an area of the plurality of touch electrodes.

The plurality of touch electrodes may include a first touch electrode having a first area and a second touch electrode having a second area smaller than the first area and the second touch electrode may be formed in a region adjacent to the notch groove .

The corner of the display panel may have a round shape, and the second touch electrode may be disposed in an area adjacent to the corner.

The plurality of sensing wirings may include a first sensing wiring connected to the first touch electrode and a second sensing wiring connected to the second touch electrode.

The display device may further include a touch driver for supplying the touch driving signal to each of the plurality of sensing wires in the touch sensing period and supplying the common voltage to each of the plurality of sensing wires in the display period.

The touch driver may further include a controller for generating the touch driving signal and the common voltage at a plurality of different voltage levels.

In the present invention, the touch sensitivity can be improved by supplying the voltage level of the touch driving signal in inverse proportion to the area of each of the touch electrodes in the sensing period.

Furthermore, by supplying the voltage level of the common voltage in proportion to the area of each of the touch electrodes in the display period, the image quality can be improved.

1 is a schematic view of a conventional touch-type display device.
2 is a view schematically showing the structure of a touch-type display device according to an embodiment of the present invention.
3 is a plan view schematically showing a touch-type display device according to an embodiment of the present invention.
4A and 4B are views schematically showing a touch electrode of a touch-type display device according to an embodiment of the present invention.
5 is a block diagram schematically showing a touch driving circuit according to an embodiment of the present invention.
6 is a waveform diagram showing a state in which a touch driving signal and a common voltage are supplied to first and second touch electrodes of a touch-based display device according to an embodiment of the present invention.

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

Embodiments of the present invention can be applied to all kinds of display devices using a touch method. Hereinafter, for convenience of explanation, a liquid crystal display device will be described as an example.

2 is a view schematically showing the structure of a touch-type display device according to an embodiment of the present invention.

2, the touch-based display apparatus 100 according to the embodiment of the present invention includes a display panel 110 for displaying an image, a display panel 110 for controlling the display panel 110, And a touch driver 150 for sensing a touch to the touch panel.

More specifically, the touch-type display device 100 includes a display panel 110 in which a plurality of gate lines GL and data lines DL are arranged so as to cross each other, pixels are defined at intersections, A gate driver 140 for driving the display panel 110 through a gate line GL and a data line DL, a timing controller 120 for receiving a timing signal and a video signal RGB from the timing controller 120, And a touch driver 150 for sensing a touched position on the display panel 110 by a user during a sensing period and supplying a common voltage Vcom to the display panel 110 during a display period, .

The display panel 110 includes a plurality of gate wirings GL on a transparent substrate and a plurality of data wirings DL extending in a direction perpendicular to the gate wirings GL so as to be arranged in a matrix form, Are defined.

In each pixel region, a thin film transistor is formed, and a liquid crystal cell controlled by the thin film transistor is formed, thereby displaying a screen.

When the gate signal from the gate line GL, that is, the gate driving voltage VG at a high potential, is applied, the thin film transistor described above is turned on to transfer the pixel voltage applied from the data line DL to the liquid crystal cell .

In addition, when the gate driving voltage VG of a low potential is applied from the gate line GL, the thin film transistor is turned off so that the pixel voltage charged in the liquid crystal cell is maintained for one frame.

In a liquid crystal cell, a pixel electrode and a common electrode are opposed to each other to form a capacitor. The liquid crystal cell is composed of a common electrode connected to the common wiring and a pixel electrode connected to the drain of the thin film transistor.

The liquid crystal cell may further be connected to a storage capacitor for causing the charged pixel voltage to stably maintain the potential until the next frame.

The arrangement of the liquid crystal is changed according to the electric field formed between the pixel voltage charged through the thin film transistor and the common voltage applied to the common electrode so that the light transmittance of the liquid crystal cell is controlled to realize the gray level.

On the display panel 110, a sensing wiring SL formed in a layer different from the layer in which the gate and data wirings GL and DL are formed is formed.

The sensing wiring SL serves to transmit the position where the touch is generated to the touch driver 150.

The timing controller 120 receives timing data such as a clock signal DCLK, a horizontal synchronization signal Hsync and a vertical synchronization signal Vsync from the image data DATA applied from an external system (not shown) And generates a gate control signal GCS and a data control signal DCS.

Here, the horizontal synchronization signal Hsync represents the time taken to display one horizontal line of the screen, and the vertical synchronization signal Vsync represents the time taken to display the screen of one frame.

The clock signal DCLK is a signal for generating various signals in synchronization with the gate and data drivers 140 and 130 and the timing controller 120. The data enable signal DE is supplied to the display panel 110 And is a signal indicating a period of supplying the pixel voltage to the pixel electrode

Although not shown, the timing controller 120 is connected to an external system (not shown) through a predetermined interface, and receives image related signals and timing signals output from the external system at a high speed without error in the timing controller 120 do.

As such an interface, a Low Voltage Differential Signal (LVDS) method or a Transistor-TransistorLogic (TTL) interface method can be used.

The gate driver 140 includes a plurality of shift registers connected to the display panel 110 through a gate line GL.

Each shift register sequentially outputs a gate driving signal to the gate line GL by one horizontal line to the display panel 110 under the control of the timing controller 120. [

The gate driving unit 140 turns on the thin film transistors arranged on the display panel 110 in response to the gate control signal GCS applied from the timing controller 120, So that the pixel voltage of the analog waveform supplied from the liquid crystal cell 130 is applied to the liquid crystal cell connected to each thin film transistor.

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

The gate start pulse GSP is a signal for controlling the first gate pulse to be applied to the shift register for generating the first gate pulse among the plurality of shift registers constituting the gate driver 140, (GSC) is a clock signal commonly input to all shift registers, and is a clock signal for shifting the gate start pulse (GSP).

The gate output enable (GOE) controls the output of the shift registers to prevent turn-on of the thin film transistors overlapped with each other in the different horizontal sections.

The data driver 130 sequentially receives digital video signals DATA corresponding to the data control signals input from the timing controller 120 and converts them into analog pixel voltages with reference to the reference voltages.

The pixel voltage is latched by one horizontal period and input to the display panel 110 simultaneously through all the data lines DL.

The data control signal DCS includes a source start pulse (SSP), a source shift clock (SSC), and a source output enable (SOE).

Here, the source start pulse SSP is a signal for controlling the data sampling start timing of the data driver 130, and the source sampling clock SSC is a clock signal for driving the driving ICs 130, Which controls the sampling timing of data.

In addition, the source output enable (SOE) controls the output timing of the data driver 130.

The touch driver 150 detects whether or not the touch panel 110 is touched in response to the touch control signal TCS applied from the timing controller 120, to be.

The touch driver 150 may include a Low Pass Filter (LPF), an A / D converter, a signal processor, and a coordinate extractor.

The LPF is a low-pass filter that removes high frequency components included in the sensing result transmitted from the sensing wiring SL of the display panel 110, and extracts only the touch components and outputs them.

The A / D converter converts the analog signal output from the LPF into a digital signal. The signal processing unit is a logic circuit that detects the presence or absence of a touch on a touch point in response to an output signal of the A / D converter.

The coordinate extraction unit is a logic circuit that obtains its coordinates when touch detection is performed in the signal processing unit.

Further, the touch driver 150 can supply the common voltage Vcom to the common wiring of the display panel 110. [

3 is a plan view schematically showing a touch-type display device according to an embodiment of the present invention.

3, the touch-type display device 100 of FIG. 2 includes a plurality of touch electrodes TB1 and TB2 serving as a touch sensor, a plurality of touch electrodes TB1 and TB2 serving as a touch sensor, And a touch driver 150 driving the electrodes TB1 and TB2 to sense a touch.

 In particular, the display panel 110 of the touch-type display device 100 of FIG. 2 according to the embodiment of the present invention may include a notch home (NH).

The notch groove (NH) or notch means a shape having a part or an edge that is a part of the flat part drawn by a square or triangle.

Although the notch grooves NH are shown as being rounded at both ends of the flat portion and the flat portion, the notch groove NH may be formed in various shapes such as a semicircular shape and a polygonal shape.

Parts such as a camera can be positioned in the notch groove NH and both sides of the notch groove NH can be formed as a display area to further enlarge the display area of the touch-type display device 100 .

In addition, the display panel 100 of the touch-type display device 100 of FIG. 2 according to the embodiment of the present invention may have rounded corners C1, C2, C3, and C4.

Note that the notch groove NH and the rounded corners C1, C2, C3, and C4 of the display panel 110 are merely examples and the present invention is not limited thereto. The display panel 110 of the present invention may have various shapes Lt; / RTI >

The plurality of touch electrodes TB1 and TB2 formed on a block basis in the touch-type display device 100 of FIG. 2 according to the embodiment of the present invention may have different areas.

For example, it may include a plurality of first touch electrodes TB1 having a first area and a plurality of second touch electrodes TB2 having a second area smaller than the first area. However, the present invention is not limited thereto, and three or more touch electrodes TB1 and TB2 having different areas according to the shape of the display panel 110 may be formed.

The second touch electrode TB2 may be disposed in an area adjacent to the notch groove NH and the edges C1, C2, C3, and C4. For example, it may be disposed in a region adjacent to the rounded shape of the notch groove NH and in an area adjacent to each of the corners C1, C2, C3, and C4.

The first touch electrode TB1 may be disposed in an area other than the area where the second touch electrode TB2 is disposed.

That is, the second touch electrode TB2 may be defined as a touch electrode having a smaller area than the first touch electrode TB1 by removing a part of the first touch electrode TB1.

The second touch electrode TB1 having a smaller area than the first touch electrode TB1 is formed in a region adjacent to the notch groove NH and the edges C1, C2, C3, and C4 in which the first touch electrode TB1 is difficult to arrange, The entire display panel 110 can serve as a touch sensor.

The touch driver 150 may include a touch driving circuit 155 and a switching circuit 153.

The touch driving circuit 155 sequentially supplies the touch driving signal TDS to the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2, The first touch electrode TB1 and the plurality of second touch electrodes TB2 can be sequentially driven.

The touch driving circuit 155 receives touch sensing signals from the first touch electrodes TB1 and the second touch electrodes TB2 to which the touch driving signal TDS is applied.

The touch driving circuit 155 can calculate the touch presence / absence and touch coordinates based on the touch sensing signals received from the first touch electrodes TB1 and the second touch electrodes TB2, respectively.

Here, the touch-driving signal TDS may have a waveform of a pulse-modulated signal having two or more voltage levels.

The touch sensing signal received from each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 may vary depending on the presence or absence of a touch caused by a pointer such as a finger or a pen in the vicinity of the touch electrode .

The touch driving circuit 155 can detect the amount of change in capacitance in the touch electrodes TB1 and TB2 based on the touch sensing signal, and can obtain touch presence and touch coordinates.

In order to supply the touch driving signal TDS to the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2, a plurality of first touch electrodes TB1 and a plurality of second touch electrodes TB1, And a sensing wiring SL is connected to each of the transistors TB2.

In particular, the touch-type display device 100 of FIG. 2 includes a plurality of first sensing lines SL1 and a plurality of second touch electrodes TB1 connected to the plurality of first touch electrodes TB1, And a plurality of second sensing wires SL2 connected to the first and second sensing wires TB2 and TB2, respectively.

The plurality of first sensing lines SL1 may be connected to each other and the plurality of second sensing lines SL2 may be connected to each other. However, the second sensing lines SL2 may be connected to each other by a plurality of groups.

In order to sequentially supply the touch driving signal TDS to the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2, a plurality of first touch electrodes TB1 and a plurality of second And a switch circuit 153 for sequentially connecting the sensing wires SL1 and SL2 connected to the respective touch electrodes TB2 to the touch driver circuit 155. [

The switch circuit 153 may be composed of at least one multiplexer.

Each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 may have a block shape, but the present invention is not limited thereto.

Each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 may have a size equal to or corresponding to the size of one sub pixel, May be a size larger than the size of the region of FIG.

The plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 may be formed of an in-cell type or an on-cell type, Type touch-type display device (100 in Fig. 2).

Meanwhile, the touch-type display device (100 of FIG. 2) according to the embodiment of the present invention may operate in a display mode to provide a display function, or may operate in a sensing mode to provide a touch sensing function.

That is, each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 operates as a touch sensor in a sensing period, but may also be used as an electrode in a display mode in a display period.

For example, in the display period, a plurality of first touch electrodes TB1 and a plurality of second touch electrodes TB2 may operate as common electrodes to which the common voltage Vcom is applied.

Here, the common voltage Vcom is a voltage corresponding to the pixel voltage applied to the pixel electrode.

In order to transmit the common voltage Vcom or the touch driving signal TDS to the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2, a plurality of first touch electrodes TB1 and a plurality of The first and second sensing lines SL1 and SL2 may be connected to the two touch electrodes TB2, respectively.

Accordingly, in the sensing period, the touch driving signal TDS generated in the touch driver 150 through the first and second sensing lines SL1 and SL2 is applied to the first touch electrode TB1 and the plurality of second touch The common voltage Vcom generated in the touch driver 150 through the first and second sensing lines SL1 and SL2 in the display period is transferred to all or a portion of the electrode TB2 and the one touch electrode TB1, And is applied to the second touch electrode TB2.

Particularly, in the touch-type display device 100 of FIG. 2 according to the embodiment of the present invention, touch sensing is performed in inverse proportion to the area of each of the first touch electrodes TB1 and the plurality of second touch electrodes TB2 in the sensing period. The signal TDS can be applied.

That is, since the area of the first touch electrode TB1 is larger than the area of the second touch electrode TB2, the voltage level of the second touch electrode TB1 is greater than the voltage level of the touch driving signal TDS applied to the first touch electrode TB1. The voltage level of the touch driving signal TDS applied to the touch panel TB2 may be large.

Accordingly, the touch sensitivity can be improved by applying the touch driving signal TDS having a higher voltage level to the second touch electrode TB2 having a smaller area than the first touch electrode TB1.

In the display period of the touch-type display device 100 according to the embodiment of the present invention, the common voltage Vcom (Vcom) is proportional to the area of each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2, ) May be applied.

That is, since the area of the first touch electrode TB1 is larger than the area of the second touch electrode TB2, the voltage level of the common voltage Vcom applied to the first touch electrode TB1 is greater than the voltage level of the common voltage Vcom applied to the second touch electrode TB1 The voltage level of the common voltage Vcom applied to the transistors TB1 and TB2 may be small.

Accordingly, by applying the common voltage Vcom having a smaller voltage level to the second touch electrode TB2 having a smaller area than the first touch electrode TB1, it is possible to prevent the deterioration of the picture quality due to the resistance difference depending on the area do.

4A and 4B are views schematically showing a touch electrode of a touch-type display device according to an embodiment of the present invention.

As shown in FIG. 4A, each of the first and second touch electrodes TB1 and TB2 may be connected to the first and second sensing lines SL1 and SL2.

That is, the plurality of first touch electrodes TB1 may be connected to the plurality of first sensing lines SL1, and the plurality of second touch electrodes TB2 may be connected to the plurality of second sensing lines SL2, respectively. have.

The plurality of first touch electrodes TB1 may have a first area and the plurality of second touch electrodes TB2 may have a second area that is smaller than the first area.

The first touch electrode TB1 may be disposed in an area other than the area where the second touch electrode TB2 is disposed.

The plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2 may be disposed on the same layer and may be formed of the same material through the same process. In this case, a separate mask process for forming the first touch electrode TB1 and the second touch electrode TB2 is not performed, which is advantageous in terms of process.

 Also, at least one contact hole (CH1, CH2) may be disposed in each of the plurality of first touch electrodes TB1 and the plurality of second touch electrodes TB2.

At least one first contact hole CH1 may be disposed in each of the plurality of first touch electrodes TB1 and at least one second contact hole CH2 may be provided in each of the plurality of second touch electrodes TB2. Can be arranged.

The plurality of first touch electrodes TB1 may be connected to the first sensing wiring SL1 through the first contact holes CH1 and the plurality of second touch electrodes TB2 may be connected to the second contact holes CH2 The second sensing line SL2 may be connected to the second sensing line SL2.

The plurality of first touch electrodes TB1 may be connected to one first sensing line SL1. However, the present invention is not limited thereto, and may be divided into a plurality of group units and connected to each group by the same first sensing wiring SL1.

Also, the plurality of second touch electrodes TB2 may be connected to one second sensing line SL2. However, the present invention is not limited thereto, and may be divided into a plurality of groups and connected to each other by the same second sensing wiring SL2.

Here, the first sensing wiring SL1 and the second sensing wiring SL2 may be located on the same layer and may be formed of the same material through the same process.

In this case, a separate mask process for forming the first sensing wiring SL1 and the second sensing wiring SL2 is not performed, which is advantageous in terms of process.

It is preferable that the first and second contact holes CH1 and CH2 formed in the first touch electrode TB1 and the second touch electrode TB2 are formed in plural numbers.

When a plurality of first and second contact holes CH1 and CH2 are formed, the first and second touch electrodes TB1 and TB2, which are connected to the first and second sensing lines SL1 and SL2, respectively, Can be reduced.

This reduces the common voltage Vcom applied to the first and second sensing lines SL1 and SL2 to the first and second touch electrodes TB1 and TB2, The first touch electrode TB1 and the second touch electrode TB2 can be preferably supplied to the first touch electrode TB1 and the second touch electrode TB2.

4B, the second sensing line SL2 and the second contact hole CH2 may be disposed along the edge of the second touch electrode TB2. In this case, the sensing lines SL1 and SL2 ) Can be optimized. The positions of the sensing wires SL1 and SL2 and the contact holes CH1 and CH2 may be arranged in various forms according to the size and resolution of the display panel 110 (FIG. 3).

5 is a block diagram schematically showing a touch driving circuit according to an embodiment of the present invention.

5, the touch driving circuit 155 disposed in the touch-sensitive display device 100 of the present invention includes a generating portion 155A for generating a touch driving signal TDS and a common voltage Vcom, ) And the generated touch drive signal TDS and the common voltage Vcom are applied to the respective touch electrodes (TB1 and TB2 of FIG. 3) or the touch electrodes (TB1 and TB2 of FIG. 3) of the display panel And a control unit 155B for generating and outputting the touch driving signal TDS and the common voltage Vcom of corresponding different voltage levels.

The control unit 155B controls the touch driving signal TDS to be supplied to each of the touch electrodes (TB1 and TB2 of FIG. 3) or each touch electrode (TB1 and TB2 of FIG. 3) of the display panel A determination unit 180 for determining a common voltage Vcom and a touch driving signal TDS and a common voltage Vcom output from the generating unit 155A to a plurality of touch driving signals TDS And a control unit 183 for selecting and outputting the touch driving signal TDS and the common voltage Vcom determined by the determining unit 180 do.

More specifically, in the determination unit 180 of the control unit 155B, a touch electrode (TB1, TB2, or TB1, TB2 in FIG. 3) or a touch electrode (TB1, TB2 in FIG. 3) for supplying the touch drive signal TDS and the common voltage Vcom, And determines the touch drive signal TDS and the common voltage Vcom level to be supplied to the designated touch electrode (TB1, TB2 of FIG. 3) or the touch electrode (TB1, TB2 of FIG. 3).

2, the voltage level of the touch driving signal TDS applied in the sensing period is divided into a plurality of first touch electrodes (TB1 in FIG. 3) and a plurality of first touch electrodes The voltage level of the common voltage Vcom applied to the display period can be determined by a plurality of first touch electrodes (TB1 of FIG. 3) and a plurality of second touch electrodes (TB2 in Fig. 3).

The touch driving signal TDS and the common voltage Vcom determined by the determining unit 180 are controlled by a control unit 183 to output a plurality of touch driving signals TDS ) And the common voltage Vcom and can be transmitted to the switch circuit 160 (Fig. 3).

In the switch circuit 153 in FIG. 3, the touch driving signal TDS and the common voltage Vcom supplied from the adjusting unit 155B can be supplied to the sensing wiring SL through the multiplexer MUX.

6 is a waveform diagram showing a state in which a touch driving signal and a common voltage are supplied to first and second touch electrodes of a touch-based display device according to an embodiment of the present invention.

As shown in FIG. 6, the driving mode of the touch-type display device 100 of FIG. 2 of the present invention can be time-divided into a display period DP and a sensing period TP within one frame period.

The touch driving signals TDS1 and TDS2 having different voltage levels and the common voltage VDS are applied to the first touch electrode TB1 and the second touch electrode TB2 in the display period DP within one frame period, Vcom1, and Vcom2 are applied.

The common voltages Vcom1 and Vcom2 may be applied to the display region DP in proportion to the areas of the first and second touch electrodes TB1 and TB2.

That is, since the area of the second touch electrode TB2 is smaller than the area of the first touch electrode TB1, the second common voltage Vcom1 applied to the first touch electrode TB1 is smaller than that of the second touch electrode TB2 The voltage level of the applied second common voltage Vcom2 may be small.

Accordingly, by applying the second common voltage Vcom having a smaller voltage level to the second touch electrode TB2 having a smaller area than the first touch electrode TB1, it is possible to prevent a deterioration in image quality due to a resistance difference depending on the area .

On the other hand, in the sensing period DP, the touch driving signals TDS1 and TDS2 may be applied in inverse proportion to the areas of the first and second touch electrodes TB1 and TB2.

That is, since the area of the second touch electrode TB2 is smaller than the area of the first touch electrode TB1, the area of the second touch electrode TB1 is smaller than the area of the first touch electrode TB1, The voltage level of the second touch driving signal TDS2 applied to the second touch panel TB2 may be large.

Accordingly, the touch sensitivity can be improved by applying the touch driving signal TDS having a higher voltage level to the second touch electrode TB2 having a smaller area than the first touch electrode TB1.

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 as defined in the appended claims. It can be understood that

110: display panel 150: touch driver
153: switching circuit 155: touch driving circuit
TB1: first touch electrode TB2: second touch electrode
SL1: first sensing wiring SL2: second sensing wiring
TDS: Touch drive signal Vcom: Common voltage
NH: Notch grooves C1, C2, C3, C4: Corner

Claims (7)

A display panel including a notch groove;
A plurality of touch electrodes disposed in the display panel and having different areas;
A plurality of sensing wires connected to the plurality of touch electrodes, respectively;
Wherein the plurality of sensing wirings transmit a touch driving signal to the plurality of touch electrodes during a touch sensing period and a voltage level of the touch driving signal is inversely proportional to an area of the plurality of touch electrodes.
The method according to claim 1,
Wherein the plurality of sensing wirings transmit a common voltage to the plurality of touch electrodes in a display period and a voltage level of the common voltage is proportional to an area of the plurality of touch electrodes.
The method according to claim 1,
Wherein the plurality of touch electrodes include a first touch electrode having a first area and a second touch electrode having a second area smaller than the first area,
And the second touch electrode is disposed in a region adjacent to the notch groove.
The method of claim 3,
Wherein the corner of the display panel has a round shape and the second touch electrode is disposed in a region adjacent to the corner.
The method of claim 3,
Wherein the plurality of sensing wirings include a first sensing wiring connected to the first touch electrode and a second sensing wiring connected to the second touch electrode.
3. The method of claim 2,
And a touch driver for supplying the touch driving signal to each of the plurality of sensing wires in the touch sensing period and supplying the common voltage to each of the plurality of sensing wires in the display period.
The method according to claim 6,
Wherein the touch driver further comprises an adjuster for generating the touch driving signal and the common voltage at a plurality of different voltage levels.

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