KR20190054684A - Touch display device, touch panel, touch driving circuit, and driving method - Google Patents

Abstract

Embodiments of the present invention relate to a touch display device, a touch panel, a touch driving circuit, and a driving method and, more specifically, to a touch display device receiving feedback on panel noise and minimizing impact on panel noise on touch sensing and display, a touch panel, a touch driving circuit, and a driving method.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch display device, a touch panel, a touch driving circuit, and a driving method.

The present invention relates to a touch display device, a touch panel, a touch driving circuit, and a driving method.

BACKGROUND ART [0002] As an information society develops, a demand for a touch display device for displaying an image has increased in various forms. Recently, various display devices such as a liquid crystal display device, a plasma display device, and an organic light emitting display device have been utilized.

Among such display devices, there is a touch display device that provides a touch-based input method that allows a user to easily input information or commands intuitively and conveniently by moving away from a conventional input method such as a button, a keyboard, and a mouse.

In the conventional touch display device, during the touch driving period, the touch electrode to be sensed is affected by the peripheral electrodes and the wirings, and the touch sensitivity is greatly reduced.

In addition, since the conventional touch display device must provide both the video display function and the touch sensing function, the driving time such as the frame time is divided into the display driving period and the touch driving period, the display driving is performed in the display driving period , And performs touch driving and touch sensing in a touch driving period after the display driving period.

In the case of the time division driving method, in order to progress the display driving and the touch driving in a time division manner, a very precise timing control is required and an expensive part for the time control may be required.

In the case of the time division driving method, both the display driving time and the touch driving time may be insufficient, and thus the image quality and the touch sensitivity are both lowered. Particularly, there may be a problem that high resolution image quality can not be provided due to time division driving.

In view of the above, it is an object of embodiments of the present invention to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of accurately detecting a touch without being affected by panel noise, Method.

It is another object of embodiments of the present invention to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of stably performing time free driving capable of simultaneously performing display and touch sensing There is.

It is another object of embodiments of the present invention to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of minimizing the influence of ripples generated in a touch electrode serving as a common electrode on touch detection and display .

It is another object of embodiments of the present invention to provide a touch display device capable of preventing display due to ripple and crosstalk between touches caused by a touch electrode serving as a common electrode in an environment in which display driving and touch driving are simultaneously performed, , A touch panel, a touch driving circuit, and a driving method.

In one aspect, embodiments of the present invention can provide a touch display device including a touch panel in which a plurality of touch electrodes are disposed in a touch region, and a touch driving circuit that detects a sensing signal by driving the touch panel.

During the first time period, the plurality of touch electrodes may be classified into at least one touch target electrode selected for the first time period, and at least one non-touch target touch electrode other than the at least one touch target touch target electrode.

During the first time period, the touch driving circuit supplies a driving signal to one or more non-sensing target touch electrodes, supplies a reception signal received from the touch panel to one or more sensing target touch electrodes, The detection signal can be detected.

As an example of a structure and a method for receiving a received signal from a touch panel, a touch panel may be provided with one or more dummy electrodes arranged in an outer area of the touch area and one or more dummy electrodes for supplying signals from the touch drive circuit to one or more dummy electrodes Line and at least one feedback line for signal transmission from the at least one dummy electrode to the touch-driving circuit.

In this case, during the first time period, the touch driving circuit supplies a driving signal to one or more dummy electrodes through one or more supply lines when supplying driving signals to one or more non-sensing target touch electrodes, The supplied driving signal can be fed back via one or more feedback lines and the fed driving signal (receiving signal received from the touch panel) can be supplied to one or more sensing target touch electrodes.

As another example of the structure and method for receiving a received signal from the touch panel, one or more feedback lines for signal transmission from one or more non-sensing target touch electrodes to a touch driving circuit may be disposed on the touch panel.

In this case, during the first time period, the touch driving circuit supplies a driving signal to at least one non-sensing target touch electrode, and supplies a driving signal supplied to the selected one of the at least non-sensing target touch electrodes to the feedback touch electrode And feeds back the feedback driving signal (the reception signal received from the touch panel) to one or more sensing target touch electrodes.

In another aspect, embodiments of the present invention are directed to a touch comprising a plurality of touch electrodes disposed in a touch region, one or more dummy electrodes disposed in an outer region of the touch region, and one or more feedback lines connected to one or more dummy electrodes Panel can be provided.

During the first time period, the plurality of touch electrodes may be classified into at least one touch target electrode selected for the first time period, and at least one non-touch target touch electrode other than the at least one touch target touch target electrode.

A driving signal is supplied to at least one non-sensing target touch electrode, a driving signal is supplied to one or more dummy electrodes, and a signal corresponding to a signal output from the at least one feedback line is supplied to one or more sensing target touch electrodes As shown in FIG.

According to another aspect of the present invention, there is provided a touch panel including a plurality of touch electrodes disposed in a touch area, a plurality of touch lines connected to the plurality of touch electrodes, and a plurality of feedback lines connected to the plurality of touch electrodes. Can be provided.

During the first time period, the plurality of touch electrodes may be classified into at least one touch target electrode selected for the first time period, and at least one non-touch target touch electrode other than the at least one touch target touch target electrode.

A driving signal is supplied to one or more non-sensing target touch electrodes during a first time period, and a signal corresponding to a signal output from a feedback line connected to one of the at least one non-sensing target touch electrodes is supplied to one or more sensing target touch electrodes .

According to another aspect of the present invention, there is provided a touch panel including a first driving unit for supplying a driving signal to at least one non-sensing target touch electrode other than a selected one of the plurality of touch electrodes, And a second driver for supplying a feedback signal to the at least one touch target electrode as a drive signal.

According to another aspect of the present invention, there is provided a method of driving a touch sensor, comprising: supplying a driving signal to at least one non-sensing target touch electrode other than a selected sensing target touch electrode among a plurality of touch electrodes; And supplying a feedback signal to the at least one touch target electrode to be sensed as a drive signal.

As described above, according to the embodiments of the present invention described above, it is possible to provide a touch display device, a touch panel, a touch driving circuit, and a driving circuit, which can accurately detect a touch without being affected by panel noise, Method can be provided.

According to embodiments of the present invention, it is possible to provide a touch display device, a touch panel, a touch driving circuit, and a driving method capable of stably performing time free driving capable of simultaneously performing a display and a touch sensing have.

According to embodiments of the present invention, there is provided a touch display device, a touch panel, a touch driving circuit, and a driving method capable of minimizing the influence of a ripple generated in a touch electrode serving as a common electrode on touch detection and display .

According to embodiments of the present invention, it is possible to provide a touch display device capable of preventing crosstalk between display and touch due to ripple induced in a touch electrode serving as a common electrode in a circumstance simultaneously performing display driving and touch driving, A panel, a touch driving circuit, and a driving method.

1 and 2 are system configuration diagrams of a touch display device according to embodiments of the present invention.
FIG. 3 is a diagram illustrating a display panel in which a touch panel is incorporated in a touch display device according to embodiments of the present invention.
4 is a time-division driving timing diagram of the touch display device according to the embodiments of the present invention.
5 is a time-pre-driving timing diagram of the touch display device according to the embodiments of the present invention.
6 is a diagram illustrating a ground environment of a touch display device according to embodiments of the present invention.
7 is a time-pre-driving timing diagram at the time of ground modulation in the touch display device according to the embodiments of the present invention.
8 is a diagram illustrating a touch driving circuit of a touch display apparatus according to embodiments of the present invention.
9 is a diagram illustrating a touch driving operation for one touch electrode row performed by the touch driving circuit of the touch display device according to the embodiments of the present invention.
10 is a diagram illustrating a touch driving operation of a touch panel performed by a touch driving circuit of a touch display apparatus according to embodiments of the present invention.
FIG. 11 is a view for explaining a common voltage ripple phenomenon occurring during a touch operation of a touch display device according to embodiments of the present invention and a touch detection failure according to the present invention. FIG.
FIG. 12 is a diagram schematically illustrating a touch driving structure capable of preventing a decrease in touch sensitivity and display quality due to a common voltage ripple that may be generated in a driving operation of the touch display device according to the embodiments of the present invention.
13 is a diagram illustrating a first touch driving structure for preventing touch sensitivity due to a common voltage ripple that may be generated during a driving operation of the touch display device according to the exemplary embodiments of the present invention and degradation of display quality.
FIG. 14 is a diagram illustrating a second touch driving structure for preventing touch sensitivity due to a common voltage ripple that may be generated during a driving operation of the touch display device according to the exemplary embodiments of the present invention, and degradation of display quality.
15 is a block diagram of a touch driving circuit according to embodiments of the present invention.
16 is a flowchart of a driving method according to embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening " or that each component may be " connected, " " coupled, " or " connected " through other components.

1 and 2 are system configuration diagrams of a touch display device according to embodiments of the present invention.

The touch display device according to embodiments of the present invention can perform a video display function and a touch detection function (touch input function).

Hereinafter, configurations of a touch display device according to embodiments of the present invention for providing a video display function will be described with reference to FIG. 1, and a touch display device according to embodiments of the present invention will be described with reference to FIG. Function) will be described with reference to Fig.

Referring to FIG. 1, the touch display apparatus according to embodiments of the present invention may include a display panel DISP and driving circuits for driving the display panel DISP to provide a video display function.

In the display panel DISP, a plurality of data lines DL and a plurality of gate lines GL are arranged, and a plurality of data lines DL and a plurality of gate lines GL defined by the plurality of data lines DL and the plurality of gate lines GL. Of subpixels SP are arranged.

The driving circuits for driving the display panel DISP include a data driving circuit DDC driving a plurality of data lines DL, a gate driving circuit GDC driving a plurality of gate lines GL, A display controller (D-CTR) for controlling the data driver circuit (DDC) and the gate driver circuit (GDC), and the like.

In the display panel DISP, pixel electrodes in each subpixel SP can be arranged.

A pixel voltage may be applied to the pixel electrode of each subpixel SP.

Also, one or two or more common electrodes to which a common voltage is applied may be disposed on the display panel DISP.

One common electrode is one common electrode formed on the front surface of the display panel DISP.

Two or more common electrodes can be regarded as electrodes in which one common electrode is divided into two or more electrodes. Each of the two or more common electrodes may have a size larger than one sub-pixel region size.

In each subpixel SP, an electric field may be formed by a pixel voltage (which may be a data voltage) applied to the pixel electrode and a common voltage applied to the common electrode.

The display controller D-CTR supplies various driving control signals DCS and GCS to the data driving circuit DDC and the gate driving circuit GDC to supply the data driving circuit DDC and the gate driving circuit GDC .

The display controller (D-CTR) starts the scanning in accordance with the timing implemented in each frame, switches the input image data inputted from the outside according to the data signal format used in the data driving circuit (DDC) (DATA), and controls the data driving at a suitable time according to the scan.

The display controller (D-CTR) may include a timing controller used in the field of display technology, and may be a control device further including other control functions or modules.

The display controller (D-CTR) may be implemented as a separate component from the data driver circuit (DDC), integrated with the data driver circuit (DDC), and implemented as an integrated circuit.

The data driving circuit DDC receives the image data DATA from the display controller D-CTR and supplies the data voltages to the plurality of data lines DL to drive the plurality of data lines DL .

The data driver circuit (DDC) may be implemented by including at least one source driver integrated circuit.

Each source driver integrated circuit may be connected to a bonding pad of the display panel DISP by a tape automated bonding (TAB) method or a chip on glass (COG) method, Or may be disposed directly on the display panel DISP and, if necessary, integrated on the display panel DISP. In addition, each source driver integrated circuit (SDIC) may be implemented by a chip on film (COF) method mounted on a film connected to the display panel DISP.

The gate drive circuit GDC sequentially supplies the scan signals to the plurality of gate lines GL to sequentially drive the plurality of gate lines GL.

Such a gate drive circuit GDC may be implemented by including at least one gate driver integrated circuit.

Each gate driver integrated circuit may be connected to a bonding pad of a display panel DISP by a tape automated bonding (TAB) method or a chip on glass (COG) method, or may be implemented as a GIP (Gate In Panel) type May be disposed directly on the display panel DISP, and may be integrated and disposed on the display panel DISP, as the case may be. In addition, each gate driver IC (GDIC) may be implemented in a chip-on-film (COF) manner in which the gate driver IC (GDIC) is mounted on a film connected to the display panel (DISP).

The gate drive circuit GDC sequentially applies a scan signal (gate signal) of an On voltage or an Off voltage to the plurality of gate lines GL in accordance with the control of the display controller D-CTR Supply.

When a specific gate line is opened by the gate drive circuit GDC, the data driving circuit DDC converts the image data (DATA) received from the display controller (D-CTR) into an analog type data voltage, (DL).

The data driving circuit DDC may be located only on one side (e.g., the upper side or the lower side) of the display panel DISP and may be disposed on both sides of the display panel DISP : Upper side and lower side).

The gate drive circuit GDC may be located only on one side (e.g., the left side or the right side) of the display panel DISP and may be disposed on both sides of the display panel DISP For example, left and right).

Referring to FIG. 2, in order to provide a touch sensing function, the touch display device according to embodiments includes a touch panel (TSP) and a touch circuit (TSP) (TC).

The touch circuit TC may include a touch driving circuit (TDC) and a touch controller (T-CTR).

The touch driver circuit (TDC) and the touch controller (T-CTR) may be separately implemented, or may be integrated into one.

In the touch panel TSP, a plurality of touch electrodes TE are arranged in a touch region (corresponding to a display region), and a plurality of touch lines TL electrically connected to the plurality of touch electrodes TE are arranged .

Each touch electrode TE may be an electrode without an opening.

Alternatively, each touch electrode TE may be a mesh-type electrode having a plurality of openings and may be a comb-like electrode.

Each touch electrode TE may be electrically connected to one or more touch lines TL through one or more contact holes or the like.

The plurality of touch lines TL electrically connect the plurality of touch electrodes TE to the touch driving circuit TDC.

The touch driver circuit (TDC) drives the touch panel (TSP) to generate and output sensing data (Sensing Data).

For example, the touch driving circuit TDC supplies a driving signal to all or a part of the plurality of touch electrodes TE disposed on the touch panel TSP, detects a sensing signal from at least one touch electrode TE The sensing data can be generated and output.

The touch driving circuit TDC can supply a driving signal (touch driving signal) to one or more touch electrodes TE through one or more touch lines TL and detect a sensing signal (touch sensing signal).

The touch controller (T-CTR) can obtain the presence / absence of touch and / or the touch coordinates using the sensed data output from the touch driving circuit (TDC).

The touch display device can detect the touch based on the mutual-capacitance, or can detect the touch based on the self-capacitance.

When touch is detected based on the mutual-capacitance, a plurality of touch electrodes TE arranged in the touch panel TSP may be arranged in a matrix form. In this case, each of the touch electrodes TE may be in the form of a bar.

Alternatively, when the touch is sensed based on the mutual-capacitance, the plurality of touch electrodes TE arranged in the touch panel TSP may form touch electrode lines in the row direction and touch electrode lines in the column direction. In this case, each of the touch electrodes TE may be in the form of a diamond, a rectangle, or a square.

The touch driving circuit TDC supplies a driving signal to the touch electrode TE or the touch electrode lines in the row direction (or column direction) and supplies the driving signal to the touch electrode TE or the touch electrode line And generates sensing data based on the received sensing signal and supplies it to the touch controller (T-CTR). The touch controller (T-CTR) senses presence or touch coordinates based on the sensed data.

When the touch is sensed based on the self-capacitance, the touch electrode TE on the touch panel TSP may be an electrode electrically separated from each other.

The touch driving circuit TDC supplies a driving signal to all or a part of the plurality of touch electrodes TE and receives the sensing signal from the touch electrode TE supplied with the driving signal, And supplies it to the touch controller (T-CTR). The touch controller (T-CTR) senses presence or touch coordinates based on the sensed data.

As described above, the touch display device according to the embodiments of the present invention can detect the touch based on the self-capacitance or the touch based on the mutual-capacitance. Hereinafter, for the sake of convenience of explanation, the touch detection based on the self-capacitance will be described as an example.

The touch panel TSP may be manufactured separately from the display panel DISP and bonded to the display panel DISP. That is, the touch panel TSP can be enclosed in the display panel DISP.

Alternatively, the touch panel TSP may be embedded in the display panel DISP. In this case, a plurality of touch electrodes TE and a plurality of touch lines TL are embedded in the display panel DISP. That is, in the process step of manufacturing the display panel DISP, a plurality of touch electrodes TE and a plurality of touch lines TL can be formed.

The touch driving circuit (TDC) and the data driving circuit (DDC) may be integrated and implemented.

FIG. 3 is a diagram showing a display panel DISP in which a touch panel TSP is embedded in a touch display device according to the embodiments of the present invention.

When the touch panel TSP is embedded in the display panel DISP, the plurality of touch electrodes TE arranged in the touch area of the display panel DISP may be a common electrode used for driving the display. In this case, for example, the display panel DISP may be of various types such as a liquid crystal display panel, an organic light emitting display panel, and the like.

Therefore, a common voltage may be applied to the plurality of touch electrodes TE for image display, and a driving signal may be applied to all or a part of the plurality of touch electrodes TE for touch sensing.

On the other hand, the display panel DISP may be an organic light emitting display panel. In this case, the plurality of touch electrodes TE and the plurality of touch lines TL are disposed on the encapsulation layer disposed on the common electrode on the front surface of the display panel DISP, to which a common voltage is applied .

Here, the common electrode disposed on the display panel DISP as the organic light emitting display panel includes, for example, an anode electrode (corresponding to a pixel electrode) of an organic light emitting diode (OLED) in each subpixel SP ) And the cathode electrode, and the common voltage may be the cathode voltage.

In this case, each of the plurality of touch electrodes TE may be in the form of an electrode without an opening. At this time, each of the plurality of touch electrodes TE may be a transparent electrode for light emission in the sub-pixels SP.

Alternatively, each of the plurality of touch electrodes TE may be a mesh-type electrode having a plurality of openings. At this time, each opening in each of the plurality of touch electrodes TE may correspond to a light emitting region of the subpixel SP (for example, a region where a part of the anode electrode is located).

On the other hand, with respect to the touch electrode size, the area of each of the plurality of touch electrodes TE may overlap with the area of two or more sub-pixels SP.

That is, the area size of one touch electrode TE may correspond to the area size of two or more subpixels SP.

One touch electrode TE may be overlapped with two or more gate lines GL.

One touch electrode TE and two or more gate lines GL are insulated from each other.

One touch electrode TE may be overlapped with two or more data lines DL.

One touch electrode TE and two or more data lines DL are insulated from each other.

2 and 3, the plurality of touch lines TL are insulated from each other in the touch panel TSP.

Referring to FIGS. 2 and 3, the plurality of touch lines TL may be arranged in the same direction as the plurality of data lines DL.

In this case, the data lines DL parallel to the touch line TL have an influence on the touch electrode TE arranged in the same direction. That is, the voltage state of the data lines DL parallel to the touch line TL affects the voltage state of the touch electrode TE arranged in the same direction.

Alternatively, the plurality of touch lines TL may be arranged in the same direction as the plurality of gate lines GL.

In this case, the gate lines GL parallel to the touch line TL have an influence on the touch electrode TE arranged in the same direction. That is, the voltage state of the gate lines GL parallel to the touch line TL affects the voltage state of the touch electrode TE arranged in the same direction.

4 is a time-division driving timing diagram of the touch display device according to the embodiments of the present invention.

Referring to FIG. 4, the touch display device according to the embodiments of the present invention can perform display driving and touch driving at different time zones.

That is, the touch display device according to the embodiments of the present invention can perform the display driving and the touch driving in a time division manner. This driving method is referred to as a time division driving method.

The touch display apparatus according to embodiments of the present invention may use a synchronization signal (TSYNC) to distinguish the display driving period from the touch driving period.

For example, in the synchronization signal TSYNC, a first level (e.g., a high level or a low level) indicates a display driving period, and a second level (e.g., a low level or a high level) .

During the touch driving period, all or a part of the plurality of touch electrodes TE is applied with the driving signal TDS.

During the display driving period, the plurality of touch electrodes TE may be floated, grounded, or a specific DC voltage may be applied.

If the touch electrode TE also serves as a common electrode for driving the display, the touch electrode TE is supplied with the common voltage Vcom for the display driving during the display driving period, TDS).

The driving signal TDS applied to the touch electrode TE during the touch driving period may be a DC voltage, but it may be a signal whose voltage level is changed. When the drive signal TDS is a signal whose voltage level is changed, the drive signal TDS may be referred to as a modulation signal, a pulse signal, an AC signal, or the like.

Meanwhile, during the touch driving period, while the driving signal TDS is applied to the touch electrode TE, which may be a common electrode, the touch electrode TE may form parasitic capacitance with other peripheral electrodes. This parasitic capacitance can degrade the touch sensitivity.

Therefore, during the touch driving period, while the driving signal TDS is applied to the touch electrode TE, which may be a common electrode, the touch display device applies the load-free driving signal LFD ). ≪ / RTI >

The load-free driving signal LFD may be a driving signal TDS or a signal corresponding to at least one of a frequency, a phase, a voltage polarity, an amplitude, etc. with the driving signal TDS.

The other electrodes in the periphery of the touch electrode TE may be a data line, a gate line, or another touch electrode, or the like, but may also be all electrodes or signal wiring in the periphery.

During the touch driving period, while the driving signal (TDS) is applied to the touch electrode (TE), one or more data lines located in the periphery of the touch electrode (TE) or all the data lines in the display panel The signal LFD_DATA can be applied.

During the touch driving period, while the driving signal (TDS) is applied to the touch electrode (TE), one or more gate lines located around the touch electrode (TE) or all the gate lines in the display panel The signal LFD_GATE can be applied.

During the touch driving period, while the driving signal TDS is applied to the touch electrode TE, at least one touch electrode TE located in the periphery of the touch electrode TE or all the remaining touch electrodes TE can be applied with the load-free driving signal LFD_Vcom.

In the case where the touch display device according to the embodiments of the present invention is driven by the time division driving method, since the frame time is divided into the display driving period and the touch driving period, the display driving time may be short.

Such a shortage of the display driving time may cause a situation where a capacitor for image display (e.g., a capacitor between a pixel electrode and a common electrode) can not be charged as required.

When the touch display device according to the embodiments of the present invention is driven by the time division driving method, not only the display driving time is short but also the touch driving time is short, so that the touch sensing speed and accuracy can be lowered.

In addition, when the touch display device according to the embodiments of the present invention is driven by the time division driving method, a disadvantage in which a power integration circuit for generating the driving signal TDS and the load-free driving signal LFD is separately required have.

Therefore, the touch display device according to the embodiments of the present invention may simultaneously perform the display driving and the touch driving in a driving method different from the time division driving method.

In order to simultaneously perform the display driving and the touch driving according to the embodiments of the present invention, the driving operation must be performed so that there is no bad influence between the display driving and the touch driving. The time-free driving method for this will be described in detail below.

5 is a time-pre-driving timing diagram of the touch display device according to the embodiments of the present invention.

Referring to FIG. 5, the touch display device according to the embodiments of the present invention may simultaneously perform display driving and touch driving. This driving method is called time free driving (TFD).

Therefore, the touch display device according to the embodiments of the present invention may not require the synchronization signal TSYNC for distinguishing between the display driving period and the touch driving period.

The touch display apparatus according to the embodiments of the present invention can perform display driving and touch driving during the active time defined by the vertical synchronization signal Vsync and the blank time when performing the time free driving . Here, one active time may correspond to one display frame time.

Accordingly, when performing the time-free driving, the touch display device according to the embodiments of the present invention may include a plurality of gate lines GL for display driving during the active time defined by the vertical synchronization signal Vsync A data voltage for displaying an image can be supplied to the data lines DL while being sequentially driven and at the same time a driving signal TDS can be supplied to the plurality of touch electrodes TE for touch driving.

Accordingly, the touch display device according to the embodiments of the present invention can perform a driving operation in a time-free driving mode, thereby sensing a touch by a finger and / or a pen while displaying an image through a display drive.

Meanwhile, the touch display device according to the embodiments of the present invention may simultaneously perform display driving and touch driving at all frame times (i.e., all active times).

Alternatively, the touch display device according to the embodiments of the present invention may perform only the display driving at a certain frame time (active time) and simultaneously perform the display driving and the touch driving at some other frame time (active time) , And may perform only touch driving at some frame time (active time), as the case may be.

Meanwhile, the touch display device according to the present invention supplies a driving signal TDS having a voltage level varying during an active time to the touch electrode TE, and a driving signal having a variable voltage level even during a blank time TDS) can be supplied to the touch electrode TE (Case 1).

Alternatively, the touch display device according to embodiments of the present invention may float the touch electrode TE, supply the DC voltage, or supply a specific reference voltage (e.g., ground voltage) during the blank time (Case 2 ). This can be applied to the case where the blank time is used as a special time for driving the pen touch or the like.

As described above, when the touch display device performs the display driving and the touch driving simultaneously with the time pre-driving method, it is possible to prevent the display driving time from becoming insufficient due to the touch driving. Therefore, it is possible to realize a high resolution while sensing the touch.

FIG. 6 is a diagram illustrating a ground environment of the touch display device according to the embodiments of the present invention, and FIG. 7 is a timing diagram of a time-free driving time during ground modulation in the touch display device according to the embodiments of the present invention.

Referring to FIG. 6, the touch display device according to the embodiments of the present invention has two grounds GND1 and GND2.

The touch controller T-CTR, the display controller D-CTR and the like can be grounded to the first ground GND1 of the two grounds GND1 and GND2.

The display panel DISP and the like can be grounded to the second ground GND2 of the two grounds GND1 and GND2.

The touch driving circuit TDC that receives signals between the touch controller T-CTR grounded at the primary ground GND1 and the display panel DISP grounded at the secondary ground GND2 is connected to the primary ground GND1, And the second ground GND2.

The data driving circuit DDC that sends and receives signals between the display controller D-CTR grounded to the primary ground GND1 and the display panel DISP grounded to the secondary ground GND2 is connected to the primary ground GND1, And the second ground GND2.

The primary ground GND1 may be a ground wiring or a ground electrode disposed on the display panel DISP or an external structure such as an external cover of the display panel DISP or a wiring or an electrode disposed on the external structure . The secondary ground GND2 may be a ground wiring or a ground electrode disposed on the display panel DISP or an external structure such as an external cover of the display panel DISP or a wiring or an electrode disposed on the external structure .

Referring to FIG. 6, the touch display apparatus according to embodiments of the present invention may further include a ground modulation circuit (GMC) for performing ground modulation.

The ground modulation circuit GMC controls the ground voltage Vgnd1 of the first ground GND1 and the second ground voltage Vgnd2 of the second ground GND2 in comparison with the ground voltage The modulation processing can be performed.

Referring to FIG. 6, the secondary ground voltage Vgnd2 of the secondary ground GND2 may be regarded as a ground voltage modulated relative to the primary ground voltage Vgnd1 of the primary ground GND1.

The primary ground voltage Vgnd1 of the primary ground GND1 may be regarded as a modulated ground voltage with respect to the secondary ground voltage Vgnd2 of the secondary ground GND2.

That is, when looking at the secondary ground voltage Vgnd2 based on the primary ground voltage Vgnd1, the secondary ground voltage Vgnd2 appears as a modulated signal (modulated ground voltage) whose voltage level is variable. Looking at the primary ground voltage Vgnd1 based on the secondary ground voltage Vgnd2, the primary ground voltage Vgnd1 appears as a modulated signal (modulated ground voltage) whose voltage level is variable.

The driving signal TDS applied to the touch electrodes TE in the display panel DISP is grounded by grounding the display panel DISP to the secondary ground GND2 having the secondary ground voltage Vgnd2 in the form of a modulated signal, Can swing like a secondary ground voltage Vgnd2.

As described above, the touch display device can stably perform the display driving and the touch driving at the same time by using the two grounds (GND1, GND2) in the time-free driving method.

The touch display apparatus is driven in a time-free manner and the display driving and the touch driving are simultaneously performed so that the driving signal TDS is applied to one or more of the plurality of touch electrodes TE, A voltage can be applied.

In this case, the driving signal TDS applied to at least one of the plurality of touch electrodes TE is generated by the second ground voltage Vgnd2 of the secondary ground GND2 to which the display panel DISP is grounded, One or more of signal characteristics such as voltage polarity and amplitude can be handled.

On the other hand, when the plurality of touch electrodes TE are divided common electrodes to which a common voltage used for the display driving is applied, the driving signal TDS applied to at least one of the plurality of touch electrodes TE is necessary for driving the display Or may be the common voltage Vcom.

When the touch display device according to the embodiments of the present invention simultaneously performs the display driving and the touch driving according to the time pre-driving method and the plurality of touch electrodes TE also serve as the common electrode, the driving signal TDS And the common voltage Vcom can be considered to be the same.

Referring to FIG. 7, in the touch display device according to the embodiments of the present invention, a driving signal TDS whose voltage level is varied during a display driving period (that is, during an active time) .

The driving signal TDS supplied to the plurality of touch electrodes TE is a touch driving signal for touch driving and a common voltage Vcom for forming pixel voltages (data voltages) and capacitances for image display.

7, the driving signal TDS applied to the plurality of touch electrodes TE arranged on the display panel DISP is a sum of the second ground voltage GND2 of the second ground GND2 to which the display panel DISP is grounded (Vgnd2), frequency, phase, voltage polarity, amplitude, and the like may correspond to each other.

7, the secondary ground voltage Vgnd2 of the secondary ground GND2 to which the display panel DISP is grounded while the display driving and the touch driving are simultaneously performed (that is, during the active time) is ΔV And the voltage level can be varied between V0 and V0 + [Delta] V. The driving signal TDS applied to the touch electrode TE has an amplitude of? V and the voltage level may fluctuate between V1 and V1 +? V.

7, the secondary ground voltage Vgnd2 of the second ground GND2 to which the display panel DISP is grounded and the driving signal TDS applied to the touch electrode TE are frequency, phase, At least one of amplitude, signal polarity and the like may be the same.

However, when the voltage level fluctuates, the high level voltage and the low level voltage may be equal to each other (V0 = V1) or may be different from each other (V0? V1).

7, the vertical synchronization signal Vsync maintains a second level (e.g., a high level or a low level) during the active time and a first level (e.g., a low level or a high level) during the blank time . In this case, the interval between the first level (e.g., low level or high level) can be defined as one display frame.

 Alternatively, the vertical synchronization signal Vsync may maintain a first level (e.g., a low level or a high level) during the active time and a second level (e.g., a high level or a low level) during the blank time. In this case, between two pulses having a second level (e.g., high level or low level) can be defined as one display frame.

FIG. 8 is a view illustrating a touch driving circuit of a touch display device according to embodiments of the present invention. FIG. 9 is a diagram illustrating a touch operation performed by a touch driving circuit (TDC) of a touch display device according to an embodiment of the present invention. And a touch driving operation with respect to the electrode row.

Referring to FIG. 8, a touch driving circuit (TDC) according to embodiments of the present invention includes a first multiplexer circuit MUX1, a sensing unit block SUB including a plurality of sensing units SU, A circuit MUX2, an analog-to-digital converter (ADC), and the like.

The first multiplexer circuit MUX1 may comprise one or more multiplexers. The second multiplexer circuit MUX2 may comprise one or more multiplexers.

Referring to FIG. 8, each sensing unit SU may include a preamplifier (Pre-AMP), an integrator (INTG), and a sample and hold circuit (SHA).

One preamplifier (Pre-AMP) may be electrically connected to one or two or more touch electrodes TE.

For example, as shown in FIG. 9, one preamplifier (Pre-AMP) includes a plurality of touch electrodes TE1, TE2, TE3, TE4, TE5 included in one touch electrode column (TEC: ,...).

Referring to FIG. 9, one preamplifier (Pre-AMP) selects one of two or more connectable touch electrodes TE1, TE2, TE3, TE4, TE5, (For example, TE1) to which the driving signal TDS is applied and the sensing signal from the sensing target touch electrode (for example, TE1) to which the driving signal TDS is applied.

9, the multiplexer MUX included in the first multiplexer circuit MUX1 includes a plurality of touch electrodes TE1, TE2, TE3, TE4, TE5 included in the touch electrode line TEC , And so on, to the preamplifier (Pre-AMP).

That is, the multiplexer MUX connects the node b connected to the preamplifier (Pre-AMP) to the node a1 connected to the selected sensing target touch electrode TE1.

Accordingly, the preamplifier (Pre-AMP) receives the common voltage Vcom corresponding to the driving signal TDS output from the power management integrated circuit (PMIC) through the first input terminal (I1) I2.

The common voltage Vcom output from the second input terminal I2 of the preamplifier Pre-AMP is supplied to the sensing target touch electrode TE1 selected by the multiplexer MUX.

The multiplexer MUX outputs the remaining touch electrode TE1 excluding the touch target electrode TE1 among the plurality of touch electrodes TE1, TE2, TE3, TE4, TE5, ... included in the corresponding touch electrode row TEC (A2, a3, a4, a5, ...) connected to the non-sensing target touch electrodes TE2, TE3, TE4, TE5, And node c directly connected to node c.

Accordingly, the non-sensing target touch electrodes TE2, TE3, TE4, TE5, ... among the plurality of touch electrodes TE1, TE2, TE3, TE4, TE5, ... included in the touch electrode row TEC, ...) can be directly supplied with the common voltage Vcom without going through the preamplifier (Pre-AMP).

Thereafter, the preamplifier (Pre-AMP) can receive the sensing signal from the sensing target touch electrode TE1. The feedback capacitor Cfb is charged by the sensing signal thus received and the signal output to the output terminal O of the preamplifier Pre-AMP can be input to the integrator INTG.

The preamplifier (Pre-AMP) and the integrator (INTG) may be integrated.

The integrator (INTG) integrates the signal output from the preamplifier (Pre-AMP).

The analog-to-digital converter (ADC) can output the touch-sensitive data obtained by converting the integral value output to the integrator INTG into a digital value toward the touch controller (T-CTR).

The analog-to-digital converter (ADC) can output the sensed data to the touch controller (T-CTR) grounded to the primary ground GND1.

The preamplifier Pre-AMP can receive the sensing signal from the touch electrode TE disposed on the display panel DISP grounded to the first ground GND1 and the second ground GND2 which is the other ground. Using this touch driving circuit TDC, the touch sensing signal is received from the touch electrode TE disposed on the display panel DISP which is grounded to the second ground GND2 which is the ground, and the touch sensing signal is applied to the primary ground GND1 By outputting the touch sensing data with the grounded touch controller (D-CTR), it is possible to enable touch sensing in the touch display device having two grounds (GND1, GND2).

Referring to FIG. 8, the touch driver circuit (TDC) according to embodiments of the present invention may further include a signal transfer circuit (STC) for transferring signals to a touch controller (T-CTR). In this case, the signal transfer circuit STC included in the touch driving circuit (TDC) according to the embodiments of the present invention can be grounded to both the primary ground GND1 and the secondary ground GND2.

10 is a diagram illustrating a touch driving operation of a touch panel (TSP) performed by a touch driving circuit (TDC) of a touch display device according to an embodiment of the present invention. 5 is a view for explaining a common voltage ripple (Vcom ripple) phenomenon that occurs as a noise component of the common voltage Vcom during touch-driving of the touch display device, and a touch sensing defect accordingly.

As shown in FIG. 10, nine touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE3-2, and TE3-3) are arranged in the touch area and are arranged in three rows and three columns.

Nine touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) Each of which is connected to at least one touch line TL.

The first touch electrode row TEC # 1 includes three touch electrodes TE 1-1, TE 1-2 and TE 1-3 and the second touch electrode row TEC # (TE 2-1, TE 2-2, TE 3-3), and the third touch electrode row (TEC # 3) includes three touch electrodes (TE 3-1, ).

The touch line direction and the touch electrode column direction correspond to the data line direction.

On the other hand, there may exist three preamplifiers (Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3) corresponding to three touch electrode columns (TEC # 1, TEC # 2 and TEC # 3) .

When driven in a time-free driving mode, the touch driving circuit TDC is driven by nine touch electrodes TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2- TE 1 - 3, TE 3 - 1, TE 3 - 2 and TE 3 - 3) are supplied with the common voltage Vcom and the first multiplexer circuit MUX 1 supplies the nine touch electrodes TE 1-1, 2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) do.

10, the touch electrodes (TE 1-1, TE 2-1, TE 3-1) located in the first row in each of the three touch electrode columns (TEC # 1, TEC # 2, TEC # Is a touch electrode selected as the " sensing target touch electrode " by the first multiplexer circuit MUX1.

The touch electrodes TE 1-2, TE 1-3, TE 2-2, and TE 2 located in the second row and the third row in the three touch electrode columns (TEC # 1, TEC # 2, and TEC # 3) -3, TE 3-2, and TE 3-3 are the touch electrodes selected as the "non-sensing target touch electrodes" by the first multiplexer circuit MUX1.

The touch driving circuit TDC receives the common voltage Vcom output from the power management integrated circuit PMIC through the common voltage buffer BUF.

The touch driving circuit TDC applies the common voltage Vcom output from the common voltage buffer BUF to six non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3).

The touch driver circuit TDC includes three preamplifiers Pre-AMP # 1, Pre-AMP # 2, and Pre-AMP # 3 corresponding to three touch electrode columns TEC # 1, TEC # The common voltage Vcom is supplied to the first input terminal I1.

Thus, the first preamplifiers (Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3) of the three preamplifiers The common voltage Vcom input to the input terminal I1 is output to the second input terminal I2 of the three preamplifiers Pre-AMP # 1, Pre-AMP # 2 and Pre-AMP # 3.

The common voltage Vcom output to the second input terminal I2 of the three preamplifiers (Pre-AMP # 1, Pre-AMP # 2 and Pre-AMP # 3) , TE 2-1, and TE 3-1.

Thereafter, the touch driving circuit TDC applies the common voltage Vcom through the second input terminal I2 of the three preamplifiers Pre-AMP # 1, Pre-AMP # 2 and Pre- And receives sensing signals from the three sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1. The signals output from the output terminal O of the three preamplifiers (Pre-AMP # 1, Pre-AMP # 2, and Pre-AMP # 3) are input to the three integrators INTG.

In this manner, the touch electrodes (TE 1-1, TE 2-1, TE 3-1) located in the first row in each of the three touch electrode rows (TEC # 1, TEC # 2, TEC # 3) TEC # 2, and TEC # 3) through the first multiplexer circuit (MUX1), the touch driver circuit (TDC) The touch electrodes TE 1-2, TE 2-2, and TE 3-2 located on the second row of the touch electrodes TE 1, TE 2-2, TE 3-2 are selected as the "touch target electrodes" 1, TE 1-3, TE 2-1, TE 2-3, TE 3-1, TE 3-3) is selected as the non-sensing target touch electrode, and the above-described touch driving operation is repeated .

Thus, the touch electrodes (TE 1-2, TE2-2, TE3-2) positioned in the second row in each of the three touch electrode rows (TEC # 1, TEC # 2, TEC # 3) TEC # 2, and TEC # 3) through the first multiplexer circuit (MUX1), the touch driver circuit (TDC) The touch electrodes TE 1-3, TE 2-3, and TE 3-3 located on the third row of the touch electrodes TE 1 to TE 3 are selected as the "touch target electrodes to be sensed" 1, TE 1-2, TE 2-1, TE 2-2, TE 3-1, TE 3-2) is selected as the non-sensing target touch electrode, and the above-described touch driving operation is repeated .

In this manner, the touch electrodes (TE 1-3, TE 2-3, TE 3-3) located in the third row in each of the three touch electrode rows (TEC # 1, TEC # 2 and TEC # 3) Target touch electrode " is completed, the detection of the entire area of the display panel (DISP) in which the touch panel (TSP) is built is completed.

Accordingly, the touch controller (T-CTR) can calculate the touch presence or touch coordinates in the entire region of the display panel DISP based on the touch sensation data generated and output from the touch drive circuit (TDC) .

As described above with reference to FIG. 10, the common voltage Vcom is simultaneously applied to the sensing target TE and the non-sensing target TE during the touch driving operation .

The common voltage Vcom applied to the sensing target touch electrode is a driving signal for touch sensing. The common voltage Vcom applied to the non-sensing target touch electrode may be a load-free driving signal for preventing unnecessary parasitic capacitance from being formed between the sensing target touch electrode and the non-sensing target touch electrode.

In the case of the time-free driving method, the common voltage Vcom applied to all the touch electrodes TE including the touch target electrodes to be sensed and the touch electrodes to be non-sensing is applied to the pixel electrodes in each sub- And the voltage that forms the pixel voltage and the capacitance.

On the other hand, referring to FIGS. 10 and 11, when the display driving and the touch driving are simultaneously performed in the time-free driving method, if the common voltage Vcom is not stable and fluctuates, the touch sensitivity and display quality are greatly decreased .

For example, depending on the layout structure of the touch electrodes TE, the touch lines TL and the data lines DL, the driving method, etc., The common voltage Vcom applied to the electrodes TE may fluctuate.

When such a change in the common voltage Vcom occurs, ripple (hereinafter referred to as common voltage ripple Vcom Ripple) may be generated as a noise component in the signal waveform of the common voltage Vcom.

The common voltage Vcom applied to the plurality of touch electrodes TE in accordance with the time pre-driving method is a modulated signal in which the voltage level is changed, but the signal waveforms shown in Figs. 10 and 11 are DC The common voltage ripple Vcom Ripple is generated in the positive direction and the negative direction in the common voltage Vcom of the voltage.

As shown in FIG. 11, when common voltage ripple Vcom Ripple is generated, undesirable fluctuations also occur in sensed data (touch sensed data), resulting in a poor touch sensing.

In addition, generation of the common voltage ripple (Vcom ripple) affects the display operation as well as the touch detection failure, and may cause display related defects such as crosstalk.

Accordingly, the touch display device according to the embodiments of the present invention is capable of driving the touch electrode TE serving as the common electrode in a time-free driving manner by the common voltage ripple that may be generated in the touch electrode TE The deterioration of the touch sensitivity and the display quality can be prevented.

The touch driving method and the touch driving structure capable of preventing the touch sensitivity and the display quality from being deteriorated due to the common voltage ripple that may be generated in the driving operation of the touch display device according to the embodiments of the present invention, Will be described with reference to FIG.

FIG. 12 is a diagram schematically illustrating a touch driving structure capable of preventing a decrease in touch sensitivity and display quality due to a common voltage ripple that may be generated in a driving operation of the touch display device according to the embodiments of the present invention.

Referring to FIG. 12, the touch display device according to the embodiments of the present invention includes a touch panel TSP having a plurality of touch electrodes TE arranged in a touch region, and a touch panel TSP And a touch driving circuit (TDC).

Here, the touch panel TSP may be embedded in the display panel DISP.

During the first time period, the plurality of touch electrodes TE may include at least one sensing target TE selected for the first time period and at least one sensing target TE excluding one or more sensing target TEs And may be classified as a non-sensing target TE.

Here, the first time period may be a touch driving period in which the touch driving for touch sensing proceeds.

The first time period may be a period during which the display driving progresses according to the driving method.

In the case of driving by the time division driving method, the first time period may be a touch driving period in which display driving is not performed.

In the case of driving in the time-free driving mode, the first time period may be a touch driving period that is performed together with the display driving. In this case, during the first time period, an image can be displayed on the display panel DISP.

A touch driving circuit (TDC) of a touch display device according to embodiments of the present invention includes a system and structure for supplying a driving signal to a non-sensing target TE, a sensing target TE ) Are different from each other.

During the first time period, the touch driving circuit TDC supplies the driving signal TDS to one or more non-sensing target electrodes TE. Here, in the case of the time-free driving method, the driving signal TDS corresponds to the common voltage Vcom. Therefore, in the following, the drive signal TDS is used as the common voltage Vcom.

During the first time period, the touch driving circuit TDC supplies the reception signal FB Vcom received from the touch panel TSP as a driving signal to at least one sensing target TE.

The touch driving circuit TDC can detect a sensing signal from at least one sensing target TE to which the reception signal FB Vcom received from the touch panel TSP is applied.

12, the reception signal FB Vcom received from the touch panel TSP by the touch driving circuit TDC is input to the first input terminal I1 of the preamplifier Pre-AMP and is input to the second input terminal I2 ) To the sensing target touch electrode (Sensing Target TE) in the touch panel (TSP).

When there is a ripple in the received signal FB Vcom received from the touch panel TSP, the same ripple may also exist in the signal FB Vcom applied to the sensing target touch electrode Sensing Target TE.

A touch driving circuit (TDC), which is a signal detection circuit for touch sensing, receives a reception signal FB Vcom having a common voltage ripple from a touch panel (TSP) and applies it to a sensing target touch electrode, The influence of the common voltage ripple can be minimized by causing the touch driving circuit (TDC) to swing in the same phase and size even when the common voltage ripple occurs during the time free driving.

Hereinafter, two touch driving structures capable of reducing the influence of the common voltage ripple will be described with reference to FIGS. 13 and 14. FIG.

13 is a diagram illustrating a first touch driving structure for preventing touch sensitivity due to a common voltage ripple that may be generated during a driving operation of the touch display device according to the exemplary embodiments of the present invention and degradation of display quality.

As shown in FIG. 13, nine touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE3-2, and TE3-3) are arranged in the touch area and are arranged in three rows and three columns.

Nine touch electrodes (TE 1-1, TE 1-2, TE 1-3, TE 2-1, TE 2-2, TE 2-3, TE 3-1, TE 3-2, TE 3-3) Each of which is connected to at least one touch line TL.

The first touch electrode row TEC # 1 includes three touch electrodes TE 1-1, TE 1-2 and TE 1-3 and the second touch electrode row TEC # (TE 2-1, TE 2-2, TE 3-3), and the third touch electrode row (TEC # 3) includes three touch electrodes (TE 3-1, ).

On the other hand, there may exist three preamplifiers (Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3) corresponding to three touch electrode columns (TEC # 1, TEC # 2 and TEC # 3) .

In the example of FIG. 13, the touch electrodes (TE 1-1, TE 2-1, TE 3-1) located in the first row in each of the three touch electrode columns (TEC # 1, TEC # 2 and TEC # Is a touch electrode selected as the " sensing target touch electrode " by the first multiplexer circuit MUX1 during the first time period. The touch electrodes TE 1-2, TE 1-3, TE 2-2, and TE 2 located in the second row and the third row in the three touch electrode columns (TEC # 1, TEC # 2, and TEC # 3) -3, TE 3-2, and TE 3-3 are selected as the "non-sensing target touch electrodes" by the first multiplexer circuit MUX1 during the first time period.

Referring to FIG. 13, according to the first touch driving structure for reducing the influence of the common voltage ripple, the touch panel TSP includes at least one dummy electrode DE disposed in the outer region of the touch region, One or more supply lines SUPL for supplying a signal to one or more dummy electrodes DE from the at least one dummy electrode DE to at least one dummy electrode DE, (FBL) may be disposed.

Through the structure (DE, SUPL, FBL) described above, the touch driver circuit (TDC) can receive the common voltage ripple from the outer area of the touch panel (TSP).

In the case of the first touch driving structure, the number of feedback lines FBL may be one in the touch panel TSP or may be several.

For example, as shown in FIG. 13, the number of feedback lines FBL may be the same as the number of touch target electrodes TE 1-1, TE 2-1, TE 3-1.

In this first touch driving structure, by arranging the feedback lines FBL by the number of the touch target electrodes TE 1-1, TE 2-1, TE 3-1, the touch target electrodes TE 1-1, TE 2-1, and TE 3-1), it is possible to provide an effective common voltage ripple feedback structure.

On the other hand, when there is one sensing target touch electrode (one of TE 1-1, TE 2-1, TE 3-1) for each touch electrode row (one of TEC # 1, TEC # 2 and TEC # 3) , And the number of feedback lines FBL may be the same as the number of the touch electrode lines TEC # 1, TEC # 2, and TEC # 3.

13, during the first time period, the touch driver circuit (TDC) applies one or more "non-sensing target electrodes TE 1-2, TE 1-3, TE 2 Dummy electrode DE "via one or more supply lines SUPL when supplying the driving signal Vcom to the driving signal" (Vcom) can be supplied.

13, the touch driving circuit TDC feeds back the driving signal Vcom supplied to one or more dummy electrodes DE through one or more feedback lines FBL and receives the feedback driving signal FB Vcom, To the at least one " sensing target touch electrode (TE 1-1, TE 2-1, TE 3-1) ".

13, the touch driving circuit TDC includes at least one preamplifier (Pre-AMP # 1, Pre) corresponding to one or more sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1) -AMP # 2, Pre-AMP # 3).

Each of the preamplifiers (Pre-AMP # 1, Pre-AMP # 2, and Pre-AMP # 3) includes a first input terminal I1 connected to the feedback line FBL, 2-1 and TE3-1 and a second input terminal I2 electrically connected through the touch line TL and an output terminal O for outputting the output signal to the integrator INTG.

The drive signal FB Vcom fed back through the feedback line FBL is received by the touch panel TSP as a reception signal of each preamplifier Pre-AMP # 1, Pre-AMP # 2, Pre- (TE 1-2) through the second input terminal I2 of each of the pre-amplifiers Pre-AMP # 1, Pre-AMP # 2 and Pre- , TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3).

As described above, in the touch display device according to the embodiments of the present invention, the dummy electrode DE is disposed outside the panel, and the non-sensing target electrodes TE 1-2, TE 1-3, TE 2- And the voltage at the dummy electrode DE through the feedback line FBL connected to the dummy electrode DE by making the same driving state and voltage state as that of the dummy electrode DE, 2, TE 2-3, TE 3-2, And supplies the feedback signal FB Vcom to one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1 to generate a touch driving circuit TDC The influence of the common voltage ripple can be minimized by causing the touch driving circuit (TDC) to swing in the same phase and size even when the common voltage ripple occurs during the time free driving.

The touch panel TSP for the first touch driving structure includes a plurality of touch electrodes TE arranged in the touch region, one or more dummy electrodes DE arranged in the outer region of the touch region, And one or more feedback lines (FBL) connected to electrodes DE.

During the first time period, the plurality of touch electrodes TE are connected to one or more touch electrodes TE 1-1, TE 2-1, TE 3-1 selected for the first time period, (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3) other than the touch electrodes (TE 1-1, TE 2-1, TE 3-1) -2, and TE 3-3).

The driving signal Vcom is applied to one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3 during the first time period, And the driving signal Vcom may be supplied to one or more dummy electrodes DE.

A signal corresponding to the signal output from the one or more feedback lines FBL may be supplied to one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1.

According to the above description, it is possible to provide the touch panel (TSP) having the first touch driving structure that can minimize the influence of the common voltage ripple.

FIG. 14 is a diagram illustrating a second touch driving structure for preventing touch sensitivity due to a common voltage ripple that may be generated during a driving operation of the touch display device according to the exemplary embodiments of the present invention, and degradation of display quality.

Referring to FIG. 14, according to the second touch driving structure, one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE One or more feedback lines (FBL) for signal transmission from the input terminals (TE, 3-2, TE 3-3) to the touch driving circuit (TDC).

Through the above structure (DE, SUPL, FBL), the touch driving circuit (TDC) can receive the common voltage ripple from the touch region of the touch panel TSP.

In the case of the second touch driving structure, the number of feedback lines FBL may be one in the touch panel TSP or may be several.

For example, as shown in FIG. 14, the number of feedback lines FBL may be the same as the number of touch target electrodes TE 1-1, TE 2-1, TE 3-1.

In this second touch driving structure, by arranging the feedback lines FBL by the number of the touch target electrodes TE 1-1, TE 2-1, TE 3-1, the touch target electrodes TE 1-1, TE 2-1, and TE 3-1), it is possible to provide an effective common voltage ripple feedback structure.

On the other hand, when there is one sensing target touch electrode (one of TE 1-1, TE 2-1, TE 3-1) for each touch electrode row (one of TEC # 1, TEC # 2 and TEC # 3) , And the number of feedback lines FBL may be the same as the number of the touch electrode lines TEC # 1, TEC # 2, and TEC # 3.

14, during the first time period, the touch driving circuit TDC includes one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3- TE 2 - 3, TE 3 - 2, TE 3 - 3) and supplies the driving signal Vcom to one or more non-sensing target touch electrodes (TE 1-2, TE 1-3, The drive signal Vcom supplied to the selected feedback touch electrode (TE 1-2, TE 2-2, TE 3-2 in the example of FIG. 14) , TE 1-2, TE 2-2, and TE 3-2) through a feedback line (FBL).

The touch driving circuit TDC includes a driving signal FB Vcom which is fed back via a feedback line FBL connected to one or more feedback touch electrodes (TE 1-2, TE 2-2, TE 3-2 in the example of FIG. 14) To the at least one touch target electrodes TE 1-1, TE 2-1, TE 3-1.

14, the touch driving circuit TDC includes at least one preamplifier (Pre) corresponding to one or more sensing target touch electrodes (TE 1-1, TE 2-1, TE 3-1) -AMP # 1, Pre-AMP # 2, Pre-AMP # 3).

Each of the preamplifiers (Pre-AMP # 1, Pre-AMP # 2, and Pre-AMP # 3) includes a first input terminal I1 connected to the feedback line FBL, 2-1 and TE3-1 and a second input terminal I2 electrically connected through the touch line TL and an output terminal O for outputting the output signal to the integrator INTG.

The drive signal FB Vcom fed back via the feedback line FBL is supplied to the respective preamplifiers Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3 And are connected to the first and second input terminals I1 and I2 of the sensing target touch electrodes TE 1 and I2 through the second input terminals I2 of the preamplifiers Pre- AMP # 1, Pre-AMP # -1, TE 2-1, TE 3-1).

As described above, the touch display device according to the embodiments of the present invention includes the non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE (TE 1-1, TE 2-1, TE 3-1) by supplying a feedback signal (FB Vcom) through a feedback line (FBL) connected to a part of the touch screen The influence of the common voltage ripple can be minimized by causing the touch driving circuit (TDC) to swing in the same phase and size even when the common voltage ripple occurs in the time free driving.

The touch panel TSP for the second touch driving structure includes a plurality of touch electrodes TE arranged in the touch area, a plurality of touch lines TL connected to the plurality of touch electrodes TE, And a plurality of feedback lines FBL connected to the touch electrodes TE.

During the first time period, the plurality of touch electrodes TE are connected to one or more touch electrodes TE 1-1, TE 2-1, TE 3-1 selected for the first time period, (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3) other than the touch electrodes (TE 1-1, TE 2-1, TE 3-1) -2, and TE 3-3).

The driving signal Vcom is applied to one or more non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3 during the first time period, And a feedback line (FBL) connected to one of the at least one non-sensing target touch electrode (TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE 3-3) A signal corresponding to the signal FB Vcom output from the touch sensing unit may be supplied to one or more sensing target touch electrodes TE 1-1, TE 2-1, TE 3-1.

According to the above description, it is possible to provide the touch panel (TSP) having the second touch driving structure which can minimize the influence of the common voltage ripple.

On the other hand, the drive signals applied to the non-sensing target electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, and TE 3-3 correspond to the load- And a driving signal fed back from the touch panel TSP to the sensing target touch electrodes TE 1-1, TE 2-1 and TE 3-1 corresponds to a touch driving signal TDS for touch sensing.

When the display driving and the touch driving are simultaneously performed according to the time pre-driving method, the non-sensing target touch electrodes TE 1-2, TE 1-3, TE 2-2, TE 2-3, TE 3-2, TE The driving signals applied to both the sensing target touch electrodes TE 1-1, TE 2-1, and TE 3-1 correspond to the common voltage Vcom required for display, and the voltage levels Lt; / RTI > may be a modulated signal that is changed.

Thus, the driving signals applied to all the touch electrodes TE are a driving signal (touch driving signal, load-free driving signal) related to touch sensing and a common voltage Vcom required for display. Such a driving signal becomes a modulated signal in which the voltage level is changed, so that the display driving and the touch driving can be performed simultaneously.

6 and 7, the secondary ground voltage Vgnd2 of the secondary ground GND2 is applied to the display panel DISP and the secondary ground voltage Vgnd2 is applied to the display panel DISP as the voltage level changes And may have an amplitude and a frequency corresponding to the drive signal Vcom applied to the touch electrode TE.

As described above, by grounding the display panel DISP to the secondary ground GND2 having the secondary ground voltage Vgnd2 in the form of a modulated signal, it is possible to prevent the voltage applied to the touch electrodes TE in the display panel DISP The driving signal TDS can be swung like the secondary ground voltage Vgnd2.

On the other hand, the touch controller (T-CTR) that receives the sensed data from the touch driving circuit (TDC) and calculates the presence or absence of the touch or the coordinates of the touch is connected to the primary ground voltage (Vgnd2) The voltage Vgndl may be applied.

15 is a block diagram of a touch driving circuit (TDC) according to embodiments of the present invention.

Referring to FIG. 15, a touch driving circuit (TDC) according to embodiments of the present invention includes a plurality of touch electrodes TE, one or more sensing target touch electrodes other than a selected one of the plurality of touch electrodes TE, A first driving unit 1510 for supplying a feedback signal FBcom from the touch panel TSP and a feedback signal FBVcom from the touch panel TSP and applying a feedback signal FBVcom to at least one sensing target TE And a second driving unit 1520 for supplying the signal as a signal.

By using the above-described touch driving circuit (TDC), it is possible to prevent deterioration of touch sensitivity and the like even if ripples are generated in the touch electrode TE serving as a common electrode.

13, the first driving unit 1510 applies a driving signal Vcom to at least one non-sensing target electrode of the plurality of touch electrodes TE, The driving signal Vcom is supplied together with the plurality of touch electrodes TE and one or more other dummy electrodes DE.

The second driving unit 1520 supplies the feedback signal FB Vcom received from the at least one dummy electrode DE supplied with the driving signal Vcom to the at least one sensing target touch electrode as a driving signal, .

By using the above-described touch driving circuit (TDC), the feedback signal FB Vcom fed back from the dummy electrode DE located in the outer area of the touch panel TSP is applied to the sensing target touch electrode, The common voltage ripple generated in the dummy electrode DE is generated in the same touch electrode as the sensing target touch electrode so that the touch driving circuit TDC swings to the same phase and size as the dummy electrode DE, Removed or reduced.

The first driver 1510 may include an output buffer BUF, a plurality of amplifiers AMP, and the like in FIG.

The second driving unit 1520 may include a preamplifier (Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3)

14, the first driving unit 1510 applies a driving signal Vcom to at least one non-sensing target electrode of the plurality of touch electrodes TE, ).

The second driving unit 1520 supplies the feedback signal FB Vcom received from one of the at least one non-sensing target touch electrode supplied with the driving signal Vcom to the at least one sensing target touch electrode as a driving signal The detection signal can be detected.

The above-described touch driving circuit (TDC) applies the feedback signal FB Vcom fed back from the non-sensing target touch electrode in the touch region of the touch panel TSP to the sensing target touch electrode, The common voltage ripple generated in the touch panel TSP is generated equally in the touch target electrode so that the touch driving circuit TDC swings to the same phase and size as the touch panel TSP so that the influence of the common voltage ripple on the touch detection is eliminated Or reduced.

The first driver 1510 may include an output buffer BUF and a plurality of amplifiers AMP in FIG.

The second driving unit 1520 may include a preamplifier (Pre-AMP # 1, Pre-AMP # 2, Pre-AMP # 3) in FIG.

The touch driving method described above will be briefly described with reference to Fig.

16 is a flowchart of a driving method according to embodiments of the present invention.

Referring to FIG. 16, a driving method according to embodiments of the present invention includes sensing one or more non-sensing target electrodes (Non-sensing target) except for one or more sensing target TEs among a plurality of touch electrodes TE, a step S1610 of supplying a drive signal Vcom to the sensing target TE from the touch panel TSP, a step S1620 of receiving a feedback signal FB Vcom from the touch panel TSP, And supplying the sensing target TE to at least one sensing target TE (S1630).

By using the above-described driving method, deterioration of touch sensitivity and the like can be prevented even if ripples are generated in the touch electrode TE serving as a common electrode.

As described above, according to the embodiments of the present invention described above, it is possible to provide a touch display device, a touch panel (TSP), a touch driver Lt; RTI ID = 0.0 > (TDC) < / RTI >

According to embodiments of the present invention, a touch display device, a touch panel (TSP), a touch driving circuit (TDC), and a touch screen display device capable of stably performing time- A driving method can be provided.

According to embodiments of the present invention, a touch display device, a touch panel (TSP), a touch driving circuit (TDC), and a display device can minimize influence of ripples generated in a touch electrode serving as a common electrode on touch detection and display, And a driving method.

According to embodiments of the present invention, it is possible to provide a touch display device capable of preventing crosstalk between display and touch due to ripple induced in a touch electrode serving as a common electrode in a circumstance simultaneously performing display driving and touch driving, A panel (TSP), a touch driving circuit (TDC), and a driving method.

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 inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

DISP: Display panel
DDC: Data driving circuit
GDC: Gate drive circuit
D-CTR: Display controller
TDC: Touch driving circuit
T-CTR: Touch Controller

Claims (18)

A touch panel in which a plurality of touch electrodes are disposed in a touch region; And
And a touch driving circuit for driving the touch panel to detect a sensing signal,
During the first time period,
At least one sensing target touch electrode selected for the first time interval,
Sensing target electrodes other than the at least one sensing target touch electrode,
During the first time period, the touch-
Sensing electrodes to be non-sensing target electrodes,
And supplies the received signal received from the touch panel to the at least one touch target electrode to detect the at least one touch target electrode.
The method according to claim 1,
In the touch panel,
At least one dummy electrode arranged in an outer region of the touch region,
At least one supply line for supplying a signal from the touch driving circuit to the at least one dummy electrode,
And at least one feedback line for signal transmission from the at least one dummy electrode to the touch driving circuit is disposed.
3. The method of claim 2,
Wherein the number of the feedback lines is equal to the number of the touch targets to be sensed.
3. The method of claim 2,
During the first time period, the touch-
Supplying the driving signal to the one or more dummy electrodes via the one or more supply lines when supplying the driving signal to the at least one non-sensing target touch electrode,
Wherein the driving signal supplied to the one or more dummy electrodes is fed back via the one or more feedback lines,
And supplies the feedback drive signal to the at least one touch target electrode.
5. The method of claim 4,
The touch-
And at least one preamplifier corresponding to the at least one touch target electrode,
The pre-
A first input coupled to the feedback line,
A second input terminal electrically connected to the sensing target touch electrode through a touch line,
And an output terminal for outputting an output signal,
And the feedback driving signal is input to the first input terminal through the feedback line and is transmitted to the sensing target touch electrode through the second input terminal.
The method according to claim 1,
In the touch panel,
Wherein at least one feedback line for signal transmission from the at least one non-sensing target touch electrode to the touch driving circuit is disposed.
3. The method of claim 2,
Wherein the number of the feedback lines is equal to the number of the touch targets to be sensed.
The method according to claim 6,
During the first time period, the touch-
Wherein the driving signal is supplied to the at least one non-sensing target touch electrode,
Wherein the driving signal supplied to the selected one of the at least one non-sensing target touch electrodes is fed back via a feedback line connected to the feedback touch electrode,
And the feedback drive signal is the received signal.
9. The method of claim 8,
The touch-
And at least one preamplifier corresponding to the at least one touch target electrode,
The pre-
A first input coupled to the feedback line,
A second input terminal electrically connected to the sensing target touch electrode through a touch line,
And an output terminal for outputting an output signal,
Wherein the feedback drive signal is input to the first input terminal as the reception signal through the feedback line and is transmitted to the sensing target touch electrode through the second input terminal.
The method according to claim 1,
Wherein the touch panel is built in a display panel,
And the image is displayed on the display panel during the first time period.
11. The method of claim 10,
Wherein the drive signal is a modulation signal whose voltage level is changed.
12. The method of claim 11,
A ground voltage is applied to the display panel,
Wherein the ground voltage is a modulated signal whose voltage level is changed and has an amplitude and a frequency corresponding to the drive signal.
In the touch panel,
A plurality of touch electrodes disposed in a touch region;
At least one dummy electrode disposed in an outer region of the touch region; And
And at least one feedback line coupled to the at least one dummy electrode,
During the first time period,
At least one sensing target touch electrode selected for the first time interval,
Sensing target electrodes other than the at least one sensing target touch electrode,
During the first time period,
A driving signal is supplied to the at least one non-sensing target touch electrode, a driving signal is supplied to the at least one dummy electrode,
And a signal corresponding to the signal output from the at least one feedback line is supplied to the at least one touch electrode to be sensed.
In the touch panel,
A plurality of touch electrodes disposed in a touch region;
A plurality of touch lines connected to the plurality of touch electrodes; And
And a plurality of feedback lines connected to the plurality of touch electrodes,
During the first time period,
At least one sensing target touch electrode selected for the first time interval,
Sensing target electrodes other than the at least one sensing target touch electrode,
During the first time period,
A driving signal is supplied to the at least one non-sensing target touch electrode,
Wherein a signal corresponding to a signal output from a feedback line connected to one of the at least one non-sensing target touch electrodes is supplied to the at least one sensing target touch electrode.
A touch driving circuit for driving a touch panel in which a plurality of touch electrodes are disposed in a touch region,
A first driving unit for supplying a driving signal to at least one non-sensing target touch electrode other than the at least one sensing target touch electrode among the plurality of touch electrodes; And
And a second driving unit for receiving a feedback signal from the touch panel and supplying the feedback signal as the driving signal to the at least one touch target electrode.
16. The method of claim 15,
Wherein the first driving unit comprises:
When the driving signal is supplied to the at least one non-sensing target touch electrode among the plurality of touch electrodes,
And supplying the driving signal to one or more dummy electrodes different from the plurality of touch electrodes,
The second driving unit includes:
And supplies the feedback signal received from the at least one dummy electrode supplied with the driving signal to the at least one sensing target touch electrode as the driving signal.
17. The method of claim 16,
Wherein the first driving unit comprises:
And supplying the driving signal to the at least one non-sensing target touch electrode among the plurality of touch electrodes,
The second driving unit includes:
And supplies the feedback signal received from one of the at least one non-sensing target touch electrode supplied with the driving signal to the at least one sensing target touch electrode as the driving signal.
A driving method for driving a touch panel in which a plurality of touch electrodes are disposed in a touch region,
Supplying a driving signal to at least one non-sensing target touch electrode other than the at least one sensing target touch electrode among the plurality of touch electrodes;
Receiving a feedback signal from the touch panel; And
And supplying the feedback signal to the at least one touch target electrode as the driving signal.

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