KR20190024548A - Touch display device, driving method, and driving circuit - Google Patents

Abstract

Embodiments of the present invention relate to a touch display device, a driving method, and a driving circuit and, more specifically, to a touch display device, a driving method, and a driving circuit capable of simultaneously performing display driving and touch driving and enabling the touch sensitivity not affected by display driving by supplying a data voltage to a plurality of data lines arranged on a display panel, supplying a common voltage to a plurality of common electrodes arranged on a display panel, displaying an image through a display panel, sensing touch based on at least one signal detected from a plurality of common electrodes, and supplying a common voltage, which is a modulation signal synchronized to a data voltage or a modulation signal synchronized to a data synchronization signal synchronized to a data voltage, with common electrodes.

Description

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

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

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.

Since the touch display device must provide both a video display function and a touch sensing function, it is necessary to divide the driving time such as the frame time into the display driving period and the touch driving period, perform display driving in the display driving period, And performs touch driving and touch sensing in the subsequent touch driving period.

In the case of the above-described time division driving method, in order to progress the display driving and the touch driving in time division, 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 has been a problem in that high resolution image quality can not be provided due to time division driving.

In view of the foregoing, it is an object of embodiments of the present invention to provide a touch display device, a driving method, and a driving circuit capable of simultaneously performing display driving and touch driving.

It is another object of embodiments of the present invention to provide a touch display device, a driving method, and a driving circuit that prevent touch sensitivity from being affected by display driving.

It is another object of embodiments of the present invention to provide a touch display device, a driving method, and a driving circuit capable of performing touch detection without being influenced by data driving.

Another object of the embodiments of the present invention is to provide a touch display device, a driving method, and a driving circuit capable of preventing a touch detection from being deteriorated or a touch sensitivity from being deteriorated even if a voltage state of a data voltage is changed There is.

It is still another object of embodiments of the present invention to provide a touch display device, a driving method, and a driving circuit that can prevent touch detection from being deteriorated or decrease in touch sensitivity in a specific display pattern.

It is still another object of embodiments of the present invention to provide a touch display device, a driving method, and a driving circuit capable of preventing display touch crosstalk that simultaneously performs display driving and touch driving, .

Embodiments of the present invention are directed to a liquid crystal display device having a plurality of data lines and a plurality of gate lines arranged, a plurality of sub-pixels arranged by a plurality of data lines and a plurality of gate lines arranged, It is possible to provide a touch display device including a display panel having a plurality of pixels.

The touch display device supplies a data voltage to a plurality of data lines and supplies a common voltage, which is a modulation signal synchronized with a data voltage or a modulation signal synchronized with a data synchronization signal synchronized with a data voltage, to a plurality of common electrodes And a first circuit for detecting a signal from at least one of the plurality of common electrodes.

The touch display device may include a second circuit that senses a touch based on the signal detected in the first circuit.

The common voltage may be a modulated signal whose voltage level is swung.

The common voltage may be changed in voltage level after a predetermined delay time at the first state change point of the data voltage or the data synchronization signal.

The common voltage is set to a second state change point or a second state change point of the data voltage or the data sync signal after the voltage level is first changed after the predetermined delay time at the first state change point of the data voltage or the data sync signal The secondary voltage level can be changed again at a point earlier by the predetermined control time.

With regard to the voltage level change of the common voltage, the delay time associated with the primary voltage level is constant and the control time associated with the secondary voltage level can be varied.

The common voltage can be constant in frequency.

The common voltage may vary in duty cycle or duty ratio.

The touch display apparatus may further include a pulse modulation circuit for outputting a pulse modulation signal and a ground modulation circuit for outputting a ground voltage modulated in accordance with the pulse modulation signal.

The common voltage may correspond to the modulated ground voltage.

The common voltage may have a frequency and phase corresponding to the frequency and phase of the modulated ground voltage.

The pulse modulated signal can be synchronized to the data voltage or the data synchronization signal.

The ground modulation circuit may include a first ground voltage, which is a DC voltage, and a power supply separation circuit, for separating the second ground voltage, which is a modulated ground voltage and an AC voltage.

The display panel and the second circuit can be grounded to different ground voltages.

The second circuit may be grounded to a first ground voltage which is a DC voltage.

The display panel may be grounded to a second ground voltage which is an AC voltage.

The first circuit may be grounded to both a first ground voltage, which is a DC voltage, and a second ground voltage, which is an AC voltage.

The first circuit may include a circuit that separates the first ground voltage and the second ground voltage.

The data synchronization signal may be a data drive control signal supplied by the timing controller to the first circuit.

Alternatively, the data synchronization signal may be a gate drive control signal supplied from the timing controller to the gate drive circuit.

The image displayed through the display panel is a display pattern in the inversion mode while the common voltage, which is a modulation signal synchronized with the data voltage or a modulation signal synchronized with the data synchronization signal synchronized with the data voltage, is supplied to the plurality of common electrodes .

Embodiments of the present invention are directed to a liquid crystal display device having a plurality of data lines and a plurality of gate lines arranged, a plurality of sub-pixels arranged by a plurality of data lines and a plurality of gate lines arranged, The method comprising the steps of:

The driving method includes the steps of supplying a data voltage to a plurality of data lines, supplying a common voltage, which is a modulation signal synchronized with a data voltage to a plurality of common electrodes, or a modulation signal synchronized with a data synchronization signal synchronized with a data voltage And displaying the image through the display panel and sensing a touch based on a signal detected from at least one of the plurality of common electrodes.

The driving method may further include generating a ground voltage, which is a modulation signal corresponding to the frequency and the phase of the common voltage, prior to the step of supplying the data voltage and the common voltage.

Embodiments of the present invention are directed to a liquid crystal display device having a plurality of data lines and a plurality of gate lines arranged, a plurality of sub-pixels arranged by a plurality of data lines and a plurality of gate lines arranged, It is possible to provide a driving circuit of a touch display device including a display panel.

The driving circuit includes a first driving circuit for supplying a data voltage to a plurality of data lines and a common voltage which is a modulation signal synchronized with a data voltage or synchronized with a data synchronizing signal synchronized with a data voltage, And a second driving circuit for detecting a signal for touch detection from at least one of the plurality of common electrodes.

Embodiments of the present invention are directed to a liquid crystal display device having a plurality of data lines and a plurality of gate lines arranged, a plurality of sub-pixels arranged by a plurality of data lines and a plurality of gate lines arranged, It is possible to provide a touch display device including a display panel having a plurality of pixels.

The touch display device includes a first circuit that supplies a common voltage to a plurality of common electrodes and detects a signal from at least one of the plurality of common electrodes, and a second circuit that, based on the detected signal, And a second circuit for sensing the touch.

The common voltage is a modulation signal in which the voltage level swings, and the voltage level can be changed at a timing when the voltage level of the data voltage is unchanged.

In embodiments of the present invention, a plurality of data lines and a plurality of gate lines are arranged, a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, It is possible to provide a touch display device including a display panel having a plurality of pixels.

The touch display device includes a first circuit that supplies a data voltage to a plurality of data lines, supplies a touch driving signal to the plurality of touch electrodes, and detects a signal from at least one of the plurality of touch electrodes .

Such a touch display apparatus can provide a touch display apparatus including a second circuit for sensing a touch based on a detected signal while an image is displayed through a display panel.

The display panel may be grounded at a modulated ground voltage with a predetermined frequency.

The touch driving signal may be a modulated signal whose voltage level swings.

The touch drive signal may have a frequency and phase corresponding to the frequency and phase of the modulated ground voltage.

The voltage level of the touch driving signal can be changed at the timing when the voltage level of the data voltage is unchanged.

According to the embodiments of the present invention described above, it is possible to provide a touch display device, a driving method, and a driving circuit capable of simultaneously performing display driving and touch driving.

According to the embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit that prevent the touch sensitivity from being affected by the display driving.

According to embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit capable of performing touch sensing without being affected by data driving.

According to the embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit capable of preventing touch detection from being deteriorated or deterioration of touch sensitivity even if the voltage state of the data voltage is changed .

According to embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit that can prevent touch detection from being deteriorated or decrease in touch sensitivity in a specific display pattern.

According to embodiments of the present invention, there is provided a touch display device, a driving method, and a driving circuit capable of preventing a display touch crosstalk in which a touch related signal is distorted by simultaneously driving a display drive and a touch driving .

1 and 2 are system configuration diagrams of a touch display apparatus according to embodiments of the present invention.
FIG. 3 is a view illustrating a case where a display panel of a touch display device according to embodiments of the present invention includes a touch screen panel.
4 is a diagram illustrating time division driving of a touch display apparatus according to embodiments of the present invention.
FIG. 5 is a diagram illustrating time-free driving of a touch display apparatus according to embodiments of the present invention.
6 is a diagram illustrating asynchronization between a data voltage and a common voltage in a time pre-driving of the touch display device according to the embodiments of the present invention.
FIG. 7 is a diagram illustrating a voltage fluctuation phenomenon occurring in a common electrode according to a state change of a data voltage when an asynchronous state occurs between a data voltage and a common voltage in the touch display device according to the embodiments of the present invention.
FIG. 8 is an illustration of an image pattern generating a display touch crosstalk according to a voltage fluctuation phenomenon at a common voltage in a touch display apparatus according to embodiments of the present invention.
9 is a view for explaining a touch signal distortion phenomenon by a display touch crosstalk according to a voltage fluctuation phenomenon at a common voltage in a touch display apparatus according to embodiments of the present invention.
FIG. 10 and FIG. 11 are diagrams illustrating the synchronization between the data voltage and the common voltage in the time-pre-driving of the touch display device according to the embodiments of the present invention.
12A is a diagram for explaining signal control of a common voltage when the touch-display device is time-driven in accordance with the embodiments of the present invention.
12B are examples of a display drive control signal that can be utilized as a data synchronization signal for synchronizing a common voltage to a data voltage in a touch display device according to embodiments of the present invention.
13 is a diagram illustrating two ground voltages and a ground modulation circuit for using them in the touch display device according to the embodiments of the present invention.
14 is a diagram showing a ground modulation circuit in the touch display device according to the embodiments of the present invention.
FIG. 15 is a configuration diagram for performing a ground modulation function for data synchronization of a common voltage, which is a touch driving signal, in the touch display device according to the embodiments of the present invention.
16 is an exemplary diagram of a power supply separation circuit in a touch display device according to embodiments of the present invention.
17 is a flowchart of a method of driving a touch display apparatus 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 apparatus 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, in order to provide a video display function, a touch display apparatus according to embodiments of the present invention includes a plurality of data lines DL and a plurality of gate lines GL, A display panel DISP in which a plurality of subpixels SP defined by data lines DL and a plurality of gate lines GL are arranged, A circuit SDC, a gate driving circuit GDC for driving the plurality of gate lines GL, a timing controller TCON for controlling the source driving circuit SDC and the gate driving 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 timing controller TCON supplies various drive control signals DCS and GCS to the source drive circuit SDC and the gate drive circuit GDC to control the source drive circuit SDC and the gate drive circuit GDC .

The timing controller TCON starts scanning in accordance with the timing to be implemented in each frame and switches the input image data inputted from the outside according to the data signal format used in the source driving circuit SDC, Data), and controls the data drive at the appropriate time according to the scan.

The above timing controller TCON includes a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input data enable (DE) signal, a clock signal CLK and the like in addition to the input video data And receives various timing signals from the outside (e.g., the host system).

In addition to outputting the converted video data by switching the input video data inputted from the outside in accordance with the data signal format used in the source driving circuit SDC, the timing controller TCON outputs a video signal, A timing signal such as a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input DE signal and a clock signal is generated to control the circuit GDC and generates various driving control signals to control the source driving circuit SDC, And the gate driving circuit GDC.

For example, the timing controller TCON controls a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GSC) GOE: Gate Output Enable), and the like.

Here, the gate start pulse GSP controls the operation start timing of one or more gate driver integrated circuits constituting the gate drive circuit GDC. The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies the timing information of one or more gate driver ICs.

The timing controller TCON includes a source start pulse SSP, a source sampling clock SSC and a source output enable signal SOE to control the source driving circuit SDC. And Source Output Enable) and the like.

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the source driving circuit SDC. The source sampling clock SSC is a clock signal for controlling sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the source driving circuit SDC.

The timing controller TCON may be a control device including a timing controller to perform other control functions.

The timing controller TCON may be implemented as a separate component from the source driver circuit SDC or may be integrated with the source driver circuit SDC and implemented as an integrated circuit.

The source driving circuit SDC receives the video data Data from the timing controller TCON and supplies the data voltages to the plurality of data lines DL to drive the plurality of data lines DL. Here, the source driver circuit SDC is also referred to as a data driver circuit.

Such a source driver circuit (SDC) may be implemented including at least one source driver integrated circuit (SDIC).

Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit (SDIC) may further include an analog to digital converter (ADC), as the case may be.

Each source driver integrated circuit (SDIC) is connected to a bonding pad of a display panel (DISP) by a tape automated bonding (TAB) method or a chip on glass (COG) method , And may be disposed directly on the display panel DISP or, 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 driving circuit GDC sequentially supplies the scan signals to the plurality of gate lines GL to sequentially drive the plurality of gate lines GL. Here, the gate drive circuit GDC is also referred to as a scan drive circuit.

The gate driving circuit GDC may be implemented by including at least one gate driver integrated circuit (GDIC).

Each gate driver circuit integrated circuit GDIC may include a shift register, a level shifter, and the like.

Each gate driver IC GDIC 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 by a GIP (Gate In Panel) type And may be disposed directly on the display panel DISP, or 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 driving circuit GDC sequentially supplies a scan signal of an On voltage or an Off voltage to the plurality of gate lines GL under the control of the timing controller TCON.

The source driving circuit SDC converts the video data DATA received from the timing controller TCON into an analog data voltage when a specific gate line is opened by the gate driving circuit GDC, DL.

The source driver circuit SDC may be located only on one side (e.g., on the upper side or the lower side) of the display panel DISP and 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 depending on the driving system, the panel design method, For example, left and right).

2, the touch display device according to embodiments of the present invention includes a touch screen panel (TSP), a touch driving circuit (TDC), and a micro control unit (MCU) to provide a touch sensing function can do.

The touch screen panel TSP may include a plurality of touch electrodes TE and a plurality of signal lines SL electrically connected to the plurality of touch electrodes TE.

For example, one touch electrode TE may be electrically connected to one or more signal lines SL through one or more contact holes or the like.

The touch driving circuit TDC drives the touch screen panel TSP to generate and output sensing data (touch row data).

For example, the touch driving circuit TDC supplies a touch driving signal to all or a part of a plurality of touch electrodes TE disposed on the touch screen panel TSP, detects a signal from at least one touch electrode TE, (Touch Raw Data) to generate and output sensing data (Touch Raw Data).

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

The micro control unit (MCU) can obtain the presence / absence of touch and / or the touch coordinates using the sensing data output from the touch driving circuit (TDC).

The touch display device according to the embodiments of the present invention may detect the touch based on the self-capacitance or may detect 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 screen panel TSP may be manufactured separately from the display panel DISP and bonded to the display panel DISP or may be embedded in the display panel DISP.

When the touch screen panel TSP is embedded in the display panel DISP, the touch screen panel TSP can be regarded as a collection of a plurality of touch electrodes TE and a plurality of signal lines SL.

The touch driving circuit (TDC) and the micro control unit (MCU) are two circuits for touch sensing. The touch driving circuit (TDC) is also referred to as a first circuit, and the micro control unit (MCU) is also referred to as a second circuit.

The touch driving circuit (TDC) and the source driving circuit (SDC) may be integrally implemented. In this case, an integrated driving circuit including both the touch driving circuit (TDC) and the source driving circuit (SDC) is also referred to as a first circuit.

3 is a diagram illustrating a case where the display panel DISP of the touch display apparatus according to the embodiments of the present invention includes a touch screen panel TSP.

When the touch screen panel TSP is embedded in the display panel DISP, a plurality of common electrodes COM disposed on the display panel TSP can be utilized as a plurality of touch electrodes TE.

Therefore, a common voltage may be applied to a plurality of common electrodes COM for displaying an image, and a touch driving signal may be applied to all or a part of a plurality of common electrodes COM for touch sensing.

The area of each of the plurality of common electrodes COM may overlap with the area of two or more sub-pixels SP.

That is, the area size of one common electrode COM may correspond to the area size of two or more sub-pixels SP.

Accordingly, two or more gate lines GL can pass through the region of one common electrode COM.

According to the above description, it is possible to control the speed, efficiency, or performance of the touch driving and the touch sensitivity by adjusting the size of the common electrode COM.

FIG. 4 is a diagram illustrating time division driving of a touch display apparatus according to embodiments of the present invention, and FIG. 5 is a diagram illustrating time-free driving of a touch display apparatus according to embodiments of the present invention.

The touch display device according to the embodiments of the present invention can perform a driving operation in a time division driving (Time Division Driving) and / or a time free driving (Time Free Driving).

Referring to FIG. 4, the touch display device according to the embodiments of the present invention provides a display drive and a touch sensing function for providing a video display function when performing a driving operation in a time division driving (Time Division Driving) Can be performed in the time-divided display driving period and the touch driving period, respectively.

The display driving period and the touch driving period can be controlled in timing by the touch synchronizing signal TSYNC.

During the display driving period, a common voltage VCOM which is a DC voltage may be applied to the plurality of common electrodes COM.

During the touch driving period, the touch driving signal LFD of the AC voltage (modulation signal) may be applied to all or a part of the plurality of common electrodes COM. At this time, the touch driving signal LFD or a corresponding signal may be applied to all or a part of the data lines DL. The touch driving signal LFD or a corresponding signal may be further applied to all or a part of the gate lines GL.

Referring to FIG. 5, the touch display apparatus according to embodiments of the present invention provides a display drive and a touch sensing function for providing a video display function when performing a driving operation in a time free driving manner Can be performed simultaneously. Such a time-free driving method is also referred to as a simultaneous driving method.

One frame time may correspond to one active time and one blank time.

When the touch display device according to the embodiments of the present invention performs a driving operation in a time free driving mode, the data voltage VDATA is supplied to the data line DL during the active time at every frame time At this time, the common voltage VCOM serving as the touch driving signal LFD can be supplied to the plurality of common electrodes COM.

Meanwhile, the touch display device according to the embodiments of the present invention can always perform the driving operation in the time division driving mode, the driving operation in the time free driving mode at all times, The driving operation may be performed using both the time division driving method and the time free driving method.

Hereinafter, a case in which the touch display device according to the embodiments of the present invention performs a driving operation in a time free driving manner will be described as an example.

When the touch display device according to the embodiments of the present invention performs a driving operation in a time free driving mode, the plurality of common electrodes COM may be viewed as a plurality of touch electrodes TE, The voltage VCOM can be regarded as the touch driving signal LFD.

FIG. 6 is a diagram showing the asynchronization between the data voltage VDATA and the common voltage VCOM during the time pre-driving of the touch display device according to the embodiments of the present invention, (COM) according to the state change of the data voltage (VDATA) in the asynchronous state between the common electrode (VCOM) and the common electrode (VCOM).

7 shows a state of the data voltage VDATA in a state where a DC voltage is applied to the common electrode COM in order to examine the voltage state variation of the common electrode COM due to the state change of the data voltage VDATA. And a voltage fluctuation occurs in the common electrode COM when a change occurs.

Referring to FIG. 6, in the time-pre-driving of the touch display apparatus according to the embodiments of the present invention, the data line DL is divided into a data voltage VDATA applied to the pixel electrode, The common voltage VCOM applied to the common electrodes COM may have different frequencies and may not be synchronized with each other.

Referring to FIGS. 6 and 7, in the specific pattern of the inversion method, the data voltage VDATA may undergo a state transition in which the voltage level greatly varies.

Therefore, as shown in FIG. 7, the common electrode COM to which the DC voltage is applied is not maintained in the DC voltage state, but the voltage state is fluctuated at the time of the state change of the data voltage VDATA. .

When the voltage of the data voltage VDATA rises, that is, when the data voltage VDATA rises, the common electrode COM, to which the DC voltage has been applied, instantaneously becomes higher instantaneously at the corresponding DC voltage, A voltage state change to return to a voltage may occur.

When the voltage of the data voltage VDATA is lowered, that is, when the data voltage VDATA is falling, the common electrode COM to which the DC voltage is applied is instantaneously lowered instantaneously from the corresponding DC voltage, Lt; RTI ID = 0.0 > a < / RTI >

As described above, when the voltage state of the common electrode COM acting as the touch electrode TE changes due to the change of the data voltage VDATA, the common electrode COM applied with the common voltage VOM May also be distorted.

Accordingly, the touch driving circuit (TDC) detects the distorted signal to generate sensed raw data, and the micro control unit (MCU) senses the sensed raw data generated based on the distorted signal, And / or the touch coordinates using the touch screen, so that the presence or absence of the touch and the touch coordinates can not be detected or may be misinterpreted. That is, a touch detection error may occur or the touch sensitivity may be lowered.

As described above, the voltage state of the common electrode COM acting as the touch electrode TE changes according to the change of the state of the data voltage VDATA, Referred to as a touch crosstalk (DTX).

8 is an illustration of an image pattern generating a display touch crosstalk according to the voltage fluctuation phenomenon in the common voltage VCOM in the touch display device according to the embodiments of the present invention, In the touch display device according to the embodiments of the present invention, the touch signal distortion phenomenon is explained by the display touch crosstalk according to the voltage fluctuation phenomenon in the common voltage VCOM.

The state change of the data voltage VDATA capable of generating the display touch crosstalk and thus the voltage state change of the common electrode COM can be caused by the specific display pattern.

For example, when driving an image with an inversion method, display touch crosstalk may occur.

Examples of the inversion method capable of generating the display touch crosstalk include a frame inversion method, a line inversion method, a column inversion method, or a dot inversion method Dot Inversion) method, and there is also a Z-Inversion method.

Here, the frame inversion method, the line inversion method, and the column inversion method can reduce the power consumption as compared with the dot inversion method, but the image quality degradation problem such as the occurrence of crosstalk phenomenon or the difference in vertical luminance . On the other hand, in the case of the dot inversion method, it is possible to reduce the image quality degradation problem as described above, and thus it is possible to provide images of higher image quality than the frame inversion method, the line inversion method and the column inversion method. However, the dot inversion method has a problem in that the power consumption is too high as compared with the line inversion method or the column inversion method.

Referring to FIG. 8, the Z-in version scheme is an inversion scheme for improving the problem of the other inversion schemes described above. In the inversion scheme, the transistors and the pixel electrodes are arranged in the data lines arranged alternately to the left and right, A method of supplying a data voltage in a version manner.

Referring to FIG. 8, the Z-in version scheme is an improved structure of a column-type version scheme. In the circuit driving scheme, a column-type version scheme is used. However, ), And the screen display is implemented in the same manner as the dot inversion system. Described in detail, the Z-in version system has an effect similar to that of the dot inversion system in image quality, but also uses a version system in the column of data in terms of data, .

When the image is driven in the Z-in version mode, that is, when the Z-inversion display pattern is displayed, the state change of the data voltage VDATA may be generated more severely than in the inversion mode. As a result, the voltage state change of the common electrode COM more severely occurs, and the display touch crosstalk can be more seriously generated.

The change in the state of the data voltage VDATA does not occur very seriously when the image is driven in the Z-inversion mode, but can occur seriously in a specific display pattern.

9A, 9B and 9C, each of the sub-pixel connection markers 910, 920, and 930 is a sub-pixel connected to the same data line DL in the Z- Respectively.

9 (a), 9 (b) and 9 (c), for convenience of explanation, the data voltage VDATA corresponding to 255 gradations is represented by 8 (positive) and 0 , And the data voltage (VDATA) corresponding to the 0 gradation is represented by 3.9 or 4.1.

The raw data (Touch Raw Data) is sensed data obtained by the touch driving circuit (TDC) and includes sensed values for each position. In FIGS. 9A, 9B and 9C, Raw Data) is a representation of the height of the sensing value for each position on the plane by height.

9A, when the red subpixel column, the green subpixel column, and the blue subpixel column are all turned on to represent white (255, 255, 255), for example, The voltage difference of the data voltage VDATA supplied to the sub-pixels 910 connected to the data line DL becomes 0 [V]. That is, the state change of the data voltage VDATA does not occur.

Accordingly, in the touch raw data (Touch Raw Data) obtained by the touch driving circuit (TDC), the sensing value 912 at a position where the touch actually occurs has a different size from the sensing values at other positions. Therefore, in the case of FIG. 9A, the touch can be accurately detected.

Referring to FIG. 9B, in order to represent red (255, 0, 0), for example, only the red subpixel row is turned on and the green subpixel row and the blue subpixel row are turned off The voltage difference of the data voltage VDATA supplied to the sub pixels 920 connected to the same data line DL may be 3.9 V or -3.9 V or may be 0 V have.

The sum of the voltage differences of the data voltage VDATA in one line (one subpixel row) becomes 0 [V].

However, in some columns (sub-pixel columns) 921, the data voltage VDATA changes from 3.9 [V] to -3.9 [V] or from -3.9 [V] to 3.9 [V].

That is, in some columns (sub-pixel columns) 921, the voltage state change width of the data voltage VDATA is 7.8 [V], and the voltage state change of the data voltage VDATA occurs very much.

Accordingly, in the touch raw data (Touch Raw Data) obtained by the touch driving circuit (TDC), the sensing value 922 at a position where the touch actually occurs has a size similar to the sensing values at other positions. Therefore, in the case of FIG. 9 (b), the touch can not be detected at some column positions.

9C, for example, when the red subpixel row is turned on, the green subpixel row is turned off, and the blue subpixel row is turned on (255, 0 , 255) or when the red subpixel sequence is off, the green subpixel sequence is on and the blue subpixel sequence is off (0, 255, 0) The voltage difference of the data voltage VDATA supplied to the subpixels 930 connected to the subpixel 930 may be 3.9 [V] or -3.9 [V].

Therefore, in all the columns (sub-pixel columns) 931, the data voltage VDATA is changed from 3.9 V to -3.9 V or from -3.9 V to 3.9 V.

That is, in all the columns (sub-pixel columns) 931, the voltage state change width of the data voltage VDATA is 7.8 V, and the voltage state change of the data voltage VDATA occurs very much.

In the example of FIG. 9C, the sum of the voltage differences of the data voltage VDATA in one line (one subpixel row) is 23.4 V or -23.4 V.

Therefore, the voltage difference sum of the data voltage VDATA between the lines is largely changed from 23.4 [V] to -23.4 [V], and can be largely changed from 23.4 [V] to -23.4 [V]. This means that the voltage state of the common voltage VCOM applied to the common electrode COM largely fluctuates.

Accordingly, in the touch raw data (Touch Raw Data) obtained by the touch driving circuit (TDC), the sensing value 932 at a position where the touch is actually generated has a similar size to the sensing values at other positions do. Therefore, in the case of Fig. 9C, the touch can not be detected.

As described above, a voltage state change of the common electrode COM corresponding to the touch electrode TE occurs due to the change of the state of the data voltage VDATA. This means that the common electrode COM corresponding to the touch electrode TE is affected by the data line DL.

As a result, the touch sensitivity may decrease or a display touch crosstalk (DTX) may occur.

Therefore, even when the voltage state of the common electrode COM corresponding to the touch electrode TE changes due to the change of the data voltage VDATA in the data line DL, the touch sensitivity of the touch panel It is possible to provide a driving method capable of eliminating the display touch crosstalk.

That is, the embodiments of the present invention can provide a driving method that minimizes the influence of the common electrode COM corresponding to the touch electrode TE by the data line DL.

FIGS. 10 and 11 are diagrams showing the synchronization between the data voltage VDATA and the common voltage VCOM in the time pre-driving of the touch display device according to the embodiments of the present invention.

In the case where the touch display device according to the embodiments of the present invention performs a driving operation in a time-pre-driving manner, the source driving circuit SDC supplies data voltages (DL) to a plurality of data lines And the touch driving circuit TDC can supply the common voltage VCOM to the plurality of common electrodes COM.

The plurality of common electrodes COM are display drive-related electrodes that correspond to pixel electrodes to form an electric field, and are touch electrodes (TE) for touch sensing.

Accordingly, the common voltage VCOM applied to the plurality of common electrodes COM is a display driving voltage and a touch driving signal LFD.

This common voltage VCOM may be a modulated signal synchronized with the data voltage VDATA or a modulated signal synchronized with the data synchronizing signal SYNCON.

Here, the data synchronization signal SYNCON may be a signal synchronized with the data voltage VDATA.

On the other hand, the touch driving circuit TDC can detect a touch sensing signal from at least one of the plurality of common electrodes COM, and generate sensed data (Touch Raw Data) based on the sensed signal And output it.

The micro control unit (MCU) receives sensing data (touch row data) from the touch driving circuit (TDC), and can determine the touch presence and / or touch coordinates using the received sensing data.

On the other hand, the source driver circuit SDC may be implemented by one or more source driver integrated circuits. The touch driving circuit (TDC) may be implemented by one or two or more touch driving integrated circuits.

Further, the source driver integrated circuit implementing the source driver circuit (SDC) and the touch driver integrated circuit implementing the touch driver circuit (TDC) may be integrated and integrated into an integrated driver integrated circuit.

That is, the touch display device according to embodiments of the present invention may include one or more integrated driving integrated circuits, and each integrated driving integrated circuit may include a source driving integrated circuit and a touch driving integrated circuit.

The common voltage VCOM which may be the touch driving signal LFD is synchronized with the data voltage VDATA or the data synchronizing signal SYNCON so that the state of the data voltage VDATA in the data line DL Even if the voltage state of the common electrode COM corresponding to the touch electrode TE changes due to the change, the touch sensitivity does not decrease and the display touch crosstalk can be removed. That is, the influence of the common electrode COM corresponding to the touch electrode TE by the data line DL can be minimized.

Referring to FIG. 11, the common voltage VCOM, which is the touch driving signal LFD, may be a modulated signal whose voltage level swings.

The common voltage VCOM is an AC voltage signal whose voltage level changes and is a pulse signal including a plurality of pulses.

The common voltage VCOM may be a modulated signal in which the width, amplitude, phase, or the like of the pulse is changed.

For example, the common voltage VCOM may be one of a PAM (Pulse Amplitude Modulation) signal, a PWM (Pulse Width Modulation) signal, a PPM (Pulse Position Modulation) signal, a PFM (Pulse Frequency Modulation)

In the following description, it is assumed that the common voltage VCOM is a PWM (pulse width modulation) signal.

11, the common voltage VCOM changes in a first order after the predetermined delay time T1 at the first state change point of the data voltage VDATA or the data synchronization signal SYNCON , It can be changed from Low Level to High Level).

Here, at the first state change point, the data voltage VDATA is changed from the first level (e.g., low level) to the second level (e.g., high level), and the data synchronization signal SYNCON is changed to the second level : High level) to a first level (e.g., low level).

Referring to Fig. 11, the common voltage VCOM is changed in voltage level after a predetermined delay time T1 at the first state change point of the data voltage VDATA or the data synchronization signal SYNCON, The secondary voltage level is changed again at a point that is earlier than the second state changing point of the voltage VDATA or the data synchronizing signal SYNCON by a predetermined control time (T2, T2 is 0 or more) , Change from high level to low level).

Here, at the second state change point, the data voltage VDATA is changed from the second level (e.g., high level) to the first level (e.g., low level), and the data synchronization signal SYNCON is changed to the second level : High level) to a first level (e.g., low level).

According to the above description, it is possible to avoid a period in which unnecessary voltage fluctuations (e.g., instantaneous peak voltages) are generated in the common electrode COM in accordance with the state change of the data voltage VDATA (Low level < - & Since the high level voltage of the touch driving signal LFD corresponding to the voltage VCOM is applied to the common electrode COM, it is possible to prevent the touch sensitivity from being lowered by changing the state of the data voltage VDATA.

As described above, the common voltage VCOM, which is a modulation signal synchronized with the data voltage VDATA or a modulation signal synchronized with the data synchronization signal SYNCON synchronized with the data voltage VDATA, is applied to the common electrodes COM The image displayed through the display panel DISP may be an inversion display pattern.

As described above, generation of display touch crosstalk can be prevented through synchronization between the data voltage VDATA and the common voltage VCOM in a display pattern in which display touch crosstalk is likely to occur.

12A is a diagram for explaining signal control of the common voltage VCOM during time-pre-driving of the touch display device according to the embodiments of the present invention.

12A, the common voltage VCOM serving as a load-free driving signal during time-free driving is (1) a first state change point (a) of the data voltage VDATA or the data synchronization signal SYNCON (For example, a high level) is maintained for a predetermined time (W) after the predetermined delay time T1, and the voltage level is changed (for example, (3) The voltage level is changed secondarily (for example, from the high level to the low level) at a point earlier by the control time T2 than the second state change point b of the data voltage VDATA or the data synchronization signal SYNCON can be changed.

Here, in the common voltage VCOM, the time W during which the high level is maintained corresponds to the pulse width of the common voltage VCOM. The pulse width W of the common voltage VCOM corresponds to the touch sensing time (touch driving time).

The signal waveform relationship between the data synchronization signal SYNCON / data voltage VDATA and the common voltage VCOM is synchronized with the data synchronization signal SYNCON or the data voltage VDATA to change the voltage level of the common voltage VCOM The delay time T1 associated with the change in the primary voltage level of the common voltage VCOM (e.g., low level -> high level) may be constant.

As described above, the common voltage VCOM can be a modulated signal having a constant frequency as the delay time T1 associated with the change in the primary voltage level of the common voltage VCOM is constant.

The signal waveform relationship between the data synchronizing signal SYNCON / data voltage VDATA and the common voltage VCOM can be regarded as a control time related to the secondary voltage level change (for example, high level -> low level) of the common voltage VCOM (T2) can be varied.

The control time T2 associated with the secondary voltage level change of the common voltage VCOM corresponds to the time for which the pulse width W of the common voltage VCOM can be controlled.

As the control time T2 is varied, the pulse width W of the common voltage VCOM can be varied. Here, the pulse width W of the common voltage VCOM is a temporal length of the high level interval, which may mean a touch sensing time (touch driving time). The variation of the pulse width W may affect the touch driving (touch sensing).

As described above, as the pulse width W of the common voltage VCOM is varied, the common voltage VCOM can have a constant frequency and a duty cycle or a duty ratio can be varied.

Here, the duty cycle of the common voltage VCOM is the ratio of the touch sensing on time W to one period (= touch sensing on time W + touch sensing off time T1 + T2) of the common voltage VCOM . &Lt; / RTI &gt; The duty ratio may mean a ratio of the touch sensing on (W) to the touch sensing off time (T1 + T2).

Referring to Fig. 12A, the pulse width W of the common voltage VCOM can be widened to the point b.

On the other hand, in the touch display device, various kinds of noise may occur. In order to normally perform the display driving and the touch driving without being influenced by the noise, the frequency of the common voltage VCOM, which is a modulation signal It can be helpful.

However, in the case of the time-free driving method in which the display driving and the touch driving are simultaneously performed, it is necessary that the common voltage VCOM be synchronized with the data voltage VDATA or the data synchronizing signal SYNCON. In this case, ) Is limited in the frequency variable.

Therefore, as described above, varying the duty cycle or the duty ratio of the common voltage VCOM while maintaining the frequency of the common voltage VCOM enables noise avoidance, thereby improving the display performance and the touch performance.

Taking this into consideration, the adjustment of the duty cycle or the duty ratio of the common voltage VCOM through the variation of the pulse width W of the common voltage VCOM can be adaptively adjusted according to the noise level.

The noise level can be evaluated based on the magnitude of the signal measured at the touch electrode TE of the display panel DISP.

For example, in the touch display device, a reference size of a signal measured by the touch electrode TE is stored in advance when there is no touch, and a reference size of a signal from the touch electrode TE when there is no touch The size of the sensed signal is compared with the stored reference size, and the noise level can be evaluated according to the degree of the difference.

For example, the larger the difference value of the touch display device, the higher the noise level is. The touch display apparatus can increase the duty cycle or the duty ratio of the common voltage VCOM as the evaluated noise level becomes larger and increase the duty cycle or the duty ratio of the common voltage VCOM when the noise level changes frequently Can be changed more frequently.

12B are illustrations of a display drive control signal that can be utilized as a data synchronization signal SYNCON for synchronizing the common voltage VCOM with the data voltage VDATA in the touch display device according to the embodiments of the present invention.

Since the touch display device according to the embodiments of the present invention performs the driving operation in the time-free driving mode, the common voltage VCOM is a display driving-related voltage corresponding to the pixel voltage, and the touch driving signal LFD for touch sensing, It is also.

This common voltage VCOM is synchronized with the data voltage VDATA.

As a result, the common voltage VCOM is changed in voltage level by avoiding the timing at which the voltage value is largely changed in the data voltage VDATA.

For this purpose, the voltage level of the common voltage VCOM can be swung based on the voltage state change timing of the data voltage VDATA.

Alternatively, the voltage level of the common voltage VCOM may be swung based on a signal SYNCON other than the data voltage VDATA, that is, a data synchronization signal SYNCON that is synchronized with the data voltage VDATA.

The data synchronization signal SYNCON is a signal synchronized with the data voltage VDATA and may be a dedicated control signal for controlling the voltage level change timing of the common voltage VCOM.

Alternatively, the data synchronization signal SYNCON can utilize the internal operation control signal for the display drive control as a control signal for controlling the voltage level change timing of the common voltage VCOM.

The internal operation control signal for the display drive control is already synchronized with the voltage state change timing of the data voltage VDATA.

For example, the internal operation control signal used as the data synchronization signal SYNCON may be the data drive control signal DCS supplied from the timing controller TCON to the source drive circuit SDC.

For example, the data driving control signal DCS may include a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, and the like.

As another example, the internal operation control signal used as the data synchronization signal SYNCON may be the gate drive control signal GCS supplied from the timing controller TCON to the gate drive circuit GDC.

For example, the gate drive control signal GCS may be a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, a gate clock signal GCLK, or the like.

As shown in FIG. 12B, the T1 delay time for avoiding the state change timing of the data voltage VDATA may be different depending on the type of the data synchronization signal SYNCON.

As described above, there is an advantage in that an existing internal operation control signal for the display drive control is used as the data synchronization signal SYNCON, so that no separate control signal is used.

Hereinafter, a method of synchronizing the ground modulation function and the common voltage VCOM, which is the touch driving signal LFD, with the data voltage VDATA or the data synchronization signal SYNCON will be described.

13 is a view showing two ground voltages (GND A and GND B) and a ground modulation circuit (GMC) for using them in the touch display device according to the embodiments of the present invention. 14 is a diagram showing a ground modulation circuit (GMC) in the touch display device according to the embodiments of the present invention. 15 is a configuration diagram for performing a ground modulation function for data synchronization of the common voltage VCOM which is the touch driving signal LFD in the touch display device according to the embodiments of the present invention.

The touch display device according to the embodiments of the present invention may utilize two different ground voltages (GND A and GND B).

Various configurations included in the touch display device according to the embodiments of the present invention may be grounded to one or both of two ground voltages GND A and GND B.

Accordingly, the touch display device includes the configurations grounded to the first ground voltage GND A corresponding to the ground voltage GND, the configurations grounded to the second ground voltage GND B, which is the AC voltage, , The first ground voltage (GND A) and the second ground voltage (GND B).

A micro control unit (MCU), a timing control unit (TCON), and the like may be present in the first ground voltage region (GND A Area) which is a region grounded to the first ground voltage (GND A). That is, the micro control unit MCU, the timing control unit TCON, and the like may be grounded to the first ground voltage GND A, which is a DC voltage.

A display panel DISP, a gate drive circuit GDC, a level shifter, and the like may be present in the second ground voltage region GND B Area which is a region grounded to the second ground voltage GNDB. That is, the display panel DISP, the gate drive circuit GDC, the level shifter, and the like can be grounded to the second ground voltage GND B, which is the AC voltage.

The source driving circuit SDC transfers a signal to the display panel DISP which is grounded to the second ground voltage GND B which is the AC voltage and supplies the signal to the timing control unit GND B grounded to the first ground voltage GND A, (TCON) transient signal transmission, it must be grounded to the first ground voltage (GND A), which is a DC voltage, and the second ground voltage (GND B), which is an AC voltage.

The touch driving circuit TDC also transmits a signal to the display panel DISP which is grounded to the second ground voltage GND B which is the AC voltage, It must be grounded to the first ground voltage (GND A), which is a DC voltage, and the second ground voltage (GND B), which is an AC voltage, because it transmits signals to the control unit (MCU).

According to the above description, it is possible to effectively use two ground voltages (GND A and GND B) in one touch display device. Thus, it is possible to simultaneously perform video display and touch detection by performing time-free driving efficiently.

In addition to this, the voltages applied to various electrodes and wirings arranged on the display panel DISP are swung together with the second ground voltage GND B so that the common electrode COM as the touch electrode TE Unnecessary parasitic capacitance is not formed with other electrodes or wirings, and the touch sensitivity can be further improved.

13 to 15, a touch display apparatus according to embodiments of the present invention includes a pulse modulation circuit (PMC) and a ground modulation circuit (GMC) to generate a second ground voltage (GND B) : Ground Modulation Circuit), and the like.

The pulse modulation circuit PMC can output a pulse modulation signal (e.g., PWM) to the ground modulation circuit GMC.

The pulse modulation circuit PMC may be included outside or inside the micro control unit (MCU).

The ground modulation circuit GMC can output the second ground voltage GND B which is the ground voltage modulated in accordance with the pulse modulation signal (for example, PWM) input from the pulse modulation circuit PMC.

When the second ground voltage GND B is generated based on the pulse modulation signal PWM, the ground modulation circuit GMC generates a second ground voltage GND B).

However, when generating the second ground voltage GNDB based on the pulse modulation signal PWM, the ground modulation circuit GMC generates the second ground voltage GNDB at a desired amplitude (GND) regardless of the amplitude Va of the pulse modulation signal PWM The second ground voltage GND B having the first and second ground potentials Vb and Vb.

Therefore, the amplitude Vb of the second ground voltage GND B may be equal to, or less than, or equal to the amplitude Va of the pulse modulation signal PWM.

The ground modulation circuit GMC may include a voltage level changing circuit such as a level shifter.

This ground modulation circuit GMC can generate the second ground voltage GND B based on the pulse modulation signal PWM based on the voltage level of the first ground voltage GND A which is the DC voltage have.

Also, the second ground voltage GND B generated by the ground modulation circuit GMC is not equal to the first ground voltage GND A, Can be seen.

The common voltage VCOM applied to the common electrodes COM serving as the touch electrodes TE may correspond to the second ground voltage GND B that is the modulated ground voltage output from the ground modulation circuit GMC have.

For example, the common voltage VCOM may have a frequency and a phase corresponding to the frequency and phase of the second ground voltage GND B, and the like.

The second ground voltage GND B in the form of an AC signal is generated by using the aforementioned ground modulation circuit GMC and the generated second ground voltage GND B corresponds to the common voltage VCOM, The common voltage VCOM applied to the first power supply lines COM may swing as the modulated second ground voltage GND B.

On the other hand, the common voltage VCOM output from the circuit such as the source driver circuit SDC may be in the form of a DC voltage, but the display panel DISP is grounded to the second ground voltage GND B, The common voltage VCOM applied to the common electrode COM disposed in the first common electrode COM may also show a fluctuated voltage state as the second ground voltage GND B.

In this case, the common voltage VCOM applied to the common electrode COM may have the same or similar signal waveform as the second ground voltage GNDB.

Also, the common voltage VCOM applied to the common electrode COM can be seen as a modulated signal with a voltage of not less than two and a voltage level of more than two, when viewed from the first ground voltage GNDA.

14 and 15, the ground modulation circuit GMC includes a first ground voltage GNDA, which is at least one of power supply voltages VCC and VSS, a ground voltage GND as a DC voltage, (PWM) can be input.

The ground modulation circuit GMC can output one or more modulation power supply voltages VCC_M and VSS_M modulated in accordance with the pulse modulation signal PWM.

The ground modulation circuit GMC can output the second ground voltage GND B which is the ground voltage GND_M modulated in accordance with the pulse modulation signal PWM.

The at least one modulation power supply voltage VCC_M, VSS_M and the second ground voltage GNDB may correspond to the pulse modulation signal PWM.

For example, since at least one of the modulation power supply voltages VCC_M and VSS_M and the second ground voltage GNDB are generated on the basis of the pulse modulation signal PWM, they are the same as the frequency and phase of the pulse modulation signal PWM Frequency and phase, etc., and may have a frequency and a phase that are increased or decreased by a certain ratio in accordance with the frequency and phase of the pulse modulation signal (PWM), and the like.

The ground modulation circuit GMC can output one or more modulation power supply voltages VCC_M and VSS_M and the second ground voltage GNDB to the source drive circuit SDC and / or the touch drive circuit TDC, It may be output to the integrated driving circuit (SRIC) in which the driving circuit SDC and the touch driving circuit TDC are integrated.

According to the above description, the ground modulation circuit GMC can generate and supply the second ground voltage GND B in the form of AC voltage using the pulse modulation signal PWM, And generate and supply one or more modulation power supply voltages VCC_M and VSS_M for use.

On the other hand, referring to FIG. 15, the timing controller TCON can output the data synchronization signal SYNCON to the pulse modulation circuit PMC.

Thus, the pulse modulation circuit PMC can generate and output a pulse modulation signal (e.g., PWM) synchronized with the data synchronization signal SYNCON.

That is, the pulse modulation signal PWM output from the pulse modulation circuit PMC can be synchronized with the data voltage VDATA or the data synchronization signal SYNCON.

As described above, the pulse modulation signal PWM used for ground modulation is synchronized with the data voltage VDATA or the data synchronization signal SYNCON, whereby the second ground voltage GND B modulated according to the pulse modulation signal PWM ) Can also be synchronized to the data voltage VDATA or the data synchronization signal SYNCON. The common voltage VCOM applied to the plurality of common electrodes COM disposed on the display panel DIPS grounded to the second ground voltage GNDB and being the touch driving signal LFD is applied to the second It is shaken like the ground voltage GND B and can be synchronized to the data voltage VDATA or the data synchronization signal SYNCON.

13 and 16, the ground modulation circuit GMC includes a power source separation circuit for separating a first ground voltage GND A in the form of a DC voltage and a second ground voltage GND B in the form of an AC voltage, Function.

To this end, the ground modulation circuit GMC may include a power supply isolation circuit including at least one of a flyback converter, a flyback converter, a transformer, and the like.

Therefore, the touch display device according to the embodiments of the present invention can utilize two different ground voltages (GND A and GND B) as a ground power source.

16 is an exemplary diagram of a power supply separation circuit in a touch display device according to embodiments of the present invention.

16 is an example of a power supply separation circuit, and is a flyback converter.

The flyback converter may include a transformer (TRANS), a switch (SW), a diode (D), and an output capacitor (C).

The switch SW may be electrically connected between the primary winding of the transformer TRANS and the first ground voltage GNDA. The output voltage Vo and the second ground voltage GND B are applied to both ends of the output capacitor C.

When the switch SW is closed, the primary side of the transformer TRANS is directly connected to the input voltage source Vi. The primary current and flux of the transformer (TRANS) increase. Since the voltage of the opposite polarity to the primary winding is induced in the secondary winding of the transformer (TRANS), the voltage induced in the secondary winding becomes negative. As a result, the diode D is reverse biased. That is, the diode D is cut off. Therefore, no current flows through the secondary winding, and current flows only through the primary winding, and energy is stored in the transformer (TRANS). Then, the output capacitor C can supply energy to the power management circuit (PMIC), which is an output load.

When the switch SW is opened, the primary current and the magnetic flux fall off. In the secondary winding, a voltage of the opposite polarity to the previous state is induced. That is, the secondary voltage becomes an anode. As a result, the diode D is forward-biased and conducted, and a transformer (TRANS) current flows. The energy from the transformer TRANS can recharge the capacitor C and power the power management circuit (PMIC), which is the output load.

Transformers (TRANS) can serve not only as a power source for isolation between input and output, but also as an inductor for a filter.

The above-mentioned first ground voltage GND A, second ground voltage GND B, and common voltage VCOM will be described once again.

The first ground voltage GND A may be a DC voltage having a constant voltage while the second ground voltage GND B may be a voltage modulated with respect to the first ground voltage GND A. That is, the voltage level of the second ground voltage (GND B) is not maintained at a constant voltage level with respect to the first ground voltage (GND A), but rather the voltage level, which is a modulation signal, .

The common voltage VCOM applied to the display panel DISP is also modulated so that the second ground voltage GND B is modulated.

That is, the common voltage VCOM can be recognized as being modulated such that the voltage level changes with time as compared with the first ground voltage GNDA.

However, the common voltage VCOM can be regarded as a DC voltage whose voltage level does not change as time changes, as compared to the second ground voltage GND B. That is, the common voltage VCOM is a signal whose voltage level changes with time as viewed from the first ground voltage GND A side. However, when viewed from the second ground voltage GND B side, It may be a signal having a constant voltage level without being changed.

17 is a flowchart of a method of driving a touch display apparatus according to embodiments of the present invention.

Referring to FIG. 17, a method of driving a touch display according to embodiments of the present invention includes supplying data voltages VDATA to a plurality of data lines DL, A step S1730 of displaying an image through the display panel DISP and sensing a touch based on a signal detected from at least one of the plurality of common electrodes COM, And the like.

When the touch display device according to the embodiments of the present invention performs time-free driving (simultaneous driving), the plurality of common electrodes COM may serve as touch electrodes TE.

Accordingly, the common voltage VCOM may be a voltage that forms an electric field with a pixel voltage for image display, and may be a touch driving signal LFD applied to the touch electrode TE for touch sensing.

In order to prevent the display touch crosstalk caused by the change in the state of the data voltage VDATA occurring in a specific display pattern, the common voltage VCOM is a modulation signal synchronized with the data voltage VDATA (a pulse including a plurality of pulses Signal) or a modulated signal (a pulse signal including a plurality of pulses) synchronized with a data synchronizing signal SYNCON synchronized with the data voltage VDATA.

The common voltage VCOM which can be the touch driving signal LFD is synchronized with the data voltage VDATA or the data synchronizing signal SYNCON so that the data voltage VDATA Even if the voltage state of the common electrode COM corresponding to the touch electrode TE changes due to the change of the state of the touch electrode TE, the touch sensitivity does not decrease and the display touch crosstalk can be eliminated. That is, the influence of the common electrode COM corresponding to the touch electrode TE by the data line DL can be minimized.

The display panel DISP may be grounded to the second ground voltage GDN B in the form of an AC signal. Here, the AC signal or the AC voltage described in this specification may include a signal or a voltage in a state where the voltage is not constant over time. Also, the AC signal or the AC voltage may include a signal or voltage whose voltage polarity is changed and whose voltage is not constant, and a signal or voltage whose voltage polarity is not changed and whose voltage is not constant.

Therefore, before the step S1720, the method of driving the touch display apparatus according to the embodiments of the present invention further includes a step of supplying a second ground voltage (GND B), which is a modulation signal corresponding to the frequency and phase of the common voltage VCOM, (S1710). &Lt; / RTI &gt;

As described above, the second ground voltage GND B is generated and the display panel DISP is grounded to the second ground voltage GDN B, thereby applying a voltage to the common electrodes COM disposed on the display panel DISP The common voltage VCOM which is a DC voltage is shaken like the second ground voltage GDN B so that the common voltage VCOM becomes an AC signal which is the same as or similar to the second ground voltage GDNB.

In step S1710, the second ground voltage GNDB is generated in synchronization with the data voltage VDATA or the data synchronization signal SYNCON.

The second ground voltage GND B synchronized with the data voltage VDATA or the data synchronization signal SYNCON is grounded on the display panel DISP so that the common electrodes COM disposed on the display panel DISP The common voltage VCOM which is the applied DC voltage swings like the second ground voltage GDN B so that the common voltage VCOM becomes equal to the data voltage VDATA or the data synchronization signal (SYNCON).

The touch display device according to the embodiments of the present invention includes a plurality of data lines DL and a plurality of gate lines GL arranged therein and a plurality of data lines DL, A display panel DISP in which a plurality of subpixels SP defined by lines DL and a plurality of gate lines GL are arranged and in which a plurality of common electrodes COM are arranged, And a common voltage VCOM which is a modulation signal synchronized with the data voltage VDATA or a modulation signal synchronized with the data synchronization signal SYNCON synchronized with the data voltage VDATA, (For example, SRIC) for detecting a signal from at least one of the plurality of common electrodes COM and supplying the same to the plurality of common electrodes COM, And a second circuit (e.g., an MCU) that senses a touch based on the received signal have.

The first circuit (e.g., SRIC) may include a source driver circuit (SDC) and a touch driver circuit (TDC).

The driving circuit of the touch display device according to the embodiments of the present invention includes a first driving circuit (for example, SDC) for supplying a data voltage VDATA to a plurality of data lines DL, A common voltage VCOM which is a synchronized modulation signal or a modulation signal synchronized with a data synchronization signal SYNCON synchronized with a data voltage VDATA is supplied to a plurality of common electrodes COM, A second driving circuit (e.g., a TDC) that detects a signal for touch detection from at least one of the plurality of touch sensing devices.

The touch display device according to embodiments of the present invention includes a plurality of data lines DL and a plurality of gate lines GL arranged therein and a plurality of data lines DL and a plurality of gate lines GLs A display panel DISP in which a plurality of common electrodes COM are arranged and a plurality of common electrodes COM to supply a common voltage VCOM, A first circuit (e.g., SRIC) that detects a signal from at least one of the plurality of common electrodes COM; and a second circuit (e.g., a second circuit) that detects a touch based on the detected signal while the image is displayed through the display panel DISP Circuitry (e.g., an MCU), and the like.

The voltage level of the common voltage VCOM can be changed at the timing when the voltage level of the data voltage VDATA is unchanged.

The touch display device according to embodiments of the present invention includes a plurality of data lines DL and a plurality of gate lines GL arranged therein and a plurality of data lines DL and a plurality of gate lines GLs A display panel DISP in which a plurality of touch electrodes TE are arranged and a plurality of data lines DL to supply a data voltage VDATA, A first circuit (e.g., SRIC) for supplying a touch driving signal LFD to the plurality of touch electrodes TE and detecting a signal from at least one of the plurality of touch electrodes TE, And a second circuit (MCU) for sensing a touch based on the detected signal while the image is displayed through the second circuit (MCU).

The display panel DISP can be grounded to the modulated second ground voltage GND B with a predetermined frequency.

The touch driving signal LFD may have a frequency and a phase corresponding to the frequency and phase of the modulated second ground voltage GND B as a modulation signal whose voltage level swings.

The touch driving signal LFD may be the same signal as the second ground voltage GNDB.

The voltage level of the touch driving signal LFD may be changed at a timing at which the voltage level of the data voltage VDATA is unchanged.

According to the embodiments of the present invention described above, it is possible to provide a touch display device, a driving method, and a driving circuit capable of simultaneously performing display driving and touch driving.

According to the embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit that prevent the touch sensitivity from being affected by the display driving.

According to embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit capable of performing touch sensing without being affected by data driving.

According to the embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit capable of preventing touch detection from being deteriorated or deterioration of touch sensitivity even if the voltage state of the data voltage is changed .

According to embodiments of the present invention, it is possible to provide a touch display device, a driving method, and a driving circuit that can prevent touch detection from being deteriorated or decrease in touch sensitivity in a specific display pattern.

According to embodiments of the present invention, there is provided a touch display device, a driving method, and a driving circuit capable of preventing a display touch crosstalk in which a touch related signal is distorted by simultaneously driving a display drive and a touch driving .

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
SDC: source driving circuit
GDC: Gate drive circuit
TCON: Timing controller
TSP: Touch screen panel
TDC: Touch-driving circuit
MCU: Micro control unit
TE: touch electrode
COM: common electrode

Claims (26)

A display panel in which a plurality of data lines and a plurality of gate lines are arranged, a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, and a plurality of common electrodes are arranged;
Supplying a common voltage, which is a modulation signal synchronized with the data voltage or a data synchronizing signal synchronized with the data voltage, to the plurality of common electrodes, A first circuit for detecting a signal from at least one of the plurality of common electrodes; And
And a second circuit for sensing a touch based on the detected signal.
The method according to claim 1,
The common-
A modulation signal whose voltage level swings,
Wherein the voltage level is changed after a predetermined delay time at a first state change point of the data voltage or the data synchronization signal.
3. The method of claim 2,
The common-
A voltage level is changed first after a predetermined delay time at a first state change point of the data voltage or the data synchronization signal,
Wherein the second voltage level is changed again at a second state change point of the data voltage or the data sync signal or at a point ahead of the control time determined by the second state change point.
The method of claim 3,
At the first state change point, the data voltage is changed from a first level to a second level, the data synchronization signal is changed from the second level to the first level,
Wherein the data voltage is changed from the second level to the first level and the data synchronization signal is changed from the second level to the first level at the second state change point.
The method of claim 3,
Wherein the delay time is constant and the control time is variable.
The method according to claim 1,
Wherein the common voltage is a modulation signal whose frequency is constant and whose duty cycle or duty ratio is variable.
The method according to claim 1,
A pulse modulation circuit for outputting a pulse modulation signal; And
And a ground modulation circuit for outputting a ground voltage modulated in accordance with the pulse modulation signal,
Wherein the common voltage corresponds to a modulated ground voltage.
8. The method of claim 7,
Wherein the common voltage has a frequency and a phase corresponding to the frequency and phase of the modulated ground voltage.
8. The method of claim 7,
The pulse-
And synchronized with the data voltage or the data synchronization signal.
8. The method of claim 7,
The ground modulation circuit includes:
And a power supply separation circuit for separating a first ground voltage which is a DC voltage and a second ground voltage which is a modulated ground voltage and which is an AC voltage.
8. The method of claim 7,
The ground modulation circuit includes:
At least one power supply voltage, a first ground voltage which is a DC voltage, and the pulse modulation signal,
And outputs one or more modulation power supply voltages modulated according to the pulse modulation signal and outputs a second ground voltage which is a ground voltage modulated according to the pulse modulation signal.
12. The method of claim 11,
The ground modulation circuit includes:
And outputs the at least one modulated power supply voltage to the first circuit.
The method according to claim 1,
The second circuit is grounded to a first ground voltage which is a DC voltage,
Wherein the display panel is grounded to a second ground voltage that is an AC voltage.
The method according to claim 1,
Wherein the first circuit is both grounded to a first ground voltage which is a DC voltage and a second ground voltage which is an AC voltage.
The method according to claim 1,
Wherein the data synchronization signal comprises:
And the timing controller supplies a data driving control signal to the first circuit.
The method according to claim 1,
Wherein the data synchronization signal comprises:
Wherein the timing controller is a gate drive control signal supplied to the gate drive circuit.
The method according to claim 1,
Wherein a region of each of the plurality of common electrodes overlaps with two or more sub-pixel regions.
The method according to claim 1,
Wherein a common voltage, which is a modulation signal synchronized with the data voltage or a modulation signal synchronized with a data synchronization signal synchronized with the data voltage, is supplied to the plurality of common electrodes,
Wherein the image displayed through the display panel is a display pattern of an inversion mode.
A display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, A method of driving a touch display device,
Supplying a data voltage to the plurality of data lines and supplying a common voltage, which is a modulation signal synchronized with the data voltage to the plurality of common electrodes, or a modulation signal synchronized with a data synchronization signal synchronized with the data voltage, ; And
Displaying an image through the display panel, and sensing a touch based on a signal detected from at least one of the plurality of common electrodes.
20. The method of claim 19,
Prior to the feeding step,
And generating a ground voltage as a modulation signal corresponding to the frequency and the phase of the common voltage.
21. The method of claim 20,
Wherein the common voltage is a modulation signal whose frequency is constant and whose duty cycle or duty ratio is variable.
A display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, The driving circuit of the touch display device comprising:
A first driving circuit for supplying a data voltage to the plurality of data lines; And
And supplying a common voltage, which is a modulation signal synchronized with the data voltage or a modulation signal synchronized with a data synchronization signal synchronized with the data voltage, to the plurality of common electrodes, and performs touch detection from at least one of the plurality of common electrodes And a second driving circuit for detecting a signal for driving the light emitting element.
21. The method of claim 20,
Wherein the common voltage is a modulated signal whose frequency is constant and whose duty cycle or duty ratio is variable.
A display panel in which a plurality of data lines and a plurality of gate lines are arranged, a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, and a plurality of common electrodes are arranged;
A first circuit for supplying a common voltage to the plurality of common electrodes and detecting a signal from at least one of the plurality of common electrodes; And
And a second circuit for sensing a touch based on the detected signal while an image is displayed through the display panel,
The common-
As a modulated signal whose voltage level swings,
And the voltage level is changed at a timing when the voltage level of the data voltage is not changed.
A display panel in which a plurality of data lines and a plurality of gate lines are arranged and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged and a plurality of touch electrodes are arranged;
A first circuit for supplying a data voltage to the plurality of data lines, supplying a touch driving signal to the plurality of touch electrodes, and detecting a signal from at least one of the plurality of touch electrodes; And
And a second circuit for sensing a touch based on the detected signal while an image is displayed through the display panel,
Wherein the display panel is grounded to a modulated ground voltage with a predetermined frequency,
The touch-
A modulation signal to which a voltage level swings, having a frequency and a phase corresponding to the frequency and phase of the modulated ground voltage.
26. The method of claim 25,
Wherein the common voltage is a modulation signal whose frequency is constant and whose duty cycle or duty ratio is variable.

Images