KR20170043983A - Signal control circuit, power control circuit, driving circuit, timing controller, touch system, touch display device, and the method for driving the touch display device - Google Patents

Abstract

The embodiments of the present invention relates to a touch technology, and specifically, to a signal control circuit, a power supply control circuit, a driving circuit, a timing controller, a touch system, a touch display device, and a driving method thereof, which can effectively provide touch driving, and prevent unnecessary parasitic capacitance from occurring in all other areas as well as an active area by simply swinging various voltages at a display device during a touch mode section using ground voltage pulses created by swinging ground voltage.

Description

TECHNICAL FIELD [0001] The present invention relates to a signal control circuit, a power supply control circuit, a driving circuit, a timing controller, a touch system, a touch display device and a driving method thereof DRIVING THE TOUCH DISPLAY DEVICE}

The present embodiments relate to a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, a touch system, a touch display device, and a driving method thereof.

2. Description of the Related Art [0002] As an information-oriented society develops, demands for a display device for displaying an image have increased in various forms. Recently, a liquid crystal display device (LCD), a plasma display panel (PDP) Various display devices such as an organic light emitting display (OLED) device are being utilized.

Such a display device 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 order to provide such a touch-based input method, it is necessary to grasp the presence or absence of a user's touch and accurately detect touch coordinates.

For this purpose, the presence or absence of touch and the touch coordinates are calculated based on the capacitance between the touch electrodes or the change in capacitance between the touch electrodes and the pointers of the fingers through a plurality of touch electrodes (for example, transverse electrodes and longitudinal electrodes) A capacitive touch method is often employed.

On the other hand, in touch driving and sensing, unnecessary parasitic capacitance may be formed in addition to the capacitance required for touch sensing.

In the case of the capacitance touch method, unnecessary parasitic capacitance may cause a problem that the load of the touch driving is increased, the accuracy of the touch sensing is lowered, or, in severe cases, the touch sensing itself becomes impossible.

This problem caused by the unnecessary parasitic capacitance can occur more seriously in the case of a display device in which a touch screen panel (TSP) is embedded in a display panel.

It is an object of the present embodiments to provide a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, a touch system, a touch display device and a driving method thereof that can effectively remove parasitic capacitance.

It is another object of the present embodiments to provide a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, a touch controller, and the like which can prevent the generation of parasitic capacitance in all areas including the non- , A touch display device, and a driving method thereof.

Another object of the present invention is to provide a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, and the like, capable of swinging a ground voltage and effectively generating various signals necessary for a touch- , A touch system, a touch display device, and a driving method thereof.

In one aspect, the embodiments of the present invention include a display panel in which a plurality of common electrodes used for touch driving and display driving are arranged, and a common electrode voltage having a pulse width modulated in accordance with a ground voltage pulse corresponding to the inputted pulse width modulation signal A first display voltage pulse and a common electrode voltage pulse of the display voltage pulses are input in a touch mode period and a common electrode voltage pulse is applied to the common electrode voltage pulse, A first driving circuit for sequentially supplying signals to the plurality of common electrodes and a second driving circuit for receiving a second display voltage pulse among the display voltage pulses in a touch mode period, .

In another aspect, the present embodiments provide a method of driving a touch display device in which a plurality of common electrodes used for touch driving and display driving are built in a display panel, the method comprising the steps of: Generating a pulse and a display voltage pulse, and advancing the touch driving using a common voltage pulse during a touch mode period.

In another aspect, the present embodiments provide a plasma display apparatus comprising: a ground voltage input to which a pulse of a pulse having a pulse width modulated is input; and a common electrode, which is synchronized with the ground voltage pulse and pulse width- And a second pulse generator for generating a display voltage pulse synchronized with the ground voltage pulse and pulse width modulated based on the display voltage during a touch mode period, A power supply control circuit can be provided.

In another aspect, the present embodiments provide a touch display device including a pulse generator for generating a ground voltage pulse, and a signal selection circuit for receiving a ground voltage and a ground voltage pulse and selecting and outputting one of a ground voltage and a ground voltage pulse. The signal control circuit of the device can be provided.

In this signal control circuit, the signal selection circuit can select and output the ground voltage pulse during the touch mode period.

According to another aspect of the present invention, there is provided a touch sensing device comprising: a data driving circuit for performing data driving during a display mode period; a touch sensing circuit for sensing a touch sensing signal for touch sensing from a common electrode to which a touch driving signal is applied, The driving circuit of the display device including the sensing signal detection circuit can be provided.

In the driving circuit of such a display device, the touch driving signal may have the same phase as the phase of the ground voltage pulse in the form of a pulse width modulated signal.

According to another aspect of the present invention, there is provided a display device including a mode timing control unit for controlling a display mode and a timing of a touch mode, a video data output unit for outputting video data for data driving during a display mode period, And a signal control circuit for generating a ground voltage pulse in the form of a pulse width modulation signal for swinging a touch-driving signal and a load-free driving signal.

In another aspect, the present embodiments provide a plasma display apparatus comprising: a signal control circuit for generating a ground voltage pulse which is a pulse width modulation signal; a power supply control circuit for generating and outputting a common electrode voltage pulse having the same phase as the ground voltage pulse, And a driving circuit that receives a common electrode voltage pulse and a display voltage pulse in a touch mode period and sequentially supplies a touch driving signal corresponding to the common electrode voltage pulse to a plurality of common electrodes have.

According to the embodiments described above, it is possible to provide a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, a touch system, a touch display device, and a driving method thereof that can effectively remove parasitic capacitance.

In addition, according to the present embodiments, a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, a touch controller, and the like, which can prevent the parasitic capacitance from occurring in all areas including the active area as well as the non- System, a touch display device, and a driving method thereof.

According to the embodiments of the present invention, a signal control circuit, a power supply control circuit, a drive circuit, a timing controller, and the like, capable of swinging the ground voltage and effectively generating various signals necessary for the touch-driving and parasitic capacitance- , A touch system, a touch display device, and a driving method thereof.

1 is a system configuration diagram of a touch display device according to the present embodiments.
2 is a schematic view showing a touch system of a touch display device according to the present embodiments.
3 is a view illustrating a touch screen panel built in a display panel of the touch display device according to the present embodiments.
4 is a diagram illustrating an operation mode of the touch display device according to the present embodiments.
5 is a diagram illustrating a touch driving signal supplied to a common electrode that operates as a touch electrode during a touch mode period of a touch display device according to the present embodiments.
6 is a diagram illustrating parasitic capacitance generated in an active region during a touch mode period of a touch display device according to the present embodiments.
FIG. 7 is a diagram illustrating a load-free operation for preventing parasitic capacitance from occurring in an active region during a touch mode period of a touch display device according to the present embodiments.
8 is a view showing an embodiment of a touch circuit and a driving circuit of the touch display device according to the present embodiments.
9 is a diagram for explaining the system configuration of the touch display device and the parasitic capacitance occurring in the non-active region according to the present embodiments.
10 illustrates load-free driving for preventing generation of parasitic capacitance in an active region and load-free driving for preventing generation of parasitic capacitance in a non-active region during a touch mode period of a touch display device according to the present embodiments to be.
FIG. 11 is a graph showing the relationship between the load-free driving signal LFD Signal in A / A in the active region and the load-free driving signal LFD Signal in N in the non-active region during the touch mode period of the touch display device according to the present embodiments. / A).
FIG. 12 is an illustration of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
FIG. 13 is another example of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
FIG. 14 is another example of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
15 is another example of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
16 is a diagram showing main signals of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
17 is another example of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
FIG. 18 is another diagram showing main signals of a touch system capable of full load free driving (Full LFD) in the touch display device according to the present embodiments.
19 is a diagram showing two signal input states of two input terminals of the power control circuit of the touch display device according to the present embodiments.
20 and 21 are diagrams illustrating two signal input methods for the power control circuit in the touch mode section of the touch display device according to the present embodiments.
FIG. 22 is a signal transmission diagram between respective configurations in the touch system of the touch display device according to the present embodiments.
FIG. 23 is a diagram illustrating a touch system in a case where the signal control circuit is included in the first drive circuit in the touch display device according to the present embodiments.
FIG. 24 is a diagram showing a touch system in a case where a signal control circuit is included in the timing controller in the touch display device according to the present embodiments.
25 is a diagram showing a power supply control circuit of the touch display device according to the present embodiments.
26 is a diagram showing a signal control circuit of the touch display device according to the present embodiments.
27 is a diagram showing a first driving circuit of the touch display device according to the present embodiments.
28 is a diagram showing a timing controller of the touch display device according to the present embodiments.
29 is a flowchart of a method of driving a touch display device according to the present embodiments.
30 and 31 are views showing three ground wirings in the touch display device according to the present embodiments.
32 is a view showing the role of the common electrode according to the display mode and the touch mode in the touch display device according to the present embodiments.
33 is a diagram showing main signals when the display mode and the touch mode are simultaneously performed in the touch display device according to the present embodiments.
FIG. 34 is a view for explaining the principle of display in a display mode which is performed simultaneously with a touch mode in the touch display device according to the present embodiments.

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 is a system configuration diagram of a touch display device 100 according to the present embodiments.

Referring to FIG. 1, the touch display device 100 according to the present embodiments is a device capable of providing both an image display function and a touch sensing function.

In order to provide an image display function, the touch display device 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL, A data driving circuit 120 for driving a plurality of data lines DL; a gate driving circuit 130 for driving a plurality of gate lines GL; A timing controller 140 for controlling the circuit 130, and the like.

The timing controller 140 supplies various control signals to the data driving circuit 120 and the gate driving circuit 130 to control the data driving circuit 120 and the gate driving circuit 130. [

The timing controller 140 starts 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 by the data driving circuit 120, And controls the data driving at a suitable time according to the scan.

The data driving circuit 120 drives the plurality of data lines DL by supplying the data voltages to the plurality of data lines DL.

The gate driving circuit 130 sequentially supplies the scan signals to the plurality of gate lines GL to sequentially drive the plurality of gate lines GL.

The gate driving circuit 130 sequentially supplies the scan signals of the On voltage or the Off voltage to the plurality of gate lines GL under the control of the timing controller 140.

When a specific gate line is opened by the gate driving circuit 130, the data driving circuit 120 converts the image data received from the timing controller 140 into a data voltage of an analog type and supplies the data voltage to a plurality of data lines DL do.

1, the data driving circuit 120 is disposed on only one side (e.g., the upper side or the lower side) of the display panel 110, Lower side).

1, the gate driving circuit 130 is disposed on only one side (e.g., the left side or the right side) of the display panel 110, And the right side).

The timing controller 140 described above includes the vertical synchronizing signal Vsync, the horizontal synchronizing signal Hsync, the input data enable signal DE, the 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 data driving circuit 120, the timing controller 140 controls the data driving circuit 120 and the gate driving A timing signal such as a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input DE signal and a clock signal to control the circuit 130 to generate various control signals, And outputs it to the gate driving circuit 130.

For example, in order to control the gate driving circuit 130, the timing controller 140 generates a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal GOE (Gate Output Enable), and the like.

The timing controller 140 includes a source start pulse SSP, a source sampling clock SSC and a source output enable signal SOE to control the data driving circuit 120, (DCS: Data Control Signal) including a source output enable signal and the like.

Each data driving circuit 120 is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method, May be disposed directly on the display panel 110, and may be integrated on the display panel 110 as the case may be.

In addition, each data driving circuit 120 may be implemented by a chip on film (COF) method mounted on a film 121 connected to the display panel 110.

Each data driving circuit 120 may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each gate driving circuit 130 may be connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method, or may be connected to a bonding pad of a GIP (Gate In Panel) type And may be directly disposed on the display panel 110, and may be integrated and disposed on the display panel 110 as the case may be.

In addition, each gate driving circuit 130 may be implemented by a chip on film (COF) method, which is mounted on a film 131 connected to the display panel 110.

Each gate driving circuit 130 may include a shift register, a level shifter, and the like.

The touch display device 100 according to the present embodiment includes at least one source printed circuit board (S-PCB) 160 required for circuit connection to the data driving circuit 120, And a control printed circuit board (C-PCB) 170 for mounting various electric devices.

The data driving circuit 120 may be mounted on at least one source printed circuit board 160 or a film 121 on which the data driving circuit 120 is mounted may be connected.

The control printed circuit board 170 is provided with a timing controller 140 for controlling the operations of the data driving circuit 120 and the gate driving circuit 130, A power supply control circuit 150 for controlling various voltages or currents to supply or supply various voltages or currents to the circuit 130 or the like can be mounted.

The at least one source printed circuit board 160 and the control printed circuit board 170 may be circuitly connected through at least one connecting member 180.

Here, the connecting member 180 may be a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like.

The at least one source printed circuit board 160 and the control printed circuit board 170 may be integrated into one printed circuit board.

The touch display device 100 according to the present embodiments may be applied to various types of devices such as a liquid crystal display device, an organic light emitting display device, and a plasma display device .

FIG. 2 is a schematic view illustrating a touch system of the touch display device 100 according to the present embodiment. FIG. And a touch screen panel (TSP).

Referring to FIGS. 1 and 2, in order to provide a touch sensing function, the touch display device 100 according to the exemplary embodiments of the present invention includes a touch sensor (touch electrode) And a touch circuit 190 that sequentially drives a plurality of common electrodes (CE) and a plurality of common electrodes CE to sense the touch.

The touch circuit 190 sequentially drives and senses the plurality of common electrodes CE to detect touch and calculate touch coordinates.

More specifically, the touch circuit 190 sequentially selects at least one of the plurality of common electrodes CE as the common electrode CEs to be sensed, and outputs the touch driving signal TDS to the selected common electrode CEs And receives a touch sensing signal TSS from the corresponding common electrode CEs and calculates a capacitance variation amount (or a voltage variation amount or a capacitance variation amount) for each common electrode CE based on the touch sensing signal TSS received for each common electrode CE. Amount of change in charge amount, etc.), it is possible to detect the presence or absence of touch or to calculate touch coordinates.

2, the touch circuit 190 includes, for example, a micro control unit (MCU) 210 for controlling signal generation related to touch sensing and performing a process for detecting presence / absence of touch and calculating touch coordinates A touch sensing signal detecting circuit 220 for detecting the touch sensing signal TSS and transmitting the sensed touch sensing signal TSS to the micro control unit 210, and the like.

Referring to FIGS. 1 to 3, a plurality of common electrodes CE may be embedded in the display panel 110.

That is, the display panel 110 of the touch display device 100 according to the present embodiments may include a touch screen panel (TSP).

The plurality of common electrodes CE embedded in the display panel 110 not only functions as a touch electrode (touch sensor) as described above, but also applies a common voltage Vcom against the pixel voltage for image display And can also function as a display electrode.

On the other hand, a touch driving signal TDS is supplied to a plurality of common electrodes CE capable of operating as a touch electrode, and a common voltage Vcom is supplied to a plurality of common electrodes CE capable of operating as a display electrode One signal line 300 may be connected to each common electrode CE.

That is, one common electrode CE may be connected to the touch circuit 190 and the common voltage supply unit through one signal line 300. [

In the common electrode CE described herein, "common" means that the common electrode CE is shared between the touch electrode and the display electrode. That is, "common" means that the touch mode and the display mode are shared.

Not only this meaning but also "common" may mean that a "common voltage Vcom" is applied to a plurality of common electrodes CE serving as display electrodes.

As described above, the touch display device 100 according to the present embodiments can provide both an image display function and a touch sensing function. For example, the touch display device 100 may be a display such as a TV or a monitor, Or a mobile device such as a smart phone or a tablet.

The touch display device 100 according to the present embodiments can operate in a display mode for providing an image display function and a touch mode for providing a touch sensing function.

Hereinafter, the operation modes of the touch display device 100 according to the present embodiments will be described in detail.

4 is a diagram showing an operation mode of the touch display device 100 according to the present embodiments.

Referring to FIG. 4, the touch display device 100 according to the present embodiment has two operation modes including a display mode for providing an image display function and a touch mode for providing a touch sensing function.

Referring to FIG. 4, like the case A, the touch display device 100 according to the present embodiments can operate in a display mode or a touch mode at any one time.

In this case, the display mode and the touch mode can be progressed in a time-division manner, and the display mode interval and the touch mode interval are temporally separated.

Referring to FIG. 4, as in Case B and Case C, the touch display device 100 according to the present embodiments may operate in a display mode at the same time, and may also operate in a touch mode.

In this case, the display mode and the touch mode may be performed independently, and the display mode interval and the touch mode interval may overlap in time.

5 is a diagram illustrating a touch driving signal TDS supplied to a common electrode CE operating as a touch electrode during a touch mode period of the touch display device 100 according to the present embodiments.

Referring to FIG. 5, the touch display device 100 according to the present exemplary embodiment operates as a touch electrode during a display mode interval and a time division mode during a touch mode interval in which the touch display device 100 operates in a touch mode independently of the display mode. The touch driving signal TDS supplied to the common electrode CE may be a pulse width modulation (PWM) signal having an amplitude A of a constant voltage.

The signal waveform can be defined by the period T and the pulse width W of the touch driving signal TDS. In some cases, the touch-driving signal TDS may be defined as a duty cycle (W / T) and a pulse width (W), or may be defined as a duty cycle (W / T) and a period (T).

The touch circuit 190 sequentially applies the above-described touch driving signal TDS to the plurality of common electrodes CE during at least one touch mode interval and sequentially applies the touch driving signals TDS to the common electrodes CE It is possible to sense the touch by sensing the capacitance (or the voltage or the amount of charge) or the amount of change (or the amount of change in voltage or amount of charge).

If unnecessary parasitic capacitance is formed in addition to the capacitance between the common electrode CE and the pointer (e.g., a finger, a pen, etc.) during touch driving and touch sensing, the desired capacitance and the capacitance or the variation amount thereof combined with the parasitic capacitance are grasped, The accuracy of the touch sensing may be lowered.

Accordingly, the present embodiments can provide a method for preventing (eliminating) parasitic capacitance that may degrade the touch sensing accuracy, and will be described in more detail below.

6 is a diagram illustrating parasitic capacitances Cp1 Cp2 and Cp3 generated in the active area A / A during the touch mode period of the touch display device 100 according to the present embodiments.

6, when the touch driving signal TDS is applied to the common electrode CEs serving as the touch electrode as the touch sensing object during the touch mode period, the touch driving signal TDS is applied to the common electrode CEs A parasitic capacitance Cp1 may be formed between the electrode CEs and the data line DL disposed in the display panel 110. [

A parasitic capacitance Cp2 may be formed between the common electrode CEs to which the touch driving signal TDS is applied and the gate line GL disposed in the display panel 110. [

The parasitic capacitance Cp3 may also be formed between the common electrode CEs to which the touch driving signal TDS is applied and the common electrode CEo other than the sensing object at the present time.

In other words, in addition to the capacitance between the pointer and the common electrode CEs which must be formed for touch sensing during the touch driving by applying the touch driving signal TDS to the common electrode CEs to be sensed, Unnecessary parasitic capacitances Cp1, Cp2, and Cp3 are generated between the common electrodes CEs to be sensed and other patterns (e.g., data line DL, gate line GL, other common electrode CE, etc.) .

These parasitic capacitances (Cp1, Cp2, Cp3) are a main factor for lowering the sensing accuracy in a capacitance-based touch sensing method.

That is, the parasitic capacitances Cp1, Cp2, and Cp3 generated in the vicinity of the common electrode CEs to be sensed act as a "load" during touch driving and touch sensing, Components) can be induced to lower the sensing accuracy.

More specifically, the touch sensing signal detection circuit 220 detects the touch sensing signal TSS, which is a noise (error) caused by the parasitic capacitances Cp1, Cp2 and Cp3 acting as a load, from the common electrode CEs Therefore, the micro control unit 210 can detect the presence or absence of an erroneous touch by using the touch sensing signal TSS in which a noise (error) occurs, or calculate erroneous touch coordinates.

Accordingly, the present embodiments can provide a "load free driving (LFD) ", which is a driving method capable of preventing unnecessary parasitic capacitances Cp1, Cp2 and Cp3 from occurring and improving the touch sensing accuracy .

This load-free driving (LFD) can be defined as driving for eliminating a load that lowers the touch sensing accuracy. The load-free driving (LFD) is a main touch driving Is an additional drive that is accompanied by.

Hereinafter, the load-free driving (LFD) method of the touch display device 100 according to the present embodiments will be described in more detail.

7 is a block diagram illustrating a structure of a touch panel of a touch display device 100 according to an exemplary embodiment of the present invention in which the parasitic capacitances Cp1, Cp2, and Cp3 are prevented from being generated in the active area A / A of the display panel 110 during a touch mode period. (LFD). Fig.

7, the data line DL, the gate line GL, and the other common electrode CEo are respectively connected to the common electrode CEs as a touch sensing object during a touch driving period in which the touch driving signal TDS is applied to the common electrode CEs The data line DL and the gate line GL (not shown) are connected to each other through a load-free drive LFD for applying a signal having the same phase as the phase of the touch drive signal TDS And the parasitic capacitances Cp1, Cp2, and Cp3 for the other common electrode CEo, respectively.

The load-free drive signal for preventing the parasitic capacitance Cp1 from occurring to the data line DL is referred to as a data load pre-drive signal DATA_LFD.

A load-free driving signal for preventing the generation of the parasitic capacitance Cp2 with respect to the gate line GL is referred to as a gate load free driving signal GATE_LFD.

A load-free driving signal for preventing generation of the parasitic capacitance Cp3 for the other common electrode CEo is referred to as a common electrode rod pre-driving signal Vcom_LFD.

The data load pre-driving signal DATA_LFD, the gate load pre-driving signal GATE_LFD and the common electrode rod pre-driving signal Vcom_LFD have the same phase as the touch driving signal TDS.

The data load pre-driving signal DATA_LFD, the gate load pre-driving signal GATE_LFD, and the common electrode rod pre-driving signal Vcom_LFD may have the same amplitude as the touch driving signal TDS.

Here, the same amplitude means that the difference between the low level voltage and the high level voltage of each signal is the same.

The signals having the same amplitude may be the same or different from each other as long as the difference between the low level voltage and the high level voltage is the same, and the high level voltage may be the same or different from each other.

Since the amplitude and phase between the data load pre-driving signal DATA_LFD applied to the data line DL and the touch driving signal TDS applied to the common electrode CEs to be sensed are the same through the above-described load-free driving, The potential difference between the data line DL and the common electrode CEs to be sensed does not occur and the parasitic capacitance Cp1 can be prevented.

Since the amplitude and the phase of the gate drive pre-drive signal GATE_LFD applied to the gate line GL and the touch drive signal TDS applied to the common electrode CEs to be sensed are the same, The potential difference between the common electrodes CEs to be sensed does not occur and the parasitic capacitance Cp2 can be prevented.

Since the amplitude and the phase of the common electrode rod pre-driving signal Vcom_LFD applied to the common electrode CEo which is not a sensing target and the touch driving signal TDS applied to the common electrode CEs to be sensed are the same, The potential difference between the common electrode CEo which is not the object and the common electrode CEs which is the sensing object does not occur and the parasitic capacitance Cp3 can be prevented.

The parasitic capacitances Cp1, Cp2 and Cp3 described in FIG. 6 are related to the patterns DL, GL and CEo arranged in the active area A / A corresponding to the image display area of the display panel 110 It is.

On the other hand, the touch driving signal TDS and the touch sensing signal TSS pass not only to the active area A / A but also to the non-active area N / A.

The term "non-active area N / A " as used herein means an area other than the active area A / A, (E.g., printed circuit board, film, etc.).

As described above, since the touch driving signal TDS and the touch sensing signal TSS pass through not only the active area A / A but also the non-active area N / A, the non-active area N / A), there is a possibility that parasitic capacitance will occur.

The position at which the parasitic capacitance can occur in the non-active region N / A is determined by the position of the signal transmission path of the touch drive signal TDS and the touch sensing signal TSS and the position of the non-active region N / And the position of the signal transmission path of the other voltage signals in the signal path.

That is, the position where the parasitic capacitance can occur in this non-active region N / A is determined by the touch driving signal TDS and the touch sensing signal TSS and the other voltages in the non-active region N / And may vary depending on the location of the structures responsible for signal transmission, reception, and processing of signals.

The positions of the structures responsible for signal transmission / reception and processing for the touch driving signal TDS, the touch sensing signal TSS and the other voltage signals in the non-active area N / A are shown in Figs. 8 and 9 , And load-free driving that prevents the generation of parasitic capacitance in the non-active region N / A according to the illustrated position will now be discussed.

8 is a view showing an embodiment of the touch circuit 190 and the driving circuits 810 and 820 of the touch display device 100 according to the present embodiments.

The micro control unit 210 and the touch sensing signal detection circuit 220 included in the touch circuit 190 may be implemented as one integrated circuit or as separate integrated circuits.

Alternatively, the touch sensing signal detection circuit 220 may be included in the data driving circuit 120.

In addition, the touch sensing signal detection circuit 220 may be included in the first driving circuit 810 implemented as an integrated circuit together with the data driving circuit 120, as shown in FIG.

Accordingly, the first driving circuit 810 can perform both the data driving function and a part of the touch function.

The micro control unit 210 included in the touch circuit 190 may be implemented separately as shown in FIG. 8 or may be implemented as the first driving circuit 810, the data driving circuit 120, or the timing controller 140, And the like.

The gate driving circuit 130 is also referred to as a second driving circuit 820 in order to distinguish it from the first driving circuit 810.

8, the first driving circuit 810 is implemented in the form of one integrated circuit chip including at least one data driving circuit 120 and at least one touch sensing signal detecting circuit 220, In the case where the micro control unit 210 is separately configured, the touch display device 100 according to the present embodiments can be implemented as the system configuration of FIG.

The generation positions of the parasitic capacitances in the non-active region N / A according to the system configuration of FIG. 9 will be described below.

9 is a diagram for explaining the system configuration of the touch display device 100 according to the present embodiments and the parasitic capacitance occurring in the non-active region N / A.

9, when the common electrode CEs at one corner of the display panel 110 is currently subjected to touch driving and sensing, the touch driving signal TDS or a corresponding signal is applied to the control printed circuit board 170, Through the signal line 300 electrically connected to the first driving circuit 810 via the connecting member 180, the source printed circuit board 160, the film 121 and the first driving circuit 810, And is transmitted to the electrodes CEs.

Here, the signal line 300 is formed on the substrate of the display panel 110.

The signal corresponding to the above-mentioned touch driving signal TDS may be generated by generating a common electrode voltage pulse Vcom_PWM and a common electrode voltage pulse Vcom_PWM which are references in generating the touch driving signal TDS, The reference potential may include a ground voltage pulse GND_PWM and the like.

The touch sensing signal TSS is transmitted to the micro control unit 210 along the same path 900 after the touch driving signal TDS is transmitted to the common electrode CEs along the transmission path 900 Touch sensing is performed.

The touch driving and sensing path 900 may include a control printed circuit board 170, a connecting member 180, and a source printed circuit board (not shown) as well as an active area A / A in which most of the sensing lines 300 are disposed. The non-active region N / A including the substrate 120, the film 121, and the panel outer region (bezel region).

Thus, as described above, the parasitic capacitance acting on the rod that degrades the sensing accuracy can occur in the active area A / A as well as in the non-active area N / A.

Regarding the touch drive and sensing path 900 present in the non-active area N / A, the location of the parasitic capacitance at the non-active area N / A is determined by, for example, (LOP) line (hereinafter, referred to as a "LOP line"), films 121 and 131, and the like disposed on the connection member 180 and the source printed circuit board 160, On-film (hereinafter, referred to as "LOG line"), and a line (LOG: hereinafter referred to as "LOG line"

10 is a timing chart showing the relationship between the load-free driving and the non-active region N / A for preventing the parasitic capacitance from occurring in the active region A / A during the touch mode period of the touch display device 100 according to the present embodiments. FIG. 11 is a diagram showing a load-free driving signal in the active area A / A during the touch mode period of the touch display device 100 according to the present embodiments. (LFD Signal in A / A) in the non-active region N / A and the load-free driving signal LFD Signal in N / A in the non-active region N / A.

10 and 11, the parasitic capacitance in the active area A / A is applied to the common electrode CEs to be sensed while the touch driving signal TDS is applied, as described above with reference to FIG. 7, An active area A / A, which supplies the load-free driving signals DATA_LFD, GATE_LFD and Vcom_LFD on the same level as the touch driving signal TDS to the patterns DL, GL and CEo arranged in the active area A / Quot; LFD in A / A "

Here, the common electrode load pre-driving signal Vcom_LFD and the touch driving signal TDS are the same as the common electrode voltage pulse Vcom_PWM subjected to the pulse width modulation based on the common voltage Vcom_DC of the DC voltage, Is a signal generated from the pulse Vcom_PWM.

The data pre-driving signal DATA_LFD and the gate pre-driving signal GATE_LFD may be the same as the common electrode voltage pulse Vcom_PWM or a signal made from the common electrode voltage pulse Vcom_PWM.

10 and 11, the parasitic capacitance in the non-active region N / A is also the sum of the touch driving signal TDS and the touch driving signal TDS while the touch driving signal TDS is applied to the common electrode CEs, Active region N / A, which supplies the load-free driving signals LOG_LFD, LOP_LFD and LOF_LFD on the same level to the lines (LOG line, LOP line and LOF line) arranged in the non-active region N / A (LFD in N / A) at "

10 and 11, while the touch driving signal TDS is applied to the common electrode CEs to be sensed, the lines (LOG line, LOP line, LOF) arranged in the non-active region N / The gate high level voltage VGH, the gate low level voltage VGL, and the like, for example, as the signal to be applied to the first power supply voltage VCC, the first power supply voltage VCC, the second power supply voltage VDD,

Here, the first power source voltage VCC, the second power source voltage VDD, the gate high level voltage VGH, the gate low level voltage VGL and the like are supplied to the first driving circuit 810 and the Quot; display voltage "used by the two-driver circuit 820 for data driving and gate driving.

Although the display voltage is a voltage used in providing an image display function during a display mode period, it is not directly related to touch driving and touch sensing during a touch mode period, but the driving circuits 810, 820 and / (110) in the form of a DC voltage.

11, while the touch drive signal TDS is applied to the common electrode CEs to be sensed, by the load-free driving in the non-active region N / A, the non-active region N The load-free driving signals LOG_LFD, LOP_LFD, and LOF_LFD applied to the lines (LOG line, LOP line, and LOF line) arranged in the first power supply voltage / Free driving signals VCC_PWM, VDD_PWM, and VDD_PWM generated in phase with the touch driving signal TDS corresponding to the pulse width modulation signal, based on the display voltages such as the gate high level voltage VGH and the gate low level voltage VGL, VGH_PWM, VGL_PWM).

If the load-free driving in the non-active region N / A is not provided, the first power source voltage VCC, the second power source voltage VDD, the gate high-level voltage VGH, The display voltage such as the level voltage VGL is applied to the lines (LOG line, LOP line, LOF line) arranged in the non-active area N / A in the form of a DC voltage.

As described above, when the display voltage in the form of a DC voltage is applied to the lines (LOG line, LOP line, LOF line) arranged in the non-active region N / A during the touch mode period, / A), the parasitic capacitance can not but occur.

The touch display device 100 according to the present exemplary embodiment does not apply the display voltages VCC, VDD, VGH, VGL ... of the DC voltage type but the load-free driving Active region (N / A) by applying the display voltage pulses (VCC_PWM, VDD_PWM, VGH_PWM, VGL_PWM) as a signal to the lines (LOG line, LOP line and LOF line) arranged in the non- N / A) of the parasitic capacitance can be prevented.

Referring to FIG. 11, the load-free driving signal in the active area A / A and the load-free driving signal in the non-active area N / A will be summarized as follows.

The common electrode load pre-driving signal Vcom_LFD, the data pre-driving signal DATA_LFD, and the gate pre-driving signal GATE_LFD, etc., as the load-free driving signal LFD Signal in A / A in the active area A / have.

The load-free driving signal in the active area A / A may have the same phase as the touch driving signal TDS, and may have the same pulse width and the same amplitude as the touch driving signal TDS.

The first power source voltage pulse VCC_PWM, the second power source voltage pulse VDD_PWM, the gate high level voltage pulse VGH_PWM (VGH_PWM), and the gate high level voltage pulse VGH_PWM And a gate low level voltage pulse VGL_PWM.

Of these display voltage pulses, the first power supply voltage pulse VCC_PWM and the second power supply voltage pulse VDD_PWM are applied to the line (LOP, LOF, etc.) of the non-active region N / A, Lt; RTI ID = 0.0 > 1 < / RTI >

The gate high level voltage pulse VGH_PWM and the gate low level voltage pulse VGL_PWM are applied to the lines LOP, LOF and LOG of the non-active region N / A among the display voltage pulses, 820. < / RTI >

The display voltage pulses such as the first power source voltage pulse VCC_PWM, the second power source voltage pulse VDD_PWM, the gate high level voltage pulse VGH_PWM and the gate low level voltage pulse VGL_PWM are the same as the touch driving signal TDS And may have the same amplitude as the pulse width of the touch driving signal TDS.

The first driving circuit 810 supplies the common electrode voltage Vcom_DC of the DC voltage form to all the common electrodes CE or the common electrode voltage pulse Vcom_PWM of the pulse width modulation signal form during the display mode period, May be supplied to all the common electrodes CE.

4, when the display mode and the touch mode are progressed in a time-sharing manner, the first driving circuit 810 supplies the common electrode voltage Vcom_DC of the DC voltage form to all And supplies it to the common electrode CE.

4, when the display mode and the touch mode proceed in parallel so that the display mode period overlaps with the touch mode period in a time-wise manner, the first driving circuit 810 outputs the pulse width The common electrode voltage pulse Vcom_PWM in the form of a modulation signal can be supplied to all the common electrodes CE.

In this case, any one of the common electrodes CEs of the plurality of common electrodes CE operates at the same time as the display electrode for the display mode and the touch electrode for the touch mode at the same time, and the remaining common electrode CEo And serves as a display electrode for the display mode.

Therefore, at any one time, any one of the common electrodes CEs is an electrode to be subjected to touch driving and touch sensing, and the remaining common electrode CEo is an electrode to be subjected to load-free driving.

Accordingly, the common electrode voltage pulse Vcom_PWM is applied to all the common electrodes CE.

On the other hand, during the display mode period that is performed simultaneously with the touch mode period, the data voltage for image display can also be applied to the data line as a data voltage pulse in the form of a pulse width modulation signal.

Here, the data voltage pulse in the form of a pulse width modulation signal for image display can serve as a data load pre-driving signal in the touch mode section.

According to the above description, the display mode and the touch mode can be performed in a time-divided manner, independently and in parallel.

Particularly, even if the common electrode voltage pulse Vcom_PWM in the form of a pulse width modulation signal is applied to all the common electrodes CE during the display mode period, the data voltage for image display is also applied to the data line So that the display mode and the touch mode can be operated simultaneously, as shown in Case B or Case C, respectively.

Therefore, due to the shared electrode structure in which the common electrode CE provides both the roles of the touch electrode and the display electrode, it is possible to overcome the limitation that the touch mode and the display mode can not be performed at the same time, It is possible to prevent deterioration of performance of image display and touch sensing in accordance with the time division progression of the display mode and efficiently provide an image display function and a touch sensing function.

In the following, the touch display device 100 according to the present embodiment is driven in a full load-free mode including the load-free driving in the active area A / A and the load-free driving in the non-active area N / (Full LFD) and a touch system for this purpose will be described in more detail.

FIG. 12 is an exemplary view of a touch system capable of full load free driving (Full LFD) in the touch display device 100 according to the present embodiments. FIG. 13 is a diagram illustrating a touch display device 100 according to the present embodiments , And full-load-free driving (Full LFD).

12 to 13, the touch system of the touch display device 100 according to the present exemplary embodiments includes a plurality of common electrodes CE disposed on the display panel 110 and used for both touch driving and display driving, A power supply control circuit 150 that generates a signal related to touch driving and load free driving, a first driving circuit 810 that receives a signal generated by the power supply control circuit 150 and performs touch driving and load free driving And a second driving circuit 820 that receives the signal generated by the power control circuit 150 and performs load free driving.

12 to 13, the touch system of the touch display device 100 according to the present embodiment includes a signal control circuit 1200 for generating a ground voltage pulse GND_PWM and outputting it to the power control circuit 150, As shown in FIG.

12 to 13, during the touch mode period, the power supply control circuit 150 receives the "ground voltage pulse GND_PWM" corresponding to the pulse width modulation signal at the ground voltage input terminal N1.

The power supply control circuit 150 generates a common electrode voltage pulse Vcom_PWM that is pulse width modulated based on the common electrode voltage Vcom_DC in the form of a DC voltage in accordance with the input ground voltage pulse GND_PWM.

The power supply control circuit 150 also applies the pulse width modulated display voltage pulses based on the display voltages (for example, VCC_DC, VDD_DC, VGH_DC, and VGL_DC) of the DC voltage type in accordance with the input ground voltage pulse GND_PWM (E.g., VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM).

The power control circuit 150 outputs the common electrode voltage pulse Vcom_PWM and the corresponding display voltage pulses (e.g., VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM) generated by using the input ground voltage pulse GND_PWM.

12 to 13, the first driving circuit 810 applies a first display voltage pulse (for example, VCC_PWM, VDD_PWM, VCC_PWM, VG_PWM, VGL_PWM) of the display voltage pulses ) And a common electrode voltage pulse Vcom_PWM through a line (for example, an LOP line, an LOF line, etc.) arranged in the non-active area and receives a touch drive signal TDS Can be sequentially supplied to the plurality of common electrodes CE.

Here, the fact that the touch drive signal TDS is the same as the common electrode voltage pulse Vcom_PWM may mean that the signal characteristics such as the amplitude and the phase are the same.

The fact that the touch driving signal TDS corresponds to the common electrode voltage pulse Vcom_PWM means that at least one of the amplitude, pulse width, period, phase, etc. of the touch driving signal TDS for the touch driving and the touch sensing efficiency It may mean that the signal characteristic may be different from the common electrode voltage pulse Vcom_PWM.

12 to 13, the second driving circuit 820 generates a second display voltage pulse (e.g., VGH_PWM, VGL_PWM) of the display voltage pulses (e.g., VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM) (For example, LOP line, LOF line, LOG line, etc.) arranged in the non-active area.

As described above, during the touch mode period, the ground voltage, which is a reference for all the power supplies used in the touch display device 100, is swung to the ground voltage pulse GND_PWM in the form of a pulse width modulation signal, 150, the power supply control circuit 150 can swing the DC voltage in the touch mode section in the form of a pulse width modulation signal and output it.

Accordingly, the touch display device 100 according to the present embodiments can provide full-load free driving easily and efficiently.

More specifically, the power supply control circuit 150 swings the common electrode voltage Vcom_DC in the DC voltage form according to the ground voltage pulse GND_PWM to generate a common electrode voltage pulse Vcom_PWM in the form of a pulse width modulation signal, can do.

Here, the common electrode voltage pulse Vcom_PWM is a pulse necessary for the first driving circuit 810 to perform the touch driving and the load-free driving in the active area A / A.

That is, the common electrode voltage pulse Vcom_PWM is equal to or corresponds to the touch driving signal TDS and the load-free driving signals Vcom_LFD and DATA_LFD in the active area A / A.

The power control circuit 150 swings the display voltages VCC_DC, VDD_DC, VGH_DC and VGL_DC of the DC voltage type according to the ground voltage pulse GND_PWM to generate display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM, VGL_PWM) can be generated and output.

Accordingly, the display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM, which are the same or correspond to the touch driving signal TDS, are applied to the lines (LOP line, LOF line, and LOG line) in the non-active area N / A . Thus, load-free driving is performed in the non-active area N / A.

The common electrode voltage pulse Vcom_PWM, the display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM and VGL_PWM and the touch driving signal TDS may be a pulse width modulated signal having the same phase as the ground voltage pulse GND_PWM.

As described above, by making the phases of all the signals in the active area A / A and the non-active area N / A equal to the phases of the ground voltage pulse GND_PWM during the touch mode period, (Full LFD) can be efficiently provided.

On the other hand, the common electrode voltage pulse Vcom_PWM, the display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM, and the touch driving signal TDS have the same pulse widths and amplitudes as the ground voltage pulse GND_PWM Width modulated signal. In this case, the common electrode voltage pulse Vcom_PWM, the display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM and the touch driving signal TDS may be in phase with or different from the ground voltage pulse GND_PWM.

In this regard, in order to reduce the parasitic capacitance, the signals (GND_PWM, TDS, Vcom_PWM, VCC_PWM, VDD_PWM, VGH_PWM, VGL_PWM, VGH_PWM, VGL_PWM) generated during the touch mode section should ideally be in the same phase, The phase of each signal may be varied depending on the phase difference between the input signal and the output signal. In consideration of this, a slight phase difference may be intentionally generated to further reduce the parasitic capacitance.

That is, during the touch mode period, the amplitude and pulse width of all signals in the active area A / A and the non-active area N / A are equal to or correspond to the amplitude and pulse width of the ground voltage pulse GND_PWM However, the phase deviation is intentionally made taking into account the delay deviation of each signal, so that the full load free drive can be more accurately provided.

The first driving circuit 810 sequentially drives the plurality of common electrodes CE in the touch mode to sequentially perform the touch sensing operation so that the common electrode voltage pulse Vcom_PWM is applied to the common electrode CEs, The common electrode load pre-driving signal Vcom_LFD, which is the same as or corresponds to the common electrode voltage pulse Vcom_PWM, is supplied to the common electrode CEo other than the touch sensing object when supplying the same or corresponding touch drive signal TDS .

The first driving circuit 810 sequentially drives the plurality of common electrodes CE in the touch mode to perform touch sensing so that the common electrode voltage pulse Vcom_PWM is applied to the common electrode CEs, The data line load pre-driving signal DATA_LFD which is the same as or corresponds to the common electrode voltage pulse Vcom_LFD can be supplied to at least one data line DL when supplying the same or corresponding touch driving signal TDS.

When the first driving circuit 810 supplies the touch drive signal TDS equal to or corresponding to the common electrode voltage pulse Vcom_PWM to the common electrode CEs to be subjected to touch sensing, Can supply the gate line load pre-driving signal (GATE_LFD) equal to or corresponding to the common electrode voltage pulse (Vcom_LFD) to at least one gate line (GL).

The common electrode load pre-driving signal Vcom_LFD, the data line load pre-driving signal DATA_LFD, and the gate line pre-driving signal Vcom_LFD, which are pulse-width modulated in accordance with the ground voltage pulse GND_PWM as a reference of the touch driving signal TDS, By applying the load-free driving signal GATE_LFD to the common electrode CEo, the data line DL and the gate line GL disposed in the active area A / A, the load in the active area A / Free drive is provided, and parasitic capacitance generation in the active area A / A can be prevented.

On the other hand, the first display voltage pulse (for example, VCC_PWM, VDD_PWM) described above is supplied to the power control circuit 150 through a signal line (e.g., LOP line, LOF line, etc.) in the non- And may be transmitted to the first driving circuit 810.

The second display voltage pulse (e.g., VGH_PWM, VGL_PWM) is also applied to the power control circuit 150 through a signal line (e.g., LOP line, LOF line, LOG line, etc.) in the non- To the second driving circuit 820.

As described above, during the touch mode period, the display voltage (e.g., VCC_DC, VDD_DC, VGH_DC, VGL_DC) in the form of DC voltage is applied to the signal line (e.g., LOP line, LOF line, (E.g., VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM) that are pulse-width-modulated according to the ground voltage pulse GND_PWM, which is a reference for generating the touch driving signal TDS, The non-active region N / A is transmitted through the signal line (e.g., the LOP line, the LOF line, the LOG line, and the like) in the non-active region N / A, Free driving in the non-active region N / A, thereby preventing generation of parasitic capacitance in the non-active region N / A.

13, the power supply control circuit 150 receives the pulse width modulation signal as the ground voltage pulse GND_PWM at the ground voltage input terminal N1, and receives the pulse width modulation signal May be input to the first power voltage input terminal N2 as the first power voltage pulse VCC_PWM.

On the other hand, the signal control circuit 1200 shown in Figs. 12 and 13 may be included in the first driving circuit 810 or may be included in the timing controller 140, 160 and a separate printed circuit board other than the control printed circuit board 170.

12 and 13 illustrate only the signal system of the touch system in the touch mode section when the mode and the touch mode are progressed in a time-sharing manner, and the display mode and the touch mode independently and in parallel The signal system of the touch system in the touch mode section that can overlap with the display mode section may be displayed.

Figs. 14 and 15 are still other illustrations of a touch system capable of full load free driving (Full LFD) in the touch display device 100 according to the present embodiments.

FIGS. 14 and 15 are diagrams illustrating a signal system of a touch system that can be applied to both a display mode and a touch mode independently and in parallel, and a display mode and a touch mode that are time-shared.

Referring to FIGS. 14 and 15, the signal control circuit 1200 may generate a ground voltage pulse GND_PWM through pulse modulation.

Here, the pulse modulation may be, for example, pulse width modulation.

For example, the signal control circuit 1200 may generate a ground voltage pulse GND_PWM having a predetermined pulse width, period, or duty cycle, and output it to the power supply control circuit 150.

The signal control circuit 1200 generates the touch driving signal TDS and the various load free driving signals Vcom_LFD, DATA_LFD, GATE_LFD, VCC_PWM, VDD_PWM, and VDD_PWM in the form of a pulse width modulation signal used in the touch display device 100, VGH_PWM, VGL_PWM, and the like) can be efficiently generated based on the ground voltage pulse GND_PWM.

On the other hand, the signal control circuit 1200 may generate the level (amplitude voltage level) of the ground voltage pulse GND_PWM and output it to the power supply control circuit 150.

For example, the signal control circuit 1200 may convert the amplitude of the ground voltage pulse GND_PWM initially generated by 1, 2, 3, or the like by an integer multiple, And in some cases, it may be converted to be as small as 0.7 times, and output.

According to the above description, the ground voltage pulse GND_PWM can be variously generated in consideration of the performance, efficiency, etc. of the touch driving and the load free driving.

14 and 15, the signal control circuit 1200 includes, for example, a micro control unit 210 that performs a main signal control function, a first multiplexer 1410 that performs a signal selection function, and the like .

The micro control unit 210 can output the ground voltage GND_DC and the ground voltage pulse GND_PWM in the form of DC voltage.

Also, the first multiplexer 1410 receives the ground voltage GND_DC and the ground voltage pulse GND_PWM, and outputs the touch mode interval (a period in which the display mode interval is temporally separated from the display mode interval or a period The ground voltage pulse GND_PWM may be selected and output to the ground voltage input terminal N1 of the power supply control circuit 150. [

For example, the first multiplexer 1410 may select the ground voltage GND_DC during the display mode period (which may be time-divided and temporally separated from the touch mode period) to generate a ground voltage input terminal of the power control circuit 150 N1).

The ground signal GND input to the ground voltage input terminal N1 of the power supply control circuit 150 may be a ground voltage GND_DC in the form of a DC voltage or a ground voltage pulse in the form of a pulse width modulated signal GND_PWM).

As described above, the signal control circuit 1200 uses the pulse width modulation signal generating function of the micro control unit 210 and the signal selecting function of the first multiplexer 1410 so that the ground voltage GND_DC in the DC voltage form The ground voltage pulse GND_PWM in the form of a swinged pulse width modulation signal can be easily and efficiently generated and input to the ground voltage input terminal N1 of the power control circuit 150. [

Further, the touch related signals can be easily controlled through control of changing, adjusting, etc., the ground voltage pulse GND_PWM through the pulse width modulation control of the micro control unit 210.

Referring to FIG. 15, the signal control circuit 1200 may further include a voltage regulator 1500 and a second multiplexer 1520. The voltage regulator 1500 regulates the low level voltage of the ground voltage pulse GND_PWM and outputs the ground voltage pulse GND_PWM having the adjusted low level voltage VCC_DC as the first power voltage pulse VCC_PWM do. Accordingly, the second multiplexer 1520 receives the first power supply voltage VCC_DC and the first power supply voltage pulse VCC_PWM of the DC voltage type, and outputs the touch mode interval (the display mode interval or the display mode The first power supply voltage pulse VCC_PWM is selected and output to the first power supply voltage input N2 of the power supply control circuit 150 during a period in which the first power supply voltage pulse VCC_PWM overlaps with the first power supply voltage VCC_PWM. The amplitude adjuster 1500 described above may be implemented as a level shifter, for example.

The second multiplexer 1520 selects the first power voltage VCC_DC of the DC voltage type during the display mode period (which may be time-divided and temporally separated from the touch mode period) To the first power supply voltage input (N2).

The first power supply voltage VCC1 input to the first power supply voltage input N2 of the power supply control circuit 150 may be a first power supply voltage VCC_DC in the form of a DC voltage or a first power supply voltage VCC_PWM, Lt; / RTI >

As described above, the signal control circuit 1200 uses the pulse width modulation signal generating function of the micro control unit 210 and the signal selecting function of the second multiplexer 1520 to generate the first power voltage VCC_DC Can easily and efficiently generate the first power supply voltage pulse VCC_PWM in the form of a swinged pulse width modulation signal and input the first power supply voltage pulse VCC_PWM to the first power voltage input terminal N2 of the power control circuit 150. [

15, the signal (the first power supply voltage pulse VCC_PWM or the first power supply voltage VCC_DC) output from the second multiplexer 1520 is supplied as the input signal VCC2 of the timing controller 140 And may be input to the timing controller 140.

FIG. 16 is a diagram showing main signals of a touch system capable of full load free driving (Full LFD) in the touch display device 100 according to the present embodiments.

16 is a diagram showing a main signal in the touch system of FIG. 15 on the assumption that the display mode and the touch mode progress in a time division manner.

16, the display mode and the touch mode are progressed in time division according to the touch synchronous signal (TOUCH SYNC) generated in the timing controller 140 or the micro control unit 210 or another controller (not shown).

First, the signal output state during the display mode section will be described.

During the display mode period, the micro control unit 210 outputs only the ground voltage (GND_DC) in the form of a DC voltage without outputting the pulse width modulation signal according to the pulse width modulation control.

The first multiplexer 1410 outputs the ground voltage GND_DC of the input DC voltage form as the ground signal GND in accordance with the first multiplexer control signal (which may be the TOUCH SYNC) 150 to the ground voltage input terminal N1.

At this time, the second multiplexer 1520 supplies the first power supply voltage VCC_DC of the input DC voltage form to the first power supply signal VCC1 (VCC_DC) according to the second multiplexer control signal (which may be the touch synchronization signal TOUCH SYNC) To the first power supply voltage input N2 of the power supply control circuit 150. [

The power supply control circuit 150 uses the ground voltage GND_DC of the DC voltage type input to the ground voltage input terminal N1 and the first power voltage VCC_DC of the DC voltage type input to the first power voltage input terminal N2 And outputs the common electrode voltage Vcom_DC in the form of a DC voltage as the common electrode signal Vcom to output the first power supply voltage VCC_DC in the form of a DC voltage as the first power supply signal VCC, And outputs the second power supply voltage VDD_DC as the second power supply signal VDD and outputs the gate high level voltage VGH_DC in the DC voltage form as the gate high level signal VGH and the gate low level voltage (VGL_DC) as the gate low level signal (VGL).

Next, the signal output state during the touch mode section will be described.

During the touch mode period, the microcontroller 210 outputs a ground voltage pulse GND_PWM having an amplitude of? V according to the pulse width modulation control, and also outputs a ground voltage (GND_DC) in the form of a DC voltage.

The first multiplexer 1410 selects one of the ground voltage pulses GND_PWM and ground voltage GND_DC in the form of DC voltage in accordance with the first multiplexer control signal (which may be a TOUCH SYNC) (GND_PWM) as the ground signal (GND) and outputs it to the ground voltage input terminal (N1) of the power supply control circuit (150).

The second multiplexer 1520 receives the input first power supply voltage pulse VCC_PWM and the first power supply voltage VCC_DC in the form of a DC voltage according to a second multiplexer control signal (which may be a touch synchronization signal TOUCH SYNC) The first power supply voltage pulse VCC_PWM is selected as the first power supply signal VCC1 and is output to the first power supply voltage input N2 of the power supply control circuit 150. [

The power supply control circuit 150 uses the ground voltage pulse GND_PWM input to the ground voltage input N1 and the first power supply voltage pulse VCC_PWM input to the first power voltage input N2, And outputs the first power source voltage pulse VCC_PWM as the common electrode signal Vcom and outputs the first power source voltage pulse VCC_PWM as the first power source signal VCC and the second power source voltage pulse VDD_PWM as the second power source signal VDD, And outputs the gate high level voltage pulse VGH_PWM as the gate high level signal VGH and the gate low level voltage pulse VGL_PWM as the gate low level signal VGL.

When the power control circuit 150 outputs the common electrode voltage pulse Vcom_PWM as the common electrode signal Vcom to the first driving circuit 810, the first driving circuit 810 uses the common electrode voltage pulse Vcom_PWM The touch driving signal TDS is supplied to the common electrode CEs to be sensed and the common electrode rod pre-driving signal Vcom_LFD is supplied to the other common electrode CEo.

Here, the common electrode voltage pulse Vcom_PWM has an amplitude? V equal to the amplitude of the ground voltage pulse GND_PWM.

The common electrode load pre-driving signal Vcom_LFD is a load-free driving signal in the active area A / A.

In addition, the first power source voltage pulse VCC_PWM, the second power source voltage pulse VDD_PWM, the gate high level voltage pulse VGH_PWM and the gate low level voltage pulse VGL_PWM are display voltage pulses, Active region N / A as a signal applied to the line (LOP line, LOF line, LOG line) in the active region N / A.

This display voltage pulse has an amplitude DELTA V that is equal to the amplitude of the ground voltage pulse GND_PWM.

17 is another example of a touch system capable of full load free driving (Full LFD) in the touch display device 100 according to the present embodiments, FIG. 18 is a diagram showing another example of a main signal Fig.

In order to control the performance, efficiency, etc. of touch driving and sensing and load free driving, it is necessary to be able to control the ground voltage pulse (GND_PWM) which is a reference of all signals related to touch driving, sensing and load free driving.

The signal control circuit 1200 may further include a level shifter 1700 for converting the level (amplitude) of the ground voltage pulse GND_PWM output from the micro control unit 210 have.

The level shifter 1700 is electrically connected between the microcontroller 210 and the two multiplexers 1410 and 1520 to control the level (amplitude) of the ground voltage pulse GND_PWM output from the microcontroller 210, And inputs the level-converted ground voltage pulse GND_PWM to the two multiplexers 1410 and 1520.

The first multiplexer 1410 selects the ground voltage pulse GND_PWM whose level has been converted by the level shifter 1700 during the touch mode period and outputs the ground voltage pulse GND_PWM to the power supply control circuit 150.

The second multiplexer 1520 selects and outputs the first power supply voltage pulse VCC_PWM to the power supply control circuit 150 during the touch mode period.

18, when the amplitude of the ground voltage pulse GND_PWM output from the micro control unit 210 is DELTA V and the level shifter 1700 multiplies the amplitude (level) of the ground voltage pulse GND_PWM N times The amplitude of the ground voltage pulse GND_PWM output from the level shifter 1700 is N *? V.

The display voltage pulse is also applied to the level shifter 1700 by the first power source voltage pulse VCC_PWM, the second power source voltage pulse VDD_PWM, the gate high level voltage pulse VGH_PWM and the gate low level voltage pulse VGL_PWM. (N * [Delta] V) which is the same as the ground voltage pulse GND_PWM output from the inverter circuit.

The level shifter 1700 described above is used to adjust (convert) the level of the ground voltage pulse GND_PWM, which is a reference of all signals related to touch driving, sensing, and load free driving, And the like can be efficiently controlled. Through this, it is possible to effectively control the performance and efficiency of touch driving, sensing, and load-free driving.

19 is a diagram showing two signal input states of two input terminals N1 and N2 of the power supply control circuit 150 of the touch display device 100 according to the present embodiments, FIG. 7 is a diagram illustrating two signal input methods for the power supply control circuit 150 according to a signal input state.

19, the signal input states of the ground voltage input terminal N1 and the first power voltage input terminal N2 of the power supply control circuit 150 are two cases (Case 1 and Case 2) during the touch mode period .

Referring to FIG. 19, Case 1 is a case where a signal is input to both the ground voltage input terminal N1 of the power control circuit 150 and the first power voltage input terminal N2 during the touch mode period.

In Case 1, the signal input to the ground voltage input terminal N1 and the first power voltage input terminal N2 of the power supply control circuit 150 is a pulse width modulation signal.

19 and 20, in Case 1, the ground voltage pulse GND_PWM is input as the ground signal GND to the ground voltage input terminal N1 of the power supply control circuit 150, and the power supply control circuit 150, The first power supply voltage pulse VCC_PWM is input as the first power supply voltage VCC1 to the first power supply voltage input terminal N2.

In Case 1, the power supply control circuit 150 can generate various signals by using both the ground voltage pulse GND_PWM and the first power supply voltage pulse VCC_PWM.

Referring to FIG. 19, in the case of Case 1, the power supply control circuit 150 includes a ground voltage pulse GND_PWM input to the ground voltage input terminal N1, a ground voltage pulse GND_PWM input to the first power voltage input terminal N2, The voltage pulse VCC_PWM has the same voltage difference? V1 at all points.

When a signal is inputted to both the ground voltage input terminal N1 of the power supply control circuit 150 and the first power supply voltage input terminal N2 as described above, the input to the ground voltage input terminal N1 of the power supply control circuit 150 The voltage difference between the input signal GND_PWM and the signal VCC_PWM input to the first power voltage input terminal N2 is kept constant so that various signal control of the power supply control circuit 150 can be normally performed.

Referring to FIG. 19, in Case 2, only the ground voltage input terminal N1 of the ground voltage input terminal N1 and the first power voltage input terminal N2 of the power control circuit 150 during the touch mode period has a pulse width And the ground voltage pulse GND_PWM in the form of a modulation signal is input as the ground signal GND.

21, while the ground voltage pulse GND_PWM is input to the ground voltage input terminal N1 of the power supply control circuit 150, the first power voltage input terminal N2 is connected to the ground do.

Therefore, in Case 2, the power supply control circuit 150 can generate various signals using only the ground voltage pulse GND_PWM.

The signal control circuit 1200 may not include the second multiplexer 1520 and may instead supply a first supply voltage VCC_DC in the form of a DC voltage to the first supply voltage input < RTI ID = 0.0 > And a floating circuit 2100 for inputting the first power voltage VCC_DC of the DC voltage type into the first power voltage input terminal N2 of the power control circuit 150 in the touch mode period .

The floating circuit 2100 may be implemented as a multiplexer or a switching device that receives only the first power voltage VCC_DC in the form of a DC voltage and outputs the first power voltage VCC_DC only during a period other than the touch mode period.

The power supply control circuit 150 generates various signals using only the ground voltage pulse GND_PWM by causing the first power voltage input terminal N2 of the power supply control circuit 150 to float in the touch mode period as described above, do. Thus, the signal control process of the power supply control circuit 150 can be simplified.

FIG. 22 is a signal transmission diagram summarizing signal transmission between the respective components in the touch system described above.

22, the touch system (or the touch circuit 190) of the touch display device 100 according to the present embodiments may include a ground voltage pulse GND_PWM, which is a level-converted pulse width modulation signal, A common voltage pulse Vcc_PWM having the same phase as the ground voltage pulse GND_PWM and a display voltage pulse VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM, A common electrode voltage pulse Vcom_PWM and a first display voltage pulse VCC_PWM or VDD_PWM and a touch drive signal TDS corresponding to the common electrode voltage pulse Vcom_PWM, And a second display voltage pulse (e.g., VGH_PWM, VGL_PWM) as a load-free driving signal in the non-active region N / A, 2 < / RTI > Circuit 820, and the like.

The first driving circuit 810 supplies the common electrode voltage pulse Vcom_PWM and the corresponding touch driving signal TDS to the common electrode CEs corresponding to the sensing target sequence, And supplies the common electrode rod pre-driving signal Vcom_LFD corresponding to the pulse Vcom_PWM.

The touch display device 100 according to the above-described embodiments swings the ground voltage GND_DC during the touch mode period, thereby swinging all the signals required for the touch driving and the load-free driving in the same phase.

Therefore, the touch driving and the load-free driving can be provided more simply and efficiently. In addition, it is possible to prevent parasitic capacitors from occurring in not only the active area A / A but also the non-active area N / A, and the sensing accuracy can be further increased.

23 is a diagram showing a touch system when the signal control circuit 1200 is included in the first driving circuit 810 in the touch display device 100 according to the present embodiments, In the case where the signal control circuit 1200 is included in the timing controller 140 in the touch display device 100 according to the first embodiment of the present invention.

As shown in FIG. 23, the signal control circuit 1200 that generates the ground voltage pulse GND_PWM as the ground signal GND may be included in the first driving circuit 810.

The signal control circuit 1200 that generates the ground voltage pulse GND_PWM as the ground signal GND may be included in the timing controller 140 as shown in Fig.

Hereinafter, each of the components of the touch display device 100 will be described in more detail.

25 is a diagram showing a power supply control circuit 150 of the touch display device 100 according to the present embodiments.

25, the power supply control circuit 150 of the touch display device 100 according to the present embodiment includes a ground voltage input terminal N1, a first pulse generator 2510, a second pulse generator 2520 , A first power voltage input terminal N2, and the like.

A ground voltage pulse GND_PWM subjected to pulse width modulation during a touch mode period is input as a ground signal GND to the ground voltage input terminal N1 and a ground voltage GND_DC as a DC voltage is input to the ground voltage input terminal N1 as a ground signal GND ).

The first pulse generator 2510 generates a common electrode voltage pulse Vcom_PWM that is synchronized with the ground voltage pulse GND_PWM and pulse width modulated based on the common electrode voltage Vcom_DC during the touch mode period, And outputs it as a signal Vcom.

Here, the common electrode voltage pulse Vcom_PWM may be used as the touch driving signal TDS and the common electrode rod pre-driving signal Vcom_LFD.

The first pulse generator 2510 may output the common electrode voltage Vcom_DC as the common electrode signal Vcom during the display mode period.

The second pulse generator 2520 generates a display pulse signal having a pulse width modulated based on the display voltages VCC_DC, VDD_DC, VGH_DC, and VGL_DC, which are synchronized with the ground voltage pulse GND_PWM and are DC voltages, Pulses VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM to generate display voltage signals VCC, VDD, VGH, and VGL.

The second pulse generator 2520 may output the display voltages VCC_DC, VDD_DC, VGH_DC and VGL_DC as the display voltage signals VCC, VDD, VGH and VGL during the display mode period.

The common electrode load-free driving signal Vcom_LFD is a load-free driving signal in the active area A / A and the display voltage pulses VCC_PWM, VDD_PWM, VGH_PWM and VGL_PWM are in a non- Pre-drive signal.

The first power voltage input terminal N2 may be a state in which the first power voltage pulse VCC_PWM subjected to the pulse width modulation is input during the touch mode period or may be electrically floating.

The first power voltage VCC_DC, which is a DC voltage, may be input to the first power voltage input terminal N2 during the display mode period.

By using the above-described power supply control circuit 150, efficient power supply control processing for touch driving and load-free driving can be performed.

26 is a diagram showing a signal control circuit 1200 of the touch display device 100 according to the present embodiments.

26, the signal control circuit 1200 of the touch display device 100 according to the present embodiment includes a pulse generator 2610 that generates a ground voltage pulse GND_PWM, a ground voltage GND_DC, And a signal selection circuit 2620 receiving the voltage pulse GND_PWM and selecting one of the ground voltage GND_DC and the ground voltage pulse GND_PWM to output the ground voltage GND_PWM as the ground signal GND.

The signal selection circuit 2620 can select the ground voltage pulse GND_PWM and output it as the ground signal GND during the touch mode period.

The signal selection circuit 2620 receives the first power voltage VCC_DC and the first power voltage pulse VCC_PWM and selects one of the first power voltage VCC_DC and the first power voltage pulse VCC_PWM, It can be outputted as the power supply signal VCC1.

The signal selection circuit 2620 can select the ground voltage pulse GND_PWM as the first power supply voltage pulse VCC_PWM and output it as the first power supply signal VCC1 during the touch mode period

Using the above-described signal control circuit 1200, the touch driving signal TDS in the form of a pulse width modulation signal used in the touch display device 100 and the various load-free driving signals Vcom_LFD, DATA_LFD, GATE_LFD, VCC_PWM, VDD_PWM, VGH_PWM, VGL_PWM, and the like) can be efficiently generated based on the ground voltage pulse GND_PWM.

26, the signal control circuit 1200 may further include a level shifter 1700 for converting the level of the ground voltage pulse GND_PWM output from the pulse generator 2610 and inputting the level of the ground voltage pulse GND_PWM to the signal selection circuit .

Using this level shifter 1700, the ground voltage pulse GND_PWM can be variously adjusted in consideration of performance, efficiency, etc. of the touch driving and the load free driving.

As shown in FIG. 26, the pulse generator 2610 may be, for example, an internal module of the micro control unit 2100.

As shown in FIG. 26, the signal selection circuit 2620 may be implemented, for example, as a first multiplexer 1410 and a second multiplexer 1420.

27 is a diagram showing a first driving circuit 810 of the touch display device 100 according to the present embodiments.

27, the first driving circuit 810 of the touch display device 100 according to the present exemplary embodiment includes a data driving circuit 810 for performing data driving such as a data voltage output and a common voltage output during a display mode period, At least one touch sensing signal detection circuit 220 for sensing a touch sensing signal TSS for touch sensing from a common electrode CEs to which a touch driving signal TDS is applied during a touch mode period, .

Here, the touch sensing signal TSS corresponds to the touch driving signal TDS and the signal waveform. The touch driving signal TDS has the same phase as the phase of the ground voltage pulse GND_PWM in the form of a pulse width modulation signal.

The first driving circuit 810 supplies a touch drive signal TDS to the common electrode CEs to be sensed and a touch drive signal TCL to supply the common electrode rod pre- And load-free driving.

When the first driving circuit 810 described above is used, data driving, touch driving, load-free driving, and touch sensing can all be provided in one driving chip. Accordingly, the number of components can be reduced, and the touch screen panel can efficiently provide data driving, touch driving, and load free driving suitable for a touch structure built in the display panel 110.

Referring to FIG. 27, the first driving circuit 810 of the touch display device 100 according to the present embodiment generates a ground voltage pulse GND_PWM as a reference for generating the touch driving signal TDS (See FIG. 23).

According to the above description, it is possible to provide a first driving circuit 810 capable of generating a ground voltage pulse GND_PWM as a reference for making signals for touch driving and load free driving.

Meanwhile, the first driving circuit 810 of the touch display device 100 according to the present exemplary embodiment may apply a display voltage pulse having a phase corresponding to the ground voltage pulse GND_PWM (for example, VCC_PWM , VDD_PWM, etc.) can be input.

As described above, during the touch mode period, a display voltage pulse (e.g., VCC_PWM, VDD_PWM, etc.) having a phase and an amplitude corresponding to the ground voltage pulse GND_PWM is transmitted to the first driving circuit 810, The potential difference between the touch driving signal TDS and the touch sensing signal TSS having the same phase and amplitude and the display voltage pulse (for example, VCC_PWM, VDD_PWM, etc.) can be reduced or removed from the display voltage pulse (e.g., VCC_PWM , VDD_PWM, and the like) is transferred (the line in the non-active region N / A).

28 is a diagram showing a timing controller 140 of the touch display device 100 according to the present embodiments.

28, the timing controller 140 of the touch display device 100 according to the exemplary embodiments of the present invention includes a mode timing controller 2810 for controlling the timings of the display mode and the touch mode, And a ground voltage pulse GND_PWM in the form of a pulse width modulation signal for sweeping the touch driving signal and the load free driving signal during the touch mode period A signal control circuit 1200, and the like.

According to the above description, it is possible to provide the timing controller 140 capable of generating the ground voltage pulse GND_PWM as a reference for generating various signals required for the touch driving and the load free driving.

29 is a flowchart of a method of driving the touch display device 100 according to the present embodiments.

29, a method of driving a touch display device 100 in which a plurality of common electrodes CE used for touch driving and display driving are embedded in a display panel 110 includes the steps of applying a pulse width modulated ground voltage pulse (S2910) of generating a common electrode voltage pulse (Vcom_PWM) and a display voltage pulse (VCC_PWM, VDD_DC, VGH_DC, VGL_DC) synchronized with the generated ground voltage pulse (GND_PWM) , Proceeding with the touch driving using the common voltage pulse Vcom_PWM (S2920), and the like.

Here, the fact that the common electrode voltage pulse Vcom_PWM and the display voltage pulses VCC_PWM, VDD_DC, VGH_DC, and VGL_DC are synchronized with the ground voltage pulse GND_PWM means that the phases become equal to each other.

By swinging the ground voltage (GND_DC) during the touch mode period, all the signals necessary for the touch driving and the rod-free driving are swung in the same phase so that the touch driving and the load-free driving are efficiently provided can do.

On the other hand, in step S2920, the display voltage pulses VCC_PWM, VDD_DC, VGH_DC, and VGL_DC are applied to at least one of Line On Glass (LOG), Line On PCB (LOP) .

Accordingly, it is possible to effectively prevent the parasitic capacitance from occurring in the non-active region N / A, thereby further increasing the touch sensing accuracy.

30 and 31 are views showing three ground lines (GND A, GDN B, and GND C) in the touch display device 100 according to the present embodiments.

30 and 31, the touch display device 100 according to the present embodiment includes a first ground wiring GND A and a second ground wiring GND B, and a third ground wiring GND C ). ≪ / RTI >

Referring to FIGS. 30 and 31, the first ground line GND A is a line to which a ground voltage GND_DC in the form of a DC voltage is applied. The ground voltage GND_DC in the form of a DC voltage is applied to the first multiplexer 1410 or the micro- To the controller 210.

The second ground wiring GND B electrically connects the output terminal X of the first multiplexer 1410, the input terminal Y of the timing controller 140 and the input terminal Z of the power supply control circuit 150.

Accordingly, the ground signal GND output from the output terminal of the first multiplexer 1410 is applied to the second ground line GNDB.

The ground signal GND applied to the second ground line GND B may be input to the input terminal of the power control circuit 150 and the input terminal of the timing controller 140.

31, when the first ground wiring GND A directly supplies the first ground wiring GND A to the first multiplexer 1410, the first multiplexer 1410 applies the ground voltage pulse GND_PWM Is supplied from the micro control unit 210 and the ground voltage GND_DC in the form of a DC voltage is directly supplied from the first ground line GND A.

Alternatively, when the first ground wiring GND A supplies the DC voltage type ground voltage GND_DC to the micro control unit 210, the first multiplexer 1410 outputs the ground voltage GND_DC in the form of a DC voltage The ground voltage pulse GND_PWM may be all supplied from the microcontroller 210.

31, the first multiplexer 1410 receives the ground voltage GND_DC in the form of a DC voltage supplied from the first ground line GND A or the micro control unit 210 and the ground voltage GND_DC supplied from the micro control unit 210 One of the ground voltage pulses GND_PWM is supplied to the second ground wiring GND B as the ground signal GND.

The timing controller 140 and the power supply control circuit 150 supply the ground voltage GND_DC of the DC voltage form and the ground voltage pulse GND_PWM of the ground voltage GND_PWM through the second ground line GND B, And receives the signal GND.

The power supply control circuit 150 generates a ground voltage GND_DC or a ground voltage pulse GND_PWM corresponding to the ground signal GND input through the second ground line GND B, And outputs the first power supply voltage VCC_DC or the first power supply voltage pulse VCC_PWM in the form of a DC voltage as the first power supply signal VCC or the second power supply voltage VCC_PWM as the common electrode signal Vcom, And outputs a second power supply voltage VDD_DC or a second power supply voltage pulse VDD_PWM in the form of a DC voltage as a second power supply signal VDD and outputs a gate high level voltage VGH_DC in the form of a DC voltage, Outputs the high level voltage pulse VGH_PWM as the gate high level signal VGH and outputs the gate low level voltage VGL_DC or the gate low level voltage pulse VGL_PWM in the form of a DC voltage as the gate low level signal VGL .

30 and 31, the touch display device 100 according to the present embodiment includes a third ground line GND C (not shown) electrically connected to the second ground line GND B and disposed on the display panel 110, ). ≪ / RTI >

The ground voltage GND_DC or the ground voltage pulse GND_PWM corresponding to the ground signal GND applied to the second ground wiring GND B is applied to the third ground wiring GND C ). ≪ / RTI >

31, the third ground wiring GND C may be formed in a closed loop shape along the edge region of the display panel 110, have.

30, the first ground wiring line GND A may be disposed on the first printed circuit board 3010 and the second ground wiring line GND B may be disposed on the second printed circuit board 3020. have. Here, the first printed circuit board 3010 and the second printed circuit board 3020 may be different printed circuit boards or may be integrated into one.

30, the second printed circuit board 3020 and the display panel 110 may be connected to each other through a connection member 3030 such as a flexible flat cable (FFC) May include wiring for electrically connecting the second ground wiring (GND B) and the third ground wiring (GND C).

FIG. 32 is a view showing the role of the common electrode CE according to the display mode and the touch mode in the touch display device 100 according to the present embodiments.

Referring to FIG. 32, the display mode and the touch mode may be performed in the same manner as Case A, Case B, and Case C.

Case A is a case where the display mode and the touch mode are sequentially connected to each other, and Case B and Case C are cases where the display mode and the touch mode are performed independently of each other, and the display mode and the touch mode may be simultaneously performed .

In Case A, the display mode interval and the touch mode interval may be time-divided and separated.

Therefore, at any point in time, the common electrode CE can operate only as a display electrode or as a touch electrode only.

Accordingly, the first driving circuit 810 supplies the common electrode voltage Vcom_DC in the form of a DC voltage to all of the common electrodes CE which serve as the display electrodes during the display mode period, and during the touch mode period, The common electrode voltage pulse Vcom_PWM is sequentially supplied to the plurality of common electrodes CE serving as the touch electrode as the touch driving signal TDS.

Case B and Case C are cases in which the display mode and the touch mode are performed independently of each other, and the display mode and the touch mode may be performed simultaneously, and the display mode interval and the touch mode interval may be independent intervals that overlap in time .

Therefore, in any one of the display mode section and the touch mode section overlapping in time, the common electrode CE also functions as a display electrode and can also function as a touch electrode.

In this manner, when the display mode section and the touch mode section overlap in time, the first driving circuit 810 can supply the common electrode voltage pulse Vcom_PWM to all of the common electrodes CE.

At this time, the common electrode voltage pulse Vcom_PWM supplied to at least one of the plurality of common electrodes CE (common electrode to be a touch target) is a common electrode voltage as a display voltage corresponding to the pixel voltage, (TDS), and the common electrode voltage pulse Vcom_PWM supplied to the remaining common electrode CE is the common electrode voltage as the display voltage corresponding to the pixel voltage and the common electrode rod pre-driving signal Vcom_LFD.

33 is a diagram showing main signals when the display mode and the touch mode are simultaneously performed in the touch display device 100 according to the present embodiments.

33, a power supply control circuit 150 generates a common electrode voltage pulse Vcom_PWM, a first power supply voltage pulse VCC_PWM, and a second power supply voltage pulse VDD_PWM, which are generated and output based on a ground voltage pulse GND_PWM, The gate high level voltage pulse VGH_PWM and the gate low level voltage pulse VGL_PWM have the same phase and the same amplitude (? V or? V * N) as the ground voltage pulse GND_PWM.

When the display mode and the touch mode are simultaneously performed as in Case B and Case C, the common electrode voltage pulse Vcom_PWM may serve as a display voltage corresponding to the pixel voltage for the display mode progression, Signal TDS and a load-free driving signal Vcom_LFD for load-free driving.

The first power supply voltage pulse VCC_PWM, the second power supply voltage pulse VDD_PWM, the gate high level voltage pulse VGH_PWM, the gate low level voltage VGH_PWM, The pulse VGL_PWM serves as a display-voltage for the display mode progression, but also serves as a load-free driving signal for the load-free driving.

FIG. 34 is a view for explaining the principle of display in a display mode that is performed simultaneously with a touch mode in the touch display device 100 according to the present embodiments.

Fig. 34 shows an equivalent circuit schematically showing one subpixel defined by a data line and a gate line, and a pixel electrode Ep connected to the drain node or the source node of the transistor TFT in one subpixel Pixel voltage Vp and a common electrode voltage pulse Vcom_PWM as a common voltage Vcom common to all subpixels.

34, each sub-pixel includes a transistor (TFT) having a source node or a drain node connected to the data line and a drain node or a source node connected to the pixel electrode (Ep), the gate node connected to the gate line, There is a storage capacitor Cst and a liquid crystal capacitor Clc formed between the pixel electrode Ep and the common electrode CE.

The transistor TFT is turned on by the scan signal supplied from the gate line, and supplies the data voltage supplied from the data line to the pixel electrode Ep.

The storage capacitor Cst and the liquid crystal capacitor Cst are connected by the pixel voltage Vp which is the data voltage applied to the pixel electrode Ep and the common electrode voltage pulse Vcom_PWM which is the common voltage Vcom applied to the common electrode CE. (Clc). ≪ / RTI > Accordingly, light may be emitted from the corresponding sub-pixel.

33, the common electrode voltage pulse Vcom_PWM, the ground voltage pulse GND_PWM, and the ground voltage pulse GND_PWM are generated when the display mode section and the touch mode section are temporally overlapped, that is, And display voltage pulses (e.g., VCC_PWM, VDD_PWM, VGH_PWM, and VGL_PWM) have the same phase and amplitude as the ground voltage pulse GND_PWM. In addition, the pixel voltage Vp also has the same phase and amplitude as the ground voltage pulse GND_PWM.

In order to display a desired image in the corresponding subpixel, the voltage corresponding to the potential difference between the pixel electrode Ep and the common electrode CE should be a DC voltage for displaying a desired image.

To this end, even if both the pixel voltage Vp applied to the pixel electrode Ep and the common electrode voltage pulse Vcom_PWM applied to the common electrode CE are not DC voltages as the touch mode and the display mode progress simultaneously, The pixel voltage Vp applied to the pixel electrode Ep and the common electrode voltage pulse Vcom_PWM applied to the common electrode CE maintain the same voltage difference at all the points Ta, Tb, and Tc (ΔVa = The pixel voltage Vp applied to the pixel electrode Ep and the common electrode CE applied to all the points Ta, Tb, and Tc are set to be equal to each other at each of the points Ta, Tb, and Tc when the voltage level swings in the same phase. The voltage corresponding to the voltage difference (? Va,? Vb,? Vc) between the common electrode voltage pulse (Vcom_PWM)

That is, the pixel voltage Vp at the pixel electrode Ep is a pulse width modulated signal having the same phase and the same amplitude as the ground voltage pulse GND_PWM.

At all the points Ta, Tb and Tc, the pixel voltage Vp at the pixel electrode Ep has the same voltage difference as the common electrode voltage pulse Vcom_PWM (? Va =? Vb =? Vc).

Therefore, even if the touch mode and the display mode are simultaneously performed, the corresponding sub-pixel can display a desired image by normally advancing the display mode.

On the other hand, in the case of the case (Case A) in which the touch mode and the display mode are separated by the time division method, the limited time must be divided into two sections (touch mode section and display mode section) It was difficult to achieve the improvement at the same time.

However, as described above, since the progressive mode of Case B and Case C can be normally performed, that is, both the touch mode and the display mode, which are two driving modes of using the common electrode CE, can be performed at the same time , It is possible to simultaneously improve the speed of the touch sensing and the display quality.

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.

100: touch display device 110: display panel
120: Data driving circuit 130: Gate driving circuit
140: timing controller 150: power supply control circuit
190: touch circuit 210: micro control unit
220: Touch sensing signal detection circuit 300: Signal line
810: first driving circuit 820: second driving circuit
1200: Signal control circuit 1410: First multiplexer
1520: Second multiplexer 1700: Level shifter
2510: First pulse generator 2520: Second pulse generator
2610: Pulse generator 2620: Signal selection circuit
2810: Mode timing control unit 2820: Video data output unit

Claims (29)

A display panel having a plurality of common electrodes used for touch driving and display driving;
A power supply control circuit generating and outputting common electrode voltage pulses and display voltage pulses modulated in pulse width in accordance with a ground voltage pulse corresponding to the input pulse width modulation signal;
A first display voltage pulse and a common electrode voltage pulse of the display voltage pulses are sequentially supplied to the plurality of common electrodes in a touch mode period and a touch drive signal corresponding to or corresponding to the common electrode voltage pulse is supplied to the plurality of common electrodes A first driving circuit; And
And a second driving circuit receiving a second display voltage pulse of the display voltage pulses in the touch mode period. The method according to claim 1,
The common electrode voltage pulse, the display voltage pulses, and the touch drive signal,
And a signal having the same phase or amplitude as the ground voltage pulse. The method according to claim 1,
Wherein the first display voltage pulse comprises:
The signal is transferred from the power supply control circuit to the first driving circuit through a signal line in a non-active area,
Wherein the second display voltage pulse comprises:
Wherein the power supply control circuit is connected to the second drive circuit through a signal line in a non-active area. The method according to claim 1,
Wherein the first driving circuit comprises:
Wherein when the touch driving signal is supplied to the common electrode which is the same as the common electrode voltage pulse or corresponds to the common electrode voltage pulse in the touch sensing by sequentially driving the plurality of common electrodes in the touch mode period,
And supplies a common electrode load-free driving signal equal to or corresponding to the common electrode voltage pulse to a common electrode other than the touch sensing object. The method according to claim 1,
Wherein the first driving circuit comprises:
Wherein when the touch driving signal is supplied to the common electrode which is the same as the common electrode voltage pulse or corresponds to the common electrode voltage pulse in the touch sensing by sequentially driving the plurality of common electrodes in the touch mode period,
And supplies a data line load pre-driving signal identical or corresponding to the common electrode voltage pulse to at least one data line. The method according to claim 1,
When the first driving circuit supplies the touch drive signal which is the same as or corresponds to the common electrode voltage pulse to the common electrode to be a touch sensing object,
Wherein the second driving circuit comprises:
And supplies a gate line load-free driving signal identical or corresponding to the common electrode voltage pulse to at least one gate line. The method according to claim 1,
And a signal control circuit for generating the ground voltage pulse and outputting it to the power supply control circuit. 8. The method of claim 7,
Wherein the signal control circuit comprises:
A micro control unit for outputting the ground voltage pulse; And
And a first multiplexer receiving the ground voltage corresponding to the DC voltage and the ground voltage pulse and selecting the ground voltage pulse during the touch mode interval and outputting the selected ground voltage pulse to the power supply control circuit. 9. The method of claim 8,
Wherein the signal control circuit comprises:
And a second multiplexer receiving the first power supply voltage and the ground voltage pulse and selecting the ground voltage pulse as the first power supply voltage pulse for the touch mode period and outputting the selected ground voltage pulse to the power supply control circuit. 9. The method of claim 8,
Wherein the signal control circuit comprises:
And a level shifter for converting the level of the ground voltage pulse output from the micro control unit and outputting the converted level. 9. The method of claim 8,
A first ground line for supplying the ground voltage to the first multiplexer or the micro control unit; And
And a second ground wiring electrically connected to the output terminal of the first multiplexer, the input terminal of the power control circuit, and the input terminal of the timing controller. 12. The method of claim 11,
And a third ground line electrically connected to the second ground line and disposed on the display panel.
The method according to claim 1,
When a signal is input to both the first power supply voltage input terminal and the ground voltage input terminal of the power supply control circuit,
Wherein the signal input to the first power voltage input terminal and the ground voltage input terminal are pulse width modulated signals,
Wherein the signal input to the first power supply voltage input terminal and the ground voltage input terminal have the same voltage difference at all points. The method according to claim 1,
When the display mode and the touch mode are progressed by time division,
Wherein the first driving circuit comprises:
During the display mode period, a common electrode voltage in the form of a DC voltage is supplied to all of the plurality of common electrodes acting as display electrodes,
And sequentially supplies the common electrode voltage pulse to the plurality of common electrodes operating as a touch electrode as a touch driving signal during the touch mode period. The method according to claim 1,
The display mode and the touch mode are performed independently and can be simultaneously performed in time. 16. The method of claim 15,
When the display mode and the touch mode are performed simultaneously,
Wherein the first driving circuit comprises:
And supplies the common electrode voltage pulse to all of the plurality of common electrodes. 17. The method of claim 16,
When the display mode and the touch mode are performed simultaneously,
Wherein the common electrode voltage pulse supplied to at least one of the plurality of common electrodes by the first driving circuit is a touch driving signal and the common electrode voltage pulse supplied to the remaining common electrodes is a touch electrode device. 17. The method of claim 16,
When the display mode and the touch mode are performed simultaneously,
Wherein the common electrode voltage pulse, the ground voltage pulse and the display voltage pulses have the same phase and amplitude as the ground voltage pulse,
The pixel voltage at the pixel electrode,
A pulse width modulated signal having the same phase and the same amplitude as the ground voltage pulse,
And has a voltage difference equal to the common electrode voltage pulse at every point. A method of driving a touch display device in which a plurality of common electrodes used for touch driving and display driving are incorporated in a display panel,
Generating a pulse width modulated ground voltage pulse;
A first step of generating a common electrode voltage pulse and a display voltage pulse synchronized with the ground voltage pulse; And
And a second step of performing touch driving using the common voltage pulse during a touch mode period. 20. The method of claim 19,
In the second step,
Wherein the display voltage pulse is applied to at least one of LOG (Line On Glass), LOP (Line On PCB) and LOF (Line On Film). 20. The method of claim 19,
The second step comprises:
Wherein the common electrode voltage pulse is supplied to all of the plurality of common electrodes in a period in which the display mode section and the touch mode section overlap in time. A ground voltage input terminal to which a ground voltage pulse having been subjected to pulse width modulation is input;
A first pulse generator for generating a common electrode voltage pulse synchronized with the ground voltage pulse and being pulse width modulated based on the common electrode voltage during a touch mode period; And
And a second pulse generator for generating a display voltage pulse synchronized with the ground voltage pulse and pulse width modulated based on the display voltage during the touch mode period. A pulse generator for generating a ground voltage pulse; And
And a signal selection circuit receiving the ground voltage and the ground voltage pulse and selecting one of the ground voltage and the ground voltage pulse,
Wherein the signal selection circuit comprises:
And for selecting and outputting the ground voltage pulse during the touch mode period. 24. The method of claim 23,
And a level shifter for converting the level of the ground voltage pulse output from the pulse generator and inputting the level of the ground voltage pulse to the signal selection circuit. A data driving circuit for performing data driving during a display mode period; And
And a touch sensing signal detecting circuit for sensing a touch sensing signal for touch sensing from a common electrode to which a touch driving signal is applied,
Wherein the touch drive signal has the same phase as the phase of the ground voltage pulse in the form of a pulse width modulated signal. 26. The method of claim 25,
And a signal control circuit for generating the ground voltage pulse. 26. The method of claim 25,
And a display voltage pulse having a phase corresponding to a phase of the ground voltage pulse is input during the touch mode period. A mode timing control unit for controlling the timings of the display mode and the touch mode;
A video data output unit for outputting video data for data driving during a display mode period; And
And a signal control circuit for generating a ground voltage pulse in the form of a pulse width modulation signal for swinging a touch driving signal and a load free driving signal during a touch mode period. A signal control circuit for generating a ground voltage pulse which is a pulse width modulation signal;
A power supply control circuit for generating and outputting a common electrode voltage pulse and a display voltage pulse having the same phase as the ground voltage pulse; And
And a driving circuit that receives the common electrode voltage pulse and the display voltage pulse in a touch mode period and sequentially supplies a touch driving signal corresponding to the common electrode voltage pulse to the common electrodes.

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