KR20170119282A - Touch sensing method, touch sensing circuit, and touch display device - Google Patents

Abstract

In the present exemplary embodiments, a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in a display panel is output to detect a change in capacitance at each of a plurality of touch electrodes, And more particularly, to a touch sensing method, a touch sensing circuit, and a touch display device that perform multi-frequency driving type touch driving that drives a touch electrode while varying a frequency of a touch driving signal. According to the embodiments, it is possible to reduce the EMI phenomenon that may be caused by the touch driving signal, while enabling the touch sensing.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch sensing method, a touch sensing circuit, and a touch display device. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

These embodiments relate to a touch sensing method, a touch sensing circuit, and a touch display device.

2. Description of the Related Art [0002] With the development of an information society, 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 device (OLED) and the like are being utilized.

Among such display devices, there is a touch display device capable of providing 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 a touch-based input method, it is necessary for the touch display device to be able to grasp the presence or absence of a user's touch and accurately detect the touch coordinates (touch position).

For this purpose, the presence or absence of a touch or the touch coordinates, etc., based on the capacitance between the touch electrodes or the capacitance between the touch electrode and the pointer such as a finger through a plurality of touch electrodes disposed as a touch sensor on a touch panel A capacitance touch method is widely used.

On the other hand, electronic devices such as a touch display device having a touch sensing function must satisfy a condition that a level of EMI (Electro Magnetic Interference) (hereinafter referred to as " EMI "

However, the conventional touch display device has a problem that the level of EMI is significantly increased due to a touch driving signal for touch sensing.

In particular, when the touch driving signal applied to the touch electrode for touch sensing is a pulse type signal having a predetermined frequency, the EMI can be further increased.

Due to the EMI effect, the system stability of the touch display device is deteriorated, the touch sensing performance is deteriorated due to the sensing voltage obtained during the touch sensing, and the display performance is deteriorated due to the influence of other voltages required for the display. .

In such a background, the present embodiments can provide a touch sensing method, a touch sensing circuit, and a touch display device capable of improving EMI (Electro Magnetic Interference) level.

The embodiments of the present invention can provide a touch sensing method, a touch sensing circuit, and a touch display device that can prevent the generation of unnecessary parasitic capacitance while improving the EMI level in a touch interval.

The present embodiments can provide a touch sensing method, a touch sensing circuit, and a touch display device capable of performing multi-frequency driving type touch driving that enables EMI improvement.

In the present exemplary embodiments, a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in a display panel is output to detect a change in capacitance at each of a plurality of touch electrodes, A touch sensing method, a touch sensing circuit, and a touch display device that perform touch driving of a multi-frequency driving system that drives a touch electrode while varying a frequency of a touch driving signal can be provided.

The present embodiments include a display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, And a touch mode for touch sensing can be provided.

The touch display device includes a touch sensing circuit for outputting a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in a display panel and a plurality of touch electrodes, . ≪ / RTI >

The frequency of the touch driving signal output from the touch sensing circuit can be varied.

The embodiments can provide a touch sensing method of a touch display device.

Such a touch sensing method includes a touch driving step of outputting a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in a display panel during one touch interval or two or more touch intervals .

In addition, the touch sensing method may include a touch sensing step of sensing a capacitance change in each of the plurality of touch electrodes and sensing the touch presence or touch position.

The frequency of the touch driving signal outputted in the above-described touch driving step may be varied.

In another aspect, the present embodiments can provide a touch sensing circuit included in a touch display device.

The touch sensing circuit may include a driver for outputting a pulse type touch driving signal for sequentially driving at least one of the plurality of touch electrodes built in the display panel.

The touch sensing circuit may include a sensing unit sensing a capacitance change in each of the plurality of touch electrodes and sensing a touch position or a touch position.

The frequency of the touch driving signal output from the driving unit described above can be varied.

The present embodiments can provide a touch sensing circuit included in a touch display device having two operation modes including a display mode for displaying images and a touch mode for touch sensing.

Such a touch sensing circuit may output a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes for touch sensing.

Here, the frequency of the output touch driving signal can be varied.

There may be a rest period in which a touch driving signal is not output in a section for touch sensing.

For example, in a period during which the pulses are not output in one or more of the pulses corresponding to the touch driving signal in each section for the touch sensing (e.g., each touch section or each unit touch section in the touch section) May exist. This idle period can help to stabilize the rapidly changing voltage state in the touch electrode TE according to the section change.

The lengths of the idle periods in each section for touch sensing may be equal to each other.

The lengths of the idle periods in the respective sections for the touch sensing may be different from each other.

When the display period for the display mode and the touch period for the touch mode are separated in time and alternately progressed, the frequencies of the touch driving signals output in one touch period may be two or more.

The display period for the display mode and the touch period for the touch mode are alternately and temporally separated. In the first touch period and the second touch period in which one or more display periods exist, And the frequency of the touch driving signal output in the second touch period may be different from each other.

When there is one display period and one touch period in one display frame period, the frequencies of the touch driving signals output in one touch period may be two or more.

When there are two or more display periods and two or more touch intervals in one display frame interval, the frequencies of the touch driving signals output in one touch interval may be two or more.

When there are two or more display periods and two or more touch intervals in one display frame interval, the frequency of the touch driving signal output in one touch interval is one, and the frequency of the touch driving signal output in one display frame interval is It can be more than two.

The segment lengths of the two or more display segments for the display mode may be equal to each other.

The section lengths of two or more display sections for the display mode may be different from each other.

The lengths of two or more touch intervals for the touch mode may be equal to each other.

The lengths of two or more touch intervals for the touch mode may be different from each other.

When two or more display periods for a display mode include an m-th display period and an n-th display period, and two or more touch intervals for a touch mode include an m-th touch period and an n-th touch period, The m-th touch region is advanced to the n-th display region, and the n-th touch region is performed after the n-th display region.

In this case, the sum of the section length of the m-th display section and the section length of the m-th touch section may be equal to the sum of the section length of the n-th display section and the section length of the n-th touch section.

If there are two or more display intervals for a display mode and two or more touch intervals for a touch mode in one display frame interval, the interval lengths of two or more display intervals may be equal to each other.

When there are two or more display periods for a display mode and two or more touch intervals for a touch mode in one display frame period, the interval length of at least one display interval of two or more display intervals is different from the interval length of other display intervals .

If there are two or more display periods for the display mode and two or more touch intervals for the touch mode in one display frame interval, the interval lengths of the two or more touch intervals may be equal to each other.

If there are two or more display periods for the display mode and two or more touch intervals for the touch mode in one display frame interval, the interval length of at least one touch interval of the two or more touch intervals may be different.

When there are two or more display periods for the display mode and two or more touch intervals for the touch mode in one display frame period, the number of pulses of the touch driving signal in at least one touch interval of the two or more touch intervals is different in the touch interval May be different from the number of pulses of the touch driving signal.

When there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame interval, the number of frequency of the touch driving signal output during one display frame interval is within one display frame interval It may be less than the number of touch intervals.

When there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame interval, the number of frequency of the touch driving signal output during one display frame interval is within one display frame interval The number of touch intervals may be exceeded.

The frequency pattern of the touch driving signal can be changed by one period of one display frame.

The frequency pattern of the touch driving signal may change in a period of 1 / M (M: 2 or more natural number) of one display frame period.

According to the embodiments as described above, it is possible to provide a touch sensing method, a touch sensing circuit, and a touch display device capable of improving EMI (Electro Magnetic Interference) level.

This can prevent system stability due to EMI, display performance, and deterioration of touch sensing performance.

According to the embodiments, it is possible to provide a touch sensing method, a touch sensing circuit, and a touch display device that can prevent the generation of unnecessary parasitic capacitance while improving the EMI level in a touch interval.

According to the embodiments, it is possible to provide a touch sensing method, a touch sensing circuit, and a touch display device capable of performing touch driving of a multi-frequency driving system (frequency variable system) enabling improvement of EMI.

1 is a schematic system configuration diagram of a touch display device according to the present embodiments.
FIG. 2 is a diagram illustrating signals applied to the touch electrode in the display period and the touch period in the touch display device according to the present embodiments. Referring to FIG.
3 is a view illustrating a display section and a touch section according to the V-sensing method of the touch display apparatus according to the present embodiments.
4 is a diagram illustrating a display period and a touch period according to the H-sensing method of the touch display device according to the present embodiments.
5 is a diagram illustrating parasitic capacitance components generated in the touch display device according to the present embodiments.
6 is a diagram illustrating a load-free driving of the touch display device according to the present embodiments.
FIG. 7 is a diagram showing EMI (Electro Magnetic Interference) measurement results in a touch section of the touch display device according to the present embodiments.
8 is a view for explaining multi-frequency driving for improving EMI of the touch display device according to the present embodiments.
9 is a view for explaining signal characteristics of a touch driving signal in a unit touch period in which a single frequency touch driving signal is outputted in order to explain the multi-frequency driving characteristic of the touch display device according to the present embodiments.
10 is a view illustrating a case where the touch display device according to the present embodiments performs multi-frequency driving by varying the frequency of a touch driving signal for each touch interval.
11 is a diagram illustrating a frequency varying method based on the number of pulses in a unit touch interval when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of the touch driving signal for each touch interval.
12 is a diagram illustrating a frequency varying method based on the interval length of a unit touch interval when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of the touch driving signal per touch interval.
13 is a diagram illustrating load-free driving when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal for each touch interval.
FIG. 14 is a diagram illustrating a case where the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal within a touch interval.
15 is a diagram illustrating a frequency varying method based on the number of pulses in a unit touch period when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal within a touch interval.
16 is a diagram illustrating a frequency varying method based on the interval length of a unit touch interval when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal within a touch interval.
FIG. 17 is a diagram illustrating load-free driving when the touch display apparatus according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal within a touch interval.
FIGS. 18 and 19 are views showing a case where the touch display device according to the present embodiments performs multi-frequency driving under the V-sensing scheme.
20 and 21 are views showing a case where the touch display device according to the present embodiments performs multi-frequency driving under the H-sensing method.
22 is a flowchart of a touch sensing method of the touch display device according to the present embodiments.
23 and 24 are diagrams showing a touch sensing circuit of the touch display device according to the present embodiments.
25 is a view showing an effect of EMI improvement of the touch display device according to the present embodiments.
26 is a driving example when the touch display device according to the present embodiments is driven by the H-sensing method.
FIG. 27 is an exemplary diagram illustrating application of multi-frequency driving in one touch period when the touch display device according to the present embodiments performs multi-frequency driving in the H-sensing manner.
28 is a timing chart illustrating a case where the touch display apparatus according to the present embodiments performs the multi-frequency driving in the H-sensing manner and applies the single-frequency driving in one touch period, Fig.
29 is a graph showing the relationship between the frequency of the touch driving signal used in one display frame period and the frequency of the touch driving signal used in one display frame period when the touch display device according to the present embodiments is driven by the H- Fig.
30 is a graph showing the relationship between the frequency of the touch driving signal used in one display frame period and the frequency of the touch driving signal used in one display frame period when the touch display device according to the present embodiments is driven by the H- Fig.
31 is a graph showing the relationship between the frequency of the touch driving signal used in one display frame period and the frequency of the touch driving signal used in one display frame period when the touch display device according to the present embodiments is driven by the H- Fig.
FIG. 32 is an example of a display interval and a touch interval when the touch display device according to the present embodiments is driven by the H-sensing method and multi-frequency driving is applied within one display frame interval.
FIG. 33 is a diagram illustrating another example in which the touch display device according to the present embodiments is driven by the H-sensing method and the display interval and the touch interval are allocated when multi-frequency driving is applied within one display frame interval.
FIG. 34 is a diagram illustrating a case where the touch display device according to the present embodiments is driven by the H-sensing method, and when multi-frequency driving is applied within one display frame period, Fig.
FIG. 35 is a diagram for explaining a case where the touch display device according to the present embodiments is driven by the H-sensing method, and when multi-frequency driving is applied within one touch period, the signal applied to the touch electrode in the multi- Fig.
36A is a graph showing the relationship between a pulse application period and a pulse application period in a touch section that is a single-frequency driven operation when the touch display apparatus according to the present embodiments is driven by the H-sensing method and multi- And a rest period (pulse non-application period).
FIG. 36B is a diagram showing a pulse application period and a rest period (non-pulse application period) between unit touch intervals when multi-frequency driving is applied within one touch interval in the touch display device according to the present embodiments.
37 is a timing chart for explaining a case where the touch display device according to the present embodiments is driven in the H-sensing manner and multi-frequency driving is applied within one display frame period, Pulse application period).
FIG. 38 is a timing chart showing the operation of the touch display device according to the present embodiments when the touch display device is driven by the H-sensing method and multi-frequency driving is applied within one display frame period. Pulse application period).
FIGS. 39 and 40 show a case where the touch display device according to the present embodiments is driven by the H-sensing method and multi-frequency driving is applied within one display frame period, And also shows an example of utilization of the idle period (non-pulse application period).
FIG. 41 is another driving example of the case where the touch display device according to the present embodiments is driven by the H-sensing method.
FIG. 42 shows a case where the touch display device according to the present embodiments is driven as shown in FIG. 41, when multi-frequency driving is applied within one display frame period, Fig.
FIG. 43 is another driving example of the case where the touch display device according to the present embodiments is driven by the H-sensing method.
FIG. 44 shows a case where the touch display device according to the present embodiment is driven as shown in FIG. 43, when multi-frequency driving is applied within one display frame period, Fig.
FIG. 45 is another driving example of a case in which the touch display device according to the present embodiments is driven by the H-sensing method.
FIG. 46 is a diagram illustrating a case where the touch display device according to the present embodiments is driven as shown in FIG. 45, when multi-frequency driving is applied within one display frame period, Fig.

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 schematic system configuration diagram of a touch display device 100 according to the present embodiments. 2 is a diagram showing signals applied to the touch electrode TE in the display period DS and the touch period TS in the touch display device 100 according to the present embodiments.

The touch display device 100 according to the present embodiment is characterized in that a plurality of data lines DL and a plurality of gate lines GL are arranged and defined by a plurality of data lines DL and a plurality of gate lines GL And a display panel 110 on which a plurality of sub-pixels SP are arranged.

The touch display device 100 according to the present embodiment has two operation modes including a display mode for displaying an image and a touch mode for touch sensing.

The touch display device 100 according to the present embodiments may include a data driver (not shown) and a gate driver (not shown) for operating in a display mode.

A data driver (not shown) drives a plurality of data lines DL and a gate driver (not shown) drives a plurality of data lines DL during a display period DS during which the touch display apparatus 100 according to the present embodiment operates in a display mode. And drives a plurality of gate lines GL.

The touch display device 100 according to the present embodiments may include a touch sensing circuit 120 or the like to operate in a touch mode.

The touch sensing circuit 120 may sense at least one of the plurality of touch electrodes TE electrically connected through the signal line during the touch period TS during which the touch display device 100 according to the present embodiments operates in the touch mode It is possible to output a touch driving signal TDS of a pulse type (for example, a pulse width modulation (PWM) signal type) for sequentially driving to sense a touch or a touch position.

For example, the touch sensing circuit 120 sequentially drives at least one of the plurality of touch electrodes TE to sequentially change a capacitance of each touch electrode TE based on a signal received through the respective touch electrodes TE, And to sense the presence or absence of touch or the touch position.

That is, the touch sensing circuit 120 may sense the presence or absence of a touch or the touch position using a self-capacitance based touch sensing method.

A plurality of touch electrodes TE serving as a touch sensor may be disposed on a touch panel (not shown) separately provided outside the display panel 110, As shown in FIG.

When a plurality of touch electrodes TE are embedded in the display panel 110, the plurality of touch electrodes TE are arranged in an in-cell type or an on-cell type. .

Meanwhile, when the touch display device 100 according to the present embodiments operates in the display mode, the common voltage Vcom may be applied to all the sub-pixels.

To this end, a common voltage electrode to which the common voltage Vcom is applied may be disposed on the display panel 110.

When a plurality of touch electrodes TE are embedded in the display panel 110, the plurality of touch electrodes TE may be used as a common voltage electrode to which the common voltage Vcom is applied during the display period DS.

Here, when the touch display device 100 is a liquid crystal display device, the common voltage Vcom is used to express the gray level of each subpixel by making a potential difference with the pixel voltage (corresponding to the data voltage) of each subpixel.

2, in the touch display device 100 according to the present embodiment, a plurality of touch electrodes TE are used as a common voltage electrode, as described above, May serve as a common voltage electrode during the display period DS and serve as a touch sensor during the touch period TS.

Referring to FIG. 2, the display period DS and the touch period TS may be defined as one display frame period by time division.

According to a method of time-dividing one display frame section into a display section DS and a touch section TS, the touch sensing method includes a V-sensing method as shown in FIG. 3 and an H-sensing method as shown in FIG. can do.

FIG. 3 is a diagram illustrating a display period DS and a touch interval TS according to the V-sensing scheme of the touch display device 100 according to the present embodiments. FIG. (DS) and a touch interval (TS) according to the H-sensing method of the touch panel 100 according to an embodiment of the present invention.

Referring to FIG. 3, in the case of the V-sensing method, one display frame section is time-divided into one display section DS and one or more touch sections TS.

During one display period DS, the touch display apparatus 100 performs display driving for one display frame.

During one or more touch intervals (TS), the touch display device (100) senses presence or absence of a touch in one display frame area.

Referring to FIG. 4, in the case of the H-sensing method, one display frame section is time-divided into two or more display sections DS and two or more touch sections TS.

During two or more display periods DS, the touch display apparatus 100 performs display driving for one display frame.

During two or more touch periods (TS), the touch display device (100) senses presence or absence of a touch in one display frame area.

Referring to FIGS. 3 and 4, the display period DS and the touch period TS may be defined by a synchronization signal SYNC.

The synchronization signal SYNC is generated in a control configuration such as a timing controller and is supplied to a circuit (e.g., a data driver, a gate driver) for driving a display and a circuit (e.g., a touch sensing circuit 120 ), Etc.).

3 and 4, in the synchronization signal SYNC, the high level section (or the low level section) corresponds to the display section DS and the low level section (or the high level section) corresponds to the touch section TS. .

5 is a diagram showing parasitic capacitance components (Cp1, Cp2, Cp3) generated in the touch display device 100 according to the present embodiments.

5, when the touch driving signal TDS is applied to one or two or more touch electrodes TEs during the touch period TS, the touch electrodes TEs to which the touch driving signal TDS is applied are turned on, The data line DL and the parasitic capacitance Cp1 are formed and the gate line GL and the parasitic capacitance Cp2 are formed and the other touch electrode TEo to which the touch drive signal TDS is not applied and the parasitic capacitance Cp2 The capacitance Cp3 can be formed.

Thus, the parasitic capacitances Cp1, Cp2, and Cp3 generated during the touch period TS may act as a load during touch sensing, which may be a major factor for lowering the sensing accuracy.

Therefore, when the touch display device 100 according to the present embodiment sequentially drives at least one of the plurality of touch electrodes TE during the touch period TS, It is possible to perform load free driving which prevents or reduces the capacitances Cp1, Cp2, and Cp3 from occurring.

6 is a diagram showing a load-free driving of the touch display device 100 according to the present embodiments.

6, when a touch driving signal TDS is applied to at least one touch electrode TEs during a touch period TS, the touch display device 100 according to the present embodiment is configured to apply a voltage Free driving signal D_LFDS to all or part of the driving signal DL.

Some of the data lines DL to which the load-free driving signals D_LFDS are applied among the plurality of data lines DL are connected to the data lines DL arranged at positions corresponding to the touch electrodes TEs to which the touch driving signals TDS are applied. Lt; / RTI >

The load-free driving signal D_LFDS applied to all or part of the data line DL may be a touch driving signal TDS or a signal corresponding to the touch driving signal TDS.

When the load-free driving signal D_LFDS corresponds to the touch driving signal TDS, the load-free driving signal D_LFDS has the same frequency as the frequency of the touch driving signal TDS, And may have the same amplitude as the amplitude of the touch driving signal TDS.

Accordingly, no potential difference is generated between the touch electrode TEs to which the touch driving signal TDS is applied and the data line DL to which the load-free driving signal D_LFDS is applied, so that the touch driving signal TDS is applied It is possible to prevent the parasitic capacitance Cp1 from being formed between the touch electrode TEs and the data line DL to which the load-free driving signal D_LFDS is applied.

6, when a touch driving signal TDS is applied to at least one touch electrode TEs during a touch period TS, the touch display apparatus 100 according to the present embodiment may include a plurality of gate lines Free driving signal G_LFDS to all or part of the driving signal GL.

A portion of the gate line GL to which the load-free driving signal G_LFDS is applied among the plurality of gate lines GL is connected to the gate line GL disposed at a position corresponding to the touch electrode TEs to which the touch driving signal TDS is applied. Lt; / RTI >

The load-free driving signal G_LFDS applied to all or part of the gate line GL may be a touch driving signal TDS or a signal corresponding to the touch driving signal TDS.

When the load-free driving signal G_LFDS corresponds to the touch driving signal TDS, the load-free driving signal G_LFDS has the same frequency as the frequency of the touch driving signal TDS and the phase of the touch driving signal TDS And may have the same amplitude as the amplitude of the touch driving signal TDS.

Accordingly, no potential difference is generated between the touch electrode TEs to which the touch driving signal TDS is applied and the gate line GL to which the load-free driving signal G_LFDS is applied, so that the touch driving signal TDS is applied The parasitic capacitance Cp2 can be prevented from being formed between the touch electrode TEs and the gate line GL to which the load-free driving signal G_LFDS is applied.

Referring to FIG. 6, the touch display device 100 according to the present embodiment is configured to apply a touch driving signal (TDS) to at least one touch electrode TEs during a touch period TS, Free driving signal T_LFDS to the other touch electrode TEo to which the TDS is not applied.

The other touch electrode TEo to which the load-free driving signal T_LFDS is applied among the plurality of touch electrodes TE is connected to the touch electrode TE arranged adjacent to the touch electrode TEs to which the touch drive signal TDS is applied, Or may be all other touch electrodes TE.

The rod-free driving signal T_LFDS applied to the other touch electrode TEo may be a touch driving signal TDS or a signal corresponding to the touch driving signal TDS.

When the load-free driving signal T_LFDS corresponds to the touch driving signal TDS, the load-free driving signal T_LFDS has the same frequency as the frequency of the touch driving signal TDS and the phase of the touch driving signal TDS And may have the same amplitude as the amplitude of the touch driving signal TDS.

Accordingly, no potential difference is generated between the touch electrode TEs to which the touch driving signal TDS is applied and the other touch electrode TEo to which the rod-free driving signal T_LFDS is applied, so that the touch driving signal TDS is applied It is possible to prevent the parasitic capacitance Cp3 from being formed between the touch electrode TEs to which the load-free driving signal T_LFDS is applied and the other touch electrode TEo to which the load-free driving signal T_LFDS is applied.

The load-free driving signals T_LFDS, D_LFDS and G_LFDS may be completely or substantially the same signals as the touch driving signal TDS, and may eliminate or reduce the parasitic capacitance between the touch electrode TE, It may be a signal different from or similar to the touch driving signal TDS.

Here, the fact that the load-free driving signals T_LFDS, D_LFDS, G_LFDS and the touch driving signal TDS are completely equal means that the frequency, phase, amplitude, and all other signal characteristics are completely the same.

The fact that the load-free driving signals T_LFDS, D_LFDS and G_LFDS and the touch driving signal TDS are substantially equal means that the phase, amplitude, and phase of the load-free driving signals T_LFDS, D_LFDS and G_LFDS and the touch driving signal TDS, All other signaling features, etc. may be substantially the same. "Substantially equal" means that, even though the two values are actually different, if the other degree is within a predefined tolerance margin, the two values are considered to be the same. For example, the allowable margin may be ± 20%, ± 10%, ± 5%, ± 1%, and so on.

Even if the load-free driving unit (e.g., the touch sensing circuit 120, the data driving circuit, the gate driving circuit, and the like) outputs the load-free driving signals T_LFDS, D_LFDS, and G_LFDS completely the same as the touch driving signal TDS, Free driving signals T_LFDS, D_LFDS, and G_LFDS actually applied to the other touch electrode TE, the data line DL, or the gate line GL owing to the characteristics of the panel such as an RC (Resistive-Capacitive Delay) The phase, voltage (amplitude), or signal waveform (signal shape) may be different from the phase, voltage (amplitude), or signal waveform (signal shape) of the touch driving signal TDS.

As described above, the degree of difference between the output state of the load-free driving signals T_LFDS, D_LFDS, and G_LFDS and the actual application state may differ depending on the panel position.

Considering that the output state of the load-free drive signal LFDS differs from the actual application state in accordance with the panel characteristics, the application position, and the like, the actually applied load-free drive signals T_LFDS, D_LFDS and G_LFDS are actually applied The output state of the touch driving signal TDS or the load free driving signals T_LFDS, D_LFDS, and G_LFDS can be adjusted and output so as to be equal to the touch driving signal TDS.

Therefore, the touch-driving signal TDS output from the touch sensing circuit 120 and the load-free driving signal (e.g., a signal) output from the load-free driving circuit (e.g., the data driving circuit, the gate driving circuit, or the touch sensing circuit 120) (Amplitudes) and signal waveforms (signal shapes) may be the same or at least one of the phase, the voltage (amplitude), and the signal waveform (signal shape) may be different from each other It is.

On the other hand, during the touch period TS, the touch display apparatus 100 uses a touch driving signal TDS having a pulse type of a single frequency (e.g., several tens of kHz to several hundreds of kHz) When at least one of them is sequentially driven, EMI (Electro Magnetic Interference) may occur in harmonic frequency components as the voltage level of the touch driving signal TDS changes.

Particularly, the touch display device 100 is provided with a plurality of touch electrodes TE among the plurality of touch electrodes TE using a touch drive signal TDS of a pulse type of a single frequency (e.g., several tens of kHz to several hundreds of kHz) At least one of the data lines DL and the gate lines GL is sequentially driven and the load-free driving is further performed on at least one of the other touch electrodes TEo, the data lines DL and the gate lines GL, EMI < RTI ID = 0.0 > due to < / RTI >

FIG. 7 is a graph showing EMI (Electro Magnetic Interference) measurement results in the touch period TS of the touch display device 100 according to the present embodiments.

7, when the touch display device 100 drives the touch electrode TE using a touch driving signal TDS having a single frequency of 100 KHz, EMI may occur in the AM (Amplitude Modulation) frequency range (eg, approximately 500 KHz to approximately 1,605 KHz).

7 is a graph showing the measured upper limit value 710 and the measured average value 720 of the EMI signal for each frequency by measuring the signal intensity of the EMI signal for each frequency.

As a result of the measurement, it can be seen that there is a point 712 at which the measurement upper limit value 710 of the EMI signal appears larger than the upper limit value 711 which is the upper limit value for satisfying the EMI condition in the AM frequency range.

As a result of the measurement, it can be seen that there is a point 722 where the measured average value 720 of the EMI signal is larger than the reference average value 721, which is an average value for satisfying the EMI condition in the AM frequency region.

That is, as a result of the measurement, in the AM frequency region, there may occur a situation where the upper limit measurement value 710 and the measured average value 720 of the EMI signal do not satisfy the EMI condition.

Accordingly, the touch display apparatus 100 according to the present embodiments can provide a multi-frequency driving method in order to reduce the EMI phenomenon caused by the touch driving signal TDS.

8 is a diagram for explaining multi-frequency driving for improving EMI of the touch display device 100 according to the present embodiments.

Referring to FIG. 8, the touch sensing circuit 120 of the touch display device 100 according to the present embodiment changes a frequency of the touch driving signal TDS and outputs a touch driving signal TDS having two or more frequencies To drive the touch electrode TE.

Each touch electrode TE is electrically connected to the touch sensing circuit 120 through a signal line SL. Accordingly, the touch sensing circuit 120 applies the touch driving signal TDS to the touch electrode TE through the signal line SL.

This touch driving method corresponds to a "multi-frequency driving" method in which the frequency of the touch driving signal TDS for driving the touch electrode TE is two or more.

According to such multi-frequency driving, the frequency of the touch driving signal TDS outputted from the touch sensing circuit 120 can be varied.

As described above, according to the multi-frequency driving, as the frequency of the touch driving signal TDS output from the touch sensing circuit 120 is varied, an EMI dispersion phenomenon occurs and an EMI phenomenon caused by the touch driving signal TDS Can be mitigated.

As described above, the present embodiments disclose a touch sensing method, a touch sensing circuit 120, and a touch display device 100 capable of performing touch driving and reducing EMI by using a multi-frequency driving method. do.

Here, the multi-frequency driving method is a touch driving method by varying the frequency of the touch driving signal. The frequency varying of the touch driving signal is a technique of adjusting a section length of a section (unit touch section) using a single frequency, And the number of pulses is controlled in a section using the pulse duration.

Hereinafter, multi-frequency driving for driving the touch electrode TE using the touch driving signal TDS having two or more frequencies through the frequency variation of the touch driving signal TDS will be described in more detail.

9 is a graph showing the relationship between the touch driving signal (UTS) in a unit touch period (UTS) in which the touch driving signal (TDS) of a single frequency is outputted, TDS) according to an embodiment of the present invention.

When the touch electrode TE is multi-frequency driven by using the touch driving signal TDS having two or more frequencies through the frequency variation of the touch driving signal TDS, the touch driving signal TDS of a single frequency is used And there is a section for driving the touch electrode TE. This interval is called a unit touch interval (UTS).

9 is a diagram showing a touch driving signal TDS in the unit touch period UTS.

Referring to FIG. 9, the unit touch section UTS has a predetermined section length T. In FIG. The pulse-type touch driving signal TDS output from the touch sensing circuit 120 in the unit touch period UTS has a predetermined frequency F and a number N of pulses.

The pulse type touch driving signal TDS output from the touch sensing circuit 120 in the unit touch period UTS has a duty ratio defined by the length x of the high level interval and the length y of the low level interval, And has a duty ratio.

The duty ratio of the touch driving signal TDS is x / (x + y) and may be different for each unit touch period UTS (i.e., when the unit touch period UTS is changed to another unit touch period UTS) The ratio may vary) and may be the same in all unit touch intervals (UTS).

Hereinafter, for example, it is assumed that the duty ratio of the touch driving signal TDS is 50%, which is the same in all unit touch periods (UTS). That is, it is assumed that the length (x) of the high level section and the length (y) of the low level section are the same in the touch driving signal TDS.

10 to 13 are diagrams illustrating a case where the touch display device 100 according to the present embodiment performs multi-frequency driving by varying the frequency of the touch driving signal TDS for each touch period TS, 14 to 17 are views showing a case where the touch display device 100 according to the present embodiment performs multi-frequency driving by varying the frequency of the touch driving signal TDS within the touch interval TS.

The multi-frequency driving method can be changed according to how a unit touch section (UTS) is allocated.

As shown in FIGS. 10 to 13, one touch interval TS may correspond to one unit touch interval UTS.

In this way, when one unit touch period (UTS) exists in one touch period (TS), in one touch period (TS) corresponding to one unit touch period (UTS) The frequency is the same, and the frequency of the touch driving signal TDS can be varied for each touch period TS.

Alternatively, as shown in FIGS. 14 to 17, one touch interval TS may correspond to two or more unit touch intervals UTS.

As described above, when two or more unit touch periods UTS exist in one touch period TS, the frequency of the touch drive signal TDS is varied for each unit touch period UTS within one touch period TS. .

The touch driving signal TDS output from each of the two or more unit touch periods UTS when there are two or more unit touch periods UTS to which the touch driving signal TDS of the same frequency is output in accordance with the multi- Are different from each other in frequency.

The frequency of the touch driving signal TDS output from each of the two or more unit touch periods UTS is determined by the interval length T of the unit touch period UTS and the touch driving signal TDS (N) of the number of pulses.

According to the first method for frequency variation, the interval length T of each of the two or more unit touch periods UTS is the same, and the number of pulses of the touch drive signal TDS in each of the two or more unit touch periods UTS N may be different from each other.

According to the second method for frequency variation, the interval lengths T of two or more unit touch intervals UTS are different from each other and the number of pulses of the touch drive signal TDS in each of the two or more unit touch intervals UTS N) may be the same.

Hereinafter, the multi-frequency driving method according to the allocation method of the unit touch period (UTS) will be described in more detail.

First, referring to FIGS. 10 to 13, a multi-frequency driving method for a case where one touch interval (TS) corresponds to one unit touch interval (UTS) will be described.

Referring to FIG. 10, the first unit touch period UTS1 for outputting the touch driving signal TDS1 of the first frequency F1 and the second unit for outputting the touch driving signal TDS2 of the second frequency F2, The touch section UTS2 exists corresponding to the first touch section TS1 and the second touch section TS2.

The first frequency F1 of the touch drive signal TDS1 in the first unit touch period UTS1 and the second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 are different from each other.

The first frequency F1 of the touch driving signal TDS1 in the first unit touch period UTS1 corresponds to the first period T1 of the first unit touch period UTS1 and the pulse number T1 of the first unit touch period UTS1 Can be defined by the following equation (1) by the equation (N1).

The second frequency F2 of the touch driving signal TDS2 in the second unit touch period UTS2 corresponds to the interval length T2 of the second unit touch period UTS2 and the pulse number T2 of the second unit touch period UTS2 (N2). &Quot; (2) "

The number of pulses N of the touch driving signal TDS or the interval length T of each unit touch interval UTS is adjusted in each unit touch interval UTS so that the unit touch interval UTS The frequency F of the touch driving signal TDS can be efficiently varied.

The frequency F of the touch driving signal TDS can be varied by adjusting the number N of pulses of the touch driving signal TDS in each unit touch period UTS as shown in FIG.

According to the frequency variable method based on the number of pulses, the interval length T1 of the first unit touch interval UTS1 and the interval interval T2 of the second unit touch interval UTS2 are the same, and the first unit touch interval The pulse number N1 of the touch driving signal TDS1 in the first unit touch period UTS1 is different from the pulse number N2 of the touch drive signal TDS2 in the second unit touch period UTS2.

Referring to FIG. 11, during the second unit touch period UTS2 of the interval length T2 equal to the interval length T1 of the first unit touch interval UTS1, The second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 is output by outputting the touch drive signal TDS2 having the number of pulses N2 smaller than the pulse number N1 of the signal TDS1, Can be made lower than the first frequency F1 of the touch driving signal TDS1 in the first unit touch period UTS1.

As described above, according to the frequency variable method based on the number of pulses, since the section lengths T of the unit touch periods UTS are the same, the frequency components are dispersed evenly in terms of time, The EMI reduction effect due to dispersion can be further obtained.

12, the frequency F of the touch driving signal TDS can be varied by adjusting the section length T of each unit touch section UTS.

According to the frequency variable method based on the interval length, the number of pulses N1 of the touch driving signal TDS1 in the first unit touch period UTS1 and the number of pulses N1 of the touch drive signal TDS2 in the second unit touch period UTS2, The pulse number N2 of the unit touch period UTS1 is the same and the interval length T1 of the first unit touch interval UTS1 is different from the interval length T2 of the second unit touch interval UTS2.

Referring to FIG. 12, in the first unit touch period UTS1 during the second unit touch period UTS2 of the segment length T2 longer than the segment length T1 of the first unit touch period UTS1, The second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 is output by outputting the touch drive signal TDS2 having the number of pulses N2 equal to the pulse number N1 of the signal TDS1, Can be made lower than the first frequency (F1) of the touch driving signal (TDS1) in the first unit touch period (UTS1).

As described above, according to the frequency variable method based on the interval length, since the pulse number N of each unit touch period UTS is the same, pulse generation for frequency variation is advantageous.

The multi-frequency driving method according to the present embodiments can be used to drive touch electrodes at different positions in the display panel 110 using touch driving signals of different frequencies.

For example, the first touch electrode in the first position in the display panel 110 can be driven by the first touch drive signal having the first frequency, and the second touch electrode in the second position in the display panel 110 The touch electrode may be driven by a second touch driving signal having a second frequency different from the first frequency.

13 is a diagram illustrating a case where the touch display apparatus 100 according to the present embodiment performs the multi-frequency driving by varying the frequency of the touch driving signal TDS for each touch period TS. FIG.

Frequency driving by varying the frequency of the touch driving signal TDS for each touch period TS while the touch driving signal TDS is applied to at least one of the plurality of touch electrodes TE, The load-free driving signal D_LFDS may be applied to all or a part of the data line DL.

The load-free driving signal D_LFDS applied to all or a part of the plurality of data lines DL may be a touch driving signal TDS or a signal corresponding to the frequency and phase of the touch driving signal TDS.

When the frequency of the touch driving signal TDS varies from F1 to F2 according to the multi-frequency driving, the frequency of the load-free driving signal D_LFDS applied to all or a part of the plurality of data lines DL also changes from F1 to F2 It can be different together.

Referring to FIG. 13, in the first unit touch period UTS1 according to the first frequency F1 of the touch driving signal TDS1 output from the first unit touch period UTS1, The frequency of the pre-driving signal D_LFDS1 is determined and the frequency of the pre-driving signal D_LFDS1 is determined in accordance with the second frequency F2 of the touch driving signal TDS2 output from the second unit touch period UTS2, The frequency of the load-free drive signal D_LFDS2 output to the drive signal line DL is determined.

Therefore, even when the multi-frequency driving proceeds, no potential difference is generated between the touch electrode TE to which the touch driving signal TDS is applied and the data line DL to which the load-free driving signal D_LFDS is applied, The parasitic capacitance Cp1 can be prevented from being formed between the touch electrode TEs and the data line DL to which the signal TDS is applied.

When the frequency of the touch driving signal TDS is varied for each touch period TS to perform multi-frequency driving, while the touch driving signal TDS is applied to at least one of the plurality of touch electrodes TE, The load-free driving signal G_LFDS can be applied to all or a part of the plurality of gate lines GL.

The load-free driving signal G_LFDS applied to all or a part of the plurality of gate lines GL may be a touch driving signal TDS or a signal corresponding to the frequency and phase of the touch driving signal TDS.

When the frequency of the touch driving signal TDS varies according to the multi-frequency driving, the frequency of the load-free driving signal G_LFDS applied to all or a part of the plurality of gate lines GL may also be varied.

Referring to FIG. 13, according to the first frequency F1 of the touch driving signal TDS1 output from the first unit touch period UTS1, a load The frequency of the free drive signal G_LFDS1 is determined and the frequency of the pre-drive signal G_LFDS1 is determined in accordance with the second frequency F2 of the touch drive signal TDS2 output from the second unit touch period UTS2. The frequency of the load-free drive signal G_LFDS2 output to the drive circuit GL may be determined.

Therefore, even when the multi-frequency driving proceeds, no potential difference is generated between the touch electrode TEs to which the touch driving signal TDS is applied and the gate line GL to which the load-free driving signal G_LFDS is applied, The parasitic capacitance Cp2 can be prevented from being formed between the touch electrode TEs to which the signal TDS is applied and the gate line GL.

When the frequency of the touch driving signal TDS is varied for each touch period TS to perform multi-frequency driving, while the touch driving signal TDS is applied to at least one of the plurality of touch electrodes TE, The load-free driving signal T_LFDS may be applied to all or part of the remaining touch electrodes TE.

The rod-free driving signal T_LFDS applied to all or a part of the remaining touch electrodes TE may be a touch driving signal TDS or a signal corresponding to the frequency and phase of the touch driving signal TDS.

When the frequency of the touch driving signal TDS varies according to the multi-frequency driving, the frequency of the load-free driving signal T_LFDS applied to all or a part of the remaining touch electrodes TE may also be varied.

Referring to FIG. 13, in the first unit touch period UTS1, the second touch signal TE is output to the other touch electrode TE according to the first frequency F1 of the touch driving signal TDS1 output from the first unit touch period UTS1 The frequency of the load-free driving signal T_LFDS1 is determined and the frequency of the other touch in the second unit touch period UTS2 is determined according to the second frequency F2 of the touch drive signal TDS2 output from the second unit touch period UTS2. The frequency of the load-free driving signal T_LFDS2 output to the electrode TE can be determined.

Therefore, even when the multi-frequency driving proceeds, a potential difference does not occur between the touch electrode TEs to which the touch driving signal TDS is applied and the other touch electrode TEo to which the rod-free driving signal T_LFDS is applied, The parasitic capacitance Cp3 can be prevented from being formed between the touch electrode TEs to which the driving signal TDS is applied and the other touch electrode TEo.

Next, referring to FIGS. 14 to 17, a multi-frequency driving method for a case where one touch interval TS corresponds to two or more unit touch intervals UTS will be described.

Hereinafter, a case where one touch interval TS corresponds to three unit touch intervals UTS1, UTS2 and UTS3 will be exemplified. The first frequency F1 of the touch drive signal TDS1 in the first unit touch period UTS1 and the second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2, And the third frequency F3 of the touch driving signal TDS3 in the third unit touch period UTS3 are all different.

Referring to FIG. 14, a first unit touch period UTS1 in which a touch drive signal TDS1 of a first frequency F1 is output in one touch period TS, There is a second unit touch section UTS2 for outputting the signal TDS2 and a second unit touch section UTS2 for outputting the touch drive signal TDS2 for the second frequency F2.

The first frequency F1 of the touch drive signal TDS1 in the first unit touch period UTS1 and the second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2, The third frequency F3 of the touch driving signal TDS3 in the unit touch period UTS3 is not all the same.

That is, the first frequency F1, the second frequency F2 and the third frequency F3 are all different, or two of the first frequency F1, the second frequency F2 and the third frequency F3 (F1 and F2, F1 and F3, or F2 and F3) are the same and one (F3, F2, or F1) may be different.

The first frequency F1 of the touch driving signal TDS1 in the first unit touch period UTS1 corresponds to the first period T1 of the first unit touch period UTS1 and the pulse number T1 of the first unit touch period UTS1 (N1). ≪ / RTI >

The second frequency F2 of the touch driving signal TDS2 in the second unit touch period UTS2 corresponds to the interval length T2 of the second unit touch period UTS2 and the pulse number T2 of the second unit touch period UTS2 (N2). ≪ / RTI >

The third frequency F3 of the touch drive signal TDS3 in the third unit touch period UTS3 corresponds to the third period T3 of the third unit touch period UTS3 and the third pulse period T3 of the third unit touch period UTS3, (N3). ≪ / RTI >

The number of pulses N of the touch driving signal TDS or the interval length T of each unit touch interval UTS is adjusted in each unit touch interval UTS so that the unit touch interval UTS The frequency F of the touch driving signal TDS can be efficiently varied.

The frequency F of the touch driving signal TDS can be varied by adjusting the number N of pulses of the touch driving signal TDS in each unit touch period UTS as shown in FIG.

According to the frequency variable method based on the number of pulses, the interval length T1 of the first unit touch period UTS1, the interval length T2 of the second unit touch interval UTS2, and the interval length T2 of the third unit touch interval UTS3 The section length T3 may be the same.

However, the number of pulses N1 of the touch drive signal TDS1 in the first unit touch period UTS1, the pulse number N2 of the touch drive signal TDS2 in the second unit touch period UTS2, The number of pulses N3 of the touch driving signal TDS3 in the unit touch period UTS3 are not all the same.

That is, N1, N2, and N3 are all different, or two of N1, N2, and N3 are the same and one may be different.

Referring to FIG. 15, during the second unit touch period UTS2 of the interval length T2 equal to the interval length T1 of the first unit touch interval UTS1, The second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 is output by outputting the touch drive signal TDS2 having the number of pulses N2 smaller than the pulse number N1 of the signal TDS1, Can be made lower than the first frequency F1 of the touch driving signal TDS1 in the first unit touch period UTS1.

The touch driving signal TDS1 in the first unit touch period UTS1 is set to the first unit touch period UTS3 during the third unit touch period UTS3 with the interval length T3 equal to the interval length T2 of the second unit touch interval UTS2, The touch driving signal TDS3 having the number of pulses N3 that is larger than the number of pulses N1 of the first unit touch period UTS2 and smaller than the pulse number N2 of the touch drive signal TDS2 in the second unit touch period UTS2 is output, May be set higher than the second frequency F2 of the touch driving signal TDS2 in the two-unit touch period UTS2 and lower than the first frequency F1 of the touch driving signal TDS1 in the first unit touch period UTS1 have.

As described above, according to the frequency variable method based on the number of pulses, since the interval lengths T of the unit touch periods UTS are the same, the frequency components are dispersed equally in terms of time, The EMI reduction effect due to dispersion can be further obtained.

16, the frequency F of the touch driving signal TDS can be varied by adjusting the section length T of each unit touch section UTS.

According to the frequency variable method based on the interval length, the number of pulses N1 of the touch driving signal TDS1 in the first unit touch period UTS1 and the number of pulses N1 of the touch driving signal TDS2 in the second unit touch period UTS2 And the number N3 of pulses of the touch driving signal TDS3 in the third unit touch period UTS3 may be the same.

The section length T1 of the first unit touch section UTS1, the section length T2 of the second unit touch section UTS2 and the section length T2 of the second unit touch section UTS2 are not the same .

That is, T1, T2, and T3 are all different, or two of T1, T2, and T3 are the same and one may be different.

Referring to FIG. 16, during the second unit touch period UTS2 of the segment length T2 longer than the segment length T1 of the first unit touch period UTS1, The second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 is output by outputting the touch drive signal TDS2 having the number of pulses N2 equal to the pulse number N1 of the signal TDS1, Can be made lower than the first frequency (F1) of the touch driving signal (TDS1) in the first unit touch period (UTS1).

During the third unit touch period UTS3 of the section length T3 which is shorter than the section length T1 of the second unit touch interval UTS2 and longer than the interval length T1 of the first unit touch interval UTS1, By outputting the touch driving signal TDS3 of the number of pulses N3 equal to the pulse number N2 of the touch driving signal TDS2 in the second unit touch period UTS2, The third frequency F3 of the signal TDS3 is higher than the second frequency F2 of the touch drive signal TDS2 in the second unit touch period UTS2 and the third frequency F3 of the touch drive signal TDS1 Of the first frequency F1.

As described above, according to the frequency variable method based on the interval length, since the pulse number N of each unit touch period UTS is the same, pulse generation for frequency variation is advantageous.

FIG. 17 is a diagram illustrating load-free driving when the touch display device 100 according to the present embodiment performs multi-frequency driving by varying the frequency of a touch driving signal TDS within a touch interval.

Frequency driving by varying the frequency of the touch driving signal TDS for each unit touch period UTS within the touch period TS, the touch driving signal TDS is applied to at least one of the plurality of touch electrodes TE The load-free driving signal D_LFDS may be applied to all or a part of the plurality of data lines DL while the TDS is applied.

The load-free driving signal D_LFDS applied to all or a part of the plurality of data lines DL is a touch driving signal TDS or a signal corresponding to the frequency and / or phase of the touch driving signal TDS . For example, the frequency and / or phase of the load-free drive signal D_LFDS may be the same as the frequency and / or phase of the touch drive signal TDS.

The frequency of the load-free driving signal D_LFDS applied to all or a part of the plurality of data lines DL is also F1, F2 and F3 when the frequency of the touch driving signal TDS is changed to F1, F2 and F3 according to the multi- F2 and F3, respectively.

Referring to FIG. 17, a first unit touch period UTS1 to a data line DL output from the first unit touch period UTS1 according to a first frequency F1 of a touch driving signal TDS1 output from the first unit touch period UTS1, The frequency of the pre-driving signal D_LFDS1 is determined and the frequency of the pre-driving signal D_LFDS1 is determined in accordance with the second frequency F2 of the touch driving signal TDS2 output from the second unit touch period UTS2, The frequency of the load-free driving signal D_LFDS2 outputted to the third unit touch period UDS3 is also determined and the frequency of the third unit touch period DDS2 is determined according to the third frequency F3 of the touch drive signal TDS3 outputted from the third unit touch period UTS3 The frequency of the load-free driving signal D_LFDS3 output from the UTS3 to the data line DL can be determined.

Therefore, even when the multi-frequency driving proceeds, no potential difference is generated between the touch electrode TE to which the touch driving signal TDS is applied and the data line DL to which the load-free driving signal D_LFDS is applied, The parasitic capacitance Cp1 can be prevented from being formed between the touch electrode TEs to which the signal TDS is applied and the data line DL to which the load-free driving signal D_LFDS is applied.

In addition, when multi-frequency driving is performed by varying the frequency of the touch driving signal TDS for each unit touch period UTS within the touch interval TS, at least one of the plurality of touch electrodes TE is touch- While the signal TDS is applied, the load-free driving signal G_LFDS may be applied to all or a part of the plurality of gate lines GL.

The load-free driving signal G_LFDS applied to all or a part of the plurality of gate lines GL may be a touch driving signal TDS or a signal corresponding to the frequency and / or phase of the touch driving signal TDS. For example, the frequency and / or phase of the load-free drive signal G_LFDS may be the same or substantially the same as the frequency and / or phase of the touch drive signal TDS.

When the frequency of the touch driving signal TDS varies according to the multi-frequency driving, the frequency of the load-free driving signal G_LFDS applied to all or a part of the plurality of gate lines GL may also be varied.

Referring to FIG. 17, there is shown a block diagram of a touch sensing apparatus according to the present invention, in which a first unit touch period (UTS1) to a first touch period (UTS1) The frequency of the free drive signal G_LFDS1 is determined and the frequency of the pre-drive signal G_LFDS1 is determined in accordance with the second frequency F2 of the touch drive signal TDS2 output from the second unit touch period UTS2. The frequency of the load-free driving signal G_LFDS2 outputted to the third unit touch period GL is determined and the third unit touch period GDSF2 is determined according to the third frequency F3 of the touch drive signal TDS3 output from the third unit touch period UTS3 The frequency of the load-free driving signal G_LFDS3 output from the UTS3 to the gate line GL can be determined.

Therefore, even when the multi-frequency driving proceeds, no potential difference is generated between the touch electrode TEs to which the touch driving signal TDS is applied and the gate line GL to which the load-free driving signal G_LFDS is applied, The parasitic capacitance Cp2 can be prevented from being formed between the touch electrode TEs to which the signal TDS is applied and the gate line GL to which the load-free driving signal G_LFDS is applied.

In addition, when multi-frequency driving is performed by varying the frequency of the touch driving signal TDS for each unit touch period UTS within the touch interval TS, at least one of the plurality of touch electrodes TE is touch- While the signal TDS is applied, the load-free driving signal T_LFDS may be applied to all or a part of the remaining touch electrodes TE.

The rod-free driving signal T_LFDS applied to all or a part of the remaining touch electrodes TE may be a touch driving signal TDS or a signal corresponding to the frequency and / or phase of the touch driving signal TDS. For example, the frequency and / or phase of the load-free drive signal T_LFDS may be equal to the frequency and / or phase of the touch drive signal TDS.

When the frequency of the touch driving signal TDS varies according to the multi-frequency driving, the frequency of the load-free driving signal T_LFDS applied to all or a part of the remaining touch electrodes TE may also be varied.

Referring to FIG. 17, in a first unit touch period UTS1, a first touch F1 is output to another touch electrode TE according to a first frequency F1 of a touch driving signal TDS1 output from the first unit touch period UTS1 The frequency of the load-free driving signal T_LFDS1 is determined and the frequency of the other touch in the second unit touch period UTS2 is determined according to the second frequency F2 of the touch drive signal TDS2 output from the second unit touch period UTS2. The frequency of the load-free driving signal T_LFDS2 output to the electrode TE is determined and the third unit touch TDS3 according to the third frequency F3 of the touch driving signal TDS3 output from the third unit touch period UTS3. The frequency of the load-free driving signal T_LFDS3 output to the other touch electrode TE in the section UTS3 can be determined.

Therefore, even when the multi-frequency driving proceeds, a potential difference does not occur between the touch electrode TEs to which the touch driving signal TDS is applied and the other touch electrode TEo to which the rod-free driving signal T_LFDS is applied, The parasitic capacitance Cp3 can be prevented from being formed between the touch electrode TEs to which the driving signal TDS is applied and the other touch electrode TEo to which the load free driving signal T_LFDS is applied.

As described above, the display section DS for the display mode and the touch section TS for the touch mode may be separated in time.

There may be two or more unit touch periods UTS for outputting the touch drive signal TDS of the same frequency.

Two or more unit touch intervals UTS may exist in one touch interval TS or may exist separately in each other touch interval TS.

That is, two or more unit touch intervals (UTS) may be included in one touch interval (TS). Alternatively, each unit touch interval (UTS) may correspond to one touch interval (TS).

For example, as shown in FIG. 10, the first unit touch period UTS1 and the second unit touch period UTS2 may exist separately in different touch periods TS1 and TS2. That is, the first unit touch period UTS1 may correspond to the first touch period TS1, and the second unit touch period UTS2 may correspond to the second touch period TS2.

As shown in FIG. 14, the first unit touch period UTS1 and the second unit touch period UTS2 may coexist in one touch period TS.

The frequency of the touch driving signal TDS can be varied by changing the allocation method of the unit touch period UTS which is a section for driving the touch electrode TE using the single frequency touch driving signal TDS, And the length of the interval in which the frequency of the touch driving signal TDS is kept equal to the interval length of the unit touch interval (UTS). In this way, effective multi-frequency driving can be provided in consideration of the performance of the configuration for performing the frequency variable or the touch sensing performance.

The multi-frequency driving through frequency variation of each touch interval described with reference to FIGS. 10 to 13 can be applied to both the V-sensing method of FIG. 3 and the H-sensing method of FIG.

The multi-frequency driving through the frequency variation in the touch interval described with reference to FIGS. 14 to 17 can be applied to both the V-sensing method of FIG. 3 and the H-sensing method of FIG.

FIG. 18 is a diagram illustrating a case where the touch display apparatus 100 according to the embodiments performs multi-frequency driving (FIGS. 10 to 13) through frequency variation of each touch interval under the V-sensing method, The touch display device 100 according to the present embodiments performs multi-frequency driving (Fig. 14 to Fig. 17) through frequency variation in the touch section under the V-sensing method.

Referring to FIGS. 18 and 19, when touch driving and sensing are performed in a V-sensing manner, one display period (DS) may exist in one display frame period and one or two touch intervals (TS) Can exist.

The V-sensing method is also referred to as V-blank operation because the touch driving is performed in a section where the display is not driven.

As shown in FIG. 18, when one touch interval exists in one display frame period, that is, when the touch sensing circuit 120 performs touch driving and sensing of the V-sensing scheme, When multi-frequency driving is performed by varying the frequency, two or more unit touch periods UTS1 and UTS2 may exist separately in different touch periods TS1 and TS2.

As shown in FIG. 19, when one touch interval exists in one display frame period, that is, when the touch sensing circuit 120 performs touch driving and sensing of the V-sensing scheme, Frequency driving, the two or more unit touch periods UTS1, UTS2 and UTS3 may exist in one touch period TS.

In other words, if one touch period (TS) included in one display frame period is divided into three unit touch periods (UTS1, UTS2, UTS3), the touch driving signal (TDS1) of the first frequency A second unit touch section UTS2 for performing touch driving using a first unit touch section UTS1 using a touch drive signal TDS2 using a second frequency F12 and a third unit touch section UTS2 using a touch drive signal TDS2 for a second frequency F12, The third unit touch period UTS3 in which the touch driving is performed using the touch driving signal TDS3 of the frequency F3 may coexist in one touch period TS.

Through the above-described multi-frequency driving, the touch display device 100 according to the present embodiments performs touch driving and sensing in a V-sensing manner in consideration of display performance, touch performance, and the like, .

FIGS. 20 and 21 are views showing a case where the touch display device 100 according to the present embodiments performs multi-frequency driving under the H-sensing scheme.

Referring to FIG. 20, when the touch display device 100 according to the present embodiment performs touch driving and sensing in the H-sensing manner, more than one display period and more than one touch period may exist in one display frame period have.

At this time, when the frequency of the touch driving signal TDS is varied for each touch period TS, two or more unit touch periods UTS1 and UTS2 may exist separately in two or more touch periods TS1 and TS2.

Through the above-described multi-frequency driving, the touch display device 100 according to the present embodiments performs touch driving and sensing in an H-sensing manner in consideration of display performance, touch performance, and the like, .

Referring to FIG. 21, when the touch display device 100 according to the present exemplary embodiment performs touch driving and sensing in the H-sensing manner, more than one display period and more than one touch period may exist in one display frame period have.

At this time, when the frequency of the touch driving signal TDS is varied within each touch period TS1, two or more unit touch periods UTS1, UTS2, and UTS3 may exist in each touch period TS1.

Through the above-described multi-frequency driving, the touch display device 100 according to the present embodiments performs touch driving and sensing in an H-sensing manner in consideration of display performance and touch performance, So that the EMI can be further reduced.

Referring to FIGS. 19 and 21, when two or more unit touch intervals UTS1, UTS2 and UTS3 coexist in one touch interval, the sum of the lengths of two or more unit touch intervals UTS1, UTS2 and UTS3 T1 + T2 + T3) may be less than or equal to the section length of one touch interval (TS).

According to the above description, the touch display device 100 can efficiently provide multi-frequency driving for EMI improvement while satisfying a desired overall display and touch performance condition.

The frequency varying method of the touch driving signal TDS for multi-frequency driving may be as follows.

The frequency of the touch driving signal TDS can be varied while sequentially selecting the usable frequency included in the predetermined usable frequency list.

In order to further increase the variability of the frequency, a usable frequency included in a predetermined usable frequency list is selected in a predetermined order, and the selection order is changed according to a certain rule, The frequency may be variable.

In order to further increase the variability of the frequency, the usable frequency included in the predetermined usable frequency list is randomly selected according to the shuffling process (the process of randomly selecting frequencies) ) May be varied. That is, the frequency of the touch driving signal TDS may be varied according to the shuffling process of the usable frequency list.

As another example of the method of varying the frequency of the touch driving signal TDS in order to further increase the variability of the frequency, the frequency of the touch driving signal TDS may be determined completely randomly without the predetermined usable frequency list. The frequency may be variable. That is, the frequency of the touch driving signal TDS can be varied at random.

At this time, the frequency variation range (minimum value to maximum value) may be determined, and an algorithm for generating random information such as a hash function may be used to determine the random frequency.

According to various frequency variable methods for increasing the frequency variation as described above, the EMI phenomenon can be further reduced or eliminated.

Meanwhile, another embodiment of the touch driving signal TDS applied to the same touch electrode TE will be described as follows.

A touch drive signal TDS having a first drive frequency is applied to the first touch electrode TE or the first touch electrode group (including two or more touch electrodes) during the first unit touch period of the first frame, A touch driving signal TDS having a first driving frequency may be applied to the first touch electrode or the first touch electrode group during the first unit touch period of the second frame. The advantages are as follows. That is, since the touch driving signal having the same characteristic (including frequency) is driven while the touch electrode or the touch electrode group formed at the same position is sensed, no change of the touch driving signal according to the position of the touch electrode is given, So that the touch row data can be consistently maintained.

At this time, while the touch driving signal TDS having the first driving frequency is applied to the first touch electrode TE or the first touch electrode group, the other touch electrodes or the other touch electrode groups are connected to the load The pre-driving signal T_LFDS can be applied.

In another embodiment, the touch driving signal TDS having the first driving frequency is applied to the first touch electrode TE or the first touch electrode group (including two or more touch electrodes) during the first unit touch period of the first frame, A touch driving signal TDS having a second driving frequency different from the first driving frequency may be applied to the first touch electrode or the first touch electrode group during the first unit touch period of the second frame have.

At this time, while the touch driving signal TDS having the first driving frequency is applied to the first touch electrode TE or the first touch electrode group, the other touch electrodes or the other touch electrode groups are connected to the load The pre-driving signal T_LFDS may be applied to the first touch electrode TE or the first touch electrode group TE while the touch driving signal TDS having the second driving frequency is applied to the first touch electrode TE or the first touch electrode group, The group can be supplied with the load-free drive signal T_LFDS having the second drive frequency. The advantages of this drive are as follows. That is, while sensing the touch electrode or the touch electrode group formed at the same position, it is driven by the touch driving signals having different characteristics (including frequency) according to time, Influence of the specific noise due to the influence or the influence of the noise can be minimized or eliminated, thereby securing the reliability of the sensed touch row data.

Hereinafter, a method of touch sensing by performing touch driving according to the above-described multi-frequency driving will be briefly described again.

22 is a flowchart of a touch sensing method of the touch display device 100 according to the present embodiments.

The touch display device 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL arranged therein and a plurality of data lines DL and a plurality of gate lines GL Includes a display panel 110 in which a plurality of defined sub-pixels SP are arranged, and has two operation modes including a display mode for image display and a touch mode for touch sensing.

The touch sensing method of the touch display device 100 is a method of sensing at least one of a plurality of touch electrodes TE built in the display panel 110 sequentially in one touch interval or two or more touch intervals in one display frame interval A touch sensing step (S2210) of outputting a pulse type touch driving signal (TDS) for driving a plurality of touch electrodes (TE), a touch sensing step (S2210) S2220) and the like.

The above-described touch driving step S2210 may be a touch driving step based on multi-frequency driving with the frequency of the output touch driving signal TDS being two or more.

That is, the frequency of the touch driving signal TDS output in the above-described touch driving step S2210 may be varied.

According to the above-described touch sensing method, as the frequency of the touch driving signal TDS output from the touch sensing circuit 120 varies according to the multi-frequency driving, an EMI dispersion phenomenon occurs and EMI The phenomenon can be mitigated.

Hereinafter, the touch sensing circuit 120 for performing touch driving according to the above-described multi-frequency driving and sensing the touch will be described in more detail.

23 and 24 are views showing the touch sensing circuit 120 of the touch display device 100 according to the present embodiments.

Referring to FIGS. 23 and 24, the touch display device 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL, Includes a display panel 110 in which a plurality of subpixels SP defined by a plurality of gate lines GL are arranged and includes two display modes including a display mode for image display and a touch mode for touch sensing .

23 and 24, the touch sensing circuit 120 of the touch display device 100 may include a driving unit 2310, a sensing unit 2320, and the like.

The driving unit 2310 may output a pulse type touch driving signal TDS for sequentially driving at least one of the plurality of touch electrodes TE built in the display panel 110. [

The driving unit 2310 may perform touch driving through multi-frequency driving.

Accordingly, the frequency of the touch driving signal TDS output from the driving unit 2310 may be two or more.

That is, the frequency of the touch driving signal TDS output from the driving unit 2310 can be varied.

The sensing unit 2320 may sense a capacitance change in each of the plurality of touch electrodes TE and sense a touch position or a touch position.

The touch sensing circuit 120 may vary the frequency of the touch driving signal TDS in accordance with the multi-frequency driving, thereby causing an EMI dispersion phenomenon to reduce the EMI phenomenon caused by the touch driving signal TDS.

Referring to FIG. 23, the touch sensing circuit 120 may further include a signal generator 2330 for generating a touch driving signal TDS having two or more frequencies.

As described above, the frequency of the touch driving signal TDS can be generated by only one signal generating unit 2330 to perform multi-frequency driving, thereby reducing the number of signal generating configurations.

24, the touch sensing circuit 120 includes: a signal generator 2330 that generates a touch driving signal TDS having one frequency of two or more frequencies; And a signal converting unit 2400 for converting the driving signal TDS into a touch driving signal TDS having a different frequency.

The signal converter 2400 may be a frequency converter.

As described above, the signal generating unit 2330 generates the touch driving signal TDS having one frequency (reference frequency), and the signal converting unit 2400 converts the touch driving signal TDS having the different frequency Frequency driving can be performed. However, if only the signal converting unit 2400 is added, the existing signal generating unit 2330 using only a single frequency may be used as it is. There are advantages to be able to.

The signal generator 2330, the driver 2310, and the sensing unit 2320 may be implemented as separate integrated circuits or separate components.

In this case, the signal generator 2330 may be implemented as a power integrated circuit.

The driving unit 2310 may be implemented as a read-out integrated circuit (IC) including a multiplexer, an integrator, an analog-to-digital converter, And outputs the touch driving signal TDS to the touch electrode TE during the touch interval.

The driving unit 2310 may be implemented as an integrated integrated circuit including a functional unit of a read-out integrated circuit (IC) and a data driver (not shown) for driving the data line DL.

The sensing unit 2320 may be implemented as a micro control unit (MCU).

At least two of the signal generator 2330, the driver 2310, and the sensing unit 2320 may be included in one integrated circuit.

As an example, the signal generator 2330 and the driver 2310 may be included in one integrated circuit or one component.

As another example, both the signal generating unit 2330, the driving unit 2310, and the sensing unit 2320 may be implemented by being included in one integrated circuit or one component.

As described above, by implementing the touch sensing circuit 120 in various numbers of integrated circuits or components, it is possible to implement a touch sensing circuit 120 suitable for a middle- or large-sized display device, a small display device, or a mobile device.

FIG. 25 is a view showing an effect of EMI improvement of the touch display device 100 according to the present embodiments.

Referring to FIG. 25, when the touch display device 100 drives the touch electrode TE using a touch driving signal TDS having a single frequency of 100 KHz, Modulation Frequency range (eg, approximately 500 KHz to approximately 1,605 KHz) is removed by multi-frequency operation.

25 is a graph showing the measured upper limit value 2510 and the measured average value 2520 of the EMI signal for each frequency by measuring the signal intensity of the EMI signal for each frequency.

As a result of the measurement, it can be seen that the point (712 in FIG. 7, corresponding to EMI) where the upper measurement limit value 2510 of the EMI signal appears larger than the upper limit value 711, which is the upper limit value for satisfying the EMI condition, in the AM frequency domain is eliminated.

As a result of the measurement, it is confirmed that the point at which the measured average value 2520 of the EMI signal is larger than the reference average value 721, which is an average value for satisfying the EMI condition, in the AM frequency region (corresponding to EMI 722 in FIG. 7) have.

That is, through the multi-frequency driving, the measurement upper limit value 2510 and the measurement average value 2520 of the EMI signal in the AM frequency region can satisfy the EMI condition.

According to the embodiments described above, it is possible to provide a touch sensing method, a touch sensing circuit 120, and a touch display device 100 that can improve EMI (Electro Magnetic Interference) level.

This can prevent system stability due to EMI, display performance, and deterioration of touch sensing performance.

Hereinafter, more specific examples from the viewpoint of the H-sensing method for the multi-frequency driving as described above will be described with reference to Figs. 26 to 46. Fig.

Prior to the explanation, the driving environment described above will be briefly summarized.

As described above, when the display section for the display mode and the touch section for the touch mode are separated in time, that is, when the time division driving is performed, two or more units using the touch driving signals TDS of different frequencies The touch interval may be included in one touch interval or may correspond to one touch interval.

In the time division driving, one display period and one touch interval may exist in one display frame period, and two or more display periods and two or more touch intervals may exist.

When there is one display section and one touch section, the display panel 110 is driven in a V-sensing manner. When two or more display sections and two or more touch sections exist, the display panel 110 ).

In the case of driving in the V-sensing mode, two or more unit touch intervals using the touch driving signals TDS of different frequencies may be included in one touch interval.

In the case of driving in the H-sensing manner, two or more unit touch periods using the touch driving signals TDS of different frequencies may be included in one touch interval.

In the case of driving in the H-sensing manner, each of two or more unit touch segments using a touch drive signal TDS of different frequencies may correspond to one touch segment. That is, one unit touch section may be the same concept as one touch section.

26 is a driving example when the touch display device 100 according to the present embodiments is driven in the H-sensing manner.

26 is a diagram illustrating a waveform of a synchronization signal SYNC defining a display period and a touch period during one display frame period.

Referring to FIG. 26, when the touch display device 100 according to the present embodiments is driven in the H-sensing manner, the display driving and the touch driving can be alternately performed during one display frame period.

26, one display frame section includes 12 display sections DS1, DS2, ..., DS12 and 12 touch sections TS1, TS2, ..., TS12 .

That is, one display frame section includes a display section DS1, a touch section TS1, a display section DS2, a touch section TS2, ... ... A display section DS12, and a touch section TS12 in this order.

Referring to FIG. 26, when all of the 12 display periods DS1, DS2, ..., and DS12 have progressed during one display frame period, an image is displayed in the entire screen area.

Referring to FIG. 26, if all of the 12 touch intervals (TS1, TS2, ..., TS12) are progressed during one display frame period, the touch sensing result for the entire screen area is displayed once, twice, three times Can be obtained.

That is, one display frame section includes one or two or more touch frame sections.

In the example of FIG. 26, the display section and the touch section alternate, and a section including one display section and one touch section is referred to as an LHB section.

That is, the sum of DS1 and TS1 is referred to as LHB1, the sum of DS2 and TS2 is referred to as LHB2, and the sum of DS3 and TS3 is referred to as LHB3.

In this manner, the touch display device 100 according to the present embodiment is provided with 12 display periods DS1, DS2, ..., DS12 and 12 touch intervals TS1, TS2, ..., TS12 ), One display frame section includes 12 LHB sections (LHB1, LHB2, ..., LHB12). This driving is also referred to as 12 LHB driving.

When the touch display device 100 according to the present embodiment performs multi-frequency driving in the H-sensing manner, the touch driving device 100 performs driving for touch sensing (touch driving) by using a touch driving signal TDS having various frequencies, ) May be applied within one touch interval or within one display frame interval.

FIG. 27 is an exemplary diagram illustrating a case where the touch display apparatus 100 according to the present embodiment performs multi-frequency driving in one touch period when the touch display apparatus 100 performs multi-frequency driving in the H-sensing manner, Frequency driving in a single display frame period, and applying multi-frequency driving in one display frame period.

27, when the touch display device 100 according to the present exemplary embodiment performs multi-frequency driving in the H-sensing manner, one touch period between the display period DS1 and the display period DS2 (TDS) used in one touch period TS1 is divided into three frequencies (α [KHz], β [KHz], and γ [KHz]) by applying multi- .

When the touch display apparatus 100 according to the present embodiment performs multi-frequency driving in the H-sensing manner, when multi-frequency driving is applied within one touch period TS1, Has three unit touch periods (UTS). Here, the three unit touch periods UTS are divided into a unit touch period in which the touch sensing circuit 120 outputs the touch driving signal TDS of the frequency? [KHz] and a unit touch period in which the touch sensing circuit 120 outputs the frequency? And a unit touch section in which the touch sensing circuit 120 outputs a touch drive signal TDS of frequency? [KHz].

27 illustrates a case where the touch driving signal TDS used in one touch period TS1 has three frequencies a, b, and gamma. However, in the touch period TS1 used in the touch period TS1, The driving signal TDS may have two frequencies or four or more frequencies.

As described with reference to the example of FIG. 27, when multi-frequency driving is applied within one touch interval, two or more display intervals DS1, DS2, ... and two or more touch intervals TS1 , The number of frequencies of the touch driving signal TDS output during one display frame period may be equal to or less than the number of touch periods within one display frame period, It may happen that the number is exceeded.

As described above, by increasing the frequency of the frequency of the touch driving signal TDS, the touch driving can be somewhat complicated, but the EMI effect can be further reduced.

28, a single-frequency driving using a touch driving signal TDS having a single frequency in one touch interval is applied, and a single-frequency driving using a touch driving signal TDS Multi-frequency driving may be applied so that the frequency of the signal TDS is two or more.

In this case, it is assumed that multi-frequency driving is applied within one display frame period.

According to the example of FIG. 28, the frequency of the touch driving signal TDS is one (? [KHz]) in one touch period TS1 between the display period DS1 and the display period DS2. That is, single-frequency driving is performed in one touch period TS1.

However, in the other touch periods (at least one of TS2, TS3, ..., TS12), the touch driving signal TDS having a frequency different from the frequency ([KHz]) of the touch driving signal TDS used in the touch period TS1 is used .

(Single-frequency driving) by using a touch driving signal TDS having a single frequency in each touch interval, as described with reference to FIG. 28, a plurality of touch intervals TS1, TS2, ... (Multi-frequency driving) is performed using a touch driving signal TDS having two or more frequencies in one display frame section, that is, when a multi-frequency driving is applied within a display frame section The number of frequencies (the number of frequency types) of the touch driving signal TDS used in one display frame section may be equal to or less than the number of touch intervals.

That is, when there are two or more display periods DS1, DS2, ... and two or more touch periods TS1, TS2, ... in one display frame period, the output from the touch sensing circuit 120 during one display frame period The number of frequency of the touch driving signal TDS may be equal to or less than the number of touch periods in one display frame section.

According to this, there is an advantage that the touch drive can be efficiently performed while the influence of the EMI is reduced.

29 to 31 illustrate a case where the touch display device 100 according to the present embodiment is driven in the H-sensing manner and applies multi-frequency driving within one display frame period, Fig. 3 is a diagram showing three examples of the frequency pattern of the touch driving signal TDS.

As shown in FIG. 26, 12 LHB driving is performed in which 12 display periods (DS1, DS2, ..., DS12) and 12 touch periods (TS1, TS2, ..., TS12) alternate during one display frame period, The frequency pattern of the touch driving signal TDS used in the 12 touch periods (TS1, TS2, ..., TS12) may be changed by one cycle of the display frame period, 1 / M (M is a natural number of 2 or more) of the display frame section can be changed by one period.

In other words, as shown in FIG. 29, the frequency pattern of the touch driving signal TDS can be changed by setting one display frame period as one period (a period indicated by the regularity of frequency change).

29, the frequency of the touch driving signal TDS used in the 12 touch periods TS1, TS2, ..., TS12 in one display frame interval is a, b, c, d, e, f, g, h, i, j, k,

The frequencies of the touch driving signals TDS used in the 12 touch periods TS1, TS2, ... TS12 in the next display frame period are a, b, c, d, e, f, g, , i, j, k, l.

The frequencies of the touch driving signals TDS used in the 12 touch periods TS1, TS2, ..., TS12 are a, b, c, d, e, f, g, h, i, j, k, l.

29, the frequencies a, b, c, d, e, f, g, h, i, j, k, l of the touch driving signal TDS may all be different values. In this case, the number of frequency types of the touch driving signal TDS used in the 12 touch periods (TS1, TS2, ..., TS12) included in one display frame section is 12.

Alternatively, the frequencies a, b, c, d, e, f, g, h, i, j, k and l of the touch driving signal TDS may not be different. In this case, the number of frequency types of the touch driving signal TDS used in the 12 touch periods (TS1, TS2, ..., TS12) included in one display frame section may be smaller than twelve.

As shown in FIGS. 30 and 31, the frequency pattern of the touch driving signal TDS may change in a period of 1 / M (M: 2 or more natural number) of one display frame period.

In the case of FIG. 30, the frequency pattern of the touch driving signal TDS may change in a cycle of one half (M = 2) of one display frame period.

That is, among the 12 touch intervals (TS1, TS2, ..., TS12) included in one display frame interval, the touch drive signal TDS used for each of six touch intervals corresponding to 1/2 of the display frame interval The frequencies a, b, c, d, e, and f are regularly repeated.

The frequencies of the touch driving signals TDS used in the six preceding touch periods TS1, ..., TS6 among the twelve touch periods TS1, TS2, ..., TS12 included in one display frame period are a, b, c, d, e, f, and the frequency of the touch driving signal TDS used in the six touch intervals (TS7, ..., T12) to be.

 30, among sixteen touch intervals (TS1, TS2, ..., TS12) included in one display frame period, six touch intervals (TS1, ..., TS6) The six touch intervals (TS7, ..., TS12) located next are referred to as group 2, and each group repeatedly uses the same frequencies.

In the case of FIG. 31, the frequency pattern of the touch driving signal TDS may be changed by one cycle of 1/3 (M = 3) of one display frame period.

That is, among the 12 touch periods (TS1, TS2, ..., TS12) included in one display frame period, the touch driving signal TDS used for every four touch periods corresponding to 1/3 of the display frame period The frequencies a, b, c and d are repeated regularly.

The frequencies of the touch driving signals TDS used in the four preceding touch periods TS1 to TS4 among the twelve touch periods TS1, TS2, ..., TS12 included in one display frame period are a, b, c, and d, and the frequencies of the touch driving signals TDS used in the four touch intervals TS5, ..., TS8 positioned next thereto are also a, b, c, and d. The frequencies of the touch driving signals TDS used in the last four touch intervals TS9, ..., TS12 are also a, b, c, and d.

Referring to FIG. 31, among the 12 touch intervals (TS1, TS2, ..., TS12) included in one display frame interval, four touch intervals (TS1, ..., TS4) The four touch intervals (TS5, ..., TS8) located next are called a group 2, and the four touch intervals (TS9, ..., TS12) positioned at the end are group 3, and each group repeatedly uses the same frequencies do.

32 and 33, when the touch display device 100 according to the present embodiment is driven in the H-sensing manner and multi-frequency driving is applied within one display frame interval, the display interval and the touch interval are assigned .

32 and 33 are diagrams for explaining a case where m (m is a natural number equal to or greater than 1) LHB section (LHBm) among a plurality of LHB sections (for example, LHB1, LHB2, ..., LHB12 in FIG. 26) (n is a natural number greater than or equal to 2 and is a natural number greater than m) th LHB section LHBn.

32 and 33, an mth LHB section LHBm includes an mth display section DSm and an mth touch section TSm, and an nth LHB section LHBn includes an nth display section DSn ) And an n-th touch period (TSn).

32 and 33, two or more display intervals DSm and DSn included in one display frame interval include an m-th display interval DSm and an n-th display interval DSn, Two or more touch intervals TSm and TSn included in the interval may include an m-th touch interval TSm and an n-th touch interval TSn.

the mth touch interval TSm may be performed after the mth display interval DSm and the nth touch interval TSn may be performed after the nth display interval DSn.

Referring to FIG. 32, the lengths Tdsm and Tdsn of two or more display periods DSm and DSn may be equal to each other. In addition, the segment lengths (Ttsm, Ttsn) of the two or more touch segments (TSm, TSn) may be equal to each other.

That is, the interval length Tdsm of the m-th display interval DSm and the interval length Tdsn of the n-th display interval DSn may be the same. the section length Ttsm of the mth touch section TSm and the section length Ttsn of the nth touch section TSn may be the same.

Referring to FIG. 32, LHB section lengths may be equal to each other. That is, the sum (Tdsm + Ttsm) of the section length Tdsm of the mth display section DSm and the section length Ttsm of the mth touch section TSm is the sum of the section length Tdsn of the nth display section DSn (Tdsn + Ttsn) of the n-th touch period TSn and the section length Ttsn of the n-th touch period TSn.

Referring to FIG. 33, the segment lengths Tdsm and Tdsn of two or more display segments DSm and DSn may be different from each other. In addition, the segment lengths (Ttsm, Ttsn) of the two or more touch segments (TSm, TSn) may be different from each other.

That is, the interval length Tdsm of the m-th display interval DSm may be different from the interval length Tdsn of the n-th display interval DSn. the section length Ttsm of the mth touch section TSm and the section length Ttsn of the nth touch section TSn may be different.

33, even if the segment lengths Tdsm and Tdsn of two or more display segments DSm and DSn are different from each other and the segment lengths Ttsm and Ttsn of two or more touch segments TSm and TSn are different from each other, The section lengths may be equal to each other.

That is, the sum (Tdsm + Ttsm) of the section length Tdsm of the mth display section DSm and the section length Ttsm of the mth touch section TSm is the sum of the section length Tdsn of the nth display section DSn (Tdsn + Ttsn) of the n-th touch period TSn and the section length Ttsn of the n-th touch period TSn.

The above-mentioned section allocation and section length characteristics are summarized as follows.

When two or more display periods DSm, DSn, ... and two or more touch periods TSm, TSn, ... exist in one display frame period, two or more display periods DSm, DSn, ..., , ...) may be equal to each other.

33, when two or more display periods DSm, DSn, ... and two or more touch periods TSm, TSn, ... exist in one display frame period, two or more display periods DSm, DSn The interval length Tdsm of at least one of the display periods DSm may be different from the interval length Tdsn of the other display interval DSn.

32, when two or more display intervals DSm, DSn, ... and two or more touch intervals TSm, TSn, ... exist in one display frame interval, two or more touch intervals TSm, TSn, , ...) may be equal to each other.

When two or more display intervals DSm, DSn, ... and two or more touch intervals TSm, TSn, ... exist in one display frame period, two or more touch intervals TSm, TSn, , ...) may be different from the section length (Ttsn) of the other touch section (TSn).

FIG. 34 is a diagram for explaining the case where the touch display device 100 according to the present embodiments is driven in the H-sensing manner and multi-frequency driving is applied within one display frame period. FIG. 35 is a view illustrating an example of a signal waveform applied to the touch electrode TE in the touch section TE1 of FIG. 35. FIG. 35 is a diagram illustrating an example in which the touch display device 100 according to the present embodiment is driven by the H- FIG. 6 is an exemplary diagram illustrating a signal waveform applied to the touch electrode TE in the touch period TS1 that is multi-frequency driven when multi-frequency driving is applied. FIG.

Referring to FIG. 34, when performing a single-frequency driving in one touch period TS1 and applying multi-frequency driving in one display frame period, during a touch period TS1, a touch driving signal having a predetermined frequency (TDS) is applied to at least one touch electrode TE.

During the touch period TS1, one or more pre-dummy pulses PRE and one or more setting pulses SET may be applied before the touch driving signal TDS is applied.

A common voltage corresponding to the DC voltage is applied to the touch electrode TE during the display period DS1 and a touch driving signal TDS of the pulse signal type is applied during the touch period TS1. Here, the high level voltage of the touch signal TDS of the pulse signal type is higher than the common voltage.

Therefore, at the start of the touch period TS1 after the display period DS1, the touch electrode TE is driven at a rapid timing because of the common voltage applied during the display period DS1, and the voltage corresponding to the touch driving signal TDS It may not become a state.

Accordingly, in the touch period TS1, an accurate sensing value may not be obtained due to the influence of the preceding display period DS1.

In order to solve this problem, in order to stabilize the touch sensing, one or more pre-dummy pulses PRE may be applied before the touch driving signal TDS is applied in the touch period TS1.

At least one pre-dummy pulse PRE may be applied to at least one touch electrode TE at a start point of the touch period TS1 and may be applied to at least one touch electrode TE1 immediately before the touch period TS1, (TE).

Also, before the touch driving signal TDS is applied in the touch period TS1, one or more setting pulses SET may be applied to at least one touch electrode TE.

Here, one or more setting pulses (SET) may serve to inform the frequency of the following touch driving signal (TDS).

Therefore, the pulses of the touch driving signal TDS at one or more setting pulses SET have the same frequency a [KHz].

The one or more pre-dummy pulses PRE may have the same frequency as the pulses of the at least one setting pulse SET and the touch driving signal TDS, and may have different frequencies.

In Fig. 35, when multi-frequency driving is applied in one touch period TS1, a touch driving signal (a1, a2) having two frequencies a1 and a2 during one touch period TS1 to be multi- TDS) is applied to at least one touch electrode TE.

That is, during one touch period TS1, the touch driving signal TDS having the frequency a1 is applied to at least one touch electrode TE, and then the touch driving signal TDS having the frequency a2 is applied to at least one And is applied to the corresponding touch electrode TE.

Before the touch driving signal TDS having the frequency a1 is applied during the touch period TS1 so that the subsequent touch period TS1 is not influenced by the display period DS1 when the display period DS1 ends, At least one pre-dummy pulse PRE may be applied to at least one touch electrode TE.

The at least one pre-dummy pulse PRE may be applied to at least one touch electrode TE at the start point of the touch period TS1 and may be applied to at least one touch electrode TE .

Also, during the touch period TS1, at least one setting pulse SET may be applied to at least one touch electrode TE before the touch driving signal TDS having the frequency a1 is applied.

Here, one or more setting pulses (SET) can serve to notify the frequency a1 of the following touch driving signal TDS.

After the touch driving signal TDS having the frequency a1 is applied during the touch period TS1, at least one setting pulse SET is applied to at least one corresponding touch electrode TE, The touch driving signal TDS may be applied to at least one corresponding touch electrode TE.

Here, one or more setting pulses (SET) applied to the touch electrode TE prior to the touch driving signal TDS having the frequency a2 serve to inform the frequency a2 of the following touch driving signal TDS can do.

Referring to FIG. 35, frequencies a1 and a2 may be the same frequency or different frequencies.

Even if the frequencies a1 and a2 are the same frequency, the touch-driving signal TDS having the frequency a1 and the setting-pulse SET existing between the touch-driving signal TDS having the frequency a2 and the touch- The touch driving signal TDS having the frequency a2 and the touch driving signal TDS having the frequency a2 can be distinguished from each other.

36A is a diagram illustrating a case where the touch display device 100 according to the present embodiment is driven in the H-sensing manner and multi-frequency driving is applied within one display frame period. In the touch period in which the single- Fig. 5 is a diagram showing an application period and a rest period (non-pulse application period). Fig.

The period during which the pulses corresponding to the touch driving signal TDS are actually output from the sensing circuit 120 during one touch interval may correspond to the interval length of the touch interval. However, as shown in FIG. 36A, It may be much shorter than the section length.

During the touch period, the periods during which the pulses corresponding to the touch driving signal TDS are not actually output from the touch sensing circuit 120 are referred to as rest periods (Tp1-1, Tp1-2, Tp2-1, Tp2-2).

These rest periods (Tp1-1, Tp1-2, Tp2-1, Tp2-2) may be the same or different from each other.

Referring to FIG. 36A, the touch driving signal TDS in the first touch period TS1 existing between two display periods may include two or more pulses (first pulse, ..., last pulse) The pulses are driven at the first frequency (a).

The touch driving signal TDS in the second touch period TS2 existing between the other two display periods may include two or more pulses (first pulse, ..., last pulse) (b), < / RTI >

A first idle period TpI-1 defined as a time point at which the first touch period TS1 ends from the end of the last pulse of the touch driving signal TDS in the first touch period TS1 to the first touch period TS1, A first idle period Tp1-1 defined as a time point at which the first pulse of the touch driving signal TDS in the first touch period TS1 starts from the time when the first touch period TS1 starts, One or more of which may be present.

A second idle period Tp2- defined as a time point at which the second touch period TS2 ends from the end of the last pulse of the touch driving signal TDS in the second touch period TS2 to the second touch period TS2, And a second idle period Tp2-2 defined as a time point at which the first pulse of the touch driving signal TDS in the second touch period TS2 starts from the start of the second touch period TS2, One or more of which may be present.

A first idle period Tp1-1 preceding the pulses of the touch driving signal TDS in the first touch period TS1 and a second idling period Tp1-1 preceding the pulses of the touch driving signal TDS in the second touch period TS2, The rest periods (Tp2-1) may have the same length, but may be different.

A first idle period Tp1-2 following the pulses of the touch driving signal TDS in the first touch period TS1 and a second idle period Tp1-2 following the pulses of the touch driving signal TDS in the second touch period TS2, The rest periods (Tp2-2) may have the same length, but may be different.

Referring again to FIG. 36B, in a unit touch period concept, in each of two or more unit touch periods that use touch drive signals TDS of different frequencies, a pause period Tp1-1 (in which the touch drive signal TDS is not output) , Tp1-2, Tp2-1, and Tp2-2) may exist, and the lengths of the rest periods (Tp1-1, Tp1-2, Tp2-1, Tp2-2) in two or more unit touch periods may be the same Or may be different.

FIG. 36B shows a case where when multi-frequency driving is applied in one touch interval in the touch display device 100 according to the present embodiment, two unit touch periods UTS1 and UTS2 included in the same touch interval or another touch interval ) And a rest period (pulse non-application period).

Referring to FIG. 36B, the touch driving signal TDS in the first unit touch period UTS1 may include two or more pulses (first pulse, ..., last pulse) .

The touch driving signal TDS in the second unit touch period UTS2 may include two or more pulses (first pulse, ..., last pulse), which are driven at a second frequency (d)

A first idle period UTS1 defined as a time point at which the first unit touch period UTS1 ends from the end of the last pulse of the touch driving signal TDS in the first unit touch period UTS1, A first idle period Tp1-2 defined as a time point at which a first pulse of the touch driving signal TDS in the first unit touch period UTS1 starts from a time point when the first unit touch period UTS1 starts, (Tp1-1) may be present.

A second idle period UTS2 defined as a time point from the end of the last pulse of the touch driving signal TDS in the second unit touch period UTS2 to the end of the second unit touch period UTS2, A second idle period Tp2-2 defined as a time point at which the first pulse of the touch driving signal TDS in the second unit touch period UTS2 starts from the start of the second unit touch period UTS2 Tp-1) may be present.

A first idle period Tp1-1 preceding the pulses of the touch driving signal TDS in the second unit touch period UTS1 and a second idle period Tp1-1 preceding the pulses of the touch driving signal TDS in the second unit touch period UTS2 The lengths of the second idle periods Tp2-1 may be equal to each other, but they may be different.

A first idle period Tp1-2 following the pulses of the touch driving signal TDS in the second unit touch period UTS1 and a second idle period Tp1-2 following the pulses of the touch driving signal TDS in the second unit touch period UTS2 The second idle periods Tp2-2 may have the same length, but may be different.

Here, the unit touch period means a period in which the frequency of the touch drive signal TDS is the same. In one touch interval, there may be only one unit touch interval, and there may be two or more unit touch intervals.

The idle period in the above-described touch period can be variously utilized for display performance and efficiency, touch sensing performance and efficiency.

37 to 40 show a case where the touch display device 100 according to the present embodiments is driven by the H-sensing method and multi-frequency driving is applied within one display frame period, (Non-pulse application period) in the section.

FIG. 37 shows a case where the idle period in the touch period is utilized in the display period, and FIGS. 38 to 40 show the case where the idle period in the touch period is utilized in the touch period.

Referring to FIG. 37, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... can be utilized for display driving.

Accordingly, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are incorporated into the display periods DS2, DS3, ... , And the display sections DS2, DS3, ... can be secured even longer.

As described above, when the idle period in the touch period is used for the display driving, it can help to drive the display panel 110 of high resolution, and the display performance can be improved.

When the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are equal to each other, the lengths of the idle periods Tp1, Tp2, The display sections DS2, DS3, ..., which are long ensured to correspond to each other may also be the same.

When the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are different from each other, the lengths of the idle periods Tp1, Tp2, The display sections DS2, DS3, ..., which are long ensured to correspond, can be long.

Therefore, the segment lengths Tds1 and Tds2 of the display segments DS1, DS2, ... may be different from each other.

Referring to FIG. 38, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are used for other functions related to the touch sensing operation . For example, the touch sensing operation may be an operation for performing a process related to touch raw data.

For example, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, Can be used as a time for measuring the temperature.

Accordingly, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are eliminated and the respective touch periods TS1, TS2, Each section length can be shortened.

The lengths Tts1, Tts2, ... of the touch intervals TS1, TS2, ... may differ from each other when the lengths of the rest periods Tp1, Tp2, ... are different from each other.

Referring to FIG. 39, the idle periods Tp1, Tp2, ... corresponding to the non-output periods of the touch driving signals TDS in the respective touch periods TS1, TS2, ... are used for improving the touch sensing accuracy .

In this case, the segment lengths (Tts1, Tts2) of the touch segments (TS1, TS2, ...) can be maintained without reducing.

Referring to FIG. 40, the touch electrode TEa located farther from the touch sensing circuit 120 receives the touch driving signal TDS through the longer signal line Sla and receives the touch driving signal TDS from the touch sensing circuit 120 The touch electrode TEb positioned close to the touch electrode TEb receives the touch driving signal TDS through the relatively short signal line SLb.

The signal line length acts as a load on the signal transmission, which may affect the sensing accuracy.

The touch drive signal TDS actually applied to the touch electrode TEa located farther from the touch sensing circuit 120 due to the load deviation due to the deviation of the signal line length causes the touch which is located closer to the touch sensing circuit 120 The rising time and the polling time become longer than the touch driving signal TDS actually applied to the electrode TEb, so that the signal waveform can be more distorted.

As a result, the sensing accuracy may be lowered depending on the position of the touch electrode.

Therefore, in consideration of the distance from the touch sensing circuit 120 to the touch electrode TE (that is, the signal line length), the touch sensing circuit 120 drives the touch electrode Tea having a longer signal line length During the touch period TS2, one or more additional pulses serving as the touch driving signal TDS can be further output in the rest period Tp2 corresponding to the non-output period of the touch driving signal TDS.

The touch sensing circuit 120 determines the length of the signal transmission path with respect to the touch electrode TE in the touch sensing circuit 120 during the touch period TS2 for driving the touch electrode Tea having a longer signal line length The longer the distance to the touch electrode TE or the signal line length), the more number of additional pulses can be output in the idle period in the touch section driving the touch electrode TE.

When there are two or more display periods for the display mode and two or more touch intervals for the touch mode in one display frame period due to the additional pulse serving as the touch driving signal TDS, The number of pulses of the touch driving signal TDS may be different from the number of pulses of the touch driving signal TDS in the other touch period.

26 to 40, the multi-frequency driving method has been described based on 12 LHB driving. The multi-frequency driving method can be used not only for 12 LHB driving but also for various LHB driving.

Fig. 41 is another driving example in the case where the touch display device 100 according to the present embodiments is driven in the H-sensing manner. Fig. 42 shows a case where the touch display device 100 according to the present embodiment Frequency driving in one display frame interval, and a type of a used frequency in each touch interval in which single-frequency driving is performed.

41, when the touch display device 100 is driven in the H-sensing manner, the touch display device 100 displays three display periods DS1, DS2, and DS3 and three touch periods TS1, TS2, TS3) can be performed.

42, the frequency of the touch driving signal TDS used for the touch driving in the three touch periods (TS1, TS2, TS3) included in one display frame section is three or two Lt; / RTI >

In addition to the five used frequency sets illustrated in FIG. 42, more frequency sets may be created by varying the frequency order, frequency type, and the like.

FIG. 43 is another driving example of a case in which the touch display device 100 according to the present embodiments is driven in the H-sensing manner. FIG. 44 shows a case where the touch display device 100 according to the present embodiments is driven as shown in FIG. 43, when multi-frequency driving is applied within one display frame period, And the frequency used.

43, when the touch display device 100 is driven in the H-sensing manner, the touch display device 100 displays four display periods DS1, DS2, DS3, and DS4 and four touch intervals TS1, TS2, TS3, and TS4) can be performed.

44, the frequency of the touch driving signal TDS used for the touch driving in the four touch periods (TS1, TS2, TS3, TS4) included in one display frame period is four or Three, or two.

In addition to the six used frequency sets illustrated in FIG. 44, more frequent frequency sets may be created by varying the frequency order, frequency type, and the like.

FIG. 45 is another driving example of a case in which the touch display device 100 according to the present embodiments is driven in the H-sensing manner. FIG. 46 is a diagram illustrating a case where the touch display device 100 according to the present embodiments is driven as shown in FIG. 45, when multi-frequency driving is applied within one display frame period, And the frequency used.

Referring to FIG. 45, when the touch display device 100 is driven in the H-sensing manner, the touch display device 100 displays five display intervals DS1, DS2, DS3, DS4, and DS5 and five touch intervals TS1, TS2, TS3, TS4, and TS5).

46, the frequency of the touch driving signal TDS used for touch driving in the five touch periods (TS1, TS2, TS3, TS4, and TS5) included in one display frame period is 5 Branches or four, or three or two.

In addition to the five used frequency sets illustrated in FIG. 46, more frequency sets may be created by varying the frequency order, frequency type, and the like.

According to the embodiments, it is possible to provide a touch sensing method, a touch sensing circuit 120, and a touch display device 100 that can prevent the generation of unnecessary parasitic capacitance while improving the EMI level in a touch interval.

According to the embodiments, it is possible to provide a touch sensing method, a touch sensing circuit 120, and a touch display device 100 capable of performing multi-frequency driven touch driving that enables EMI improvement.

Here, the multi-frequency driving method is a touch driving method by varying the frequency of the touch driving signal. The frequency varying of the touch driving signal is a technique of adjusting a section length of a section (unit touch section) using a single frequency, And the number of pulses is controlled in a section using the pulse duration.

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: Touch sensing circuit
2310:
2320: sensing unit
2330: Signal generator
2400: Signal conversion section

Claims (22)

A display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of data lines and a plurality of sub pixels defined by the plurality of gate lines are arranged, The touch display device has two operation modes including a touch mode for a touch panel,
A plurality of touch electrodes built in the display panel; And
And a touch sensing circuit for outputting a pulse-type touch driving signal for sequentially driving at least one of the plurality of touch electrodes to sense a touch position or a touch position,
Wherein the frequency of the touch driving signal output from the touch sensing circuit is variable. The method according to claim 1,
There is at least two unit touch periods in which a touch driving signal of the same frequency is output, and the frequencies of the touch driving signals outputted in each of the two or more unit touch periods are different from each other. 3. The method of claim 2,
Wherein the unit lengths of the unit touch sections are different from each other. The method according to claim 1,
There is a rest period in which pulses are not output at least one of the front and back of the pulses corresponding to the touch driving signal in the section for touch sensing. 5. The method of claim 4,
The touch display device according to claim 1, wherein the stop period is different in each interval for touch sensing. The method according to claim 1,
The display section for the display mode and the touch section for the touch mode are alternately separated in terms of time,
Wherein the frequency of the touch driving signal outputted in one touch period is two or more. The method according to claim 1,
The display section for the display mode and the touch section for the touch mode are alternately separated in terms of time,
Wherein the frequency of the touch driving signal output in the first touch period is different from the frequency of the touch driving signal output in the second touch period. The method according to claim 1,
If there is one display period and one touch period in one display frame period,
Wherein the frequency of the touch driving signal outputted in one touch period is two or more. The method according to claim 1,
When there are two or more display periods and two or more touch intervals in one display frame period,
Wherein the frequency of the touch driving signal outputted in one touch period is two or more. The method according to claim 1,
When there are two or more display periods and two or more touch intervals in one display frame period,
Wherein the frequency of the touch driving signal outputted in one touch period is one, and the frequency of the touch driving signal output in one display frame period is two or more. The method according to claim 1,
Wherein at least two display sections for the display mode include an m-th display section and an n-th display section,
Wherein the at least two touch intervals for the touch mode include an m-th touch interval and an n-th touch interval,
After the m < th > display period, the m < th >
The n-th touch interval is performed after the n-th display period,
The sum of the section length of the m-th display section and the section length of the m-
Th display interval is equal to the sum of the interval length of the n-th display interval and the interval length of the n-th touch interval. The method according to claim 1,
If there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame period,
Wherein a duration of at least one of the two or more display intervals is different from a duration of the other display intervals.
The method according to claim 1,
If there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame period,
Wherein a duration of at least one of the two or more touch intervals is different from a duration of the other touch intervals. The method according to claim 1,
If there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame period,
Wherein the number of pulses of the touch driving signal is different from the number of pulses of the touch driving signal in a touch interval in which the number of pulses of the touch driving signal is different in at least one touch interval of the two or more touch intervals. The method according to claim 1,
If there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame period,
Wherein the number of frequency of the touch driving signal output during the one display frame period is equal to
Wherein the number of touch periods in the one display frame section is equal to or less than the number of touch periods in the one display frame section. The method according to claim 1,
If there are two or more display intervals for the display mode and two or more touch intervals for the touch mode in one display frame period,
Wherein the number of frequency of the touch driving signal output during the one display frame period is equal to
Wherein the number of touch periods in the one display frame section exceeds the number of touch sections in the one display frame section. The method according to claim 1,
Wherein the touch driving signal is applied to at least one of the plurality of touch electrodes,
A signal corresponding to a frequency and a phase of the touch driving signal or the touch driving signal is applied to all or a part of the plurality of data lines,
A signal corresponding to a frequency and a phase of the touch driving signal or the touch driving signal is applied to all or a part of the plurality of gate lines,
And a signal corresponding to a frequency and a phase of the touch driving signal or the touch driving signal is applied to all or a part of the remaining touch electrodes. The method according to claim 1,
Wherein the frequency pattern of the touch driving signal varies in one display frame period. The method according to claim 1,
Wherein the frequency pattern of the touch driving signal changes in a period of 1 / M (M: 2 or more natural number) of one display frame period. A display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of data lines and a plurality of sub pixels defined by the plurality of gate lines are arranged, A touch sensing method for a touch display device having two operation modes including a touch mode for a touch screen,
A touch driving step of outputting a pulse type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in the display panel during one touch interval or two or more touch intervals; And
Sensing a capacitance change in each of the plurality of touch electrodes to sense presence or absence of touch or a touch position,
Wherein the frequency of the touch driving signal output from the touch driving step is variable. A display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of data lines and a plurality of sub pixels defined by the plurality of gate lines are arranged, A touch sensing circuit, comprising: a touch sensing circuit for sensing a touch of a touch panel;
A driver for outputting a pulse-type touch driving signal for sequentially driving at least one of a plurality of touch electrodes built in the display panel; And
And a sensing unit sensing a capacitance change in each of the plurality of touch electrodes and sensing a touch position or a touch position,
Wherein the frequency of the touch driving signal output from the driving unit is variable. A touch sensing circuit included in a touch display device having two operation modes including a display mode for displaying an image and a touch mode for touch sensing,
Type touch driving signal for sequentially driving at least one of a plurality of touch electrodes for touch sensing,
Wherein the frequency of the output touch driving signal is variable.

Images