KR101580176B1 - A method of operating a touch panel - Google Patents

Abstract

An embodiment is directed to a method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line, wherein at least two of the driving lines are selected ; And simultaneously driving the selected two or more driving lines with driving signals, wherein each of the driving signals has three different levels of voltages.

Description

A METHOD OF OPERATING A TOUCH PANEL [0002]

The embodiment relates to a method of driving a tunnel panel.

A commonly used method for measuring the capacitance of each sensing node of the touch panel is to apply a pulse sequence of a specific frequency through a driving line by the driving unit And a signal received through a sensing line is measured by a sensing unit.

At this time, the frequency of the pulse waveform may receive various environmental noise (charger noise, fluorescent lamp noise, etc.), and avoiding measures for suppressing the influence of the environmental noise may be applied. In the sensing unit, an appropriate signal processing technique for extracting only the signal component corresponding to the magnitude of the capacitance may be used.

Embodiments provide a driving method of a touch panel capable of reducing a harmonic component included in a driving signal and improving sensitivity and jitter immunity.

An embodiment is directed to a method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line, wherein at least two of the driving lines are selected ; And simultaneously driving the selected two or more driving lines with driving signals, wherein each of the driving signals has three different levels of voltages.

Each of the driving signals may be a periodic signal and may have the three different levels of voltages within one period.

Each of the driving signals comprising: a first signal having a voltage of a first level; A second signal having a voltage of a second level; And a third signal having a voltage of a third level, and the voltage of the first level, the voltage of the second level, and the voltage of the third level may be voltages at different levels.

The voltage of the first level may be greater than the voltage of the second level, and the voltage of the second level may be greater than the voltage of the third level.

The voltage of the first level may be a positive voltage, the voltage of the second level may be 0, and the voltage of the third level may be a negative voltage.

The first signal and the third signal may be positioned alternating with each other, and the second signal may be positioned between the first signal and the third signal.

Wherein a duty ratio of the driving signal is greater than 0.25 and can be adjusted in a range smaller than 1, and a duty ratio of the driving signal is set such that a period of the first signal and a period of the third signal are .

The phase of the driving signal provided to at least one of the selected two or more driving lines may be different from the phase of the driving signals provided to the remaining driving lines.

The time of the first signal interval and the time of the third signal interval within one period may be equal to each other.

The second signal may be located in at least one of a previous or a third signal of the first signal.

Another embodiment is directed to a method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line, wherein at least two of the driving lines Selecting; And simultaneously driving the selected two or more driving lines with driving signals, wherein each of the driving signals is a periodic signal, and one period of each of the driving signals is a first period having a first level voltage A second period having a second level voltage lower than the first level voltage, and a third period having a third level voltage lower than the second level voltage.

The duty ratio of the driving signal may be adjusted in a range of greater than 0.25 and less than 1, and the duty ratio of the driving signal may be a ratio of the first section and the third section in one period have.

At least a part of the second section may be positioned between the first section and the third section within one period.

The time of the first section and the time of the second section may be the same.

The time of at least part of the second section located between the first section and the third section may be shorter than the time of the first section or the time of the second section.

The phases of the driving signals may be identical to each other.

The phase of the driving signal provided to at least one of the selected two or more driving lines may be different from the phase of the driving signals provided to the remaining driving lines.

Another embodiment is directed to a method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line, wherein at least two driving lines ; And simultaneously driving each of the selected two or more driving lines into a driving signal having two different levels of voltages; And receiving the superimposed signals of the simultaneously driven driving signals through the sensing lines, wherein the superimposed signal is a periodic signal having three different levels of voltages.

The overlapped signal may have a first period having a voltage of a first level, a second period having a voltage of a second level lower than the voltage of the first level, a third period of a third level lower than the voltage of the second level A third period having a voltage, and a fourth period having a voltage of the second level.

The embodiment can reduce the harmonic component included in the driving signal, and improve sensitivity and jitter immunity.

FIG. 1 shows a configuration diagram of a touch screen device according to an embodiment.
FIG. 2 shows an embodiment of a driving signal applied to two or more driving lines shown in FIG.
FIG. 3 shows an embodiment of a sensing circuit included in the sensing unit included in the driving unit shown in FIG.
4 shows an embodiment of a driving signal having two levels of voltage and a driving signal having three levels of voltage according to an embodiment.
Fig. 5 shows a simulation result of the harmonic component of the driving signal having the two-level voltage shown in Fig.
FIG. 6 shows a simulation result of a harmonic component of a driving signal according to the embodiment shown in FIG.
FIG. 7 shows a signal received by a sensing unit through a sensing line when driving signals having the same phase are simultaneously applied to two or more driving lines.
FIG. 8 shows an example in which at least one of the driving signals provided to the driving lines is different in phase.
Fig. 9 shows a method for simultaneously driving two driving lines according to the embodiment.
Figs. 10A to 10C show embodiments of the two driving signals shown in Fig.
11 shows a method of simultaneously driving two driving lines according to another embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure may be referred to as being "on" or "under" a substrate, each layer It is to be understood that the terms " on "and " under" include both " directly "or" indirectly " do. In addition, the criteria for the top / bottom or bottom / bottom of each layer are described with reference to the drawings.

In the drawings, dimensions are exaggerated, omitted, or schematically illustrated for convenience and clarity of illustration. Also, the size of each component does not entirely reflect the actual size. The same reference numerals denote the same elements throughout the description of the drawings. Hereinafter, a method of driving driving lines of a touch panel and a touch screen device according to embodiments will be described with reference to the accompanying drawings.

FIG. 1 shows a configuration diagram of a touch screen device 100 according to an embodiment.

Referring to FIG. 1, a touch screen device 100 includes a touch panel 10, a driving unit 20, a sensing unit 30, and a control unit 40.

The touch panel 10 has a substantially independent function and provides a plurality of sensing nodes P11 to Pnm, n, m> 1, which are present in different positions.

The sensing nodes P11 to Pnm, n, and m> 1 can be used in combination with coordinates, sensing points, nodes, or sensing node arrays.

For example, the touch panel 10 includes a plurality of sensing lines (Y1 to Ym, a natural number of m> 1), a plurality of sensing lines (driving lines, X1 to Xn, And a node capacitor (C11 to Cnm, n, m> 1) formed between the driving line and the sensing line.

The driving lines (natural numbers X1 to Xn, n> 1) may be mixed with a driving signal line, a driving electrode, or the like.

Also, the sensing lines (Y1 to Ym, a natural number of m> 1) may be mixed with a sensing signal line, a sensing electrode, or the like.

In FIG. 1, the driving lines and the sensing lines intersect with each other. However, the present invention is not limited thereto, and the driving lines and the sensing lines may not be intersected with each other.

Any one sensing node (e.g., P11) may be defined by a first node capacitor (e.g., C11) located between a first neighboring driving line (e.g., X1) and a first sensing line (e.g., Y1) .

For example, the driving line Xi (a natural number 0 <i? N) and the sensing line Yj (a natural number 0 <j? M) can be isolated from each other and the node capacitor Cij can be separated from the driving line Xi, (a natural number of < i? n) and a sensing line (Yj, a natural number of 0 <j? m).

For example, the touch panel 10 includes an electrode pattern layer (not shown) including a sensing electrode and a driving electrode disposed apart from each other, a substrate (not shown) disposed in front of the electrode pattern layer, And an insulating layer (not shown) disposed behind the electrode pattern layer. The layout of the electrode pattern layer can have various shapes depending on the design method.

The electrode pattern layer may be formed of a transparent conductive material such as ITO (Indium Tin Oxide), TO (Tin Oxide), IZO (Indium Zinc Oxide), ITZO (Indium Tin Zinc Oxide), IAZO (Indium Aluminum Zinc Oxide), IGZO Zinc Oxide), IGTO (Indium Gallium Tin Oxide), AZO (Aluminum Zinc Oxide), ATO (Antimony Tin Oxide), GZO (Gallium Zinc Oxide), carbon nanotubes, conductive polymer, silver or copper transparent ink .

The electrode pattern layer may be applied to at least one layer made of glass or plastic to form a sensing node array (P11 to Pnm, n, natural number of m> 1).

The substrate may be in the form of a dielectric film having a high light transmittance and may include at least one of glass, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PI (polyimide), or acrylic.

The insulating layer may be a light-transmitting insulating layer such as PET. In another embodiment, a shield layer (not shown) may be disposed under the insulating layer to remove electromagnetic interference (EMI) and noise introduced into the electrode pattern layer.

The touch panel 10 may be merged with a layer for a display according to an appropriate panel design method and may share a path for driving or sensing.

A touch panel that is not coupled to the display can be configured in a suitable manner to form a two-dimensional sensing node array, and embodiments can be applied to both touch sensing systems configured with a two-dimensional sensing node array.

The driving unit 20 is electrically connected to a plurality of driving lines X1 to Xn, n> 1, and is capable of providing a driving signal to the driving line.

For example, the driving unit 20 may simultaneously provide a driving signal to two or more driving lines among a plurality of driving lines (X1 to Xn, natural number of n> 1).

Here, "concurrent" may include not only events occurring almost simultaneously but also events occurring precisely simultaneously. For example, concurrent events may mean starting almost at the same time, ending almost at the same time, and / or occurring at least partially overlapping time periods.

At this time, the driving signal applied to two or more driving lines may have three different levels of voltages and may be a periodic signal.

For example, a driving signal applied to two or more driving lines may have three different levels of voltages within one period.

FIG. 2 shows an embodiment of a driving signal Vd applied to two or more driving lines shown in FIG.

Referring to FIG. 2, the driving signal Vd may have a first level voltage + Vp, a second level voltage Vss, and a third level voltage -Vn, The voltage (+ Vp), the voltage of the second level (Vss), and the voltage of the third level (-Vn) may be voltages at different levels.

For example, the driving signal Vd includes a first signal V1 having a first level voltage + Vp, a second signal V2 having a second level voltage Vss, and a third level voltage And the third signal V3 having the first level (+ Vp), the second level voltage (Vss), and the third level voltage (-Vn) Lt; / RTI &gt;

The first level voltage + Vp may be greater than the second level voltage Vss and the second level voltage Vss may be greater than the third level voltage -Vn (+ Vp > Vss > Vn).

For example, the voltage (+ Vp) of the first level may be a positive voltage, the voltage (Vss) of the second level may be zero, and the voltage (-Vn) (-). &Lt; / RTI &gt;

The first signal V1 and the third signal V3 may be alternately positioned and the second signal V2 may be positioned between the first signal V1 and the third signal V3. The second signal V2 may also be located in at least one of the previous or the third signal V3 of the first signal V1.

The section of the first signal V1 in the period T of the driving signal Vd is divided into the first section Ta1 and the second section V2 in the second section Ta2 and the third section V3 ) May be referred to as a third section Ta3.

Therefore, one period T of the driving signal Vd may include a first period Ta1, a second period Ta2, and a third period Ta3. In one period T, At least a part of the second section Ta2 may be positioned between the third section Ta1 and the third section Ta2.

The time of at least part of the second section Ta2 located between the first section Ta1 and the third section Ta3 may be shorter than the time of the first section Ta1 or the time of the second section Ta2 .

The time of the first section Ta1 and the time of the third section Ta3 may be equal to each other but the present invention is not limited thereto. In another embodiment, the time of the first section Ta1 and the time of the third section Ta3 Time may be different.

The duty ratio DR of the driving signal Vd may be greater than 0.25 and less than 1 (0.25 < DR < 1). That is, the duty ratio of the driving signal Vd can be adjusted within a range of greater than 0.25 and less than 1. When the duty ratio of the duty ratio DR of the driving signal Vd is less than 0.25, the average power of the driving signal Vd to be transmitted may be reduced to 1/4, It can be reduced by 6 dB or more.

Here, the duty ratio DR of the driving signal may be a ratio of a period Ta1 + Ta3 obtained by adding the first period Ta1 and the third period Ta2 to the second period Ta2 within one period T (Ta1 + Ta3) / T).

The dotted line portion shown in Fig. 2 represents a driving signal VE having two different levels of voltages. The driving signal VE changes from the voltage (+ Vp) of the first level to the voltage (-Vn) of the third level at the half cycle time T / 2. The instantaneous signal change amount of the driving signal VE at the half period (T / 2) may be Vp + Vn.

On the other hand, in the embodiment, the instantaneous signal variation amount of the driving signal Vd at the first time point t1 may be Vp, and the instantaneous signal variation amount of the driving signal Vd at the second time point t2 may be Vn .

The instantaneous signal change amount Vp or Vn of the driving signal Vd according to the embodiment is smaller than the instantaneous signal variation amount Vp + Vn of the driving signal VE within one period.

Thus, since the driving signal VE has three different levels within one period, the harmonic components included in the driving signal Vd can be reduced.

4 shows an embodiment of a driving signal having a voltage of two levels and a driving signal having a voltage of three levels according to an embodiment, FIG. 5 shows a driving signal having a voltage of two levels shown in FIG. 4, FIG. 6 shows a simulation result of the harmonic component of the driving signal according to the embodiment shown in FIG.

In Fig. 4, a solid line indicates a driving signal according to the embodiment, and a dotted line indicates a driving signal having a voltage of two levels.

Referring to FIGS. 4 to 6, it can be seen that the harmonic components shown in FIG. 5 are smaller than the harmonic components shown in FIG.

Also, as the harmonic components included in the driving signal are reduced, the sensitivity and the jitter immunity of the sensing unit can be improved.

The phases of driving signals applied to each of the two or more driving lines may be identical to each other.

For example, the driving signals Vd shown in FIG. 2 may be simultaneously applied to two or more driving lines in the same phase with each other.

The superimposed signal Vc (see FIG. 3) received by the sensing unit 30 may be a signal having three different levels of voltage.

Here, the term "superimposed signal Vc" refers to a signal generated according to a result of superposition of driving signals received by a sensing line (e.g., Yj in FIG. 3) connected to sensing nodes corresponding to two or more driving lines (Vc).

FIG. 7 shows a signal received by a sensing unit through a sensing line when driving signals having the same phase are simultaneously applied to two or more driving lines.

7, when the phases of driving signals Vd applied to two driving lines (for example, X1 and X2) are the same, the sensing unit 30 is driven by the sensing line Y1 by the principle of superposition, The magnitude of the signal Vc (see FIG. 3) received by the driving signal line (for example, FIG. 3) may be twice the magnitude of the driving signal Vd applied to one driving line (for example, X1 and X2).

On the other hand, the amount of change of the superimposed signal Vc received by the sensing unit 30 is smaller than the first change amount. At this time, the first variation amount is a value obtained by dividing a driving signal having two levels of voltage into two driving lines (e.g., X1 and X2) in the same phase (hereinafter referred to as " first case " The signal change amount of the signal.

The superimposed signal Vc (see FIG. 3) received by the sensing unit 30 may be a signal having three different levels of voltage. For example, the superimposed signal Vc (see FIG. 3) received by the sensing unit 30 is applied to the fourth level voltage + 2Vp, the second level voltage Vss, and the fifth level voltage -2Vn, Lt; / RTI &gt;

The embodiment can reduce the maximum peak current of the signal Vc superimposed on the sensing unit 30 compared to the first case, so that the design specification of the sensing unit 30 can be lowered than the first case.

As the magnitude of the superimposed signal (Vc in FIG. 9) received by the sensing unit 30 increases, the signal-to-noise ratio of the sensing signal (Vs in FIG. 3) Can be improved.

Also, the phase of the driving signal provided to at least one of the two or more selected driving lines may be different from the phase of the driving signals provided to the remaining driving lines.

For example, the driving signal Vd shown in FIG. 2 may be applied to two or more driving lines at the same time with different phases.

FIG. 8 shows an example in which at least one of the driving signals provided to the driving lines is different in phase.

8, the phase of a driving signal provided to at least one (e.g., X2) of driving lines, e.g., an odd number of driving lines X1, X2, X3, And may be different from the phase of the provided driving signal.

The phase of the driving signal provided to at least one of the three driving lines (e.g., X1, X2, X3) (e.g., X2) is 180 degrees or half the period of the driving signal provided to the rest The phase difference can be caused.

For example, the phases of the driving signals provided to the first driving line and the third driving line may be identical to each other, and may be different from the phase of the driving signal provided to the second driving line X2.

The sensing unit 30 may be electrically connected to a plurality of sensing lines Y1 to Ym and a natural number of m> 1 to sense a capacitance of a node capacitor between a driving line to which a driving signal is applied and a corresponding sensing line .

The driving unit 20 may provide the driving signal Vd to the driving lines X1 to Xn and a natural number of n> 1 and the sensing unit 30 may supply the sensing signals Y1 to Ym, And a sensing circuit for sensing signals received through the sensing circuit.

Fig. 3 shows an embodiment of the sensing circuit 30-j included in the sensing unit 30 shown in Fig.

3 shows only the sensing circuit 30-j connected to the i-th driving line Xi and the j-th sensing line Yj, the sensing unit 30 actually includes m sensing lines Y1 To Ym, a natural number of m > 1).

Referring to Fig. 3, the sensing circuit 30-j may include an amplifier 31, and a capacitor 32. Fig.

The amplifier 31 includes a first input terminal 201 (for example, an inverting terminal) connected to the sensing line Yj, a second input terminal 202 (for example, a non-inverting terminal) connected to the second power source Vss, Or a differential amplifier including an output terminal 203 for outputting a sensing signal Vs. 3 shows an operational amplifier as an example of the amplifier 31, but is not limited thereto.

The capacitor 32 is electrically connected between the first input terminal 201 and the output terminal 203 of the amplifier 31 and outputs an output of the amplifier 31 to the first input terminal 201 through a negative feedback ), And can determine the gain of the sensing signal Vs.

The signal Vc received by the sensing circuit 30-j may be a signal in which two or more driving signals simultaneously driven through the sensing line Yj are superimposed.

That is, two or more simultaneously driven driving signals may be superimposed on the sensing line Yj, and the superimposed signal Vc may be received by the sensing unit 30. [

The control unit 40 controls the operation of the driving unit 20 and the sensing unit 30. [

For example, the control unit 40 can generate the driving control signal Sx for controlling the driving unit 20 and the sensing control signal Sy for controlling the sensing unit 30, The operation of the driving unit 20 and the sensing unit 30 can be controlled by the sensing control signal Sy.

The control unit 40 may sense the signal Vc received by the sensing line Yj and may control the sensing unit 30 to output the sensing signal Vs according to the sensed result.

As described above, the embodiment provides a driving signal having three different levels of voltages to two or more driving lines, thereby reducing the harmonic component included in the driving signal and reducing the sensitivity and jitter immunity jitter immunity can be improved. This is because it is easy to detect a desired signal and a noise signal separately as the harmonic component included in the driving signal decreases.

In addition, the embodiment can compensate the delay time due to parasitic capacitance caused by the touch panel 10 and the substrate (e.g., PCB) by adjusting the duty ratio DR of the driving signal Vd, Accordingly, stable operation of the touch screen device 100 can be ensured.

In addition, the embodiment can reduce the instantaneous peak current by reducing the signal variation amount of the driving signal Vd, thereby improving the glitch of the signal received by the sensing unit, and the circuit implementation of the sensing unit 30 It can be easy.

Fig. 9 shows a method for simultaneously driving two driving lines according to the embodiment.

9, it is possible to simultaneously drive two driving lines (e.g., X1 and X2) selected from among a plurality of driving lines (X1 to Xn, n> 1) For example, each of the driving signals (e.g., Vd1 and Vd2) that simultaneously drive X1 and X2 may have two different levels of voltages.

The embodiment adjusts the magnitude of the phase and voltage of the driving signals having two different levels of voltage so that the superimposed signal Vc received by the sensing unit 30 through the sensing line (e.g., Y1) May have different levels of voltages, and may be periodic signals having a constant period (T).

Here, the term "superimposed signal Vc" refers to a sensing line (for example, see FIG. 3) connected to sensing nodes (for example, C11 and C21 in FIG. 3) corresponding to two driving lines (e.g., X1 and X2) (E.g., Vd1 and Vd2) received by the driver Y1.

The superimposed signal Vc received by the sensing unit 30 may be a periodic signal.

One period T of the superimposed signal Vc may be divided into a first period T1 to a fourth period T1 to T4 which are sequentially arranged and the superimposed signal Vc during one period T is divided into a first A second section having a voltage of a second level, a third section having a voltage of a third level, and a fourth section having a voltage of a second level in sequence.

The voltage of the first level, the voltage of the second level, and the voltage of the third level may be voltages at different levels. The voltage of the first level is the largest, the voltage of the third level is the smallest, and the voltage of the second level may be the middle thereof (Va1 > Va2 > Va3).

For example, the voltage of the first level may be a positive voltage, the voltage of the second level may be zero, and the voltage of the third level may be a negative voltage.

For example, the superimposed signal Vc received by the sensing unit 30 includes a first signal Va1 having a voltage of a first level, a second signal Va2 having a voltage of a second level, And a third signal Va3 having a voltage.

The first signal Va1 and the third signal Va3 may be alternately positioned and the second signal Va2 may be positioned between the first signal Va1 and the second signal Va2.

For example, the superimposed signal Vc may be the first signal Va1 during the first section T1, the second signal Va2 during the second section T2, and the second signal Va2 during the third section T3 May be the third signal Va3, and may be the second signal Va2 during the fourth interval.

The voltage of the driving signal provided to any one of the two driving lines during the first period T1 may be a voltage of the first level and the voltage of the driving signal provided to the other one may be the voltage of the second level have. Or the voltage of the driving signal provided to the two driving lines during the first period T1 may all be the voltage of the first level.

For example, the voltages (e.g., A1, B1) of the driving signals Vd1 and Vd2 provided to the two driving lines (e.g., X1 and X2) during the first period T1 are (+, 0) +, &Lt; / RTI &gt; +).

The voltage of the driving signal provided to any one of the two driving lines during the second period T2 and the fourth period T4 may be a first level voltage and the voltage of the driving signal provided to the other one may be And may be a third level voltage. Or the voltage of the driving signal provided to the two driving lines during the second period T2 and the fourth period T4 may all be the voltage of the second level.

For example, the voltages (e.g., A2, B2) of the driving signals Vd1 and Vd2 provided to the two driving lines (e.g., X1 and X2) during the second period T2 are (0, 0) +, -). &Lt; / RTI &gt; The voltages (e.g., A4 and B4) of the driving signals Vd1 and Vd2 provided to the two driving lines (e.g., X1 and X2) during the fourth period T4 are (0, 0) or (+ -). &Lt; / RTI &gt;

The voltage of the driving signal provided to any one of the two driving lines during the third period T3 may be a voltage of the third level and the voltage of the driving signal provided to the other one may be the voltage of the second level have. Or the driving signal provided to the two driving lines during the third period T3 may all be a third level voltage.

For example, the voltages (e.g., A3, B3) of the driving signals Vd1 and Vd2 provided to the two driving lines (e.g., X1 and X2) during the third period T3 are (-, - -, 0).

Where + represents the voltage of the first level, 0 represents the voltage of the second level, and - represents the voltage of the third level.

Although FIG. 9 shows an example in which two driving lines are driven at the same time, the embodiment is not limited thereto.

For example, by adjusting the phase and magnitude of the driving signals provided to two or more driving lines, the superimposed signal Vc received by the sensing unit 30 during each of the periods T1 to T4 is obtained as shown in FIG. 9 .

Figs. 10A to 10C show embodiments of the two driving signals Vd1 and Vd2 shown in Fig.

10A to 10C, each of the first driving signal Vd1 and the second driving signal Vd2 includes a first level voltage + Vp, a second level voltage Vss, And a voltage (-Vn).

By adjusting the phase and voltage magnitudes of the first driving signal Vd1 and the second driving signal Vd2 during the first to fourth intervals T1 to T4, Vc) may have three different levels of voltages (Vap, Vss, Van) during one period (T).

11 shows a method of simultaneously driving two driving lines according to another embodiment.

Referring to FIG. 11, each of driving signals Vd1 and Vd2 that simultaneously drive selected two driving lines (e.g., X1 and X2) may have two different levels of voltages.

Also, each of the driving signals Vd1 and Vd2 that simultaneously drive the two selected driving lines (e.g., X1 and X2) may be a periodic signal having a constant period and may have the same phase.

The voltages of the first driving signal Vd1 and the second driving signal Vd2 in the first through fourth sections T1 through T4 may be equal to each other.

For example, the voltage of the first driving signal Vd1 and the voltage of the second driving signal Vd2 may be a first level voltage (+ Vp) in the first section T1 and the voltages of the second section T2 and the fourth The voltage of the first driving signal Vd1 and the voltage of the second driving signal Vd2 in each of the periods T4 may be the voltage Vss of the second level and the voltage of the first driving signal Vd1 And the second driving signal Vd2 may be the third level voltage -Vn.

The embodiment adjusts the phase and voltage magnitude of the two driving signals (e.g., Vd1, Vd2) so that the superimposed signal Vc received by the sensing unit 30 through the sensing line (e.g., Y1) It is possible to have voltages of different levels.

Since the superimposed signal Vc received by the sensing unit 30 has three different levels of voltages, the harmonic component of the superimposed signal Vc can be reduced, Filter requirements can be reduced. Also, when the driving signals Vd1 and Vd2 have the same phase, the influence of the interference of the driving lines (e.g., X1 and X2) can be reduced.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments can be combined and modified by other persons having ordinary skill in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

10: touch panel 20: driving part
30: sensing unit 30-1: sensing circuit
40: Control units X1 to Xn: Driving lines
Y1 to Ym: sensing lines C11 to Cnm: node capacitors
P11 to Pnm: sensing nodes.

Claims (20)

A method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line,
Selecting at least two driving lines among the driving lines; And
Driving the selected two or more driving lines simultaneously with the driving signals so that the superimposed signal received by the sensing line has three different levels of voltages for one period,
Each of the driving signals includes:
Periodic signal, having three different levels of voltages in one period,
Wherein the superimposed signal is a signal generated according to a result of superposition of the simultaneously driven driving signals received by the sensing line. The method according to claim 1,
The superimposed signal includes a first section having a voltage of a first level, a second section having a voltage of a second level, and a third section having a voltage of a third level,
Wherein the voltage of the first level, the voltage of the second level, and the voltage of the third level are voltages at different levels, and the first to third intervals are sequential. 2. The method of claim 1, wherein each of the driving signals comprises:
A first signal having a first level of voltage;
A second signal having a voltage of a second level; And
A third signal having a third level of voltage,
Wherein the voltage of the first level, the voltage of the second level, and the voltage of the third level are voltages at different levels. The method of claim 3,
Wherein the voltage of the first level is higher than the voltage of the second level and the voltage of the second level is higher than the voltage of the third level. 5. The method of claim 4,
Wherein the voltage of the first level is a positive voltage, the voltage of the second level is 0, and the voltage of the third level is a negative voltage. 5. The method of claim 4,
Wherein the first signal and the third signal are located alternately and the second signal is positioned between the first signal and the third signal. The method of claim 3,
The duty ratio of the driving signal is adjusted in a range of greater than 0.25 and less than 1,
Wherein the duty ratio of the driving signal is a ratio of a period of the first signal to a period of the third signal within one period. The method according to claim 1,
And the phases of the driving signals are identical to each other. The method according to claim 1,
Wherein a phase of the driving signal provided to at least one of the two or more selected driving lines is different from a phase of driving signals provided to the remaining driving lines. The method of claim 3,
Wherein the time of the first signal interval and the time interval of the third signal are equal to each other within one period. The method according to claim 6,
Wherein the second signal is located in at least one of a previous or a third signal of the first signal. A method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line,
Selecting at least two driving lines among the driving lines; And
Driving the selected two or more driving lines simultaneously with the driving signals so that the superimposed signal received by the sensing line has three different levels of voltages for one period,
Each of the driving signals is a periodic signal,
Wherein one cycle of each of the driving signals includes a first period having a first level voltage, a second period having a second level voltage lower than the first level voltage, and a second period having a third Level voltage, the third section having a voltage of the second level,
Wherein the superimposed signal is a signal generated in accordance with a result of superposition of the simultaneously driven driving signals received by the sensing line. 13. The method of claim 12,
The duty ratio of the driving signal is adjusted in a range of greater than 0.25 and less than 1,
Wherein the duty ratio of the driving signal is a ratio occupied by the first section and the third section within one period. 13. The method of claim 12,
Wherein at least a part of the second section is positioned between the first section and the third section within one period. 15. The method of claim 14,
Wherein the time of the first section is equal to the time of the second section. 15. The method of claim 14,
Wherein the time of at least part of the second section located between the first section and the third section is shorter than the time of the first section or the time of the second section. 13. The method of claim 12,
And the phases of the driving signals are identical to each other. 13. The method of claim 12,
Wherein a phase of the driving signal provided to at least one of the two or more selected driving lines is different from a phase of driving signals provided to the remaining driving lines. A method of driving a touch panel including driving lines, sensing lines, and a node capacitor formed between a neighboring driving line and a sensing line,
Selecting at least two driving lines among the driving lines; And
Simultaneously driving each of the selected two or more driving lines into a driving signal having two different levels of voltages; And
And receiving signals superposed on the simultaneously driven driving signals through the sensing lines,
Wherein the superimposed signal is a periodic signal having three different levels of voltages during one period. 20. The method of claim 19,
The overlapped signal may have a first period having a voltage of a first level, a second period having a voltage of a second level lower than the voltage of the first level, a third period of a third level lower than the voltage of the second level A third period having a voltage, and a fourth period having a voltage of the second level.

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