CN103336644B - Touch sensing device and driving method thereof - Google Patents

Abstract

The invention relates to a touch sensing device and a driving method thereof. The touch device comprises a plurality of first sensing electrodes arranged along a first direction, a plurality of second sensing electrodes arranged along a second direction and intersecting with the first sensing electrodes in an electric insulation manner, and a plurality of touch induction signals output by responding to touch scanning signals loaded on the first sensing electrodes. The minimum duration of the touch scanning signals loaded on the first sensing electrodes is defined as a scanning period, and the driving method comprises the following steps: in each scanning period, a plurality of touch scanning signals are loaded to the first sensing electrodes at the same time, a low-potential touch scanning signal is provided to the corresponding first sensing electrode to represent that the corresponding first sensing electrode is in a scanned state, and a high-potential touch scanning signal is provided to the rest of the first sensing electrodes to represent that the rest of the first sensing electrodes are in an unscanned state.

Description

Touch sensing device and driving method thereof

technical field

The present invention relates to a touch sensing device, in particular to a driving method of the touch sensing device.

Background technique

With the continuous innovation of technology, touch sensing devices have been widely used in various electronic devices, such as display devices, etc. The touch sensing device saves the setting of buttons and increases the available display space of the display device. Currently more popular capacitive touch sensing devices, when the user touches the capacitive touch sensing device with a finger, the proximity and touch of the finger will cause changes in the capacitance of the sensing electrode itself and the coupling capacitance. Changes to determine the location of the finger touch.

During the use of the touch sensing device, due to the influence of environmental factors, some noise signals are often introduced. If the noise signal is too large, it may cause the touch sensing signal generated by the sensing structure in the touch sensing device to appear. errors, thereby affecting the accuracy of determining the touch position. Usually, the signal-to-noise ratio (SNR) is used to represent the ratio of the variation of the touch sensing signal to the noise, so as to measure the ability of the touch sensing device to suppress the noise. Based on this, how to improve the signal-to-noise ratio (SNR) is the primary technical problem to be solved in this case at present.

Contents of the invention

In view of this, a driving method for driving a touch sensing device capable of improving the signal-to-noise ratio is provided.

Further, a touch sensing device capable of improving the signal-to-noise ratio is provided.

A method for driving a touch sensing device, the touch device comprising a plurality of first sensing electrodes arranged along a first direction, a plurality of first sensing electrodes arranged along a second direction and electrically insulated from and intersecting with the plurality of first sensing electrodes second sensing electrodes, the plurality of second sensing electrodes are used to output a plurality of touch sensing signals in response to the touch scanning signals loaded on the plurality of first sensing electrodes, wherein the plurality of touch scanning The minimum duration of signal loading on the plurality of first sensing electrodes is defined as a scanning period, and the driving method includes:

In each scanning period, a plurality of touch scanning signals are simultaneously applied to the plurality of first sensing electrodes, and low-potential touch scanning signals are provided to the corresponding first sensing electrodes to represent the corresponding first sensing electrodes. The electrodes are in a scanned state, and a high potential touch scanning signal is provided to the remaining first sensing electrodes to indicate that the remaining first sensing electrodes are in an unscanned state;

A delay period is inserted between adjacent scan periods, and a low potential touch scan signal is provided to the corresponding first sensing electrodes in the delay period.

A touch sensing device, comprising: a plurality of first sensing electrodes arranged along a first direction, a plurality of second sensing electrodes arranged along a second direction and electrically insulated and intersecting with the plurality of first sensing electrodes , the plurality of second sensing electrodes are used to output a plurality of touch sensing signals in response to touch scanning signals loaded on the plurality of first sensing electrodes, wherein the plurality of touch scanning signals are loaded on the plurality of first sensing electrodes The minimum duration on the first sensing electrodes is defined as a scanning period. In each scanning period, a plurality of touch scanning signals are simultaneously applied to the plurality of first sensing electrodes, and low-potential touch scanning signals are provided to the plurality of first sensing electrodes. The corresponding first sensing electrode indicates that the corresponding first sensing electrode is in a scanned state, and provides a high potential touch scanning signal to the remaining first sensing electrodes to indicate that the remaining first sensing electrodes are in a state of being scanned. In an unscanned state: a delay period is inserted between adjacent scan periods, and a low-potential touch scan signal is provided to the corresponding first sensing electrode in the delay period.

Compared with the prior art, a low-potential touch scanning signal is provided to the first sensing electrode to indicate that the first sensing electrode is in a scanning state, and a high-potential touch scanning signal is provided to the first sensing electrode that is not in a scanning state. A sensing electrode, so that the touch sensing signal received by the second sensing electrode is significantly improved, that is, the noise is reduced under the condition that the received touch sensing signal is kept unchanged, thereby effectively The signal-to-noise ratio of the touch sensing device is improved.

Description of drawings

FIG. 1 is a schematic plan view of a touch structure of a touch sensing device.

FIG. 2 is a schematic diagram of an equivalent circuit of the first sensing electrode and the second sensing electrode shown in FIG. 1 .

FIG. 3 is a timing diagram of a first embodiment of a plurality of touch scanning signals St ₁ -St _n provided by a driving circuit within a frame scanning time.

FIG. 4 is a timing diagram of a second embodiment of a plurality of touch scanning signals St ₁ -St _n provided by the driving circuit within one frame scanning time.

FIG. 5 is a timing diagram of a third embodiment of a plurality of touch scanning signals St ₁ -St _n provided by the driving circuit within one frame scanning time.

FIG. 6 is a timing diagram of a fourth embodiment of a plurality of touch scanning signals St ₁ -St _n provided by the driving circuit within one frame scanning time.

FIG. 7 is a timing diagram of a fifth embodiment of a plurality of touch scanning signals St ₁ -St _n provided by the driving circuit within one frame scanning time.

FIG. 8 is a flowchart of a driving method for driving a touch sensing device.

Description of main component symbols

Touch Sensing Device 10

The first sensing electrodes 11, Tx ₁ , Tx ₂ , Tx ₃ , ... Tx _n

drive circuit 12

The second sensing electrodes 13, Rx ₁ , Rx ₂ , Rx ₃ , ... Rx _m

Sensing circuit 14

Drive signal line 15

Sensing signal line 16

Touch scan signal St ₁ -St _n

Touch sensing signal Sr ₁ -Sr _m

Sensing circuit 14

Capacitance C

Resistance R

Impedance Z

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 , which is a schematic plan view of a touch sensing device 10 . The touch sensing device 10 includes a plurality of first sensing electrodes 11 arranged in parallel along the first direction (X direction). For the convenience of description, the plurality of first sensing electrodes 11 are marked as Tx ₁ , Tx ₂ , and Tx respectively. _3. ... Tx _n , n is a natural number greater than 1; a drive circuit 12; a plurality of second sensing electrodes 13 arranged in parallel along the second direction (Y direction), the plurality of second sensing electrodes 13 and the first A sensing electrode 11 is insulated and intersected to form a plurality of capacitive structures (not marked). For the convenience of description, the plurality of second sensing electrodes 13 are respectively marked Rx ₁ , Rx ₂ , Rx ₃ , ... Rx _m , m is a natural number greater than 1; and a sensing circuit 14 .

The plurality of first sensing electrodes 11 are respectively electrically connected to the driving circuit 12 through a plurality of driving signal lines 15, so that the plurality of touch scanning signals St ₁ -St _n output by the driving circuit 12 are respectively driven through corresponding driving signals. The signal line 15 is transmitted to the plurality of first sensing electrodes 11 . The driving circuit 12 cyclically provides the plurality of touch scan signals St ₁ -St _n , wherein the touch scan signals St ₁ -St _n include a high potential touch scan signal and a low potential touch scan signal. It can be understood that, when all the driving electrodes Tx ₁ -Tx _n complete one scan, the corresponding time length is defined as a frame scan time. In the present invention, within a frame scanning time, the minimum duration of the touch scanning signals St ₁ -St _n provided by the driving circuit 12 to the driving electrodes Tx ₁ -Tx _n is defined as a scanning period. In each scanning period, a plurality of touch scanning signals St ₁ -St _n are applied to the plurality of first sensing electrodes T _x1 -T _xn at the same time, when the low potential touch scanning signals St ₁ -St _n are given to the corresponding When the first sensing electrode 11 of the corresponding first sensing electrode 11 is in the state of being scanned, at the same time, the high potential touch scanning signal St ₁ -St _n is provided to the remaining first sensing electrodes 11 electrodes 11 to indicate that the rest of the first sensing electrodes 11 are in an unscanned state.

The plurality of second sensing electrodes 13 are respectively electrically connected to the sensing circuit 14 through a plurality of sensing signal lines 16, and respond to the plurality of touch scanning signals St ₁ -St _n acting on the capacitive structure to output corresponding The touch sensing signals Sr ₁ -Sr _m are sent to the sensing circuit 14 . The sensing circuit 14 determines the position of the touched point of the touch sensing device 10 according to the plurality of touch sensing signals Sr ₁ -Sr _m .

Please refer to FIG. 2 , which is an equivalent circuit diagram of a circuit structure formed by a plurality of first sensing electrodes 11 and a second sensing electrode 13 , such as the second sensing electrode Rx ₁ , in FIG. 1 . The equivalent circuit diagram of the other second sensing electrodes 13 and each of the first sensing electrodes 11 is the same as the equivalent circuit diagram shown in FIG. 2 , which will not be repeated in this embodiment.

Among them, R11-R1n represents the equivalent resistance of the first sensing electrodes Tx ₁ -Tx _n ; C11-C1n represents the self-inductance capacitance of the first sensing electrodes Tx ₁ -Tx _n to ground; C21-C2n represent the first sensing electrodes respectively The mutual inductance capacitance formed by the measuring electrodes Tx ₁ -Tx _n and the second sensing electrode Rx ₁ respectively, that is, the aforementioned capacitance structure; C31 represents the self-inductance capacitance of the second sensing electrode Rx ₁ to ground; R1 represents the second sensing electrode Rx 1 The equivalent resistance of the measuring electrode Rx ₁ ; Z1 represents the equivalent impedance between the sensing signal line 16 and the ground.

As shown in FIG. 2, the equivalent resistance R11-R1n of the _first sensing electrode Tx1 _- Txn, the mutual inductance capacitance C21- _C2n , and the equivalent resistance R1 of the second sensing electrode Rx1 are connected in series with the driving circuit 12 and the sensing Between the circuits 14; one end of the self-inductance capacitor C11-C1n of the first sensing electrodes Tx ₁ -Tx _n to the ground is electrically connected to the node between the effective resistance R11-R1n and the mutual inductance capacitor C21-C2n, and the other end is grounded; One end of the self-inductance capacitor C31 of the two sensing electrodes Rx ₁ to ground is electrically connected to the node between the self-inductance capacitor C11-C1n and the equivalent resistance R1, and the other end is grounded; the equivalent impedance Z1 is electrically connected to the equivalent resistance R1 and between.

Please refer to FIG. 3 , wherein, FIG. 3 is a timing diagram of a first embodiment of a plurality of touch scanning signals St ₁ -St _n within a frame scanning time. In this embodiment, the duration of each scanning period is the same. The driving circuit 12 provides n touch scanning signals St ₁ -St _n to the n first sensing electrodes Tx ₁ -Tx _n in each scanning period T, wherein, during the scanning period T ₁ -T _n , According to the arrangement order of the plurality of first sensing electrodes Tx ₁ -Tx _n , low-potential touch scanning signals are sequentially provided to corresponding first sensing electrodes 11, and during the same scanning period, the rest of the first sensing electrodes 11 is supplied with a high-potential touch scanning signal. At this time, the first sensing electrodes 11 loaded with the touch scan signal of low potential are considered to be in the scanned state, and the first sensing electrodes 11 loaded with the touch scan signal of high potential are considered to be in the unscanned state. The state being scanned. In this embodiment, each touch scanning signal St ₁ -St _n is a square wave signal with the same pulse width, and the high potential is represented by 1, and the low potential is represented by 0.

Specifically, for example, in the first scanning period T1, the first sensing electrode Tx ₁ is in the scanning state, the touch scanning signal St ₁ provided to the first sensing electrode Tx ₁ is a low potential, and at the same time, the touch scanning signal St 1 supplied to the rest of the sensing electrodes Tx 1 is not in the scanning state. The touch scanning signals St ₂ -St _n of the first sensing electrodes Tx ₂ -Tx _n in the state are all high potentials. In addition, during the T1 scanning period, the second sensing electrode Rx ₁ receives the touch sensing signal Sr ₁₁ .

Next, in the second scanning period T2, the first sensing electrode Tx ₂ is in the scanning state, the touch scanning signal St ₂ supplied to the first sensing electrode Tx ₂ is a low potential, and at the same time, the touch scanning signal St 2 supplied to the first sensing electrode Tx 2 that is not in the scanning state The touch scanning signals St ₁ , St ₃ -St _n of the first sensing electrode Tx ₁ , Tx ₃ -Tx _n are all at high potential, and correspondingly, the second sensing electrode Rx ₁ receives the touch sensing signal Sr ₁₂ . By analogy, in the n th scanning period Tn, the touch scanning signal St _n with a low potential is provided to the n th first sensing electrode Tx _n . During the T2 scanning period, the second sensing electrode Rx ₁ receives the touch sensing signal Sr ₁₂ .

In the first scanning period T1, according to the equivalent circuit diagram in FIG. 2 , since the touch scanning signal St ₁ input to the first sensing electrode Tx ₁ is at a low potential at this time, the touch scanning signal St ₁ will not affect The magnitude _of the mutual inductance capacitance C21 formed by the _first sensing electrode Tx1 and the second sensing electrode Rx1. At the same time, the touch scanning signals St ₂ -St _m are all high potentials, so these touch scanning signals St ₂ -St _n will affect the sensing of the first sensing electrodes Tx ₂ -Tx _n and receiving sensing. The size of the mutual capacitance C22-C2n formed by the electrodes Rx1, thus, the touch sensing signal received by the second sensing electrode Rx1 changes to Sr0', and the touch sensing signal _Sr11 can be expressed as _Sr0 '+N. Wherein, N is the noise signal added to the touch sensing signal Sr1 during the _first scanning period T1 due to the interference generated by electronic components and connections in the internal circuit of the touch sensing device 10 .

For the convenience of subsequent comparison and description, the noise signal N introduced by each time period T1 ˜Tn is the same within one frame scanning time when the driving circuit 12 scans the first sensing electrodes Tx ₂ -Tx _n .

In the second scanning period T2, since the touch scanning signal St ₁ applied to the first sensing electrode Tx ₁ is at a high potential at this time, the touch operation makes the touch operation on the first sensing electrode Tx ₁ and the second sensing electrode Rx ₁ The mutual inductance capacitance C21 changes, so that the touch sensing signal Sr ₂ output from Rx ₁ changes compared with the touch sensing signal Sr0' when no touch operation is received, and the amount of change is expressed as ΔS. Therefore, Sr ₁₂ It can be expressed as Sr0'+ΔS+N.

By analogy, similarly, in the subsequent third to nth scanning periods T3-Tn, the touch sensing signals received by the second sensing electrode Rx1 are respectively Sr ₁₃ =Sr ₁₄ . . . =Sr _1n =Sr0'+ ΔS+N.

During T1-Tn one-frame scanning time, the sum of the signals received by the second sensing electrode Rx ₁ S _sum 1=Sr ₁ +Sr ₂ +Sr ₃ +Sr ₄ +...+Sr _n =Sr0'+N+(n- 1) (Sr0'+ΔS+N)=nSr0'+(n-1)ΔS+nN.

Further, the signal change Sf1 actually obtained by the second sensing electrode Rx ₁ during the T1-Tn time period is calculated according to the sum of signals S _sum 1 received by the second sensing electrode Rx ₁ during the scanning period T1-Tn time period, the specific calculation method as follows:

S _sum 1/(n-1)=nSr0'/(n-1)+ΔS+nN/(n-1)

Sf1=S _sum 1/(n-1)-(Sr0'+N)=nSr0'/(n-1)+ΔS+nN/(n-1)-(Sr0'+N)=Sr0'/(n -1)+ΔS+N/(n-1)

At this time, the signal-to-noise ratio SNR in the actually obtained changed touch sensing signal Sf1 received by the second sensing electrode Rx ₁ is expressed as 20log((n−1)ΔS/N).

If a high-potential touch scanning signal is used to scan the first sensing electrodes Tx ₁ -Tx _n to activate the corresponding first sensing electrodes 11, according to the equivalent circuit diagram shown in FIG. 2 , the second sensing electrodes Rx ₁ actually The obtained signal change Sf0 is Sr0'+ΔS+N. It can be seen that compared with the high-potential scanning driving method, the signal-to-noise ratio 20log((n-1)ΔS/N) of the touch sensing signal Sf1 is ( n-1) times, since n is a natural number greater than 1, it can be seen that the signal-to-noise ratio (SNR) in the first embodiment of the present invention is improved by (n-1) times compared with the prior art, and the touch sensing signal is enhanced. The amount of signal change reduces the influence of environmental noise on the touch sensing signal, and improves the accuracy of touch position determination.

Preferably, a delay time T _delay can be inserted between two adjacent scanning periods Ti and Ti+1, and the delay time T _delay can be adjusted according to the size of the driving load, that is, when the driving load is large, The delay time T _delay can be extended accordingly, and when the driving load is small, the delay time T _delay can be shortened accordingly. At the same time, during the delay time, the touch scanning signals St ₁ -St _n provided by the drive circuit 12 are all at low potential.

Please refer to FIG. 4, which is a timing diagram of the second embodiment of the touch scanning signals St ₁ -St _n provided by the drive circuit 12, which is basically the same as the timing diagram in the first embodiment, the difference is that the non-sequential will be low The potential touch scan signal is provided to the plurality of first sensing electrodes 11 , for example, the low potential touch scan signal St _i is provided to the first sensing electrode Tx _j during the T _i time period. Wherein, both i and j are natural numbers, and 1≦j≦n, and i and j may be different.

Specifically, as shown in FIG. 4 , in the first scanning period T1, the first sensing electrode Tx ₁ is in the state of being scanned, providing a low-potential touch scanning signal St ₁ to the first sensing electrode Tx ₁ , and simultaneously providing The high-potential touch scanning signals St ₂ -St _n are sent to the remaining first sensing electrodes Tx ₂ -Tx _n that are not in the scanning state.

In the second scanning period T2, the first sensing electrode Tx ₃ is in a scanning state, providing a low-potential touch scanning signal St ₃ to the first sensing electrode Tx ₃ , and simultaneously providing a high-potential touch scanning signal St ₁ -St ₂ and St ₄ -St _n to the first sensing electrodes Tx ₁ -Tx ₂ and Tx ₄ -Tx _n not in the scanning state.

In the third scanning period T3, the first sensing electrode Tx ₅ is in a scanning state, providing a low-potential touch scanning signal St ₅ to the first sensing electrode Tx ₅ , and simultaneously providing a high-potential touch scanning signal St ₁ -St ₄ and St ₆ -St _n to the first sensing electrodes Tx ₁ -Tx ₄ and Tx ₆ -Tx _n not in the scanning state.

By analogy, the scanning drive of one frame scanning time is completed.

Please refer to FIG. 5, which is the timing diagram of the third embodiment of the touch scanning signals St ₁ -St _n provided by the driving circuit 12, which is basically the same as the timing diagram in the first embodiment. In the scanning period Ti, a low-potential touch scanning signal is provided to the two first sensing electrodes 11 . In this embodiment, the low-potential touch scanning signal is sequentially provided to two adjacent first sensing electrodes 11. It can be understood that during the scanning period Tn, the last one and the first first sensing electrode 11 11 is provided with a low-potential touch scanning signal. In the present invention, the last first sensing electrode Tx _n is adjacent to the first first sensing electrode Tx ₁ . It can be seen that such a driving method makes the touch scanning signals St ₁ -St _n of two adjacent first sensing electrodes Tx ₁ -Tx _n partially overlap in timing. In this embodiment, the length of the overlapping time is preferably the length of one scanning period T.

Specifically, as shown in Figure 5:

In the first scanning period T1, the first sensing electrodes Tx ₁ and Tx ₂ are in the scanning state, providing low potential touch scanning signals St ₁ , St ₂ to the first sensing electrodes Tx ₁ , Tx ₂ , providing high potential touch scanning signals St 1 , St 2 to the first sensing electrodes Tx 1 , Tx 2 The touch scanning signals St ₃ -St _n are sent to the first sensing electrodes Tx ₃ -Tx _n not in the scanning state.

In the second scanning period T2, the first sensing electrodes Tx ₂ and Tx ₃ are in the scanning state, providing low potential touch scanning signals St ₂ , St ₃ to the first sensing electrodes Tx ₂ , Tx ₃ , providing high potential touch scanning signals St 2 , St 3 to the first sensing electrodes Tx 2 , Tx 3 The touch scan signals St ₁ and St ₄ -St _n are sent to the unscanned first sensing electrodes Tx ₁ and Tx ₄ -Tx _n .

In the third scanning period T3, the first sensing electrodes Tx3 and Tx4 are in the scanning state, and provide low potential touch scanning signals St ₃ , St ₄ to the first sensing electrodes Tx ₃ , Tx ₄ , and simultaneously output high potential touch scanning signals St 3 , St 4 to the first sensing electrodes Tx 3 , Tx 4 . The touch scanning signals St ₁ -St ₂ and St ₅ -St _n are sent to the first sensing electrodes Tx ₁ -Tx ₂ and Tx ₅ -Tx _n which are not in the scanning state.

And so on, until the scanning drive of one frame scanning time is completed.

At this time, in the time period T1-Tn, the sum of the signals received by the second sensing electrode Rx ₁ S _sum 1=Sr ₁ +Sr ₂ +Sr ₃ +Sr ₄ +...+Sr _n =2(Sr0'+N )+(n-1)(Sr0'+ΔS+N)=nSr0'+(n-2)ΔS+nN.

Further, the signal variation Sf1 actually obtained by the second sensing electrode Rx ₁ is calculated according to the sum S _sum 1 of signals received by the second sensing electrode Rx ₁ in the time period T1-Tn, and the specific calculation method is as follows:

S _sum 1/(n-2)=nSr0'/(n-2)+ΔS+nN/(n-2);

Sf1=S _sum 1/(n-2)-(Sr0'+N)=nSr0'/(n-2)+ΔS+nN/(n-2)-(Sr0'+N)=2Sr0'/(n -2)+ΔS+(n-2)N/2

At this time, the signal-to-noise ratio SNR in the signal variation Sf1 actually received by the second sensing electrode Rx1 is expressed as 20log((n−2)ΔS/(2N)).

Therefore, when a number of first sensing electrodes 11 are selected for driving at the same time, a is preferably a natural number smaller than n/2, and the signal-to-noise ratio SNR can be expressed as 20log((n-a)ΔS/(aN)). It can be seen that the signal-to-noise ratio SNR is also increased by (n-a)/a times compared with the high-potential scanning mode at this time.

Please refer to FIG. 6, which is a timing diagram of the fourth embodiment of the touch scanning signal St ₁ -St _n provided by the driving circuit 12, which is basically the same as the timing diagram in the third embodiment. In each frame scanning time, in Any scan period Ti provides two low-potential touch scan signals to the first sensing electrodes 11 at two adjacent positions, and the non-sequential first sensing electrodes Tx ₁ -Tx _n also That is, if two low-potential scanning signals St _j and St _(j+1) are provided to the first sensing electrodes Tx _j and Tx _(j+1) in the i-th scanning period Ti, the i+1-th In the scanning period T(i+1), low potential scanning signals St _(j+1) and St _(j+2) are not provided to the first sensing electrodes Tx _(j+1) and Tx _(j+2) , nor provide low-potential scan signals St _(j+1) and St _(j-1) to the first sensing electrodes Tx _(j+1) and Tx _(j-1) , so that the plurality of first sensing electrodes The touch scan signals St ₁ -St _n of at least two first sensing electrodes Tx ₁ -Tx _n among the measuring electrodes Tx ₁ -Tx _n are partially overlapped in timing, and the overlapping time length is preferably 1 scanning period. time.

Specifically, in the first scanning period T1, the first sensing electrodes Tx ₁ and Tx ₂ are in the scanning state, providing low potential touch scanning signals St ₁ , St ₂ to the first sensing electrodes Tx ₁ , Tx ₂ , providing The high-potential touch scan signals St ₃ -St _n are sent to the first sensing electrodes Tx ₃ -Tx _n that are not in the scan state.

In the second scanning period T2, the first sensing electrodes Tx ₃ and Tx ₄ are in the scanning state, and provide low potential touch scanning signals St ₃ , St ₄ to the first sensing electrodes Tx ₃ , Tx ₄ , and provide high potential at the same time. The potential touch scanning signals St ₁ -St ₂ and St ₅ -St _n are sent to the first sensing electrodes Tx ₁ -Tx ₂ and Tx ₅ -Tx _n which are not in the scanning state.

In the third scanning period T3, the first sensing electrodes Tx ₁ and Tx _n are in the scanning state, and output low potential St ₁ , St _n to the first sensing electrodes Tx ₁ , Tx _n in the scanning state, and output high potential at the same time. Potential St ₂ -St _(n−1) to the first sensing electrodes Tx ₂ -Tx _n not in the scanning state.

By analogy, scan to the nth scan period Tn until the scan time of one frame is completed.

Please refer to FIG. 1 and FIG. 7 together, which is a timing diagram of a fifth embodiment of a plurality of touch scanning signals St ₁ -St _n provided by the drive circuit 12 within one frame scanning time. One scanning period Ti, providing two low-potential touch scanning signals to the first sensing electrodes 11 at two non-adjacent positions, and scanning the plurality of first sensing electrodes Tx1-Txn in a sequential or non-sequential manner , that is, for any scanning period Ti, the first sensing electrode Txj and the first sensing electrodes 11 except Tx(j−1) and Tx(j+1) are in a scanning state.

Specifically, as shown in Figure 7:

In the first scanning period T1, the first sensing electrodes Tx ₁ and Tx ₄ are in the scanning state, and provide low potential touch scanning signals St ₁ , St ₄ to the first sensing electrodes Tx ₁ , Tx ₄ , and simultaneously provide high potential The potential touch scanning signals St ₂ -St ₃ and St ₅ -St _n are sent to the first sensing electrodes Tx ₂ -Tx3 and Tx ₅ -Tx _n which are not in the scanning state.

In the second scanning period T2, the first sensing electrodes Tx ₂ and Tx _n are in the scanning state, and provide low potential touch scanning signals St ₂ , St _n to the first sensing electrodes Tx ₂ , Tx _n while outputting high The potential touch scanning signals St ₁ and St ₃ -St _(n-1) are sent to the first sensing electrodes Tx ₁ and Tx ₃ -Tx _(n-1) which are not in the scanning state.

In the third scanning period T3, the first sensing electrodes Tx ₁ and Tx ₃ are in the scanning state, and provide low potential touch scanning signals St ₁ , St ₃ to the first sensing electrodes Tx ₁ , Tx ₃ , and simultaneously provide high potential The potential touch scanning signals St ₂ and St ₄ -St _n are sent to the first sensing electrodes Tx ₂ and Tx ₄ -Tx _n which are not in the scanning state.

By analogy, till the nth scanning period, the scanning driving of one frame scanning time is completed.

FIG. 8 is a flow chart of the driving method of the touch sensing device 10 according to the present invention. The driving method of the touch sensing device 10 can be obtained according to the timing diagram of the driving signal provided by the driving circuit 12 in the above five examples. The driving method includes the steps of:

Step S101 , in each scanning period T, simultaneously provide a plurality of touch scanning signals St ₁ -St _n to the plurality of first sensing electrodes Tx ₁ -Tx _n .

Step S102, providing low-potential touch scanning signals St ₁ -St _n to the corresponding first sensing electrodes 11 to indicate that the corresponding first sensing electrodes are in a scanned state; providing high-potential touch scanning signals St ₁ -St _n are given to the rest of the first sensing electrodes 11 to indicate that the rest of the first sensing electrodes 11 are in an unscanned state.

Preferably, in any scanning period T within the scanning time of each frame, a first sensing electrode Tx ₁ -Tx _{n is} selected, and a corresponding potential touch scanning signal St ₁ -St _n is output to the first sensing electrode Tx ₁ -Tx _n .

More preferably, one first sensing electrode Tx _{1 -Tx n is sequentially scanned according to the arrangement sequence of the plurality of first sensing electrodes Tx 1 -Tx n .}

Preferably, in each scanning period, the low-potential touch scanning signal is only provided to a first sensing electrodes, wherein a is preferably a natural number less than n/2, and n is the first sensing electrode The total number of , n is a natural number greater than 1.

More preferably, the low potential touch scan signal is sequentially provided to the a first sensing electrodes according to the arrangement order of the plurality of first sensing electrodes Tx ₁ -Tx _n .

More preferably, the touch scan signals St ₁ -St _n of the plurality of first sensing electrodes Tx ₁ -Tx _n partially overlap in timing.

More preferably, the time length in which the touch scanning signals St ₁ -St _n of the plurality of first sensing electrodes Tx ₁ -Tx _n partially overlap in timing is equal to the duration T of one scanning period.

More preferably, the touch scanning signals St ₁ -St _n of two adjacent first sensing electrodes Tx ₁ -Tx _n partially overlap in timing.

More preferably, the a first sensing electrodes Tx ₁ -Tx _n are not adjacent in position.

Claims (9)

1. the driving method of a touch sensing device, this touch sensing device comprises multiple the first sensing electrode along first party to arrangement, multiple along second direction arrangement and two sensing electrode crossing with the plurality of first sensing electrode electrical isolation, the touch scanning signals that the plurality of 2nd sensing electrode is carried on the plurality of first sensing electrode for responding exports multiple touch-control sensing signal, wherein, the minimum duration that the plurality of touch scanning signals is carried on the plurality of first sensing electrode is defined as the one scan period, and this driving method comprises:

In each scanning period, load multiple touch scanning signals to the plurality of first sensing electrode simultaneously, to corresponding first sensing electrode, to characterize, this corresponding first sensing electrode is in the state scanned to the touch scanning signals of offer low potential, it is provided that the touch scanning signals of noble potential gives remaining first sensing electrode, and to characterize, this remaining first sensing electrode is in the state not scanned;

Between the adjacent scanning period, insert a delay period, provide the touch scanning signals of low potential to corresponding first sensing electrode within this delay period.

2. the driving method of touch sensing device as claimed in claim 1, it is characterised in that, each scanning duration period is all identical.

3. the driving method of touch sensing device as described in claim 1 to 2 any one, it is characterized in that, in each scanning period, the touch scanning signals of low potential is only provided to a the first sensing electrode, wherein, a gets the natural number being less than n/2, and n is the sum of this first sensing electrode, n be greater than 1 natural number.

4. the driving method of touch sensing device as claimed in claim 3, it is characterized in that, in the frame scan time, another group a the first sensing electrode of one group of a the first sensing electrode being provided the touch scanning signals of low potential in the front one scan period and the touch scanning signals being provided low potential in the rear one scan period arranges according to the plurality of putting in order of first sensing electrode.

5. the driving method of touch sensing device as claimed in claim 4, it is characterised in that, the touch scanning signals of the plurality of first sensing electrode is overlapping in sequential upper part.

6. the driving method of touch sensing device as claimed in claim 5, it is characterised in that, the touch scanning signals of the plurality of first sensing electrode equals, in the time span of sequential upper part overlap, the time length that 1 scans the period.

7. the driving method of touch sensing device as claimed in claim 5, it is characterised in that, the touch scanning signals of adjacent two the first sensing electrodes is overlapping in sequential upper part.

8. the driving method of touch sensing device as claimed in claim 3, it is characterised in that, this the first sensing electrode is not adjacent in position.

9. a touch sensing device, comprise: multiple the first sensing electrode along first party to arrangement, multiple along second direction arrangement and two sensing electrode crossing with the plurality of first sensing electrode electrical isolation, the touch scanning signals that the plurality of 2nd sensing electrode is carried on the plurality of first sensing electrode for responding exports multiple touch-control sensing signal, wherein, the minimum duration that the plurality of touch scanning signals is carried on the plurality of first sensing electrode is defined as the one scan period, it is characterized in that, in each scanning period, load multiple touch scanning signals to the plurality of first sensing electrode simultaneously, to corresponding first sensing electrode, to characterize, this corresponding first sensing electrode is in the state scanned to the touch scanning signals of offer low potential, this remaining first sensing electrode is in the state not scanned to characterize to provide the touch scanning signals of noble potential to give remaining first sensing electrode, between the adjacent scanning period, insert a delay period, provide the touch scanning signals of low potential to corresponding first sensing electrode within this delay period.