CN103324338B - Touch device and driving method thereof - Google Patents

Abstract

The invention provides a touch device and a driving method thereof. The touch device comprises a plurality of driving electrodes, a plurality of sensing electrodes, a driving circuit and a sensing circuit. The sensing electrodes and the driving electrodes define a plurality of sensing points together. The driving circuit is connected with the plurality of driving electrodes, provides a plurality of driving signals for the plurality of driving electrodes, and drives the plurality of driving electrodes in a circulating manner. The sensing circuit is connected with the sensing electrodes, receives sensing signals output by the sensing electrodes, and analyzes and obtains the positions of the sensed points of the touch device according to the sensing signals. In one cycle of the driving circuit driving the plurality of driving electrodes, the driving circuit provides the same duration of the driving signals for the driving electrodes, and the driving signals loaded on at least two driving electrodes are partially overlapped. The touch device has high sensing sensitivity.

Description

Touch device and driving method thereof

technical field

The invention relates to a touch technology, in particular to a touch device and a driving method of the touch device.

Background technique

For a touch device, sensing sensitivity is an important index to measure the quality of the touch device. However, the sensing sensitivity of current touch devices is relatively low. Correspondingly, how to improve touch sensitivity has become one of the important research topics in the touch field.

Contents of the invention

In order to solve the technical problem of low sensitivity of the prior art touch device, it is necessary to provide a touch device with high sensitivity.

In order to solve the technical problem of low sensitivity of the prior art touch device, it is necessary to provide a driving method of the touch device with high sensitivity.

A touch device includes a plurality of driving electrodes, a plurality of sensing electrodes, a driving circuit and a sensing circuit. The plurality of sensing electrodes and the plurality of driving electrodes jointly define a plurality of sensing points. The drive circuit is connected to the multiple drive electrodes, the drive circuit provides multiple drive signals to the multiple drive electrodes, and the drive circuit cyclically drives the multiple drive electrodes. The sensing circuit is connected to the plurality of sensing electrodes, the sensing circuit receives the sensing signals output by the plurality of sensing electrodes, and obtains the sensing point where the touch device is touched according to the sensing signal analysis s position. In one cycle of driving the plurality of driving electrodes by the driving circuit, the duration of the driving signal provided by the driving circuit to each driving electrode is the same, and the driving signals loaded on at least two driving electrodes are partially overlapped.

A driving method of a touch device, the touch device includes a plurality of driving electrodes and a plurality of sensing electrodes, the plurality of sensing electrodes and the plurality of driving electrodes jointly define a plurality of sensing points, the driving method includes:

cyclically providing a plurality of driving signals to the plurality of driving electrodes;

receiving sensing signals output by the plurality of sensing electrodes; and

Analyzing the sensing signals output by the plurality of sensing electrodes to obtain the position of the touched sensing point of the touch device;

In a cycle of supplying the driving signals to the plurality of driving electrodes, the duration of the driving signals provided to each driving electrode is the same, and the driving signals provided to at least two driving electrodes partially overlap.

Compared with the prior art, since the driving signals S _t1 to S _tn provided by the touch device and the driving method to the driving electrodes D ₁ to D _n partially overlap sequentially, the touch device can drive all The time required to drive the electrodes D ₁ -D _n is shortened, thereby improving the sensing sensitivity of the touch device.

Description of drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of the touch device of the present invention.

FIG. 2 is a waveform diagram of a first embodiment of a driving signal provided by a driving circuit of the touch device shown in FIG. 1 .

FIG. 3 is a waveform diagram of part of the sensing signals received by the sensing circuit of the touch device shown in FIG. 1 .

FIG. 4 is a flowchart of a driving method of the touch device shown in FIG. 1 .

FIG. 5 is a waveform diagram of a second embodiment of the driving signal provided by the driving circuit of the touch device shown in FIG. 1 .

FIG. 6 is a waveform diagram of a third embodiment of the driving signal provided by the driving circuit of the touch device shown in FIG. 1 .

FIG. 7 is a waveform diagram of a fourth embodiment of a driving signal provided by the driving circuit of the touch device shown in FIG. 1 .

Description of main component symbols

Touch Device 1 Touch Panel 10

Drive circuit 12 Sensing circuit 14

Sensing point 105 Driving electrodes D ₁ -D _n

Sensing electrodes G ₁ ～G _m sensing signals S _r1 ～S _rm

Driving signal S _t1 ～S _tn

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 . FIG. 1 is a schematic structural diagram of a preferred embodiment of the touch device of the present invention. In this embodiment, a mutual capacitive touch device is taken as an example for illustration, and the present invention can also be applied to other suitable types of touch devices. The touch device 1 includes a touch panel 10 , a driving circuit 12 and a sensing circuit 14 . The touch panel 10 includes a plurality of driving electrodes D ₁ -D _n and a plurality of sensing electrodes G ₁ -G _m , wherein m and n are both positive integers. The plurality of sensing electrodes G ₁ -G _m are insulated and intersected with the plurality of driving electrodes D ₁ -D _n to define a plurality of sensing points 105 . The driving circuit 12 is electrically connected to the plurality of driving electrodes D ₁ -D _n . The sensing circuit 14 is electrically connected to the plurality of sensing electrodes G ₁ -G _m . It can be understood that the driving circuit 12 and the sensing circuit 14 can be integrated into the same circuit module or chip.

The driving circuit 12 provides a plurality of driving signals S _t1 -S _tn to the plurality of driving electrodes D ₁ -D _n , and the driving circuit cyclically drives the plurality of driving electrodes D ₁ -D _n . In the present invention, a cycle is defined when all the driving electrodes D ₁ -D _n are scanned once. In one cycle in which the driving circuit 12 drives the plurality of driving electrodes D ₁ -D _n , the duration of the driving signals S _t1 -S _tn provided by the driving circuit 12 to each of the driving electrodes D ₁ -D _n is the same, and The driving signals loaded on at least two driving electrodes D ₁ -D _n are partially overlapped. The sensing circuit 14 receives the sensing signals S _r1 -S _rm output by the plurality of sensing electrodes G ₁ -G _m , and analyzes the sensing signals S _r1 -S _rm to obtain that the touch device 1 is touched. The position of the sensing point 105.

Please refer to FIG. 2 , which is a waveform diagram of a first embodiment of the driving signals S _t1 -S _tn provided by the driving circuit 12 . In Fig. 2, T ₁ =T ₂ =T ₃ =...=T _2n+1 =T/2, where T is the driving signal S _t1 ~ S _tn applied to the corresponding driving electrode D in each cycle ₁ to the total duration of _Dn . In this embodiment, the total durations of the driving signals S _t1 -S _tn being applied to the corresponding driving electrodes D ₁ -D _n are equal. Correspondingly, the duration of the driving signal S _t1 is T=T ₁ +T ₂ , the duration of the driving signal S _t2 is T=T ₂ +T ₃ , and so on for other driving signals. In addition, in FIG. 2, the first cycle of driving the plurality of driving electrodes D ₁ -D _n for the driving circuit 12 is completed from T ₁ to T _n+1 , and from T _n+1 to T _2n+1 The end is the second cycle of driving the plurality of driving electrodes D ₁ -D _n by the driving circuit 12 , and so on.

Specifically, in this embodiment, the drive circuit 12 successively provides the n drive signals S _t1 -S _tn to the n drive electrodes D ₁ -D _n , and the n drive signals S _t1 -S _tn partially overlap in sequence , and the last driving signal S _tn of the current cycle partially overlaps with the first driving signal S _t1 of the next cycle. Preferably, the waveform of the first half of each driving signal overlaps the waveform of the second half of the previous driving signal, and the waveform of the second half overlaps the waveform of the first half of the next driving signal. In addition, in this embodiment, each of the driving signals S _t1 -S _tn is a square wave with the same pulse width.

Please refer to FIG. 3 , which is a waveform diagram of part of the sensing signal received by the sensing circuit 14 . Wherein, waveform a in FIG. 3 is the waveform _{diagram of the sensing signal S r1 output} by the sensing electrode G1 correspondingly received by the sensing circuit 14 when the touch panel 10 is not touched; waveform b is the When the sensing point 105 defined by the driving electrode D1 and the sensing electrode _{G1 on} the touch panel 10 is touched, the sensing circuit 14 correspondingly receives the sensing signal output by the sensing electrode _G1 . The waveform diagram of the detection signal S _r1 ; the waveform c is when the sensing point 105 defined by the driving electrode D2 and the sensing electrode _{G1 on} the touch panel 10 is touched, the sensing circuit 14 correspondingly receives The waveform diagram of the sensing signal S _r1 output by the sensing electrode _G1 ; the waveform d is corresponding to the sensing point 105 defined by the driving electrode D1 and the sensing electrode _{G1 on} the touch panel 10 , and when both the sensing point 105 defined by the driving electrode D2 and the sensing electrode _G1 are touched simultaneously, the sensing circuit ₁₄ correspondingly receives the sensing signal output by the sensing electrode _G1 Waveform diagram of signal S _r1 . In this embodiment, only the driving electrodes D ₁ , D ₂ and the sensing electrode G ₁ are taken as examples for illustration, and the principle of the sensing point 105 being touched at other positions is similar, and will not be repeated here. Referring to waveforms a, b, c, d, the working principle of the touch device 1 is as follows:

When the touch panel 10 is not touched, the amplitudes of the sensing signals S _r1 output by the sensing electrodes G ₁ received by the sensing circuit 14 are all the same.

When the sensing point 105 defined by the driving electrode D ₁ and the sensing electrode G ₁ is touched during the time period T ₁ -T ₂ , since the object touching the sensing point 105 takes away part of the charge, therefore The amplitude of the sensing signal S _r1 output by the sensing electrode G ₁ decreases by x during the time period T ₁ -T ₂ , so that the sensing circuit 14 learns from the sensing signal S _r1 that the driving electrode D ₁ and The sensing point 105 defined by the sensing electrode _G1 is touched.

When the sensing point 105 defined by the driving electrode D ₂ and the sensing electrode G ₁ is touched during the time period T ₂ -T ₃ , since the object touching the sensing point 105 takes away part of the charge, therefore , the amplitude of the sensing signal S _r1 output by the sensing electrode G ₁ decreases by x during the time period T ₂ -T ₃ , thus, the sensing circuit 14 knows from the sensing signal S _r1 that the drive electrode D ₂ and The sensing point 105 defined by the sensing electrode _G1 is touched.

When the sensing point 105 defined by the driving electrode D ₁ and the sensing electrode G ₁ and the sensing point 105 defined by the driving electrode D ₂ and the sensing electrode G ₁ are within the time period T ₁ -T ₃ When touched at the same time, because the object touching the sensing point 105 takes away part of the charge, the amplitude of the sensing signal S _r1 output by the sensing electrode _G1 decreases by _x in the time period T1, and in the time period _The period T2 decreases by _2x , and the period T3 decreases by x, so that the sensing circuit ₁₄ knows the sensing point 105 defined by the driving electrode D1 and the sensing electrode _G1 according to the sensing signal _Sr1 , And the sensing point 105 defined by the driving electrode D ₂ and the sensing electrode G ₁ is touched simultaneously during the time period T ₁ -T ₃ .

Since the drive circuit 12 of the touch device 1 outputs the drive signals S _t1 to S _tn to the respective drive electrodes D ₁ to D _n partially overlap sequentially, the drive circuit 12 drives all the drive electrodes D ₁ to D _n each time. The required time is shortened, thereby improving the sensitivity of the touch device 1 .

Please refer to FIG. 4 , which is a flow chart of the driving method of the touch device 1 . The drive method includes:

Step S1: cyclically provide multiple driving signals S _t1 -S _tn to the multiple driving electrodes D ₁ -D _n , wherein, after providing the driving signals S _t1 -S _tn to one of the multiple driving electrodes D ₁ -D _n In a cycle, the duration of the driving signals S _t1 -S _tn provided to each of the driving electrodes D ₁ -D _n is the same, and the driving signals provided to at least two driving electrodes partially overlap.

Preferably, in each cycle, the drive signals S _t1 -S _tn are sequentially provided to the multiple drive electrodes D ₁ -D _n , wherein the multiple drive signals S provided to the multiple drive electrodes D ₁ -D _{n t1} to S _tn partially overlap sequentially, and the last driving signal S _tn of the current cycle partially overlaps S _t1 with the first driving signal of the next cycle.

More preferably, the waveform of the first half of each driving signal overlaps the waveform of the second half of the previous driving signal, and the waveform of the second half overlaps the waveform of the second half of the next driving signal.

Step S2: receiving sensing signals S _r1 -S _rm output by the plurality of sensing electrodes G ₁ -G _m ; and

Step S3: Analyze and obtain the position of the touched sensing point 105 of the touch device 1 according to the sensing signals S _r1 -S _rm outputted from the sensing electrodes G ₁ -G _m .

The present invention is not limited to the above embodiments. For example, please refer to FIG. 5 , which is a waveform diagram of a second embodiment of the driving signals S _t1 -S _tn provided by the driving circuit 12 . Each of the driving signals S _t1 -S _tn is a plurality of square waves that change periodically and have the same pulse width. For clarity and brevity, only the waveforms of the driving signals S _t1 and S _t2 are shown in FIG. 5 , and the waveforms of other driving signals can be analogized.

In other modified implementation manners, please refer to FIG. 6 for details. FIG. 6 is a waveform diagram of a third embodiment of the driving signals S _t1 -S _tn provided by the driving circuit 12 . At least three driving signals (see driving signals S _t1 -S _t3 ) partially overlap. It is defined that the driving signals S _t1 -S _t3 applied to the driving electrodes D ₁ -D ₃ by the driving circuit 12 are respectively the first driving signal S _t1 , the second driving signal S _t2 , and the third driving signal S _t3 . Both the second driving signal S _t2 and the third driving signal S _t3 partially overlap with the first driving signal S _t1 . The third driving signal S _t3 partially overlaps with the second driving signal S _t2 . The present invention is not limited to partial overlapping of three driving signals, and in other modified implementations, four or even n driving signals may be partially overlapping.

Please refer to FIG. 7 , which is a waveform diagram of a fourth embodiment of the driving signals S _t1 -S _tn provided by the driving circuit 12 . The driving signals S _t1 -S _tn of the fourth embodiment are similar to the driving signals S _t1 -S _tn of the third embodiment, and the main difference between them is that the third driving signal S _t3 and the second driving signal S _t2 fully overlapped. In addition, the fourth driving signal S _t4 may or may not overlap with the third driving signal S _t3 . In this embodiment, the driving signal S _t4 does not overlap with the third driving signal S _t3 .

Further, in other modified embodiments, in one cycle or each cycle, the total duration of the driving signals S _t1 -S _tn applied to the driving electrodes D ₁ -D _n by the driving electrode 12 may also be different or Some are different.

Claims (5)

1. a kind of contactor control device, it includes：

Multiple driving electrodes；

Multiple sensing electrodes, the plurality of sensing electrode multiple sensing points with the plurality of driving electrodes common definition；

Drive circuit, this drive circuit is connected with the plurality of driving electrodes, and this drive circuit provides multiple drive signals many to this Individual driving electrodes, the circulation of this drive circuit drives the plurality of driving electrodes；

Sensing circuit, this sensing circuit is connected with the plurality of sensing electrode, and this sensing circuit receives defeated by the plurality of sensing electrode The sensing signal going out, and this contactor control device of acquisition is analyzed by the position of the sensing points of touch-control according to this sensing signal；

It is characterized in that：In the circulation that this drive circuit drives the plurality of driving electrodes, this drive circuit is supplied to The duration of the drive signal of each driving electrodes is identical；

The quantity of the plurality of driving electrodes is n, and wherein, n is the natural number more than 3, and this drive circuit provides driving letter successively Number give this n driving electrodes, define this drive circuit priority and be supplied to the drive signal respectively first of this n driving electrodes and drive Dynamic signal, the second drive signal ... and N drive signal, wherein, the N quantity to be represented with n is identical, each drives letter Number first half waveform overlapping with the latter half waveform of a upper drive signal, and latter half waveform and next drive signal First half waveform overlapping, and the N drive signal of previous cycle partly overlapped with the first drive signal of subsequent cycle.

2. a kind of contactor control device, it includes：

Multiple driving electrodes；

Multiple sensing electrodes, the plurality of sensing electrode multiple sensing points with the plurality of driving electrodes common definition；

Drive circuit, this drive circuit is connected with the plurality of driving electrodes, and this drive circuit provides multiple drive signals many to this Individual driving electrodes, the circulation of this drive circuit drives the plurality of driving electrodes；

Sensing circuit, this sensing circuit is connected with the plurality of sensing electrode, and this sensing circuit receives defeated by the plurality of sensing electrode The sensing signal going out, and this contactor control device of acquisition is analyzed by the position of the sensing points of touch-control according to this sensing signal；

It is characterized in that：In the circulation that this drive circuit drives the plurality of driving electrodes, this drive circuit is supplied to The duration of the drive signal of each driving electrodes is identical；

This drive circuit provides drive signal successively to three driving electrodes, defines this drive circuit priority and is supplied to this three drivings electricity The drive signal of pole respectively is the first drive signal, the second drive signal and the 3rd drive signal；

The first half waveform of this second drive signal is overlapping with the latter half waveform of this first drive signal, this second driving The latter half waveform of signal is overlapping with the first half waveform of the 3rd drive signal.

3. the contactor control device as described in claim 1-2 any one it is characterised in that：It is identical that each drive signal is pulsewidth A square wave.

4. the contactor control device as described in claim 1-2 any one it is characterised in that：Each drive signal is and periodically becomes Change and the multiple square wave of pulsewidth identical.

5. a kind of driving method of contactor control device, this contactor control device includes multiple driving electrodes and multiple sensing electrode, the plurality of Sensing electrode multiple sensing points with the plurality of driving electrodes common definition, this driving method includes：

Circulation provides multiple drive signals to the plurality of driving electrodes；

Receive the sensing signal being exported by the plurality of sensing electrode；And

This contactor control device is obtained by the position of the sensing points of touch-control according to the sensing signal analysis of the plurality of sensing electrode output；

It is characterized in that：There is provided drive signal in a circulation of the plurality of driving electrodes, be supplied to each driving electrodes The duration of drive signal is identical；

In each cycle, provide drive signal successively to the plurality of driving electrodes, wherein, the first half of each drive signal Waveform is overlapping with the latter half waveform of a upper drive signal, and the first half partial wave of latter half waveform and next drive signal Shape is overlapping, and last drive signal of previous cycle is partly overlapped with first drive signal of subsequent cycle.