CN203376726U - Capacitive touch screen - Google Patents

Abstract

The utility model discloses a capacitive touch screen. The capacitive touch screen comprises a substrate, a plurality of inducting electrodes which are arranged on the substrate and are arranged into a two-dimensional array, and a touch control chip bound to the substrate, the touch control chip is connected with each of the multiple inducting electrodes respectively through a wire and comprises a driving source, a detecting circuit and a time sequence control circuit, all the inducting electrodes are respectively connected with the driving source and the detecting circuit, the time sequence control circuit turns on or off the driving source according to a preset control scheme, the detecting circuit detects the capacitance changing quantity of all the inducting electrodes, and therefore the touch positions, on the touch screen, of touch bodies can be detected out. According to the capacitance changing rate of all the inducting electrodes, the capacitive touch screen can accurately detect the positions of a plurality of touch points which are touched at the same time on the touch screen.

Description

A kind of capacitive touch screen

Technical field

The utility model relates to the touch technology field, relates in particular to a kind of capacitive touch screen.

Background technology

Current, touch-screen is widely used in mobile phone, personal digital assistants (Personal Digital Assistant, PDA), GPS (Global Positioning System, GPS), in the various electronic products such as computer, TV, be penetrated into gradually the every field of people's work and life.But current touch-screen only can be supported the touch application of an active pen, while applying for many active pens, can not support simultaneously.

The utility model content

The utility model embodiment provides a kind of capacitive touch screen, can detect the position of a plurality of touch points simultaneously and can support branched active pen application.

The capacitive touch screen that the utility model embodiment provides comprises:

Substrate, be arranged at a plurality of induction electrodes on described substrate, and described a plurality of induction electrodes are arranged in two-dimensional array; And being tied to the touch control chip on described substrate, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes;

Described touch control chip comprises drive source, testing circuit and sequential control circuit, and described each induction electrode is connected with described testing circuit with described drive source respectively;

Described sequential control circuit starts according to preset control program or closes described drive source, and described testing circuit detects the capacitance change of described each induction electrode, thereby detects the touch location touched on the described touch-screen of body.

Preferably, when described sequential control circuit starts described drive source according to preset control program, described testing circuit detects the self-capacitance variable quantity of described each induction electrode, thereby detects the touch location of passive touch body on described touch-screen.

Preferably, when described sequential control circuit is closed described drive source according to preset control program, described testing circuit detects the mutual capacitance variable quantity of described each induction electrode, thereby detects the touch location of active touch body on described touch-screen.

Preferably, described sequential control circuit is controlled described drive source and described each induction electrode is started simultaneously or divide into groups and start, so that described testing circuit detects described each induction electrode or divides into groups simultaneously, detects.

Preferably, the electric signal that described testing circuit and described active touch body send is asynchronous.

Preferably, the electric signal that described testing circuit sends with described active touch body keeps synchronizeing.

Preferably, the synchronous code that described testing circuit sends according to active touch body is adjusted to the electric signal of described active touch body transmission and is synchronizeed.

Preferably, described testing circuit is adjusted the phase place of this testing circuit, when the electrical signal amplitude that makes described testing circuit receive is maximum, reaches the electric signal sent with described active touch body and synchronize and keep synchronous with the electric signal of described active touch body transmission under described phase place.

Preferably, the driving frequency of described each induction electrode has at least one.

Preferably, described a plurality of induction electrode belongs at least more than one induction electrode zone, the quantity of described touch-control chip is identical with the quantity in described induction electrode zone, and each touch control chip is connected by wire respectively with each induction electrode in induction electrode zone under its control.

Preferably, the clock synchronous of described each touch control chip or asynchronous.

Preferably, the shape of described induction electrode is at least one in rectangle, rhombus, circle, ellipse.

Preferably, described substrate is glass substrate, and described touch control chip is tied on substrate in glass flip chip (Chip-on-Glass) mode; Perhaps

Described substrate is flexible substrate, and described touch control chip covers crystalline substance (Chip-on-Film) mode with flexibility and is tied on substrate; Perhaps

Described substrate is printed circuit board, and described touch control chip is tied on substrate in the mode of chip on board encapsulation (Chip-on-Board).

According to the disclosed capacitive touch screen of the utility model embodiment, each induction electrode is separate, the touch control chip is connected by wire respectively with each induction electrode, the touch control chip can, according to the rate of change of capacitance of each induction electrode, accurately detect the position that simultaneously touches a plurality of touch points on touch-screen.Thereby overcome in the prior art and can not accurately carry out the problem of multiple spot detection.

The accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic diagram of the capacitive touch screen that provides of disclosure embodiment;

Fig. 2 is the vertical view according to the induction electrode array of disclosure embodiment;

Fig. 3 to Fig. 6 shows the induction electrode driving method according to disclosure embodiment;

Fig. 7 shows the signal synchronization scheme according to the utility model embodiment;

Fig. 8 shows many detection figure according to the utility model embodiment;

Fig. 9 shows the signal flow diagram according to the touch control chip of the utility model embodiment.

Embodiment

The utility model embodiment provides a kind of capacitive touch screen, can detect the position of a plurality of touch points simultaneously.

For purpose of the present disclosure, feature and advantage can more be become apparent, below in conjunction with the accompanying drawing in disclosure embodiment, the technical scheme of disclosure embodiment is described.Obviously, described embodiment is only a part of embodiment of the present utility model.Based on disclosure embodiment, any other embodiment that those skilled in the art obtain under the prerequisite of not paying creative work, should belong to protection domain of the present utility model.For ease of explanation, mean that the sectional view of structure is disobeyed general ratio and done local the amplification.And accompanying drawing is exemplary, it should not limit protection domain of the present utility model.The three-dimensional dimension that in actual fabrication, should comprise in addition, length, width and the degree of depth.

Fig. 1 is the structural representation of the capacitive touch screen that provides of the utility model embodiment.As shown in Figure 1, this capacitive touch screen 11 comprises: substrate 16; Be arranged at a plurality of induction electrodes 19 on substrate, described a plurality of induction electrodes 19 are arranged in two-dimensional array; And being tied to the touch control chip 10 on substrate 16, described touch control chip 10 is connected by wire respectively with each induction electrode 19.Touch control chip 10 comprises drive source, testing circuit and sequential control circuit (not drawing in Fig. 1), and each induction electrode 19 is connected with testing circuit with drive source respectively; Sequential control circuit starts or closes drive source according to preset control program, and testing circuit detects the capacitance change of each induction electrode 19, thereby detects the touch location touched on the described touch-screen of body.

Preset control program can first start driving power for starting and the order of closing driving power, also can first close driving power.

Substrate 16 can be transparent, is for example glass substrate or flexible substrate; Can be also opaque, be for example printed circuit board.Be provided with a plurality of induction electrodes 19 on substrate 16, described a plurality of induction electrodes 19 are arranged in two-dimensional array, can be the two-dimensional arraies of rectangular array or any other shape.For capacitive touch screen, each induction electrode 19 is capacitive transducers, and the electric capacity of capacitive transducer changes when on touch-screen, relevant position is touched.

Alternatively, be provided with overlayer (cover lens) with protection induction electrode 19 above induction electrode 19.

Each induction electrode 19 is wired to touch control chip 10, and touch control chip 10 is tied on substrate 16.Owing to being connected by wire respectively with each induction electrode 19, the pin of touch control chip 10 is a lot, therefore, touch control chip 10 is tied on substrate 16 to the difficulty that can avoid conventional encapsulation.Particularly, touch control chip 10 can pass through glass flip chip (Chip-on-Glass, be called for short COG) mode or flexibility is covered crystalline substance (Chip-on-Film is called for short COF) or chip on board encapsulation (Chip-on-Board is called for short COB) mode is tied on substrate.According to the present embodiment, can there is anisotropic conductive film (ACF) 17 between touch control chip 10 and substrate 16.

In addition, conventional flexible PCB (FPC) connection request is given touch control chip and FPC headspace on hardware, is unfavorable for that system simplifies.And, by COG mode or COF mode, touch control chip and touch-screen become one, and have significantly reduced distance between the two, thereby have reduced whole volume.In addition, because induction electrode is general by substrate, tin indium oxide (ITO) being carried out to etching formation, and the touch control chip also is positioned on substrate, and therefore, line between the two can complete by an ITO etching, has significantly simplified manufacturing process.

Fig. 2 is the vertical view according to the induction electrode array of disclosure embodiment.It will be understood by those skilled in the art that shown in Fig. 2 to be only a kind of arrangement mode of induction electrode, in concrete enforcement, induction electrode can be arranged in any two-dimensional array.In addition, the spacing of each induction electrode on either direction can equate, can be also not wait.Those skilled in the art also should be understood that the quantity of induction electrode can be more than the quantity shown in Fig. 2.

It will be understood by those skilled in the art that to be only a kind of shape of induction electrode shown in Fig. 2.According to other embodiment, the shape of induction electrode can be rectangle, rhombus, circle or oval, can be also irregularly shaped.The pattern of each induction electrode can be consistent, can be also inconsistent.For example, the induction electrode at middle part adopts diamond structure, the employing triangular structure at edge.In addition, the size of each induction electrode can be consistent, can be also inconsistent.For example, larger by inner induction electrode size, the size of the edge that keeps to the side is less, so is conducive to the touch precision at cabling and edge.

Each induction electrode has wire to draw, and wire is distributed in the space between induction electrode.Generally speaking, wire is as far as possible even, and cabling is as far as possible short.In addition, the cabling scope of wire guarantee safe distance as far as possible narrow under prerequisite, thereby leave the more area of induction electrode for, make induction more accurate.

Each induction electrode can be connected to bus 22 by wire, and bus 22 by wire directly or with the pin of touch control chip, be connected after certain sequence.For the touch-screen of giant-screen, the quantity of induction electrode may be very many.In this case, can be with all induction electrodes of single touch control chip controls; Also can control respectively the induction electrode of zones of different with a plurality of touch control chips by screen partition, between a plurality of touch control chips, can carry out clock synchronous.Now, bus 22 may be partitioned into several bus collection, in order to be connected from different touch control chips.The induction electrode of each touch control chip controls equal number, or the induction electrode of control varying number.

For the induction electrode array shown in Fig. 2, wiring can realize on the same layer of induction electrode array.For the induction electrode array of other structures, if be difficult to realize with layer cabling, wire also can be arranged in another layer that is different from induction electrode array place layer, by through hole, connects each induction electrode.

Detecting the touch position of body on touch-screen in the utility model embodiment has two schemes, and a kind of is the self-capacitance detection scheme, and a kind of is the mutual capacitance detection scheme.

The touch of induction electrode array shown in Fig. 2 based on self-capacitance detects principle.Ad-hoc location on the corresponding screen of each induction electrode, in Fig. 2,2a-2d means different induction electrodes.21 mean a touch, and when touch occurs in certain corresponding position of induction electrode, the electric charge on this induction electrode changes, and therefore, detects the electric charge (current/voltage) on this induction electrode, can know whether this induction electrode touch event occurs.Generally speaking, this can be converted to digital quantity to analog quantity by analog to digital converter (ADC) and realizes.The electric charge change amount of the induction electrode area capped with induction electrode is relevant, and for example, in Fig. 2, the electric charge change amount of induction electrode 2b and 2d is greater than the electric charge change amount of induction electrode 2a and 2c.

All there is corresponding induction electrode each position on screen, there is no physical connection between induction electrode, therefore, the capacitive touch screen that disclosure embodiment provides can be realized real multi-point touch, has avoided self-capacitance in the prior art to touch the ghost point problem detected.

The induction electrode layer can be combined with display screen by surperficial laminating type, also can accomplish display screen inside to the induction electrode layer, for example embedded (In-Cell) touch-screen, can also accomplish the display screen upper surface to the induction electrode layer, for example externally embedded type (on-Cell) touch-screen.

In the utility model embodiment, passive touch body can comprise finger or other passive pens etc., and active touch body can comprise active pen etc.

Shown in Fig. 3 is the schematic diagram that in the present embodiment, self-capacitance detects, and wherein, touch control chip 10 comprises drive source 24, testing circuit 25 and sequential control circuit 23, and induction electrode 19 is connected with described testing circuit 25 with described drive source 24 respectively; When sequential control circuit 23 starts drive source 24 according to preset control program, testing circuit 25 detects the self-capacitance variable quantity of described each induction electrode 19, thereby detects the touch location of passive touch body on touch-screen 11.

Sequential control circuit 23 is controlled the work schedule of each drive source 24 and testing circuit 25.And the driving sequential of induction electrode 19 has multiple choices.Sequential control circuit 23 control drive sources 24 start each induction electrode 19 simultaneously or divide into groups and start, so that 25 pairs of described each induction electrodes of described testing circuit detect or divide into groups simultaneously, detect.

As shown in Figure 4 A, all induction electrodes drive simultaneously, detect simultaneously.This mode completes the needed shortest time of single pass, and drive source quantity is (consistent with the quantity of induction electrode) at most.As shown in Figure 4 B, the drive source of induction electrode is divided into some groups, and every group drives the electrode in specific region successively.This mode can realize that drive source is multiplexing, but can increase sweep time, but by selecting suitable number of packet, can make drive source multiplexing and reach compromise sweep time.

Fig. 4 C shows conventional mutual capacitance and touches the scan mode detected, and supposes to have N to drive passage (TX), and be Ts the sweep time of each TX, and the time of having scanned a frame is N*Ts.And adopt the induction electrode driving method of the present embodiment, and all induction electrodes can be detected together, the time of having scanned a frame is Ts the most only.That is to say, touch to detect with conventional mutual capacitance and compare, the scheme of the present embodiment can improve sweep frequency N doubly.

For the mutual capacitance touchscreens that 40 driving passages are arranged, if each drives the sweep time of passage, be 500us, be 20ms the sweep time of whole touch-screen (frame), frame per second is 50Hz.50Hz often can not reach the requirement of good experience.The scheme of disclosure embodiment can address this problem.Be arranged in the induction electrode of two-dimensional array by employing, all electrodes can detect simultaneously, in the situation that keep 500us the detection time of each electrode, frame per second reaches 2000Hz.This is well beyond the application requirements of most touch-screens.Additional scan-data can be utilized by the digital signal processing end, for for example anti-interference or optimization touch track, thereby obtains better effect.

The In-Cell touch-screen utilizes the vertical blanking time of every frame to be scanned, but the vertical blanking time of every frame is only 2-4ms, and it is even larger that but often reach 5ms the conventional sweep time based on mutual capacitance.For realizing the use of In-Cell screen, usually reduce mutual capacitance and touch the sweep time of detecting, specifically reduce the sweep time of each passage, this method has reduced the signal to noise ratio (S/N ratio) of In-Cell screen, has affected to touch and has experienced.The scheme of disclosure embodiment can address this problem.For example, one has 10 to drive passage, conventional mutual capacitance touch to detect the In-Cell screen that be 4ms sweep time, and be only 400us the sweep time of each passage.By adopting the scheme of disclosure embodiment, all electrodes drive simultaneously and detect, all electrodes all scanned once only need 400us, if, by above-mentioned In-Cell screen, 4ms there is sweep time, also have a lot of time residues.The time saved can for repeatedly duplicate detection or Frequency detection etc., other detect, thereby greatly improve signal to noise ratio (S/N ratio) and the antijamming capability of detection signal, to obtain better detecting effect.

Preferably, detect the self-capacitance of each induction electrode.The self-capacitance of induction electrode can be its ground capacitance.

As an example, can adopt the charge detection method.As shown in Figure 5, drive source 41 provides constant voltage V1.Voltage V1 can be malleation, negative pressure or ground.S1 and S2 mean two controlled switchs, and 42 mean the ground capacitance of induction electrode, and 45 mean the electric charge receiver module, and electric charge receiver module 45 can be clamped to input terminal voltage designated value V2, and measures the quantity of electric charge inputed or outputed.At first, the closed S2 of S1 disconnects, and the top crown of Cx is charged to the voltage V1 that drive source 41 provides; Then S1 disconnects the S2 closure, and charge exchange occurs for Cx and electric charge receiver module 45.If charge transfer quantity is Q1, the top crown voltage of Cx becomes V2, by C=Q/ Δ V, Cx=Q1/ (V2-V1) is arranged, thereby realized capacitance detecting.

Shown in Fig. 6 is the schematic diagram that in the present embodiment, mutual capacitance detects, and wherein, when the active pen contact screen, the duty of each electrode as shown in Figure 6.The drive source of each electrode 19 cuts out at this moment, and a connection detection circuit 25 is done receiving end and used.Active pen 21 can send the signal 22 of certain frequency and amplitude, and has mutual capacitance between active pen and electrode, so the signal that active pen sends can be coupled on electrode.This coupled signal can be detected by 25 testing circuits.Notice that 22 are drawn as the square wave of fixed frequency here, in reality, 22 may be fixed frequency or Frequency, the square wave of fixed duty cycle or variable duty cycle, sinusoidal wave or other waveforms.23 sequential circuits are used for controlling synchronizeing of testing circuit and capacitance pen transmitted signal 22.

Different from hand, the contact area of active pen and capacitance plate is usually all very little, and general diameter only has 1～2mm.Mutual capacitance between active pen and electrode, only and the Range-based between active pen and electric capacity.Active pen and electrode distance are nearer, and mutual capacitance is larger, otherwise less.Therefore, the amplitude of the signal that each electrode receives, only can think and distance dependent, and the signal amplitude that the electrode from active pen close to more receives is stronger, and the signal amplitude that the electrode from active pen away from more receives is more weak.So, the signal amplitude power that we can utilize each electrode to receive, the position of accurately orienting active pen.For example, in Fig. 6, active pen 21 has dropped between electrode 19 and 18, and from 18 nearest, from 19 slightly away from, from 17 farther, the signal amplitude that three electrodes receive is as Fig. 6.In general, we can utilize centroid algorithm, orient the accurate location of active nib.Just simply meaned the amplitude information of a dimension in Fig. 6, in reality, the induction amount is a two-dimensional signal, and corresponding, the coordinate calculated is also two-dimensional signal.

Simultaneously, the signal that active pen sends may also comprise the supplementarys such as pressure, angle, and these information may be by frequency or amplitude modulation(PAM) in original signal.After testing circuit 25 receives signal, send the amplitude of waveform except recovering active pen, also need to resolve the information in waveform.In order to recover these information, the electric signal that testing circuit 25 need to send with active pen keeps synchronizeing.

A kind of possible synchronization mechanism is that the synchronous code that described testing circuit sends according to active touch body is adjusted to the electric signal of described active touch body transmission and synchronizeed.That is: testing circuit is adjusted to the electric signal of described active touch body transmission and is synchronizeed according to active touch body transmission synchronous code.Active pen sends a segment sync code before each scanning, detects and synchronizes with active pen according to synchronous code.

Another kind of synchronization mechanism is, described testing circuit is adjusted the phase place of this testing circuit, when the electrical signal amplitude that makes described testing circuit receive is maximum, reaches the electric signal sent with described active touch body and synchronize and keep synchronous with the electric signal of described active touch body transmission under described phase place.That is: testing circuit is adjusted phase place, when the electrical signal amplitude received is maximum, reaches the electric signal sent with described active touch body and synchronizes.Namely, according to energy information, allow testing circuit constantly adjust the phase place of the electric signal received, when the electrical signal amplitude received is maximum, represent that testing circuit and active pen are synchronous.Certainly also have other a lot of methods can realize synchronously.It should be noted that synchronous not certain needs of mentioning here.If only need the position of detecting pen, and do not need to receive supplementary, can not need synchronously, for example, by the mode of quadrature demodulation, can directly reply out signal amplitude.

The embodiment here supposes to need synchronous.When touch-screen only has hand to exist, the touch of hand is just detected in test side, but can constantly check the existence that has or not pen.When hand and active pen exist simultaneously, test side can detect, and synchronously goes up the signal of active pen, thereby adjusts the driving sequential of electrode and receive sequential, completes both are supported simultaneously.As Fig. 7.Only have the touch of hand during beginning, the now drive source work of electrode, and the charge/voltage of testing circuit detecting electrode, judge the position of hand.When the driving of electrode finishes, testing circuit also can work on a period of time, is used for during this period of time detecting the existence that has or not active pen.Because active pen can be launched the signal of characteristic frequency, therefore, this detection can complete by the energometry to a certain frequency, does not describe in detail herein.The driving signal of active pen and the driving signal of induction electrode can slightly be had any different, and for example, have different frequencies, or have different amplitudes.Like this, can conveniently detect the existence that the induction electrode judgement has or not active pen.

Once have active pen touch the screen body, this time active pen the driving signal, just can be detected.But in this time, the driving signal of active pen and the driving signal of electrode itself are also asynchronous, may cause in a frame, and electrode is when driving, and a certain partial information will be lost or destroy to active pen also, driving, like this.So synchronization mechanism is constantly adjusted the driving of local electrode and is received sequential.This adjustment may be by continuous delay operation, or the PLL(phaselocked loop) realize, this synchronizing process likely needs the time of some frames.After synchronously completing, the drive source of induction electrode drive source and active pen can guarantee not overlapping in time, and testing circuit also can be synchronous with the driving signal of active pen, therefore, just can detect completely the position of selling with active pen.In the utility model, the distribution of each electrode is fully independently, so each electrode of synchronizing circuit is also independently, if for saving resource, also can some zones merges and uses same synchronization mechanisms.

When having a plurality of active pens to exist, because two active pens unlikely are placed on same position physically, or stipulate that two active pens can not be too approaching and be put into same electrode top.If adopt each above-mentioned electrode that independently synchronizing circuit is arranged, even a plurality of power supply pens adopt same sweep frequency, also can support a plurality of active pens.Especially, when the position of two active pens is close especially, likely certain electrode can receive the information of two active pens simultaneously, now, need scan mode some difference slightly of two active pens, or different synchronous codes is arranged, make induction electrode can distinguish two pens.

In time, in same frame, need to detect hand, active pen 1, active pen 2 simultaneously ... active pen N.But different from traditional active pen system, the active pen system in the utility model, when carrying out the hand detection, the needed time is very short.As previously mentioned, if touch-screen has N to drive passage (TX), in the situation that do not consider pen, the time that the utility model scans a frame is the tradition 1/N of sweep time.As Fig. 8, in a frame, can there is the more time to detect for the scanning of pen and synchronous.Like this, the utility model embodiment is in the situation that the maintenance frame per second is constant, and the utility model scheme can be supported more active pen.In addition, can use identical scan mode or different scan modes between a plurality of active pens.For example, use identical or different sweep frequency, use identical or different dutycycle etc.This does not affect implementation of the present utility model.

When only having an active pen to exist, short owing to comparing traditional approach sweep time in this programme, the unnecessary time also can be supported a power supply Multiple-Scan, like this, utilizing the multiframe data to do signal processes, can greatly promote the linearity of power supply pen, the indexs such as precision, have better performance performance than traditional active pen system.

Simultaneously, because distribution of electrodes mode of the present utility model is two-dimentional absolute electrode, all corresponding electrode in each position on screen, therefore, even a plurality of active pen adopts same transmission frequency, while detecting a plurality of active pen, can there do not is ghost point phenomenon yet, can reflect the coordinate of real a plurality of.

Shown in Fig. 9 is an overhaul flow chart in the utility model embodiment, wherein, requires in preset control program first to detect the touch of hand, then detects the touch of active pen.

Step 101, startup mobile phone detecting pattern, detect the touch of hand;

Whether step 102, restart the active pen detecting pattern, detecting active pen has touch;

Step 103, the touch of active pen whether detected;

Step 104, when the touch of active pen being detected, each induction electrode is synchronizeed with the electric signal of active pen respectively;

The concrete touch location of step 105, detection active pen.

To the above-mentioned explanation of the disclosed embodiments, make those skilled in the art can realize or use the utility model.Multiple modification to these embodiment will be apparent for a person skilled in the art, and General Principle as defined herein can be in the situation that do not break away from scope of the present utility model, realization in other embodiments.Therefore, the utility model should not be restricted to disclosed these embodiment, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (13)

1. a capacitive touch screen, is characterized in that, comprising:

Substrate, be arranged at a plurality of induction electrodes on described substrate, and described a plurality of induction electrodes are arranged in two-dimensional array; And being tied to the touch control chip on described substrate, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes;

Described touch control chip comprises drive source, testing circuit and sequential control circuit, and described each induction electrode is connected with described testing circuit with described drive source respectively;

Described sequential control circuit starts according to preset control program or closes described drive source, and described testing circuit detects the capacitance change of described each induction electrode, thereby detects the touch location touched on the described touch-screen of body.

2. capacitive touch screen according to claim 1, it is characterized in that, when described sequential control circuit starts described drive source according to preset control program, described testing circuit detects the self-capacitance variable quantity of described each induction electrode, thereby detects the touch location of passive touch body on described touch-screen.

3. capacitive touch screen according to claim 1, it is characterized in that, when described sequential control circuit is closed described drive source according to preset control program, described testing circuit detects the mutual capacitance variable quantity of described each induction electrode, thereby detects the touch location of active touch body on described touch-screen.

4. according to the arbitrary described capacitive touch screen of claim 1-3, it is characterized in that, described sequential control circuit is controlled described drive source and described each induction electrode is started simultaneously or divide into groups and start, so that described testing circuit detects described each induction electrode or divides into groups simultaneously, detects.

5. capacitive touch screen according to claim 3, is characterized in that, the electric signal that described testing circuit and described active touch body send is asynchronous.

6. capacitive touch screen according to claim 3, is characterized in that, the electric signal that described testing circuit sends with described active touch body keeps synchronizeing.

7. capacitive touch screen according to claim 6, is characterized in that, the synchronous code that described testing circuit sends according to active touch body is adjusted to the electric signal of described active touch body transmission and synchronizeed.

8. capacitive touch screen according to claim 6, it is characterized in that, described testing circuit is adjusted the phase place of this testing circuit, when the electrical signal amplitude that makes described testing circuit receive is maximum, reaches the electric signal sent with described active touch body and synchronize and keep synchronous with the electric signal of described active touch body transmission under described phase place.

9. according to the arbitrary described capacitive touch screen of claim 1-3, it is characterized in that, the driving frequency of described each induction electrode has at least one.

10. according to the arbitrary described capacitive touch screen of claim 1-3, it is characterized in that, described a plurality of induction electrode belongs at least more than one induction electrode zone, the quantity of described touch control chip is identical with the quantity in described induction electrode zone, and each touch control chip is connected by wire respectively with each induction electrode in induction electrode zone under its control.

11. capacitive touch screen according to claim 10, is characterized in that, the clock synchronous of described each touch control chip or asynchronous.

12. according to the arbitrary described capacitive touch screen of claim 1-3, it is characterized in that, the shape of described induction electrode is at least one in rectangle, rhombus, circle, ellipse.

13. described capacitive touch screen as arbitrary as claim 1-3 is characterized in that described substrate is glass substrate, described touch control chip is tied on substrate in glass flip chip (Chip-on-Glass) mode; Perhaps

Described substrate is flexible substrate, and described touch control chip covers crystalline substance (Chip-on-Film) mode with flexibility and is tied on substrate; Perhaps

Described substrate is printed circuit board, and described touch control chip is tied on substrate in the mode of chip on board encapsulation (Chip-on-Board).

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