CN203502941U - Capacitive touch pad - Google Patents

Abstract

The embodiment of the utility model provides a capacitive touch pad. The capacitive touch pad comprises a printed circuit board, a plurality of induction electrodes which are arranged on the printed circuit board and are arranged to a two-dimensional array, and a touch control chip, which is bound on the printed circuit board in a chip-on-board manner (Chip-on-Board), wherein the touch control chip is respectively connected to each of the induction electrodes through a lead. According to the capacitive touch pad disclosed by the embodiment of the utility model, the anti-interference performance is improved on the premise of realizing multi-point touch.

Description

Capacitive type touch pad

Technical field

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

Background technology

Current, touch pad is widely used in various electronic products, as notebook computer, display, mobile phone and game machine etc., makes user without external equipment, has realized mobile office whenever and wherever possible.The problems such as existing capacitive type touch pad ubiquity interference free performance is poor, scanning frame per second is low, volume is large and manufacturing process is complicated.

Utility model content

In view of this, disclosure embodiment provides a kind of capacitive type touch pad, at least one among can overcoming the above problems.

The capacitive type touch pad that disclosure embodiment provides comprises:

Printed circuit board;

Be arranged at a plurality of induction electrodes on printed circuit board, described a plurality of induction electrodes are arranged in two-dimensional array; And

In chip on board (Chip-on-Board is called for short COB) mode, be tied to the touch control chip on printed circuit board, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes.

Preferably, described touch control chip configuration is for detecting the self-capacitance of each induction electrode.

Preferably, described touch control chip comprises: signal driver/receiving element, for driving described a plurality of touch sensible electrode, and receives the sensed data from described a plurality of touch sensible electrodes; And signal processing unit, for determining touch location according to described sensed data,

Wherein said signal driver/receiving element is configured to a plurality of induction electrodes described in voltage source or driven with current sources; Described signal processing unit is configured to calculate by the voltage of described a plurality of induction electrodes or frequency or electric weight the self-capacitance of described a plurality of induction electrodes.

Preferably, described touch control chip comprises: signal driver/receiving element, for driving described a plurality of touch sensible electrode, and receives the sensed data from described a plurality of touch sensible electrodes; And signal processing unit, for determining touch location according to described sensed data,

Wherein said signal driver/receiving element is configured to, and for each induction electrode, when driving this induction electrode, drives all the other induction electrodes; Or for each induction electrode, when driving this induction electrode, drive the induction electrode of this induction electrode periphery.

Preferably, for each induction electrode, described voltage source or current source have same frequency; Or

For each induction electrode, described voltage source or current source have two or more frequencies.

Preferably, described touch control chip configuration detects the self-capacitance of each induction electrode for detect the self-capacitance of all induction electrodes or the self-capacitance of each induction electrode of grouping detection simultaneously.

Preferably, described touch control chip configuration is for to determine touch location according to two-dimentional capacitance variations array.

Preferably, described touch control chip is also configured to adjust by the parameter of described voltage source or current source sensitivity or the dynamic range touch detecting, and described parameter comprises any or the combination among amplitude, frequency and sequential.

Preferably, the shape of described induction electrode is rectangle, rhombus, triangle, circle or oval.

Preferably, described wire is connected to described touch control chip by through hole.

According to the capacitive type touch pad of disclosure embodiment, adopt a plurality of induction electrodes that are arranged in two-dimensional array, improved interference free performance realizing under the prerequisite of multi-point touch.Utilize the scheme of disclosure embodiment, greatly eliminated power supply noise, also can weaken radio frequency (RF) and from the interference that shows other noise sources such as module.

According to the capacitive type touch pad of disclosure embodiment, touch control chip is connected by wire respectively with each induction electrode, and be tied on printed circuit board in COB mode, can avoid the many chip volumes that may cause of number of pin to increase and packaging cost raising.

In addition, by drive the induction electrode of all the other induction electrodes or tested electrode perimeter when driving and detecting tested electrode, be conducive to reduce the electric capacity of tested electrode, thereby reduce the impedance of tested electrode.By while or grouping, detect each induction electrode, can reduce sweep time, thereby avoid the many problems that may cause of induction electrode quantity.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the capacitive type touch pad that provides according to disclosure embodiment mono-;

Fig. 2 A is the top layer floor map according to the capacitive type touch pad of disclosure embodiment bis-;

Fig. 2 B is the bottom floor map according to the capacitive type touch pad of disclosure embodiment bis-;

Fig. 2 C is according to the side schematic view of the capacitive type touch pad of disclosure embodiment bis-;

Fig. 3 is according to the vertical view of the induction electrode array of disclosure embodiment bis-;

Fig. 4 to Fig. 7 B shows the induction electrode driving method according to disclosure embodiment tri-;

Fig. 8 A to Fig. 8 D shows according to four of the capacitive type touch pad of disclosure embodiment tri-application scenarioss;

Fig. 9 shows according to the signal flow diagram of the touch control chip of disclosure embodiment tri-;

Figure 10 A shows an example that adopts the coordinate of centroid algorithm calculated touch location according to disclosure embodiment tetra-;

Figure 10 B shows according to adopting the coordinate of centroid algorithm calculated touch location in the noisy situation of disclosure embodiment tetra-.

Embodiment

For object 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, represent that the sectional view of structure is disobeyed general ratio and done local amplification.And accompanying drawing is exemplary, it should not limit protection domain of the present utility model.The three-dimensional dimension that should comprise in addition, length, width and the degree of depth in actual fabrication.

Fig. 1 is the schematic diagram of the capacitive type touch pad that provides of disclosure embodiment mono-.As shown in Figure 1, this capacitive type touch pad comprises: printed circuit board 16; Be arranged at a plurality of induction electrodes 19 on printed circuit board, described a plurality of induction electrodes 19 are arranged in two-dimensional array; And being tied to the touch control chip (not shown) on printed circuit board 16 in the mode of chip on board (Chip-on-Board is called for short COB), described touch control chip is connected by wire respectively with each induction electrode 19.

The two-dimensional array that described a plurality of induction electrode 19 is arranged in can be the two-dimensional array of rectangular array or other analogous shapes.For capacitive type touch pad, each induction electrode 19 is capacitive transducers, and the electric capacity of this capacitive transducer changes when on touch pad, relevant position is touched.Employing is arranged in a plurality of induction electrodes 19 of two-dimensional array, has improved interference free performance realizing under the prerequisite of multi-point touch, has greatly eliminated power supply noise, also can weaken RF and from the interference of other noise sources such as liquid crystal display module.In connection with embodiment tetra-, will be described in detail this.

Each induction electrode 19 is wired to touch control chip, and this touch control chip is tied on printed circuit board 16 in COB mode.Owing to being connected by wire respectively with each induction electrode 19, the pin of touch control chip is a lot, therefore, touch control chip is tied to the difficulty that can avoid conventional encapsulation on printed circuit board 16 in COB mode, and the many chip volumes that may cause of number of pin increase and packaging cost improves.Described touch control chip itself is the wafer without encapsulation, that is to say, described touch control chip does not need to encapsulate, therefore, compare with the touch control chip that conventional touch pad is used, area on the printed circuit board taking is little, and has reduced the integral material cost of the encapsulation of chip and the cost of packaging and testing and touch pad.In addition, by COB mode, touch control chip and touch pad become one, and have reduced distance between the two, thereby have reduced whole volume.

Fig. 2 A is the top layer floor map according to the capacitive type touch pad of disclosure embodiment bis-.Fig. 2 B is the bottom floor map according to the capacitive type touch pad of disclosure embodiment bis-.Fig. 2 C is according to the side schematic view of the capacitive type touch pad of disclosure embodiment bis-.

As shown in Fig. 2 A to Fig. 2 C, this capacitive type touch pad comprises: double layer printed circuit plate 16; Be arranged at a plurality of induction electrodes 19 on the top layer of described double layer printed circuit plate 16, described a plurality of induction electrodes 19 are arranged in two-dimensional array; And in the mode of chip on board (Chip-on-Board, be called for short COB), being tied to the touch control chip 10 on the bottom of described printed circuit board 16, described touch control chip is connected by wire respectively with each induction electrode 19.

As an example, described wire can be connected to described touch control chip by through hole (via).

It will be understood by those skilled in the art that shown in Fig. 2 A 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 in 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 A.

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 A.According to other embodiment, the shape of induction electrode can be rectangle, rhombus, triangle, circle or oval, can be also irregularly shaped.On the edge of described touch sensible electrode, can also there is sawtooth.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, is so conducive to the touch precision at cabling and edge.

Fig. 3 is according to the vertical view of the induction electrode array of disclosure embodiment bis-.The touch of induction electrode array shown in Fig. 3 based on self-capacitance detects principle.Ad-hoc location on the corresponding touch pad of each induction electrode, in Fig. 3,2a-2d represents different induction electrodes.21 represent 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 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. 3, 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 touch pad, between induction electrode, there is no physical connection, therefore, the capacitive type touch pad that disclosure embodiment provides can be realized real multi-point touch, the error of having avoided the ghost point problem that in prior art, self-capacitance touch detects and noise to transmit between electrode and having caused, has significantly improved signal to noise ratio (S/N ratio).

As an example, in Fig. 3, each induction electrode can be wired to bus 22, is then connected with touch control chip.

Fig. 4 to Fig. 7 B shows the induction electrode driving method according to disclosure embodiment tri-.As shown in Figure 4, induction electrode 19 is driven by drive source 24, and drive source 24 can be voltage source or current source.For different induction electrode 19, drive source 24 not necessarily adopts identical structure.For example, can partly adopt voltage source, part adopts current source.In addition, for different induction electrode 19, the frequency of drive source 24 can be identical, also can be different.Timing control unit 23 is controlled the sequential of each drive source 24 work.

The driving sequential of each induction electrode 19 has multiple choices.Below with n induction electrode (D1, D2 ... Dj, Dk ... Dn) be example explanation.

As shown in Figure 5A, 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 5 B, the drive source of induction electrode is divided into some groups, and every group drives the electrode in specific region successively.It is multiplexing that this mode can realize drive source, but can increase sweep time, but by selecting suitable number of packet, can make drive source multiplexing and reach compromise sweep time.

Fig. 5 C shows conventional mutual capacitance and touches the scan mode detecting.Suppose to have n to drive passage (TX), 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 mutual capacitance touch pads that have 40 driving passages, if each drives the sweep time of passage, be 500us, be 20ms the sweep time of whole touch pad (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.By employing, be arranged in the induction electrode of two-dimensional array, 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 pads.Additional scan-data can be utilized by digital signal processing end, for for example anti-interference or optimization touch track, thereby obtains better 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 charge detection method.As shown in Figure 6, drive source 41 provides constant voltage V1.Voltage V1 can be malleation, negative pressure or ground.S1 and S2 represent two controlled switchs, and 42 represent the ground capacitance of induction electrode, and 45 represent 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 inputing or outputing.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 S2 closure, and charge exchange occur 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, has Cx=Q1/ (V2-V1), thereby has realized capacitance detecting.

As another example, also can adopt current source, or obtain its self-capacitance by the frequency of induction electrode.

Alternatively, in the situation that using a plurality of drive source, when detecting an induction electrode, for induction electrode adjacent with this induction electrode or periphery, can select to be different from the voltage of the drive source of this tested electrode.For succinct object, Fig. 7 B only shows three induction electrodes: tested electrode 57 and two adjacent electrodes 56 and 58.It will be understood by those skilled in the art that following example is also applicable to the situation of more induction electrodes.

The drive source 54 being connected with tested electrode 57 is connected to voltage source 51 by switch S 2, to realize the driving to tested electrode 57; And the induction electrode 56 adjacent with tested electrode 57 is connected with 55 with drive source 53 with 58, they can be connected to voltage source 51 or specific reference voltage 52(Vref by switch S 1 and S3, for example).If switch S 1 and S3 are connected to voltage source 51, with same voltage source, drive the electrode of tested electrode and periphery thereof simultaneously, can reduce like this voltage difference of tested electrode and its peripheral electrode, be conducive to reduce the electric capacity of tested electrode and be conducive to take precautions against the falseness touch that water droplet forms.

Preferably, touch control chip configuration is for adjust sensitivity or the dynamic range touch detecting by the parameter of drive source, and described parameter comprises any or the combination among amplitude, frequency and sequential.As an example, as shown in Fig. 7 A and Fig. 7 B, the sequential of the parameter of drive source (for example, driving voltage, electric current and frequency) and each drive source can be controlled by the steering logic 50 of the signal driving unit in touch control chip.By these parameters, can adjust different circuit working states, for example high sensitivity, moderate sensitivity degree or muting sensitivity, or different dynamic ranges.

Different circuit working states is applicable to different application scenarioss.Fig. 8 A to Fig. 8 D shows according to four of the capacitive type touch pad of disclosure embodiment tri-application scenarioss: finger normal touch, and finger suspension touch-control, active/passive pen or tiny conductor, and band gloves touch.In conjunction with above-mentioned parameter, can realize the detection to one or more normal touch and one or more tiny conductor touches.Although it will be understood by those skilled in the art that the signal receiving unit 59 shown in Fig. 7 B is separated with signal driving unit 50, in other embodiments, they can be realized by same circuit.

Fig. 9 shows according to the signal flow diagram of the touch control chip of disclosure embodiment tri-.On induction electrode, have and touch while occurring, the electric capacity of induction electrode can change, and this change amount converts digital quantity to by ADC, just can recover touch information.Generally speaking, electric capacity change amount and this induction electrode area that thing hides that is touched is relevant.Signal receiving unit 59 receives the sensed data of induction electrode, through signal processing unit, recovers touch information.

As an example, the following specifically describes the data processing method of signal processing unit.

Step 61: obtain sensed data.

Step 62: sensed data is carried out to filtering and noise reduction.The object of this step is the noise of as far as possible eliminating in original image, in order to subsequent calculations.This step specifically can adopt spatial domain, time domain or thresholding filtering way.

Step 63: find wherein possible touch area.These regions comprise real touch area and invalid signals.Invalid signals comprises large area touch signal, power supply noise signal, unsettled abnormal signal and water droplet signal etc.What these invalid signals had approaches with actual touch, and actual touch is disturbed in some meetings, and what have should not be resolved into normal touch.

Step 64: abnormality processing, to eliminate above-mentioned invalid signals and to obtain reasonable Petting Area.

Step 65: calculate according to the data of reasonable Petting Area, to obtain the coordinate of touch location.

Preferably, can determine touch location according to two-dimentional capacitance variations array.Particularly, can adopt centroid algorithm according to two-dimentional capacitance variations array, to determine the coordinate of touch location.

As an example, touch control chip can comprise: signal driver/receiving element, and being configured to provides driving signal to each touch sensible electrode, and receives the sensed data from each touch sensible electrode; And signal processing unit, be configured to determine touch location according to sensed data.Particularly, signal driver/receiving element can be configured to induction electrode described in voltage source or driven with current sources; Signal processing unit can be configured to calculate its self-capacitance (for example, ground capacitance) by the voltage of induction electrode or frequency or electric weight, and determines touch location according to the variable quantity of self-capacitance.

In addition, signal driver/receiving element can be configured to, and for each induction electrode, when driving this induction electrode, drives all the other induction electrodes; Or for each induction electrode, when driving this induction electrode, drive the induction electrode of this induction electrode periphery.

Figure 10 A shows an example that adopts the coordinate of centroid algorithm calculated touch location according to disclosure embodiment tetra-.For succinct object, only calculated in the following description the coordinate of a dimension of touch location.It will be understood by those skilled in the art that the true coordinates that can adopt same or similar method to obtain touch location.Suppose that the induction electrode 56-58 shown in Fig. 7 B is pointed covering, corresponding sensed data is respectively PT1, PT2, and PT3, and the corresponding coordinate of induction electrode 56-58 is respectively x1, x2, x3.Adopt the coordinate of the finger touch position that centroid algorithm obtains to be:

$X_{\mathrm{touch}}=\frac{\mathrm{PT}1*x1+\mathrm{PT}2*x2+\mathrm{<figure-callout\; id="3"\; label="PT"\; filenames="DEST\_PATH\_HDA0000435233360000062.png"\; state="\{\{state\}\}">PT</figure-callout>}3*x3}{\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3}---\left(1\right)$

Alternatively, after obtaining the coordinate of touch location, can also carry out step 66: analyze the data of frame in the past, to utilize multiframe data to obtain current frame data.

Alternatively, after obtaining the coordinate of touch location, also can carry out step 67: according to multiframe data, follow the tracks of touch track.In addition can also, according to user's operating process, draw event information and report.

According to the capacitive type touch pad of disclosure embodiment, can realize under the prerequisite of multi-point touch, solve the problem of noise stack in prior art.

The position 501 introducing power supply common-mode noises in Fig. 7 B of take are example, below analyze the impact of noise on the calculating of touch location.

Touching in the touch system detecting based on mutual capacitance of prior art, have a plurality of driving passages (TX) and a plurality of receiving cable (RX), and each RX is communicated with all TX.While having introduced a common mode interference signal in system, due to the connectedness of RX, noise can conduct on whole RX.Particularly, when having a plurality of noise source on a RX, the noise of these noise sources can superpose, thereby noise amplitude is increased.Voltage signal on the electric capacity that noise makes to measure etc. swings, thereby causes non-touch point to be reported by mistake.

In the capacitive type touch pad providing at disclosure embodiment, there is no physical connection between each induction electrode before being connected to chip internal, noise cannot transmit and superpose between induction electrode, has avoided wrong report.

Take voltage detecting method as example, and noise can cause the change in voltage being touched on electrode, thereby causes that the sensed data of the electrode that is touched changes.According to self-capacitance, touch and detect principle, the influence value that the influence value that noise causes and normal touch cause is all proportional to the capped area of the electrode that is touched.

Figure 10 B shows according to adopting the coordinate of centroid algorithm calculated touch location in the noisy situation of disclosure embodiment tetra-.Suppose that the influence value that normal touch causes is respectively PT1, PT2, PT3, the influence value that noise causes is PN1, PN2, PN3, (take induction electrode 56-58 as example):

PT1∝C58，PT2∝C57，PT3∝C56

PN1∝C58，PN2∝C57，PN3∝C56

Have: PN1=K*PT1, PN2=K*PT2, PN3=K*PT3, wherein K is constant.

When the polarity of voltage of noise and drive source is consistent, because the voltage final sensed data that superposes is:

PNT1=PN1+PT1=(1+K)*PT1

PNT2=PN2+PT2=(1+K)*PT2

PNT3=PN3+PT3=(1+K)*PT3

So, the coordinate that adopts centroid algorithm to obtain is:

$\begin{array}{c}{X}_{\mathrm{touch}}=\frac{\mathrm{PNT}1*x1+\mathrm{PNT}2*x2+\mathrm{<figure-callout\; id="3"\; label="PNT"\; filenames="DEST\_PATH\_HDA0000435233360000062.png"\; state="\{\{state\}\}">PNT</figure-callout>}3*x3}{\mathrm{PNT}1+\mathrm{PNT}2+\mathrm{<figure-callout\; id="3"\; label="PNT"\; filenames="DEST\_PATH\_HDA0000435233360000062.png"\; state="\{\{state\}\}">PNT</figure-callout>}3}\\ =\frac{(1+K)*\mathrm{PT}1*x1+(1+K)*\mathrm{PT}2*x2+(1+K)*\mathrm{<figure-callout\; id="3"\; label="PT"\; filenames="DEST\_PATH\_HDA0000435233360000062.png"\; state="\{\{state\}\}">PT</figure-callout>}3*x3}{(\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3)*(1+K)}\\ =\frac{\mathrm{PT}1*x1+\mathrm{PT}2*x2+\mathrm{<figure-callout\; id="3"\; label="PT"\; filenames="DEST\_PATH\_HDA0000435233360000062.png"\; state="\{\{state\}\}">PT</figure-callout>}3*x3}{(\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3)}\end{array}---\left(2\right)$

Visible, formula (2) equates with formula (1).Therefore, the capacitive type touch pad of disclosure embodiment is immune to common-mode noise.As long as noise does not exceed the dynamic range of system, just can not have influence on final definite coordinate.

What in this instructions, each embodiment stressed is the difference of other embodiment, same or analogous part reference mutually between each embodiment.

Above-mentioned explanation to the disclosed embodiments, makes those skilled in the art can realize or use the utility model.To the multiple modification of these embodiment, will be apparent for a person skilled in the art, General Principle as defined herein can, in the situation that not departing from scope of the present utility model, realize 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 (11)

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

Printed circuit board;

Be arranged at a plurality of induction electrodes on printed circuit board, described a plurality of induction electrodes are arranged in two-dimensional array; And

In chip on board mode, be tied to the touch control chip on printed circuit board, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes.

2. capacitive type touch pad as claimed in claim 1, is characterized in that, described touch control chip configuration is for detecting the self-capacitance of each induction electrode.

3. capacitive type touch pad as claimed in claim 2, is characterized in that,

Described touch control chip comprises: signal driver/receiving element, for driving described a plurality of touch sensible electrode, and receives the sensed data from described a plurality of touch sensible electrodes; And signal processing unit, for determining touch location according to described sensed data,

Wherein said signal driver/receiving element is configured to a plurality of induction electrodes described in voltage source or driven with current sources; Described signal processing unit is configured to calculate by the voltage of described a plurality of induction electrodes or frequency or electric weight the self-capacitance of described a plurality of induction electrodes.

4. capacitive type touch pad as claimed in claim 2, is characterized in that,

Described touch control chip comprises: signal driver/receiving element, for driving described a plurality of touch sensible electrode, and receives the sensed data from described a plurality of touch sensible electrodes; And signal processing unit, for determining touch location according to described sensed data,

Wherein said signal driver/receiving element is configured to, and for each induction electrode, when driving this induction electrode, drives all the other induction electrodes; Or for each induction electrode, when driving this induction electrode, drive the induction electrode of this induction electrode periphery.

5. capacitive type touch pad as claimed in claim 3, is characterized in that, for each induction electrode, described voltage source or current source have same frequency; Or

For each induction electrode, described voltage source or current source have two or more frequencies.

6. capacitive type touch pad as claimed in claim 2, is characterized in that, described touch control chip configuration is for detecting the self-capacitance of each induction electrode by detect the self-capacitance of all induction electrodes or the self-capacitance of each induction electrode of grouping detection simultaneously.

7. capacitive type touch pad as claimed in claim 2, is characterized in that, described touch control chip configuration is for to determine touch location according to two-dimentional capacitance variations array.

8. capacitive type touch pad as claimed in claim 3, it is characterized in that, described touch control chip is also configured to adjust by the parameter of described voltage source or current source sensitivity or the dynamic range touch detecting, and described parameter comprises any or the combination among amplitude, frequency and sequential.

9. capacitive type touch pad as claimed in claim 1, is characterized in that, the shape of described induction electrode is rectangle, rhombus, triangle, circle or oval.

10. capacitive type touch pad as claimed in claim 1, is characterized in that, described wire is connected to described touch control chip by through hole.

11. capacitive type touch pads as claimed in claim 1, is characterized in that, described printed circuit board is double layer printed circuit plate; Described a plurality of induction electrode is arranged on the top layer of described double layer printed circuit plate; Described touch control chip is tied on the bottom of described double layer printed circuit plate in chip on board mode.

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