CN203376725U - Capacitive touch screen - Google Patents

Abstract

The embodiment of the utility model discloses a capacitive touch screen. The capacitive touch screen comprises transparent mediums, a plurality of inducting electrodes which are arranged on the lower surface of the transparent mediums and arranged into a two-dimensional array, and a touch control chip bound to the lower surface of the transparent mediums, and the touch control chip is connected with each of the multiple inducting electrodes respectively through a wire. On the premise that multipoint touch control is achieved, the weight of the touch screen is reduced, manufacturing cost is reduced, noise is remarkably lowered, and the signal-to-noise ratio is improved.

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, capacitive touch screen is widely used in various electronic products, has been penetrated into gradually the every field of people's work and life.The size of capacitive touch screen day by day increases, and from 3 inches to 6.1 inches of smart mobile phone, to 10 inches left and right of panel computer, the application of capacitive touch screen more extends to intelligent television etc.But existing capacitive touch screen ubiquity cost of manufacture is high, touch-screen heavily waits problem.

The utility model content

In view of this, the utility model embodiment provides a kind of capacitive touch screen, at least one among can overcoming the above problems.

A kind of capacitive touch screen that the utility model embodiment provides comprises:

Transparent medium;

Be arranged at a plurality of induction electrodes of transparent medium lower surface, described a plurality of induction electrodes are arranged in two-dimensional array; And

Be tied to the touch control chip of transparent medium lower surface, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes.

Preferably, described capacitive touch screen also comprises:

With the flexible circuit board that described touch control chip is connected, described flexible circuit board is tied to the lower surface of described transparent medium by anisotropic conductive film ACF.

Preferably, described touch control chip is connected with described wire by ACF.

Preferably, described transparent medium is provided with viewing area, be provided with light shield layer at the lower surface of described transparent medium, and described light shield layer is positioned at outside described viewing area.

Preferably, described touch control chip, described flexible circuit board and described wire all are arranged at described light shield layer below.

Preferably, described transparent medium is high temperature resistance polyester PET film, polycarbonate film or polymetylmethacrylate film, and described transparent conductive material is tin indium oxide, Graphene or wire gauze.

Preferably, described transparent medium is the PET film, and described touch control chip bonding is to the lower surface of PET film;

Described transparent medium is the PC film, and described touch control chip bonding is to the lower surface of PC film;

Described transparent medium is the PMMA film, and described touch control chip bonding is to the lower surface of PMMA film.

Preferably, the shape of described induction electrode is rectangle, rhombus, circle or oval, and the size of each induction electrode in described a plurality of induction electrode is identical or different.

In the utility model embodiment, capacitive touch screen comprises: transparent medium, be arranged at a plurality of induction electrodes of transparent medium lower surface, a plurality of induction electrodes are arranged in two-dimensional array, be tied to the touch control chip of transparent medium lower surface, wherein the touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes, realizing having realized having alleviated under the prerequisite of multi-point touch the weight of touch-screen, reduce cost of manufacture, and significantly reduce noise, improve signal to noise ratio (S/N ratio).

The accompanying drawing explanation

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

Fig. 2 is the method for making process flow diagram of the capacitive touch screen that provides of the utility model embodiment;

Fig. 3 is the vertical view according to the induction electrode array of the utility model embodiment;

Fig. 4 to Fig. 7 shows the induction electrode driving method according to the utility model embodiment;

Fig. 8 shows four application scenarioss according to the capacitive touch screen of the utility model embodiment;

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

Figure 10 A shows an example of the coordinate that adopts the centroid algorithm calculated touch location;

Figure 10 B shows the coordinate that adopts the centroid algorithm calculated touch location in noisy situation.

Embodiment

For the purpose of this utility model, feature and advantage can more be become apparent, below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme of the utility model embodiment is described.Obviously, described embodiment is only a part of embodiment of the present utility model.Based on the utility model 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 schematic diagram of the capacitive touch screen that provides of the utility model embodiment.As shown in Figure 1, this capacitive touch screen comprises: transparent medium 1, be arranged at a plurality of induction electrodes 7 of transparent medium 1 lower surface, and a plurality of induction electrodes 7 are arranged in two-dimensional array; And the touch control chip 5 that is tied to transparent medium 1 lower surface, touch control chip 5 is connected by wire respectively with each induction electrode 7 among a plurality of induction electrodes 7.

Transparent medium 1 can be high temperature resistance polyester (PET, Polyethylene terephthalate) film can be also polycarbonate (PC, Polycarbonate) film, can also be the transparent films such as polymethylmethacrylate (PMMA, Polymethylmethacrylate) film.Transparent medium 1 lower surface is provided with a plurality of induction electrodes 7.A plurality of induction electrodes 7 are arranged in two-dimensional array, can be the two-dimensional arraies of rectangular array or other shapes.For capacitive touch screen, each induction electrode 7 is capacitive transducers, and the electric capacity of capacitive transducer changes when on touch-screen, relevant position is touched.

Alternatively, protective seam is set on induction electrode 7 with protection induction electrode 7.

Each induction electrode 7 is wired to touch control chip 5, touch control chip 5 is by anisotropic conductive film 4(ACF, Anisotropic Conductive Film) with the wire (not shown), be connected, the material of induction electrode 7 is transparent conductive material, tin indium oxide (ITO for example, Indium Tin Oxides) or Graphene or wire gauze (metal mesh), when transparent medium 1 is PET, when PC or PMMA film, touch control chip 5 is tied to PET, on PC or PMMA film, without encapsulation, so reduced the encapsulation of chip and the cost of package detection, the volume of chip wafer is little simultaneously, reduced area occupied, alleviated the weight of capacitive touch screen, and ITO and PET or PC or PMMA film are combined with can further weight reduction, increase penetrability.

Alternatively, flexible circuit board 3 is connected with touch control chip 5, and flexible circuit board 3 is not shown by ACF() be tied to the lower surface of transparent medium 1.

Transparent medium 1 is provided with the viewing area (not shown), this viewing area is touch area in actual applications or is included in touch area, be provided with light shield layer 2 and light shield layer 2 is positioned at outside viewing area at the lower surface of transparent medium 1, light shield layer 2 is by versicolor printing ink or can form with the light screening material of transparent medium 1 effective combination, touch control chip 5, flexible circuit board 3 and wire (not shown) all are arranged at light shield layer 2 belows, can effectively block the wire of the lower surface that is arranged at transparent medium 1, touch control chip 5 and flexible circuit board 3.

Fig. 2 is the method for making according to the above-mentioned capacitive touch screen of the utility model embodiment.

Step 21: the lower surface of transparent medium is plated to transparent conductive material, and transparent conductive material is carried out to etching form a plurality of induction electrodes, a plurality of induction electrodes are arranged in two-dimensional array;

Step 22: the lower surface by the touch control chip bonding to transparent medium is connected the touch control chip respectively with each induction electrode among a plurality of induction electrodes by wire.

Transparent medium can be the PET film, can be also the PC film, can also be the transparent films such as PMMA film.The lower surface of transparent medium is plated to transparent conductive material, and for example ITO or Graphene or wire gauze, then form a plurality of induction electrodes through etching.A plurality of induction electrodes are arranged in two-dimensional array, can be the two-dimensional arraies of rectangular array or other shapes.For capacitive touch screen, each induction electrode is a capacitive transducer, and the electric capacity of capacitive transducer changes when on touch-screen, relevant position is touched.

Alternatively, protective seam is set on induction electrode with the protection induction electrode.

When transparent medium is the PET film, the lower surface by the touch control chip bonding to the PET film; When transparent medium is the PC film, the lower surface by the touch control chip bonding to the PC film; When transparent medium is the PMMA film, the lower surface by the touch control chip bonding to the PMMA film, the mode of above-mentioned three kinds of binding touch control chips can be called Chip On PET/PC/PMMA, is called for short COP.Each induction electrode among a plurality of induction electrodes connects respectively an end of wire, the touch control chip is connected with the other end of wire by ACF, the material of induction electrode is transparent conductive material, for example ITO, Graphene or wire gauze, wire can for metal material or other conductive material making cases as, molybdenum-aluminium-molybdenum, silver-colored slurry, ITO or Graphene.By the COP technology without packaged chip, so reduced the encapsulation of chip and the cost of package detection, the volume of chip wafer is little simultaneously, reduced area occupied, alleviated the weight of capacitive touch screen, and ITO and PET or PC or PMMA film are combined with to the weight that can further alleviate capacitive touch screen, increase the penetrability of capacitive touch screen.

Flexible circuit board can be utilized hot-pressing technique and be tied to the lower surface of transparent medium by ACF.

Transparent medium is provided with the viewing area (not shown), this viewing area is touch area in actual applications or is included in touch area, be provided with light shield layer and light shield layer is positioned at outside viewing area at the lower surface of transparent medium, light shield layer is by versicolor printing ink or can form with the light screening material of the effective combination of transparent medium, touch control chip, flexible circuit board and wire all are arranged at light shield layer below, wire (not shown), touch control chip and the flexible circuit board that can effectively block the lower surface that is arranged at transparent medium.

Fig. 3 is the vertical view according to the induction electrode array of the utility model embodiment.It will be understood by those skilled in the art that shown in Fig. 3 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. 3.

It will be understood by those skilled in the art that to be only a kind of shape of induction electrode shown in Fig. 3.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 32 by wire, and bus 32 by wire directly or with the 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 32 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. 3, 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.

The touch of induction electrode array shown in Fig. 3 based on self-capacitance detects principle.Ad-hoc location on the corresponding screen of each induction electrode, in Fig. 3,3a-3d means different induction electrodes.31 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 pass through analog to digital converter (ADC, Analog to Digital Converter) and analog quantity is converted to digital quantity 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 3b and 3d is greater than the electric charge change amount of induction electrode 3a and 3c.

All there is corresponding induction electrode each position on screen, there is no physical connection between induction electrode, therefore, the capacitive touch screen that the utility model embodiment provides can be realized real multi-point touch, the error of having avoided the ghost point problem that in the prior art, the self-capacitance touch detects and noise to transmit between electrode and having caused, significantly improved signal to noise ratio (S/N ratio).

Fig. 4 to Fig. 8 shows the induction electrode driving method according to the utility model embodiment.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.Sequential control circuit 23 is controlled the sequential of each drive source 24 work.

The driving sequential of each induction electrode 19 has multiple choices.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.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. 5 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 the utility model 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.

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 6, 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.

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

Alternatively, in the situation that use a plurality of drive sources, when detecting an induction electrode, for adjacent with this induction electrode or induction electrode periphery, can select to be different from the voltage of the drive source of this tested electrode.For succinct purpose, Fig. 7 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 also is applicable to the situation of more induction electrodes.

The drive source 54 be 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 for example be connected to voltage source 51 or specific reference voltage 52(by switch S 1 and S3).If switch S 1 and S3 are connected to voltage source 51, drive the electrode of tested electrode and periphery thereof with same voltage source 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, the touch control chip configuration is for adjust sensitivity or the dynamic range touch detected 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 Figure 7, 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 of the signal drive circuit 50 in the 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 shows four application scenarioss according to the capacitive touch screen of the utility model embodiment: the finger normal touch, and finger suspension touch-control, active/passive pen or tiny conductor, and the 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 separates with signal drive circuit 50, in other embodiments, they can be realized by same circuit.

Fig. 9 shows the signal flow diagram according to the touch control chip of the utility model embodiment.Have on induction electrode 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 purpose 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 zones comprise real touch area and invalid signals.Invalid signals comprises large tracts of land 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: calculated according to the data of reasonable Petting Area, to obtain the coordinate of touch location.

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

Figure 10 A shows an example of the coordinate that adopts the centroid algorithm calculated touch location.For succinct purpose, 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 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.The coordinate of the finger touch position that adopts centroid algorithm to obtain is:

$X_{\mathrm{touch}}=\frac{\mathrm{PT}1*x1+\mathrm{PT}2*x2+\mathrm{PT}3*x3}{\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3}---\left(1\right)$

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

Alternatively, also can carry out step 67 after obtaining the coordinate of touch location: according to the 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 touch screen of the utility model 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 of take are example, below analyze the impact of noise on the calculating of touch location.

In the touch system detected based on the mutual capacitance touch of prior art, a plurality of driving passages (TX) and a plurality of receiving cable (RX) are arranged, 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 on a RX, a plurality of noise source being arranged, 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 touch screen provided at the utility model embodiment, there is no physical connection between each induction electrode before being connected to chip internal, noise can't transmit and superpose between induction electrode, has avoided wrong report.

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

Figure 10 B shows the coordinate that adopts the centroid algorithm calculated touch location in noisy situation.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 noise is consistent with the polarity of voltage of drive source, 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:

$X_{\mathrm{touch}}=\frac{\mathrm{PNT}1*x1+\mathrm{PNT}2*x2+\mathrm{PNT}3*x3}{\mathrm{PNT}1+\mathrm{PNT}2+\mathrm{PNT}3}$

$=\frac{(1+K)*\mathrm{PT}1*x1+(1+K)*\mathrm{PT}2*x2+(1+K)*\mathrm{PT}3*x3}{(\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3)*(1+K)}$

$=\frac{\mathrm{PT}1*x1+\mathrm{PT}2*x2+\mathrm{PT}3*x3}{(\mathrm{PT}1+\mathrm{PT}2+\mathrm{PT}3)}---\left(2\right)$

Visible, formula (2) equates with formula (1).Therefore, the capacitive touch screen of the utility model 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.

When the polarity of voltage of noise and drive source is contrary, can drag down useful signal.If the useful signal after dragging down can detect, from above analysis, do not affect final definite coordinate.If the useful signal after dragging down can not detect, the data failure of present frame.The sweep frequency of the capacitive touch screen but provided due to the utility model embodiment can be very high, and the N that can reach the conventional sweep frequency is (N is greater than 10 usually) doubly, utilizes this characteristic, can utilize the multiframe data to recover the data of present frame.It will be understood by those skilled in the art that due to the sweep frequency newspaper point rate required much larger than reality, therefore utilize the processing of multiframe data can not affect normal newspaper point rate.

Similarly, when noise limited exceeded the dynamic range of system, also can utilize the multiframe data to revise present frame, thereby obtain correct coordinate.The interframe disposal route is equally applicable to radio frequency and from the interference of other noise sources such as liquid crystal display module.

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 (8)

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

Transparent medium;

Be arranged at a plurality of induction electrodes of transparent medium lower surface, described a plurality of induction electrodes are arranged in two-dimensional array; And

Be tied to the touch control chip of transparent medium lower surface, described touch control chip is connected by wire respectively with each induction electrode among described a plurality of induction electrodes.

2. capacitive touch screen as claimed in claim 1, is characterized in that, described capacitive touch screen also comprises:

With the flexible circuit board that described touch control chip is connected, described flexible circuit board is tied to the lower surface of described transparent medium by anisotropic conductive film ACF.

3. capacitive touch screen as claimed in claim 1, is characterized in that, described touch control chip is connected with described wire by ACF.

4. capacitive touch screen as claimed in claim 1, is characterized in that, described transparent medium is provided with viewing area, be provided with light shield layer at the lower surface of described transparent medium, and described light shield layer is positioned at outside described viewing area.

5. capacitive touch screen as claimed in claim 2, is characterized in that, described touch control chip, described flexible circuit board and described wire all are arranged at described light shield layer below.

6. capacitive touch screen as claimed in claim 1, it is characterized in that, described transparent medium is high temperature resistance polyester PET film, polycarbonate film or polymetylmethacrylate film, and transparent conductive material is tin indium oxide, Graphene or wire gauze.

7. capacitive touch screen as claimed in claim 6, is characterized in that, described transparent medium is the PET film, and described touch control chip bonding is to the lower surface of PET film;

Described transparent medium is the PC film, and described touch control chip bonding is to the lower surface of PC film;

Described transparent medium is the PMMA film, and described touch control chip bonding is to the lower surface of PMMA film.

8. capacitive touch screen as described as any one in claim 1 to 7, is characterized in that, the shape of described induction electrode is rectangle, rhombus, circle or oval, and the size of each induction electrode in described a plurality of induction electrode is identical or different.

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