CN103425373A - Capacitive touch screen and wireless electronic device with capacitive touch screen - Google Patents

Abstract

The embodiment of the invention discloses a capacitive touch screen and a wireless electronic device with the capacitive touch screen. The capacitive touch screen comprises a capacitive touch screen body, a flexible circuit board and a connecting wire connecting the capacitive touch screen body and the flexible circuit board, and the part, located in the antenna radiating near-field zone of the wireless electronic device, of the connecting wire is low in electric conductivity. Due to the fact that the connecting wire low in electric conductivity has the effect of reducing electromagnetic wave radiation, electromagnetic wave energy radiated into the connecting wire can be reduced when radio frequency signals of an antenna are radiated to the position close to the connecting wire, and the strength of the radio frequency signals transmitted into the connecting wire is weakened. Thus, the interference of the radio frequency signals on induction of the capacitive touch screen is reduced when the capacitive touch screen is applied to the wireless electronic device, and performance of the capacitive touch screen is improved.

Description

A kind of capacitance touch screen and there is the radio-based electronic devices of this capacitance touch screen

Technical field

Embodiments of the present invention relate to capacitance touch screen manufacturing technology field, and more specifically, embodiments of the present invention relate to a kind of capacitance touch screen and have the radio-based electronic devices of this capacitance touch screen.

Background technology

The embodiments of the present invention that be intended to for stating in claims this part provide background or context.Description herein can comprise the concept that can probe into, but the concept of having expected or having probed into not necessarily.Therefore, unless at this, point out, otherwise for the application's instructions and claims, be not prior art in the content of describing in this part, and not because be included in just admit it is prior art in this part.

Touch-screen, as a kind of input medium, is the simplest, convenient, natural at present a kind of man-machine interaction mode.Therefore, touch-screen more and more is applied in various electronic equipments, such as mobile phone, notebook computer, MP3/MP4 etc.For reducing the cost of electronic equipment, make electronic equipment more frivolous, touch-screen is integrated in display panels usually.According to the difference of principle of work and detection touch information medium, touch-screen can be divided into resistance-type, condenser type, infrared-type and surface acoustic wave Four types.And the capacitive touch screen technology is due to the touch screen technology that technique is simple, life of product is grown, the transmittance high becomes current main flow.

There is signal receiving/transmission device in capacitance touch screen, comprise receiving end and transmitting terminal, its basic functional principle is the working method that adopts TX+RX, sent the driving electric signal of certain frequency and amplitude by transmitting terminal, by receiving end, received, and at receiving end, the touch sensible signal received is detected, to have judged whether to touch, occur.And also there is signal receiving/transmission device as the various wireless electronic products of capacitance touch screen typical case application, its basic function often comprises and transmits and receives various radio frequencies (Radio Frequency, be called for short RF) signal, as GSM signal, CDMA signal or WIFI signal etc.

Summary of the invention

But, the inventor finds in research process, when in prior art, capacitance touch screen is applied in radio-based electronic devices, because the transceiver of capacitance touch screen and various radio-based electronic devices is integrated in less space simultaneously, and can not time-sharing work, while causing in prior art that capacitance touch screen is applied in various radio-based electronic devices, the radiofrequency signal of radio-based electronic devices can cause interference to the electric signal of capacitance touch screen induction, causes the hydraulic performance decline of capacitance touch screen.

For this reason, be starved of a kind of capacitance touch screen, while being applied in various radio-based electronic devices to weaken capacitance touch screen, radiofrequency signal causes the phenomenon of interference to the electric signal of capacitance touch screen induction, improves the performance of capacitance touch screen.

In the present context, embodiments of the present invention are expected the radio-based electronic devices that a kind of improved capacitance touch screen is provided and has this capacitance touch screen.

In embodiments of the present invention, a kind of capacitance touch screen is provided, be applied to radio-based electronic devices, comprise: capacitance touch screen body, flexible circuit board and the connection wire that connects described capacitance touch screen body and described flexible circuit board, described connection wire is positioned at the connection wire that the part of described radio-based electronic devices aerial radiation near field region is low conductivity.

Compared with prior art, the capacitance touch screen that embodiment of the present invention provides, while being applied in radio-based electronic devices, described connection wire is positioned at the connection wire that the part of described radio-based electronic devices aerial radiation near field region is low conductivity, because the connection wire of low conductivity has the effect that reduces electromagenetic wave radiation, therefore, when the radiofrequency signal of antenna is radiated to while connecting near wire, can reduce and be radiated to the electromagnetic wave energy that connects wire inside, weaken the intensity that is transmitted to the radiofrequency signal that connects wire inside, thereby when reducing described capacitance touch screen and being applied in radio-based electronic devices, the interference of radiofrequency signal to the electric signal of capacitance touch screen induction, improve the performance of capacitance touch screen.

Preferably, described connection is led and is positioned at described radio-based electronic devices aerial radiation near field region, the connection wire that the part in the described antenna 20mm scope of distance is low conductivity.

In an embodiment of the invention, described connection wire is positioned at the connection wire that the part outside described aerial radiation near field region is high conductivity.

Preferably, the sheet resistance of the connection wire of described high conductivity is less than 10 ohm/side.

Preferred, the connection wire of described high conductivity is copper cash, silver slurry line or Graphene line.

In another embodiment of the present invention, described connection wire is positioned at the connection wire that the part outside described aerial radiation near field region is low conductivity.

Preferably, the connection wire of described low conductivity is indium oxide solder or nano-silver thread.

In another embodiment of the present invention, described capacitance touch screen body comprises electrode pattern district and touch key-press district, the electrode that the touch-control electrode in described touch key-press district is low conductivity.

In yet another embodiment of the present invention, the cabling that described connection wire is positioned at aerial radiation near field region part is shaped as shaped form.

In another embodiment of the present invention, the cabling that described connection wire is positioned at part outside the aerial radiation near field region is shaped as shaped form.

Preferably, described shaped form is arc or waveform.

Radio-based electronic devices also is provided in embodiments of the present invention, has comprised the described capacitance touch screen of above-mentioned any one.

Preferably, described radio-based electronic devices is mobile phone, panel computer, wireless Internet access basis or notebook computer.

The accompanying drawing explanation

Read detailed description hereinafter by reference to accompanying drawing, above-mentioned and other purposes of exemplary embodiment of the invention, the feature and advantage easy to understand that will become.In the accompanying drawings, in exemplary and nonrestrictive mode, show some embodiments of the present invention, wherein:

Fig. 1 schematically shows the structural representation of capacitance touch screen in prior art;

The structural representation of the capacitance touch screen provided in one embodiment of the present invention is be provided Fig. 2;

Fig. 3 schematically shows the local enlarged diagram of capacitive touch screen structure shown in Fig. 2;

The structural representation of the capacitance touch screen provided in another embodiment of the present invention is be provided Fig. 4;

The structural representation of the capacitance touch screen provided in another embodiment of the present invention is be provided Fig. 5;

The structural representation of the capacitance touch screen provided in another embodiment of the present invention is be provided Fig. 6;

Fig. 7 is for schematically showing the periodic square wave signal schematic diagram;

Fig. 8 schematically shows in the capacitance touch screen provided in one embodiment of the present invention, the port distribution schematic diagram of scattering model;

Fig. 9 schematically shows shown in Fig. 8 in capacitance touch screen, the local enlarged diagram of the port distribution of scattering model;

Figure 10 schematically show in the traditional capacitance touch-screen and one embodiment of the present invention in the capacitance touch screen that provides, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 301;

When Figure 11 schematically shows described radio-frequency signal source and is respectively 900MHZ, 1.8GHZ and 2.4GHZ, in the traditional capacitance touch-screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 301;

Figure 12 schematically show in the traditional capacitance touch-screen and one embodiment of the present invention in the capacitance touch screen that provides, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 302;

When Figure 13 schematically shows described radio-frequency signal source and is respectively 900MHZ, 1.8GHZ and 2.4GHZ, in the traditional capacitance touch-screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 302;

Figure 14 schematically show in the traditional capacitance touch-screen and one embodiment of the present invention in the capacitance touch screen that provides, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 303;

When Figure 15 schematically shows described radio-frequency signal source and is respectively 900MHZ, 1.8GHZ and 2.4GHZ, in the traditional capacitance touch-screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 303;

Figure 16 schematically shows in the capacitance touch screen provided in one embodiment of the present invention, the port distribution schematic diagram of radiation model;

Figure 17 schematically shows the average field intensity value at traditional capacitance touch-screen middle port 301, port 302 and port 303 places;

Figure 18 schematically shows the average field intensity value at capacitance touch screen middle port 301, port 302 and port 303 places that embodiment of the present invention provides;

Figure 19 schematically shows in the radio-based electronic devices with capacitance touch screen provided in one embodiment of the invention, the position view of antenna for mobile phone;

Figure 20 schematically shows in the capacitance touch screen that traditional capacitance touch screen and embodiment of the present invention provide, the contrast signal table of the RF average field intensity value that the electric signal of the capacitance touch screen that the sheet metal of analogue mobile phone antenna receives produces.

Embodiment

As previously mentioned, the inventor finds in research process: when capacitance touch screen of the prior art is applied in radio-based electronic devices, exist radiofrequency signal the capacitance touch screen electrical signal of reaction to be caused to the phenomenon of interference.

As shown in Figure 1, when in prior art, capacitance touch screen is applied in radio-based electronic devices, comprise: the capacitance touch screen body, comprise by a plurality of drive electrodes and induction electrode and form electrode pattern district 01 and touch key-press district 02, wherein, described touch key-press district 02 is positioned at radio-based electronic devices near the (not shown) antenna that receives and send radiofrequency signal, and described a plurality of drive electrodes and induction electrode are for receiving and send electric signal; Flexible circuit board 03, be provided with the capacitance touch screen control circuit on described flexible circuit board 03, described capacitance touch screen control circuit provides the driving signal through connecting wire 04 for described drive electrode on the one hand, receive on the other hand the electric signal of described induction electrode induction through connecting wire 04, should be appreciated that the described structural drawing of Fig. 1 is only the purpose for example, rather than limitation of the scope of the invention, in some cases, can increase as the case may be or reduce some structure.

The principle of work of described capacitance touch screen is: when the finger touch touch-screen, form a coupling capacitance between finger and touch-screen, this coupling capacitance causes the drive electrode of touch-screen and induction electrode self-capacitance over the ground to increase, or the mutual capacitance at drive electrode and place, induction electrode point of crossing reduces.

Concerning mutual capacitance detects, the transmitting terminal of capacitance touch screen control circuit sends the driving signal to drive electrode by connecting wire, produce induced signal through induction electrode, then be back to the receiving end of capacitance touch screen control circuit through connecting wire, the induced signal that described induction electrode produces can be activated the impact that electrode and the mutual capacitance of induction electrode infall diminish and change accordingly, thereby utilizes described capacitance touch screen control circuit to determine position of touch according to the variation of induced signal.

For self-capacitance, detect, the transmitting terminal of capacitance touch screen control circuit sends the driving signal to drive electrode or induction electrode by connecting wire, drive electrode or induction electrode produce induced signal, be back to the receiving end of capacitance touch screen control circuit through connecting wire, the induced signal that described drive electrode or induction electrode produce can be activated electrode and induction electrode self-capacitance over the ground becomes large impact and changes accordingly, thereby utilizes described capacitance touch screen control circuit to determine position of touch according to the variation of induced signal.

The inventor further studies discovery, pass through the radiofrequency signal of its antenna transmission for radio-based electronic devices, connect wire and be equivalent to a receiving antenna, when radio-based electronic devices passes through the antenna transmission radiofrequency signal, connect wire and now can receive this radiofrequency signal, and be transmitted to induction electrode, the induced signal that induction electrode is produced causes interference, affect the detection of the signal receiving end of described touch screen control circuit to induced signal, reduce the performance of described capacitance touch screen.

The inventor further studies discovery, can pass through to improve the antijamming capability of capacitance touch screen control circuit: adopt the software algorithm filtering, or in application circuit design the antijamming capability of elevator system, or adjust its physical location in structural design, or adopt the means such as shielding, when weakening capacitance touch screen and being applied in various radio-based electronic devices, radiofrequency signal causes the phenomenon of interference to electric signal.But these schemes all have certain limitation, wherein, the first scheme can increase the complexity of control circuit, and causes cost to rise; First scheme may affect the touch-control performance of capacitance touch screen; The third scheme need to increase the area of wiring board, and causes cost to rise; The 4th kind of scheme is comparatively harsh to the requirement of structural design.

On basis based on above-mentioned research, the radio-based electronic devices that embodiment of the present invention provides a kind of capacitance touch screen and had this capacitance touch screen, can significantly reduce or eliminate described radio-based electronic devices and pass through the interference of the radiofrequency signal of its antenna transmission to the electrical signal of reaction of described capacitance touch screen.Below with reference to some illustrative embodiments, principle of the present invention and spirit are described.Should be appreciated that providing these embodiments is only in order to make those skilled in the art can understand better and then realize the present invention, and not limit the scope of the invention by any way.On the contrary, it is in order to make the disclosure more thorough and complete that these embodiments are provided, and the scope of the present disclosure intactly can be conveyed to those skilled in the art.

The invention process embodiment provides a kind of capacitance touch screen, be applied to radio-based electronic devices, comprise: capacitance touch screen body, flexible circuit board and the connection wire that connects described capacitance touch screen body and described flexible circuit board, wherein, described connection wire is positioned at the connection wire that the part of described radio-based electronic devices aerial radiation near field region is low conductivity.

The capacitance touch screen that is applied to radio-based electronic devices that embodiment of the present invention provides, described connection wire is positioned at the connection wire that the part of the aerial radiation near field region of described radio-based electronic devices is low conductivity, radiofrequency signal for the radio-based electronic devices emission, connect wire and be equivalent to a receiving antenna, can calculate this connection wire from following formula, i.e. " antenna ", resistance R _ANTAnd quality factor q:

R _ANT=R _DC+R _AC （1）

$R_{\mathrm{DC}}\left(\mathrm{\Ω}\right)=\frac{\mathrm{\ρN}*l\left(m\right)}{D\left(m\right)*T\left(m\right)}---\left(2\right)$

$R_{\mathrm{AC}}=\frac{N*l\left(m\right)}{D\left(m\right)+T\left(m\right)}*\sqrt{\mathrm{\π\ρf}{\mathrm{\μ}}_0{\mathrm{\μ}}_r}---\left(3\right)$

The sheet resistance R of material:

$R=\frac{\mathrm{\ρ}}{T}---\left(4\right)$

Quality factor q:

$Q=\frac{2\mathrm{\πfL}}{R_{\mathrm{ANT}}}---\left(5\right)$

Wherein, R _ANTThe all-in resistance that means " antenna ", R _DCThe direct current resistance that means " antenna ", R _ACMean the AC resistance of " antenna ", ρ means the conductance of " antenna " material; N means the number of turns of " antenna "; I(m) mean the length (unit, rice) of " antenna ", D(m) mean to connect the width (unit, rice) of " antenna ", T(m) mean " antenna " thickness of coating (unit, rice), μ ₀Mean the magnetoconductivity in vacuum, μ _rMean the relative permeability of " antenna " material, L means the inductance of " antenna ", and f means radio frequency (RF) signal frequency.

From formula (1), to formula (5), can find out, when the magnetic permeability mu of the width D of " antenna ", thickness of coating T, length I, material ₀μ _rWith radio frequency (RF) signal frequency f mono-is regularly, the resistance R of " antenna " _ANTTo conductance ρ, the number of turns N of its material, be directly proportional, and quality factor q and its resistance R _ANTBe inversely proportional to.So fixedly the time, the conductance ρ of material is lower, the resistance R of " antenna " as N _ANTLarger, quality factor q is also just lower, and, for receiving antenna, quality factor q is lower, it is poorer that receiving antenna receives the performance of RF signal, and therefore, the connection wire of low conductivity has the effect that reduces electromagenetic wave radiation, thereby make the capacitance touch screen provided in embodiment of the present invention, can reduce the effect of electromagenetic wave radiation, thereby when weakening described capacitance touch screen and being applied in radio-based electronic devices, the interference of the electrical signal of reaction when RF signal is worked to capacitance touch screen.

For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.

Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can be in the situation that do similar popularization without prejudice to intension of the present invention.Therefore the present invention is not subject to the restriction of following public concrete enforcement.

Exemplary apparatus one:

As shown in Figures 2 and 3, embodiment of the present invention provides a kind of capacitance touch screen, comprise the capacitance touch screen body, comprise: by a plurality of drive electrodes and induction electrode, form electrode pattern district 1 and touch key-press district 2, wherein, touch key-press district 2 is arranged in radio-based electronic devices near the (not shown) antenna of reception and emitting radio frequency signal, and a plurality of drive electrodes and induction electrode are for receiving and send electric signal; Flexible circuit board (FPC) 3 and connect described capacitance touch screen body and the connection wire 4 of described flexible circuit board (FPC) 3, wherein, to be positioned at the part 41 of the aerial radiation near field region of described radio-based electronic devices be the connection wire of low conductivity to described connection wire 4.Wherein, the stacked structure of described capacitance touch screen can be G/F/F(glass+film+membrane structure) or G/G(glass+glass structure) or G/F(glass+membrane structure) or OGS(capacitance touch screen is integrated into to the single-glass structure in display panels) etc.; The working method of described capacitance touch screen can be self-capacitance mode, mutual capacitance mode or self preservation integral type mode etc.; Be provided with the capacitance touch screen control circuit on described flexible circuit board 3, in other embodiments of the present invention, described capacitance touch screen control circuit can also be arranged in main circuit board, and is electrically connected to the capacitance touch screen body by flexible circuit board; Described connection wire 4 can be many arbitrary of being connected in wire of described flexible PCB 3 with the capacitance touch screen body, also can comprise many many of being connected in wire of described flexible PCB 3 and capacitance touch screen body, and the present invention does not do restriction to this.

It should be noted that, in the art, usually the material that sheet resistance is greater than to 10 ohm/side is defined as the low conductivity material, the material that sheet resistance is less than or equal to 10 ohm/side is defined as high conductivity material, therefore, in embodiment of the present invention, the connection wire of described low conductivity is preferably the connection wire that sheet resistance is greater than 10 ohm/side.

Also it should be noted that, according to it, the distance apart from antenna is divided into three zones to the place in radio-based electronic devices around antenna:

The reactive near-field district, claim again reactive near-field region or induction near field region, it is a near-field region of next-door neighbour's antenna aperture in the aerial radiation place, reactive energy storage field is dominant, and usually, this regional boundary is got apart from antenna opening diametric plane λ/π place, in this zone, the two has phase differential electric field component and magnetic-field component, and electromagnetic energy alternately transforms in this zone, not outside emittance;

Radiading near-field region, surpass the reactive near-field district radiading near-field region of having arrived, also referred to as " Fresnel region (Fresnel region) ", in this zone, radiation field is preponderated, electromagnetic energy breaks away from the constraint of antenna, and with electromagnetic form to external radiation, and the angular distribution of radiation field and apart from the distance dependent of antenna aperture;

The radiation far-field region, claim again " far field (Fraunhofer region) ", electric field is identical with the phase place in magnetic field, and the forming energy radiation, in this zone, the angular distribution of radiation field and range-independence, strict says to only have the far-field region that just arrives antenna apart from the antenna infinite point, but on certain distance, angular distribution error when the angular distribution of radiation field and infinite distance is in the scope allowed the time, and this, the zone to infinite distance calls the radiation far-field region.

The border in common described radiading near-field region and radiation far-field region is the Rayleigh distance on Fresnel region and far field border, with be that wave path-difference is made criterion: " arriving the wave path-difference of the heart among the edge of antenna to be measured and antenna to be measured by spherical wave front from source antenna is λ/16 "

Be R=2D ²/ λ (6)

Wherein, R is antenna to be measured to the distance on border, radiation far-field region, D be antenna physics bore full-size (full-size of so-called physics bore refers to: suppose with a ball, antenna package to be wrapped, the diameter of this ball minimum.), λ is operation wavelength.

Also it should be noted that, the above-mentioned definition to radiation far-field region and radiading near-field region border, be its common definition, still, and is not suitable for the definition in radiation far-field region and radiading near-field region border in electronically small antenna.So-called electronically small antenna refers to, in whole working frequency range, the geometrical length of antenna is compared very little antenna with wavelength, and Wheeler (H.A.Wheeler) definition electronically small antenna length l meets:

l≤λ/2π (7)

In having the radio-based electronic devices of electronically small antenna, as mobile phone (antenna of embedded in mobile phone belongs to electronically small antenna), the definition on radiation far-field region and radiading near-field region border needs additional criteria.

A kind of Rule of judgment of described additional criteria is: total amplitude of establishing the radiading near-field region component is fully lower than total amplitude of radiation far-field region component, if radiading near-field region is by the random phase addition, and the peak valley that note causes thus rises and falls as △ L(dB), the subsidiary condition of measuring distance are:

$R^{\′}=\frac{R}{{10}^{\mathrm{\ΔL}/40}-1}---\left(8\right)$

Wherein, R' is the measuring distance (m) of the reactive near field region level of antenna to be measured, △ L be by antenna to be measured rotation, caused apart from peak valley scintillation error (dB).If establish this radiading near-field region component according to 1/r ²Decay, r is the distance of source antenna to antenna to be measured, often requires the radiading near-field region component at least than the low 35dB of radiation far-field region component, now peak valley fluctuating △ L ≈ 0.3dB, R'=10 λ.

Another Rule of judgment of described additional criteria is: rotate antenna to be measured and cause the change of measuring distance r little on the impact of measured result, still the peak valley of limiting distance rises and falls as △ L(dB):

$R^{\′\′}=\frac{{2D}_m}{{10}^{\mathrm{\ΔL}/10}-1}---\left(9\right)$

Wherein, R'' is while having definite rotation effect, the measuring distance of antenna to be measured (m), D _mThe maximum machine size (m) of antenna, △ L be by antenna to be measured rotation, caused apart from peak valley scintillation error (dB), and the fluctuations of establishing the distance of antenna to be measured and source antenna phase center is D _m/ 2.

In an embodiment of the invention, described radio-based electronic devices is mobile phone, adopts the second additional criteria, supposes that peak valley fluctuating uncertainty △ L is 0.5dB, D _m=100mm, calculate the enough little minor increment R''=164mm of gained antenna rotation effect to be measured by formula (9), that is to say that the border of the far field and near field in the embodiment of the present invention is at distance antenna 164mm place.But, for the complicated the integration environment as mobile phone, this is not a strict boundary, specifically depends on the circumstances.

Preferably, described connection is led 4 and is positioned at described radio-based electronic devices aerial radiation near field region, the connection wire that the part in the described antenna 20mm scope of distance is low conductivity.

The capacitance touch screen that embodiment of the present invention provides, the part 41 that is positioned at the aerial radiation near field region due to described connection wire 4 is the connection wire of low conductivity.As previously mentioned, the effect that there is the radio-frequency (RF) signal strength that reduces the radio-based electronic devices emission due to the connection wire of low conductivity, therefore, when the radiofrequency signal of antenna is radiated to while connecting near wire 4, can reduce and be radiated to the electromagnetic wave energy that connects wire 4 inside, weaken the intensity that is transmitted to the radiofrequency signal that connects wire 4 inside, thereby when reducing described capacitance touch screen and being applied in radio-based electronic devices, the interference of the electric signal that radiofrequency signal receives the capacitance touch screen control circuit.

As shown in Figure 4, in one embodiment of the invention, the electrode that touch-control electrodes in described touch key-press district 2 are low conductivity, thus when further weakening described capacitance touch screen and being applied in radio-based electronic devices, radiofrequency signal causes the phenomenon of interference to electric signal.

In another embodiment of the present invention, the part 42 that described connection wire 4 is positioned at outside the aerial radiation near field region of described radio-based electronic devices is the connection wire of high conductivity, resistance is less, thereby when reducing described capacitance touch screen and being applied in radio-based electronic devices, when radiofrequency signal causes interference phenomenon to electric signal, make described capacitance touch screen aisle resistance in suitable scope, guarantee the touch-control sensitivity of described capacitance touch screen.In this embodiment, preferred, the sheet resistance of the connection wire of described high conductivity is less than 10 ohm/side, preferred, and the connection wire of described high conductivity is copper cash, silver slurry line or Graphene line.

It should be noted that, in this embodiment, the making of described connection wire 4 needs two step silk-screen printing techniques or gold-tinted technique, and described connection wire 4 is positioned at the part 41 of described aerial radiation near field region and part 42 that described connection wire 4 is positioned at outside described aerial radiation near field region can be electrically connected at same layer, be that described connection wire 4 is positioned at the part 42 that the part 41 of described aerial radiation near field region and described connection wire 4 be positioned at outside described aerial radiation near field region and is electrically connected to by its side, it can be also overlap joint, make respectively part 41 and the described connection wire 4 that described connection wire 4 is positioned at described aerial radiation near field region and be positioned at the part 42 outside described aerial radiation near field region, and described connection wire 4 is positioned at the part 41 of described aerial radiation near field region and part 42 that described connection wire 4 is positioned at outside described aerial radiation near field region partly overlaps, realize that described connection wire 4 is positioned at the part 41 of described aerial radiation near field region and the electrical connection that described connection wire 4 is positioned at the part 42 outside described aerial radiation near field region, can also connect for bridge, make respectively part 41 and the described connection wire 4 that described connection wire 4 is positioned at described aerial radiation near field region and be positioned at the part 42 outside described aerial radiation near field region, and then making bridge, thereby realize that by bridge described connection wire 4 is positioned at the part 41 of described aerial radiation near field region and the electrical connection that described connection wire 4 is positioned at the part 42 outside described aerial radiation near field region, the present invention does not do restriction to this, as long as guarantee that described connection wire 4 is positioned at the part 41 of described aerial radiation near field region and the electrical connection that described connection wire 4 is positioned at the part 42 outside described aerial radiation near field region.

Also it should be noted that, in other embodiments of the present invention, described connection wire 4 can also adopt other techniques to make, and the present invention does not do restriction to this.

As shown in Figure 5, in another embodiment of the present invention, the part 42 that described connection wire 4 is positioned at outside described aerial radiation near field region is also the connection wire of low conductivity, thereby when further weakening described capacitance touch screen and being applied in radio-based electronic devices, radiofrequency signal causes the phenomenon of interference to electric signal, and the making of described connection wire 4 only needs a step serigraphy or gold-tinted technique to get final product, and technique is comparatively simple.In this embodiment, preferred, the sheet resistance of the connection wire of described low conductivity is greater than 10 ohm/side, and preferred, the connection wire of described low conductivity is tin indium oxide (ITO) line or nano-silver thread.It should be noted that, in other embodiments of the present invention, described connection wire 4 can also adopt other techniques to make, and the present invention does not do restriction to this.

As shown in Figure 6, in another embodiment of the present invention, the cabling that described connection wire 4 is positioned at aerial radiation near field region part is shaped as shaped form, thereby avoid line segment longer in described connection wire 4 identical with the polarised direction of antenna as far as possible, make in described capacitance touch screen the electromagenetic wave radiation direction that drives signal and/or induced signal to produce not identical with the electromagenetic wave radiation direction of described antenna transmission or received RF signal, thereby when further weakening described capacitance touch screen and being applied in radio-based electronic devices, radiofrequency signal causes the phenomenon of interference to electric signal.Preferably, described shaped form is arc or waveform.

In yet another embodiment of the present invention, it is also shaped form that described connection wire 4 is positioned at the wire shaped of walking of part outside the aerial radiation near field region, thereby, when further weakening described capacitance touch screen and being applied in radio-based electronic devices, radiofrequency signal causes the phenomenon of interference to electric signal.Preferably, described shaped form is arc or waveform.

The capacitance touch screen that embodiment of the present invention provides, while being applied in radio-based electronic devices, the radiofrequency signal that can significantly reduce radio-based electronic devices causes the phenomenon of interference to the electric signal of capacitance touch screen, and manufacture craft and control circuit for capacitance touch screen do not have specific (special) requirements, technique is simple, and cost is lower.In addition, the capacitance touch screen provided due to embodiment of the present invention, alleviate and even eliminated the demand that the antagonism radiofrequency signals such as capacitance touch screen control circuit, software, peripheral circuit are disturbed, thereby further promoted described capacitance touch screen performance, reduced cost of manufacture.

Exemplary apparatus two:

Embodiment of the present invention provides a kind of radio-based electronic devices, comprise: the capacitance touch screen provided in arbitrary embodiment in above-mentioned exemplary apparatus one, antenna and radiofrequency signal control circuit, wherein, antenna is for receiving and emitting radio frequency signal, described radiofrequency signal control circuit comprises receiving end and transmitting terminal, when described antenna is used for received RF signal, described receiving end is for receiving the radiofrequency signal of described antenna reception, when described antenna is used for emitting radio frequency signal, transmitting terminal is used for to described antenna transmission radiofrequency signal.In an embodiment of the invention, described radio-based electronic devices is preferably mobile phone, panel computer, wireless Internet access originally or notebook computer, but the present invention does not do restriction to this, as long as have reception and the dispensing device of radiofrequency signal in described radio-based electronic devices.

When in exemplary apparatus one, described in arbitrary embodiment, capacitance touch screen is applied in radio-based electronic devices, can significantly reduce radiofrequency signal and electric signal be caused to the phenomenon of interference, and manufacture craft and control circuit for capacitance touch screen do not have specific (special) requirements, technique is simple, and cost is lower, therefore, the radio-based electronic devices provided in embodiment of the present invention mode, can significantly reduce radiofrequency signal and electric signal be caused to the phenomenon of interference, and technique is simple, cost is lower.

And, the inventor also studies discovery: when capacitance touch screen of the prior art is applied to radio-based electronic devices, because the driving signal of described capacitance touch screen is periodic square wave signal, accordingly, the induced signal of its generation is also periodic square wave signal, and the higher hamonic wave of described square-wave signal is in the process of connection wire of flowing through, be equivalent to an emitting antenna owing to connecting wire, meeting is the generation alternating magnetic field near the connection wire, alternating magnetic field can produce alternating electric field again, so is concatenated to form to extraradial electromagnetic wave.Therefore, the frequency of the electromagenetic wave radiation that higher hamonic wave produces in described electric signal drops in the frequency acceptance band of radiofrequency signal, through the antenna reception of radio-based electronic devices and while being sent to the radiofrequency signal receiving end of radio-based electronic devices, can disturb the reception of radiofrequency signal.

Fourier series below by analytical cycle square-wave signal function f (t) illustrates the interference that the electric signal of capacitance touch screen receives radiofrequency signal.Any normal cycle is the function f (t) that T, first-harmonic angular frequency are Ω, all can be decomposed into the algebraic sum of a unlimited sine and cosine functions, and the trigonometric function form that expands into Fourier series is:

$f\left(t\right)=\frac{a_0}{2}+\underset{n=1}{\overset{\∞}{\mathrm{\Σ}}}{a}_n\cos \mathrm{n\Ωt}+\underset{n=1}{\overset{\∞}{\mathrm{\Σ}}}{b}_n\sin \mathrm{n\Ωt}---\left(10\right)$

DC component a wherein ₀:

$a_0=\frac{2}{T}{\&Integral;}_{t_0}^{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003569898400061.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+T}f\left(t\right)\mathrm{dt}---\left(11\right)$

The amplitude a of cosine component _n:

$a_n=\frac{2}{T}{\&Integral;}_{t_0}^{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003569898400061.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+T}f\left(t\right)\cos \left(n{\mathrm{\&Omega;}}_{1}t\right)\mathrm{dt}---\left(12\right)$

The amplitude b of sinusoidal component _n:

$b_n=\frac{2}{T}{\&Integral;}_{t_0}^{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA00003569898400061.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+T}f\left(t\right)\sin \left(n{\mathrm{\&Omega;}}_{1}t\right)\mathrm{dt}---\left(13\right)$

Therefore, periodic signal can be decomposed into DC component, fundametal compoment and series of harmonic component sum.

For the periodic square wave signal shown in Fig. 7, its f (t) functional expansion is that Fourier series is:

$f\left(t\right)\stackrel{k=\mathrm{1,2},...}{=}\frac{4}{T}(\sin \mathrm{\&Omega;t}+\frac{1}{3}\mathrm{<figure-callout\; id="3"\; label="sin"\; filenames="HDA00003569898400021.png,HDA00003569898400071.png"\; state="\{\{state\}\}">sin</figure-callout>}3\mathrm{\&Omega;t}+...+\frac{1}{2k-1}\sin (2k-1)\mathrm{\&Omega;t}+...)$

$=\frac{4}{T}\underset{k=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}\left[\frac{1}{2k-1}\sin (2k-1)\mathrm{\&Omega;t}\right]---\left(14\right)$

Can find out a of the Fourier series of the periodic square wave signal shown in Fig. 7 from formula (14) ₀And a _nBe zero, and there is no direct current and a cosine term, only, containing sine term, that is to say it is an odd function, its frequency spectrum is except first-harmonic Ω, also comprise 3 Ω, 5 Ω, 7 Ω ... odd number time high-frequency harmonic, these high-frequency harmonics drop in the frequency acceptance band of radiofrequency signal, by the antenna reception of radio-based electronic devices and while being sent to the receiving end of radiofrequency signal, can disturb the reception of radiofrequency signal, when the reduction capacitance touch screen is applied in radio-based electronic devices, the performance of described radio-based electronic devices.

And, in the radio-based electronic devices with the capacitance touch screen provided in exemplary apparatus one that embodiment of the present invention mode provides, described connection wire is positioned at the connection wire that the part of the aerial radiation near field region of described radio-based electronic devices is low conductivity.

Driving signal while working for capacitance touch screen, according to the reciprocity principle of antenna, now connect wire and be equivalent to an emitting antenna.Owing to driving signal, it is periodic square wave signal, the electric current of its higher hamonic wave connection wire of flowing through, and launch by connecting wire, when the frequency of this higher hamonic wave signal drops in the radio frequency reception frequency band of radio-based electronic devices, can produce and disturb radio frequency receiving signal, and the conductance ρ of material is lower, antenna resistance R _ANTLarger, quality factor q is also just lower.Reciprocity due to antenna, for emitting antenna, quality factor q is lower, the performance of transmission antennas transmit RF signal is poorer, so just reduced the effect of electromagenetic wave radiation, thereby the electric signal while weakening capacitance touch screen work receives the interference of signal to RF, further improved the performance of the radio-based electronic devices with capacitance touch screen.

Therefore, the radio-based electronic devices with the capacitance touch screen provided in exemplary apparatus one provided in embodiment of the present invention, can significantly reduce or eliminate the phase mutual interference of radiofrequency signal and capacitance touch screen electric signal, improve the performance of described radio-based electronic devices, and technique is simple, cost is lower.

Exemplary authentication one:

For the phase mutual interference between accurate evaluation and quantification radiofrequency signal and capacitance touch screen electric signal, an embodiment of the invention are relied on Maxwell's electromagnetic equation group, set up accurate all-wave electromagnetic field model, by finite element and method of moment, solved, capacitance touch screen and the traditional capacitance touch-screen that embodiment of the present invention was provided of below take all is applied to mobile phone as example, and the capacitance touch screen that embodiment of the present invention is provided and traditional capacitance touch-screen applications are carried out the contrast experiment in radio-based electronic devices the time.

With reference to figure 1, Fig. 3, Fig. 8 and Fig. 9, Fig. 1 be the traditional capacitance touch-screen applications when mobile phone, the schematic diagram of the connection wire 04 between flexible circuit board 03 and capacitance touch screen body 01; In the capacitance touch screen that Fig. 3 provides for embodiment of the present invention, connection wire 4(between flexible circuit board 3 and capacitance touch screen body comprises 41 and 42) schematic diagram, wherein 41 is parts that described connection wire 4 is positioned at the aerial radiation near field region, the 42nd, and described connection wire 4 is positioned at the part outside the aerial radiation near field region; The port distribution schematic diagram of the scattering model that Fig. 8 is described capacitance touch screen; The local enlarged diagram of the port distribution of the scattering model that Fig. 9 is described capacitance touch screen.Wherein, port 5 is positioned at 2 surfaces, touch key-press zone, the position of mobile phone main antenna normally, for the analog radio-frequency signal radiation source, port 301, port 302, port 303 are positioned at the Pin locations of described capacitance touch screen control circuit, and wherein, port 301 is communicated with the passage between port 5, passage between port 302 and port 5 is the adjacent first passages in port 301 right sides, and the passage between port 303 and port 5 is the adjacent second channels in port 301 right sides.

Utilize Finite Element Method, calculate respectively in traditional capacitance touch screen and one embodiment of the present invention in the capacitance touch screen that provides, port 5 is to the transmission coefficient of port 301, port 302 and port 303, result is as shown in Figure 10-15.Wherein, Figure 10 is in the capacitance touch screen provided with embodiment of the present invention in traditional capacitance touch screen, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 301, wherein, O10 is the transmission coefficient frequency response curve schematic diagram that traditional capacitance touch screen middle port 5 arrives passage between port 301, and the capacitance touch screen middle port 5 that N10 provides for embodiment of the present invention arrives the transmission coefficient frequency response curve schematic diagram of passage between port 301; Figure 11 is described radio-frequency signal source while being respectively 900MHZ, 1.8GHZ and 2.4GHZ, and in traditional capacitance touch screen and in the capacitance touch screen that provides of embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 301.Figure 12 is in traditional capacitance touch screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 302, wherein, O12 is the transmission coefficient frequency response curve schematic diagram that traditional capacitance touch screen middle port 5 arrives passage between port 302, and the capacitance touch screen middle port 5 that N12 provides for embodiment of the present invention arrives the transmission coefficient frequency response curve schematic diagram of passage between port 302; Figure 13 is described radio-frequency signal source while being respectively 900MHZ, 1.8GHZ and 2.4GHZ, and in traditional capacitance touch screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 302.Figure 14 is in traditional capacitance touch screen and in the capacitance touch screen provided in one embodiment of the present invention, port 5 is to the transmission coefficient frequency response curve contrast schematic diagram of passage between port 303, wherein, O14 is the transmission coefficient frequency response curve schematic diagram that traditional capacitance touch screen middle port 5 arrives passage between port 303, and the capacitance touch screen middle port 5 that N14 provides for embodiment of the present invention arrives the transmission coefficient frequency response curve schematic diagram of passage between port 303; Figure 15 is described radio-frequency signal source while being respectively 900MHZ, 1.8GHZ and 2.4GHZ, and in traditional capacitance touch screen and in the capacitance touch screen that provides of embodiment of the present invention, port 5 is to the transmission coefficient contrast table of passage between port 303.

From Figure 10 and Figure 11, can find out: in traditional capacitance touch screen, port 5 is to the transmission coefficient of passage between port 301, and embodiment of the present invention provides in capacitance touch screen, port 5, to the transmission coefficient of passage between port 301, approximately has the decay of 40dB; From Figure 12 and Figure 13, can find out: in traditional capacitance touch screen, port 5 is to the transmission coefficient of passage between port 302, in the capacitance touch screen that embodiment of the present invention provides, port 5, to the transmission coefficient of passage between port 302, has the decay that is greater than 20dB; From Figure 14 and Figure 15, can find out: in traditional capacitance touch screen, port 5 is to the transmission coefficient of passage between port 303, in the capacitance touch screen that embodiment of the present invention provides, port 5, to the transmission coefficient of passage between port 303, has the decay that is greater than 20dB.

As can be seen here, for the radiofrequency signal that connects wire spread, compared to the transmission coefficient that is connected wire between the capacitance touch screen body in traditional capacitance touch screen and capacitance touch screen control circuit, embodiment of the present invention provides the transmission coefficient that is connected wire between capacitance touch screen body in capacitance touch screen and capacitance touch screen control circuit that the decay that is greater than 20dB is arranged, thereby has reduced the interference of radiofrequency signal to the capacitance touch screen electric signal.

Produce strong-electromagnetic field during in high-power emission state when analogue mobile phone, at port 5(, be touch key-press zone 2) locate, introduce a plane electromagnetic wave of propagating along Z axis, its electric field intensity direction is consistent with the direction of electrode wires, as shown in figure 16, and the port distribution schematic diagram that Figure 16 is described capacitance touch screen radiation model, wherein, the plane electromagnetic wave along the Z-direction transmission that EMI is port 5 places feed-in, frequency is 900MHZ, intensity is 1V/m.Then, utilize in the capacitance touch screen that method of moment is calculated in traditional capacitance touch screen and embodiment of the present invention provides, port 301, the average field intensity at port 302 and port 303 places, 17 and 18 as shown in FIG., wherein, Figure 17 is traditional capacitance touch screen middle port 301, the average field intensity value at port 302 and port 303 places, the capacitance touch screen middle port 301 that Figure 18 provides for embodiment of the present invention, the average field intensity value at port 302 and port 303 places, contrast Figure 17 and Figure 18 can find out, in the capacitance touch screen that embodiment of the present invention provides, port 301, the rf electric field intensity that port 302 and port 303 places produce is significantly less than in traditional capacitance touch screen, port 301, the rf electric field intensity that port 302 and port 303 places produce.

As shown in Figure 19-Figure 20, wherein, sheet metal 6 analogue mobile phone antennas in Figure 19, frequency of port 301 places feed-in is the RF signal that 900MHZ, power are 1W, in the capacitance touch screen that Figure 20 provides for traditional capacitance touch screen and embodiment of the present invention, the contrast table of the RF average field intensity value that the electric signal of the capacitance touch screen that the sheet metal 6 of analogue mobile phone antenna receives produces; As seen from Figure 20, the capacitance touch screen provided in embodiment of the present invention, have equally larger decay for driving signal and/or the induced signal of capacitance touch screen, thereby reduced the interference of the electric signal of capacitance touch screen to radiofrequency signal.

In sum, the capacitance touch screen that embodiment of the present invention provides and there is the radio-based electronic devices of this capacitance touch screen, can significantly reduce the phenomenon of radiofrequency signal and the mutual interference of electric signal phase, and manufacture craft and control circuit for capacitance touch screen do not have specific (special) requirements, technique is simple, and cost is lower.

In this instructions, various piece adopts the mode of going forward one by one to describe, and what each part stressed is and the difference of other parts that between various piece, identical similar part is mutually referring to getting final product.

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

Claims (13)

1. a capacitance touch screen, be applied to radio-based electronic devices, the connection wire that comprises capacitance touch screen body, flexible circuit board and connect described capacitance touch screen body and described flexible circuit board, it is characterized in that, described connection wire is positioned at the connection wire that the part of the aerial radiation near field region of described radio-based electronic devices is low conductivity.

2. capacitance touch screen according to claim 1, is characterized in that, described connection wire is positioned at described radio-based electronic devices aerial radiation near field region, the connection wire that the part in the described antenna 20mm scope of distance is low conductivity.

3. capacitance touch screen according to claim 1, is characterized in that, described connection wire is positioned at the connection wire that the part outside the aerial radiation near field region of described radio-based electronic devices is high conductivity.

4. capacitance touch screen according to claim 3, is characterized in that, the sheet resistance of the connection wire of described high conductivity is less than 10 ohm/side.

5. capacitance touch screen according to claim 4, is characterized in that, the connection wire of described high conductivity is copper cash, silver slurry line or Graphene line.

6. capacitance touch screen according to claim 1, is characterized in that, described connection wire is positioned at the connection wire that the part outside the aerial radiation near field region of described radio-based electronic devices is low conductivity.

7. according to the described capacitance touch screen of claim 1-6 any one, it is characterized in that, the connection wire of described low conductivity is indium oxide solder or nano-silver thread.

8. capacitance touch screen according to claim 1, is characterized in that, described capacitance touch screen body comprises electrode pattern district and touch key-press district, the electrode that the touch-control electrode in described touch controlled key district is low conductivity.

9. capacitance touch screen according to claim 1, is characterized in that, the cabling that described connection wire is positioned at aerial radiation near field region part is shaped as shaped form.

10. capacitance touch screen according to claim 9, is characterized in that, the cabling that described connection wire is positioned at part outside the aerial radiation near field region is shaped as shaped form.

11. according to the described capacitance touch screen of claim 9 or 10, it is characterized in that, described shaped form is arc or waveform.

12. a radio-based electronic devices, is characterized in that, comprising: the described capacitance touch screen of any one in claim 1-11.

13. radio-based electronic devices according to claim 12, is characterized in that, described radio-based electronic devices is mobile phone, panel computer, wireless Internet access basis or notebook computer.

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