The content of the invention
Based on this, the present invention is intended to provide a kind of can induction pressure and touch-screen simple in construction, with low costAnd the display device with the touch-screen.
A kind of touch-screen, including cover sheet, touch sensing unit and pressure sensitive unit, the touch senseAnswer unit be used for sense the touch signal that puts on cover sheet, the pressure sensitive unit applies for sensingThe pressure signal on cover sheet is added on, the touch sensing unit includes touching driving electrodes and touch sensibleElectrode, the pressure sensitive unit includes one or more strains being made up of CNT or graphene and sensedThe touch driving electrodes and/or touch sensible electrode of device, the strain inductor and touch sensing unit are located at sameOne substrate surface.
In one of the embodiments, the touch driving electrodes and/or touch sensible electrode are CNT electricityPole or Graphene electrodes.
In one of the embodiments, it is described touch driving electrodes be indium-tin oxide electrode or metal grid electrode,Or the touch sensible electrode is indium-tin oxide electrode or metal grid electrode.
In one of the embodiments, in addition to the first base material and the second base material, the touch driving electrodes andTouch sensible electrode one of both and strain inductor be located at the first base material on, it is described touch driving electrodes andAnother in both touch sensible electrodes is located on the second base material.
In one of the embodiments, the cover sheet is the base material, the strain inductor, touchDriving electrodes and touch sensible electrode are respectively positioned on the cover sheet.
In one of the embodiments, the strain inductor is located at touch-screen edge mid-points and touch screen centerCentre position between the two.
In one of the embodiments, in addition to temperature-compensating inductor, the temperature-compensating inductor and instituteState strain inductor to be located on same base material, the structure of the temperature-compensating inductor and the strain inductorStructure it is identical.
In one of the embodiments, the temperature-compensating inductor is located at the marginal position of touch-screen.
In one of the embodiments, in addition to processor, the processor connect the pressure sensitive unit,Touch sensing unit and temperature-compensating inductor.
In one of the embodiments, the strain serpentine-like structure of inductor or pectinate texture, the pressureSensing unit also includes the lead for connecting the strain inductor and processor, and the line width of the lead is much larger thanThe line width of the strain inductor.
In one of the embodiments, the temperature-compensating inductor, strain inductor are with being located at same base materialOn touch driving electrodes and/or touch sensible electrode between with ground connection wire separate.
A kind of display device, including the touch-screen and display screen be combineding with each other, the touch-screen are above-mentioned anyA kind of described touch-screen.
The pressure sensitive unit for detecting pressure signal is produced on touching for the detection touch signal of touch-screen by the present inventionTouch in sensing unit, while the signal detection of pressure sensitive unit and the signal detection of touch sensing unit can be withUsing same processor, with simple in construction, the low feature of cost.
And constitute touch driving electrodes of the strain inductor of pressure sensitive unit with constituting touch sensing unitAnd/or touch sensible electrode be located at same substrate surface, can with the whole touch-screen of thinning and the thickness of display device,It can also shorten production and the assemble flow of display device simultaneously.
Embodiment
The touch-screen that the present invention is provided can be applied touches interaction shape in having for the types such as mobile phone, tablet personal computerOn the display terminal of formula, therefore the display device that the present invention is provided can be the types such as mobile phone, tablet personal computerElectronic product.The display device that the present invention is provided includes above-mentioned touch-screen and the display screen with Touch Screen.
The touch-screen includes cover sheet, touch sensing unit and pressure sensitive unit.
Cover sheet can be strengthened glass cover plate, plastic cover plate, polymethyl methacrylate cover plate, Lan BaoOne kind in stone cover plate.Cover sheet is used to provide guarantor for the component such as touch sensing unit and pressure sensitive unitBarrier is protected, while in some embodiments, it is also possible to directly as formation touch sensing unit and pressure sensitiveThe base material of unit, such as cover sheet and touch sensing unit can form OGS structures known in the art.In other embodiment, touch sensing unit can be formed on single base material, for example cover sheet andTouch sensing unit can form GF structures known in the art, GF2 structures, GFF structures etc..
The touch sensing unit includes touching driving electrodes and touch sensible electrode.Touch sensing unit is used forSense the touch signal put on cover sheet.The touch signal includes the two dimension parallel to cover sheetThe touch input signals such as contact, slip, dragging on direction, or even including on cover sheet direction(for example bend the arc of screen every empty input signal (i.e. suspension touch control signal) or the side at cover sheet edgeShape side) touch input signal.
One touched in driving electrodes and touch sensible electrode can be by carbon nano-tube film or graphene filmConstitute, another can be then made up of other arbitrary transparency conducting layers, for example, can be tin indium oxide (ITO),Or opaque but process itself controls size to cause the sightless other materials of naked eyes, such as metal grill(metal mesh), conductive silver paste, development etc., naturally it is also possible to be CNT or graphene.
In certain embodiments, the touch-screen also includes the first base material and the second base material, the touch drivingElectrode and touch sensible electrode one of both are produced in the first base material, and the touch sensible electrode and touch are feltAnother in both electrodes is answered to be produced on the second base material.The first base material, the second base material are by transparent plate body structureInto such as glass plate, PET sheet, PC plate.
Cover sheet, the first base material and the second base material are sequentially stacked and by transparent optical glue sticking.From verticalTouch driving electrodes and touch sensible electrode point in the direction observation of touch-screen, the first base material and the second base materialXing Cheng not have the pattern for the part that intersects, touch driving electrodes and touch sensible electrode formation capacitance touchDetection unit, can detect that acquisition puts on the one or more of touch screen surface using capacity coupled principleThe precise position information of touch control operation.
The function of being risen according to touch-screen concrete position is different, touch-screen can be divided into visible area and non-visualArea, touches driving electrodes and touch sensible electrode is arranged at the visible area of touch-screen.The touch sensible listMember also includes the bridging circuit for being arranged on non-visible area.Further, the touch-screen also includes flexible circuitPlate and processor.The bridging circuit is used to connect flexible PCB, processor and described touch driving electricityPole and touch sensible electrode.Bridging circuit can make to be formed using silver paste.
The pressure sensitive unit includes one or more strains being made up of CNT or graphene and sensedThe touch driving electrodes and/or touch sensible electrode of device, the strain inductor and touch sensing unit are located at sameOne substrate surface.For example, strain inductor can be produced in the first base material or be produced on the second base material.For another example when touching driving electrodes and touch sensible electrode is produced on cover sheet, the strain senseAnswer device to be also produced on cover sheet, the base material is served as with cover sheet.For another example the touch-screenCover sheet and the first base material can be included, touch sensible electrode fabrication is touched on a surface of cover sheetDriving electrodes and strain inductor are then produced on a surface of the first base material；Or touch sensible electrode, touchDriving electrodes and strain inductor are produced on a surface of the first base material.
Strain inductor and be located at visible area, for example, can be formed in touch-screen edge mid-points and touch screen center twoCentre position between person, or other correct positions.The serpentine-like structure of inductor or pectinate texture are strained,The pressure sensitive unit also includes the lead for connecting the strain inductor and processor.Specifically, leadConnection strain inductor and the bridging circuit positioned at non-visible area, then device is handled by bridging connection.LeadEqually it is made by CNT or graphene.
When touch-screen is pressed by touch operation, the strain inductor meeting being made up of CNT or grapheneThe cover sheet of touch-screen is followed while deforming upon, because CNT or graphene are one kind to strain/changeThe very sensitive pressure drag material of shape, its resistance value can produce corresponding change when strain inductor is deformed upon, andSignal detection and processing can be carried out by the processor of touch-screen.Meanwhile, detected by touch sensing unitThe touch location of touch-screen, thus has the detection function of touch signal and pressure signal concurrently.
Because there is corresponding relation in the size of touch-screen diverse location pressure and the strain of strain inductor,Namely there is corresponding relation in the size of touch-screen diverse location pressure and the resistance variations of strain inductor,Therefore the corresponding of resistance variations of the size of touch-screen diverse location pressure with straining inductor can be set upRelation.In follow-up detection, the touching position information and the resistance of strain inductor collected according to touch-screenChange information may determine that the pressure information of the touch pressing of touch-screen.
Influence of the generation to the resistance variations signal of strain inductor is strained due to lead to avoid or reducing,Line width of the line width of the lead much larger than the strain inductor, that is to say, that the resistance of lead is much smaller than shouldBecome the resistance of inductor.Much smaller than be defined herein as be less than or equal to five times and more than, further, less than etc.In ten times and more than.
Because the resistance of graphene or CNT is greatly influenced by temperature, therefore in certain embodiments, instituteStating touch-screen also includes temperature-compensating inductor.The structure phase of temperature-compensating inductor and the strain inductorIt is same or similar, for example can be pectinate texture or serpentine configuration.The temperature-compensating inductor senses with strainDevice is in close or identical temperature environment.In certain embodiments, the temperature-compensating inductor with it is describedInductor is strained to be located on same base material.Further, the temperature-compensating inductor is located at the side of touch-screenEdge position.Because temperature-compensating inductor is located at the edge of touch-screen, when touch-screen is touched, its deformation is non-Often small, the resistance variations of temperature-compensating inductor are very small, and the change in resistance compared to strain inductor can be withIgnore.
It is appreciated that temperature-compensating inductor can be not present in touch-screen, and by the electronics including touch-screenOther electron component in equipment is carried out to the signal for being caused the resistance variations of strain inductor due to temperature changeCompensation.
In certain embodiments, for avoid it is described strain inductor or temperature-compensating inductor be pointed to same baseThe function effect of touch driving electrodes and/or touch sensible electrode on material, temperature-compensating inductor, strain senseAnswer between device and touch driving electrodes and/or touch sensible electrode on same base material with the wire of ground connection everyOpen.Or, touch sensing unit can be made to be in different work from strain inductor and temperature-compensating inductorTime, i.e., time-sharing work is carried out according to different signal detection frequencies.
In certain embodiments, it is the resistance detection changing sensitivity of enhancing strain inductor, in touch-screenAs built Wheatstone bridge detection circuit on flexible PCB.Wheatstone bridge circuits are that one kind can be surveyed accuratelyMeasure the circuit of resistance.Turn into the one of wheatstone bridge circuits after straining inductor and wheatstone bridge circuits connectionPart, when touch-screen is by touch operation pressure, the resistance of strain inductor can change, Ran HoutongCross wheatstone bridge circuits detection.
Some embodiments of the present invention are described further again below with reference to accompanying drawing.
As shown in Figure 1, Figure 2 and Figure 3, in an embodiment, touch-screen of the invention include cover sheet 100,First transparency conducting layer 200 and the second transparency conducting layer 300.In this embodiment, the first transparency conducting layer200 are made up of carbon nano-tube film or graphene film, and the second transparency conducting layer then arbitrary transparent is led by otherElectric layer is constituted, such as ito thin film, Metal mesh films, carbon nano-tube film.
In Fig. 2, first conductive layer 200 includes the first base material 210, is arranged on the one of the first base material 210Conductive electrode and bridging circuit (not shown) on surface.Wherein conductive electrode is arranged on the first base material 210Visible area, bridging circuit is arranged on the non-visible area of the first base material 210.In the embodiment, non-visible area positionIn the periphery of visible area.Conductive electrode in the first base material 210 includes being used to form many of pressure sensitive unitIndividual strain inductor 220 and the first electrode 250 for forming touch sensing unit.Further, the first baseA temperature-compensating inductor 240 is also formed on material 210.The strain inductor 220 and temperature-compensating sensingDevice 240 is connected to non-visible area by lead 230, and with the bridging connection of non-visible area.Temperature is mendedThe graphics shape for repaying inductor 240 and strain inductor 220 is same or like.The strain inductor 220Figure main body be in pectinate texture, also referred to as serpentine configuration.As shown in Fig. 2 in the first base material 210Four strain inductors 220 and a temperature-compensating inductor 240 are provided with, the strain inductor 220 is excellentBit selecting is in touch-screen edge mid-points and the centre position of touch screen center between the two, the temperature-compensating sensingDevice 240 is located at the marginal position of touch-screen.
In other embodiments, as shown in Figure 3, the quantity of strain inductor 220 and position are alternatively itHe, such as centre position in touch-screen, and edge mid-points position etc. are provided with strain inductor 220.
First electrode 250 is in strip, it is possible to understand that can have other shapes in other embodiments, for exampleRhombus etc..
As shown in Figure 4, second transparency conducting layer 300 includes the second base material 310, is arranged on the second baseThe second electrode 330 on the surface of material 310 1, and bridging circuit (not shown).The wherein He of first electrode 250Second electrode 330 is used to form touch sensing unit, to be examined to the touch signal applied on the touchscreenSurvey.
Lead 320 is also set up on second base material 310 to connect the overlap joint circuit of second electrode 330 and non-visible areaConnect.Lead 320 can be formed by CNT or graphene.
Cover sheet 100, the first transparency conducting layer 200 and the second transparency conducting layer 300 are each other by saturatingLearn gluing company in Mingguang City.The touch-screen also includes flexible print circuit board and processor.For detecting pressure signalStrain inductor 220 and temperature-compensating inductor 240, and for detecting the touch sensible list of touch signalMember is used in conjunction with a processor to carry out signal detection and processing.
The pressure sensitive unit for detecting pressure signal is produced on touching for the detection touch signal of touch-screen by the present inventionTouch in sensing unit, while the signal detection of pressure sensitive unit and the signal detection of touch sensing unit can be withUsing same processor, with simple in construction, the low feature of cost.
And constitute touch driving electrodes of the strain inductor of pressure sensitive unit with constituting touch sensing unitAnd/or touch sensible electrode be located at same substrate surface, can with the whole touch-screen of thinning and the thickness of display device,It can also shorten production and the assemble flow of display device simultaneously.
Each technical characteristic of embodiment described above can be combined arbitrarily, not right to make description succinctThe all possible combination of each technical characteristic in above-described embodiment is all described, as long as however, these skillsContradiction is not present in the combination of art feature, is all considered to be the scope of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed,But can not therefore it be construed as limiting the scope of the patent.It should be pointed out that for this areaFor those of ordinary skill, without departing from the inventive concept of the premise, some deformations can also be made and changedEnter, these belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended powerProfit requires to be defined.