CN104298406A - Two-dimensional touch control sensor of combined structure - Google Patents
Two-dimensional touch control sensor of combined structure Download PDFInfo
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- CN104298406A CN104298406A CN201310396284.6A CN201310396284A CN104298406A CN 104298406 A CN104298406 A CN 104298406A CN 201310396284 A CN201310396284 A CN 201310396284A CN 104298406 A CN104298406 A CN 104298406A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3265—Power saving in display device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
Abstract
A two-dimensional touch control sensor of a combined structure comprises a plurality of sets of transparent electrodes which are attached to a substrate as patterns in the X and Y directions and are made of transparent conductive films, and at least one fine metal wire electrically connecting the same set of electrodes is attached to the substrate. In order to avoid affecting the vision, the equivalent diameter of the fine metal wire should be smaller than 30 micrometers. The fine metal wire is further used for forming a coil, the electrodes are made of the transparent films with high sheet resistance, and then the two-dimensional touch control sensor can be expanded to be used for detecting electromagnetic signals of a handwriting pen and used for handwriting input detecting needing higher accuracy and including a pressure function. The fine metal wire is used as a signal channel so that the two-dimensional touch control sensor can be applied to a large capacitance touch screen. The electrodes are made of the films with higher transparency and sheet resistance, the power consumption of a display panel can be reduced, and the influences of a touch panel on the vision are minimized.
Description
Technical field
The present invention relates generally to the sensing electrode of compatible with capacitance touch-screen and the sensor of electromagnetic induction sensing coil, relate more specifically to a kind of electric capacity and the basic structure of electromagnetic sensor that use lametta and thin film transparent conductor structure, belong to touch-control sensing input technology field.
Background technology
Along with popularizing of human-computer interaction technology, projected capacitive touch screen technology is widely used in the handheld device such as mobile phone, panel computer.In existing Projected capacitive touch screen panel, the technology be widely used most uses ITO to manufacture transparent touch electrode.Although ITO has good transmittance, the shortcoming that the prices of raw and semifnished materials are high, more frangible, resistivity is large limits the application of ITO in large scale product, and the whole world only has Ji Jia enterprise steady production can supply ITO touch panel.Although there is now the equivalent material of several ITO, as several in nano-silver thread (Ag NW), Graphene (Graphene), carbon nanotube (CNT) and conducting polymer (PEDOT) etc., although respectively have such as production technology simple, can be used for the features such as manufacturing flexible light transmission film, the cost of raw material are low, but with regard to penetrability and these two key characteristics of surface resistance, this different materials all also has certain gap compared with ITO, says nothing of alternative ITO for the larger sized touch-screen of size; The technique of the equivalent material of some kind is also had still to rest on laboratory stage, as Graphene.Although wherein nano-silver thread technology (Ag NW) performance is more better because mist degree large, be arranged on screen seems dusky and to be difficult to accept by a lot of client, and making technology is also immature at present, fails suitability for industrialized production.
Application number be 200980145532.1 and 201080053150.9 Chinese patent application individually disclose the U.S. like special Mel (Atmel) company and Japanese fuji film Co., Ltd. disclosed use metal trace (metal grill) to prepare touch electrode two kinds of technical schemes (industry is called Metal Mesh) and relevant detection or production method.Transmittance and the surface resistance of this technology are all better than ITO, and can suitability for industrialized production, but all there is following two problems: first is because metal trace is opaque, so very large induction area can not be used as ITO, although utilize the graphic designs optimized can obtain good sensitivity, but the induction electrode of contrast gross area, can prove that the sensitivity of touch sensible can be lower theoretically, be difficult to obtain the touch signal compared with high s/n ratio; Two is because of wire mesh grid of gathering at transparent substrate surface, so easily cause the Moire effect of visual ripple on the display screen, and with sized panel (as 1080p, 900p or 768p etc.) when different resolution, there will be different effects, the challenge for design is not little.The practical application of Taiwan Asus and Xin Li company all confirms that this defect is difficult to overcome, and advises careful use.Especially the technical scheme of Japanese fuji film Co., Ltd., the square node employing a large amount of regular shape, as touch detecting electrode, more easily produces Moire effect.
In addition for touching the operation being applied to the products such as panel computer, the hand-written picture and text input technology scheme that the precision being representative with electromagnetic induction hand-writing technique is higher there is no method at present and touching technique is integrated on a slice panel.This is because the resistivity of ITO is higher, be difficult to use in the low-resistance coil manufactured required for electromagnetic induction technology.Therefore occurred that touch product can not be hand-written, the untouchable problem of handwriting pad.Atmel company provide a kind of share hand-written and touch technical scheme, but both needed special chip and writing pencil, do not possess again the pressure-sensing capabilities that electromagnetic induction handwriting equipment possesses usually, be functionally short of to some extent.
Key in background technology herein and describe paragraph.
Summary of the invention
Object of the present invention has two.First, for existing use ITO etc., inorganic or organic transparent conductive material manufactures the problem that resistivity existing for capacitive touch screen is large, be not easy for larger-size touch-screen, the invention discloses conductor that a kind of use take lametta as signal transmission, with the technical scheme of other transparent conductive film materials touch sensing electrode that is the mixed structure of face sensor conductor, to solve the problem that existing transparent membrane sensor impedance is high, metal grill sensor easily produces moir patterns; Second, based on technique scheme, the invention also discloses a kind of technical scheme electromagnetic induction detecting electrode and capacitive sensing electrode merged, capacitive touch screen and electromagnetic induction magnetic test coil are integrated on one piece of panel, achieve the two compatibility functionally.
For achieving the above object, the two-dimentional touch sensing of composite structure of the present invention have employed following technical scheme: be laid with in substrate and be attached to some groups of transparency electrodes that substrate is made up of transparent conductive film, that extend along X and Y-direction with pattern form, also include at least one lametta often organizing in electrode, described lametta forms electrical connection by through for all transparency electrodes in same group together.
For reducing the impact of opaque lametta on vision, described lametta is enough thin.According to the minimum resolution characteristic of human eye when pupil diameter is maximum and the viewing ratio of different size display panel, the equivalent diameter that can set lametta is good between 2 microns ~ 30 microns.
Because lametta has resistivity low very well, thus can by lametta on a transparent substrate cloth be set as the shape of coil, to reach the object merged mutually with capacitive sensing electrode by electromagnetic induction unit.The technical scheme achieved this end has multiple as follows:
The first organization plan, to take the shape of the letter U the bearing of trend of described lametta along electrode group laying at substrate surface, and one end that the openend of U-shaped is located at electrode group forms two exits of electrode group; In a side arm through connecting electrode group of described U-shaped lametta, each electrode forms electrical connection, and another side arm insulate mutually along electrode group edge and with electrode group and lays.
The second organization plan, laid with the sensitivity increasing electromagnetic detection along the shape that the bearing of trend of electrode group is elongated multi-turn planar coil at substrate surface by described lametta, the exit of coil is positioned at one end of electrode group; One in described planar coil forms electrical connection along all electrodes in lametta this electrode group through of electrode group bearing of trend laying, and all the other lamettas insulate mutually along electrode group edge and with electrode group and lay.
The third organization plan, the shape that described lametta takes the shape of the letter U at substrate surface laid, the openend of U-shaped is located at one end of electrode group, forms two exits of electrode group; Each electrode in described electrode group is divided into the first sub-electrode and second sub-electrode of mutual insulating on the direction perpendicular with the bearing of trend of electrode group, and through the first sub-electrode with each electrode in group and the second sub-electrode do not form electrical connection to the two-arm of described U-shaped lametta across respectively.
4th kind of organization plan is the another kind of scheme increasing electromagnetic detection sensitivity: several sub-electrodes electrode of electrode group being divided on the direction perpendicular with the bearing of trend of electrode group mutual insulating; Described lametta is laid along the shape that the bearing of trend of electrode group is elongated planar coil at substrate surface, coil exit is positioned at one end of electrode group, form the trend of lametta with coil of planar coil, the sub-electrode in each electrode according to this from inside to outside or in the through described electrode group in ecto-entad ground forms electrical connection; Remaining lametta substrate surface along electrode or sub-electrode space lay.In fact, this structure contains the scheme in the 3rd scheme, electrode being divided into two sub-electrodes, is equivalent to the situation number of turns of the U-shaped one-turn coil of the 3rd scheme increased.
For the 5th kind of organization plan, for reducing eddy current that transparency electrode produces because of alternating magnetic field to the impact of detection sensitivity, by forming the sub-electrode of electrode in each electrode group, the direction identical with the bearing of trend of electrode group can also be divided into several sub-electrodes of mutual insulating further; The lametta of the described each sub-electrode of described through connection, through described each sub-electrode forms electrical connection.This structure also can be applied to the eddy current loss that other several organization plans aforesaid cause to reduce electrode.
According to said structure scheme, for reducing the resistance between each transparency electrode and lametta, can extend to be formed with described electrode in the through part together with each transparency electrode at lametta further and be electrically connected branch, and the edge of the length controlling branch makes its end not exceed electrode that this lametta connects or sub-electrode, sub-electrode.
Further, because lametta is very thin, for reducing because the open circuit problem that the even trickle fracture of flaw causes appears in lametta inside, improve the yield rate of product, the wiring path of the lametta beyond substrate surface electrode pattern is also laid with the electrically conducting transparent band with described electrode same material; Described lametta is formed with described conductive strips and is electrically connected.
For above for electromagnetic induction detect touch sensing, for reducing eddy current that transparency electrode produces because of alternating magnetic field to the impact of detection sensitivity, the resistivity of the transparent conductive film that transparency electrode uses is slightly larger is advisable, therefore can the preferred transparent conductive film of sheet resistance between 300 ~ 5000 ohm.
Above in various scheme, the position relationship between lametta and described transparency electrode can have two kinds: one to be the surface that lametta is directly attached to substrate, and described electrodes is on described substrate and surround described lametta; Two is that described transparency electrode is attached on described substrate; Lametta is attached to the surface of described electrode.
Finally, to intersect because what the electrode group of X and Y-direction to have in space morely, so preferably organization plan is by each electrode group of being connected in X and Y-direction and lametta wherein, be arranged in respectively on two surfaces being separated by dielectric.Typical structure is the two sides being laid in a slice transparent substrates.
Usefulness of the present invention shows three aspects.
First, transparent membrane electrode is used to make signalling channel as sensing unit, the low-down lametta of layout density, not only can not reduce the sensitivity that touches and detect but also can not produce as moir patterns etc. is easy to the impact discovered on vision, therefore the solution of the present invention is highly suitable for manufacture PC even electronic whiteboard large-sized touch-screen in using.
Second, because use metal wire as conductive channel and inductive coil, the larger transparent conductive film of sheet resistance is used to reduce as electrode the eddy current loss that sensing electrode produces, so can ideally the detecting unit of electromagnetic induction handwriting input and capacitive sensor unit be combined together, capacitance touch screen is possessed, and use is located more accurately and has the possibility of the electromagnetic handwritten function of pressure sensitivity ability.
3rd, because use lametta as signalling channel, so transparency conductive electrode can manufacture and design thinner, obtain higher transparency and need not scruple the high additional resistance brought thus, the power consumption that can reduce display panel can promote visual effect again.
Accompanying drawing explanation
Fig. 1: the position relationship schematic diagram in induction arrays between fine wire and transparency electrode;
Fig. 2 a, Fig. 2 b, Fig. 2 c: the syndeton schematic diagram in induction electrode between fine wire and transparency electrode;
Fig. 3: the mounting structure schematic diagram of transparency electrode when substrate the same face is arranged between fine wire;
Fig. 4 a, Fig. 4 b: utilize fine wire to form two kinds of electrode structure schematic diagram of individual pen electromagnetic induction coil.
Fig. 5 a, Fig. 5 b, Fig. 5 c, Fig. 5 d, Fig. 5 e: utilize fine wire to form several electrode structure schematic diagram of multi-turn electromagnetic induction coil.
Fig. 6 a, Fig. 6 b: the structural representation being laid in the electrically conducting transparent band on path, fine wire place.
Embodiment
Below in conjunction with accompanying drawing 1 ~ accompanying drawing 6, the specific embodiment of the present invention is described.Should be appreciated that embodiment is illustrating technical scheme, is not the concrete structure limiting technical scheme.
Be directed to the transparent conductive material ITO of widespread use on capacitance touch screen, had now multiple as the equivalent material such as nanometer, organic material.But the shortcoming that these material ubiquity resistivity are large, is difficult to as induction electrode for larger-size capacitance touch screen.The structure that Fig. 1 provides can address this problem effectively.What Fig. 1 provided is a dimension sensor including X-direction electrode group and some Y-direction electrode groups, can realize the detection of touch point in plane.In FIG, X0, X1 of being made up of transparent membrane electrode 101 is had in x and y direction respectively ... Xn and Y0, Y1 of being made up of transparent membrane electrode 102 ... the electrode groups such as Yn; In each electrode group, the electrode at least one lametta 103 or 104 difference same group of through Xn and Yn direction forms electrical connection, forms low-impedance signalling channel, Xn and Yn also represents that X and Y-direction often organize the I/O port of electrode simultaneously.Lametta can use the good conductor such as copper, silver, utilizes bonding, printing, deposition or the method such as photoetching corrosion to be arranged in substrate (transparent material).In FIG, represent the electrode group of Y-direction and X-direction respectively by the diamond shaped blocks of solid line and dotted line, same surface or different two surfaces of substrate (as glass or transparent membrane) can be arranged at.Because of length to limit and the arrangement pattern of electrode and combination belong to prior art, so do not provide the position view of n-th group of electrode of n>2 on each direction in Fig. 1.
In addition, what provide in Fig. 1 is the electrode of two-dimensional structure, and one-dimentional structure can use this structure equally as annular or strip ground electrode, just more simplifies, as independent by Y
0the group at place uses as strip shaped electric poles.
Because lametta itself is opaque, and the layout density of lametta is very little can not produce Moire effect, so the width of lametta itself is the principal element affecting visual effect.According to human eye under darker environmental baseline (when pupil diameter is 8mm to the maximum) highest resolution calculate, normal eye the highest resolution of the distance of distinct vision (being generally 25cm) be can resolution distance be 0.021mm(21 μm) two luminous points.Because as touch application, regardless of the size of display panel, distance between human body distance display panel can not more than the length of an arm, general between 35 ~ 50cm, institute thinks and avoids lametta obviously to affect display effect, the equivalent width of lametta should not be greater than 30 μm, and optimum width should within 20 μm.If be applied to the personal computer device such as notebook and desktop system, because size is less, the lametta that sectional area is less also can not cause very large resistance, and the width of lametta can also taper to 5 ~ 10 μm, to obtain better visual effect.For the application that size is less, thinner metal wire is more suitable for, and therefore can be set between 2 μm ~ 30 μm by the equivalent width of lametta according to different panel size, thickness can be set between several microns to tens microns.Here, the concept of equivalent width is the width of line for square-section, is wire diameter for round section, for other cross sectional shape, is then that metal wire is at suprabasil projection size.
What Fig. 2 showed is several conventional position relationship between transparency electrode and lametta, or perhaps the structure of the electrical connection of through mode.For the electrode of X-direction, the structure of Fig. 2 a to be transparency electrode 101 in the parcel cross section, surface of substrate 201 be circular lametta 103.Use this structure, first lametta can be laid on the surface of substrate, then utilize the modes such as printing transparency electrode to be coated in the surface of lametta and substrate, form package structure.Fig. 2 b is transparency electrode 101 is the structure of the lametta 103 of rectangle in the parcel cross section, surface of substrate 201.Fig. 2 c is then other a kind of structure, first printing transparent electrodes 101 in substrate, and then lametta 103 is laid on the surface of electrode with printing or deposition, the mode such as bonding, forms electrical connection.During design electrode, the one in these three kinds of syndetons of choice for use can be carried out according to the attainable technique of the producer.Implication through in the present invention is attached to electrode surface, through electrode interior or by the one in these three kinds of implications of electrodes surrounding, comprises above-mentioned several connected modes, and core implication is that reliable between fine wire with transparent membrane electrode is connected.Develop the technique allowing to print superfine metal trace (wire) on film or glass recently, therefore in the ordinary course of things, structure as shown in Figure 2 b can have been adopted.In aforementioned prior art, application number is the Chinese patent application of 201080053150.9, and disclosing a kind of manufacture method laying lametta on a transparent substrate can be for reference.
If the electrode of X and Y-direction is all laid in substrate and obtains same surface, be so communicated with between X-direction and the lametta of Y-direction and generally will have intersection, as shown in Figure 3.At this moment need to arrange insulation course or insulant 301 on the point of crossing of the lametta 103 and 104 of the electrode connecting different directions.About the insulation technology of this infall, the electrode of existing capacitance touch screen being widely used, is a kind of mature technology, and just technological process more complicated, is not described in detail in this.The simpler structure of technique is by each electrode group of being connected in X and Y-direction and lametta wherein, is arranged on two surfaces being separated by dielectric respectively; If the two sides being laid in a slice transparent substrates is a kind of possible constructions; The electrode component of X and Y-direction is not laid in the surface of two panels different base, is another kind of possible constructions.The technical process of these two kinds of structures is identical, but considers from the angle of reduction thickness, and the two sides structure that electrode component is not laid in a slice substrate is more excellent.Fig. 1 illustrates the structure of this embodiment, the electrode of Y-direction and lametta is laid in the front of transparent substrates, as shown in the solid line figure in figure; The electrode of X-direction and lametta are laid in the back side of transparent substrates, as shown in the dashed graph in figure.
Be directed to the concrete structure on capacitance touch screen induction panel of the solution of the present invention, especially the shape of transparent membrane electrode, more can refer to the structure of existing ito surface plate to design enforcement.Prior art also discloses if the Synthesis and applications of several ITO equivalent material such as carbon nanotube (CNT) and conducting polymer (PEDOT) is in the processing technology of contact panel, can be used for the processing and manufacturing of transparent membrane electrode at this.Therefore here no longer with regard to the technical scheme of touch-control sensing electrode do more speak more bright.
Some embodiments realizing electromagnetic induction detection in above-mentioned touch-control sensing electrode ground foundation will be mainly described below.
Be directed to the handwriting input application needing more high precision even to comprise pressure sensitivity, key lays the telefault that alternating magnetic field can be detected.Fig. 4 ~ Fig. 6 give multiple principle identical and with capacitance touch measuring ability detect mutually compatible, utilize fine wire to form the schematic diagram of the electrode structure of electromagnetic induction coil.
Fig. 4 a and Fig. 4 b gives the structure of the simplest two kinds of one-turn coil.In fig .4, the fine wire of X-direction can be divided into 103 and 401 two artificially, and connectivity port is also divided into Xna and Xnb two ports; Article two, the other end of lametta is connected by reflexing end 403.This structure is equivalent to the bearing of trend of described lametta along electrode group to take the shape of the letter U laying at substrate surface, and one end that the openend of U-shaped is located at electrode group forms two exits of electrode group; In a side arm through connecting electrode group of U-shaped lametta, each electrode forms electrical connection, and another side arm insulate mutually along electrode group edge and with electrode group and lays.Like this, the U-shaped loop of one end open just constitutes the inductive coil of an individual pen, and the openend of coil is two exits of this electrode group, i.e. port x na and Xnb.Identical with the structure of X-direction, the fine wire of Y-direction has 104 and 402 two at least, constitutes the one-turn coil of a U-shaped opening equally, has two word port Yna and Ynb, two subports; The other end is connected by reflexing end 404.
In fig. 4b, the shape that lametta takes the shape of the letter U at substrate surface laid equally, the openend of U-shaped is located at one end of electrode group, forms two exit Xna and Xnb of electrode group; Each electrode 102 in described electrode group be divided on the direction perpendicular with the bearing of trend of electrode group mutual insulating the first sub-electrode 101a and and the second sub-electrode 101b, described U-shaped lametta be also divided into the two-arm 103 and 401 forming U-shaped single layer coil artificially, be connected by reflexing end 403; Through the first sub-electrode with each electrode in group and the second sub-electrode do not form electrical connection to two-arm across respectively.The structure of Y-direction is identical with X-direction, and just each electrode is named as 102a and 102b two sub-electrodes, connects and composes the loop of U-shaped respectively by lametta 102,402 and reflexing end 404.
Here lametta is divided into the object of multistage is for convenience of description, but in implementation process, be actually a continuous print lametta, will divide no longer like this in the embodiment below, and unification represents with a lametta.Here connectivity port Xna and Xnb, Yna and Ynb, when for capacitance sensing, Xna and Xnb, Yna and Ynb all need in parallel use; When being used as electromagnetic induction and detecting, Xna and Xnb, Yna and Ynb, respectively as the input/output terminal of planar coil on X and Y-direction, need individually to be connected with control testing circuit.When reality is implemented, the electronic switch by controlling detection system realizes the switching of connected mode.This part belongs to prior art, therefore no longer this describes in detail.Connectivity port below in each embodiment is identical with usage with definition herein.
Structure shown in Fig. 4 a with Fig. 4 b can realize detecting with capacitance touch measuring ability function of electromagnetic induction compatible mutually, but the two also has certain difference.The advantage of the structure shown in Fig. 4 a is that electrode pattern design is simple, and shortcoming has two: one to be that the area of single coil is less, and electrode area is comparatively large and cause the eddy current loss of alternating magnetic field comparatively large in addition, therefore can have certain influence to the sensitivity of electromagnetic detection; Two is because the geometric center of coil does not overlap with the geometric center of electrode, and physical location and the capacitive sensing electrode detection of the time writer that electromagnetic induction coil detects are equipped with different to the physical bit pointed, and needs more complicated software correction.Advantage in structure shown in Fig. 4 b is that the physical location of the time writer that electromagnetic induction coil detects and capacitive sensing electrode detection are good to the physical location consistance pointed, and because the area of single coil is comparatively large, the area of the continuous conductor of formation electrode is less, can reduce the interior eddy current produced of electrode to the impact of electromagnetic detection sensitivity, therefore sensitivity is higher.Shortcoming is that the pattern of electrode is more complex, also slightly higher to manufacturing technique requirent.
In the structure that capacitance sensing in Fig. 1 above ~ embodiment illustrated in fig. 4 and electromagnetic induction detect, the transparent conductive film material that sheet resistance can be selected larger makes electrode.Because the resistance of fine wire is very little, if sheet resistance is comparatively large, so often organize each electrode in electrode, no matter the distance of itself and signal input output end, can obtain comparatively homogeneous impedance at input/output terminal.Such as this programme is used for the notebook computer of 14 inches, if according to the structural design touch sensor group shown in Fig. 1, the quantity of lametta is one, cross sectional dimensions is chosen to be 10 × 5 microns, the maximum resistance of the lametta so laid along screen X-direction (long limit) is about 105 ohm, minimum within 10 ohm.If the length of side of each electrode is 5 millimeters, if so select the transparent conductive film of 2000 Ω/sq as electrode, so the most advanced and sophisticated vicinity of electrode edge to the resistance of lametta at 1000 ohms.Relative to the most frequently used ito thin film, the resistance on electrode group bearing of trend is from hundreds of ohm to the variable quantity of tens kilo-ohms, and the resistance change of this programme only has more than 100 ohm.If select the transparent material that sheet resistance is larger, this relative variation can be less.This characteristic is very beneficial for the design of capacitance touch screen, can ignore the change of electrode resistance to the impact of capacitor charge and discharge constant.For the control IC of the capacitance touch screen of existing excellent in design, be under the condition in more stable thousands of Europe to tens kilo-ohm at electrode resistance, all effectively touch signal can be detected, therefore the structural design that can directly apply to this programme produce capacitance touch screen.Because same transparent conductive material, the less sheet resistance of thickness of film is larger, but transparency is higher, so this structure of the present invention can improve the transmittance of touch-screen to greatest extent.Resistivity as transparent polymer conductive material (PEDOT) is very large, mode of printing can also be used to lay electrode, be thus very applicable to application of the present invention.In the present invention, the scope that can be used for the sheet resistance of the transparent conductive film making electrode is very large, can use from 100 ohms to thousands of Ou Jun, and preferred value scope is also very large, from 500 ohm to 5000 ohm/sq.
Fig. 5 a ~ Fig. 5 d is other multi-turn planar coil and the schematic diagram of electrode structure.For simply clear, only provide the structural representation of n-th group of electrode in Y-direction here, wherein Yn represents the exit of n-th group of touch-control sensing electrode; Yna and Ynb represents two exits of electromagnetic induction coil.The structure of the remaining electrode group in X or Y-direction is identical.
Structure shown in Fig. 5 a is the expansion of Fig. 4 a, the part of expansion is that lametta 104 is many around at least one circle around electrode group, such lametta is laid, to increase the sensitivity of electromagnetic detection along the shape that the bearing of trend of electrode group is elongated multi-turn planar coil at substrate surface.The exit of coil is positioned at one end of electrode group, when coil can be avoided like this to draw in other direction, outside lead will become a part for coil, the sensitivity that the electromagnetic signal responded to is located time writer and precision can produce the impact not easily predicted, and therefore the extension line of embodiment median-plane is below arranged all like this.In this embodiment, one in planar coil forms electrical connection along all electrodes in lametta this electrode group through of electrode group bearing of trend laying, be one section of planar coil inner round portion in fig 5 a, all the other lamettas insulate mutually along electrode group edge and with electrode group and lay.
On lametta, also stretch out fish-bone sample branched structure 501 in Fig. 5 a, for increasing the contact area between lametta and induction electrode 102, reduce contact resistance.Same structure also may be used for the structure shown in Fig. 1 and Fig. 4 a, b, and Examples hereinafter and the structure given by accompanying drawing.If resistivity or the sheet resistance of induction electrode 102 are not very big, or the area of electrode is relatively very little, then this part branch can omit, and to reduce the wiring density of lametta, reduces lametta further to the impact of vision.It should be noted that the edge of the electrode that its end do not exceeded the length that will control branch this lametta connects or sub-electrode, sub-electrode, so as not to electrode inside and outside other current-carrying part short circuits.
In like manner, Fig. 5 b is the expansion of Fig. 4 b, the part of expansion is that lametta 104 is many around at least one circle around electrode group, and such lametta be the shape laying of elongated multi-turn planar coil at substrate surface along the bearing of trend of electrode group, to increase the sensitivity of electromagnetic detection.In figure 5b, each electrode 102 in electrode group is divided into the first sub-electrode 102a and the second sub-electrode 102b of mutual insulating equally on the direction perpendicular with the bearing of trend of electrode group, along two adjacent lamettas that electrode group bearing of trend is laid in described planar coil, through the first sub-electrode with each electrode in group and the second sub-electrode do not form electrical connection across respectively, and all the other lamettas insulate mutually along electrode group edge and with electrode group and lay.
For reducing lametta layout density between the electrode sets, the organization plan shown in Fig. 5 c can also be adopted, that is: also be deployed in Fig. 5 b within electrode 102 with the part lametta that electrode group is laid with insulating mutually along electrode group edge.Or simpler, electrode 102 is not further subdivided into two sub-electrodes, but be arranged to a complete square-shaped electrode as shown in fig. 4 a like that.In less, each electrode group of the size of display panel number of electrodes less and be used as the sheet resistance of the nesa coating of electrode enough large time, the organization plan that this simplifies can be adopted.In this this structure, branched structure 501 is generally unnecessary.
When the sheet resistance of the nesa coating being used as electrode is very little, for reducing the eddy current that produces of electrode to the image of the sensitivity of electromagnetic detection, the organization plan shown in Fig. 5 d and Fig. 5 e will be better selection.In figure 5d, the electrode 102 of electrode group is divided into mutual insulating and several sub-electrodes corresponding to position on the direction perpendicular with the bearing of trend of electrode group, and is in figure 5d the situation being divided into 502,503,504 and 505 totally 4 sub-electrodes.Lametta 104 is laid along the shape that the bearing of trend of electrode group is elongated planar coil at substrate surface, coil exit is positioned at one end of electrode group, form the trend of lametta with coil of planar coil, the sub-electrode in each electrode according to this from inside to outside or in the through described electrode group in ecto-entad ground forms electrical connection; Remaining lametta substrate surface along electrode or sub-electrode space lay, be generally lay along the outward flange of electrode group, obtain maximum area coil.As in figure 5d, form the sub-electrode 503 and 504 that two through link positions of lametta of inner ring are corresponding, two lamettas of outer ring are through connects corresponding sub-electrode 502 and 505.Certainly can also be divided into more or less sub-electrode, the one that the scheme as electrode being divided in Fig. 5 b two sub-electrodes can regard this scheme as simplifies, and is equivalent to the number of turns of U-shaped one-turn coil to increase but the situation that do not increase of quantity that divides of electrode.In general above-mentioned sub-electrode is not pressed odd number to divide; because press odd number to divide; lametta often can be as shown in Figure 5 a; form the lametta of coil understand some center being positioned at electrode group or near; cause the area of coil to reduce, add the complexity of electrode group structure but the Detection results of not structure as shown in Figure 5 a on the contrary.
The scheme of the eddy current of the transparency electrode of further reduction low square resistance, the structure shown in Fig. 5 e can be used: on the direction identical with the bearing of trend of electrode group, be divided into several sub-electrodes of mutual insulating, in Fig. 5 e, be expressed as the sub-electrode 506,507 and 508 in larger sub-electrode; At this moment the lametta of each sub-electrode of through connection, each sub-electrode in this sub-electrode through, forms electrical connection.
The structure of certain Fig. 5 e also can be combined with the electrode of other structure, as in the structure shown in Fig. 4 a, Fig. 4 b, Fig. 5 c, each electrode or sub-electrode can be divided into several sub-electrodes or sub-electrode in the direction of the extension of electrode group.Be title difference at this sub-electrode or sub-electrode, function is identical.
Because lametta is very thin, for reducing because the open circuit problem that the even trickle fracture of flaw causes appears in lametta inside, improve the yield rate of product, as shown in Fig. 6 a, Fig. 6 b, on the path can laid at described lametta, be laid with the electrically conducting transparent band 601 or 602,603,604 with described electrode same material again, quantity and the position of these conductive strips are set for different electrode structures.Fig. 6 a is for electrode structure comparatively simply as the conductive strips of the vibrational power flow of Fig. 1 or Fig. 4 a, therefore whole electrode 102 only has 601 1; Fig. 6 b is the conductive strips for the more complex vibrational power flow as depicted in fig. 5e of electrode structure, then the sub-electrode forming electrode 102 just can have 602,603,604 totally three.By the electrical connection that lametta and described conductive strips are formed, utilize the flaw of lametta or breakaway poing being linked together of transparent conductive film.Although the resistivity of conductive film is comparatively large, its sectional area relative to lametta is also much bigger, and the gap of flaw or breaking part generally only has several nanometer to tens nanometer, so can to a certain degree make up this defect in some cases.
Be to be understood that; technical scheme of the present invention is not limited to the structure in this specific embodiment; the conversion carrying out being equal in the scope not departing from technological thought of the present invention, transplanting, replacement or deterioration, all belong to the scope of protection of present invention, be as the criterion with scope disclosed in claims.
Claims (13)
1. the two-dimentional touch sensing of a composite structure, include and be attached to some groups of transparency electrodes that transparent substrates is made up of transparent conductive film, that extend along X and Y-direction with pattern form, it is characterized in that: also include at least one lametta described often group in electrode, described lametta forms electrical connection by through for all transparency electrodes in same group together.
2. touch sensing according to claim 1, is characterized in that: described lametta is directly attached to the surface of substrate; Described electrodes is on described substrate and surround described lametta.
3. touch sensing according to claim 1, is characterized in that: described transparency electrode is attached on described substrate; Lametta is attached to the surface of described electrode.
4. touch sensing according to claim 1, is characterized in that: the equivalent width of described lametta is between 2 microns ~ 30 microns.
5. two-dimentional touch sensing according to claim 1, is characterized in that: described lametta to take the shape of the letter U laying along the bearing of trend of electrode group at substrate surface, and one end that the openend of U-shaped is located at electrode group forms two exits of electrode group; In a side arm through connecting electrode group of described U-shaped lametta, each electrode forms electrical connection, and another side arm insulate mutually along electrode group edge and with electrode group and lays.
6. two-dimentional touch sensing according to claim 1, is characterized in that: described lametta is laid along the shape that the bearing of trend of electrode group is elongated planar coil at substrate surface, and the exit of coil is positioned at one end of electrode group; One in described planar coil forms electrical connection along all electrodes in lametta this electrode group through of electrode group bearing of trend laying, and remaining lametta is laid along interelectrode space at substrate surface.
7. touch sensing according to claim 1, is characterized in that: the shape that described lametta takes the shape of the letter U at substrate surface is laid, and the openend of U-shaped is located at one end of electrode group, forms two exits of electrode group; Each electrode in described electrode group is divided into the first sub-electrode and second sub-electrode of mutual insulating on the direction perpendicular with the bearing of trend of electrode group, and through the first sub-electrode with each electrode in group and the second sub-electrode do not form electrical connection to the two-arm of described U-shaped lametta across respectively.
8. touch sensing according to claim 1, is characterized in that: the electrode of described electrode group is divided into several sub-electrodes of mutual insulating on the direction perpendicular with the bearing of trend of electrode group; Described lametta is laid along the shape that the bearing of trend of electrode group is elongated planar coil at substrate surface, coil exit is positioned at one end of electrode group, form the trend of lametta with coil of planar coil, the sub-electrode in each electrode according to this from inside to outside or in the through described electrode group in ecto-entad ground forms electrical connection; Remaining lametta substrate surface along electrode or sub-electrode space lay.
9. touch sensing according to claim 8, is characterized in that: the sub-electrode of electrode in each electrode group of described formation, the direction identical with the bearing of trend of electrode group is divided into several sub-electrodes of mutual insulating; The lametta of the described each sub-electrode of described through connection, through described each sub-electrode forms electrical connection.
10. touch sensing according to claims 1 to 9, it is characterized in that: described lametta has branch's lametta of stretching out to be formed with described electrode in the through part together with each transparency electrode to be electrically connected, the end of described branch lametta does not exceed the edge of electrode that this lametta connects or sub-electrode, sub-electrode.
11. touch sensings according to claims 1 to 9, is characterized in that: on the wiring path of described lametta beyond substrate surface electrode pattern, be also laid with the electrically conducting transparent band with described electrode same material; Described lametta is formed with described conductive strips and is electrically connected.
12., according to the said touch sensing of claim 1 or 5 ~ 9, is characterized in that: the sheet resistance of the transparent conductive film that described electrode uses is preferably between 200 ~ 5000 ohm.
13. touch sensors according to claim 1, is characterized in that: the electrode group of described X and Y-direction and the lametta of each electrode in being connected in X and Y-direction each electrode group, are arranged in respectively on two surfaces being separated by dielectric.
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| CN201310396284.6A CN104298406A (en) | 2013-07-18 | 2013-09-04 | Two-dimensional touch control sensor of combined structure |
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