CN102890573A - ITO (indium tin oxide) touch sensor - Google Patents
ITO (indium tin oxide) touch sensor Download PDFInfo
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- CN102890573A CN102890573A CN2011102033631A CN201110203363A CN102890573A CN 102890573 A CN102890573 A CN 102890573A CN 2011102033631 A CN2011102033631 A CN 2011102033631A CN 201110203363 A CN201110203363 A CN 201110203363A CN 102890573 A CN102890573 A CN 102890573A
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Abstract
The invention relates to an ITO (indium tin oxide) touch sensor. The ITO touch sensor comprises an insulated substrate, an ITO induction layer, an insulated isolation layer and a touch conducting layer, wherein the ITO induction layer is arranged on the insulated substrate and is isolated from the touch conducting layer through the insulated isolation layer; the touch conducting layer and the ITO induction layer generate a contact point at an electric signal loading part when an electric signal is loaded to the touch conducting layer, and the ITO induction layer at a contact point receives and transmits the electric signal. By the technical scheme disclosed by the invention, the touch sensor with a single-layer jumperless ITO structure is achieved; the touch sensor can identify and locate at least two contact points, meanwhile, the fabrication process of the touch sensor is simplified, and the fabrication cost of the touch sensor is also reduced.
Description
Technical field
The present invention relates to the touch sensible field, be specifically related to a kind of ITO touch inductor.
Background technology
Owing to being used at present the ITO(Indium Tin Oxide indium tin metal oxide of multiconductor induction detection technique) touch inductor, realize mainly with capacitive bilayer or individual layer wire jumper ITO structure.Fig. 1 is for being used for the capacitance type ITO structural representation of multiconductor induction detection technique, and for reaching ITO structure shown in Figure 1, wherein to be that ITO with coordinate axis X and Y-direction is divided into two-layer for the double-deck ITO structure of condenser type, middlely separates (as shown in Figure 2) by separation layer; And condenser type individual layer ITO jumper wire construction to be ITO with coordinate axis X and Y-direction be tiled in one deck, middlely connect (as shown in Figure 3) by wire jumper.
Wherein the cost of manufacture alignment precision higher, between layers of the double-deck ITO structure of condenser type is relatively poor, therefore causes the contact accuracy of identification to reduce, and the extremely low power consumption of backlight that will indirectly cause of transmittance increases; And condenser type individual layer wire jumper ITO structure needs very thin wire jumper to connect, and therefore causes the drawbacks such as the difficult wiring of ITO inductor, manufacture difficulty is large, yield rate is low.
Summary of the invention
Technical matters to be solved by this invention provides a kind of ITO touch inductor, not only simplified touch inductor manufacture craft, reduced the cost of manufacture of touch inductor, realized the ITO structure of individual layer without wire jumper, and can identify and locate at least two contacts.
The present invention is in order to solve the problems of the technologies described above, a kind of ITO touch inductor is disclosed, described ITO touch inductor comprises insulated substrate, ITO inductive layer, dielectric isolation layer and touch conducting stratum, wherein, described ITO inductive layer is arranged on the insulated substrate, and isolates by dielectric isolation layer and touch conducting stratum; When having electric signal to be loaded on the touch conducting stratum, described touch conducting stratum and ITO inductive layer can produce contact point in electric signal loading place, and the ITO inductive layer at described contact point place receives and also transmits this electric signal.
Further, a plurality of ITO elementary cells and a plurality of ITO subelement that described ITO inductive layer is made by the ITO material form, and described a plurality of ITO elementary cells are connected by the ITO subelement each other.
Further, described ITO elementary cell is shaped as polygon.
Further, described polygon is regular polygon.
Further, described polygon is irregular polygon.
Further, described polygon is triangle, quadrilateral, hexagon, octagon, circle or oval.
Further, the shape of a plurality of ITO elementary cells of described composition ITO inductive layer is identical.
Further, the shape of a plurality of ITO elementary cells of described composition ITO inductive layer is at least two kinds.
Adopt the beneficial effect of the invention described above technical scheme to be: by adopting individual layer without the touch inductor of wire jumper ITO structure, can identify and locate at least two contacts, technical scheme of the present invention has been simplified the manufacture craft of touch inductor simultaneously, and reduced the error to the touch sensible point location, improved the precision of touch sensible, strengthened the transmittance of touch inductor, indirectly reduced the power consumption of backlight, thereby also reduced the power consumption of touch inductor, and reduced on the whole the cost of manufacture of touch inductor.
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Description of drawings
Fig. 1 is for being used for the capacitance type ITO structural representation of multiconductor induction detection technique;
Fig. 2 is the diagrammatic cross-section of the double-deck ITO structure of condenser type;
Fig. 3 is the diagrammatic cross-section of condenser type individual layer wire jumper ITO structure;
Fig. 4 is the cross-sectional view of ITO touch inductor in the embodiment of the invention;
Fig. 5 A is the diagrammatic cross-section of ITO inductive layer in the embodiment of the invention;
Fig. 5 B is the equivalent RC circuit structure diagram of Fig. 5 A in the embodiment of the invention;
Fig. 6 A is the ITO inductive layer structural representation that is comprised of a plurality of triangle ITO elementary cells in the embodiment of the invention;
Fig. 6 B is the equivalent RC circuit structure diagram of Fig. 6 A in the embodiment of the invention;
Fig. 7 A is the ITO inductive layer structural representation that is comprised of a plurality of quadrilateral ITO elementary cells in the embodiment of the invention;
Fig. 7 B is the equivalent RC circuit structure diagram of Fig. 7 A in the embodiment of the invention;
Fig. 8 A is the ITO inductive layer structural representation that is comprised of a plurality of hexagon ITO elementary cells in the embodiment of the invention;
Fig. 8 B is the equivalent RC circuit structure diagram of Fig. 8 A in the embodiment of the invention;
Fig. 9 is the equivalent RC circuit diagram of ITO inductive layer in the embodiment of the invention;
Figure 10 is the lag characteristic when having or not finger touch on the ITO touch inductor in the embodiment of the invention;
Figure 11 is the fundamental diagram of ITO touch inductor in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used for explaining the present invention, is not be used to limiting scope of the present invention.
One embodiment of the invention discloses a kind of ITO touch inductor, Fig. 4 is the cross-sectional view of ITO touch inductor in the embodiment of the invention, as shown in Figure 4: described ITO touch inductor comprises insulated substrate 401, ITO inductive layer 402, dielectric isolation layer 403 and touches conducting stratum 404, wherein, described ITO inductive layer 402 is arranged on the insulated substrate 401, and isolates by dielectric isolation layer 403 and touch conducting stratum 404.In this embodiment, described insulated substrate 401 adopts transparent hard material usually, such as glass or organic film etc.; Described touch conducting stratum 404 adopts tempered glass or PET (polyethylene terephthalate) etc. mostly, and wherein the advantage of PET is and can accomplishes thinlyyer with touching conducting stratum, and price is also more cheap.
In embodiments of the present invention, a plurality of ITO elementary cells and a plurality of ITO subelement that described ITO inductive layer is made by the ITO material form, ITO(Indium Tin Oxide indium tin metal oxide wherein) be a kind of N-type oxide semiconductor---tin indium oxide, because the resistance characteristic of ITO itself and ITO capacitance characteristic over the ground are (in this embodiment, the resistance characteristic of described ITO refers to the resistivity that ITO material itself has, described ITO capacitance characteristic over the ground refer to ITO and do as a whole formation equivalent capacity, wherein ITO is a pole plate of equivalent capacity, ground is another pole plate of equivalent capacity), therefore a plurality of ITO elementary cells and ITO subelement are mutually arranged and have been formed equivalent RC circuit structure, have avoided thus the complicated technology of metal connecting line and punching.In this embodiment, described ITO inductive layer is comprised of a plurality of ITO elementary cells and a plurality of ITO subelement, and wherein each ITO elementary cell is equivalent to an equivalent capacity over the ground; And a plurality of ITO elementary cells connect by the ITO subelement each other, and described each ITO subelement as line is equivalent to an equivalent resistance.
Basic equivalent relation below in conjunction with accompanying drawing 5A and accompanying drawing 5B explanation ITO inductive layer equivalence RC circuit structure, Fig. 5 A is the diagrammatic cross-section of individual layer ITO inductive layer in the embodiment of the invention, shown in Fig. 5 A: the individual layer ITO inductive layer structure that forms take quadrilateral ITO elementary cell is as example, described individual layer ITO inductive layer 501 is fixed on the insulated substrate 502, in embodiments of the present invention, described individual layer ITO inductive layer 501 is by 4 quadrilateral ITO elementary cell A1, A2, A3, A4 and 4 ITO subelement a1, a2, a3, a4 forms, connect by the ITO subelement between described 4 quadrilateral ITO elementary cells, resistance characteristic and ITO capacitance characteristic over the ground according to ITO material itself, Fig. 5 B is the equivalent RC circuit structure diagram of Fig. 5 A in the embodiment of the invention, shown in Fig. 5 B: as described in 4 quadrilateral ITO elementary cell A1, A2, A3, A4 is equivalent to equivalent capacity C1 over the ground, C2, C3, C4; Because of the resistance characteristic of ITO material itself, ITO subelement a1, a2, a3, the a4 of described connection quadrilateral ITO elementary cell are equivalent to equivalent resistance R1, R2, R3, R4 again; In this embodiment, the material structure of the size of the ITO elementary cell of ITO inductive layer 501 and ITO subelement and insulated substrate 502 has certain relation among the parameter of described equivalent capacity C and equivalent resistance R and the accompanying drawing 5A, and the relation of described correspondence is as follows:
Equivalent resistance: the size (the wide W of ITO elementary cell, long L, thickness d) of the parameter of described equivalent resistance R and ITO elementary cell is relevant with the size (the wide w of ITO subelement, long l) of ITO subelement, and its relational expression is: R=f (W) * f (L) * f (d) * f (w) * f (l);
Equivalent capacity: thickness H, the permittivity of vacuum of the size of the parameter of described equivalent capacity C and ITO elementary cell (the wide W of ITO elementary cell, long L, thickness d) and insulated substrate
, the insulated substrate material specific inductive capacity
Relevant, its relational expression is: C=
* f (W) * f (L) * f (d) * f (H);
In concrete application process, the parameters such as shape that can be by changing individual layer ITO inductive layer structure, size, thickness, perhaps parameters such as the shape by changing the insulated substrate structure, size, thickness are regulated the parameter value of resistance and electric capacity in the corresponding equivalent RC circuit structure.
In the embodiment of the invention, needs in the time of also can using according to reality, the ITO elementary cell is designed to various shape, Fig. 6 A is the ITO inductive layer structural representation that is comprised of a plurality of triangle ITO elementary cells in the embodiment of the invention, as shown in Figure 6A: described ITO inductive layer is comprised of a plurality of triangle ITO elementary cells, and wherein each leg-of-mutton ITO elementary cell is equivalent to equivalent capacity C over the ground; And be connected by the ITO subelement between a plurality of triangle ITO elementary cells, described ITO subelement as line can be the various ways such as straight line, oblique line, broken line; The ITO inductive layer that is comprised of a plurality of triangle ITO elementary cells among Fig. 6 A can equivalence be the RC network structure that is comprised of a plurality of hexagonal RC elementary cells, shown in Fig. 6 B, is the equivalent RC circuit structure diagram of Fig. 6 A in the embodiment of the invention.In this embodiment, the principle of the equivalent RC circuit of the ITO inductive layer that the ITO elementary cell of described various shapes and ITO subelement form is not roughly the same given unnecessary details herein one by one; Be the ITO inductive layer structural representation that is comprised of a plurality of quadrilateral ITO elementary cells in the embodiment of the invention such as Fig. 7 A, in like manner as can be known, Fig. 7 B is the equivalent RC circuit structure diagram of Fig. 7 A in the embodiment of the invention; Be the ITO inductive layer structural representation that is comprised of a plurality of hexagon ITO elementary cells in the embodiment of the invention such as Fig. 8 A, in like manner as can be known, Fig. 8 B is the equivalent RC circuit structure diagram of Fig. 8 A in the embodiment of the invention.
Principle of work below in conjunction with 9～11 pairs of ITO touch inductors of the present invention of accompanying drawing is described in detail: when having electric signal to be loaded on the touch conducting stratum of ITO touch inductor, described touch conducting stratum and ITO inductive layer can produce contact point in electric signal loading place, and described electric signal receives and transmits by the ITO inductive layer at contact point place.
In embodiments of the present invention, resistance characteristic and ITO capacitance characteristic over the ground according to the ITO material, and the equivalence principle by ITO inductive layer and RC circuit structure, utilize " lag characteristic of RC circuit " to describe the principle of work of ITO touch inductor, wherein, the lag characteristic of described ITO inductive layer equivalence RC circuit is as shown in Figure 9: in the RC of Fig. 9 circuit, add pulse signal at input end VIN, because electric capacity is discharged and recharged, exit VOUT can produce retardation Tc to input end VIN, as shown in figure 10, wherein retardation Tc is the function of R and C: Tc=f (R, C).
Figure 11 is the fundamental diagram of ITO touch inductor in the embodiment of the invention, as shown in figure 11, the ITO touch inductor of the ITO inductive layer that forms take quadrilateral ITO elementary cell is as example: because individual layer ITO inductive layer structure can equivalence be the RC circuit structure of correspondence; Its principle of work is, by around exit on the ITO inductive layer, add pumping signal with mode in a certain order, utilize the lag characteristic of its equivalent RC circuit, can produce that corresponding row postpones and row postpone.As shown in figure 10: in a specific embodiment, the high level voltage of supposing pulse is VH, and the threshold value that detects voltage is VTH, VTH=a*VH then, and wherein a is constant (0＜a≤1); Time point when the voltage of input pulse VIN surpasses VTH is made as T0, and the time point the when voltage of corresponding exit VOUT surpasses VTH is made as T1, thus time delay Tc=T1-T0.Again because human body is equivalent to a device that stores electronics, similarly be equivalent to an electric capacity, when user's finger touch during to the touch conducting stratum of ITO touch inductor, cause touching conducting stratum and the ITO inductive layer produces contact point in the touch place, touching simultaneously conducting stratum is added to the electric capacity of human body on the ITO inductive layer by contact point, cause " normally " capacitance field of ITO inductive layer to change, because the contact point that produces during finger touch has changed the electric capacity of the ITO of contact point place elementary cell on the ITO inductive layer, row when therefore having or not finger touch, the row retardation is different, as shown in figure 10: corresponding Tcf=T1f-T0f time delay when finger touch is arranged; And corresponding retardation Tcf also is the function of R and C: Tcf=f (R, C) when finger touch is arranged, and the retardation Tc with without finger touch the time compares, and obtains amount of delay △ T, △ T=Tcf-Tc.In embodiments of the present invention, described exit postpones and the row inhibit signal at the row that finger touch is arranged and produce during without finger touch for pumping signal, formed by △ TDC and register through preprocessing system 802(), calculate finger touch and row postpones and row postpone during without finger touch time difference, convert digital signal to.Namely through △ TDC(Delta-Time-to Digital Converter time data converter) carry out the conversion of digital signal, digital signal after the conversion is stored in the register, be processor through after-treatment system in after-treatment system 803(the present embodiment again), by specific algorithm, finish the positioning function to the contact.
The present embodiment is described single-point in conjunction with the principle of work of above-mentioned ITO touch inductor, response process when 2 and multiple point touching: in embodiments of the present invention, when single finger touch is to the ITO touch inductor, because the inductance capacitance of finger has changed the capacitance of the ITO elementary cell at contact point place on the ITO inductive layer, therefore capable delay output signal and row delay output signal that should contact point be changed thereupon, the signal that ranks postpone is through preprocessing system, the storage of after-treatment system and calculating, obtain the X of this contact point and the coordinate position of Y, thereby realized single-contact location; When having two fingers to touch simultaneously on the ITO touch inductor, because the inductance capacitance of finger has changed the capacitance of the ITO elementary cell at two contact point places on the ITO inductive layer, therefore capable delay output signal and row delay output signal that should two contact points be changed thereupon, the signal that ranks postpone is through storage and the calculating of preprocessing system, after-treatment system, obtain respectively the X of these two contact points and the coordinate position of Y, thereby realized the location to two contacts that touch simultaneously; When having simultaneously a plurality of finger touch to the ITO touch inductor, because the inductance capacitance of finger has changed the capacitance of the ITO elementary cell of a plurality of contact points on the ITO inductive layer, therefore capable delay output signal and row delay output signal that should a plurality of contact points be changed thereupon, the signal that ranks postpone is through storage and the calculating of preprocessing system, after-treatment system, obtain respectively the X of these touch points and the coordinate position of Y, thereby realized the location to a plurality of contacts that touch simultaneously.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. ITO touch inductor, it is characterized in that, described ITO touch inductor comprises insulated substrate, ITO inductive layer, dielectric isolation layer and touch conducting stratum, wherein, described ITO inductive layer is arranged on the insulated substrate, and isolates by dielectric isolation layer and touch conducting stratum; When having electric signal to be loaded on the touch conducting stratum, described touch conducting stratum and ITO inductive layer can produce contact point in electric signal loading place, and the ITO inductive layer at described contact point place receives and also transmits this electric signal.
2. ITO touch inductor according to claim 1 is characterized in that, a plurality of ITO elementary cells and a plurality of ITO subelement that described ITO inductive layer is made by the ITO material form, and described a plurality of ITO elementary cells are connected by the ITO subelement each other.
3. ITO touch inductor according to claim 2 is characterized in that, described ITO elementary cell be shaped as polygon.
4. ITO touch inductor according to claim 3 is characterized in that, described polygon is regular polygon.
5. ITO touch inductor according to claim 3 is characterized in that, described polygon is irregular polygon.
6. ITO touch inductor according to claim 3 is characterized in that, described polygon is triangle, quadrilateral, hexagon, octagon, circle or oval.
7. each described ITO touch inductor is characterized in that according to claim 1～6, and the shape of a plurality of ITO elementary cells of described composition ITO inductive layer is identical.
8. each described ITO touch inductor is characterized in that according to claim 1～6, and the shape of a plurality of ITO elementary cells of described composition ITO inductive layer is at least two kinds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110203363.1A CN102890573B (en) | 2011-07-20 | A kind of ITO touch inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110203363.1A CN102890573B (en) | 2011-07-20 | A kind of ITO touch inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102890573A true CN102890573A (en) | 2013-01-23 |
| CN102890573B CN102890573B (en) | 2016-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103150074A (en) * | 2013-03-18 | 2013-06-12 | 江西合力泰科技股份有限公司 | Manufacture method for realizing integral multi-point touch capacitive screen with mode of filming first and BM second and without bridging |
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| US20100156810A1 (en) * | 2008-12-22 | 2010-06-24 | Fabrice Barbier | Diamond pattern on a single layer |
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| CN201078769Y (en) * | 2007-04-27 | 2008-06-25 | 宸鸿光电科技股份有限公司 | Touch control drawing structure of capacitance type touch control plate |
| US20090109190A1 (en) * | 2007-10-26 | 2009-04-30 | Apple Inc. | Switched capacitor projection scan multi-touch sensor array |
| CN101546241A (en) * | 2008-03-28 | 2009-09-30 | 义隆电子股份有限公司 | Touch control panel device |
| US20090267914A1 (en) * | 2008-04-24 | 2009-10-29 | Leadis Technology, Inc. | Multi-touch touch screen with single-layer ito bars arranged in parallel |
| US20100156810A1 (en) * | 2008-12-22 | 2010-06-24 | Fabrice Barbier | Diamond pattern on a single layer |
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| CN103150074A (en) * | 2013-03-18 | 2013-06-12 | 江西合力泰科技股份有限公司 | Manufacture method for realizing integral multi-point touch capacitive screen with mode of filming first and BM second and without bridging |
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Granted publication date: 20161214 Termination date: 20170720 |