CN102200867B - Capacitance touch induction installation - Google Patents
Capacitance touch induction installation Download PDFInfo
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- CN102200867B CN102200867B CN201010136684.XA CN201010136684A CN102200867B CN 102200867 B CN102200867 B CN 102200867B CN 201010136684 A CN201010136684 A CN 201010136684A CN 102200867 B CN102200867 B CN 102200867B
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Abstract
A kind of capacitance touch induction installation, comprise many drive wires, the line of induction and testing circuit, mutual capacitance is formed between described drive wire and the line of induction, described testing circuit is for detecting the electric signal in the line of induction, the described line of induction comprises first end and the second end and direction along described first end to the second end extends, and first end and second end of the described line of induction are connected to described testing circuit jointly.Present invention reduces the equivalent resistance of the line of induction, improve touch signal accuracy of detection.
Description
Technical field
The present invention relates to touch sensible technology, particularly a kind of capacitance touch induction installation.
Background technology
Touch-screen, as a kind of interface of user interactive, has resistance-type, condenser type, surface acoustic wave type, infrared type etc.In touch screen technology, capacitive touch screen compares resistive touch screen, and to have the life-span long, and transmittance is high, the advantages such as multiple point touching can be supported, it to noise and over the ground stray capacitance have good inhibiting effect, and can multiple point touching be realized, therefore become the main product in touch-screen.
A kind of structure of capacitance touch induction installation as shown in Figure 1, Figure 2 and Figure 3; as shown in Figure 1; the structure of shown capacitance touch induction installation comprises from bottom to up successively: be formed at the drive electrode layer 1 on glass substrate 9, dielectric layer 10, induction electrode layer 2 and protective seam 11.Wherein, drive electrode layer 1 and induction electrode layer 2 are working lining, and its graphic structure generally comprises rhombus electrode as shown in Figures 2 and 3, and this two-layer rhombus electrode intermeshes.
Composition graphs 1 and Fig. 2, drive electrode layer 1 be etched into many drive wire 5a, 5b, 5c ..., 5h, shown in composition graphs 1 and Fig. 3, induction electrode layer 2 be etched into many line of induction 6a, 6b, 6c ..., 6h, wherein, drive electrode layer 1 and induction electrode layer 2 are tin indium oxide (ITO) layer or indium zinc oxide (IZO) layer.Composition graphs 2 and Fig. 3, during work, drive wire 5a to 5h applies drive singal 3 successively, is generally the alternating voltage of tens KHz (KHz) to hundreds of KHz, all the other drive wire ground connection, and the line of induction is connected to the touch control detection circuit 18 detecting touching signals by gating switch 17.For example, first turntable driving line 5a, namely on drive wire 5a, drive singal 3 is applied, all the other drive wires 5b, 5c ..., 5h ground connection 4, now line of induction 6a is connected with touch control detection circuit 18 by gating switch 17, that namely detect is drive wire 5a and line of induction 6a, when finger touch can detect touching signals in the point of intersection of these two lines; Then, gating switch 17 more successively by line of induction 6b, 6c ..., 6h is connected with touch control detection circuit 18, detect respectively drive wire 5a with line of induction 6b, 6c ..., 6h point of intersection touching signals.After the scanning process of drive wire 5a terminates, turntable driving line 5b, by drive wire 5b connect driving voltage 3, all the other drive wires 5a, 5c ..., 5h ground connection 4, gating switch 17 more successively by line of induction 6a, 6b, 6c ..., 6h is connected with touch control detection circuit 18.Successively turntable driving line 5a, 5b, 5c ..., 5h completes scanning process, just can detect whether all point of intersection of all drive wires and all lines of induction have touching signals.
The equivalent electrical circuit of the drive wire of each shown in Fig. 2 and Fig. 3 and the point of intersection of the line of induction is as shown in Figure 4: each point of intersection is equivalent to the mutual capacitance 23 that has been coupled, for drive wire and the line of induction just to overlapping place formed just to the edge capacitance sum that pattern edge on pattern edge on electric capacity and drive wire and the line of induction is formed; Resistance 22 is equivalent resistances of drive wire, and resistance 25 is equivalent resistances of the line of induction; Drive wire and the line of induction have stray capacitance 24 over the ground respectively; Driving source 21 is for generation of described drive singal 3; Touch control detection circuit 18 is amplifiers, the transform electrical signals on the line of induction is become voltage signal Vout and exports.When finger touch, can be understood as finger and taken a bridge between the drive wire and the line of induction of touch point, to be equivalent in mutual capacitance 23 electric capacity in parallel, thus mutual capacitance 23 equivalence is increased, cause the electric signal on the line of induction to change, thus make output voltage Vout change.
In equivalent electrical circuit shown in Fig. 4, line of induction resistance 25 can affect the size of the voltage signal Vout that touch control detection circuit 18 produces, and the resistance of resistance 25 is less, and the voltage signal Vout obtained is larger, the signal to noise ratio (S/N ratio) of corresponding touch signal is larger, and the accuracy of detection of touch signal is higher.Although the live width and the thickness that increase the line of induction can reduce resistance, increase live width can increase stray capacitance simultaneously, affect signal to noise ratio (S/N ratio); Increase the restriction that thickness is then subject to technological level.Application number is the capacitive touch control plate disclosing a kind of low impedance structure in the Chinese patent application of 200710180736.1, the line of induction is divided and is cut to two parts, the equivalent resistance of every part is less than the resistance of the whole piece line of induction before cutting, and reduces the equivalent resistance of the line of induction with this.But the incision that in the program, the line of induction is cut exists gap, when this Trackpad is used for touching display screen, the homogeneity of display brightness can be affected.
Prior art also comprises another kind of capacitance touch induction installation, its structure as shown in Figure 5, for single layer structure, drive wire and the line of induction, all at same working lining, form matrix structure at drive electrode 20a, 20b, 20c, 20d, 20e, 20f and the mutual capacitance that formed between the line of induction 21a, 21b, 21c.Specifically, drive electrode 20a, 20b, 20c, 20d, 20e, 20f are matrix arrangement, and the line of induction 21a, 21b, 21c are arranged between two row drive electrodes; Drive electrode 20a, 20b, 20c, 20d, 20e, 20f are connected to together in outer peripheral areas, form drive wire; One end of the line of induction 21a, 21b, 21c is connected to testing circuit 21 in outer peripheral areas.Wherein, each drive electrode and induction electrode form mutual capacitance, and the equivalent electrical circuit between each drive electrode with induction electrode shown in Fig. 5 is same as shown in Figure 4.It is comparatively large equally to there is line of induction equivalent resistance in the touch induction device shown in Fig. 5, affects the problem of touch signal accuracy of detection.
Summary of the invention
The problem that the present invention solves is to provide a kind of capacitance touch induction installation, to reduce the equivalent resistance of the line of induction, improves touch signal accuracy of detection.
For solving the problem, the invention provides a kind of capacitance touch induction installation, comprise many drive wires, the line of induction and testing circuit, mutual capacitance is formed between described drive wire and the line of induction, described testing circuit is for detecting the electric signal in the line of induction, the described line of induction comprises first end and the second end and direction along described first end to the second end extends, and first end and second end of the described line of induction are connected to described testing circuit jointly.
Optionally, the bearing of trend of described drive wire and the bearing of trend of the described line of induction mutually vertical.
Optionally, described drive wire and the line of induction are formed in drive electrode layer and induction electrode layer respectively, and are formed with dielectric layer between described drive electrode layer and induction electrode layer.
Optionally, described drive wire comprises multiple first figure and the first connecting portion being connected described first figure, the described line of induction comprises multiple second graph and the second connecting portion being connected described second graph, described second connecting portion and the first connecting portion are just to overlapping, and described second graph and the first figure stagger mutually.
Optionally, described dielectric layer comprises first medium layer, second dielectric layer and the screen layer between described first medium layer and second dielectric layer.
Optionally, described drive wire and the line of induction are formed at same electrode layer.
Optionally, described drive wire comprises multiple drive electrode and the drive electrode of many drive wires is matrix arrangement, and the described line of induction is arranged between two row cutting electrodes.
Optionally, the drive electrode being arranged in same drive wire is electrically connected to each other.
Optionally, shielding line is formed with between described drive electrode and the line of induction.
Optionally, the first end of the described line of induction and the second end are connected to described testing circuit by printed circuit board (PCB) or flexible PCB.
Compared with prior art, technique scheme has the following advantages:
Technical solution of the present invention is by being jointly connected to testing circuit by the first end of the line of induction and the second end, thus make touch signal can transfer to testing circuit by shortest path, because this reducing the equivalent resistance of the line of induction, improve the accuracy of detection of touch signal.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of a kind of capacitance touch induction installation of prior art;
Fig. 2 and Fig. 3 is the structural representation of drive wire in structure shown in Fig. 1 and the line of induction;
Fig. 4 is the schematic equivalent circuit of the drive wire of capacitance touch induction installation and the point of intersection of the line of induction;
Fig. 5 is the another kind of drive wire of capacitance touch induction installation and the structural representation of the line of induction of prior art;
Fig. 6 is the cross-sectional view of a kind of capacitance touch induction installation of the embodiment of the present invention;
Fig. 7 and Fig. 8 is the partial structurtes schematic diagram of drive wire in structure shown in Fig. 6 and the line of induction;
Fig. 9 is the syndeton schematic diagram of the line of induction in structure shown in Fig. 6 and testing circuit;
Figure 10 is the another kind of drive wire of capacitance touch induction installation and the structural representation of the line of induction of the embodiment of the present invention;
Figure 11 is the drive wire of another capacitance touch induction installation and the structural representation of the line of induction of the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
In capacitance touch induction installation, the equivalent resistance of the line of induction can affect the size of the electric signal transferring to testing circuit, and then affects the size of signal to noise ratio (S/N ratio) of the signal that testing circuit receives, thus affects the accuracy of detection of touch signal.Along with the area of the touch display screen using capacitance touch technology is increasing, make the length of the line of induction also corresponding longer, cause its equivalent resistance comparatively large, have impact on the accuracy of detection of touch signal.Be cut to two parts by being divided by the line of induction in prior art, two parts are connected to testing circuit respectively, thus reduce the independent equivalent resistance of every a part of line of induction.But the space that the program is formed after cutting the line of induction can affect the brightness uniformity of touch display screen.
Inventor finds through research, one end of the line of induction is only connected to testing circuit by prior art, along with line of induction length increases with the area increase of touch display screen, the equivalent resistance of the line of induction is increased, wherein worst situation is that one end of the line of induction detects touch signal, but corresponding electric signal needs to flow through the whole piece line of induction and detects with the testing circuit transferring to the relative other end of the line of induction, make the resistance value of the line of induction resistance 25 in the equivalent electrical circuit shown in Fig. 4 excessive, have a strong impact on the accuracy of detection of touch signal.The two ends of the line of induction are connected to testing circuit by technical scheme of the present invention jointly, then touch signal can pass through shortest path (namely by the relatively near one end of distance testing circuit) and transfers to testing circuit, thus reduce the equivalent resistance of the line of induction, improve the accuracy of detection of touch signal.
Fig. 6 shows the cross-sectional view of a kind of capacitance touch induction installation of the embodiment of the present invention; as shown in Figure 6; this structure comprises from bottom to up successively: be formed at the drive electrode layer 31 on glass substrate 30, dielectric layer 32, induction electrode layer 33 and protective seam 34.Wherein drive electrode layer 31 and induction electrode layer 33 can be ITO layer or IZO layer; Described dielectric layer 32 is transparent dielectric layer.
In other embodiments of the invention, described dielectric layer 32 can also be the sandwich construction of compound, comprises first medium layer, second dielectric layer and the screen layer (not shown) between first medium layer and second dielectric layer.Described first medium layer, second dielectric layer are transparent dielectric layer, described screen layer can be ITO layer or IZO layer, for reducing the mutual capacitance between drive electrode in described drive electrode layer 31 and induction electrode layer 33 and induction electrode, improve touch signal accuracy of detection.
Concrete, as shown in Figure 7, many the drive wires be parallel to each other (being vertical direction in Fig. 7) are formed in described drive electrode layer 31, described drive wire comprises multiple first figure 31a and the first connecting portion 31b being connected described first figure 31a, described in the present embodiment, the shape of the first figure 31a is rhombus, can also be other polygons in other embodiments of the invention, as rectangle or hexagon etc.
Concrete, as shown in Figure 8, be formed with described drive wire orthogonal many lines of induction (being horizontal direction in Fig. 8) in described induction electrode layer 32, be parallel to each other between the described line of induction.The described line of induction comprises multiple second graph 32a and the second connecting portion 32b being connected described second graph 32a, the shape of the 32a of second graph described in the present embodiment is rhombus, can also be other polygons in other embodiments of the invention, as rectangle or hexagon etc.Described second graph 32a and described first figure 31a staggers mutually, and the second connecting portion 32b and described first connecting portion 31b is just to overlapping.
Fig. 9 shows the line of induction of this enforcement and the syndeton of testing circuit, as shown in Figure 9, many line of induction 8a, 8b,, 8h comprises first end and the second end respectively, and wherein every bar line of induction extends along the direction of described first end to the second end, described first end and the second end are connected to testing circuit 35 jointly, and wherein said testing circuit 35 comprises gating switch 35a and touch control detection circuit 35b.In one embodiment, described first end and the second end can pass through printed circuit board (PCB) (PCB) or flexible PCB (FPC) is connected to described testing circuit 35, namely the described line of induction outer peripheral areas cabling and be connected on PCB or FPC, and on PCB or FPC, described first end and the second end are connected to described testing circuit 35.
In concrete touch signal testing process, first scan a certain drive wire, the first end of line of induction 8a and the second end are connected to touch control detection circuit 35b by gating switch 35a jointly, namely detect this drive wire and whether line of induction 8a is touched at point of crossing place; Afterwards, gating switch 35b again by line of induction 8b, 8c ..., 8h is connected with touch control detection circuit 35b, detect respectively this drive wire and line of induction 8b, 8c ..., 8h point of crossing place touch signal, again above-mentioned testing process is carried out to next drive wire after detection completes, thus complete all drive wires and whether line of induction point of crossing place exists touch action.
Owing to the two ends (first end and the second end) of the line of induction being connected to described testing circuit 35 jointly in the technical scheme of this enforcement, when there is touch action, corresponding electric signal can transfer to testing circuit 35 by shortest path.Most harsh conditions is that the midpoint of the line of induction exists touch action, and the length of the transmission path of corresponding electric signal is the half of the length of the described line of induction, therefore effectively reduces the equivalent resistance of the line of induction, improves the accuracy of detection of touch signal.Further, compared with the technical scheme mentioned in background technology, there is not the breach of cutting the line of induction and causing in the line of induction of the technical program, can not affect the brightness uniformity of touch display screen.
Figure 10 shows the another kind of drive wire of capacitance touch induction installation and the structural representation of the line of induction of the embodiment of the present invention, and in this structure, the line of induction and drive wire are formed in same electrode layer.As shown in Figure 10, comprise drive wire 36a, 36b ... 36f, line of induction 37a, 37b, 37c, wherein drive wire comprises multiple drive electrode, and the shape of drive electrode described in the present embodiment is rectangle, and the drive electrode being arranged in same drive wire is electrically connected to each other.Wherein, the drive electrode of described many drive wires is matrix arrangement, and the described line of induction is arranged between two row cutting electrodes.The touch signal testing process of the capacitance touch induction installation in the present embodiment is similar to the above embodiments, just repeats no more here.Because the first end of the line of induction in the technical program and the second end are connected to testing circuit 37 jointly, make the equivalent resistance of the line of induction less, improve the accuracy of detection of touch signal.
It should be noted that, drive wire described in the present embodiment is that vertical direction is arranged, the line of induction is arranged in horizontal direction, in an embodiment of the present invention, described drive wire also can be arranged in horizontal direction, and the line of induction is vertical direction setting, in the case, the line of induction is arranged between two row drive electrodes.In addition, described drive wire and the line of induction can also the arrangements in other directions under prerequisite vertical each other.
Figure 11 shows the another kind of drive wire of capacitance touch induction installation and the structural representation of the line of induction of the embodiment of the present invention, this structure and the structure shown in Figure 10 basically identical, comprise many drive wire 38a, 38b ... 38f and many line of induction 39a, 39b, 39c, difference is also to comprise many shielding lines 40 between the drive electrode and the line of induction of each row, to reduce the mutual capacitance between described drive wire and the line of induction, improve the accuracy of detection of touch signal.Similar with the capacitance touch induction installation shown in Figure 10, the two ends of the line of induction are connected to testing circuit 39 jointly.In addition, with the similar in Fig. 9, two ends also can be connected to testing circuit by PCB or FPC by the line of induction of the capacitance touch induction installation shown in Figure 10 and Figure 11 jointly.
It should be noted that, arragement direction and the quantity of the drive wire shown in Fig. 9, Figure 10 and Figure 11 and the line of induction are only example, can adjust according to demand in actual applications.In addition, capacitance touch induction installation described in above-described embodiment can be used alone in a particular application, as the pick-up unit of touch action, also can combine with display panels (LCD), to process accordingly according to touch action as touch display screen and show.
To sum up, the two ends of the line of induction are connected to testing circuit by capacitance touch induction installation in technical solution of the present invention jointly, thus effectively reduce the equivalent resistance of the line of induction, improve the accuracy of detection of touch signal.Meanwhile, compared with prior art, there is not the gap of cutting the line of induction and causing in the technical program, the homogeneity of display brightness can not be affected.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (5)
1. a capacitance touch induction installation, comprise many drive wires, the line of induction and testing circuit, mutual capacitance is formed between described drive wire and the line of induction, described testing circuit is for detecting the electric signal in the line of induction, the described line of induction comprises first end and the second end and direction along described first end to the second end extends, it is characterized in that, first end and second end of the described line of induction are connected to described testing circuit jointly;
Wherein, first end and second end of the described line of induction are connected to described testing circuit jointly, comprising:
Draw one end after the first end of the described line of induction is connected with the second end and be connected to described testing circuit;
Described drive wire and the line of induction are formed in drive electrode layer and induction electrode layer respectively, and are formed with dielectric layer between described drive electrode layer and induction electrode layer;
Described dielectric layer comprises first medium layer, second dielectric layer and the screen layer between described first medium layer and second dielectric layer.
2. capacitance touch induction installation as claimed in claim 1, it is characterized in that, the bearing of trend of described drive wire is mutually vertical with the bearing of trend of the described line of induction.
3. capacitance touch induction installation as claimed in claim 1, it is characterized in that, described drive wire comprises multiple first figure and the first connecting portion being connected described first figure, the described line of induction comprises multiple second graph and the second connecting portion being connected described second graph, described second connecting portion and the first connecting portion are just to overlapping, and described second graph and the first figure stagger mutually.
4. a capacitance touch induction installation, comprise many drive wires, the line of induction and testing circuit, mutual capacitance is formed between described drive wire and the line of induction, described testing circuit is for detecting the electric signal in the line of induction, the described line of induction comprises first end and the second end and direction along described first end to the second end extends, it is characterized in that, first end and second end of the described line of induction are connected to described testing circuit jointly;
Wherein, first end and second end of the described line of induction are connected to described testing circuit jointly, comprising:
Draw one end after the first end of the described line of induction is connected with the second end and be connected to described testing circuit;
Described drive wire and the line of induction are formed at same electrode layer; Described drive wire comprises multiple drive electrode and the drive electrode of many drive wires is matrix arrangement, and the described line of induction is arranged between two row cutting electrodes;
The drive electrode being arranged in same drive wire is electrically connected to each other;
Shielding line is formed between described drive electrode and the line of induction.
5. the capacitance touch induction installation according to any one of Claims 1-4, is characterized in that, first end and second end of the described line of induction are connected to described testing circuit by printed circuit board (PCB) or flexible PCB.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010136684.XA CN102200867B (en) | 2010-03-24 | 2010-03-24 | Capacitance touch induction installation |
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| CN201010136684.XA CN102200867B (en) | 2010-03-24 | 2010-03-24 | Capacitance touch induction installation |
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| CN102200867A CN102200867A (en) | 2011-09-28 |
| CN102200867B true CN102200867B (en) | 2016-03-30 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508588A (en) * | 2011-11-22 | 2012-06-20 | 汕头超声显示器（二厂）有限公司 | Dielectric-filled capacitive touch panel and manufacturing method thereof |
| CN103383612B (en) * | 2012-05-02 | 2016-05-18 | 嘉善凯诺电子有限公司 | Selfcapacity type contactor control device and its method of operating |
| CN102931967B (en) * | 2012-11-09 | 2015-03-11 | 烟台正海科技有限公司 | Key wiring for capacitive touch screen |
| KR102112092B1 (en) * | 2013-12-31 | 2020-05-19 | 엘지디스플레이 주식회사 | Touch sensing system |
| CN104375730A (en) * | 2014-11-26 | 2015-02-25 | 深圳市华星光电技术有限公司 | Touch panel and touch display device |
| TWI543059B (en) * | 2014-12-31 | 2016-07-21 | 義隆電子股份有限公司 | Capacitive touch panel |
| CN104714327A (en) * | 2015-03-30 | 2015-06-17 | 深圳市华星光电技术有限公司 | Touch liquid crystal display panel and touch liquid crystal display device |
| CN106293203A (en) * | 2016-07-29 | 2017-01-04 | 京东方科技集团股份有限公司 | Touch electrode structure, its open circuit short circuit test method, touch screen and display device |
| KR20210086283A (en) * | 2019-12-31 | 2021-07-08 | 엘지디스플레이 주식회사 | In-cell Touch Organic Light Emitting Diode Display Device and Testing method thereof |
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| KR100885730B1 (en) * | 2007-03-05 | 2009-02-26 | (주)멜파스 | Touch location sensing pannel having a simple layer structure |
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