CN202815802U - Capacitive touch screen - Google Patents
Capacitive touch screen Download PDFInfo
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- CN202815802U CN202815802U CN 201220467887 CN201220467887U CN202815802U CN 202815802 U CN202815802 U CN 202815802U CN 201220467887 CN201220467887 CN 201220467887 CN 201220467887 U CN201220467887 U CN 201220467887U CN 202815802 U CN202815802 U CN 202815802U
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Abstract
The utility model discloses a capacitive touch screen, which comprises a flexible circuit board and a transparent touch sensing layer, wherein the end parts of the flexible circuit board and the transparent touch sensing layer are connected; the transparent touch sensing layer comprises a plurality of uniformly arranged electrodes; the electrodes are electrically connected with a corresponding connecting end of the flexible circuit board respectively and comprise a plurality of first and second electrodes; each first electrode is simultaneously perpendicular to each second electrode; the first and second electrodes consist of a plurality of first and second sensing units which are connected in series in sequence through corresponding first and second transparent conducting wires; the first and second sensing units are transverse H-shaped sensing units; each transverse H-shaped sensing unit consists of a first straight strip, a third straight strip and a second straight strip; the first straight strip and the third straight strip are parallel to each other; the second straight strip is perpendicular to the first straight strip and the third straight strip; and the two ends of the second straight strip are connected with central parts of the first straight strip and the third straight strip respectively. The capacitive touch screen has the advantages of good anti-interference capacity, high touch sensitivity and the like.
Description
Technical field
The utility model relates to a kind of touch-screen, is specifically related to a kind of capacitive touch screen, belongs to the touch screen technology field.
Background technology
Existing touch-screen is widely used on the electronic device terminals such as game machine, mobile phone, GPS as input equipment, and described touch-screen comprises infrared-type touch-screen, surface acoustic wave touch screen, resistive touch screen and capacitive touch screen.Existing capacitive touch screen is that the capacitance difference that produces when utilizing human body contact conductive film checks touch location, realized multi-point touch and convenient operation amplification, dwindle, spinfunction, therefore favored by people.The sensing unit that the electrode that existing capacitive touch screen comprises has mostly is rhombus, cruciform, triangle, rectangle or hexagonal sensing unit are also arranged certainly, the bad situation of homogeneity and consistance can appear in the sensing unit of above-mentioned shape in use, has the shortcomings such as poor anti jamming capability, touch-control sensitivity be low.
Summary of the invention
The purpose of this utility model is: the capacitive touch screen that a kind of not only antijamming capability is good but also touch-control is highly sensitive is provided.
In order to achieve the above object, the technical solution of the utility model is: a kind of capacitive touch screen, comprise flexible PCB and transparent touch inductive layer, described flexible PCB is connected with the end of transparent touch inductive layer, described transparent touch inductive layer comprises the electrode that several are evenly arranged, and several electrodes that are evenly arranged are electrically connected with the corresponding link of flexible PCB respectively; Its improvement is:
A, described electrode comprise several along Width and the first electrode that is evenly arranged and several alongst and the second electrode that is evenly arranged, and each first electrode is simultaneously mutually vertical with each second electrode;
B, described the first electrode are followed in series to form by the first electrically conducting transparent line by several first sensing units;
C, described the second electrode are followed in series to form by the second electrically conducting transparent line by several second sensing units;
D, described the first sensing unit and the second sensing unit all are sensing units of I shape shape;
The sensing unit of e, described I shape shape is by the first vertical bar parallel to each other and the 3rd vertical bar, and consist of perpendicular to the second vertical bar of the first vertical bar and the 3rd vertical bar, and the two ends of the second vertical bar are connected with the central part of the first vertical bar and the central part of the 3rd vertical bar respectively.
In technique scheme, described transparent touch inductive layer outside surface also is compounded with protective seam, and protective seam and transparent touch inductive layer are bonding.
In technique scheme, described transparent touch inductive layer also comprises the first transparent insulation base material, and the first nesa coating of being provided with of the one side of the first transparent insulation base material; Described several along Width and the first electrode of being evenly arranged and several alongst and the second electrode that is evenly arranged all be located on the outside surface of the first nesa coating.
In technique scheme, described transparent touch inductive layer also comprises the second transparent insulation base material, and the two sides of the second transparent insulation base material the second nesa coating and the 3rd nesa coating that are respectively equipped with; Described several all are located on the outside surface of the second nesa coating along Width and the first electrode of being evenly arranged, described several alongst and the second electrode that is evenly arranged all be located on the outside surface of the 3rd nesa coating.
In technique scheme, described transparent touch inductive layer also comprises the 4th transparent insulation base material and the 5th transparent insulation base material, and the 5th nesa coating that is provided with of the one side of the 4th nesa coating that is provided with of the one side of the 4th transparent insulation base material and the 5th transparent insulation base material; Described several all are located on the outside surface of the 4th nesa coating along Width and the first electrode of being evenly arranged, described several alongst and the second electrode that is evenly arranged all be located on the outside surface of the 5th nesa coating; Described the 4th transparent insulation base material, the 4th nesa coating, the first electrode and the 5th transparent insulation base material, the 5th nesa coating, the second electrode are bonded as one.
In technique scheme, described the first electrically conducting transparent line is that the I shape central axis along the first electrode is connected; The second electrically conducting transparent line is that the I shape central axis along the second electrode is connected; Described the first electrically conducting transparent line is mutually vertical with the second electrically conducting transparent line, and the mid point a of the first electrically conducting transparent line
0Mid point b with the second electrically conducting transparent line
0Line a
0b
0, both perpendicular to the first electrically conducting transparent line, again perpendicular to the second electrically conducting transparent line.
In technique scheme, the width L ' of the second sensing unit of the I shape shape of the width L of the first sensing unit of the I shape shape of described the first electrode and the ratio of length H and the second electrode and being in equal proportions of length H '.
In technique scheme, the spacing between the first adjacent sensing unit of described the first electrode equates with spacing between the second adjacent sensing unit of the second electrode.
In technique scheme, the width L of the first sensing unit of the I shape shape of described the first electrode and the ratio of length H are 0.5 ~ 2; The width L ' of the second sensing unit of the I shape shape of described the second electrode is 0.5 ~ 2 with the ratio of length H '.
In technique scheme, the spacing between the first adjacent sensing unit of described the first electrode is 4 ~ 10mm; Spacing between the second adjacent sensing unit of described the second electrode is 4 ~ 10mm.
In technique scheme, described the 4th transparent insulation base material and the 5th transparent insulation base material or be all the transparent membrane base material perhaps are all clear glass substrate; Perhaps the 4th transparent insulation base material is the transparent membrane base material, and the 5th transparent insulation base material is clear glass substrate.
In technique scheme, the 5th nesa coating of the 4th nesa coating of described the 4th transparent insulation base material and the 5th transparent insulation base material in opposite directions, perhaps is reverse perhaps in the same way.
In technique scheme; described flexible PCB comprises MCU controller, filtering circuit, power protecting circuit and connector; several first electrodes and several second electrodes are electrically connected with the corresponding link of MCU controller respectively; the MCU controller is electrically connected with filtering circuit and the corresponding link of connector respectively, and described MCU controller also is electrically connected with the corresponding link of power protecting circuit respectively with connector.
The good effect that the utility model has is: because sensing unit of the present utility model has adopted the sensing unit of I shape shape, and the both sides area of the sensing unit of I shape shape is larger, and each first electrode is simultaneously mutually vertical with each second electrode, so that the overlapping area of the first electrode and the second electrode is minimum; When touch-control capacitive touch screen of the present utility model, the transparent touch inductive layer can form electrostatic field, namely when user's multi-point touch, the first sensing unit by detecting several the first electrodes that are evenly arranged along Width respectively with the second sensing unit of the second electrode that alongst is evenly arranged accordingly, the variation of the coupling capacitance of square crossing place is identified user's position of touch with this mutually; If during finger touch, then coupling capacitance also can reduce, if when pointing even move left and right, then finger can be realized reducing uniformly or increasing with the contact area of the sensing unit of I shape shape, reached the purpose of contact area even variation, so that the accuracy of position of touch identification is high; Thereby electric field resistance of the present utility model is more even, has the strong and highly sensitive advantage of touch-control of antijamming capability.
Description of drawings
Fig. 1 is the structural representation of a kind of capacitive touch screen embodiment of the present utility model;
Fig. 2 is the A-A direction cross-sectional schematic among Fig. 1;
Fig. 3 is the first structural representation of the transparent touch inductive layer of Fig. 1;
Fig. 4 is the first electrode of the present utility model and the arrange synoptic diagram of the second electrode on nesa coating;
Fig. 5 is the structural representation of the first electrode among Fig. 1;
Fig. 6 is the structural representation of the second electrode among Fig. 1;
Fig. 7 is the structural representation of the sensing unit of I shape shape of the present utility model;
Fig. 8 is the I section enlarged diagram among Fig. 4;
Fig. 9 is the B section enlarged diagram among Fig. 4;
Figure 10 is the second structural representation of the utility model transparent touch inductive layer;
Figure 11 is the third structural representation of the utility model transparent touch inductive layer;
Figure 12 is the 4th kind of structural representation of the utility model transparent touch inductive layer;
Figure 13 is the 5th kind of structural representation of the utility model transparent touch inductive layer;
Figure 14 is the 6th kind of structural representation of the utility model transparent touch inductive layer;
Figure 15 is the circuit theory block diagram of a kind of flexible PCB of the present utility model;
Mathematics parabola model figure when Figure 16 is capacitive touch screen touch-control of the present utility model;
Figure 17 is that synoptic diagram is arranged in the space of the first electrically conducting transparent line of the present utility model and the second electrically conducting transparent DNA mitochondrial DNA.
Embodiment
Below in conjunction with accompanying drawing and the embodiment that provides the utility model is further described.
Shown in Fig. 1,2,3,4,5,6,7,8,9, a kind of capacitive touch screen, comprise flexible PCB 1 and transparent touch inductive layer 2, described flexible PCB 1 is connected with the end of transparent touch inductive layer 2, (be that flexible PCB 1 is bonding by the end of different side's conducting resinl and transparent touch inductive layer 2,) described transparent touch inductive layer 2 comprises several electrodes that is evenly arranged 3, and several electrodes that are evenly arranged 3 are electrically connected with the corresponding link of flexible PCB 1 by silver slurry line respectively; Described electrode 3 comprises several along Width and the first electrode 3-1 of being evenly arranged and several alongst and the second electrode 3-2 that is evenly arranged, and each first electrode 3-1 is simultaneously mutually vertical with each second electrode 3-2; Described the first electrode 3-1 is followed in series to form by the first electrically conducting transparent line 3a by several first sensing units 3-1-1; Described the second electrode 3-2 is followed in series to form by the second electrically conducting transparent line 3b by several second sensing units 3-2-1; Described the first sensing unit 3-1-1 and the second sensing unit 3-2-1 all are sensing units of I shape shape; The sensing unit of described I shape shape is by the first vertical bar 31 parallel to each other and the 3rd vertical bar 33, and consist of perpendicular to the second vertical bar 32 of the first vertical bar 31 and the 3rd vertical bar 33, and the two ends of the second vertical bar 32 are connected with the central part of the first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
As shown in Figure 1, 2, in order to play a protective role to transparent touch inductive layer 2, prevent that transparent touch inductive layer 2 from damage having occured, described transparent touch inductive layer 2 outside surfaces also are compounded with protective seam 10, and protective seam 10 is bonding with transparent touch inductive layer 2.Protective seam 10 of the present utility model is tempered glass, and tempered glass protective seam 10 is bonding by optical cement and transparent touch inductive layer 2.
Shown in Fig. 3,4,5,6, described transparent touch inductive layer 2 also comprises the first transparent insulation base material 5, and the first nesa coating 4 of being provided with of the one side of the first transparent insulation base material 5; Described several along Width and the first electrode 3-1 of being evenly arranged and several alongst and the second electrode 3-2 that is evenly arranged all be located on the outside surface of the first nesa coating 4.
Shown in Fig. 4,5,6,8,9,17, for so that structure of the present utility model is more reasonable, described the first electrically conducting transparent line 3a is that the I shape central axis along the first electrode 3-1 is connected; The second electrically conducting transparent line 3b is that the I shape central axis along the second electrode 3-2 is connected; Described the first electrically conducting transparent line 3a is mutually vertical with the second electrically conducting transparent line 3b, and the mid point a of the first electrically conducting transparent line 3a
0Mid point b with the second electrically conducting transparent line 3b
0Line a
0b
0, both perpendicular to the first electrically conducting transparent line 3a, again perpendicular to the second electrically conducting transparent line 3b.The first electrically conducting transparent line 3a of the present utility model and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Shown in Fig. 8,9, for so that the rationality of the utility model structure, and the homogeneity that guarantees electric field resistance between the adjacent sensing unit, the second width L ' of sensing unit 3-2-1 of the I shape shape of the width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H and the second electrode 3-2 and being in equal proportions of length H '.The width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 of the I shape shape of described the second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Shown in Fig. 4,5,6, in order further to improve the homogeneity of electric field resistance between the adjacent sensing unit, the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 equates with spacing between the second adjacent sensing unit 3-2-1 of the second electrode 3-2.Spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of described the second electrode 3-2 is 4 ~ 10mm.
The first transparent insulation base material 5 among the embodiment 1 is transparent membrane base materials or is clear glass substrate; Described the first nesa coating 4 is indium tin oxide conductive films, certainly, also can be the graphene conductive film, or the antimony tin conducting film.
Shown in Fig. 1,2,4,5,6,7,8,9,10, a kind of capacitive touch screen, comprise flexible PCB 1 and transparent touch inductive layer 2, described flexible PCB 1 is connected with the end of transparent touch inductive layer 2, (be that flexible PCB 1 is bonding by the end of different side's conducting resinl and transparent touch inductive layer 2,) described transparent touch inductive layer 2 comprises several electrodes that is evenly arranged 3, and several electrodes that are evenly arranged 3 are electrically connected with the corresponding link of flexible PCB 1 by silver slurry line respectively; Described electrode 3 comprises several along Width and the first electrode 3-1 of being evenly arranged and several alongst and the second electrode 3-2 that is evenly arranged, and each first electrode 3-1 is simultaneously mutually vertical with each second electrode 3-2; Described the first electrode 3-1 is followed in series to form by the first electrically conducting transparent line 3a by several first sensing units 3-1-1; Described the second electrode 3-2 is followed in series to form by the second electrically conducting transparent line 3b by several second sensing units 3-2-1; Described the first sensing unit 3-1-1 and the second sensing unit 3-2-1 all are sensing units of I shape shape; The sensing unit of described I shape shape is by the first vertical bar 31 parallel to each other and the 3rd vertical bar 33, and consist of perpendicular to the second vertical bar 32 of the first vertical bar 31 and the 3rd vertical bar 33, and the two ends of the second vertical bar 32 are connected with the central part of the first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
As shown in Figure 1, 2, in order to play a protective role to transparent touch inductive layer 2, prevent that transparent touch inductive layer 2 from damage having occured, described transparent touch inductive layer 2 outside surfaces also are compounded with protective seam 10, and protective seam 10 is bonding with transparent touch inductive layer 2.Protective seam 10 of the present utility model is tempered glass, and tempered glass protective seam 10 is bonding by optical cement and transparent touch inductive layer 2.
Shown in Fig. 4,5,6,10, described transparent touch inductive layer 2 also comprises the second transparent insulation base material 6, and the two sides of the second transparent insulation base material 6 the second nesa coating 7 and the 3rd nesa coating 7 ' that are respectively equipped with; Described several all are located on the outside surface of the second nesa coating 7 along Width and the first electrode 3-1 of being evenly arranged, described several alongst and the second electrode 3-2 that is evenly arranged all be located on the outside surface of the 3rd nesa coating 7 '.
Shown in Fig. 4,5,6,8,9,17, for so that structure of the present utility model is more reasonable, described the first electrically conducting transparent line 3a is that the I shape central axis along the first electrode 3-1 is connected; The second electrically conducting transparent line 3b is that the I shape central axis along the second electrode 3-2 is connected; Described the first electrically conducting transparent line 3a is mutually vertical with the second electrically conducting transparent line 3b, and the mid point a of the first electrically conducting transparent line 3a
0Mid point b with the second electrically conducting transparent line 3b
0Line a
0b
0, both perpendicular to the first electrically conducting transparent line 3a, again perpendicular to the second electrically conducting transparent line 3b.The first electrically conducting transparent line 3a of the present utility model and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Shown in Fig. 8,9, for so that the rationality of the utility model structure, and the homogeneity that guarantees electric field resistance between the adjacent sensing unit, the second width L ' of sensing unit 3-2-1 of the I shape shape of the width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H and the second electrode 3-2 and being in equal proportions of length H '.The width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 of the I shape shape of described the second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Shown in Fig. 4,5,6, in order further to improve the homogeneity of electric field resistance between the adjacent sensing unit, the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 equates with spacing between the second adjacent sensing unit 3-2-1 of the second electrode 3-2.Spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of described the second electrode 3-2 is 4 ~ 10mm.
The second transparent insulation base material 6 among the embodiment 2 is transparent membrane base materials or is clear glass substrate; Described the second nesa coating 7 and the 3rd nesa coating 7 ' are indium tin oxide conductive films, certainly, also can be the graphene conductive films, or the antimony tin conducting film.
Shown in Fig. 1,2,4,5,6,7,8,9,11,12,13,14, a kind of capacitive touch screen, comprise flexible PCB 1 and transparent touch inductive layer 2, described flexible PCB 1 is connected with the end of transparent touch inductive layer 2, (be that flexible PCB 1 is bonding by the end of different side's conducting resinl and transparent touch inductive layer 2,) described transparent touch inductive layer 2 comprises several electrodes that is evenly arranged 3, and several electrodes that are evenly arranged 3 are electrically connected with the corresponding link of flexible PCB 1 by silver slurry line respectively; Described electrode 3 comprises several along Width and the first electrode 3-1 of being evenly arranged and several alongst and the second electrode 3-2 that is evenly arranged, and each first electrode 3-1 is simultaneously mutually vertical with each second electrode 3-2; Described the first electrode 3-1 is followed in series to form by the first electrically conducting transparent line 3a by several first sensing units 3-1-1; Described the second electrode 3-2 is followed in series to form by the second electrically conducting transparent line 3b by several second sensing units 3-2-1; Described the first sensing unit 3-1-1 and the second sensing unit 3-2-1 all are sensing units of I shape shape; The sensing unit of described I shape shape is by the first vertical bar 31 parallel to each other and the 3rd vertical bar 33, and consist of perpendicular to the second vertical bar 32 of the first vertical bar 31 and the 3rd vertical bar 33, and the two ends of the second vertical bar 32 are connected with the central part of the first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
As shown in Figure 1, 2, in order to play a protective role to transparent touch inductive layer 2, prevent that transparent touch inductive layer 2 from damage having occured, described transparent touch inductive layer 2 outside surfaces also are compounded with protective seam 10, and protective seam 10 is bonding with transparent touch inductive layer 2.Protective seam 10 of the present utility model is tempered glass, and tempered glass protective seam 10 is bonding by optical cement and transparent touch inductive layer 2.
Shown in Fig. 4,5,6,11,12,13,14, described transparent touch inductive layer 2 also comprises the 4th transparent insulation base material 8-1 and the 5th transparent insulation base material 8-2, and the 5th nesa coating 9-2 that is provided with of the one side of the 4th nesa coating 9-1 that is provided with of the one side of the 4th transparent insulation base material 8-1 and the 5th transparent insulation base material 8-2; Described several all are located on the outside surface of the 4th nesa coating 8-1 along Width and the first electrode 3-1 of being evenly arranged, described several alongst and the second electrode 3-2 that is evenly arranged all be located on the outside surface of the 5th nesa coating 9-2; Described the 4th transparent insulation base material 8-1, the 4th nesa coating 9-1, the first electrode 3-1 and the 5th transparent insulation base material 8-2, the 5th nesa coating 9-2, the second electrode 3-2 are bonded as one by optical cement.
Shown in Fig. 4,5,6,8,9,17, for so that structure of the present utility model is more reasonable, described the first electrically conducting transparent line 3a is that the I shape central axis along the first electrode 3-1 is connected; The second electrically conducting transparent line 3b is that the I shape central axis along the second electrode 3-2 is connected; Described the first electrically conducting transparent line 3a is mutually vertical with the second electrically conducting transparent line 3b, and the mid point a of the first electrically conducting transparent line 3a
0Mid point b with the second electrically conducting transparent line 3b
0Line a
0b
0, both perpendicular to the first electrically conducting transparent line 3a, again perpendicular to the second electrically conducting transparent line 3b.The first electrically conducting transparent line 3a of the present utility model and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Shown in Fig. 8,9, for so that the rationality of the utility model structure, and the homogeneity that guarantees electric field resistance between the adjacent sensing unit, the second width L ' of sensing unit 3-2-1 of the I shape shape of the width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H and the second electrode 3-2 and being in equal proportions of length H '.The width L of the first sensing unit 3-1-1 of the I shape shape of described the first electrode 3-1 and the ratio of length H are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 of the I shape shape of described the second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Shown in Fig. 4,5,6, in order further to improve the homogeneity of electric field resistance between the adjacent sensing unit, the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 equates with spacing between the second adjacent sensing unit 3-2-1 of the second electrode 3-2.Spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of described the second electrode 3-2 is 4 ~ 10mm.
The 4th transparent insulation base material 8-1 described in the embodiment 3 and the 5th transparent insulation base material 8-2 or be all the transparent membrane base material perhaps are all clear glass substrate; Perhaps the 4th transparent insulation base material 8-1 is the transparent membrane base material, and the 5th transparent insulation base material 8-1 is clear glass substrate.
Shown in Figure 11,12,13,14, the 5th nesa coating 9-2 of the 4th nesa coating 9-1 of described the 4th transparent insulation base material 8-1 and the 5th transparent insulation base material 8-2 in opposite directions, perhaps is reverse perhaps in the same way.
The 4th nesa coating 9-1 and the 5th nesa coating 9-2 among the embodiment 3 are indium tin oxide conductive films, certainly, also can be the graphene conductive films, or the antimony tin conducting film.
The first electrically conducting transparent line 3a described in the utility model is that the I shape central axis (being the central axis of the 3rd vertical bar 33 of the sensing unit of I shape shape) along the first electrode 3-1 is connected; The second electrically conducting transparent line 3b is that the I shape central axis (being the central axis of the 3rd vertical bar 33 of the sensing unit of I shape shape) along the second electrode 3-2 is connected.
Principle of work of the present utility model: during use, when if finger does not touch capacitive touch screen of the present utility model, between the first sensing unit 3-1-1 of the I shape shape that described the first electrode 3-1 is adjacent, between the second sensing unit 3-2-1 of I shape shape that the second electrode 3-2 is adjacent, and the second sensing unit 3-2-1 of the first sensing unit 3-1-1 of the first electrode 3-1 and the second electrode 3-2 also and have stray capacitance between the ground, and this electric capacity is defined as Cx; When if finger touch arrives capacitive touch screen of the present utility model, can produce a coupling capacitance Cf between the first sensing unit 3-1-1 of the first electrode 3-1 and the second sensing unit 3-2-1 of the second electrode 3-2 and the finger, the total capacitance that produce this moment is Ct, be the total capacitance Ct=Cx+Cf that the finger touch capacitance plate produces, flexible PCB 1 touches particular location by processing the difference Cf of the electric capacity that detects this position of finger touch capacitance plate thereby identify.
Each second sensing unit 3-2-1 that alongst goes up of each first sensing unit 3-1-1 on the Width of described the first electrode 3-1 and the second electrode 3-2 produce electric capacity (electrode) size be by finger touch to the contact area size decision of touch-screen, its computing formula Cf=ε * ε.*S/d，
Wherein, S: for the finger with electrode block over against area;
D: be the distance between finger and the electrode block;
ε。: be permittivity of vacuum, ε.=8.854 187 818 * 10-12 farads/rice (F/m);
ε is the specific inductive capacity of material, and the specific inductive capacity of commaterial is a fixed value;
This shows: capacitor C f be directly proportional over against area;
Because the first sensing unit 3-1-1 that the first electrode 3-1 described in the utility model is adjacent connects by the first electrically conducting transparent line 3a; The second sensing unit 3-2-1 that described the second electrode 3-2 is adjacent connects by the second electrically conducting transparent line 3b; Thereby, guaranteed that like this area of the first electrode 3-1 and the second electrode 3-2 two superimposed is minimum, and according to the formula of above-mentioned electric capacity: C=ε * ε.* S/d learns, when the value of inductance capacitance value Cf in constant situation, the value of stray capacitance Cx is less; And according to the computing formula of signal to noise ratio (S/N ratio) d: d=Cf/Cx as can be known, it is larger that signal to noise ratio (S/N ratio) d can become; Therefore, the utility model is compared with traditional capacitive touch sensors, has greatly improved signal to noise ratio (S/N ratio) d, so that touch function of the present utility model is sensitiveer, antijamming capability is stronger.
Such as Fig. 8, shown in 9, the first electrode 3-1 of the present utility model is larger along two parts area of the width L ' of the second sensing unit 3-2-1 of the width L of the first sensing unit 3-1-1 of the I shape shape of Width and the second electrode 3-2 I shape shape alongst, and laterally evenly, greatly increased the contact area between the utility model and the finger, when evenly moving about finger, realized that contact area changes uniform purpose, so that the coordinate diagram of the capacitance variation of the sensing unit of I shape shape of the present utility model approaches para-curve mathematical model as shown in figure 16 more, guarantee that with this capacitive touch screen of the present utility model is more accurate through the position of touch coordinate that the MCU controller 1-1 of flexible PCB 1 is calculated, the linearity is also better; And reduced the resistance of whole sensing unit (electrode) passage, the principle that detects according to the MCU controller 1-1 of flexible board 1, the frequency that sensing unit (electrode) is discharged and recharged is: f=1/ (R*C), wherein, R is the resistance value of sensing unit (electrode) passage, and C is the capacitance that sensing unit (electrode) produces; In the constant situation of sensing unit (electrode) capacitance C, resistance R is less, the MCU controller 1-1 of flexible PCB 1 is faster to the frequency f that sensing unit (electrode) discharges and recharges, and therefore, the reaction velocity of the capacitive touch screen of the I shape sensing unit that the utility model is designed is just faster.Traditional capacitive touch screen is all very harsh in ohmically requirement, and a lot of producers require the resistance of sensing unit (electrode) passage below 10K; If the surface resistance of the tin indium oxide of selecting (ITO) material is in the situation in 200 Europe, much sensing unit (electrode) electrode of other figure (cruciform, triangle, bar shaped etc.) is not all realized this requirement, in order to realize the low requirement of single sensing unit (electrode) aisle resistance, only has low tin indium oxide (ITO) conductive material of the surface resistance of employing, and low tin indium oxide (ITO) conductive material of general surface resistance not only price is very high, and because low tin indium oxide (ITO) the conductive material wound easy to break of resistance has also increased technology difficulty greatly; And the designed I shape sensing unit (electrode) of the utility model also can satisfy the requirement of whole passage resistance below 10K can be implemented in the above conductive material in surface resistance 200 Europe the time, therefore, greatly reduces its production cost.
The utility model has not only improved the reaction velocity of touch-control, and has reduced production cost.Compared with prior art can adopt the higher tin indium oxide of resistance (ITO) conductive material, that is because of high tin indium oxide (ITO) the conductive material wound not easy to break of resistance, so the utility model has also reduced the difficulty of explained hereafter.
Capacitive touch screen of the present utility model does not limit on the various electronic equipments such as being applied to digital camera, navigating instrument, mobile phone, palm PC, is applicable on the control panel of required use capacitive touch screen in other different technical field yet.
Claims (13)
1. capacitive touch screen, comprise flexible PCB (1) and transparent touch inductive layer (2), described flexible PCB (1) is connected with the end of transparent touch inductive layer (2), described transparent touch inductive layer (2) comprises several electrodes that is evenly arranged (3), and several electrodes that are evenly arranged (3) are electrically connected with the corresponding link of flexible PCB (1) respectively; It is characterized in that:
A, described electrode (3) comprise several along Width and the first electrode (3-1) that is evenly arranged and several alongst and the second electrode (3-2) that is evenly arranged, and each first electrode (3-1) is mutually vertical with each second electrode (3-2) simultaneously;
B, described the first electrode (3-1) are followed in series to form by the first electrically conducting transparent line (3a) by several first sensing units (3-1-1);
C, described the second electrode (3-2) are followed in series to form by the second electrically conducting transparent line (3b) by several second sensing units (3-2-1);
D, described the first sensing unit (3-1-1) and the second sensing unit (3-2-1) all are sensing units of I shape shape;
The sensing unit of e, described I shape shape is by the first vertical bar (31) parallel to each other and the 3rd vertical bar (33), and consist of perpendicular to second vertical bar (32) of the first vertical bar (31) and the 3rd vertical bar (33), and the two ends of the second vertical bar (32) are connected with the central part of the first vertical bar (31) and the central part of the 3rd vertical bar (33) respectively.
2. capacitive touch screen according to claim 1, it is characterized in that: described transparent touch inductive layer (2) outside surface also is compounded with protective seam (10), and protective seam (10) is bonding with transparent touch inductive layer (2).
3. capacitive touch screen according to claim 1, it is characterized in that: described transparent touch inductive layer (2) also comprises the first transparent insulation base material (5), and the first nesa coating (4) of being provided with of the one side of the first transparent insulation base material (5); Described several along Width and the first electrode (3-1) that is evenly arranged and several alongst and the second electrode (3-2) that is evenly arranged all be located on the outside surface of the first nesa coating (4).
4. capacitive touch screen according to claim 1, it is characterized in that: described transparent touch inductive layer (2) also comprises the second transparent insulation base material (6), and the two sides of the second transparent insulation base material (6) the second nesa coating (7) and the 3rd nesa coating (7 ') that are respectively equipped with; Described several all are located on the outside surface of the second nesa coating (7) along Width and the first electrode (3-1) of being evenly arranged, described several alongst and the second electrode (3-2) that is evenly arranged all be located on the outside surface of the 3rd nesa coating (7 ').
5. capacitive touch screen according to claim 1, it is characterized in that: described transparent touch inductive layer (2) also comprises the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2), and the 5th nesa coating (9-2) that is provided with of the one side of the 4th nesa coating (9-1) that is provided with of the one side of the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2); Described several all are located on the outside surface of the 4th nesa coating (8-1) along Width and the first electrode (3-1) of being evenly arranged, described several alongst and the second electrode (3-2) that is evenly arranged all be located on the outside surface of the 5th nesa coating (9-2); Described the 4th transparent insulation base material (8-1), the 4th nesa coating (9-1), the first electrode (3-1) and the 5th transparent insulation base material (8-2), the 5th nesa coating (9-2), the second electrode (3-2) are bonded as one.
6. it is characterized in that according to claim 1 or 3 or 4 or 5 described capacitive touch screens: described the first electrically conducting transparent line (3a) is that the I shape central axis along the first electrode (3-1) is connected; The second electrically conducting transparent line (3b) is that the I shape central axis along the second electrode (3-2) is connected; Described the first electrically conducting transparent line (3a) is mutually vertical with the second electrically conducting transparent line (3b), and the mid point a of the first electrically conducting transparent line (3a)
0Mid point b with the second electrically conducting transparent line (3b)
0Line a
0b
0, both perpendicular to the first electrically conducting transparent line (3a), again perpendicular to the second electrically conducting transparent line (3b).
7. it is characterized in that according to claim 1 or 3 or 4 or 5 described capacitive touch screens: the width L ' of the second sensing unit (3-2-1) of the I shape shape of the width L of first sensing unit (3-1-1) of the I shape shape of described the first electrode (3-1) and the ratio of length H and the second electrode (3-2) and being in equal proportions of length H '.
8. it is characterized in that according to claim 1 or 3 or 4 or 5 described capacitive touch screens: the spacing between adjacent first sensing unit (3-1-1) of described the first electrode (3-1) equates with spacing between adjacent second sensing unit (3-2-1) of the second electrode (3-2).
9. capacitive touch screen according to claim 7, it is characterized in that: the width L of first sensing unit (3-1-1) of the I shape shape of described the first electrode (3-1) and the ratio of length H are 0.5 ~ 2; The width L ' of second sensing unit (3-2-1) of the I shape shape of described the second electrode (3-2) is 0.5 ~ 2 with the ratio of length H '.
10. capacitive touch screen according to claim 8, it is characterized in that: the spacing between adjacent first sensing unit (3-1-1) of described the first electrode (3-1) is 4 ~ 10mm; Spacing between adjacent second sensing unit (3-2-1) of described the second electrode (3-2) is 4 ~ 10mm.
11. the structure of capacitive touch screen sensor according to claim 5 is characterized in that: described the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2) or be all the transparent membrane base material perhaps are all clear glass substrate; Perhaps the 4th transparent insulation base material (8-1) is the transparent membrane base material, and the 5th transparent insulation base material (8-1) is clear glass substrate.
12. the structure of capacitive touch screen sensor according to claim 5, it is characterized in that: the 5th nesa coating (9-2) of the 4th nesa coating (9-1) of described the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2) is in the same way, for in opposite directions, perhaps be reverse perhaps.
13. the structure of capacitive touch screen sensor according to claim 1; it is characterized in that: described flexible PCB (1) comprises MCU controller (1-1); filtering circuit (1-2); power protecting circuit (1-3) and connector (1-4); several first electrodes (3-1) and several the second electrodes (3-2) are electrically connected with the corresponding link of MCU controller (1-1) respectively; MCU controller (1-1) is electrically connected with filtering circuit (1-2) and the corresponding link of connector (1-4) respectively, and described MCU controller (1-1) also is electrically connected with the corresponding link of power protecting circuit (1-3) respectively with connector (1-4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220467887 CN202815802U (en) | 2012-09-14 | 2012-09-14 | Capacitive touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220467887 CN202815802U (en) | 2012-09-14 | 2012-09-14 | Capacitive touch screen |
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| Publication Number | Publication Date |
|---|---|
| CN202815802U true CN202815802U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220467887 Expired - Fee Related CN202815802U (en) | 2012-09-14 | 2012-09-14 | Capacitive touch screen |
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| CN (1) | CN202815802U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819375A (en) * | 2012-09-14 | 2012-12-12 | 常州裕成光电有限公司 | Capacitive touch screen |
| CN105929993A (en) * | 2016-04-06 | 2016-09-07 | 昆山工研院新型平板显示技术中心有限公司 | Flexible touch panel detection wire structure and flexible touch panel |
-
2012
- 2012-09-14 CN CN 201220467887 patent/CN202815802U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819375A (en) * | 2012-09-14 | 2012-12-12 | 常州裕成光电有限公司 | Capacitive touch screen |
| CN102819375B (en) * | 2012-09-14 | 2016-05-04 | 常州裕成光电有限公司 | Capacitive touch screen |
| CN105929993A (en) * | 2016-04-06 | 2016-09-07 | 昆山工研院新型平板显示技术中心有限公司 | Flexible touch panel detection wire structure and flexible touch panel |
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