CN102819375B - Capacitive touch screen - Google Patents
Capacitive touch screen Download PDFInfo
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- CN102819375B CN102819375B CN201210340476.0A CN201210340476A CN102819375B CN 102819375 B CN102819375 B CN 102819375B CN 201210340476 A CN201210340476 A CN 201210340476A CN 102819375 B CN102819375 B CN 102819375B
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Abstract
The present invention discloses 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, transparent touch inductive layer comprises the electrode that several are evenly arranged, and several electrodes are electrically connected with the corresponding link of flexible PCB respectively; Electrode comprises several first and second electrodes, and each first electrode is simultaneously mutually vertical with each second electrode; First and second electrode is followed in series to form by corresponding first, second electrically conducting transparent line by several first, second sensing units respectively; First, second sensing unit is all sensing units of I shape shape; The sensing unit of I shape shape is by the first vertical bar parallel to each other and the 3rd vertical bar, and forms 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 3rd vertical bar with the first vertical bar respectively. The present invention has the advantages such as the good and touch-control sensitivity height of antijamming capability.
Description
Technical field
The present invention relates to a kind of touch-screen, be specifically related to a kind of capacitive touch screen, belong to 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 producing while utilizing human body contact conductive film checks touch location, realized multi-point touch and convenient operation amplification, dwindle, spinfunction, favored by people. The sensing unit that the electrode that existing capacitive touch screen comprises has mostly is rhombus, certainly also there are cross, triangle, rectangle or hexagonal sensing unit, the sensing unit of above-mentioned shape there will be uniformity and the bad situation of uniformity in use, has the shortcomings such as poor anti jamming capability, touch-control sensitivity be low.
Summary of the invention
The object of the invention 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, technical scheme of the present invention 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 being evenly arranged and several alongst and the second electrode being 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 are all 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 form 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 3rd vertical bar with the central part of the first vertical bar respectively.
In technique scheme, described transparent touch inductive layer outer surface is also compounded with protective layer, and protective layer and transparent touch inductive layer 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 being evenly arranged be all located on the outer 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 are all located on the outer surface of the second nesa coating along width and the first electrode of being evenly arranged, described several alongst and the second electrode being evenly arranged be all located on the outer 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 are all located on the outer surface of the 4th nesa coating along width and the first electrode of being evenly arranged, described several alongst and the second electrode being evenly arranged be all located on the outer 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 to be connected along the I shape central axis of the first electrode; The second electrically conducting transparent line is to be connected along the I shape central axis of the second electrode; 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 line0Mid point b with the second electrically conducting transparent line0Line a0b0, 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 spacing between the first adjacent sensing unit of described the first electrode and the second adjacent sensing unit of the second electrode equates.
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 transparent membrane base material, or be all clear glass substrate; Or the 4th transparent insulation base material is transparent membrane base material, and the 5th transparent insulation base material is clear glass substrate.
In technique scheme, the 4th nesa coating of described the 4th transparent insulation base material and the 5th nesa coating of the 5th transparent insulation base material be in the same way, or in opposite directions, or be reverse.
In technique scheme; described flexible PCB comprises MCU controller, filter circuit, power protecting circuit and connector; several first electrodes and several second electrodes are electrically connected with the corresponding link of MCU controller respectively; MCU controller is electrically connected with filter circuit and the corresponding link of connector respectively, and described MCU controller is also electrically connected with the corresponding link of power protecting circuit respectively with connector.
The good effect that the present invention has is: because sensing unit of the present invention 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, makes the overlapping area of the first electrode and the second electrode minimum; In the time of touch-control capacitive touch screen of the present invention, transparent touch inductive layer can form electrostatic field, in the time of 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 being alongst evenly arranged accordingly, the mutually variation of the coupling capacitance of square crossing place, identifies user's position of touch with this; If when finger touch, coupling capacitance also can reduce, if when finger evenly moves left and right, finger can be realized and reduces uniformly or increase with the contact area of the sensing unit of I shape shape, reach the object of contact area even variation, made the accuracy of position of touch identification high; Thereby electric field resistance of the present invention is more even, have advantages of that antijamming capability is strong and touch-control is highly sensitive.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of capacitive touch screen embodiment of the present invention;
Fig. 2 is the A-A direction cross-sectional schematic in 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 invention and the arrange schematic diagram of the second electrode on nesa coating;
Fig. 5 is the structural representation of the first electrode in Fig. 1;
Fig. 6 is the structural representation of the second electrode in Fig. 1;
Fig. 7 is the structural representation of the sensing unit of I shape shape of the present invention;
Fig. 8 is the I portion enlarged diagram in Fig. 4;
Fig. 9 is the B portion enlarged diagram in Fig. 4;
Figure 10 is the second structural representation of transparent touch inductive layer of the present invention;
Figure 11 is the third structural representation of transparent touch inductive layer of the present invention;
Figure 12 is the 4th kind of structural representation of transparent touch inductive layer of the present invention;
Figure 13 is the 5th kind of structural representation of transparent touch inductive layer of the present invention;
Figure 14 is the 6th kind of structural representation of transparent touch inductive layer of the present invention;
Figure 15 is the circuit theory block diagram of a kind of flexible PCB of the present invention;
Mathematics parabola model figure when Figure 16 is capacitive touch screen touch-control of the present invention;
Figure 17 is that schematic diagram is arranged in the space of the first electrically conducting transparent line of the present invention and the second electrically conducting transparent DNA mitochondrial DNA.
Detailed description of the invention
Below in conjunction with accompanying drawing and the embodiment that provides, the present invention is further illustrated.
Embodiment 1
As 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 the electrode 3 that several are evenly arranged, and several electrodes 3 that are evenly arranged are starched line by silver respectively and are electrically connected with the corresponding link of flexible PCB 1; 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 being 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 are all 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 form 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 3rd vertical bar 33 with the central part of the first vertical bar 31 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 occurred, described transparent touch inductive layer 2 outer surfaces are also compounded with protective layer 10, and protective layer 10 is bonding with transparent touch inductive layer 2. Protective layer 10 of the present invention is safety glass, and safety glass protective layer 10 is bonding by optical cement and transparent touch inductive layer 2.
As 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 being evenly arranged be all located on the outer surface of the first nesa coating 4.
As shown in Fig. 4,5,6,8,9,17, in order to make structure of the present invention more reasonable, described the first electrically conducting transparent line 3a is connected along the I shape central axis of the first electrode 3-1; The second electrically conducting transparent line 3b is connected along the I shape central axis of the second electrode 3-2; 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 3a0Mid point b with the second electrically conducting transparent line 3b0Line a0b0, 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 invention and the second electrically conducting transparent line 3b not at grade, and do not connect between the two.
As shown in Figure 8,9, in order to make the reasonability of structure of the present invention, and ensure the uniformity of electric field resistance between 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 and the ratio of length H of the I shape shape of described the first electrode 3-1 are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 and the ratio of length H ' of the I shape shape of described the second electrode 3-2 are 0.5 ~ 2.
As shown in Figure 4,5, 6, in order further to improve the uniformity of electric field resistance between adjacent sensing unit, the spacing between the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 and the second adjacent sensing unit 3-2-1 of the second electrode 3-2 equates. 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 in 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, can be also graphene conductive film, or antimony tin conducting film.
Embodiment 2
As 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 the electrode 3 that several are evenly arranged, and several electrodes 3 that are evenly arranged are starched line by silver respectively and are electrically connected with the corresponding link of flexible PCB 1; 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 being 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 are all 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 form 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 3rd vertical bar 33 with the central part of the first vertical bar 31 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 occurred, described transparent touch inductive layer 2 outer surfaces are also compounded with protective layer 10, and protective layer 10 is bonding with transparent touch inductive layer 2. Protective layer 10 of the present invention is safety glass, and safety glass protective layer 10 is bonding by optical cement and transparent touch inductive layer 2.
As 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 are all located on the outer 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 being evenly arranged be all located on the outer surface of the 3rd nesa coating 7 '.
As shown in Fig. 4,5,6,8,9,17, in order to make structure of the present invention more reasonable, described the first electrically conducting transparent line 3a is connected along the I shape central axis of the first electrode 3-1; The second electrically conducting transparent line 3b is connected along the I shape central axis of the second electrode 3-2; 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 3a0Mid point b with the second electrically conducting transparent line 3b0Line a0b0, 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 invention and the second electrically conducting transparent line 3b not at grade, and do not connect between the two.
As shown in Figure 8,9, in order to make the reasonability of structure of the present invention, and ensure the uniformity of electric field resistance between 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 and the ratio of length H of the I shape shape of described the first electrode 3-1 are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 and the ratio of length H ' of the I shape shape of described the second electrode 3-2 are 0.5 ~ 2.
As shown in Figure 4,5, 6, in order further to improve the uniformity of electric field resistance between adjacent sensing unit, the spacing between the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 and the second adjacent sensing unit 3-2-1 of the second electrode 3-2 equates. 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 in 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, can be also graphene conductive films, or antimony tin conducting film.
Embodiment 3
As 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 the electrode 3 that several are evenly arranged, and several electrodes 3 that are evenly arranged are starched line by silver respectively and are electrically connected with the corresponding link of flexible PCB 1; 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 being 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 are all 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 form 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 3rd vertical bar 33 with the central part of the first vertical bar 31 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 occurred, described transparent touch inductive layer 2 outer surfaces are also compounded with protective layer 10, and protective layer 10 is bonding with transparent touch inductive layer 2. Protective layer 10 of the present invention is safety glass, and safety glass protective layer 10 is bonding by optical cement and transparent touch inductive layer 2.
As 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 are all located on the outer 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 being evenly arranged be all located on the outer 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.
As shown in Fig. 4,5,6,8,9,17, in order to make structure of the present invention more reasonable, described the first electrically conducting transparent line 3a is connected along the I shape central axis of the first electrode 3-1; The second electrically conducting transparent line 3b is connected along the I shape central axis of the second electrode 3-2; 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 3a0Mid point b with the second electrically conducting transparent line 3b0Line a0b0, 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 invention and the second electrically conducting transparent line 3b not at grade, and do not connect between the two.
As shown in Figure 8,9, in order to make the reasonability of structure of the present invention, and ensure the uniformity of electric field resistance between 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 and the ratio of length H of the I shape shape of described the first electrode 3-1 are 0.5 ~ 2; The width L ' of the second sensing unit 3-2-1 and the ratio of length H ' of the I shape shape of described the second electrode 3-2 are 0.5 ~ 2.
As shown in Figure 4,5, 6, in order further to improve the uniformity of electric field resistance between adjacent sensing unit, the spacing between the spacing between the first adjacent sensing unit 3-1-1 of described the first electrode 3-1 and the second adjacent sensing unit 3-2-1 of the second electrode 3-2 equates. 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 embodiment 3 and the 5th transparent insulation base material 8-2 or be all transparent membrane base material, or be all clear glass substrate; Or the 4th transparent insulation base material 8-1 is transparent membrane base material, and the 5th transparent insulation base material 8-1 is clear glass substrate.
As 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 is in the same way, or in opposite directions, or be reverse.
The 4th nesa coating 9-1 and the 5th nesa coating 9-2 in embodiment 3 are indium tin oxide conductive films, certainly, can be also graphene conductive films, or antimony tin conducting film.
Described in above-described embodiment 1,2,3, flexible PCB 1 comprises MCU controller 1-1, filter circuit 1-2, power protecting circuit 1-3 and connector 1-4; several first electrodes 3-1 and several 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 filter circuit 1-2 and the corresponding link of connector 1-4 respectively, and described MCU controller 1-1 is also electrically connected with the corresponding link of power protecting circuit 1-3 respectively with connector 1-4.
The first electrically conducting transparent line 3a of the present invention 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.
Operation principle of the present invention: when use, if when finger does not touch capacitive touch screen of the present invention, 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 first the first sensing unit 3-1-1 of electrode 3-1 and the second sensing unit 3-2-1 of the second electrode 3-2 also and between ground, have parasitic capacitance, this electric capacity is defined as Cx; If when finger touch arrives capacitive touch screen of the present invention, 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 finger, can produce a coupling capacitance Cf, the total capacitance that now produced is Ct, be the total capacitance Ct=Cx+Cf that finger touch capacitance plate produces, flexible PCB 1 detects the difference Cf of the electric capacity of this position of finger touch capacitance plate by processing, thereby identification touches particular location.
Each second sensing unit 3-2-1 alongst going up along each the first sensing unit 3-1-1 on width and the second electrode 3-2 of described the first electrode 3-1 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 finger and the right opposite of electrode block amass;
D: be the distance between finger and electrode block;
ε. : be permittivity of vacuum, ε.=8.854187818 × 10-12 farad/rice (F/m);
ε is the dielectric constant of material, and the dielectric constant of commaterial is a fixed value;
This shows: capacitor C f is directly proportional to right opposite is long-pending;
The first sensing unit 3-1-1 adjacent due to the first electrode 3-1 of the present invention 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, ensure 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 induced electricity capacitance Cf is constant in the situation that, the value of parasitic capacitance Cx is less; And known according to the computing formula of signal to noise ratio d: d=Cf/Cx, it is larger that signal to noise ratio d can become; Therefore, the present invention, compared with traditional capacitive touch sensors, has improved signal to noise ratio d greatly, makes touch function of the present invention sensitiveer, and antijamming capability is stronger.
As Fig. 8, shown in 9, the first electrode 3-1 of the present invention is larger along two parts area of the width L ' of the width L of the first sensing unit 3-1-1 of the I shape shape of width and the second sensing unit 3-2-1 of the second electrode 3-2 I shape shape alongst, and laterally even, greatly increase the contact area between the present invention and finger, in the time that finger left and right is evenly mobile, realize contact area and changed uniform object, make the coordinate diagram of the capacitance variation of the sensing unit of I shape shape of the present invention more approach parabola Mathematical Modeling as shown in figure 16, the position of touch coordinate of guaranteeing that with this capacitive touch screen of the present invention calculated through the MCU controller 1-1 of flexible PCB 1 is more accurate, the linearity is also better, and reduce the resistance of whole sensing unit (electrode) passage, the principle detecting 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 situation that sensing unit (electrode) capacitance C is constant, resistance R is less, the frequency f that the MCU controller 1-1 of flexible PCB 1 discharges and recharges sensing unit (electrode) is faster, and therefore, the reaction speed of the capacitive touch screen of the designed I shape sensing unit of the present invention 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 (cross, 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 due to the easy injured of the low tin indium oxide of resistance (ITO) conductive material, also greatly increase technology difficulty, and the designed I shape sensing unit (electrode) of the present invention can realize also can meet the requirement of whole passage resistance below 10K in the time of the conductive material with more than surface resistance 200 Europe, therefore, greatly reduce its production cost.
The present invention has not only improved the reaction speed of touch-control, and has reduced production cost. Compared with prior art can adopt the tin indium oxide that resistance is higher (ITO) conductive material, that is because high tin indium oxide (ITO) conductive material of resistance is difficult for injured, so the present invention has also reduced the difficulty of explained hereafter.
Capacitive touch screen of the present invention does not limit on various electronic equipments such as being applied to digital camera, navigator, mobile phone, palm PC, is applicable on the control panel of required use capacitive touch screen in other different technical field yet.
Claims (10)
1. a 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 being 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) being evenly arranged and several alongst and the second electrode (3-2) being evenly arranged, and each first electrode (3-1) is simultaneously mutually vertical with each second electrode (3-2);
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) are all 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 form 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 3rd vertical bar (33) with the central part of the first vertical bar (31) respectively;
F, described the first electrically conducting transparent line (3a) are to be connected along the I shape central axis of the first electrode (3-1); The second electrically conducting transparent line (3b) is to be connected along the I shape central axis of the second electrode (3-2); 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 a0b0, both perpendicular to the first electrically conducting transparent line (3a), again perpendicular to the second electrically conducting transparent line (3b);
The width L ' of the second 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 g, 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 ';
Spacing between spacing between adjacent first sensing unit (3-1-1) of h, described the first electrode (3-1) and adjacent second sensing unit (3-2-1) of the second electrode (3-2) equates.
2. capacitive touch screen according to claim 1, is characterized in that: described transparent touch inductive layer (2) outer surface is also compounded with protective layer (10), and protective layer (10) is bonding with transparent touch inductive layer (2).
3. capacitive touch screen according to claim 1, 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) being evenly arranged and several alongst and the second electrode (3-2) being evenly arranged be all located on the outer 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 are all located on the outer 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) being evenly arranged be all located on the outer 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 are all located on the outer 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) being evenly arranged be all located on the outer 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. capacitive touch screen according to claim 1, is characterized in that: the width L of the first sensing unit (3-1-1) and the ratio of length H of the I shape shape of described the first electrode (3-1) are 0.5 ~ 2; The width L ' of the second sensing unit (3-2-1) and the ratio of length H ' of the I shape shape of described the second electrode (3-2) are 0.5 ~ 2.
7. capacitive touch screen according to claim 1, 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.
8. capacitive touch screen 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 transparent membrane base material, or be all clear glass substrate; Or the 4th transparent insulation base material (8-1) is transparent membrane base material, and the 5th transparent insulation base material (8-1) is clear glass substrate.
9. capacitive touch screen according to claim 5, it is characterized in that: the 4th nesa coating (9-1) of described the 4th transparent insulation base material (8-1) and the 5th nesa coating (9-2) of the 5th transparent insulation base material (8-2) are in the same way, or in opposite directions, or be reverse.
10. capacitive touch screen according to claim 1, it is characterized in that: described flexible PCB (1) comprises MCU controller (1-1), filter 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 filter circuit (1-2) and the corresponding link of connector (1-4) respectively, described MCU controller (1-1) is also electrically connected with the corresponding link of power protecting circuit (1-3) respectively with connector (1-4).
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| CN201210340476.0A CN102819375B (en) | 2012-09-14 | 2012-09-14 | Capacitive touch screen |
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| CN103105988B (en) * | 2013-01-22 | 2016-01-06 | 北京京东方光电科技有限公司 | Capacitive touch screen, the manufacture method of touch control display apparatus and capacitive touch screen |
| CN103164101A (en) * | 2013-04-03 | 2013-06-19 | 格林精密部件（惠州）有限公司 | Capacitance touch screen based on grapheme sensors |
| CN103367865B (en) * | 2013-07-15 | 2017-04-12 | 华为终端有限公司 | Manufacturing method of antenna and terminal device |
| CN104460851A (en) * | 2013-09-24 | 2015-03-25 | 深圳桑菲消费通信有限公司 | Double-face touch electronic equipment and touch method |
| CN104090693A (en) * | 2014-05-09 | 2014-10-08 | 浙江金指科技有限公司 | Capacitance touch screen |
| CN109213354A (en) * | 2017-07-04 | 2019-01-15 | 佛山市顺德区美的电热电器制造有限公司 | Touch controlled key component, Feedback Vibration Control method and household device |
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| CN101625614A (en) * | 2008-07-11 | 2010-01-13 | 三星移动显示器株式会社 | Touch screen panel and fabricating method for the same |
| CN201876858U (en) * | 2010-12-15 | 2011-06-22 | 深圳宝明精工有限公司 | Double-sided staggered capacitive touch screen |
| CN202815802U (en) * | 2012-09-14 | 2013-03-20 | 常州裕成光电有限公司 | Capacitive touch screen |
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| US20110227868A1 (en) * | 2010-03-17 | 2011-09-22 | Edamak Corporation | Proximity-sensing panel |
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| CN101625614A (en) * | 2008-07-11 | 2010-01-13 | 三星移动显示器株式会社 | Touch screen panel and fabricating method for the same |
| CN201876858U (en) * | 2010-12-15 | 2011-06-22 | 深圳宝明精工有限公司 | Double-sided staggered capacitive touch screen |
| CN202815802U (en) * | 2012-09-14 | 2013-03-20 | 常州裕成光电有限公司 | Capacitive touch screen |
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