CN102819375A - Capacitive touch screen - Google Patents
Capacitive touch screen Download PDFInfo
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- CN102819375A CN102819375A CN2012103404760A CN201210340476A CN102819375A CN 102819375 A CN102819375 A CN 102819375A CN 2012103404760 A CN2012103404760 A CN 2012103404760A CN 201210340476 A CN201210340476 A CN 201210340476A CN 102819375 A CN102819375 A CN 102819375A
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Abstract
The invention discloses a capacitive touch screen. The capacitive touch screen comprises a flexible circuit board and a transparent touch-control sensitive layer, wherein the flexible circuit board is connected with the end part of the transparent touch-control sensitive layer, the transparent touch-control sensitive layer comprises multiple uniformly arranged electrodes, and multiple electrodes are respectively in electrical connection with the corresponding connection end of the flexible circuit board; the electrodes include multiple first and second electrodes, and each first electrode is simultaneously perpendicular to each second electrode; the first and second electrodes are respectively composed of multiple first and second sensing units orderly connected in series by corresponding first and second transparent leads; all the first and second sensing units are I-shaped sensing units; the I-shaped sensing units are respectively composed of a first straight bar and a third straight bar, and a second straight bar perpendicular to the first straight bar and the third straight bar, wherein two ends of the second straight bar are respectively connected with the central parts of the first straight bar and the third straight bar. The capacitive touch screen has the advantages of excellent interference resistance, high touch-control sensitivity, and so on.
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 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 said touch-screen comprises infrared-type touch-screen, surface acoustic wave type 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 is checked touch location, has realized multi-point touch and the amplification of being convenient to operate, dwindles, spinfunction, therefore favored by people.Mostly the sensing unit that electrode had that existing capacitive touch screen comprises 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 shortcomings such as poor anti jamming capability, touch-control sensitivity be low.
Summary of the invention
The objective 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; Said flexible PCB is connected with the end of transparent touch inductive layer, and said transparent touch inductive layer comprises the electrode that several are evenly arranged, and several electrodes of evenly arranging are electrically connected with the corresponding link of flexible PCB respectively; Its improvement is:
A, said electrode comprise several along Width and first electrode of evenly arranging and several alongst and second electrode of evenly arranging, each first electrode is simultaneously vertical each other with each second electrode;
B, said first electrode are followed in series to form through the first electrically conducting transparent line by several first sensing units;
C, said second electrode are followed in series to form through the second electrically conducting transparent line by several second sensing units;
D, said first sensing unit and second sensing unit all are sensing units of I shape shape;
The sensing unit of e, said I shape shape is by first vertical bar parallel to each other and the 3rd vertical bar; And constitute perpendicular to second vertical bar of first vertical bar and the 3rd vertical bar, and the two ends of second vertical bar are connected with the central part of first vertical bar and the central part of the 3rd vertical bar respectively.
In technique scheme, said 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, said transparent touch inductive layer also comprises the first transparent insulation base material, and first nesa coating that is provided with of the one side of the first transparent insulation base material; Said several along Width and first electrode evenly arranged with several alongst and second electrode of evenly arranging all be located on the outside surface of first nesa coating.
In technique scheme, said transparent touch inductive layer also comprises the second transparent insulation base material, and the two sides of the second transparent insulation base material second nesa coating and the 3rd nesa coating that are respectively equipped with; Said several all are located on the outside surface of second nesa coating along Width and first electrodes of evenly arranging, said several alongst and second electrode of evenly arranging all be located on the outside surface of the 3rd nesa coating.
In technique scheme; Said 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; Said several all are located on the outside surface of the 4th nesa coating along Width and first electrodes of evenly arranging, said several alongst and second electrode of evenly arranging all be located on the outside surface of the 5th nesa coating; Said the 4th transparent insulation base material, the 4th nesa coating, first electrode and the 5th transparent insulation base material, the 5th nesa coating, second electrode are bonded as one.
In technique scheme, the said first electrically conducting transparent line is that the I shape central axis along first electrode is connected; The second electrically conducting transparent line is that the I shape central axis along second electrode is connected; The said first electrically conducting transparent line is vertical each other 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 second sensing unit of the I shape shape of the width L of first sensing unit of the I shape shape of said first electrode and the ratio of length H and second electrode and being in equal proportions of length H '.
In technique scheme, the spacing between the first adjacent sensing unit of said first electrode equates with spacing between the second adjacent sensing unit of second electrode.
In technique scheme, the width L of first sensing unit of the I shape shape of said first electrode and the ratio of length H are 0.5 ~ 2; The width L ' of second sensing unit of the I shape shape of said second electrode is 0.5 ~ 2 with the ratio of length H '.
In technique scheme, the spacing between the first adjacent sensing unit of said first electrode is 4 ~ 10mm; Spacing between the second adjacent sensing unit of said second electrode is 4 ~ 10mm.
In technique scheme, said the 4th transparent insulation base material and the 5th transparent insulation base material perhaps are 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 a clear glass substrate.
In technique scheme, the 5th nesa coating of the 4th nesa coating of said 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; Said flexible PCB comprises MCU controller, filtering circuit, power protecting circuit and connector; Several first electrodes are electrically connected with the corresponding link of MCU controller respectively with several second electrodes; The MCU controller is electrically connected with filtering circuit and the corresponding link of connector respectively, and said MCU controller also is electrically connected with the corresponding link of power protecting circuit respectively with connector.
The good effect that the present invention had 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 bigger; And each first electrode is simultaneously vertical each other with each second electrode, makes the overlapping area of the win electrode and second electrode minimum; When touch-control capacitive touch screen of the present invention; The transparent touch inductive layer can form electrostatic field; Promptly when user's multi-point touch; First sensing unit through detecting several first electrodes of evenly arranging along Width respectively with second sensing unit of corresponding second electrode of alongst evenly arranging, the variation of the coupling capacitance of square crossing place is discerned user's position of touch with this each other; If during finger touch; Then coupling capacitance also can reduce, if the even move left and right of finger the time, 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, made that the accuracy of position of touch identification is high; Thereby electric field resistance of the present invention 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 invention;
Fig. 2 is the A-A direction cross-sectional schematic among Fig. 1;
Fig. 3 is first kind of structural representation of the transparent touch inductive layer of Fig. 1;
Fig. 4 is first electrode of the present invention and the arrange synoptic diagram of second electrode on nesa coating;
Fig. 5 is the structural representation of first electrode among Fig. 1;
Fig. 6 is the structural representation of second electrode among 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 among Fig. 4;
Fig. 9 is the B portion enlarged diagram among Fig. 4;
Figure 10 is second kind of 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 a capacitive touch screen touch-control of the present invention;
Figure 17 is the spatial placement synoptic diagram of the first electrically conducting transparent line of the present invention and the second electrically conducting transparent DNA mitochondrial DNA.
Embodiment
Below in conjunction with accompanying drawing and the embodiment that provides the present invention is further described.
Like Fig. 1,2,3,4,5,6,7,8, shown in 9; A kind of capacitive touch screen; Comprise flexible PCB 1 and transparent touch inductive layer 2; Said flexible PCB 1 is connected with the end of transparent touch inductive layer 2; (being that flexible PCB 1 is bonding through the end of different side's conducting resinl and transparent touch inductive layer 2) said transparent touch inductive layer 2 comprises the electrode 3 that several are evenly arranged, and several electrodes 3 of evenly arranging are electrically connected with the corresponding link of flexible PCB 1 through silver slurry line respectively; Said electrode 3 comprise several along Width and the first electrode 3-1 that evenly arranges with several alongst and the second electrode 3-2 that evenly arranges, each first electrode 3-1 is simultaneously vertical each other with each second electrode 3-2; The said first electrode 3-1 is followed in series to form through the first electrically conducting transparent line 3a by several first sensing units 3-1-1; The said second electrode 3-2 is followed in series to form through the second electrically conducting transparent line 3b by several second sensing units 3-2-1; The said 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 said I shape shape is by first vertical bar 31 parallel to each other and the 3rd vertical bar 33; And constitute perpendicular to second vertical bar 32 of first vertical bar 31 and the 3rd vertical bar 33, and the two ends of second vertical bar 32 are connected with the central part of first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
Like Fig. 1, shown in 2, in order to play a protective role, prevent that transparent touch inductive layer 2 from damage having taken place to transparent touch inductive layer 2, said 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 invention is a tempered glass, and tempered glass protective seam 10 is bonding through optical cement and transparent touch inductive layer 2.
Like Fig. 3,4,5, shown in 6, said transparent touch inductive layer 2 also comprises the first transparent insulation base material 5, and first nesa coating 4 that is provided with of the one side of the first transparent insulation base material 5; Said several along Width and the first electrode 3-1 that evenly arranges with several alongst and the second electrode 3-2 that evenly arranges all be located on the outside surface of first nesa coating 4.
Like Fig. 4,5,6,8,9, shown in 17, in order to make structure of the present invention more reasonable, the said 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; The said first electrically conducting transparent line 3a is vertical each other 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 invention and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Like Fig. 8, shown in 9; In order to make the rationality of structure of the present invention; 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 the said 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 the said 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 the said second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Like Fig. 4,5, shown in 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 the said 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 the said first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of the said 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; Said first nesa coating 4 is indium tin oxide conductive films, certainly, also can be the graphene conductive film, or the antimony tin conducting film.
Like Fig. 1,2,4,5,6,7,8,9, shown in 10; A kind of capacitive touch screen; Comprise flexible PCB 1 and transparent touch inductive layer 2; Said flexible PCB 1 is connected with the end of transparent touch inductive layer 2; (being that flexible PCB 1 is bonding through the end of different side's conducting resinl and transparent touch inductive layer 2) said transparent touch inductive layer 2 comprises the electrode 3 that several are evenly arranged, and several electrodes 3 of evenly arranging are electrically connected with the corresponding link of flexible PCB 1 through silver slurry line respectively; Said electrode 3 comprise several along Width and the first electrode 3-1 that evenly arranges with several alongst and the second electrode 3-2 that evenly arranges, each first electrode 3-1 is simultaneously vertical each other with each second electrode 3-2; The said first electrode 3-1 is followed in series to form through the first electrically conducting transparent line 3a by several first sensing units 3-1-1; The said second electrode 3-2 is followed in series to form through the second electrically conducting transparent line 3b by several second sensing units 3-2-1; The said 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 said I shape shape is by first vertical bar 31 parallel to each other and the 3rd vertical bar 33; And constitute perpendicular to second vertical bar 32 of first vertical bar 31 and the 3rd vertical bar 33, and the two ends of second vertical bar 32 are connected with the central part of first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
Like Fig. 1, shown in 2, in order to play a protective role, prevent that transparent touch inductive layer 2 from damage having taken place to transparent touch inductive layer 2, said 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 invention is a tempered glass, and tempered glass protective seam 10 is bonding through optical cement and transparent touch inductive layer 2.
Like Fig. 4,5,6, shown in 10, said 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 second nesa coating 7 and the 3rd nesa coating 7 ' that are respectively equipped with; Said several all are located on the outside surface of second nesa coating 7 along Width and first electrode 3-1 of evenly arranging, said several alongst and the second electrode 3-2 that evenly arranges all be located on the outside surface of the 3rd nesa coating 7 '.
Like Fig. 4,5,6,8,9, shown in 17, in order to make structure of the present invention more reasonable, the said 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; The said first electrically conducting transparent line 3a is vertical each other 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 invention and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Like Fig. 8, shown in 9; In order to make the rationality of structure of the present invention; 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 the said 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 the said 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 the said second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Like Fig. 4,5, shown in 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 the said 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 the said first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of the said 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; Said 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.
Like Fig. 1,2,4,5,6,7,8,9,11,12,13, shown in 14; A kind of capacitive touch screen; Comprise flexible PCB 1 and transparent touch inductive layer 2; Said flexible PCB 1 is connected with the end of transparent touch inductive layer 2; (being that flexible PCB 1 is bonding through the end of different side's conducting resinl and transparent touch inductive layer 2) said transparent touch inductive layer 2 comprises the electrode 3 that several are evenly arranged, and several electrodes 3 of evenly arranging are electrically connected with the corresponding link of flexible PCB 1 through silver slurry line respectively; Said electrode 3 comprise several along Width and the first electrode 3-1 that evenly arranges with several alongst and the second electrode 3-2 that evenly arranges, each first electrode 3-1 is simultaneously vertical each other with each second electrode 3-2; The said first electrode 3-1 is followed in series to form through the first electrically conducting transparent line 3a by several first sensing units 3-1-1; The said second electrode 3-2 is followed in series to form through the second electrically conducting transparent line 3b by several second sensing units 3-2-1; The said 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 said I shape shape is by first vertical bar 31 parallel to each other and the 3rd vertical bar 33; And constitute perpendicular to second vertical bar 32 of first vertical bar 31 and the 3rd vertical bar 33, and the two ends of second vertical bar 32 are connected with the central part of first vertical bar 31 and the central part of the 3rd vertical bar 33 respectively.
Like Fig. 1, shown in 2, in order to play a protective role, prevent that transparent touch inductive layer 2 from damage having taken place to transparent touch inductive layer 2, said 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 invention is a tempered glass, and tempered glass protective seam 10 is bonding through optical cement and transparent touch inductive layer 2.
Like Fig. 4,5,6,11,12,13, shown in 14; Said 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; Said several all are located on the outside surface of the 4th nesa coating 8-1 along Width and first electrode 3-1 of evenly arranging, said several alongst and the second electrode 3-2 that evenly arranges all be located on the outside surface of the 5th nesa coating 9-2; Said 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 through optical cement.
Like Fig. 4,5,6,8,9, shown in 17, in order to make structure of the present invention more reasonable, the said 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; The said first electrically conducting transparent line 3a is vertical each other 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 invention and the second electrically conducting transparent line 3b and do not connect between the two not at grade.
Like Fig. 8, shown in 9; In order to make the rationality of structure of the present invention; 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 the said 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 the said 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 the said second electrode 3-2 is 0.5 ~ 2 with the ratio of length H '.
Like Fig. 4,5, shown in 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 the said 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 the said first electrode 3-1 is 4 ~ 10mm; Spacing between the second adjacent sensing unit 3-2-1 of the said 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 perhaps are 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 a clear glass substrate.
Like Figure 11,12,13, shown in 14, the 5th nesa coating 9-2 of the 4th nesa coating 9-1 of said 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 foregoing description 1,2, flexible PCB described in 31 comprise MCU controller 1-1, filtering 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 filtering circuit 1-2 and the corresponding link of connector 1-4 respectively, and said MCU controller 1-1 also is electrically connected with the corresponding link of power protecting circuit 1-3 respectively with connector 1-4.
The first electrically conducting transparent line 3a according to the 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.
Principle of work of the present invention: during use; When if 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 the said 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; If finger touch is during to capacitive touch screen of the present invention; 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 produced this moment is Ct; Be the total capacitance Ct=Cx+Cf that the finger touch capacitance plate is produced, flexible PCB 1 is through the difference Cf of the electric capacity of this position of processing and detecting finger touch capacitance plate, thus the recognizing touch operation particular location.
It is to determine its computing formula Cf=ε * ε by finger touch to the contact area size of touch-screen that each second sensing unit 3-2-1 that alongst goes up of each the first sensing unit 3-1-1 on the Width of the said first electrode 3-1 and the second electrode 3-2 produces electric capacity (electrode) size.*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 of the present invention is adjacent connects through the first electrically conducting transparent line 3a; The second sensing unit 3-2-1 that the said second electrode 3-2 is adjacent connects through 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 under constant situation, the value of stray capacitance Cx is more little; And according to the computing formula of signal to noise ratio (S/N ratio) d: d=Cf/Cx can know that it is big more that signal to noise ratio (S/N ratio) d can become; Therefore, the present invention compares with traditional capacitive touch sensors, has improved signal to noise ratio (S/N ratio) d greatly, makes touch function of the present invention sensitiveer, and antijamming capability is stronger.
Like Fig. 8, shown in 9; The first electrode 3-1 of the present invention is bigger 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 second electrode 3-2 I shape shape alongst; And laterally evenly; Increased the contact area between the present invention and the finger greatly; When evenly moving about finger, realized that contact area changes uniform purpose, make the coordinate diagram of capacitance variation of sensing unit of I shape shape of the present invention more near para-curve mathematical model shown in figure 16; Guarantee that with this capacitive touch screen of the present invention 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 is detected 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; Under the constant situation of sensing unit (electrode) capacitance C; Resistance R is more little; The MCU controller 1-1 of flexible PCB 1 is fast more 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 present invention designed is just fast more.Traditional capacitive touch screen is all very harsh in ohmically requirement, and the resistance that a lot of producers require sensing unit (electrode) passage is below 10K; If the face resistance of the tin indium oxide of selecting for use (ITO) material is under 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; Has only the low tin indium oxide of employing face resistance (ITO) conductive material; And low tin indium oxide (ITO) conductive material of general face resistance not only price is very high, and because low tin indium oxide (ITO) the conductive material wound easy to break of resistance, also increased technology difficulty greatly; And the I shape sensing unit (electrode) that the present invention designed also can satisfy the requirement of whole passage resistance below 10K can be implemented in the above conductive material in face resistance 200 Europe the time, therefore, greatly reduces its production cost.
The present invention 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 present invention has also reduced the difficulty of explained hereafter.
Capacitive touch screen of the present invention 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 techniques field yet.
Claims (13)
1. capacitive touch screen; Comprise flexible PCB (1) and transparent touch inductive layer (2); Said flexible PCB (1) is connected with the end of transparent touch inductive layer (2); Said transparent touch inductive layer (2) comprises the electrode (3) that several are evenly arranged, and several electrodes (3) of evenly arranging are electrically connected with the corresponding link of flexible PCB (1) respectively; It is characterized in that:
A, said electrode (3) comprise several along Width and first electrode (3-1) evenly arranged with several alongst and second electrode of evenly arranging (3-2), each first electrode (3-1) is mutual vertical with each second electrode (3-2) simultaneously;
B, said first electrode (3-1) are followed in series to form through the first electrically conducting transparent line (3a) by several first sensing units (3-1-1);
C, said second electrode (3-2) are followed in series to form through the second electrically conducting transparent line (3b) by several second sensing units (3-2-1);
D, said first sensing unit (3-1-1) and second sensing unit (3-2-1) all are sensing units of I shape shape;
The sensing unit of e, said I shape shape is by first vertical bar (31) parallel to each other and the 3rd vertical bar (33); And constitute perpendicular to second vertical bar (32) of first vertical bar (31) and the 3rd vertical bar (33), and the two ends of second vertical bar (32) are connected with the central part of first vertical bar (31) and the central part of the 3rd vertical bar (33) respectively.
2. capacitive touch screen according to claim 1 is characterized in that: said 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 is characterized in that: said transparent touch inductive layer (2) also comprises the first transparent insulation base material (5), and first nesa coating (4) that is provided with of the one side of the first transparent insulation base material (5); Said several along Width and first electrode (3-1) evenly arranged with several alongst and evenly second electrode (3-2) of layout all be located on the outside surface of first nesa coating (4).
4. capacitive touch screen according to claim 1; It is characterized in that: said 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) second nesa coating (7) and the 3rd nesa coating (7 ') that are respectively equipped with; Said several all are located on the outside surface of second nesa coating (7) along Width and first electrodes (3-1) of evenly arranging, said several alongst and second electrode of evenly arranging (3-2) 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: said 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); Said several all are located on the outside surface of the 4th nesa coating (8-1) along Width and first electrodes (3-1) of evenly arranging, said several alongst and second electrode of evenly arranging (3-2) all be located on the outside surface of the 5th nesa coating (9-2); Said the 4th transparent insulation base material (8-1), the 4th nesa coating (9-1), first electrode (3-1) and the 5th transparent insulation base material (8-2), the 5th nesa coating (9-2), second electrode (3-2) are bonded as one.
6. according to claim 1 or 3 or 4 or 5 described capacitive touch screens, it is characterized in that: the said first electrically conducting transparent line (3a) is that the I shape central axis along first electrode (3-1) is connected; The second electrically conducting transparent line (3b) is that the I shape central axis along second electrode (3-2) is connected; The said first electrically conducting transparent line (3a) is vertical each other 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. according to claim 1 or 3 or 4 or 5 described capacitive touch screens, it is characterized in that: the width L ' of 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 said first electrode (3-1) and the ratio of length H and second electrode (3-2) and being in equal proportions of length H '.
8. according to claim 1 or 3 or 4 or 5 described capacitive touch screens, it is characterized in that: the spacing between adjacent first sensing unit (3-1-1) of said first electrode (3-1) equates with spacing between adjacent second sensing unit (3-2-1) of second electrode (3-2).
9. capacitive touch screen according to claim 7 is characterized in that: the width L of first sensing unit (3-1-1) of the I shape shape of said 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 said second electrode (3-2) is 0.5 ~ 2 with the ratio of length H '.
10. capacitive touch screen according to claim 8 is characterized in that: the spacing between adjacent first sensing unit (3-1-1) of said first electrode (3-1) is 4 ~ 10mm; Spacing between adjacent second sensing unit (3-2-1) of said second electrode (3-2) is 4 ~ 10mm.
11. the structure of capacitive touch screen sensor according to claim 5 is characterized in that: said the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2) perhaps are 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 a 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 said the 4th transparent insulation base material (8-1) and the 5th transparent insulation base material (8-2) is in the same way;, perhaps be reverse perhaps in opposite directions.
13. the structure of capacitive touch screen sensor according to claim 1; It is characterized in that: said 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 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 said MCU controller (1-1) also is 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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| CN201210340476.0A CN102819375B (en) | 2012-09-14 | 2012-09-14 | Capacitive touch screen |
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| 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 |
| 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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| CN102819375B (en) | 2016-05-04 |
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