CN209486649U - A kind of capacitance touch screen with close to detecting function - Google Patents
A kind of capacitance touch screen with close to detecting function Download PDFInfo
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- CN209486649U CN209486649U CN201920068485.6U CN201920068485U CN209486649U CN 209486649 U CN209486649 U CN 209486649U CN 201920068485 U CN201920068485 U CN 201920068485U CN 209486649 U CN209486649 U CN 209486649U
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Abstract
A kind of capacitance touch screen with close to detecting function, including substrate, surface thereof is equipped with multiple cell electrodes, and it includes the main detecting area of multiple cell electrodes that at least definition, which has one,；Belonging between multiple cell electrodes of same main detecting area equipped with switch connection, switch is connected with first switch, and when first switch disconnects, cell electrode is mutually indepedent, and when first switch connection, cell electrode is connected with each other to constitute a main electrode；And further include detection circuit, when first switch disconnects, detection circuit is connect with each unit electrode, to detect touch action of the finger on substrate according to the capacitance variations of each unit electrode；And when first switch connect when, detection circuit connect with each main electrode, with according to the direct-to-ground capacitance of each main electrode variation come detect hand in front of the touch screen side movement.This capacitance touch screen, the distance of detection farther out, can detect the hand longer-distance movement in side in front of the touch screen.
Description
Technical field
The utility model relates to a kind of capacitance touch screen, especially a kind of capacitance touch screen with close to detecting function.
Background technique
Capacitance touch screen generally comprises substrate, and an at least surface is equipped with multiple induction electrodes, the width one of induction electrode
As between 0.5 1.2cm, touch screen can according to the direct-to-ground capacitance (self-capacitance) of induction electrode change or adjacent induction electrode
Between mutual capacitance change to detect finger in the touch action on its surface, be achieved in touch sensing function.
In order to expand the application of capacitance touch screen, it is thus proposed that be added in touch screen and touched when hand is close not in contact with arriving
Can also be arrived by touch screen induction when touching the surface of screen close to detecting function.However, this at present be usually close to detecting function
Self-capacitance by directly detecting each induction electrode change and reinforce detection circuit signal analyze come what is realized, incuded
The limitation of electrode width, the distance that can be detected is very short, thus it is square longer-distance in front of the touch screen to detect hand
Movement, application be not extensive.
Summary of the invention
The purpose of this utility model is to provide a kind of capacitance touch screen with close to detecting function, detection distance compared with
Far, capable of detecting hand, the longer-distance movement in side, used technical solution are as follows in front of the touch screen:
A kind of capacitance touch screen with close to detecting function, it is characterized in that:
Including substrate, surface thereof is equipped with multiple cell electrodes, and it includes the master of multiple cell electrodes that at least definition, which has one,
Detecting area；
Belong between multiple cell electrodes of same main detecting area equipped with switch connection, the switch is connected with first and opens
It closes, when the first switch disconnects, the cell electrode is mutually indepedent, and when the first switch is connected, the unit
Electrode is connected with each other to constitute a main electrode；And
It further include detection circuit, when the first switch disconnects, the detection circuit is connect with each unit electrode, with root
Touch action of the finger on substrate is detected according to the capacitance variations of each unit electrode；And when the first switch is connected,
The detection circuit is connect with each main electrode, detects hand side in front of the touch screen to change according to the direct-to-ground capacitance of each main electrode
Movement.
Specifically, the capacitance touch screen can only include the substrate, or the substrate and other plate bodys are (such as
Protection board) combination.The medial surface or lateral surface (when being covered with protection board) in substrate can be set in the cell electrode, by
It is generally in the body region of capacitance touch screen transparent, thus cell electrode is generally made using transparent conductive material,
Such as graphically formed using ito thin film；Cell electrode is generally electrode block, the electrode strip of 0.5 1.2cm width, or by
Electrode array made of the electrode block of 0.5 1.2cm width is connected with each other, is mutually perpendicular to and intersects be sense as cell electrode is two groups
Answer the electrode array (X, Y electrode string) of array.Said units electrode is generally connected by perimeter circuit, and perimeter circuit can be and list
First electrode is in the conducting wire of same substrate surface, especially conducting wire made of metal thin-film pattern.
Main detecting area be substrate surface include multiple cell electrodes, one of especially multiple cell electrodes being mutually close to
Region, area shared by the cell electrode that thus main detecting area can be contained by it are defined, such as: when a main detecting area
Cell electrode be cross one another X, Y electrode string when, the main detecting area can correspond to its X, Y electrode string intersect made of induction
The occupied area of array.By the combination of multiple cell electrodes, the width of main detecting area is big far beyond cell electrode, so that carrying out
Close to when detection, detection circuit can obtain enough signals, to detect farther distance.The substrate can only have one
Main detecting area can also have multiple main detecting areas.
The switch connection may be provided in perimeter circuit, can also be drawn by perimeter circuit and external circuit is arranged in
In (such as FPC line, external circuits plate, external circuit system or computer system)；It is preferred that the main part of the switch connection
Set up separately and set in external circuit, thus first switch can be by chip, and the analog switch chip of such as integrated multiple switch comes real
It is existing --- analog switch chip can according to the electric signal being input in chip, to control being switched on or switched off for each first switch,
The multiple cell electrodes for belonging to certain main detecting area are connected and constitute main electrode to realize.
The main body of the detection circuit can be the circuit for detecting each unit electrode or main electrode capacitor, specifically,
Its main body may include the circuit or chip with touch detection or capacitance detecting function.In addition to this, the detection electricity
Road may also include certain control system and/or analysis system, the control system being such as made of the soft and hardware of single-chip microcontroller or computer
System and/or analysis system, in order to which switch each to first switch etc. in the detection process of touch screen carries out automatically controlling, and
The hand position of side or movement in front of the touch screen are analyzed according to detected capacitance.
In a concrete scheme of the utility model, the detection circuit includes the first detection circuit and the second detection electricity
Road.Wherein, it is square close to movement in front of the touch screen to be used to detect finger for the first detection circuit, is generally capacitive detection circuit；
Each switching circuit can respectively, be connected directly to the first detection circuit, in order to detect the direct-to-ground capacitance of each main electrode.Second detection
Circuit is touch detection circuit, such as includes the circuit of capacitive touch chip, is used to detect the touching of finger on the touchscreen
Movement, each unit electrode can directly be connect with the second detection circuit, can also pass through other switch (such as second switch) and second
Detection circuit connection, in the case where first switch is switching switch, each unit electrode is also using first switch first and second
It is switched between detection circuit, above-mentioned each switch can be realized by analog switch chip, and pass through single-chip microcontroller or computer
It is controlled.
It is being not sensed by finger or conductor is close under normal circumstances, the first switch can be held on, thus
The cell electrode of main detecting area is linked to each other to form main electrode, and when hand appears in front of touch screen, main electrode is over the ground
Capacitor (below-mentioned main electrode capacitor is its direct-to-ground capacitance) is affected by it and changes, and passes through the first detection electricity
The detection on road can be detected, wherein since the width of main electrode is larger, hand is just wide not less than main electrode in front of the touch screen
It (actually can reach the distance of 5-20 times of main electrode width) at the distance of degree, the capacitor of main electrode can be impacted
And apparent variation is brought it about, and since the capacitor of main electrode is larger, it is more easier to be detected by the first detection circuit
Out, main electrode can detect farther distance in front of touch screen as a result,.
In the practical work process of touch screen, also certain threshold value can be set for the capacitance variations of each main electrode, when
When the capacitance variations of any main electrode are more than threshold value, detection circuit thinks that hand (finger) is very close or touches touch screen
Surface thereby turns off first switch, and dismissing each main electrode is cell electrode, and the second detection circuit is according to the electricity of each unit electrode
Hold variation to detect the touch action of finger on the touchscreen, resolution ratio is higher.
In a preferred embodiment of the utility model, the substrate further includes an at least blind zone, and the blind zone is at least
A side of one main detecting area is set, and the blind zone contains at least one the cell electrode as bucking electrode, when described
When first switch is connected, the bucking electrode ground connection (can be switched and be realized by the above-mentioned first or second).Blind zone can reduce master
The interference that electrode is subject to, to improve the distance and accuracy of detection.
In a preferred embodiment of the utility model, the substrate also includes at least one secondary detecting area, the pair detecting area
Area be less than each main detecting area, it is described pair detecting area include at least a cell electrode as auxiliary electrode；It opens when described first
When closing connection, the detection circuit also connect with auxiliary electrode and (can be switched and be realized by the above-mentioned first or second), with further root
According to the difference of main electrode and auxiliary electrode capacitance variations, to detect finger square movement in front of the touch screen.
Specifically, the major and minor detecting area is set side by side, and the area of preferably main detecting area is no less than 5 times of secondary detecting area,
Or the quantity of the main detecting area cell electrode that is included is no less than 5 times of secondary detecting area, as a result, before hand is in touch screen
The capacitor of Fang Shi, main electrode and auxiliary electrode can change, but there is distinguished by major and minor electrode different area for this variation
The nonlinear attenuation rule of decision, detection circuit further can eliminate the external world according to the difference of this nonlinear attenuation law
Interference so that signal is more clear, detection range is farther.It is further preferred that at least one secondary detecting area includes multiple lists
First electrode also is provided with switch connection between the cell electrode, and the switch connection also is provided with first switch, opens when described first
When shutdown is opened, the cell electrode is mutually indepedent, and when the first switch is connected, the cell electrode is connected with each other with structure
At auxiliary electrode.
In a preferred embodiment of the utility model, the capacitance touch screen include as main detecting area left detecting area and
Right detecting area, when the first switch is connected, the cell electrode of left and right detecting area respectively constitutes the left electrode as main electrode
With right electrode, the detection circuit detects the capacitance variations of left and right electrode respectively, and (such as according to the capacitance variations of left and right electrode
The ratio of left and right electrode capacitance variation) calculate hand square left-right position in front of the touch screen.In the another excellent of the utility model
It selects in scheme, the capacitance touch screen includes the upper detecting area and lower detecting area as main detecting area, when the first switch connects
When logical, the cell electrode of upper and lower detecting area respectively constitutes top electrode and lower electrode as main electrode, the detection circuit difference
The capacitance variations of upper and lower electrode are detected, and according to the capacitance variations of upper and lower electrode (ratio of such as upper and lower electrode capacitance variation)
To calculate hand square upper and lower position in front of the touch screen.
In the another preferred embodiment of the utility model, the capacitance touch screen includes constitute the arrangement of sphere of movements for the elephants shape the
One, second, third and the 4th main detecting area, are respectively upper left, upper right, bottom right and the lower left region of substrate, when described first
When switch connection, the cell electrode of the first, second, third and fourth main detecting area is separately connected as first, second, third and
Four main electrodes；The detection circuit detects the capacitance variations of the first, second, third and fourth main electrode respectively, and detects according to this
Hand square position up and down in front of the touch screen.Specifically, it can define the sum that upper capacitor is the first, second main electrode capacitor,
Lower capacitor be third, the sum of the 4th main electrode capacitor, left capacitor be the first, the 4th main electrode capacitor sum, right capacitor be second,
The sum of third main electrode combination capacitor；Detection circuit according to the upper and lower capacitance variations (ratios of such as upper and lower capacitance variations) come
Calculate hand square upper and lower position in front of the touch screen, and according to left and right capacitance variations (ratios of such as left and right capacitance variations) come
Calculate hand square left-right position in front of the touch screen.It is further preferred that further including blind zone, the blind zone is each main detection
" ten " interword gap region between area, contains at least one the cell electrode as bucking electrode, when the first switch connects
When logical, the bucking electrode is grounded (can realize by above-mentioned second switch).
The utility model has the beneficial effects that:
In provided capacitance touch screen, multiple cell electrodes dynamic of a main detection zone will be belonged to using switching circuit
Ground connects, and when switching circuit is connected, cell electrode group is combined into greater area of main electrode, main electrode due to area compared with
Greatly, more remote hand motion in front of touch screen can be detected, is connect more at a distance with realizing according to the variation of its capacitor
Nearly detecting function.In addition to this, when switching circuit disconnects, each unit circuit is mutually indepedent, and capacitance touch screen is equivalent to commonly
Capacitance touch screen, finger can be detected in the touch action of touch screen surface with higher resolution ratio.
The technical solution of the utility model is described further below by way of drawings and examples.
Detailed description of the invention
Fig. 1 is the shape of the capacitance touch screen of embodiment one, structural schematic diagram；
Fig. 2 is the schematic diagram of the main detecting area of the capacitance touch screen of embodiment one, blind zone；
Fig. 3 is the capacitance touch screen of embodiment one, and the schematic diagram of part detection circuit (only draws a main electrode and screen
The corresponding circuits of electrode are covered, each port in top with multiple cell electrodes for connecting)；
Fig. 4 is the capacitance touch screen of embodiment one, close to detecting function schematic diagram；
Fig. 5 is the capacitance touch screen of embodiment one, and the schematic diagram of main electrode (has ignored each unit electricity in main electrode
Pole)；
Fig. 6 is the capacitance touch screen of embodiment one, the workflow schematic diagram of detection circuit；
Fig. 7 is the capacitance touch screen of embodiment one, the direct-to-ground capacitance of certain main electrode and the C of hand distancei- L relationship is shown
It is intended to；
Fig. 8 is the capacitance touch screen of embodiment two, and the schematic diagram of part detection circuit (only draws a main electrode and screen
Cover the corresponding circuits of electrode), each port in top is connect with each unit electrode；
Fig. 9 is the capacitance touch screen of embodiment two, the signal of certain main electrode, the amplified signal of auxiliary electrode and hand distance
Relation schematic diagram；
Figure 10 is the capacitance touch screen of embodiment two, the pass of the differential signal and hand distance of certain main electrode and auxiliary electrode
It is schematic diagram.
Specific embodiment
Embodiment one
As shown in Figure 1 and Figure 2, there is the capacitance touch screen 100 close to detecting function, including mutual by full coating technique
The outer surface of the transparent protection plate 10 and transparent glass substrate 20 clinged, substrate 20 is graphically formed equipped with multiple by ito thin film
Cell electrode 30, cell electrode 30 is the X as made of electrode block that multiple width are 0.6mm (0.5 1.2cm) concatenation
Electrode array and Y electrode string, most X, Y electrode string, which intersect, constitutes the first, second, third, fourth induction of sphere of movements for the elephants shape arrangement
Matrix is respectively upper left, upper right, bottom right and the lower left region of substrate, defines the first, second, third, fourth induction matrix
Region is respectively the first, second, third, fourth main detecting area 410,420,430,440." ten " word between main detecting area
Gap area 450 is blind zone comprising four cell electrodes 45 as bucking electrode.The unit electricity that main detecting area is included
Number of poles is 5 times of blind zone or more (area is also 5 times or more).
As shown in Figure 1, Figure 3, the side of touch screen 100 is equipped with FPC wiring 50, and each unit electrode 30 passes through metallic film figure
Perimeter circuit 31 made of shape is connected in wiring 50, wiring 50 be equipped with analog switch chip 51, capacitance detecting chips 52,
Touch chip 53 and singlechip chip 54.Each unit electrode 30 is directly connected to touch chip 53, and belongs to same main detection
Multiple cell electrodes in area then pass through first switch 511 and are connected to switch connection 521, and each switch connection 521 is connected to electricity
Hold detection chip 52, each bucking electrode 45 is grounded by first switch 512, and first switch 511,512 is integrated in analog switch core
In piece 51, singlechip chip 54 is for controlling analog switch chip 51 to realize the on-off of each first switch 511,512.
As shown in Fig. 4, Fig. 5, Fig. 6, by the control of singlechip chip 51, be not sensed by hand 200 it is close one
As in the case of, first switch 511,512 is held on, thus the cell electrode of the first, second, third, fourth main detecting area point
Not Lian Jie, group be combined into each main electrode 40 comprising the first main electrode 41, the second main electrode 42, third main electrode 43 and the 4th
Main electrode 44, direct-to-ground capacitance are respectively C1、C2、C3、C4, and bucking electrode 45 is grounded by first switch 512.
Since each main electrode 40 is connect by respective switch connection 521 with capacitance detecting chips 52, when hand 200 occurs
In the front of touch screen 100, and at 15 times of substantially each main electrode width of distance L, the capacitor C of each main electrode 40i(i=1、2、
3 or 4) be affected by it and change, pass through the detection of capacitance detecting chips 52, can be obtained each main electrode 40 capacitor and
Its changing value, and further calculated by singlechip chip 54: upper capacitor Cup=C1+C2；Lower capacitor Cdown=C3+C4；Left capacitor
Cleft=C1+C4；And right capacitor Cright=C2+C3；And according to the ratios delta C of upper and lower capacitance variations valueup/ΔCdownTo calculate hand
The square upper and lower position in front of the touch screen of portion 200, the ratios delta C of the changing value of left and right capacitorleft/ΔCrightTo calculate hand 200
Thus square left-right position in front of the touch screen exports the hanging position of hand 200.
As shown in fig. 6, can also be arranged in the program setting of singlechip chip 54 for the capacitance variations of each main electrode 40
Certain threshold value Cth, as the capacitance change, Δ C of any main electrodeiMore than threshold value CthWhen, first switch 511 is closed so that each main electricity
It is cell electrode 30 that pole 40, which is dismissed, closes first switch 512 so that each bucking electrode is earth-free, and starts touch chip 53, with
Touch action of the hand (finger) 200 on touch screen 100 is detected according to the capacitance variations of each unit electrode 30.
It in addition to this, can also be according to CiValue and Ci- L relationship (as shown in fig. 7, being obtained by experiment or experience),
Exporting hand 200 and 100 distance L of touch screen (can be respectively by the capacitance variations C of each main electrode 40iValue calculates
Respective LiValue, is finally minimized).
In addition to this, in other schemes of the present embodiment, in order to avoid harassing for signal, each unit electrode 30 can also lead to
It crosses a second switch to connect with touch chip, when above-mentioned each first switch is opened, second switch is closed；Or it is in first switch
In the case where switching switch, each unit electrode also switches connection using first switch between the first and second detection circuit, and described the
One, two switches can be realized by analog switch chip, and be controlled by singlechip chip 54 or other computers.
Embodiment two
On the basis of example 1, its blind zone 450 is newly defined as secondary detecting area, and former bucking electrode 45 is changed
For auxiliary electrode, then the embodiments of the present invention two are constituted.
Specifically, as shown in figure 8, former bucking electrode 45 is changed to connect by first switch 512 with capacitance detecting chips 52
Rather than be grounded, thus it is auxiliary electrode.Each main electrode 40 is being carried out close to when detection, also by connect first switch 512 with
Make auxiliary electrode 45 while carrying out approaching detection, the signal that each main electrode 40 and auxiliary electrode 45 are detected is respectively S1、S2, there is S1=
S1A+S1N, S2=S2A+S2N, S1A、S2AIn the signal respectively detected, reflect that hand is in front of touch screen and leads to main electricity
Part (such as Δ C of 40 direct-to-ground capacitance of pole variationi) and 45 direct-to-ground capacitance changing unit of auxiliary electrode, S1N、S2NRespectively detect
Noise section in signal.
Since more each main electrode 40 of the area of each auxiliary electrode 45 is small, when hand appears in front of touch screen, with hand
The increase of distance L, S2ANonlinear attenuation to be significantly faster than that S1A, and S1N、S2NIt is unrelated with L.It as a result, as shown in figure 9, can will be secondary
The signal S of electrode 452It is enlarged into S2’=kS2, k is amplification coefficient, and value makes kS2N=S1N, and generally have kS2A<S1A(according to
The nonlinear attenuation rule of major and minor electrode), as shown in Figure 10, calculate differential signal SD:
SD=S1-S2N’=S1A+S1N-kS2A-kS2N=S1A-kS2A
Most noise can be eliminated, to improve the ratio of normal signal.So that the signal detected is more
It is clear to add, it is thus possible to detect farther distance in front of touch screen.
In addition, it should be noted that, the specific embodiments described in this specification, each section title etc. can not
Together, all equivalent or simple changes done according to structure, feature and principle described in the concept of the patent of the utility model are included in this
In the protection scope of utility model patent.Those skilled in the art of the present invention can be to described specific reality
Example is applied to do various modifications or additions or be substituted in a similar manner, structure without departing from the utility model or
Beyond the scope defined by this claim, it all should belong to the protection range of the utility model.
Claims (18)
1. a kind of capacitance touch screen with close to detecting function, it is characterized in that:
Including substrate, surface thereof is equipped with multiple cell electrodes, and it includes the main detection of multiple cell electrodes that at least definition, which has one,
Area；
Belonging between multiple cell electrodes of same main detecting area equipped with switch connection, the switch is connected with first switch, when
When the first switch disconnects, the cell electrode is mutually indepedent, and when the first switch is connected, the cell electrode phase
It connects to constitute a main electrode；And
It further include detection circuit, when the first switch disconnects, the detection circuit is connect with each unit electrode, according to each
The capacitance variations of cell electrode detect touch action of the finger on substrate；And when the first switch is connected, it is described
Detection circuit is connect with each main electrode, square dynamic in front of the touch screen to detect hand to be changed according to the direct-to-ground capacitance of each main electrode
Make.
2. capacitance touch screen as described in claim 1, it is characterized in that: the cell electrode is the electrode of 0.5 1.2cm width
Block, electrode strip, or the electrode array as made of the electrode block interconnection of 0.5 1.2cm width.
3. capacitance touch screen as described in claim 1, it is characterized in that: the substrate includes multiple main detecting areas.
4. capacitance touch screen as described in claim 1, it is characterized in that: the detection circuit includes the first detection circuit and second
Detection circuit, it is square close to movement in front of the touch screen that the first detection circuit is used to detect finger, is capacitive detection circuit, respectively opens
It closes route and is respectively connected to the first detection circuit；Second detection circuit is touch detection circuit, is used to detect finger and is touching
Touch action on screen.
5. capacitance touch screen as claimed in claim 4, it is characterized in that: each unit electrode is directly connect with the second detection circuit.
6. capacitance touch screen as claimed in claim 4, it is characterized in that: each unit electrode passes through other second switch and second
Detection circuit connection.
7. capacitance touch screen as claimed in claim 4, it is characterized in that: the first switch is switching switch, each unit electrode
It is switched between the first and second detection circuit by first switch.
8. capacitance touch screen as described in claim 1, it is characterized in that: the capacitance variations threshold value equipped with each main electrode of correspondence,
When the variation of the direct-to-ground capacitance of any main electrode is more than its threshold value, first switch is closed, dismissing each main electrode is cell electrode.
9. capacitance touch screen as described in claim 1, it is characterized in that: the substrate further includes an at least blind zone, the screen
A side that area is arranged at a main detecting area is covered, the blind zone contains at least one the unit electricity as bucking electrode
Pole, when the first switch is connected, the bucking electrode ground connection.
10. capacitance touch screen as described in claim 1, it is characterized in that: the substrate also includes at least one secondary detecting area, described
The area of secondary detecting area is less than each main detecting area, and the pair detecting area includes at least a cell electrode as auxiliary electrode；Work as institute
When stating first switch connection, the detection circuit is also connect with auxiliary electrode, further to be become according to main electrode and auxiliary electrode capacitor
The difference of change, to detect finger square movement in front of the touch screen.
11. capacitance touch screen as claimed in claim 10, it is characterized in that: the area of the main detecting area is no less than secondary detecting area
5 times.
12. capacitance touch screen as claimed in claim 10, it is characterized in that: the number for the cell electrode that the main detecting area is included
Amount is no less than 5 times of secondary detecting area.
13. capacitance touch screen as claimed in claim 10, it is characterized in that: at least one secondary detecting area includes multiple cell electrodes,
It also is provided with switch connection between the cell electrode of the pair detecting area, the switch connection also is provided with first switch, when described the
When one switch disconnects, the cell electrode of the pair detecting area is mutually indepedent, and when the first switch is connected, the secondary detection
The cell electrode in area is connected with each other to constitute auxiliary electrode.
14. capacitance touch screen as described in claim 1, it is characterized in that: the capacitance touch screen includes as main detecting area
Left detecting area and right detecting area, when the first switch is connected, the cell electrode of left and right detecting area is respectively constituted as main electricity
The left electrode and right electrode of pole, the detection circuit detect the capacitance variations of left and right electrode respectively, and according to left and right electrode
Capacitance variations calculate hand square left-right position in front of the touch screen.
15. capacitance touch screen as described in claim 1, it is characterized in that: the capacitance touch screen includes as main detecting area
Upper detecting area and lower detecting area, when the first switch is connected, the cell electrode of upper and lower detecting area is respectively constituted as main electricity
The top electrode of pole and lower electrode, the detection circuit detect the capacitance variations of upper and lower electrode respectively, and according to upper and lower electrode
Capacitance variations calculate hand square upper and lower position in front of the touch screen.
16. capacitance touch screen as described in claim 1, it is characterized in that: the capacitance touch screen includes constituting sphere of movements for the elephants shape row
First, second, third and fourth main detecting area of column, is respectively upper left, upper right, bottom right and the lower left region of substrate, works as institute
When stating first switch and connecting, the cell electrode of the first, second, third and fourth main detecting area is separately connected as first, second, the
Three and the 4th main electrode；The detection circuit detects the capacitance variations of the first, second, third and fourth main electrode respectively, and according to
This detection hand square position up and down in front of the touch screen.
17. capacitance touch screen as claimed in claim 16, it is characterized in that:
Capacitor is the sum of the first, second main electrode capacitor in definition, and lower capacitor is third, the sum of the 4th main electrode capacitor, left electricity
Hold the sum for the first, the 4th main electrode capacitor, right capacitor is the sum of second, third main electrode combination capacitor；And
Detection circuit calculates hand square upper and lower position in front of the touch screen according to the upper and lower capacitance variations；According to left and right electricity
Hold variation to calculate hand square left-right position in front of the touch screen.
18. capacitance touch screen as claimed in claim 16, it is characterized in that: it further include blind zone, the blind zone is each main spy
" ten " the interword gap region between area is surveyed, the cell electrode as bucking electrode is contained at least one, when the first switch
When connection, the bucking electrode ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920068485.6U CN209486649U (en) | 2019-01-16 | 2019-01-16 | A kind of capacitance touch screen with close to detecting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920068485.6U CN209486649U (en) | 2019-01-16 | 2019-01-16 | A kind of capacitance touch screen with close to detecting function |
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| Publication Number | Publication Date |
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| CN209486649U true CN209486649U (en) | 2019-10-11 |
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