CN103324366A - Capacitor detection device and capacitive touch system applying same - Google Patents

Capacitor detection device and capacitive touch system applying same Download PDF

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Publication number
CN103324366A
CN103324366A CN2012100745956A CN201210074595A CN103324366A CN 103324366 A CN103324366 A CN 103324366A CN 2012100745956 A CN2012100745956 A CN 2012100745956A CN 201210074595 A CN201210074595 A CN 201210074595A CN 103324366 A CN103324366 A CN 103324366A
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node
time
voltage
electric capacity
capacitance
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CN103324366B (en
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何闿廷
洪国强
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MediaTek Inc
MStar Semiconductor Inc Taiwan
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MStar Software R&D Shenzhen Ltd
MStar Semiconductor Inc Taiwan
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Abstract

The invention provides a capacitor detection device which is connected with a to-be-detected capacitor and comprises a first capacitor, a second capacitor, a control module and a judgment module, wherein the first capacitor and the second capacitor are connected to the to-be-detected capacitor through an input node; the control module is used for providing a first cross-voltage change for the first capacitor and a second cross-voltage change for the to-be-detected capacitor, accordingly, the second capacitor produces a third cross-voltage change; the first cross-voltage change and the second cross-voltage change enable a charge entering the input node from the first capacitor to be identical with a charge entering the to-be-detected capacitor from the input node in positive and negative electrodes; and the judgment module judges the capacitance of the to-be-detected capacitor according to the capacitance of the first capacitor, the capacitance of the second capacitor, the first cross-voltage change, the second cross-voltage change and the third cross-voltage change.

Description

Capacitance detecting device and use the capacitance touch control system of this capacitance detecting device
Technical field
The present invention is relevant with measuring technique, and especially relevant with the improvement of circuit of measuring capacitance.
Background technology
Along with science and technology is showing improvement or progress day by day, in recent years all more and more hommizations of the operation interface of various electronic products.For example, see through Touch Screen, the user can directly make program, input message/literal/pattern with finger or pointer in on-screen options, saves the trouble of input medias such as using keyboard or button.In fact, Touch Screen normally is comprised of induction panel and the display that is arranged at the induction panel rear.The position that electronic installation can be touched on induction panel according to the user, and the picture that presents of display are at that time judged the meaning of this time touching and are carried out corresponding operating result.
With regard to capacitive touch device, user's touching can affect the electric field of touched point, and then causes corresponding capacitance variation.Measure sensitivity and the correctness so most important of the circuit of capacitance variation.Block 100 among Fig. 1 (A) is a capacitive detection circuit example.This testing circuit comprises operational amplifier 12, weld pad (pad) 14, back coupling capacitor C fb, two the first switch SW 1 and a second switch SW2.Weld pad 14 is in order to be connected to operational amplifier 12 with the testing capacitance Cx of position in testing circuit 100 outsides.Testing capacitance Cx position is in induction panel, and whether meeting is touched along with the user and changed.
In the phase one of testing process, two the first switch SW 1 are set to path, and second switch SW2 is set to and opens circuit; Circuit among Fig. 1 (A) is equal to the circuit shown in Fig. 1 (B).In this situation, the voltage of the output terminal of operational amplifier 12 (Vout) and positive-negative input end all can equal reference voltage VL.Therefore back coupling capacitor C fb is discharged to does not have electric charge, and testing capacitance Cx is charged to have electric charge Cx*VL.Subsequently, in the subordinate phase of testing process, two the first switch SW 1 are switched to and open circuit, and second switch SW2 is switched to path; Circuit among Fig. 1 (A) is equal to shown in Fig. 1 (C).In this situation, the voltage of the positive-negative input end of operational amplifier 12 all can become reference voltage VH.Electric charge is after redistributing, and the voltage of output terminal can be expressed as follows:
Vout = VH + ( VH - VL ) * Cx Cfb . - - - ( 1 )
Because it is known that the numerical value of reference voltage VL, VH and back coupling capacitor C fb is all, can extrapolate the size of testing capacitance Cx according to output voltage V out.Be the background capacitance Cbg that namely exists before not affected by the user and the summation of touching the capacitance change Csig of generation because of the user if testing capacitance Cx further disassembled, formula (1) can be rewritten as:
Vout = VH + ( VH - VL ) * Cbg Cfb + ( VH - VL ) * Csig Cfb . - - - ( 2 )
In fact background capacitance Cbg is roughly definite value.Therefore, main measuring object is capacitance change Csig.Out is saturated for fear of output voltage V, and back coupling capacitor C fb can not be designed to be too little.Yet, can be found out by last of formula (2), feedback capacitor C fb larger, the resolution of measuring capacitance change Csig is just poorer.
Summary of the invention
For addressing the above problem, several embodiment of the present invention propose a kind of new capacitance detecting device and use the capacitance touch control system of this capacitance detecting device.By suitably supplying the quantity of electric charge that testing capacitance needs feedbacking outer newly-increased electric capacity of electric capacity in the electric charge re-allocation process, the capacitance detecting device of several embodiment can overcome and is difficult to take into account the measurement resolution in the prior art and avoids the saturated problem of output voltage according to the present invention.It should be noted that and to adopt that the stray capacitance between the connecting line and screen layer reaches the effect of saving chip area by this as this newly-increased electric capacity on the primary circuit plate.
A specific embodiment according to the present invention is a kind of capacitance detecting device, is connected in a testing capacitance, and this capacitance detecting device comprises one first electric capacity, one second electric capacity, a control module and a judge module.This first electric capacity and this second electric capacity see through an input node and are connected to this testing capacitance.This control module is in order to providing this first electric capacity one first cross-pressure to change, and provides this testing capacitance one second cross-pressure to change, and makes by this this second electric capacity produce one the 3rd cross-pressure and changes.This first cross-pressure changes with this second cross-pressure variation makes the electric charge that flows to the electric charge of this input node and flow into this testing capacitance from this input node from this first electric capacity positive and negative identical.This judge module is judged the electric capacity of this testing capacitance in order to change according to the electric capacity of this first electric capacity, electric capacity, this first cross-pressure variation, this second cross-pressure variation and the 3rd cross-pressure of this second electric capacity.
Another specific embodiment according to the present invention is a kind of capacitance touch control system, wherein comprises a display, a plurality of inductance capacitance, one first electric capacity, one second electric capacity, a control module and a judge module.These a plurality of inductance capacitances are separately corresponding to the provider location on this display.This first electric capacity and this second electric capacity see through an input node be connected to these a plurality of inductance capacitances one of them as a testing capacitance.This control module is in order to providing this first electric capacity one first cross-pressure to change, and provides this testing capacitance one second cross-pressure to change, and makes by this this second electric capacity produce one the 3rd cross-pressure and changes.This first cross-pressure changes with this second cross-pressure variation makes the electric charge that flows to the electric charge of this input node and flow into this testing capacitance from this input node from this first electric capacity positive and negative identical.This judge module is judged the electric capacity of this testing capacitance in order to change according to the electric capacity of this first electric capacity, electric capacity, this first cross-pressure variation, this second cross-pressure variation and the 3rd cross-pressure of this second electric capacity.
Advantage and spirit about several embodiment of the present invention can be further understood by following detailed description and accompanying drawings.
Description of drawings
Fig. 1 (A)~Fig. 1 (C) illustrates the capacitive detection circuit in the prior art.
Fig. 2 (A)~Fig. 2 (C) is according to the capacitance detecting device in one embodiment of the invention and state variation schematic diagram thereof.
Fig. 3 (A)~Fig. 3 (C) has illustrated the example that capacitance detecting device according to the present invention utilizes external capacitive.
Its state variation schematic diagram of capacitance detecting device during Fig. 4 (A)~Fig. 4 (C) illustrates according to another embodiment of the present invention.
The main element symbol description
100: capacitive detection circuit 12: operational amplifier
14,28: weld pad Cfb: back coupling electric capacity
SW1~SW5: switch Cx: testing capacitance
200: capacitance detecting device 22,42: operational amplifier
24,44: input node 26,46: judge module
29: control module 400: connecting line
500: chip 600: induction panel
48: drive node C1, C2, C1A, C1B: electric capacity
Embodiment
Be capacitance detecting device 200 shown in Fig. 2 (A) according to one embodiment of the invention, wherein comprise two capacitor C 1~C2, five switch SW 1~SW5, operational amplifier 22, input node 24 and judge modules 26.Testing capacitance Cx sees through input node 24 and is connected to capacitance detecting device 200.If capacitance detecting device 200 is arranged in different packaged chips with testing capacitance Cx, input node 24 can be a weld pad, but not as limit.On the practice, capacitance detecting device 200 can independently exist, and also can be integrated in other systems that Detection capacitance amount demand is arranged.
The state of switch SW 1~SW5 can be determined by a control module (not shown).In the phase one of testing process, switch SW 1, SW3, SW4 at first are set to path, and switch SW 2, SW5 are set to and open circuit; Circuit among Fig. 2 (A) is equal to the circuit shown in Fig. 2 (B) (ignoring temporarily judge module 26).Under this set, the voltage of the output terminal of operational amplifier 22 (Vout) and positive-negative input end all can equal reference voltage VL.Capacitor C 2 is discharged to does not have electric charge, and capacitor C 1 is charged to has electric charge C1*VL, and testing capacitance Cx is charged to have electric charge Cx*VL.
Subsequently, in the subordinate phase of testing process, switch SW 1, SW3, SW4 are switched to and open circuit, and switch SW 2, SW5 are switched to path; Circuit among Fig. 2 (A) is equal to the circuit shown in Fig. 2 (C) (ignoring temporarily judge module 26).Under this set, the voltage of the positive-negative input end of operational amplifier 22 was all reference voltage VH, the control nodes X of capacitor C 1 one sides by reconfiguration to controlling voltage VS.
Switching between above-mentioned two stages can cause the cross-pressure of each electric capacity to change, and then causes electric charge to redistribute between capacitor C 1, C2, Cx.Charge balance relation corresponding to input node 24 can be represented as:
(VS+VL-VH)*C1+(Vout-VH)*C2=(VH-VL)*Cx。(3)
Reference voltage VH among this embodiment is higher than VL, and control voltage VS is designed to be higher than (VH-VL).Accordingly, can be found out by formula (3), flow into testing capacitance Cx and flow to input node 24 by self-capacitance C1 from inputting node 24 at the subordinate phase electric current, in other words, certainly inputting positive charge that node 24 flows into testing capacitance Cx has at least a part to be contributed by the positive charge that self-capacitance C1 flows to input node 24.As for self-capacitance C2 impact part in one's power, if Vout greater than VH, electric current is to flow to input node 24 from self-capacitance C2, what namely flow to input node 24 by self-capacitance C2 is positive charge; If Vout is less than VH, electric current flows to self-capacitance C2 from inputting node 24, and what namely flow to input node 24 by self-capacitance C2 is negative charge.The electric charge that is different from testing capacitance Cx among Fig. 1 (C) changes situation about being contributed by back coupling capacitor C fb fully, and in the present embodiment, it is jointly to be contributed by capacitor C 1, C2 that the electric charge of testing capacitance Cx changes.
Formula (3) can further be rewritten as:
Vout = VH + ( VH - VL ) * Cx C 2 - ( VS + VL - VH ) * C 1 C 2 . - - - ( 4 )
Because it is known that the numerical value of voltage VL, VH, VS and capacitor C 1, C2 is all, according to the cross-pressure variation (becoming Vout-VH by zero) at output voltage V out or capacitor C 2 two ends, judge module 26 can be extrapolated the size of testing capacitance Cx.Be the background capacitance Cbg that namely exists before not affected by the user and the summation of capacitance change Csig if testing capacitance Cx further disassembled, formula (4) can be rewritten as:
Vout = VH + ( VH - VL ) * Cbg C 2 + ( VH - VL ) * Csig C 2 - ( VS + VL - VH ) * C 1 C 2 . - - - ( 5 )
Can be found out by formula (5), because reference voltage VH is higher than VL, and control voltage VS is designed to be higher than (VH-VL), and the electric charge of capacitor C 1 contribution can be offset the electric charge of background capacitance Cbg contribution, makes voltage Vout be difficult for the state of reaching capacity.Therefore, even select less capacitor C 2 to improve the resolution of capacitance change Csig, voltage Vout is easy to just because of too high and saturated.Easy speech, as long as select big or small suitable capacitor C 1, capacitance detecting device 200 can provide good measurement resolution, and does not have easily saturated problem of output voltage.
Viewpoint from the electric charge distribution, being characterized as of capacitance detecting device 200 utilizes electric charge that self-capacitance C1 flows to input node 24 as the electric charge of certainly inputting node 24 and flow into background capacitance Cbg, reach electric charge payment effect, make voltage Vout be difficult for the state of reaching capacity.In the situation that reference voltage VH is higher than VL, will control voltage VS to be designed to be higher than electric charge that (VH-VL) can make self-capacitance C1 flow to input node 24 be positive charge (be equal to electric current and flow to input node 24 from self-capacitance C1), certainly input the electric charge that node 24 flows into background capacitance Cbg also is positive charge (be equal to electric current and flow into background capacitance Cbg from inputting node 24).In the situation that reference voltage VH is lower than VL, to control voltage VS to be designed to be lower than electric charge that (VH-VL) can make self-capacitance C1 flow to input node 24 be negative charge (be equal to electric current and flow to self-capacitance C1 from inputting node 24), certainly input the electric charge that node 24 flows into background capacitance Cbg also is negative charge (be equal to electric current and flow into input node 24 from background capacitance Cbg), can reach equally aforementioned electric charge payment effect.In sum, as long as by the suitably cross-pressure variation of these electric capacity of design, so that self-capacitance C1 flows to the electric charge of input node 24 with positive and negative identical from the electric charge of inputting node 24 inflow testing capacitance Cx, can overcome to be difficult in the prior art take into account and measure resolution and avoid the saturated problem of output voltage.
Be the capacitance detecting device shown in Fig. 3 (A) according to another embodiment of the present invention.In this embodiment, capacitor C 1 is arranged on outside the chip 500 at operational amplifier 22 places.In fact, no matter whether capacitor C 1 is comprised in the same chip with operational amplifier 22 elements such as grade, can reach aforementioned effect.It should be noted that the capacitor C 1 among this embodiment utilizes the stray capacitance of connecting line 400 to realize.Take the situation of capacitive touch device as example, testing capacitance Cx normally is formed on the induction panel (block 600 that for example illustrates among the figure), and the line line 400 that sees through on flexible circuit board or the printed circuit board (PCB) links to each other with chip 500.
In this embodiment, the circuit board at connecting line 400 places has shielding (shielding) layer, is present in stray capacitance between connecting line 400 and this screen layer namely as capacitor C 1.The circuit board at connecting line 400 places has an adjustable earth terminal current potential Vact, and shown in Fig. 3 (A), this earth terminal sees through weld pad 28 and is connected to switch SW 4, SW5 in the chip 500.By the keying of gauge tap SW4, SW5, can reach the effect of the cross-pressure that changes capacitor C 1 according to the control module (not shown) in the capacitance detecting device of the present invention.In other words, the cross-pressure on the capacitor C 1 changes and can realize by the earth terminal current potential Vact of this screen layer of control.Should be noted that, as long as suitable characteristics such as the shape of planning connecting line 400, length, thickness, the size of stray capacitance (capacitor C 1) is can accurately be estimated, control.In other words, through design control this connecting line 400 and this screen layer, can adjust flexibly earth terminal current potential Vact and stray capacitance (capacitor C 1), to realize the effect of the cross-pressure variation on the control capacitance C1.In another embodiment, see through initiatively shielding (active shielding) or subtract the means such as consumption (subtraction), also can equivalence find out can be by the capacitor C 1 of the earth terminal current potential Vact change of this screen layer of control.The benefit of this way is to save the occupied space of capacitor C 1 is set in chip 500, effectively utilizes simultaneously the stray capacitance that originally is regarded as verbose or negative factor.
Shown in Fig. 3 (B), in another embodiment, it is two parts that capacitor C 1 also can be disassembled: be arranged at capacitor C 1A and the capacitor C 1B that is arranged in the chip 500 outside the chip 500.Capacitor C 1B can be designed to the main capacitor C 1A Size Error that causes because of process variation in order to compensation, does not therefore need too large.For example, the grade of capacitor C 1B can be at 1~2 micromicrofarad (pF), but not as limit.
Shown in Fig. 3 (C), in another embodiment, capacitor C 1A can be designed as with capacitor C 1B and is subjected to separately different control voltage influences.In this example, when switch SW 5 is path, capacitor C 1B can be connected to the voltage source that control voltage VS is provided, but the change in voltage of capacitor C 1A is controlled the control of module 29.Similarly, as long as so that self-capacitance C1A, C1B flow to the electric charge of input node 24 with positive and negative identical from the electric charge of inputting node 24 inflow testing capacitance Cx, can overcome to be difficult in the prior art take into account and measure resolution and avoid the saturated problem of output voltage.
Aforementioned several embodiment is that to input the situation that the voltage of node 24 can change be example.In fact, the voltage of input node 24 also can be designed to immobilize, for example the embodiment shown in Fig. 4 (A).See also Fig. 4 (A), the state of switch SW 1~SW5 can determine by a control module (not shown), and the two ends of testing capacitance Cx see through respectively input node 44 and are connected node 48 and connect so far capacitance detecting device.
In the phase one of testing process, switch SW 1, SW2, SW4 at first are set to path, and switch SW 3, SW5 are set to and open circuit; Circuit among Fig. 4 (A) is equal to Fig. 4 (B) those shown (ignoring temporarily judge module 46).In this situation, the voltage of the output terminal of operational amplifier 22 (Vout) and positive-negative input end all can equal reference voltage Vref.Capacitor C 2 is discharged to does not have electric charge, and capacitor C 1 is charged to has electric charge C1* (VL-Vref), and testing capacitance Cx is charged to have electric charge Cx* (VH-Vref).
Subsequently, in the subordinate phase of testing process, switch SW 1, SW2, SW4 at first are set to and open circuit, and switch SW 3, SW5 are set to path; Circuit among Fig. 4 (A) is equal to Fig. 4 (C) those shown (ignoring temporarily judge module 46).In this situation, the voltage of the positive-negative input end of operational amplifier 22 still maintains and equals reference voltage Vref, to the power supply unit that control voltage VH is provided, drive 48 of nodes is to be relayed to the power supply unit that control voltage VL is provided to the control node of capacitor C 1 one sides by reconfiguration.
Switching between above-mentioned two stages can cause the cross-pressure of each electric capacity to change, and then causes electric charge to redistribute between capacitor C 1, C2, Cx.Charge balance relation corresponding to input node 44 can be represented as:
(VH-VL)*C1+(Vout-Vref)*C2=(VH-VL)*Cx。(6)
Reference voltage VH among this embodiment is higher than VL.Accordingly, can be found out by formula (6), flow into testing capacitance Cx and flow to input node 44 by self-capacitance C1 from inputting node 44 at the subordinate phase electric current, in other words, certainly inputting positive charge that node 44 flows into testing capacitance Cx has at least a part to be contributed by the positive charge that self-capacitance C1 flows to input node 44.As for self-capacitance C2 impact part in one's power, if Vout greater than Vref, electric current is to flow to input node 44 from self-capacitance C2, what namely flow to input node 44 by self-capacitance C2 is positive charge; If Vout is less than Vref, electric current flows to self-capacitance C2 from inputting node 44, and what namely flow to input node 44 by self-capacitance C2 is negative charge.It is jointly to be contributed by capacitor C 1, C2 that the electric charge of testing capacitance Cx changes.
Formula (6) can further be rewritten as:
Vout = Vref + ( VH - VL ) * Cx C 2 - ( VH - VL ) * C 1 C 2 . - - - ( 7 )
Because it is known that the numerical value of voltage VL, VH, Vref and capacitor C 1, C2 is all, according to the cross-pressure variation (becoming Vout-Vref by zero) at output voltage V out or capacitor C 2 two ends, judge module 46 can be extrapolated the size of testing capacitance Cx.Be the background capacitance Cbg that namely exists before not affected by the user and the summation of capacitance change Csig if testing capacitance Cx further disassembled, formula (7) can be rewritten as again:
Vout = Vref + ( VH - VL ) * Cbg C 2 + ( VH - VL ) * Csig C 2 - ( VH - VL ) * C 1 C 2 . - - - ( 8 )
Can be found out by formula (8), the electric charge of capacitor C 1 contribution can be offset the electric charge of background capacitance Cbg contribution, makes voltage Vout be difficult for the state of reaching capacity.Therefore, even select less capacitor C 2 to improve the resolution of capacitance change Csig, voltage Vout is easy to just because of too high and saturated.Easy speech, as long as select big or small suitable capacitor C 1, this capacitance detecting device can provide good measurement resolution, and does not have easily saturated problem of output voltage.
Capacitance detecting device shown in Fig. 4 (A) can for example hold the formula touch-control system mutually in order to cooperate.More particularly, input node 44 can be connected to the induction electrode in the mutual appearance formula touch-control system, driving node 48 can be connected to the drive electrode in the mutual appearance formula touch-control system, and testing capacitance Cx is exactly the mutual appearance (mutual capacitance) between this induction electrode and this drive electrode; Switch the voltage that offers driving node 48 and be supplies drive signals.In addition, identical with aforementioned several embodiment is, the capacitor C 1 among Fig. 4 (A) also can comprise or be stray capacitance between screen layer and connecting line fully.
In sum, the concept that capacitance detecting device according to the present invention uses is: provide capacitor C the 1 one the first cross-pressures to change, and provide testing capacitance Cx one second cross-pressure to change, make by this capacitor C 2 one the 3rd cross-pressure occur and change, the electric capacity that changes to judge testing capacitance Cx according to electric capacity and these cross-pressures of capacitor C 1, C2 again.As long as and the variation of the second cross-pressure is designed to so that the electric charge of self-capacitance C1 flow direction input node is positive and negative identical with the electric charge of certainly inputting node inflow testing capacitance Cx with the variation of the first cross-pressure, just can overcome to be difficult to take into account the measurement resolution in the prior art and to avoid the saturated problem of output voltage.
Be a capacitance touch control system according to another embodiment of the present invention, wherein comprise a display, a plurality of inductance capacitance and one or more capacitance detecting device shown in Fig. 2 (A), Fig. 3 (A), Fig. 3 (B), Fig. 3 (C) or Fig. 4 (A).Corresponding to the provider location on this display, its size variation can be subjected to the detection of these one or more capacitance detecting devices to these a plurality of inductance capacitances separately.Function mode about capacitance detecting device can with reference to the related description of previous embodiment, repeat no more.
As mentioned above, the above specific embodiment of the present invention proposes a kind of new capacitance detecting device and uses the capacitance touch control system of this capacitance detecting device.By suitably supplying the quantity of electric charge that testing capacitance needs feedbacking outer newly-increased electric capacity of electric capacity in the electric charge re-allocation process, the capacitance detecting device of above specific embodiment can overcome and is difficult to take into account the measurement resolution in the prior art and avoids the saturated problem of output voltage according to the present invention.Except the matching with capacitive touch-control system, the capacitance detecting device of above specific embodiment also can be widely used in the occasion that other various needs are measured capacitance according to the present invention.
By the detailed description of above specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with the above-mentioned preferred embodiment that is disclosed.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention wish application.

Claims (14)

1. a capacitance detecting device is connected in a testing capacitance, and this capacitance detecting device comprises:
One first electric capacity and one second electric capacity see through an input node and are connected to this testing capacitance;
One control module, in order to provide this first electric capacity one first cross-pressure to change, and provide this testing capacitance one second cross-pressure to change, make by this this second electric capacity produce one the 3rd cross-pressure and change, wherein this first cross-pressure variation makes the electric charge that flows to the electric charge of this input node and flow into this testing capacitance from this input node from this first electric capacity positive and negative identical with this second cross-pressure variation; And
One judge module in order to change according to the electric capacity of this first electric capacity, electric capacity, this first cross-pressure variation, this second cross-pressure variation and the 3rd cross-pressure of this second electric capacity, is judged the electric capacity of this testing capacitance.
2. capacitance detecting device as claimed in claim 1, it is characterized in that, this capacitance detecting device and this testing capacitance see through a connecting line that is formed on the circuit board and join, this circuit board has a screen layer, wherein this first electric capacity comprises the stray capacitance between this connecting line and this screen layer, and this control module is controlled this screen layer to provide this first cross-pressure of this first electric capacity to change.
3. capacitance detecting device as claimed in claim 2 is characterized in that, this circuit board is a flexible circuit board or a printed circuit board (PCB).
4. capacitance detecting device as claimed in claim 1 is characterized in that, this first electric capacity is connected between this input node and a control node, and this second electric capacity is connected between this input node and an output node; This control module is controlled voltage in a very first time for inputting node and this output node one first input voltage and supplying control node one first; This control module is controlled voltage in one second time for inputting node one second input voltage and supplying control node one second; The difference of this first input voltage and this second input voltage is less than the difference of this first control voltage and this second control voltage.
5. capacitance detecting device as claimed in claim 4 is characterized in that, this control module comprises:
One operational amplifier has a first input end, the second input end and an output terminal, and this first input end is this input node, and this output terminal is this output node;
One first switch is connected between first input end and this output terminal, is path in this very first time, in this second time for opening circuit;
One second switch is connected between this second input end and one second input voltage supply, in this very first time for opening circuit, be path in this second time;
One the 3rd switch is connected between this second input end and one first input voltage supply, is path in this very first time, in this second time for opening circuit;
One the 4th switch is connected between this control node and an earth terminal, is path in this very first time, in this second time for opening circuit; And
One the 5th switch, be connected in this control node and one first control Voltage Supply Device between, in this very first time for opening circuit, be path in this second time.
6. capacitance detecting device as claimed in claim 1, it is characterized in that, this testing capacitance is connected in this input node and and drives between node, and this first electric capacity is connected between this input node and a control node, and this second electric capacity is connected between this input node and an output node; This control module should be inputted node and this output node one reference voltage, supplies control node one first voltage, supply drive node one second voltage in very first time confession; This control module should be inputted this reference voltage of node, supplies control this second voltage of node, supply drive this first voltage of node in the confession of one second time; This first voltage is different from this second voltage.
7. capacitance detecting device as claimed in claim 6 is characterized in that, this control module comprises:
One operational amplifier has a first input end, the second input end and an output terminal, and this first input end is this input node, and this output terminal is this output node, and this second input end is connected to a reference voltage supplies device;
One first switch is connected between first input end and this output terminal, is path in this very first time, in this second time for opening circuit;
One second switch is connected between this driving node and a second voltage supply, is path in this very first time, in this second time for opening circuit;
One the 3rd switch is connected between this driving node and one first Voltage Supply Device, in this very first time for opening circuit, be path in this second time;
One the 4th switch is connected between this control node and this first Voltage Supply Device, is path in this very first time, in this second time for opening circuit; And
One the 5th switch is connected between this control node and this second voltage supply, in this very first time for opening circuit, be path in this second time.
8. capacitance touch control system comprises:
One display;
A plurality of inductance capacitances are separately corresponding to the provider location on this display;
One first electric capacity and one second electric capacity, see through an input node be connected to these a plurality of inductance capacitances one of them as a testing capacitance;
One control module, in order to provide this first electric capacity one first cross-pressure to change, and provide this testing capacitance one second cross-pressure to change, make by this this second electric capacity produce one the 3rd cross-pressure and change, wherein this first cross-pressure variation makes the electric charge that flows to the electric charge of this input node and flow into this testing capacitance from this input node from this first electric capacity positive and negative identical with this second cross-pressure variation; And
One judge module in order to change according to the electric capacity of this first electric capacity, electric capacity, this first cross-pressure variation, this second cross-pressure variation and the 3rd cross-pressure of this second electric capacity, is judged the electric capacity of this testing capacitance.
9. capacitance touch control system as claimed in claim 8, it is characterized in that, this capacitance detecting device and this testing capacitance see through a connecting line that is formed on the circuit board and join, this circuit board has a screen layer, wherein this first electric capacity comprises the stray capacitance between this connecting line and this screen layer, and this control module is controlled this screen layer to provide this first cross-pressure of this first electric capacity to change.
10. capacitance touch control system as claimed in claim 9 is characterized in that, this circuit board is a flexible circuit board or a printed circuit board (PCB).
11. capacitance touch control system as claimed in claim 8 is characterized in that, this first electric capacity is connected between this input node and a control node, and this second electric capacity is connected between this input node and an output node; This control module is controlled voltage in a very first time for inputting node and this output node one first input voltage and supplying control node one first; This control module is controlled voltage in one second time for inputting node one second input voltage and supplying control node one second; The difference of this first input voltage and this second input voltage is less than the difference of this first control voltage and this second control voltage.
12. capacitance touch control system as claimed in claim 11 is characterized in that, this control module comprises:
One operational amplifier has a first input end, the second input end and an output terminal, and this first input end is this input node, and this output terminal is this output node;
One first switch is connected between first input end and this output terminal, is path in this very first time, in this second time for opening circuit;
One second switch is connected between this second input end and one second input voltage supply, in this very first time for opening circuit, be path in this second time;
One the 3rd switch is connected between this second input end and one first input voltage supply, is path in this very first time, in this second time for opening circuit;
One the 4th switch is connected between this control node and an earth terminal, is path in this very first time, in this second time for opening circuit; And
One the 5th switch, be connected in this control node and one first control Voltage Supply Device between, in this very first time for opening circuit, be path in this second time.
13. capacitance touch control system as claimed in claim 8, it is characterized in that, this testing capacitance is connected in this input node and and drives between node, and this first electric capacity is connected between this input node and a control node, and this second electric capacity is connected between this input node and an output node; This control module should be inputted node and this output node one reference voltage, supplies control node one first voltage, supply drive node one second voltage in very first time confession; This control module should be inputted this reference voltage of node, supplies control this second voltage of node, supply drive this first voltage of node in the confession of one second time; This first voltage is different from this second voltage.
14. capacitance touch control system as claimed in claim 13 is characterized in that, this control module comprises:
One operational amplifier has a first input end, the second input end and an output terminal, and this first input end is this input node, and this output terminal is this output node, and this second input end is connected to a reference voltage supplies device;
One first switch is connected between first input end and this output terminal, is path in this very first time, in this second time for opening circuit;
One second switch is connected between this driving node and a second voltage supply, is path in this very first time, in this second time for opening circuit;
One the 3rd switch is connected between this driving node and one first Voltage Supply Device, is path in this very first time, is short circuit in this second time;
One the 4th switch is connected between this control node and this first Voltage Supply Device, is path in this very first time, in this second time for opening circuit; And
One the 5th switch is connected between this control node and this second voltage supply, in this very first time for opening circuit, be path in this second time.
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