CN106598370A - Touch detection circuit and touch device thereof - Google Patents
Touch detection circuit and touch device thereof Download PDFInfo
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- CN106598370A CN106598370A CN201710039786.1A CN201710039786A CN106598370A CN 106598370 A CN106598370 A CN 106598370A CN 201710039786 A CN201710039786 A CN 201710039786A CN 106598370 A CN106598370 A CN 106598370A
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 230000005611 electricity Effects 0.000 claims description 17
- 230000005669 field effect Effects 0.000 claims description 11
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 239000003990 capacitor Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 description 15
- 239000013078 crystal Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
Abstract
The invention discloses a touch detection circuit and a touch device thereof. The touch detection circuit comprises a basic capacitor, a voltage source, an operational amplifier, a first current source and a second current source, wherein the voltage source is used for charging the basic capacitor; the operational amplifier is used for outputting a detection signal according to the variable quantity of the basic capacitor; a first end of the first current source receives power supply voltage; a second end of the first current source is connected to an inverting input terminal of the operational amplifier through a fourth switch; a first end of the second current source is connected to an inverting input terminal of the operational amplifier; and a second end of the second current source is connected to the ground through a fifth switch. According to the touch detection circuit and the touch device thereof, the sensitivity of the touch detection circuit can be improved while the minimization of a chip can be realized.
Description
Technical field
The present invention relates to touch-control field, more particularly, to a kind of touch detection circuit and its contactor control device.
Background technology
Existing capacitive touch device detection method, has and detects two kinds of basic schemes based on self-capacitance detection and mutual capacitance,
Two kinds of basic schemes are all have conductor (such as the finger of people) to become near the small capacitance caused by capacitive touch device by detection
Change to realize recognizing operation.And generally, the capacitance change by caused by conductor approaching device is much smaller than device institute
The size of the measured capacitance having is stated, electric capacity and screen parasitic capacitance that these measured capacitances have including screen itself.
Due to the presence of measured capacitance, the valid analysing range of detection circuit is limited, so as to limit to small capacitance change-detection
The raising of sensitivity.
To solve this technical problem, frequently with the increase compensating electric capacity in original touch detection circuit in prior art
Method, by the charging of control and compensation electric capacity, discharge process, reduces a predetermined electricity so that tested by the electricity of measured capacitance
Capacitance change on electric capacity increases relative to capacitance change during uncompensated electric capacity, and then improves the sensitive of detection circuit
Degree.But compensating electric capacity chip occupying area is larger in prior art, it is unfavorable for the miniaturization of chip, and increased the manufacture of chip
Cost.Thus, on the basis of the sensitivity for realizing improving detection circuit, realize the miniaturization of chip just into the skill of this area
Art personnel need the problem for solving.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of touch detection circuit and its touch control device, and it can improved
The miniaturization of chip is realized on the basis of touch detection circuit detection sensitivity.
In order to solve above-mentioned technical problem, according to the first aspect of the invention, there is provided a kind of touch detection circuit, including：
Basic electric capacity, the first end of the basic electric capacity is connected to second switch, the second end ground connection of the basic electric capacity；Voltage source,
The voltage source is connected to the first end of the basic electric capacity via first switch, for charging for the basic electric capacity；Computing
Amplifier, the inverting input of the operational amplifier is connected to the first end of the basic electric capacity via second switch, described
The in-phase input end of operational amplifier receives common-mode voltage, and the operational amplifier is used for the variable quantity according to the basic electric capacity
Output detection signal；3rd switch, inverting input and the computing of the 3rd switch in parallel in the operational amplifier
Between the outfan of amplifier；First electric capacity, first electric capacity is connected with the 3rd switch in parallel；And first current source
With the second current source, the first end of first current source receives supply voltage, and the second end of first current source is via the
Four switches are connected to the inverting input of the operational amplifier, and the first end of second current source is connected to the computing and puts
The inverting input of big device, the second end of second current source is grounded via the 5th switch.
Preferably, first current source and the second current source are constant current source.
Preferably, first current source includes a first transistor and a transistor seconds, the first crystal
Pipe and the transistor seconds are controlled by the first control signal and the second control signal, and the source electrode of the first transistor connects
Supply voltage is received, the drain electrode of the first transistor is connected with the source electrode of the transistor seconds, the leakage of the transistor seconds
Pole is connected to the inverting input of the operational amplifier via the described 4th switch；Second current source includes one the 3rd
Transistor and the 4th transistor, the third transistor and the 4th transistor be controlled by the 3rd control signal and
4th control signal, the source electrode of the third transistor is connected to the inverting input of the operational amplifier, and described is trimorphism
The drain electrode of body pipe is connected with the source electrode of the 4th transistor, and the drain electrode of the 4th transistor connects via the described 5th switch
Ground.
Preferably, the touch detection circuit also includes control module, and the control module is opened for controlling the described 4th
Close and the described 5th closed and disconnected for switching.
Preferably, the control module includes clock module and counting module, and the clock module is used to export clock letter
Number, the frequency of the clock signal is, for example, 10MHZ to 50MHZ, and the counting module is used to be exported according to the clock signal
Control signal.
Preferably, first current source includes N number of the first transistor and N transistor secondses, the second current source bag
M third transistor and M the 4th transistor are included, the touch detection circuit also includes the N number of 6th switch, M the 7th switch
And control module, wherein M and N is the integer more than 1, and the drain electrode of each transistor seconds is respectively via corresponding one
Six switches and the described 4th switch are connected to the inverting input of the operational amplifier, the drain electrode of each the 4th transistor
Respectively via corresponding one the 7th switch and the inverting input of the described 5th switch connection operational amplifier, the control
Molding block is used to control the closed and disconnected of N number of 6th switch and M the 7th switch.
Preferably, the M is equal to N.
Preferably, the first transistor and transistor seconds are p-type field effect transistor, the third transistor and the 4th
Transistor is N-type field effect transistor.
Preferably, the current source includes positive current source or negative current source.
According to the second aspect of the invention, there is provided a kind of contactor control device, the contactor control device includes institute any one of above
The touch detection circuit stated.
Touch detection circuit road according to embodiments of the present invention, by impressed current source the electricity of basic electric capacity is reduced, and is carried
The high detection sensitivity of touch detection circuit, and the area of chip is reduced, realize the control to current source output accuracy.
Description of the drawings
By referring to the drawings to the description of inventive embodiments, the above-mentioned and other purposes of the present invention, feature and excellent
Point will be apparent from, in the accompanying drawings：
Fig. 1 illustrates the structure chart of the touch detection circuit according to prior art.
Fig. 2 illustrates the structure chart of touch detection circuit according to a first embodiment of the present invention.
First current source and in the touch detection circuit that Fig. 3 a and Fig. 3 b are shown respectively according to a second embodiment of the present invention
The structure chart of one current source.
First current source and in the touch detection circuit that Fig. 4 a and Fig. 4 b are shown respectively according to a third embodiment of the present invention
The structure chart of one current source.
First current source and in the touch detection circuit that Fig. 5 a and Fig. 5 b are shown respectively according to a fourth embodiment of the present invention
The structure chart of two current sources.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
It is detailed to describe some specific detail sections during text is to the detailed description of the embodiment of the present invention, those skilled in the art are come
Saying the description of part without these details can also completely understand the present invention.It is known in order to avoid obscuring the essence of the present invention
Method, process, flow process are without narration in detail.
In various figures, identical element is represented using similar reference.For the sake of clarity, in accompanying drawing
Various pieces are not necessarily to scale.Additionally, may not shown some known parts in figure.Flow chart, frame in accompanying drawing
Figure illustrates system, method, the possible System Framework of device, function and the operation of embodiments of the invention, the square frame of accompanying drawing
And square frame order is used only to preferably illustrate the process and step of embodiment, and should not be in this, as the limit to invention itself
System.
Fig. 1 illustrates the structure chart of touch detection circuit in prior art.As shown in figure 1, detection circuit includes：Basic electric capacity
Cb, the first electric capacity Cf, compensating electric capacity Cc, operational amplifier A MP, first switch S1, second switch S2, the 3rd switch S3, the 4th
The switch S5 of switch S4 and the 5th, wherein, the basic electric capacity Cb corresponds to the direct-to-ground capacitance of each pixel.
The first end of the basic electric capacity Cb is connected to the first end of first switch S1 and the first of second switch S2 simultaneously
End, the second end ground connection of the basic electric capacity Cb；Second end of first switch S1 is connected to voltage source；The second switch
Second end of S2 is connected to the inverting input of operational amplifier A MP；The 3rd switch S3 is connected to the computing and puts
Between the outfan and inverting input of big device AMP；The first electric capacity Cf is connected in parallel with the described 3rd switch S3；The fortune
The in-phase input end for calculating amplifier AMP receives common-mode voltage VCM, and the outfan of operational amplifier A MP is used to export detection
Signal VO；The first end of compensating electric capacity Cc is connected to the operational amplifier A MP inverting input, compensating electric capacity Cc
The second end respectively with the 4th switch S4 first end and the 5th switch S5 first end be connected, it is described 4th switch S4 second
Second end of end and the 5th switch S5 is respectively connecting to the first compensating voltage source and the second compensating voltage source.
In the structure chart of touch detection circuit shown in Fig. 1, due to touch the basic electric capacity Cb variable quantities that cause be equivalent to
The touch electric capacity △ C that the basic electric capacity Cb is connected in parallel.Wherein, the voltage source, the first compensating voltage source and second are mended
Repay any one that voltage source includes in the positive voltage source VDD and negative voltage source VSS.
In first period φ 1, first switch S1, the 3rd switch S3 and the 4th switch S4 are closed, second switch S2
And the 5th switch S5 disconnect.The basic electric capacity Cb is started to charge up via first switch S1, compensating electric capacity Cc via
4th switch S4 is started to charge up, and the voltage source is, for example, positive voltage source VDD, and accordingly, first compensating voltage source is for example
For negative voltage source VSS, after charging complete, the basic electric capacity Cb both end voltages correspond to VCC, the compensating electric capacity Cc two ends electricity
Pressure corresponds to VSS.Now operational amplifier A MP is connected into a unity gain buffer, by the phase of unity gain buffer
Close characteristic to understand, the output end voltage of operational amplifier A MP is equal to homophase input terminal voltage, corresponds to common-mode voltage
VCM。
In second phase φ 2, first switch S1, the 3rd switch S3 and the 4th switch S4 are turned off, second switch S2
With the 5th switch S5 closures so that operational amplifier A MP is operated in linear zone, now the homophase of operational amplifier A MP
Input and inverting input are considered as isoelectric level, and this characteristic is referred to as false short circuit, referred to as empty short.Due to operational amplifier
This characteristic of AMP, now, the in-phase input end and anti-phase input terminal voltage of operational amplifier A MP correspond to common mode
Voltage VCM.
If switching S4, the 5th switch S5 and compensating electric capacity Cc without the 4th in touch detection circuit, in this stage, basis electricity
Hold the transfer that electric charge occurs between Cb and the first electric capacity Cf, until causing the in-phase input end of operational amplifier A MP and anti-
Phase input isoelectric level.In the process, operational amplifier A MP is caused to export the change of detection signal VO, if first period φ 1
Interior detection signal VO corresponds to VOφ1, detection signal VO corresponds to VO in second phase φ 2φ2, then detection signal VO variable quantities △
VO is corresponded to：
According to law of conservation of charge, can obtain：
The outfan of operational amplifier A MP is connected to analog to digital conversion circuit (not shown), analog-digital conversion circuit as described
For being obtained touching electric capacity △ C according to detection signal VO variable quantities.
Due to basic electric capacity Cb capacitances too big (maximum up to pF up to a hundred), and touching for acquisition is only wanted in practical application
Electric capacity △ C capacitances (generally only 1pF or so) are touched, this will result in, and detection signal VO variable quantity △ VO are too little, and reduction is detected
Sensitivity.
Detection circuit of the prior art is due to increased the 4th switch S4, the 5th switch S5 and compensating electric capacity Cc, institute
It is, for example, VDD to state the second compensating voltage source, and the 5th switch S5 is closed so that the compensating electric capacity Cc both end voltage corresponds to VDD-
VSS, the transfer that electric charge occurs between the basic electric capacity Cb and compensating electric capacity Cc, the electricity of basic electric capacity Cb is reduced so that base
The capacitance change (touching electric capacity △ C) of plinth electric capacity Cb increases relative to during uncompensated electric capacity Cc, and then improves detection circuit
Sensitivity.
Fig. 2 illustrates the structure chart of touch detection circuit according to a first embodiment of the present invention.As shown in Fig. 2 detection circuit
Including：Basic electric capacity Cb, the first electric capacity Cf, operational amplifier A MP and first switch S1, second switch S2, the 3rd switch S3,
4th switch S4, the 5th switch S5, the first current source Ic1 and the second current source Ic2, wherein, the basic electric capacity Cb correspondences
For the direct-to-ground capacitance of each pixel.
The first end of the basic electric capacity Cb is connected to the first end of first switch S1 and the first of second switch S2 simultaneously
End, the second end ground connection of the basic electric capacity Cb；Second end of first switch S1 is connected to voltage source, the voltage source bag
Include any one in positive voltage source VDD and negative voltage source VSS；Second end of the second switch S2 is connected to the computing
The inverting input of amplifier AMP；The 3rd switch S3 is connected to the outfan and anti-phase input of operational amplifier A MP
Between end；The first electric capacity Cf is connected in parallel with the described 3rd switch S3；The homophase input termination of operational amplifier A MP
Common-mode voltage VCM is received, the outfan of operational amplifier A MP is used to export detection signal VO；The first current source Ic1 and
First current source Ic2 is constant current source, and the first end of the first current source Ic1 receives supply voltage VCC, and described first
Second end of current source Ic1 is connected to the operational amplifier A MP inverting input via the 4th switch S4；Second electric current
The first end of source Ic2 is connected to the operational amplifier A MP inverting input, second end of the second current source Ic2 via
5th switch S5 ground connection.
In the structure chart of touch detection circuit shown in Fig. 2, due to touch the basic electric capacity Cb variable quantities that cause be equivalent to
The touch electric capacity △ C that the basic electric capacity Cb is connected in parallel.
If the voltage source is negative voltage source VDD：
In first period φ 1, first switch S1, the 3rd switch S3 close, second switch S2, the 4th switch S4 and
5th switch S5 disconnects, and the basic electric capacity Cb is started to charge up via first switch S1, after charging complete, the basic electric capacity
Cb both end voltages correspond to VDD.
In second phase φ 2, first switch S1, the 3rd switch S3 and the 4th switch S4 disconnect, second switch S2
And the 5th switch S5 close, in the basic electric capacity Cb accumulate positive charge via the " current sources of second switch S2- second
Ic2- the 5th switchs S5 " it is released, the electricity of basic electric capacity Cb is reduced, from formula (1.2), the electricity of basic electric capacity Cb
Reduce, touch ratio increase shared by electric capacity △ C, the sensitivity for detecting circuit is improved.
If the voltage source is negative voltage source VSS：
In first period φ 1, first switch S1, the 3rd switch S3 close, second switch S2, the 4th switch S4 and
5th switch S5 disconnects, and the basic electric capacity Cb is started to charge up via first switch S1, after charging complete, the basic electric capacity
Cb both end voltages correspond to VSS.
In second phase φ 2, first switch S1, the 3rd switch S3 and the 5th switch S5 disconnect, second switch S2
And the 4th switch S4 close, in the basic electric capacity Cb accumulate negative charge via " second switch S2- the 4th switch S4-
First current source Ic1 " is released, and the electricity of basic electric capacity Cb is reduced, from formula (1.2), the electricity of basic electric capacity Cb
Reduce, make ratio increase shared by touch electric capacity △ C, the sensitivity for detecting circuit is improved.
First embodiment of the invention provide touch detection circuit in terms of existing technologies, due to using constant current supply
Instead of compensating electric capacity Cc so that chip area is greatly reduced, it is real on the basis of raising touch detection circuit sensitivity is realized
Show the miniaturization of chip, save manufacturing cost.
Fig. 3 a and Fig. 3 b are shown respectively the first current source and the in the touch detection circuit of second embodiment of the invention offer
The structure chart of one current source.The first current source Ic1 and the second current source Ic2 for example can be used for the touch detection shown in Fig. 2
In circuit.
As shown in Figure 3 a and Figure 3 b shows, the first current source Ic1 includes being controlled by the first control signal Vpb1 and the
One the first transistor M1 and a transistor seconds M2 of two control signals Vpb2, the first transistor M1 and the second crystal
Pipe M2 is p-type field effect transistor, and the source electrode of the first transistor M1 is connected to supply voltage VCC, the first transistor M1
Drain electrode be connected with the source electrode of the transistor seconds M2, the drain electrode of the transistor seconds M2 is connected to via the 4th switch S4
The inverting input of operational amplifier A MP；The second current source Ic2 includes being controlled by the 3rd control signal Vnb1
With third transistor M3 and a 4th transistor M4 of the 4th control signal Vnb2, third transistor M3 and the 4th
Transistor M4 is N-type field effect transistor, and the source electrode of third transistor M3 is connected to the anti-phase input of operational amplifier A MP
End, the drain electrode of third transistor M3 is connected with the source electrode of the 4th transistor M4, and the drain electrode of the 4th transistor M4 is via the
Five switch S5 ground connection.
The touch detection circuit that second embodiment of the invention is provided is examined relative to the touch that first embodiment of the invention is provided
For slowdown monitoring circuit, because the first current source and the second current source are realized by field effect transistor so that chip area further reduces,
The miniaturization of chip is realized on the basis of raising touch detection circuit sensitivity is realized, manufacturing cost is saved.
Fig. 4 a and Fig. 4 b are shown respectively the first current source and the in the touch detection circuit of third embodiment of the invention offer
The structure chart of two current sources.The first current source Ic1 and the first current source Ic2 for example can be used for the touch detection shown in Fig. 2
In circuit.
As shown in figures 4 a and 4b, third embodiment of the invention provide touch detection circuit include the first current source Ic1,
First current source Ic2 and control module, the first current source Ic1 includes being controlled by the first control signal Vpb1 and the
One the first transistor M1 and a transistor seconds M2 of two control signals Vpb2, the first transistor M1 and the second crystal
Pipe M2 is p-type field effect transistor, and the source electrode of the first transistor M1 receives supply voltage VCC, the first transistor M1's
Drain electrode is connected with the source electrode of the transistor seconds M2, and the drain electrode of the transistor seconds M2 is connected to institute via the 4th switch S4
State the inverting input of operational amplifier A MP；The second current source Ic2 include be controlled by the 3rd control signal Vnb1 and
One third transistor M3 and a 4th transistor M4 of the 4th control signal Vnb2, third transistor M3 and the 4th brilliant
Body pipe M4 is N-type field effect transistor, and the source electrode of third transistor M3 is connected to the anti-phase input of operational amplifier A MP
End, the drain electrode of third transistor M3 is connected with the source electrode of the 4th transistor M4, and the drain electrode of the 4th transistor M4 is via institute
State the 5th switch S5 ground connection.
The control module is used to control the closed and disconnected of the 4th switch S4 and the 5th switch S5, and here is only
The control process of the described 4th switch S4 is illustrated with the control module, the control module includes clock module and meter
Digital-to-analogue block, the clock module is used to export clock signal, and the frequency of the clock signal is, for example, 10MHZ～50MHZ, described
Clock signal period number is n, and n is the integer more than or equal to 1, and the counting module is believed according to the clock signal output control
Number.When the clock signal is persistently exported, the counting module exports the control signal of high level, and the control signal is high electricity
At ordinary times, the 4th switch S4 closures, when the clock signal stops output, the counting module exports low level control letter
Number, when the control signal is low level, the 4th switch S4 disconnects, it can thus be appreciated that clock module output clock signal
Periodicity determine the closing time of the 4th switch S4 and the 5th switch S5, and control the reduction electricity of basic electric capacity Cb accordingly
Amount, it is to be understood that the closing time and the first current source Ic1 of the 4th switch S4 and the 5th switch S5
The compensation range to basic electric capacity Cb has been together decided on the output current intensity of the second current source Ic2, and the described 4th
The adjustable accuracy and the first current source Ic1 and second current source of switch S4 and the 5th switch S5 closing times
The adjustable accuracy of the output current intensity of Ic2 determines the compensation precision to basic electric capacity Cb.
Because the capacitance of each pixel of contactor control device basis electric capacity is not quite similar, need thus for each pixel
The electricity to be compensated also is differed, and the touch detection circuit that third embodiment of the invention is provided is real relative to the present invention second
Control module is increased for the touch detection circuit that example offer is provided, the clock signal exported using clock module is realized to electric current
The control of source compensation range and compensation precision, the output area and precision for realizing current source is adjustable, thus to each pixel
Point realizes preferable compensation effect.
Fig. 5 a and Fig. 5 b are shown respectively the present invention the 4th and apply the first current source and second in the touch detection circuit that example is provided
The structure chart of current source.The first current source Ic1 and the first current source Ic2 for example can be used for the touch detection electricity shown in Fig. 2
Lu Zhong.
As shown in figure 5 a and 5b, the first current source Ic1 corresponds to the digital to analog converter of n-bit, and it includes difference
Be controlled by the first control signal Vpb1 and the second control signal Vpb2 N number of the first transistor M1, N number of transistor seconds M2 and
N number of 6th switch S6, the first transistor M1 and the first transistor M2 are p-type field effect transistor, the first transistor M1
Source electrode be connected to supply voltage VCC, the drain electrode of the first transistor M1 is connected with the source electrode of the transistor seconds M2, institute
The drain electrode for stating transistor seconds M2 is connected to the computing and puts via corresponding one the 6th switch S6 and the 4th switch S4 respectively
The inverting input of big device AMP；The second current source Ic2 corresponds to the digital to analog converter of n-bit, and it includes being controlled by
M third transistor M3, M of the 3rd control signal Vnb1 and the 4th control signal Vnb2 the 4th transistor M4 and M the
Seven switch S7, third transistor M3 and the 4th transistor M4 are N-type field effect transistor, the source electrode of third transistor M3
It is connected to the inverting input of operational amplifier A MP, the drain electrode of third transistor M3 and the source of the 4th transistor M4
Pole is connected, and the drain electrode of the 4th transistor M4 is respectively via corresponding one the 7th switch S7 and the 5th switch S5 ground connection.It is described
Control module is used to control the closed and disconnected of N number of 6th switch and M the 7th switch.Preferably, the M is equal to N.
Here only to correspond to the first current source Ic1 of digital to analog converter of 2-bit as a example by illustrate, if with " 1 " and
" 0 " represent respectively it is corresponding two the 6th switch S6 closed and disconnecteds, then the digital to analog converter for 2-bit have 4 kinds it is defeated
Exit pattern, respectively " 00 ", " 01 ", " 10 ", " 11 ", that is, the first current source Ic1 for corresponding to the digital to analog converter of 2-bit altogether may be used
The output current of four kinds of varying strengths is provided, it is similar, it is known that to correspond to the first current source Ic1 of the digital to analog converter of n-bit,
It can provide 2nThe output current of varying strength is planted, wherein, n is the integer more than 1.
Because the capacitance of each pixel of contactor control device basis electric capacity is not quite similar, need thus for each pixel
The electricity to be compensated also is differed, and the touch detection circuit that fourth embodiment of the invention is provided is real relative to the present invention second
Increased control module for the touch detection circuit that example offer is provided, and using n-bit digital to analog converter as current source, it is real
The output area and precision for having showed current source is adjustable, thus realizes preferable compensation effect to each pixel.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that a series of process, method, article or equipment including key elements not only will including those
Element, but also including other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
According to embodiments of the invention as described above, these embodiments do not have all of details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used well using modification of the invention and on the basis of the present invention.The present invention only receives right
The restriction of claim and its four corner and equivalent.
Claims (10)
1. a kind of touch detection circuit, it is characterised in that include：
Basic electric capacity, the first end of the basic electric capacity is connected to second switch, the second end ground connection of the basic electric capacity；
Voltage source, the voltage source is connected to the first end of the basic electric capacity via first switch, for for it is described basis electricity
Capacity charge；
Operational amplifier, the inverting input of the operational amplifier is connected to the first of the basic electric capacity via second switch
End, the in-phase input end of the operational amplifier receives common-mode voltage, and the operational amplifier is used for according to the basic electric capacity
Variable quantity output detection signal；
3rd switch, the 3rd switch in parallel the operational amplifier inverting input and the operational amplifier it is defeated
Go out between end；
First electric capacity, first electric capacity is connected with the 3rd switch in parallel；And
First current source and the second current source, the first end of first current source receives supply voltage, first current source
The second end be connected to the inverting input of the operational amplifier via the 4th switch, the first end of second current source connects
The inverting input of the operational amplifier is connected to, the second end of second current source is grounded via the 5th switch.
2. touch detection circuit according to claim 1, it is characterised in that first current source and the second current source are equal
For constant current source.
3. touch detection circuit according to claim 2, it is characterised in that first current source include one it is first brilliant
Body pipe and a transistor seconds, the first transistor and the transistor seconds are controlled by the first control signal and
Two control signals, the source electrode of the first transistor receives supply voltage, and the drain electrode of the first transistor is brilliant with described second
The source electrode of body pipe is connected, and the drain electrode of the transistor seconds is connected to the anti-phase of the operational amplifier via the described 4th switch
Input；Second current source includes a third transistor and the 4th transistor, the third transistor and described
4th transistor is controlled by the 3rd control signal and the 4th control signal, and the source electrode of the third transistor is connected to described
The inverting input of operational amplifier, the drain electrode of the third transistor is connected with the source electrode of the 4th transistor, described
The drain electrode of the 4th transistor is grounded via the described 5th switch.
4. touch detection circuit according to claim 3, it is characterised in that the touch detection circuit also includes control mould
Block, the control module is used to control the closed and disconnected of the 4th switch and the described 5th switch.
5. touch detection circuit according to claim 4, it is characterised in that the control module includes clock module and meter
Digital-to-analogue block, the clock module is used to export clock signal, and the frequency of the clock signal is, for example, 10MHZ to 50MHZ, described
Counting module is used for according to the clock signal output control signal.
6. touch detection circuit according to claim 2, it is characterised in that first current source includes that N number of first is brilliant
Body pipe and N transistor secondses, second current source includes M third transistor and M the 4th transistor, the touch detection
Circuit also includes the N number of 6th switch, the switches of M the 7th and control module, and wherein M and N is the integer more than 1, and each described the
The drain electrode of two-transistor is connected to the operational amplifier via corresponding one the 6th switch and the described 4th switch respectively
Inverting input, the drain electrode of each the 4th transistor connects respectively via corresponding one the 7th switch and the described 5th switch
The inverting input of the operational amplifier is connect, the control module is used to control closing for N number of 6th switch the 7th switch individual with M
Close and disconnect.
7. touch detection circuit according to claim 6, it is characterised in that the M is equal to N.
8. touch detection circuit according to claim 3, it is characterised in that the first transistor and transistor seconds are equal
For p-type field effect transistor, the third transistor and the 4th transistor are N-type field effect transistor.
9. touch detection circuit according to claim 1, it is characterised in that the current source includes positive current source or negative electricity
Stream source.
10. a kind of contactor control device, it is characterised in that including the touch detection circuit any one of claim 1 to 9.
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