CN102541367B - A kind of capacitance-type touch control detection circuit, pick-up unit - Google Patents
A kind of capacitance-type touch control detection circuit, pick-up unit Download PDFInfo
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Abstract
The invention discloses a kind of capacitance-type touch control detection circuit, for detecting the variable quantity of measured capacitance, comprising: constant pressure source, for charging to measured capacitance; First switch, for controlling the duration of charging of measured capacitance, constant pressure source, the first switch, measured capacitance are connected; First control circuit, for controlling the described conducting of the first switch and the time of disconnection; Compensating module, for reducing a predetermined electricity by the electricity of measured capacitance; Amplification module, for reducing the measured capacitance voltage amplification of electricity; Corresponding pick-up unit and detection method are also provided.After the electricity of measured capacitance is reduced a predetermined electricity by compensating module by the present invention, amplified by amplification module again, because the electricity of measured capacitance reduces, and then the voltage on it reduces, making the capacitance change in measured capacitance relative to capacitance change when not having a compensating module increases, and then testing circuit improves sensitivity.
Description
Technical field
The present invention relates to a kind of touch control detection technical field, particularly relate to a kind of capacitance-type touch control detection circuit, pick-up unit and detection method thereof.
Background technology
Existing capacitive touch device detection method, have and detect two kinds of basic schemes based on self-capacitance detection and mutual capacitance, two kinds of basic schemes are all have conductor (finger as people) to realize identifying operation near the small capacitance change caused by capacitive touch device by detecting.And generally, the size of the measured capacitance that the capacitance change caused by conductor approaching device has much smaller than device, these measured capacitance comprise the self-capacitance that screen self has, screen stray capacitance.Due to the existence of measured capacitance, limit the valid analysing range of testing circuit, thus limit the raising to small capacitance change detection sensitivity.
Measured capacitance can be interpreted as the restriction of valid analysing range, due to the small capacitance variable quantity of conductor (finger as people) caused by the capacitive touch device much smaller than device the measured capacitance that has, even if the measured capacitance 30% that the large auto levelizer of this variable quantity has, so, when making full use of, the output that existing scheme also has 70% consume by measured capacitance, so the sensitivity of testing circuit becomes the problem needing to solve.
Summary of the invention
The technical matters that the present invention solves is that in prior art, conductor is when capacitive touch device, and capacitance change is less compared with measured capacitance change, the problem that detection sensitivity is lower.
For solving the problems of the technologies described above, the invention provides following technical scheme:
A kind of capacitance-type touch control detection circuit, for detecting the variable quantity of measured capacitance, comprising: constant pressure source, for charging to measured capacitance; First switch, for controlling the duration of charging of measured capacitance; Compensating module, for reducing a predetermined electricity by the electricity of measured capacitance; Amplification module, for reducing the measured capacitance voltage amplification of electricity.
The present invention also provides a kind of capacitance touching control pick-up unit, comprising: measured capacitance; Constant pressure source, for charging to measured capacitance; First switch, for controlling the duration of charging of measured capacitance, constant pressure source, the first switch, measured capacitance are connected; First control circuit, for controlling the described conducting of the first switch and the time of disconnection; Compensating module, for reducing a predetermined electricity by the electricity of measured capacitance; Amplification module, for reducing the measured capacitance voltage amplification of electricity.
The present invention also provides another kind of capacitive touch detection method, comprises the following steps: step one: utilize constant pressure source to charge to measured capacitance, and the duration of charging of measured capacitance is the ON time that first control circuit controls the first switch; Step 2: the first switch utilizes compensating circuit that the electricity of measured capacitance is reduced a predetermined electricity after disconnecting; Step 3: utilize amplification module the measured capacitance voltage amplification reducing electricity to be exported.
Compared with prior art the present invention has following beneficial effect: the capacitance-type touch control detection circuit that the embodiment of the present invention provides, pick-up unit and detection method thereof, after the electricity of measured capacitance being reduced a predetermined electricity by compensating module, amplified by amplification module again, because the electricity of measured capacitance reduces, and then the voltage on it reduces, making the capacitance change in measured capacitance relative to capacitance change when not having a compensating module increases, and then testing circuit improves sensitivity.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention capacitance-type touch control detection circuit theory diagram.
Fig. 2 is embodiment of the present invention capacitance-type touch control detection circuit schematic diagram.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is embodiment of the present invention capacitance-type touch control detection circuit theory diagram; A kind of capacitance-type touch control detection circuit, for detecting the variable quantity of measured capacitance, comprising: constant pressure source VTX, for charging to measured capacitance; First switch S 1, for controlling the duration of charging of measured capacitance, constant pressure source VTX, the first switch S 1, measured capacitance are connected successively; First control circuit 20, for controlling the described conducting of the first switch and the time of disconnection; Compensating module 10, for reducing a predetermined electricity by the electricity of measured capacitance; Amplification module 11, for reducing the measured capacitance voltage amplification of electricity.The capacitance-type touch control detection circuit that the embodiment of the present invention provides, after the electricity of measured capacitance being reduced a predetermined electricity by compensating module 10, amplified by amplification module 11 again, because the electricity of measured capacitance reduces, and then the voltage on it reduces, making the capacitance change in measured capacitance relative to capacitance change when not having a compensating module increases, and then testing circuit improves sensitivity.
Fig. 2 is embodiment of the present invention capacitance-type touch control detection circuit schematic diagram; On the basis of Fig. 1, compensating module 10 comprises comparer U1, second control circuit 101, building-out capacitor C0, the 3rd resistance R3, the 3rd switch S 3, second switch S2; The first input end of described comparer U1 connects reference voltage, and second input end of comparer U1 is connected with earth signal by building-out capacitor, and the output terminal of comparer U1 is connected with the control end of the 3rd switch S 3 by second control circuit 101; Second switch S2, the 3rd resistance R3, the 3rd switch S 3 connect the second input end of measured capacitance and comparer after connecting successively.Compensating module 10 also comprises the 4th switch S 4, and described 4th switch S 4 is in parallel with building-out capacitor C0, and described first control circuit 20 controls conducting and the disconnection of the 4th switch S 4.The first input end of comparer U1 is positive input terminal, and second input end of comparer U1 is negative input end.On the basis of Fig. 1, amplification module 11 comprises operational amplifier U2, the first resistance R1 and the second resistance R2; The output terminal of the rear concatenation operation amplifier U2 of described first resistance R1 and the second resistance R2 series connection and earth signal, the first input end of described operational amplifier U2 connects the node of second switch S2 and the 3rd resistance R3 series connection, and second input end of operational amplifier U2 connects the node of the first resistance R1 and the second resistance R2 series connection.The first input end of operational amplifier U2 is positive input terminal, and second input end of operational amplifier U2 is negative input end.
Compensating module 10, by moving away a certain amount of electricity, compensates the impact that measured capacitance causes, and the variable quantity that such conductor causes near the relative measured capacitance of electric quantity change caused by capacitive touch device increases.After first control circuit 20 controls the first switch S 1 disconnection, second switch S2 and the 3rd switch S 3 conducting, electricity on measured capacitance C1 starts to shift to building-out capacitor C0, to reduce the voltage of measured capacitance C1 top crown node A until to identical with Node B, by arranging the reference voltage Vref of comparer U1, the voltage on building-out capacitor C0 can be made to arrive Vref after at every turn, the 3rd switch S 3 will be disconnected because comparer exports oppositely, so just displaced a part of electricity on the top crown of building-out capacitor C0, on corresponding measured capacitance C1, electricity reduces, node B voltage declines.Different degree of compensation can be realized like this by control Vref.After completing single compensation, the 4th switch S 4 can also be controlled close by first control circuit 20, the electricity on building-out capacitor C0 has been bled off the reset of compensating circuit.
Its principle of work is below described in detail in detail:
Constant pressure source VTX selects controllable constant potential source, by replacing the charging of direct-drive spike to the constant-current charge of electric capacity, effectively can suppress circuit noise.First control circuit 20 completes excitation and testing process, first the first switch S 1 conducting by the conducting of control first switch S 1 and second switch S2 and disconnection, and when second switch S2 disconnects, constant pressure source charges to measured capacitance C1; After charging complete, first control circuit 20 controls the first switch S 1 and disconnects, second switch S2 conducting, the electricity that measured capacitance C1 obtains is converted to voltage and exports, thus measure the size of measured capacitance C1.The control signal of the first switch S 1, second switch S2 is two nonoverlapping switching signals, can control the first switch S 1, the conducting of second switch S2 and disconnection successively.Then after the electricity of measured capacitance C1 being reduced a predetermined electricity by compensating module 10, amplified by amplification module 11 again, because the electricity of measured capacitance C1 reduces, and then the voltage on it reduces, making the capacitance change in measured capacitance relative to capacitance change when not having a compensating module increases, and then testing circuit improves sensitivity.
With a specific embodiment in detail its principle of work is described in detail below:
Before circuit is started working, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4 disconnect.When circuit is started working, first control circuit 20 controls the first switch S 1 conducting, constant pressure source VTX (setting constant pressure source size as U1) is to measured capacitance C1 charging, and the electricity injected to measured capacitance C1 is Q1=U1*C1, then node A voltage is the voltage U 1 on measured capacitance C1.Then first control circuit 20 controls second switch S2 conducting, 3rd switch S 3 is controlled by second control circuit 101,3rd switch S 3 conducting, because the voltage on building-out capacitor C0 is 0, then Node B is charged to building-out capacitor C0 by the 3rd resistance R3, building-out capacitor C0 top crown voltage rise, when building-out capacitor C0 top crown voltage is raised to reference voltage Vref, because comparer exports oppositely, through the control of second control circuit 101,3rd switch S 3 is disconnected, and single compensation completes.At this moment owing to having certain electricity Qc=Vref*C0 to be transferred in the original electricity Q1 of measured capacitance C1, so the voltage drop of Node B, this voltage just can export through larger gain amplifier.
If needing to do repeatedly compensates, then, after the 3rd switch S 3 disconnects, first control circuit 20 controls the 4th switch S 4 conducting, and the electricity Qc of building-out capacitor C0 top crown will release.Then control the 4th switch S 4 to disconnect, then control the 3rd switch S 3 by second control circuit 101, and triggering compensates, until the 3rd switch S 3 again disconnects under the control of second control circuit 101 next time.Repeat this operation just can realize repeatedly compensating.After last circuit completes compensate function, also need closed 4th switch S 4, reset that the 3rd switch S 3 completes whole circuit.
Below lift a specific embodiment so that detailed operation principle of the present invention to be described:
The dynamic output range supposing circuit is 3V, and namely output voltage VO UT is 3V to the maximum.
When measured capacitance C1 no touch, after the first switch S 1 conducting, if constant pressure source makes the voltage of node A be Vnotouch=0.5V, before compensating circuit 10 works, node B voltage is 0.5V.After compensating circuit 10 works, because fixing has bled off certain electricity Qc=Vref*C0, the voltage of such Node B will decline, and set and reduce to 0.2V, then the voltage Vnotouch=0.5V-0.2V=0.3V of now Node B.
When measured capacitance C1 has touch, if after measured capacitance C1 increases the 25%, first switch S 1 conducting, if constant pressure source makes the voltage of node A be Vnotouch=0.5V.Before compensating circuit work, node B voltage is 0.5V.After compensating circuit work, because fixing has bled off certain electricity Qc=Vref*C0, the voltage of Node B will decline, this voltage drop is not linear, suppose to have dropped 0.2/1.25=0.16V, then the voltage Vtouch=0.5V-0.16V=0.34V of now Node B, limits by dynamic output range 3V, and gain is maximum is set to 3/0.34=8.8 doubly; At this moment the output voltage of no touch is 0.3*8.8=2.64V, has the output voltage of touch to be 0.34*8.8=2.99V.When measured capacitance C1 changes 25%, the touch variable quantity detected is 2.99-2.64=0.35V.
If compensate strengthen, if namely no touch time, compensate cause node B voltage decline 0.4V, then the voltage Vnotouch=0.5V-0.4V=0.1V of Node B.When having touch, respective nodes B voltage drop is Vtouch=0.5-(0.4/1.25)=0.18V, limit by dynamic output range, gain is maximum is about 3/0.18=16.6 doubly, at this moment the output voltage VO UT of no touch is 0.1*16.6=1.66, has the output voltage VO UT of touch to be 0.18*16.6=2.99.When electric capacity C1 changes 25%, the touch variable quantity detected is 2.99-1.66=1.33V.
And if do not adopt other testing circuits of compensation mechanism, when measured capacitance C1 changes 25%, even if utilize the maximum gain of amplifier equally, the touch variable quantity that it detects can not be greater than its dynamic output range * 25%, when dynamic output range is 3V, the touch variable quantity that this detects can not be greater than 3*0.25=0.75V.And touch variable quantity in the above-described embodiments reaches 1.33V, improve the detection sensitivity of circuit.
The gain of amplification module 11 is larger, the variable quantity of measured capacitance can be amplified larger multiple, thus improve detection sensitivity, but due to the existence of measured capacitance, the voltage that measured capacitance causes also by the amplification of equimultiple, can consume very large output voltage range.Add compensating circuit in the embodiment of the present invention, so by compensating the voltage reducing measured capacitance and cause, thus the effective utilization to output voltage range can be improved, obviously, compensating larger, reducing larger to the voltage caused of measured capacitance.
If regulate compensation intensity in the embodiment of the present invention, there are three kinds of methods:
First: can adjusting reference voltage Vref, due to Qc=Vref*C0, just can compensation be increased by increasing Vref, on the contrary reduction.
Second: regulate building-out capacitor C0, just can increase compensation by increasing building-out capacitor C0, otherwise reduce.The adjustment of C0, a kind of feasible method be building-out capacitor C0 is made can switching gate connect capacitor array.
3rd: regulate and compensate number of times, namely introduce total compensation electricity Qc_total=Qc*n, n for compensating number of times; If when needing to increase compensation, compensation number of times can be increased the touch variable quantity of output is increased.Such increase compensates number of times just can increase compensation, otherwise reduces.
Different capacitive contactor control devices has different measured capacitance C1, and in order to reach better compatible result, circuit design becomes to have the function of calibration arrangements, can according to different measured capacitance C1, by regulating compensation rate to realize optimum output voltage.Both can regulate compensation rate by above three kinds of methods, obtain best output voltage.
The present invention also provides a kind of capacitance touching control pick-up unit, refers to Fig. 1, and this device comprises: measured capacitance C1; Constant pressure source VTX, for charging to measured capacitance; First switch S 1, for controlling the duration of charging of measured capacitance, constant pressure source VTX, the first switch S 1, measured capacitance are connected successively; First control circuit 20, for controlling the described conducting of the first switch S 1 and the time of disconnection; Compensating module 10, for reducing a predetermined electricity by the electricity of measured capacitance; Amplification module 11, for reducing the measured capacitance voltage amplification of electricity.Its each several part circuit, principle of work are all substantially identical with each module in above-mentioned capacitance-type touch control detection circuit, principle of work, repeat no more herein.
The present invention also provides another kind of capacitive touch detection method, comprises the following steps: step one: utilize constant pressure source to charge to measured capacitance, and the duration of charging of measured capacitance is the ON time that first control circuit controls the first switch; Step 2: the first switch utilizes compensating circuit that the electricity of measured capacitance is reduced a predetermined electricity after disconnecting; Step 3: utilize amplification module the measured capacitance voltage amplification reducing electricity to be exported.The method is based on the aforementioned condenser type testing circuit that provides and device, after the electricity of measured capacitance being reduced a predetermined electricity by compensating module, amplified by amplification module again, because the electricity of measured capacitance reduces, and then the voltage on it reduces, making the capacitance change in measured capacitance relative to capacitance change when not having a compensating module increases, and then testing circuit improves sensitivity.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a capacitance-type touch control detection circuit, for detecting the variable quantity of measured capacitance, is characterized in that, comprising:
Constant pressure source, for charging to measured capacitance;
First switch, for controlling the duration of charging of measured capacitance, constant pressure source, the first switch, measured capacitance are connected;
First control circuit, for controlling the described conducting of the first switch and the time of disconnection;
Compensating module, for moving away one of measured capacitance predetermined electricity from described capacitance-type touch control detection circuit;
Amplification module, for the voltage amplification of the measured capacitance by moving away a predetermined electricity;
Described compensating module comprises comparer, second control circuit, building-out capacitor, the 3rd resistance, the 3rd switch, second switch; The first input end of described comparer connects reference voltage, and the second input end of comparer is connected with earth signal by building-out capacitor, and the output terminal of comparer is connected by the control end of second control circuit with the 3rd switch; Second switch, the 3rd resistance, the 3rd switch connect the second input end of measured capacitance and comparer after connecting successively; Described first control circuit controls conducting and the disconnection of second switch, and described compensating module also comprises the 4th switch, and described 4th switch is in parallel with building-out capacitor, and described first control circuit controls conducting and the disconnection of the 4th switch.
2. capacitance-type touch control detection circuit according to claim 1, is characterized in that, the first input end of described comparer is positive input terminal, and the second input end of described comparer is negative input end.
3. capacitance-type touch control detection circuit according to claim 1, is characterized in that, described amplification module comprises operational amplifier, the first resistance and the second resistance; The output terminal of concatenation operation amplifier and earth signal after described first resistance and the second resistant series, the first input end of described operational amplifier connects the node of second switch and the 3rd resistant series, and the second input end of operational amplifier connects the node of the first resistance and the second resistant series.
4. capacitance-type touch control detection circuit according to claim 3, is characterized in that, the first input end of described operational amplifier is positive input terminal, and the second input end of described operational amplifier is negative input end.
5. a capacitance touching control pick-up unit, is characterized in that, comprising:
Measured capacitance;
Constant pressure source, for charging to measured capacitance;
First switch, for controlling the duration of charging of measured capacitance, constant pressure source, the first switch, measured capacitance are connected;
First control circuit, for controlling the described conducting of the first switch and the time of disconnection;
Compensating module, for moving away one of measured capacitance predetermined electricity from described capacitance-type touch control detection circuit;
Amplification module, for the voltage amplification of the measured capacitance by moving away a predetermined electricity;
Described compensating module comprises comparer, second control circuit, building-out capacitor, the 3rd resistance, the 3rd switch, second switch; The first input end of described comparer connects reference voltage, and the second input end of comparer is connected with earth signal by building-out capacitor, and the output terminal of comparer is connected by the control end of second control circuit with the 3rd switch; Second switch, the 3rd resistance, the 3rd switch connect the second input end of measured capacitance and comparer after connecting successively; Described first control circuit controls conducting and the disconnection of second switch, and described compensating module also comprises the 4th switch, and described 4th switch is in parallel with building-out capacitor, and described first control circuit controls conducting and the disconnection of the 4th switch.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103150076B (en) * | 2013-03-28 | 2018-10-23 | 苏州瀚瑞微电子有限公司 | A method of realizing initial calibration of touch chip |
| CN105242804B (en) * | 2015-09-21 | 2017-11-24 | 京东方科技集团股份有限公司 | Touch-control compensation circuit, its compensation method, touch-screen and display device |
| WO2019090528A1 (en) | 2017-11-08 | 2019-05-16 | 深圳市汇顶科技股份有限公司 | Capacitance detection device, touch device and terminal device |
| CN109818604A (en) * | 2019-04-03 | 2019-05-28 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | A kind of high-precision difference capacitor MEMS interface circuit and MEMS device |
| CN110196653B (en) * | 2019-04-26 | 2020-09-11 | 北京集创北方科技股份有限公司 | Touch detection circuit, touch display device and touch detection method |
| CN111522469B (en) * | 2020-05-06 | 2021-08-20 | 北京集创北方科技股份有限公司 | Touch capacitance data adjusting method and device, electronic equipment and storage medium |
| CN111650441B (en) * | 2020-06-11 | 2022-05-17 | 上海艾为电子技术股份有限公司 | Capacitance detection circuit, capacitance detection method and electronic equipment |
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Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. |