CN103902123A - Self-capacitance touch sensing device capable of reducing substrate capacitance - Google Patents
Self-capacitance touch sensing device capable of reducing substrate capacitance Download PDFInfo
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- CN103902123A CN103902123A CN201410044267.0A CN201410044267A CN103902123A CN 103902123 A CN103902123 A CN 103902123A CN 201410044267 A CN201410044267 A CN 201410044267A CN 103902123 A CN103902123 A CN 103902123A
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Abstract
The invention provides a self-capacitance touch sensing device capable of reducing substrate capacitance. The self-capacitance touch sensing device capable of reducing the substrate capacitance comprises a self-capacitance touch screen and a signal processing module. The signal processing module comprises an integrated operational amplifier, a feedback capacitor, a substrate capacitor and a controlled switch. The reverse-phase input end of the integrated operational amplifier is electrically connected with a channel capacitor. By the adoption of the self-capacitance touch sensing device capable of reducing the substrate capacitance, in the pre-discharge stage, the channel capacitor is made to discharge electricity, and at least one of the substrate capacitor and the feedback capacitor is charged; in the sensing stage, the channel capacitor is charged, and the charge variable quantity, caused by touch, of a branch where the channel capacitor is located is output from the output end of the integrated operational amplifier. According to the self-capacitance touch sensing device capable of reducing the substrate capacitance, the charge mode of the substrate capacitor is changed through pre-storing of electric charge on the feedback capacitor, the quantity of electric charge which can be provided by the substrate capacitor is increased, and then the substrate capacitance is reduced; in this way, the area of a chip is reduced, process cost is reduced, and the self-capacitance touch sensing device can be lighter and thinner.
Description
Technical field
The present invention relates to the circuit that the signal to collecting carries out signal processing, particularly relate to the circuit that charge variation amount signal that touch-screen is collected carries out signal processing.
Background technology
A prior art capacitance touch sensing device, as shown in Figure 5, comprises self-capacitance touch screen 4 for gathering the touching information that causes capacitance variations and for detecting the signal processing circuit 3 of capacitance change.Described self-capacitance touch screen 4 is C because the electrode arranging forms capacitance
seach passage electric capacity 41.Prior art signal processing circuit 3 comprises integrated operational amplifier 34, and the capacitance being connected electrically between inverting input and the output terminal of this integrated operational amplifier 34 is C
ffeedback capacity 32, and its one end inverting input, other end of being connected electrically in integrated operational amplifier 34 be transfused to voltage square wave signal, capacitance is the substrate electric capacity 31 of Cb.Described voltage square wave signal fluctuates between the first voltage and second voltage, and the first voltage is greater than second voltage.In the time that detecting is connected electrically in the capacitance change on the passage electric capacity 41 place branch roads in signal processing circuit 3, conventionally need to experience two stages.First stage is the pre-arcing stage, as shown in Figure 5, controlled switch 35,36 closed conductings, and controlled switch 37 turn-offs open circuit, the signal that the basad electric capacity output voltage of described voltage square wave signal is V1, thereby the electric charge that passage electric capacity 41 is stored is released, substrate electric capacity 31 is applied in the voltage of (V1-Vref), and the electric charge that feedback capacity 32 is stored is also released.Second stage is reconnaissance phase, as shown in Figure 5, controlled switch 35,36 turn-offs open circuit, and the controlled closed conducting of switch 37, the signal that the basad electric capacity output voltage of described voltage square wave signal is V2, in to the charging process of passage electric capacity 41, the feedback circuit consisting of feedback capacity 32 and integrated operational amplifier 34 detects the charge variation causing because of touching of passage electric capacity 41 place branch roads, and the electric current forming because of charge variation from the output terminal output of integrated operational amplifier 34.The current potential of the output terminal of described integrated operational amplifier 34 is V3.According to quantity of electric charge conservation principle, meet at the inverting input of integrated operational amplifier 34,
C
b×（V1－V2）=C
f×（Vref－V3）+C
S×Vref，
And then draw,
C
b= [C
f×（Vref－V3）+C
S×Vref]/ （V1－V2） （1）。
No matter described self-capacitance touch screen 4 and signal processing circuit 3 are arranged in same chip, are still separately positioned on more than two in chip, and the size of substrate electric capacity 31 has determined the area of signal processing circuit 3 place chips.From (1) formula, when passage capacitor C
swhen increase, C
balso can increase thereupon, and then cause chip area to increase, not only increase process costs, also affect self-capacitance touch sensing device to lightening future development.
Summary of the invention
The technical problem to be solved in the present invention be to avoid the deficiencies in the prior art part and the capacitance that proposes a kind of substrate electric capacity not with passage capacitance variations, can reduce the self-capacitance touch sensing device of substrate electric capacity, thereby can reduce chip area, save process costs.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Design, manufacture a kind of self-capacitance touch sensing device that can reduce substrate electric capacity, comprise for touched self-capacitance touch screen, and for detecting at least one signal processing module of self-capacitance variable signal; Described self-capacitance touch screen forms more than one passage electric capacity because electrode is set; Described signal processing module comprises integrated operational amplifier, for being connected electrically in the feedback capacity between this integrated operational amplifier inverting input and output terminal, and substrate electric capacity; Described substrate electric capacity one end input voltage square-wave signal, the other end of this substrate electric capacity is for being electrically connected the inverting input of described integrated operational amplifier; Described voltage square wave signal fluctuates between the first voltage and second voltage, and the first voltage is greater than second voltage; The normal phase input end of described integrated operational amplifier is transfused to reference potential, the inverting input electrical connecting passage electric capacity of this integrated operational amplifier, thus described signal processing module is detected the capacitance change that this passage electric capacity place branch road forms because of touching.Especially, described signal processing module also comprises at least one controlled switch; Realize by being electrically connected each controlled switch, in the pre-arcing stage, make passage capacitor discharge, at least one capacitor charging in substrate electric capacity and feedback capacity; In reconnaissance phase, to passage capacitor charging, passage electric capacity place branch road is exported from the output terminal of integrated operational amplifier because touching the charge variation amount occurring.
A kind of scheme is that described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; Make feedback capacity disconnect and being electrically connected of integrated operational amplifier, and this feedback capacity maintain because being applied in to feed back and maintain the electric charge that voltage is stored; The basad electric capacity of described voltage square wave signal is inputted the first voltage.In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal; Described feedback capacity is connected electrically between the inverting input and output terminal of operational amplifier, and this feedback capacity is maintained and applies feedback and maintain voltage; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
Particularly, described controlled switch comprises the first to second electric discharge controlled switch, and the first to the 5th detecting controlled switch; Described feedback capacity comprises first end and the second end.The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier.The first detecting controlled switch is connected electrically between the first end of feedback capacity and the inverting input of integrated operational amplifier; The second detecting controlled switch is connected electrically between second end and the output terminal of operational amplifier of feedback capacity; First end and output feedback that the 3rd detecting controlled switch is connected electrically in feedback capacity maintain between the port of voltage; The 4th detecting controlled switch is connected electrically between second end and signal ground of feedback capacity; Described the 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier.
Another kind of scheme is that described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; The disconnection of substrate electric capacity is electrically connected with integrated operational amplifier, and these substrate electric capacity two ends are applied in the first voltage of voltage square wave signal and charge.In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier of this substrate electric capacity; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
Particularly, described controlled switch comprises the first to the 3rd electric discharge controlled switch, and the 5th to the 6th detecting controlled switch; Described substrate electric capacity comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier.The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier; The 3rd electric discharge controlled switch is connected electrically between second end and signal ground of substrate electric capacity.The 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier; The 6th detecting controlled switch is connected electrically between second end and the inverting input of integrated operational amplifier of substrate electric capacity.
The combination of above two schemes, described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; Feedback capacity disconnects and being connected electrically in of integrated operational amplifier, and this feedback capacity maintains because being applied in feedback and maintains the electric charge that voltage is stored; The disconnection of substrate electric capacity is electrically connected with integrated operational amplifier, and these substrate electric capacity two ends are applied in the first voltage of voltage square wave signal and charge.In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier of this substrate electric capacity; Described feedback capacity is connected electrically between the inverting input and output terminal of operational amplifier, and this feedback capacity is maintained and applies feedback and maintain voltage; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
Particularly, described controlled switch comprises the first to the 3rd electric discharge controlled switch, and the first to the 6th detecting controlled switch; Described feedback capacity comprises first end and the second end; Described substrate electric capacity comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier.The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier; The 3rd electric discharge controlled switch is connected electrically between second end and signal ground of substrate electric capacity.The first detecting controlled switch is connected electrically between the first end of feedback capacity and the inverting input of integrated operational amplifier; The second detecting controlled switch is connected electrically between second end and the output terminal of operational amplifier of feedback capacity; First end and output feedback that the 3rd detecting controlled switch is connected electrically in feedback capacity maintain between the port of voltage; The 4th detecting controlled switch is connected electrically between second end and signal ground of feedback capacity; The 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier; The 6th detecting controlled switch is connected electrically between second end and the inverting input of integrated operational amplifier of substrate electric capacity.
More specifically, passage capacitor C S, substrate capacitor C b, feedback capacity Cf, reference potential, the first voltage V1 and the second voltage V2 of voltage square wave signal, the output terminal current potential V3 of integrated operational amplifier, and feedback maintains between voltage V4 and to meet,
C
b×（V1－V2+Vref）+C
f×（Vref－V3－V4）=C
S×Vref。
Compared with the existing technology the technique effect that, the present invention " can reduce the self-capacitance touch sensing device of substrate electric capacity " is:
1. the present invention is by the quantity of electric charge that prestores in feedback capacity, reduce the quantity of electric charge that substrate electric capacity need to provide, thereby the in the situation that of same channels electric capacity, reduce substrate capacitance, in the situation that passage electric capacity increases, maintain substrate capacitance constant even reduce substrate capacitance, and then reduce chip area, not only save process costs, can also make self-capacitance touch sensing device towards lighter and thinner future development;
2. the relative prior art of the present invention changes the charging modes of substrate electric capacity, make substrate electric capacity just have certain quantity of electric charge in the pre-arcing stage, increase the quantity of electric charge that substrate electric capacity can provide, thereby the in the situation that of same channels electric capacity, reduce substrate capacitance, in the situation that passage electric capacity increases, maintain substrate capacitance constant even reduce substrate capacitance, and then minimizing chip area, not only save process costs, can also make self-capacitance touch sensing device towards lighter and thinner future development.
Brief description of the drawings
Fig. 1 is the electric principle schematic of the present invention first embodiment that " can reduce the self-capacitance touch sensing device of substrate electric capacity ";
Fig. 2 is the voltage square wave signal schematic diagram of described the first embodiment;
Fig. 3 is the electric principle schematic of second embodiment of the invention;
Fig. 4 is the electric principle schematic of third embodiment of the invention;
Fig. 5 is the electric principle schematic of prior art self-capacitance touch sensing device.
Embodiment
Be described in further detail below in conjunction with each embodiment shown in accompanying drawing.
The present invention proposes a kind of self-capacitance touch sensing device that can reduce substrate electric capacity, as shown in Figures 1 to 4, comprises for touched self-capacitance touch screen 2, and for detecting at least one signal processing module 1 of self-capacitance variable signal; Because electrode is set, to form more than one, capacitance be C to described self-capacitance touch screen 2
spassage electric capacity 21; Described signal processing module 1 comprises integrated operational amplifier 14, for be connected electrically between these integrated operational amplifier 14 inverting inputs and output terminal, capacitance is C
ffeedback capacity 12, and capacitance is C
bsubstrate electric capacity 11.Described substrate electric capacity 11 one end input voltage square-wave signals, the other end of this substrate electric capacity 11 is for being electrically connected the inverting input of described integrated operational amplifier 14.As shown in Figure 2, described voltage square wave signal fluctuates between the first voltage and second voltage, and the first voltage is greater than second voltage.The normal phase input end of described integrated operational amplifier 14 is transfused to reference potential Vref, the inverting input electrical connecting passage electric capacity 21 of this integrated operational amplifier 14, thereby the capacitance change that described signal processing module 1 these passage electric capacity 21 place branch roads of detecting form because of touching.Especially, described signal processing module 1 also comprises at least one controlled switch.Realize by being electrically connected each controlled switch, at pre-arcing stage T1, make passage electric capacity 21 discharge, at least one capacitor charging in substrate electric capacity 11 and feedback capacity 12; At reconnaissance phase T2, passage electric capacity 21 is charged, passage electric capacity 21 place branch roads are exported from the output terminal of integrated operational amplifier 14 because touching the charge variation amount occurring.
The good scheme of a kind of effect, described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.At pre-arcing stage T1, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge 21 that makes signal processing module 1 be electrically connected; Feedback capacity 12 disconnects and being connected electrically in of integrated operational amplifier 14, and this feedback capacity 12 maintains because being applied in feedback and maintains the electric charge that voltage is stored; 11 disconnections of substrate electric capacity are electrically connected with integrated operational amplifier 14, and these substrate electric capacity 11 two ends are applied in the first voltage of voltage square wave signal and charge.At reconnaissance phase T2, described each electric discharge controlled switch turn-offs open circuit, the closed conducting of each detecting controlled switch, described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier 14 of this substrate electric capacity 11; Described feedback capacity 12 is connected electrically between the inverting input and output terminal of operational amplifier 14, and this feedback capacity 12 is maintained and applies feedback and maintain voltage; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.
First embodiment of the invention, as shown in Figure 1, in order to realize such scheme, described controlled switch comprises the first to the 3rd electric discharge controlled switch 1511,1512,1513, and the first to the 6th detecting controlled switch 1521,1522,1523,1524,1525,1526.Described feedback capacity 12 comprises first end and the second end; Described substrate electric capacity 11 comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier 14.The first electric discharge controlled switch 1511 parallel connections are connected electrically in passage electric capacity 21.The second electric discharge controlled switch 1512 is connected electrically between the inverting input and output terminal of integrated operational amplifier 14.The 3rd electric discharge controlled switch 1513 is connected electrically between second end and signal ground of substrate electric capacity 11.The first detecting controlled switch 1521 is connected electrically between the first end of feedback capacity 12 and the inverting input of integrated operational amplifier 14.The second detecting controlled switch 1522 is connected electrically between the second end of feedback capacity 12 and the output terminal of operational amplifier 14.First end and output feedback that the 3rd detecting controlled switch 1523 is connected electrically in feedback capacity 12 maintain between the port of voltage V4.The 4th detecting controlled switch 1524 is connected electrically between second end and signal ground of feedback capacity 12.The 5th detecting controlled switch 1525 is connected electrically in passage electric capacity 21 not to be had between the port of ground connection and the inverting input of operational amplifier 14.The 6th detecting controlled switch 1526 is connected electrically between the second end of substrate electric capacity 11 and the inverting input of integrated operational amplifier 14.Thereby realize, at pre-arcing stage T1, the described first to the 3rd electric discharge controlled switch 1511,1512,1513 closed conductings, the first to the 6th detecting controlled switch 1521,1522,1523,1524,1525,1526 turn-offs open circuit, the passage capacitor discharge 21 that makes signal processing module 1 be electrically connected; Feedback capacity 12 disconnects and being connected electrically in of integrated operational amplifier 14, and this feedback capacity 12 maintains because being applied in feedback and maintains the electric charge that voltage V4 stores; 11 disconnections of substrate electric capacity are electrically connected with integrated operational amplifier 14, and these substrate electric capacity 11 two ends are applied in the first voltage V1 of voltage square wave signal and charge.At reconnaissance phase T2, the described first to the 3rd electric discharge controlled switch 1511,1512,1513 turn-offs open circuit, the first to the 6th detecting controlled switch 1521,1522,1523,1524,1525,1526 closed conductings, described substrate electric capacity 11 one end are transfused to the second voltage V2 of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier 14 of this substrate electric capacity 11; Described feedback capacity 12 is connected electrically between the inverting input and output terminal of operational amplifier 14, and this feedback capacity 12 is maintained and applies feedback and maintain voltage V4; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.The output terminal current potential of described operational amplifier 14 is V3.
According to principle of charge conservation, first embodiment of the invention, at the inverting input of integrated operational amplifier 14, described passage capacitor C
s, substrate capacitor C
b, feedback capacity C
f, reference potential, the first voltage V1 and the second voltage V2 of voltage square wave signal, the output terminal current potential V3 of integrated operational amplifier, and feedback maintains between voltage V4 and to meet,
C
b×（V1－V2+Vref）+C
f×（Vref－V3－V4）=C
S×Vref。
Visible, passage electric capacity 21 is provided by substrate electric capacity 11 and feedback capacity 12 at the required electric charge of charging process, and substrate electric capacity 11 is because the voltage (V1-Vref) that the voltage V1 being applied in the pre-arcing stage is applied in the pre-anti-electric stage compared with prior art increases, the electric charge that substrate electric capacity of the present invention provides is more compared with prior art, thereby make the in the situation that of same channels electric capacity 21, reduce substrate capacitance, in the situation that passage electric capacity 21 increases, maintain substrate capacitance constant even reduce substrate capacitance, and then minimizing chip area, not only save process costs, can also make self-capacitance touch sensing device towards lighter and thinner future development.
First embodiment of the invention adopts and uses as the prestore quantity of electric charge and change two kinds of means of substrate capacitor charge and discharge mode and realize and reduce substrate capacitances of feedback capacity simultaneously, is prestore quantity of electric charge means and change substrate capacitor charge and discharge mode means and can also adopt respectively and reach the effect that reduces substrate capacitance of feedback capacity so.
Be adopted as the feedback capacity quantity of electric charge means that prestore, described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.At pre-arcing stage T1, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, makes the passage electric capacity 21 that signal processing module 1 is electrically connected discharge; Make feedback capacity 12 disconnect and being electrically connected of integrated operational amplifier 14, and this feedback capacity 12 maintain because being applied in to feed back and maintain the electric charge that voltage is stored; The basad electric capacity 11 of described voltage square wave signal is inputted the first voltage.In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity 11 one end are transfused to the second voltage of voltage square wave signal; Described feedback capacity 12 is connected electrically between the inverting input and output terminal of operational amplifier 14, and this feedback capacity 14 is maintained and applies feedback and maintain voltage; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.
Second embodiment of the invention, as shown in Figure 3, described controlled switch comprises the first to second electric discharge controlled switch 1511,1512, and the first to the 5th detecting controlled switch 1521,1522,1523,1524,1525.Described feedback capacity 12 comprises first end and the second end.The first electric discharge controlled switch 1511 parallel connections are connected electrically in passage electric capacity 21; The second electric discharge controlled switch 1512 is connected electrically between the inverting input and output terminal of integrated operational amplifier 14.The first detecting controlled switch 1521 is connected electrically between the first end of feedback capacity 12 and the inverting input of integrated operational amplifier 14.The second detecting controlled switch 1522 is connected electrically between the second end of feedback capacity 12 and the output terminal of operational amplifier 14.First end and output feedback that the 3rd detecting controlled switch 1523 is connected electrically in feedback capacity 12 maintain between the port of voltage V4.The 4th detecting controlled switch 1524 is connected electrically between second end and signal ground of feedback capacity 12.Described the 5th detecting controlled switch 1525 is connected electrically in passage electric capacity 21 not to be had between the port of ground connection and the inverting input of operational amplifier 14.At pre-arcing stage T1, described the first to second electric discharge controlled switch 1511,1512 closed conductings, the first to the 5th detecting controlled switch 1521,1522,1523,1524,1525 turn-offs open circuit, makes the passage electric capacity 21 that signal processing module 1 is electrically connected discharge; Make feedback capacity 12 disconnect and being electrically connected of integrated operational amplifier 14, and this feedback capacity 12 maintain because being applied in to feed back and maintain the electric charge that voltage V4 stores; The basad electric capacity 11 of described voltage square wave signal is inputted the first voltage V1.At reconnaissance phase T2, described the first to second electric discharge controlled switch 1511,1512 turn-offs open circuit, the first to the 5th detecting controlled switch 1521,1522,1523,1524,1525 closed conductings, described substrate electric capacity 11 one end are transfused to the second voltage V2 of voltage square wave signal; Described feedback capacity 12 is connected electrically between the inverting input and output terminal of operational amplifier 14, and this feedback capacity 14 is maintained and applies feedback and maintain voltage V4; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.Second embodiment of the invention, is only adopted as feedback capacity 12 quantity of electric charge means that prestore, and (C prestores
f× V4) quantity of electric charge, to reduce substrate capacitance.
Adopt and change substrate capacitor charge and discharge mode means, described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch.At pre-arcing stage T1, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, makes the passage electric capacity 21 that signal processing module 1 is electrically connected discharge; 11 disconnections of substrate electric capacity are electrically connected with integrated operational amplifier 14, and these substrate electric capacity 11 two ends are applied in the first voltage of voltage square wave signal and charge.At reconnaissance phase T2, described each electric discharge controlled switch turn-offs open circuit, the closed conducting of each detecting controlled switch, described substrate electric capacity 11 one end are transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier 14 of this substrate electric capacity 11; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.
Third embodiment of the invention, as shown in Figure 4, described controlled switch comprises the first to the 3rd electric discharge controlled switch 1511,1512,1513, and the 5th to the 6th detecting controlled switch 1525,1526.Described substrate electric capacity 11 comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier 14.The first electric discharge controlled switch 1511 parallel connections are connected electrically in passage electric capacity 21.The second electric discharge controlled switch 1512 is connected electrically between the inverting input and output terminal of integrated operational amplifier 14.The 3rd electric discharge controlled switch 1513 is connected electrically between second end and signal ground of substrate electric capacity 11.The 5th detecting controlled switch 1525 is connected electrically in passage electric capacity 21 not to be had between the port of ground connection and the inverting input of operational amplifier 14.The 6th detecting controlled switch 1526 is connected electrically between the second end of substrate electric capacity 11 and the inverting input of integrated operational amplifier 14.At pre-arcing stage T1, the described first to the 3rd electric discharge controlled switch 1511,1512,1513 closed conductings, the 5th to the 6th detecting controlled switch 1525,1526 turn-offs open circuit, makes the passage electric capacity 21 that signal processing module 1 is electrically connected discharge; 11 disconnections of substrate electric capacity are electrically connected with integrated operational amplifier 14, and these substrate electric capacity 11 two ends are applied in the first voltage V1 of voltage square wave signal and charge.At reconnaissance phase T2, the first to the 3rd electric discharge controlled switch 1511,1512,1513 turn-offs open circuit, the the 5th to the 6th detecting controlled switch 1525,1526 closed conductings, described substrate electric capacity 11 one end are transfused to the second voltage V2 of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier 14 of this substrate electric capacity 11; Described passage electric capacity 21 is charged, thus the electric current that the charge variation causing because of touching at operational amplifier 14 output terminal output channel electric capacity 21 place branch roads forms.Third embodiment of the invention, only adopt and change substrate electric capacity 11 charge and discharge system means, substrate electric capacity 11 is because the voltage (V1-Vref) that the voltage V1 being applied in the pre-arcing stage is applied in the pre-anti-electric stage compared with prior art increases, the electric charge that substrate electric capacity of the present invention provides is more compared with prior art, thereby make, the in the situation that of same channels electric capacity 21, to reduce substrate capacitance.
Claims (8)
1. can reduce a self-capacitance touch sensing device for substrate electric capacity, comprise for touched self-capacitance touch screen, and for detecting at least one signal processing module of self-capacitance variable signal; Described self-capacitance touch screen forms more than one passage electric capacity because electrode is set; Described signal processing module comprises integrated operational amplifier, for being connected electrically in the feedback capacity between this integrated operational amplifier inverting input and output terminal, and substrate electric capacity; Described substrate electric capacity one end input voltage square-wave signal, the other end of this substrate electric capacity is for being electrically connected the inverting input of described integrated operational amplifier; Described voltage square wave signal fluctuates between the first voltage and second voltage, and the first voltage is greater than second voltage; The normal phase input end of described integrated operational amplifier is transfused to reference potential, the inverting input electrical connecting passage electric capacity of this integrated operational amplifier, thus described signal processing module is detected the capacitance change that this passage electric capacity place branch road forms because of touching; It is characterized in that:
Described signal processing module also comprises at least one controlled switch; Realize by being electrically connected each controlled switch,
In the pre-arcing stage, make passage capacitor discharge, at least one capacitor charging in substrate electric capacity and feedback capacity;
In reconnaissance phase, to passage capacitor charging, passage electric capacity place branch road is exported from the output terminal of integrated operational amplifier because touching the charge variation amount occurring.
2. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 1, is characterized in that:
Described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch;
In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; Make feedback capacity disconnect and being electrically connected of integrated operational amplifier, and this feedback capacity maintain because being applied in to feed back and maintain the electric charge that voltage is stored; The basad electric capacity of described voltage square wave signal is inputted the first voltage;
In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal; Described feedback capacity is connected electrically between the inverting input and output terminal of operational amplifier, and this feedback capacity is maintained and applies feedback and maintain voltage; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
3. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 2, is characterized in that:
Described controlled switch comprises the first to second electric discharge controlled switch, and the first to the 5th detecting controlled switch; Described feedback capacity comprises first end and the second end;
The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier;
The first detecting controlled switch is connected electrically between the first end of feedback capacity and the inverting input of integrated operational amplifier; The second detecting controlled switch is connected electrically between second end and the output terminal of operational amplifier of feedback capacity; First end and output feedback that the 3rd detecting controlled switch is connected electrically in feedback capacity maintain between the port of voltage; The 4th detecting controlled switch is connected electrically between second end and signal ground of feedback capacity; Described the 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier.
4. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 1, is characterized in that:
Described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch;
In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; The disconnection of substrate electric capacity is electrically connected with integrated operational amplifier, and these substrate electric capacity two ends are applied in the first voltage of voltage square wave signal and charge;
In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier of this substrate electric capacity; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
5. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 4, is characterized in that:
Described controlled switch comprises that first puts to the 3rd electric discharge controlled switch, and the 5th to the 6th detecting controlled switch; Described substrate electric capacity comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier;
The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier; The 3rd electric discharge controlled switch is connected electrically between second end and signal ground of substrate electric capacity;
The 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier; The 6th detecting controlled switch is connected electrically between second end and the inverting input of integrated operational amplifier of substrate electric capacity.
6. require the described self-capacitance touch sensing device that can reduce substrate electric capacity according to right 1, it is characterized in that:
Described controlled switch comprises at least one electric discharge controlled switch, at least one detecting controlled switch;
In the pre-arcing stage, the closed conducting of described each electric discharge controlled switch, respectively detects controlled switch and turn-offs open circuit, the passage capacitor discharge that makes signal processing module be electrically connected; Feedback capacity disconnects and being connected electrically in of integrated operational amplifier, and this feedback capacity maintains because being applied in feedback and maintains the electric charge that voltage is stored; The disconnection of substrate electric capacity is electrically connected with integrated operational amplifier, and these substrate electric capacity two ends are applied in the first voltage of voltage square wave signal and charge;
In reconnaissance phase, described each electric discharge controlled switch turn-offs open circuit, respectively detects the closed conducting of controlled switch, and described substrate electric capacity one end is transfused to the second voltage of voltage square wave signal, the inverting input of the other end electrical connection integrated operational amplifier of this substrate electric capacity; Described feedback capacity is connected electrically between the inverting input and output terminal of operational amplifier, and this feedback capacity is maintained and applies feedback and maintain voltage; Described passage electric capacity is charged, thus the electric current that the charge variation causing because of touching at operational amplifier output terminal output channel electric capacity place branch road forms.
7. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 6, is characterized in that:
Described controlled switch comprises the first to the 3rd electric discharge controlled switch, and the first to the 6th detecting controlled switch; Described feedback capacity comprises first end and the second end; Described substrate electric capacity comprises the first end for being electrically connected voltage square wave signal, and for being electrically connected second end of end of oppisite phase of integrated operational amplifier;
The first electric discharge controlled switch parallel connection is connected electrically in passage electric capacity; The second electric discharge controlled switch is connected electrically between the inverting input and output terminal of integrated operational amplifier; The 3rd electric discharge controlled switch is connected electrically between second end and signal ground of substrate electric capacity;
The first detecting controlled switch is connected electrically between the first end of feedback capacity and the inverting input of integrated operational amplifier; The second detecting controlled switch is connected electrically between second end and the output terminal of operational amplifier of feedback capacity; First end and output feedback that the 3rd detecting controlled switch is connected electrically in feedback capacity maintain between the port of voltage; The 4th detecting controlled switch is connected electrically between second end and signal ground of feedback capacity; The 5th detecting controlled switch is connected electrically in passage electric capacity not to be had between the port of ground connection and the inverting input of operational amplifier; The 6th detecting controlled switch is connected electrically between second end and the inverting input of integrated operational amplifier of substrate electric capacity.
8. the self-capacitance touch sensing device that can reduce substrate electric capacity according to claim 6, is characterized in that:
Passage capacitor C
s, substrate capacitor C
b, feedback capacity C
f, reference potential, the first voltage V1 and the second voltage V2 of voltage square wave signal, the output terminal current potential V3 of integrated operational amplifier, and feedback maintains between voltage V4 and to meet,
C
b×（V1－V2+Vref）+C
f×（Vref－V3－V4）=C
S×Vref。
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| CN201410044267.0A CN103902123B (en) | 2014-01-30 | 2014-01-30 | Self-capacitance touch sensing device capable of reducing substrate capacitance |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106598370A (en) * | 2017-01-19 | 2017-04-26 | 北京集创北方科技股份有限公司 | Touch detection circuit and touch device thereof |
| WO2017092676A1 (en) * | 2015-12-02 | 2017-06-08 | 苏州迈瑞微电子有限公司 | Capacitive fingerprint sensor |
| WO2017114514A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Integrating circuit and capacitance sensing circuit |
| CN107980115A (en) * | 2017-11-08 | 2018-05-01 | 深圳市汇顶科技股份有限公司 | Capacitance detecting device, touch device and terminal device |
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| TWI693545B (en) * | 2019-04-26 | 2020-05-11 | 大陸商北京集創北方科技股份有限公司 | Touch chip, touch display device and information processing device |
| CN111258442A (en) * | 2018-12-03 | 2020-06-09 | 陕西坤同半导体科技有限公司 | Touch sensing circuit, touch display panel, display device and electronic equipment |
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| CN111399679A (en) * | 2020-03-11 | 2020-07-10 | 北京集创北方科技股份有限公司 | Capacitance detection device |
| TWI737216B (en) * | 2020-03-11 | 2021-08-21 | 大陸商北京集創北方科技股份有限公司 | Self-capacitance detection circuit and information processing device with the capacitance detection circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699380A (en) * | 2009-11-11 | 2010-04-28 | 旭曜科技股份有限公司 | Detection circuit for touch panel and touch panel |
| CN101702109A (en) * | 2009-10-26 | 2010-05-05 | 旭曜科技股份有限公司 | Sensing circuit of capacitive touch panel |
| CN101738765A (en) * | 2008-11-24 | 2010-06-16 | 上海天马微电子有限公司 | Liquid crystal display panel with integrated touch screen, device and touch detection method |
| CN101751193A (en) * | 2010-01-11 | 2010-06-23 | 旭曜科技股份有限公司 | Sensing circuit of capacitance type touch panel |
| US20130314109A1 (en) * | 2009-03-26 | 2013-11-28 | Viktor Kremin | Multi-functional capacitance sensing circuit with a current conveyor |
-
2014
- 2014-01-30 CN CN201410044267.0A patent/CN103902123B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738765A (en) * | 2008-11-24 | 2010-06-16 | 上海天马微电子有限公司 | Liquid crystal display panel with integrated touch screen, device and touch detection method |
| US20130314109A1 (en) * | 2009-03-26 | 2013-11-28 | Viktor Kremin | Multi-functional capacitance sensing circuit with a current conveyor |
| CN101702109A (en) * | 2009-10-26 | 2010-05-05 | 旭曜科技股份有限公司 | Sensing circuit of capacitive touch panel |
| CN101699380A (en) * | 2009-11-11 | 2010-04-28 | 旭曜科技股份有限公司 | Detection circuit for touch panel and touch panel |
| CN101751193A (en) * | 2010-01-11 | 2010-06-23 | 旭曜科技股份有限公司 | Sensing circuit of capacitance type touch panel |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017092676A1 (en) * | 2015-12-02 | 2017-06-08 | 苏州迈瑞微电子有限公司 | Capacitive fingerprint sensor |
| US10628651B2 (en) | 2015-12-02 | 2020-04-21 | Microarray Microelectronics Corp., Ltd | Capacitive fingerprint sensor |
| US10990215B2 (en) | 2015-12-31 | 2021-04-27 | Shenzhen GOODIX Technology Co., Ltd. | Integrating circuit and capacitance sensing circuit |
| WO2017114514A1 (en) * | 2015-12-31 | 2017-07-06 | 深圳市汇顶科技股份有限公司 | Integrating circuit and capacitance sensing circuit |
| CN107615226A (en) * | 2015-12-31 | 2018-01-19 | 深圳市汇顶科技股份有限公司 | Integrating circuit and capacitance sensing circuit |
| CN107615226B (en) * | 2015-12-31 | 2021-06-04 | 深圳市汇顶科技股份有限公司 | Integrating circuit and capacitance sensing circuit |
| CN106598370A (en) * | 2017-01-19 | 2017-04-26 | 北京集创北方科技股份有限公司 | Touch detection circuit and touch device thereof |
| CN106598370B (en) * | 2017-01-19 | 2024-03-15 | 北京集创北方科技股份有限公司 | Touch detection circuit and touch control device thereof |
| CN109510601A (en) * | 2017-09-14 | 2019-03-22 | 深圳指芯智能科技有限公司 | Switching capacity subtraction circuit and sensor device |
| CN109510601B (en) * | 2017-09-14 | 2024-06-07 | 江西指芯智能科技有限公司 | Switched capacitor subtracting circuit and sensor device |
| CN107980115A (en) * | 2017-11-08 | 2018-05-01 | 深圳市汇顶科技股份有限公司 | Capacitance detecting device, touch device and terminal device |
| US10627972B2 (en) | 2017-11-08 | 2020-04-21 | Shenzhen GOODIX Technology Co., Ltd. | Capacitance detecting device, touch device and terminal device |
| CN111258442A (en) * | 2018-12-03 | 2020-06-09 | 陕西坤同半导体科技有限公司 | Touch sensing circuit, touch display panel, display device and electronic equipment |
| TWI693545B (en) * | 2019-04-26 | 2020-05-11 | 大陸商北京集創北方科技股份有限公司 | Touch chip, touch display device and information processing device |
| CN111399679A (en) * | 2020-03-11 | 2020-07-10 | 北京集创北方科技股份有限公司 | Capacitance detection device |
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| US12092671B2 (en) | 2020-03-11 | 2024-09-17 | Chipone Technology (Beijing) Co., Ltd. | Capacitance measurement apparatus |
| CN111289805A (en) * | 2020-03-23 | 2020-06-16 | 深圳市汇顶科技股份有限公司 | Measuring circuit |
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