CN101751193B - Sensing circuit of capacitance type touch panel - Google Patents
Sensing circuit of capacitance type touch panel Download PDFInfo
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- CN101751193B CN101751193B CN2010100020986A CN201010002098A CN101751193B CN 101751193 B CN101751193 B CN 101751193B CN 2010100020986 A CN2010100020986 A CN 2010100020986A CN 201010002098 A CN201010002098 A CN 201010002098A CN 101751193 B CN101751193 B CN 101751193B
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Abstract
The invention relates to a sensing circuit of capacitance type touch panel, comprising a first switch, a second switch, a third switch, a feedback capacitor, a fourth switch and a computing amplifier; the first switch is provided with a first end to be connected to a receiving electrode of the capacitance type touch panel; the second switch is provided with a first end to be connected to the receiving electrode of the capacitance type touch panel; the third switch is provided with a first end to be connected to a second end of the first switch; the feedback capacitor is provided with a first end to be connected to a second end of the first switch; the fourth switch is provided with a first end to be connected to a second end of the feedback capacitor; the computing amplifier is provided with a positive input end to be connected to a grounding end, a negative input end to be connected to the first end of the fourth switch, and an output end to be connected to the second ends of the second switch, the third switch and the fourth switch, driving signals can be used for controlling the act sequence of the above switches in driving period, so that the computing amplifier can generate output voltage. The invention can cause SNR to increase, and vastly improve sensing capability of touch panel.
Description
Technical field
The present invention relates to the sensing circuit of a kind of contact panel (touch panel), and be particularly related to the sensing circuit of a kind of capacitance type touch-control panel (capacitive touch panel).
Background technology
Please refer to Fig. 1, it is shown to be known capacitance type touch-control panel system schematic.The capacitance type touch-control panel system comprises: driver element (driving unit) u1～u6, sensing circuit (sensing circuit) s1～s6 and a contact panel.Wherein, comprise not contacted drive electrode (drivenelectrode) d1～d6 and receiving electrode (receiving electrode) r1～r6 on the touch panel, and each drive electrode d1～d6 is connected to corresponding driver element u1～u6 output terminal, and each receiving electrode r1～r6 is connected to corresponding sensing circuit s1～s6 input end.Moreover the drive electrode d1～d6 that is not in contact with one another and receiving electrode r1～r6 can produce mutual capacitance (mutual capacitance) Cs11～Cs66.Certainly, the capacitance type touch-control panel of Fig. 1 is an example with six drive electrode d1～d6 and six receiving electrode r1～r6 only, and its structure of capacitance type touch-control panel that more drive electrode and receiving electrode are formed is also similar, therefore repeats no more.
The capacitance type touch-control panel of Fig. 1 can be used as the contact panel of multi-point touch (multi-finger).Its principle of operation is to utilize the numerical value of mutual capacitance (capacitance) to change, and calculates user institute position contacting.In general, when the user produced a contact point (touch point) on capacitance type touch-control panel, the mutual capacitance numerical value (capacitance) at contacting points position place can change, at this moment, provide a drive signal to this mutual capacitance, the quantity of electric charge of its charging can corresponding change.And sensing circuit promptly utilizes this characteristic to detect the change of the quantity of electric charge, judges the size variation of Inductance and Capacitance by the variation of voltage signal, and the size variation by Inductance and Capacitance judges whether that earth conductor comes close to or in contact with the position of contact panel again.Certainly, because the pass between the quantity of electric charge (Q), voltage (V) and the capacitance (C) is Q=C * V, therefore, sensing circuit also can provide the change of voltage, makes subsequent conditioning circuit decide the position of user's contact point according to the change amount of voltage.
As shown in Figure 1, six drive signal P1～P6 can provide a pulse (pulse) in regular turn, are passed to drive electrode d1～d6 via driver element u1～u6.Owing to have mutual capacitance Cs11～Cs66 between drive electrode d1～d6 and the receiving electrode r1～r6, the induced charge amount on mutual capacitance Cs11～Cs66 (coupling charge) can be passed to corresponding sensing circuit s1～s6 via receiving electrode r1～r6.Therefore, sensing circuit s1～s6 can produce corresponding output voltage Vo1～Vo6.
With the first drive signal P1 is example, the pulse meeting that produces in a drive cycle T is charged to the mutual inductance Cs11～Cs16 on the first drive electrode d1, induced charge on the Cs11～Cs16 of mutual inductance simultaneously can be passed to sensing circuit s1～s6 via receiving electrode r1～r6, makes sensing circuit s1～s6 can produce corresponding output voltage Vo1～Vo6.
Therefore, when supposing that contact point is positioned near the mutual inductance Cs11, the output voltage V o1 of the first sensing circuit s1 can differ from output voltage V o2～Vo6 of other sensing circuits s2～s6.Certainly, if when two contact points are positioned near mutual inductance Cs11 and the mutual inductance Cs16, output voltage V o1, the Vo6 of the first sensing circuit s1 and 6th sense slowdown monitoring circuit s6 can differ from output voltage V o2～Vo5 of other sensing circuits s2～s5.
Utilize identical principle, in follow-up drive cycle, drive signal P2～P6 can provide pulse to drive electrode d2～d6 in regular turn, makes sensing circuit s1～s6 produce corresponding output voltage Vo1～Vo6.
From the above, six drive cycles can be considered a scan period (scanning cycle, τ).That is to say that after a scan period τ, zones all on the capacitance type touch-control panel all can be scanned (scan) once, and the position of the contact point that the user is produced can correct acquisition on contact panel.
Please refer to Fig. 2, it is shown to be known sensing circuit.Sensing circuit s utilizes an integrator (integrator) to realize, comprising: and operational amplifier (operation amplifier) 200, one feedback capacity (feedback capacitance, Cf).Wherein, the positive input terminal (+) of operational amplifier 200 receives a reference voltage Vref, is connected feedback capacity Cf between negative input end (-) and the output end vo.Moreover the negative input end (-) of operational amplifier 200 also is connected to receiving electrode r, and is connected mutual capacitance Cs between receiving electrode r and the drive electrode d.
And Δ Vo=-Vy * Cs/Cf----(I).Therefore, be example with the first drive signal P1 of Fig. 1, when the user did not produce contact point, mutual capacitance Cs11～Cs16 can not change, and then the voltage variety on sensing circuit s1～s6 output end vo 1～Vo6 can be identical.Otherwise, when supposing that contact point that the user produces is positioned near the mutual inductance Cs11, the numerical value of mutual inductance Cs11 (capacitance) can change, and makes the voltage variety of the sensing circuit s1 output end vo 1 of winning differ from the voltage variety of other sensing circuits s2～s6 output end vo 2～Vo6.And the position that follow-up circuit can be learnt contact point according to the voltage variety on sensing circuit s1～s6 output end vo 1～Vo6.
Yet, when the variation of the mutual capacitance Cs on the contact point is very little, the induced charge amount difference of its induced charge amount and other mutual capacitance is too little, thereby will cause the voltage variety difference of the voltage variety that sensing circuit produced of contact point correspondence and other sensing circuits too little, make subsequent conditioning circuit can't calculate the position of contact point according to this.
Please refer to Fig. 3, it is shown to be known another capacitance type touch-control panel system schematic.As can be known, drive signal P1～P6 comprises two subcycles (t1, t2) in a drive cycle in Fig. 3, makes that the mutual capacitance in the capacitance type touch-control panel 300 can repeatedly produce induced charge.Therefore, the sensing circuit s1～s6 of process design can repeatedly accumulate the induced charge in the mutual capacitance, makes output voltage V o1～Vo6 generation voltage variety of sensing circuit s1～s6 to differentiate by easier quilt.
As shown in Figure 3, six drive cycle T are arranged among the scan period τ, and in a drive cycle two subcycle t1, t2 are arranged.That is to say that each drive signal P1～P6 respectively produces a pulse in each drive cycle T two subcycle t1, t2, makes mutual capacitance repeatedly produce induced charge.And the induced charge that mutual capacitance produces can be repeatedly accumulated in the design of sensing circuit s1～s6, and produces bigger voltage variety.Therefore, after a scan period τ, zones all on the capacitance type touch-control panel all can be scanned (scan) once, and the position of the contact point that the user is produced on contact panel can correct acquisition.
It is example that Fig. 3 only provides two pulses with two subcycle t1, t2 among the drive cycle T, can certainly comprise more subcycle in a drive cycle T and produce more pulse, makes sensing circuit s1～s6 produce bigger voltage variety.And United States Patent (USP) number US6452514 discloses a kind of capacitance sensor and array (Capacitive sensor and array), and it utilizes a plurality of pulses to accumulate the electric charge that mutual capacitance produces.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the present invention proposes a kind of sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode is in order to receive a drive signal, and this sensing circuit comprises: one first switch, and it has one first end in order to be connected to this receiving electrode; One second switch, it has one first end in order to be connected to this receiving electrode; One the 3rd switch, it has one first end in order to be connected to one second end of this first switch; One feedback capacity, it has one first end in order to be connected to this second end of this first switch; One the 4th switch, it has one first end in order to be connected to one second end of this feedback capacity; An and operational amplifier, it has a positive input terminal in order to be connected to an earth terminal, one negative input end is connected to this first end of the 4th switch, and one output terminal be connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch, wherein, this drive signal comprises N subcycle in a drive cycle, common property is given birth to N pulse, N is a positive integer, and each subcycle all comprises a high level time and a low level time, and when this high level time, this first switch and the 4th switch are a closed condition, and this second switch and the 3rd switch are an open-circuit condition, when this low level time, this first switch and the 4th switch are this open-circuit condition, and this second switch and the 3rd switch are this closed condition, and then feasible this low level time that is arranged in this N subcycle, this output terminal of this operational amplifier produces an output voltage.
The present invention also proposes a kind of sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode can receive a drive signal, this sensing circuit comprises: one first switch, and it has one first end in order to be connected to this receiving electrode; One second switch, it has one first end in order to be connected to this receiving electrode; One the 3rd switch, it has one first end in order to be connected to one second end of this first switch; One feedback capacity, it has one first end in order to be connected to this second end of this first switch; One the 4th switch, it has one first end in order to be connected to one second end of this feedback capacity; An and operational amplifier, it has a positive input terminal in order to be connected to an earth terminal, one negative input end is connected to this first end of the 4th switch, and one output terminal be connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch, wherein, this drive signal has N subcycle in a drive cycle, N is a positive integer, this N subcycle comprises one first phase place respectively, one second phase place, one third phase position and one the 4th phase place, when being this first phase place, this drive signal is a floating, this first switch and this second switch are an open-circuit condition, the 3rd switch and the 4th switch are a closed condition, when in this second phase place, this drive signal is a low level, this first switch and the 4th switch are this closed condition, this second switch and the 3rd switch are this open-circuit condition, when in this third phase position, this drive signal is a high level, this first switch and the 4th switch are this closed condition, this second switch and the 3rd switch are this open-circuit condition, and, when in the 4th phase place, this drive signal is this low level, and this first switch and the 4th switch are this open-circuit condition, and this second switch and the 3rd switch are this closed condition, and then when making the 4th phase place in aforementioned N subcycle, this output terminal of this operational amplifier produces an output voltage.
The present invention also proposes a kind of sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode is connected to an earth terminal, this sensing circuit comprises: one first switch, and it has one first end in order to be connected to this receiving electrode; One second switch, it has one first end in order to be connected to this receiving electrode; One the 3rd switch, it has one first end in order to be connected to one second end of this first switch; One feedback capacity, it has one first end in order to be connected to this second end of this first switch; One the 4th switch; One operational amplifier, it has a positive input terminal in order to be connected to this earth terminal, and a negative input end is connected to one first end of the 4th switch, and an output terminal is connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch; One the 5th switch, it has one first end in order to be connected to a voltage source, and one second end is connected to one second end of this feedback capacity; And one the 6th switch, it has this second end that first end is connected to this feedback capacity, one second end is connected to this first end of the 4th switch, wherein, one drive cycle has N subcycle, N is a positive integer, this N sub-cycle comprises one first phase place and one second phase place, when in this first phase place, this first switch, the 4th switch and the 5th switch are a closed condition, this second switch and the 3rd switch and the 6th switch are an open-circuit condition, and, when in second phase place, this first switch, the 4th switch and the 5th switch are this open-circuit condition, this second switch, the 3rd switch and the 6th switch are this closed condition, and then when making aforementioned this second phase place that is arranged in N subcycle, this output terminal of this operational amplifier produces an output voltage.
The invention has the advantages that the sensing circuit that proposes a kind of capacitance type touch-control panel, it can produce bigger voltage variety in output terminal, therefore can make that signal to noise ratio (snr) improves, subsequent conditioning circuit can carry out the calculating of contacting points position easily according to the output voltage of sensing circuit, significantly promote the sensing function of contact panel.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited.
Description of drawings
Shown in Figure 1ly go out to be known capacitance type touch-control panel system schematic.
Shown in Figure 2ly go out to be known sensing circuit.
Shown in Figure 3ly go out to be known another capacitance type touch-control panel system schematic.
Shown first embodiment of Fig. 4 A and Fig. 4 B for sensing circuit of the present invention and control signal thereof.
Fig. 5 A to Fig. 5 G is shown to be the action synoptic diagram of first embodiment.
Shown second embodiment of Fig. 6 A and Fig. 6 B for sensing circuit of the present invention and control signal thereof.
Fig. 7 A to Fig. 7 M is shown to be the action synoptic diagram of second embodiment.
Shown the 3rd embodiment of Fig. 8 A and Fig. 8 B for sensing circuit of the present invention and control signal thereof.
Fig. 9 A to Fig. 9 G is shown to be the action synoptic diagram of the 3rd embodiment.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
200 operational amplifiers, 300 capacitance type touch-control panels
400,600,800 operational amplifiers
Embodiment
Please refer to Fig. 4 A and Fig. 4 B, its shown first embodiment for sensing circuit of the present invention and control signal thereof.Sensing circuit s comprises: an operational amplifier 400, a feedback capacity Cf, four on-off circuit sw1～sw4.Moreover drive signal P can produce induced charge at mutual capacitance Cs via drive electrode d, and is sent to the input end of sensor circuit s via receiving electrode r.
Wherein, sensing circuit s input end is connected to first end of first switch sw1 (being controlled by the first control signal ctr1) and second switch sw2 (being controlled by the second control signal ctr2), and second end of the first switch sw1 is connected to first end of the 3rd switch sw3 (being controlled by the 3rd control signal ctr3) and feedback capacity Cf; The negative input end (-) of operational amplifier 400 connects second end of feedback capacity Cf and first end of the 4th switch sw4 (being controlled by the 4th control signal ctr4), the positive input terminal (+) of operational amplifier 400 is connected to an earth terminal (GND), the output terminal of operational amplifier 400 is the output end vo of sensing circuit s, and is connected to second end of second switch sw2, the 3rd switch sw3, the 4th switch sw4.
Moreover, by Fig. 4 B as can be known, drive signal P in a scan period, comprise reset cycle (resetcycle) and drive cycle (driving cycle, T).Wherein, comprise three subcycle t1, t2, t3 among the drive cycle T of drive signal P, common property is given birth to three pulses, and other times are the reset cycle.Moreover four control signal ctr1～ctr4 can make switch sw1～sw4 for closing (close) state when high level, can make switch sw1～sw4 be open circuit (open) state when low level.Be example with three pulses only among Fig. 4 B, in fact subcycle and the pulse number among the drive cycle T do not limit.
Below introduce the detailed operation situation of the first embodiment sensing circuit s in detail.Please refer to Fig. 5 A, the sensing circuit synoptic diagram that it is shown when being the reset cycle.When the reset cycle, the first switch sw1 to the, four switch sw4 are closed condition.At this moment, drive signal P does not produce pulse as yet, and the two-end-point short circuit of feedback capacity Cf and mutual capacitance Cs (short circuit), so the quantity of electric charge is 0.And operational amplifier 400 connects into a unity gain amplifier (unit gain amplifier), so output end vo voltage is 0
Please refer to Fig. 5 B, it is shown to be the sensing circuit synoptic diagram of the high level time t1a of the first subcycle t1 among the drive cycle T.By Fig. 4 B as can be known, when the first subcycle t1 high level time t1a, the first switch sw1, the 4th switch sw4 are closed condition, and second switch sw2, the 3rd switch sw3 are open-circuit condition.
At this moment, operational amplifier 400 connects into a unity gain amplifier, so output end vo voltage is 0.And the pulse-response amplitude of drive signal P is Vy, so the voltage on the feedback capacity Cf is
Please refer to Fig. 5 C, it is shown to be the sensing circuit synoptic diagram of the low level time t1b of the first subcycle t1 among the drive cycle T.By Fig. 4 B as can be known, when the first subcycle t1 low level time t1b, second switch sw2, the 3rd switch sw3 are closed condition, and the first switch sw1, the 4th switch sw4 are open-circuit condition.
At this moment, operational amplifier 400 output end vo voltages are
Because the voltage of drive signal P is 0, therefore, the voltage on the mutual capacitance Cs also is V1.So the last charge stored of mutual capacitance Cs is Cs * V1, and the last charge stored of feedback capacity Cf is Cf * V1.
Please refer to Fig. 5 D, it is shown to be the sensing circuit synoptic diagram of the high level time t2a of the second subcycle t2 among the drive cycle T.By Fig. 4 B as can be known, when the second subcycle t2 high level time t2a, the first switch sw1, the 4th switch sw4 are closed condition, and second switch sw2, the 3rd switch sw3 are open-circuit condition.
At this moment, operational amplifier 400 connects into a unity gain amplifier, and output end vo voltage is 0.And the pulse-response amplitude of drive signal P is Vy, and the voltage on the hypothesis feedback capacity Cf is V2.Therefore, Cs * V1+Cf * V1=(V2-Vy) Cs+V2 * Cf.
Please refer to Fig. 5 E, it is shown to be the sensing circuit synoptic diagram of the low level time t2b of the second subcycle t2 among the drive cycle T.By Fig. 4 B as can be known, when the second subcycle t2 low level time t2b, second switch sw2, the 3rd switch sw3 are closed condition, and the first switch sw1, the 4th switch sw4 are open-circuit condition.
Please refer to Fig. 5 F, it is shown to be the sensing circuit synoptic diagram of the high level time t3a of the 3rd subcycle t3 among the drive cycle T.By Fig. 4 B as can be known, when the 3rd subcycle t3 high level time t3a, the first switch sw1, the 4th switch sw4 are closed condition, and second switch sw2, the 3rd switch sw3 are open-circuit condition.
At this moment, operational amplifier 400 connects into a unity gain amplifier, and output end vo voltage is 0.And the pulse-response amplitude of drive signal P is Vy, and the voltage on the hypothesis feedback capacity Cf is V3.Therefore, Cs * V2+Cf * V2=(V3-Vy) Cs+V3 * Cf.
Please refer to Fig. 5 G, it is shown to be the sensing circuit synoptic diagram of the low level time t3b of the 3rd subcycle t3 among the drive cycle T.By Fig. 4 B as can be known, when the 3rd subcycle t3 low level time t3b, second switch sw2, the 3rd switch sw3 are closed condition, and the first switch sw1, the 4th switch sw4 are open-circuit condition.
By the first embodiment of the present invention as can be known, when drive cycle T neutron number of cycles was N pulse, when the high level of pulse, electric charge can accumulate on feedback capacity Cf with a fixed qty.And when the low level of N pulse, the output voltage that can obtain on the sensing circuit s output end vo is
Therefore, the reference that can judge according to output voltage of subsequent conditioning circuit.
Please refer to Fig. 6 A and Fig. 6 B, its shown second embodiment for sensing circuit of the present invention and control signal thereof.Sensing circuit s comprises: an operational amplifier 600, a feedback capacity Cf, four on-off circuit sw1～sw4.Moreover drive signal P switches the 5th switch sw5 (being controlled by the 5th control signal ctr5) and produces with the 6th switch sw6 (being controlled by the 6th control signal ctr6).
Wherein, sensing circuit s input end is connected to first end of first switch sw1 (being controlled by the first control signal ctr1) and second switch sw2 (being controlled by the second control signal ctr2), and the first switch sw1, second end is connected to the 3rd switch sw3 (being controlled by the 3rd control signal ctr3) and feedback capacity Cf first end; The negative input end (-) of operational amplifier 600 connects second end of feedback capacity Cf and first end of the 4th switch sw4 (being controlled by the 4th control signal ctr4), the positive input terminal (+) of operational amplifier 600 is connected to an earth terminal (GND), the output terminal of operational amplifier 600 is the output end vo of sensing circuit s, and is connected to second end of second switch sw2, the 3rd switch sw3, the 4th switch sw4.
Moreover six control signal ctr1～ctr6 can make switch sw1～sw6 for closing (close) state when high level, can make switch sw1～sw6 be open circuit (open) state when low level.By Fig. 6 B as can be known, drive signal P comprises a reset cycle and a drive cycle T in a scan period.Moreover drive signal P produces three subcycle t1, t2, t3 in a drive cycle T, and each son week is comprising four phase places (phase).With the first subcycle t1 is example, and when the first phase place t1a, the 5th switch sw5 and the 6th switch sw6 are open-circuit condition simultaneously, and drive signal is floating (floating); During the second phase place t1b, the 5th switch sw5 is that open-circuit condition and the 6th switch sw6 are closed condition, and drive signal P is low level (0V); During the t1c of third phase position, the 5th switch sw5 is that closed condition and the 6th switch sw6 are open-circuit condition, and drive signal P is high level Vy; And during the 4th phase place t1d, the 5th switch sw5 is that open-circuit condition and the 6th switch sw6 are closed condition, and drive signal P is low level (0V).And the other times beyond the drive cycle T are the reset cycle.Be example with three subcycles only among Fig. 6 B, in fact the subcycle number among the drive cycle T does not limit.
Below introduce the detailed operation situation of the second embodiment sensing circuit s in detail.Please refer to Fig. 7 A, the sensing circuit synoptic diagram that it is shown when being the reset cycle.When the reset cycle, the first switch sw1 to the, four switch sw4 are closed condition.Moreover the 5th switch sw5 is an open-circuit condition, and the 6th switch sw6 is a closed condition, and drive signal P is low level (0V), and the two-end-point short circuit of feedback capacity Cf and mutual capacitance Cs (short circuit), so the quantity of electric charge is 0.And operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 B, it is shown to be the sensing circuit synoptic diagram of the first phase place t1a of the first subcycle t1 among the drive cycle T.By Fig. 6 B as can be known, when the first phase place t1a of the first subcycle t1, the first switch sw1 and second switch sw2 are open-circuit condition, and the 3rd switch sw3 and the 4th switch sw4 are closed condition, and drive signal P is a floating.At this moment, the last two end points short circuits of feedback capacity Cf make that the quantity of electric charge is 0, and operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 C, it is shown to be the sensing circuit synoptic diagram of the second phase place t1b of the first subcycle t1 among the drive cycle T.By Fig. 6 B as can be known, when the second phase place t1b of the first subcycle t1, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is low level (0V).At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and be connected to earth terminal, and operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 D, it is shown to be the sensing circuit synoptic diagram of the third phase position t1c of the first subcycle t1 among the drive cycle T.By Fig. 6 B as can be known, when the t1c of the third phase position of the first subcycle t1, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is high level Vy.At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and be connected to high level Vy makes voltage on the feedback capacity Cf.And operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 E, it is shown to be the sensing circuit synoptic diagram of the 4th phase place t1d of the first subcycle t1 among the drive cycle T.By Fig. 6 B as can be known, when the 4th phase place t1d of the first subcycle t1, the first switch sw1 and the 4th switch sw4 are open-circuit condition, and second switch sw2 and the 3rd switch sw3 are closed condition, and drive signal P is low level (0V).At this moment, operational amplifier 600 output end vo voltages are
Simultaneously, the voltage on the mutual capacitance Cs also is V1.So it is Cs * V1 that mutual capacitance Cs goes up charge stored; And the last charge stored of feedback capacity Cf is Cf * V1.
Please refer to Fig. 7 F, it is shown to be the sensing circuit synoptic diagram of the first phase place t2a of the second subcycle t2 among the drive cycle T.By Fig. 6 B as can be known, when the first phase place t2a of the second subcycle t2, the first switch sw1 and second switch sw2 are open-circuit condition, and the 3rd switch sw3 and the 4th switch sw4 are closed condition, and drive signal P is a floating.At this moment, the last two end points short circuits of feedback capacity Cf make that the quantity of electric charge is 0, and the constant (Cs * V1), and operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0 of the quantity of electric charge on the mutual capacitance Cs.
Please refer to Fig. 7 G, it is shown to be the sensing circuit synoptic diagram of the second phase place t2b of the second subcycle t2 among the drive cycle T.By Fig. 6 B as can be known, when the second phase place t2b of the second subcycle t2, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is low level (0V).At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and be connected to earth terminal, therefore, the quantity of electric charge summation on feedback capacity Cf and the mutual capacitance Cs is Cs * V1.And operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 H, it is shown to be the sensing circuit synoptic diagram of the third phase position t2c of the second subcycle t2 among the drive cycle T.By Fig. 6 B as can be known, when the t2c of the third phase position of the second subcycle t2, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is high level Vy.At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and the voltage of hypothesis feedback capacity Cf is changed into V2.Therefore, Cs * V1=(V2-Vy) * Cs+V2 * Cf,
Wherein,
And operational amplifier 600 connects into a unity gain amplifier, so output terminal (Vo) voltage is 0.
Please refer to Fig. 7 I, it is shown to be the sensing circuit synoptic diagram of the 4th phase place t2d of the second subcycle t2 among the drive cycle T.By Fig. 6 B as can be known, when the 4th phase place t2d of the second subcycle t2, the first switch sw1 and the 4th switch sw4 are open-circuit condition, and second switch sw2 and the 3rd switch sw3 are closed condition, and drive signal P is low level (0V).At this moment, operational amplifier 600 output terminals (Vo) voltage is V2=(A
2+ A) Vy simultaneously, the voltage on the mutual capacitance Cs also is V2.So it is Cs * V2 that mutual capacitance Cs goes up charge stored; And the last charge stored of feedback capacity Cf is Cf * V2.
Please refer to Fig. 7 J, it is shown to be the sensing circuit synoptic diagram of the first phase place t3a of the 3rd subcycle t3 among the drive cycle T.By Fig. 6 B as can be known, when the first phase place t3a of the 3rd subcycle t3, the first switch sw1 and second switch sw2 are open-circuit condition, and the 3rd switch sw3 and the 4th switch sw4 are closed condition, and drive signal P is a floating.At this moment, feedback capacity Cf goes up the two-end-point short circuit and makes that the quantity of electric charge is 0, and the constant (Cs * V2), and operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0 of the quantity of electric charge on the mutual capacitance Cs.
Please refer to Fig. 7 K, it is shown to be the sensing circuit synoptic diagram of second phase place (t3b) of the 3rd subcycle t3 among the drive cycle T.By Fig. 6 B as can be known, when second phase place (t3b) of the 3rd subcycle t3, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is low level (0V).At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and be connected to earth terminal, therefore, the amount of congratulating by sending a telegram on the summation on feedback capacity Cf and the mutual capacitance Cs is (Cs * V2).And operational amplifier 600 connects into a unity gain amplifier, so output terminal (Vo) voltage is 0.
Please refer to Fig. 7 L, it is shown to be the sensing circuit synoptic diagram of the third phase position t3c of the 3rd subcycle t3 among the drive cycle T.By Fig. 6 B as can be known, when the t3c of the third phase position of the 3rd subcycle t3, the first switch sw1 and the 4th switch sw4 are closed condition, and second switch sw2 and the 3rd switch sw3 are open-circuit condition, and drive signal P is high level Vy.At this moment, feedback capacity Cf and mutual capacitance Cs polyphone, and the voltage of hypothesis feedback capacity Cf is changed into V3.Therefore, Cs * V2=(V3-Vy) * Cs+V3 * Cf,
Wherein,
And operational amplifier 600 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 7 M, it is shown to be the sensing circuit synoptic diagram of the 4th phase place t3d of the 3rd subcycle t3 among the drive cycle T.By Fig. 6 B as can be known, when the 4th phase place t3d of the 3rd subcycle t3, the first switch sw1 and the 4th switch sw4 are open-circuit condition, and second switch sw2 and the 3rd switch sw3 are closed condition, and drive signal P is low level (0V).At this moment, operational amplifier 600 output end vo voltages are V3=(A
3+ A
2+ A) Vy simultaneously, the voltage on the mutual capacitance Cs also is V3.So it is Cs * V3 that mutual capacitance Cs goes up charge stored; And the last charge stored of feedback capacity Cf is Cf * V3.That is to say, when the 4th phase place t3d of the 3rd pulse t3, can obtain output voltage in the output end vo of sensing circuit s.
By the second embodiment of the present invention as can be known, when drive cycle T neutron number of cycles was N, when the third phase position of subcycle, electric charge can accumulate on feedback capacity Cf.And when the 4th phase place of N subcycle, the output voltage that can obtain on the sensing circuit s output end vo is
Wherein,
Therefore, subsequent conditioning circuit can be judged according to output voltage.
Please refer to Fig. 8 A and Fig. 8 B, its shown the 3rd embodiment for sensing circuit of the present invention and control signal thereof.Sensing circuit s comprises: an operational amplifier 800, a feedback capacity Cf, six on-off circuit sw1～sw6.Moreover drive electrode d is connected directly to earth terminal, and receiving electrode r is connected to the input end of sensing circuit s.
Wherein, sensing circuit s input end is connected to first end of first switch sw1 (being controlled by the first control signal ctr1) and second switch sw2 (being controlled by the second control signal ctr2), and the first switch sw1, second end is connected to the 3rd switch sw3 (being controlled by the 3rd control signal ctr3) and feedback capacity Cf first end; The 5th switch (being controlled by the 5th control signal ctr5) first termination is received Vy voltage, and second end is connected to first end of feedback capacity Cf second end and the 6th switch (being controlled by the 6th control signal ctr6); The negative input end (-) of operational amplifier 800 connects second end of the 6th switch sw6 and first end of the 4th switch sw4 (being controlled by the 4th control signal ctr4), the positive input terminal (+) of operational amplifier 800 is connected to an earth terminal (GND), the output terminal of operational amplifier 800 is the output end vo of sensing circuit s, and is connected to second end of second switch sw2, the 3rd switch sw3, the 4th switch sw4.
Moreover six control signal ctr1～ctr6 can make that when high level switch sw1～sw6 is a closed condition, can make that when low level switch sw1～sw6 is an open-circuit condition.By Fig. 8 B as can be known, according to the 5th control signal ctr5 and the 6th control signal ctr6, a scan period can be divided into: a reset cycle and a drive cycle T.Divide into three subcycle t1, t2, t3 among the drive cycle T, each subcycle comprises one first phase place and one second phase place respectively.With the first pulse t1 is example, and during the first phase place t1a, the 5th switch sw5 is a closed condition, and the 6th switch sw6 is an open-circuit condition; During the second phase place t1b, the 5th switch sw5 is an open-circuit condition, and the 6th switch sw6 is a closed condition.Be example with three subcycles only among Fig. 8 B, in fact the subcycle number among the drive cycle T does not limit.
Below introduce the detailed operation situation of the 3rd embodiment sensing circuit s in detail.Please refer to Fig. 9 A, the sensing circuit synoptic diagram that it is shown when being the reset cycle.When the reset cycle, it is open-circuit condition that the 5th switch sw5 is only arranged, and the first switch sw1 to the, four switch sw4 and the 6th switch sw6 are closed condition.Therefore, the two end points short circuits of feedback capacity Cf and mutual capacitance Cs, so the quantity of electric charge is 0.And operational amplifier 800 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 9 B, it is shown to be the sensing circuit synoptic diagram of the first phase place t1a of the first subcycle t1 among the drive cycle T.By Fig. 8 B as can be known, when the first phase place t1a of the first subcycle t1, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are closed condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are open-circuit condition.At this moment, the voltage on the feedback capacity Cf is
And operational amplifier 800 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 9 C, it is shown to be the sensing circuit synoptic diagram of the second phase place t1b of the first subcycle t1 among the drive cycle T.By Fig. 8 B as can be known, when the second phase place t1b of the first subcycle t1, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are open-circuit condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are closed condition.At this moment, operational amplifier 800 output end voltages
Voltage in the mutual capacitance simultaneously also is V1.So the last charge stored of mutual capacitance Cs is Cs * V1, and and the last charge stored of feedback capacity Cf is Cf * V1.
Please refer to Fig. 9 D, it is shown to be the sensing circuit synoptic diagram of the first phase place t2a of the second subcycle t2 among the drive cycle T.By Fig. 8 B as can be known, when the first phase place t2a of the second subcycle t2, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are closed condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are open-circuit condition.At this moment, the voltage of supposing feedback capacity Cf is changed into V2.Therefore, (Cf+Cs) * V1=(V2-Vy) * Cs+V2 * Cf,
And operational amplifier 800 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 9 E, it is shown to be the sensing circuit synoptic diagram of the second phase place t2b of the second subcycle t2 among the drive cycle T.By Fig. 8 B as can be known, when the second phase place t2b of the second subcycle t2, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are open-circuit condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are closed condition.At this moment, operational amplifier 800 output end voltages
Voltage in the mutual capacitance simultaneously also is V2.So it is Cs * V2 that mutual capacitance Cs goes up charge stored; And the last charge stored of feedback capacity Cf is Cf * V2.
Please refer to Fig. 9 F, it is shown to be the sensing circuit synoptic diagram of the first phase place t3a of the 3rd subcycle t3 among the drive cycle T.By Fig. 8 B as can be known, when the first phase place t3a of the 3rd subcycle t3, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are closed condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are open-circuit condition.At this moment, the voltage of supposing feedback capacity Cf is changed into V3.Therefore, (Cf+Cs) * V2=(V3-Vy) * Cs+V3 * Cf,
And operational amplifier 800 connects into a unity gain amplifier, so output end vo voltage is 0.
Please refer to Fig. 9 G, it is shown to be the sensing circuit synoptic diagram of the second phase place t3b of the 3rd subcycle t3 among the drive cycle T.By Fig. 8 B as can be known, when the second phase place t3b of the 3rd subcycle t3, the first switch sw1, the 4th switch sw4 and the 5th switch sw5 are open-circuit condition, and second switch sw2, the 3rd switch sw3 and the 6th switch sw6 are closed condition.At this moment, operational amplifier 800 output end voltages
Voltage in the mutual capacitance simultaneously also is V3.
By the third embodiment of the present invention as can be known, when drive cycle T neutron number of cycles was N, when first phase place, electric charge can accumulate on feedback capacity Cf.And when second phase place of N pulse, the output voltage that can obtain on the sensing circuit s output end vo is
Therefore, subsequent conditioning circuit can be judged according to output voltage.
According to embodiments of the invention, when drive cycle, the voltage that is produced on the output terminal of sensing circuit s can become big, therefore subsequent conditioning circuit can be distinguished easily and have point of contact and the voltage variety when not having contact point, and judicious contacting points position, the susceptibility (sensitivity) of raising contact panel.
The invention has the advantages that the sensing circuit that proposes a kind of capacitance type touch-control panel, it can produce bigger voltage variety in output terminal, therefore can make that signal to noise ratio (snr) improves, subsequent conditioning circuit can carry out the calculating of contacting points position easily according to the output voltage of sensing circuit, significantly promote the sensing function of contact panel.
In sum; though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; any ordinary skill people; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (13)
1. sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode is in order to receive a drive signal, and this sensing circuit comprises:
One first switch, it has one first end in order to be connected to this receiving electrode;
One second switch, it has one first end in order to be connected to this receiving electrode;
One the 3rd switch, it has one first end in order to be connected to one second end of this first switch;
One feedback capacity, it has one first end in order to be connected to this second end of this first switch;
One the 4th switch, it has one first end in order to be connected to one second end of this feedback capacity; And
One operational amplifier, it has a positive input terminal in order to be connected to an earth terminal, and a negative input end is connected to this first end of the 4th switch, and one output terminal be connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch
Wherein, this drive signal comprises N subcycle in a drive cycle, common property is given birth to N pulse, N is a positive integer, and each subcycle all comprises a high level time and a low level time, when this high level time, this first switch and the 4th switch are a closed condition, and this second switch and the 3rd switch are an open-circuit condition, when this low level time, this first switch and the 4th switch are this open-circuit condition, and this second switch and the 3rd switch are this closed condition, and then feasible this low level time that is arranged in this N subcycle, this output terminal of this operational amplifier produces an output voltage.
2. sensing circuit as claimed in claim 1, wherein this drive signal comprises this drive cycle and a reset cycle.
3. sensing circuit as claimed in claim 2 wherein when this reset cycle, in order to control this first switch, this second switch, the 3rd switch, to be this closed condition with the 4th switch, makes that the electric charge in this feedback capacity and this mutual capacitance is 0.
4. sensing circuit as claimed in claim 1, wherein, this output voltage is
The capacitance of central this mutual capacitance is Cs, and the capacitance of this feedback capacity is Cf, and the amplitude of this N pulse is respectively Vy.
5. sensing circuit as claimed in claim 4, the N that this low level this output voltage in this N subcycle is this low level this output voltage in this first subcycle are doubly.
6. sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode can receive a drive signal, and this sensing circuit comprises:
One first switch, it has one first end in order to be connected to this receiving electrode;
One second switch, it has one first end in order to be connected to this receiving electrode;
One the 3rd switch, it has one first end in order to be connected to one second end of this first switch;
One feedback capacity, it has one first end in order to be connected to this second end of this first switch;
One the 4th switch, it has one first end in order to be connected to one second end of this feedback capacity; And
One operational amplifier, it has a positive input terminal in order to be connected to an earth terminal, and a negative input end is connected to this first end of the 4th switch, and one output terminal be connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch
Wherein, this drive signal has N subcycle in a drive cycle, N is a positive integer, this N subcycle comprises one first phase place respectively, one second phase place, one third phase position and one the 4th phase place, when being this first phase place, this drive signal is a floating, this first switch and this second switch are an open-circuit condition, the 3rd switch and the 4th switch are a closed condition, when in this second phase place, this drive signal is a low level, this first switch and the 4th switch are this closed condition, this second switch and the 3rd switch are this open-circuit condition, when in this third phase position, this drive signal is a high level, this first switch and the 4th switch are this closed condition, this second switch and the 3rd switch are this open-circuit condition, and, when in the 4th phase place, this drive signal is this low level, and this first switch and the 4th switch are this open-circuit condition, and this second switch and the 3rd switch are this closed condition, and then when making the 4th phase place in aforementioned N subcycle, this output terminal of this operational amplifier produces an output voltage.
7. sensing circuit as claimed in claim 6, wherein this drive signal comprises this drive cycle and a reset cycle.
8. sensing circuit as claimed in claim 7, wherein when this reset cycle, in order to controlling this first switch, this second switch, the 3rd switch, and the 4th switch is this closed condition, makes that the electric charge in this feedback capacity and this mutual capacitance is 0.
9. sensing circuit as claimed in claim 6, wherein, this drive electrode is connected to one first end of one the 5th switch and one first end of one the 6th switch, one second termination of the 5th switch is received this high level, one second termination of the 6th switch is received this low level, when being positioned at this first phase place, the 5th switch and the 6th switch are this open-circuit condition, when in this second phase place, the 6th switch is this closed condition, the 5th switch is this open-circuit condition, when in this third phase position, the 5th switch is this closed condition, the 6th switch is this open-circuit condition, and, when in the 4th phase place, the 6th switch is this closed condition, and the 5th switch is this open-circuit condition.
10. sensing circuit as claimed in claim 6, wherein, this output voltage is
In the middle of,
The capacitance of this mutual capacitance is Cs, and the capacitance of this feedback capacity is Cf, and this high level is Vy.
11. sensing circuit, be applicable to a capacitance type touch-control panel, this sensing circuit is connected in a receiving electrode of this capacitance type touch-control panel, and has a mutual capacitance between a drive electrode of this capacitance type touch-control panel and this receiving electrode, and this drive electrode is connected to an earth terminal, and this sensing circuit comprises:
One first switch, it has one first end in order to be connected to this receiving electrode;
One second switch, it has one first end in order to be connected to this receiving electrode;
One the 3rd switch, it has one first end in order to be connected to one second end of this first switch;
One feedback capacity, it has one first end in order to be connected to this second end of this first switch;
One the 4th switch;
One operational amplifier, it has a positive input terminal in order to be connected to this earth terminal, and a negative input end is connected to one first end of the 4th switch, and an output terminal is connected to one second end of this second switch, one second end of the 3rd switch, and one second end of the 4th switch;
One the 5th switch, it has one first end in order to be connected to a voltage source, and one second end is connected to one second end of this feedback capacity; And
One the 6th switch, it has this second end that first end is connected to this feedback capacity, and one second end is connected to this first end of the 4th switch,
Wherein, one drive cycle has N subcycle, N is a positive integer, this N sub-cycle comprises one first phase place and one second phase place, when in this first phase place, this first switch, the 4th switch and the 5th switch are a closed condition, this second switch and the 3rd switch and the 6th switch are an open-circuit condition, and, when in second phase place, this first switch, the 4th switch and the 5th switch are this open-circuit condition, this second switch, the 3rd switch and the 6th switch are this closed condition, and then when making aforementioned this second phase place that is arranged in N subcycle, this output terminal of this operational amplifier produces an output voltage.
12. sensing circuit as claimed in claim 11, wherein also comprise a reset cycle, in order to control this first switch, this second switch, the 3rd switch, the 4th switch, with the 6th switch be a closed condition, the 5th switch is an open-circuit condition, makes that the electric charge in this feedback capacity and this mutual capacitance is 0.
13. sensing circuit as claimed in claim 11, wherein, this output voltage is
The capacitance of central this mutual capacitance is Cs, and the capacitance of this feedback capacity is Cf, and this voltage source voltage is Vy.
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| JP4927216B1 (en) * | 2010-11-12 | 2012-05-09 | シャープ株式会社 | Linear element array value estimation method, capacitance detection method, integrated circuit, touch sensor system, and electronic device |
| US8665231B2 (en) * | 2010-11-29 | 2014-03-04 | Chimei Innolux Corporation | Sensing methods for touch sensing devices |
| JP5384598B2 (en) | 2011-09-09 | 2014-01-08 | シャープ株式会社 | Capacitive touch sensor panel, capacitive touch sensor system using the same, and information input / output device |
| JP5350437B2 (en) | 2011-06-27 | 2013-11-27 | シャープ株式会社 | Touch sensor system |
| WO2013001920A1 (en) | 2011-06-29 | 2013-01-03 | Sharp Kabushiki Kaisha | Touch sensor system and electronic device |
| KR102008780B1 (en) * | 2012-12-21 | 2019-08-08 | 엘지디스플레이 주식회사 | Display device and driving method thereof |
| CN103902123B (en) * | 2014-01-30 | 2017-04-19 | 敦泰科技有限公司 | Self-capacitance touch sensing device capable of reducing substrate capacitance |
| TWI640912B (en) * | 2016-10-24 | 2018-11-11 | 瑞鼎科技股份有限公司 | Mutual-capacitive touch sensing circuit and noise supressing method applied to mutual-capacitive touch panel |
| JP6960831B2 (en) * | 2017-11-17 | 2021-11-05 | エイブリック株式会社 | Sensor device |
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