CN103576999A - Sensing device of capacitive touch panel - Google Patents
Sensing device of capacitive touch panel Download PDFInfo
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- CN103576999A CN103576999A CN201210256065.3A CN201210256065A CN103576999A CN 103576999 A CN103576999 A CN 103576999A CN 201210256065 A CN201210256065 A CN 201210256065A CN 103576999 A CN103576999 A CN 103576999A
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Abstract
The invention provides a sensing device of a capacitive touch panel. The sensing device is used for sensing the capacitive touch panel and generating a corresponding output signal and comprises a sensing module and a processing module. The sensing module is coupled to the capacitive touch panel and used for providing a driving voltage and a reference voltage for the capacitive touch panel and generating a sensing voltage according to initial capacitance and capacitance. The processing module is coupled to the sensing module and used for performing charging/ discharging on a sensing circuit and generating a corresponding output signal according to the sensing voltage.
Description
Technical field
The present invention relates to a kind of sensing apparatus of capacitance type touch-control panel, particularly a kind of multiple sensing mode and sensing apparatus of the capacitance type touch-control panel of sense capacitance formula contact panel fast integrated.
Background technology
The correlation technique of touch-control sensing significantly promotes in recent years, has in the use great convenience, and therefore contact panel miscellaneous has been widely used in various electronic product.
Contact panel can be categorized as according to its type of drive and structural design the contact panels such as resistance-type, condenser type, electromagnetic type, surface acoustic wave (SAW) formula and infrared ray (IR) formula.Modal two types is electric resistance touch-control panel and capacitance type touch-control panel at present.With electric resistance touch-control panel, user need apply pressure on electric resistance touch-control panel, makes the part region conducting of electric resistance touch-control panel inside and produces corresponding coordinate signal.Yet electric resistance touch-control panel only can carry out sensing for single-point pressure, when being subject to multiple spot and pressing, cannot make accurate judgment.So electric resistance touch-control panel has the restriction in its application and cannot meet consumer for the diversified demand of product function.
With capacitance type touch-control panel, its sensing principle is while touching by sensing human body the electrode that it comprises, can cause static reciprocation and the variable quantity of the equivalent capacitance value that produces carries out the sensing of position of touch, because whole framework and the neither electric resistance touch-control panel that is same as of sensing principle, make capacitance type touch-control panel there is the simultaneously characteristic of multi-point touch, thereby replace electric resistance touch-control panel gradually and become the main flow on market.
But along with user is increasing and to the requirement of touch-control accuracy also under more and more higher development trend to the demand size of capacitance type touch-control panel, the sensing apparatus of capacitance type touch-control panel needs data volume to be processed significantly to increase, also relative increase the needed time of touch-control sensing, cause the sensing usefulness of capacitance type touch-control panel to reduce, do not meet the demand in use, and each different capacitance type touch-control panel is because the capacitance characteristic of itself framework is different, if will correctly complete sensing its corresponding sensing apparatus of must arranging in pairs or groups, according to its capacitance characteristic, come sensing just can reach, for manufacturer, the capacitance type touch-control panel miscellaneous various corresponding sensing apparatus of must arranging in pairs or groups, in manufacture process, can bring great inconvenience.
Therefore, develop a kind of various sensing mode can being integrated in a sensing apparatus, and can complete fast and accurately the sensing apparatus to the capacitance type touch-control panel of the sensor operation of capacitance type touch-control panel, be numerous manufacturers and user desired, and become the important topic on the sensing apparatus development and application of capacitance type touch-control panel.
Summary of the invention
For solving above-mentioned problems of the prior art, one of them object of the present invention is to provide a kind of sensing apparatus of capacitance type touch-control panel, and it can be integrated multiple different sensing mode and effectively promote the usefulness of capacitance type touch-control panel being carried out to touch-control sensing.
From the above, according to the sensing apparatus of a kind of capacitance type touch-control panel of the present invention, in order to a capacitance type touch-control panel carried out to sensing and to produce a corresponding output signal, at least comprise: a sensing module, be coupled to described capacitance type touch-control panel, in order to offer described capacitance type touch-control panel one driving voltage and a reference voltage, and produce a sensing voltage according to an initial capacitance value and a capacitance, it includes: one drive circuit, be coupled to a first end of described capacitance type touch-control panel, in order to described driving voltage this first end to described capacitance type touch-control panel to be provided, one reference voltage provides circuit, be coupled to second end of described capacitance type touch-control panel, in order to described second end of described reference voltage to described capacitance type touch-control panel to be provided, wherein said capacitance type touch-control panel produces an initial capacitance value according to described driving voltage and described reference voltage, at least one sensing circuit, include at least one electric capacity, be coupled to second end of described capacitance type touch-control panel, in order to described electric capacity is carried out to charge/discharge according at least one first input voltage, to produce at least one capacitance, this sensing circuit is to produce described sensing voltage according to described initial capacitance value and described capacitance, and a processing module, be coupled to described sensing module, in order to described sensing circuit is carried out to a charge/discharge processing, according to described sensing voltage, produce corresponding described output signal.
Wherein said processing module comprises: an adjustment unit, is coupled to described sensing module, in order to adjust the size of described sensing voltage; And a comparing unit, be coupled to described adjustment unit, in order to described sensing voltage and a comparison reference voltage after adjusting are compared; One counting unit, is coupled to described comparing unit, in order to count described adjustment unit, described sensing voltage is adjusted to a required time cycle of described comparison reference voltage; And a converting unit, be coupled to described counting unit, in order to the described time cycle is converted to described output signal.
Wherein said driving circuit comprises: one first driving voltage source, in order to one first driving voltage to be provided; One second driving voltage source, in order to provide one second driving voltage; And one first driving voltage source switch, be coupled between the described first end and described the first driving voltage source or described the second driving voltage source of described capacitance type touch-control panel, in order to control the described first end of described capacitance type touch-control panel, be coupled to described the first driving voltage source or described the second driving voltage source, so that described the first driving voltage or described the second driving voltage described first end to described capacitance type touch-control panel to be provided; Wherein said driving voltage is described the first driving voltage or described the second driving voltage.
Wherein, described sensing circuit comprises: at least one first input voltage source, in order to described the first input voltage to be provided; At least one first input voltage source switch, is coupled to described the first input voltage source in order to control by a first end of described electric capacity; At least one first sensing circuit switch, in order to control described the second end that second end of described electric capacity is coupled to described capacitance type touch-control panel; And described electric capacity, be coupled between described second end of described the first input voltage source and described capacitance type touch-control panel, in order to charge or to discharge according to described the first input voltage, to produce described capacitance; Wherein said sensing circuit is to produce described sensing voltage according to described initial capacitance value and described capacitance.
Wherein, described sensing circuit separately comprises: at least one second input voltage source, in order at least one second input voltage to be provided; And at least one second input voltage source switch, in order to described the second input voltage source is coupled to described second end of described electric capacity; Wherein by described the second input voltage source switch, control described the second end that described the second input voltage source is coupled to described electric capacity, so that described second end of described the second input voltage to described electric capacity to be provided.
The sensing apparatus of capacitance type touch-control panel of the present invention has one or more following advantage:
(1) the sensing mode of integrating multiple capacitance type touch-control panel, in a sensing apparatus, can provide the capacitance type touch-control panel of the capacitance characteristic with various different kenels to carry out touch-control sensing use by sensing apparatus.
(2) sensing apparatus has two groups of sensing circuits, when the start simultaneously of two groups of sensing circuits, can effectively promote the efficiency of touch-control sensing.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 2 is the schematic diagram of sensing module of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 3 is the schematic diagram of an embodiment of processing module of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 4 A is the schematic diagram of an embodiment of driving circuit of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 4 B is the schematic diagram of another embodiment of driving circuit of the sensing apparatus of capacitance type touch-control panel of the present invention;
The reference voltage of the sensing apparatus that Fig. 5 is capacitance type touch-control panel of the present invention provides the schematic diagram of an embodiment of circuit;
Fig. 6 is the schematic diagram of an embodiment of sensing circuit of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 7 is the schematic diagram of a specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 8 A is the schematic diagram of one first specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 8 B is the control signal waveform figure of one first specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 9 A is the schematic diagram of one second specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Fig. 9 B is the control signal waveform figure of one second specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 10 A is the schematic diagram of one the 3rd specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 10 B is the control signal waveform figure of one the 3rd specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 11 A is the schematic diagram of one the 4th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 11 B is the control signal waveform figure of one the 4th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 12 A is the schematic diagram of one the 5th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 12 B is the control signal waveform figure of one the 5th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 13 A is the schematic diagram of one the 6th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention;
Figure 13 B is the control signal waveform figure of one the 6th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.
Embodiment
Refer to Fig. 1, the schematic diagram of an embodiment of the sensing apparatus that Fig. 1 is capacitance type touch-control panel of the present invention.In Fig. 1, the sensing apparatus 10 of capacitance type touch-control panel 20 of the present invention is in order to a capacitance type touch-control panel 20 is carried out to sensing and produce a corresponding output signal So, and it includes a sensing module 30 and a processing module 40.Sensing module 30 is coupled to capacitance type touch-control panel 20, in order to offer capacitance type touch-control panel 20 1 driving voltage SD and a reference voltage SR, and the sensing voltage SS that produces according to driving voltage SD and reference voltage SR of this capacitance type touch-control panel 20 of sensing.Processing module 40 is coupled to sensing module 30, in order to sensing circuit 30 is carried out to a charge/discharge processing, according to sensing voltage SS, produces corresponding described output signal So.
Refer to Fig. 2, the schematic diagram of the sensing module of the sensing apparatus that Fig. 2 is capacitance type touch-control panel of the present invention.As shown in Figure 2, sensing module 30 includes one drive circuit 32, a reference voltage provides circuit 34 and at least one sensing circuit 36.Driving circuit 32 is coupled to a first end N1 of capacitance type touch-control panel 20, in order to the first end N1 of driving voltage VD to capacitance type touch-control panel 20 to be provided.Reference voltage provides circuit 34 to be coupled to a second end N2 of capacitance type touch-control panel 20, in order to the described second end N2 of reference voltage Vref to capacitance type touch-control panel 20 to be provided, wherein capacitance type touch-control panel 20 produces an initial capacitance value according to driving voltage VD and reference voltage Vref.In one embodiment, at least one sensing circuit unit 36 includes at least one capacitor C 1, be coupled to the second end N2 of capacitance type touch-control panel 20, in order to described electric capacity is carried out to charge/discharge according at least one first input voltage VDD, to produce at least one capacitance, sensing circuit 36 is to produce described sensing voltage Vp according to described initial capacitance value and described capacitance.
Refer to Fig. 2 and Fig. 3, the schematic diagram of an embodiment of the processing module of the sensing apparatus that Fig. 3 is capacitance type touch-control panel of the present invention.As shown in Figures 2 and 3, processing module 40 comprises an adjustment unit 42, a comparing unit 44, a counting unit 46 and a converting unit 48.Adjustment unit 42 is coupled to sensing module 30, in order to adjust the size of sensing voltage Vp.Comparing unit 44 is coupled to adjustment unit 42, in order to sensing voltage Vp and a comparison reference voltage Vref1 after adjusting are compared.Counting unit 46 is coupled to comparing unit 44, in order to count adjustment unit 42, sensing voltage Vp is adjusted to a required time cycle of comparison reference voltage Vref1.Converting unit 48 is coupled to counting unit 46, in order to be converted to described output signal So the described time cycle.In one embodiment, adjustment unit 42 is a constant current source I, carries out charge/discharge, to adjust the size of sensing voltage Vp in order at least one capacitor C 1 to described sensing circuit 36.In addition, adjustment unit 42 separately comprises an adjustment switch S c, in order to control adjustment unit 42, whether is coupled to sensing circuit 36, with the capacitor C 1 to sensing circuit 36, carries out charge/discharge, and then adjusts the size of sensing voltage Vp.
Refer to Fig. 4 A, the schematic diagram of an embodiment of the driving circuit of the sensing apparatus that Fig. 4 A is capacitance type touch-control panel of the present invention.As shown in Figure 4 A, driving circuit 32 comprises one first driving voltage source VD1, in order to one first driving voltage to be provided.The second driving voltage source VD2, in order to provide one second driving voltage.The first driver element switch S VD, be coupled between the first end N1 and described the first driving voltage source VD1 or the second driving voltage source VD2 of capacitance type touch-control panel 20, first end N1 in order to control capacitance formula contact panel 20 is coupled to the first driving voltage source VD1 or the second driving voltage source VD2, in order to corresponding the first driving voltage or the second driving voltage first end N1 to capacitance type touch-control panel 20 that provides; Wherein said driving voltage VD is described the first driving voltage or described the second driving voltage.
Refer to Fig. 4 B, the schematic diagram of another embodiment of the driving circuit of the sensing apparatus that Fig. 4 B is capacitance type touch-control panel of the present invention.As shown in Figure 4 B, driving circuit 32 includes one first driving voltage source VD1, one second driving voltage source VD2, one first driving voltage source switch SX and one second driving voltage source switch SY.The first driving voltage source VD1 is in order to provide the first end N1 of one first driving voltage to capacitance type touch-control panel 20.The second driving voltage source VD2, in order to provide the first end N1 of one second driving voltage to capacitance type touch-control panel 20.The first driving voltage source switch SX is in order to be optionally coupled to the first end N1 of capacitance type touch-control panel 20 the first driving voltage source VD1.The second driving voltage source switch SY is in order to be optionally coupled to the first end N1 of capacitance type touch-control panel 20 the second driving voltage source VD2; Wherein driving voltage VD is described the first driving voltage or described the second driving voltage.In addition, driving circuit 32 separately includes a driving switch SZ, whether is coupled to the first end N1 of capacitance type touch-control panel 20 in order to control driving circuit 32.
Refer to Fig. 2 and Fig. 5, the reference voltage of the sensing apparatus that Fig. 5 is capacitance type touch-control panel of the present invention provides the schematic diagram of an embodiment of circuit.As shown in Fig. 2 and Fig. 5, reference voltage provides circuit 34 to include a reference voltage source Vref2 and a reference voltage switch S A, by reference voltage switch S A, control the second end N2 that is coupled to capacitance type touch-control panel 20 with reference to voltage source V ref2, so that the described second end N2 of described reference voltage Vref to capacitance type touch-control panel 20 to be provided.
Refer to Fig. 2 and Fig. 6, the schematic diagram of an embodiment of the sensing circuit of the sensing apparatus that Fig. 6 is capacitance type touch-control panel of the present invention.As shown in Figures 2 and 6, at least one sensing circuit 36 includes at least one first input voltage source VIN1, at least one first input voltage source switch S 4, at least one first sensing circuit switch S 1.At least one first input voltage source VIN1 is in order to provide at least one first input voltage VIN.At least one first input voltage source switch S 4, is coupled at least one first input voltage source VIN1 in order to control by a first end N3 of described capacitor C 1.At least one first sensing circuit switch S 1 is in order to control the second end N2 that one second end N4 of at least one capacitor C 1 is coupled to capacitance type touch-control panel 20.At least one capacitor C 1 is coupled between the second end N2 of at least one first input voltage source VIN1 and capacitance type touch-control panel 20, in order to charge or to discharge according at least one first input voltage, to produce at least one capacitance; Wherein at least one sensing circuit 36 is to produce described sensing voltage VP according at least one capacitance of the initial capacitance value of capacitance type touch-control panel 20 and at least one capacitor C 1.In addition, at least one sensing circuit 36 separately comprises at least one discharge switch S16, be coupled between the second end N4 of at least one first input voltage source VIN1 and at least one capacitor C 1, in order to the action that at least one capacitor C 1 is discharged, to reach the effect of replacement.
At least one sensing circuit 36 separately includes at least one second input voltage source VIN2, at least one second input voltage source switch S 17.At least one second input voltage source VIN2, in order to provide at least one second input voltage.At least one second input voltage source switch S 17, in order to be coupled at least one second input voltage source VIN2 the second end N4 of at least one capacitor C 1; Wherein by least one second input voltage source switch S 17, control the second end N4 that at least one second input voltage source VIN2 is coupled to at least one capacitor C 1, so that the second end N4 of at least one second input voltage at least one capacitor C 1 to be provided.
At least one sensing circuit 36 separately includes one the 3rd input voltage source switch S 3, be coupled between the 3rd input voltage source VIN3 and the first end N3 of at least one capacitor C 1, control selectivity by the 3rd input voltage source switch S 3 is coupled to the 3rd input voltage source VIN3 the first end N1 of at least one capacitor C 1, so that the first end N1 of the 3rd input voltage source VIN3 to described capacitor C 1 to be provided.
In addition, at least one sensing circuit 36 separately comprises at least one voltage derives switch S 8, S18, is coupled at least one capacitor C 1, in order to derive sensing voltage Vp from least one capacitor C 1.And in another embodiment, at least one voltage is derived the first end N3 that switch S 8 is coupled at least one capacitor C 1, in order to the first end N3 from least one capacitor C 1, derive sensing voltage Vp.At least one voltage is derived the second end N4 that switch S 18 is coupled at least one capacitor C 1, in order to the second end N4 from least one capacitor C 1, derives sensing voltage Vp.In addition, at least one sensing circuit 36 also includes at least one output voltage switch S 9, S10, corresponding at least one voltage that is coupled to is derived between switch S 8, S18 and processing module 40, in order to control sensing voltage Vp, whether export processing module 40 to, then carry out follow-up processing to produce output signal So by processing module 40.
Refer to Fig. 7, the schematic diagram of a specific embodiment of the sensing apparatus that Fig. 7 is capacitance type touch-control panel of the present invention.As shown in Figure 7, the sensing circuit 36 described in the sensing apparatus 10 of capacitance type touch-control panel 20 of the present invention includes 361,362, two sensing circuits 361,362 of two sensing circuits and can select one or two and make for sense capacitance formula contact panel 20 simultaneously.Each embodiment of the present invention is below described, in first embodiment, refers to Fig. 7, Fig. 8 A and Fig. 8 B, the schematic diagram of one first specific embodiment of the sensing apparatus that Fig. 8 A is capacitance type touch-control panel of the present invention.Fig. 8 B is the control signal waveform figure of one first specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.The present embodiment is to utilize the control signal of each switches of sensing circuit 361 collocation Fig. 8 B to carry out the touch-control sensing of capacitance type touch-control panel 20, under this sensing modes, switch S Z, S15, S6 are that short circuit (short) and switch S 17, S3, S8, S1, S19, S7, S9, S14, S5 switch are open circuit (open), first by switch S 4 and S16 short circuit, so the electric charge in C1 can be emptied, then by switch S 16 open circuits.Then by switch S X short circuit, and switch S Y open circuit, a termination driving voltage source VDD who makes the equivalent capacity Cpt of capacitance type touch-control panel 20, is then first immediately opened a way switch S A short circuit again, so charge Q=CV=Cpt* (Verf-VDD) can be stored in equivalent capacity Cpt.Then by switch S 1 short circuit, then by switch S X open circuit, switch S Y short circuit, this action is from one end of equivalent capacity Cpt, to make a call to position standard signal from high to low, so electric charge can redistribute in equivalent capacity and the first capacitor C 1, and the sensing voltage Vp that is positioned at equivalent capacity Cpt and the first capacitor C 1 during last balance is { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).And then by switch S 1 open circuit, voltage can be retained in { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).Repeat above action for several times, sensing voltage Vp can be more and more lower, and magnitude of voltage is relevant with equivalent capacity Cpt and the first capacitor C 1, because capacitance type touch-control panel etc. little capacitor C pt have different capacitances when not touching having while touching, through producing different magnitudes of voltage after sensing circuit thus, then by switch S 18 and switch S 10 short circuits, the constant current source I of processing module 40 can do the electric charge of the first capacitor C 1 to charge, when reaching reference voltage Verf, can stop, shown in the sensing voltage signal Vp of Fig. 8 B, because electric charge is different, corresponding charging required time also can be different, now by the 46 calculating duration of charging of counter, just can obtain a digital numerical value, can be converted into output signal So (as shown in Figure 5).
Refer to Fig. 9 A and Fig. 9 B, the schematic diagram of one second specific embodiment of the sensing apparatus that Fig. 9 A is capacitance type touch-control panel of the present invention.Fig. 9 B is the control signal waveform figure of one second specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.Second embodiment is identical haply with above-mentioned first embodiment, its different place is that the present embodiment is finally by switch S 8, S9 short circuit, cause the polarity at the first capacitor C 1 two ends contrary, so opposite direction of the constant current source I of processing module 40, so be to see through switch S 8, S9 short circuit to flow out to earth terminal by current source I, the effect of discharging, shown in the sensing voltage Vp signal shown in Fig. 9 B, can obtain output signal So by calculating the time of discharging.
Refer to Figure 10 A and Figure 10 B, the schematic diagram of one the 3rd specific embodiment of the sensing apparatus that Figure 10 A is capacitance type touch-control panel of the present invention.Figure 10 B is the control signal waveform figure of one the 3rd specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.The present embodiment is to utilize the control signal of each switches of sensing circuit 362 collocation Figure 10 B to carry out the touch-control sensing of capacitance type touch-control panel 20, under this sensing modes, first by switch S Z, S17, the short circuit of S3 switch and by switch S 16, S4, S8, S2, S18, S19, S9, S5 open circuit, first by switch S 15 and S6 short circuit, so the electric charge in the second capacitor C 2 can be emptied, then by switch S 15 open circuits.Follow switch S Y short circuit, and switch S X opens a way, make one end ground connection Gnd of the equivalent capacity Cpt of capacitance type touch-control panel 20, then switch S A short circuit is opened a way again, so charge Q=CV=Cpt* (Vref-0) can be stored in equivalent capacity Cpt.Then by switch S 2 short circuits, then switch S Y is opened a way, switch S X short circuit namely from one end of equivalent capacity Cpt, make a call to one by low level the signal to high levels, so electric charge can redistribute in equivalent capacity Cpt and the second capacitor C 2, and the sensing voltage that is positioned at equivalent capacity and the second capacitor C 2 during last balance is { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).And then by switch S 2 open circuit, voltage can be retained in { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).Repeat above action for several times, sensing voltage Vp can be more and more higher, and magnitude of voltage is relevant with equivalent capacity Cpt and the second capacitor C 2, through producing different magnitudes of voltage after sensing circuit 362 thus, then by switch S 6 open circuits, switch S 14 short circuits, so can the second capacitor C 2 two ends polarity are contrary, finally by switch S 7 and S10 short circuit, seeing through constant current source I can do the electric charge of the second capacitor C 2 to charge, when reaching reference voltage Verf, can stop, by calculating the duration of charging, can obtain output signal So.
Refer to Figure 11 A and Figure 11 B, the schematic diagram of one the 4th specific embodiment of the sensing apparatus that Figure 11 A is capacitance type touch-control panel of the present invention.Figure 11 B is the control signal waveform figure of one the 4th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.The 4th embodiment is identical haply with above-mentioned the 3rd embodiment, its different place is that the present embodiment is finally by switch S 9, S19 short circuit, cause the polarity at the second capacitor C 2 two ends contrary, so opposite direction of the constant current source I of processing module 40, so be to see through switch S 8, S9 short circuit to flow out to earth terminal by current source I, the effect of discharging, shown in the sensing voltage Vp shown in Figure 11 B, can obtain output signal So by calculating the time of discharging.
Refer to Figure 12 A and Figure 12 B, the schematic diagram of one the 5th specific embodiment of the sensing apparatus that Figure 12 A is capacitance type touch-control panel of the present invention.Figure 12 B is the control signal waveform figure of one the 5th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.The present embodiment is to utilize the control signal of sensing circuit 361 and 362 each switches of collocation Figure 12 B to carry out the touch-control sensing of capacitance type touch-control panel 20 simultaneously, under this sensing modes, switch S Z is that short circuit and switch S 17, S3, S9, S14, S5 are open circuit, first by switch S 15, S6, S16, S4 short circuit, so the electric charge in the first capacitor C 1 and the second capacitor C 2 can be emptied, then by switch S 16, S15 open circuit.Switch S Y follows short circuit, switch S X open circuit, makes one end ground connection Gnd of equivalent capacity Cpt, then switch S A short circuit is then opened a way, and so charge Q=CV=Cpt* (Vref-0) can be stored in equivalent capacity Cpt.Then by switch S 2 short circuits, then switch S Y open circuit, SX short circuit, be from one end of equivalent capacity Cpt, to make a call to position standard signal from low to high, so electric charge can redistribute in equivalent capacity Cpt and the second capacitor C 2, and the sensing voltage Vp that is positioned at equivalent capacity Cpt and the second capacitor C 2 during last balance is { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).And then by switch S 2 open circuit, voltage can be retained in { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).Then by switch S X short circuit, switch S Y open circuit, make a termination voltage source V DD of equivalent capacity Cpt, then first switch S A short circuit is then opened a way, so charge Q=CV=Cpt* (Verf-VDD) can be stored in equivalent capacity Cpt.Then by switch S 1 short circuit, then by switch S X open circuit, switch S Y short circuit.Be from one end of equivalent capacity Cpt, to make a call to position standard signal from high to low, so electric charge can redistribute in equivalent capacity Cpt and the first capacitor C 1, and the sensing voltage Vp that is positioned at equivalent capacity Cpt and the first capacitor C 1 during last balance is { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).And then by switch S 2 open circuit, voltage can be retained in { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).Repeat above action for several times, the voltage of an end points of the second capacitor C 2 can be more and more higher, and the voltage of an end points of the first capacitor C 1 can be more and more lower, then by switch S 6 open circuits, then switch S 19 and S8 short circuit, again by switch S 7, S18 short circuit, at this moment the electric charge of the first capacitor C 1 and the second capacitor C 2 redistribution, sensing voltage Vp can be more and more higher, and magnitude of voltage and equivalent capacity Cpt, the first capacitor C 1 and the second capacitor C 2 are relevant, through circuit thus, produce different magnitudes of voltage, finally by switch S 10 short circuits, by constant current source I, the electric charge of the first capacitor C 1 and the second capacitor C 2 is done and charged, when reaching reference voltage Verf, can stop, by calculating the duration of charging, can obtain output signal So.
Refer to Figure 13 A and Figure 13 B, the schematic diagram of one the 6th specific embodiment of the sensing apparatus that Figure 13 A is capacitance type touch-control panel of the present invention.Figure 13 B is the control signal waveform figure of one the 6th specific embodiment of the sensing apparatus of capacitance type touch-control panel of the present invention.The 6th embodiment is identical haply with above-mentioned the 5th embodiment, its different place is that the present embodiment is finally by switch S 9 short circuits, cause the polarity at the first capacitor C 1 and the second capacitor C 2 two ends contrary, so opposite direction of the constant current source I of processing module 40, so be to see through switch S 9 short circuits to flow out to earth terminal by current source I, the effect of discharging, shown in the sensing voltage Vp shown in Figure 13 B, obtains output signal So discharge time by measuring.
Above-mentioned six different embodiment all can sense capacitance formula contact panel 20, it is best wherein take the 5th and the 6th embodiment, because use the first capacitor C 1 and the second capacitor C 2 to do the action discharging and recharging, so the time of its sensing is about other embodiment half simultaneously.
The sensing apparatus of capacitance type touch-control panel of the present invention is that the sensing circuit of the different capacitance characteristics of multiple collocation is integrated in sensing apparatus, and can to capacitance type touch-control panel, carry out sensing fast and accurately, the more convenient and sensing apparatus of capacitance type touch-control panel is fast provided.
The foregoing is only illustrative, but not be restricted.Anyly do not depart from spirit of the present invention and category, and the equivalent modifications that it is carried out or change all should be contained in claim.
Claims (16)
1. a sensing apparatus for capacitance type touch-control panel, in order to a capacitance type touch-control panel carried out to sensing and to produce a corresponding output signal, is characterized in that, at least comprises:
One sensing module, is coupled to described capacitance type touch-control panel, in order to offer described capacitance type touch-control panel one driving voltage and a reference voltage, and produces a sensing voltage according to an initial capacitance value and a capacitance, and it includes:
One drive circuit, is coupled to a first end of described capacitance type touch-control panel, in order to described driving voltage this first end to described capacitance type touch-control panel to be provided;
One reference voltage provides circuit, be coupled to second end of described capacitance type touch-control panel, in order to described second end of described reference voltage to described capacitance type touch-control panel to be provided, wherein said capacitance type touch-control panel produces an initial capacitance value according to described driving voltage and described reference voltage;
At least one sensing circuit, include at least one electric capacity, be coupled to second end of described capacitance type touch-control panel, in order to described electric capacity is carried out to charge/discharge according at least one first input voltage, to produce at least one capacitance, this sensing circuit is to produce described sensing voltage according to described initial capacitance value and described capacitance; And
One processing module, is coupled to described sensing module, in order to described sensing circuit is carried out to a charge/discharge processing, according to described sensing voltage, produces corresponding described output signal.
2. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, is characterized in that, described processing module comprises:
One adjustment unit, is coupled to described sensing module, in order to adjust the size of described sensing voltage; And
One comparing unit, is coupled to described adjustment unit, in order to described sensing voltage and a comparison reference voltage after adjusting are compared;
One counting unit, is coupled to described comparing unit, in order to count described adjustment unit, described sensing voltage is adjusted to a required time cycle of described comparison reference voltage; And
One converting unit, is coupled to described counting unit, in order to the described time cycle is converted to described output signal.
3. the sensing apparatus of capacitance type touch-control panel as claimed in claim 2, is characterized in that, described adjustment unit is a constant current source, in order to described sensing circuit is carried out to charge/discharge, to adjust the size of described sensing voltage.
4. the sensing apparatus of capacitance type touch-control panel as claimed in claim 3, it is characterized in that, described adjustment unit separately comprises an adjustment switch, in order to control described adjustment unit, is coupled to described sensing module, so that described sensing circuit is carried out to charge/discharge, adjust the size of described sensing voltage.
5. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, is characterized in that, described driving circuit comprises:
One first driving voltage source, in order to provide one first driving voltage;
One second driving voltage source, in order to provide one second driving voltage; And
One first driving voltage source switch, be coupled between the described first end and described the first driving voltage source or described the second driving voltage source of described capacitance type touch-control panel, in order to control the described first end of described capacitance type touch-control panel, be coupled to described the first driving voltage source or described the second driving voltage source, so that described the first driving voltage or described the second driving voltage described first end to described capacitance type touch-control panel to be provided;
Wherein said driving voltage is described the first driving voltage or described the second driving voltage.
6. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, is characterized in that, described driving circuit comprises:
One first driving voltage source, in order to provide the described first end of one first driving voltage to described capacitance type touch-control panel;
One second driving voltage source, in order to provide the described first end of one second driving voltage to described capacitance type touch-control panel;
One first driving voltage source switch, in order to be optionally coupled to the described first end of described capacitance type touch-control panel described the first driving voltage source; And
One second driving voltage source switch, in order to be optionally coupled to the described first end of described capacitance type touch-control panel described the second driving voltage source;
Wherein said driving voltage is described the first driving voltage or described the second driving voltage.
7. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, is characterized in that, described driving circuit separately includes a driving switch, whether is coupled to the described first end of described capacitance type touch-control panel in order to control described driving circuit.
8. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, it is characterized in that, described reference voltage provides circuit to include a reference voltage source and a reference voltage switch, by this reference voltage switch, control described the second end that described reference voltage source is coupled to described capacitance type touch-control panel, so that described second end of described reference voltage to described capacitance type touch-control panel to be provided.
9. the sensing apparatus of capacitance type touch-control panel as claimed in claim 1, is characterized in that, described sensing circuit comprises:
At least one first input voltage source, in order to provide described the first input voltage;
At least one first input voltage source switch, is coupled to described the first input voltage source in order to control by a first end of described electric capacity;
At least one first sensing circuit switch, in order to control described the second end that second end of described electric capacity is coupled to described capacitance type touch-control panel; And
Described electric capacity, is coupled between described second end of described the first input voltage source and described capacitance type touch-control panel, in order to charge or to discharge according to described the first input voltage, to produce described capacitance;
Wherein said sensing circuit is to produce described sensing voltage according to described initial capacitance value and described capacitance.
10. the sensing apparatus of capacitance type touch-control panel as claimed in claim 9, it is characterized in that, described sensing circuit separately comprises at least one discharge switch, is coupled between described second end of described the first input voltage source and described electric capacity, in order to described electric capacity is discharged.
The sensing apparatus of 11. capacitance type touch-control panels as claimed in claim 9, is characterized in that, described sensing circuit separately comprises:
At least one second input voltage source, in order to provide at least one second input voltage; And
At least one second input voltage source switch, in order to be coupled to described the second input voltage source at described second end of described electric capacity;
Wherein by described the second input voltage source switch, control described the second end that described the second input voltage source is coupled to described electric capacity, so that described second end of described the second input voltage to described electric capacity to be provided.
The sensing apparatus of 12. capacitance type touch-control panels as claimed in claim 8, it is characterized in that, described sensing circuit separately includes one the 3rd input voltage source switch, be coupled between the 3rd input voltage source and the described first end of described electric capacity, control selectivity by described the 3rd input voltage source switch is coupled to described the 3rd input voltage source the described first end of described electric capacity, so that the described first end of described the 3rd input voltage source to described electric capacity to be provided.
The sensing apparatus of 13. capacitance type touch-control panels as claimed in claim 9, is characterized in that, described sensing circuit separately comprises at least one voltage derives switch, is coupled to described electric capacity, in order to derive described sensing voltage from described electric capacity.
The sensing apparatus of 14. capacitance type touch-control panels as claimed in claim 13, wherein said voltage is derived the described first end that switch is coupled to described electric capacity, in order to the described first end from described electric capacity, derives described sensing voltage.
The sensing apparatus of 15. capacitance type touch-control panels as claimed in claim 13, is characterized in that, described voltage is derived described the second end that switch is coupled to described electric capacity, in order to described the second end from described electric capacity, derives described sensing voltage.
The sensing apparatus of 16. capacitance type touch-control panels as claimed in claim 13, it is characterized in that, described sensing circuit separately comprises at least one output voltage switch, being coupled to described voltage derives between switch and described processing module, in order to control described sensing voltage, whether exports described processing module to.
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| CN104484084A (en) * | 2014-12-18 | 2015-04-01 | 合肥鑫晟光电科技有限公司 | Driving method of touch screen, touch screen and display device |
| CN104596659A (en) * | 2014-12-09 | 2015-05-06 | 友达光电股份有限公司 | Temperature sensing circuit of display, display and operation method thereof |
| CN114035707A (en) * | 2021-04-06 | 2022-02-11 | 友达光电股份有限公司 | Detection method and detection device |
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| KR20120018252A (en) * | 2010-08-20 | 2012-03-02 | 주식회사 지니틱스 | A touch screen device, a driving device and a driving method for a touch panel |
| CN102479017A (en) * | 2010-11-23 | 2012-05-30 | 三星电子株式会社 | Input sensing circuit and touch panel including the same |
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| KR20120018252A (en) * | 2010-08-20 | 2012-03-02 | 주식회사 지니틱스 | A touch screen device, a driving device and a driving method for a touch panel |
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| CN103576999B (en) | 2016-08-03 |
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