CN103576999B - The sensing device of capacitance type touch-control panel - Google Patents
The sensing device of capacitance type touch-control panel Download PDFInfo
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- CN103576999B CN103576999B CN201210256065.3A CN201210256065A CN103576999B CN 103576999 B CN103576999 B CN 103576999B CN 201210256065 A CN201210256065 A CN 201210256065A CN 103576999 B CN103576999 B CN 103576999B
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Abstract
The present invention provides the sensing device of a kind of capacitance type touch-control panel, and in order to a capacitance type touch-control panel is sensed and to be produced a corresponding output signal, it includes a sensing module and a processing module.Sensing module couples, in capacitance type touch-control panel, in order to provide a driving voltage and a reference voltage of capacitance type touch-control panel, and produces a sensing voltage according to an initial capacitance value and a capacitance.Processing module is coupled to sense module, in order to sensing circuit to carry out a charge/discharge process, produces corresponding described output signal according to sensing voltage.
Description
Technical field
The present invention relates to the sensing device of a kind of capacitance type touch-control panel, particularly to a kind of multiple sensing mode and can the sensing device of the quick capacitance type touch-control panel of sense capacitance formula contact panel integrated.
Background technology
The correlation technique of touch-control sensing is substantially improved in recent years, has great convenience on using, and contact panel the most miscellaneous has been widely used in various different electronic product.
Contact panel can design according to its type of drive and structure and be categorized as the contact panels such as resistance-type, condenser type, electromagnetic type, surface acoustic wave (SAW) formula and infrared ray (IR) formula.Current modal two types is electric resistance touch-control panel and capacitance type touch-control panel.For electric resistance touch-control panel, user need to apply pressure on electric resistance touch-control panel, makes the conducting of the partial area within electric resistance touch-control panel produce the coordinate signal of correspondence.But electric resistance touch-control panel is only capable of sensing for single point pressure, when being pressed by multiple spot, then cannot make accurate judgment.So, electric resistance touch-control panel has the restriction in its application cannot meet consumer's demand diversified for product function.
For capacitance type touch-control panel, the variable quantity of the equivalent capacitance value that its sensing principle can cause electrostatic reciprocal action when being and touch its electrode comprised by sensing human body and produce is to carry out the sensing of position of touch, because the framework of entirety is all different from electric resistance touch-control panel with sensing principle, make capacitance type touch-control panel have can the characteristic of simultaneously multi-point touch, thus gradually replace electric resistance touch-control panel and become the main flow on market.
But it is as user under increasing and the highest to the requirement of the touch-control accuracy development trend of the demand size of capacitance type touch-control panel, the sensing device of capacitance type touch-control panel needs data volume to be processed to be significantly increased, also relative to add the time required for touch-control sensing, the sensing usefulness causing capacitance type touch-control panel reduces, 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, sense according to its capacitance characteristic just can reach to be correctly completed sensing its corresponding sensing device of have to arranging in pairs or groups, for manufacturer, capacitance type touch-control panel miscellaneous must be arranged in pairs or groups various corresponding sensing device, great inconvenience can be brought in the fabrication process.
Therefore, develop a kind of various different sensing modes can being integrated in a sensing device, and the sensing device of the capacitance type touch-control panel of the sensor operation to capacitance type touch-control panel can be completed fast and accurately, it is desired by numerous manufacturer and user, and becomes the important topic sensed in device 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 purpose of the present invention is to provide the sensing device of a kind of capacitance type touch-control panel, and it can effectively promote, to integrate multiple different sensing mode, the usefulness that capacitance type touch-control panel carries out touch-control sensing.
From the above, the sensing device of a kind of capacitance type touch-control panel according to the present invention, in order to a capacitance type touch-control panel is sensed and to be produced a corresponding output signal, include at least: a sensing module, it is coupled to described capacitance type touch-control panel, in order to be supplied to 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, it is coupled to first end of described capacitance type touch-control panel, in order to provide described driving voltage to this first end of described capacitance type touch-control panel；One reference voltage provides circuit, it is coupled to second end of described capacitance type touch-control panel, in order to provide described reference voltage to described second end of described capacitance type touch-control panel, 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, it is coupled to second end of described capacitance type touch-control panel, in order to described electric capacity is carried out 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, it is coupled to described sensing module, in order to described sensing circuit to be carried out a charge/discharge process, produces corresponding described output signal according to described sensing voltage.
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, it is coupled to described adjustment unit, compares in order to the described sensing voltage after adjusting and a comparison reference voltage；One counting unit, is coupled to described comparing unit, in order to count described adjustment unit by a period of time needed for described sensing Voltage Cortrol to described comparison reference voltage；And a converting unit, it is coupled to described counting unit, in order to the described time cycle is converted to described output signal.
Wherein said drive 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, it is coupled between described first end and described first driving voltage source or the described second driving voltage source of described capacitance type touch-control panel, it is coupled to described first driving voltage source or described second driving voltage source, to provide described first driving voltage or described second driving voltage to described first end of described capacitance type touch-control panel in order to control described first end of described capacitance type touch-control panel；Wherein said driving voltage is described first driving voltage or described second driving voltage.
Wherein, described sensing circuit comprises: at least one first input voltage source, in order to provide described first input voltage；At least one first input voltage source switch, is coupled to described first input voltage source by first end of described electric capacity in order to controlling；At least one first sensing circuit switch, in order to control to be coupled to second end of described electric capacity described second end of described capacitance type touch-control panel；And described electric capacity, it is coupled between described first input voltage source and described second end of described capacitance type touch-control panel, in order to be charged according to described first input voltage or to discharge, 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 additionally 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 described second input voltage source to be coupled to described second end of described electric capacity；Wherein by described second input voltage source on-off control, described second input voltage source is coupled to described second end of described electric capacity, to provide described second input voltage to described second end of described electric capacity.
The sensing device of the capacitance type touch-control panel of the present invention has one or more following advantage:
(1) the sensing mode integrating multiple capacitance type touch-control panel senses in device in one, and the capacitance type touch-control panel of the capacitance characteristic with various different kenel can be provided to carry out touch-control sensing use by sensing device.
(2) sensing device 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 device of the capacitance type touch-control panel of the present invention；
Fig. 2 is the schematic diagram of the sensing module of the sensing device of the capacitance type touch-control panel of the present invention；
Fig. 3 is the schematic diagram of an embodiment of the processing module of the sensing device of the capacitance type touch-control panel of the present invention；
Fig. 4 A is the schematic diagram of an embodiment of the drive circuit of the sensing device of the capacitance type touch-control panel of the present invention；
Fig. 4 B is the schematic diagram of another embodiment of the drive circuit of the sensing device of the capacitance type touch-control panel of the present invention；
The reference voltage of the sensing device of the capacitance type touch-control panel that Fig. 5 is the present invention provides the schematic diagram of an embodiment of circuit；
Fig. 6 is the schematic diagram of an embodiment of the sensing circuit of the sensing device of the capacitance type touch-control panel of the present invention；
Fig. 7 is the schematic diagram of a specific embodiment of the sensing device of the capacitance type touch-control panel of the present invention；
Fig. 8 A is the schematic diagram of one first specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention；
Fig. 9 A is the schematic diagram of one second specific embodiment of the sensing device of the 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 device of the 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 device of the 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 device of the 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 device of the 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 device of the 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 device of the 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 device of the 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 device of the 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 device of the capacitance type touch-control panel of the present invention.
Detailed description of the invention
Refer to the schematic diagram of an embodiment of the sensing device of the capacitance type touch-control panel that Fig. 1, Fig. 1 are the present invention.In Fig. 1, the sensing device 10 of the capacitance type touch-control panel 20 of the present invention is in order to sense to a capacitance type touch-control panel 20 and to produce a corresponding output signal So, and it includes sensing module 30 and a processing module 40.Sensing module 30 is coupled to capacitance type touch-control panel 20, in order to be supplied to a capacitance type touch-control panel 20 1 driving voltage SD and reference voltage SR, and sense this capacitance type touch-control panel 20 according to a sensing voltage SS produced by driving voltage SD and reference voltage SR.Processing module 40 is coupled to sense module 30, in order to sensing circuit 30 is carried out a charge/discharge process, produces corresponding described output signal So according to sensing voltage SS.
Refer to the schematic diagram of the sensing module of the sensing device of the capacitance type touch-control panel that Fig. 2, Fig. 2 are the present invention.As in figure 2 it is shown, sensing module 30 includes one drive circuit 32, reference voltage provides circuit 34 and at least one sensing circuit 36.Drive circuit 32 is coupled to a first end N1 of capacitance type touch-control panel 20, in order to provide driving voltage VD to the first end N1 of capacitance type touch-control panel 20.Reference voltage provides circuit 34 to be coupled to a second end N2 of capacitance type touch-control panel 20, in order to provide reference voltage Vref to the described second end N2 of capacitance type touch-control panel 20, 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 electric capacity C1, it is coupled to the second end N2 of capacitance type touch-control panel 20, in order to described electric capacity is carried out 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 the schematic diagram of an embodiment of the processing module of the sensing device of the capacitance type touch-control panel that Fig. 2 and Fig. 3, Fig. 3 are the present invention.As shown in Figures 2 and 3, processing module 40 comprises adjustment unit 42, comparing unit 44, counting unit 46 and a converting unit 48.Adjustment unit 42 is coupled to sense module 30, in order to adjust the size of sensing voltage Vp.Comparing unit 44 is coupled to adjustment unit 42, compares in order to the sensing voltage Vp after adjusting an and comparison reference voltage Vref1.Counting unit 46 is coupled to comparing unit 44, adjusts sensing voltage Vp to a period of time needed for comparison reference voltage Vref1 in order to count adjustment unit 42.Converting unit 48 is coupled to counting unit 46, in order to the described time cycle to be converted to described output signal So.In one embodiment, adjustment unit 42 is a constant current source I, in order at least one electric capacity C1 of described sensing circuit 36 is carried out charge/discharge, to adjust the size of sensing voltage Vp.Additionally, adjustment unit 42 additionally comprises an adjustment switch Sc, in order to control whether adjustment unit 42 is coupled to sensing circuit 36, carry out charge/discharge with the electric capacity C1 to sensing circuit 36, and then adjust the size of sensing voltage Vp.
Refer to the schematic diagram of an embodiment of the drive circuit of the sensing device of the capacitance type touch-control panel that Fig. 4 A, Fig. 4 A is the present invention.As shown in Figure 4 A, drive circuit 32 comprises one first driving voltage source VD1, in order to provide one first driving voltage.Second driving voltage source VD2, in order to provide one second driving voltage.First driver element switch SVD, it is coupled between the first end N1 and described first driving voltage source VD1 or the second driving voltage source VD2 of capacitance type touch-control panel 20, it is coupled to the first driving voltage source VD1 or the second driving voltage source VD2, in order to the first end N1 of corresponding offer the first driving voltage or the second driving voltage to capacitance type touch-control panel 20 in order to control the first end N1 of capacitance type touch-control panel 20；Wherein said driving voltage VD is described first driving voltage or described second driving voltage.
Refer to the schematic diagram of another embodiment of the drive circuit of the sensing device of the capacitance type touch-control panel that Fig. 4 B, Fig. 4 B is the present invention.As shown in Figure 4 B, drive 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.First driving voltage source VD1 is in order to provide one first driving voltage to the first end N1 of capacitance type touch-control panel 20.Second driving voltage source VD2, in order to provide one second driving voltage to the first end N1 of capacitance type touch-control panel 20.First driving voltage source switch SX is in order to be optionally coupled to the first driving voltage source VD1 by the first end N1 of capacitance type touch-control panel 20.Second driving voltage source switch SY is in order to be optionally coupled to the second driving voltage source VD2 by the first end N1 of capacitance type touch-control panel 20；Wherein driving voltage VD is described first driving voltage or described second driving voltage.Additionally, drive circuit 32 has additionally comprised a driving switch SZ, whether it is coupled to the first end N1 of capacitance type touch-control panel 20 in order to control drive circuit 32.
The reference voltage of the sensing device referring to the capacitance type touch-control panel that Fig. 2 and Fig. 5, Fig. 5 are the present invention provides the schematic diagram of an embodiment of circuit.As shown in figures 2 and 5, reference voltage provides circuit 34 to include a reference voltage source Vref2 and reference voltage switch SA, control to be coupled to reference voltage source Vref2 the second end N2 of capacitance type touch-control panel 20 by reference to voltage switch SA, to provide described reference voltage Vref to the described second end N2 of capacitance type touch-control panel 20.
Refer to the schematic diagram of an embodiment of the sensing circuit of the sensing device of the capacitance type touch-control panel that Fig. 2 and Fig. 6, Fig. 6 are 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 S4, at least one first sensing circuit switch S1.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 S4, is coupled at least one first input voltage source VIN1 by the one first end N3 of described electric capacity C1 in order to controlling.At least one first sensing circuit switch S1 is in order to control to be coupled to the one second end N4 of at least one electric capacity C1 the second end N2 of capacitance type touch-control panel 20.At least one electric capacity C1 is coupled between at least one first input voltage source VIN1 and the second end N2 of capacitance type touch-control panel 20, in order to be charged according at least one first input voltage or to discharge, to produce at least one capacitance；At least one of which sensing circuit 36 is that at least one capacitance of the initial capacitance value according to capacitance type touch-control panel 20 and at least one electric capacity C1 produces described sensing voltage VP.In addition, at least one sensing circuit 36 additionally comprises at least one discharge switch S16, it is coupled between at least one the first input voltage source VIN1 and the second end N4 of at least one electric capacity C1, in order to the action that at least one electric capacity C1 is discharged, to reach effect of replacement.
At least one sensing circuit 36 has additionally comprised at least one second input voltage source VIN2, at least one second input voltage source switch S17.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 S17, in order to be coupled to the second end N4 of at least one electric capacity C1 by least one second input voltage source VIN2；Wherein control to be coupled at least one second input voltage source VIN2 the second end N4 of at least one electric capacity C1 by least one second input voltage source switch S17, to provide at least one second input voltage to the second end N4 of at least one electric capacity C1.
At least one sensing circuit 36 has additionally comprised one the 3rd input voltage source switch S3, it is coupled between the 3rd input voltage source VIN3 and the first end N3 of at least one electric capacity C1, by the selectivity that controls of the 3rd input voltage source switch S3, the 3rd input voltage source VIN3 is coupled to the first end N1 of at least one electric capacity C1, to provide the first end N1 of the 3rd input voltage source VIN3 to described electric capacity C1.
Additionally, at least one sensing circuit 36 additionally comprises at least one voltage derives switch S8, S18, it is coupled at least one electric capacity C1, in order to derive sensing voltage Vp from least one electric capacity C1.And in another embodiment, at least one voltage is derived switch S8 and is coupled to the first end N3 of at least one electric capacity C1, in order to derive sensing voltage Vp from the first end N3 of at least one electric capacity C1.At least one voltage is derived switch S18 and is then coupled to the second end N4 of at least one electric capacity C1, in order to derive sensing voltage Vp from the second end N4 of at least one electric capacity C1.In addition, at least one sensing circuit 36 also includes at least one output voltage switch S9, S10, corresponding at least one voltage that is coupled to is derived between switch S8, S18 and processing module 40, in order to control whether sensing voltage Vp exports to processing module 40, then carried out follow-up process to produce output signal So by processing module 40.
Refer to the schematic diagram of a specific embodiment of the sensing device of the capacitance type touch-control panel that Fig. 7, Fig. 7 are the present invention.As it is shown in fig. 7, the sensing circuit 36 that the sensing of the capacitance type touch-control panel 20 of the present invention is described in device 10 includes two sensing circuits 361,362, two sensing circuits 361,362 can select one or two to be made for sense capacitance formula contact panel 20 simultaneously.Each detailed description of the invention of the following description present invention, in first detailed description of the invention, refers to Fig. 7, Fig. 8 A and Fig. 8 B, and Fig. 8 A is the schematic diagram of one first specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.The present embodiment is to utilize sensing circuit 361 to arrange in pairs or groups each control signal switched of Fig. 8 B to carry out the touch-control sensing of capacitance type touch-control panel 20, under this sensing modes, switch SZ, S15, S6 switch S17, S3, S8, S1, S19, S7, S9, S14, S5 switch for open circuit (open) for short circuit (short), first by short-circuit for switch S4 and S16, so the electric charge in C1 can be emptied, then will switch S16 open circuit.Then by short-circuit for switch SX, and switch SY open circuit, make a termination driving voltage source VDD of equivalent capacity Cpt of capacitance type touch-control panel 20, the most first switch SA short circuit is opened a way the most again, so charge Q=CV=Cpt* (Verf-VDD) can be stored in equivalent capacity Cpt.Then by short-circuit for switch S1, then switch SX is opened a way, switchs SY short circuit, this action is i.e. that level signal from high to low is made a call in the one end from equivalent capacity Cpt, so electric charge can redistribute in equivalent capacity and the first electric capacity C1, and the sensing voltage Vp being finally positioned at equivalent capacity Cpt and the first electric capacity C1 during balance is { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).Opened a way by switch S1, then voltage can be retained in { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1) the most again.Repeat above action for several times, then sensing voltage Vp can be more and more lower, and magnitude of voltage is relevant with equivalent capacity Cpt and the first electric capacity C1, because capacitance type touch-control panel wait small capacitances Cpt when there being touch with not touching time have different capacitances, different magnitudes of voltage can be produced after thus sensing circuit, then by short-circuit for switch S18 and switch S10, the electric charge of the first electric capacity C1 can be done and charge by the constant current source I of processing module 40, then can stop when reaching reference voltage Verf, as shown in the sensing voltage signal Vp of Fig. 8 B, owing to electric charge is different, corresponding charging required time also can be different, now calculate the charging interval by enumerator 46 and just can get a digital numerical value, output signal So (as shown in Figure 5) can be converted into.
Referring to Fig. 9 A and Fig. 9 B, Fig. 9 A is the schematic diagram of one second specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.Second embodiment is substantially the same with above-mentioned first embodiment, its different place be the present embodiment be finally by switch S8, S9 short circuit, cause the opposite polarity at the first electric capacity C1 two ends, therefore the constant current source I's of processing module 40 is in opposite direction, so being to flow out to earth terminal through by switch S8, S9 short circuit by current source I, carry out the effect discharged, shown in the sensing voltage Vp signal as shown in Fig. 9 B, i.e. can get output signal So by the time calculating electric discharge.
Referring to Figure 10 A and Figure 10 B, Figure 10 A is the schematic diagram of one the 3rd specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.The present embodiment is to utilize sensing circuit 362 to arrange in pairs or groups each control signal switched of Figure 10 B to carry out the touch-control sensing of capacitance type touch-control panel 20, under this sensing modes, first will switch SZ, S17, S3 switch short and switch S16, S4, S8, S2, S18, S19, S9, S5 will be opened a way, first by short-circuit for switch S15 and S6, so the electric charge in the second electric capacity C2 can be emptied, then will switch S15 open circuit.Then by short-circuit for switch SY, and switch SX open circuit, make one end ground connection Gnd of equivalent capacity Cpt of capacitance type touch-control panel 20, then switch SA short circuit is opened a way again, so charge Q=CV=Cpt* (Vref-0) can be stored in equivalent capacity Cpt.Then by short-circuit for switch S2, then switch SY is opened a way, switch SX short circuit namely makes a call to one by the signal of low level to high levels from one end of equivalent capacity Cpt, so electric charge can redistribute in equivalent capacity Cpt and the second electric capacity C2, and the sensing voltage being finally positioned at equivalent capacity and the second electric capacity C2 during balance is { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).Opened a way by switch S2, then voltage can be retained in { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2) the most again.Repeat above action for several times, then sensing voltage Vp can be more and more higher, and magnitude of voltage is relevant with equivalent capacity Cpt and the second electric capacity C2, different magnitudes of voltage can be produced after thus sensing circuit 362, then switch S6 is opened a way, switchs S14 short circuit, so can be by the second electric capacity C2 two ends opposite polarity, finally by short-circuit for switch S7 and S10, the electric charge of the second electric capacity C2 can be done through constant current source I and charge, then can stop when reaching reference voltage Verf, i.e. can get output signal So by calculating the charging interval.
Referring to Figure 11 A and Figure 11 B, Figure 11 A is the schematic diagram of one the 4th specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.4th embodiment is substantially the same with above-mentioned 3rd embodiment, its different place be the present embodiment be finally by switch S9, S19 short circuit, cause the opposite polarity at the second electric capacity C2 two ends, therefore the constant current source I's of processing module 40 is in opposite direction, so being to flow out to earth terminal through by switch S8, S9 short circuit by current source I, carry out the effect discharged, shown in the sensing voltage Vp as shown in Figure 11 B, i.e. can get output signal So by the time calculating electric discharge.
Referring to Figure 12 A and Figure 12 B, Figure 12 A is the schematic diagram of one the 5th specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.The present embodiment is that the control signal simultaneously utilizing sensing circuit 361 and 362 collocation each switch of Figure 12 B is to carry out the touch-control sensing of capacitance type touch-control panel 20, under this sensing modes, switch SZ switchs S17, S3, S9, S14, S5 for open circuit for short circuit, first by short-circuit to switch S15, S6, S16, S4, so the electric charge in the first electric capacity C1 and the second electric capacity C2 can be emptied, then will switch S16, S15 open circuit.Switch SY then short circuit, switch SX open circuit so that one end ground connection Gnd of equivalent capacity Cpt, then then opened a way switch SA short circuit, so can charge Q=CV=Cpt* (Vref-0) be stored in equivalent capacity Cpt.Then by short-circuit for switch S2, then switch SY open circuit, SX short circuit, it is i.e. that level signal from low to high is made a call in the one end from equivalent capacity Cpt, so electric charge can redistribute in equivalent capacity Cpt and the second electric capacity C2, and the sensing voltage Vp being finally positioned at equivalent capacity Cpt and the second electric capacity C2 during balance is { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2).Opened a way by switch S2, then voltage can be retained in { (Vref-0) * Cpt+VDD*Cpt}/(Cpt+C2) the most again.Then by short-circuit for switch SX, switch SY open circuit so that a termination voltage source VDD of equivalent capacity Cpt, the most first switch SA short circuit is then opened a way, so charge Q=CV=Cpt* (Verf-VDD) can be stored in equivalent capacity Cpt.Then will switch S1 short circuit, then will switch SX open circuit, switch SY short circuit.It is i.e. that level signal from high to low is made a call in the one end from equivalent capacity Cpt, so electric charge can redistribute in equivalent capacity Cpt and the first electric capacity C1, and the sensing voltage Vp being finally positioned at equivalent capacity Cpt and the first electric capacity C1 during balance is { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1).Opened a way by switch S2, then voltage can be retained in { (Vref-VDD) * Cpt+VDD*C1}/(Cpt+C1) the most again.Repeat above action for several times, then the voltage of the end point of the second electric capacity C2 can be more and more higher, and the voltage of the end point of the first electric capacity C1 can be more and more lower, then switch S6 is opened a way, then switch S19 and S8 short circuit, S7 will be switched again, S18 short circuit, at this moment the electric charge redistribution of the first electric capacity C1 and the second electric capacity C2, sensing voltage Vp can be more and more higher, and magnitude of voltage and equivalent capacity Cpt, first electric capacity C1 and the second electric capacity C2 is relevant, different magnitudes of voltage is produced through thus circuit, finally by short-circuit for switch S10, by constant current source I the electric charge of the first electric capacity C1 and the second electric capacity C2 done and charge, then can stop when reaching reference voltage Verf, output signal So can be obtained by calculating the charging interval.
Referring to Figure 13 A and Figure 13 B, Figure 13 A is the schematic diagram of one the 6th specific embodiment of the sensing device of the 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 device of the capacitance type touch-control panel of the present invention.6th embodiment is substantially the same with above-mentioned 5th embodiment, its different place be the present embodiment be finally by switch S9 short circuit, cause the first electric capacity C1 and the opposite polarity at the second electric capacity C2 two ends, therefore the constant current source I's of processing module 40 is in opposite direction, so being to flow out to earth terminal through by switch S9 short circuit by current source I, carry out the effect discharged, shown in the sensing voltage Vp as shown in Figure 13 B, obtain output signal So discharge time by measuring.
Above-mentioned six different embodiments all can sense capacitance formula contact panel 20, wherein with the 5th and the 6th embodiment be optimal, because use the first electric capacity C1 and the second electric capacity C2 to make the action of discharge and recharge simultaneously, so the time of its sensing is about the half of other embodiments.
The sensing device of the capacitance type touch-control panel of the present invention is to be integrated in sensing device by the sensing circuit of different for multiple collocation capacitance characteristics, and can fast and accurately capacitance type touch-control panel be sensed, it is provided that the more convenient and sensing device of quick capacitance type touch-control panel.
The foregoing is only illustrative, rather than be restricted.Any spirit and scope without departing from the present invention, and the equivalent modifications carrying out it or change, be intended to be limited solely by claim.
Claims (15)
1. a sensing device for capacitance type touch-control panel, in order to a capacitance type touch-control panel is sensed and to be produced a corresponding output signal, it is characterised in that include at least:
One sensing module, is coupled to described capacitance type touch-control panel, in order to be supplied to 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 first end of described capacitance type touch-control panel, in order to provide described driving voltage to this first end of described capacitance type touch-control panel；
One reference voltage provides circuit, it is coupled to second end of described capacitance type touch-control panel, in order to provide described reference voltage to described second end of described capacitance type touch-control panel, 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, it is coupled to second end of described capacitance type touch-control panel, in order to described electric capacity is carried out 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 to carry out a charge/discharge process, produces corresponding described output signal according to described sensing voltage, and 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, compares in order to the described sensing voltage after adjusting and a comparison reference voltage；
One counting unit, is coupled to described comparing unit, in order to count described adjustment unit by a period of time needed for described sensing Voltage Cortrol to 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.
2. the sensing device of capacitance type touch-control panel as claimed in claim 1, it is characterised in that described adjustment unit is a constant current source, in order to described sensing circuit is carried out charge/discharge, to adjust the size of described sensing voltage.
3. the sensing device of capacitance type touch-control panel as claimed in claim 2, it is characterized in that, described adjustment unit additionally comprises an adjustment switch, is coupled to described sensing module in order to control described adjustment unit, so that described sensing circuit is carried out charge/discharge, adjust the size of described sensing voltage.
4. the sensing device of capacitance type touch-control panel as claimed in claim 1, it is characterised in that described drive 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, it is coupled between described first end and described first driving voltage source or the described second driving voltage source of described capacitance type touch-control panel, it is coupled to described first driving voltage source or described second driving voltage source, to provide described first driving voltage or described second driving voltage to described first end of described capacitance type touch-control panel in order to control described first end of described capacitance type touch-control panel；
Wherein said driving voltage is described first driving voltage or described second driving voltage.
5. the sensing device of capacitance type touch-control panel as claimed in claim 1, it is characterised in that described drive circuit comprises:
One first driving voltage source, in order to provide one first driving voltage to described first end of described capacitance type touch-control panel；
One second driving voltage source, in order to provide one second driving voltage to described first end of described capacitance type touch-control panel；
One first driving voltage source switch, in order to be optionally coupled to described first driving voltage source by described first end of described capacitance type touch-control panel；And
One second driving voltage source switch, in order to be optionally coupled to described second driving voltage source by described first end of described capacitance type touch-control panel；
Wherein said driving voltage is described first driving voltage or described second driving voltage.
6. the sensing device of capacitance type touch-control panel as claimed in claim 1, it is characterised in that described drive circuit has additionally comprised a driving switch, whether is coupled to described first end of described capacitance type touch-control panel in order to control described drive circuit.
7. the sensing device 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 reference voltage switch, by this reference voltage on-off control, described reference voltage source is coupled to described second end of described capacitance type touch-control panel, to provide described reference voltage to described second end of described capacitance type touch-control panel.
8. the sensing device of capacitance type touch-control panel as claimed in claim 1, it is characterised in that described sensing circuit comprises:
At least one first input voltage source, in order to provide described first input voltage；
At least one first input voltage source switch, is coupled to described first input voltage source by first end of described electric capacity in order to controlling；
At least one first sensing circuit switch, in order to control to be coupled to second end of described electric capacity described second end of described capacitance type touch-control panel；And
Described electric capacity, is coupled between described first input voltage source and described second end of described capacitance type touch-control panel, in order to be charged according to described first input voltage or to discharge, to produce described capacitance.
9. the sensing device of capacitance type touch-control panel as claimed in claim 8, it is characterized in that, described sensing circuit additionally comprises at least one discharge switch, is coupled between described first input voltage source and described second end of described electric capacity, in order to discharge described electric capacity.
10. the sensing device of capacitance type touch-control panel as claimed in claim 8, it is characterised in that described sensing circuit additionally 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 second end of described electric capacity by described second input voltage source；
Wherein by described second input voltage source on-off control, described second input voltage source is coupled to described second end of described electric capacity, to provide described second input voltage to described second end of described electric capacity.
The sensing device of 11. capacitance type touch-control panels as claimed in claim 7, it is characterized in that, described sensing circuit has additionally comprised one the 3rd input voltage source switch, it is coupled between one the 3rd input voltage source and described first end of described electric capacity, by the selectivity that controls of described 3rd input voltage source switch, described 3rd input voltage source is coupled to described first end of described electric capacity, to provide described 3rd input voltage source to described first end of described electric capacity.
The sensing device of 12. capacitance type touch-control panels as claimed in claim 8, it is characterised in that described sensing circuit additionally comprises at least one voltage and derives switch, is coupled to described electric capacity, in order to derive described sensing voltage from described electric capacity.
The sensing device of 13. capacitance type touch-control panels as claimed in claim 12, wherein said voltage is derived switch and is coupled to described first end of described electric capacity, in order to derive described sensing voltage from described first end of described electric capacity.
The sensing device of 14. capacitance type touch-control panels as claimed in claim 12, it is characterised in that described voltage is derived switch and is coupled to described second end of described electric capacity, in order to derive described sensing voltage from described second end of described electric capacity.
The sensing device of 15. capacitance type touch-control panels as claimed in claim 12, it is characterized in that, described sensing circuit additionally comprises at least one output voltage switch, it is coupled to described voltage and derives between switch and described processing module, in order to control whether described sensing voltage exports to described processing module.
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| CN104484084B (en) * | 2014-12-18 | 2017-09-29 | 合肥鑫晟光电科技有限公司 | A kind of driving method of touch-screen, touch-screen and display device |
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| CN101702109A (en) * | 2009-10-26 | 2010-05-05 | 旭曜科技股份有限公司 | Sensing circuit of capacitive 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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| CN101702109A (en) * | 2009-10-26 | 2010-05-05 | 旭曜科技股份有限公司 | Sensing circuit of capacitive 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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