CN105610422B - Touch-control sensing system - Google Patents
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- CN105610422B CN105610422B CN201410657890.3A CN201410657890A CN105610422B CN 105610422 B CN105610422 B CN 105610422B CN 201410657890 A CN201410657890 A CN 201410657890A CN 105610422 B CN105610422 B CN 105610422B
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Abstract
A kind of touch-control sensing system, touch-control sensing signal generator comprising signal generator, comprising switch, the first constant current source, the first touch pad and touch-control comparator, the reference signal generator and processing module for including switch, the second constant current source, the second touch pad and reference comparator；Input signal is reached switch by signal generator, makes touch-control comparator that high potential signal are sent to processing module respectively with reference comparator when first and second constant current source being made to charge to first and second touch pad respectively in switch conduction, and reaching reference voltage；When first touch pad is by touch-control and not by touch-control, touch-control comparator exports the first high potential signal through first and second time delay respectively, and reference comparator exports the second high potential signal through the 3rd time delay；Processing module exports touch-control result according to time delay.
Description
Technical field
The present invention is related to a kind of touch-control sensing system, espespecially a kind of touch-control sense using constant current source to touch pad charging
Examining system.
Background technology
With the progress that science and technology is with rapid changepl. never-ending changes and improvements, the prosperity at network has made various electronic devices be flooded with people’s lives, and
Electronic device is required to by test in touch circuit now all based on touch so that is actually applied to electronics
It can more be smoothed out without easily going wrong on device.
And the patent document of existing touch circuit such as patent publication No. the 200701639th, referring to Fig. 1, Fig. 1 is shown
Show the block schematic diagram of the touch-control sensing system of prior art, as shown in Figure 1, existing touch circuit PA1 includes an input
Signal generator PA11, multiple touch inductive signal generator PA12, PA13 (one is only indicated in figure), multiple variable delays
Element PA14 (one is only indicated in figure), multiple D-type flip-flop PA15 and a controller PA16.
However, as shown in Figure 1, touch inductive signal generator PA12, PA13 are mainly by resistance and capacitance (touch-control
By capacitance in pad) it is formed, but this design easily makes signal wave with temperature and voltage and causes the situation of shakiness, and then
So that easily there is the problem of erroneous judgement when whether sensing has touch-control.
The content of the invention
Signal in view of existing touch circuit easily waves with temperature and voltage and causes the situation of shakiness,
Thus generally there is the problem of touch-control erroneous judgement.Edge this, present invention generally provides a kind of touch-control sensing system, mainly with current source
Substitute original resistance, and then solve the problems, such as the prior art.
In order to achieve the above objectives, the application provides a kind of touch-control sensing system, comprising：One signal generator, to generate
One input signal；An at least touch-control sensing signal generator, is electrically connected at the signal generator, and comprising：One first fixed electricity
Stream source, to provide one first constant current；One first switch is electrically connected at first constant current source and the signal generator,
To receive the input signal, so as to being turned on and off according to the input signal；It is first fixed to be electrically connected at this for one second switch
Current source and the signal generator, to receive the input signal, so as to being turned on and off according to the input signal；One first touches
Control pad is electrically connected at first constant current source, the first switch and the second switch, and to touch-control；An and touch-control ratio
Compared with device, there is one first input point and one second input point, which receives one first reference voltage, second input
Point is electrically connected at first constant current source, the first switch, the second switch and first touch pad, to export one the
One low potential exports signal；The first switch is opened in a first time and close the second switch in the input signal,
And first touch pad by touch-control when, first constant current to first touch pad charge, make the touch-control comparator through one first
Time delay and in one second time from first low potential output signal be converted to output one first high potential output signal；
The input signal at the first time opens the first switch and closes the second switch in this, and first touch pad is not touched
During control, which charges to first touch pad, makes the touch-control comparator through one second time delay and in one the 3rd
Time is converted to from first low potential output signal and exports first high potential output signal；One reference signal generator, bag
Contain：One second constant current source, to provide one second constant current；One the 3rd switch, be electrically connected at second constant current source with
The signal generator, to receive the input signal, so as to being turned on and off according to the input signal；One the 4th switch, electrically
Second constant current source and the signal generator are connected to, to receive the input signal, so as to being opened according to the input signal
Or it closes；One second touch pad, is electrically connected at second constant current source, the 3rd switch and the 4th switch, and for this
Two constant-current charges；And a reference comparator, there is one the 3rd input point and one the 4th input point, the 3rd input point receives
One second reference voltage, the 4th input point be electrically connected at second constant current source, the 3rd switch, the 4th switch and
Second touch pad, to export one second low potential output signal；The 3rd is set to open at the first time in this in the input signal
When closing unlatching and making the 4th switch closing, which charges to second touch pad, makes the reference comparator through one
3rd time delay and in one the 4th time from second low potential output signal be converted to output one second high potential output letter
Number；And a processing module, the touch-control comparator and the reference comparator are electrically connected at, to receive second high potential
Export signal, and to receive one of first low potential output signal and first high potential output signal person, so as to according to
One of signal person and second high potential output signal are exported according to first low potential output signal and first high potential
Export an at least touch-control result；Wherein, which was more than for the 3rd time delay, which is less than should
3rd time delay.
Above-mentioned touch-control sensing system, the first switch are a PMOS switch with the 3rd switch, and the second switch is with being somebody's turn to do
4th switch is a NMOS switch.
Above-mentioned touch-control sensing system, second touch pad are one of a fixed capacity and a tunable capacitor person.
Above-mentioned touch-control sensing system, the current value of second constant current is more than the current value of first constant current, and is
The multiple of the current value of first constant current.
Above-mentioned touch-control sensing system, the processing module include：
One first latch unit is electrically connected at the touch-control comparator and the reference comparator, to receive the first low electricity
Position output signal exports one of signal person, and the second high electricity exported according to the reference comparator with first high potential
Position output signal controls first low potential output signal to export signal output with first high potential；And
One controller is electrically connected at first latch unit and the reference comparator, defeated to receive first low potential
Go out signal and export one of signal person and second high potential output signal with first high potential, and according to the first low electricity
Position output signal exports one of signal person with first high potential and second high potential output signal output at least one is touched
Control result.
Above-mentioned touch-control sensing system, the controller are one of a microprocessing unit and digital signal processor person.
Above-mentioned touch-control sensing system, the processing module further include a digital delay, which is electrically connected
Between the reference comparator, first latch unit and the controller, to receive second high potential output signal, so as to
First latch unit, which is triggered, according to second high potential output signal exports first low potential output signal and the first high electricity
One of position output signal person, and second high potential is exported into signal output to the controller.
Above-mentioned touch-control sensing system, the digital delay include：
At least one second latch unit, is electrically connected at the reference comparator and the controller, to receive the second high electricity
One of go out delayed control signal transmitted by position output signal and the controller, so as to make the controller control second latch unit according to
One delay output signal of signal output is exported according to second high potential；And
One multiplexer is electrically connected at the reference comparator, first latch unit, second latch unit and the controller,
To receive second high potential output signal that the reference comparator transmits and second latch unit is sent out this
Delay output signal, so as to a multiplexing processing signal comprising second high potential output signal is sent to first latch unit
With the controller.
Above-mentioned touch-control sensing system, first latch unit are D-type flip-flop with second latch unit.
After technical way by the touch-control sensing system of the invention used, due to using constant current source to touch-control
Pad electricity, therefore, can't cause the situation of swinging of signal with the variation of temperature or voltage, therefore touch-control is sentenced in practice
Break and be not easy to the situation of erroneous judgement and promote the stability of judgement.
Specific embodiment of the present invention will make further explanation by following embodiment and attached drawing.
Description of the drawings
Fig. 1 is the block schematic diagram of the touch-control sensing system of display prior art；
Fig. 2 is the block schematic diagram of the touch-control sensing system of display present pre-ferred embodiments；
Fig. 3 is that the first touch pad of the touch-control sensing system of display present pre-ferred embodiments is illustrated by the waveform of touch-control
Figure；And
Fig. 4 is that the first touch pad of the touch-control sensing system of display present pre-ferred embodiments is not illustrated by the waveform of touch-control
Figure.
Wherein, reference numeral：
PA1 touch circuit PA11 input signal generators
PA12, PA13 touch inductive signal generator
PA14 variable delay element PA15 D-type flip-flops
1 touch-control sensing system of PA16 controllers
11 signal generator, 12 touch-control sensing signal generator
121 first constant current source, 122 first switch
123 second switch, 124 first touch pad
125 touch-control comparator, 1,251 first input point
1252 second input point, 13 reference signal generator
131 second constant current sources 132 the 3rd switch
133 the 4th 134 second touch pads of switch
The 3rd input point of 135 reference comparator 1351
1352 the 4th input point, 14 processing module
141 first latch unit, 142 controller
143 digital delay, 1,431 second latch unit
1432 the first constant currents of multiplexer I1
I2 the second constant current S1 input signals
The first low potentials of S2 output signal S3 the first high potential output signals
The second low potentials of S4 output signal S5 the second high potential output signals
S6 delayed control signal S7 delay output signals
S8 multiplexings handle signal S9 touch-control results
V1 the first reference voltage the second reference voltages of V2
T1 the second time delays of the first time delay T2
The 3rd time delay t1 of T3 are at the first time
The 4th times of second times of t2 t3
The 3rd times of t4 time delays t5
Specific embodiment
Due to touch-control sensing system provided by the present invention, combination embodiment is too numerous to enumerate, therefore herein no longer one by one
It repeats, only enumerates a preferred embodiment and illustrated.
Referring to Fig. 2, Fig. 2 shows the block schematic diagram of the touch-control sensing system of present pre-ferred embodiments.Such as Fig. 2 institutes
Show, the touch-control sensing system of present pre-ferred embodiments includes a signal generator 11,12 (its of a touch-control sensing signal generator
In his embodiment can be it is multiple, such as represents can there is multiple touch-control sensing signal generators 12 in Fig. 2 with three stains), one join
Examine 13 and one processing module 14 of signal generator.
Signal generator 11 can be the signal generator with generation clock signal or AC signal, and above-mentioned clock pulse letter
Number can be 0 and signal that voltage cutting edge of a knife or a sword value is a fixed voltage for 0 and 1 signal or voltage dips.
Touch-control sensing signal generator 12 includes one first constant current source 121, a first switch 122, a second switch
123rd, one first touch pad 124 and a touch-control comparator 125.First constant current source 121 can provide one first constant current I1, the
One switch 122 is electrically connected at the first constant current source 121 and signal generator 11 with second switch 123, and first switch 122 is
PMOS switch, second switch 123 are NMOS switch.
First touch pad 124 is electrically connected at the first constant current source 121, first switch 122 and second switch 123, is used in combination
So that operating personnel carry out touch-control using a touch control object (such as finger, stylus etc. have electric contents), in addition, it is however generally that
First touch pad 124 has capacitance, and the first touch pad 124 is electrically connected at first switch via the first constant current source 121
122。
Touch-control comparator 125 has one first input point 1251 and one second input point 1252, and the first input point 1251 connects
One first reference voltage V1 is received, and the first reference voltage V1, depending on the design in practice, the second input point 1252 is electrically connected
In the first constant current source 121, first switch 122,123 and first touch pad 124 of second switch, specifically, the second input
Point 1252 is electrically connected at first switch 122 via the first constant current source 121.
Reference signal generator 13 includes one second constant current source 131, one the 3rd switch, 132, one the 4th switch 133, one
Second touch pad 134 and a reference comparator 135.Second constant current source 131 is to provide one second constant current I2, and second
The current value of constant current I2 is generally higher than the current value of the first constant current I1, and the multiple of the current value for the first constant current I1,
Specifically, above-mentioned multiple can be depending on the quantity according to touch-control sensing signal generator 12, such as when there are two touch-control sensings
Signal generator 12 may be set to 2 times, and three are then 3 times, and above-mentioned multiple can be touched according to the second touch pad 134 and first
The capacitance size of control pad determines that but it is not limited to this or 1.5 times of equimultiple relations, depending on the design of practice.Separately
Outside, can also make in other embodiment the second constant current I2 current value be less than the first constant current I1 current value, depending on practice it
Depending on design.
3rd switch 132 and the 4th switch 133 are electrically connected at the second constant current source 131 and signal generator 11, and the 3rd
Switch 132 is PMOS switch, and the 4th switch 133 is NMOS switch.Second touch pad 134 is electrically connected at the second constant current source
131st, the 3rd switch 132 (being specifically electrically connected at the 3rd switch 132 via the second constant current source 131) and the 4th switch
133, and charge for the second constant current I2, and the second touch pad 134 is one of a fixed capacity and a tunable capacitor person,
That is the second touch pad 134 is actually capacitance, but preferably is for adjusting capacitance, with the electricity with the second constant current I2
Flow valuve is arranged in pairs or groups mutually.
Reference comparator 135 has one the 3rd input point 1351 and one the 4th input point 1352, and the 3rd input point 1351 connects
Receive one second reference voltage V2, and the second reference voltage V2 is depending on the design in practice, such as the first ginseng can be greater than or equal to
Examine voltage V1.4th input point 1352 be electrically connected at the second constant current source the 131, the 3rd switch the 132, the 4th switch 133 and
Second touch pad 134, and the 4th input point 1352 is electrically connected at the 3rd switch 132 via the second constant current source 131.
Processing module 14 is electrically connected at touch-control comparator 125 and reference comparator 135, specifically, processing module
14 include one first latch unit 141, a controller 142 and digital delay 143, and the first latch unit 141 is electrically connected at tactile
Comparator 125 and reference comparator 135 are controlled, and (the D ends of the first latch unit 141 are electrical for D-type flip-flop for the first latch unit 141
Touch-control comparator 125 is connected to, CLK ends are electrically connected at reference comparator 135 through digital delay 143, and Q ends are electrically connected at
Controller 142).
Controller 142 is a microprocessing unit (Micro Control Unit, MCU) and digital signal processor
One of (Digital Signal Processor, DSP) person, is electrically connected at the first latch unit 141, and is electrically connected at ginseng
Examine comparator 135.
Specifically, controller 142 is electrically connected at reference comparator 135 via digital delay 143, digital delay
Device 143 includes at least one second latch unit 1431 (other embodiment can be multiple) and a multiplexer 1432.Second latch unit
1431 be D-type flip-flop, and is electrically connected at reference comparator 135 (D ends are electrically connected at reference comparator with controller 142
135, CLK ends are electrically connected at controller 142, and Q ends are electrically connected at multiplexer 1432).Multiplexer 1432 is electrically connected at ginseng
Comparator 135, the first latch unit 141, the second latch unit 1431 and controller 142 are examined, that is, receives reference comparator 135 simultaneously
With the input of the second latch unit 1431, so as to output to the first latch unit 141 (exporting to the CLK ends of the first latch unit 141) with
Controller 142.
In addition, need one to be mentioned that herein, and when digital delay 143 includes multiple second latch units 1431, second
The Q ends of latch unit 1431 are all the D ends inputs for being electrically connected to another latch unit, and controller 142 connects and is electrically connected at breech lock
The CLK ends of device, so as to controlling the time of delay.
The first touch pad 124 will be illustrated by touch-control with not by the situation of touch-control, first illustrating the first touch-control below respectively below
Pad 124 shows the touch-control sensing system of present pre-ferred embodiments also referring to Fig. 2 and Fig. 3, Fig. 3 by the situation of touch-control
The first touch pad by the waveform diagram of touch-control.As shown in the figure, signal generator 11 sends out an input for clock signal
Signal S1 (such as waveform of Fig. 3 the tops), the first switch 122 of touch-control sensing signal generator 12 and second switch 123 according to
It is turned on and off according to input signal S1 (that is, turn on or be not turned on).
Wherein, in the moment of first time t1, touch-control comparator 125 persistently exports one first low potential output signal S2,
And input signal S1 is down to low potential from high potential (High drops to Low) so that first switch 122 opens (conducting) and second opens
It closes 123 and closes (end and be not turned on), and when the first touch pad 124 is by touch-control, the first constant current I1 is to the first touch pad 124
Interior capacitance and touch-control charges in the touch control object (being assumed to be finger, can be considered capacitance) on the first touch pad 124, so that
The voltage of second input point 1252 of touch-control comparator 125 rise gradually (as in Fig. 3 as shown in upper several lower second oscillogram),
And when the voltage of the second input point 1252 reaches the first reference voltage V1, one first high electricity of the output of touch-control comparator 125 can be made
Position output signal S3 (as in Fig. 3 as shown in upper several lower 3rd oscillograms), and in present pre-ferred embodiments, second inputs
The voltage of point 1252 just reaches the first reference voltage V1 when one second time t2, therefore touch-control comparator 125 prolongs through one first
Slow time T1 is converted to from the first low potential output signal S2 exports the first high potential output signal S3, and this first time delay
T1 is the value of t2-t1.
In addition, input signal S1 can equally be sent to the 3rd switch 132 and the 4th switch of reference signal generator 13
133, similarly, in the moment of first time t1, reference comparator 135 persistently exports one second low potential output signal S4, and
Input signal S1 is down to low potential from high potential (High drops to Low) so that the 3rd switch 132 opens (conducting) and the 4th switch
133 close (end and be not turned on), the second constant current I2 in the second touch pad 134 capacitance charge so that with reference to than
Gradually rise compared with the voltage of the 4th input point 1352 of device 135 (as in Fig. 3 as shown in upper several lower 4th oscillograms), and when the
When the voltage of four input points 1352 reaches the second reference voltage V2, reference comparator 135 can be made to export the output of one second high potential
Signal S5 (as shown in the oscillogram of bottom in Fig. 3), and in present pre-ferred embodiments, the voltage of the 4th input point 1352
The second reference voltage V2 is just reached when the 4th time t3, therefore reference comparator 135 exports certainly through one the 3rd time delay T3
Second low potential output signal S4 is converted to output the second high potential output signal S5, and this 3rd time delay T3 is t3-t1
Value.
In addition, should be clear by Fig. 3, since the first touch pad 124 has by touch-control, the first I1 pairs of constant current
The charging of first touch pad 124 is slower so that the first time delay T1 is more than the 3rd time delay T3, and the present invention is preferably implemented
In example, it is necessary to the 3rd time delay T3 is made to be less than the first time delay T1, it can be by adjusting the of reference signal generator 13
Second constant current I2 of two constant current sources 131 and the capacitance of the second touch pad 134 reach this purpose.
Wherein, in present pre-ferred embodiments, processing module 14 is receiving the first high potential output signal S3 and the
After two high potentials output signal S5, it can be exported extremely according to one of the first time delay T1 and the 3rd time delay T3 the first difference
A few touch-control result S9.
Specifically, the first high potential output signal S3 is after exporting to the first latch unit 141, and the first latch unit 141 is first
Breech lock lives the first high potential and exports signal S3 without sending out, with etc. the second high potential to be received output signal S5 or include the
The signal of two high potentials output signal S5.
Furthermore, it is understood that after the second high potential output signal S5 is sent to the second latch unit 1431, the second latch unit 1431
It receives and one of goes out delayed control signal S6 transmitted by the second high potential output signal S5 and controller 142, so as to making controller 142
The second latch unit 1431 is controlled to export a delay output signal S7 (in general by low according to the second high potential output signal S5
The instantaneous trigger of current potential to high potential exports, therefore only needs control clock pulse), and above-mentioned delayed control signal S6 can make second
Latch unit 1431 lingeringly exports above-mentioned delay output signal S7.Multiplexer 1432 is transmitted in reception reference comparator 135
The second high potential output signal S5 and the delay output signal S7 that sends out of the second latch unit 1431, so as to handling and will
The one multiplexing processing signal S8 comprising the second high potential output signal S5 is sent to the first latch unit 141 and controller 142.
(equally can be the oscillogram as shown in Fig. 3 bottoms after the first latch unit 141 receives multiplexing processing signal S8
The signal from low potential to high potential, that is to say, that multiplexing processing signal S8 can be that the second high potential exports signal S5 actually,
Difference is to postpone output), the first high potential output signal S3 is directly directly output to controller 142 so that controller
142 can export an at least touch-control result S9 according to the first difference of the first time delay T1 and the 3rd time delay T3, and
In this explanation, touch-control result S9 is expressed as " having touch-control ", and when there is multiple touch-control sensing signal generators 12, is just had multiple
Touch-control result S9.
In addition, needing one to be mentioned that herein, in the above description, multiplexer 1432 is made to be delayed to a time delay t4 and just will
Multiplexing processing signal S8 is sent to the first latch unit 141 and controller 142, just cause controller 142 can direct basis first prolong
The first difference of slow time T1 and the 3rd time delay T3 is confirmed whether to have touch-control.And in other embodiments, due to can not
With digital delay 143, therefore reference comparator 135 is directly defeated by the second high potential output signal S3 in the 4th time t3
Go out to the first latch unit 141, and then make the first latch unit 141 directly by the first low potential output signal S2 (due at this time second
The voltage of input point 1252 is also not up to the first reference voltage V1, therefore the first low potential output signal S2 is low potential) output
To controller 142, and controller 142 understands that the first low potential output signal S2 is low potential, and the second high potential exports signal S3
For high potential, and then it can determine whether out that it is to have touch-control to represent at this time.
The first touch-control of the touch-control sensing system of present pre-ferred embodiments is shown also referring to Fig. 2 and Fig. 4, Fig. 4
Pad is not by the waveform diagram of touch-control.As shown in the figure, signal generator 11 equally sends out input signal S1 (such as Fig. 4 the tops
Waveform), and in the moment of first time t1, touch-control comparator 125 persistently exports one first low potential output signal S2, input
Signal S1 is down to low potential from high potential (High drops to Low) so that first switch 122 opens (conducting) and second switch 123
It closes (end and be not turned on), and when the first touch pad 124 is not by touch-control, the first constant current I1 is directly to the first touch pad
Capacitance in 124 charges so that the voltage of the second input point 1252 of touch-control comparator 125 rise gradually (in such as Fig. 4 by
Shown in upper several lower second oscillogram, and when rate of voltage rise is compared to by touch-control, comes soon), and when the second input point 1252
Voltage when reaching the first reference voltage V1, touch-control comparator 125 can be made to export the first high potential and export signal S3 (in such as Fig. 4
As shown in upper several lower 3rd oscillograms), and in present pre-ferred embodiments, the voltage of the second input point 1252 is when the 3rd
Between t5 when just reach the first reference voltage V1, therefore touch-control comparator 125 through one second time delay T2 export the first high potential
Signal S3 is exported, and this second time delay T2 is the value of t5-t1.
In addition, input signal S1 can equally be sent to the 3rd switch 132 and the 4th switch of reference signal generator 13
133, similarly, in the moment of first time t1, reference comparator 135 persistently exports one second low potential output signal S4, and
3rd switch 132 opens (conducting) and the 4th switch 133 closes (end and be not turned on), and the second constant current I2 is to the second touch pad
Capacitance in 134 charges so that the voltage of the 4th input point 1352 of reference comparator 135 rise gradually (in such as Fig. 3 by
Shown in upper several lower 4th oscillogram), and when the voltage of the 4th input point 1352 reaches the second reference voltage V2, touch-control can be made
Comparator 125 exports one second high potential output signal S3 (as shown in the oscillogram of bottom in Fig. 3), and of the invention preferable
In embodiment, the voltage of the 4th input point 1352 equally when the 4th time t3 (identical with the situation of Fig. 3) just reaches the second ginseng
Examine voltage V2, therefore reference comparator 135 exports the second high potential output signal S5 through the 3rd time delay T3, and this 3rd prolongs
The value that slow time T3 is t3-t1.
In addition, it should be clear by Fig. 4, since the first touch pad 124 is not by touch-control, the first I1 pairs of constant current
The charging of first touch pad 124 is very fast so that and the second time delay T2 is less than the 3rd time delay T3, and less than the first of Fig. 3
Time delay T1, and in present pre-ferred embodiments, it is necessary to the 3rd time delay T3 is made to be more than the second time delay T2, and the 3rd
Time delay T3, can be by adjusting the second constant current source 131 of reference signal generator 13 again smaller than the first time delay T1
The second constant current I2 and the capacitance of the second touch pad 134 reach this purpose.
Processing module 14, can be according to after the first low potential output signal S2 and the second high potential output signal S5 is received
According to one of the second time delay T2 and the 3rd time delay T3 the second difference, an at least touch-control result S9 is exported.
Specifically, the first high potential output signal S3 is after exporting to the first latch unit 141, and the first latch unit 141 is first
Breech lock lives the first high potential and exports signal S3 without sending out, with etc. the second high potential to be received output signal S5 or include the
The signal of two high potentials output signal S5.
Furthermore, it is understood that after the second high potential output signal S5 is sent to the second latch unit 1431, the second latch unit 1431
It receives and one of goes out delayed control signal S6 transmitted by the second high potential output signal S5 and controller 142, so as to making controller 142
The second latch unit 1431 is controlled to export a delay output signal S7 (in general by low according to the second high potential output signal S5
The instantaneous trigger of current potential to high potential exports, therefore only needs control clock pulse), and above-mentioned delayed control signal S6 can make second
Latch unit 1431 lingeringly exports above-mentioned delay output signal S7.Multiplexer 1432 is transmitted in reception reference comparator 135
The second high potential output signal S5 and the delay output signal S7 that sends out of the second latch unit 1431, so as to handling and will
The one multiplexing processing signal S8 comprising the second high potential output signal S5 is sent to the first latch unit 141 and controller 142.
It is directly that the first high potential output signal S2 is direct after the first latch unit 141 receives multiplexing processing signal S8
It exports to controller 142 so that controller 142 can come according to the second difference of the second time delay T2 and the 3rd time delay T3
An at least touch-control result S9 is exported, and in this explanation, touch-control result S9 is expressed as " not by touch-control ", and ought have multiple touch-control senses
During induction signal generator 12, multiple touch-control result S9 are just had.
In addition, needing one to be mentioned that herein, in the above description, it just will be more that multiplexer 1432 is made, which to be delayed to time delay t4,
Work processing signal S8 is sent to the first latch unit 141 and controller 142, just cause controller 142 can direct basis second postpone
The second difference of time T2 and the 3rd time delay T3 is confirmed whether to have touch-control.And in other embodiments, due to that can not have
There is digital delay 143, therefore reference comparator 135 directly exports the second high potential output signal S5 in the 4th time t3
To the first latch unit 141, and then make the first latch unit 141 that the first high potential directly be exported signal S3 (since second is defeated at this time
The voltage of access point 1252 has reached the first reference voltage V1) output is to controller 142, and controller 142 understands the first high potential
It is high potential to export signal S2, and the first high potential output signal S3 is high potential, and then can determine whether out that it is not touched to represent at this time
Control.
In addition, first switch 122 close and second switch 123 open and the 3rd switch 132 close and the 4th switch
Under 133 situations opened, the first touch pad 124 is made to discharge respectively with the second touch pad 134 respectively.
In summary it is described, after using touch-control sensing system provided by the present invention, due to using constant current source to touch-control
Pad electricity, therefore, can't cause the situation of swinging of signal with the variation of temperature or voltage, therefore touch-control is sentenced in practice
Break and be not easy to the situation of erroneous judgement and promote the stability of judgement.
Pass through the detailed description of more than preferred embodiment, it would be desirable to the feature and spirit of the present invention is more clearly described, and
Not it is any limitation as with above-mentioned disclosed preferred embodiment come the scope to the present invention.On the contrary, the purpose is to wish
The present invention that is arranged in that various changes can be covered and have equality is intended in the scope of the scope of the claims applied.
Claims (9)
1. a kind of touch-control sensing system, which is characterized in that include：
One signal generator, to generate an input signal；
An at least touch-control sensing signal generator, is electrically connected at the signal generator, and comprising：
One first constant current source, to provide one first constant current；
One first switch is electrically connected at first constant current source and the signal generator, to receive the input signal, so as to
It is turned on and off according to the input signal；
One second switch is electrically connected at first constant current source and the signal generator, to receive the input signal, so as to
It is turned on and off according to the input signal；
One first touch pad is electrically connected at first constant current source and the second switch, first touch pad via this first
Constant current source is electrically connected at the first switch, and to touch-control；And
One touch-control comparator, has one first input point and one second input point, which receives one first with reference to electricity
Pressure, second input point are electrically connected at first constant current source, the second switch and first touch pad, second input
Point is electrically connected at the first switch via first constant current source, to export one first low potential output signal；It is defeated at this
Entering signal opens the first switch in a first time and closes the second switch, and when first touch pad is by touch-control,
First constant current to first touch pad charge, make the touch-control comparator through one first time delay and in one second time from
First low potential output signal is converted to output one first high potential output signal；Make at the first time in this in the input signal
The first switch opens and closes the second switch, and when first touch pad is not by touch-control, first constant current to this
One touch pad charges, and makes the touch-control comparator through one second time delay and exports and believe from first low potential in one the 3rd time
It number is converted to and to export first high potential output signal；
One reference signal generator, comprising：
One second constant current source, to provide one second constant current；
One the 3rd switch, is electrically connected at second constant current source and the signal generator, to receive the input signal, so as to
It is turned on and off according to the input signal；
One the 4th switch, is electrically connected at second constant current source and the signal generator, to receive the input signal, so as to
It is turned on and off according to the input signal；
One second touch pad, be electrically connected at second constant current source with the 4th switch, second touch pad via this second
Constant current source is electrically connected at the 3rd switch, and supplies second constant-current charge；And
One reference comparator, has one the 3rd input point and one the 4th input point, and the 3rd input point receives one second with reference to electricity
Pressure, the 4th input point are electrically connected at second constant current source, the 4th switch and second touch pad, the 4th input
Point is electrically connected at the 3rd switch via second constant current source, to export one second low potential output signal；It is defeated at this
Enter signal in this make at the first time the 3rd switch open and make the 4th switch close when, second constant current to this second touch
Control pad charges, and makes the reference comparator through one the 3rd time delay and turns in one the 4th time from second low potential output signal
It is changed to output one second high potential output signal；And
One processing module is electrically connected at the touch-control comparator and the reference comparator, defeated to receive second high potential
Go out signal, and one of signal person is exported with first high potential to receive first low potential output signal, so as to foundation
First low potential output signal exports one of signal person with first high potential and second high potential output signal is defeated
Go out an at least touch-control result；
Wherein, which was more than for the 3rd time delay, which was less than for the 3rd time delay.
2. touch-control sensing system as described in claim 1, which is characterized in that the first switch is a PMOS with the 3rd switch
Switch, the second switch are a NMOS switch with the 4th switch.
3. touch-control sensing system as described in claim 1, which is characterized in that second touch pad is a fixed capacity and one
One of tunable capacitor person.
4. touch-control sensing system as described in claim 1, which is characterized in that the current value of second constant current be more than this first
The current value of constant current, and the multiple of the current value for first constant current.
5. touch-control sensing system as described in claim 1, which is characterized in that the processing module includes：
One first latch unit is electrically connected at the touch-control comparator and the reference comparator, defeated to receive first low potential
Go out signal and export one of signal person with first high potential, and it is defeated according to second high potential that the reference comparator exports
Going out signal controls first low potential output signal to export signal output with first high potential；And
One controller is electrically connected at first latch unit and the reference comparator, to receive first low potential output letter
Number with first high potential output one of signal person and second high potential output signal, it is and defeated according to first low potential
Go out signal and export one of signal person and a second high potential output signal output at least touch-control knot with first high potential
Fruit.
6. touch-control sensing system as claimed in claim 5, which is characterized in that the controller is believed for a microprocessing unit and number
One of number processor person.
7. touch-control sensing system as claimed in claim 5, which is characterized in that the processing module further includes a digital delay,
The digital delay is electrically connected between the reference comparator, first latch unit and the controller, to receive this
Two high potentials export signal, and first low potential is exported so as to triggering first latch unit according to second high potential output signal
It exports signal and exports one of signal person with first high potential, and second high potential is exported into signal output to the control
Device.
8. touch-control sensing system as claimed in claim 7, which is characterized in that the digital delay includes：
At least one second latch unit, is electrically connected at the reference comparator and the controller, defeated to receive second high potential
Go out one of transmitted by signal and the controller to go out delayed control signal, so as to the controller is made to control second latch unit according to should
Second high potential exports one delay output signal of signal output；And
One multiplexer is electrically connected at the reference comparator, first latch unit, second latch unit and the controller, to
It receives second high potential that the reference comparator transmits and exports the delay that signal and second latch unit are sent out
Output signal, so as to a multiplexing processing signal comprising second high potential output signal is sent to first latch unit with being somebody's turn to do
Controller.
9. touch-control sensing system as claimed in claim 8, which is characterized in that first latch unit is D with second latch unit
Type flip-flop.
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| CN105610422A (en) | 2016-05-25 |
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