CN102609142B - Contact panel and antinoise unit and method for processing noise - Google Patents

Contact panel and antinoise unit and method for processing noise Download PDF

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Publication number
CN102609142B
CN102609142B CN201210029896.7A CN201210029896A CN102609142B CN 102609142 B CN102609142 B CN 102609142B CN 201210029896 A CN201210029896 A CN 201210029896A CN 102609142 B CN102609142 B CN 102609142B
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switch
signal
filter circuit
electrically
circuit
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CN201210029896.7A
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Chinese (zh)
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CN102609142A (en
Inventor
林雨霆
王俊杰
龙识元
方嘉骏
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福建华映显示科技有限公司
中华映管股份有限公司
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Abstract

A kind of contact panel, including display module, produces a noise;Touch sensor, is arranged on above display module, and output abnormality signal, and wherein abnormal signal includes noise and sensor signal;Antinoise unit, after receiving abnormal signal, can form sensor signal by the noise filtering in abnormal signal;And signal processing unit, in order to process sensor signal.The contact panel with antinoise unit of the present invention is not necessary to adjust the situation of the algorithm solution wrong report touch points of Analog-digital Converter frequency or microcontroller process signal, it is to avoid extend sensor signal to the process time passing to operating system from touch sensor.

Description

Contact panel and antinoise unit and method for processing noise

Technical field

The invention relates to a kind of contact panel and antinoise unit and method for processing noise, can antimierophonic contact panel in particular to one.

Background technology

The rapid technological improvement that contact panel is relevant in recent years, such as electric resistance touch-control panel, capacitance type touch-control panel, acoustic wave contact panel and optical touch control panel, it is widely used on communication product, computer installation and consumption electronic products, the convenience on using the usefulness that the electronic product applied is significantly increased and using.

And capacitor-type touch panel can input with finger, there is the facility of input operation, and its input operation does not need through pressing, will not allow panel have bear repeatedly touch stress, deformation and cause infringement shortcoming, and the composition simple structure of this kind of touch pad, assembly are few, product yield is high, is suitable for producing to reduce cost in a large number.

Fig. 1 is the basic framework figure of known touch sensor (touchsensor) 100.By an optical cement (opticallyclearadhesive between a glass substrate 110 and an indium tin oxide layer 130;OCA) 120 and engage, and at this indium tin oxide layer (indiumtinoxide;ITO) 130 and one engaged by another optical cement 120 between protection glass (coverlens) 140, to complete this touch sensor 100.

Fig. 2 is the basic framework figure of known contact panel (touchpanel) 200.One touch sensor 100 is configured at a LCD MODULE (LCDModule;LCM) above in the of 250, to complete this contact panel 200.Citing, the glass substrate 110 of touch sensor 100 is engaged in this LCD MODULE 250, and has an air gap 260 between this LCD MODULE 250 and this glass substrate 110.

Fig. 3 is the square Organization Chart of the signal process of known contact panel.Capacitance variation when one touch sensor 100 can sense because of touching and export analog signal (sensorIOsignal) and simulate multiplexer (analogmultiplexer) 320 to one.The analog signal scanned, via the action of scanning, is exported to an analog-digital converter 330 by this simulation multiplexer 320.This analog signal is converted to digital signal and deals with and output control signal to a microcontroller 340 by this analog-digital converter 330.Finally, then through by a coffret 350, control signal is passed to an operating system 360 to do computing to judge touch points position.

But, at touch sensor after costing LCD MODULE, touch sensor can be subject to the interference of the noise that LCD MODULE is brought and easily cause the situation of wrong report touch points, this noise Producing reason is that the common voltage (Vcom) of LCD MODULE is subject to the impact of data line (sourceline) coupling (couple) and causes the situation of instability, particularly in heavy duty picture or the situation that can cause instability when quickly updating picture.At present, the general practice is adjust firmware (firmware) to go to solve the situation of wrong report touch points, such as adjust Analog-digital Converter frequency or the algorithm etc. of microcontroller process signal, but this practice all can extend the process time that sensor signal sends to from touch sensor operating system.

Therefore, just there is a need to provide a kind of antimierophonic contact panel, it is possible to solve aforesaid problem.

Summary of the invention

The present invention provides a kind of contact panel, including display module, produces a noise;Touch sensor, is arranged on above display module, and output abnormality signal, and wherein abnormal signal includes noise and sensor signal;Antinoise unit, after receiving abnormal signal and noise, can form sensor signal by the noise filtering in abnormal signal;And signal processing unit, in order to process sensor signal.

Feature of this invention is that: a kind of antinoise unit for contact panel, this contact panel includes a touch sensor and a display module, this display module produces a noise, this touch sensor exports an abnormal signal, this abnormal signal includes this noise and a sensor signal, it is characterized in that, this antinoise unit includes:

One first filter circuit, receives this abnormal signal, and allow one more than a reference voltage this abnormal signal by and form one first filtering signal;

One second filter circuit, receives this noise, and allow more than this reference voltage this noise by and form one second filtering signal;And

One comparison circuit, in order to receive this first filtering signal and second filtering signal, and compare this first and second filtering signal and export one and compare signal, wherein this compares signal is this sensor signal.

It is another feature that: a kind of contact panel, it is characterised in that: including:

One display module, produces a noise;

One touch sensor, is arranged on above this display module, and exports an abnormal signal, and wherein this abnormal signal includes this noise and a sensor signal;

Primary antibodie element of noise, after receiving this abnormal signal and this noise, can form this sensor signal by this noise filtering in this abnormal signal;And

One signal processing unit, in order to process this sensor signal.

The present invention also has one to be characterised by: a kind of method for processing noise for contact panel, this contact panel includes a touch sensor and a display module, this display module produces a noise, this touch sensor exports an abnormal signal, this abnormal signal includes this noise and a sensor signal, comprises the following steps:

Receive this abnormal signal, and allow to pass through more than this abnormal signal of a reference voltage, form one first filtering signal;

Receive this noise, and allow to pass through more than this noise of this reference voltage, form one second filtering signal;And

Receiving this first filtering signal and this second filtering signal, and compare mutually this first filtering signal and this second filtering signal, compare signal according to comparative result output one, wherein this compares signal is this sensor signal.

Advantages of the present invention: the high levle of the normal induction signal that comparison signal is touch sensor that the comparison circuit of the antinoise unit of the present invention exports or low level, that is the noise filtering in abnormal signal can be formed a normal induction signal by the antinoise unit of the present invention really, without the interference of noise that LCD MODULE brings occurring and causing the situation of wrong report touch points.Therefore, the contact panel with antinoise unit of the present invention is not necessary to adjust the situation of the algorithm solution wrong report touch points of Analog-digital Converter frequency or microcontroller process signal, it is to avoid extend sensor signal to the process time passing to operating system from touch sensor.

Accompanying drawing explanation

Fig. 1 is the basic framework figure of known touch sensor;

Fig. 2 is the basic framework figure of known contact panel;

Fig. 3 is the square Organization Chart of the signal process of known contact panel;

Fig. 4 is the square Organization Chart of the contact panel with antinoise unit of one of present invention embodiment;

Fig. 5 is the square Organization Chart of the contact panel with antinoise unit of one of present invention embodiment;

Fig. 6 is the circuit diagram of the noise processed unit of one of present invention embodiment;

Fig. 7 is the method for processing noise flow chart for contact panel of the embodiment of the present invention;And

Fig. 8 is the abnormal signal of the present invention, the first filtering signal, common voltage coupling signal, the second filtering signal and the sequential chart comparing signal.

Wherein: 100,410 touch sensor

110 glass substrates

120 optical cements

130 indium tin oxide layers

140 protection glass

200,400 contact panel

250 LCD MODULE

260 air gaps

320,520 simulation multiplexer

330,530 analog-digital converter

340,540 microcontroller

350,550 coffret

360,560 operating system

420 antinoise unit

430 signal processing units

450 display modules

610 first filter circuits

620 second filter circuits

630 comparison circuits

640 abnormal signals

650 common voltage coupling signals

660 first filtering signals

670 second filtering signals

680 compare signal

Q10 first switchs

Q20 second switch

Q30 the 3rd switchs

Q40 the 4th switchs

Q50 the 5th switchs

Q60 the 6th switchs

Q70 the 7th switchs

Q80 the 8th switchs

Q90 the 9th switchs

Q100 the tenth switchs

Q11, Q21, Q31, Q41, Q51 first end

Q61, Q71, Q81, Q91, Q101 first end

Q12, Q22, Q32, Q42, Q52 second end

Q62, Q72, Q82, Q92, Q102 second end

Q13, Q23, Q33, Q43, Q53 control end

Q63, Q73, Q83, Q93, Q103 control end

IC1 the first operational amplifier

IC2 the second operational amplifier

IC3 the 3rd operational amplifier

IC4 four-operational amplifier

S700 ~ S740 step.

Detailed description of the invention

Fig. 4 is the square Organization Chart of the contact panel 400 with antinoise unit of one of present invention embodiment.One touch sensor (touchsensor) 410 is arranged on display module 450 (such as LCD MODULE) top.When this touch sensor 410 exports a sensor signal, this sensor signal becomes an abnormal signal (that is abnormal signal includes normal induction signal and noise) because of noise (such as common voltage coupling signal) impact produced by this display module 450.This abnormal signal can be passed to primary antibodie element of noise (anti-noiseunit) 420 by this touch sensor 410.After this antinoise unit 420 receives this abnormal signal of this touch sensor 410, the noise filtering in abnormal signal can be formed a normal induction signal, and this normal induction signal is passed to a signal processing unit 430.This signal processing unit 430, in order to process this normal induction signal.

Refer to Fig. 5, specifically, this signal processing unit 430 can include simulation multiplexer 520, analog-digital converter 530, microcontroller 540, coffret 550 and an operating system 560.Touch sensor 410 can export a sensor signal originally, but being subject to the noise of LCD MODULE, touch sensor 410 can export an abnormal signal (including sensor signal and noise) on the contrary to simulation multiplexer (analogmultiplexer) 520.The abnormal signal scanned, via the action of scanning, is exported to this antinoise unit 420 by this simulation multiplexer 520.This abnormal signal is become normal induction signal to analog-digital converter (analogtodigitalconverter by this antinoise unit 420;ADC) 530.This analog-digital converter 530 is converted this normal induction signal to digital signal to microcontroller (micro-controllerunit by analog signal;MCU) 540 deal with and output control signal.Finally, then through by coffret (interface) 550, control signal is passed to operating system (operatingsystem;OS) 560 do computing, to judge touch points position.Such as, because of touching capacitance variation time causes sensor signal to change and computing touch points position.

Refer to Fig. 6, for the circuit diagram of the antinoise unit 420 of one of present invention embodiment.This antinoise unit 420 includes one first filter circuit 610,1 second filter circuit 620 and a comparison circuit 630.This first filter circuit 610 includes one first operational amplifier IC1, one first switch Q10, a second switch Q20 and one the 3rd switch Q30.One normal phase input end of this first operational amplifier IC1 receives a reference voltage, and a negative-phase input receives an abnormal signal 640 (abnormal signal that touch sensor 410 exports).This abnormal signal 640 and reference voltage are compared by this first operational amplifier IC1, and export comparative result at its outfan.This first switch Q10 includes one first end Q11, one second end Q12 and one and controls end Q13.First end Q11 receives this abnormal signal 640.Second end Q12 output one first filtering signal 660.This control end Q13 is electrically connected at this outfan of this first operational amplifier IC1, and by this first operational amplifier IC1 comparison signal exported, whether this first end Q11 and this second end Q12 to control this first switch Q10 turn on.This second switch Q20 includes one first end Q21, one second end Q22 and one and controls end Q23.This first end Q21 is electrically connected at this second end Q12 of this first switch Q10.This second end Q22 is electrically connected at this reference voltage.This control end Q23 is electrically connected at this outfan of this first operational amplifier IC1, by this first operational amplifier IC1 comparison signal exported, in order to control whether this first end Q21 and this second end Q22 turns on.3rd switch Q30 includes one first end Q31, one second end Q32 and one and controls end Q33.This first end Q31 is electrically connected at this second end Q12 of this first switch Q10.This second end Q32 is electrically connected at this reference voltage.This control end Q33 receives this abnormal signal 640, by this abnormal signal 640 in order to control whether this first end Q31 and this second end Q32 turns on.

This second filter circuit 620 includes one second operational amplifier IC2, one the 4th switch Q40, one the 5th switch Q50 and one the 6th switch Q60.One normal phase input end of this second operational amplifier IC2 receives this reference voltage, one negative-phase input receives a common voltage coupling signal (Vcomcouplesignal) 650 (common voltage coupling signal 650 refers to that common voltage is subject to the impact of data wire coupling and causes), this common voltage coupling signal 650 and reference voltage are compared by this second operational amplifier IC2, and export comparative result at its outfan.4th switch Q40 includes one first end Q41, one second end Q42 and one and controls end Q43.First termination receives this common voltage coupling signal 650.This second end Q42 output one second filtering signal 670.This control end Q43 is electrically connected at this outfan of this second operational amplifier IC2, and by the comparison signal of the output of this second operational amplifier IC2, whether this first end Q41 and this second end Q42 to control the 4th switch Q40 turn on.5th switch Q50 includes one first end Q51, one second end Q52 and one and controls end Q53.This first end Q51 is electrically connected at this second end Q42 of the 4th switch Q40.This second end Q52 is electrically connected at this reference voltage.This control end Q53 is electrically connected at this outfan of this second operational amplifier IC2, by this second operational amplifier IC2 comparison signal exported, to control whether this first end Q51 and this second end Q52 turns on.6th switch Q60 includes one first end Q61, one second end Q62 and one and controls end Q63.First end Q61 is electrically connected at this second end Q42 of the 4th switch Q40.Second end Q62 is electrically connected at this reference voltage.This control end Q63 receives this common voltage coupling signal 650, by this common voltage coupling signal 650 to control whether this first end Q61 and this second end Q62 turns on.

This comparison circuit 630 includes one the 3rd operational amplifier IC3, a four-operational amplifier IC4, one the 7th switch Q70, one the 8th switch Q80, one the 9th switch Q90 and 1 the tenth switch Q100.One normal phase input end of the 3rd operational amplifier IC3 receives this first filtering signal 660 of this first filter circuit 610, one negative-phase input receives this second filtering signal 670 of this second filter circuit 620, after 3rd operational amplifier, this first filtering signal 660 and this second filtering signal 670 are compared by IC3, and export comparative result at its outfan.One negative-phase input of this four-operational amplifier IC4 receives this first filtering signal 660 of this first filter circuit 610, one normal phase input end receives this second filtering signal 670 of this second filter circuit 620, this first filtering signal 660 and this second filtering signal 670 are compared by this four-operational amplifier IC4, and export comparative result at its outfan.7th switch Q70 includes one first end Q71, one second end Q72 and one and controls end Q73.This control end Q73 is electrically connected this outfan of this four-operational amplifier IC4, by this four-operational amplifier IC4 comparison signal exported, to control whether this first end Q71 and this second end Q72 turns on.8th switch Q80 includes one first end Q81, one second end Q82 and one and controls end Q83.This first end Q81 is electrically connected at this second end Q72 of the 7th switch Q70.This second end Q82 is electrically connected at this reference voltage.This control end Q83 is electrically connected this outfan of the 3rd operational amplifier IC3, by the 3rd operational amplifier IC3 comparison signal exported, to control whether this first end Q81 and this second end Q82 turns on.9th switch Q90 includes one first end Q91, one second end Q92 and one and controls end Q93.This first end Q91 is electrically connected at the high levle signal high levle of normal induction signal of touch sensor 410 (the high levle signal refer to).The electrical Q92 of this second end is connected to this first end Q71 of the 7th switch Q70, and compares signal 680 in order to export this.This control end Q93 is electrically connected at this outfan of the 3rd fortune amplifier IC3, by the comparison signal of the output of the 3rd operational amplifier IC3, to control whether this first end Q91 and this second end Q92 turns on.Tenth switch Q10 includes one first end Q101, one second end Q102 and one and controls end Q103.This first end Q101 is electrically connected at this second end Q92 of the 9th switch Q90, and compares signal 680 in order to export this.This second end Q102 is electrically connected at this reference voltage.This control end Q103 is electrically connected at this outfan of this four-operational amplifier IC4, by the comparison signal of the output of this four-operational amplifier IC4, in order to control whether this first end Q101 and this second end Q102 turns on.

In above-mentioned, the first switch Q10, the 3rd switch Q30, the 4th switch Q40, the 6th switch Q60, the 7th switch Q70 and the 8th switch Q80 are p type field effect transistor, and second switch Q20, the 5th switch Q50, the 9th switch Q90 and the tenth switch Q100 are n type field effect transistor.This reference voltage is defined as the low level signal low level of normal induction signal of touch sensor 410 (the low level signal refer to), for instance zero volt.The high levle of the normal induction signal that comparison signal 680 is touch sensor that comparison circuit 630 exports or low level, also can form a normal induction signal by the noise filtering in abnormal signal.

Fig. 7 is the method for processing noise flow chart for contact panel of embodiments of the invention.Refer again to Fig. 6, this first filter circuit 610 receives this abnormal signal 640 and this second filter circuit 620 receives a common voltage coupling signal 650 (step S700).This first filter circuit 610 allow more than reference voltage this abnormal signal 640 by and formed one first filtering signal 660, and by this first filtering signal 660 pass to a comparison circuit 630;And this second filter circuit 620 allow more than this reference voltage this common voltage coupling signal 650 by and formed one second filtering signal 670, and by this second filtering signal 670 pass to this comparison circuit 630 (step S710).This comparison circuit 630 is in order to receive the first filtering signal 660 and the second filtering signal 670, and compares the first filtering signal 660 and the second filtering signal 670 and export one and compare signal 680.Such as, this comparison circuit 630 judges that whether this first filtering signal 660 is more than this second filtering signal 670 (step S720), if this filtering signal 610 is more than this second filtering signal 620, just output one high levle signal (step S730), otherwise just exports a low level signal (step S740).

Fig. 8 is the abnormal signal of the present invention, the first filtering signal, common voltage coupling signal, the second filtering signal and the sequential chart comparing signal.Four kinds of situations can be divided into: the first situation (A) is all positive voltage signal for abnormal signal and common voltage coupling signal, and abnormal signal is more than common voltage coupling signal from the positive and negative situation of the signal of abnormal signal and common voltage coupling signal.The second situation (B) is positive voltage signal for abnormal signal, and common voltage coupling signal is negative voltage signal, and abnormal signal is more than common voltage coupling signal.The third situation (C) is all positive voltage signal for abnormal signal and common voltage coupling signal, and abnormal signal is less than common voltage coupling signal.4th kind of situation (D) is all negative voltage signal for abnormal signal and common voltage coupling signal, and abnormal signal is more than common voltage coupling signal.In detail, refer again to Fig. 6 and Fig. 8.In the present embodiment, the signal of the action of the circuit of noise processed unit and each point.When the first situation (A), first operational amplifier IC1 and the second operational amplifier IC2 all can export low level signal, second switch Q20, 3rd switch Q30, 5th switch Q50 and the 6th switch Q60 is not turned on, first switch Q10 turns on and exports the first filtering signal 660 to the 3rd operational amplifier IC3, 4th switch Q40 turns on and exports the second filtering signal 670 to four-operational amplifier IC4, now the first filtering signal 660 filters signal 670 more than second, so the 3rd operational amplifier can export high levle signal, four-operational amplifier IC4 can export low level signal, then the 7th switch conduction Q70, 8th switch Q80 and the tenth switch Q100 is not turned on, the comparison signal 680 that now the 9th switch Q90 turns on and exports is high levle signal.

When the second situation (B), first operational amplifier IC1 can export low level signal, second operational amplifier IC2 can export high levle signal, second switch Q20, 3rd switch Q30 and the 4th switch Q40 is not turned on, first switch Q10 turns on and exports the first filtering signal 660 to the 3rd operational amplifier IC3, 5th switch Q50 and the 6th switch Q60 turns on and exports no-voltage level to four-operational amplifier IC4, now the first filtering signal 660 is more than no-voltage level signal, so the 3rd operational amplifier IC3 exports high levle signal, four-operational amplifier IC4 exports low level signal, then the 7th switch Q70 conducting, 8th switch Q80 and the tenth switch Q100 is not turned on, the comparison signal 680 that now the 9th switch Q90 turns on and exports is high levle signal.

When the third situation (C), first operational amplifier IC1 and the second operational amplifier IC2 all can export low level signal, second switch Q20, 3rd switch Q30, 5th switch Q50 and the 6th switch Q60 is not turned on, first switch Q10 turns on and exports the first filtering signal 660 to the 3rd operational amplifier IC3, 4th switch Q40 turns on and exports the second filtering signal 670 to four-operational amplifier IC4, now the first filtering signal 660 filters signal 670 less than second, so the 3rd operational amplifier IC3 can export low level signal, four-operational amplifier IC4 can export high levle signal, then the 8th switch Q80 conducting, but the 7th switch Q70 and the 9th switch Q90 is not turned on, the low level signal that comparison signal 680 is no-voltage that now the tenth switch Q100 turns on and exports.

When the 4th kind of situation (D), first operational amplifier IC1 and the second operational amplifier IC2 all can export high levle, 3rd switch Q30 and the 6th switch Q60 all turns on and exports no-voltage level, first switch Q10 and the 4th switch Q40 is not turned on, second switch Q20 turns on and exports no-voltage level to the 3rd operational amplifier IC3, 5th switch Q50 turns on and exports no-voltage level to four-operational amplifier IC4, because now the positive-negative input end of the 3rd operational amplifier IC3 and four-operational amplifier IC4 is all the low level signal of no-voltage, so the 3rd operational amplifier IC3 and four-operational amplifier IC4 is output as all low voltage level, then the 9th switch Q90 and the tenth switch Q100 is all not turned on, 8th switch Q80 conducting, the low level signal that comparison signal 680 is no-voltage that now the 7th switch Q70 turns on and exports.

When above-mentioned four kinds of situation (A), (B), (C) and (D), the high levle of the normal induction signal that comparison signal is touch sensor that the comparison circuit of the antinoise unit of the present invention exports or low level, that is the noise filtering in abnormal signal can be formed a normal induction signal by the antinoise unit of the present invention really, without the interference of noise that LCD MODULE brings occurring and causing the situation of wrong report touch points.Therefore, the contact panel with antinoise unit of the present invention is not necessary to adjust the situation of the algorithm solution wrong report touch points of Analog-digital Converter frequency or microcontroller process signal, it is to avoid extend sensor signal to the process time passing to operating system from touch sensor.

In sum, it is that only notebook invents embodiment or the embodiment for presenting the technological means that solution problem adopts, is not used for limiting the scope of patent working of the present invention.Namely all be consistent with present patent application scope context, or the impartial change done according to the scope of the claims of the present invention with modify, be all the scope of the claims of the present invention and contained.

Claims (2)

1. the antinoise unit for contact panel, this contact panel includes a touch sensor and a display module, this display module produces a noise, this touch sensor exports an abnormal signal, this abnormal signal includes this noise and a sensor signal, it is characterized in that, this antinoise unit includes:
One first filter circuit, receives this abnormal signal, and allow one more than a reference voltage this abnormal signal by and form one first filtering signal:
One second filter circuit, receive this noise, and allow more than this reference voltage this noise by and form one second filtering signal: an and comparison circuit, in order to receive this first filtering signal and the second filtering signal, and compare this first and second filtering signal and export one and compare signal, wherein this compares signal is this sensor signal:
Wherein this first filter circuit includes:
One first filter circuit comparator, a normal phase input end of this comparator receives this reference voltage, and a negative-phase input receives this abnormal signal, and this abnormal signal and this reference voltage are compared by this comparator, and exports comparative result at its outfan:
One first filter circuit first switchs, including:
First end of one first filter circuit the first switch, receives this abnormal signal;Second end of one first filter circuit the first switch, exports this first filtering signal: and
The control end of one first filter circuit the first switch, is electrically connected at this outfan of this first filter circuit comparator, and whether the second end of the first end and first filter circuit the first switch in order to control this first filter circuit the first switch turns on;
One first filter circuit second switch, including:
First end of one first filter circuit second switch, is electrically connected at the second end of first filter circuit the first switch: the second end of one first filter circuit second switch, is electrically connected at this reference voltage;And
The control end of one first filter circuit second switch, is electrically connected at the outfan of this first filter circuit comparator, and whether the second end of the first end and this first filter circuit second switch in order to control this first filter circuit second switch turns on;
And one first filter circuit the 3rd switch, including:
First end of the first filter circuit the 3rd switch, is electrically connected at the second end of this first filter circuit second switch: the second end of one first filter circuit the 3rd switch, is electrically connected at this reference voltage;And
The control end of one first filter circuit the 3rd switch, receives this abnormal signal, and whether the second end of the first end and this first filter circuit second switch in order to control this first filter circuit the 3rd switch turns on;
Wherein this second filter circuit includes:
One second filter circuit comparator, a normal phase input end of this comparator receives this reference voltage, and a negative-phase input receives this noise, and this noise and this reference voltage are compared by this second filter circuit comparator, and exports comparative result at its outfan:
One second filter circuit first switchs, including:
First end of one second filter circuit the first switch, receives this noise;
Second end of one second filter circuit the first switch, exports this second filtering signal;And
The control end of one second filter circuit the first switch, is electrically connected at the outfan of this second filter circuit comparator, and whether the second end of the first end and this second filter circuit the first switch in order to control this second filter circuit the first switch turns on;
One second filter circuit second switch, including:
First end of one second filter circuit second switch, is electrically connected at the second end of this second filter circuit the first switch;
Second end of one second filter circuit second switch, is electrically connected at this reference voltage;And
First end of one second filter circuit second switch controls end, is electrically connected at this second filter circuit comparator output terminal, and whether the second end of the first end and this second filter circuit second switch in order to control the second filter circuit second switch turns on;
And one second filter circuit the 3rd switch, including:
First end of one second filter circuit the 3rd switch, is electrically connected at the second end of this second filter circuit the first switch:
Second end of one second filter circuit the 3rd switch, is electrically connected at this reference voltage;And
The control end of one second filter circuit the 3rd switch, receives this noise, and whether the second end of the first end and this second filter circuit the 3rd switch in order to control this second filter circuit the 3rd switch turns on;
Wherein this comparison circuit includes:
One first comparator, one normal phase input end of this comparator receives one first filtering signal of one first filter circuit, one negative-phase input receives one second filtering signal of one second filter circuit, this first filtering signal and this second filtering signal are compared by this first comparator, and export comparative result at its outfan;
One second comparator, one negative-phase input of this comparator receives this first filtering signal, one normal phase input end receives this second filtering signal, and this first filtering signal and this second filtering signal are compared by this second comparator, and export comparative result at its outfan:
One comparison circuit first switchs, including: the first end of comparison circuit first switch;
First end the second end of one comparison circuit the first switch;And the control end of comparison circuit first switch, it is electrically connected this outfan of this second comparator, whether the second end of the first end and this comparison circuit the first switch in order to control this comparison circuit the first switch turns on;
One comparison circuit second switch, including:
One comparison circuit second switch the first end, is electrically connected at the second end of this comparison circuit the first switch: comparison circuit second switch second end, is electrically connected at this reference voltage;And
The control end of one comparison circuit second switch, is electrically connected this outfan of this first comparator, and whether the second end of the first end and this comparison circuit second switch in order to control this comparison circuit second switch turns on;
One comparison circuit the 3rd switch, including:
First end of one comparison circuit the 3rd switch, is electrically connected at a high levle signal;Second end of one comparison circuit the 3rd switch, is electrically connected at the first end of this comparison circuit the first switch, and compares signal in order to export this: and
One comparison circuit the 3rd switch control terminal, is electrically connected at this outfan of the first operational amplifier, and whether the second end of the first end and this comparison circuit the 3rd switch in order to control this comparison circuit the 3rd switch turns on;And
One comparison circuit the 4th switch, including:
First end of one comparison circuit the 4th switch, is electrically connected at the second end of this comparison circuit the 3rd switch;Second end of one comparison circuit the 4th switch, is electrically connected at this reference voltage;And
The control end of one comparison circuit the 4th switch, is electrically connected at this outfan of the second operational amplifier, and whether the second end of the first end and this comparison circuit the 4th switch in order to control this comparison circuit the 4th switch turns on.
2. the antinoise unit for contact panel according to claim 1, it is characterised in that method for processing noise comprises the following steps:
Receive this abnormal signal, and allow to pass through more than this abnormal signal of reference voltage, form the first filtering signal: receive this noise, and allow to pass through more than this noise of this reference voltage, form one second filtering signal: and receive this first filtering signal and this second filtering signal, and compare mutually this first filtering signal and this second filtering signal, and compare signal according to comparative result output one, wherein this compares signal is this sensor signal;Wherein this noise is that a common voltage condenses signal, and this common voltage condenses signal and refers to that a common voltage is subject to a data wire and does the impact of conjunction and cause;
When this first filtering signal is more than this second filtering signal, export a high levle signal: when this first filtering signal is equal to or less than this second filtering signal, export a low level signal.
CN201210029896.7A 2012-02-10 2012-02-10 Contact panel and antinoise unit and method for processing noise CN102609142B (en)

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CN201210029896.7A CN102609142B (en) 2012-02-10 2012-02-10 Contact panel and antinoise unit and method for processing noise

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