CN102609142A - Touch panel, anti-noise unit and noise treatment method - Google Patents

Touch panel, anti-noise unit and noise treatment method Download PDF

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Publication number
CN102609142A
CN102609142A CN2012100298967A CN201210029896A CN102609142A CN 102609142 A CN102609142 A CN 102609142A CN 2012100298967 A CN2012100298967 A CN 2012100298967A CN 201210029896 A CN201210029896 A CN 201210029896A CN 102609142 A CN102609142 A CN 102609142A
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China
Prior art keywords
signal
filtering
noise
switch
electrically
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CN2012100298967A
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Chinese (zh)
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CN102609142B (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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Priority to CN201210029896.7A priority Critical patent/CN102609142B/en
Publication of CN102609142A publication Critical patent/CN102609142A/en
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Publication of CN102609142B publication Critical patent/CN102609142B/en

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Abstract

A touch panel comprises a display module, a touch sensor, an anti-noise unit and a signal processing unit. The display module produces a noise, the touch sensor is arranged above the display module and outputs abnormal signals comprising noise and induction signals, after receiving the abnormal signals, the anti-noise unit can remove the noise in the abnormal signals in a filtration manner so that the induction signals are formed, and the signal processing unit is used for processing the induction signals. The touch panel with the anti-noise unit resolves the problem of misinformation of touch points without adjusting analog to the digital conversion frequency or a signal processing algorithm of a microprocessor, and the problem that the time for transmitting the induction signals from the touch sensor to an operation system is prolonged is avoided.

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, particularly relevant for a kind of can antimierophonic contact panel.

Background technology

The relevant rapid technological improvement of contact panel in recent years; For example electric resistance touch-control panel, capacitance type touch-control panel, acoustic wave contact panel, and optical touch control panel; Be widely used on communication product, computer installation and the consumption electronic products convenience of using the usefulness that significantly increases applied electronic product and using.

And capacitor-type touch panel can be imported with finger; Facility with input operation; And its input operation need not passed through and presses, the shortcoming that can not let panel have to bear the stress, distortion and causing of touching repeatedly to damage, and composition simple structure, the assembly of this kind touch pad are few; The product yield is high, is fit to produce to reduce cost in a large number.

Fig. 1 is the basic framework figure of known touch sensor (touch sensor) 100.Between a glass substrate 110 and an indium tin oxide layer 130 by an optical cement (optically clear adhesive; OCA) 120 and engage, and at this indium tin oxide layer (indium tin oxide; ITO) 130 and one cover glass (cover lens) is engaged by another optical cement 120 between 140, to accomplish this touch sensor 100.

Fig. 2 is the basic framework figure of known contact panel (touch panel) 200.One touch sensor 100 is disposed at a LCD MODULE (LCD Module; LCM) 250 tops are to accomplish this contact panel 200.For example, the glass substrate 110 of touch sensor 100 is engaged in this LCD MODULE 250, and between this LCD MODULE 250 and this glass substrate 110, an air gap 260 is arranged.

Fig. 3 is the square Organization Chart that the signal of known contact panel is handled.Capacitance variation when one touch sensor 100 can be responded to because of touching is exported analog signal (sensor IO signal) to a simulation multiplexer (analog multiplexer) 320.This simulation multiplexer 320 is exported to an analog-digital converter 330 via the action of scanning with the analog signal that scans.This analog-digital converter 330 converts this analog signal to digital signal and deals with and export controlling signal to a microcontroller 340.At last, via a transmission interface 350 controlling signal is passed to an operating system 360 again and do computing to judge the touch points position.

But; After touch sensor is being costed LCD MODULE; Touch sensor can receive the interference of noise that LCD MODULE brings and cause the situation of wrong report touch points easily; The former common voltage (Vcom) because of LCD MODULE that this noise produces receives the influence of data line (source line) coupling (couple) and causes unsettled situation, can cause unsettled situation during especially at heavily loaded picture or at the fast updating picture.At present; The general practice goes to solve the situation of wrong report touch points for adjustment firmware (firmware); For example adjust the algorithm of analog digital inversion frequency or microcontroller processing signal etc., but this practice all can prolong the processing time that sensor signal is sent to operating system from touch sensor.

Therefore, just having to provide a kind of antimierophonic contact panel, can solve aforesaid problem.

Summary of the invention

The present invention provides a kind of contact panel, comprises display module, produces a noise; Touch sensor is arranged on the display module top, and the output abnormality signal, and wherein abnormal signal comprises noise and sensor signal; The antinoise unit behind reception abnormal signal and the noise, can form sensor signal with the noise filtering in the abnormal signal; And signal processing unit, in order to handle sensor signal.

One of characteristic of the present invention is: a kind of antinoise unit that is used for contact panel; This contact panel comprises a touch sensor and a display module; This display module produces a noise, and this touch sensor is exported an abnormal signal, and this abnormal signal comprises this noise and a sensor signal; It is characterized in that this antinoise unit comprises:

One first filtering circuit receives this abnormal signal, and allow one greater than this abnormal signal of a reference voltage through forming one first filtering signal;

One second filtering circuit receives this noise, and allows this noise greater than this reference voltage through forming one second filtering signal; And

One comparator circuit, in order to receiving this first filtering signal and the second filtering signal, and this first and second filtering signal and export a signal relatively relatively, wherein relatively signal be this sensor signal.

Another feature of the present invention is: a kind of contact panel is characterized in that: comprising:

One display module produces a noise;

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

One antinoise unit, receive this abnormal signal and this noise after, can this noise filtering in this abnormal signal be formed this sensor signal; And

One signal processing unit is in order to handle this sensor signal.

Of the present invention also have one to be characterised in that: a kind of method for processing noise that is used for contact panel; This contact panel comprises a touch sensor and a display module; This display module produces a noise; This touch sensor is exported an abnormal signal, and this abnormal signal comprises this noise and a sensor signal, comprises the following steps:

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

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

Receive this first filtering signal and this second filtering signal, and relatively this first filtering signal and this second filtering signal mutually, according to comparative result output one signal relatively, wherein relatively signal is this sensor signal.

Advantage of the present invention: the comparison signal that the comparator circuit of antinoise of the present invention unit is exported is the high levle or the low level of the normal induction signal of touch sensor; That is antinoise of the present invention unit can form a normal induction signal with the noise filtering in the abnormal signal really, and the interference of noise that LCD MODULE brings can not take place and causes the situation of wrong report touch points.Therefore; Contact panel with antinoise unit of the present invention must not adjusted analog digital inversion frequency or microcontroller and handle the situation that the algorithm of signal solves the wrong report touch points, avoids prolonging from touch sensor sensor signal to the processing time of passing to operating system.

Description of drawings

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 that the signal of known contact panel is handled;

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

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

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

Fig. 7 is the method for processing noise process flow diagram that is used for contact panel of the embodiment of the invention; And

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

Wherein: 100,410 touch sensors

110 glass substrates

120 optical cements

130 indium tin oxide layers

140 cover glasses

200,400 contact panels

250 LCD MODULEs

260 air gaps

320,520 simulation multiplexers

330,530 analog-digital converters

340,540 microcontrollers

350,550 transmission interfaces

360,560 operating systems

420 antinoise unit

430 signal processing units

450 display modules

610 first filtering circuits

620 second filtering circuits

630 comparator circuits

640 abnormal signals

650 common voltages coupling signal

660 first filtering signals

670 second filtering signals

680 compare signal

Q10 first switch

The Q20 second switch

Q30 the 3rd switch

Q40 the 4th switch

Q50 the 5th switch

Q60 the 6th switch

The Q70 minion is closed

The Q80 octavo is closed

Q90 the 9th switch

Q100 the tenth switch

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 first operational amplifier

IC2 second operational amplifier

IC3 the 3rd operational amplifier

The IC4 four-operational amplifier

S700 ~ S740 step.

Embodiment

Fig. 4 is the square Organization Chart of the contact panel with antinoise unit 400 of one of the present invention embodiment.One touch sensor (touch sensor) 410 is arranged on a display module 450 (for example LCD MODULE) top.When this touch sensor 410 outputs one sensor signal, the noise that this sensor signal is produced because of this display module 450 (for example common voltage coupling signal) influence a becoming abnormal signal (that is abnormal signal comprises normal induction signal and noise).This touch sensor 410 can be passed to an antinoise unit (anti-noise unit) 420 with this abnormal signal.After this antinoise unit 420 receives this abnormal signal of this touch sensor 410, can the noise filtering in the abnormal signal be formed a normal induction signal, and this normal induction signal is passed to a signal processing unit 430.This signal processing unit 430 is in order to handle this normal induction signal.

Please refer to Fig. 5, in detail, this signal processing unit 430 can comprise a simulation multiplexer 520, an analog-digital converter 530, a microcontroller 540, a transmission interface 550 and an operating system 560.Touch sensor 410 originally can be exported a sensor signal, but receives the noise of LCD MODULE, and touch sensor 410 can be exported an abnormal signal (comprising sensor signal and noise) on the contrary and give simulation multiplexer (analog multiplexer) 520.This simulation multiplexer 520 is exported to this antinoise unit 420 via the action of scanning with the abnormal signal that scans.This antinoise unit 420 becomes this abnormal signal into the normal induction signal and gives analog-digital converter (analog to digital converter; ADC) 530.This analog-digital converter 530 converts this normal induction signal to digital signal by analog signal and gives microcontroller (micro-controller unit; MCU) 540 deal with and export controlling signal.At last, via transmission interface (interface) 550 controlling signal is passed to operating system (operating system again; OS) 560 do computing, to judge the touch points position.Capacitance variation during for example, because of touching causes sensor signal to change computing touch points position.

Please refer to Fig. 6, be the circuit diagram of the antinoise unit 420 of one of the present invention embodiment.This antinoise unit 420 comprises one first filtering circuit 610, one second filtering circuit 620, an and comparator circuit 630.This first filtering circuit 610 comprises one first operational amplifier IC1, one first switch Q10, a second switch Q20 and one the 3rd switch Q30.The 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 is exported).This first operational amplifier IC1 compares with reference voltage this abnormal signal 640, and at its output terminal output comparative result.This first switch Q10 comprises one first end Q11, one second end Q12 and a control end Q13.The first end Q11 receives this abnormal signal 640.The second end Q12 exports one first filtering signal 660.This control end Q13 is electrically connected at this output terminal of this first operational amplifier IC1, and the comparison signal of being exported by this first operational amplifier IC1 is with whether conducting of this first end Q11 of controlling this first switch Q10 and this second end Q12.This second switch Q20 comprises one first end Q21, one second end Q22 and a control 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 output terminal of this first operational amplifier IC1, and the comparison signal of being exported by this first operational amplifier IC1 is in order to control whether conducting of this first end Q21 and this second end Q22.The 3rd switch Q30 comprises one first end Q31, one second end Q32 and a control 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 conducting of this first end Q31 and this second end Q32.

This second filtering circuit 620 comprises one second operational amplifier IC2, one the 4th switch Q40, one the 5th switch Q50 and one the 6th switch Q60.The normal phase input end of this second operational amplifier IC2 receives this reference voltage; One negative-phase input receives a common voltage coupling signal (Vcom couple signal) 650 (common voltage coupling signal 650 is meant that common voltage receives the influence that data line is coupled and causes); This second operational amplifier IC2 compares with reference voltage this common voltage coupling signal 650, and at its output terminal output comparative result.The 4th switch Q40 comprises one first end Q41, one second end Q42 and a control end Q43.First termination is received this common voltage coupling signal 650.This second end Q42 exports one second filtering signal 670.This control end Q43 is electrically connected at this output terminal of this second operational amplifier IC2, by the comparison signal of the output of this second operational amplifier IC2, with whether conducting of this first end Q41 of controlling the 4th switch Q40 and this second end Q42.The 5th switch Q50 comprises one first end Q51, one second end Q52 and a control 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 output terminal of this second operational amplifier IC2, and the comparison signal of being exported by this second operational amplifier IC2 is to control whether conducting of this first end Q51 and this second end Q52.The 6th switch Q60 comprises one first end Q61, one second end Q62 and a control end Q63.The first end Q61 is electrically connected at this second end Q42 of the 4th switch Q40.The 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 conducting of this first end Q61 and this second end Q62.

This comparator circuit 630 comprises that one the 3rd operational amplifier IC3, a four-operational amplifier IC4, a minion are closed Q70, an octavo is closed Q80, one the 9th switch Q90 and 1 the tenth switch Q100.The normal phase input end of the 3rd operational amplifier IC3 receives this first filtering signal 660 of this first filtering circuit 610; One negative-phase input receives this second filtering signal 670 of this second filtering circuit 620; IC3 compares with this second filtering signal 670 this first filtering signal 660 behind the 3rd operational amplifier, and at its output terminal output comparative result.The negative-phase input of this four-operational amplifier IC4 receives this first filtering signal 660 of this first filtering circuit 610; One normal phase input end receives this second filtering signal 670 of this second filtering circuit 620; This four-operational amplifier IC4 compares with this second filtering signal 670 this first filtering signal 660, and at its output terminal output comparative result.This minion is closed Q70 and is comprised one first end Q71, one second end Q72 and a control end Q73.This control end Q73 electrically connects this output terminal of this four-operational amplifier IC4, and the comparison signal of being exported by this four-operational amplifier IC4 is to control whether conducting of this first end Q71 and this second end Q72.This octavo is closed Q80 and is comprised one first end Q81, one second end Q82 and a control end Q83.This first end Q81 is electrically connected at this second end Q72 that this minion is closed Q70.This second end Q82 is electrically connected at this reference voltage.This control end Q83 electrically connects this output terminal of the 3rd operational amplifier IC3, and the comparison signal of being exported by the 3rd operational amplifier IC3 is to control whether conducting of this first end Q81 and this second end Q82.The 9th switch Q90 comprises one first end Q91, one second end Q92 and a control end Q93.This first end Q91 is electrically connected at a high levle signal (the high levle signal is meant the high levle of the normal induction signal of touch sensor 410).The electrical Q92 of this second end is connected in this first end Q71 that this minion is closed Q70, and should compare signal 680 in order to output.This control end Q93 is electrically connected at this output terminal of the 3rd fortune amplifier IC3, by the comparison signal of the output of the 3rd operational amplifier IC3, to control whether conducting of this first end Q91 and this second end Q92.The tenth switch Q10 comprises one first end Q101, one second end Q102 and a control end Q103.This first end Q101 is electrically connected at this second end Q92 of the 9th switch Q90, and should compare signal 680 in order to output.This second end Q102 is electrically connected at this reference voltage.This control end Q103 is electrically connected at this output terminal of this four-operational amplifier IC4, by the comparison signal of the output of this four-operational amplifier IC4, in order to control whether conducting of this first end Q101 and this second end Q102.

The first switch Q10, the 3rd switch Q30, the 4th switch Q40, the 6th switch Q60, minion pass Q70 and octavo pass Q80 are p type field effect transistor in above-mentioned, 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 low level signal (the low level signal is meant the low level of the normal induction signal of touch sensor 410), for example zero volt.The comparison signal 680 that comparator circuit 630 is exported also can form a normal induction signal with the noise filtering in the abnormal signal for the high levle or the low level of the normal induction signal of touch sensor.

Fig. 7 is the method for processing noise process flow diagram that is used for contact panel of embodiments of the invention.Please again with reference to figure 6, this first filtering circuit 610 receives this abnormal signal 640 and this second filtering circuit 620 receives a common voltage coupling signal 650 (step S700).This first filtering circuit 610 allows greater than this abnormal signal 640 of reference voltage through forming one first filtering signal 660, and this first filtering signal 660 is passed to a comparator circuit 630; And this second filtering circuit 620 allows greater than this common voltage coupling signal 650 of this reference voltage through forming one second filtering signal 670, and this second filtering signal 670 is passed to this comparator circuit 630 (step S710).This comparator circuit 630 is in order to receiving the first filtering signal 660 and the second filtering signal 670, and the relatively first filtering signal 660 and the second filtering signal 670 and export a signal 680 relatively.For example; This comparator circuit 630 judges that whether this first filtering signal 660 is greater than this second filtering signal 670 (step S720); If this filtering signal 610 greater than this second filtering signal 620, is just exported a high levle signal (step S730), otherwise just export a low level signal (step S740).

Fig. 8 is the sequential chart of abnormal signal of the present invention, the first filtering signal, common voltage coupling signal, the second filtering signal and comparison signal.Can be divided into four kinds of situation from the positive and negative situation of signal of abnormal signal and common voltage coupling signal: first kind of situation (A) is all the positive voltage signal for abnormal signal and the common voltage signal that is coupled, and abnormal signal is greater than the common voltage signal that is coupled.Second kind of situation (B) is the positive voltage signal for abnormal signal, and common voltage coupling signal is the negative voltage signal, and abnormal signal is greater than the common voltage signal that is coupled.The third situation (C) is all the positive voltage signal for abnormal signal and the common voltage signal that is coupled, and abnormal signal is less than the common voltage signal that is coupled.The 4th kind of situation (D) is all the negative voltage signal for abnormal signal and the common voltage signal that is coupled, and abnormal signal is greater than the common voltage signal that is coupled.In detail, please again with reference to figure 6 and Fig. 8.In the present embodiment, the signal of the action of the circuit of noise processed unit and each point.When first kind of situation (A); The first operational amplifier IC1 and the second operational amplifier IC2 all can export the low level signal; Second switch Q20, the 3rd switch Q30, the 5th switch Q50 and the 6th not conducting of switch Q60, the first switch Q10 conducting is also exported the first filtering signal 660 and is given the 3rd operational amplifier IC3, and the 4th switch Q40 conducting is also exported the second filtering signal 670 and is given four-operational amplifier IC4; This moment, the first filtering signal 660 was greater than the second filtering signal 670; So the 3rd operational amplifier can be exported the high levle signal, four-operational amplifier IC4 can export the low level signal, and then minion is closed conducting Q70; Octavo is closed Q80 and the tenth not conducting of switch Q100, and the comparison signal 680 of the 9th switch Q90 conducting this moment and output is the high levle signal.

When second kind of situation (B); The first operational amplifier IC1 can export the low level signal, and the second operational amplifier IC2 can export the high levle signal, second switch Q20, the 3rd switch Q30 and the 4th not conducting of switch Q40; The first switch Q10 conducting is also exported the first filtering signal 660 and is given the 3rd operational amplifier IC3; The 5th switch Q50 and the 6th switch Q60 conducting are also exported the accurate position of no-voltage and are given four-operational amplifier IC4, and this moment, the first filtering signal 660 was greater than the accurate position of no-voltage signal, so the 3rd operational amplifier IC3 output high levle signal; Four-operational amplifier IC4 output low level signal; Then minion is closed the Q70 conducting, and octavo is closed Q80 and the tenth not conducting of switch Q100, and the comparison signal 680 of the 9th switch Q90 conducting this moment and output is the high levle signal.

When the third situation (C); The first operational amplifier IC1 and the second operational amplifier IC2 all can export the low level signal; Second switch Q20, the 3rd switch Q30, the 5th switch Q50 and the 6th not conducting of switch Q60, the first switch Q10 conducting is also exported the first filtering signal 660 and is given the 3rd operational amplifier IC3, and the 4th switch Q40 conducting is also exported the second filtering signal 670 and is given four-operational amplifier IC4; This moment, the first filtering signal 660 was less than the second filtering signal 670; So the 3rd operational amplifier IC3 can export the low level signal, four-operational amplifier IC4 can export the high levle signal, and then octavo is closed the Q80 conducting; But minion is closed Q70 and the 9th not conducting of switch Q90, and the comparison signal 680 of the tenth switch Q100 conducting this moment and output is the low level signal of no-voltage.

When the 4th kind of situation (D); The first operational amplifier IC1 and the second operational amplifier IC2 all can export high levle; All conductings and export the accurate position of no-voltage of the 3rd switch Q30 and the 6th switch Q60, the first switch Q10 and the 4th not conducting of switch Q40, second switch Q20 conducting are also exported the accurate position of no-voltage and are given the 3rd operational amplifier IC3; The 5th switch Q50 conducting is also exported the accurate position of no-voltage and is given four-operational amplifier IC4; Because 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 at this moment, so the 3rd operational amplifier IC3 and four-operational amplifier IC4 are output as all accurate positions of low-voltage, then the 9th switch Q90 and the neither conducting of the tenth switch Q100; Octavo is closed the Q80 conducting, and this moment, the comparison signal 680 of Q70 conducting of minion pass and output was the low level signal of no-voltage.

When above-mentioned four kinds of situation (A), (B), (C) reach (D); The comparison signal that the comparator circuit of antinoise of the present invention unit is exported is the high levle or the low level of the normal induction signal of touch sensor; That is antinoise of the present invention unit can form a normal induction signal with the noise filtering in the abnormal signal really, and the interference of noise that LCD MODULE brings can not take place and causes the situation of wrong report touch points.Therefore; Contact panel with antinoise unit of the present invention must not adjusted analog digital inversion frequency or microcontroller and handle the situation that the algorithm of signal solves the wrong report touch points, avoids prolonging from touch sensor sensor signal to the processing time of passing to operating system.

In sum, be only notebook invention for presenting the embodiment or the embodiment of the technological means that adopted of dealing with problems, be not the scope that is used for limiting patent working of the present invention.Be that patent claim context all and of the present invention conforms to, or change and modification, be all claim of the present invention and contain according to the equalization that claim of the present invention is done.

Claims (10)

1. antinoise unit that is used for contact panel; This contact panel comprises a touch sensor and a display module; This display module produces a noise, and this touch sensor is exported an abnormal signal, and this abnormal signal comprises this noise and a sensor signal; It is characterized in that this antinoise unit comprises:
One first filtering circuit receives this abnormal signal, and allow one greater than this abnormal signal of a reference voltage through forming one first filtering signal;
One second filtering circuit receives this noise, and allows this noise greater than this reference voltage through forming one second filtering signal; And
One comparator circuit, in order to receiving this first filtering signal and the second filtering signal, and this first and second filtering signal and export a signal relatively relatively, wherein relatively signal be this sensor signal.
2. the antinoise unit that is used for contact panel according to claim 1 is characterized in that: wherein this first filtering circuit comprises:
One comparer, a normal phase input end of this comparer receives this reference voltage, and a negative-phase input receives this abnormal signal, and this comparer compares this abnormal signal and this reference voltage, and at its output terminal output comparative result;
One first switch comprises:
One first end receives this abnormal signal;
One second end is exported this first filtering signal; And
One control end is electrically connected at this output terminal of this comparer, in order to control the whether conducting of this first end and this second end;
One second switch comprises:
One first end is electrically connected at this second end of this first switch;
One second end is electrically connected at this reference voltage; And
One control end is electrically connected at this output terminal of this comparer, in order to control the whether conducting of this first end and this second end; And
One the 3rd switch comprises:
One first end is electrically connected at this second end of this first switch;
One second end is electrically connected at this reference voltage; And
One control end receives this abnormal signal, in order to control the whether conducting of this first end and this second end.
3. the antinoise unit that is used for contact panel according to claim 1 is characterized in that: wherein this second filtering circuit comprises:
One comparer, a normal phase input end of this comparer receives this reference voltage, and a negative-phase input receives this noise, and this comparer compares this noise and this reference voltage, and at its output terminal output comparative result;
One first switch comprises:
One first end receives this noise;
One second end is exported this second filtering signal; And
One control end is electrically connected at this output terminal of this comparer, in order to control the whether conducting of this first end and this second end;
One second switch comprises:
One first end is electrically connected at this second end of this first switch;
One second end is electrically connected at this reference voltage; And
One control end is electrically connected at this output terminal of this comparer, in order to control the whether conducting of this first end and this second end; And
One the 3rd switch comprises:
One first end is electrically connected at this second end of this first switch;
One second end is electrically connected at this reference voltage; And
One control end receives this noise, in order to control the whether conducting of this first end and this second end.
4. the antinoise unit that is used for contact panel according to claim 1, it is characterized in that: wherein this comparator circuit comprises:
One first comparer; One normal phase input end of this comparer receives one first filtering signal of one first filtering circuit; One negative-phase input receives one second filtering signal of one second filtering circuit; This first comparer compares this first filtering signal and this second filtering signal, and at its output terminal output comparative result;
One second comparer; One negative-phase input of this comparer receives this first filtering signal; One normal phase input end receives this second filtering signal, and this second comparer compares this first filtering signal and this second filtering signal, and at its output terminal output comparative result;
One first switch comprises:
One first end;
One second end; And
One control end electrically connects this output terminal of this second comparer, in order to control the whether conducting of this first end and this second end;
One second switch comprises:
One first end is electrically connected at this second end of this first switch;
One second end is electrically connected at this reference voltage; And
One control end electrically connects this output terminal of this first comparer, in order to control the whether conducting of this first end and this second end;
One the 3rd switch comprises:
One first end is electrically connected at a high levle signal;
One second end is electrically connected at this first end of this first switch, and in order to output signal relatively; And
One control end is electrically connected at this output terminal of this first fortune amplifier, in order to control the whether conducting of this first end and this second end; And
One the 4th switch comprises:
One first end is electrically connected at this second end of the 3rd switch;
One second end is electrically connected at this reference voltage; And
One control end is electrically connected at this output terminal of this second operational amplifier, in order to control the whether conducting of this first end and this second end.
5. contact panel is characterized in that: comprising:
One display module produces a noise;
One touch sensor is arranged on this display module top, and exports an abnormal signal, and wherein this abnormal signal comprises this noise and a sensor signal;
One antinoise unit, receive this abnormal signal and this noise after, can this noise filtering in this abnormal signal be formed this sensor signal; And
One signal processing unit is in order to handle this sensor signal.
6. contact panel according to claim 5 is characterized in that, wherein this antinoise unit comprises:
One first filtering circuit receives this abnormal signal, and allow one greater than this abnormal signal of reference voltage through forming one first filtering signal;
One second filtering circuit receives this noise, and allows this noise greater than this reference voltage through forming one second filtering signal; And
One comparator circuit, in order to receiving this first filtering signal and the second filtering signal, and the relatively first filtering signal and the second filtering signal and export a signal relatively, wherein relatively signal be this sensor signal.
7. method for processing noise that is used for contact panel; This contact panel comprises a touch sensor and a display module, and this display module produces a noise, and this touch sensor is exported an abnormal signal; This abnormal signal comprises this noise and a sensor signal, comprises the following steps:
Receive this abnormal signal, and allow to pass through, form one first filtering signal greater than this abnormal signal of a reference voltage;
Receive this noise, and allow to pass through, form one second filtering signal greater than this noise of this reference voltage; And
Receive this first filtering signal and this second filtering signal, and relatively this first filtering signal and this second filtering signal mutually, according to comparative result output one signal relatively, wherein relatively signal is this sensor signal.
8. the method for processing noise that is used for contact panel according to claim 7 is characterized in that: wherein this noise is a common voltage coupling signal, and this common voltage coupling signal is meant that a common voltage receives the influence that a data line is coupled and causes.
9. the method for processing noise that is used for contact panel according to claim 7 is characterized in that: also comprise the following steps: to export a high levle signal when this first filtering signal during greater than this second filtering signal.
10. the method for processing noise that is used for contact panel according to claim 7 is characterized in that: also comprise the following steps: when this first filtering signal is equal to or less than this second filtering signal, to 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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