CN102929411B - Electromagnetic touch device - Google Patents

Electromagnetic touch device Download PDF

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Publication number
CN102929411B
CN102929411B CN201210390360.8A CN201210390360A CN102929411B CN 102929411 B CN102929411 B CN 102929411B CN 201210390360 A CN201210390360 A CN 201210390360A CN 102929411 B CN102929411 B CN 102929411B
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CN
China
Prior art keywords
signal
circuit
electromagnetic touch
filtering
receiving antenna
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CN201210390360.8A
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Chinese (zh)
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CN102929411A (en
Inventor
谢磊
贺爱兰
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贺爱兰
谢磊
詹金良
黄绍中
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Priority to CN201210390360.8A priority Critical patent/CN102929411B/en
Publication of CN102929411A publication Critical patent/CN102929411A/en
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Publication of CN102929411B publication Critical patent/CN102929411B/en

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Abstract

The present invention relates to a kind of electromagnetic touch device, comprising: antenna modules, described antenna modules comprises signal transmission circuit and signal receiving antenna; And the control system to be connected with antenna modules, described control system comprises: signal amplification circuit; Be connected to signal amplification circuit with to carrying out filtering process through amplifying signal and exporting the filtering circuit of two paths of signals; Detection and integrating circuit; Schmidt trigger circuit; Data processing and communication module; Wherein, described signal receiving antenna is two-way, is equipped with a road signal amplification circuit for each road signal receiving antenna; Described filtering circuit be simultaneously to two paths of signals receiving antenna receive and the plus-minus method that touching signals through amplifying process carries out filtering process compares filtering circuit.Signalization radiating circuit and two paths of signals receiving antenna while that the present invention being in same electromagnetic touch-control device, and coordinate plus-minus method to compare filtering circuit, thus passive electromagnetic pointer can be coordinated to use, active electromagnetic touch pen also can be coordinated to use.

Description

Electromagnetic touch device

Technical field

The present invention relates to touch control technical field, particularly relate to a kind of electromagnetic touch device.

Background technology

Touch control technology is more and more applied in electronics field.At present, the touch screen technology of main flow mainly contains following several: resistance-type, condenser type and inductance type.Wherein, inductive touch control screen can be divided into active and passive by principle of work, active passive is mainly for electromagnetic touch pen.

Active electromagnetic contactor control device can be referred to as active electromagnetic touch-control device, its principle of work is: electromagnetic touch pen is transmission of electromagnetic signals initiatively, antenna plate Received signal strength also passes to control system, and then control system sends touch information after signal is carried out amplification filtering after the MCU process of control system.

Passive electrical magnetic-type contactor control device is also known as passive electromagnetic contactor control device, its principle of work is: master control borad control signal is launched by antenna plate, passive electromagnetic pointer can produce the oscillator signal of certain frequency after sensing signal, this signal is received by antenna plate and sends control system to, and then control system sends touch information after signal is carried out amplification filtering after the MCU process of control system.

Find in actual use, active Electromagnetic contactor control device is quick on the draw in large size electro thoughts and feelings control application aspect, and pen pressure more easily realizes, but deposits the worry being in use required to be active Electromagnetic pointer replacing battery or charging.And passive electromagnetic pointer is easily disturbed because of signal to noise ratio (S/N ratio) factor on master control borad.Existing electromagnetic touch-control device adopts low pass, the Hi-pass filter of traditional RC circuit composition, the principle of this traditional RC circuit filtering is decayed by signal, low-pass filtering is more in high band decay, high-pass filtering is then more in low-frequency range decay, and useful signal also can and then be decayed a part in the process of decay, particularly or undesired signal frequency range comparatively large in interference ratio and electromagnetic touch pen transmit under the close rugged surroundings of frequency range and obtain better signal to noise ratio (S/N ratio) by high pass low-pass filtering is very difficult.

Summary of the invention

Technical matters to be solved by this invention is, provides a kind of electromagnetic touch device, can effectively coordinate active electromagnetic touch pen and passive electromagnetic pointer to use respectively.

For solving the problems of the technologies described above, the invention provides following technical scheme: a kind of electromagnetic touch device, comprising:

Antenna modules, described antenna modules comprises for the signal transmission circuit to a matching used electromagnetic touch emissioning controling signal and the signal receiving antenna for receiving the touching signals that electromagnetic touch pen is launched; And

The control system be connected with antenna modules, described control system comprises:

Be connected to signal receiving antenna, carry out amplifying the signal amplification circuit of process to received touching signals;

Be connected to signal amplification circuit with to carrying out filtering process through amplifying signal and exporting the filtering circuit of two paths of signals;

Detection and integrating circuit, carry out detection and Integral Processing to the first via signal that filtering circuit exports;

Schmidt trigger circuit, carries out frequency phase-angle detection to the second road signal that filtering circuit exports;

Data processing and communication module, the X/Y two-dimensional coordinate that analog to digital conversion compares to calculate electromagnetic touch pen is carried out to the first via signal through detection and integrating circuit process, and frequency analyses calculation is carried out to determine an electromagnetic touch status to the second road signal through schmidt trigger circuit process;

Wherein, described signal receiving antenna is two-way, is equipped with a road signal amplification circuit for each road signal receiving antenna; Described filtering circuit be simultaneously to described two paths of signals receiving antenna receive and touching signals through amplifying process the plus-minus method carrying out filtering process compares filtering circuit.

Further, described signal transmission circuit comprises emitting antenna and signal countdown circuit.

Further, described signal receiving antenna is made up of the closing coil of X-direction and Y-direction.

Further, described electromagnetic touch device also comprises active electromagnetic touch pen or passive electromagnetic pointer.

Further, antenna modules is connected to control system by flexible PCB.

Further, described data processing and communication module also include for carrying out USB interface or the inter-integrated circuit of communication with corresponding system end.

After adopting technique scheme, the present invention at least has following beneficial effect: the present invention is provided with signal transmission circuit and two paths of signals receiving antenna in same electromagnetic touch-control device simultaneously, and adopt plus-minus method to compare filtering circuit, thus make electromagnetic touch device of the present invention that passive electromagnetic pointer can be coordinated to use, also active electromagnetic touch pen can be coordinated to use, and range of application is wider.

The present invention can once gating two unidirectional coils be as Xn and Xn+m Received signal strength simultaneously, if Xn receives the signal of electromagnetic touch pen, so Xn+m is exactly the undesired signal beyond an electromagnetic touch signal.And coordinate plus-minus method of the present invention to compare filtering circuit again to carry out filtering, compared with the low pass formed with traditional RC, Hi-pass filter, plus-minus method compares filtering circuit can reach better filter effect, extracts the better signal of signal to noise ratio (S/N ratio).

Accompanying drawing explanation

Fig. 1 is the system principle diagram of electromagnetic touch device of the present invention.

Embodiment

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined with each other, and are described in further detail the present invention below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, the invention provides a kind of electromagnetic touch device, comprising:

Antenna modules 1, described antenna modules 1 comprises for the signal transmission circuit 10 to matching used electromagnetic touch pen 3 emissioning controling signal and the signal receiving antenna 12 for receiving the touching signals that electromagnetic touch pen 3 is launched, wherein, described signal transmission circuit 10 comprises emitting antenna 100 and signal countdown circuit 102, described signal receiving antenna 12 is provided with two-way, the same with the signal receiving antenna of existing electromagnetic touch device, signal receiving antenna 12 of the present invention is also made up of the closing coil of X-direction and Y-direction;

The control system 2 be connected with antenna modules 1, preferably, be use flexible PCB to connect antenna modules 1 and control system 2, described control system 2 comprises again:

Being connected to signal receiving antenna 12 carries out amplifying process signal amplification circuit 20 to received touching signals, when specifically implementing, is be equipped with a road signal amplification circuit 20 for each road signal receiving antenna;

Be connected to signal amplification circuit 20 with to carrying out filtering process through amplifying signal and exporting the filtering circuit 21 of two paths of signals, the filtering circuit 21 that the present invention adopts for simultaneously to described two paths of signals receiving antenna 12 receive and the plus-minus method that touching signals through amplifying process carries out filtering process compares filtering circuit;

Detection and integrating circuit 22, carry out detection and Integral Processing to the first via signal that filtering circuit 21 exports;

Schmidt trigger circuit 24, carries out frequency phase-angle detection to the second road signal that filtering circuit 21 exports;

Data processing and communication module 26, the X/Y two-dimensional coordinate that analog to digital conversion compares to calculate circuit electromagnetic touch pen 3 is carried out to the first via signal processed through detection and integrating circuit 22, and frequency analyses calculation is carried out to determine an electromagnetic touch status to the second road signal processed through schmidt trigger circuit 24, described data processing and communication module 26 can adopt MCU.Described data processing and communication module also include for carrying out USB interface or the inter-integrated circuit of communication, treated touching signals is sent to system end with corresponding system end.

In one embodiment, also can be described electromagnetic touch device and be equipped with electromagnetic touch pen 3, described electromagnetic touch pen 3 can be active Electromagnetic pointer or passive electromagnetic pointer.

Principle of work below for electromagnetic touch device of the present invention is described.

First, control system judges whether to there is active electromagnetic touch pen, and namely whether active detecting has the touching signals that corresponding active Electromagnetic pointer sends, if any then carrying out follow-up touch information process; When there is no active touch control signal, then by antenna modules emissioning controling signal, and then the X scanning receiving antenna is one by one to the closing coil with Y-direction, after the touching signals that passive electromagnetic pointer is fed back being detected, then carry out follow-up touching signals process, if passive electromagnetic pointer do not detected yet, the transmitting of stop control signal, carries out the step detecting active Electromagnetic pointer again, so repeat to detect, until find that there is corresponding electromagnetic touch pen to have issued touching signals.

When coordinating active electromagnetic touch pen to use, because active electrical magnetic pen is made up of power unit and oscillating circuit, the sine wave that oscillating circuit produces certain frequency passes through inductive emitter, signal receiving antenna 12 chooses the coil of X-direction and the coil of Y-direction to carry out the reception of touching signals by the control of MCU respectively successively, and the touching signals received amplifies via signal amplification circuit.

Signal after amplification compares filtering circuit by plus-minus method again and carries out filtering, the plus-minus method that the present invention adopts compares filtering circuit operationally, the signal comprising an electromagnetic touch touching signals and undesired signal superposition to be directly added with simple undesired signal or to subtract each other, specifically being added or subtracting each other needs to determine according to the phase place of antenna modules 1 received signal, if phase place is identical, subtract each other, otherwise be then added, the touching signals of i.e. only remaining electromagnetic touch pen after above-mentioned process, thus realize filter function.During specific works, open two coil: Xn and Xn+m(m>5) when scanning and receiving X-direction coil signal simultaneously, under equivalent environment, the undesired signal that Xn with Xn+m receives is identical or close, this undesired signal comprises spatial electromagnetic wave interference, LCD backlight is disturbed, interference that antenna modules transmitting coil produces etc., by the signal of Xn and Xn+m respectively after amplifying, make the two paths of signals when not having electromagnetic touch signal close as much as possible by adjustment gain, and then compare filtering circuit by plus-minus method and carry out being added or subtracting each other, concrete use adding circuit or subtraction circuit are determined by the cabling mode of antenna, specifically by the direction of current in the coil of antenna, if all direction of routing of coil are all identical, namely signal end is consistent with the direction of earth terminal, so the phase place of signal is identical, then use subtraction circuit, otherwise use adding circuit.The undesired signal that amplitude equal phase is identical is subtracted each other and undesired signal significantly can be reduced.

Signal after amplification filtering is divided into two-way again, and first via signal inputs MCU after respective handling is carried out in detection and integrating circuit to carry out A/D conversion (analog/digital conversion) and compare, thus calculates the X/Y two-dimensional coordinate of electromagnetic touch pen.Second road signal enters MCU and carries out frequency analyses calculation after schmidt trigger circuit, determines an electromagnetic touch status, then sends touch information by MCU to corresponding system end.

And when coordinating passive electromagnetic pointer to use, because what form electric supply installation is passive electromagnetic pointer do not take over, and only have the lc circuit of electric capacity and inductance composition.When the touching signals of active Electromagnetic pointer not detected, then the square-wave signal of control signal radiation circuit transmission preset frequency, by channel selecting first successively with the coil of Y-direction for emitting antenna, the coil of X-direction is receiving coil.Passive electromagnetic pointer receives square-wave signal, can produce the sine wave of certain frequency under the excitation of square-wave signal, and described sine wave is again by internal inductance spatial emission towards periphery.The coil Received signal strength of the X-direction of receiving antenna, then by signal amplification circuit, the touching signals received is amplified.

Signal after amplification compares filtering circuit by plus-minus method again and carries out filtering, and filtering processing mode when its filtering principle uses with above-mentioned cooperation active electromagnetic touch pen with mode is identical.

Signal after amplification filtering is divided into two-way again, and first via signal inputs MCU after detection and integrating circuit to carry out A/D conversion and compare, and calculates the X-direction coordinate of electromagnetic touch pen, then receives in the same fashion and calculate the Y-direction coordinate of electromagnetic touch pen.Second road signal then enters MCU and carries out frequency analyses calculation after schmidt trigger circuit, determines an electromagnetic touch status.Finally again send touch information to corresponding system end again by MCU.

Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is limited by claims and equivalency range thereof.

Claims (6)

1. an electromagnetic touch device, comprising:
Antenna modules, described antenna modules comprises for the signal transmission circuit to a matching used electromagnetic touch emissioning controling signal and the signal receiving antenna for receiving the touching signals that electromagnetic touch pen is launched; And
The control system be connected with antenna modules, described control system comprises:
Be connected to signal receiving antenna, carry out amplifying the signal amplification circuit of process to received touching signals;
Be connected to signal amplification circuit with to carrying out filtering process through amplifying signal and exporting the filtering circuit of two paths of signals;
Detection and integrating circuit, carry out detection and Integral Processing to the first via signal that filtering circuit exports;
Schmidt trigger circuit, carries out frequency phase-angle detection to the second road signal that filtering circuit exports;
Data processing and communication module, the X/Y two-dimensional coordinate that analog to digital conversion compares to calculate electromagnetic touch pen is carried out to the first via signal through detection and integrating circuit process, and frequency analyses calculation is carried out to determine an electromagnetic touch status to the second road signal through schmidt trigger circuit process;
It is characterized in that, described signal receiving antenna is two-way, is equipped with a road signal amplification circuit for each road signal receiving antenna; Described filtering circuit be simultaneously to described two paths of signals receiving antenna receive and the plus-minus method that touching signals through amplifying process carries out filtering process compares filtering circuit.
2. electromagnetic touch device as claimed in claim 1, it is characterized in that, described signal transmission circuit comprises emitting antenna and signal countdown circuit.
3. electromagnetic touch device as claimed in claim 1, it is characterized in that, described signal receiving antenna is made up of the closing coil of X-direction and Y-direction.
4. electromagnetic touch device as claimed in claim 1, it is characterized in that, described electromagnetic touch device also comprises active electromagnetic touch pen or passive electromagnetic pointer.
5. electromagnetic touch device as claimed in claim 1, it is characterized in that, antenna modules is connected to control system by flexible PCB.
6. electromagnetic touch device as claimed in claim 1, is characterized in that, described data processing and communication module also include for carrying out USB interface or the inter-integrated circuit of communication with corresponding system end.
CN201210390360.8A 2012-10-15 2012-10-15 Electromagnetic touch device CN102929411B (en)

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CN102929411B true CN102929411B (en) 2015-09-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3413174A4 (en) * 2017-03-20 2019-04-17 Shenzhen Goodix Technology Co., Ltd. Signal processing method for active pen, active pen, and touch screen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150293615A1 (en) * 2014-04-09 2015-10-15 Maxim Integrated Products, Inc. Hybrid pen device and method
CN105843444B (en) * 2016-03-18 2018-11-09 广东小天才科技有限公司 A kind of signal coordinates processing method, circuit and electromagnetism apparatus for writing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1534307A (en) * 2003-03-28 2004-10-06 株式会社华科姆 Position detecting system and position detecting device
CN2779483Y (en) * 2004-11-26 2006-05-10 明基电通股份有限公司 Coil type touch control apparatus
CN101038526A (en) * 2006-03-16 2007-09-19 株式会社华科姆 Position detecting apparatus, position inputting apparatus and computer
CN101201713A (en) * 2006-12-13 2008-06-18 株式会社和冠 Coordinate input apparatus
CN101673149A (en) * 2008-09-10 2010-03-17 太瀚科技股份有限公司 Electromagnetic handwriting input device and electromagnetic handwriting input method
TW201113797A (en) * 2009-10-09 2011-04-16 Waltop Int Corp Data processing method and system with multiple input units

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1534307A (en) * 2003-03-28 2004-10-06 株式会社华科姆 Position detecting system and position detecting device
CN2779483Y (en) * 2004-11-26 2006-05-10 明基电通股份有限公司 Coil type touch control apparatus
CN101038526A (en) * 2006-03-16 2007-09-19 株式会社华科姆 Position detecting apparatus, position inputting apparatus and computer
CN101201713A (en) * 2006-12-13 2008-06-18 株式会社和冠 Coordinate input apparatus
CN101673149A (en) * 2008-09-10 2010-03-17 太瀚科技股份有限公司 Electromagnetic handwriting input device and electromagnetic handwriting input method
TW201113797A (en) * 2009-10-09 2011-04-16 Waltop Int Corp Data processing method and system with multiple input units

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
侯涛,尹航,王红岗,王邦江.降低电磁式手写电子纸阅读器功耗的方案.《液晶与显示》.2008,第23卷(第4期),504-507. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3413174A4 (en) * 2017-03-20 2019-04-17 Shenzhen Goodix Technology Co., Ltd. Signal processing method for active pen, active pen, and touch screen

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