CN102854460B - Key state detection method for electronic pointer, electronic white board and electronic pointer - Google Patents
Key state detection method for electronic pointer, electronic white board and electronic pointer Download PDFInfo
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- CN102854460B CN102854460B CN201110181943.5A CN201110181943A CN102854460B CN 102854460 B CN102854460 B CN 102854460B CN 201110181943 A CN201110181943 A CN 201110181943A CN 102854460 B CN102854460 B CN 102854460B
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Abstract
The invention relates to a key state detection method for an electronic pointer, an electronic white board and an electronic pointer and belongs to the technical field of computer multi-media. The key state detection method includes steps of transmitting: a transceiving circuit of the electronic white board transmits transmission signals; receiving: the electronic pointer receives the transmission signals and transmits reflection signals based on the transmission signals, and the transceiving circuit of the electronic white board receives the reflection signals; and detecting: the electronic white board detects the state of a key on the electronic pointer according to the attenuation speed of the reflection signals. The key state detection method detects the key state of the electronic pointer according to the theory that the attenuation speed of the reflection signals reflected by the electronic pointer is different under different key states, so that users can achieve commonly-used function switching conveniently by directly operating the key on the electronic pointer.
Description
Technical field
The present invention relates to technical field of computer multimedia, more particularly, relate to a kind of detection method, electronic whiteboard and electronic teacher pointer of electronic teacher pointer key-press status.
Background technology
It is the once huge change in history of education that interactive electric whiteboard replaces traditional blackboard.Electronic whiteboard is that rise along with the development of multimedia technology, computer technology and display technique late 1990s a kind of can be for the multimedia tool of the occasions such as teaching, training, meeting, demonstration.It is combined the most closely with traditional teaching, demonstration mode, with special digital white boards (or projection screen), replace traditional blackboard, by electronic teacher pointer, can on electronic whiteboard, write or analog mouse function, its result can directly be shown on projection screen, breaks away from the constraint of mouse, keyboard.
Principle of work, electronic whiteboard has resistor pressure formula, infrared type, optical induction type, ultrasound wave location, the several types such as induction, wherein induction electronic whiteboard is because positioning precision is high, not fragile, can detect the pressure of the electronic teacher pointer supporting with it and be used widely.Conventionally, induction electronic whiteboard comprises antenna plate, microprocessor and control circuit.Comprise electromagnetic oscillation circuit with the matching used electronic teacher pointer of this induction electronic whiteboard.In actual use, the electromagnetic wave signal of antenna plate on the electromagnetic oscillation circuit inductance electronic whiteboard of electronic teacher pointer transmitting and produce vibration, the electromagnetic wave signal that the vibration of electromagnetic oscillation circuit because produces is received by the antenna plate on electronic whiteboard again.When electronic teacher pointer is different with respect to the position of electronic whiteboard, its electromagnetic wave signal reflecting is also different, is also to have carried the positional information of electronic teacher pointer with respect to electronic whiteboard in the electromagnetic wave signal that reflects of electronic teacher pointer.The microprocessor of electronic whiteboard is processed the electromagnetic wave signal receiving, obtain electronic teacher pointer with respect to the positional information on electronic whiteboard, electronic whiteboard passes to main frame by this positional information subsequently, makes main frame the operation in corresponding position to realize corresponding function according to electronic teacher pointer.
Use the electronic teacher pointer of this interactive electric whiteboard to carry out interactive demonstration system function while switching, user is generally by pressing or click the button on electronic whiteboard, or clicks and be projected in the software function key on electronic whiteboard with electronic teacher pointer, and practical function switches.This method complex operation, and can not realize remote-controlled operation, make user feel inconvenience deeply.
Summary of the invention
Technical matters to be solved by this invention is the defect for prior art, propose a kind of detection method, electronic whiteboard and electronic teacher pointer of electronic teacher pointer key-press status, adopt method unlike the prior art to make the button of user on can direct control electronic teacher pointer just can realize quickly and easily the switching of common function.
In order to solve the problems of the technologies described above, the invention provides a kind of, the detection method of electronic teacher pointer key-press status, this detection method comprises:
Step of transmitting, the function key of electronic teacher pointer generates electromagnetic waves while being pressed, the electromagnetic wave transmitting transmitted signal that the transmission circuit of electronic whiteboard produces according to electronic teacher pointer; Receiving step, electronic teacher pointer sends reflected signal based on transmitted signal after receiving transmitted signal, and the transmission circuit of electronic whiteboard receives this reflected signal;
Detecting step, electronic whiteboard detects the state that is positioned at the button on electronic teacher pointer according to the rate of decay of reflected signal.
Further, the method also comprises: the standard ratio range relation table corresponding with the state of button that sets in advance first integral value and second integral value.
Wherein, described detecting step comprises:
At transmission circuit, complete for the first time after transmitting, at first integral, in the time, reflected signal is carried out to integration, obtain first integral value; At transmission circuit, complete for the second time after transmitting, at second integral, in the time, reflected signal is carried out to integration, obtain second integral value; The described first integral time is greater than the described second integral time;
According to the ratio of first integral value and second integral value, the state of the button on electronic teacher pointer is detected, this detection is specially: the affiliated standard ratio range of ratio of judging first integral value and second integral value; According to described relation table, determine the state that is positioned at the button on electronic teacher pointer.
An interactive electric whiteboard, comprising:
Transmission circuit, for launching transmitted signal, and reception electronic teacher pointer receives the reflected signal sending based on this transmitted signal after this transmitted signal;
Testing circuit, for detecting the state that is positioned at the button on electronic teacher pointer according to the rate of decay of reflected signal.
Wherein, testing circuit comprises:
Integral unit, for completing for the first time after transmitting at transmission circuit, carries out integration to reflected signal at first integral in the time, obtains first integral value; At transmission circuit, complete for the second time after transmitting, at second integral, in the time, reflected signal is carried out to integration, obtain second integral value; The described first integral time is greater than the described second integral time;
Detecting unit, for detecting the state of the button on electronic teacher pointer according to the ratio of first integral value and second integral value.Described detecting unit comprises: judging unit, for judging the standard ratio range under the ratio of first integral value and second integral value; Determining unit, for according to described relation table, determines the state that is positioned at the button on electronic teacher pointer.
Further, electronic whiteboard also comprises: setting unit, and for setting in advance the standard ratio range relation table corresponding with the state of button of first integral value and second integral value.
Further, described transmission circuit is antenna plate.
An electronic teacher pointer, comprising: electromagnetic oscillation circuit and at least one button;
Described electromagnetic oscillation circuit receives after the transmitted signal of transmission circuit transmitting of electronic whiteboard, to electronic whiteboard, sends reflected signal;
Described button is connected with electromagnetic oscillation circuit, controls the reflected signal frequency that electromagnetic oscillation circuit sends.The different principle of the rate of decay of the utilization of the present invention electromagnetic wave signal that electronic teacher pointer reflects under different key-press status detects the key-press status of electronic teacher pointer, makes the button of user on can direct control electronic teacher pointer just can realize quickly and easily the switching of common function.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of embodiment of electromagnetic oscillation circuit in electronic teacher pointer of the present invention;
Fig. 2 is whether the be pressed comparison schematic diagram of electromagnetic wave signal of time reflection of the button of electronic teacher pointer of the present invention;
Fig. 3 is the process flow diagram of detection method one embodiment of electronic teacher pointer key-press status provided by the invention;
Fig. 4 is the schematic diagram of an embodiment of interactive electric whiteboard provided by the invention;
Fig. 5 is the schematic diagram of another kind of embodiment of the electromagnetic oscillation circuit of electronic teacher pointer provided by the invention.
Embodiment
Below in conjunction with accompanying drawing and preferred implementation, technical solution of the present invention is elaborated.
The invention provides a kind of detection method of electronic teacher pointer key-press status, in the method, electronic teacher pointer and electronic whiteboard are matching used, first, when being pressed, the function key of electronic teacher pointer generates electromagnetic waves, the transmission circuit of electronic whiteboard is according to this electromagnetic wave transmitting transmitted signal, this transmitted signal is the electromagnetic wave signal of certain frequency of the transmission circuit transmitting of electronic whiteboard, after electronic teacher pointer receives this transmitted signal, the electromagnetic oscillation circuit because that it comprises is responded to and generation vibration, reflect thus the electromagnetic wave signal of same frequency, it is the reflected signal (electromagnetic wave signal that following electromagnetic oscillation circuit generation vibration reflects same frequency is all called reflected signal) in receiving step, the transmission circuit of electronic whiteboard can receive the reflected signal that this electronic teacher pointer reflects.When the antenna plate of electronic whiteboard is closed after transmitting, because the quality factor of the electromagnetic oscillation circuit of electronic teacher pointer are very high, still can maintain vibration, and reflect reflected signal to outside, therefore now electronic whiteboard can also receive the reflected signal that electronic teacher pointer reflects.The quality factor here (representing with Q) are the induction reactance value (or capacitor value) of electromagnetic oscillation circuit loop and the ratio of resistance.The rate of decay of the reflected signal that electronic whiteboard reflects according to electronic teacher pointer, detects the state (being detecting step) that is positioned at the button on electronic teacher pointer.
Fig. 1 is the schematic diagram of a kind of embodiment of electromagnetic oscillation circuit in electronic teacher pointer of the present invention.As shown in Figure 1, this electromagnetic oscillation circuit is composed in parallel by coil L, capacitor C and resistance R, and wherein resistance R is connected with a switch S, and switch S connects with corresponding button.When switch S is opened, when button is not pressed, coil L and capacitor C compose in parallel electromagnetic oscillation circuit; When switch S is closed, when button is pressed, coil L, capacitor C and resistance R compose in parallel electromagnetic oscillation circuit.
For the electromagnetic oscillation circuit shown in Fig. 1, when switch S is opened (being that button is not pressed), coil L and capacitor C compose in parallel electromagnetic oscillation circuit, owing to there is no resistance in parallel in circuit, now the Q value of circuit is larger, and the amplitude of the electromagnetic wave signal that circuit resonance back reflection goes out is larger; During switch S closed (being that button is pressed), coil L, capacitor C and resistance R compose in parallel electromagnetic oscillation circuit, and now the Q value of circuit is smaller, and the amplitude of the electromagnetic wave signal that circuit resonance back reflection goes out is also smaller.As shown in Figure 2, the comparison schematic diagram of the electromagnetic wave signal of reflection while whether being pressed for the button of electronic teacher pointer of the present invention, wherein F1 is the electromagnetic wave signal of button while not being pressed, F2 is the electromagnetic wave signal of button while being pressed, for electromagnetic wave signal F1 and the F2 of same frequency, the amplitude of F1 is greater than the amplitude of F2 as can be seen here.When the Q of circuit value hour, the decay meeting of the electromagnetic wave signal of its reflection is than comparatively fast, this is the known technology of this area.The present invention utilizes this principle exactly, and the method for carrying out detected electrons teacher's pointer key-press status according to the rate of decay of the electromagnetic wave signal of reflection is provided.
Further, when the transmission circuit of electronic whiteboard completes after transmitting, electronic whiteboard can also receive the reflected signal that electronic teacher pointer reflects.At twice, complete after transmitting respectively, within different integral time, reflected signal is carried out to integration, obtain two integrated values, the ratio of these two integrated values can characterize the rate of decay of reflected signal, therefore method provided by the invention can, according to the ratio of these two integrated values, detect the key-press status of electronic teacher pointer.
The electromagnetic oscillation circuit shown in Fig. 1 of take is below example, and a kind of embodiment of the detection method of electronic teacher pointer key-press status of the present invention is elaborated.
Fig. 3 is the process flow diagram of detection method one embodiment of electronic teacher pointer key-press status provided by the invention.As shown in Figure 3, this embodiment comprises the following steps:
The transmission circuit transmitting transmitted signal of step 101, electronic whiteboard.
The transmission circuit of electronic whiteboard can be antenna plate, and antenna plate comprises transmission coil and receiving coil, wherein sends coil for launching transmitted signal.After the transmission coil of antenna plate is launched transmitted signal, electronic teacher pointer can reflect the reflected signal of same frequency, and the receiving coil of antenna plate receives reflected signal.If receiving coil does not receive reflected signal, the transmission coil of antenna plate continues transmitting transmitted signal, until receiving coil receives reflected signal.The microprocessor of electronic whiteboard identifies the reflected signal that electronic teacher pointer reflects, and according to this galvanic reflex signal, can detection computations go out electronic teacher pointer with respect to the positional information on electronic whiteboard.
The transmission circuit of step 102, electronic whiteboard completes transmitting for the first time, and electronic whiteboard carries out integration to reflected signal at first integral in the time, obtains first integral value A.
After the volume electromagnetic wave producing when antenna plate senses that electronic pointer function key is pressed, the transmission coil transmitting transmitted signal of antenna plate, when the transmission coil of antenna plate completes after transmitting for the first time, because the electromagnetic oscillation circuit of electronic teacher pointer can maintain vibration, and to outside, reflect the reflected signal of same frequency.Electronic whiteboard carries out integration to this reflected signal at longer first integral of time in the time, obtains first integral value A.
The transmission circuit of step 103, electronic whiteboard continues transmitting transmitted signal.
The transmission circuit of step 104, electronic whiteboard completes transmitting for the second time, and electronic whiteboard carries out integration to reflected signal at second integral in the time, obtains second integral value B.
When the transmission coil of antenna plate completes after transmitting for the second time, because the electromagnetic oscillation circuit of electronic teacher pointer can maintain vibration, and to outside, reflect the reflected signal of same frequency.Electronic whiteboard carries out integration to this reflected signal at shorter second integral of time in the time, obtains second integral value B.Wherein the first integral time is greater than the second integral time.
Step 105, electronic whiteboard detect the key-press status on electronic teacher pointer according to the ratio of first integral value A and second integral value B.
From above-described content, the Q value of circuit when circuit when switch S is opened and switch S are closed is different, the rate of decay of the reflected signal of their reflections is different like this, and the first integral value A that electronic whiteboard obtains so and the ratio of second integral value B are also different.The present embodiment can set in advance the standard ratio range relation table corresponding with the state of button of first integral value and second integral value, can obtain by a large amount of experiments particularly.As: the standard ratio range [c1, c2] of supposing A and B is pressed corresponding to button, and the standard ratio range of A and B [c3, c4] is not pressed corresponding to button, and wherein c2 is less than c3.
The in the situation that of precognition relation table, the standard ratio range under the ratio of the second integral value B that the first integral value A that determining step 102 obtains and step 104 obtain, according to relation table, determines the state that is positioned at the button on electronic teacher pointer.For example,, if A/B in [c1, c2] scope, determines that the state of button is for being pressed; If A/B in [c3, c4] scope, determines that the state of button is not for being pressed.
Finally, electronic whiteboard passes to main frame by the positional information of electronic teacher pointer and status information (being whether button is pressed) by cable, main frame, according to this status information, can carry out function switching, and described function can be the writing of interactive whiteboard, blackboard eraser, left mouse button, right mouse button etc.By the button on operation electronic teacher pointer, realized easily thus the blocked operation of interactive demonstration system common function.
The different principle of the rate of decay of the detection method utilization electromagnetic wave signal that electronic teacher pointer reflects under different key-press status of the electronic teacher pointer key-press status that the present embodiment provides, by the reflected signal under same key-press status, within different integral time, electronic teacher pointer being reflected, carry out integration, according to the ratio of two integrated values, detect the key-press status of electronic teacher pointer, make the button of user on can direct control electronic teacher pointer just can realize quickly and easily the switching of common function.
Fig. 4 is the schematic diagram of an embodiment of interactive electric whiteboard provided by the invention.This interactive electric whiteboard and electronic teacher pointer support the use.As shown in Figure 4, this interactive whiteboard comprises transmission circuit 11 and testing circuit 12.Wherein transmission circuit 11, for launching transmitted signal, receives electronic teacher pointer and receives the reflected signal sending based on transmitted signal after transmitted signal; Testing circuit 12, for according to the rate of decay of reflected signal, detects the state of the button on electronic teacher pointer.
Further, testing circuit 12 comprises integral unit 13 and detecting unit 14, integral unit 13 completes after transmitting for the transmission circuit at electronic whiteboard for the first time, the reflected signal in time, the electromagnetic oscillation circuit of electronic teacher pointer being reflected at first integral carries out integration, obtains first integral value A; Transmission circuit at electronic whiteboard completes after transmitting for the second time, at second integral, in the time, reflected signal is carried out to integration, obtains second integral value B; The described first integral time is greater than the described second integral time; Detecting unit 14 is for detecting the key-press status on electronic teacher pointer according to the ratio of first integral value and second integral value.
Further, interactive electric whiteboard can also comprise setting unit 15, for setting in advance the standard ratio range relation table corresponding with the state of button of first integral value and second integral value.Detecting unit 14 comprises judging unit 16 and determining unit 17, and judging unit 16 is for judging the standard ratio range under the ratio of first integral value and second integral value; Determining unit 17, for according to described relation table, is determined the state that is positioned at the button on electronic teacher pointer.
Above-mentioned transmission circuit 11 can be specially antenna plate, antenna plate comprises transmission coil and receiving coil, wherein send coil for electromagnetic signals, receiving coil receives for receiving electronic teacher pointer the electromagnetic wave signal reflecting after transmission coil institute electromagnetic signals.
Above-mentioned testing circuit 12 and acquiring unit 15 can be a part for the microprocessor of electronic whiteboard.Electronic whiteboard obtains positional information and the status information of electronic teacher pointer, is passed to main frame, and main frame, according to status information, can carry out function switching, and described this function can be the writing of interactive whiteboard, blackboard eraser, left mouse button, right mouse button etc.
The present invention also provides a kind of electronic teacher pointer, and this electronic teacher pointer and electronic whiteboard support the use, and specifically comprises electromagnetic oscillation circuit and at least one button, and the number of this button can be for one or more.
Circuit shown in Fig. 1 is a kind of specific embodiment of the included electromagnetic oscillation circuit of electronic teacher pointer provided by the invention, and it specifically comprises coil L, capacitor C and resistance R parallel with one another, resistance R and switch S series connection, and switch S is connected with the button being positioned on shell.In this embodiment, the button on shell is one, and it realizes the blocked operation of two kinds of functions to multipotency.Particularly, this electromagnetic oscillation circuit receives after the transmitted signal of transmission circuit transmitting of electronic whiteboard, whether the reflected signal to electronic whiteboard reflection based on this transmitted signal, makes electronic whiteboard according to the rate of decay of reflected signal, to detect the state of button, detect button and be pressed.
Fig. 5 is the schematic diagram of another kind of embodiment of the electromagnetic oscillation circuit of electronic teacher pointer provided by the invention.As shown in Figure 5, this electromagnetic oscillation circuit comprises coil L, a capacitor C and n resistance parallel with one another, be respectively R1, R2 ..., Rn.Wherein each resistance is connected with a switch, that is, R1 connects with S1, and R2 connects with S2 ..., Rn connects with Sn.Switch S 1, S2 ..., Sn connects with corresponding button respectively.This electromagnetic oscillation circuit receives after the transmitted signal of transmission circuit transmitting of electronic whiteboard, and the reflected signal to electronic whiteboard reflection based on transmitted signal, makes electronic whiteboard can detect according to the rate of decay of the reflected signal of reflection the state of n button.
In the present embodiment, the resistance of n resistance is different, and the resistance in n resistance after any several resistance parallel connections is also different.Like this under the combination in any state of n button, the Q value that guarantees electromagnetic oscillation circuit is not identical, thereby make the ratio of integrated value of the reflection electromagnetic wave signal that electronic whiteboard obtains not identical, and then make electronic whiteboard can detect according to the ratio of this integrated value the key-press status of electronic teacher pointer.
For the electromagnetic oscillation circuit shown in Fig. 5, the detection method of the electronic teacher pointer key-press status shown in Fig. 3 is also suitable for.Because n button exists several assembled state, the electromagnetic oscillation circuit shown in Fig. 5 also has corresponding several circuit forms, for example: only have switch S 1 closure, other switches are all opened; Only have switch S 1 and S2 closed, other switches are all opened; Only have switch S 1 and S3 closed, other switches are all opened etc.In this case, need to set in advance the corresponding relation of the assembled state of each button and the standard ratio range of first integral value and second integral value, this is to get by a large amount of experimental verifications.By the standard ratio range under the ratio of judgement first integral value and second integral value, according to relation table, can determine the state of n button like this.
Fig. 1 and Fig. 5 only show a kind of basic circuit form of electromagnetic oscillation circuit; the present invention is not limited only to this; on the form basis of this basic circuit, increase other devices (for example increasing the number of coil and electric capacity); but still utilize above-mentioned principle can make electronic whiteboard detect the state of button, all belong to the scope that the present invention protects.
Electronic teacher pointer provided by the invention can be active electronic teacher's pointer, can be also passive electronic teacher's pointer.If passive electronic teacher's pointer, it can receive signal for circuit provides energy by resonant circuit, does not need external power supply, environmental protection.The electromagnetic oscillation circuit of electronic teacher pointer provided by the invention is mimic channel, with low cost, and the method that detects key-press status is simple.
Finally; it should be noted that: what enumerate above is only specific embodiments of the invention; certainly those skilled in the art can change and modification the present invention; if these modifications and modification all should be thought protection scope of the present invention within belonging to the scope of the claims in the present invention and equivalent technologies thereof.
Claims (6)
1. a detection method for electronic teacher pointer key-press status, described electronic teacher pointer and electronic whiteboard support the use, and it is characterized in that, and this detection method comprises:
Step of transmitting, the function key of electronic teacher pointer generates electromagnetic waves while being pressed, the electromagnetic wave transmitting transmitted signal that the transmission circuit of electronic whiteboard produces according to electronic teacher pointer;
Receiving step, electronic teacher pointer sends reflected signal based on transmitted signal after receiving transmitted signal, and the transmission circuit of electronic whiteboard receives this reflected signal;
Detecting step, electronic whiteboard detects the state that is positioned at the button on electronic teacher pointer according to the rate of decay of reflected signal, comprising:
At transmission circuit, complete for the first time after transmitting, at first integral, in the time, reflected signal is carried out to integration, obtain first integral value; At transmission circuit, complete for the second time after transmitting, at second integral, in the time, reflected signal is carried out to integration, obtain second integral value; The described first integral time is greater than the described second integral time;
According to the ratio of first integral value and second integral value, the state of the button on electronic teacher pointer is detected.
2. detection method according to claim 1, is characterized in that, described method also comprises: the standard ratio range relation table corresponding with the state of button that sets in advance first integral value and second integral value;
The described ratio according to first integral value and second integral value detects the state of the button on electronic teacher pointer, comprising:
Judge the affiliated standard ratio range of ratio of first integral value and second integral value;
According to described relation table, determine the state that is positioned at the button on electronic teacher pointer.
3. an interactive electric whiteboard, is characterized in that, described electronic whiteboard comprises:
Transmission circuit, for launching transmitted signal according to the electromagnetic wave of electronic teacher pointer, and reception electronic teacher pointer receives the reflected signal sending based on this transmitted signal after this transmitted signal;
Testing circuit, for detect the state that is positioned at the button on electronic teacher pointer according to the rate of decay of reflected signal, comprising:
Integral unit, for completing for the first time after transmitting at transmission circuit, carries out integration to reflected signal at first integral in the time, obtains first integral value; At transmission circuit, complete for the second time after transmitting, at second integral, in the time, reflected signal is carried out to integration, obtain second integral value; The described first integral time is greater than the described second integral time;
Detecting unit, for detecting the state of the button on electronic teacher pointer according to the ratio of first integral value and second integral value.
4. interactive electric whiteboard according to claim 3, is characterized in that, described electronic whiteboard also comprises: setting unit, and for obtaining in advance the standard ratio range relation table corresponding with the state of button of first integral value and second integral value.
5. interactive electric whiteboard according to claim 4, is characterized in that, described detecting unit comprises:
Judging unit, for judging the standard ratio range under the ratio of first integral value and second integral value;
Determining unit, for according to described relation table, determines the state that is positioned at the button on electronic teacher pointer.
6. interactive electric whiteboard according to claim 3, is characterized in that, described transmission circuit is antenna plate.
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| CN201110181943.5A CN102854460B (en) | 2011-06-30 | 2011-06-30 | Key state detection method for electronic pointer, electronic white board and electronic pointer |
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| CN201110181943.5A CN102854460B (en) | 2011-06-30 | 2011-06-30 | Key state detection method for electronic pointer, electronic white board and electronic pointer |
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| CN102854460B true CN102854460B (en) | 2014-12-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0651905A (en) * | 1992-07-28 | 1994-02-25 | Seiko Epson Corp | Liquid crystal display device with integrated tablet |
| KR100459230B1 (en) * | 2002-11-14 | 2004-12-03 | 엘지.필립스 엘시디 주식회사 | touch panel for display device |
| CN100451933C (en) * | 2006-01-10 | 2009-01-14 | 凌广有 | Electronic teacher pointer |
| CN101071344A (en) * | 2006-05-12 | 2007-11-14 | 深圳市巨龙科教高技术股份有限公司 | Electronic pen for interactive electronic white board |
| US8411053B2 (en) * | 2008-12-18 | 2013-04-02 | Einstruction Corporation | Dual pen interactive whiteboard system |
| CN101539816B (en) * | 2009-04-16 | 2012-10-17 | 台均科技（深圳）有限公司 | Electromagnetic pen, electromagnetic signal transmitting method, processing method, device and equipment |
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