CN103997632A - Electronic whiteboard and projection system - Google Patents
Electronic whiteboard and projection system Download PDFInfo
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- CN103997632A CN103997632A CN201410229335.0A CN201410229335A CN103997632A CN 103997632 A CN103997632 A CN 103997632A CN 201410229335 A CN201410229335 A CN 201410229335A CN 103997632 A CN103997632 A CN 103997632A
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- electronic whiteboard
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Abstract
The embodiment of the invention provides an electronic whiteboard and a projection system, and relates to the field of electronics. Interaction of the projection system and a user is achieved while the cost of the electronic whiteboard is lowered. The electronic whiteboard comprises a first panel and a plurality of driving modules. The driving modules are arranged on one side of the first panel in an array mode. The driving modules comprise inductors, switching circuits and light-emitting diodes. The inductors induce electromagnetic signals and generate induction currents. The switching circuits conduct rectification on the induction currents. The rectified induction currents trigger the light-emitting diodes to emit light signals.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of electronic whiteboard and optical projection system.
Background technology
Interactive electric whiteboard is the Digital Teaching demonstration equipment of a kind of alternative traditional blackboard and chalk.Interactive electric whiteboard can depart from mouse and keyboard completely, uses finger or specific pen to realize operations such as the editor of computer documents, annotation and preservations on electronic whiteboard, thereby brings great convenience to user.
In the prior art, interactive electric whiteboard adopts additional input to shield to realize man-machine interaction conventionally.Wherein, input screen can be divided into condenser type input screen, resistance-type input screen, or infrared technique input screen etc.Condenser type input screen is the screen body consisting of four layers of combined screen: the ground floor of outermost is glassivation, and the second layer is conductive layer, and the 3rd layer is nonconducting glassy layer, and interior the 4th layer is also conductive layer.The structure of resistance-type input screen is to consist of film, glass and the ITO in the film one side adjacent with glass (Indium Tin Oxide, nano indium tin metal oxide) coating.The structure of infrared technique input screen forms by being contained in the infrared emitting sensing element on touch-screen housing and receiving sensing element.This shows, condenser type input screen, the complex structure of resistance-type input screen and infrared technique input screen, causes the cost of electronic whiteboard higher; Expensive due to the element using or material again, thus the cost of electronic whiteboard further increased.And the electronic whiteboard function that on market, some prices are cheaper is single, be difficult to the mutual of realization and user.
Summary of the invention
Embodiments of the invention provide a kind of electronic whiteboard and optical projection system, when reducing the cost of electronic whiteboard, can realize again the mutual of optical projection system and user.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The embodiment of the present invention provides a kind of electronic whiteboard, comprising: the first panel and a plurality of driver module; Described a plurality of driver module array arrangement is in a side of described the first panel; Described driver module comprises inductance, change-over circuit and light-emitting diode, and described inductance inductive electromagnetic signal also produces induced current, and described change-over circuit carries out rectification to described induced current, and the induced current after rectification triggers described light-emitting diode utilizing emitted light signal.
Optionally, the two ends of described inductance are connected with two inputs of described change-over circuit respectively; The positive pole of described light-emitting diode is connected with the cathode output end of described change-over circuit; The negative pole of described light-emitting diode is connected with the cathode output end of described change-over circuit.
Optionally, described driver module also comprises: resistance and electric capacity; The cathode output end of described change-over circuit is connected with the positive pole of described light-emitting diode by described resistance; The negative pole of described electric capacity is connected with the negative pole of described light-emitting diode; The positive pole of described electric capacity is connected with the positive pole of described light-emitting diode.
Optionally, also comprise: the second panel; Described a plurality of driver module is between described the first panel and described the second panel.
Optionally, described the second panel comprises the panel of transparent material.
The embodiment of the present invention provides a kind of optical projection system, comprising: electronic whiteboard, picture pick-up device, treatment facility and projector equipment; Described electronic whiteboard is the electronic whiteboard described in above-described embodiment, according to the electromagnetic signal sensing, triggers light-emitting diode utilizing emitted light signal; Described picture pick-up device, for obtaining the image information of described electronic whiteboard; Described treatment facility, adjusts described projection information for generation of projection information and according to described image information; Described projector equipment, for being projected to described electronic whiteboard by the projection information after adjusting.
Optionally, described treatment facility, specifically for described image information is processed, obtains the coordinate information of described light signal, and according to described coordinate information, described projection information is adjusted.
Optionally, described treatment facility, specifically for described image information is processed, obtains the motion track of described light signal, and according to described motion track, described projection information is adjusted.
Optionally, described picture pick-up device comprises charge coupled cell CCD.
The embodiment of the present invention provides a kind of electronic whiteboard and optical projection system, described electronic whiteboard comprises: the first panel and a plurality of driver module, wherein, a plurality of driver module array arrangements are in a side of the first panel, a plurality of driver modules comprise inductance, change-over circuit and light-emitting diode, inductance is for inductive electromagnetic signal, and at inductance two ends generation induced current, now, the induced current producing is alternating current, so this induced current need to be inputed to, carries out rectification in change-over circuit, and then by the direct current triggering light-emitting diode utilizing emitted light signal after rectification.Can find out that electronic whiteboard that the present invention designs is only by a panel and by inductance, change-over circuit, the driver module that light-emitting diode forms forms, and the low price of its material and components and parts is simple in structure, thereby has reduced the cost of electronic whiteboard.The optical projection system that the embodiment of the present invention provides, by picture pick-up device, obtain the image information of electronic whiteboard, according to this image information, obtain user for the operational order of electronic whiteboard, and this instruction is made to response, electronic whiteboard is adjusted and be projected to projection information, thereby realize man-machine interactive operation.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of a kind of electronic whiteboard that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the another kind of electronic whiteboard that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the circuit diagram of a kind of driver module of the electronic whiteboard shown in Fig. 1;
Fig. 4 is the circuit diagram of the another kind of driver module of the electronic whiteboard shown in Fig. 1;
The structural representation of a kind of optical projection system that Fig. 5 provides for the embodiment of the present invention;
The practical circuit figure of a kind of transmitter that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of electronic whiteboard, as shown in Figure 1, comprising: the first panel 101 and a plurality of driver module 102.
Described a plurality of driver module 102 array arrangements are in a side of described the first panel 101.
Preferably, described the first panel 101 comprises the panel of transparent material, for example acrylic board.
It should be noted that, described the first panel 101 can also be the panel of other non-transparent material, for example, curtain, as long as can show that the panel of projection information is all passable, the present invention is not restricted this.
It should be noted that, preferred, described a plurality of driver modules 102 and the parallel placement of described the first panel 101, and described a plurality of driver module 102 is fixed on a side of described the first panel 101.Concrete fixed form the present invention does not limit, and for example, can adopt double-screw bolt that described a plurality of driver modules 102 are fixing with described the first panel 101; Or described a plurality of driver modules 102 are fixing etc. by draw-in groove and described the first panel 101.
Further, described electronic whiteboard, as shown in Figure 2, also comprises: the second panel 103.
Described a plurality of driver module 102 is between described the first panel 101 and described the second panel 103.
Wherein, described the second panel 103 comprises the panel of transparent material, for example acrylic board.
Described driver module 102, as shown in Figure 3, comprises inductance 1021, change-over circuit 1022 and light-emitting diode 1023.
The two ends of described inductance 1021 are connected with two inputs of described change-over circuit 1011 respectively; The positive pole of described light-emitting diode 1023 is connected with the cathode output end of described change-over circuit 1011; The negative pole of described light-emitting diode 1023 is connected with the cathode output end of described change-over circuit 1011.
Preferably, described a plurality of driver modules 102 and the parallel placement of described the second panel 103, and described a plurality of driver module 102 is fixed on a side of described the second panel 103.Concrete fixed form the present invention does not limit, and for example, can adopt double-screw bolt that described a plurality of driver modules 102 are fixing with described the second panel 103; Or described a plurality of driver modules 102 are fixing etc. by draw-in groove and described the second panel 103.
Preferably, described change-over circuit 1022 comprises: bridge rectifier.
It should be noted that, described change-over circuit 1022 can also be other circuit, for example: and rectifier diode, or half-wave rectifying circuit, or full-wave rectifying circuit etc., the present invention is not restricted this.
It should be noted that, described a plurality of driver modules 102 can be integrated at least one circuit printing plate.Preferably, described a plurality of driver module 102 is integrated in a printed circuit board.
The opposite side of described the first panel 101, for showing the projection information of projector equipment projection.
Described inductance 1021 inductive electromagnetic signals also produce induced current, and 1022 pairs of described induced currents of described change-over circuit carry out rectification, and the induced current after rectification triggers described light-emitting diode 1023 utilizing emitted light signals.
Described the second panel 103, for the light signal of light-emitting diode described in transmission 1023.
Concrete, if the opposite side of described the first panel 101 shows the projection information of projector equipment projection, now, when user if desired edits projection information, can by opening transmitter, carry out transmission of electromagnetic signals according to the content that projection information is edited, owing to there being inductance 1021 in driver module 102, thereby this inductance 1021 can receive the electromagnetic signal of transmitter transmitting, and then produce induced current at inductance 1021 two ends, because the induced current now producing is alternating current, so alternating current need to be inputed to two inputs of change-over circuit 1022, carry out rectification, thereby two output output direct currents at change-over circuit 1022, positive and negative grade of cathode output end and the cathode output end that is connected to change-over circuit 1022 due to light-emitting diode 1023, therefore, this direct current can be by described light-emitting diode 1023 conductings, trigger described light-emitting diode 1023 utilizing emitted light signals.
It should be noted that, when the opposite side of described the first panel 101 does not show the projection information of projector equipment projection, user also can carry out transmission of electromagnetic signals by transmitter, and then the described light-emitting diode 1023 utilizing emitted light signals of 1021 triggering of the inductance in driver module 102, the present invention does not limit this.
Further, described driver module 102, as shown in Figure 4, also comprises: resistance 1024 and electric capacity 1025.
The cathode output end of described change-over circuit 1022 is connected with the positive pole of described light-emitting diode 1023 by described resistance 1024; The negative pole of described electric capacity 1025 is connected with the negative pole of described light-emitting diode 1023; The positive pole of described electric capacity 1025 is connected with the positive pole of described light-emitting diode 1023.
It should be noted that, described resistance 1024 and described electric capacity 1025 are the element of the described light-emitting diode 1023 of protection, prevent that described light-emitting diode 1023 from burning out when electric current is excessive.
The embodiment of the present invention provides a kind of electronic whiteboard, comprise: the first panel and a plurality of driver module, wherein, a plurality of driver module array arrangements are in a side of the first panel, a plurality of driver modules comprise inductance, change-over circuit and light-emitting diode, inductance is for inductive electromagnetic signal, and at inductance two ends generation induced current, now, the induced current producing is alternating current, so this induced current need to be inputed to, carries out rectification in change-over circuit, and then by the direct current triggering light-emitting diode utilizing emitted light signal after rectification.Can find out that electronic whiteboard that the present invention designs is only by a panel and by inductance, change-over circuit, the driver module that light-emitting diode forms forms, and the low price of its material and components and parts is simple in structure, thereby has reduced the cost of electronic whiteboard.
The embodiment of the present invention provides a kind of optical projection system, as shown in Figure 5, comprising: electronic whiteboard 501, treatment facility 502, projector equipment 503, picture pick-up device 504.
Wherein, described treatment facility 502 is connected with described projector equipment 503.
It should be noted that, described treatment facility 502 is connected and can connects by holding wire with described projector equipment 503, can be also wireless connections, and the present invention does not limit this.
Described electronic whiteboard 501 is the electronic whiteboard described in above-described embodiment.
Described electronic whiteboard 501, for triggering light-emitting diode 1023 utilizing emitted light signals according to the electromagnetic signal sensing.
Concrete, described electronic whiteboard 501 is when receiving electromagnetic signal, be that inductance 1021 is while receiving electromagnetic signal, at inductance 1021 two ends, produce induced current, because the induced current now producing is alternating current, so alternating current need to be inputed to two inputs of change-over circuit 1022, carry out rectification, thereby two output output direct currents at change-over circuit 1022, positive and negative grade of cathode output end and the cathode output end that is connected to change-over circuit 1022 due to light-emitting diode 1023, therefore, this direct current can be by described light-emitting diode 1023 conductings, trigger described light-emitting diode 1023 utilizing emitted light signals.
It should be noted that, the electromagnetic signal that described electronic whiteboard 501 receives is that the transmitter of holding in user's hand sends, when this transmitter need to be not less than predeterminable range in the position of the described electronic whiteboard 501 of distance, the content transmission of electromagnetic signals of projection information being edited according to user.When if the position of the described electronic whiteboard 501 of transmitter distance is greater than predeterminable range, the electromagnetic signal of transmitter transmitting can not be received by described electronic whiteboard 501.
It should be noted that, the content that the present invention edits projection information does not limit, for example, can add underscore to the passage of appointing in projection information, or the word in projection information is modified, or to the simple point-like information of the interpolation in projection information, such as round dot etc.
It should be noted that, the circuit of transmitter transmission of electromagnetic signals can adopt multiple circuit to realize, exemplary, and the circuit of transmission of electromagnetic signals that can be by is as shown in Figure 6 realized.
Described picture pick-up device 504, for obtaining the image information of described electronic whiteboard 501.
Wherein, described picture pick-up device 504 is positioned at the opposite side of described the first panel 101.
Preferably, described picture pick-up device 504 comprises CCD (Charge Coupled Device, charge coupled cell).
It should be noted that, described picture pick-up device 504 can also have for other equipment of camera function, video camera for example, and the present invention does not limit this.
Described treatment facility 502, adjusts described projection information for generation of projection information and according to described image information.
Concrete, described treatment facility 502 is according to the difference of the image information of the electronic whiteboard obtaining, also different, specific as follows to the processing method of image information:
When described image information is point-like information, described treatment facility 502, specifically for described image information is processed, obtains the coordinate information of described light signal, and according to described coordinate information, described projection information is adjusted.
That is to say, when described image information is point-like information, described treatment facility 502 carries out distortion correction by each two field picture of point-like information, the operations such as the contrast enhancing of image, then pretreated image is carried out to Threshold segmentation, because light-emitting diode 1023 is lit, so the gray value of the position at light-emitting diode 1023 places that are lit is apparently higher than the gray value of other positions in image, now, the image that Threshold segmentation is processed in continuation carries out binary conversion treatment, the position at light-emitting diode 1023 places that are lit has become white, gray value is 255, other positions of image have become black, gray value is 0, and ask for the barycenter of white portion, coordinate using asked for center-of-mass coordinate as the light-emitting diode 1023 being lit, finally the center-of-mass coordinate of the light-emitting diode in the image information obtaining 1023 is converted into real screen coordinate, and can add coordinates correction algorithm, make the actual screen error of coordinate that calculates less, thereby determine the coordinate information of point-like information, and according to this coordinate information, projection information is operated, complete the editor to projection information, further the projection information after editor is sent to described projector equipment 503.
In described image information, be while having the image of motion track, described treatment facility, specifically for described image information is processed, obtains the motion track of described light signal, and according to described motion track, described projection information is adjusted.
That is to say, in described image information, be while thering is the image of motion track, described treatment facility 502 carries out distortion correction by each two field picture of this image information, the operations such as the contrast enhancing of image, then pretreated image is carried out to Threshold segmentation, because light-emitting diode 1023 is lit, so the gray value of the position at light-emitting diode 1023 places that are lit is apparently higher than the gray value of other positions in image, now, the image that Threshold segmentation is processed in continuation carries out binary conversion treatment, the position at light-emitting diode 1023 places that are lit has become white, gray value is 255, other positions of image have become black, gray value is 0, and ask for the barycenter of white portion, coordinate using asked for center-of-mass coordinate as the light-emitting diode 1023 being lit, finally the center-of-mass coordinate of the light-emitting diode in the image information obtaining 1023 is converted into real screen coordinate, and can add coordinates correction algorithm, make the actual screen error of coordinate that calculates less, after determining the actual screen coordinate of all light-emitting diodes that are lit 1023, can determine the motion track of transmitter, and according to definite motion track, projection information is operated, complete the editor to projection information, further the projection information after editor is sent to described projector equipment 503.
It should be noted that, described treatment facility 503 can also be determined coordinate information and the motion track of described light signal according to additive method, and the present invention does not limit this.
Described projector equipment 503, for being projected to described electronic whiteboard 501 by the projection information after adjusting.
Wherein, described projector equipment 503 is positioned at the opposite side of described the first panel 101.
It should be noted that, described treatment facility 502 and described projector equipment 503 can or can not be also physically to separate, that is to say, described treatment facility 502 can be integrated on Same Physical equipment with described projector equipment 503, also can be respectively two different physical equipments.The present invention does not limit this.
The embodiment of the present invention provides a kind of optical projection system, and described system comprises: electronic whiteboard, treatment facility, projector equipment, and picture pick-up device; Wherein, electronic whiteboard comprises: the first panel and a plurality of driver module, and a plurality of driver module array arrangements are in a side of the first panel, and a plurality of driver modules comprise inductance, change-over circuit and light-emitting diode, inductance is for inductive electromagnetic signal, and at inductance two ends, produce induced current, now, the induced current of generation is alternating current, so this induced current need to be inputed to, in change-over circuit, carry out rectification, and then trigger light-emitting diode utilizing emitted light signal by the direct current after rectification; Picture pick-up device, for obtaining the image information of electronic whiteboard, and this image information is sent to treatment facility, by treatment facility, according to this image information, adjust projection information, and the projection information after adjusting is sent to projector equipment, finally by projector equipment, the projection information after adjusting is projected to electronic whiteboard, thereby realizes man-machine interactive operation.Can find out that the electronic whiteboard of the optical projection system employing in the present invention is only by a panel and by inductance, change-over circuit, the driver module that light-emitting diode forms forms, the low price of its material and components and parts, simple in structure, thereby reduced the cost of electronic whiteboard, further reduced the cost of optical projection system.
In the several embodiment that provide in the application, should be understood that, disclosed system, apparatus and method, can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual realization, can have other dividing mode, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit comprises, also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that also can adopt hardware to add SFU software functional unit realizes.
The integrated unit that the above-mentioned form with SFU software functional unit realizes, can be stored in a computer read/write memory medium.Above-mentioned SFU software functional unit is stored in a storage medium, comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the part steps of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read-Only Memory, be called for short ROM), the various media that can be program code stored such as random access memory (Random Access Memory is called for short RAM), magnetic disc or CD.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. an electronic whiteboard, is characterized in that, comprising: the first panel and a plurality of driver module;
Described a plurality of driver module array arrangement is in a side of described the first panel;
Described driver module comprises inductance, change-over circuit and light-emitting diode, and described inductance inductive electromagnetic signal also produces induced current, and described change-over circuit carries out rectification to described induced current, and the induced current after rectification triggers described light-emitting diode utilizing emitted light signal.
2. electronic whiteboard according to claim 1, is characterized in that,
The two ends of described inductance are connected with two inputs of described change-over circuit respectively; The positive pole of described light-emitting diode is connected with the cathode output end of described change-over circuit; The negative pole of described light-emitting diode is connected with the cathode output end of described change-over circuit.
3. electronic whiteboard according to claim 2, is characterized in that, described driver module also comprises: resistance and electric capacity;
The cathode output end of described change-over circuit is connected with the positive pole of described light-emitting diode by described resistance; The negative pole of described electric capacity is connected with the negative pole of described light-emitting diode; The positive pole of described electric capacity is connected with the positive pole of described light-emitting diode.
4. according to the electronic whiteboard described in claim 2 or 3, it is characterized in that, described change-over circuit comprises: bridge rectifier.
5. according to the electronic whiteboard described in claim 2 or 3, it is characterized in that, also comprise: the second panel;
Described a plurality of driver module is between described the first panel and described the second panel.
6. electronic whiteboard according to claim 5, is characterized in that,
Described the second panel comprises the panel of transparent material.
7. an optical projection system, is characterized in that, described system comprises: electronic whiteboard, picture pick-up device, treatment facility and projector equipment;
Described electronic whiteboard is the electronic whiteboard described in claim 1-6 any one, according to the electromagnetic signal sensing, triggers light-emitting diode utilizing emitted light signal;
Described picture pick-up device, for obtaining the image information of described electronic whiteboard;
Described treatment facility, adjusts described projection information for generation of projection information and according to described image information;
Described projector equipment, for being projected to described electronic whiteboard by the projection information after adjusting.
8. system according to claim 7, is characterized in that,
Described treatment facility, specifically for described image information is processed, obtains the coordinate information of described light signal, and according to described coordinate information, described projection information is adjusted.
9. system according to claim 7, is characterized in that,
Described treatment facility, specifically for described image information is processed, obtains the motion track of described light signal, and according to described motion track, described projection information is adjusted.
10. according to the system described in claim 7-9 any one, it is characterized in that, described picture pick-up device comprises charge coupled cell CCD.
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| CN201410229335.0A CN103997632B (en) | 2014-05-27 | 2014-05-27 | A kind of electronic whiteboard and optical projection system |
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| CN201410229335.0A CN103997632B (en) | 2014-05-27 | 2014-05-27 | A kind of electronic whiteboard and optical projection system |
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| CN103997632B (en) | 2016-09-07 |
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