CN101963856A - Input device with multiple input modes - Google Patents
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- CN101963856A CN101963856A CN 201010117095 CN201010117095A CN101963856A CN 101963856 A CN101963856 A CN 101963856A CN 201010117095 CN201010117095 CN 201010117095 CN 201010117095 A CN201010117095 A CN 201010117095A CN 101963856 A CN101963856 A CN 101963856A
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Abstract
The invention relates to an input device with multiple input modes, which comprises an electromagnetic input structure, a touch control input structure, a first microcontroller, a second microcontroller and a main controller, wherein the electromagnetic input structure is used for inputting by a user with an electromagnetic pen; the touch control input structure is used for inputting by the user with fingers or a pen and other devices in a touch control mode; the first microcontroller is used for controlling the electromagnetic input structure; the second microcontroller is used for controlling the touch control input structure; and the main controller is used for controlling the first microcontroller and the second microcontroller. The invention combines the advantages of the electromagnetic induction input mode and the touch control input mode, and the touch control mode has the advantages of increased resolution and multipoint input.
Description
Technical field
The present invention relates to a kind of input media, particularly relate to a kind of input media with multiple input mode.
Background technology
Be used for mainly comprising Aristogrid (digitizer), digiboard (tablet), electronic whiteboard (white board) or the like with the input media of handwriting input for the user, its common input mode of these input medias has electromagnetic induction and touch-control dual mode.Induction mainly is a collocation special electromagnetic pen (stylus) in the use, the user is covered with in inside with time writer on the input media of antenna loop array and writes, draws, or import in modes such as the switch on the compressing pen, buttons, the antenna loop array antenna of close time writer will be sensed the strongest electromagnetic signal, thereby learn the coordinate position of time writer.In addition, when touching nib, will produce the variation of inductance value by inductance capacitance (LC) the concussion circuit of being formed in the time writer, thus make shake frequency also with change; The variation of the big more then inductance value of pressure of collision nib is big more, thereby the variable quantity of concussion frequency is big more, so imposed on the size of pen point pressure as can be known by the size of frequency variation.In like manner, the joint of the button of time writer leaves the transmission frequency that produces changes in capacitance in the inductance capacitance oscillator and change pen, changes why can predict button that the user presses by the difference of frequency.
And the electronic whiteboard of touch comprises a polymeric membrane substrate usually and a glass substrate is layered arrangement, and two relative between two substrates surfaces have the conducting wire layer, and many small septs are arranged between the two substrates to separate the conducting wire layer of two substrates.When the polymeric membrane substrate touched in a certain position, input media can electrically detect the contact of two conducting wire layers, and provide about pressing the information of position, for example capacitance or resistance value give a treating apparatus for example a PC to calculate the coordinate that presses the position.
Above-mentioned two kinds of input modes respectively have relative merits.Its resolution of induction input media is higher, but needs the special electromagnetic pen to operate.The specific time writer and the input media of touch need not arranged in pairs or groups, can use finger-tip operated, but its resolution of traditional touch-control input device can't reach more than the 500dpi, can't accomplish that also multiple spot imports simultaneously, just can't import plural coordinate figure simultaneously.
This shows that above-mentioned existing input media obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of input media, can possess the advantage of two kinds of input modes simultaneously, and improve the resolution of touch-control input, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The resolution that the object of the present invention is to provide a kind of input media to have the advantage of electromagnetic induction and two kinds of input modes of touch-control and touch control manner concurrently improves and can the multiple spot input.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.A kind of input media with multiple input mode according to the present invention proposes comprises: an electromagnetism input structure, import with a time writer for the user; One touch-control input structure is imported with touch control manner with finger or pen device for the user; One first microcontroller, the coordinate information that is used to control this electromagnetism input structure and obtains this time writer; One second microcontroller is used to control this touch-control input structure and obtains the coordinate information that touch-control is imported; One master controller is used to control this first microcontroller and this second microcontroller; And a computer, be used to handle the coordinate information that this master controller transmits.
Purpose of the present invention and solve its technical matters and can also be further achieved by the following technical measures.
Aforesaid input media with multiple input mode, wherein said input media also comprises a writing surface and is used for writing for the user, and the surface of this electromagnetism input structure is furnished with an XY antenna loop array with equidistant arrangement mode, this XY antenna loop array is used to receive the electromagnetic wave signal that this time writer is launched, each antenna that this first microcontroller switches this XY antenna loop array is with the electromagnetic wave signal responding to this time writer and send and pass this first microcontroller back, this first microcontroller is according to the intensity and the frequency change of electromagnetic wave signal, calculate the coordinate and the force value of this time writer, the button that perhaps user pressed why.
Aforesaid input media with multiple input mode, wherein said touch-control input structure comprises one first substrate and one second substrate, this first substrate and this second substrate are insulation material film, the surface arrangement of this first substrate has one first conducting wire, the surface arrangement of this second substrate has one second conducting wire, wherein this first conducting wire and this second conducting wire face one another, and are separated by a plurality of separating balls.
Aforesaid input media with multiple input mode, wherein the material of this first substrate and this second substrate comprises polyethylene terephthalate (Polyethylene Terephthalate).
Aforesaid input media with multiple input mode, wherein the material of this first conducting circuit and this second conducting circuit comprises elargol (Colloidal Carbon) and carbon.
Aforesaid input media with multiple input mode, wherein said first conducting wire comprises x0, x1, x2 ... in circuit independently separately, this second conducting wire comprises y0, y1, y2 ... in circuit independently separately, this first conducting wire and this second conducting wire intersect at a plurality of lattice points, this second microcontroller gives this first conducting wire a fixed voltage value in regular turn, detect simultaneously the magnitude of voltage of this second conducting wire in regular turn, when the user presses this writing surface in one or more lattice point with finger or pen device, can detect one or more analog voltage value, become one or more digital voltage value via one analogy/digital conversion circuit conversion and standardization (normalized), utilize the longer voltage that is detected of guiding path (routine) the little principle that heals, can calculate the coordinate of these one or more lattice points that the user pushes.
Aforesaid input media with multiple input mode, wherein this electromagnetism input structure and this touch-control input structure also comprise control circuit separately, and two control circuits are incorporated in same circuit board.
Aforesaid input media with multiple input mode, wherein said this touch-control input structure comprises a plurality of infrared transmitter and infrared ray receiver, user's one or more contact point makes corresponding infrared ray receiver can not receive signal, so can know the coordinate of this contact point.
Aforesaid input media with multiple input mode, wherein said touch-control input structure comprises a plurality of infrared transmitter and a plurality of image sensor (image sensor), user's one or more contact point changes the reception image of this image sensor, can know the coordinate of this contact point in view of the above.
Aforesaid input media with multiple input mode is crossed the track that a projector shows user's input in wherein said computer expert.
Aforesaid input media with multiple input mode, wherein the transmission between this master controller and this computer is to transmit in wired or wireless mode.
Aforesaid input media with multiple input mode, wherein said master controller are carried out a program to control this first microcontroller and this second microcontroller, and this program comprises the following step: initialization; Carry out universe scanning, be used to obtain the position of time writer; Judge whether this universe scanning receives signal, if receive signal, carries out a sector scanning, with motion track and the coordinates computed of following the trail of this time writer, if do not receive signal, carries out a touch detection; Judge whether this sector scanning receives signal,,, then get back to this universe scanning if do not receive signal if receive signal then output coordinate data and continue to carry out this sector scanning; And judge whether this touch detection receives signal, if receive signal, then output coordinate data and continue to carry out this touch detection if do not receive signal, are then got back to this universe scanning.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, the input media that the present invention has multiple input mode has following advantage and beneficial effect at least: according to input media provided by the invention, the user can freely select with time writer input or can be multiple spot input (multi-touch) with touch control manner input, touch-control, and resolution can improve via the layout density that improves the conducting wire, therefore not only have the advantage of two kinds of input modes concurrently, and improve the usefulness of touch-control input.
In sum, the present invention's resolution of having the advantage of electromagnetic induction and two kinds of input modes of touch-control and touch control manner concurrently improves and can the multiple spot input.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 to Fig. 2 shows the input media synoptic diagram of the embodiment of the invention.
Fig. 3 to Fig. 4 shows the touch detection synoptic diagram of the input media of the embodiment of the invention.
Fig. 5 A to Fig. 6 B shows the touch detection method synoptic diagram of the input media of preferred embodiment of the present invention.
Fig. 7 shows an executive routine process flow diagram of the primary controller of embodiment of the invention input media.
10: input media 11: computer
12: 13: the first microcontrollers of master controller
16: touch-control input structure 20: writing surface
23: the first conducting wires of 22: the first substrates
24: 25: the second conducting wires of separating ball
28: infrared receiver 29: contact point
30: infrared transmitter 31: image sensor
40: initialization 41: universe scanning
42: whether receive signal 43: sector scanning
44: touch detection 45: whether receive signal
46: whether receive signal
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of the input media with multiple input mode, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to get one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
As shown in Figure 1, show the input media synoptic diagram that the embodiment of the invention has multiple input mode.Input media 10 includes an electromagnetism input structure 15 and a touch-control input structure 16, and a computer 11, a master controller 12, one first microcontroller 13, one second microcontroller 14 of collocation use.The user can use a time writer (not shown) with the way of electromagnetic induction input, also can select to import with touch control manner with other objects of finger or pen or any non-above-mentioned time writer.Why and control coordinate, computer 11 that coordinate that first microcontroller 13 and second microcontroller 14, first microcontroller, 13 devices are used to control this electromagnetism input structure 15 and obtain time writer is used to control touch-control input structure 16 with force value, second microcontroller 14 and obtains the touch-control input and be used to handle information such as the coordinate that obtained and force value the input mode that master controller 12 is used to detect the user and can show the track that the user imports by a projector (not shown).
Wherein master controller 12 and other elements for example the transmission between the computer 11 can be wired or wireless mode, for example universal serial bus (USB) interface, serial port agreement (RS-232) interface, blue bud (Bluetooth) interface, wireless (Wireless) transmission or the like.In addition, first microcontroller 13 and second microcontroller 14 also can be incorporated in the master controller 12, even the work of being responsible at first microcontroller 13, second microcontroller 14, master controller 12 all can be integrated in computer 11, these technology field under the present invention all belongs to and can finish easily, also all belongs in the scope of the present invention.
Fig. 2 shows the structural representation of embodiment of the invention input media, electromagnetism input structure 15 and touch-control input structure 16 that input media 10 includes a writing surface 20 at least and mentions in Fig. 1.Writing surface 20 is used for writing for the user.The surface of electromagnetism input structure 16 is furnished with XY antenna loop array (not shown) with equidistant arrangement mode, and XY antenna loop array is used to receive the electromagnetic wave signal that time writer is launched.When the user is writing or drawing on the writing surface 20 or by the button on starting writing with time writer, the electromagnetic wave signal that each antenna that first microcontroller 13 switches XY antenna loop arrays sends with the induced electricity magnetic pen is also passed first microcontroller 13 back, first microcontroller 13 is according to electromagnetic intensity or frequency change, can calculate the coordinate and the force value of time writer, perhaps the button that the user pressed why.In the present invention, electromagnetism input structure 15 is not limited to the above, and any known electromagnetism input structure and method all can be applicable among the present invention.For example, the present invention also can use the technology contents with applicant disclosed TaiWan, China patent announcement I266244 or TaiWan, China patent publication No. 200539006 with the present invention, and its description is incorporated this paper into, is considered as the part of this case instructions.
In addition, touch-control input structure 16 as Fig. 2 embodiment comprises one first substrate 22 and one second substrate 26, first substrate 22 and second substrate 26 are insulation material film, for example polyethylene terephthalate (Polyethylene Terephthalate) or other materials, perhaps, two substrates also can be made by unlike material respectively.In addition, the surface arrangement of first substrate 22 has the surface arrangement of one first conducting wire, 23, the second substrates 26 that one second conducting wire 25 is arranged, and wherein first conducting wire 23 and second conducting wire 25 face one another, and are separated by a plurality of small separating balls 24.When the user presses writing surface 20 in a certain position with finger, pen device, make first conducting wire 23 of this position contact with second conducting wire 25, therefore provide voltage or other information to pass second microcontroller 14 back, calculate the coordinate of user's input according to this.
Touch-control input structure 16 also can be other any forms, for example, the infrared touch control input, Fig. 3 and Fig. 4 disclose two kinds of infrared touch control input structures of the embodiment of the invention.In Fig. 3, touch-control input structure 16 comprises the infrared transmitter 27 and infrared ray receiver 28 of a plurality of directive property, be arranged at directions X and Y direction respectively, (one or more) contact point 29 of user makes corresponding infrared ray receiver 29 can not receive signal, so can know the coordinate of contact point 29.In Fig. 4, touch-control input structure 16 comprises a plurality of infrared transmitter 30 and is arranged at corner (or other positions) respectively with image sensor (image sensor) 31.Image sensor 31 is charge coupled cell (CCD for example, Charge-Coupled Device) or complementary metal oxide semiconductor (CMOS), (one or more) contact point 29 of user changes its reception image, can know the coordinate of contact point 29 in view of the above.
Above-mentioned electromagnetism input structure 15 and touch-control input structure 16 also comprise control circuit separately, and two control circuits may be incorporated in same circuit board, for example are incorporated on the electromagnetism input structure 15, to reduce the thickness of input media 10.
The detecting structure and the method for touch-control input structure 16 in Fig. 5 A and the further illustration of Fig. 5 B Fig. 2 embodiment of the present invention input media 10.In the present embodiment, x0, x1, x2 ... Deng being circuit and represent aforesaid first conducting wire 23, y0, y1, y2 independently separately ... Deng being circuit and represent aforesaid second conducting wire 25 independently separately, in other embodiments, both are also interchangeable.During detecting, second microcontroller 14 can give x0, x1, x2 according to time order and function ... Deng a fixed voltage value, shown in Fig. 5 B.Shown in Fig. 5 A, during the x0 output voltage, x0 is a suspension joint (floating) and x1 and x2 are ground connection (grounded), and y0, y1, y2 ... can be in regular turn detecting whether receive magnitude of voltage, when detecting y0, y0 is a suspension joint and y1 and y2 are ground connection (shown in Fig. 5 A), when detecting y1, y1 is a suspension joint and y0 and y2 are ground connection, and afterwards by that analogy, and y0, y1, y2 are connected to second microcontroller 14; During x1 and x2 output voltage, also finish detecting in the same manner in regular turn.When the user pushes A, B, C 3 points shown in the 5th A figure, then y0 and y1 are because change magnitude of voltage and detect three analog voltage values in regular turn with circuit x0, x1 conducting, these three analog voltage values convert three digital voltage values to via one analogy/digital conversion circuit (not shown), the position that so obtains the point that the user pushes is A, B, C, can make coordinate (x0, y0)=1, (x1, y0)=1, (x1, y1)=1, all the other coordinates are 0, and the coordinate information is spread out of.
According to touch detection principle of the present invention, also can avoid terrible key (ghost input), just can avoid the user not push a coordinate, but judge the situation that this coordinate is pressed by accident, Fig. 6 A and Fig. 6 B explanation the present invention avoid the principle of terrible key.As shown in Figure 6A, when user's press points A, B, C 3 points, may therefore cause a D is terrible key.Because some D, promptly coordinate (x0, y1) its normal guiding path should be path I, and the guiding path of terrible key is path II, the length of path II is greater than the length of path I; Therefore, after being converted to digital voltage, shown in Fig. 4 B, the numerical value of hypothetical reference voltage is 100, and the numerical value of standardization (normalized) rear path I is 70, the numerical value of path II is 50, but so judging point D is terrible key, rather than the user pushes.
Because in the foregoing description, touch detection and guiding path length are closely related, therefore the material of the first conducting circuit 23 and the second conducting circuit 25 can influence the sensitivity of detecting.In a preferred embodiment, the material of the first conducting circuit 23 and the second conducting circuit 25 comprises elargol (ColloidalCarbon) and carbon.
According to touch detection of the present invention, first conducting wire 23 and second conducting wire 25 do not need to be defined as orthogonal, can arrange according to shape, size and the resolution demand of input media 10 (layout), make first conducting wire 23 and second conducting wire, 25 staggered formation a plurality of lattice points (grid), for example the A of Fig. 3 A, B, C are ordered etc., and lattice point provides the firing point of first conducting wire 23 and second conducting wire 25.
Fig. 7 shows that master controller 12 can carry out a program, to obtain coordinate or other information of user's input.Step 40, initialize routines such as setup parameter are carried out in the start back.Step 41 is carried out universe scanning (global scan) 41, supposes that promptly the user uses the input mode of time writer, scans to obtain the general location of time writer through universe.Step 42 judges after universe scans 41 whether receive signal, if having, the expression user uses the time writer input, therefore carry out step 43, carries out a sector scanning (local scan), to follow the trail of the motion track and the coordinates computed of time writer; If do not receive signal through universe scanning 41, the expression user may use the touch-control input, therefore carry out step 44, carries out touch detection 44.In addition, step 45 can judge whether sector scanning receives signal, if having then export (coordinate etc.) data 47 and continue to carry out sector scanning, if do not have, then gets back to universe and scans 41 steps; In like manner, step 46 can judge whether touch detection 44 receives signal, if having, then exports (coordinate etc.) data 47 and continues to carry out touch detection 44 steps, if do not have, then gets back to universe and scans 41 steps.The above universe scanning belongs to the technology of knowing with sector scanning in the technical field of the invention, repeats no more.In addition, said procedure is other orders also, for example, in another embodiment, at first detect the user and make and do not use the touch-control input, when not receiving touching signals, carry out universe again and scan supervisor.
According to input media provided by the invention, the user can freely select with time writer input or can be multiple spot input (multi-touch) with touch control manner input, touch-control, and resolution can improve via the layout density that improves the conducting wire, therefore not only have the advantage of two kinds of input modes concurrently, and improve the usefulness of touch-control input.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art are not in breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (12)
1. input media with multiple input mode is characterized in that it comprises:
One electromagnetism input structure is imported with a time writer for the user;
One touch-control input structure is imported with touch control manner with finger or pen device for the user;
One first microcontroller, the coordinate information that is used to control this electromagnetism input structure and obtains this time writer;
One second microcontroller is used to control this touch-control input structure and obtains the coordinate information that touch-control is imported;
One master controller is used to control this first microcontroller and this second microcontroller; And
One computer is used to handle the coordinate information that this master controller transmits.
2. the input media with multiple input mode according to claim 1, it is characterized in that wherein said input media also comprises a writing surface and is used for writing for the user, and the surface of this electromagnetism input structure is furnished with an XY antenna loop array with equidistant arrangement mode, this XY antenna loop array is used to receive the electromagnetic wave signal that this time writer is launched, each antenna that this first microcontroller switches this XY antenna loop array is with the electromagnetic wave signal responding to this time writer and send and pass this first microcontroller back, this first microcontroller is according to the intensity and the frequency change of electromagnetic wave signal, calculate the coordinate and the force value of this time writer, the button that perhaps user pressed why.
3. the input media with multiple input mode according to claim 1, it is characterized in that wherein said touch-control input structure comprises one first substrate and one second substrate, this first substrate and this second substrate are insulation material film, the surface arrangement of this first substrate has one first conducting wire, the surface arrangement of this second substrate has one second conducting wire, wherein this first conducting wire and this second conducting wire face one another, and are separated by a plurality of separating balls.
4. the input media with multiple input mode according to claim 3 is characterized in that wherein the material of this first substrate and this second substrate comprises polyethylene terephthalate.
5. the input media with multiple input mode according to claim 3 is characterized in that wherein the material of this first conducting circuit and this second conducting circuit comprises elargol and carbon.
6. the input media with multiple input mode according to claim 3, it is characterized in that wherein said first conducting wire comprises x0, x1, x2 ... circuit independently separately, this second conducting wire comprises y0, y1, y2 ... circuit independently separately, this first conducting wire and this second conducting wire intersect at a plurality of lattice points, this second microcontroller gives this first conducting wire a fixed voltage value in regular turn, detect simultaneously the magnitude of voltage of this second conducting wire in regular turn, when the user presses this writing surface in one or more lattice point with finger or pen device, can detect one or more analog voltage value, change and be standardized into one or more digital voltage value via one analogy/digital conversion circuit, utilize the longer voltage that is detected of the guiding path little principle that heals, can calculate the coordinate of these one or more lattice points that the user pushes.
7. the input media with multiple input mode according to claim 1 it is characterized in that wherein this electromagnetism input structure and this touch-control input structure also comprise control circuit separately, and two control circuits is incorporated in same circuit board.
8. the input media with multiple input mode according to claim 1, it is characterized in that wherein said this touch-control input structure comprises a plurality of infrared transmitter and infrared ray receiver, user's one or more contact point makes corresponding infrared ray receiver can not receive signal, so can know the coordinate of this contact point.
9. the input media with multiple input mode according to claim 1, it is characterized in that wherein said touch-control input structure comprises a plurality of infrared transmitter and a plurality of image sensor, user's one or more contact point changes the reception image of this image sensor, can know the coordinate of this contact point in view of the above.
10. the input media with multiple input mode according to claim 1 is characterized in that wherein said computer expert crosses the track that a projector shows user's input.
11. the input media with multiple input mode according to claim 1 is characterized in that wherein the transmission between this master controller and this computer is to transmit in wired or wireless mode.
12. the input media with multiple input mode according to claim 1 is characterized in that wherein said master controller carries out a program to control this first microcontroller and this second microcontroller, this program comprises the following step:
Initialization;
Carry out universe scanning, be used to obtain the position of time writer;
Judge whether this universe scanning receives signal, if receive signal, carries out a sector scanning, with motion track and the coordinates computed of following the trail of this time writer, if do not receive signal, carries out a touch detection;
Judge whether this sector scanning receives signal,,, then get back to this universe scanning if do not receive signal if receive signal then output coordinate data and continue to carry out this sector scanning; And
Judge whether this touch detection receives signal, if receive signal, then output coordinate data and continue to carry out this touch detection if do not receive signal, are then got back to this universe scanning.
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| CN 201010117095 CN101963856A (en) | 2009-07-24 | 2010-03-02 | Input device with multiple input modes |
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| CN 201010117095 CN101963856A (en) | 2009-07-24 | 2010-03-02 | Input device with multiple input modes |
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| CN103870089B (en) * | 2012-12-10 | 2017-08-01 | 航天信息股份有限公司 | One kind input shows system and method |
| CN108279816A (en) * | 2013-11-08 | 2018-07-13 | 禾瑞亚科技股份有限公司 | Sender unit and its method of signalling |
| CN108279816B (en) * | 2013-11-08 | 2020-04-10 | 禾瑞亚科技股份有限公司 | Transmitter and transmitting method thereof |
| CN108322224A (en) * | 2017-01-17 | 2018-07-24 | 群光电子股份有限公司 | Detection circuit |
| CN108322224B (en) * | 2017-01-17 | 2021-08-31 | 群光电子股份有限公司 | Detection circuit |
| CN109766029A (en) * | 2019-03-27 | 2019-05-17 | 乐写科技深圳有限公司 | A kind of double-sided screen handwriting board device |
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Application publication date: 20110202 |