CN111651074B - Electromagnetic input device and electromagnetic input method - Google Patents
Electromagnetic input device and electromagnetic input method Download PDFInfo
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- CN111651074B CN111651074B CN202010642875.7A CN202010642875A CN111651074B CN 111651074 B CN111651074 B CN 111651074B CN 202010642875 A CN202010642875 A CN 202010642875A CN 111651074 B CN111651074 B CN 111651074B
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- 230000005540 biological transmission Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 description 4
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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- Position Input By Displaying (AREA)
Abstract
The invention provides an electromagnetic input device and an electromagnetic input method. The electromagnetic input device includes: an input board and an electromagnetic pen for performing input operation on the input board; the input board includes: an antenna board, a first multiplexer, a second multiplexer and a processing unit; setting N and M as positive integers greater than 1 and N being smaller than M, wherein the antenna board comprises M antennas which are sequentially arranged, the first multiplexer comprises M first signal ends which are respectively and electrically connected with the M antennas, the second multiplexer comprises N second signal ends, N antennas in the M antennas are respectively and correspondingly and electrically connected with the N second signal ends, and at least one antenna is arranged between two antennas which are electrically connected with two adjacent second signal ends; the processing unit is electrically connected with the first multiplexer and the second multiplexer, and the electromagnetic pen pre-searching efficiency can be improved and the input fluency of the electromagnetic input device can be improved by adding the second multiplexer and utilizing the second multiplexer to perform the electromagnetic pen pre-searching.
Description
Technical Field
The present invention relates to the field of electromagnetic input, and in particular, to an electromagnetic input device and an electromagnetic input method.
Background
The electromagnetic input technology has the characteristics of high precision, pressure feeling during handwriting, no influence on the display effect of a display screen and the like, and is widely applied to various electronic products such as handwriting computers, electronic books, handwriting liquid crystal screens and the like.
An existing electromagnetic input device includes: an input panel, and an electromagnetic pen for performing an input operation on the input panel; the input panel includes: the antenna board, the multiplexer that is connected with the antenna board electricity, with the signal amplifier that is connected with the multiplexer electricity, with the analog-to-digital converter that is connected with the signal amplifier electricity, with the treater that is connected with the analog-to-digital converter and multiplexer electricity;
Specifically, the working process of the electromagnetic input device is that the processor gates a corresponding signal transmission channel in the multiplexer, the multiplexer provides power supply voltage for the antenna board through the signal transmission channel, the antenna board utilizes the power supply voltage to emit charging electromagnetic waves to the electromagnetic pen, the electromagnetic pen emits positioning electromagnetic waves to the antenna board according to the charging electromagnetic waves or directly emits positioning electromagnetic waves to the antenna board by utilizing a self-contained power supply, the positioning electromagnetic waves are transmitted to the signal amplifier through the multiplexer to amplify signals, the amplified positioning electromagnetic waves are transmitted to the analog-to-digital converter to be subjected to analog-to-digital conversion, a position identification signal in a digital signal format is generated, and the position identification signal is transmitted to the processor, and the processor identifies the position of the electromagnetic pen relative to the antenna board through the position identification signal to complete electromagnetic input.
In the prior art, when an electromagnetic pen does not enter a working area of an input board, in order to search whether the electromagnetic pen enters the working area and at which position of the working area the electromagnetic pen is located when entering, the electromagnetic pen needs to be pre-searched, and the general pre-search is to start searching and scanning one by one from a first antenna to a last antenna, namely searching and scanning one by one according to the sequence from the first antenna, a second antenna and a third antenna to the last antenna, at this time, if the electromagnetic pen enters the working area and is far away from the first antenna, the time required for searching the electromagnetic pen is long, a user can feel hysteresis and blocking when moving the electromagnetic pen into the working area and inputting the first pen, so that the user experience is poor, even when the user rapidly drops the pen, the electromagnetic pen cannot be input on the input board because the electromagnetic pen is not searched, and the electromagnetic input device is further disabled.
Disclosure of Invention
The invention aims to provide an electromagnetic input device, which can improve the pre-search efficiency of an electromagnetic pen and improve the input fluency of the electromagnetic input device.
The invention also aims to provide an electromagnetic input method which can improve the pre-search efficiency of the electromagnetic pen and improve the input fluency of the electromagnetic input device.
To achieve the above object, the present invention provides an electromagnetic input device including: an input board and an electromagnetic pen for performing input operation on the input board;
The input pad includes: an antenna board, a first multiplexer, a second multiplexer and a processing unit;
Setting N and M as positive integers greater than 1 and N smaller than M, wherein the antenna board comprises M antennas which are sequentially arranged, the first multiplexer comprises M first signal ends which are sequentially arranged, and the second multiplexer comprises N second signal ends which are sequentially arranged;
Each antenna is electrically connected with one first signal end, N antennas in the M antennas are respectively and correspondingly electrically connected with N second signal ends, and at least one antenna is arranged between two antennas which are electrically connected with two adjacent second signal ends;
the processing unit is electrically connected with the first multiplexer and the second multiplexer;
The processing unit is used for judging the working state of the electromagnetic input device, controlling the first multiplexer to be closed and the second multiplexer to work when the working state of the electromagnetic input device is a pre-search electromagnetic pen, and simultaneously controlling the second multiplexer to start the N second signal ends one by one according to a preset search sequence so as to scan N antennas electrically connected with the N second signal ends; when the working state of the electromagnetic input device is that the electromagnetic pen normally inputs, the first multiplexer is controlled to work, the second multiplexer is controlled to be closed, and meanwhile, the first multiplexer is controlled to be opened one by one the M first signal ends according to a preset scanning sequence so as to scan M antennas electrically connected with the M first signal ends.
The first multiplexer further comprises a first enabling end, a first gating end and a first transmission end; the second multiplexer further comprises a second enabling end, a second gating end and a second transmission end;
the processing unit is electrically connected with the first enabling end, the first gating end and the first transmission end, the second gating end and the second transmission end are respectively electrically connected with the first gating end and the first transmission end, and the second enabling end is electrically connected with the first enabling end through an inverter;
The processing unit is used for providing an enabling signal to the first enabling end and providing a gating signal to the first gating end.
The processing unit includes: a signal amplifier, an analog-to-digital converter and a processor;
The signal amplifier is electrically connected with the first transmission end, the analog-to-digital converter is electrically connected with the signal amplifier, and the processor is electrically connected with the analog-to-digital converter;
The first enabling end and the first gating end are respectively and electrically connected with the processor.
The 1 st second signal end is electrically connected with the 1 st antenna, the N th second signal end is electrically connected with the M th antenna, the i th second signal end is electrically connected with the (i-1) j th antenna, i is a positive integer greater than 1 and less than N, and j is a positive integer greater than 1.
j≤5。
j=5。
The preset searching sequence is that the X second signal end is started first, and then each second signal end on two sides of the X second signal end is started alternately;
Each second signal end on one side of the X second signal end is sequentially opened according to the sequence from the X second signal end to the 1 st second signal end, and each second signal end on the other side of the X second signal end is sequentially opened according to the sequence from the X second signal end to the N second signal end; when N is even, x=n/2, and when N is odd, x= (n+1)/2.
When the electromagnetic pen is an active electromagnetic pen, the signal amplifier includes: the circuit comprises an operational amplifier, a first resistor, a second resistor and a first switch;
one end of the first resistor is electrically connected with the first transmission end, and the other end of the first resistor is electrically connected with the non-inverting input end of the operational amplifier;
One end of the second resistor is electrically connected with the normal phase input end of the operational amplifier, and the other end of the second resistor is electrically connected with the output end of the operational amplifier;
The control end of the first switch is connected with a first control signal, and the two connecting ends are respectively connected with the two ends of the second resistor;
the inverting input end of the operational amplifier is grounded, and the output end of the operational amplifier is electrically connected with the analog-to-digital converter.
When the electromagnetic pen is a passive electromagnetic pen, the electromagnetic input device further comprises a charging module, the first multiplexer further comprises a first charging end, and the second multiplexer further comprises a second charging end electrically connected with the first charging end;
The charging module includes: the boost circuit, the first diode, the second diode and the second switch;
the boost circuit is provided with an input end, an output end, a power end and a grounding end, wherein the input end is connected with an initial charging clock signal, the output end outputs a target charging clock signal to a first charging end, the power end is electrically connected with the cathode of a first diode, and the grounding end is grounded;
the anode of the first diode is connected with a first power supply voltage;
the anode of the second diode is electrically connected with one end of the second switch, and the cathode of the second diode is electrically connected with the cathode of the first diode;
The control end of the second switch is connected with a second control signal, the other end of the second switch is connected with a second power supply voltage, and the second power supply voltage is larger than the first power supply voltage.
The invention also provides an electromagnetic input method which is applied to the electromagnetic input device and comprises the following steps:
the processing unit judges the working state of the electromagnetic input device;
When the working state of the electromagnetic input device is that the electromagnetic pen is pre-searched, the processing unit controls the first multiplexer to be closed, the second multiplexer to work, and controls the second multiplexer to open the N second signal ends one by one according to a preset searching sequence so as to scan N antennas electrically connected with the N second signal ends;
When the working state of the electromagnetic input device is that the electromagnetic pen normally inputs, the processing unit controls the first multiplexer to work, the second multiplexer to be closed, and controls the first multiplexer to start the M first signal ends one by one according to a preset scanning sequence so as to scan M antennas electrically connected with the M first signal ends.
The invention has the beneficial effects that: the present invention provides an electromagnetic input device, comprising: an input board and an electromagnetic pen for performing input operation on the input board; the input pad includes: an antenna board, a first multiplexer, a second multiplexer and a processing unit; setting N and M as positive integers greater than 1 and N smaller than M, wherein the antenna board comprises M antennas which are sequentially arranged, the first multiplexer comprises M first signal ends which are sequentially arranged, and the second multiplexer comprises N second signal ends which are sequentially arranged; each antenna is electrically connected with one first signal end, N antennas in the M antennas are respectively and correspondingly electrically connected with N second signal ends, and at least one antenna is arranged between two antennas which are electrically connected with two adjacent second signal ends; the processing unit is electrically connected with the first multiplexer and the second multiplexer, and the electromagnetic pen pre-searching efficiency can be improved and the input fluency of the electromagnetic input device can be improved by adding the second multiplexer and utilizing the second multiplexer to perform the electromagnetic pen pre-searching. The invention further provides an electromagnetic input method, which can improve the pre-search efficiency of the electromagnetic pen and improve the input fluency of the electromagnetic input device.
Drawings
For a further understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention and to the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention. In the drawings of which there are shown,
FIG. 1 is a schematic diagram of an electromagnetic input device of the present invention;
Fig. 2 is a structural view of an antenna board of the electromagnetic input device of the present invention;
FIG. 3 is a circuit diagram of a signal amplifier in a first embodiment of an electromagnetic input device of the present invention;
Fig. 4 is a circuit diagram of a charging module in a second embodiment of the electromagnetic input device of the present invention;
Fig. 5 is a flow chart of the electromagnetic input method of the present invention.
Detailed Description
In order to further explain the technical means adopted by the present invention and the effects thereof, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1 to 4, the present invention provides an electromagnetic input device, comprising: an input board 10 and an electromagnetic pen 20 for performing an input operation on the input board 10;
The input pad 10 includes: an antenna board 11, a first multiplexer 12, a second multiplexer 13, and a processing unit 14;
let N and M be positive integers greater than 1, where N is less than M, the antenna board 11 includes M antennas 111 sequentially arranged, the first multiplexer 12 includes M first signal terminals 121 sequentially arranged, and the second multiplexer 13 includes N second signal terminals 131 sequentially arranged;
Each antenna 111 is electrically connected to one first signal end 121, N antennas 111 in the M antennas 111 are respectively and correspondingly electrically connected to N second signal ends 131, and at least one antenna 111 is spaced between two antennas 111 electrically connected to two adjacent second signal ends 131;
the processing unit 14 is electrically connected to the first multiplexer 12 and the second multiplexer 13;
The processing unit 14 is configured to determine an operation state of the electromagnetic input device, and when the operation state of the electromagnetic input device is a pre-search electromagnetic pen 20, control the first multiplexer 12 to be turned off, control the second multiplexer 13 to operate, and control the second multiplexer 13 to turn on the N second signal terminals 131 one by one according to a preset search sequence, where the N antennas 111 electrically connected to the N second signal terminals 131 perform scanning; when the working state of the electromagnetic input device is that the electromagnetic pen 20 is normally input, the first multiplexer 12 is controlled to work, the second multiplexer 13 is controlled to be closed, and the first multiplexer 12 is controlled to open the M first signal ends 121 one by one according to a preset scanning sequence, so as to scan the M antennas 111 electrically connected with the M first signal ends 121.
Specifically, the first multiplexer 12 further includes a first enable terminal 122, a first gate terminal 123, and a first transmission terminal 124; the second multiplexer 13 further includes a second enable end 132, a second gate end 133, and a second transmission end 134;
The processing unit 14 is electrically connected to the first enable terminal 122, the first gate terminal 123, and the first transmission terminal 124, the second gate terminal 133 and the second transmission terminal 134 are electrically connected to the first gate terminal 123 and the first transmission terminal 124, respectively, and the second enable terminal 132 is electrically connected to the first enable terminal 122 via an inverter F1;
the processing unit 14 is configured to provide an enable signal EN to the first enable terminal 122 and a gate signal SEL to the first gate terminal 123.
It should be noted that, the first and second strobe terminals 123 and 133 each include a plurality of connection terminals, each of which is electrically connected to the processing unit 14 to obtain strobe data from the processing unit 14, the strobe data received by each connection terminal is combined to obtain strobe signals SEL, different strobe signals SEL are generated by changing the strobe data received by each connection terminal to connect the first transmission terminal 124 to different first signal terminals 121 (i.e. turn on different first signal terminals 121) or connect the second transmission terminal 134 to different second signal terminals 131 (i.e. turn on different second signal terminals 131), for example, each of the first and second strobe terminals 123 and 133 includes 5 connection terminals, each of which can receive "0" data or "1" data, and the "0" data or "1" data received by the 5 connection terminals is combined to obtain different strobe signals SEL.
The enable signal EN is used to control the first multiplexer 12 and the second multiplexer 13 to operate and close, when the enable signal EN is at a high level, the first multiplexer 12 operates, and when the enable signal EN is at a low level, the second multiplexer 13 operates, and the first multiplexer 12 is closed.
The gate signal SEL acts on the first gate terminal 123 when the first multiplexer 12 is operated, and acts on the second gate terminal 133 when the second multiplexer 13 is operated.
Specifically, the processing unit 14 includes: a signal amplifier 141, an analog-to-digital converter 142, and a processor 143;
the signal amplifier 141 is electrically connected to the first transmission end 124, the analog-to-digital converter 142 is electrically connected to the signal amplifier 141, and the processor 143 is electrically connected to the analog-to-digital converter 142;
the first enable terminal 122 and the first gate terminal 123 are electrically connected to the processor 143, respectively.
The signal amplifier 141 takes a signal from the first transmission end 124 when the first multiplexer 12 is operated, and the signal amplifier 141 takes a signal from the second transmission end 134 when the second multiplexer 13 is operated.
Specifically, the 1 st second signal end 131 is electrically connected to the 1 st antenna 111, the nth second signal end 131 is electrically connected to the mth antenna 111, the ith second signal end 131 is electrically connected to the (i-1) th antenna 111, i is a positive integer greater than 1 and less than N, and j is a positive integer greater than 1.
Specifically, the preset search sequence is to start the xth second signal end 131 first, and then start each second signal end 131 on both sides of the xth second signal end 131 alternately;
wherein, each second signal end 131 on one side of the xth second signal end 131 is sequentially opened in the order from the xth second signal end 131 to the 1 st second signal end 131, and each second signal end 131 on the other side of the xth second signal end 131 is sequentially opened in the order from the xth second signal end 131 to the nth second signal end 131; when N is even, x=n/2, and when N is odd, x= (n+1)/2.
Preferably, j.ltoreq.5, more preferably, j=5.
Further, the X second signal end 131 is electrically connected to the antenna 111 at the center of the M antennas 111.
Taking j=5, the X-th second signal end 131 corresponds to one antenna 111 in the center of the M antennas 111 as an example, and defines one antenna 111 in the center as the Y-th antenna 111, the predetermined search sequence is as follows: the X second signal end 131 is turned on first, the Y antenna 111 is scanned, then the X-1 second signal end is turned on, the Y-5 antenna 111 is scanned, then the X+1 second signal end is turned on, the Y+5 antenna 111 is scanned, then the X-2 second signal end is turned on, the Y-10 antenna 111 is scanned, then the X+2 second signal end is turned on, the Y+10 antenna 111 is scanned, and so on until the 1 st second signal end is turned on, the 1 st antenna 111 is scanned, the N second signal end is turned on, and the M antenna 111 is scanned.
Therefore, as can be seen from the above embodiment, the present invention changes the search scanning mode of adding 1 one by one from the first antenna in the prior art into the search scanning mode of 5 intervals (i.e. subtracting 5and adding 5 one by one) from the central antenna to both sides, compared with the prior art, the scanning is started from the central antenna, so that the maximum distance between the position of the electromagnetic pen and the position where the scanning starts can be reduced to half of the maximum distance from the first antenna, and the search scanning is performed by spacing 5 antennas, compared with the adding 1 mode, the scanning speed can be effectively accelerated, the pre-search efficiency of the electromagnetic pen is improved, and the working smoothness of the electromagnetic input device is ensured.
Further, it is known to those skilled in the art that the existing electromagnetic input device can scan to obtain 5 antenna energy values for locating the position of the electromagnetic pen, whether an active electromagnetic pen or a passive electromagnetic pen is adopted, so that the electromagnetic pen can be successfully searched by adopting the mode that the hardware of the existing specification parameters is sufficient to realize the 5-interval (i.e. j=5) antenna scanning of the invention, that is, the mode that the 5-interval is pre-searched under the hardware condition of the existing specification parameters, and of course, the number of the interval can be smaller than 5, which is easier to realize than the 5-interval mode, but the efficiency is reduced.
Further, to facilitate implementation of the 5 antenna scan approach of the present invention, the present invention is directed to enhancements made separately to passive and active electromagnetic pens.
Specifically, when the electromagnetic pen 20 is an active electromagnetic pen, the signal amplifier 141 includes: an operational amplifier OP1, a first resistor R1, a second resistor R2, and a first switch Q1;
one end of the first resistor R1 is electrically connected to the first transmission end 124, and the other end is electrically connected to the non-inverting input end of the operational amplifier OP 1;
One end of the second resistor R2 is electrically connected with the non-inverting input end of the operational amplifier OP1, and the other end of the second resistor R2 is electrically connected with the output end of the operational amplifier OP 1;
The control end of the first switch Q1 is connected with a first control signal Ctr1, and the two connecting ends are respectively connected with the two ends of the second resistor R2;
The inverting input terminal of the operational amplifier OP1 is grounded, and the output terminal is electrically connected to the analog-to-digital converter 142.
It should be noted that, when the electromagnetic pen 20 is an active electromagnetic pen, the first control signal Ctr1 controls the operational amplifier OP1 to have a magnification factor of (r1+r2)/R1 when the working state of the electromagnetic input device is the pre-search electromagnetic pen 20, and the first control signal Ctr1 controls the operational amplifier OP1 to have a magnification factor of 1 when the working state of the electromagnetic input device is the normal input of the electromagnetic pen 20, so that the magnification factor of the signal amplifier 131 is increased when the electromagnetic pen 20 is pre-searched, and the signal obtained by the pre-search is more easily recognized.
Specifically, when the electromagnetic pen 20 is a passive electromagnetic pen, the electromagnetic input device further includes a charging module 15, the first multiplexer 12 further includes a first charging end 125, and the second multiplexer 13 further includes a second charging end 135 electrically connected to the first charging end 125;
the charging module 15 includes: a boost circuit 151, a first diode D1, a second diode D2, and a second switch Q2;
The boost circuit 151 has an input end, an output end, a power supply end and a ground end, the input end is connected to the initial charging clock signal CK1, the output end outputs the target charging clock signal CK2 to the first charging end 125, the power supply end is electrically connected to the cathode of the first diode D1, and the ground end is grounded;
The anode of the first diode D1 is connected with a first power supply voltage V1;
The anode of the second diode D2 is electrically connected with one end of the second switch Q2, and the cathode of the second diode D2 is electrically connected with the cathode of the first diode D1;
the control end of the second switch Q2 is connected to a second control signal Ctr2, the other end of the second switch Q2 is connected to a second power supply voltage V2, and the second power supply voltage V2 is larger than the first power supply voltage V1.
It should be noted that, when the electromagnetic pen 20 is an active electromagnetic pen, the second control signal Ctr2 controls the charging module 15 to be connected to the second power voltage V2 when the working state of the electromagnetic input device is the pre-search electromagnetic pen 20, and the second control signal Ctr2 controls the charging module 15 to be connected to the first power voltage V1 when the working state of the electromagnetic input device is the normal input of the electromagnetic pen 20, so that when the pre-search electromagnetic pen 20 is performed, the voltage of the target charging clock signal CK2 is higher than that when the pre-search electromagnetic pen 20 is performed normally, so that the charging voltage is received by the electromagnetic pen 20 to be greater, and the signal is obtained more easily during the pre-search.
Preferably, the second power voltage V2 is 9V, and the first power voltage V1 is 5V.
Preferably, the first switch Q1 and the second switch Q2 are thin film transistor switches, and the first control signal Ctr1 and the second control signal Ctr2 may be provided by the processor 143.
It should be noted that, although the present invention only illustrates an embodiment of pre-searching a group of antennas 111 arranged in sequence, those skilled in the art will recognize that the structure of crisscross arranging two groups of antennas in an antenna board is a common structure in the art, and the pre-searching method of the present invention is suitable for pre-searching a group of antennas arranged longitudinally and for pre-searching a group of antennas arranged transversely, which does not affect the implementation of the present invention.
Referring to fig. 5, the present invention provides an electromagnetic input method applied to the electromagnetic input device, including the following steps:
the processing unit 14 determines the current working state of the electromagnetic input device;
when the working state of the electromagnetic input device is that the electromagnetic pen 20 is pre-searched, the processing unit 14 controls the first multiplexer 12 to be turned off, controls the second multiplexer 13 to work, and controls the second multiplexer 13 to turn on the N second signal terminals 131 one by one according to a preset search sequence so as to scan the N antennas 111 electrically connected to the N second signal terminals 131;
When the working state of the electromagnetic input device is that the electromagnetic pen 20 normally inputs, the processing unit 14 controls the first multiplexer 12 to work, the second multiplexer 13 to close, and controls the first multiplexer 12 to open the M first signal terminals 121 one by one according to a preset scanning sequence, so as to scan the M antennas 111 electrically connected to the M first signal terminals 121.
In summary, the present invention provides an electromagnetic input device, including: an input board and an electromagnetic pen for performing input operation on the input board; the input pad includes: an antenna board, a first multiplexer, a second multiplexer and a processing unit; setting N and M as positive integers greater than 1 and N smaller than M, wherein the antenna board comprises M antennas which are sequentially arranged, the first multiplexer comprises M first signal ends which are sequentially arranged, and the second multiplexer comprises N second signal ends which are sequentially arranged; each antenna is electrically connected with one first signal end, N antennas in the M antennas are respectively and correspondingly electrically connected with N second signal ends, and at least one antenna is arranged between two antennas which are electrically connected with two adjacent second signal ends; the processing unit is electrically connected with the first multiplexer and the second multiplexer, and the electromagnetic pen pre-searching efficiency can be improved and the input fluency of the electromagnetic input device can be improved by adding the second multiplexer and utilizing the second multiplexer to perform the electromagnetic pen pre-searching.
In the above, it should be apparent to those skilled in the art that various other modifications and variations can be made in accordance with the technical solution and the technical idea of the present invention, and all such modifications and variations are intended to fall within the scope of the claims of the present invention.
Claims (10)
1. An electromagnetic input device, comprising: an input board (10) and an electromagnetic pen (20) for performing an input operation on the input board (10);
the input pad (10) comprises: an antenna board (11), a first multiplexer (12), a second multiplexer (13) and a processing unit (14);
let N and M be positive integers greater than 1, and N is less than M, the antenna board (11) includes M antennas (111) that arrange in order, the first multiplexer (12) includes M first signal ends (121) that arrange in order, the second multiplexer (13) includes N second signal ends (131) that arrange in order;
Each antenna (111) is electrically connected with one first signal end (121), N antennas (111) in the M antennas (111) are respectively and correspondingly electrically connected with N second signal ends (131), and at least one antenna (111) is arranged between two antennas (111) which are electrically connected with two adjacent second signal ends (131);
The processing unit (14) is electrically connected with the first multiplexer (12) and the second multiplexer (13);
The processing unit (14) is configured to determine an operating state of the electromagnetic input device, and when the operating state of the electromagnetic input device is a pre-search electromagnetic pen (20), control the first multiplexer (12) to be turned off, and control the second multiplexer (13) to operate, and simultaneously control the second multiplexer (13) to turn on the N second signal ends (131) one by one according to a preset search sequence, so as to scan N antennas (111) electrically connected to the N second signal ends (131); when the working state of the electromagnetic input device is that the electromagnetic pen (20) inputs normally, the first multiplexer (12) is controlled to work, the second multiplexer (13) is closed, and meanwhile, the first multiplexer (12) is controlled to start the M first signal ends (121) one by one according to a preset scanning sequence so as to scan the M antennas (111) electrically connected with the M first signal ends (121).
2. The electromagnetic input device of claim 1, wherein the first multiplexer (12) further comprises a first enable terminal (122), a first gate terminal (123), and a first transmission terminal (124); the second multiplexer (13) further comprises a second enabling end (132), a second gating end (133) and a second transmitting end (134);
The processing unit (14) is electrically connected to the first enabling end (122), the first gating end (123) and the first transmission end (124), the second gating end (133) and the second transmission end (134) are respectively electrically connected to the first gating end (123) and the first transmission end (124), and the second enabling end (132) is electrically connected to the first enabling end (122) through an inverter (F1);
the processing unit (14) is configured to provide an enable signal (EN) to the first enable terminal (122) and a strobe Signal (SEL) to the first strobe terminal (123).
3. The electromagnetic input device as claimed in claim 2, wherein the processing unit (14) comprises: a signal amplifier (141), an analog-to-digital converter (142), and a processor (143);
The signal amplifier (141) is electrically connected to the first transmission end (124), the analog-to-digital converter (142) is electrically connected to the signal amplifier (141), and the processor (143) is electrically connected to the analog-to-digital converter (142);
The first enable terminal (122) and the first gate terminal (123) are electrically connected to the processor (143), respectively.
4. The electromagnetic input device as recited in claim 1, wherein the 1 st second signal terminal (131) is electrically connected to the 1 st antenna (111), the nth second signal terminal (131) is electrically connected to the mth antenna (111), the ith second signal terminal (131) is electrically connected to the (i-1) th antenna (111), i is a positive integer greater than 1 and less than N, and j is a positive integer greater than 1.
5. The electromagnetic input device as in claim 4 wherein j is less than or equal to 5.
6. The electromagnetic input device as in claim 5, wherein j = 5.
7. The electromagnetic input device according to claim 1, wherein the predetermined search sequence is to start the X-th second signal terminal (131) first, and then start each second signal terminal (131) on both sides of the X-th second signal terminal (131) alternately;
Wherein, each second signal end (131) on one side of the X second signal end (131) is sequentially opened in the sequence from the X second signal end (131) to the 1 st second signal end (131), and each second signal end (131) on the other side of the X second signal end (131) is sequentially opened in the sequence from the X second signal end (131) to the N second signal end (131); when N is even, x=n/2, and when N is odd, x= (n+1)/2.
8. An electromagnetic input device as claimed in claim 3, characterized in that, when the electromagnetic pen (20) is an active electromagnetic pen, the signal amplifier (141) comprises: an operational amplifier (OP 1), a first resistor (R1), a second resistor (R2) and a first switch (Q1);
one end of the first resistor (R1) is electrically connected with the first transmission end (124), and the other end of the first resistor is electrically connected with the non-inverting input end of the operational amplifier (OP 1);
One end of the second resistor (R2) is electrically connected with the non-inverting input end of the operational amplifier (OP 1), and the other end of the second resistor is electrically connected with the output end of the operational amplifier (OP 1);
The control end of the first switch (Q1) is connected with a first control signal (Ctr 1), and the two connecting ends are respectively and electrically connected with the two ends of the second resistor (R2);
The inverting input end of the operational amplifier (OP 1) is grounded, and the output end of the operational amplifier is electrically connected with the analog-to-digital converter (142).
9. The electromagnetic input device of claim 3, wherein when the electromagnetic pen (20) is a passive electromagnetic pen, the electromagnetic input device further comprises a charging module (15), the first multiplexer (12) further comprises a first charging terminal (125), and the second multiplexer (13) further comprises a second charging terminal (135) electrically connected to the first charging terminal (125);
The charging module (15) comprises: a booster circuit (151), a first diode (D1), a second diode (D2), and a second switch (Q2);
The boost circuit (151) is provided with an input end, an output end, a power end and a grounding end, wherein the input end is connected with an initial charging clock signal (CK 1), the output end outputs a target charging clock signal (CK 2) to the first charging end (125), the power end is electrically connected with the cathode of the first diode (D1), and the grounding end is grounded;
the anode of the first diode (D1) is connected with a first power supply voltage (V1);
The anode of the second diode (D2) is electrically connected with one end of the second switch (Q2), and the cathode of the second diode (D1) is electrically connected with the cathode of the first diode;
the control end of the second switch (Q2) is connected with a second control signal (Ctr 2), the other end of the second switch is connected with a second power supply voltage (V2), and the second power supply voltage (V2) is larger than the first power supply voltage (V1).
10. An electromagnetic input method, characterized by being applied to an electromagnetic input device as claimed in any one of claims 1 to 9, comprising the steps of:
The processing unit (14) judges the working state of the electromagnetic input device;
when the working state of the electromagnetic input device is that the electromagnetic pen (20) is pre-searched, the processing unit (14) controls the first multiplexer (12) to be closed, the second multiplexer (13) to work, and controls the second multiplexer (13) to start the N second signal ends (131) one by one according to a preset searching sequence so as to scan N antennas (111) electrically connected with the N second signal ends (131);
When the working state of the electromagnetic input device is that the electromagnetic pen (20) inputs normally, the processing unit (14) controls the first multiplexer (12) to work, the second multiplexer (13) is closed, and the first multiplexer (12) is controlled to open the M first signal ends (121) one by one according to a preset scanning sequence so as to scan the M antennas (111) electrically connected with the M first signal ends (121).
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