CN107632735A - A kind of handwriting device, liquid crystal handwriting board device and method for deleting - Google Patents
A kind of handwriting device, liquid crystal handwriting board device and method for deleting Download PDFInfo
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- CN107632735A CN107632735A CN201710867590.1A CN201710867590A CN107632735A CN 107632735 A CN107632735 A CN 107632735A CN 201710867590 A CN201710867590 A CN 201710867590A CN 107632735 A CN107632735 A CN 107632735A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 217
- 230000005611 electricity Effects 0.000 claims abstract description 71
- 239000012528 membrane Substances 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 13
- 239000010408 film Substances 0.000 description 5
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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Abstract
The invention discloses a kind of handwriting device, liquid crystal handwriting board device and method for deleting.The handwriting device includes power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil；First control terminal of the power transmission circuit electrically connects with the switch, transmits the voltage of the output end of the power supply to the power input of the power transmission drive circuit for the control according to the switch；The output end of the power transmission drive circuit electrically connects with the power transmission coil, for after the power-up, to the power transmission electrical coil output signal；The power transmission coil is used for when being applied in corresponding electric signal, is acted on neighbouring electricity reception coil, the electricity reception coil is produced alternating current.So, power supply, switch etc. are arranged in handwriting device, the handwriting device can reach the purpose for removing liquid crystal handwriting board device display content by way of wireless power transmission to liquid crystal handwriting board device power transmission；Further, liquid crystal handwriting board device is salable, meets waterproof requirement, and application places are more extensive.
Description
Technical field
The present embodiments relate to handwriting pad field, more particularly to a kind of handwriting device, liquid crystal handwriting board device and erasing
Method.
Background technology
The erasing principle of liquid crystal handwriting board device is to produce an electric field at the both ends of liquid crystal, is made by external force effect and nothing
The liquid crystal of sequence arrangement recovers original ordered arrangement again, so as to reach the purpose for removing content on liquid crystal handwriting board device.
Generally, battery, electric power management circuit and erasing switch are provided with liquid crystal handwriting board device.Erasing switch by by
After lower, output voltage is to the membrane electrode of liquid crystal handwriting board device, film after electric power management circuit is handled cell voltage
Electric field is produced between electrode, the content for making to show on liquid crystal handwriting board device is wiped.Erasing switch is arranged on handwriting pad, is used
Person may be pressed to switch unintentionally in writing process, cause written contents to be wiped by mistake.Simultaneously as being erased out
The influence of the factors such as pass, battery, battery tray, battery cover, liquid crystal handwriting board device is extremely difficult to accomplish the requirement such as dustproof and waterproof, and product is set
There is larger limitation the application place of meter.
The content of the invention
The present invention provides a kind of handwriting device, liquid crystal handwriting board device and method for deleting, can improve the spirit of liquid crystal handwriting pad
Activity, meanwhile, the sealing of liquid crystal handwriting board device can be achieved, make liquid crystal handwriting board device can be with dustproof and waterproof, application places are more
Extensively.
Power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil are arranged at hand-written by proposition of the embodiment of the present invention
In device, it is arranged on by electricity reception coil and by electric drive circuit in liquid crystal handwriting board device, by wireless power delivery mode, hand-written dress
Put to liquid crystal handwriting board device power transmission, realize the purpose for removing liquid crystal handwriting board device display content；This scheme is by using wiping
Except the mode that switch separates with handwriting pad, the mistake of written contents on handwriting pad can be avoided to wipe, improve the flexibility of handwriting pad；Together
When, the sealing of liquid crystal handwriting board device, accomplish the requirement of dustproof and waterproof, the field of employment of product design is more.
In a first aspect, the embodiments of the invention provide a kind of handwriting device, the handwriting device includes：Power supply, switch, power transmission
Circuit, power transmission drive circuit and power transmission coil；
The input of the power transmission circuit electrically connects with the output end of the power supply, and the output end of the power transmission circuit is with sending
The power input electrical connection of electric drive circuit, the first control terminal of the power transmission circuit electrically connects with the switch, for root
The voltage of the output end of the power supply is transmitted to the power input of the power transmission drive circuit according to the control of the switch；
The output end of the power transmission drive circuit electrically connects with the power transmission coil, for after the power-up, to the power transmission
Electrical coil output signal；
The power transmission coil is used for when being applied in corresponding electric signal, is acted on neighbouring electricity reception coil, make it is described by
Electric coil produces alternating current.Further, the handwriting device also includes：Power supply modulate circuit and control unit；
The input of the power supply modulate circuit electrically connects with the output end of the power transmission circuit, the power supply modulate circuit
Output end electrically connected with described control unit, it is for when the power transmission circuit turns on, the power transmission circuit output end is defeated
Powered after the voltage conversion gone out to described control unit；
Described control unit, electrically connected with the second control terminal of the power transmission circuit, for after working on power, detecting
During the conducting of the switch, the power transmission circuit is controlled to turn on, and to the power transmission drive circuit output control signal, with control
The frequency of the power transmission drive circuit output electric signal.
Further, the power transmission circuit in the handwriting device includes：First triode, the second triode, first
Diode, the second diode, first resistor, second resistance, 3rd resistor and the 4th resistance；
First pole of first triode electrically connects with the input of the power transmission circuit, and the of first triode
Two poles electrically connect with the output end of the power transmission circuit, and the base stage of first triode passes through the first resistor and described the
The second pole electrical connection of two triodes；
One end of the second resistance electrically connects with the first pole of first triode, the other end of the second resistance
Electrically connected with the base stage of first triode；
The first pole ground connection of second triode, the base stage of second triode by the 3rd resistor with it is described
The output end electrical connection of control unit；
One end of 4th resistance connects with one end that the 3rd resistor is connected with described control unit；Described 4th
The other end ground connection of resistance；
First pole of first diode electrically connects with the second pole of second triode, first diode
Second pole electrically connects with the first control terminal of the power transmission circuit；
First pole of second diode electrically connects with described control unit, the second pole of second diode and institute
State the first pole electrical connection of the first diode.
Further, the power transmission drive circuit in the handwriting device uses LT4531.
Further, the frequency of the power transmission drive circuit output signal in the handwriting device is 0.25Hz.
Further, the switch in the handwriting device is key switch.
Second aspect, the embodiments of the invention provide a kind of liquid crystal handwriting board device, the liquid crystal handwriting board device include by
Electric coil and by electric drive circuit；
The electricity reception coil is used for and power transmission coil effect produces alternating current；
The input by electric drive circuit electrically connects with the electricity reception coil, the output end by electric drive circuit
Electrically connected with the membrane electrode on liquid crystal handwriting board device, for the alternating current in the electricity reception coil to be converted into direct current simultaneously
Output is to the membrane electrode, to wipe the content that liquid crystal handwriting board device is shown.
Further, the liquid crystal handwriting board device also includes the first electric capacity；
First electric capacity is parallel to the both ends of the electricity reception coil；
It is described to be included bridge rectifier and the second electric capacity, two inputs of the bridge rectifier by electric drive circuit
Hold both ends respectively with the electricity reception coil to electrically connect, two output ends of the bridge rectifier respectively with two thin-film electros
Pole electrically connects；
Second electric capacity is parallel to two output ends of the bridge rectifier.
Further, the liquid crystal handwriting board device also includes voltage-regulator diode and the 3rd triode；
Two output ends of the first pole and the second pole of 3rd triode respectively with the bridge rectifier are electrically connected
Connect；
First pole of the voltage-regulator diode electrically connects with the base stage of the 3rd triode, and the of the voltage-regulator diode
Two poles electrically connect with the second pole of the 3rd triode.
The third aspect, the embodiments of the invention provide a kind of method for deleting of liquid crystal handwriting board device, the method for deleting is fitted
For handwriting device and liquid crystal handwriting board device, including：
Handwriting device is by wireless power delivery mode to the liquid crystal handwriting board device power transmission；
The electrical energy drive that liquid crystal handwriting board device transmits according to the handwriting device wipes the display of liquid crystal handwriting board device
Content.
Further, the handwriting device includes power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil；Institute
The input for stating power transmission circuit electrically connects with the output end of the power supply, output end and the power transmission drive circuit of the power transmission circuit
Power input electrical connection, the first control terminal of the power transmission circuit with it is described switch electrically connect, the power transmission drive circuit
Output end electrically connected with the power transmission coil；
Liquid crystal handwriting board device includes electricity reception coil and by electric drive circuit；The input and institute by electric drive circuit
Electricity reception coil electrical connection is stated, the output end by electric drive circuit electrically connects with the membrane electrode on liquid crystal handwriting board device；
The method for deleting also includes：
During the switch conduction, the power transmission circuit turns on, electricity, the power transmission drive circuit on the power transmission drive circuit
Electric signal is exported to the power transmission coil；
The power transmission coil acts on the electricity reception coil, and the electricity reception coil produces alternating current；It is described electric by electric drive
The alternating current is converted to direct current and exported to the membrane electrode by road, and the content shown on liquid crystal handwriting board device is wiped
Remove.
Further, the handwriting device also includes power supply modulate circuit and control unit；
The input of the power supply modulate circuit electrically connects with the output end of the power transmission circuit, the power supply modulate circuit
Output end electrically connected with described control unit；
Described control unit electrically connects with the second control terminal of the power transmission circuit；
The method for deleting also includes：
During the power transmission circuit conducting, whether electricity in described control unit, the described control unit detection switch turns on,
In the switch conduction, the first control signal is sent to the power transmission circuit, to control the power transmission circuit constant conduction.
Further, the method for deleting also includes：In described control unit after electricity, monitor the switch conduction when
Long, if the duration of the switch conduction is more than preset duration, described control unit stops sending first control signal；Such as
The time of switch conduction described in fruit is less than the preset duration, and described control unit persistently sends the first control to the power transmission circuit
Signal processed, until when the duration of power transmission circuit conducting is more than or equal to the preset duration, described control unit is sent to described
Circuit sends the second control signal, to control the power transmission circuit to turn off；
Wherein, the preset duration is more than or equal to the content that liquid crystal handwriting board device erasing is shown and needs to be powered most
Small duration.
Technical scheme provided in an embodiment of the present invention, by power supply, switch, power transmission circuit, power transmission drive circuit and power transmission line
Circle is arranged in handwriting device, is arranged on by electricity reception coil and by electric drive circuit in liquid crystal handwriting board device, by wirelessly sending
Electrically, handwriting device realizes the purpose for removing liquid crystal handwriting board device display content to liquid crystal handwriting board device power transmission；This side
The mode that case separates by using erasing switch with handwriting pad, can avoid the mistake of written contents on handwriting pad from wiping, and improve hand-written
The flexibility of plate；Meanwhile solving that liquid crystal handwriting board device is extremely difficult to accomplish dustproof and waterproof, the application place limitation of product design is larger
The problem of, realize that liquid crystal handwriting board device seals, accomplish the requirement of dustproof and waterproof, the field of employment of product design is more.
Brief description of the drawings
Fig. 1 is a kind of circuit structure block diagram for handwriting device that the embodiment of the present invention one provides.
Fig. 2 is a kind of circuit structure block diagram for liquid crystal handwriting board device that the embodiment of the present invention one provides.
Fig. 3 is the circuit structure block diagram for another handwriting device that the embodiment of the present invention one provides.
Fig. 4 is a kind of circuit diagram for handwriting device that the embodiment of the present invention two provides.
Fig. 5 is a kind of circuit diagram for liquid crystal handwriting board device that the embodiment of the present invention three provides.
Fig. 6 is the circuit diagram for another liquid crystal handwriting board device that the embodiment of the present invention three provides.
Fig. 7 is the flow chart of the method for deleting for the liquid crystal handwriting board device that the embodiment of the present invention four provides.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
Fig. 1 is a kind of circuit structure block diagram for handwriting device that the embodiment of the present invention one provides.As shown in figure 1, this is hand-written
Device includes power supply 101, switch 102, power transmission circuit 103, power transmission drive circuit 104 and power transmission coil 105；
The input Vin of power transmission circuit 103 electrically connects with the output end of power supply 101, the output end vo ut of power transmission circuit 103
Electrically connected with the power input of power transmission drive circuit 104, the first control terminal ctrl1 and the switch 102 of power transmission circuit 103 are electrically connected
Connect, it is defeated that the voltage of the output end of power supply 101 is transmitted into power supply to power transmission drive circuit 104 for the control according to switch 102
Enter end；
The output end vo ut of power transmission drive circuit 104 electrically connects with power transmission coil 105, for after the power-up, to power transmission line
The output electric signal of circle 105；
Power transmission coil 105 is used for when being applied in corresponding electric signal, is acted on neighbouring electricity reception coil, makes electricity reception coil
Produce alternating current.
Fig. 2 is a kind of circuit structure block diagram for liquid crystal handwriting board device that the embodiment of the present invention one provides, as shown in Fig. 2
The liquid crystal handwriting board device includes electricity reception coil 201 and by electric drive circuit 202；
Electricity reception coil 201 is used for and the effect of power transmission coil 105 produces alternating current；Such as and Fig. 1 shown in handwriting device on
Power transmission coil effect produce alternating current.
Electrically connected by the input of electric drive circuit 202 with electricity reception coil 201, by electric drive circuit 202 output end with
Membrane electrode electrical connection on liquid crystal handwriting board device, for the alternating current in electricity reception coil 201 to be converted into direct current and defeated
Go out to membrane electrode, to wipe the content that liquid crystal handwriting board device is shown.
Below using the liquid crystal handwriting board device shown in the handwriting device and Fig. 2 shown in Fig. 1 as example, illustrate the work of the two
Process.Wherein switch 102 can be key switch, and handwriting device can be writing pencil.Exemplarily, by handwriting device close to liquid
Brilliant handwriting board device, the switch 102 on handwriting device, the closure conducting of switch 102 are pressed, control power transmission circuit 103 turns on, power transmission
After circuit 103 turns on, the voltage of the output end of power supply 101 is transmitted to the power input Vin of power transmission drive circuit 104, power transmission
It is electric on drive circuit 104, on power transmission drive circuit 104 after electricity, electric signal is exported to power transmission coil 105, electric signal, which is carried in, to be sent
After electric coil 105, power transmission coil 105 can act on the electricity reception coil 201 on neighbouring liquid crystal handwriting board device, electricity reception coil
201 produce alternating current.The alternating current in electricity reception coil 201 is converted into direct current by electric drive circuit 202 and exported to film
Electrode, the content shown on liquid crystal handwriting board device is wiped.
Technical scheme provided in an embodiment of the present invention, by power supply, switch, power transmission circuit, power transmission drive circuit and power transmission line
Circle is arranged in handwriting device, is turned on by switching control power transmission circuit, and then being total in power transmission circuit and power transmission drive circuit
Under same-action, to power transmission electrical coil output signal, power transmission coil can be acted on the electricity reception coil on liquid crystal handwriting board device and produced
Raw alternating current, the alternating current in electricity reception coil is converted into direct current by electric drive circuit and exported to membrane electrode, realization pair
The erasing of liquid crystal handwriting board device display content.Because switch and power supply are arranged on handwriting device, handwriting device passes through nothing
The mode of line power transmission transmits electric energy to liquid crystal handwriting board device, and then realizes the erasing of display content on liquid crystal handwriting board device.
The mode that the technical program separates by using erasing switch with handwriting pad, can avoid the mistake of written contents on handwriting pad from wiping,
Improve the flexibility of handwriting pad；Meanwhile liquid crystal handwriting board device easily seals, liquid crystal handwriting board device easily meets wanting for waterproof
Ask, improve the application of liquid crystal handwriting board device, application places are more extensive.
Further, as shown in figure 3, Fig. 3 is the circuit block diagram for another handwriting device that the embodiment of the present invention one provides,
On the basis of circuit shown in Fig. 1, handwriting device also includes power supply modulate circuit 106 and control unit 107；
The input of power supply modulate circuit 106 electrically connects with the output end vo ut of power transmission circuit 103, power supply modulate circuit
106 output end electrically connects with control unit 107, for when power transmission circuit 103 turns on, by the output end of power transmission circuit 103
Powered after the voltage conversion of Vout outputs to control unit 107；
Control unit 107, electrically connected with the second control terminal ctrl2 of power transmission circuit 103, for after working on power, examining
When measuring the conducting of switch 102, control power transmission circuit 103 turns on, and to the output control signal of power transmission drive circuit 104, with control
Power transmission drive circuit 104 processed exports the frequency of electric signal.
Technical scheme provided in an embodiment of the present invention, the conducting of the control power transmission circuit 103 of switch 102 can be both used, to
Power transmission coil 105 provides electric signal, by control unit 107 power transmission circuit 103 can also be controlled to turn on, and then to power transmission coil
105 provide electric signal.Specifically, switch 102 turns on when pressed；Disconnected when not being pressed.When switching 102 conducting,
Power transmission circuit 103 turns on, electric on power transmission drive circuit 104 and control unit 107, and whether the detection switch 102 of control unit 107 is led
It is logical, when detecting the conducting of switch 102, the first control signal is sent to power transmission circuit 103, control power transmission circuit 103 is persistently led
Logical, now if switch 102 disconnects, control unit 107 can also continue the control constant conduction of power transmission circuit 103.In power transmission electricity
When the conducting duration of road 103 is more than preset duration, control unit 107 can send the second control signal to power transmission circuit 103, and control be sent
Circuit 103 turns off.
The present invention implements the technical scheme provided, and switch 102 can be key switch, when user is by switching 102 next time
Afterwards, the constant conduction of power transmission circuit 103 can be controlled with control unit 107, and then the electricity of enough time length is sent to power transmission coil 105
Signal.User can also long-press switch 102, by switch 102 directly control power transmission circuit 103 turn-on and turn-off.Specifically, control
On unit 107 processed after electricity, whether detection switch 102 turns on, when detection switch 102 turns on, then the duration that monitoring switch 102 turns on
Whether reach preset duration, if the durations of the conducting of switch 102 are more than preset duration, stop to the transmission of power transmission circuit 103 the
One control signal, in subsequent period of time, when switching 102 and disconnecting, power transmission circuit 103 also disconnects.
Wherein, power supply modulate circuit 106 can be voltage adjuster.Such as can be divider resistance, exported for adjusting
To the voltage of control unit.
Wherein, control unit 107 can be single-chip microcomputer micro control system.
Embodiment two
Fig. 4 is a kind of circuit diagram for handwriting device that the embodiment of the present invention two provides, as shown in figure 4, in above-described embodiment
On the basis of, the power transmission circuit 103 in handwriting device includes：First triode Q1, the second triode Q2, the first diode D1,
Second diode D2, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4；
First triode Q1 the first pole 111 electrically connects with the input Vin of power transmission circuit 103, the first triode Q1's
Second pole 112 electrically connects with the output end vo ut of power transmission circuit 103, and the first triode Q1 base stage 113 passes through first resistor R1
Electrically connected with the second triode Q2 the second pole 122；
Second resistance R2 one end electrically connects with the first triode Q1 the first pole 111, the second resistance R2 other end with
First triode Q1 base stage 113 electrically connects；
Second triode Q2 the first pole 121 is grounded, and the second triode Q2 base stage 123 passes through 3rd resistor R3 and control
The output end electrical connection of unit 107；
4th resistance R4 one end connects with one end that 3rd resistor R3 is connected with control unit 107；4th resistance R4's
The other end is grounded；
First diode D1 the first pole 131 electrically connects with the second triode Q2 the second pole 123, the first diode D1's
Second pole 132 electrically connects with the first control terminal ctrl1 of power transmission circuit 103；
Second diode D2 the first pole 141 electrically connects with control unit 107, the second diode D2 the second pole 142 with
First diode D1 the first pole 131 electrically connects.
Wherein, first resistor R1 is used for the first triode Q1 current limlitings, and 3rd resistor R3 is used to limit the second triode Q2
Stream, first resistor R1 and 3rd resistor R3 optional resistance value scope are 1K Ω -5.1K Ω, and preferable resistance value is 2.2K
Ω。
Wherein, second resistance R2 and the 4th resistance R4 optional resistance value scope is 10K Ω -100K Ω, preferable electricity
Resistance is 10K Ω.
Wherein, the first diode D1 and the second diode D2 is set for signaling traffic, and design parameter value is not construed as limiting.
Wherein, the first triode Q1 and the second triode Q2 is used for the break-make of control circuit, and design parameter value does not limit.
Power transmission drive circuit 204 can use LT4531.
The frequency of the output signal of power transmission drive circuit 204 is 0.25Hz.
Exemplary, the switch 102 in handwriting device can be key switch.
With reference to the circuit shown in Fig. 4, using the first triode Q1 as NPN type triode, the second triode Q2 is positive-negative-positive
Triode is example, illustrates the course of work of handwriting device provided in an embodiment of the present invention.It is not pressed wherein, opens in switch S1
S1 shut-offs are closed, because the 4th resistance R4 drop-down acts on, the second triode Q2 base stage is low level, and the second triode Q2 is closed
It is disconnected.Because second resistance R2 pull-up acts on, the first triode Q1 base stage is high level, and the first triode Q1 is turned off.Power transmission
Drive circuit 104 is powered without power supply, does not export electric signal.It is pressed in switch S1, switch S1 conductings, the first triode Q1's
Base stage is low level, and the first triode Q1 is turned on, and the voltage of the output end of power supply 101 is supplied to power transmission drive circuit 104, and power transmission is driven
Electricity on dynamic circuit 104, exports electric signal；The voltage of the output end of power supply 101 is after the conversion of power supply modulate circuit 106, output to control
Unit 107 processed, electricity, control unit 107 can output control signals to power transmission drive circuit 104 in control unit 107, and control is sent
Electric drive circuit 104 exports the frequency of electric signal, so that the frequency for the electric signal that power transmission drive circuit 104 exports meets to require,
It can act on power transmission coil 105 and electricity reception coil 201, electricity reception coil 201 produces alternating current.Can after electricity in control unit 107
To export high level signal to 3rd resistor R3 and the 4th resistance R4 public connecting end, the second triode Q2 base stage is high electricity
Flat, the second triode Q2 conductings, the first triode Q1 base stage is low level, controls the first triode Q1 constant conductions, now,
Even if switching S1 shut-offs, the one or three pole Q1 pipe constant conductions can also be controlled by control unit 107.The detection of control unit 107 is opened
The duration for closing S1 conductings reaches preset duration, such as the duration of detection switch S1 conductings reaches 2s, in the duration of switch S1 conductings
During less than preset duration, control unit 107 persistently exports high level signal to 3rd resistor R3 and the 4th resistance R4 public company
End, the second triode Q2 conductings are connect, and then controls the first triode Q1 constant conductions.Grown up when the first triode Q1 is turned on
When preset duration, the output low level signal of control unit 107 to 3rd resistor R3 and the 4th resistance R4 public connecting end, the
Two triode Q2 are turned off.Because second resistance R2 pull-up acts on, the first triode Q1 base stage is high level, the first triode
Q1 is turned off.If control unit 107 detects that the time of switch S1 conductings reaches preset duration, control unit 107 stops output
High level signal is to 3rd resistor R3 and the 4th resistance R4 public connecting end, or exports low level signal to 3rd resistor R3
With the 4th resistance R4 public connecting end, the second triode Q2 shut-offs.Because switch S1 is also turned on, the first triode Q1 base stage
For low level, the first triode Q1 constant conductions.If in follow-up time, switch S1 shut-offs, because second resistance R2 pull-up is made
With, then the first triode Q1 base stage is high level, and the first triode Q1 is turned off, that is, when switching S1 shut-offs, the first triode Q1
Shut-off, whole power transmission circuit 103 turn off.
It should be noted that due to wiping display content on liquid crystal handwriting board device, it is necessary to be exported to liquid crystal film electrode
The duration of voltage meets certain requirements, it is therefore desirable to and the duration of power transmission circuit conducting meets certain requirement, and then to power transmission line
The duration that circle provides electric signal meets certain requirement.Therefore preset duration needs aobvious more than or equal to the erasing of liquid crystal handwriting board device
The minimum duration that the content needs shown are powered.
The technical scheme that the present embodiment provides, power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil are set
It is placed in handwriting device, is turned on by ON-OFF control circuit, can be passed through under power transmission circuit and the collective effect of power transmission drive circuit
From circuit power supply of the power transmission coil into external circuit, that is, liquid crystal handwriting board device.
Embodiment three
Fig. 5 is a kind of circuit diagram for liquid crystal handwriting board device that the embodiment of the present invention three provides, as shown in figure 5, implementing
On the basis of example one, liquid crystal handwriting board device also includes the first electric capacity C1；
First electric capacity C1 is parallel to the both ends of electricity reception coil 201；
It is defeated by electric drive circuit 202 two including bridge rectifier BD and the second electric capacity C2, bridge rectifier BD
Enter both ends of the end respectively with electricity reception coil 201 to electrically connect, bridge rectifier BD two output ends respectively with two thin-film electros
Pole electrically connects；
Second electric capacity C2 is parallel to bridge rectifier BD two output ends.
Wherein, the first electric capacity C1 is used to remove signal interference after electricity reception coil 201 receives electric energy.
Wherein, bridge rectifier BD includes four diodes, respectively the 3rd diode D3, the 4th diode D4,
5th diode D5 and the 6th diode D6, because the frequency for transmitting electric energy is higher, four diodes preferably use Schottky
Diode.
Wherein, the second electric capacity C2 is used for the filter capacitor of rectifying and wave-filtering, preferably 100V/47 μ f.
Further, as shown in fig. 6, Fig. 6 is the electricity for another liquid crystal handwriting board device that the embodiment of the present invention three provides
Lu Tu, liquid crystal handwriting board device also include voltage-regulator diode ZD and the 3rd triode Q3；
Two output ends of 3rd triode Q3 the first pole 211 and the second pole 212 respectively with bridge rectifier are electrically connected
Connect；
Voltage-regulator diode ZD the first pole 221 electrically connects with the 3rd triode Q3 base stage 213, and the of voltage-regulator diode ZD
Two poles 222 electrically connect with the 3rd triode Q3 the second pole 212.
Wherein, voltage-regulator diode ZD is preferably 25V voltage-regulator diode.
Wherein, the 3rd triode Q3 is used to coordinate ZD to carry out voltage stabilizing, when the operating current of liquid crystal handwriting board device is less than
During 100mA, the 3rd triode Q3 electric current choosing value scope is 200mA-500mA.
To sum up, exemplary, the circuit diagram for the liquid crystal handwriting board device that the present embodiment provides is as shown in fig. 6, the liquid crystal hand
Writing panel assembly includes electricity reception coil L2 (i.e. electricity reception coil 201), the first electric capacity C1, the 3rd diode D3, the 4th diode D4, the
Five diode D5, the 6th diode D6, the second electric capacity C2, voltage-regulator diode ZD and the 3rd triode Q3.
Example IV
Fig. 7 is the flow chart of the method for deleting for the liquid crystal handwriting board device that the embodiment of the present invention four provides, and is applicable to this
The handwriting device and liquid crystal handwriting board device that invention any embodiment provides.This method specifically includes：
Step 710, handwriting device are by wireless power delivery mode to the liquid crystal handwriting board device power transmission；
The electrical energy drive that step 730, liquid crystal handwriting board device transmit according to the handwriting device wipes liquid crystal handwriting pad dress
The display content put.
Wherein, it is exemplary, refer to handwriting device shown in the circuit and Fig. 4 of liquid crystal handwriting board device shown in Fig. 6
Circuit, step 710 specifically comprise the following steps：
The conducting of switch 102；Power transmission circuit 103 turns on；It is electric on power transmission drive circuit 104；Power transmission drive circuit 104 exports electricity
Signal is to power transmission coil 105.
Power transmission coil 105 acts on electricity reception coil 201, and electricity reception coil 201 produces alternating current.
Step 730 specifically includes：
Alternating current is converted into direct current by electric drive circuit 202 and exported to membrane electrode, on liquid crystal handwriting board device
The content of display is removed.
Further, when power transmission circuit 103 turns on, electricity in control unit 107, whether the detection switch 102 of control unit 107
Conducting, when switching 102 conducting, the first control signal is sent to power transmission circuit 103, to control the constant conduction of power transmission circuit 103.
Specifically, in control unit 107 after electricity, the duration of the conducting of monitoring switch 102, if the durations of the conducting of switch 102
More than preset duration, control unit 107 stops sending the first control signal；If the time of the conducting of switch 102 is less than default
Long, control unit 107 persistently sends the first control signal to power transmission circuit 103, until the duration that power transmission circuit 103 turns on is more than
During equal to preset duration, control unit 107 sends the second control signal to power transmission circuit 103, to control power transmission circuit 103 to close
It is disconnected；
Wherein, the preset duration is more than or equal to the content that liquid crystal handwriting board device erasing is shown and needs to be powered most
Small duration.
Exemplary, the circuit with reference to shown in Fig. 4, using the first triode Q1 as NPN type triode, the second triode Q2 is
PNP type triode is example, illustrates the idiographic flow of the method for deleting of liquid crystal handwriting board device provided in an embodiment of the present invention.Its
In, be not pressed in switch S1 (switching 102), that is, when switching S1 shut-offs, because second resistance R2 pull-up acts on, the one or three
Pole pipe Q1 base stage is high level, and the first triode Q1 is off state；Because the 4th resistance R4 drop-down acts on, the two or three
Pole pipe Q2 base stage is low level, and the second triode Q2 is off state.Now, power transmission drive circuit 104 supplies without power supply
Electricity, do not export electric signal.Being pressed in switch S1, that is, when switching S1 conductings, the first triode Q1 base stage is low level, first
Triode Q1 is turned on, and the voltage of the output end of power supply 101 is supplied to power transmission drive circuit 104, and electricity on power transmission drive circuit 104 is defeated
Go out electric signal；The voltage of the output end of power supply 101 exports single to control unit 107, control after the conversion of power supply modulate circuit 106
Electricity in member 107, control unit 107 can output control signals to power transmission drive circuit 104, and control power transmission drive circuit 104 is defeated
Go out the frequency of electric signal, so that the frequency for the electric signal that power transmission drive circuit 104 exports meets to require, power transmission coil can be made
105 and electricity reception coil 201 act on, electricity reception coil 201 produce alternating current.High level letter can be exported in control unit 107 after electricity
Number to 3rd resistor R3 and the 4th resistance R4 public connecting end, the second triode Q2 base stage is high level, the second triode
Q2 is turned on, and the first triode Q1 base stage is low level, controls the first triode Q1 constant conductions, now, even if switch S1 is closed
It is disconnected, the one or three pole Q1 pipe constant conductions can also be controlled by control unit 107.Specifically, the detection switch S1 of control unit 107 is led
Whether logical duration reaches preset duration, such as whether the duration of detection switch S1 conductings reaches 2s, when switch S1 is turned on
Long when being less than preset duration, it is public to 3rd resistor R3 and the 4th resistance R4 that control unit 107 persistently exports high level signal
Connection end, the second triode Q2 conductings, and then control the first triode Q1 constant conductions.In the duration of the first triode Q1 conductings
During more than preset duration, the output low level signal of control unit 107 to 3rd resistor R3 and the 4th resistance R4 public connecting end,
Second triode Q2 is turned off；Because second resistance R2 pull-up acts on, the first triode Q1 base stage is high level, the one or three pole
Pipe Q1 is turned off.If control unit 107 detects that the time of switch S1 conductings reaches preset duration, control unit 107 stops defeated
Go out high level signal to 3rd resistor R3 and the 4th resistance R4 public connecting end, or export low level signal to 3rd resistor
R3 and the 4th resistance R4 public connecting end, the second triode Q2 shut-offs；Because switch S1 is also turned on, the first triode Q1 base
Extremely low level, the first triode Q1 constant conductions.If in follow-up time, switch S1 shut-offs, due to second resistance R2 pull-up
Effect, then the first triode Q1 base stage is high level, and the first triode Q1 is turned off, that is, when switching S1 shut-offs, the first triode
Q1 is turned off, and whole power transmission circuit 103 turns off.
It should be noted that due to wiping display content on liquid crystal handwriting board device, it is necessary to be exported to liquid crystal film electrode
The duration of voltage meets certain requirements, it is therefore desirable to and the duration of power transmission circuit conducting meets certain requirement, and then to power transmission line
The duration that circle provides electric signal meets certain requirement.Therefore preset duration needs aobvious more than or equal to the erasing of liquid crystal handwriting board device
The minimum duration that the content needs shown are powered.
Wherein, it is exemplary, the circuit diagram of the liquid crystal handwriting board device in three shown in Fig. 6 in conjunction with the embodiments, specifically, by
Electric coil L2 receives the ac signal that power transmission coil L1 is sent, and ac signal goes flash removed to disturb by the first electric capacity C1
Afterwards, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6 composition bridge rectifier BD and
Ac signal is converted to DC signal by the second electric capacity C2, and DC signal is through voltage-regulator diode ZD and the 3rd triode Q3
Pressure stabilization function after stable output to liquid crystal film electrode, so as to which the content shown on liquid crystal handwriting board device is removed.
The technical scheme that the present embodiment provides, by way of wireless power transmission, the power supply set in handwriting device is provided
Electric energy be sent to liquid crystal handwriting board device, the electrical energy drive erasing liquor that liquid crystal handwriting board device transmits according to the handwriting device
The display content of brilliant handwriting board device, solving liquid crystal handwriting board device can not be sealed, nothing due to the presence of power supply, switch etc.
Method accomplishes the problem of dustproof and waterproof, liquid crystal handwriting board device is applicable to more occasion；Meanwhile switched by using erasing
The mode separated with handwriting pad, the mistake of written contents on handwriting pad can be avoided to wipe, improve the flexibility of handwriting pad.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (13)
1. a kind of handwriting device, it is characterised in that including power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil；
The input of the power transmission circuit is electrically connected with the output end of the power supply, and output end and the power transmission of the power transmission circuit are driven
The power input electrical connection of dynamic circuit, the first control terminal of the power transmission circuit electrically connects with the switch, for according to institute
The control for stating switch transmits the voltage of the output end of the power supply to the power input of the power transmission drive circuit；
The output end of the power transmission drive circuit electrically connects with the power transmission coil, for after the power-up, to the power transmission coil
Export electric signal；
The power transmission coil is used for when being applied in corresponding electric signal, is acted on neighbouring electricity reception coil, makes described by electric wire
Circle produces alternating current.
2. handwriting device according to claim 1, it is characterised in that also including power supply modulate circuit and control unit；
The input of the power supply modulate circuit electrically connects with the output end of the power transmission circuit, the power supply modulate circuit it is defeated
Go out end to electrically connect with described control unit, for when the power transmission circuit turns on, the power transmission circuit output end to be exported
Powered after voltage conversion to described control unit；
Described control unit, electrically connected with the second control terminal of the power transmission circuit, it is described for after working on power, detecting
During the conducting of switch, the power transmission circuit is controlled to turn on, and to the power transmission drive circuit output control signal, with described in control
Power transmission drive circuit exports the frequency of electric signal.
3. handwriting device according to claim 2, it is characterised in that the power transmission circuit includes：First triode, second
Triode, the first diode, the second diode, first resistor, second resistance, 3rd resistor and the 4th resistance；
First pole of first triode electrically connects with the input of the power transmission circuit, the second pole of first triode
Electrically connected with the output end of the power transmission circuit, the base stage of first triode passes through the first resistor and the described 2nd 3
The second pole electrical connection of pole pipe；
One end of the second resistance electrically connects with the first pole of first triode, the other end of the second resistance and institute
State the base stage electrical connection of the first triode；
The first pole ground connection of second triode, the base stage of second triode pass through the 3rd resistor and the control
The output end electrical connection of unit；
One end of 4th resistance connects with one end that the 3rd resistor is connected with described control unit；4th resistance
The other end ground connection；
First pole of first diode electrically connects with the second pole of second triode, and the second of first diode
Pole electrically connects with the first control terminal of the power transmission circuit；
First pole of second diode electrically connects with described control unit, the second pole of second diode and described the
The first pole electrical connection of one diode.
4. handwriting device according to claim 2, it is characterised in that the power transmission drive circuit uses LT4531.
5. handwriting device according to claim 4, it is characterised in that the frequency of the power transmission drive circuit output signal is
0.25Hz。
6. handwriting device according to claim 1, it is characterised in that the switch is key switch.
7. a kind of liquid crystal handwriting board device, it is characterised in that including electricity reception coil and by electric drive circuit；
The electricity reception coil is used for and power transmission coil effect produces alternating current；
The input by electric drive circuit electrically connects with the electricity reception coil, the output end and liquid by electric drive circuit
Membrane electrode electrical connection on brilliant handwriting board device, for the alternating current in the electricity reception coil to be converted into direct current and exported
To the membrane electrode, to wipe the content that liquid crystal handwriting board device is shown.
8. liquid crystal handwriting board device according to claim 7, it is characterised in that also including the first electric capacity；
First electric capacity is parallel to the both ends of the electricity reception coil；
It is described to be included bridge rectifier and the second electric capacity, two inputs point of the bridge rectifier by electric drive circuit
Both ends not with the electricity reception coil electrically connect, two output ends of the bridge rectifier respectively with two membrane electrode electricity
Connection；
Second electric capacity is parallel to two output ends of the bridge rectifier.
9. liquid crystal handwriting board device according to claim 8, it is characterised in that also including voltage-regulator diode and the three or three pole
Pipe；
The first pole and the second pole of 3rd triode electrically connect with two output ends of the bridge rectifier respectively；
First pole of the voltage-regulator diode electrically connects with the base stage of the 3rd triode, the second pole of the voltage-regulator diode
Electrically connected with the second pole of the 3rd triode.
10. a kind of method for deleting of liquid crystal handwriting board device, it is characterised in that filled suitable for handwriting device and liquid crystal handwriting pad
Put, including：
Handwriting device is by wireless power delivery mode to the liquid crystal handwriting board device power transmission；
The electrical energy drive that liquid crystal handwriting board device transmits according to the handwriting device wipes the display content of liquid crystal handwriting board device.
11. the method for deleting of liquid crystal handwriting board device according to claim 10, it is characterised in that the handwriting device bag
Include power supply, switch, power transmission circuit, power transmission drive circuit and power transmission coil；The input of the power transmission circuit and the power supply
Output end electrically connects, and the output end of the power transmission circuit electrically connects with the power input of power transmission drive circuit, the power transmission electricity
First control terminal on road electrically connects with the switch, and the output end of the power transmission drive circuit electrically connects with the power transmission coil；
Liquid crystal handwriting board device includes electricity reception coil and by electric drive circuit；The input by electric drive circuit with it is described by
Electric coil electrically connects, and the output end by electric drive circuit electrically connects with the membrane electrode on liquid crystal handwriting board device；
The method for deleting includes：
During the switch conduction, the power transmission circuit turns on, electricity on the power transmission drive circuit, the power transmission drive circuit output
Electric signal is to the power transmission coil；
The power transmission coil acts on the electricity reception coil, and the electricity reception coil produces alternating current；
It is described that the alternating current is converted into direct current by electric drive circuit and exported to the membrane electrode, liquid crystal handwriting pad dress
Put the content erasing of display.
12. method for deleting according to claim 11, it is characterised in that the handwriting device also includes power supply modulate circuit
And control unit；
The input of the power supply modulate circuit electrically connects with the output end of the power transmission circuit, the power supply modulate circuit it is defeated
Go out end to electrically connect with described control unit；
Described control unit electrically connects with the second control terminal of the power transmission circuit；
The method for deleting also includes：
During the power transmission circuit conducting, whether electricity in described control unit, the described control unit detection switch turns on, in institute
When stating switch conduction, the first control signal is sent to the power transmission circuit, to control the power transmission circuit constant conduction.
13. method for deleting according to claim 12, it is characterised in that in described control unit after electricity, opened described in monitoring
The duration of conducting is closed, if the duration of the switch conduction is more than preset duration, described control unit stops sending described first
Control signal；If the time of the switch conduction is less than the preset duration, described control unit is held to the power transmission circuit
Supervention send the first control signal, until when the duration of power transmission circuit conducting is more than or equal to the preset duration, the control
Unit sends the second control signal to the power transmission circuit, to control the power transmission circuit to turn off；
Wherein, when the preset duration is more than or equal to the minimum that the content needs that liquid crystal handwriting board device erasing is shown are powered
It is long.
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|---|---|---|---|
| CN201710867590.1A CN107632735A (en) | 2017-09-22 | 2017-09-22 | A kind of handwriting device, liquid crystal handwriting board device and method for deleting |
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|---|---|---|---|
| CN201710867590.1A CN107632735A (en) | 2017-09-22 | 2017-09-22 | A kind of handwriting device, liquid crystal handwriting board device and method for deleting |
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ID=61102395
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108550349A (en) * | 2018-03-12 | 2018-09-18 | 深圳市昂米科技有限公司 | A kind of liquid crystal electron board |
| CN112904606A (en) * | 2020-12-28 | 2021-06-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
| CN113284471A (en) * | 2021-06-28 | 2021-08-20 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
| WO2023050067A1 (en) * | 2021-09-28 | 2023-04-06 | 京东方科技集团股份有限公司 | Array substrate, panel, handwriting board and driving method therefor |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002244806A (en) * | 2000-12-13 | 2002-08-30 | Wacom Co Ltd | Pen-shaped coordinate indicator |
| JP2008084310A (en) * | 2006-08-31 | 2008-04-10 | Semiconductor Energy Lab Co Ltd | Electronic pen and electronic pen system |
| JP2009205050A (en) * | 2008-02-29 | 2009-09-10 | Seiko Epson Corp | Projection system and projector |
| CN101587385A (en) * | 2001-09-03 | 2009-11-25 | 杨泰和 | Multifunctional wireless transmitting and receiving device |
| CN201359719Y (en) * | 2009-02-28 | 2009-12-09 | 成都吉锐触摸技术股份有限公司 | Hardware circuit structure of infrared touch screen |
| CN101957674A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwriting equipment and control method thereof |
| CN101957706A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwritten device |
| CN102184042A (en) * | 2011-05-25 | 2011-09-14 | 深圳市海云天教育测评有限公司 | Electronic handwriting pen capable of automatically erasing written content and realizing method thereof |
| US20120105362A1 (en) * | 2010-10-28 | 2012-05-03 | Cypress Semiconductor Corporation | Synchronizing a stylus with a capacitive sense array |
| CN202771412U (en) * | 2012-06-28 | 2013-03-06 | 太瀚科技股份有限公司 | Handwriting input device |
| CN203084669U (en) * | 2012-11-23 | 2013-07-24 | 比亚迪股份有限公司 | Capacitance pen and wireless charging system of same |
| JP2013205436A (en) * | 2012-03-27 | 2013-10-07 | Citizen Holdings Co Ltd | Display device |
| CN104182137A (en) * | 2013-05-28 | 2014-12-03 | 福建福昕软件开发股份有限公司北京分公司 | Method for erasing electronic handwriting on register plate |
| US20160357292A1 (en) * | 2015-06-02 | 2016-12-08 | Japan Display Inc. | Display system with touch detection function |
| US20170063145A1 (en) * | 2015-08-31 | 2017-03-02 | Qualcomm Incorporated | Methods and apparatus for controlling touchscreen interference |
| CN207424833U (en) * | 2017-09-22 | 2018-05-29 | 深圳市德安里科技有限公司 | A kind of handwriting device and liquid crystal handwriting board device |
-
2017
- 2017-09-22 CN CN201710867590.1A patent/CN107632735A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002244806A (en) * | 2000-12-13 | 2002-08-30 | Wacom Co Ltd | Pen-shaped coordinate indicator |
| CN101587385A (en) * | 2001-09-03 | 2009-11-25 | 杨泰和 | Multifunctional wireless transmitting and receiving device |
| JP2008084310A (en) * | 2006-08-31 | 2008-04-10 | Semiconductor Energy Lab Co Ltd | Electronic pen and electronic pen system |
| JP2009205050A (en) * | 2008-02-29 | 2009-09-10 | Seiko Epson Corp | Projection system and projector |
| CN201359719Y (en) * | 2009-02-28 | 2009-12-09 | 成都吉锐触摸技术股份有限公司 | Hardware circuit structure of infrared touch screen |
| CN101957674A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwriting equipment and control method thereof |
| CN101957706A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwritten device |
| US20120105362A1 (en) * | 2010-10-28 | 2012-05-03 | Cypress Semiconductor Corporation | Synchronizing a stylus with a capacitive sense array |
| CN102184042A (en) * | 2011-05-25 | 2011-09-14 | 深圳市海云天教育测评有限公司 | Electronic handwriting pen capable of automatically erasing written content and realizing method thereof |
| JP2013205436A (en) * | 2012-03-27 | 2013-10-07 | Citizen Holdings Co Ltd | Display device |
| CN202771412U (en) * | 2012-06-28 | 2013-03-06 | 太瀚科技股份有限公司 | Handwriting input device |
| CN203084669U (en) * | 2012-11-23 | 2013-07-24 | 比亚迪股份有限公司 | Capacitance pen and wireless charging system of same |
| CN104182137A (en) * | 2013-05-28 | 2014-12-03 | 福建福昕软件开发股份有限公司北京分公司 | Method for erasing electronic handwriting on register plate |
| US20160357292A1 (en) * | 2015-06-02 | 2016-12-08 | Japan Display Inc. | Display system with touch detection function |
| US20170063145A1 (en) * | 2015-08-31 | 2017-03-02 | Qualcomm Incorporated | Methods and apparatus for controlling touchscreen interference |
| CN207424833U (en) * | 2017-09-22 | 2018-05-29 | 深圳市德安里科技有限公司 | A kind of handwriting device and liquid crystal handwriting board device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108550349A (en) * | 2018-03-12 | 2018-09-18 | 深圳市昂米科技有限公司 | A kind of liquid crystal electron board |
| CN112904606A (en) * | 2020-12-28 | 2021-06-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
| CN112904606B (en) * | 2020-12-28 | 2022-03-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
| CN113284471A (en) * | 2021-06-28 | 2021-08-20 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
| CN113284471B (en) * | 2021-06-28 | 2022-09-02 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
| WO2023050067A1 (en) * | 2021-09-28 | 2023-04-06 | 京东方科技集团股份有限公司 | Array substrate, panel, handwriting board and driving method therefor |
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