CN208622411U - The drive system of bistable state multifunction electronic liquid crystal handwriting pad - Google Patents
The drive system of bistable state multifunction electronic liquid crystal handwriting pad Download PDFInfo
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- CN208622411U CN208622411U CN201821175403.XU CN201821175403U CN208622411U CN 208622411 U CN208622411 U CN 208622411U CN 201821175403 U CN201821175403 U CN 201821175403U CN 208622411 U CN208622411 U CN 208622411U
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Abstract
A kind of drive system of bistable state multifunction electronic liquid crystal handwriting pad comprising power circuit, booster circuit, AC control circuit, governor circuit, sampling feedback circuit and removing control circuit, power circuit is for providing low-tension supply；Booster circuit boosts for energy storage；AC control circuit is used to control the output of AC signal；Control circuit is removed for removing control；Sampling feedback circuit feeds back to governor circuit so that governor circuit adjusts booster circuit for carrying out boosting sampling to booster circuit；Governor circuit is for being controlled, to realize the driving of bi-stable electronic liquid crystal handwriting pad.The utility model is powered using low-voltage dc power supply, the conductive electrode of exportable High Level AC Voltage electron liquid crystal handwriting pad by circuits such as booster circuit and AC control circuits, it does not need alternating current 220V AC power supply, thus it not only applies more convenient safety, and can minimize, improve product integrated level.In addition, the utility model has the characteristics that closed loop model- following control, output power can be adjusted according to diaphragm electric parameter.
Description
[technical field]
The utility model relates to drive system, in particular to a kind of driving system of bistable state multifunction electronic liquid crystal handwriting pad
System.
[background technique]
" polymer dispersion that PDLC is the abbreviation of " Polymer Dispersed Liquid Crystal ", and Chinese is meant
Liquid crystal ", it constitutes composite membrane with the one layer of polymeric dispersing liquid crystal layer being clipped in the middle by two flexible conductive films and forms, and two are soft
Property conductive film on be etched with conductive electrode, conductive electrode for connecting drive system, when drive system by conductive electrode to soft
Property conductive film between liquid crystal layer when applying voltage, the liquid crystal molecule in liquid crystal layer is overturn under electric field action and is resetted,
So as to wipe out written handwriting.Traditional PDLC drive system needs 220V Alternating Current Power Supply, and not only power consumption is big, calorific value
Greatly, and its volume is larger, is not easy to minimize, thus it is unfavorable for integrated applying to this novel bistable electronic liquid crystal hand
It writes on plate.On the other hand, existing liquid crystal handwriting pad, is typically only capable to carry out full frame erasing, when pressing the clear of liquid crystal handwriting pad
When shielding button, the voltage for being applied to liquid crystal layer will overturn liquid crystal molecule whole in liquid crystal layer and wipe out full frame writing
Person's handwriting can not facilitate user to wipe local written handwriting, thus it is used with certain inconvenience.In addition, existing use
In the driving plate of PDLC, that there is also stand-by times is short, oneself power consumption is high, the uncontrollable disadvantage of output loading voltage, thus its
It needs to improve.
[utility model content]
The purpose of the utility model is to solve the above problems and to provide a kind of to be powered using low-voltage dc power supply, is low in energy consumption,
The drive system of bistable state multifunction electronic liquid crystal handwriting pad that is small in size and can realizing selective erase.
To achieve the above object, the utility model provides a kind of driving system of bistable state multifunction electronic liquid crystal handwriting pad
System, which is characterized in that it includes power circuit, booster circuit, AC control circuit, governor circuit and removes control circuit, institute
It states power circuit to be electrically connected with the booster circuit and governor circuit, is used to provide low-tension supply；The booster circuit and institute
Power circuit, AC control circuit and governor circuit electrical connection are stated, energy storage boosting is used for；The AC control circuit with it is described
Booster circuit and governor circuit electrical connection, are used to control the output of AC signal；The removing control circuit and the master control
Circuit electrical connection, is used to remove control；The governor circuit and the power circuit, booster circuit, AC control circuit and
Control circuit electrical connection is removed, is used to that booster circuit, AC control circuit collection to be removed control circuit and controlled, to realize
The driving of bi-stable electronic liquid crystal handwriting pad.
It further, further include sampling feedback circuit, the sampling feedback circuit and the governor circuit and the electricity that boosts
Road electrical connection, is used to carry out boosting sampling to the booster circuit, and feed back to the governor circuit so that governor circuit tune
The whole booster circuit.
Further, the removing control circuit is equipped with all erasing control and selective erase and controls two kinds of control functions,
When being chosen to be all erasing control functions, voltage that the AC control circuit exports under the control of the governor circuit
Higher than the critical voltage of liquid crystal molecule；When being chosen to be selective erase control function, the AC control circuit is in the master
Control the critical voltage that the voltage exported under the control of circuit is equal to liquid crystal molecule；The critical voltage is the liquid in liquid crystal handwriting pad
The brilliant molecule maximum voltage that no state change occurs.
Further, if the governor circuit at least provided with an AD sampling feedback port, a PWM output port and
Dry for providing the output control terminal mouth of output control signal.
Further, the governor circuit includes single-chip microcontroller U1 and capacitor C3, and the single-chip microcontroller U1, which is equipped with, is used for ground connection
The port DGND, the port VCC3V for connecting power supply and for provide the output control port P0 of signal, the port P1, the port P4,
The port P7, the port P8, the port P9, the port P10, the port RES；The port the DGND ground connection, the port VCC3V and the power supply
The positive electrode of circuit connects, and the port VCC3V is grounded through capacitor C3.
Further, the booster circuit include capacitor C5, capacitor C6, inductance L1, NPN type triode Q9, resistance R12,
Capacitor C2, capacitor C4, capacitor C7, resistance R3, resistance R5, resistance R6, PNP type triode Q3, NPN type triode Q4, Schottky
Diode D1 and Schottky diode D2；The capacitor C5, capacitor C6 are in parallel, and one end ground connection, the other end is commonly connected to
Between the common end of the port inductance L1 and VCC3V；The other end of the inductance L1 then respectively with the collector and electricity of triode Q9
Hold C7 connection；The emitter of the triode Q9 is grounded, and base stage is connected through the port P10 of resistance R12 and governor circuit；It is described
The other end of capacitor C7 is connect with 3 feet of Schottky diode D2；1 foot of Schottky diode D2 be connected to capacitor C4 with
Between the common end of capacitor C2, the other end of capacitor C2 is grounded；2 feet of Schottky diode D2 are connected to capacitor C4 and resistance
Between the common end of R5, the other end of resistance R5 is then connect with the base stage of resistance R6 and triode Q3 respectively；The hair of triode Q3
Emitter-base bandgap grading be connected to resistance R5 and capacitor C4 it is common end between, the collector of triode Q3 respectively with the end high-voltage output end HV and Xiao
2 feet of special based diode D1 connect；1 foot of Schottky diode D1 be connected to capacitor C7 and triode Q9 collector it
Between, 3 feet of Schottky diode D1 are connect with 1 foot of Schottky diode D2；The other end and triode Q4 of the resistance R6
Collector connection, triode Q4 emitter ground connection, base stage through the port P8 of resistance R3 and governor circuit connect；?
The FB for connecting the sampling feedback circuit is equipped between 3 feet of the Schottky diode D1 and 1 foot of Schottky diode D2
Tie point.
Further, the AC control circuit includes that output AC signal acts on bi-stable electronic liquid crystal handwriting pad
The port P0, the port P1 and the boosting electricity of two set control systems on two conductive electrodes, the first set control system and governor circuit
The end high-voltage output end HV on road connects；The height of the port P4 of second set control system and governor circuit, the port P9 and booster circuit
Press the connection of the end output end HV.
Further, first set control system includes PNP type triode Q5, NPN type triode Q1, three pole of NPN type
Pipe Q2, resistance R1, resistance R2, resistance R7, resistance R8, resistance R9, resistance R11；The base stage of the triode Q2 through resistance R11 with
The port P1 of governor circuit connects, and the emitter ground connection of triode Q2, collector is connect with resistance R9；Resistance R9's is another
One end is connect with the base stage of resistance R8 and triode Q5 respectively；The other end of resistance R8 then with the high-voltage output end HV of booster circuit
End connection.The emitter of triode Q5 and the end high-voltage output end HV of booster circuit connect, and the collector of triode Q5 is through electricity
Resistance R7 is connect with the first conductive electrode N of bi-stable electronic liquid crystal handwriting pad；The base stage of the triode Q1 is through resistance R2 and master
The port the P0 connection of circuit is controlled, the emitter ground connection of triode Q1, collector is through resistance R1 and bi-stable electronic liquid crystal hand
Write the first conductive electrode N connection of plate.
Further, second set control system includes PNP type triode Q7, NPN type triode Q6, three pole of NPN type
Pipe Q8, resistance R18, resistance R19, resistance R14, resistance R17, resistance R15, resistance R20；The base stage of the triode Q8 is through resistance
The connection of the port P4 of R15 and governor circuit, the emitter ground connection of triode Q8, collector are connect with resistance R19；Resistance
The other end of R19 is connect with the base stage of resistance R18 and triode Q7 respectively；The other end of resistance R18 then with the height of booster circuit
Press the connection of the end output end HV；The emitter of triode Q7 and the end high-voltage output end HV of booster circuit connect, triode Q7's
Collector is connect through resistance R17 with the second conductive electrode P of bi-stable electronic liquid crystal handwriting pad；The base stage of the triode Q6
It is connected through the port P9 of resistance R20 and governor circuit, the emitter of triode Q6 ground connection, collector is through resistance R14 and double
Second conductive electrode P connection of steady state electronic liquid crystal handwriting pad.
Further, the sampling feedback circuit includes resistance R4, resistance R10, resistance R13, one end of the resistance R13
Ground connection, the other end are electrically connected with the port P7 of one end of resistance R10 and governor circuit, the other end and electricity of the resistance R10
One end electrical connection of R4 is hindered, the other end of resistance R4 is electrically connected with the FB tie point of booster circuit.
Further, the power circuit includes that can provide the battery of 3.0V DC voltage and be electrically connected just with the battery
Electrode and negative electrode, the positive electrode are electrically connected with the governor circuit and booster circuit, the negative electrode ground connection；The removing
Control circuit includes switch SW1, and one end of the switch SW1 is electrically connected with the port RES of the governor circuit, the switch
The other end of SW1 is grounded.
The meaning contribution of the utility model is, efficiently solves the above problem.The more function of the bistable state of the utility model
The drive system of energy electronic liquid crystal handwriting pad is powered using low-voltage dc power supply, electric by booster circuit and AC control circuit etc.
Road and the conductive electrode of exportable High Level AC Voltage electron liquid crystal handwriting pad, do not need alternating current 220V AC power supply, because
And it not only applies more convenient safety, but also can minimize, and improves product integrated level.In addition, the utility model is double
The drive system of stable state multifunction electronic liquid crystal handwriting pad is equipped with sampling feedback circuit, has the characteristics that closed loop model- following control,
It makes governor circuit that can adjust output power according to diaphragm electric parameter.In addition, the multi-functional electricity of the bistable state of the utility model
Comprehensive erasing writing person's handwriting had both may be implemented in the drive system of sub- liquid crystal handwriting pad, and selective erase written handwriting also may be implemented,
Its is easy to use, conducive to the writing experience for promoting user.The bistable state multifunction electronic liquid crystal handwriting pad of the utility model
Drive system have the characteristics that low in energy consumption, small in size, integrated level is high, safe and convenient to use, it has strong practicality, preferably
It widelys popularize.
[Detailed description of the invention]
Fig. 1 is the principles of the present invention block diagram.
Fig. 2 is the control signal flow graph of the utility model.
Fig. 3 is the circuit structure diagram of governor circuit.
Fig. 4 is the circuit structure diagram of booster circuit.
Fig. 5 is the circuit structure diagram of sampling feedback circuit.
Fig. 6 is the circuit structure diagram of AC control circuit.
Fig. 7 is the circuit structure diagram of power circuit.
Fig. 8 is the circuit structure diagram for removing control circuit.
[specific embodiment]
The following example is being explained further and supplementing to the utility model, does not constitute any limit to the utility model
System.
As shown in FIG. 1 to FIG. 8, the drive system of the bistable state multifunction electronic liquid crystal handwriting pad of the utility model includes electricity
Source circuit, AC control circuit, governor circuit, removes control circuit and sampling feedback circuit at booster circuit.
As shown in FIG. 1 to FIG. 2, the power circuit is electrically connected with the booster circuit and governor circuit, is used to provide
Low-tension supply；The booster circuit is electrically connected with the power circuit, AC control circuit, sampling feedback circuit and governor circuit
It connects, is used for energy storage boosting；The AC control circuit is electrically connected with the booster circuit and governor circuit, is used to control friendship
Flow the size of AC signal.The sampling feedback circuit is electrically connected with the governor circuit and booster circuit, is used for described
Booster circuit carries out boosting sampling, and feeds back to the governor circuit so that governor circuit adjusts the booster circuit；It is described clear
Except control circuit is for removing control, it is electrically connected with the governor circuit；The governor circuit respectively with the power circuit,
Booster circuit, AC control circuit, sampling feedback circuit and removing control circuit electrical connection, are used for booster circuit, exchange
Control circuit collection is removed control circuit and is controlled, to realize the driving of bi-stable electronic liquid crystal handwriting pad.Power circuit provides
Voltage source two-way high-voltage AC signal just can be generated after the circuits such as above-mentioned booster circuit, AC control circuit, realize
The driving of bi-stable electronic liquid crystal handwriting pad.
In addition, the removing control circuit of the utility model, which is equipped with all erasing control and selective erase, controls two kinds of control function
Can, when being chosen to be all erasing control functions, what the AC control circuit exported under the control of the governor circuit
Voltage will be above the critical voltage of liquid crystal molecule, at this point, liquid crystal molecule whole in the liquid crystal layer of liquid crystal handwriting pad is multiple by overturning
Position, wipes out written handwriting whole on liquid crystal handwriting pad to can realize；When being chosen to be selective erase control function, institute
The critical voltage that the voltage that AC control circuit exports under the control of the governor circuit is equal to liquid crystal molecule is stated, at this point, with
When family presses the part of liquid crystal handwriting pad, the liquid crystal cell thickness of corresponding site changes because of pressing, the part interior
Voltage of the critical voltage of liquid crystal molecule by reduction and lower than AC control circuit output, thus the liquid in the part
Brilliant molecule will carry out overturning reset under the voltage effect that AC control circuit exports, so as to wipe out the book of the part
It writes person's handwriting and realizes selective erase function.
No state change occurs when not by pressed by external force for the liquid crystal molecule in liquid crystal handwriting pad for the critical voltage
Maximum voltage.
If as shown in figure 3, the governor circuit at least provided with an AD sampling feedback port, a PWM output port and
Dry for providing the output control terminal mouth of output control signal.In the present embodiment, the governor circuit is by single-chip microcontroller U1 and electricity
Hold C3 composition.The single-chip microcontroller U1 is equipped with the port DGND for ground connection, the port VCC3V for connecting power supply and for providing
The port P0, the port P1, the port P4, the port P7, the port P8, the port P9, the port P10, the port RES of output control signal；It is described
The port DGND ground connection, the port VCC3V is connect with the positive electrode of the power circuit, and the port VCC3V connects through capacitor C3
Ground.
In the present embodiment, as shown in figure 4, the booster circuit includes capacitor C5, capacitor C6, inductance L1, triode Q9, electricity
Hinder R12, capacitor C2, capacitor C4, capacitor C7, resistance R3, resistance R5, resistance R6, triode Q3, triode Q4, two pole of Schottky
Pipe D1 and Schottky diode D2.The capacitor C5, capacitor C6 are in parallel, and one end ground connection, the other end is commonly connected to inductance
Between the common end of the port L1 and VCC3V；The other end of the inductance L1 then respectively with the collector of NPN type triode Q9 and
Capacitor C7 connection；The emitter of the triode Q9 is grounded, and base stage is connected through the port P10 of resistance R12 and governor circuit；Institute
The other end for stating capacitor C7 is connect with 3 feet of Schottky diode D2；1 foot of Schottky diode D2 be connected to capacitor C4 with
Between the common end of capacitor C2, the other end of capacitor C2 is grounded；2 feet of Schottky diode D2 are connected to capacitor C4 and resistance
Between the common end of R5, the other end of resistance R5 is then connect with the base stage of resistance R6 and PNP type triode Q3 respectively.Triode Q3
Emitter be connected to resistance R5 and capacitor C4 it is common end between, the collector of triode Q3 respectively with the end high-voltage output end HV
And the 2 feet connection of Schottky diode D1.1 foot of Schottky diode D1 is connected to the collector of capacitor C7 Yu triode Q9
Between, 3 feet of Schottky diode D1 are connect with 1 foot of Schottky diode D2；The other end and NPN type three of the resistance R6
The collector of pole pipe Q4 connects, and the emitter ground connection of triode Q4, base stage connects through the port P8 of resistance R3 and governor circuit
It connects.
As shown in figure 4, boosting sampling is carried out for convenience, in order to which single-chip microcontroller U1 adjusts the booster circuit, in boosting electricity
FB tie point is drawn between 3 feet of the Schottky diode D1 on road and 1 foot of Schottky diode D2, is used for anti-with sampling
Current feed circuit is attached.As shown in figure 5, the sampling feedback circuit includes resistance R4, resistance R10, resistance R13.The resistance
One end of R13 is grounded, and the other end is electrically connected with the port P7 of one end of resistance R10 and governor circuit, and the resistance R10's is another
One end is electrically connected with one end of resistance R4, and the other end of resistance R4 is electrically connected with the FB tie point of booster circuit.
As shown in Figure 4, Figure 5, the booster circuit is electrically connected with governor circuit, makes governor circuit can be according to product need
It asks and triode Q9 is controlled by the port P10 output square-wave signal, to can provide reasonable voltage to booster circuit.The boosting electricity
A part output on road is directly output to AC control circuit through Schottky diode D1, and another part passes through capacitor C7, double
Continue to store energy in the energy storage booster system formed to Schottky diode D1, D2 and capacitor C4, C2；Sampling feedback circuit is real
When acquisition booster circuit in FB tie point information of voltage to governor circuit, governor circuit according to different instructions to energy not
Same demand controls duty ratio and pulse number by P10 port output signal, exports in due course to control booster circuit, to mention
For more rationally more efficient High voltage output VH.
As shown in fig. 6, the AC control circuit acts on bi-stable electronic liquid crystal handwriting pad by output AC signal
Two set control systems composition on two conductive electrodes, the port P0, the port P1, the port P4, the end P9 with the governor circuit
The connection of the end high-voltage output end HV of mouth and booster circuit.In the present embodiment, the first set control system include PNP type triode Q5,
NPN type triode Q1, NPN type triode Q2, resistance R1, resistance R2, resistance R7, resistance R8, resistance R9, resistance R11 composition；
Second set control system include PNP type triode Q7, NPN type triode Q6, NPN type triode Q8, resistance R18, resistance R19,
Resistance R14, resistance R17, resistance R15, resistance R20.
As shown in fig. 6, the circuit structure of first set control system are as follows: the base stage of the triode Q2 is through resistance R11
It is connect with the port P1 of governor circuit, the emitter ground connection of triode Q2, collector is connect with resistance R9；Resistance R9's is another
One end is connect with the base stage of resistance R8 and triode Q5 respectively；The other end of resistance R8 then with the high-voltage output end HV of booster circuit
End connection.The emitter of triode Q5 and the end high-voltage output end HV of booster circuit connect, and the collector of triode Q5 is through electricity
Resistance R7 is connect with the first conductive electrode N of bi-stable electronic liquid crystal handwriting pad.The base stage of the triode Q1 is through resistance R2 and master
The port the P0 connection of circuit, the emitter ground connection of triode Q1 are controlled, collector is answered through resistance R1 and bi-stable electronic liquid crystal
First conductive electrode N connection of molding.
As shown in fig. 6, the circuit structure of second set control system are as follows: the base stage of the triode Q8 is through resistance R15
It is connect with the port P4 of governor circuit, the emitter ground connection of triode Q8, collector is connect with resistance R19；Resistance R19's
The other end is connect with the base stage of resistance R18 and triode Q7 respectively；The other end of resistance R18 is then defeated with the high pressure of booster circuit
The connection of the end outlet HV.The emitter of triode Q7 and the end high-voltage output end HV of booster circuit connect, the current collection of triode Q7
Pole is connect through resistance R17 with the second conductive electrode P of bi-stable electronic liquid crystal handwriting pad.The base stage of the triode Q6 is through resistance
The connection of the port P9 of R20 and governor circuit, the emitter ground connection of triode Q6, collector is through resistance R14 and bistable electro
Second conductive electrode P connection of sub- liquid-crystal composite membrane.
By above-mentioned AC control circuit, governor circuit can be according to the voltage characteristic of different product demand, respectively at the end P0
Mouth, the port P1, the port P4, the port P9 export signal driving triode Q2, Q5, Q7, Q8 of certain frequency and amplitude with defeated in real time
The pulse-shaped voltage needed out acts on two conductive electrodes of bi-stable electronic liquid-crystal composite membrane, so as to drive liquid
Liquid crystal molecule in brilliant composite membrane changes state, and the pressure sensitivity person's handwriting left when writing is eliminated with this.
As shown in fig. 7, the power circuit includes that can provide the battery of 3.0V DC voltage and be electrically connected with the battery
Positive electrode and negative electrode.In the present embodiment, the CR2016 button cell of the Selection of Battery 3.0V.It is described in other embodiments
Battery also can be selected other low pressure and be worth DC power supply, such as dry cell together.The positive electrode and the governor circuit and boosting
The port VCC3V of circuit is electrically connected, and is used to provide the operating voltage of 3V to the governor circuit and booster circuit.It is described negative
Electrode ground connection.
The removing control circuit is for removing control, to eliminate the pressure sensi-tive pen left on liquid crystal handwriting pad when writing
Mark.Since the removing control circuit has at least two control functions --- all erasing and selective erase control function, because
This, is at least provided to two kinds of control modes of operation of user.It in some embodiments, can be by the way that two function buttons be arranged
So that user operates, for example, full frame removing key and part removing key can when the full frame removing key of user's operation
To wipe whole written handwritings；When user's operation locally remove key when, can by press/scribble part and wipe
Fall local written handwriting.In some embodiments, two kinds of different operation sides of one function button of setting can also be passed through
Formula carries out the control operation of two kinds of functions for user, for example, carry out all wiping when short-press (such as 0.5S), when long-pressing (3S)
It carries out selective erase control or short-press once carries out whole erasings, short-press carries out selective erase control etc. twice.The present embodiment
In, the removing control circuit is equipped with a function button --- switch SW1, passes through the different operation mode of switch SW1
And realize two kinds of control functions described in the utility model.In the present embodiment, as shown in figure 8, one end of the switch SW1 and institute
State the port the RES electrical connection of governor circuit, the other end ground connection of switch SW1；As short-press switch SW1, the master control electricity
Road controls the AC control circuit output and is higher than the voltage of liquid crystal molecule critical voltage and makes it can comprehensive erasing writing pen
Mark；As long-pressing switch SW1, the governor circuit controls the AC control circuit output and is equal to the critical electricity of liquid crystal molecule
The voltage of pressure and make user can by press liquid crystal handwriting pad part carry out selective erase.The removing control circuit
Be supplied to user carry out operation control mode can as the case may be depending on, can be selected various ways and be not limited to this reality
Apply concrete mode described in example.
In addition, testing for convenience of when implementing entire circuit, in the present embodiment, as shown in figs. 4 and 6, in the liter
Volt circuit and AC control circuit are equipped with test point TP8, TP9, TP10.Wherein, test point TP8 setting inductance L1 with
Between the port VCC3V, test point TP9, TP10 is separately positioned on two conductive electrodes of bi-stable electronic liquid crystal handwriting pad.
When it is implemented, the governor circuit, booster circuit, AC control circuit, removing control circuit and sampling feedback
Circuit integration is set on pcb board and forms driving plate, and the bistable state for connecting with power circuit and forming the utility model is more
The drive system of function electronic liquid crystal handwriting pad.
The drive system of the bistable state multifunction electronic liquid crystal handwriting pad of the utility model have super low-power consumption and closed loop with
The characteristics of with control, can not only adjust output power according to diaphragm electric parameter, and its its no-load power consumption is ultralow, can be with
Low-voltage DC supply applies more convenient safety without alternating current 220V AC power supply.In addition, the utility model
The drive system of bistable state multifunction electronic liquid crystal handwriting pad may make the operating power consumption of liquid crystal handwriting pad and stand-by power consumption super
It is low, for example, the hand-written panel products of liquid crystal for 9.7 inches can remove 30,000 left sides using the CR2016 button cell of 3.0V
The right side generally can be used 1 to 2 years, very environment protecting and power-saving.The bistable state multifunction electronic liquid crystal handwriting pad of the utility model
Drive system have the characteristics that low in energy consumption, integrated level is high, can be widely applied to various liquid crystal handwriting pads and use this electricity
Sub- liquid crystal writes the similar products of film, such as highlights thick person's handwriting bi-stable electronic liquid crystal blackboard.
Although being disclosed by above embodiments to the utility model, the scope of the utility model is not limited to
In this, under conditions of conceiving without departing from the utility model, above each component can be understood similar with technical field personnel
Or equivalent element is replaced.
Claims (11)
1. a kind of drive system of bistable state multifunction electronic liquid crystal handwriting pad, which is characterized in that it includes power circuit, boosting
Circuit, AC control circuit, governor circuit and removing control circuit, in which:
The power circuit is electrically connected with the booster circuit and governor circuit, is used to provide low-tension supply；
The booster circuit is electrically connected with the power circuit, AC control circuit and governor circuit, is used for energy storage boosting；
The AC control circuit is electrically connected with the booster circuit and governor circuit, is used to control the output of AC signal；
The removing control circuit is electrically connected with the governor circuit, is used to remove control；
The governor circuit is electrically connected with the power circuit, booster circuit, AC control circuit and removing control circuit, is used
It removes control circuit in booster circuit, AC control circuit collection and controls, to realize bi-stable electronic liquid crystal handwriting pad
Driving.
2. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as described in claim 1, which is characterized in that it is also wrapped
Sampling feedback circuit is included, the sampling feedback circuit is electrically connected with the governor circuit and booster circuit, is used for the liter
Volt circuit carries out boosting sampling, and feeds back to the governor circuit so that governor circuit adjusts the booster circuit.
3. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as described in claim 1, which is characterized in that described clear
Except control circuit is equipped with, all erasings are controlled and selective erase controls two kinds of control functions, control function when being chosen to be all erasings
When energy, the voltage that the AC control circuit exports under the control of the governor circuit is higher than the critical voltage of liquid crystal molecule；
When being chosen to be selective erase control function, voltage that the AC control circuit exports under the control of the governor circuit
Equal to the critical voltage of liquid crystal molecule；The critical voltage be liquid crystal handwriting pad in liquid crystal molecule no state change occurs most
Big voltage.
4. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as described in claim 1, which is characterized in that the master
Control circuit at least provided with an AD sampling feedback port, a PWM output port and several for provide output control signal
Output control terminal mouth.
5. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 2, which is characterized in that the master
Control circuit includes that single-chip microcontroller U1 and capacitor C3, the single-chip microcontroller U1 are equipped with the port DGND for ground connection, for connecting power supply
The port VCC3V and for provide the output control port P0 of signal, the port P1, the port P4, the port P7, the port P8, the port P9,
The port P10, the port RES；The port the DGND ground connection, the port VCC3V are connect with the positive electrode of the power circuit, and should
The port VCC3V is grounded through capacitor C3.
6. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 5, which is characterized in that the liter
Volt circuit includes capacitor C5, capacitor C6, inductance L1, NPN type triode Q9, resistance R12, capacitor C2, capacitor C4, capacitor C7, electricity
Hinder R3, resistance R5, resistance R6, PNP type triode Q3, NPN type triode Q4, Schottky diode D1 and Schottky diode
D2；The capacitor C5, capacitor C6 are in parallel, and one end ground connection, the other end is commonly connected to the common of the port inductance L1 and VCC3V
Between end；The other end of the inductance L1 is then connect with the collector of triode Q9 and capacitor C7 respectively；The triode Q9's
Emitter ground connection, base stage are connected through the port P10 of resistance R12 and governor circuit；The other end and Schottky of the capacitor C7
3 feet of diode D2 connect；1 foot of Schottky diode D2 is connected between the common end of capacitor C4 and capacitor C2, capacitor
The other end of C2 is grounded；2 feet of Schottky diode D2 are connected between the common end of capacitor C4 and resistance R5, resistance R5's
The other end is then connect with the base stage of resistance R6 and triode Q3 respectively；The emitter of triode Q3 is connected to resistance R5 and capacitor
Between the common end of C4, the collector of triode Q3 is connect with 2 feet of the end high-voltage output end HV and Schottky diode D1 respectively；
1 foot of Schottky diode D1 is connected between capacitor C7 and the collector of triode Q9,3 feet of Schottky diode D1 with
1 foot of Schottky diode D2 connects；The other end of the resistance R6 is connect with the collector of triode Q4, triode Q4's
Emitter ground connection, base stage are connected through the port P8 of resistance R3 and governor circuit；3 feet and Xiao in the Schottky diode D1
The FB tie point for connecting the sampling feedback circuit is equipped between 1 foot of special based diode D2.
7. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 6, which is characterized in that the friendship
Flow control circuit includes the two groups of controls for exporting AC signal and acting on two conductive electrodes of bi-stable electronic liquid crystal handwriting pad
The end the high-voltage output end HV connection of the port P0 of system processed, the first set control system and governor circuit, the port P1 and booster circuit；
The end high-voltage output end HV of the port P4 of second set control system and governor circuit, the port P9 and booster circuit connects.
8. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 7, which is characterized in that described
One set control system includes PNP type triode Q5, NPN type triode Q1, NPN type triode Q2, resistance R1, resistance R2, resistance
R7, resistance R8, resistance R9, resistance R11；The base stage of the triode Q2 is connected through the port P1 of resistance R11 and governor circuit, should
The emitter of triode Q2 is grounded, and collector is connect with resistance R9；The other end of resistance R9 respectively with resistance R8 and triode
The base stage of Q5 connects；The other end of resistance R8 is then connect with the end high-voltage output end HV of booster circuit；The emitter of triode Q5
It is connect with the end high-voltage output end HV of booster circuit, the collector of triode Q5 is hand-written through resistance R7 and bi-stable electronic liquid crystal
First conductive electrode N connection of plate；The base stage of the triode Q1 is connected through the port P0 of resistance R2 and governor circuit, three pole
The emitter of pipe Q1 is grounded, and collector is connect through resistance R1 with the first conductive electrode N of bi-stable electronic liquid crystal handwriting pad.
9. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 7, which is characterized in that described
Two set control systems include PNP type triode Q7, NPN type triode Q6, NPN type triode Q8, resistance R18, resistance R19, electricity
Hinder R14, resistance R17, resistance R15, resistance R20；The base stage of the triode Q8 connects through the port P4 of resistance R15 and governor circuit
It connects, the emitter ground connection of triode Q8, collector is connect with resistance R19；The other end of resistance R19 respectively with resistance R18
And the base stage connection of triode Q7；The other end of resistance R18 is then connect with the end high-voltage output end HV of booster circuit；Triode Q7
Emitter and booster circuit the end high-voltage output end HV connect, the collector of triode Q7 is through resistance R17 and bistable electro
Second conductive electrode P connection of sub- liquid crystal handwriting pad；P9 port of the base stage of the triode Q6 through resistance R20 and governor circuit
Connection, the emitter ground connection of triode Q6, collector second through resistance R14 and bi-stable electronic liquid crystal handwriting pad are conductive
Electrode P connection.
10. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as claimed in claim 6, which is characterized in that described
Sampling feedback circuit includes one end ground connection of resistance R4, resistance R10, resistance R13, the resistance R13, the other end and resistance
One end of R10 and the port the P7 electrical connection of governor circuit, the other end of the resistance R10 are electrically connected with one end of resistance R4, electricity
The other end of resistance R4 is electrically connected with the FB tie point of booster circuit.
11. the drive system of bistable state multifunction electronic liquid crystal handwriting pad as described in claim 1, which is characterized in that described
Power circuit includes the positive electrode and negative electrode that can provide the battery of 3.0V DC voltage and be electrically connected with the battery, the positive electricity
Pole is electrically connected with the governor circuit and booster circuit, the negative electrode ground connection；The removing control circuit includes switch SW1,
One end of the switch SW1 is electrically connected with the port RES of the governor circuit, the other end ground connection of the switch SW1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703527A (en) * | 2019-09-04 | 2020-01-17 | 陈华丰 | Liquid crystal display device and erasing method thereof |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703527A (en) * | 2019-09-04 | 2020-01-17 | 陈华丰 | Liquid crystal display device and erasing method thereof |
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Effective date of registration: 20190411 Address after: 518100 Building 1701, Building 9 A, Furong Road, Tantou Community, Songgang Street, Baoan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Bao Li Chuang Technology Co., Ltd. Address before: 510000 Building 1701, Building 9 A, Furong Road, Tantou Community, Songgang Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: Wu Fei |