CN208432968U - It is a kind of can selective erase handwriting device and writing pencil - Google Patents
It is a kind of can selective erase handwriting device and writing pencil Download PDFInfo
- Publication number
- CN208432968U CN208432968U CN201821170684.XU CN201821170684U CN208432968U CN 208432968 U CN208432968 U CN 208432968U CN 201821170684 U CN201821170684 U CN 201821170684U CN 208432968 U CN208432968 U CN 208432968U
- Authority
- CN
- China
- Prior art keywords
- switch
- voltage
- unit
- liquid crystal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses it is a kind of can selective erase handwriting device and writing pencil, handwriting device connect and is used cooperatively by conducting wire with writing pencil, and for writing pencil equipped with first switch, handwriting device includes second switch, liquid crystal handwriting screen and driving circuit.Two output ends of liquid crystal handwriting screen two electrodes of extraction, two electrodes and driving circuit are separately connected, and first switch and the second switch is connect with two input terminals of driving circuit respectively.First switch control driving circuit exports first voltage to liquid crystal handwriting screen, and second switch control driving circuit exports second voltage to liquid crystal handwriting screen, for the global erasing mode and local erasing mode of switchable liquid crystal handwriting screen.The utility model solve existing handwriting device can only a key wiping, the problem of cannot locally wiping.
Description
Technical field
The utility model belongs to LCD Controlling technical field, more particularly to it is a kind of can selective erase handwriting device and hand
Write pen.
Background technique
Existing bistable liquid crystal handwriting pad has extremely low power consumption, does not need consumptive material, there is a key erasing function, use is non-
It is often convenient, but for handwritten content error or when modifying, it modifies, can only carry out complete after selective erase cannot being carried out to handwritten content
Portion's erasing is write from the beginning again, seriously affects efficiency.
Utility model content
The utility model embodiment provide it is a kind of can selective erase handwriting device and writing pencil, to solve existing skill
The problem of handwritten content on liquid crystal display cannot being carried out selective erase in art, influence service efficiency.
The first aspect of the utility model embodiment provide it is a kind of can selective erase handwriting device, pass through with writing pencil
Conducting wire connection, writing pencil are equipped with first switch, and handwriting device includes second switch, liquid crystal handwriting screen and driving circuit.
Two output ends of liquid crystal handwriting screen two electrodes of extraction, two electrodes and driving circuit connect one to one, the
One switch and second switch connect one to one with two input terminals of driving circuit respectively.
First switch control driving circuit exports first voltage to liquid crystal handwriting screen, and second switch controls driving circuit output
Second voltage is to liquid crystal handwriting screen, for the global erasing mode and local erasing mode of switchable liquid crystal handwriting screen.
In one embodiment, first switch includes voltage-controlled touch-switch.
In one embodiment, touch-switch is arranged in the wiping head of non-writing one end of writing pencil, wiping head pressing
When on liquid crystal handwriting screen, touch-switch compression movement.
In one embodiment, first switch includes the first one-way conduction unit and first switch unit.
The first output end and second output terminal of first one-way conduction unit be respectively first switch the first output end and
Second output terminal, the power supply of the first one-way conduction unit terminate the first direct current, the ground termination first of the first one-way conduction unit
The first end of switch unit, the second end ground connection of first switch unit.
In one embodiment, second switch includes the key switch being arranged on handwriting device.
In one embodiment, second switch includes the second one-way conduction unit and second switch unit.
The first output end and second output terminal of second one-way conduction unit be respectively second switch the first output end and
Second output terminal, the power supply of the second one-way conduction unit terminate the first direct current, the ground termination second of the second one-way conduction unit
The first end of switch unit, the second end ground connection of second switch unit.
In one embodiment, driving circuit includes main control module and ac pulse voltage drive module.
First output end of the first mode selection input termination first switch of main control module, the second mode of main control module
The second output terminal of first output end of selection input termination second switch, the second output terminal of first switch and second switch with
First start end of ac pulse voltage drive module connects altogether, and the pulse control output end of main control module powers on output end and again
Open output end respectively with the pulse control input terminal of ac pulse voltage drive module, the second start end and restart input terminal one by one
It is correspondingly connected with, the positive and negative voltage output end of ac pulse voltage drive module connects two electrodes of liquid crystal handwriting screen respectively.
In one embodiment, ac pulse voltage drive module includes voltage regulation unit and pole unit.
First start end of voltage regulation unit, the second start end, pulse control input terminal and restart input terminal respectively with
First start end of ac pulse voltage drive module, the second start end, pulse control input terminal and to restart input terminal one a pair of
Answer, the voltage output of voltage regulation unit termination falls the voltage input end of pole unit, the first controlled end of falling pole of pole unit and
Second controlled end of falling pole connects one to one with the first control terminal of falling pole of main control module and the second control terminal of falling pole respectively.
Voltage regulation unit exports DC voltage to pole unit, and pole unit is under the control of main control module by direct current
Pressure is converted to ac pulse voltage and exports ac pulse voltage to liquid crystal handwriting screen.
In one embodiment, pole unit includes that the first switch control subelement of symmetrical configuration and second switch control
Subelement.
The input terminal of first switch control subelement and second switch control subelement connects DC voltage, first switch control altogether
The output end of subunit and second switch control subelement connects two electrodes of liquid crystal handwriting screen respectively.
The second aspect of the utility model embodiment provides a kind of writing pencil as described above, for it is as described above
Can the handwriting device of selective erase connect and be used cooperatively by conducting wire.
Existing beneficial effect is the utility model embodiment compared with prior art: by the first switch in writing pencil
Control driving circuit exports first voltage to liquid crystal handwriting screen, controls driving circuit output by the second switch on handwriting device
Second voltage is to liquid crystal handwriting screen, for the global erasing mode and local erasing mode of switchable liquid crystal handwriting screen.It solves existing
Have handwriting device can only a key wiping, the problem of cannot locally wiping.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the signal schematic representation for driving bistable liquid crystal handwriting screen；
Fig. 2 is the structural schematic diagram of handwriting device and writing pencil provided by one embodiment of the utility model；
Fig. 3 is the modular structure schematic diagram of handwriting device and writing pencil provided by one embodiment of the utility model；
Fig. 4 is the electrical block diagram of first switch in Fig. 3；
Fig. 5 is the electrical block diagram of second switch in Fig. 3；
Fig. 6 is the signal flow schematic diagram of main control module in Fig. 3；
Fig. 7 is the electrical block diagram of voltage regulation unit；
Fig. 8 is down the electrical block diagram of pole unit.
Specific embodiment
In order to make those skilled in the art more fully understand this programme, below in conjunction with attached in this programme embodiment
Figure, is explicitly described the technical solution in this programme embodiment, it is clear that described embodiment is this programme a part
Embodiment, instead of all the embodiments.Based on the embodiment in this programme, those of ordinary skill in the art are not being made
The range of this programme protection all should belong in every other embodiment obtained under the premise of creative work.
The specification and claims of this programme and term " includes " and other any deformations in above-mentioned attached drawing are
Refer to " including but not limited to ", it is intended that covering non-exclusive includes the example for being not limited in enumerating in text.In addition, term
" first " and " second " etc. are for distinguishing different objects, not for description particular order.
Firstly, it is necessary to explanation, the working principle of bistable liquid crystal handwriting screen are as follows: using the characteristic of bistable liquid crystal,
When there is pressure to be able to record track when acting on liquid crystal screen surfaces, and the thickness of track lines is determined by writing pressure, pressure
Bigger, the liquid crystal to twist is more, and writing line is thicker.Under driving in certain voltage waveform, bistable liquid crystal hand
Screen is write to return to original state.
The selective erase principle of bistable liquid crystal handwriting screen are as follows: according to the working principle of bistable liquid crystal, when to liquid crystal hand
It writes screen and connects specific ac pulse voltage (as shown in Figure 1), so that liquid crystal molecule is in the critical shape that will overturn in shielding
State (infinite approach rollover states), but overturning is had not occurred, at this point, causing to be pressed local location when there is external pressure pressing
Liquid crystal plate thickness change, so that the liquid crystal molecule of local location is flipped, realize the function of selective erase.
The specific implementation of the utility model is described in detail below in conjunction with specific attached drawing.
Embodiment 1:
Fig. 2 to Fig. 8 show one kind provided by the embodiments of the present invention can selective erase handwriting device knot
Structure illustrates only part relevant to the utility model embodiment, details are as follows for ease of description.
As shown in Fig. 2, in one embodiment of the utility model, can selective erase handwriting device, it is logical with writing pencil
Conducting wire connection is crossed, writing pencil is equipped with first switch 100, and handwriting device includes second switch 200, liquid crystal handwriting screen 300 and drives
Dynamic circuit 400.
As shown in figure 3, liquid crystal handwriting screen 300 draws two electrodes, two output ends of two electrodes and driving circuit 400
It connects one to one, first switch 100 and second switch 200 correspond with two input terminals of driving circuit 400 connect respectively
It connects.
First switch 100 controls driving circuit 400 and exports first voltage to liquid crystal handwriting screen 300, and second switch 200 controls
Driving circuit 400 exports second voltage to liquid crystal handwriting screen 300, for switchable liquid crystal handwriting screen 300 global erasing mode and
Selective erase mode.
In the present embodiment, the first voltage and second voltage that driving circuit 400 provides are for realizing liquid crystal handwriting screen 300
The conversion of global erasing mode and local erasing mode.Driving circuit 400 cannot export first voltage and second voltage simultaneously.
In one embodiment, first switch 100 acts (being turned on or off), exports first mode selection signal CLE_
For KEY to driving circuit 400, driving circuit 400 exports first voltage, and liquid crystal handwriting screen 300 enters selective erase mode, and cooperation exists
Pressure on liquid crystal handwriting screen 300, the writing of erasable pressure site.
Second switch 200 acts (being turned on or off), output second mode selection signal PWR_KEY to driving circuit 400,
Driving circuit 400 exports second voltage, and liquid crystal handwriting screen 300 enters global erasing mode, can be by the word in liquid crystal handwriting screen 300
Mark is all wiped.
The utility model embodiment provide it is a kind of can selective erase handwriting device, solving existing handwriting device can only
One key wiping, the problem of cannot locally wiping.
In one embodiment of the utility model, first switch 100 includes voltage-controlled touch-switch SW1.Such as Fig. 2 institute
Show, touch-switch SW1 is arranged in the wiping head of non-writing one end of writing pencil.
In the present embodiment, when on liquid crystal handwriting screen 300, touch-switch SW1 compression acts and exports for wiping head pressing
For one mode select signal CLE_KEY to driving circuit 400, driving circuit 400 exports first voltage to liquid crystal handwriting screen 300.
In one embodiment, it when touch-switch SW1 compression movement (closure or disconnection), is controlled by driving circuit 400
Liquid crystal handwriting screen 300 processed enters selective erase mode, the writing of erasable pressure site.
In the present embodiment, one of writing pencil is arranged in wiping head, when user is pressed using wiping head in liquid crystal handwriting screen
When on 300, touch-switch SW1 movement is wiped at this point, driving circuit 400, which controls liquid crystal handwriting screen 300, enters selective erase mode
The content of institute's contact position can be wiped by wiping head, realize the usage mode and function of similar rubber.And in local wiping
Additional other operations are not needed using wiping head wiping in the process, it appears naturally and conveniently, and writing pencil passes through with handwriting device
The case where conducting wire connects together, and effectively writing pencil is avoided to lose.
As shown in figure 4, first switch 100 includes the first one-way conduction unit in one embodiment of the utility model
110 and first switch unit 120.
The first output end and second output terminal of first one-way conduction unit 110 are respectively the first defeated of first switch 100
The power supply of outlet and second output terminal, the first one-way conduction unit 110 terminates the first direct current VDD_3V, the first one-way conduction list
The first end of the ground termination first switch unit 120 of member 110, the second end ground connection of first switch unit 120.
As shown in figure 4, the first output end of the first one-way conduction unit 110 exports enabling signal POWER_EN to driving electricity
The second output terminal on road 400, the first one-way conduction unit 110 exports first mode selection signal CLE_KEY.
As shown in figure 4, the first one-way conduction unit 110 includes first diode D1, the second diode D2 and resistance R1.
The anode of first diode D1 is the first output end of the first one-way conduction unit 110, the sun of the second diode D2
The first end of pole and resistance R1 connect the second output terminal to form the first one-way conduction unit 110, the cathode of first diode D1 altogether
Connect the ground terminal to form the first one-way conduction unit 110 altogether with the cathode of the second diode D2.
As shown in figure 4, first switch unit 120 includes touch-switch SW1.
As shown in Figure 1, second switch 200 includes being arranged on handwriting device in one embodiment of the utility model
Key switch SW2.
Key switch SW2 is pressed, and liquid crystal handwriting screen 300 enters global erasing mode.
As shown in figure 5, second switch 200 includes the second one-way conduction unit 210 and second switch unit 220.
The first output end and second output terminal of second one-way conduction unit 210 are respectively the first defeated of second switch 200
The power supply of outlet and second output terminal, the second one-way conduction unit 210 terminates the first direct current VDD_3V, the second one-way conduction list
The first end of the ground termination second switch unit 220 of member 210, the second end ground connection of second switch unit 220.
As shown in figure 5, the first output end of the second one-way conduction unit 210 exports enabling signal POWER_EN to driving electricity
The second output terminal on road 400, the second one-way conduction unit 210 exports second mode selection signal PWR_KEY.
As shown in figure 5, the second one-way conduction unit 210 includes third diode D3, the 4th diode D4 and resistance R2.
The anode of third diode D3 is the first output end of the second one-way conduction unit 210, the sun of the 4th diode D4
The first end of pole and resistance R2 connect the second output terminal to form the second one-way conduction unit 210, the cathode of third diode D3 altogether
Connect the ground terminal to form the second one-way conduction unit 210 altogether with the cathode of the 4th diode D4.
As shown in figure 5, second switch unit 220 includes key switch SW2.
As shown in figure 3, in one embodiment of the utility model, driving circuit 400 includes main control module 410 and exchange
Pulse voltage drive module 420.
First output end of the first mode selection input termination first switch 100 of main control module 410, main control module 410
Second mode selection input termination second switch 200 the first output end, the second output terminal of first switch 100 and second opens
The first start end for closing 200 second output terminal and ac pulse voltage drive module 420 connects altogether, the pulse of main control module 410
Control output end, power on output end and restart output end respectively with the pulse control of ac pulse voltage drive module 420 input
End, the second start end and restarts input terminal and connect one to one, the positive and negative voltage output of ac pulse voltage drive module 420
End connects two electrodes of liquid crystal handwriting screen 300 respectively.
As shown in fig. 6, each port transmission signal of main control module 410 is as follows:
First mode selects input terminal to access first mode selection signal CLE_KEY,
Second mode selects input terminal to access second mode selection signal PWR_KEY,
Pulse control output end exports pulse control signal PWM_EN,
Output end output power on signal PWR_EN is powered on,
Restart output end output Restart Signal RES_EN,
First control terminal of falling pole exports the first signal of falling pole PWM_L,
Second control terminal of falling pole exports the second signal of falling pole PWM_R.
In one embodiment, main control module 410 includes STM32L011F4 main control chip.
As shown in Figure 7 and Figure 8, ac pulse voltage drive module 420 includes voltage regulation unit 421 and pole unit
422。
First start end of voltage regulation unit 421, the second start end, pulse control input terminal and restart input terminal difference
With the first start end of ac pulse voltage drive module 420, the second start end, pulse control input terminal and restart input terminal one
One is corresponding, and the voltage output of voltage regulation unit 421 terminates the voltage input end of pole unit 422, the first of pole unit 422
The controlled end of falling pole and the second controlled end of falling pole respectively with the first control terminal of falling pole of main control module 410 and the second control terminal of falling pole one
One is correspondingly connected with.
Voltage regulation unit 421 exports DC voltage VCC to pole unit 422, and pole unit 422 is in main control module 410
Control under DC voltage VCC be converted into ac pulse voltage and export ac pulse voltage to liquid crystal handwriting screen 300.
As shown in fig. 7, each port transmission signal of voltage regulation unit 421 is as follows:
First start end accesses enabling signal POWER_EN,
Second start end accesses power on signal PWR_EN,
Pulse control input terminal accesses pulse control signal PWM_EN,
Restart input terminal access Restart Signal RES_EN,
Voltage output end exports DC voltage VCC.
In the present embodiment, the pulse control signal PWM_EN that voltage regulation unit 421 is exported according to main control module 410 is adjusted
The voltage value of the DC voltage VCC of its output is saved, including first voltage and second presses.
As shown in fig. 7, voltage regulation unit 421 includes the booster converter U1 of model KTD2598.
As shown in figure 8, each port transmission signal of pole unit 422 is as follows:
Voltage input end accesses DC voltage VCC,
First controlled end of falling pole accesses the first signal of falling pole PWM_L,
Second controlled end of falling pole accesses the second signal of falling pole PWM_R,
First output end exports first electrode voltage V1,
Second output terminal exports second electrode voltage V2.
First electrode voltage V1 and second electrode voltage V2 forms ac pulse voltage.
As shown in figure 8, pole unit 422 includes first switch control subelement 4221 and the second switch control of symmetrical configuration
Subunit 4222.
The input terminal of first switch control subelement 4221 and second switch control subelement 4222 connects DC voltage altogether
The output end of VCC, first switch control subelement 4221 and second switch control subelement 4222 connects liquid crystal handwriting screen 300 respectively
Two electrodes.
As shown in figure 8, when the input terminal and output end of first switch control subelement 4221 are connected, second switch control
The output end of unit 4222 is grounded, i.e. first electrode voltage V1 is equal to VCC, and second electrode voltage V2 is zero.Second switch control
When input terminal and the output end conducting of subelement 4222, first switch controls the output end ground connection of subelement 4221, i.e., the second electricity
Pole tension V2 is equal to VCC, and first electrode voltage V1 is zero.
In the present embodiment, by fall pole unit 422 realize liquid crystal handwriting screen 300 two electrodes positive counter voltage hand over
It replaces.Pole unit 422 accesses the DC voltage VCC that voltage regulation unit 421 exports, and first exported in main control module 410
Under the control of the signal of falling pole PWM_L and the second signal of falling pole PWM_R, the first electrode voltage V1 and second electrode of its output are realized
The voltage positive and negative alternate of voltage V2.
Embodiment 2:
The embodiments of the present invention 2 provide a kind of writing pencil as described above, for as described above can be local
The handwriting device of erasing is connected and is used cooperatively by conducting wire.
In the embodiments of the present invention, a touch-switch is equipped in the wiping head of writing pencil, touch-switch passes through
Conducting wire is connect with the main control module in handwriting device, and usual touch-switch is in an off state.
The work of this programme and use process include:
When content of the user using wiping head erasing handwriting area, touch-switch, which is pressurized, to be closed, at this time main control module base
In pulse width modulation principle control ac pulse voltage drive module output first voltage (ac pulse voltage), liquid crystal is hand-written
Screen is switched to selective erase mode, and the content of wiping the wiped position of head is rubbed off.
When user lifts wiping head, erasing terminates.
When user presses the button switch, main control module controls ac pulse voltage drive module and exports second voltage, liquid crystal
Handwriting screen is switched to global erasing mode, and the full content on screen is wiped free of.
Designed by this programme, solve existing handwriting device can only a key wiping, the problem of cannot locally wiping, and
Do not need additional other operations using wiping head wiping in local wiping process, it appears it is natural and conveniently, and writing pencil with it is hand-written
The case where device is connected together by conducting wire, effectively writing pencil is avoided to lose.
The above, above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. one kind can selective erase handwriting device, which is characterized in that connect with writing pencil by conducting wire, set on the writing pencil
There is first switch, the handwriting device includes second switch, liquid crystal handwriting screen and driving circuit；
The liquid crystal handwriting screen draws two electrodes, two output ends one-to-one correspondence of described two electrodes and the driving circuit
Connection, the first switch and the second switch connect one to one with two input terminals of the driving circuit respectively；
The first switch controls the driving circuit and exports first voltage to the liquid crystal handwriting screen, the second switch control
The driving circuit exports second voltage to the liquid crystal handwriting screen, for switching the global erasing mode of the liquid crystal handwriting screen
With local erasing mode.
2. as described in claim 1 can selective erase handwriting device, which is characterized in that the first switch includes voltage-controlled
Touch-switch.
3. as claimed in claim 2 can selective erase handwriting device, which is characterized in that the touch-switch is arranged described
In the wiping head of non-writing one end of writing pencil, the wiping head pressing is when on the liquid crystal handwriting screen, the touch-switch
Compression movement.
4. as described in claim 1 can selective erase handwriting device, which is characterized in that the first switch includes first single
To onunit and first switch unit；
The first output end and second output terminal of the first one-way conduction unit are respectively the first output of the first switch
The power supply of end and second output terminal, the first one-way conduction unit terminates the first direct current, the first one-way conduction unit
Ground terminate the first end of the first switch unit, the second end ground connection of the first switch unit.
5. as described in claim 1 can selective erase handwriting device, which is characterized in that the second switch include setting exist
Key switch on the handwriting device.
6. as described in claim 1 can selective erase handwriting device, which is characterized in that the second switch includes second single
To onunit and second switch unit；
The first output end and second output terminal of the second one-way conduction unit are respectively the first output of the second switch
The power supply of end and second output terminal, the second one-way conduction unit terminates the first direct current, the second one-way conduction unit
Ground terminate the first end of the second switch unit, the second end ground connection of the second switch unit.
7. as it is as claimed in any one of claims 1 to 6 can selective erase handwriting device, which is characterized in that the driving circuit
Including main control module and ac pulse voltage drive module；
The first mode selection input of the main control module terminates the first output end of the first switch, the main control module
Second mode selection input terminates the first output end of the second switch, the second output terminal of the first switch and described the
First start end of the second output terminal and the ac pulse voltage drive module of two switches connects altogether, the arteries and veins of the main control module
Control output end is rushed, output end is powered on and restarts output end is defeated with the pulse control of the ac pulse voltage drive module respectively
Enter end, the second start end and restart input terminal to connect one to one, the positive and negative voltage of the ac pulse voltage drive module is defeated
Outlet connects two electrodes of the liquid crystal handwriting screen respectively.
8. as claimed in claim 7 can selective erase handwriting device, which is characterized in that the ac pulse voltage drives mould
Block includes voltage regulation unit and pole unit；
First start end of the voltage regulation unit, the second start end, pulse control input terminal and restart input terminal respectively with
First start end of the ac pulse voltage drive module, the second start end, pulse control input terminal and restart input terminal one
One is corresponding, the voltage input end of the voltage output termination of the voltage regulation unit pole unit, the pole unit
First controlled end of falling pole and the second controlled end of falling pole respectively with the first control terminal of falling pole of the main control module and the second control of falling pole
End processed connects one to one；
The voltage regulation unit exports DC voltage to the pole unit, the control of the pole unit in the main control module
The DC voltage is converted into ac pulse voltage under system and exports the ac pulse voltage to the liquid crystal handwriting screen.
9. as claimed in claim 8 can selective erase handwriting device, which is characterized in that it is described fall pole unit include structure pair
The first switch control subelement and second switch of title control subelement；
The input terminal of the first switch control subelement and second switch control subelement meets the DC voltage, institute altogether
The output end for stating first switch control subelement and second switch control subelement connects the two of the liquid crystal handwriting screen respectively
A electrode.
10. a kind of writing pencil as described in any one of claim 1 to 9, which is characterized in that with any one of such as claim 1 to 9
It is described can the handwriting device of selective erase connect and be used cooperatively by conducting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821170684.XU CN208432968U (en) | 2018-07-23 | 2018-07-23 | It is a kind of can selective erase handwriting device and writing pencil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821170684.XU CN208432968U (en) | 2018-07-23 | 2018-07-23 | It is a kind of can selective erase handwriting device and writing pencil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208432968U true CN208432968U (en) | 2019-01-25 |
Family
ID=65096958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821170684.XU Expired - Fee Related CN208432968U (en) | 2018-07-23 | 2018-07-23 | It is a kind of can selective erase handwriting device and writing pencil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208432968U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597259A (en) * | 2019-01-30 | 2019-04-09 | 深圳市恒开源电子有限公司 | Can selective erase liquid crystal handwriting pad and erasing apparatus |
| CN110151433A (en) * | 2019-07-03 | 2019-08-23 | 河南省中医院（河南中医药大学第二附属医院） | Special bedside card for ICU hospital bed |
| WO2022110856A1 (en) * | 2020-11-30 | 2022-06-02 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing apparatus and method for realizing local erasure by means of light irradiation |
-
2018
- 2018-07-23 CN CN201821170684.XU patent/CN208432968U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597259A (en) * | 2019-01-30 | 2019-04-09 | 深圳市恒开源电子有限公司 | Can selective erase liquid crystal handwriting pad and erasing apparatus |
| CN110151433A (en) * | 2019-07-03 | 2019-08-23 | 河南省中医院（河南中医药大学第二附属医院） | Special bedside card for ICU hospital bed |
| CN110151433B (en) * | 2019-07-03 | 2020-10-30 | 河南省中医院（河南中医药大学第二附属医院） | Special bedside card for ICU hospital bed |
| WO2022110856A1 (en) * | 2020-11-30 | 2022-06-02 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing apparatus and method for realizing local erasure by means of light irradiation |
| GB2616819A (en) * | 2020-11-30 | 2023-09-27 | Shandong Lanbeisite Educational Equipment Group | Liquid crystal writing apparatus and method for realizing local erasure by means of light irradiation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208432968U (en) | It is a kind of can selective erase handwriting device and writing pencil | |
| CN214151308U (en) | Bistable liquid crystal writing device, electronic schoolbag, liquid crystal large screen and intelligent classroom | |
| CN107728398A (en) | Liquid crystal board system and its method for deleting | |
| CN109597259A (en) | Can selective erase liquid crystal handwriting pad and erasing apparatus | |
| CN206497439U (en) | A kind of handwritten Chinese character is quickly recognized and input instrument | |
| CN206805498U (en) | A kind of hand-written LCDs writing erasing circuit | |
| CN209821567U (en) | Liquid crystal writing pad capable of being partially erased and erasing equipment | |
| CN208739094U (en) | Trigger-type low power consumption switch circuit | |
| CN202221523U (en) | One-key switch device and host and screen split type device | |
| CN208622411U (en) | The drive system of bistable state multifunction electronic liquid crystal handwriting pad | |
| CN204066047U (en) | A kind of liquid crystal handwriting screen | |
| CN204557997U (en) | Photoelectricity drawing board | |
| CN211015438U (en) | Intelligent clearing control circuit and writing panel adopting same | |
| CN207424833U (en) | A kind of handwriting device and liquid crystal handwriting board device | |
| CN2566275Y (en) | All intelligent digital multimeter | |
| CN213024355U (en) | Human-computer interaction type switch touch display structure | |
| CN209803742U (en) | liquid crystal screen handwriting board with local erasable function | |
| CN209133203U (en) | A kind of liquid crystal display drive circuit and electronic writing terminal | |
| CN2615743Y (en) | PS/2 keyboard with energy-saving and high driving capacity selection | |
| CN215871352U (en) | Wide-range input low-power-consumption switching circuit | |
| CN207529637U (en) | A kind of fast refresh system and device for inhibiting ink splitting | |
| CN217113005U (en) | Erasable magnetic electronic paper display board | |
| CN215833884U (en) | One-key erasing electronic handwriting drawing board circuit and electronic handwriting drawing board | |
| CN208522835U (en) | A kind of electricity saving of mobile terminal circuit | |
| CN211653434U (en) | Temperature controller combining keys and liquid crystal screen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190125 Termination date: 20200723 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |