CN114153322A - Method for erasing liquid crystal handwriting board by single pulse with adjustable voltage and adjustable pulse width - Google Patents
Method for erasing liquid crystal handwriting board by single pulse with adjustable voltage and adjustable pulse width Download PDFInfo
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- CN114153322A CN114153322A CN202010934348.3A CN202010934348A CN114153322A CN 114153322 A CN114153322 A CN 114153322A CN 202010934348 A CN202010934348 A CN 202010934348A CN 114153322 A CN114153322 A CN 114153322A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 27
- 238000012827 research and development Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000006978 adaptation Effects 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width, which comprises the following steps: the integrated positive and negative single pulse alternating output technology comprises the following steps of: u1 is an integrated circuit, has boosting and key identification functions, is powered by a 3V button battery, and a boosting circuit is formed by a peripheral inductor L1 and a diode D1; the output end of the operation key alternately generates positive and negative monopulse signals according to the sequence of the operation key; aiming at the requirement that the erasing voltage value and the pulse width of the liquid crystal handwriting board are required to be adjusted when liquid crystal diaphragms of different manufacturers are adopted, the invention realizes a convenient and quick adaptation mode, shortens the research and development time and the production lead-in time, optimizes the management and control of a supply chain and saves the enterprise management cost.
Description
Technical Field
The invention belongs to the technical field related to electronic information and terminal technology, and particularly relates to a method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width.
Background
The liquid crystal handwriting board has wide application in the teaching and office fields, and is deeply loved by users due to the two advantages of environmental protection and eye protection. The existing liquid crystal screen handwriting board realizes the writing (drawing) through the reflection of light rays at the indentation and can be erased by one key.
The one-key erasing is realized by applying pulse voltage of certain magnitude of voltage and pulse width at two pole points of the liquid crystal membrane, easy realization and volume production, most liquid crystal handwriting boards realize erasing through the pulse of positive and negative enough pulse width and voltage at present, guarantee the uniformity of the clean degree of erasing of batch operation, the demand that the actual membrane of far above of general handwriting board product pulse width and voltage setting erased, can lead to having the scintillation and erasing the time overlength in the membrane is erased like this, can't write in 2~3 seconds after erasing, user experience is relatively poor. The long time of ultra-high pressure to pressurize the liquid crystal membrane also causes local breakdown of the membrane to form a dead spot.
When a plurality of liquid crystal film suppliers supply liquid crystal films simultaneously, the design of a driving board is required to be changed according to different parameters of the liquid crystal films of different manufacturers, so that great trouble is caused to the whole production management.
Disclosure of Invention
The invention aims to provide a method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width, which aims to solve the problem that when a plurality of liquid crystal film suppliers supply liquid crystal films simultaneously, the design of a driving board is required to be changed according to different parameters of the liquid crystal films of different manufacturers, which is provided in the background art, and causes great trouble to the whole production management.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width comprises the following steps: an integrated positive and negative single pulse alternative output technology, an integrated positive and negative single pulse alternative output technology and a pulse width adjustable technology,
the integrated positive and negative single pulse alternating output technology comprises the following steps: u1 is an integrated circuit, has boosting and key identification functions, is powered by a 3V button battery, and a boosting circuit is formed by a peripheral inductor L1 and a diode D1; the output end of the operation key alternately generates positive and negative monopulse signals according to the sequence of the operation key;
the pulse width adjustable technology comprises the following steps: r1 at the VSET pin is used to set the amplitude V of the pulse voltage, which is calculated as follows: v = (R1+40K)/10K, wherein 40K and 10K are fixed values, the fixed value can obtain a required voltage amplitude V by adjusting the value of R1 according to voltage offset and amplification factor inside the chip, and an optimal value can be debugged by using an adjustable resistor in a research and development test stage;
the pulse width adjustable technology comprises the following steps: r2 at the TSET pin is used to set the pulse width T, and is calculated as follows: t = R2/10K +22ms, 10K and 22ms are fixed values, the fixed value is determined according to the parameters of an amplifying loop and the pulse trigger bias time in the chip, the value of R2 is adjusted to obtain the required pulse width T, and an optimal value can be debugged by using an adjustable resistor in the research and development test stage;
the integrated positive and negative single pulse alternate output technology, the integrated positive and negative single pulse alternate output technology and the pulse width adjustable technology are combined, so that the method for erasing the liquid crystal handwriting board by the single pulse with adjustable voltage and adjustable pulse width is realized.
Compared with the prior art, the invention provides a method for erasing a liquid crystal handwriting board by using a single pulse with adjustable voltage and adjustable pulse width, which has the following beneficial effects:
aiming at the requirement that the erasing voltage value and the pulse width of the liquid crystal handwriting board are required to be adjusted when liquid crystal diaphragms of different manufacturers are adopted, the invention realizes a convenient and quick adaptation mode, shortens the research and development time and the production lead-in time, optimizes the management and control of a supply chain and saves the enterprise management cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
FIG. 1 is a circuit diagram of an integrated positive and negative single-pulse alternative output technique proposed by the present invention;
FIG. 2 is a circuit diagram of a pulse voltage amplitude adjustable technique proposed in the present invention;
fig. 3 is a circuit diagram of the pulse width modulation technique proposed in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that:
a method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width comprises the following steps: an integrated positive and negative single pulse alternative output technology, an integrated positive and negative single pulse alternative output technology and a pulse width adjustable technology,
the integrated positive and negative single pulse alternate output technology comprises the following steps: u1 is an integrated circuit, has boosting and key identification functions, is powered by a 3V button battery, and a boosting circuit is formed by a peripheral inductor L1 and a diode D1; when the keys are operated, the output end of the key is alternately provided with positive and negative monopulse signals according to the sequence of the keys, as shown in fig. 1: the technology of the liquid crystal handwriting board is characterized in that a positive pulse is triggered by a first key, a negative pulse is triggered by a second key, and the liquid crystal handwriting board is cleared by a single pulse, so that the execution efficiency is higher than that of a double pulse, the clearing time is shorter, and the liquid crystal cannot be overturned all the time in the same direction by adopting a mode of alternately outputting the positive pulse and the negative pulse, and the liquid crystal molecules cannot be damaged due to the continuous pressurization in the same direction;
the technology for adjusting the pulse voltage amplitude comprises the following steps: r1 connected to the VSET pin in fig. 2 is used to set the amplitude V of the pulse voltage, and the calculation formula is as follows: v = (R1+40K)/10K, wherein 40K and 10K are fixed values, the fixed value can obtain a required voltage amplitude V by adjusting the value of R1 according to voltage offset and amplification factor inside the chip, and an optimal value can be debugged by using an adjustable resistor in a research and development test stage;
the pulse width adjustable technology comprises the following steps: r2 connected to the TSET pin in fig. 3 is used to set the pulse width T, and the calculation formula is as follows: t = R2/10K +22ms, 10K and 22ms are fixed values, the fixed value is determined according to the parameters of the amplification loop and the pulse trigger bias time arranged in the chip, the required pulse width T can be obtained by adjusting the value of R2, and the optimal value can be debugged by using an adjustable resistor in the research and development test stage.
The method is a method for erasing the liquid crystal handwriting board by using the single pulse with adjustable voltage and adjustable pulse width.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A method for erasing a liquid crystal handwriting board by a single pulse with adjustable voltage and adjustable pulse width comprises the following steps: the integrated positive and negative single pulse alternate output technology, the integrated positive and negative single pulse alternate output technology and the pulse width adjustable technology are characterized in that:
the integrated positive and negative single pulse alternating output technology comprises the following steps: u1 is an integrated circuit, has boosting and key identification functions, is powered by a 3V button battery, and a boosting circuit is formed by a peripheral inductor L1 and a diode D1; the output end of the operation key alternately generates positive and negative monopulse signals according to the sequence of the operation key;
the integrated positive and negative single pulse alternating output technology comprises the following steps: r1 at the VSET pin is used to set the amplitude V of the pulse voltage, which is calculated as follows: v = (R1+40K)/10K, wherein 40K and 10K are fixed values, the fixed value can obtain a required voltage amplitude V by adjusting the value of R1 according to voltage offset and amplification factor inside the chip, and an optimal value can be debugged by using an adjustable resistor in a research and development test stage;
the pulse width adjustable technology comprises the following steps: r2 at the TSET pin is used to set the pulse width T, and is calculated as follows: t = R2/10K +22ms, 10K and 22ms are fixed values, the fixed value is determined according to the parameters of the amplification loop and the pulse trigger bias time arranged in the chip, the required pulse width T can be obtained by adjusting the value of R2, and the optimal value can be debugged by using an adjustable resistor in the research and development test stage.
2. The method for erasing a liquid crystal writing pad with a single pulse of adjustable voltage and adjustable pulse width as claimed in claim 1, wherein: the integrated positive and negative single pulse alternate output technology, the integrated positive and negative single pulse alternate output technology and the pulse width adjustable technology are combined, so that the method for erasing the liquid crystal handwriting board by the single pulse with adjustable voltage and adjustable pulse width is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010934348.3A CN114153322A (en) | 2020-09-08 | 2020-09-08 | Method for erasing liquid crystal handwriting board by single pulse with adjustable voltage and adjustable pulse width |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010934348.3A CN114153322A (en) | 2020-09-08 | 2020-09-08 | Method for erasing liquid crystal handwriting board by single pulse with adjustable voltage and adjustable pulse width |
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| CN114153322A true CN114153322A (en) | 2022-03-08 |
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| CN202010934348.3A Pending CN114153322A (en) | 2020-09-08 | 2020-09-08 | Method for erasing liquid crystal handwriting board by single pulse with adjustable voltage and adjustable pulse width |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985825U (en) * | 2011-01-28 | 2011-09-21 | 北京康拓科技有限公司 | Pulse generation and pulse width protection circuit based on monostabillity |
| CN106125374A (en) * | 2016-08-30 | 2016-11-16 | 重庆卓美华视光电有限公司 | For driving the driving plate of liquid crystal cell in bore hole 3D display module |
| CN208207773U (en) * | 2018-06-11 | 2018-12-07 | 山东蓝贝思特教装集团股份有限公司 | For the multivoltage output circuit of writing film selective erase and application |
| 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 |
-
2020
- 2020-09-08 CN CN202010934348.3A patent/CN114153322A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985825U (en) * | 2011-01-28 | 2011-09-21 | 北京康拓科技有限公司 | Pulse generation and pulse width protection circuit based on monostabillity |
| CN106125374A (en) * | 2016-08-30 | 2016-11-16 | 重庆卓美华视光电有限公司 | For driving the driving plate of liquid crystal cell in bore hole 3D display module |
| CN208207773U (en) * | 2018-06-11 | 2018-12-07 | 山东蓝贝思特教装集团股份有限公司 | For the multivoltage output circuit of writing film selective erase and application |
| 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 |
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