CN112327528B - Circularly alternating unipolar pulse LCD liquid crystal screen image erasing circuit and method - Google Patents
Circularly alternating unipolar pulse LCD liquid crystal screen image erasing circuit and method Download PDFInfo
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- CN112327528B CN112327528B CN201910716336.0A CN201910716336A CN112327528B CN 112327528 B CN112327528 B CN 112327528B CN 201910716336 A CN201910716336 A CN 201910716336A CN 112327528 B CN112327528 B CN 112327528B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a cyclically alternating unipolar pulse LCD liquid crystal screen image erasing circuit and a method thereof, which solve the contradiction problem of image erasing failure and erasing flash screen by an automatic cycle positive and negative pulse erasing method. The automatic cycle positive and negative pulse erasing method has the advantages that the pulses for erasing images each time are single-polarity (all positive pulses or all negative pulses), the pulse polarities of the images erased at the front and back times are opposite, namely, the N (any time) th erased image is opposite to the pulse polarity of the n+1th erased image, meanwhile, due to the fact that the positive and negative polarity pulses are symmetrical, the positive and negative single-polarity pulses are accumulated for multiple times, the positive and negative single-polarity pulses act on the liquid crystal panel to be almost offset, the problem that the liquid crystal panel of the LCD is finally invalid due to the fact that the homopolar pulses act on the panel for a long time, and meanwhile, the problem that the panel is erased due to the fact that the polarity of the positive and negative pulse erasing process is adopted for single-time is solved.
Description
Technical Field
The invention belongs to the technical field of electronic design, and particularly relates to an LCD (liquid crystal display) screen image erasing technology.
Background
The technology of LCD liquid crystal screens is mature, and the LCD liquid crystal screens are widely applied, such as various LCD liquid crystal children handwriting boards, notepads, electronic blackboards and the like. The LCD liquid crystal panel has the advantages of dust-free, blue light-free, ultra-low power consumption, one-key erasure and repeated use, and wide application prospect.
The LCD liquid crystal image erasing technology is to instantaneously discharge the inside of the liquid crystal by applying a voltage to the inside of the liquid crystal, so as to achieve the purpose of dilution, thereby instantaneously separating the adhered liquid crystal parts and achieving the purpose of cleaning. The LCD liquid crystal image erasing method in the current market mainly comprises the following steps: 1. single pulse method (unipolar pulse voltage); 2. multipulse method (including bipolar pulse voltage); 3. ending pulse method (combination of single pulse and multiple pulse method); the above conventional pulse erasure method is prone to cause the following problems: 1. the time is long, and the single pulse method and the ending method polarize the LCD liquid crystal screen, so that the erasing and writing of the later image are invalid; 2. the multi-pulse erasing process is easy to cause the flash screen of the erasing process due to the positive and negative polarity conversion of the voltage. Therefore, in order to solve the above-mentioned three defects of traditional LCD image erasing methods, the present invention proposes a cyclically alternating single-polarity pulse LCD image erasing technique.
Disclosure of Invention
In order to solve the defects of the three LCD image erasing technologies, the invention provides a circularly alternating unipolar pulse LCD image erasing method which has a simple structure, is convenient to realize, can ensure that an LCD liquid crystal screen is not polarized, does not flash when the image is erased, and effectively improves the stability and experience of the LCD liquid crystal screen.
The specific scheme disclosed by the invention is as follows:
1. the utility model provides a single polarity pulse LCD liquid crystal screen image erasure circuit of circulation, the erasure circuit has included image erasure instruction control circuit, boost circuit, image erasure key switch, its characterized in that:
the image erasing instruction control circuit is used for generating and outputting a cyclic alternating unipolar pulse voltage instruction;
the circularly alternating unipolar pulse voltage is connected with an input terminal of the LCD, voltages are applied to different sides of the LCD according to instructions, the unipolar pulse is used for image erasing, and the screen flashing of polarity exchange of the unipolar pulse can be avoided; the cyclic alternation is used for circularly and alternately applying voltages on the front surface and the back surface of the LCD liquid crystal screen to erase images, so that the situation that the screen polarization is caused by applying voltages on one surface of the LCD liquid crystal screen for a long time is avoided, and finally erasing and writing cannot be performed;
the voltage boosting circuit is used for boosting the battery power supply, the boosted voltage is supplied to the image erasing command control circuit, the voltage value determines the single-polarity pulse voltage value of the image erasing command control circuit, and the voltage value can be regulated through a resistor within a certain range.
Further, the image erasing command control circuit is an LCD liquid crystal screen image erasing control core module, the image erasing key switch is an image erasing command trigger point, and the erasing key switch is not limited to a mechanical key switch, and comprises any other switch which only has a trigger function.
Further, the switch is a touch switch.
Further, the signal output port A of the image erasing instruction control circuit is connected with PAD1 of the LCD liquid crystal screen, the middle is connected with an R1 resistor in series, and when the output port A outputs a unipolar voltage signal, the R1 resistor plays a role in limiting current, so that the power consumption is reduced and the service time of a battery is prolonged; the signal output port B of the image erasing instruction control circuit is connected with the PAD2 of the LCD liquid crystal screen, a resistor R2 is connected in series between the PAD1 and the PAD2, the resistance value of the resistor R2 is hundreds of KΩ, and because of the parasitic capacitance effect between the PAD1 and the PAD2 of the LCD liquid crystal screen, after the drawing board erases an image, the resistor R2 can discharge charges on the PAD1 and the PAD2, so that the phenomenon that the drawing and writing cannot be performed for a long time due to overlong discharge in the next use is prevented.
An erasing method of an image erasing circuit of a Liquid Crystal Display (LCD) adopting the circularly alternating unipolar pulse is characterized by comprising the following steps of: and outputting a unipolar pulse command in a circulating way to erase an image of the LCD liquid crystal screen, wherein the LCD liquid crystal image erasing control circuit outputs a group of control commands when receiving the image erasing command, one is a unipolar pulse signal, the other is a signal ground, and the two control commands are output at two ports according to a certain circulating and alternating rule when erasing the image for 2 times.
Further, the port a outputs a unipolar pulse signal when the image is erased for the first time, the port B outputs a signal "ground", the port a outputs a signal "ground" when the image is erased for the second time, the port B outputs a unipolar pulse signal, the port a outputs a unipolar pulse signal again when the image is erased for the third time, and the port B outputs a signal "ground" and loops back in sequence.
Further, the above-mentioned cyclically alternating port outputs are not limited to the order of the port a and the port B, and are not limited to the order of 2 adjacent times as one cycle period, and the integer multiple 2*N (N is a natural number) including 2 times as the cycle period, where the port a outputs a unipolar pulse when the image is erased N times before, the port B outputs a signal "ground", and the port a outputs a signal "ground" when the image is erased N times after, the port B outputs a unipolar pulse, and the cycle is sequentially and alternately performed.
Further, the control command is a voltage signal, and the voltage pulse value of the unipolar pulse is set according to the performance of the LCD panel, and is not limited to a specific voltage value.
Further, the control command output ports A and B are respectively connected with the front and back control terminals of the LCD.
Compared with the prior art, the invention has the following advantages:
the circularly alternating unipolar pulse LCD liquid crystal screen image erasing technology can effectively improve the application stability and experience of the LCD liquid crystal screen, does not generate screen flash in the erasing process, and does not cause that the polarization of the LCD liquid crystal screen cannot be erased; the circuit designed by the method of the invention is easy to realize the structure access, discrete devices or integrated chips such as a singlechip and the like.
Drawings
FIG. 1 is a schematic diagram of a circuit and method for erasing an image of a circularly alternating single polarity pulse LCD panel according to the present invention.
FIG. 2 is a schematic diagram of an image erasing circuit and method for a circularly alternating single polarity pulse LCD according to the present invention.
Detailed Description
The following detailed description of one embodiment of the present invention, disclosed in conjunction with the accompanying drawings, is directed to a cyclically alternating single-polarity pulse LCD image erase technique, and is not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, the cyclically alternating single-polarity pulse LCD image erasing circuit of the present invention comprises: the device comprises a booster circuit, an image erasing key and an image erasing instruction control circuit.
The booster circuit is composed of an inductor L, a diode D1, a capacitor C1, a resistor R3 and an image erasing command control circuit, one end of the inductor L is connected with the anode of the diode D1, meanwhile, the anode of the diode is connected with an output switch signal SW of the image command module, the cathode of the diode is connected with the capacitor C1 and the resistor R3 (which is a booster regulating resistor), and meanwhile, the cathode of the diode is finally output by the booster circuit and is connected with the image erasing command control circuit VHIGH. The final output boost value of the boost circuit determines the pulse value of the single-stage pulse voltage. The voltage value of the unipolar pulse determines the erasing effect of the LCD image, and the higher the voltage value is, the better the erasing effect is.
One end of the image erasing key switch is connected with a battery power supply, the other end of the image erasing key switch is connected with an ER interface of the image erasing instruction control circuit, and the key is triggered to start an image erasing instruction to erase an image.
And the image erasing instruction control circuit outputs a unipolar voltage pulse signal through the output port A or the output port B after the image erasing key is triggered. When 2 images are erased adjacently, the unipolar voltage pulse signals are output at two ports according to a certain alternating rule, for example, the port A outputs a unipolar pulse signal when the images are erased for the first time, the port B outputs a signal "ground", the port A outputs a signal "ground" when the images are erased for the second time, the port B outputs a unipolar pulse signal, the port A outputs a unipolar pulse signal when the images are erased for the third time, and the port B outputs a signal "ground" and then sequentially circulates. The above-mentioned cyclically alternating port outputs are not limited to the order of the port a and the port B, and are not limited to the order of 2 adjacent times as one cycle period, and the integer multiple 2*N (N is a natural number) including 2 times as a cycle period, and when the image is erased N times as before, the port a outputs a unipolar pulse, the port B outputs a signal "ground", and when the image is erased N times later, the port a outputs a signal "ground", and the port B outputs a unipolar pulse, and alternately cycles backward in order.
The output port A and the output port B of the image erasing instruction control circuit are connected with the PAD1 and the PAD2 of the LCD liquid crystal screen, wherein a resistor R1 is connected in series between the port A and the PAD1, the resistor R1 mainly plays a role in limiting current and reducing power consumption (the port B and the PAD2 can be connected in series with the resistor too), the PAD1 and the PAD2 are connected in series with a resistor R2, and after an image is erased by a drawing board, the resistor R2 can drain charges on the PAD1 and the PAD2, so that the phenomenon that the drawing and writing cannot be carried out for a long time due to overlong discharge in the next use is prevented.
The invention also relates to a method for erasing a liquid crystal image of a circularly alternating unipolar pulse LCD, which comprises the following steps:
the voltage boosting circuit is mainly used for boosting the battery power supply, the boosted voltage is provided for the image erasing command control circuit to improve the unipolar pulse voltage value, and the voltage boosting circuit can be regulated through a resistor R3 of the circuit shown in FIG. 2.
The image erasing key switch has one end connected to the battery power supply and the other end connected to the image erasing command control circuit, and is mainly used for the initiation of image erasing command, and the image erasing key switch is a mechanical switch, and in fact, other types of switches are possible, such as a touch switch, etc.
After the trigger signal of the image erasing key switch is received, the image erasing command control circuit circularly and alternately outputs unipolar pulse voltages at a port A and a port B of the image erasing command control circuit, the port A and the port B are respectively connected with a PAD1 and a PAD2 of an LCD liquid crystal screen, the unipolar pulse voltages are added to the LCD liquid crystal screen for erasing images, and the circularly and alternately functions to alternately add the unipolar pulse voltages to two sides of the LCD liquid crystal screen when the images are erased each time, so that the phenomenon that erasing failure is caused by polarization of the LCD screen when pulse voltages are only added to one side of the LCD screen is prevented, and meanwhile, the screen flash caused by bipolar pulse voltages is avoided. In fact, the LCD image erasing command control circuit is not limited to a specific circuit implementation form, and may include a single chip, an integrated dedicated chip, a discrete device circuit, and the like, and the emphasis is on circularly and alternately outputting the unipolar pulse voltage by the technical method of the present invention.
The circuit forms, values and numerical ranges mentioned in the above description are not intended to limit the present invention, but merely to provide preferred embodiments of the present invention, and not to limit the present invention, and various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a single polarity pulse LCD liquid crystal screen image erasure circuit of circulation, the erasure circuit has included image erasure instruction control circuit, boost circuit, image erasure key switch, its characterized in that:
the image erasing instruction control circuit is used for generating and outputting a cyclic alternating unipolar pulse voltage instruction;
the circularly alternating unipolar pulse voltage is connected with an input terminal of the LCD, and is used for applying voltages to different surfaces of the LCD according to the circularly alternating unipolar pulse voltage command, and the unipolar pulse voltage is used for erasing images, so that the flash screen with polarity exchange of the multipolar pulses can be avoided; the circularly alternating unipolar pulse voltage is used for circularly and alternately applying voltages on the front side and the back side of the LCD screen to erase images, so that the situation that the screen polarization is caused by applying voltages on one side of the LCD screen for a long time is avoided, and finally erasing and writing cannot be performed;
the voltage boosting circuit is used for boosting the battery power supply, the boosted voltage is supplied to the image erasing command control circuit, the voltage value determines the single-polarity pulse voltage value of the image erasing command control circuit, and the voltage value can be regulated through a resistor within a certain range.
2. The cyclically alternating single-polarity pulse LCD panel image erasing circuit of claim 1, wherein: the image erasing instruction control circuit is an LCD liquid crystal screen image erasing control core module, the image erasing key switch is an image erasing instruction trigger point, and the erasing key switch is not limited to a mechanical key switch and comprises any other switch which only plays a trigger role.
3. The cyclically alternating single-polarity pulse LCD panel image erasing circuit of claim 2, wherein: the switch is a touch switch.
4. The cyclically alternating single-polarity pulse LCD panel image erasing circuit of claim 1 or 2, wherein: the signal output port A of the image erasing instruction control circuit is connected with the PAD1 of the LCD liquid crystal screen, the middle is connected with the R1 resistor in series, and when the output port A outputs a unipolar voltage signal, the R1 resistor plays a role in limiting current, so that the power consumption is reduced and the service time of a battery is prolonged; the signal output port B of the image erasing instruction control circuit is connected with the PAD2 of the LCD liquid crystal screen, a resistor R2 is connected in series between the PAD1 and the PAD2, the resistance value of the resistor R2 is hundreds of KΩ, and because of the parasitic capacitance effect between the PAD1 and the PAD2 of the LCD liquid crystal screen, after the drawing board erases an image, the resistor R2 can discharge charges on the PAD1 and the PAD2, so that the phenomenon that the drawing and writing cannot be performed for a long time due to overlong discharge in the next use is prevented.
5. An erasing method using the cyclically alternating single-polarity pulse LCD panel image erasing circuit of claim 1, wherein: and outputting a unipolar pulse command in a circulating way to erase an image of the LCD liquid crystal screen, wherein the LCD liquid crystal image erasing control circuit outputs a group of control commands when receiving the image erasing command, one is a unipolar pulse signal, the other is a signal ground, and the two control commands are output at two ports according to a certain circulating and alternating rule when erasing the image for 2 times.
6. The method for erasing an image of a cyclically alternating single-polarity pulsed LCD lc panel of claim 5, wherein: when the image is erased for the first time, the port A outputs a unipolar pulse signal, the port B outputs a signal 'ground', when the image is erased for the second time, the port B outputs a unipolar pulse signal, and when the image is erased for the third time, the port A outputs a unipolar pulse signal again, and the port B outputs a signal 'ground', and then the signals are circulated in sequence.
7. The method of claim 5 or 6, wherein the cyclically alternating ports are not limited to the order of ports a and B, but are also not limited to the order of 2 adjacent cycles, wherein the cycle is an integer multiple 2*N (N is a natural number) of 2 times, wherein the ports a output the unipolar pulse when the images are erased N times before, the ports B output the signal "ground", and the ports a output the signal "ground" when the images are erased N times after, and the ports B output the unipolar pulse and alternate cycles after.
8. The method of claim 5 or 6, wherein the control command is a voltage signal, and the voltage pulse value of the unipolar pulse is set according to the performance of the LCD panel, but not limited to a specific voltage value.
9. The method for erasing an image of a cyclically alternating single-polarity pulse LCD panel according to claim 5 or 6, wherein said control command output ports a and B are connected to the front and back control terminals of the LCD panel, respectively.
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| CN201910716336.0A CN112327528B (en) | 2019-08-05 | 2019-08-05 | Circularly alternating unipolar pulse LCD liquid crystal screen image erasing circuit and method |
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| CN201910716336.0A CN112327528B (en) | 2019-08-05 | 2019-08-05 | Circularly alternating unipolar pulse LCD liquid crystal screen image erasing circuit and method |
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| CN112327528B true CN112327528B (en) | 2023-04-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000214479A (en) * | 1999-01-25 | 2000-08-04 | Canon Inc | Liquid crystal elements |
| CN1771528A (en) * | 2004-03-09 | 2006-05-10 | 精工爱普生株式会社 | Display device and image erasing method |
| CN102034439A (en) * | 2009-09-28 | 2011-04-27 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| CN206099742U (en) * | 2016-08-30 | 2017-04-12 | 重庆卓美华视光电有限公司 | The liquid crystal molecules drive arrangement and system |
| CN209133203U (en) * | 2018-09-27 | 2019-07-19 | 陈华丰 | A kind of liquid crystal display drive circuit and electronic writing terminal |
-
2019
- 2019-08-05 CN CN201910716336.0A patent/CN112327528B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000214479A (en) * | 1999-01-25 | 2000-08-04 | Canon Inc | Liquid crystal elements |
| CN1771528A (en) * | 2004-03-09 | 2006-05-10 | 精工爱普生株式会社 | Display device and image erasing method |
| CN102034439A (en) * | 2009-09-28 | 2011-04-27 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| CN206099742U (en) * | 2016-08-30 | 2017-04-12 | 重庆卓美华视光电有限公司 | The liquid crystal molecules drive arrangement and system |
| CN209133203U (en) * | 2018-09-27 | 2019-07-19 | 陈华丰 | A kind of liquid crystal display drive circuit and electronic writing terminal |
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