CN112327528A - Circuit and method for erasing images of Liquid Crystal Display (LCD) screen by circularly alternating unipolar pulses - Google Patents
Circuit and method for erasing images of Liquid Crystal Display (LCD) screen by circularly alternating unipolar pulses Download PDFInfo
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- CN112327528A CN112327528A CN201910716336.0A CN201910716336A CN112327528A CN 112327528 A CN112327528 A CN 112327528A CN 201910716336 A CN201910716336 A CN 201910716336A CN 112327528 A CN112327528 A CN 112327528A
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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 circuit and a method for erasing images of a Liquid Crystal Display (LCD) by circularly alternating unipolar pulses, which solve the problem of contradiction between image erasing failure and screen flashing erasing by an automatic circulating positive and negative pulse erasing method. The pulse of every image erasing by the automatic circulation positive and negative pulse erasing method is unipolar (all positive pulses or all negative pulses), the polarities of the pulses of the two images erased before and after are opposite, namely the polarities of the pulses of the image erased at the Nth (any certain time) and the (N + 1) th image erased are opposite, and due to the symmetry of the positive and negative pulses, multiple times of erasing are accumulated, the positive and negative unipolar pulses almost counteract the effects of the positive and negative unipolar pulses on the liquid crystal panel, so that the problem that the erasing is finally invalid due to the unipolar effect of the homopolar pulses on the liquid crystal panel for a long time is effectively avoided, and the problem that the erasing of the flash screen is caused by the polarity positive and negative switching in the positive and negative pulse erasing process of single.
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 LCD liquid crystal screen technology is mature day by day, and the LCD liquid crystal screen is applied more and more widely, such as various LCD liquid crystal children handwriting boards, notepads, electronic blackboards and the like. The LCD liquid crystal panel has no dust, no blue light, ultra-low power consumption, one-key erasing and repeated use, and wide application prospect.
The LCD liquid crystal image erasing technology is that a voltage is applied to the inside of the liquid crystal to make the inside of the liquid crystal discharge instantly, so as to dilute the liquid crystal, and instantly separate the liquid crystal parts which are adhered together, thereby achieving the purpose of clearing. The LCD liquid crystal image erasing method in the current market mainly comprises the following steps: one, single pulse method (unipolar pulse voltage); two, multi-pulse method (including bipolar pulse voltage); a final pulse method (combination of a single pulse method and a multi-pulse method); the above conventional pulse erasing methods all easily cause the following problems: firstly, the single pulse method and the ending method can polarize an LCD screen for a long time, so that the erasing and writing of a subsequent image are invalid; and secondly, in the multi-pulse erasing process, due to the positive and negative polarity conversion of the voltage, the screen flashing is easily caused in the erasing process. Therefore, in order to solve the defects of the three conventional LCD image erasing methods, the invention provides a circularly alternating unipolar pulse LCD image erasing technology.
Disclosure of Invention
In order to overcome the defects of the three LCD image erasing technologies, the invention discloses a circularly alternating unipolar pulse LCD image erasing method which is simple in structure, convenient to realize, capable of ensuring that an LCD screen is not polarized and not flickered during image erasing, and capable of effectively improving the stability and the experience of the LCD screen.
The specific scheme disclosed by the invention is as follows:
1. a circuit for erasing images on a Liquid Crystal Display (LCD) screen by circularly alternating unipolar pulses comprises an image erasing command control circuit, a booster circuit and an image erasing key switch, and is 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 screen, voltages are applied to different surfaces of the LCD screen according to instructions, unipolar pulses are used for image erasing, and screen flashing of polarity exchange of the multipolar pulses can be avoided; the cyclic alternation is used for cyclically and alternately applying voltage to the front side and the back side of the LCD screen to erase images, so that the phenomenon that the screen polarization is caused by applying voltage to only one side of the LCD screen for a long time and the screen cannot be erased and written finally is avoided;
the boosting circuit is used for boosting the battery power supply, the boosted voltage is supplied to the image erasing command control circuit, the boosted voltage value determines the voltage value of the unipolar pulse of the image erasing command control circuit, and the boosted voltage value can be adjusted within a certain range through a resistor.
Further, the image erasing instruction control circuit is an LCD 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 includes any other type of switch as long as it has a triggering function.
Further, the switch is a touch switch.
Furthermore, the signal output port A of the image erasing instruction control circuit is connected with the PAD1 of the LCD, an R1 resistor is connected in series in the middle, 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 life 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, a resistor R2 is connected between the PAD1 and the PAD2 in series, the resistance value of the resistor R2 is usually hundreds of K omega, and due to the fact that a capacitance parasitic effect exists between the PAD1 and the PAD2 of the LCD, after an image is erased on the drawing board, charges on the PAD1 and the PAD2 can be discharged through the resistor R2, and the fact that drawing and writing cannot be conducted for a long time due to overlong discharging in the next use is prevented.
An erasing method adopting the circularly alternating unipolar pulse LCD liquid crystal screen image erasing circuit is characterized in that: and circularly and alternately outputting unipolar pulse instructions to erase the LCD images, wherein the LCD image erasing control circuit outputs a group of control instructions when receiving the image erasing instructions, one control instruction is a unipolar pulse signal, the other control instruction is a signal 'ground', and the two control instructions are output at two ports according to a certain circularly and alternately rule when the images are erased for 2 times.
Further, 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 a outputs a signal "ground", the port B outputs a unipolar pulse signal, 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 operations are sequentially repeated.
Further, the cyclically alternating port output is not limited to the sequence of the port a and the port B, and is also not limited to the cycle period of adjacent 2 times, and includes the cycle period of integral multiple 2 × N (N is a natural number) times of 2, for example, the port a outputs a unipolar pulse when the image is erased for the previous N times, the port B outputs a signal "ground", the port a outputs a signal "ground" when the image is erased for the next N times, and the port B outputs a unipolar pulse and sequentially and cyclically follows.
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.
Furthermore, the control instruction output ports A and B are respectively connected with the front control terminal and the back control terminal of the LCD screen.
Compared with the prior art, the invention has the following advantages:
by adopting the circularly alternating unipolar pulse LCD screen image erasing technology, the application stability and experience of the LCD screen can be effectively improved, screen flashing can not occur in the erasing process, and the polarization of the LCD screen can not be erased; the circuit designed by the method has a structure which is easy to realize by connecting single chips, discrete devices or single chips and other integrated chips.
Drawings
FIG. 1 is a schematic diagram of a circuit for erasing images on a cyclically alternating unipolar pulsed LCD panel and a method thereof according to the present invention.
FIG. 2 is a schematic diagram of an embodiment of a circuit and method for erasing an LCD panel according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, but not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the cyclically alternating unipolar pulse LCD image erasing circuit of the present invention includes: the device comprises a booster circuit, an image erasing key and an image erasing command control circuit.
The boosting 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, the anode of the diode is connected with an output switching signal SW of the image command module, the cathode of the diode is connected with the capacitor C1 and the resistor R3 (which are boosting adjusting resistors), and the cathode of the diode is finally output by the boosting 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 level of the unipolar pulse voltage value determines the image erasing effect of the LCD, and generally, the higher the voltage value, the better the erasing effect.
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 image erasing instruction is started by triggering the key to erase the image.
When the image erasing key is triggered, the output port A or the output port B of the image erasing instruction control circuit outputs a unipolar voltage pulse signal. When the images are erased for 2 times, the unipolar voltage pulse signals are output from the two ports according to a certain alternating rule, for example, when the images are erased for the first time, the port a outputs the unipolar pulse signal, the port B outputs the signal "ground", when the images are erased for the second time, the port a outputs the signal "ground", the port B outputs the unipolar pulse signal, when the images are erased for the third time, the port a outputs the unipolar pulse signal, and the port B outputs the signal "ground", and the following sequential cycles are performed. The cyclically alternating port output is not limited to the sequence of the port a and the port B, and is also not limited to the cycle period of 2 times, and includes the cycle period of 2 times which is integral multiple of 2 times N (N is a natural number), for example, the port a outputs a unipolar pulse when the image is erased for the first N times, the port B outputs a signal "ground", the port a outputs a signal "ground" when the image is erased for the next N times, and the port B outputs a unipolar pulse and sequentially and cyclically alternates backwards.
The output port A and the port B of the image erasing instruction control circuit are connected with the PAD1 and the PAD2 of an LCD (liquid crystal display) screen, wherein a resistor R1 is connected between the port A and the PAD1 in series, the resistor R1 mainly plays a role in limiting current and reducing power consumption (the port B and the PAD2 can also be connected with resistors in series), the PAD1 and the PAD2 are connected with a resistor R2 in series, and after an image is erased by the drawing board, the resistor R2 can discharge charges on the PAD1 and the PAD2, so that the situation that the next time of use cannot draw and write for a long time due.
The invention also relates to a circularly alternating unipolar pulse LCD liquid crystal image erasing method, which comprises the following steps:
the boosting circuit mainly boosts the battery power supply, the boosted voltage is provided to the image erasing command control circuit to improve the unipolar pulse voltage value, and the boosting circuit can be adjusted through a resistor R3 of the circuit shown in FIG. 2.
The image erasing key switch is mainly used for initiating an image erasing instruction, is a mechanical switch, and is actually feasible with other types of switches, such as a touch switch and the like.
The image erasing instruction control circuit circularly and alternately outputs unipolar pulse voltage at a port A and a port B of the image erasing instruction control circuit after receiving a trigger signal of an image erasing key switch, the port A and the port B are respectively connected with PAD1 and PAD2 of an LCD (liquid crystal display), the unipolar pulse voltage is applied to the LCD for erasing images, and the circularly and alternately function is that the unipolar pulse voltage is alternately applied to two sides of the LCD when the images are erased at each time, so that the phenomenon that the LCD is polarized due to the fact that the pulse voltage is only applied to one side of the LCD can be prevented, erasing failure is caused, and meanwhile screen flash caused by the bipolar pulse voltage can be avoided. In fact, the LCD image erasing command control circuit, not limited to a specific circuit implementation form, may include a single chip, an integrated special chip, a discrete device circuit, etc., and the emphasis is that the technical method of the present invention cyclically and alternately outputs the unipolar pulse voltage.
The above description is only a preferred embodiment of the present invention, and the circuit form, values and value ranges mentioned in the above description are not intended to limit the present invention, but only to provide a preferred embodiment of the present invention, and not to limit the present invention, and it is obvious to those skilled in the art that various modifications and changes can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A circuit for erasing images on a Liquid Crystal Display (LCD) screen by circularly alternating unipolar pulses comprises an image erasing command control circuit, a booster circuit and an image erasing key switch, and is 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 screen, voltages are applied to different surfaces of the LCD screen according to instructions, unipolar pulses are used for image erasing, and screen flashing of polarity exchange of the multipolar pulses can be avoided; the cyclic alternation is used for cyclically and alternately applying voltage to the front side and the back side of the LCD screen to erase images, so that the phenomenon that the screen polarization is caused by applying voltage to only one side of the LCD screen for a long time and the screen cannot be erased and written finally is avoided;
the boosting circuit is used for boosting the battery power supply, the boosted voltage is supplied to the image erasing command control circuit, the boosted voltage value determines the voltage value of the unipolar pulse of the image erasing command control circuit, and the boosted voltage value can be adjusted within a certain range through a resistor.
2. The cyclically alternating unipolar pulsed LCD liquid crystal panel image erase circuit of claim 1, wherein: the image erasing instruction control circuit is an LCD (liquid crystal display) 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 type of switch which only plays a triggering role.
3. The cyclically alternating unipolar pulsed LCD liquid crystal panel image erase circuit of claim 2, wherein: the switch is a touch switch.
4. The cyclically alternating unipolar pulsed LCD liquid crystal panel image erasing circuit of claim 1 or 2, wherein: the image erasing instruction control circuit signal output port A is connected with PAD1 of an LCD screen, an R1 resistor is connected in series in the middle, and when the output port A outputs a unipolar voltage signal, the R1 resistor plays a role in limiting current, power consumption is reduced, and the service life 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, a resistor R2 is connected between the PAD1 and the PAD2 in series, the resistance value of the resistor R2 is usually hundreds of K omega, and due to the fact that a capacitance parasitic effect exists between the PAD1 and the PAD2 of the LCD, after an image is erased on the drawing board, charges on the PAD1 and the PAD2 can be discharged through the resistor R2, and the fact that drawing and writing cannot be conducted for a long time due to overlong discharging in the next use is prevented.
5. An erasing method using the cyclically alternating unipolar pulse LCD liquid crystal panel image erasing circuit according to claim 1, characterized in that: and circularly and alternately outputting unipolar pulse instructions to erase the LCD images, wherein the LCD image erasing control circuit outputs a group of control instructions when receiving the image erasing instructions, one control instruction is a unipolar pulse signal, the other control instruction is a signal 'ground', and the two control instructions are output at two ports according to a certain circularly and alternately rule when the images are erased for 2 times.
6. The method of claim 5, wherein the method comprises: 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 A outputs a signal 'ground', the port B outputs a unipolar pulse signal, 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', wherein the operation is sequentially repeated.
7. The method according to claim 5 or 6, wherein the cyclically alternating port outputs are not limited to the sequence of port A and port B, and also not limited to the sequence of adjacent 2 times as a cycle period, and include an integral multiple of 2N (N is a natural number) times as the cycle period, for example, when the previous N times of image erasing, port A outputs a unipolar pulse, port B outputs a signal "ground", when the next N times of image erasing, port A outputs a signal "ground", and port B outputs a unipolar pulse, and the cycle is repeated in sequence.
8. The method according to 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 LCD panel performance, and is not limited to a specific voltage value.
9. The method according to claim 5 or 6, wherein the 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 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 |
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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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