CN110888248B - Local erasing device for liquid crystal writing board and writing erasing pen for liquid crystal writing board - Google Patents
Local erasing device for liquid crystal writing board and writing erasing pen for liquid crystal writing board Download PDFInfo
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- CN110888248B CN110888248B CN201811052227.5A CN201811052227A CN110888248B CN 110888248 B CN110888248 B CN 110888248B CN 201811052227 A CN201811052227 A CN 201811052227A CN 110888248 B CN110888248 B CN 110888248B
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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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
- G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
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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
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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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
- G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
Abstract
The invention discloses a local erasing device of a liquid crystal handwriting board and a writing erasing pen of the liquid crystal handwriting board. The liquid crystal handwriting board local erasing device comprises a power supply, a driving circuit and an ultrasonic generation assembly, wherein the power supply is electrically connected with the driving circuit, the driving circuit is electrically connected with the ultrasonic generation assembly, the ultrasonic generation assembly comprises a matching layer, an ultrasonic generator and a backing layer which are sequentially stacked, and the matching layer is located on one side, which is contacted with the liquid crystal handwriting board, of the ultrasonic generation assembly. The liquid crystal writing pad local erasing device and the liquid crystal writing pad writing erasing pen provided by the invention can erase the local part of the liquid crystal writing pad by adopting ultrasonic waves, and are energy-saving, environment-friendly, safe and convenient to use.
Description
Technical Field
The invention relates to the technical field of liquid crystal display application, in particular to a liquid crystal handwriting board local erasing device and a liquid crystal handwriting board writing erasing pen.
Background
At present, in the field of liquid crystal writing pads, the erasing mode of the liquid crystal writing pad mainly comprises power-on and all erasing, the mode has great influence on user experience, and meanwhile, the liquid crystal writing pad cannot expand the market, particularly the maximum resistance of the military education market. The external fields influencing the arrangement and structure of the liquid crystal mainly comprise five types of external fields, namely sound, light, electricity, heat and magnetism, the currently mainstream local erasing method uses three types of external fields, namely light, electricity and heat, but the aging of the liquid crystal handwriting board can be accelerated by the light and the heat, the manufacturing process of the handwriting board is more complicated and the cost is higher by using an electric field to realize local erasing, the influence of a magnetic field on the liquid crystal material is weaker, and the fact that the local erasing is realized by directly acting on the liquid crystal material by using the magnetic field is not practical.
The local erasing of the liquid crystal handwriting board is a technical problem which is difficult to solve for a long time in the field, the Chinese utility model patent with the application number of CN201620117008.0, which is proposed by Shenzhen Weiku photoelectricity Limited company, the patent right discloses a semiconductor thermal erasing technology, a semiconductor block is used for heating liquid crystal to isotropic liquid, the liquid crystal stably exists in a weakly scattering multi-domain structure after being cooled, so that the conversion from a plane reflection state to a focal cone scattering state is realized, namely, the purpose of erasing the handwriting is realized, but the semiconductor heat transfer rate is slow, the hidden danger of scalding and the problem of large energy consumption are existed, in addition, the mode limits the actual use temperature range of the liquid crystal handwriting board, the thin film material and the liquid crystal material of the handwriting board are accelerated to age, and the service life of the liquid crystal handwriting board is seriously influenced.
Disclosure of Invention
The invention aims to provide a liquid crystal handwriting board local erasing device and a liquid crystal handwriting board writing erasing pen aiming at the technical problems in the prior art, wherein the local erasing of the liquid crystal handwriting board is realized by adopting ultrasonic waves, so that the liquid crystal handwriting board writing erasing pen is energy-saving, environment-friendly and safe and convenient to use.
The invention adopts the following technical scheme:
the utility model provides a device is erased locally to liquid crystal handwriting pad, device is erased locally to liquid crystal handwriting pad includes that power, drive circuit and supersound take place the subassembly, the power with drive circuit electric connection, drive circuit with subassembly electric connection takes place for the supersound, the subassembly takes place for the supersound includes the matching layer, ultrasonic generator and the back lining layer that stack gradually the setting, the matching layer is located one side that the subassembly was taken place for the supersound and the contact of liquid crystal handwriting pad.
Preferably, the ultrasonic generator is one of a piezoelectric transducer, a magnetostrictive transducer, an electrostatic transducer, or a combination thereof, for emitting ultrasonic waves.
Preferably, the matching layer is comprised of a single or multi-layer dielectric.
Preferably, the matching layer is formed by a single layer of medium, and the acoustic impedance value of the single layer of medium is gradually decreased along the direction far away from the ultrasonic generator.
Preferably, the surface of the matching layer, which is in contact with the liquid crystal handwriting board, is a plane or a rough surface with microstructure protrusions.
Preferably, the microstructure protrusions are tetrahedral structures.
Preferably, the matching layer is formed of a multilayer medium, and acoustic impedance values of the multilayer medium decrease in a direction away from the ultrasonic generator.
Preferably, the material of the matching layer is selected from one or more of metal or metal oxide, inorganic nonmetal, and polymer material.
Preferably, the metal is tungsten or aluminum, the metal oxide is tungsten oxide or aluminum oxide, and the inorganic nonmetal is silicon dioxide.
Preferably, the polymer material comprises one or more of epoxy resin, polyester and polyvinyl chloride, or a combination of one or more of epoxy resin, polyester and polyvinyl chloride polymer material and filler.
Preferably, the filler is an inert metal powder or a non-metal powder.
Preferably, the ultrasonic generator is a single ultrasonic generator, or a plurality of ultrasonic generator arrays combined in series or parallel.
Preferably, the shape of the ultrasonic generator is a combination of one or more of a circle, a square, and a rectangle.
Preferably, the device for locally erasing the liquid crystal handwriting board further comprises a gel layer or a polymer elastomer layer which is located on one side, away from the ultrasonic generator, of the matching layer, and when the liquid crystal handwriting board is locally erased, the gel layer or the polymer elastomer layer is tightly attached to the upper substrate of the liquid crystal handwriting board.
Preferably, the backing layer is composed of one or more of epoxy, polyester, polyvinyl chloride and a metal or non-metal oxide solid filler, the backing layer being configured to absorb sound waves reflected at the interface.
On the other hand, the invention also provides a liquid crystal writing board writing and erasing pen which comprises a writing end and an erasing end, wherein the erasing end comprises the liquid crystal writing board local erasing device.
Preferably, the writing end and the erasing end are respectively positioned at two ends of the pen body.
Preferably, the erasing end is detachably connected with the pen body.
Preferably, the liquid crystal writing board writing and erasing pen further comprises a charging device connected with the power supply.
The liquid crystal writing pad local erasing device and the liquid crystal writing pad writing erasing pen provided by the invention can erase the local part of the liquid crystal writing pad by adopting ultrasonic waves, and are energy-saving, environment-friendly, safe and convenient to use.
Drawings
The invention may be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of an ultrasonic generating assembly in a local erasing apparatus for a liquid crystal writing pad according to an embodiment of the present invention, in which a matching layer is formed by a single medium;
FIG. 2 is a schematic diagram of a matching layer formed by a single-layer medium in an ultrasonic generating assembly of a local erasing apparatus for a liquid crystal writing pad according to an embodiment of the present invention, and a plurality of microstructure protrusions on the surface of the matching layer are tetrahedral structures;
FIG. 3 is a schematic structural diagram of an ultrasonic generation assembly in a local erasing apparatus for a liquid crystal writing pad according to an embodiment of the present invention, in which a matching layer is composed of multiple layers of media;
FIG. 4 is a schematic structural diagram of a wedge-shaped matching layer in an ultrasonic generating assembly in a local erasing apparatus for a liquid crystal handwriting board according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an ultrasonic generator assembly of a local erasing apparatus for a liquid crystal writing pad according to an embodiment of the present invention, wherein a gel layer or a polymer elastomer layer is attached to the ultrasonic generator assembly;
FIG. 6 is a schematic diagram of the overall structure of a liquid crystal writing tablet writing and erasing pen according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a liquid crystal writing tablet for writing with a liquid crystal writing tablet erasing pen according to an embodiment of the present invention;
FIG. 8 is a schematic representation of the texture of the liquid crystal in the liquid crystal writing tablet in the state shown in FIG. 7;
FIG. 9 is a schematic diagram of a liquid crystal writing tablet for partial erasure by using a liquid crystal writing tablet erasing pen according to an embodiment of the present invention;
fig. 10 is a schematic view of the texture of the liquid crystal in the liquid crystal handwriting board book in the state shown in fig. 9.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. The illustrated exemplary embodiments of the invention are provided for purposes of illustration only and are not intended to be limiting of the invention. Therefore, it is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
The liquid crystal writing pad local erasing apparatus and the liquid crystal writing pad writing erasing pen according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a matching layer in an ultrasonic generating component in a local erasing apparatus for a liquid crystal handwriting board according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a matching layer in an ultrasonic generating component in a local erasing apparatus for a liquid crystal handwriting board according to an embodiment of the present invention, the matching layer being composed of a single-layer medium, and a plurality of microstructure protrusions on the surface of the matching layer being tetrahedral structures, fig. 3 is a schematic structural diagram of a matching layer in an ultrasonic generating component in a local erasing apparatus for a liquid crystal handwriting board according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of a matching layer in an ultrasonic generating component in a local erasing apparatus for a liquid crystal handwriting board according to an embodiment of the present invention being wedge-shaped. Referring to fig. 1 to 4, the apparatus for locally erasing a liquid crystal writing pad according to an embodiment of the present invention includes a power source (not shown), a driving circuit (not shown), and an ultrasonic generating assembly 10. The power supply is electrically connected with the driving circuit, the driving circuit is electrically connected with the ultrasonic generation assembly 10, the ultrasonic generation assembly 10 comprises a matching layer 11, an ultrasonic generator 12 and a backing layer 13 which are sequentially arranged, and the matching layer 11 is positioned on one side of the ultrasonic generation assembly 10, which is contacted with the liquid crystal handwriting board.
In an embodiment of the present invention, the ultrasonic generator 12 is one or a combination of a piezoelectric transducer, a magnetostrictive transducer, and an electrostatic transducer, and is used for emitting ultrasonic waves. For example, in the embodiment of the present invention, a piezoelectric ceramic plate PZT in the piezoelectric transducer is adopted, and is a piezoelectric crystal having axial and longitudinal expansion and contraction properties, which can realize electromechanical conversion and generate a sound wave with a certain frequency. The piezoelectric ceramic sheet may be made of lead zirconate titanate or barium titanate. The matching layer 11 is made of a single-layer or multi-layer medium, the material of the matching layer is generally an insulator material with compact and low damping, and the material has low absorption and attenuation of ultrasonic waves, for example, as shown in fig. 1, the matching layer 11 is made of a single-layer medium, and the acoustic impedance value of the single-layer medium gradually decreases along the direction away from the ultrasonic generator 12. In an embodiment of the present invention, the lower surface of the matching layer 11 may be a smooth plane (as shown in fig. 1), or may be a rough surface with microstructure protrusions, for example, the microstructure protrusions may be cylinders, cubes, cones, tetrahedrons, or other polyhedral structures. Preferably, as shown in fig. 2, in the embodiment of the present invention, the microstructure protrusions are tetrahedral structures. Further, the matching layer 11 may be formed of a multilayer medium, and the acoustic impedance values of the multilayer medium decrease in a direction away from the ultrasonic generator 12, as shown in fig. 3, the matching layer 11 includes two layers of media, i.e., a first matching layer 111 and a second matching layer 112, the first matching layer 111 is adjacent to the ultrasonic generator 12, the acoustic impedance value of the first matching layer 111 is greater than the acoustic impedance value of the second matching layer 112, for example, the acoustic impedance value of the first matching layer 111 is 15-20MRayl, and the acoustic impedance value of the second matching layer 112 is 3-5 MRayl. The matching layer 11 may be provided with a uniform thickness, such as, but not limited to, fig. 1 and 2. The matching layer 11 may be provided in a case where the thickness is not uniform, for example, as shown in fig. 4, the matching layer 11 has a wedge-shaped structure, the cross section of the matching layer 11 has a triangular shape, and the thickness thereof is gradually changed, and the present invention is not limited thereto. The cross section of the matching layer 11 may also be, for example, a trapezoid, a circular arc, a wave, other polygon or other irregular shape, and is not particularly limited. The first matching layer 111 is a composite material containing a polymer such as epoxy resin, polyester, or polyvinyl chloride, and solid powder such as lead zirconate titanate, tungsten oxide, iron oxide, titanium dioxide, or silicon dioxide. The second matching layer 112 is a material having elasticity and self-adhesiveness, such as a gel-like substance or a polymer elastomer. The second matching layer 112 enables the local erasing device of the liquid crystal handwriting board to be in close contact with the liquid crystal handwriting board, so that air between the local erasing device of the liquid crystal handwriting board and the upper substrate of the liquid crystal handwriting board can be reduced, sound wave attenuation can be reduced, and sound wave propagation efficiency can be improved; while also preventing writing marks during the erasing process, which may occur due to the pressure of the writing pad against the second matching layer 112. The second matching layer 112 is a low acoustic impedance organic polymer such as silicone gel, silicone rubber, or the like, but is not limited thereto. The first matching layer 111 and the second matching layer 112 can be bonded by various methods such as adhesive bonding, chemical bonding after surface modification, chemical bonding after doping modification, physical adsorption after surface treatment changes surface tension, and the like.
In an embodiment of the present invention, the ultrasonic generator 12 may have two resonance directions, an axial direction (a direction perpendicular to the plane of the layer in which the ultrasonic generator 12 is located) and a radial direction (a direction parallel to the plane of the layer in which the ultrasonic generator 12 is located), and the resonance direction of the ultrasonic generator 12 can be switched by adjusting the voltage. When the applied voltage is at axial or radial resonance, the ultrasonic generator 12 will generate axial or radial vibrations, respectively. In the embodiment of the invention, in fig. 1 and 3, the liquid crystal handwriting board can be well erased by adopting radial vibration, and in fig. 2 and 4, the liquid crystal handwriting board can be well erased by adopting axial vibration. The difference between the embodiment of fig. 2 and the embodiments of fig. 1, 3, and 4 is that in the embodiments of fig. 1, 3, and 4, the ultrasonic wave is directly transmitted into the liquid crystal layer through the upper substrate of the liquid crystal handwriting pad to change the orientation of the liquid crystal, and in the embodiment of fig. 2, the ultrasonic generator 12 vibrates to cause the regular vibration of the upper substrate of the liquid crystal handwriting pad to change the orientation of the liquid crystal, which is the reason for setting the above structure in the embodiment of the present invention.
In the embodiment of the present invention, the material of the matching layer 11 is selected from one or more of metal or metal oxide, inorganic nonmetal, and polymer material. For example, preferably, wherein the metal is tungsten or aluminum; wherein the metal oxide is tungsten oxide or aluminum oxide; wherein the inorganic nonmetal is silicon dioxide; the polymer material comprises one or more of epoxy resin, polyester and polyvinyl chloride, or comprises a combination of one or more of epoxy resin, polyester and polyvinyl chloride polymer material and a filler, wherein the filler is inert metal powder or nonmetal powder.
In the embodiment of the present invention, the ultrasonic generator 12 may be a single ultrasonic generator, or may be a plurality of ultrasonic generator arrays combined in series or parallel. In a specific embodiment of the present invention, the shape of the ultrasonic generator 12 can be one or more combinations of circular, square and rectangular, and can be adjusted accordingly according to different specific use scenarios.
FIG. 5 is a schematic structural diagram of a liquid crystal writing pad local erasing apparatus according to an embodiment of the present invention, in which a gel layer or a polymer elastomer layer is attached to an ultrasonic generating assembly. As shown in fig. 5, in the embodiment of the present invention, it is preferable that the liquid crystal handwriting board further includes a gel layer or a polymer elastomer layer 14 located on the matching layer 11 on the side away from the ultrasonic generator 12, when the liquid crystal handwriting board is partially erased, the gel layer or the polymer elastomer layer is tightly attached to the upper substrate of the liquid crystal handwriting board to exhaust air between the liquid crystal handwriting board partial erasing apparatus and the upper substrate of the liquid crystal handwriting board, so that the ultrasonic wave enters the liquid crystal layer in the liquid crystal handwriting board more effectively, thereby reducing attenuation of the ultrasonic wave, increasing propagation efficiency of the ultrasonic wave, and preventing occurrence of writing marks due to pressure applied by the matching layer 11 on the liquid crystal handwriting board during erasing.
In the embodiment of the invention, the backing layer 13 is composed of polymer and metal or nonmetal oxide solid fillers such as epoxy resin, polyester, polyvinyl chloride and the like, and is used for absorbing sound waves reflected at the interface, reducing the influence of reflection at the interface, eliminating interference and improving the utilization rate of ultrasonic waves entering the liquid crystal handwriting board. In the embodiment of the present invention, the matching layer 11 and the ultrasonic generator 12 and the backing layer 13 may be bonded by, for example, an adhesive, but not limited thereto, and may be bonded by various methods such as chemical bonding after surface modification, chemical bonding after doping modification, physical adsorption after surface treatment to change surface tension, and the like.
Fig. 6 is a schematic diagram of the overall structure of the liquid crystal writing tablet writing and erasing pen according to the embodiment of the invention. As shown in fig. 6, the liquid crystal writing tablet writing and erasing pen according to the embodiment of the present invention includes a writing end 200 and an erasing end 100, and the erasing end 100 includes the above-mentioned liquid crystal writing tablet local erasing apparatus according to the present invention. As shown in fig. 6, in the embodiment of the present invention, the writing end 200 and the erasing end 100 are respectively located at two ends of the pen body 300, the writing end 200 has a writing nib for writing on the liquid crystal writing pad by directly contacting the liquid crystal writing pad, and the power supply and the driving circuit part in the local erasing apparatus for liquid crystal writing pad of the present invention may be installed inside the pen body 300 or at the connection between the pen body 300 and the writing end 200 or the erasing end 100, but is not limited thereto. The power supply and the driving circuit part may also be installed at other positions of the whole writing and erasing pen, or connected in a wireless transmission manner, etc., without specific limitations. As shown in fig. 6, in the embodiment of the present invention, the ultrasonic generating assembly 10 in the local erasing apparatus of the lcd handwriting board is located at the erasing end 100 of the writing and erasing pen, and the backing layer 13, the ultrasonic generator 12 and the matching layer 11 are sequentially disposed along the direction from the pen body 300 to the erasing end, and further, a gel layer or a polymer elastomer layer (not shown) located at the outer side of the matching layer 11 may be further included.
In the liquid crystal writing board writing and erasing pen according to the embodiment of the present invention, for example, the erasing end 100 is detachably connected to the pen body 300, for example, detachably connected in various manners such as a screw thread, a snap, a magnetic attraction, and the like. The erasing end 100 of the embodiment of the present invention is located at one end of the pen body 300, but is not limited thereto. The erasing tip 100 can also be located at other positions of the pen body 300, such as the side of the pen body, and the like, which is not described in detail. The liquid crystal writing pad local erasing device and the liquid crystal writing pad writing and erasing pen according to the embodiments of the present invention preferably further include a charging device connected to a power supply, the charging device may be, for example, accommodated in the pen body 300, or may extend from the outside of the pen body 300, or may be located at a connection position between the pen body 300 and the erasing terminal 100 or the writing terminal 200, and the charging device is configured to provide a power supply for the ultrasonic generating assembly 10, so as to facilitate carrying and using of the entire writing and erasing pen. The liquid crystal writing pad writing and erasing pen according to the specific embodiment of the present invention further includes a switch, for example, for controlling a power supply provided to the ultrasound generating assembly 10, for example, an elastic switch is adopted, a long press is used to turn on the power supply, the long press is used to press the switch, the ultrasound generating assembly 10 continuously works, when the switch button is stopped, the ultrasound generating assembly 10 stops working, and when the elastic switch is at a static state or when the elastic switch is not subjected to an external force, the ultrasound generating assembly 10 is in a normally-off state.
Fig. 7 is a schematic diagram of writing on a liquid crystal writing tablet by using a liquid crystal writing tablet writing erasing pen according to an embodiment of the present invention, and fig. 8 is a schematic diagram of the texture of liquid crystal in the liquid crystal writing tablet in the state shown in fig. 7. Referring to fig. 7 and 8, the liquid crystal writing pad according to the embodiment of the invention uses, for example, polymer dispersed cholesteric liquid crystal with bistable property, when the liquid crystal layer is pressed by the pen tip of the writing and erasing pen, the liquid crystal layer at the pressed position changes from a scattering state to a reflecting state, and the color at the bottom of the liquid crystal writing pad is reflected into human eyes to display the written characters.
Fig. 9 is a schematic diagram of a liquid crystal writing tablet for performing partial erasing on the liquid crystal writing tablet by using the liquid crystal writing tablet erasing pen according to the embodiment of the present invention, and fig. 10 is a schematic diagram of the texture of liquid crystal in the liquid crystal writing tablet in the state shown in fig. 9. Referring to fig. 9 and 10, when the local part of the liquid crystal handwriting board according to the embodiment of the invention needs to be erased, the erasing end of the writing and erasing pen of the liquid crystal handwriting board is aligned to the part needing to be erased, the switch is turned on, so that the ultrasonic generating assembly 10 in the local liquid crystal handwriting board erasing device emits ultrasonic waves, specifically, when a high-frequency alternating current is applied to the ultrasonic generator 12, the ultrasonic generator 12 can generate ultrasonic waves with the same frequency and the ultrasonic waves emitted by the ultrasonic generator 12 have directionality, after the ultrasonic waves emitted by the ultrasonic generator 12 pass through the matching layer 11, the ultrasonic waves pass through the external substrate of the liquid crystal handwriting board and enter the liquid crystal layer, the liquid crystal layer is affected by the ultrasonic waves and is changed from a reflection state to a scattering state, the color at the bottom of the liquid crystal handwriting board is scattered and cannot be seen by an observer, so that characters or patterns originally written and displayed disappear, and other areas which are not erased by the writing and erasing pen are displayed as usual and are not influenced.
The external field used by the invention is ultrasonic in a sound field, and the arrangement of the liquid crystal is changed by virtue of the orientation effect of the ultrasonic on the liquid crystal, so that the liquid crystal is directly changed from a reflecting state to a scattering state to realize local erasing. The orientation of the liquid crystal by the sound field does not theoretically have heat and light transmission, the phenomenon of accelerated aging is fundamentally avoided, the manufacturing cost of the handwriting board is not increased, the human body is not damaged, and the method is a green, safe and convenient local erasing method. The liquid crystal writing pad local erasing device and the liquid crystal writing pad writing erasing pen provided by the invention can erase the local part of the liquid crystal writing pad by adopting ultrasonic waves, and are energy-saving, environment-friendly, safe and convenient to use.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (18)
1. The device for locally erasing the liquid crystal handwriting board is characterized by comprising a power supply, a driving circuit and an ultrasonic generating assembly, wherein the power supply is electrically connected with the driving circuit, the driving circuit is electrically connected with the ultrasonic generating assembly, the ultrasonic generating assembly comprises a matching layer, an ultrasonic generator and a backing layer which are sequentially stacked, and the matching layer is positioned on one side of the ultrasonic generating assembly, which is contacted with the liquid crystal handwriting board; the liquid crystal handwriting board local erasing device further comprises a gel layer or a polymer elastomer layer which is located on one side, away from the ultrasonic generator, of the matching layer, and when the liquid crystal handwriting board is locally erased, the gel layer or the polymer elastomer layer is tightly attached to the upper substrate of the liquid crystal handwriting board.
2. The device for locally erasing an LCD handwriting board according to claim 1, wherein the ultrasonic generator is one of a piezoelectric transducer, a magnetostrictive transducer, an electrostatic transducer or a combination thereof, and is used for emitting ultrasonic waves.
3. The device for locally erasing an lcd handwriting pad according to claim 1, wherein said matching layer is composed of a single layer or a multi-layer medium.
4. The apparatus of claim 3, wherein the matching layer is formed of a single layer medium having an acoustic impedance value that decreases gradually in a direction away from the ultrasonic generator.
5. The device for locally erasing an LCD handwriting pad according to claim 4, wherein the surface of the matching layer in contact with the LCD handwriting pad is a plane or a rough surface with microstructure protrusions.
6. The device for locally erasing on a liquid crystal writing pad of claim 5, wherein the protrusions of the microstructure are tetrahedron-shaped.
7. The apparatus for partially erasing a liquid crystal writing pad according to claim 3, wherein the matching layer is formed of a multi-layered medium having acoustic impedance values decreasing in a direction away from the ultrasonic generator.
8. The device for locally erasing an LCD handwriting board according to claim 1, wherein the material of the matching layer is selected from one or more of metal or metal oxide, inorganic nonmetal and high polymer material.
9. The device for locally erasing an lcd handwriting pad according to claim 8, wherein said metal is tungsten or aluminum, said metal oxide is tungsten oxide or aluminum oxide, and said inorganic nonmetal is silicon dioxide.
10. The device for locally erasing an LCD handwriting pad according to claim 8, wherein the polymer material comprises one or more of epoxy resin, polyester and polyvinyl chloride, or comprises a combination of one or more of epoxy resin, polyester and polyvinyl chloride polymer material and filler.
11. The device for locally erasing an lcd writing pad according to claim 10, wherein the filler is an inert metal powder or a non-metal powder.
12. The apparatus for locally erasing an lcd handwriting pad according to claim 1, wherein said ultrasonic generator is a single or a plurality of ultrasonic generator arrays combined in series or parallel.
13. The apparatus of claim 12, wherein the ultrasonic generator is shaped as a combination of one or more of a circle, a square, and a rectangle.
14. The device for locally erasing an lcd writing pad according to claim 1, wherein the backing layer is composed of one or more of epoxy, polyester, and polyvinyl chloride, and a solid filler of metal or nonmetal oxide, and the backing layer is used for absorbing the sound waves reflected at the interface.
15. A liquid crystal writing pad writing and erasing pen, characterized in that the liquid crystal writing pad writing and erasing pen comprises a writing end and an erasing end, wherein the erasing end comprises the liquid crystal writing pad local erasing device of any one of claims 1-14.
16. The liquid crystal writing pad writing and erasing pen according to claim 15, wherein the writing end and the erasing end are respectively located at two ends of the pen body.
17. The liquid crystal writing pad writing and erasing pen of claim 16, wherein the erasing end is detachably connected with the pen body.
18. The liquid crystal writing pad erasing pen of claim 17, further comprising a charging device connected to the power source.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811052227.5A CN110888248B (en) | 2018-09-10 | 2018-09-10 | Local erasing device for liquid crystal writing board and writing erasing pen for liquid crystal writing board |
| PCT/CN2019/103924 WO2020052455A1 (en) | 2018-09-10 | 2019-09-02 | Selectively erasing device and writing-erasing pen for liquid crystal writing board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811052227.5A CN110888248B (en) | 2018-09-10 | 2018-09-10 | Local erasing device for liquid crystal writing board and writing erasing pen for liquid crystal writing board |
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| Publication Number | Publication Date |
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| CN110888248A CN110888248A (en) | 2020-03-17 |
| CN110888248B true CN110888248B (en) | 2020-11-27 |
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| CN201811052227.5A Active CN110888248B (en) | 2018-09-10 | 2018-09-10 | Local erasing device for liquid crystal writing board and writing erasing pen for liquid crystal writing board |
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| Country | Link |
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| CN (1) | CN110888248B (en) |
| WO (1) | WO2020052455A1 (en) |
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| US11715321B2 (en) | 2021-05-13 | 2023-08-01 | Apple Inc. | Geometric structures for acoustic impedance matching and improved touch sensing and fingerprint imaging |
| CN114840075A (en) * | 2022-04-06 | 2022-08-02 | 华为技术有限公司 | Stylus and terminal equipment |
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| WO2020052455A1 (en) | 2020-03-19 |
| CN110888248A (en) | 2020-03-17 |
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