CN112305802B - Magnetic local erasing liquid crystal writing pad - Google Patents
Magnetic local erasing liquid crystal writing pad Download PDFInfo
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- CN112305802B CN112305802B CN201910712249.8A CN201910712249A CN112305802B CN 112305802 B CN112305802 B CN 112305802B CN 201910712249 A CN201910712249 A CN 201910712249A CN 112305802 B CN112305802 B CN 112305802B
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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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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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
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
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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
- G06F3/03—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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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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
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
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Abstract
The invention discloses a magnetic local erasing liquid crystal handwriting board. The magnetic force local erasing liquid crystal handwriting board comprises a base, a flexible transparent substrate layer and a liquid crystal polymer layer clamped by the base and the flexible transparent substrate layer, wherein the base and the flexible transparent substrate layer are parallel to each other and are arranged oppositely, a first conducting layer is formed on the inner side of the base, a second conducting layer is formed on the inner side of the flexible transparent substrate layer, the first conducting layer and the second conducting layer are electrically connected with an external driving circuit, and the magnetic force local erasing liquid crystal handwriting board further comprises a magnetic induction functional layer located between the liquid crystal polymer layer and the first conducting layer. The magnetic local erasing liquid crystal handwriting board has the advantages of convenient erasing operation, low cost and no erasing trace residue.
Description
Technical Field
The invention relates to the technical field of liquid crystal application, in particular to a magnetic local erasing liquid crystal handwriting board.
Background
At present, in the fields of education, business application and the like, the liquid crystal handwriting board is more and more widely applied, and the performance requirements of the liquid crystal handwriting board promote the continuous development of the liquid crystal handwriting board technology and the updating of products. The first generation of handwriting boards are digital boards, the production equipment is expensive and difficult to master, and handwriting cannot be accurately controlled; with the rapid development of display technology, a second generation capacitive screen panel emerges, which utilizes the static electricity of a human body to realize touch operation, has sensitive touch effect, but cannot perform screen touch operation after wearing gloves, cannot perform fine operation even if being matched with a professional touch pen, and has unsatisfactory writing experience; as a third generation handwriting board product, the flexible liquid crystal handwriting board has the advantages that the comprehensive performance is greatly improved, based on pressure-sensitive operation, a user can control the pressure of a pen point to change the thickness of a stroke when writing and drawing, the drawing effect close to paper and the coherent experience of writing are achieved, a professional stylus is not needed, and colored handwriting can be easily written by one pencil or other hard objects. The flexible liquid crystal handwriting board belongs to active display, does not need a backlight source and a polaroid, greatly reduces the difficulty and cost of the production process, and can realize monochrome and color display.
Most of the currently marketed liquid crystal handwriting boards are erased by applying power, and the general structure of the handwriting boards is as shown in fig. 1, where fig. 1 is a schematic cross-sectional structure of a liquid crystal handwriting board in the prior art, the liquid crystal handwriting board in the prior art includes an upper substrate 1, a lower substrate 2, and a liquid crystal layer 5 located between the upper substrate 1 and the lower substrate 2, an upper electrode 3 is disposed inside the upper substrate 1, and a lower electrode 4 is disposed inside the lower substrate 2, when the liquid crystal handwriting board needs to be erased, a certain voltage difference is applied to the upper electrode 3 and the lower electrode 4 by a driving circuit 6 electrically connected to the upper electrode 3 and the lower electrode 4, so as to implement the overall erasing of the liquid crystal handwriting board, but not implement the partial erasing of the liquid crystal handwriting board. At present, many manufacturers have studied the local erase technique without any loss, and the most common methods are the following three methods: 1. the thickness of the liquid crystal polymer layer is compressed, and the local electric field intensity is improved; 2. the thermal erasing technology is used for heating the liquid crystal to a clearing point and then cooling the liquid crystal to normal temperature, so that the handwriting disappears; 3. and a row-column matrix, wherein the conductive film ITO is etched into rows, the upper ITO and the lower ITO are vertically attached to form a row-column matrix, and the row-column intersection points can be erased under the control of a driving device. The method 1 has the problems of dark handwriting, large erasing force, incomplete erasing and the like; the method 2 has the problems that the heat transfer rate is slow, the wiping within 2 seconds cannot be realized, the scalding hidden danger exists, and the energy consumption is large; the method 3 has the problems of high cost, residual handwriting, mistaken erasing and the like; the three methods only realize the productization by the method 1, and can only be applied to occasions with low erasing requirements, such as a children scrawling drawing board.
In summary, no local erasing technology capable of being applied to a large-size handwriting board exists in the current market, and the breakthrough of the technology is the key point of the wide application of the liquid crystal handwriting board to the educational intelligent electronic consumer goods market.
Disclosure of Invention
The invention aims to provide a magnetic local erasing liquid crystal handwriting board which is convenient to erase and operate, low in cost and free of erasing trace residues, aiming at the technical problems in the prior art.
The invention adopts the following technical scheme:
a magnetic local-erasing liquid crystal writing pad, comprising: the liquid crystal handwriting board comprises a base, a flexible transparent substrate layer and a liquid crystal polymer layer clamped by the base and the flexible transparent substrate layer, wherein the base and the flexible transparent substrate layer are parallel to each other and are arranged oppositely, a first conducting layer is formed on the inner side of the base, a second conducting layer is formed on the inner side of the flexible transparent substrate layer, the first conducting layer and the second conducting layer are electrically connected with an external driving circuit, and the magnetic force local erasing liquid crystal handwriting board further comprises a magnetic induction functional layer located between the liquid crystal polymer layer and the first conducting layer.
Preferably, the magnetically inducible functional layer comprises magnetic particles, a carrier fluid and an additive.
Preferably, the magnetic induction functional layer comprises a plurality of mutually independent spatial structures, and each spatial structure is filled with a mixture of the magnetic particles, the carrier liquid and the additive.
Preferably, the spatial structure is a cylinder, a triangular prism, a quadrangular prism, an elliptic cylinder or a cylinder spatial structure with a bottom surface of other polygons.
Preferably, the magnetically inducible functional layer comprises a polymer and a plurality of capsules in which the mixture of magnetic particles, carrier liquid and additive is collectively contained, the plurality of capsules being dispersed in the polymer.
Preferably, the capsules have a diameter size in the range of 1-50 μm.
Preferably, the plurality of capsules have capsule walls made of a material selected from the group consisting of D-110, D-120, D-140, D-160, HMI, TDI, IPDI, N75, N3390 in isocyanates or ethylenediamine, butanediamine, hexanediamine, octanediamine, decanediamine, ethylamine, triethylenetetramine, triethanolamine, triethylamine, diethylenetriamine, tetraethylenepentamine in organic amines or derivatives thereof.
Preferably, the polymer comprises one or more of gelatin, gum arabic, urea-formaldehyde resins, melamine resins, polyurea-formaldehydes, phenolic resins, epoxy resins, vinyl or episulfide, methyl methacrylate, ene sulfone, and diazo polymers.
Preferably, the material of the magnetic particles comprises Fe 3 O 4 、Fe 3 N and one or more of Fe, co, ni, and alloys thereof.
Preferably, the carrier liquid comprises one or more of silicone oil, water, ethylene glycol, polyester, polyether, synthetic hydrocarbon oil.
Preferably, the additive comprises one or more of oleic acid, polyethylene glycol, nano lithium magnesium silicate, silicon dioxide.
The magnetic local erasing liquid crystal handwriting board has the advantages of convenient erasing operation, low cost and no erasing trace residue.
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 cross-sectional view of a prior art liquid crystal writing pad;
FIG. 2 is a schematic cross-sectional view of a magnetic local erasing liquid crystal writing pad according to a first embodiment of the present invention;
FIG. 3 is an equivalent circuit schematic of FIG. 2;
FIG. 4 is a schematic diagram of a plurality of mutually independent spatial structures in a magnetic local erasure liquid crystal writing pad according to a first embodiment of the present invention;
FIG. 5 is another schematic diagram of a plurality of mutually independent spatial structures in the magnetic local erasure liquid crystal writing pad according to the first embodiment of the present invention;
FIG. 6 is an example of steps for forming a plurality of mutually independent spatial structures in a magnetic local erasure liquid crystal writing pad according to a first embodiment of the present invention;
fig. 7 is a schematic cross-sectional structure diagram of a magnetic local erasing liquid crystal writing pad according to a second embodiment of the present invention.
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 first embodiment:
FIG. 2 is a schematic cross-sectional view of a magnetic local erasing liquid crystal writing pad according to a first embodiment of the present invention. As shown in fig. 2, the magnetic local erasing liquid crystal writing pad of the present embodiment includes: the liquid crystal handwriting board comprises a base 10, a flexible transparent substrate layer 20 and a liquid crystal polymer layer 30 clamped by the base 10 and the flexible transparent substrate layer 20 together, wherein the base 10 and the flexible transparent substrate layer 20 are parallel to each other and are arranged oppositely, a first conducting layer 11 is formed on the inner side of the base 10, a second conducting layer 21 is formed on the inner side of the flexible transparent substrate layer 20, the first conducting layer 11 and the second conducting layer 21 are both electrically connected with an external driving circuit 50, and the magnetic local erasing liquid crystal handwriting board further comprises a magnetic induction functional layer 40 located between the liquid crystal polymer layer 30 and the first conducting layer 11.
Fig. 3 is an equivalent circuit schematic of fig. 2. Referring to fig. 2 and 3, in the present embodiment, magnetic particles 41, carrier liquid 42 and additives (not shown) are included in the magnetic induction functional layer 40. As shown in fig. 2, in the present embodiment, the magnetism-inducing functional layer 40 includes a plurality of mutually independent spatial structures, which are closely arranged and mutually independent, and in each spatial structure, a mixture of magnetic particles 41, carrier liquid 42 and additives is distributed. In fig. 2, when a local area of the magnetic local erasing liquid crystal writing pad of this embodiment needs to be erased, when the magnetic device 60 is close to the erasing area, the magnetic particles 41 in the plurality of spatial structures of the area are acted by the magnetic force to form a mutually ordered close arrangement structure. As shown in fig. 2 in the region directly below the magnetic device 60, at least some of the magnetic particles 41 arranged in close contact with each other constitute a conductor having a certain resistance. Fig. 3 is an equivalent circuit diagram of fig. 2, and as shown in fig. 3, when a voltage (lower than a threshold voltage) is applied between the first conductive layer 11 and the second conductive layer 12, the magnetic particles 41 in the magnetically-induced functional layer 40 in the region are changed from disordered arrangement to ordered close arrangement, the relative dielectric constant thereof increases, and thus the electric field intensity corresponding to the magnetically-induced functional layer 40 decreases. Since the total electric field intensity applied to the liquid crystal polymer layer 30 and the magnetically inducible functional layer 40 in common is not changed, the electric field intensity between the magnetically inducible functional layers 40 is reduced, and accordingly the electric field intensity applied to the liquid crystal polymer layer 30 is significantly increased, so that the liquid crystal molecules in the liquid crystal polymer layer in the region directly below the magnetic means 60 are locally erased by the large electric field intensity. If the liquid crystal writing pad needs to be erased completely, a voltage larger than the threshold voltage may be applied between the first conductive layer 11 and the second conductive layer 12.
In this embodiment, preferably, after the magnetic particles 41 in the region directly below the magnetic device 60 are uniformly and orderly arranged, they are arranged into a bar structure extending along the longitudinal direction, the lower end of the bar structure is in contact with the first conductive layer 11, and the upper end thereof extends to the edge of the liquid crystal polymer layer 30. In this region, the first conductive layer 11 is conducted along the stripe structure to the edge of the liquid crystal polymer layer 30, which corresponds to the decrease of the distance between the first conductive layer 11 and the second conductive layer 12 in the region directly below the magnetic means 60, according to the formula
E＝U/d
It can be seen that when the voltage U between the first conductive layer 11 and the second conductive layer 12 is not changed, the approach of the magnetic device 60 of the liquid crystal writing pad is equivalent to reducing the thickness d between the first conductive layer 11 and the second conductive layer 12 in the area, so that the electric field intensity E applied to the liquid crystal polymer layer therebetween is significantly increased, and thus the liquid crystal molecules in the liquid crystal polymer layer in the area directly below the magnetic device 60 are subjected to a larger electric field intensity to be locally erased. Similarly, if it is necessary to erase all of the liquid crystal writing pad, a voltage higher than the threshold voltage may be applied between the first conductive layer 11 and the second conductive layer 12.
In the embodiment of the present invention, the liquid crystal in the liquid crystal polymer layer 30 is a cholesteric liquid crystal having a bistable characteristic, when the pitch size is equal to the visible light wavelength, the liquid crystal polymer layer 30 selectively reflects the incident light, the light with the specific wavelength corresponding to the pitch is reflected, the light with other wavelengths is transmitted, and finally the light is coated on the dye layer below the substrate 10 or absorbed by the back plate below the substrate 10, which is in a reflective state. When a low voltage is applied to the reflective state, the director of the liquid crystal molecules is parallel to the direction of the electric field (for positive liquid crystals), and the helical axis is uncoiled to some extent. After the electric field is removed, liquid crystal molecules are redirected under the combined action of the chiral twisting force, the polymer grid anchoring force, the substrate inner surface anchoring force and the elastic force in the liquid crystal system, and the liquid crystal molecules are changed into a multi-domain weak scattering state. In this state, the incident light is mostly scattered forward into the substrate 10 and then absorbed, and the liquid crystal handwriting board assumes a blackboard state. At this time, the writing pen is used to press the writing pad, and bright writing is left where the pressure is reached. For the area where the handwriting is written on the liquid crystal writing board, if the local part of the area needs to be erased, the magnetic device 60 is close to the erasing area, the electric field intensity applied to the liquid crystal polymer layer in the area is obviously increased, when the electric field intensity of the liquid crystal molecules in the area exceeds a threshold value, the liquid crystal molecules are deviated from the original ordered arrangement under the action of the electric field and are changed into a disoriented multi-domain scattering state, so that the writing handwriting in the area is erased, and the other areas which are not close to the magnetic device 60 still keep the reflection state of the displayed handwriting because the electric field intensity does not exceed the driving voltage of the scattering state, so that the principle that the magnetic local erasing liquid crystal writing board realizes the local erasing of the liquid crystal writing board is adopted by the magnetic local erasing liquid crystal writing board.
In this embodiment, the spatial structure may be a cylinder, a triangular prism, a quadrangular prism, an elliptic cylinder, or a cylinder spatial structure whose bottom surface is another polygon. Fig. 4 is a schematic diagram of a plurality of mutually independent spatial structures in the magnetic local erasure liquid crystal writing pad of the embodiment, and the spatial structure shown in fig. 4 is a closely-arranged cylindrical structure with a regular hexagonal bottom surface. Fig. 5 is another schematic view of a plurality of mutually independent spatial structures in the magnetic local erasure liquid crystal writing pad according to the embodiment of the present invention, and the spatial structure shown in fig. 5 is a column structure with a square bottom surface and closely arranged. However, the present invention is not limited to this, and the mutually independent spatial structures may also be a column or a column-like structure with a bottom surface having other pattern structures, as long as the spatial structures are mutually independent and can respectively contain the mixture of the magnetic particles 41, the carrier liquid 42 and the additive, and the description thereof is omitted.
Fig. 6 is an exemplary implementation of the steps of forming a plurality of mutually independent spatial structures in a magnetic partial erasure lcd handwriting pad according to the first embodiment of the present invention. As shown in fig. 6, the magnetism-inducing functional layer 40 in the present embodiment may be formed, for example, by the following steps: step S1, coating photoresist on one side of a substrate 10 with a first conducting layer 11, and forming an isolation structure (the structure is a wall body structure with an isolation effect) among a plurality of mutually independent space structures after carrying out local exposure, development and etching on the photoresist layer; then, step S2 is performed, in which a mixture of the magnetic particles 41, the carrier liquid 42 and the additive is coated to fill the space structure formed in step S1; then, step S3 is performed, in which the magnetic particles 41, the carrier liquid 42 and the additives are mixed and appropriately volatilized; then, step S4 is performed to seal the top of the mixture of the magnetic particles 41, the carrier liquid 42 and the additives filled in the space structure, for example, the liquid crystal polymer layer 30 may be directly attached to the top for sealing, or a film layer may be additionally used for sealing the top and then the liquid crystal polymer layer 30 is attached to the top. In this embodiment, the photoresist may be selected from a poly-cinnamate (polyester) and a cyclized rubber, or may be a photoresist using diazoquinone as a photosensitive compound and a phenolic resin as a base material, or may be a polymer of an epoxy resin, a vinyl or an episulfide, or a methyl methacrylate, an olefin sulfone, and a diazo polymer (such as PMMA), as long as the photoresist can form mutually independent spatial structures by photolithography, and the details are not repeated.
In the present embodiment, preferably, the magnetic particle 41 material includes Fe 3 O 4 、Fe 3 N and one or more of Fe, co, ni, and alloys thereof. Carrier liquid 42 comprises one or more of silicone oil, water, glycol, polyester, polyether, synthetic hydrocarbon oil. The additive comprises oleic acid, polyethylene glycol, nano lithium magnesium silicate and silicon dioxide (SiO) 2 ) One or more of.
In the present embodiment, the first conductive layer 11 and the second conductive layer 21 are selected from one or more of ITO, graphene, nano silver, or other metal conductive layers. The first conductive layer 11 may be selected from a transparent conductive film or an opaque conductive film, and the second conductive layer 21 is selected from a transparent conductive film. The liquid crystal polymer layer 30 includes a polymer and liquid crystals dispersed in the polymer. Preferably, the liquid crystal polymer layer further comprises a plurality of spacers dispersed in the polymer layer for defining a thickness of the liquid crystal polymer layer.
In the present embodiment, the magnetic device 60 may be a permanent magnet or an electromagnetic coil, and the magnetic device 60 is not particularly limited as long as it is a generator capable of generating a magnetic force. Magnetic means 60 is preferably integrated or housed, for example, in an lcd writing tablet erasing pen, an erasing pad or other erasing means, and may be located, for example, at the other end of the writing end of an lcd writing tablet writing pen, for writing and erasing use.
The magnetic local erasing liquid crystal handwriting board is convenient to erase and operate, low in cost, free of erasing trace residues and beneficial to popularization and application.
Second embodiment:
the same parts of this embodiment as those of the first embodiment are not described again, but the difference is that in this embodiment, the magnetically inducing functional layer 40 is a structure of dispersing capsules in a polymer. FIG. 7 is a schematic cross-sectional view of a magnetic local erasing liquid crystal writing pad according to a second embodiment of the present invention. As shown in fig. 7, in the present embodiment, the magnetism-inducing functional layer 40 includes a polymer P1 and a plurality of capsules C1 dispersed in the polymer P1, and a mixture of magnetic particles 41, a carrier liquid 42, and an additive (not shown) is collectively contained in the plurality of capsules C1.
In this embodiment, the capsule C1 preferably has a diameter size in the range of 1-50 μm. Preferably, the capsule C1 has a capsule wall made of a material selected from the group consisting of D-110, D-120, D-140, D-160, HMI, TDI, IPDI, N75, N3390 in the isocyanate group, or ethylenediamine, butanediamine, hexanediamine, octanediamine, decanediamine, ethylamine, triethylenetetramine, triethanolamine, triethylamine, diethylenetriamine, tetraethylenepentamine in the isocyanate group or in the organic amine group.
In this embodiment, the polymer P1 preferably includes one or more of gelatin, gum arabic, urea-formaldehyde resin, melamine resin, polyurea formaldehyde, phenolic resin, epoxy resin, vinyl or episulfide, methyl methacrylate, ene sulfone, and diazo polymer, and is preferably selected from one or more of photoresists, which are the same as those in the first embodiment and are not described again.
When the magnetic local erasing liquid crystal writing pad of the embodiment needs to erase a local area, and the magnetic device 60 is close to the erasing area, the magnetic particles 41 in the capsules C1 in the area are acted by the magnetic force to form a mutually ordered close arrangement structure. As shown in fig. 7 in the region directly below the magnetic device 60, at least some of the magnetic particles 41 arranged in close contact with each other constitute a conductor having a certain resistance. When a voltage (lower than a threshold voltage) is applied between the first conductive layer 11 and the second conductive layer 12, the magnetic particles 41 in the magnetism-inducing functional layer 40 in this region are changed from a disordered arrangement to an ordered close arrangement, the relative dielectric constant thereof increases, and thus the electric field intensity corresponding to the magnetism-inducing functional layer 40 decreases. Since the total electric field intensity applied to the liquid crystal polymer layer 30 and the magnetically inducing functional layer 40 in common is not changed, the electric field intensity corresponding to the magnetically inducing functional layer 40 is decreased, and accordingly the electric field intensity applied to the liquid crystal polymer layer 30 is significantly increased, and thus the liquid crystal molecules in the liquid crystal polymer layer located at the region directly below the magnetic means 60 are locally erased by the large electric field intensity. If the liquid crystal writing pad needs to be erased completely, a voltage larger than the threshold voltage may be applied between the first conductive layer 11 and the second conductive layer 12.
In the above embodiments of the present invention, only the magnetically inducing functional layer 40 is illustrated, but not limited thereto, the magnetically inducing functional layer 40 may also be a layer or a multilayer film made of a magnetically inducing material, and the specific structure is not limited to the above embodiments, as long as the magnetic field induction can be realized, the electric field intensity applied to the local liquid crystal polymer layer 30 is increased, and the local erasing function of the liquid crystal writing pad can be realized. The magnetic induction functional layer 40 and the liquid crystal polymer layer 30 in the invention are relatively independent and do not affect each other, the parameters are easy to adjust to achieve the best driving effect, the erasing operation is convenient, the cost is low, and no erasing trace residue exists. The problems of large erasing force, residual traces, high cost, dark handwriting, untimely response and the like in the local erasing method in the prior art are solved.
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 taken 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 (12)
1. A magnetic force local erasing liquid crystal writing pad, characterized in that the magnetic force local erasing liquid crystal writing pad comprises: the magnetic local erasing liquid crystal handwriting board comprises a substrate, a flexible transparent substrate layer and a liquid crystal polymer layer clamped by the substrate and the flexible transparent substrate layer together, wherein the substrate and the flexible transparent substrate layer are parallel and opposite to each other, a first conducting layer is formed on the inner side of the substrate, a second conducting layer is formed on the inner side of the flexible transparent substrate layer, the first conducting layer and the second conducting layer are both electrically connected with an external driving circuit, and the magnetic local erasing liquid crystal handwriting board further comprises a magnetic induction functional layer positioned between the liquid crystal polymer layer and the first conducting layer;
the magnetic induction functional layer comprises magnetic particles, carrier liquid and additives;
the magnetic induction functional layer comprises a plurality of mutually independent space structures, and each space structure is filled with a mixture of the magnetic particles, the carrier liquid and the additive.
2. The magnetic local erasure lcd writing pad of claim 1, wherein the spatial structure is a cylinder, a triangular prism, a quadrangular prism, an elliptical cylinder or a cylinder with a polygonal bottom surface.
3. Magnetic local-erasure lc writing pad of claim 1 or 2, wherein the material of the magnetic particles comprises Fe 3 O 4 、Fe 3 N and one or more of Fe, co, ni, and alloys thereof.
4. The magnetic partial erasure liquid crystal writing pad of claim 1 or 2, wherein the carrier liquid comprises one or more of silicone oil, water, glycol, polyester, polyether, synthetic hydrocarbon oil.
5. The magnetic local erasure lcd writing pad of claim 1 or 2, wherein the additives include one or more of oleic acid, polyethylene glycol, nano-lithium magnesium silicate, silicon dioxide.
6. A magnetic local erasing liquid crystal writing pad is characterized by comprising: the magnetic local erasing liquid crystal handwriting board comprises a substrate, a flexible transparent substrate layer and a liquid crystal polymer layer clamped by the substrate and the flexible transparent substrate layer together, wherein the substrate and the flexible transparent substrate layer are parallel and opposite to each other, a first conducting layer is formed on the inner side of the substrate, a second conducting layer is formed on the inner side of the flexible transparent substrate layer, the first conducting layer and the second conducting layer are both electrically connected with an external driving circuit, and the magnetic local erasing liquid crystal handwriting board further comprises a magnetic induction functional layer positioned between the liquid crystal polymer layer and the first conducting layer;
the magnetic induction functional layer comprises magnetic particles, carrier liquid and additives;
the magnetically inducing functional layer includes a polymer and a plurality of capsules in which a mixture of the magnetic particles, the carrier liquid, and the additive are collectively contained, the plurality of capsules being dispersed in the polymer.
7. The magnetic local erasure lc writing pad of claim 6, wherein said plurality of capsules have a diameter size in the range of 1-50 μm.
8. The magnetic partial erasure liquid crystal writing pad of claim 6, wherein the plurality of capsules have capsule walls made of a material selected from D-110, D-120, D-140, D-160, HMI, TDI, IPDI, N75, N3390 of isocyanates or ethylenediamine, butanediamine, hexanediamine, octanediamine, decanediamine, ethylamine, triethylenetetramine, triethanolamine, triethylamine, diethylenetriamine, tetraethylenepentamine of isocyanate derivatives or organic amines.
9. The magnetic partial erase liquid crystal writing pad of claim 6, wherein the polymer includes one or more of gelatin, gum arabic, urea-formaldehyde, melamine, polyurea-formaldehyde, phenolic, epoxy, vinyl or episulfide, methyl methacrylate, ene sulfone, and diazo polymers.
10. Magnetic local erasure lc writing pad according to any of claims 6-9, wherein the material of the magnetic particles comprises Fe 3 O 4 、Fe 3 N and one or more of Fe, co, ni, and alloys thereof.
11. The magnetic local erasure lcd writing pad of any one of claims 6-9, wherein the carrier fluid comprises one or more of silicone oil, water, glycol, polyester, polyether, synthetic hydrocarbon oil.
12. Magnetic localized erasure lc writing pad according to any of claims 6 to 9, wherein the additives comprise one or more of oleic acid, polyethylene glycol, nano lithium magnesium silicate, silica.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4701024A (en) * | 1985-12-02 | 1987-10-20 | Dai-Ichi Seiko Kabushiki Kaisha | Liquid crystal material including magnetic particles and method of producing the same |
| US6419498B1 (en) * | 2000-01-26 | 2002-07-16 | Kabushiki Kaisha Pilot | Magnetic material-inverting display panel |
| JP4089808B2 (en) * | 2001-12-25 | 2008-05-28 | ケミテック株式会社 | Erasable microcapsule magnetophoretic display sheet |
| US20120268420A1 (en) * | 2007-07-31 | 2012-10-25 | Duane Marhefka | Writing tablet information recording device |
| CN206378662U (en) * | 2017-01-13 | 2017-08-04 | 深圳市好写科技有限公司 | Selective erase liquid crystal display device |
| CN109749756B (en) * | 2017-11-01 | 2022-01-11 | 江苏集萃智能液晶科技有限公司 | Liquid crystal composite material, preparation method and liquid crystal handwriting device thereof |
| CN107844218B (en) * | 2017-11-14 | 2021-04-30 | 深圳市唯酷光电有限公司 | Liquid crystal writing pad with local erasing function, writing pen and liquid crystal blackboard |
| CN108828821B (en) * | 2018-06-28 | 2021-01-12 | 广州林登科技有限公司 | Liquid crystal writing device capable of being locally erased and local erasing method |
| CN109901331A (en) * | 2019-03-20 | 2019-06-18 | 深圳市恒开源电子有限公司 | Liquid crystal handwriting pad and liquid crystal tablet system |
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