CN109932834B - Device for locally erasing liquid crystal handwriting board and forming method thereof - Google Patents
Device for locally erasing liquid crystal handwriting board and forming method thereof Download PDFInfo
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- CN109932834B CN109932834B CN201711349246.XA CN201711349246A CN109932834B CN 109932834 B CN109932834 B CN 109932834B CN 201711349246 A CN201711349246 A CN 201711349246A CN 109932834 B CN109932834 B CN 109932834B
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Abstract
The invention discloses a device for locally erasing a liquid crystal handwriting board and a forming method thereof. The device for locally erasing the liquid crystal handwriting board comprises a liquid crystal handwriting board and an erasing pen, wherein the liquid crystal handwriting board comprises: a substrate; a first conductive layer and a layer of infrared absorbing material, the first conductive layer and the layer of infrared absorbing material being substantially uniformly sized on the substrate; a liquid crystal layer; a second conductive layer; a flexible transparent substrate; the first conducting layer and the second conducting layer are transparent conducting layers, the second conducting layer is formed on the flexible transparent base material, the base and the flexible transparent base material clamp the liquid crystal layer together to form a liquid crystal box of the liquid crystal handwriting board, and the erasing pen comprises an infrared emission light source and a control switch. The device for locally erasing the liquid crystal handwriting board realizes local erasing by adopting non-contact photo-thermal conversion, has high erasing efficiency, is convenient to use, saves energy and is low in cost.
Description
Technical Field
The invention relates to the technical field of liquid crystal display application, in particular to a device for locally erasing a liquid crystal handwriting board and a forming method thereof.
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; the flexible liquid crystal handwriting board is used as a third-generation handwriting board product, the comprehensive performance of the flexible liquid crystal handwriting board is greatly improved, based on pressure type operation, a user can control the pressure of a pen point to change the thickness of a stroke when writing and drawing, the flexible liquid crystal handwriting board has the drawing effect close to paper and the coherent experience of writing, a professional stylus is not needed, and a pencil or other hard objects can easily write color handwriting. 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.
At present, all commercially available liquid crystal handwriting boards are completely erased by electrifying, and a partial erasing product does not exist, so that the liquid crystal handwriting boards are greatly limited to enter a huge education market. Theoretically, the local erasing technique is to realize the reorientation of liquid crystal molecules in local areas and change the liquid crystal molecules into a disordered weak scattering state. The patent right is to disclose a semiconductor heat erasing technique in chinese utility model patent with application number CN201620117008.0 that Shenzhen wei cool photoelectricity limited company proposed, use a semiconductor block to heat liquid crystal to isotropic liquid, the liquid crystal exists with the multidomain structure stability of weak scattering after the cooling, just so realized the transformation from plane reflection attitude to burnt awl scattering attitude, realized the purpose that the writing erased promptly, but semiconductor heat transfer rate is slow, can't realize erasing within 2 seconds, and there is the scald hidden danger, the problem that the energy consumption is big, the breakthrough of low energy consumption, quick local erasing technique is the key place that the liquid crystal handwriting board is widely applied to education class intelligence electronic consumer goods market.
Disclosure of Invention
The present invention is directed to a handwriting pad apparatus for quickly implementing partial erasing and a method for forming the same, which solve the above technical problems in the prior art.
The invention adopts the following technical scheme:
a device for locally erasing a liquid crystal writing pad, comprising a liquid crystal writing pad and an erasing pen, the liquid crystal writing pad comprising: a substrate; a first conductive layer and a layer of infrared absorbing material, the first conductive layer and the layer of infrared absorbing material being substantially uniformly sized on the substrate; a liquid crystal layer; a second conductive layer; a flexible transparent substrate; the first conducting layer and the second conducting layer are transparent conducting layers, the second conducting layer is formed on the flexible transparent base material, the base and the flexible transparent base material clamp the liquid crystal layer together to form a liquid crystal box of the liquid crystal handwriting board, and the erasing pen comprises an infrared emission light source and a control switch.
Preferably, the first conductive layer is disposed between the substrate and the infrared absorbing material layer.
Preferably, the infrared absorbing material layer is disposed between the substrate and the first conductive layer.
Preferably, the first conductive layer and the second conductive layer are respectively selected from at least one of an ITO layer, a nano-silver wire layer, and a graphene layer.
Preferably, the dye-based touch screen further comprises a dye layer positioned on one side of the substrate, which is far away from the first conductive layer, wherein the dye layer is coated on the substrate or attached to the substrate, and the color of the dye layer can be changed.
Preferably, the substrate is a material such as glass, PET, resin, etc. with a dye incorporated therein.
Preferably, the layer of infrared absorbing material is patterned.
Preferably, the erasing pen is integrated with a writing pen of the liquid crystal writing pad.
In addition, the invention also provides a forming method of the device for partially erasing the liquid crystal handwriting board, the device for partially erasing the liquid crystal handwriting board comprises a liquid crystal handwriting board and an erasing pen, and the forming method of the liquid crystal handwriting board comprises the following steps: s1, providing a substrate, and sequentially forming a first conductive layer and an infrared absorption material layer on the substrate, or sequentially forming an infrared absorption material layer and a first conductive layer on the substrate; s2, providing a flexible transparent substrate, and forming a second conducting layer on the flexible transparent substrate; s3, dropping a liquid crystal layer on the side of the substrate having the first conductive layer and the infrared absorption material layer after the step S1; s4, pressing the side of the flexible transparent substrate with the second conductive layer after the step S2 on the liquid crystal layer; s5, curing by ultraviolet irradiation after laminating to form a liquid crystal box of the liquid crystal handwriting board; and S6, driving the first conducting layer and the second conducting layer to a plane state by a high electric field, and then switching to a scattering state by a low-voltage electric field for writing.
Preferably, the infrared absorption material layer formed in step S1 is an organic dye, an inorganic metal fine particle, or a semiconductor nanoparticle.
Preferably, the step of locally erasing is: and opening a control switch of the erasing pen to enable the erasing pen to emit infrared light, and irradiating the infrared light to the area of the liquid crystal handwriting board needing local erasing to perform local erasing.
Preferably, the infrared light emitted by the erasing pen is near infrared light with the wavelength in the range of 780nm-2500 nm.
The local erasing handwriting board device provided by the invention realizes local erasing by adopting non-contact photo-thermal conversion, and has the advantages of high erasing efficiency, convenience in use, energy conservation and low cost.
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 cross-sectional view of a partial-erase tablet device in a reflective state in accordance with an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a partial-erasure tablet device according to an embodiment of the present invention in a weakly scattering state;
fig. 3 is a schematic cross-sectional view illustrating a partial erasing operation of the partial erasing tablet device according to an 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 liquid crystal writing pad device for partial erasing and the method for forming the same according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic cross-sectional structure diagram of a local erasing tablet device according to an embodiment of the present invention in a reflective state, fig. 2 is a schematic cross-sectional structure diagram of a local erasing tablet device according to an embodiment of the present invention in a scattering state, and fig. 3 is a schematic cross-sectional structure diagram of a local erasing tablet device according to an embodiment of the present invention in a local erasing state. Referring to fig. 1 to 3, a device for locally erasing a liquid crystal handwriting board according to an embodiment of the present invention includes a liquid crystal handwriting board and an erasing pen, where the liquid crystal handwriting board includes: a substrate 10; a first conductive layer 20 and an infrared absorbing material layer 30 disposed on the substrate 10; a liquid crystal layer 40; a second conductive layer 50; a flexible transparent substrate 60; the first conducting layer 20 and the second conducting layer 50 are transparent conducting layers, the second conducting layer 50 is formed on a flexible transparent substrate 60, the substrate 10 and the flexible transparent substrate 60 jointly clamp the liquid crystal layer 40 to form a liquid crystal box of the liquid crystal handwriting board, and the erasing pen comprises an infrared emission light source and a control switch.
In the embodiment of the present invention, preferably, the first conductive layer 20 is disposed between the substrate 10 and the infrared absorption material layer 30, but not limited thereto, and the infrared absorption material layer 30 may be directly disposed on the substrate 10 and then the first conductive layer 20 is disposed on the infrared absorption material layer 30 according to actual situations or needs, preferably, the first conductive layer 20 and the second conductive layer 50 are respectively disposed on the substrate 10 and one side of the flexible transparent substrate 60 close to the liquid crystal layer 40, that is, both are disposed on the inner side of the liquid crystal cell, and the first conductive layer 20 and the second conductive layer 50 are respectively selected from at least one of an ITO layer, a nano silver wire layer, and a graphene layer.
In an embodiment of the present invention, the display device further includes a dye layer 70 located on a side of the substrate 10 away from the first conductive layer 20, the dye layer 70 is coated on the substrate 10 or attached to the substrate 10, and the color of the dye layer 70 is changeable according to different display states or requirements, for example, a black dye coating is selected. However, the present invention is not limited to this, and the dye may be directly doped into the material of the substrate 10 to obtain the dye, and the specific doped dye component or color may also be adjusted and changed according to the actual requirement, for example, the substrate 10 is made of glass, PET, resin, etc. into which the dye is doped, but the main material component of the substrate itself is not limited to the glass, PET, resin, etc., and may be any material capable of playing a supporting role, and is not described in detail.
The erasing pen in the embodiment of the invention comprises an infrared emission light source and a control switch, wherein the infrared emission light source is, for example, an infrared LED, preferably, the infrared emission light source can emit near infrared light with a wavelength in a range of 780nm-2500nm, the corresponding infrared absorption material layer 30 absorbs the infrared light in the wave band to generate heat, the heat is transferred to the liquid crystal layer 40, liquid crystals in the liquid crystal layer 40 in an irradiated area are changed into isotropic liquid and then cooled down to enter a weakly scattering focal conic state, and fixed-point erasing of the handwriting is realized. In an embodiment of the present invention, the liquid crystal layer 40 is a polymer dispersed cholesteric liquid crystal having a bistable property, when the pitch size is equal to the wavelength of visible light, the liquid crystal layer 40 selectively reflects incident light, the specific wavelength is reflected, the light with the same direction of rotation as the pitch is transmitted through the liquid crystal layer 40, and the light with the opposite direction of rotation to the pitch is absorbed by a dye layer 70 (e.g., black dye) coated on the substrate 10, which is a reflective state, as shown in fig. 1. 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, the liquid crystal molecules are redirected under the combined action of the chiral twisting force, the polymer mesh anchoring force, the substrate inner surface anchoring force and the elastic force in the liquid crystal system, and become a multi-domain weak scattering state, as shown in fig. 2. In this state, the incident light is mostly scattered forward into the substrate 10, absorbed by the dye layer 70 (e.g., black dye) coated on the substrate 10, or absorbed by the dye doped inside the substrate 10, and the writing pad assumes a blackboard state. At this time, a pen is used to press the handwriting board, and bright writing is left where the pen is pressed. Aiming at an area where handwriting is written on the handwriting board, if the local part of the handwriting board needs to be erased, a control switch of an erasing pen is turned on, an infrared light emitting source emits near infrared light, the area is irradiated by the near infrared light at a fixed point, an infrared absorption material layer in the area absorbs the near infrared light and converts the near infrared light into heat which is transmitted to a liquid crystal layer 40, liquid crystal molecules in the area are subjected to intense thermal motion after absorbing heat, the liquid crystal molecules are changed into isotropic liquid after being deviated from original ordered arrangement, the liquid crystal molecules are naturally cooled at room temperature and then are changed into a disoriented multi-domain scattering state, and the area which is not subjected to near infrared illumination still keeps a reflection state for displaying the handwriting, as shown in figure 3, the principle that the local erasing of the liquid crystal handwriting board is realized by adopting near infrared control.
In an embodiment of the present invention, the infrared absorption material layer 30 may be disposed as a whole layer, or may be patterned, that is, the infrared absorption material layer 30 is divided into regions by etching or other processes, for example, in order to prevent heat from spreading to a region that does not need to be erased after the infrared absorption material layer 30 absorbs infrared light, the infrared absorption material layer 30 is patterned to form different region divisions, so as to block heat transfer between adjacent regions of different infrared absorption material layers, thereby enabling the erasing position to be more accurate and reliable. In an embodiment of the present invention, further, a thermal insulation material layer may be formed between different regions of the patterned infrared absorption material layer 30, so as to better block heat transfer between adjacent regions.
Preferably, in the embodiment of the present invention, the erasing pen and the writing pen of the liquid crystal writing pad may be integrated into a whole. For example, the erasing pen is installed at the other end of the writing pen, one end of the writing pen is used for writing during normal writing, if the erasing is needed, the erasing pen function at the other end is adopted, the control switch of the near-infrared light emitting light source is switched on to enable the erasing pen to emit near-infrared light, and the part needing to be erased can be erased through moving or continuous irradiation. For safety and power saving, the control switch in the erasing pen may be set to a static off-holding state, i.e., a state that is turned on after a switch button is pressed for a long time and turned off after the switch button is released, but is not limited thereto, and other control switches may be used.
In addition, the method for forming the device for locally erasing the liquid crystal writing pad according to the embodiment of the invention comprises the following steps: s1, providing a substrate 10, on which a first conductive layer 20 and an infrared absorption material layer 30 are sequentially formed, or on which an infrared absorption material layer 30 and a first conductive layer 20 are sequentially formed; s2, providing a flexible transparent substrate 60, and forming a second conductive layer 50 thereon; s3, dropping the liquid crystal layer 40 on the side of the substrate 10 having the first conductive layer 20 and the infrared absorbing material layer 30 after the step S1; s4, pressing the side of the flexible transparent substrate 60 with the second conductive layer 50 after the step S2 on the liquid crystal layer 40; s5, curing by ultraviolet irradiation after laminating to form a liquid crystal box of the liquid crystal handwriting board; s6, writing is performed by driving a high electric field between the first conductive layer 20 and the second conductive layer 50 to a planar state and then switching to a scattering state by a low voltage electric field.
In the embodiment of the present invention, the infrared absorption material layer 30 formed in step S1 is preferably an organic dye, an inorganic metal fine particle, or a semiconductor nanoparticle. For example, the infrared absorbing material layer 30 is one or more selected from metal fine particles such as cyanine type, polyaniline, azo type, arylmethane type, nickel, tungsten, cobalt, and the like, and tin dioxide semiconductor nanoparticles. The preparation techniques for forming the infrared absorption material layer 30 mainly include coating, physical vapor deposition, chemical vapor deposition, and the like, and different film forming techniques can be selected according to different materials, which are not described in detail.
In the specific embodiment of the present invention, polyaniline is selected as the infrared absorption material layer, and the step of forming the infrared absorption material layer 30 in step S1 is as follows: weighing a certain amount of polyaniline, adding an organic solvent N-methylpyrrolidone, stirring and mixing to obtain a uniform solution, adding curable matrix resin into the solution, stirring, rotationally coating the dispersed near-infrared absorption coating material into a thin layer, heating in a vacuum oven, and after the solvent is fully volatilized, obtaining a dry film layer with uniform thickness, wherein the temperature is controlled below 120 ℃. Wherein the ratio of the mass of the polyaniline to the mass of the matrix resin is between 0.1 and 3, and the thickness of the dry film layer is less than 1 μm. The matrix resin comprises high molecular polymers which are easy to form films, such as epoxy resin, acrylate resin, polyurethane, alkyd resin, vinyl resin, fluorocarbon resin, organic silicon resin, Polyimide (PI) and the like.
In another embodiment of the present invention, the infrared absorption material layer 30 formed in step S1 is tin dioxide nanoparticles, and the step of forming the infrared absorption material layer in step S1 is: after the base plate is pretreated by oil removal and dust removal, a layer of self-drying black paint is coated, and then blue nano tungsten oxide particles are plated on the substrate 10 under vacuum to form a near-infrared absorption film layer, wherein the thickness of the whole infrared absorption material layer is less than 1 mu m.
In the embodiment of the present invention, if the substrate 10 is a mixed substrate doped with a dye therein, the step of forming a dye layer on the outer side or the inner side of the mixed substrate is not required, and if the substrate 10 is a transparent material, the step S1 further includes a step of coating the dye layer 70 on the side of the substrate 10 facing the inside or the outside, for example, a step of coating the black light absorbing dye layer 70 on the side of the substrate 10 away from the first conductive layer 20 and the ir absorbing material layer 30, or a step of coating the black light absorbing dye layer 70 on the side of the substrate 10 close to the first conductive layer 20 and the ir absorbing material layer 30, where the positional relationship among the first conductive layer 20, the ir absorbing material layer 30, and the dye layer 70 is not limited and can be determined according to the actual manufacturing process.
In the embodiment of the present invention, the liquid crystal layer 40 dropped in step S3 is a liquid crystal mixture, and the preparation steps are as follows: weighing certain mass of nematic liquid crystal, adding chiral agents with different twisting abilities, heating and stirring to uniformly mix, cooling to room temperature to form cholesteric liquid crystal reflecting visible light, wherein the chiral agents account for 0.1-40 wt% of the total mass of the cholesteric liquid crystal. Adding UV curing glue into the cholesteric liquid crystal, stirring and dispersing to obtain uniform and transparent liquid, wherein the glue accounts for 5-30 wt% of the total mass of the mixed liquid. The dropping of the liquid crystal layer 40 in the step S3 can be performed by various methods and processes of dropping liquid crystal, for example, by using a liquid crystal dropping machine or by using a conventional dropper or other dropping equipment.
In an embodiment of the present invention, the stitching step in step S4 includes: the rubber roller is used for rolling from one end of the dropping liquid to the other end, the thickness of the box is controlled through the spacer, but the step is not limited to the step, and the step can be realized by adopting a special pressing machine table, so that the production efficiency is improved.
The method for erasing the local part of the handwriting board comprises the following steps: and opening a control switch of the erasing pen to enable the erasing pen to emit infrared light, and irradiating the infrared light to the area of the liquid crystal handwriting board needing local erasing to perform local erasing. Preferably, the infrared light emitted by the erasing pen is near infrared light with the wavelength in the range of 780nm-2500 nm.
The invention is thermal erasing in principle, and can convert light energy into heat energy by means of photo-thermal conversion of special materials, so that the liquid crystal material generates phase conversion, and the erasing purpose is further realized. The photothermal conversion belongs to non-contact energy transfer, and has high transmission efficiency and fast time, and avoids the damage of semiconductor heating to the substrate.
The local erasing handwriting board device provided by the invention realizes local erasing by adopting non-contact photo-thermal conversion, and has the advantages of high erasing efficiency, convenience in use, energy conservation and low cost.
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 (11)
1. The device for locally erasing the liquid crystal writing pad is characterized by comprising the liquid crystal writing pad and an erasing pen, wherein the liquid crystal writing pad comprises:
a substrate;
a first conductive layer and a layer of infrared absorbing material, the first conductive layer and the layer of infrared absorbing material being substantially uniformly sized on the substrate;
a liquid crystal layer;
a second conductive layer;
a flexible transparent substrate;
the first conducting layer and the second conducting layer are transparent conducting layers, the second conducting layer is formed on the flexible transparent base material, the substrate and the flexible transparent base material jointly clamp the liquid crystal layer to form a liquid crystal box of the liquid crystal handwriting board, and the erasing pen comprises an infrared emission light source and a control switch;
wherein the infrared absorbing material layer is patterned.
2. The device of claim 1, wherein the first conductive layer is disposed between the substrate and the layer of infrared absorbing material.
3. The device of claim 1, wherein the layer of infrared absorbing material is disposed between the substrate and the first conductive layer.
4. The device of claim 2 or 3, wherein the first and second conductive layers are each selected from at least one of an ITO layer, a nano-silver wire layer, and a graphene layer.
5. The device of claim 1, further comprising a dye layer disposed on a side of the substrate facing away from the first conductive layer, wherein the dye layer is coated on the substrate or attached to the substrate, and the color of the dye layer is changeable.
6. The device of claim 1, wherein the substrate is a dye-loaded glass, PET, resin, or the like.
7. The device of claim 1, wherein the erasing pen is integrated with a writing pen of the liquid crystal writing pad.
8. A method for forming a device for partially erasing a liquid crystal writing pad is characterized in that the device for partially erasing the liquid crystal writing pad comprises a liquid crystal writing pad and an erasing pen, and the method for forming the liquid crystal writing pad comprises the following steps:
s1, providing a substrate, and sequentially forming a first conductive layer and an infrared absorption material layer on the substrate, or sequentially forming an infrared absorption material layer and a first conductive layer on the substrate, wherein the infrared absorption material layer is patterned;
s2, providing a flexible transparent substrate, and forming a second conducting layer on the flexible transparent substrate;
s3, dropping a liquid crystal layer on the side of the substrate having the first conductive layer and the infrared absorption material layer after the step S1;
s4, pressing the side of the flexible transparent substrate with the second conductive layer after the step S2 on the liquid crystal layer;
s5, curing by ultraviolet irradiation after laminating to form a liquid crystal box of the liquid crystal handwriting board;
and S6, driving the first conducting layer and the second conducting layer to a plane state by a high electric field, and then switching to a scattering state by a low-voltage electric field for writing.
9. The method of claim 8, wherein the infrared absorption material layer formed in step S1 is organic dye, inorganic metal fine particles or semiconductor nanoparticles.
10. The method of claim 8, wherein the step of locally erasing comprises: and opening a control switch of the erasing pen to enable the erasing pen to emit infrared light, and irradiating the infrared light to the area of the liquid crystal handwriting board needing local erasing to perform local erasing.
11. The method as claimed in claim 10, wherein the erasing pen emits infrared light with a wavelength in the range of 780nm-2500 nm.
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| CN112462544B (en) * | 2020-12-01 | 2023-02-28 | 中国科学院宁波材料技术与工程研究所 | Locally erasable liquid crystal handwriting board and using method thereof |
| CN113391493A (en) * | 2021-07-07 | 2021-09-14 | 南京邮电大学 | Wide-viewing-angle bistable liquid crystal erasable display device and display method thereof |
| CN114822436B (en) * | 2022-04-13 | 2023-12-08 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device with photoelectric detection function and method |
| CN115268146A (en) * | 2022-07-06 | 2022-11-01 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device based on high-temperature-resistant hard substrate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56101278A (en) * | 1980-01-17 | 1981-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Input and output display unit of flat plate graph |
| CN103246096A (en) * | 2012-02-13 | 2013-08-14 | 江苏和成显示科技股份有限公司 | Bistable liquid crystal handwriting device |
| CN105954903A (en) * | 2016-07-20 | 2016-09-21 | 京东方科技集团股份有限公司 | Liquid crystal display panel and display method and display assembly thereof |
| CN106646977A (en) * | 2017-01-13 | 2017-05-10 | 深圳市好写科技有限公司 | Local-erasing liquid-crystal display device |
| CN107066153A (en) * | 2017-04-21 | 2017-08-18 | 深圳市屏柔科技有限公司 | A kind of intelligent flexible liquid crystal blackboard that key erasing and selective erase can be achieved |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6432518B1 (en) * | 1998-12-28 | 2002-08-13 | Ricoh Company, Ltd. | Erasable recording material capable of inputting additional information written thereon and information recording system and information recording method using the recording material |
-
2017
- 2017-12-15 CN CN201711349246.XA patent/CN109932834B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56101278A (en) * | 1980-01-17 | 1981-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Input and output display unit of flat plate graph |
| CN103246096A (en) * | 2012-02-13 | 2013-08-14 | 江苏和成显示科技股份有限公司 | Bistable liquid crystal handwriting device |
| CN105954903A (en) * | 2016-07-20 | 2016-09-21 | 京东方科技集团股份有限公司 | Liquid crystal display panel and display method and display assembly thereof |
| CN106646977A (en) * | 2017-01-13 | 2017-05-10 | 深圳市好写科技有限公司 | Local-erasing liquid-crystal display device |
| CN107066153A (en) * | 2017-04-21 | 2017-08-18 | 深圳市屏柔科技有限公司 | A kind of intelligent flexible liquid crystal blackboard that key erasing and selective erase can be achieved |
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